chore: 添加虚拟环境到仓库

- 添加 backend_service/venv 虚拟环境
- 包含所有Python依赖包
- 注意：虚拟环境约393MB，包含12655个文件

backend_service/venv/lib/python3.13/site-packages/fsspec/__init__.py

@@ -0,0 +1,71 @@
+from . import caching
+from ._version import __version__  # noqa: F401
+from .callbacks import Callback
+from .compression import available_compressions
+from .core import get_fs_token_paths, open, open_files, open_local, url_to_fs
+from .exceptions import FSTimeoutError
+from .mapping import FSMap, get_mapper
+from .registry import (
+    available_protocols,
+    filesystem,
+    get_filesystem_class,
+    register_implementation,
+    registry,
+)
+from .spec import AbstractFileSystem
+
+__all__ = [
+    "AbstractFileSystem",
+    "FSTimeoutError",
+    "FSMap",
+    "filesystem",
+    "register_implementation",
+    "get_filesystem_class",
+    "get_fs_token_paths",
+    "get_mapper",
+    "open",
+    "open_files",
+    "open_local",
+    "registry",
+    "caching",
+    "Callback",
+    "available_protocols",
+    "available_compressions",
+    "url_to_fs",
+]
+
+
+def process_entries():
+    try:
+        from importlib.metadata import entry_points
+    except ImportError:
+        return
+    if entry_points is not None:
+        try:
+            eps = entry_points()
+        except TypeError:
+            pass  # importlib-metadata < 0.8
+        else:
+            if hasattr(eps, "select"):  # Python 3.10+ / importlib_metadata >= 3.9.0
+                specs = eps.select(group="fsspec.specs")
+            else:
+                specs = eps.get("fsspec.specs", [])
+            registered_names = {}
+            for spec in specs:
+                err_msg = f"Unable to load filesystem from {spec}"
+                name = spec.name
+                if name in registered_names:
+                    continue
+                registered_names[name] = True
+                register_implementation(
+                    name,
+                    spec.value.replace(":", "."),
+                    errtxt=err_msg,
+                    # We take our implementations as the ones to overload with if
+                    # for some reason we encounter some, may be the same, already
+                    # registered
+                    clobber=True,
+                )
+
+
+process_entries()

backend_service/venv/lib/python3.13/site-packages/fsspec/_version.py

@@ -0,0 +1,34 @@
+# file generated by setuptools-scm
+# don't change, don't track in version control
+
+__all__ = [
+    "__version__",
+    "__version_tuple__",
+    "version",
+    "version_tuple",
+    "__commit_id__",
+    "commit_id",
+]
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Tuple
+    from typing import Union
+
+    VERSION_TUPLE = Tuple[Union[int, str], ...]
+    COMMIT_ID = Union[str, None]
+else:
+    VERSION_TUPLE = object
+    COMMIT_ID = object
+
+version: str
+__version__: str
+__version_tuple__: VERSION_TUPLE
+version_tuple: VERSION_TUPLE
+commit_id: COMMIT_ID
+__commit_id__: COMMIT_ID
+
+__version__ = version = '2025.10.0'
+__version_tuple__ = version_tuple = (2025, 10, 0)
+
+__commit_id__ = commit_id = None

backend_service/venv/lib/python3.13/site-packages/fsspec/archive.py

@@ -0,0 +1,75 @@
+import operator
+
+from fsspec import AbstractFileSystem
+from fsspec.utils import tokenize
+
+
+class AbstractArchiveFileSystem(AbstractFileSystem):
+    """
+    A generic superclass for implementing Archive-based filesystems.
+
+    Currently, it is shared amongst
+    :class:`~fsspec.implementations.zip.ZipFileSystem`,
+    :class:`~fsspec.implementations.libarchive.LibArchiveFileSystem` and
+    :class:`~fsspec.implementations.tar.TarFileSystem`.
+    """
+
+    def __str__(self):
+        return f"<Archive-like object {type(self).__name__} at {id(self)}>"
+
+    __repr__ = __str__
+
+    def ukey(self, path):
+        return tokenize(path, self.fo, self.protocol)
+
+    def _all_dirnames(self, paths):
+        """Returns *all* directory names for each path in paths, including intermediate
+        ones.
+
+        Parameters
+        ----------
+        paths: Iterable of path strings
+        """
+        if len(paths) == 0:
+            return set()
+
+        dirnames = {self._parent(path) for path in paths} - {self.root_marker}
+        return dirnames | self._all_dirnames(dirnames)
+
+    def info(self, path, **kwargs):
+        self._get_dirs()
+        path = self._strip_protocol(path)
+        if path in {"", "/"} and self.dir_cache:
+            return {"name": "", "type": "directory", "size": 0}
+        if path in self.dir_cache:
+            return self.dir_cache[path]
+        elif path + "/" in self.dir_cache:
+            return self.dir_cache[path + "/"]
+        else:
+            raise FileNotFoundError(path)
+
+    def ls(self, path, detail=True, **kwargs):
+        self._get_dirs()
+        paths = {}
+        for p, f in self.dir_cache.items():
+            p = p.rstrip("/")
+            if "/" in p:
+                root = p.rsplit("/", 1)[0]
+            else:
+                root = ""
+            if root == path.rstrip("/"):
+                paths[p] = f
+            elif all(
+                (a == b)
+                for a, b in zip(path.split("/"), [""] + p.strip("/").split("/"))
+            ):
+                # root directory entry
+                ppath = p.rstrip("/").split("/", 1)[0]
+                if ppath not in paths:
+                    out = {"name": ppath, "size": 0, "type": "directory"}
+                    paths[ppath] = out
+        if detail:
+            out = sorted(paths.values(), key=operator.itemgetter("name"))
+            return out
+        else:
+            return sorted(paths)

backend_service/venv/lib/python3.13/site-packages/fsspec/callbacks.py

@@ -0,0 +1,324 @@
+from functools import wraps
+
+
+class Callback:
+    """
+    Base class and interface for callback mechanism
+
+    This class can be used directly for monitoring file transfers by
+    providing ``callback=Callback(hooks=...)`` (see the ``hooks`` argument,
+    below), or subclassed for more specialised behaviour.
+
+    Parameters
+    ----------
+    size: int (optional)
+        Nominal quantity for the value that corresponds to a complete
+        transfer, e.g., total number of tiles or total number of
+        bytes
+    value: int (0)
+        Starting internal counter value
+    hooks: dict or None
+        A dict of named functions to be called on each update. The signature
+        of these must be ``f(size, value, **kwargs)``
+    """
+
+    def __init__(self, size=None, value=0, hooks=None, **kwargs):
+        self.size = size
+        self.value = value
+        self.hooks = hooks or {}
+        self.kw = kwargs
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *exc_args):
+        self.close()
+
+    def close(self):
+        """Close callback."""
+
+    def branched(self, path_1, path_2, **kwargs):
+        """
+        Return callback for child transfers
+
+        If this callback is operating at a higher level, e.g., put, which may
+        trigger transfers that can also be monitored. The function returns a callback
+        that has to be passed to the child method, e.g., put_file,
+        as `callback=` argument.
+
+        The implementation uses `callback.branch` for compatibility.
+        When implementing callbacks, it is recommended to override this function instead
+        of `branch` and avoid calling `super().branched(...)`.
+
+        Prefer using this function over `branch`.
+
+        Parameters
+        ----------
+        path_1: str
+            Child's source path
+        path_2: str
+            Child's destination path
+        **kwargs:
+            Arbitrary keyword arguments
+
+        Returns
+        -------
+        callback: Callback
+            A callback instance to be passed to the child method
+        """
+        self.branch(path_1, path_2, kwargs)
+        # mutate kwargs so that we can force the caller to pass "callback=" explicitly
+        return kwargs.pop("callback", DEFAULT_CALLBACK)
+
+    def branch_coro(self, fn):
+        """
+        Wraps a coroutine, and pass a new child callback to it.
+        """
+
+        @wraps(fn)
+        async def func(path1, path2: str, **kwargs):
+            with self.branched(path1, path2, **kwargs) as child:
+                return await fn(path1, path2, callback=child, **kwargs)
+
+        return func
+
+    def set_size(self, size):
+        """
+        Set the internal maximum size attribute
+
+        Usually called if not initially set at instantiation. Note that this
+        triggers a ``call()``.
+
+        Parameters
+        ----------
+        size: int
+        """
+        self.size = size
+        self.call()
+
+    def absolute_update(self, value):
+        """
+        Set the internal value state
+
+        Triggers ``call()``
+
+        Parameters
+        ----------
+        value: int
+        """
+        self.value = value
+        self.call()
+
+    def relative_update(self, inc=1):
+        """
+        Delta increment the internal counter
+
+        Triggers ``call()``
+
+        Parameters
+        ----------
+        inc: int
+        """
+        self.value += inc
+        self.call()
+
+    def call(self, hook_name=None, **kwargs):
+        """
+        Execute hook(s) with current state
+
+        Each function is passed the internal size and current value
+
+        Parameters
+        ----------
+        hook_name: str or None
+            If given, execute on this hook
+        kwargs: passed on to (all) hook(s)
+        """
+        if not self.hooks:
+            return
+        kw = self.kw.copy()
+        kw.update(kwargs)
+        if hook_name:
+            if hook_name not in self.hooks:
+                return
+            return self.hooks[hook_name](self.size, self.value, **kw)
+        for hook in self.hooks.values() or []:
+            hook(self.size, self.value, **kw)
+
+    def wrap(self, iterable):
+        """
+        Wrap an iterable to call ``relative_update`` on each iterations
+
+        Parameters
+        ----------
+        iterable: Iterable
+            The iterable that is being wrapped
+        """
+        for item in iterable:
+            self.relative_update()
+            yield item
+
+    def branch(self, path_1, path_2, kwargs):
+        """
+        Set callbacks for child transfers
+
+        If this callback is operating at a higher level, e.g., put, which may
+        trigger transfers that can also be monitored. The passed kwargs are
+        to be *mutated* to add ``callback=``, if this class supports branching
+        to children.
+
+        Parameters
+        ----------
+        path_1: str
+            Child's source path
+        path_2: str
+            Child's destination path
+        kwargs: dict
+            arguments passed to child method, e.g., put_file.
+
+        Returns
+        -------
+
+        """
+        return None
+
+    def no_op(self, *_, **__):
+        pass
+
+    def __getattr__(self, item):
+        """
+        If undefined methods are called on this class, nothing happens
+        """
+        return self.no_op
+
+    @classmethod
+    def as_callback(cls, maybe_callback=None):
+        """Transform callback=... into Callback instance
+
+        For the special value of ``None``, return the global instance of
+        ``NoOpCallback``. This is an alternative to including
+        ``callback=DEFAULT_CALLBACK`` directly in a method signature.
+        """
+        if maybe_callback is None:
+            return DEFAULT_CALLBACK
+        return maybe_callback
+
+
+class NoOpCallback(Callback):
+    """
+    This implementation of Callback does exactly nothing
+    """
+
+    def call(self, *args, **kwargs):
+        return None
+
+
+class DotPrinterCallback(Callback):
+    """
+    Simple example Callback implementation
+
+    Almost identical to Callback with a hook that prints a char; here we
+    demonstrate how the outer layer may print "#" and the inner layer "."
+    """
+
+    def __init__(self, chr_to_print="#", **kwargs):
+        self.chr = chr_to_print
+        super().__init__(**kwargs)
+
+    def branch(self, path_1, path_2, kwargs):
+        """Mutate kwargs to add new instance with different print char"""
+        kwargs["callback"] = DotPrinterCallback(".")
+
+    def call(self, **kwargs):
+        """Just outputs a character"""
+        print(self.chr, end="")
+
+
+class TqdmCallback(Callback):
+    """
+    A callback to display a progress bar using tqdm
+
+    Parameters
+    ----------
+    tqdm_kwargs : dict, (optional)
+        Any argument accepted by the tqdm constructor.
+        See the `tqdm doc <https://tqdm.github.io/docs/tqdm/#__init__>`_.
+        Will be forwarded to `tqdm_cls`.
+    tqdm_cls: (optional)
+        subclass of `tqdm.tqdm`. If not passed, it will default to `tqdm.tqdm`.
+
+    Examples
+    --------
+    >>> import fsspec
+    >>> from fsspec.callbacks import TqdmCallback
+    >>> fs = fsspec.filesystem("memory")
+    >>> path2distant_data = "/your-path"
+    >>> fs.upload(
+            ".",
+            path2distant_data,
+            recursive=True,
+            callback=TqdmCallback(),
+        )
+
+    You can forward args to tqdm using the ``tqdm_kwargs`` parameter.
+
+    >>> fs.upload(
+            ".",
+            path2distant_data,
+            recursive=True,
+            callback=TqdmCallback(tqdm_kwargs={"desc": "Your tqdm description"}),
+        )
+
+    You can also customize the progress bar by passing a subclass of `tqdm`.
+
+    .. code-block:: python
+
+        class TqdmFormat(tqdm):
+            '''Provides a `total_time` format parameter'''
+            @property
+            def format_dict(self):
+                d = super().format_dict
+                total_time = d["elapsed"] * (d["total"] or 0) / max(d["n"], 1)
+                d.update(total_time=self.format_interval(total_time) + " in total")
+                return d
+
+    >>> with TqdmCallback(
+            tqdm_kwargs={
+                "desc": "desc",
+                "bar_format": "{total_time}: {percentage:.0f}%|{bar}{r_bar}",
+            },
+            tqdm_cls=TqdmFormat,
+        ) as callback:
+            fs.upload(".", path2distant_data, recursive=True, callback=callback)
+    """
+
+    def __init__(self, tqdm_kwargs=None, *args, **kwargs):
+        try:
+            from tqdm import tqdm
+
+        except ImportError as exce:
+            raise ImportError(
+                "Using TqdmCallback requires tqdm to be installed"
+            ) from exce
+
+        self._tqdm_cls = kwargs.pop("tqdm_cls", tqdm)
+        self._tqdm_kwargs = tqdm_kwargs or {}
+        self.tqdm = None
+        super().__init__(*args, **kwargs)
+
+    def call(self, *args, **kwargs):
+        if self.tqdm is None:
+            self.tqdm = self._tqdm_cls(total=self.size, **self._tqdm_kwargs)
+        self.tqdm.total = self.size
+        self.tqdm.update(self.value - self.tqdm.n)
+
+    def close(self):
+        if self.tqdm is not None:
+            self.tqdm.close()
+            self.tqdm = None
+
+    def __del__(self):
+        return self.close()
+
+
+DEFAULT_CALLBACK = _DEFAULT_CALLBACK = NoOpCallback()

backend_service/venv/lib/python3.13/site-packages/fsspec/compression.py

@@ -0,0 +1,182 @@
+"""Helper functions for a standard streaming compression API"""
+
+from zipfile import ZipFile
+
+import fsspec.utils
+from fsspec.spec import AbstractBufferedFile
+
+
+def noop_file(file, mode, **kwargs):
+    return file
+
+
+# TODO: files should also be available as contexts
+# should be functions of the form func(infile, mode=, **kwargs) -> file-like
+compr = {None: noop_file}
+
+
+def register_compression(name, callback, extensions, force=False):
+    """Register an "inferable" file compression type.
+
+    Registers transparent file compression type for use with fsspec.open.
+    Compression can be specified by name in open, or "infer"-ed for any files
+    ending with the given extensions.
+
+    Args:
+        name: (str) The compression type name. Eg. "gzip".
+        callback: A callable of form (infile, mode, **kwargs) -> file-like.
+            Accepts an input file-like object, the target mode and kwargs.
+            Returns a wrapped file-like object.
+        extensions: (str, Iterable[str]) A file extension, or list of file
+            extensions for which to infer this compression scheme. Eg. "gz".
+        force: (bool) Force re-registration of compression type or extensions.
+
+    Raises:
+        ValueError: If name or extensions already registered, and not force.
+
+    """
+    if isinstance(extensions, str):
+        extensions = [extensions]
+
+    # Validate registration
+    if name in compr and not force:
+        raise ValueError(f"Duplicate compression registration: {name}")
+
+    for ext in extensions:
+        if ext in fsspec.utils.compressions and not force:
+            raise ValueError(f"Duplicate compression file extension: {ext} ({name})")
+
+    compr[name] = callback
+
+    for ext in extensions:
+        fsspec.utils.compressions[ext] = name
+
+
+def unzip(infile, mode="rb", filename=None, **kwargs):
+    if "r" not in mode:
+        filename = filename or "file"
+        z = ZipFile(infile, mode="w", **kwargs)
+        fo = z.open(filename, mode="w")
+        fo.close = lambda closer=fo.close: closer() or z.close()
+        return fo
+    z = ZipFile(infile)
+    if filename is None:
+        filename = z.namelist()[0]
+    return z.open(filename, mode="r", **kwargs)
+
+
+register_compression("zip", unzip, "zip")
+
+try:
+    from bz2 import BZ2File
+except ImportError:
+    pass
+else:
+    register_compression("bz2", BZ2File, "bz2")
+
+try:  # pragma: no cover
+    from isal import igzip
+
+    def isal(infile, mode="rb", **kwargs):
+        return igzip.IGzipFile(fileobj=infile, mode=mode, **kwargs)
+
+    register_compression("gzip", isal, "gz")
+except ImportError:
+    from gzip import GzipFile
+
+    register_compression(
+        "gzip", lambda f, **kwargs: GzipFile(fileobj=f, **kwargs), "gz"
+    )
+
+try:
+    from lzma import LZMAFile
+
+    register_compression("lzma", LZMAFile, "lzma")
+    register_compression("xz", LZMAFile, "xz")
+except ImportError:
+    pass
+
+try:
+    import lzmaffi
+
+    register_compression("lzma", lzmaffi.LZMAFile, "lzma", force=True)
+    register_compression("xz", lzmaffi.LZMAFile, "xz", force=True)
+except ImportError:
+    pass
+
+
+class SnappyFile(AbstractBufferedFile):
+    def __init__(self, infile, mode, **kwargs):
+        import snappy
+
+        super().__init__(
+            fs=None, path="snappy", mode=mode.strip("b") + "b", size=999999999, **kwargs
+        )
+        self.infile = infile
+        if "r" in mode:
+            self.codec = snappy.StreamDecompressor()
+        else:
+            self.codec = snappy.StreamCompressor()
+
+    def _upload_chunk(self, final=False):
+        self.buffer.seek(0)
+        out = self.codec.add_chunk(self.buffer.read())
+        self.infile.write(out)
+        return True
+
+    def seek(self, loc, whence=0):
+        raise NotImplementedError("SnappyFile is not seekable")
+
+    def seekable(self):
+        return False
+
+    def _fetch_range(self, start, end):
+        """Get the specified set of bytes from remote"""
+        data = self.infile.read(end - start)
+        return self.codec.decompress(data)
+
+
+try:
+    import snappy
+
+    snappy.compress(b"")
+    # Snappy may use the .sz file extension, but this is not part of the
+    # standard implementation.
+    register_compression("snappy", SnappyFile, [])
+
+except (ImportError, NameError, AttributeError):
+    pass
+
+try:
+    import lz4.frame
+
+    register_compression("lz4", lz4.frame.open, "lz4")
+except ImportError:
+    pass
+
+try:
+    # zstd in the standard library for python >= 3.14
+    from compression.zstd import ZstdFile
+
+    register_compression("zstd", ZstdFile, "zst")
+
+except ImportError:
+    try:
+        import zstandard as zstd
+
+        def zstandard_file(infile, mode="rb"):
+            if "r" in mode:
+                cctx = zstd.ZstdDecompressor()
+                return cctx.stream_reader(infile)
+            else:
+                cctx = zstd.ZstdCompressor(level=10)
+                return cctx.stream_writer(infile)
+
+        register_compression("zstd", zstandard_file, "zst")
+    except ImportError:
+        pass
+
+
+def available_compressions():
+    """Return a list of the implemented compressions."""
+    return list(compr)

backend_service/venv/lib/python3.13/site-packages/fsspec/config.py

@@ -0,0 +1,131 @@
+from __future__ import annotations
+
+import configparser
+import json
+import os
+import warnings
+from typing import Any
+
+conf: dict[str, dict[str, Any]] = {}
+default_conf_dir = os.path.join(os.path.expanduser("~"), ".config/fsspec")
+conf_dir = os.environ.get("FSSPEC_CONFIG_DIR", default_conf_dir)
+
+
+def set_conf_env(conf_dict, envdict=os.environ):
+    """Set config values from environment variables
+
+    Looks for variables of the form ``FSSPEC_<protocol>`` and
+    ``FSSPEC_<protocol>_<kwarg>``. For ``FSSPEC_<protocol>`` the value is parsed
+    as a json dictionary and used to ``update`` the config of the
+    corresponding protocol. For ``FSSPEC_<protocol>_<kwarg>`` there is no
+    attempt to convert the string value, but the kwarg keys will be lower-cased.
+
+    The ``FSSPEC_<protocol>_<kwarg>`` variables are applied after the
+    ``FSSPEC_<protocol>`` ones.
+
+    Parameters
+    ----------
+    conf_dict : dict(str, dict)
+        This dict will be mutated
+    envdict : dict-like(str, str)
+        Source for the values - usually the real environment
+    """
+    kwarg_keys = []
+    for key in envdict:
+        if key.startswith("FSSPEC_") and len(key) > 7 and key[7] != "_":
+            if key.count("_") > 1:
+                kwarg_keys.append(key)
+                continue
+            try:
+                value = json.loads(envdict[key])
+            except json.decoder.JSONDecodeError as ex:
+                warnings.warn(
+                    f"Ignoring environment variable {key} due to a parse failure: {ex}"
+                )
+            else:
+                if isinstance(value, dict):
+                    _, proto = key.split("_", 1)
+                    conf_dict.setdefault(proto.lower(), {}).update(value)
+                else:
+                    warnings.warn(
+                        f"Ignoring environment variable {key} due to not being a dict:"
+                        f" {type(value)}"
+                    )
+        elif key.startswith("FSSPEC"):
+            warnings.warn(
+                f"Ignoring environment variable {key} due to having an unexpected name"
+            )
+
+    for key in kwarg_keys:
+        _, proto, kwarg = key.split("_", 2)
+        conf_dict.setdefault(proto.lower(), {})[kwarg.lower()] = envdict[key]
+
+
+def set_conf_files(cdir, conf_dict):
+    """Set config values from files
+
+    Scans for INI and JSON files in the given dictionary, and uses their
+    contents to set the config. In case of repeated values, later values
+    win.
+
+    In the case of INI files, all values are strings, and these will not
+    be converted.
+
+    Parameters
+    ----------
+    cdir : str
+        Directory to search
+    conf_dict : dict(str, dict)
+        This dict will be mutated
+    """
+    if not os.path.isdir(cdir):
+        return
+    allfiles = sorted(os.listdir(cdir))
+    for fn in allfiles:
+        if fn.endswith(".ini"):
+            ini = configparser.ConfigParser()
+            ini.read(os.path.join(cdir, fn))
+            for key in ini:
+                if key == "DEFAULT":
+                    continue
+                conf_dict.setdefault(key, {}).update(dict(ini[key]))
+        if fn.endswith(".json"):
+            with open(os.path.join(cdir, fn)) as f:
+                js = json.load(f)
+            for key in js:
+                conf_dict.setdefault(key, {}).update(dict(js[key]))
+
+
+def apply_config(cls, kwargs, conf_dict=None):
+    """Supply default values for kwargs when instantiating class
+
+    Augments the passed kwargs, by finding entries in the config dict
+    which match the classes ``.protocol`` attribute (one or more str)
+
+    Parameters
+    ----------
+    cls : file system implementation
+    kwargs : dict
+    conf_dict : dict of dict
+        Typically this is the global configuration
+
+    Returns
+    -------
+    dict : the modified set of kwargs
+    """
+    if conf_dict is None:
+        conf_dict = conf
+    protos = cls.protocol if isinstance(cls.protocol, (tuple, list)) else [cls.protocol]
+    kw = {}
+    for proto in protos:
+        # default kwargs from the current state of the config
+        if proto in conf_dict:
+            kw.update(conf_dict[proto])
+    # explicit kwargs always win
+    kw.update(**kwargs)
+    kwargs = kw
+    return kwargs
+
+
+set_conf_files(conf_dir, conf)
+set_conf_env(conf)

backend_service/venv/lib/python3.13/site-packages/fsspec/conftest.py

@@ -0,0 +1,125 @@
+import os
+import shutil
+import subprocess
+import sys
+import time
+from collections import deque
+from collections.abc import Generator, Sequence
+
+import pytest
+
+import fsspec
+
+
+@pytest.fixture()
+def m():
+    """
+    Fixture providing a memory filesystem.
+    """
+    m = fsspec.filesystem("memory")
+    m.store.clear()
+    m.pseudo_dirs.clear()
+    m.pseudo_dirs.append("")
+    try:
+        yield m
+    finally:
+        m.store.clear()
+        m.pseudo_dirs.clear()
+        m.pseudo_dirs.append("")
+
+
+class InstanceCacheInspector:
+    """
+    Helper class to inspect instance caches of filesystem classes in tests.
+    """
+
+    def clear(self) -> None:
+        """
+        Clear instance caches of all currently imported filesystem classes.
+        """
+        classes = deque([fsspec.spec.AbstractFileSystem])
+        while classes:
+            cls = classes.popleft()
+            cls.clear_instance_cache()
+            classes.extend(cls.__subclasses__())
+
+    def gather_counts(self, *, omit_zero: bool = True) -> dict[str, int]:
+        """
+        Gather counts of filesystem instances in the instance caches
+        of all currently imported filesystem classes.
+
+        Parameters
+        ----------
+        omit_zero:
+            Whether to omit instance types with no cached instances.
+        """
+        out: dict[str, int] = {}
+        classes = deque([fsspec.spec.AbstractFileSystem])
+        while classes:
+            cls = classes.popleft()
+            count = len(cls._cache)  # there is no public interface for the cache
+            # note: skip intermediate AbstractFileSystem subclasses
+            #   if they proxy the protocol attribute via a property.
+            if isinstance(cls.protocol, (Sequence, str)):
+                key = cls.protocol if isinstance(cls.protocol, str) else cls.protocol[0]
+                if count or not omit_zero:
+                    out[key] = count
+            classes.extend(cls.__subclasses__())
+        return out
+
+
+@pytest.fixture(scope="function", autouse=True)
+def instance_caches() -> Generator[InstanceCacheInspector, None, None]:
+    """
+    Fixture to ensure empty filesystem instance caches before and after a test.
+
+    Used by default for all tests.
+    Clears caches of all imported filesystem classes.
+    Can be used to write test assertions about instance caches.
+
+    Usage:
+
+        def test_something(instance_caches):
+            # Test code here
+            fsspec.open("file://abc")
+            fsspec.open("memory://foo/bar")
+
+            # Test assertion
+            assert instance_caches.gather_counts() == {"file": 1, "memory": 1}
+
+    Returns
+    -------
+    instance_caches: An instance cache inspector for clearing and inspecting caches.
+    """
+    ic = InstanceCacheInspector()
+
+    ic.clear()
+    try:
+        yield ic
+    finally:
+        ic.clear()
+
+
+@pytest.fixture(scope="function")
+def ftp_writable(tmpdir):
+    """
+    Fixture providing a writable FTP filesystem.
+    """
+    pytest.importorskip("pyftpdlib")
+
+    d = str(tmpdir)
+    with open(os.path.join(d, "out"), "wb") as f:
+        f.write(b"hello" * 10000)
+    P = subprocess.Popen(
+        [sys.executable, "-m", "pyftpdlib", "-d", d, "-u", "user", "-P", "pass", "-w"]
+    )
+    try:
+        time.sleep(1)
+        yield "localhost", 2121, "user", "pass"
+    finally:
+        P.terminate()
+        P.wait()
+        try:
+            shutil.rmtree(tmpdir)
+        except Exception:
+            pass

backend_service/venv/lib/python3.13/site-packages/fsspec/core.py

@@ -0,0 +1,743 @@
+from __future__ import annotations
+
+import io
+import logging
+import os
+import re
+from glob import has_magic
+from pathlib import Path
+
+# for backwards compat, we export cache things from here too
+from fsspec.caching import (  # noqa: F401
+    BaseCache,
+    BlockCache,
+    BytesCache,
+    MMapCache,
+    ReadAheadCache,
+    caches,
+)
+from fsspec.compression import compr
+from fsspec.config import conf
+from fsspec.registry import filesystem, get_filesystem_class
+from fsspec.utils import (
+    _unstrip_protocol,
+    build_name_function,
+    infer_compression,
+    stringify_path,
+)
+
+logger = logging.getLogger("fsspec")
+
+
+class OpenFile:
+    """
+    File-like object to be used in a context
+
+    Can layer (buffered) text-mode and compression over any file-system, which
+    are typically binary-only.
+
+    These instances are safe to serialize, as the low-level file object
+    is not created until invoked using ``with``.
+
+    Parameters
+    ----------
+    fs: FileSystem
+        The file system to use for opening the file. Should be a subclass or duck-type
+        with ``fsspec.spec.AbstractFileSystem``
+    path: str
+        Location to open
+    mode: str like 'rb', optional
+        Mode of the opened file
+    compression: str or None, optional
+        Compression to apply
+    encoding: str or None, optional
+        The encoding to use if opened in text mode.
+    errors: str or None, optional
+        How to handle encoding errors if opened in text mode.
+    newline: None or str
+        Passed to TextIOWrapper in text mode, how to handle line endings.
+    autoopen: bool
+        If True, calls open() immediately. Mostly used by pickle
+    pos: int
+        If given and autoopen is True, seek to this location immediately
+    """
+
+    def __init__(
+        self,
+        fs,
+        path,
+        mode="rb",
+        compression=None,
+        encoding=None,
+        errors=None,
+        newline=None,
+    ):
+        self.fs = fs
+        self.path = path
+        self.mode = mode
+        self.compression = get_compression(path, compression)
+        self.encoding = encoding
+        self.errors = errors
+        self.newline = newline
+        self.fobjects = []
+
+    def __reduce__(self):
+        return (
+            OpenFile,
+            (
+                self.fs,
+                self.path,
+                self.mode,
+                self.compression,
+                self.encoding,
+                self.errors,
+                self.newline,
+            ),
+        )
+
+    def __repr__(self):
+        return f"<OpenFile '{self.path}'>"
+
+    def __enter__(self):
+        mode = self.mode.replace("t", "").replace("b", "") + "b"
+
+        try:
+            f = self.fs.open(self.path, mode=mode)
+        except FileNotFoundError as e:
+            if has_magic(self.path):
+                raise FileNotFoundError(
+                    "%s not found. The URL contains glob characters: you maybe needed\n"
+                    "to pass expand=True in fsspec.open() or the storage_options of \n"
+                    "your library. You can also set the config value 'open_expand'\n"
+                    "before import, or fsspec.core.DEFAULT_EXPAND at runtime, to True.",
+                    self.path,
+                ) from e
+            raise
+
+        self.fobjects = [f]
+
+        if self.compression is not None:
+            compress = compr[self.compression]
+            f = compress(f, mode=mode[0])
+            self.fobjects.append(f)
+
+        if "b" not in self.mode:
+            # assume, for example, that 'r' is equivalent to 'rt' as in builtin
+            f = PickleableTextIOWrapper(
+                f, encoding=self.encoding, errors=self.errors, newline=self.newline
+            )
+            self.fobjects.append(f)
+
+        return self.fobjects[-1]
+
+    def __exit__(self, *args):
+        self.close()
+
+    @property
+    def full_name(self):
+        return _unstrip_protocol(self.path, self.fs)
+
+    def open(self):
+        """Materialise this as a real open file without context
+
+        The OpenFile object should be explicitly closed to avoid enclosed file
+        instances persisting. You must, therefore, keep a reference to the OpenFile
+        during the life of the file-like it generates.
+        """
+        return self.__enter__()
+
+    def close(self):
+        """Close all encapsulated file objects"""
+        for f in reversed(self.fobjects):
+            if "r" not in self.mode and not f.closed:
+                f.flush()
+            f.close()
+        self.fobjects.clear()
+
+
+class OpenFiles(list):
+    """List of OpenFile instances
+
+    Can be used in a single context, which opens and closes all of the
+    contained files. Normal list access to get the elements works as
+    normal.
+
+    A special case is made for caching filesystems - the files will
+    be down/uploaded together at the start or end of the context, and
+    this may happen concurrently, if the target filesystem supports it.
+    """
+
+    def __init__(self, *args, mode="rb", fs=None):
+        self.mode = mode
+        self.fs = fs
+        self.files = []
+        super().__init__(*args)
+
+    def __enter__(self):
+        if self.fs is None:
+            raise ValueError("Context has already been used")
+
+        fs = self.fs
+        while True:
+            if hasattr(fs, "open_many"):
+                # check for concurrent cache download; or set up for upload
+                self.files = fs.open_many(self)
+                return self.files
+            if hasattr(fs, "fs") and fs.fs is not None:
+                fs = fs.fs
+            else:
+                break
+        return [s.__enter__() for s in self]
+
+    def __exit__(self, *args):
+        fs = self.fs
+        [s.__exit__(*args) for s in self]
+        if "r" not in self.mode:
+            while True:
+                if hasattr(fs, "open_many"):
+                    # check for concurrent cache upload
+                    fs.commit_many(self.files)
+                    return
+                if hasattr(fs, "fs") and fs.fs is not None:
+                    fs = fs.fs
+                else:
+                    break
+
+    def __getitem__(self, item):
+        out = super().__getitem__(item)
+        if isinstance(item, slice):
+            return OpenFiles(out, mode=self.mode, fs=self.fs)
+        return out
+
+    def __repr__(self):
+        return f"<List of {len(self)} OpenFile instances>"
+
+
+def open_files(
+    urlpath,
+    mode="rb",
+    compression=None,
+    encoding="utf8",
+    errors=None,
+    name_function=None,
+    num=1,
+    protocol=None,
+    newline=None,
+    auto_mkdir=True,
+    expand=True,
+    **kwargs,
+):
+    """Given a path or paths, return a list of ``OpenFile`` objects.
+
+    For writing, a str path must contain the "*" character, which will be filled
+    in by increasing numbers, e.g., "part*" ->  "part1", "part2" if num=2.
+
+    For either reading or writing, can instead provide explicit list of paths.
+
+    Parameters
+    ----------
+    urlpath: string or list
+        Absolute or relative filepath(s). Prefix with a protocol like ``s3://``
+        to read from alternative filesystems. To read from multiple files you
+        can pass a globstring or a list of paths, with the caveat that they
+        must all have the same protocol.
+    mode: 'rb', 'wt', etc.
+    compression: string or None
+        If given, open file using compression codec. Can either be a compression
+        name (a key in ``fsspec.compression.compr``) or "infer" to guess the
+        compression from the filename suffix.
+    encoding: str
+        For text mode only
+    errors: None or str
+        Passed to TextIOWrapper in text mode
+    name_function: function or None
+        if opening a set of files for writing, those files do not yet exist,
+        so we need to generate their names by formatting the urlpath for
+        each sequence number
+    num: int [1]
+        if writing mode, number of files we expect to create (passed to
+        name+function)
+    protocol: str or None
+        If given, overrides the protocol found in the URL.
+    newline: bytes or None
+        Used for line terminator in text mode. If None, uses system default;
+        if blank, uses no translation.
+    auto_mkdir: bool (True)
+        If in write mode, this will ensure the target directory exists before
+        writing, by calling ``fs.mkdirs(exist_ok=True)``.
+    expand: bool
+    **kwargs: dict
+        Extra options that make sense to a particular storage connection, e.g.
+        host, port, username, password, etc.
+
+    Examples
+    --------
+    >>> files = open_files('2015-*-*.csv')  # doctest: +SKIP
+    >>> files = open_files(
+    ...     's3://bucket/2015-*-*.csv.gz', compression='gzip'
+    ... )  # doctest: +SKIP
+
+    Returns
+    -------
+    An ``OpenFiles`` instance, which is a list of ``OpenFile`` objects that can
+    be used as a single context
+
+    Notes
+    -----
+    For a full list of the available protocols and the implementations that
+    they map across to see the latest online documentation:
+
+    - For implementations built into ``fsspec`` see
+      https://filesystem-spec.readthedocs.io/en/latest/api.html#built-in-implementations
+    - For implementations in separate packages see
+      https://filesystem-spec.readthedocs.io/en/latest/api.html#other-known-implementations
+    """
+    fs, fs_token, paths = get_fs_token_paths(
+        urlpath,
+        mode,
+        num=num,
+        name_function=name_function,
+        storage_options=kwargs,
+        protocol=protocol,
+        expand=expand,
+    )
+    if fs.protocol == "file":
+        fs.auto_mkdir = auto_mkdir
+    elif "r" not in mode and auto_mkdir:
+        parents = {fs._parent(path) for path in paths}
+        for parent in parents:
+            try:
+                fs.makedirs(parent, exist_ok=True)
+            except PermissionError:
+                pass
+    return OpenFiles(
+        [
+            OpenFile(
+                fs,
+                path,
+                mode=mode,
+                compression=compression,
+                encoding=encoding,
+                errors=errors,
+                newline=newline,
+            )
+            for path in paths
+        ],
+        mode=mode,
+        fs=fs,
+    )
+
+
+def _un_chain(path, kwargs):
+    # Avoid a circular import
+    from fsspec.implementations.chained import ChainedFileSystem
+
+    if "::" in path:
+        x = re.compile(".*[^a-z]+.*")  # test for non protocol-like single word
+        bits = []
+        for p in path.split("::"):
+            if "://" in p or x.match(p):
+                bits.append(p)
+            else:
+                bits.append(p + "://")
+    else:
+        bits = [path]
+    # [[url, protocol, kwargs], ...]
+    out = []
+    previous_bit = None
+    kwargs = kwargs.copy()
+    for bit in reversed(bits):
+        protocol = kwargs.pop("protocol", None) or split_protocol(bit)[0] or "file"
+        cls = get_filesystem_class(protocol)
+        extra_kwargs = cls._get_kwargs_from_urls(bit)
+        kws = kwargs.pop(protocol, {})
+        if bit is bits[0]:
+            kws.update(kwargs)
+        kw = dict(
+            **{k: v for k, v in extra_kwargs.items() if k not in kws or v != kws[k]},
+            **kws,
+        )
+        bit = cls._strip_protocol(bit)
+        if "target_protocol" not in kw and issubclass(cls, ChainedFileSystem):
+            bit = previous_bit
+        out.append((bit, protocol, kw))
+        previous_bit = bit
+    out.reverse()
+    return out
+
+
+def url_to_fs(url, **kwargs):
+    """
+    Turn fully-qualified and potentially chained URL into filesystem instance
+
+    Parameters
+    ----------
+    url : str
+        The fsspec-compatible URL
+    **kwargs: dict
+        Extra options that make sense to a particular storage connection, e.g.
+        host, port, username, password, etc.
+
+    Returns
+    -------
+    filesystem : FileSystem
+        The new filesystem discovered from ``url`` and created with
+        ``**kwargs``.
+    urlpath : str
+        The file-systems-specific URL for ``url``.
+    """
+    url = stringify_path(url)
+    # non-FS arguments that appear in fsspec.open()
+    # inspect could keep this in sync with open()'s signature
+    known_kwargs = {
+        "compression",
+        "encoding",
+        "errors",
+        "expand",
+        "mode",
+        "name_function",
+        "newline",
+        "num",
+    }
+    kwargs = {k: v for k, v in kwargs.items() if k not in known_kwargs}
+    chain = _un_chain(url, kwargs)
+    inkwargs = {}
+    # Reverse iterate the chain, creating a nested target_* structure
+    for i, ch in enumerate(reversed(chain)):
+        urls, protocol, kw = ch
+        if i == len(chain) - 1:
+            inkwargs = dict(**kw, **inkwargs)
+            continue
+        inkwargs["target_options"] = dict(**kw, **inkwargs)
+        inkwargs["target_protocol"] = protocol
+        inkwargs["fo"] = urls
+    urlpath, protocol, _ = chain[0]
+    fs = filesystem(protocol, **inkwargs)
+    return fs, urlpath
+
+
+DEFAULT_EXPAND = conf.get("open_expand", False)
+
+
+def open(
+    urlpath,
+    mode="rb",
+    compression=None,
+    encoding="utf8",
+    errors=None,
+    protocol=None,
+    newline=None,
+    expand=None,
+    **kwargs,
+):
+    """Given a path or paths, return one ``OpenFile`` object.
+
+    Parameters
+    ----------
+    urlpath: string or list
+        Absolute or relative filepath. Prefix with a protocol like ``s3://``
+        to read from alternative filesystems. Should not include glob
+        character(s).
+    mode: 'rb', 'wt', etc.
+    compression: string or None
+        If given, open file using compression codec. Can either be a compression
+        name (a key in ``fsspec.compression.compr``) or "infer" to guess the
+        compression from the filename suffix.
+    encoding: str
+        For text mode only
+    errors: None or str
+        Passed to TextIOWrapper in text mode
+    protocol: str or None
+        If given, overrides the protocol found in the URL.
+    newline: bytes or None
+        Used for line terminator in text mode. If None, uses system default;
+        if blank, uses no translation.
+    expand: bool or None
+        Whether to regard file paths containing special glob characters as needing
+        expansion (finding the first match) or absolute. Setting False allows using
+        paths which do embed such characters. If None (default), this argument
+        takes its value from the DEFAULT_EXPAND module variable, which takes
+        its initial value from the "open_expand" config value at startup, which will
+        be False if not set.
+    **kwargs: dict
+        Extra options that make sense to a particular storage connection, e.g.
+        host, port, username, password, etc.
+
+    Examples
+    --------
+    >>> openfile = open('2015-01-01.csv')  # doctest: +SKIP
+    >>> openfile = open(
+    ...     's3://bucket/2015-01-01.csv.gz', compression='gzip'
+    ... )  # doctest: +SKIP
+    >>> with openfile as f:
+    ...     df = pd.read_csv(f)  # doctest: +SKIP
+    ...
+
+    Returns
+    -------
+    ``OpenFile`` object.
+
+    Notes
+    -----
+    For a full list of the available protocols and the implementations that
+    they map across to see the latest online documentation:
+
+    - For implementations built into ``fsspec`` see
+      https://filesystem-spec.readthedocs.io/en/latest/api.html#built-in-implementations
+    - For implementations in separate packages see
+      https://filesystem-spec.readthedocs.io/en/latest/api.html#other-known-implementations
+    """
+    expand = DEFAULT_EXPAND if expand is None else expand
+    out = open_files(
+        urlpath=[urlpath],
+        mode=mode,
+        compression=compression,
+        encoding=encoding,
+        errors=errors,
+        protocol=protocol,
+        newline=newline,
+        expand=expand,
+        **kwargs,
+    )
+    if not out:
+        raise FileNotFoundError(urlpath)
+    return out[0]
+
+
+def open_local(
+    url: str | list[str] | Path | list[Path],
+    mode: str = "rb",
+    **storage_options: dict,
+) -> str | list[str]:
+    """Open file(s) which can be resolved to local
+
+    For files which either are local, or get downloaded upon open
+    (e.g., by file caching)
+
+    Parameters
+    ----------
+    url: str or list(str)
+    mode: str
+        Must be read mode
+    storage_options:
+        passed on to FS for or used by open_files (e.g., compression)
+    """
+    if "r" not in mode:
+        raise ValueError("Can only ensure local files when reading")
+    of = open_files(url, mode=mode, **storage_options)
+    if not getattr(of[0].fs, "local_file", False):
+        raise ValueError(
+            "open_local can only be used on a filesystem which"
+            " has attribute local_file=True"
+        )
+    with of as files:
+        paths = [f.name for f in files]
+    if (isinstance(url, str) and not has_magic(url)) or isinstance(url, Path):
+        return paths[0]
+    return paths
+
+
+def get_compression(urlpath, compression):
+    if compression == "infer":
+        compression = infer_compression(urlpath)
+    if compression is not None and compression not in compr:
+        raise ValueError(f"Compression type {compression} not supported")
+    return compression
+
+
+def split_protocol(urlpath):
+    """Return protocol, path pair"""
+    urlpath = stringify_path(urlpath)
+    if "://" in urlpath:
+        protocol, path = urlpath.split("://", 1)
+        if len(protocol) > 1:
+            # excludes Windows paths
+            return protocol, path
+    if urlpath.startswith("data:"):
+        return urlpath.split(":", 1)
+    return None, urlpath
+
+
+def strip_protocol(urlpath):
+    """Return only path part of full URL, according to appropriate backend"""
+    protocol, _ = split_protocol(urlpath)
+    cls = get_filesystem_class(protocol)
+    return cls._strip_protocol(urlpath)
+
+
+def expand_paths_if_needed(paths, mode, num, fs, name_function):
+    """Expand paths if they have a ``*`` in them (write mode) or any of ``*?[]``
+    in them (read mode).
+
+    :param paths: list of paths
+    mode: str
+        Mode in which to open files.
+    num: int
+        If opening in writing mode, number of files we expect to create.
+    fs: filesystem object
+    name_function: callable
+        If opening in writing mode, this callable is used to generate path
+        names. Names are generated for each partition by
+        ``urlpath.replace('*', name_function(partition_index))``.
+    :return: list of paths
+    """
+    expanded_paths = []
+    paths = list(paths)
+
+    if "w" in mode:  # read mode
+        if sum(1 for p in paths if "*" in p) > 1:
+            raise ValueError(
+                "When writing data, only one filename mask can be specified."
+            )
+        num = max(num, len(paths))
+
+        for curr_path in paths:
+            if "*" in curr_path:
+                # expand using name_function
+                expanded_paths.extend(_expand_paths(curr_path, name_function, num))
+            else:
+                expanded_paths.append(curr_path)
+        # if we generated more paths that asked for, trim the list
+        if len(expanded_paths) > num:
+            expanded_paths = expanded_paths[:num]
+
+    else:  # read mode
+        for curr_path in paths:
+            if has_magic(curr_path):
+                # expand using glob
+                expanded_paths.extend(fs.glob(curr_path))
+            else:
+                expanded_paths.append(curr_path)
+
+    return expanded_paths
+
+
+def get_fs_token_paths(
+    urlpath,
+    mode="rb",
+    num=1,
+    name_function=None,
+    storage_options=None,
+    protocol=None,
+    expand=True,
+):
+    """Filesystem, deterministic token, and paths from a urlpath and options.
+
+    Parameters
+    ----------
+    urlpath: string or iterable
+        Absolute or relative filepath, URL (may include protocols like
+        ``s3://``), or globstring pointing to data.
+    mode: str, optional
+        Mode in which to open files.
+    num: int, optional
+        If opening in writing mode, number of files we expect to create.
+    name_function: callable, optional
+        If opening in writing mode, this callable is used to generate path
+        names. Names are generated for each partition by
+        ``urlpath.replace('*', name_function(partition_index))``.
+    storage_options: dict, optional
+        Additional keywords to pass to the filesystem class.
+    protocol: str or None
+        To override the protocol specifier in the URL
+    expand: bool
+        Expand string paths for writing, assuming the path is a directory
+    """
+    if isinstance(urlpath, (list, tuple, set)):
+        if not urlpath:
+            raise ValueError("empty urlpath sequence")
+        urlpath0 = stringify_path(next(iter(urlpath)))
+    else:
+        urlpath0 = stringify_path(urlpath)
+    storage_options = storage_options or {}
+    if protocol:
+        storage_options["protocol"] = protocol
+    chain = _un_chain(urlpath0, storage_options or {})
+    inkwargs = {}
+    # Reverse iterate the chain, creating a nested target_* structure
+    for i, ch in enumerate(reversed(chain)):
+        urls, nested_protocol, kw = ch
+        if i == len(chain) - 1:
+            inkwargs = dict(**kw, **inkwargs)
+            continue
+        inkwargs["target_options"] = dict(**kw, **inkwargs)
+        inkwargs["target_protocol"] = nested_protocol
+        inkwargs["fo"] = urls
+    paths, protocol, _ = chain[0]
+    fs = filesystem(protocol, **inkwargs)
+    if isinstance(urlpath, (list, tuple, set)):
+        pchains = [
+            _un_chain(stringify_path(u), storage_options or {})[0] for u in urlpath
+        ]
+        if len({pc[1] for pc in pchains}) > 1:
+            raise ValueError("Protocol mismatch getting fs from %s", urlpath)
+        paths = [pc[0] for pc in pchains]
+    else:
+        paths = fs._strip_protocol(paths)
+    if isinstance(paths, (list, tuple, set)):
+        if expand:
+            paths = expand_paths_if_needed(paths, mode, num, fs, name_function)
+        elif not isinstance(paths, list):
+            paths = list(paths)
+    else:
+        if ("w" in mode or "x" in mode) and expand:
+            paths = _expand_paths(paths, name_function, num)
+        elif "*" in paths:
+            paths = [f for f in sorted(fs.glob(paths)) if not fs.isdir(f)]
+        else:
+            paths = [paths]
+
+    return fs, fs._fs_token, paths
+
+
+def _expand_paths(path, name_function, num):
+    if isinstance(path, str):
+        if path.count("*") > 1:
+            raise ValueError("Output path spec must contain exactly one '*'.")
+        elif "*" not in path:
+            path = os.path.join(path, "*.part")
+
+        if name_function is None:
+            name_function = build_name_function(num - 1)
+
+        paths = [path.replace("*", name_function(i)) for i in range(num)]
+        if paths != sorted(paths):
+            logger.warning(
+                "In order to preserve order between partitions"
+                " paths created with ``name_function`` should "
+                "sort to partition order"
+            )
+    elif isinstance(path, (tuple, list)):
+        assert len(path) == num
+        paths = list(path)
+    else:
+        raise ValueError(
+            "Path should be either\n"
+            "1. A list of paths: ['foo.json', 'bar.json', ...]\n"
+            "2. A directory: 'foo/\n"
+            "3. A path with a '*' in it: 'foo.*.json'"
+        )
+    return paths
+
+
+class PickleableTextIOWrapper(io.TextIOWrapper):
+    """TextIOWrapper cannot be pickled. This solves it.
+
+    Requires that ``buffer`` be pickleable, which all instances of
+    AbstractBufferedFile are.
+    """
+
+    def __init__(
+        self,
+        buffer,
+        encoding=None,
+        errors=None,
+        newline=None,
+        line_buffering=False,
+        write_through=False,
+    ):
+        self.args = buffer, encoding, errors, newline, line_buffering, write_through
+        super().__init__(*self.args)
+
+    def __reduce__(self):
+        return PickleableTextIOWrapper, self.args

backend_service/venv/lib/python3.13/site-packages/fsspec/dircache.py

@@ -0,0 +1,98 @@
+import time
+from collections.abc import MutableMapping
+from functools import lru_cache
+
+
+class DirCache(MutableMapping):
+    """
+    Caching of directory listings, in a structure like::
+
+        {"path0": [
+            {"name": "path0/file0",
+             "size": 123,
+             "type": "file",
+             ...
+            },
+            {"name": "path0/file1",
+            },
+            ...
+            ],
+         "path1": [...]
+        }
+
+    Parameters to this class control listing expiry or indeed turn
+    caching off
+    """
+
+    def __init__(
+        self,
+        use_listings_cache=True,
+        listings_expiry_time=None,
+        max_paths=None,
+        **kwargs,
+    ):
+        """
+
+        Parameters
+        ----------
+        use_listings_cache: bool
+            If False, this cache never returns items, but always reports KeyError,
+            and setting items has no effect
+        listings_expiry_time: int or float (optional)
+            Time in seconds that a listing is considered valid. If None,
+            listings do not expire.
+        max_paths: int (optional)
+            The number of most recent listings that are considered valid; 'recent'
+            refers to when the entry was set.
+        """
+        self._cache = {}
+        self._times = {}
+        if max_paths:
+            self._q = lru_cache(max_paths + 1)(lambda key: self._cache.pop(key, None))
+        self.use_listings_cache = use_listings_cache
+        self.listings_expiry_time = listings_expiry_time
+        self.max_paths = max_paths
+
+    def __getitem__(self, item):
+        if self.listings_expiry_time is not None:
+            if self._times.get(item, 0) - time.time() < -self.listings_expiry_time:
+                del self._cache[item]
+        if self.max_paths:
+            self._q(item)
+        return self._cache[item]  # maybe raises KeyError
+
+    def clear(self):
+        self._cache.clear()
+
+    def __len__(self):
+        return len(self._cache)
+
+    def __contains__(self, item):
+        try:
+            self[item]
+            return True
+        except KeyError:
+            return False
+
+    def __setitem__(self, key, value):
+        if not self.use_listings_cache:
+            return
+        if self.max_paths:
+            self._q(key)
+        self._cache[key] = value
+        if self.listings_expiry_time is not None:
+            self._times[key] = time.time()
+
+    def __delitem__(self, key):
+        del self._cache[key]
+
+    def __iter__(self):
+        entries = list(self._cache)
+
+        return (k for k in entries if k in self)
+
+    def __reduce__(self):
+        return (
+            DirCache,
+            (self.use_listings_cache, self.listings_expiry_time, self.max_paths),
+        )

backend_service/venv/lib/python3.13/site-packages/fsspec/exceptions.py

@@ -0,0 +1,18 @@
+"""
+fsspec user-defined exception classes
+"""
+
+import asyncio
+
+
+class BlocksizeMismatchError(ValueError):
+    """
+    Raised when a cached file is opened with a different blocksize than it was
+    written with
+    """
+
+
+class FSTimeoutError(asyncio.TimeoutError):
+    """
+    Raised when a fsspec function timed out occurs
+    """

backend_service/venv/lib/python3.13/site-packages/fsspec/fuse.py

@@ -0,0 +1,324 @@
+import argparse
+import logging
+import os
+import stat
+import threading
+import time
+from errno import EIO, ENOENT
+
+from fuse import FUSE, FuseOSError, LoggingMixIn, Operations
+
+from fsspec import __version__
+from fsspec.core import url_to_fs
+
+logger = logging.getLogger("fsspec.fuse")
+
+
+class FUSEr(Operations):
+    def __init__(self, fs, path, ready_file=False):
+        self.fs = fs
+        self.cache = {}
+        self.root = path.rstrip("/") + "/"
+        self.counter = 0
+        logger.info("Starting FUSE at %s", path)
+        self._ready_file = ready_file
+
+    def getattr(self, path, fh=None):
+        logger.debug("getattr %s", path)
+        if self._ready_file and path in ["/.fuse_ready", ".fuse_ready"]:
+            return {"type": "file", "st_size": 5}
+
+        path = "".join([self.root, path.lstrip("/")]).rstrip("/")
+        try:
+            info = self.fs.info(path)
+        except FileNotFoundError as exc:
+            raise FuseOSError(ENOENT) from exc
+
+        data = {"st_uid": info.get("uid", 1000), "st_gid": info.get("gid", 1000)}
+        perm = info.get("mode", 0o777)
+
+        if info["type"] != "file":
+            data["st_mode"] = stat.S_IFDIR | perm
+            data["st_size"] = 0
+            data["st_blksize"] = 0
+        else:
+            data["st_mode"] = stat.S_IFREG | perm
+            data["st_size"] = info["size"]
+            data["st_blksize"] = 5 * 2**20
+            data["st_nlink"] = 1
+        data["st_atime"] = info["atime"] if "atime" in info else time.time()
+        data["st_ctime"] = info["ctime"] if "ctime" in info else time.time()
+        data["st_mtime"] = info["mtime"] if "mtime" in info else time.time()
+        return data
+
+    def readdir(self, path, fh):
+        logger.debug("readdir %s", path)
+        path = "".join([self.root, path.lstrip("/")])
+        files = self.fs.ls(path, False)
+        files = [os.path.basename(f.rstrip("/")) for f in files]
+        return [".", ".."] + files
+
+    def mkdir(self, path, mode):
+        path = "".join([self.root, path.lstrip("/")])
+        self.fs.mkdir(path)
+        return 0
+
+    def rmdir(self, path):
+        path = "".join([self.root, path.lstrip("/")])
+        self.fs.rmdir(path)
+        return 0
+
+    def read(self, path, size, offset, fh):
+        logger.debug("read %s", (path, size, offset))
+        if self._ready_file and path in ["/.fuse_ready", ".fuse_ready"]:
+            # status indicator
+            return b"ready"
+
+        f = self.cache[fh]
+        f.seek(offset)
+        out = f.read(size)
+        return out
+
+    def write(self, path, data, offset, fh):
+        logger.debug("write %s", (path, offset))
+        f = self.cache[fh]
+        f.seek(offset)
+        f.write(data)
+        return len(data)
+
+    def create(self, path, flags, fi=None):
+        logger.debug("create %s", (path, flags))
+        fn = "".join([self.root, path.lstrip("/")])
+        self.fs.touch(fn)  # OS will want to get attributes immediately
+        f = self.fs.open(fn, "wb")
+        self.cache[self.counter] = f
+        self.counter += 1
+        return self.counter - 1
+
+    def open(self, path, flags):
+        logger.debug("open %s", (path, flags))
+        fn = "".join([self.root, path.lstrip("/")])
+        if flags % 2 == 0:
+            # read
+            mode = "rb"
+        else:
+            # write/create
+            mode = "wb"
+        self.cache[self.counter] = self.fs.open(fn, mode)
+        self.counter += 1
+        return self.counter - 1
+
+    def truncate(self, path, length, fh=None):
+        fn = "".join([self.root, path.lstrip("/")])
+        if length != 0:
+            raise NotImplementedError
+        # maybe should be no-op since open with write sets size to zero anyway
+        self.fs.touch(fn)
+
+    def unlink(self, path):
+        fn = "".join([self.root, path.lstrip("/")])
+        try:
+            self.fs.rm(fn, False)
+        except (OSError, FileNotFoundError) as exc:
+            raise FuseOSError(EIO) from exc
+
+    def release(self, path, fh):
+        try:
+            if fh in self.cache:
+                f = self.cache[fh]
+                f.close()
+                self.cache.pop(fh)
+        except Exception as e:
+            print(e)
+        return 0
+
+    def chmod(self, path, mode):
+        if hasattr(self.fs, "chmod"):
+            path = "".join([self.root, path.lstrip("/")])
+            return self.fs.chmod(path, mode)
+        raise NotImplementedError
+
+
+def run(
+    fs,
+    path,
+    mount_point,
+    foreground=True,
+    threads=False,
+    ready_file=False,
+    ops_class=FUSEr,
+):
+    """Mount stuff in a local directory
+
+    This uses fusepy to make it appear as if a given path on an fsspec
+    instance is in fact resident within the local file-system.
+
+    This requires that fusepy by installed, and that FUSE be available on
+    the system (typically requiring a package to be installed with
+    apt, yum, brew, etc.).
+
+    Parameters
+    ----------
+    fs: file-system instance
+        From one of the compatible implementations
+    path: str
+        Location on that file-system to regard as the root directory to
+        mount. Note that you typically should include the terminating "/"
+        character.
+    mount_point: str
+        An empty directory on the local file-system where the contents of
+        the remote path will appear.
+    foreground: bool
+        Whether or not calling this function will block. Operation will
+        typically be more stable if True.
+    threads: bool
+        Whether or not to create threads when responding to file operations
+        within the mounter directory. Operation will typically be more
+        stable if False.
+    ready_file: bool
+        Whether the FUSE process is ready. The ``.fuse_ready`` file will
+        exist in the ``mount_point`` directory if True. Debugging purpose.
+    ops_class: FUSEr or Subclass of FUSEr
+        To override the default behavior of FUSEr. For Example, logging
+        to file.
+
+    """
+    func = lambda: FUSE(
+        ops_class(fs, path, ready_file=ready_file),
+        mount_point,
+        nothreads=not threads,
+        foreground=foreground,
+    )
+    if not foreground:
+        th = threading.Thread(target=func)
+        th.daemon = True
+        th.start()
+        return th
+    else:  # pragma: no cover
+        try:
+            func()
+        except KeyboardInterrupt:
+            pass
+
+
+def main(args):
+    """Mount filesystem from chained URL to MOUNT_POINT.
+
+    Examples:
+
+    python3 -m fsspec.fuse memory /usr/share /tmp/mem
+
+    python3 -m fsspec.fuse local /tmp/source /tmp/local \\
+            -l /tmp/fsspecfuse.log
+
+    You can also mount chained-URLs and use special settings:
+
+    python3 -m fsspec.fuse 'filecache::zip::file://data.zip' \\
+            / /tmp/zip \\
+            -o 'filecache-cache_storage=/tmp/simplecache'
+
+    You can specify the type of the setting by using `[int]` or `[bool]`,
+    (`true`, `yes`, `1` represents the Boolean value `True`):
+
+    python3 -m fsspec.fuse 'simplecache::ftp://ftp1.at.proftpd.org' \\
+            /historic/packages/RPMS /tmp/ftp \\
+            -o 'simplecache-cache_storage=/tmp/simplecache' \\
+            -o 'simplecache-check_files=false[bool]' \\
+            -o 'ftp-listings_expiry_time=60[int]' \\
+            -o 'ftp-username=anonymous' \\
+            -o 'ftp-password=xieyanbo'
+    """
+
+    class RawDescriptionArgumentParser(argparse.ArgumentParser):
+        def format_help(self):
+            usage = super().format_help()
+            parts = usage.split("\n\n")
+            parts[1] = self.description.rstrip()
+            return "\n\n".join(parts)
+
+    parser = RawDescriptionArgumentParser(prog="fsspec.fuse", description=main.__doc__)
+    parser.add_argument("--version", action="version", version=__version__)
+    parser.add_argument("url", type=str, help="fs url")
+    parser.add_argument("source_path", type=str, help="source directory in fs")
+    parser.add_argument("mount_point", type=str, help="local directory")
+    parser.add_argument(
+        "-o",
+        "--option",
+        action="append",
+        help="Any options of protocol included in the chained URL",
+    )
+    parser.add_argument(
+        "-l", "--log-file", type=str, help="Logging FUSE debug info (Default: '')"
+    )
+    parser.add_argument(
+        "-f",
+        "--foreground",
+        action="store_false",
+        help="Running in foreground or not (Default: False)",
+    )
+    parser.add_argument(
+        "-t",
+        "--threads",
+        action="store_false",
+        help="Running with threads support (Default: False)",
+    )
+    parser.add_argument(
+        "-r",
+        "--ready-file",
+        action="store_false",
+        help="The `.fuse_ready` file will exist after FUSE is ready. "
+        "(Debugging purpose, Default: False)",
+    )
+    args = parser.parse_args(args)
+
+    kwargs = {}
+    for item in args.option or []:
+        key, sep, value = item.partition("=")
+        if not sep:
+            parser.error(message=f"Wrong option: {item!r}")
+        val = value.lower()
+        if val.endswith("[int]"):
+            value = int(value[: -len("[int]")])
+        elif val.endswith("[bool]"):
+            value = val[: -len("[bool]")] in ["1", "yes", "true"]
+
+        if "-" in key:
+            fs_name, setting_name = key.split("-", 1)
+            if fs_name in kwargs:
+                kwargs[fs_name][setting_name] = value
+            else:
+                kwargs[fs_name] = {setting_name: value}
+        else:
+            kwargs[key] = value
+
+    if args.log_file:
+        logging.basicConfig(
+            level=logging.DEBUG,
+            filename=args.log_file,
+            format="%(asctime)s %(message)s",
+        )
+
+        class LoggingFUSEr(FUSEr, LoggingMixIn):
+            pass
+
+        fuser = LoggingFUSEr
+    else:
+        fuser = FUSEr
+
+    fs, url_path = url_to_fs(args.url, **kwargs)
+    logger.debug("Mounting %s to %s", url_path, str(args.mount_point))
+    run(
+        fs,
+        args.source_path,
+        args.mount_point,
+        foreground=args.foreground,
+        threads=args.threads,
+        ready_file=args.ready_file,
+        ops_class=fuser,
+    )
+
+
+if __name__ == "__main__":
+    import sys
+
+    main(sys.argv[1:])

backend_service/venv/lib/python3.13/site-packages/fsspec/generic.py

@@ -0,0 +1,396 @@
+from __future__ import annotations
+
+import inspect
+import logging
+import os
+import shutil
+import uuid
+
+from .asyn import AsyncFileSystem, _run_coros_in_chunks, sync_wrapper
+from .callbacks import DEFAULT_CALLBACK
+from .core import filesystem, get_filesystem_class, split_protocol, url_to_fs
+
+_generic_fs = {}
+logger = logging.getLogger("fsspec.generic")
+
+
+def set_generic_fs(protocol, **storage_options):
+    """Populate the dict used for method=="generic" lookups"""
+    _generic_fs[protocol] = filesystem(protocol, **storage_options)
+
+
+def _resolve_fs(url, method, protocol=None, storage_options=None):
+    """Pick instance of backend FS"""
+    url = url[0] if isinstance(url, (list, tuple)) else url
+    protocol = protocol or split_protocol(url)[0]
+    storage_options = storage_options or {}
+    if method == "default":
+        return filesystem(protocol)
+    if method == "generic":
+        return _generic_fs[protocol]
+    if method == "current":
+        cls = get_filesystem_class(protocol)
+        return cls.current()
+    if method == "options":
+        fs, _ = url_to_fs(url, **storage_options.get(protocol, {}))
+        return fs
+    raise ValueError(f"Unknown FS resolution method: {method}")
+
+
+def rsync(
+    source,
+    destination,
+    delete_missing=False,
+    source_field="size",
+    dest_field="size",
+    update_cond="different",
+    inst_kwargs=None,
+    fs=None,
+    **kwargs,
+):
+    """Sync files between two directory trees
+
+    (experimental)
+
+    Parameters
+    ----------
+    source: str
+        Root of the directory tree to take files from. This must be a directory, but
+        do not include any terminating "/" character
+    destination: str
+        Root path to copy into. The contents of this location should be
+        identical to the contents of ``source`` when done. This will be made a
+        directory, and the terminal "/" should not be included.
+    delete_missing: bool
+        If there are paths in the destination that don't exist in the
+        source and this is True, delete them. Otherwise, leave them alone.
+    source_field: str | callable
+        If ``update_field`` is "different", this is the key in the info
+        of source files to consider for difference. Maybe a function of the
+        info dict.
+    dest_field: str | callable
+        If ``update_field`` is "different", this is the key in the info
+        of destination files to consider for difference. May be a function of
+        the info dict.
+    update_cond: "different"|"always"|"never"
+        If "always", every file is copied, regardless of whether it exists in
+        the destination. If "never", files that exist in the destination are
+        not copied again. If "different" (default), only copy if the info
+        fields given by ``source_field`` and ``dest_field`` (usually "size")
+        are different. Other comparisons may be added in the future.
+    inst_kwargs: dict|None
+        If ``fs`` is None, use this set of keyword arguments to make a
+        GenericFileSystem instance
+    fs: GenericFileSystem|None
+        Instance to use if explicitly given. The instance defines how to
+        to make downstream file system instances from paths.
+
+    Returns
+    -------
+    dict of the copy operations that were performed, {source: destination}
+    """
+    fs = fs or GenericFileSystem(**(inst_kwargs or {}))
+    source = fs._strip_protocol(source)
+    destination = fs._strip_protocol(destination)
+    allfiles = fs.find(source, withdirs=True, detail=True)
+    if not fs.isdir(source):
+        raise ValueError("Can only rsync on a directory")
+    otherfiles = fs.find(destination, withdirs=True, detail=True)
+    dirs = [
+        a
+        for a, v in allfiles.items()
+        if v["type"] == "directory" and a.replace(source, destination) not in otherfiles
+    ]
+    logger.debug(f"{len(dirs)} directories to create")
+    if dirs:
+        fs.make_many_dirs(
+            [dirn.replace(source, destination) for dirn in dirs], exist_ok=True
+        )
+    allfiles = {a: v for a, v in allfiles.items() if v["type"] == "file"}
+    logger.debug(f"{len(allfiles)} files to consider for copy")
+    to_delete = [
+        o
+        for o, v in otherfiles.items()
+        if o.replace(destination, source) not in allfiles and v["type"] == "file"
+    ]
+    for k, v in allfiles.copy().items():
+        otherfile = k.replace(source, destination)
+        if otherfile in otherfiles:
+            if update_cond == "always":
+                allfiles[k] = otherfile
+            elif update_cond == "never":
+                allfiles.pop(k)
+            elif update_cond == "different":
+                inf1 = source_field(v) if callable(source_field) else v[source_field]
+                v2 = otherfiles[otherfile]
+                inf2 = dest_field(v2) if callable(dest_field) else v2[dest_field]
+                if inf1 != inf2:
+                    # details mismatch, make copy
+                    allfiles[k] = otherfile
+                else:
+                    # details match, don't copy
+                    allfiles.pop(k)
+        else:
+            # file not in target yet
+            allfiles[k] = otherfile
+    logger.debug(f"{len(allfiles)} files to copy")
+    if allfiles:
+        source_files, target_files = zip(*allfiles.items())
+        fs.cp(source_files, target_files, **kwargs)
+    logger.debug(f"{len(to_delete)} files to delete")
+    if delete_missing and to_delete:
+        fs.rm(to_delete)
+    return allfiles
+
+
+class GenericFileSystem(AsyncFileSystem):
+    """Wrapper over all other FS types
+
+    <experimental!>
+
+    This implementation is a single unified interface to be able to run FS operations
+    over generic URLs, and dispatch to the specific implementations using the URL
+    protocol prefix.
+
+    Note: instances of this FS are always async, even if you never use it with any async
+    backend.
+    """
+
+    protocol = "generic"  # there is no real reason to ever use a protocol with this FS
+
+    def __init__(self, default_method="default", storage_options=None, **kwargs):
+        """
+
+        Parameters
+        ----------
+        default_method: str (optional)
+            Defines how to configure backend FS instances. Options are:
+            - "default": instantiate like FSClass(), with no
+              extra arguments; this is the default instance of that FS, and can be
+              configured via the config system
+            - "generic": takes instances from the `_generic_fs` dict in this module,
+              which you must populate before use. Keys are by protocol
+            - "options": expects storage_options, a dict mapping protocol to
+              kwargs to use when constructing the filesystem
+            - "current": takes the most recently instantiated version of each FS
+        """
+        self.method = default_method
+        self.st_opts = storage_options
+        super().__init__(**kwargs)
+
+    def _parent(self, path):
+        fs = _resolve_fs(path, self.method, storage_options=self.st_opts)
+        return fs.unstrip_protocol(fs._parent(path))
+
+    def _strip_protocol(self, path):
+        # normalization only
+        fs = _resolve_fs(path, self.method, storage_options=self.st_opts)
+        return fs.unstrip_protocol(fs._strip_protocol(path))
+
+    async def _find(self, path, maxdepth=None, withdirs=False, detail=False, **kwargs):
+        fs = _resolve_fs(path, self.method, storage_options=self.st_opts)
+        if fs.async_impl:
+            out = await fs._find(
+                path, maxdepth=maxdepth, withdirs=withdirs, detail=True, **kwargs
+            )
+        else:
+            out = fs.find(
+                path, maxdepth=maxdepth, withdirs=withdirs, detail=True, **kwargs
+            )
+        result = {}
+        for k, v in out.items():
+            v = v.copy()  # don't corrupt target FS dircache
+            name = fs.unstrip_protocol(k)
+            v["name"] = name
+            result[name] = v
+        if detail:
+            return result
+        return list(result)
+
+    async def _info(self, url, **kwargs):
+        fs = _resolve_fs(url, self.method)
+        if fs.async_impl:
+            out = await fs._info(url, **kwargs)
+        else:
+            out = fs.info(url, **kwargs)
+        out = out.copy()  # don't edit originals
+        out["name"] = fs.unstrip_protocol(out["name"])
+        return out
+
+    async def _ls(
+        self,
+        url,
+        detail=True,
+        **kwargs,
+    ):
+        fs = _resolve_fs(url, self.method)
+        if fs.async_impl:
+            out = await fs._ls(url, detail=True, **kwargs)
+        else:
+            out = fs.ls(url, detail=True, **kwargs)
+        out = [o.copy() for o in out]  # don't edit originals
+        for o in out:
+            o["name"] = fs.unstrip_protocol(o["name"])
+        if detail:
+            return out
+        else:
+            return [o["name"] for o in out]
+
+    async def _cat_file(
+        self,
+        url,
+        **kwargs,
+    ):
+        fs = _resolve_fs(url, self.method)
+        if fs.async_impl:
+            return await fs._cat_file(url, **kwargs)
+        else:
+            return fs.cat_file(url, **kwargs)
+
+    async def _pipe_file(
+        self,
+        path,
+        value,
+        **kwargs,
+    ):
+        fs = _resolve_fs(path, self.method, storage_options=self.st_opts)
+        if fs.async_impl:
+            return await fs._pipe_file(path, value, **kwargs)
+        else:
+            return fs.pipe_file(path, value, **kwargs)
+
+    async def _rm(self, url, **kwargs):
+        urls = url
+        if isinstance(urls, str):
+            urls = [urls]
+        fs = _resolve_fs(urls[0], self.method)
+        if fs.async_impl:
+            await fs._rm(urls, **kwargs)
+        else:
+            fs.rm(url, **kwargs)
+
+    async def _makedirs(self, path, exist_ok=False):
+        logger.debug("Make dir %s", path)
+        fs = _resolve_fs(path, self.method, storage_options=self.st_opts)
+        if fs.async_impl:
+            await fs._makedirs(path, exist_ok=exist_ok)
+        else:
+            fs.makedirs(path, exist_ok=exist_ok)
+
+    def rsync(self, source, destination, **kwargs):
+        """Sync files between two directory trees
+
+        See `func:rsync` for more details.
+        """
+        rsync(source, destination, fs=self, **kwargs)
+
+    async def _cp_file(
+        self,
+        url,
+        url2,
+        blocksize=2**20,
+        callback=DEFAULT_CALLBACK,
+        tempdir: str | None = None,
+        **kwargs,
+    ):
+        fs = _resolve_fs(url, self.method)
+        fs2 = _resolve_fs(url2, self.method)
+        if fs is fs2:
+            # pure remote
+            if fs.async_impl:
+                return await fs._copy(url, url2, **kwargs)
+            else:
+                return fs.copy(url, url2, **kwargs)
+        await copy_file_op(fs, [url], fs2, [url2], tempdir, 1, on_error="raise")
+
+    async def _make_many_dirs(self, urls, exist_ok=True):
+        fs = _resolve_fs(urls[0], self.method)
+        if fs.async_impl:
+            coros = [fs._makedirs(u, exist_ok=exist_ok) for u in urls]
+            await _run_coros_in_chunks(coros)
+        else:
+            for u in urls:
+                fs.makedirs(u, exist_ok=exist_ok)
+
+    make_many_dirs = sync_wrapper(_make_many_dirs)
+
+    async def _copy(
+        self,
+        path1: list[str],
+        path2: list[str],
+        recursive: bool = False,
+        on_error: str = "ignore",
+        maxdepth: int | None = None,
+        batch_size: int | None = None,
+        tempdir: str | None = None,
+        **kwargs,
+    ):
+        # TODO: special case for one FS being local, which can use get/put
+        # TODO: special case for one being memFS, which can use cat/pipe
+        if recursive:
+            raise NotImplementedError("Please use fsspec.generic.rsync")
+        path1 = [path1] if isinstance(path1, str) else path1
+        path2 = [path2] if isinstance(path2, str) else path2
+
+        fs = _resolve_fs(path1, self.method)
+        fs2 = _resolve_fs(path2, self.method)
+
+        if fs is fs2:
+            if fs.async_impl:
+                return await fs._copy(path1, path2, **kwargs)
+            else:
+                return fs.copy(path1, path2, **kwargs)
+
+        await copy_file_op(
+            fs, path1, fs2, path2, tempdir, batch_size, on_error=on_error
+        )
+
+
+async def copy_file_op(
+    fs1, url1, fs2, url2, tempdir=None, batch_size=20, on_error="ignore"
+):
+    import tempfile
+
+    tempdir = tempdir or tempfile.mkdtemp()
+    try:
+        coros = [
+            _copy_file_op(
+                fs1,
+                u1,
+                fs2,
+                u2,
+                os.path.join(tempdir, uuid.uuid4().hex),
+            )
+            for u1, u2 in zip(url1, url2)
+        ]
+        out = await _run_coros_in_chunks(
+            coros, batch_size=batch_size, return_exceptions=True
+        )
+    finally:
+        shutil.rmtree(tempdir)
+    if on_error == "return":
+        return out
+    elif on_error == "raise":
+        for o in out:
+            if isinstance(o, Exception):
+                raise o
+
+
+async def _copy_file_op(fs1, url1, fs2, url2, local, on_error="ignore"):
+    if fs1.async_impl:
+        await fs1._get_file(url1, local)
+    else:
+        fs1.get_file(url1, local)
+    if fs2.async_impl:
+        await fs2._put_file(local, url2)
+    else:
+        fs2.put_file(local, url2)
+    os.unlink(local)
+    logger.debug("Copy %s -> %s; done", url1, url2)
+
+
+async def maybe_await(cor):
+    if inspect.iscoroutine(cor):
+        return await cor
+    else:
+        return cor

backend_service/venv/lib/python3.13/site-packages/fsspec/gui.py

@@ -0,0 +1,417 @@
+import ast
+import contextlib
+import logging
+import os
+import re
+from collections.abc import Sequence
+from typing import ClassVar
+
+import panel as pn
+
+from .core import OpenFile, get_filesystem_class, split_protocol
+from .registry import known_implementations
+
+pn.extension()
+logger = logging.getLogger("fsspec.gui")
+
+
+class SigSlot:
+    """Signal-slot mixin, for Panel event passing
+
+    Include this class in a widget manager's superclasses to be able to
+    register events and callbacks on Panel widgets managed by that class.
+
+    The method ``_register`` should be called as widgets are added, and external
+    code should call ``connect`` to associate callbacks.
+
+    By default, all signals emit a DEBUG logging statement.
+    """
+
+    # names of signals that this class may emit each of which must be
+    # set by _register for any new instance
+    signals: ClassVar[Sequence[str]] = []
+    # names of actions that this class may respond to
+    slots: ClassVar[Sequence[str]] = []
+
+    # each of which must be a method name
+
+    def __init__(self):
+        self._ignoring_events = False
+        self._sigs = {}
+        self._map = {}
+        self._setup()
+
+    def _setup(self):
+        """Create GUI elements and register signals"""
+        self.panel = pn.pane.PaneBase()
+        # no signals to set up in the base class
+
+    def _register(
+        self, widget, name, thing="value", log_level=logging.DEBUG, auto=False
+    ):
+        """Watch the given attribute of a widget and assign it a named event
+
+        This is normally called at the time a widget is instantiated, in the
+        class which owns it.
+
+        Parameters
+        ----------
+        widget : pn.layout.Panel or None
+            Widget to watch. If None, an anonymous signal not associated with
+            any widget.
+        name : str
+            Name of this event
+        thing : str
+            Attribute of the given widget to watch
+        log_level : int
+            When the signal is triggered, a logging event of the given level
+            will be fired in the dfviz logger.
+        auto : bool
+            If True, automatically connects with a method in this class of the
+            same name.
+        """
+        if name not in self.signals:
+            raise ValueError(f"Attempt to assign an undeclared signal: {name}")
+        self._sigs[name] = {
+            "widget": widget,
+            "callbacks": [],
+            "thing": thing,
+            "log": log_level,
+        }
+        wn = "-".join(
+            [
+                getattr(widget, "name", str(widget)) if widget is not None else "none",
+                thing,
+            ]
+        )
+        self._map[wn] = name
+        if widget is not None:
+            widget.param.watch(self._signal, thing, onlychanged=True)
+        if auto and hasattr(self, name):
+            self.connect(name, getattr(self, name))
+
+    def _repr_mimebundle_(self, *args, **kwargs):
+        """Display in a notebook or a server"""
+        try:
+            return self.panel._repr_mimebundle_(*args, **kwargs)
+        except (ValueError, AttributeError) as exc:
+            raise NotImplementedError(
+                "Panel does not seem to be set up properly"
+            ) from exc
+
+    def connect(self, signal, slot):
+        """Associate call back with given event
+
+        The callback must be a function which takes the "new" value of the
+        watched attribute as the only parameter. If the callback return False,
+        this cancels any further processing of the given event.
+
+        Alternatively, the callback can be a string, in which case it means
+        emitting the correspondingly-named event (i.e., connect to self)
+        """
+        self._sigs[signal]["callbacks"].append(slot)
+
+    def _signal(self, event):
+        """This is called by a an action on a widget
+
+        Within an self.ignore_events context, nothing happens.
+
+        Tests can execute this method by directly changing the values of
+        widget components.
+        """
+        if not self._ignoring_events:
+            wn = "-".join([event.obj.name, event.name])
+            if wn in self._map and self._map[wn] in self._sigs:
+                self._emit(self._map[wn], event.new)
+
+    @contextlib.contextmanager
+    def ignore_events(self):
+        """Temporarily turn off events processing in this instance
+
+        (does not propagate to children)
+        """
+        self._ignoring_events = True
+        try:
+            yield
+        finally:
+            self._ignoring_events = False
+
+    def _emit(self, sig, value=None):
+        """An event happened, call its callbacks
+
+        This method can be used in tests to simulate message passing without
+        directly changing visual elements.
+
+        Calling of callbacks will halt whenever one returns False.
+        """
+        logger.log(self._sigs[sig]["log"], f"{sig}: {value}")
+        for callback in self._sigs[sig]["callbacks"]:
+            if isinstance(callback, str):
+                self._emit(callback)
+            else:
+                try:
+                    # running callbacks should not break the interface
+                    ret = callback(value)
+                    if ret is False:
+                        break
+                except Exception as e:
+                    logger.exception(
+                        "Exception (%s) while executing callback for signal: %s",
+                        e,
+                        sig,
+                    )
+
+    def show(self, threads=False):
+        """Open a new browser tab and display this instance's interface"""
+        self.panel.show(threads=threads, verbose=False)
+        return self
+
+
+class SingleSelect(SigSlot):
+    """A multiselect which only allows you to select one item for an event"""
+
+    signals = ["_selected", "selected"]  # the first is internal
+    slots = ["set_options", "set_selection", "add", "clear", "select"]
+
+    def __init__(self, **kwargs):
+        self.kwargs = kwargs
+        super().__init__()
+
+    def _setup(self):
+        self.panel = pn.widgets.MultiSelect(**self.kwargs)
+        self._register(self.panel, "_selected", "value")
+        self._register(None, "selected")
+        self.connect("_selected", self.select_one)
+
+    def _signal(self, *args, **kwargs):
+        super()._signal(*args, **kwargs)
+
+    def select_one(self, *_):
+        with self.ignore_events():
+            val = [self.panel.value[-1]] if self.panel.value else []
+            self.panel.value = val
+        self._emit("selected", self.panel.value)
+
+    def set_options(self, options):
+        self.panel.options = options
+
+    def clear(self):
+        self.panel.options = []
+
+    @property
+    def value(self):
+        return self.panel.value
+
+    def set_selection(self, selection):
+        self.panel.value = [selection]
+
+
+class FileSelector(SigSlot):
+    """Panel-based graphical file selector widget
+
+    Instances of this widget are interactive and can be displayed in jupyter by having
+    them as the output of a cell,  or in a separate browser tab using ``.show()``.
+    """
+
+    signals = [
+        "protocol_changed",
+        "selection_changed",
+        "directory_entered",
+        "home_clicked",
+        "up_clicked",
+        "go_clicked",
+        "filters_changed",
+    ]
+    slots = ["set_filters", "go_home"]
+
+    def __init__(self, url=None, filters=None, ignore=None, kwargs=None):
+        """
+
+        Parameters
+        ----------
+        url : str (optional)
+            Initial value of the URL to populate the dialog; should include protocol
+        filters : list(str) (optional)
+            File endings to include in the listings. If not included, all files are
+            allowed. Does not affect directories.
+            If given, the endings will appear as checkboxes in the interface
+        ignore : list(str) (optional)
+            Regex(s) of file basename patterns to ignore, e.g., "\\." for typical
+            hidden files on posix
+        kwargs : dict (optional)
+            To pass to file system instance
+        """
+        if url:
+            self.init_protocol, url = split_protocol(url)
+        else:
+            self.init_protocol, url = "file", os.getcwd()
+        self.init_url = url
+        self.init_kwargs = (kwargs if isinstance(kwargs, str) else str(kwargs)) or "{}"
+        self.filters = filters
+        self.ignore = [re.compile(i) for i in ignore or []]
+        self._fs = None
+        super().__init__()
+
+    def _setup(self):
+        self.url = pn.widgets.TextInput(
+            name="url",
+            value=self.init_url,
+            align="end",
+            sizing_mode="stretch_width",
+            width_policy="max",
+        )
+        self.protocol = pn.widgets.Select(
+            options=sorted(known_implementations),
+            value=self.init_protocol,
+            name="protocol",
+            align="center",
+        )
+        self.kwargs = pn.widgets.TextInput(
+            name="kwargs", value=self.init_kwargs, align="center"
+        )
+        self.go = pn.widgets.Button(name="⇨", align="end", width=45)
+        self.main = SingleSelect(size=10)
+        self.home = pn.widgets.Button(name="🏠", width=40, height=30, align="end")
+        self.up = pn.widgets.Button(name="‹", width=30, height=30, align="end")
+
+        self._register(self.protocol, "protocol_changed", auto=True)
+        self._register(self.go, "go_clicked", "clicks", auto=True)
+        self._register(self.up, "up_clicked", "clicks", auto=True)
+        self._register(self.home, "home_clicked", "clicks", auto=True)
+        self._register(None, "selection_changed")
+        self.main.connect("selected", self.selection_changed)
+        self._register(None, "directory_entered")
+        self.prev_protocol = self.protocol.value
+        self.prev_kwargs = self.storage_options
+
+        self.filter_sel = pn.widgets.CheckBoxGroup(
+            value=[], options=[], inline=False, align="end", width_policy="min"
+        )
+        self._register(self.filter_sel, "filters_changed", auto=True)
+
+        self.panel = pn.Column(
+            pn.Row(self.protocol, self.kwargs),
+            pn.Row(self.home, self.up, self.url, self.go, self.filter_sel),
+            self.main.panel,
+        )
+        self.set_filters(self.filters)
+        self.go_clicked()
+
+    def set_filters(self, filters=None):
+        self.filters = filters
+        if filters:
+            self.filter_sel.options = filters
+            self.filter_sel.value = filters
+        else:
+            self.filter_sel.options = []
+            self.filter_sel.value = []
+
+    @property
+    def storage_options(self):
+        """Value of the kwargs box as a dictionary"""
+        return ast.literal_eval(self.kwargs.value) or {}
+
+    @property
+    def fs(self):
+        """Current filesystem instance"""
+        if self._fs is None:
+            cls = get_filesystem_class(self.protocol.value)
+            self._fs = cls(**self.storage_options)
+        return self._fs
+
+    @property
+    def urlpath(self):
+        """URL of currently selected item"""
+        return (
+            (f"{self.protocol.value}://{self.main.value[0]}")
+            if self.main.value
+            else None
+        )
+
+    def open_file(self, mode="rb", compression=None, encoding=None):
+        """Create OpenFile instance for the currently selected item
+
+        For example, in a notebook you might do something like
+
+        .. code-block::
+
+            [ ]: sel = FileSelector(); sel
+
+            # user selects their file
+
+            [ ]: with sel.open_file('rb') as f:
+            ...      out = f.read()
+
+        Parameters
+        ----------
+        mode: str (optional)
+            Open mode for the file.
+        compression: str (optional)
+            The interact with the file as compressed. Set to 'infer' to guess
+            compression from the file ending
+        encoding: str (optional)
+            If using text mode, use this encoding; defaults to UTF8.
+        """
+        if self.urlpath is None:
+            raise ValueError("No file selected")
+        return OpenFile(self.fs, self.urlpath, mode, compression, encoding)
+
+    def filters_changed(self, values):
+        self.filters = values
+        self.go_clicked()
+
+    def selection_changed(self, *_):
+        if self.urlpath is None:
+            return
+        if self.fs.isdir(self.urlpath):
+            self.url.value = self.fs._strip_protocol(self.urlpath)
+        self.go_clicked()
+
+    def go_clicked(self, *_):
+        if (
+            self.prev_protocol != self.protocol.value
+            or self.prev_kwargs != self.storage_options
+        ):
+            self._fs = None  # causes fs to be recreated
+            self.prev_protocol = self.protocol.value
+            self.prev_kwargs = self.storage_options
+        listing = sorted(
+            self.fs.ls(self.url.value, detail=True), key=lambda x: x["name"]
+        )
+        listing = [
+            l
+            for l in listing
+            if not any(i.match(l["name"].rsplit("/", 1)[-1]) for i in self.ignore)
+        ]
+        folders = {
+            "📁 " + o["name"].rsplit("/", 1)[-1]: o["name"]
+            for o in listing
+            if o["type"] == "directory"
+        }
+        files = {
+            "📄 " + o["name"].rsplit("/", 1)[-1]: o["name"]
+            for o in listing
+            if o["type"] == "file"
+        }
+        if self.filters:
+            files = {
+                k: v
+                for k, v in files.items()
+                if any(v.endswith(ext) for ext in self.filters)
+            }
+        self.main.set_options(dict(**folders, **files))
+
+    def protocol_changed(self, *_):
+        self._fs = None
+        self.main.options = []
+        self.url.value = ""
+
+    def home_clicked(self, *_):
+        self.protocol.value = self.init_protocol
+        self.kwargs.value = self.init_kwargs
+        self.url.value = self.init_url
+        self.go_clicked()
+
+    def up_clicked(self, *_):
+        self.url.value = self.fs._parent(self.url.value)
+        self.go_clicked()

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/arrow.py

@@ -0,0 +1,307 @@
+import errno
+import io
+import os
+import secrets
+import shutil
+from contextlib import suppress
+from functools import cached_property, wraps
+from urllib.parse import parse_qs
+
+from fsspec.spec import AbstractFileSystem
+from fsspec.utils import (
+    get_package_version_without_import,
+    infer_storage_options,
+    mirror_from,
+    tokenize,
+)
+
+
+def wrap_exceptions(func):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        try:
+            return func(*args, **kwargs)
+        except OSError as exception:
+            if not exception.args:
+                raise
+
+            message, *args = exception.args
+            if isinstance(message, str) and "does not exist" in message:
+                raise FileNotFoundError(errno.ENOENT, message) from exception
+            else:
+                raise
+
+    return wrapper
+
+
+PYARROW_VERSION = None
+
+
+class ArrowFSWrapper(AbstractFileSystem):
+    """FSSpec-compatible wrapper of pyarrow.fs.FileSystem.
+
+    Parameters
+    ----------
+    fs : pyarrow.fs.FileSystem
+
+    """
+
+    root_marker = "/"
+
+    def __init__(self, fs, **kwargs):
+        global PYARROW_VERSION
+        PYARROW_VERSION = get_package_version_without_import("pyarrow")
+        self.fs = fs
+        super().__init__(**kwargs)
+
+    @property
+    def protocol(self):
+        return self.fs.type_name
+
+    @cached_property
+    def fsid(self):
+        return "hdfs_" + tokenize(self.fs.host, self.fs.port)
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        ops = infer_storage_options(path)
+        path = ops["path"]
+        if path.startswith("//"):
+            # special case for "hdfs://path" (without the triple slash)
+            path = path[1:]
+        return path
+
+    def ls(self, path, detail=False, **kwargs):
+        path = self._strip_protocol(path)
+        from pyarrow.fs import FileSelector
+
+        try:
+            entries = [
+                self._make_entry(entry)
+                for entry in self.fs.get_file_info(FileSelector(path))
+            ]
+        except (FileNotFoundError, NotADirectoryError):
+            entries = [self.info(path, **kwargs)]
+        if detail:
+            return entries
+        else:
+            return [entry["name"] for entry in entries]
+
+    def info(self, path, **kwargs):
+        path = self._strip_protocol(path)
+        [info] = self.fs.get_file_info([path])
+        return self._make_entry(info)
+
+    def exists(self, path):
+        path = self._strip_protocol(path)
+        try:
+            self.info(path)
+        except FileNotFoundError:
+            return False
+        else:
+            return True
+
+    def _make_entry(self, info):
+        from pyarrow.fs import FileType
+
+        if info.type is FileType.Directory:
+            kind = "directory"
+        elif info.type is FileType.File:
+            kind = "file"
+        elif info.type is FileType.NotFound:
+            raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), info.path)
+        else:
+            kind = "other"
+
+        return {
+            "name": info.path,
+            "size": info.size,
+            "type": kind,
+            "mtime": info.mtime,
+        }
+
+    @wrap_exceptions
+    def cp_file(self, path1, path2, **kwargs):
+        path1 = self._strip_protocol(path1).rstrip("/")
+        path2 = self._strip_protocol(path2).rstrip("/")
+
+        with self._open(path1, "rb") as lstream:
+            tmp_fname = f"{path2}.tmp.{secrets.token_hex(6)}"
+            try:
+                with self.open(tmp_fname, "wb") as rstream:
+                    shutil.copyfileobj(lstream, rstream)
+                self.fs.move(tmp_fname, path2)
+            except BaseException:
+                with suppress(FileNotFoundError):
+                    self.fs.delete_file(tmp_fname)
+                raise
+
+    @wrap_exceptions
+    def mv(self, path1, path2, **kwargs):
+        path1 = self._strip_protocol(path1).rstrip("/")
+        path2 = self._strip_protocol(path2).rstrip("/")
+        self.fs.move(path1, path2)
+
+    @wrap_exceptions
+    def rm_file(self, path):
+        path = self._strip_protocol(path)
+        self.fs.delete_file(path)
+
+    @wrap_exceptions
+    def rm(self, path, recursive=False, maxdepth=None):
+        path = self._strip_protocol(path).rstrip("/")
+        if self.isdir(path):
+            if recursive:
+                self.fs.delete_dir(path)
+            else:
+                raise ValueError("Can't delete directories without recursive=False")
+        else:
+            self.fs.delete_file(path)
+
+    @wrap_exceptions
+    def _open(self, path, mode="rb", block_size=None, seekable=True, **kwargs):
+        if mode == "rb":
+            if seekable:
+                method = self.fs.open_input_file
+            else:
+                method = self.fs.open_input_stream
+        elif mode == "wb":
+            method = self.fs.open_output_stream
+        elif mode == "ab":
+            method = self.fs.open_append_stream
+        else:
+            raise ValueError(f"unsupported mode for Arrow filesystem: {mode!r}")
+
+        _kwargs = {}
+        if mode != "rb" or not seekable:
+            if int(PYARROW_VERSION.split(".")[0]) >= 4:
+                # disable compression auto-detection
+                _kwargs["compression"] = None
+        stream = method(path, **_kwargs)
+
+        return ArrowFile(self, stream, path, mode, block_size, **kwargs)
+
+    @wrap_exceptions
+    def mkdir(self, path, create_parents=True, **kwargs):
+        path = self._strip_protocol(path)
+        if create_parents:
+            self.makedirs(path, exist_ok=True)
+        else:
+            self.fs.create_dir(path, recursive=False)
+
+    @wrap_exceptions
+    def makedirs(self, path, exist_ok=False):
+        path = self._strip_protocol(path)
+        self.fs.create_dir(path, recursive=True)
+
+    @wrap_exceptions
+    def rmdir(self, path):
+        path = self._strip_protocol(path)
+        self.fs.delete_dir(path)
+
+    @wrap_exceptions
+    def modified(self, path):
+        path = self._strip_protocol(path)
+        return self.fs.get_file_info(path).mtime
+
+    def cat_file(self, path, start=None, end=None, **kwargs):
+        kwargs["seekable"] = start not in [None, 0]
+        return super().cat_file(path, start=None, end=None, **kwargs)
+
+    def get_file(self, rpath, lpath, **kwargs):
+        kwargs["seekable"] = False
+        super().get_file(rpath, lpath, **kwargs)
+
+
+@mirror_from(
+    "stream",
+    [
+        "read",
+        "seek",
+        "tell",
+        "write",
+        "readable",
+        "writable",
+        "close",
+        "size",
+        "seekable",
+    ],
+)
+class ArrowFile(io.IOBase):
+    def __init__(self, fs, stream, path, mode, block_size=None, **kwargs):
+        self.path = path
+        self.mode = mode
+
+        self.fs = fs
+        self.stream = stream
+
+        self.blocksize = self.block_size = block_size
+        self.kwargs = kwargs
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        return self.close()
+
+
+class HadoopFileSystem(ArrowFSWrapper):
+    """A wrapper on top of the pyarrow.fs.HadoopFileSystem
+    to connect it's interface with fsspec"""
+
+    protocol = "hdfs"
+
+    def __init__(
+        self,
+        host="default",
+        port=0,
+        user=None,
+        kerb_ticket=None,
+        replication=3,
+        extra_conf=None,
+        **kwargs,
+    ):
+        """
+
+        Parameters
+        ----------
+        host: str
+            Hostname, IP or "default" to try to read from Hadoop config
+        port: int
+            Port to connect on, or default from Hadoop config if 0
+        user: str or None
+            If given, connect as this username
+        kerb_ticket: str or None
+            If given, use this ticket for authentication
+        replication: int
+            set replication factor of file for write operations. default value is 3.
+        extra_conf: None or dict
+            Passed on to HadoopFileSystem
+        """
+        from pyarrow.fs import HadoopFileSystem
+
+        fs = HadoopFileSystem(
+            host=host,
+            port=port,
+            user=user,
+            kerb_ticket=kerb_ticket,
+            replication=replication,
+            extra_conf=extra_conf,
+        )
+        super().__init__(fs=fs, **kwargs)
+
+    @staticmethod
+    def _get_kwargs_from_urls(path):
+        ops = infer_storage_options(path)
+        out = {}
+        if ops.get("host", None):
+            out["host"] = ops["host"]
+        if ops.get("username", None):
+            out["user"] = ops["username"]
+        if ops.get("port", None):
+            out["port"] = ops["port"]
+        if ops.get("url_query", None):
+            queries = parse_qs(ops["url_query"])
+            if queries.get("replication", None):
+                out["replication"] = int(queries["replication"][0])
+        return out

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/asyn_wrapper.py

@@ -0,0 +1,122 @@
+import asyncio
+import functools
+import inspect
+
+import fsspec
+from fsspec.asyn import AsyncFileSystem, running_async
+
+
+def async_wrapper(func, obj=None, semaphore=None):
+    """
+    Wraps a synchronous function to make it awaitable.
+
+    Parameters
+    ----------
+    func : callable
+        The synchronous function to wrap.
+    obj : object, optional
+        The instance to bind the function to, if applicable.
+    semaphore : asyncio.Semaphore, optional
+        A semaphore to limit concurrent calls.
+
+    Returns
+    -------
+    coroutine
+        An awaitable version of the function.
+    """
+
+    @functools.wraps(func)
+    async def wrapper(*args, **kwargs):
+        if semaphore:
+            async with semaphore:
+                return await asyncio.to_thread(func, *args, **kwargs)
+        return await asyncio.to_thread(func, *args, **kwargs)
+
+    return wrapper
+
+
+class AsyncFileSystemWrapper(AsyncFileSystem):
+    """
+    A wrapper class to convert a synchronous filesystem into an asynchronous one.
+
+    This class takes an existing synchronous filesystem implementation and wraps all
+    its methods to provide an asynchronous interface.
+
+    Parameters
+    ----------
+    sync_fs : AbstractFileSystem
+        The synchronous filesystem instance to wrap.
+    """
+
+    protocol = "asyncwrapper", "async_wrapper"
+    cachable = False
+
+    def __init__(
+        self,
+        fs=None,
+        asynchronous=None,
+        target_protocol=None,
+        target_options=None,
+        semaphore=None,
+        max_concurrent_tasks=None,
+        **kwargs,
+    ):
+        if asynchronous is None:
+            asynchronous = running_async()
+        super().__init__(asynchronous=asynchronous, **kwargs)
+        if fs is not None:
+            self.sync_fs = fs
+        else:
+            self.sync_fs = fsspec.filesystem(target_protocol, **target_options)
+        self.protocol = self.sync_fs.protocol
+        self.semaphore = semaphore
+        self._wrap_all_sync_methods()
+
+    @property
+    def fsid(self):
+        return f"async_{self.sync_fs.fsid}"
+
+    def _wrap_all_sync_methods(self):
+        """
+        Wrap all synchronous methods of the underlying filesystem with asynchronous versions.
+        """
+        excluded_methods = {"open"}
+        for method_name in dir(self.sync_fs):
+            if method_name.startswith("_") or method_name in excluded_methods:
+                continue
+
+            attr = inspect.getattr_static(self.sync_fs, method_name)
+            if isinstance(attr, property):
+                continue
+
+            method = getattr(self.sync_fs, method_name)
+            if callable(method) and not inspect.iscoroutinefunction(method):
+                async_method = async_wrapper(method, obj=self, semaphore=self.semaphore)
+                setattr(self, f"_{method_name}", async_method)
+
+    @classmethod
+    def wrap_class(cls, sync_fs_class):
+        """
+        Create a new class that can be used to instantiate an AsyncFileSystemWrapper
+        with lazy instantiation of the underlying synchronous filesystem.
+
+        Parameters
+        ----------
+        sync_fs_class : type
+            The class of the synchronous filesystem to wrap.
+
+        Returns
+        -------
+        type
+            A new class that wraps the provided synchronous filesystem class.
+        """
+
+        class GeneratedAsyncFileSystemWrapper(cls):
+            def __init__(self, *args, **kwargs):
+                sync_fs = sync_fs_class(*args, **kwargs)
+                super().__init__(sync_fs)
+
+        GeneratedAsyncFileSystemWrapper.__name__ = (
+            f"Async{sync_fs_class.__name__}Wrapper"
+        )
+        return GeneratedAsyncFileSystemWrapper

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/cache_mapper.py

@@ -0,0 +1,75 @@
+from __future__ import annotations
+
+import abc
+import hashlib
+
+from fsspec.implementations.local import make_path_posix
+
+
+class AbstractCacheMapper(abc.ABC):
+    """Abstract super-class for mappers from remote URLs to local cached
+    basenames.
+    """
+
+    @abc.abstractmethod
+    def __call__(self, path: str) -> str: ...
+
+    def __eq__(self, other: object) -> bool:
+        # Identity only depends on class. When derived classes have attributes
+        # they will need to be included.
+        return isinstance(other, type(self))
+
+    def __hash__(self) -> int:
+        # Identity only depends on class. When derived classes have attributes
+        # they will need to be included.
+        return hash(type(self))
+
+
+class BasenameCacheMapper(AbstractCacheMapper):
+    """Cache mapper that uses the basename of the remote URL and a fixed number
+    of directory levels above this.
+
+    The default is zero directory levels, meaning different paths with the same
+    basename will have the same cached basename.
+    """
+
+    def __init__(self, directory_levels: int = 0):
+        if directory_levels < 0:
+            raise ValueError(
+                "BasenameCacheMapper requires zero or positive directory_levels"
+            )
+        self.directory_levels = directory_levels
+
+        # Separator for directories when encoded as strings.
+        self._separator = "_@_"
+
+    def __call__(self, path: str) -> str:
+        path = make_path_posix(path)
+        prefix, *bits = path.rsplit("/", self.directory_levels + 1)
+        if bits:
+            return self._separator.join(bits)
+        else:
+            return prefix  # No separator found, simple filename
+
+    def __eq__(self, other: object) -> bool:
+        return super().__eq__(other) and self.directory_levels == other.directory_levels
+
+    def __hash__(self) -> int:
+        return super().__hash__() ^ hash(self.directory_levels)
+
+
+class HashCacheMapper(AbstractCacheMapper):
+    """Cache mapper that uses a hash of the remote URL."""
+
+    def __call__(self, path: str) -> str:
+        return hashlib.sha256(path.encode()).hexdigest()
+
+
+def create_cache_mapper(same_names: bool) -> AbstractCacheMapper:
+    """Factory method to create cache mapper for backward compatibility with
+    ``CachingFileSystem`` constructor using ``same_names`` kwarg.
+    """
+    if same_names:
+        return BasenameCacheMapper()
+    else:
+        return HashCacheMapper()

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/cache_metadata.py

@@ -0,0 +1,233 @@
+from __future__ import annotations
+
+import os
+import pickle
+import time
+from typing import TYPE_CHECKING
+
+from fsspec.utils import atomic_write
+
+try:
+    import ujson as json
+except ImportError:
+    if not TYPE_CHECKING:
+        import json
+
+if TYPE_CHECKING:
+    from collections.abc import Iterator
+    from typing import Any, Literal
+
+    from typing_extensions import TypeAlias
+
+    from .cached import CachingFileSystem
+
+    Detail: TypeAlias = dict[str, Any]
+
+
+class CacheMetadata:
+    """Cache metadata.
+
+    All reading and writing of cache metadata is performed by this class,
+    accessing the cached files and blocks is not.
+
+    Metadata is stored in a single file per storage directory in JSON format.
+    For backward compatibility, also reads metadata stored in pickle format
+    which is converted to JSON when next saved.
+    """
+
+    def __init__(self, storage: list[str]):
+        """
+
+        Parameters
+        ----------
+        storage: list[str]
+            Directories containing cached files, must be at least one. Metadata
+            is stored in the last of these directories by convention.
+        """
+        if not storage:
+            raise ValueError("CacheMetadata expects at least one storage location")
+
+        self._storage = storage
+        self.cached_files: list[Detail] = [{}]
+
+        # Private attribute to force saving of metadata in pickle format rather than
+        # JSON for use in tests to confirm can read both pickle and JSON formats.
+        self._force_save_pickle = False
+
+    def _load(self, fn: str) -> Detail:
+        """Low-level function to load metadata from specific file"""
+        try:
+            with open(fn, "r") as f:
+                loaded = json.load(f)
+        except ValueError:
+            with open(fn, "rb") as f:
+                loaded = pickle.load(f)
+        for c in loaded.values():
+            if isinstance(c.get("blocks"), list):
+                c["blocks"] = set(c["blocks"])
+        return loaded
+
+    def _save(self, metadata_to_save: Detail, fn: str) -> None:
+        """Low-level function to save metadata to specific file"""
+        if self._force_save_pickle:
+            with atomic_write(fn) as f:
+                pickle.dump(metadata_to_save, f)
+        else:
+            with atomic_write(fn, mode="w") as f:
+                json.dump(metadata_to_save, f)
+
+    def _scan_locations(
+        self, writable_only: bool = False
+    ) -> Iterator[tuple[str, str, bool]]:
+        """Yield locations (filenames) where metadata is stored, and whether
+        writable or not.
+
+        Parameters
+        ----------
+        writable: bool
+            Set to True to only yield writable locations.
+
+        Returns
+        -------
+        Yields (str, str, bool)
+        """
+        n = len(self._storage)
+        for i, storage in enumerate(self._storage):
+            writable = i == n - 1
+            if writable_only and not writable:
+                continue
+            yield os.path.join(storage, "cache"), storage, writable
+
+    def check_file(
+        self, path: str, cfs: CachingFileSystem | None
+    ) -> Literal[False] | tuple[Detail, str]:
+        """If path is in cache return its details, otherwise return ``False``.
+
+        If the optional CachingFileSystem is specified then it is used to
+        perform extra checks to reject possible matches, such as if they are
+        too old.
+        """
+        for (fn, base, _), cache in zip(self._scan_locations(), self.cached_files):
+            if path not in cache:
+                continue
+            detail = cache[path].copy()
+
+            if cfs is not None:
+                if cfs.check_files and detail["uid"] != cfs.fs.ukey(path):
+                    # Wrong file as determined by hash of file properties
+                    continue
+                if cfs.expiry and time.time() - detail["time"] > cfs.expiry:
+                    # Cached file has expired
+                    continue
+
+            fn = os.path.join(base, detail["fn"])
+            if os.path.exists(fn):
+                return detail, fn
+        return False
+
+    def clear_expired(self, expiry_time: int) -> tuple[list[str], bool]:
+        """Remove expired metadata from the cache.
+
+        Returns names of files corresponding to expired metadata and a boolean
+        flag indicating whether the writable cache is empty. Caller is
+        responsible for deleting the expired files.
+        """
+        expired_files = []
+        for path, detail in self.cached_files[-1].copy().items():
+            if time.time() - detail["time"] > expiry_time:
+                fn = detail.get("fn", "")
+                if not fn:
+                    raise RuntimeError(
+                        f"Cache metadata does not contain 'fn' for {path}"
+                    )
+                fn = os.path.join(self._storage[-1], fn)
+                expired_files.append(fn)
+                self.cached_files[-1].pop(path)
+
+        if self.cached_files[-1]:
+            cache_path = os.path.join(self._storage[-1], "cache")
+            self._save(self.cached_files[-1], cache_path)
+
+        writable_cache_empty = not self.cached_files[-1]
+        return expired_files, writable_cache_empty
+
+    def load(self) -> None:
+        """Load all metadata from disk and store in ``self.cached_files``"""
+        cached_files = []
+        for fn, _, _ in self._scan_locations():
+            if os.path.exists(fn):
+                # TODO: consolidate blocks here
+                cached_files.append(self._load(fn))
+            else:
+                cached_files.append({})
+        self.cached_files = cached_files or [{}]
+
+    def on_close_cached_file(self, f: Any, path: str) -> None:
+        """Perform side-effect actions on closing a cached file.
+
+        The actual closing of the file is the responsibility of the caller.
+        """
+        # File must be writeble, so in self.cached_files[-1]
+        c = self.cached_files[-1][path]
+        if c["blocks"] is not True and len(c["blocks"]) * f.blocksize >= f.size:
+            c["blocks"] = True
+
+    def pop_file(self, path: str) -> str | None:
+        """Remove metadata of cached file.
+
+        If path is in the cache, return the filename of the cached file,
+        otherwise return ``None``.  Caller is responsible for deleting the
+        cached file.
+        """
+        details = self.check_file(path, None)
+        if not details:
+            return None
+        _, fn = details
+        if fn.startswith(self._storage[-1]):
+            self.cached_files[-1].pop(path)
+            self.save()
+        else:
+            raise PermissionError(
+                "Can only delete cached file in last, writable cache location"
+            )
+        return fn
+
+    def save(self) -> None:
+        """Save metadata to disk"""
+        for (fn, _, writable), cache in zip(self._scan_locations(), self.cached_files):
+            if not writable:
+                continue
+
+            if os.path.exists(fn):
+                cached_files = self._load(fn)
+                for k, c in cached_files.items():
+                    if k in cache:
+                        if c["blocks"] is True or cache[k]["blocks"] is True:
+                            c["blocks"] = True
+                        else:
+                            # self.cached_files[*][*]["blocks"] must continue to
+                            # point to the same set object so that updates
+                            # performed by MMapCache are propagated back to
+                            # self.cached_files.
+                            blocks = cache[k]["blocks"]
+                            blocks.update(c["blocks"])
+                            c["blocks"] = blocks
+                        c["time"] = max(c["time"], cache[k]["time"])
+                        c["uid"] = cache[k]["uid"]
+
+                # Files can be added to cache after it was written once
+                for k, c in cache.items():
+                    if k not in cached_files:
+                        cached_files[k] = c
+            else:
+                cached_files = cache
+            cache = {k: v.copy() for k, v in cached_files.items()}
+            for c in cache.values():
+                if isinstance(c["blocks"], set):
+                    c["blocks"] = list(c["blocks"])
+            self._save(cache, fn)
+            self.cached_files[-1] = cached_files
+
+    def update_file(self, path: str, detail: Detail) -> None:
+        """Update metadata for specific file in memory, do not save"""
+        self.cached_files[-1][path] = detail

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/chained.py

@@ -0,0 +1,23 @@
+from typing import ClassVar
+
+from fsspec import AbstractFileSystem
+
+__all__ = ("ChainedFileSystem",)
+
+
+class ChainedFileSystem(AbstractFileSystem):
+    """Chained filesystem base class.
+
+    A chained filesystem is designed to be layered over another FS.
+    This is useful to implement things like caching.
+
+    This base class does very little on its own, but is used as a marker
+    that the class is designed for chaining.
+
+    Right now this is only used in `url_to_fs` to provide the path argument
+    (`fo`) to the chained filesystem from the underlying filesystem.
+
+    Additional functionality may be added in the future.
+    """
+
+    protocol: ClassVar[str] = "chained"

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/dask.py

@@ -0,0 +1,152 @@
+import dask
+from distributed.client import Client, _get_global_client
+from distributed.worker import Worker
+
+from fsspec import filesystem
+from fsspec.spec import AbstractBufferedFile, AbstractFileSystem
+from fsspec.utils import infer_storage_options
+
+
+def _get_client(client):
+    if client is None:
+        return _get_global_client()
+    elif isinstance(client, Client):
+        return client
+    else:
+        # e.g., connection string
+        return Client(client)
+
+
+def _in_worker():
+    return bool(Worker._instances)
+
+
+class DaskWorkerFileSystem(AbstractFileSystem):
+    """View files accessible to a worker as any other remote file-system
+
+    When instances are run on the worker, uses the real filesystem. When
+    run on the client, they call the worker to provide information or data.
+
+    **Warning** this implementation is experimental, and read-only for now.
+    """
+
+    def __init__(
+        self, target_protocol=None, target_options=None, fs=None, client=None, **kwargs
+    ):
+        super().__init__(**kwargs)
+        if not (fs is None) ^ (target_protocol is None):
+            raise ValueError(
+                "Please provide one of filesystem instance (fs) or"
+                " target_protocol, not both"
+            )
+        self.target_protocol = target_protocol
+        self.target_options = target_options
+        self.worker = None
+        self.client = client
+        self.fs = fs
+        self._determine_worker()
+
+    @staticmethod
+    def _get_kwargs_from_urls(path):
+        so = infer_storage_options(path)
+        if "host" in so and "port" in so:
+            return {"client": f"{so['host']}:{so['port']}"}
+        else:
+            return {}
+
+    def _determine_worker(self):
+        if _in_worker():
+            self.worker = True
+            if self.fs is None:
+                self.fs = filesystem(
+                    self.target_protocol, **(self.target_options or {})
+                )
+        else:
+            self.worker = False
+            self.client = _get_client(self.client)
+            self.rfs = dask.delayed(self)
+
+    def mkdir(self, *args, **kwargs):
+        if self.worker:
+            self.fs.mkdir(*args, **kwargs)
+        else:
+            self.rfs.mkdir(*args, **kwargs).compute()
+
+    def rm(self, *args, **kwargs):
+        if self.worker:
+            self.fs.rm(*args, **kwargs)
+        else:
+            self.rfs.rm(*args, **kwargs).compute()
+
+    def copy(self, *args, **kwargs):
+        if self.worker:
+            self.fs.copy(*args, **kwargs)
+        else:
+            self.rfs.copy(*args, **kwargs).compute()
+
+    def mv(self, *args, **kwargs):
+        if self.worker:
+            self.fs.mv(*args, **kwargs)
+        else:
+            self.rfs.mv(*args, **kwargs).compute()
+
+    def ls(self, *args, **kwargs):
+        if self.worker:
+            return self.fs.ls(*args, **kwargs)
+        else:
+            return self.rfs.ls(*args, **kwargs).compute()
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=True,
+        cache_options=None,
+        **kwargs,
+    ):
+        if self.worker:
+            return self.fs._open(
+                path,
+                mode=mode,
+                block_size=block_size,
+                autocommit=autocommit,
+                cache_options=cache_options,
+                **kwargs,
+            )
+        else:
+            return DaskFile(
+                fs=self,
+                path=path,
+                mode=mode,
+                block_size=block_size,
+                autocommit=autocommit,
+                cache_options=cache_options,
+                **kwargs,
+            )
+
+    def fetch_range(self, path, mode, start, end):
+        if self.worker:
+            with self._open(path, mode) as f:
+                f.seek(start)
+                return f.read(end - start)
+        else:
+            return self.rfs.fetch_range(path, mode, start, end).compute()
+
+
+class DaskFile(AbstractBufferedFile):
+    def __init__(self, mode="rb", **kwargs):
+        if mode != "rb":
+            raise ValueError('Remote dask files can only be opened in "rb" mode')
+        super().__init__(**kwargs)
+
+    def _upload_chunk(self, final=False):
+        pass
+
+    def _initiate_upload(self):
+        """Create remote file/upload"""
+        pass
+
+    def _fetch_range(self, start, end):
+        """Get the specified set of bytes from remote"""
+        return self.fs.fetch_range(self.path, self.mode, start, end)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/data.py

@@ -0,0 +1,58 @@
+import base64
+import io
+from typing import Optional
+from urllib.parse import unquote
+
+from fsspec import AbstractFileSystem
+
+
+class DataFileSystem(AbstractFileSystem):
+    """A handy decoder for data-URLs
+
+    Example
+    -------
+    >>> with fsspec.open("data:,Hello%2C%20World%21") as f:
+    ...     print(f.read())
+    b"Hello, World!"
+
+    See https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs
+    """
+
+    protocol = "data"
+
+    def __init__(self, **kwargs):
+        """No parameters for this filesystem"""
+        super().__init__(**kwargs)
+
+    def cat_file(self, path, start=None, end=None, **kwargs):
+        pref, data = path.split(",", 1)
+        if pref.endswith("base64"):
+            return base64.b64decode(data)[start:end]
+        return unquote(data).encode()[start:end]
+
+    def info(self, path, **kwargs):
+        pref, name = path.split(",", 1)
+        data = self.cat_file(path)
+        mime = pref.split(":", 1)[1].split(";", 1)[0]
+        return {"name": name, "size": len(data), "type": "file", "mimetype": mime}
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=True,
+        cache_options=None,
+        **kwargs,
+    ):
+        if "r" not in mode:
+            raise ValueError("Read only filesystem")
+        return io.BytesIO(self.cat_file(path))
+
+    @staticmethod
+    def encode(data: bytes, mime: Optional[str] = None):
+        """Format the given data into data-URL syntax
+
+        This version always base64 encodes, even when the data is ascii/url-safe.
+        """
+        return f"data:{mime or ''};base64,{base64.b64encode(data).decode()}"

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/dbfs.py

@@ -0,0 +1,496 @@
+from __future__ import annotations
+
+import base64
+import urllib
+
+import requests
+from requests.adapters import HTTPAdapter, Retry
+from typing_extensions import override
+
+from fsspec import AbstractFileSystem
+from fsspec.spec import AbstractBufferedFile
+
+
+class DatabricksException(Exception):
+    """
+    Helper class for exceptions raised in this module.
+    """
+
+    def __init__(self, error_code, message, details=None):
+        """Create a new DatabricksException"""
+        super().__init__(message)
+
+        self.error_code = error_code
+        self.message = message
+        self.details = details
+
+
+class DatabricksFileSystem(AbstractFileSystem):
+    """
+    Get access to the Databricks filesystem implementation over HTTP.
+    Can be used inside and outside of a databricks cluster.
+    """
+
+    def __init__(self, instance, token, **kwargs):
+        """
+        Create a new DatabricksFileSystem.
+
+        Parameters
+        ----------
+        instance: str
+            The instance URL of the databricks cluster.
+            For example for an Azure databricks cluster, this
+            has the form adb-<some-number>.<two digits>.azuredatabricks.net.
+        token: str
+            Your personal token. Find out more
+            here: https://docs.databricks.com/dev-tools/api/latest/authentication.html
+        """
+        self.instance = instance
+        self.token = token
+        self.session = requests.Session()
+        self.retries = Retry(
+            total=10,
+            backoff_factor=0.05,
+            status_forcelist=[408, 429, 500, 502, 503, 504],
+        )
+
+        self.session.mount("https://", HTTPAdapter(max_retries=self.retries))
+        self.session.headers.update({"Authorization": f"Bearer {self.token}"})
+
+        super().__init__(**kwargs)
+
+    @override
+    def _ls_from_cache(self, path) -> list[dict[str, str | int]] | None:
+        """Check cache for listing
+
+        Returns listing, if found (may be empty list for a directory that
+        exists but contains nothing), None if not in cache.
+        """
+        self.dircache.pop(path.rstrip("/"), None)
+
+        parent = self._parent(path)
+        if parent in self.dircache:
+            for entry in self.dircache[parent]:
+                if entry["name"] == path.rstrip("/"):
+                    if entry["type"] != "directory":
+                        return [entry]
+                    return []
+            raise FileNotFoundError(path)
+
+    def ls(self, path, detail=True, **kwargs):
+        """
+        List the contents of the given path.
+
+        Parameters
+        ----------
+        path: str
+            Absolute path
+        detail: bool
+            Return not only the list of filenames,
+            but also additional information on file sizes
+            and types.
+        """
+        try:
+            out = self._ls_from_cache(path)
+        except FileNotFoundError:
+            # This happens if the `path`'s parent was cached, but `path` is not
+            # there. This suggests that `path` is new since the parent was
+            # cached. Attempt to invalidate parent's cache before continuing.
+            self.dircache.pop(self._parent(path), None)
+            out = None
+
+        if not out:
+            try:
+                r = self._send_to_api(
+                    method="get", endpoint="list", json={"path": path}
+                )
+            except DatabricksException as e:
+                if e.error_code == "RESOURCE_DOES_NOT_EXIST":
+                    raise FileNotFoundError(e.message) from e
+
+                raise
+            files = r.get("files", [])
+            out = [
+                {
+                    "name": o["path"],
+                    "type": "directory" if o["is_dir"] else "file",
+                    "size": o["file_size"],
+                }
+                for o in files
+            ]
+            self.dircache[path] = out
+
+        if detail:
+            return out
+        return [o["name"] for o in out]
+
+    def makedirs(self, path, exist_ok=True):
+        """
+        Create a given absolute path and all of its parents.
+
+        Parameters
+        ----------
+        path: str
+            Absolute path to create
+        exist_ok: bool
+            If false, checks if the folder
+            exists before creating it (and raises an
+            Exception if this is the case)
+        """
+        if not exist_ok:
+            try:
+                # If the following succeeds, the path is already present
+                self._send_to_api(
+                    method="get", endpoint="get-status", json={"path": path}
+                )
+                raise FileExistsError(f"Path {path} already exists")
+            except DatabricksException as e:
+                if e.error_code == "RESOURCE_DOES_NOT_EXIST":
+                    pass
+
+        try:
+            self._send_to_api(method="post", endpoint="mkdirs", json={"path": path})
+        except DatabricksException as e:
+            if e.error_code == "RESOURCE_ALREADY_EXISTS":
+                raise FileExistsError(e.message) from e
+
+            raise
+        self.invalidate_cache(self._parent(path))
+
+    def mkdir(self, path, create_parents=True, **kwargs):
+        """
+        Create a given absolute path and all of its parents.
+
+        Parameters
+        ----------
+        path: str
+            Absolute path to create
+        create_parents: bool
+            Whether to create all parents or not.
+            "False" is not implemented so far.
+        """
+        if not create_parents:
+            raise NotImplementedError
+
+        self.mkdirs(path, **kwargs)
+
+    def rm(self, path, recursive=False, **kwargs):
+        """
+        Remove the file or folder at the given absolute path.
+
+        Parameters
+        ----------
+        path: str
+            Absolute path what to remove
+        recursive: bool
+            Recursively delete all files in a folder.
+        """
+        try:
+            self._send_to_api(
+                method="post",
+                endpoint="delete",
+                json={"path": path, "recursive": recursive},
+            )
+        except DatabricksException as e:
+            # This is not really an exception, it just means
+            # not everything was deleted so far
+            if e.error_code == "PARTIAL_DELETE":
+                self.rm(path=path, recursive=recursive)
+            elif e.error_code == "IO_ERROR":
+                # Using the same exception as the os module would use here
+                raise OSError(e.message) from e
+
+            raise
+        self.invalidate_cache(self._parent(path))
+
+    def mv(
+        self, source_path, destination_path, recursive=False, maxdepth=None, **kwargs
+    ):
+        """
+        Move a source to a destination path.
+
+        A note from the original [databricks API manual]
+        (https://docs.databricks.com/dev-tools/api/latest/dbfs.html#move).
+
+        When moving a large number of files the API call will time out after
+        approximately 60s, potentially resulting in partially moved data.
+        Therefore, for operations that move more than 10k files, we strongly
+        discourage using the DBFS REST API.
+
+        Parameters
+        ----------
+        source_path: str
+            From where to move (absolute path)
+        destination_path: str
+            To where to move (absolute path)
+        recursive: bool
+            Not implemented to far.
+        maxdepth:
+            Not implemented to far.
+        """
+        if recursive:
+            raise NotImplementedError
+        if maxdepth:
+            raise NotImplementedError
+
+        try:
+            self._send_to_api(
+                method="post",
+                endpoint="move",
+                json={"source_path": source_path, "destination_path": destination_path},
+            )
+        except DatabricksException as e:
+            if e.error_code == "RESOURCE_DOES_NOT_EXIST":
+                raise FileNotFoundError(e.message) from e
+            elif e.error_code == "RESOURCE_ALREADY_EXISTS":
+                raise FileExistsError(e.message) from e
+
+            raise
+        self.invalidate_cache(self._parent(source_path))
+        self.invalidate_cache(self._parent(destination_path))
+
+    def _open(self, path, mode="rb", block_size="default", **kwargs):
+        """
+        Overwrite the base class method to make sure to create a DBFile.
+        All arguments are copied from the base method.
+
+        Only the default blocksize is allowed.
+        """
+        return DatabricksFile(self, path, mode=mode, block_size=block_size, **kwargs)
+
+    def _send_to_api(self, method, endpoint, json):
+        """
+        Send the given json to the DBFS API
+        using a get or post request (specified by the argument `method`).
+
+        Parameters
+        ----------
+        method: str
+            Which http method to use for communication; "get" or "post".
+        endpoint: str
+            Where to send the request to (last part of the API URL)
+        json: dict
+            Dictionary of information to send
+        """
+        if method == "post":
+            session_call = self.session.post
+        elif method == "get":
+            session_call = self.session.get
+        else:
+            raise ValueError(f"Do not understand method {method}")
+
+        url = urllib.parse.urljoin(f"https://{self.instance}/api/2.0/dbfs/", endpoint)
+
+        r = session_call(url, json=json)
+
+        # The DBFS API will return a json, also in case of an exception.
+        # We want to preserve this information as good as possible.
+        try:
+            r.raise_for_status()
+        except requests.HTTPError as e:
+            # try to extract json error message
+            # if that fails, fall back to the original exception
+            try:
+                exception_json = e.response.json()
+            except Exception:
+                raise e from None
+
+            raise DatabricksException(**exception_json) from e
+
+        return r.json()
+
+    def _create_handle(self, path, overwrite=True):
+        """
+        Internal function to create a handle, which can be used to
+        write blocks of a file to DBFS.
+        A handle has a unique identifier which needs to be passed
+        whenever written during this transaction.
+        The handle is active for 10 minutes - after that a new
+        write transaction needs to be created.
+        Make sure to close the handle after you are finished.
+
+        Parameters
+        ----------
+        path: str
+            Absolute path for this file.
+        overwrite: bool
+            If a file already exist at this location, either overwrite
+            it or raise an exception.
+        """
+        try:
+            r = self._send_to_api(
+                method="post",
+                endpoint="create",
+                json={"path": path, "overwrite": overwrite},
+            )
+            return r["handle"]
+        except DatabricksException as e:
+            if e.error_code == "RESOURCE_ALREADY_EXISTS":
+                raise FileExistsError(e.message) from e
+
+            raise
+
+    def _close_handle(self, handle):
+        """
+        Close a handle, which was opened by :func:`_create_handle`.
+
+        Parameters
+        ----------
+        handle: str
+            Which handle to close.
+        """
+        try:
+            self._send_to_api(method="post", endpoint="close", json={"handle": handle})
+        except DatabricksException as e:
+            if e.error_code == "RESOURCE_DOES_NOT_EXIST":
+                raise FileNotFoundError(e.message) from e
+
+            raise
+
+    def _add_data(self, handle, data):
+        """
+        Upload data to an already opened file handle
+        (opened by :func:`_create_handle`).
+        The maximal allowed data size is 1MB after
+        conversion to base64.
+        Remember to close the handle when you are finished.
+
+        Parameters
+        ----------
+        handle: str
+            Which handle to upload data to.
+        data: bytes
+            Block of data to add to the handle.
+        """
+        data = base64.b64encode(data).decode()
+        try:
+            self._send_to_api(
+                method="post",
+                endpoint="add-block",
+                json={"handle": handle, "data": data},
+            )
+        except DatabricksException as e:
+            if e.error_code == "RESOURCE_DOES_NOT_EXIST":
+                raise FileNotFoundError(e.message) from e
+            elif e.error_code == "MAX_BLOCK_SIZE_EXCEEDED":
+                raise ValueError(e.message) from e
+
+            raise
+
+    def _get_data(self, path, start, end):
+        """
+        Download data in bytes from a given absolute path in a block
+        from [start, start+length].
+        The maximum number of allowed bytes to read is 1MB.
+
+        Parameters
+        ----------
+        path: str
+            Absolute path to download data from
+        start: int
+            Start position of the block
+        end: int
+            End position of the block
+        """
+        try:
+            r = self._send_to_api(
+                method="get",
+                endpoint="read",
+                json={"path": path, "offset": start, "length": end - start},
+            )
+            return base64.b64decode(r["data"])
+        except DatabricksException as e:
+            if e.error_code == "RESOURCE_DOES_NOT_EXIST":
+                raise FileNotFoundError(e.message) from e
+            elif e.error_code in ["INVALID_PARAMETER_VALUE", "MAX_READ_SIZE_EXCEEDED"]:
+                raise ValueError(e.message) from e
+
+            raise
+
+    def invalidate_cache(self, path=None):
+        if path is None:
+            self.dircache.clear()
+        else:
+            self.dircache.pop(path, None)
+        super().invalidate_cache(path)
+
+
+class DatabricksFile(AbstractBufferedFile):
+    """
+    Helper class for files referenced in the DatabricksFileSystem.
+    """
+
+    DEFAULT_BLOCK_SIZE = 1 * 2**20  # only allowed block size
+
+    def __init__(
+        self,
+        fs,
+        path,
+        mode="rb",
+        block_size="default",
+        autocommit=True,
+        cache_type="readahead",
+        cache_options=None,
+        **kwargs,
+    ):
+        """
+        Create a new instance of the DatabricksFile.
+
+        The blocksize needs to be the default one.
+        """
+        if block_size is None or block_size == "default":
+            block_size = self.DEFAULT_BLOCK_SIZE
+
+        assert block_size == self.DEFAULT_BLOCK_SIZE, (
+            f"Only the default block size is allowed, not {block_size}"
+        )
+
+        super().__init__(
+            fs,
+            path,
+            mode=mode,
+            block_size=block_size,
+            autocommit=autocommit,
+            cache_type=cache_type,
+            cache_options=cache_options or {},
+            **kwargs,
+        )
+
+    def _initiate_upload(self):
+        """Internal function to start a file upload"""
+        self.handle = self.fs._create_handle(self.path)
+
+    def _upload_chunk(self, final=False):
+        """Internal function to add a chunk of data to a started upload"""
+        self.buffer.seek(0)
+        data = self.buffer.getvalue()
+
+        data_chunks = [
+            data[start:end] for start, end in self._to_sized_blocks(len(data))
+        ]
+
+        for data_chunk in data_chunks:
+            self.fs._add_data(handle=self.handle, data=data_chunk)
+
+        if final:
+            self.fs._close_handle(handle=self.handle)
+            return True
+
+    def _fetch_range(self, start, end):
+        """Internal function to download a block of data"""
+        return_buffer = b""
+        length = end - start
+        for chunk_start, chunk_end in self._to_sized_blocks(length, start):
+            return_buffer += self.fs._get_data(
+                path=self.path, start=chunk_start, end=chunk_end
+            )
+
+        return return_buffer
+
+    def _to_sized_blocks(self, length, start=0):
+        """Helper function to split a range from 0 to total_length into blocksizes"""
+        end = start + length
+        for data_chunk in range(start, end, self.blocksize):
+            data_start = data_chunk
+            data_end = min(end, data_chunk + self.blocksize)
+            yield data_start, data_end

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/dirfs.py

@@ -0,0 +1,388 @@
+from .. import filesystem
+from ..asyn import AsyncFileSystem
+
+
+class DirFileSystem(AsyncFileSystem):
+    """Directory prefix filesystem
+
+    The DirFileSystem is a filesystem-wrapper. It assumes every path it is dealing with
+    is relative to the `path`. After performing the necessary paths operation it
+    delegates everything to the wrapped filesystem.
+    """
+
+    protocol = "dir"
+
+    def __init__(
+        self,
+        path=None,
+        fs=None,
+        fo=None,
+        target_protocol=None,
+        target_options=None,
+        **storage_options,
+    ):
+        """
+        Parameters
+        ----------
+        path: str
+            Path to the directory.
+        fs: AbstractFileSystem
+            An instantiated filesystem to wrap.
+        target_protocol, target_options:
+            if fs is none, construct it from these
+        fo: str
+            Alternate for path; do not provide both
+        """
+        super().__init__(**storage_options)
+        if fs is None:
+            fs = filesystem(protocol=target_protocol, **(target_options or {}))
+        path = path or fo
+
+        if self.asynchronous and not fs.async_impl:
+            raise ValueError("can't use asynchronous with non-async fs")
+
+        if fs.async_impl and self.asynchronous != fs.asynchronous:
+            raise ValueError("both dirfs and fs should be in the same sync/async mode")
+
+        self.path = fs._strip_protocol(path)
+        self.fs = fs
+
+    def _join(self, path):
+        if isinstance(path, str):
+            if not self.path:
+                return path
+            if not path:
+                return self.path
+            return self.fs.sep.join((self.path, self._strip_protocol(path)))
+        if isinstance(path, dict):
+            return {self._join(_path): value for _path, value in path.items()}
+        return [self._join(_path) for _path in path]
+
+    def _relpath(self, path):
+        if isinstance(path, str):
+            if not self.path:
+                return path
+            # We need to account for S3FileSystem returning paths that do not
+            # start with a '/'
+            if path == self.path or (
+                self.path.startswith(self.fs.sep) and path == self.path[1:]
+            ):
+                return ""
+            prefix = self.path + self.fs.sep
+            if self.path.startswith(self.fs.sep) and not path.startswith(self.fs.sep):
+                prefix = prefix[1:]
+            assert path.startswith(prefix)
+            return path[len(prefix) :]
+        return [self._relpath(_path) for _path in path]
+
+    # Wrappers below
+
+    @property
+    def sep(self):
+        return self.fs.sep
+
+    async def set_session(self, *args, **kwargs):
+        return await self.fs.set_session(*args, **kwargs)
+
+    async def _rm_file(self, path, **kwargs):
+        return await self.fs._rm_file(self._join(path), **kwargs)
+
+    def rm_file(self, path, **kwargs):
+        return self.fs.rm_file(self._join(path), **kwargs)
+
+    async def _rm(self, path, *args, **kwargs):
+        return await self.fs._rm(self._join(path), *args, **kwargs)
+
+    def rm(self, path, *args, **kwargs):
+        return self.fs.rm(self._join(path), *args, **kwargs)
+
+    async def _cp_file(self, path1, path2, **kwargs):
+        return await self.fs._cp_file(self._join(path1), self._join(path2), **kwargs)
+
+    def cp_file(self, path1, path2, **kwargs):
+        return self.fs.cp_file(self._join(path1), self._join(path2), **kwargs)
+
+    async def _copy(
+        self,
+        path1,
+        path2,
+        *args,
+        **kwargs,
+    ):
+        return await self.fs._copy(
+            self._join(path1),
+            self._join(path2),
+            *args,
+            **kwargs,
+        )
+
+    def copy(self, path1, path2, *args, **kwargs):
+        return self.fs.copy(
+            self._join(path1),
+            self._join(path2),
+            *args,
+            **kwargs,
+        )
+
+    async def _pipe(self, path, *args, **kwargs):
+        return await self.fs._pipe(self._join(path), *args, **kwargs)
+
+    def pipe(self, path, *args, **kwargs):
+        return self.fs.pipe(self._join(path), *args, **kwargs)
+
+    async def _pipe_file(self, path, *args, **kwargs):
+        return await self.fs._pipe_file(self._join(path), *args, **kwargs)
+
+    def pipe_file(self, path, *args, **kwargs):
+        return self.fs.pipe_file(self._join(path), *args, **kwargs)
+
+    async def _cat_file(self, path, *args, **kwargs):
+        return await self.fs._cat_file(self._join(path), *args, **kwargs)
+
+    def cat_file(self, path, *args, **kwargs):
+        return self.fs.cat_file(self._join(path), *args, **kwargs)
+
+    async def _cat(self, path, *args, **kwargs):
+        ret = await self.fs._cat(
+            self._join(path),
+            *args,
+            **kwargs,
+        )
+
+        if isinstance(ret, dict):
+            return {self._relpath(key): value for key, value in ret.items()}
+
+        return ret
+
+    def cat(self, path, *args, **kwargs):
+        ret = self.fs.cat(
+            self._join(path),
+            *args,
+            **kwargs,
+        )
+
+        if isinstance(ret, dict):
+            return {self._relpath(key): value for key, value in ret.items()}
+
+        return ret
+
+    async def _put_file(self, lpath, rpath, **kwargs):
+        return await self.fs._put_file(lpath, self._join(rpath), **kwargs)
+
+    def put_file(self, lpath, rpath, **kwargs):
+        return self.fs.put_file(lpath, self._join(rpath), **kwargs)
+
+    async def _put(
+        self,
+        lpath,
+        rpath,
+        *args,
+        **kwargs,
+    ):
+        return await self.fs._put(
+            lpath,
+            self._join(rpath),
+            *args,
+            **kwargs,
+        )
+
+    def put(self, lpath, rpath, *args, **kwargs):
+        return self.fs.put(
+            lpath,
+            self._join(rpath),
+            *args,
+            **kwargs,
+        )
+
+    async def _get_file(self, rpath, lpath, **kwargs):
+        return await self.fs._get_file(self._join(rpath), lpath, **kwargs)
+
+    def get_file(self, rpath, lpath, **kwargs):
+        return self.fs.get_file(self._join(rpath), lpath, **kwargs)
+
+    async def _get(self, rpath, *args, **kwargs):
+        return await self.fs._get(self._join(rpath), *args, **kwargs)
+
+    def get(self, rpath, *args, **kwargs):
+        return self.fs.get(self._join(rpath), *args, **kwargs)
+
+    async def _isfile(self, path):
+        return await self.fs._isfile(self._join(path))
+
+    def isfile(self, path):
+        return self.fs.isfile(self._join(path))
+
+    async def _isdir(self, path):
+        return await self.fs._isdir(self._join(path))
+
+    def isdir(self, path):
+        return self.fs.isdir(self._join(path))
+
+    async def _size(self, path):
+        return await self.fs._size(self._join(path))
+
+    def size(self, path):
+        return self.fs.size(self._join(path))
+
+    async def _exists(self, path):
+        return await self.fs._exists(self._join(path))
+
+    def exists(self, path):
+        return self.fs.exists(self._join(path))
+
+    async def _info(self, path, **kwargs):
+        info = await self.fs._info(self._join(path), **kwargs)
+        info = info.copy()
+        info["name"] = self._relpath(info["name"])
+        return info
+
+    def info(self, path, **kwargs):
+        info = self.fs.info(self._join(path), **kwargs)
+        info = info.copy()
+        info["name"] = self._relpath(info["name"])
+        return info
+
+    async def _ls(self, path, detail=True, **kwargs):
+        ret = (await self.fs._ls(self._join(path), detail=detail, **kwargs)).copy()
+        if detail:
+            out = []
+            for entry in ret:
+                entry = entry.copy()
+                entry["name"] = self._relpath(entry["name"])
+                out.append(entry)
+            return out
+
+        return self._relpath(ret)
+
+    def ls(self, path, detail=True, **kwargs):
+        ret = self.fs.ls(self._join(path), detail=detail, **kwargs).copy()
+        if detail:
+            out = []
+            for entry in ret:
+                entry = entry.copy()
+                entry["name"] = self._relpath(entry["name"])
+                out.append(entry)
+            return out
+
+        return self._relpath(ret)
+
+    async def _walk(self, path, *args, **kwargs):
+        async for root, dirs, files in self.fs._walk(self._join(path), *args, **kwargs):
+            yield self._relpath(root), dirs, files
+
+    def walk(self, path, *args, **kwargs):
+        for root, dirs, files in self.fs.walk(self._join(path), *args, **kwargs):
+            yield self._relpath(root), dirs, files
+
+    async def _glob(self, path, **kwargs):
+        detail = kwargs.get("detail", False)
+        ret = await self.fs._glob(self._join(path), **kwargs)
+        if detail:
+            return {self._relpath(path): info for path, info in ret.items()}
+        return self._relpath(ret)
+
+    def glob(self, path, **kwargs):
+        detail = kwargs.get("detail", False)
+        ret = self.fs.glob(self._join(path), **kwargs)
+        if detail:
+            return {self._relpath(path): info for path, info in ret.items()}
+        return self._relpath(ret)
+
+    async def _du(self, path, *args, **kwargs):
+        total = kwargs.get("total", True)
+        ret = await self.fs._du(self._join(path), *args, **kwargs)
+        if total:
+            return ret
+
+        return {self._relpath(path): size for path, size in ret.items()}
+
+    def du(self, path, *args, **kwargs):
+        total = kwargs.get("total", True)
+        ret = self.fs.du(self._join(path), *args, **kwargs)
+        if total:
+            return ret
+
+        return {self._relpath(path): size for path, size in ret.items()}
+
+    async def _find(self, path, *args, **kwargs):
+        detail = kwargs.get("detail", False)
+        ret = await self.fs._find(self._join(path), *args, **kwargs)
+        if detail:
+            return {self._relpath(path): info for path, info in ret.items()}
+        return self._relpath(ret)
+
+    def find(self, path, *args, **kwargs):
+        detail = kwargs.get("detail", False)
+        ret = self.fs.find(self._join(path), *args, **kwargs)
+        if detail:
+            return {self._relpath(path): info for path, info in ret.items()}
+        return self._relpath(ret)
+
+    async def _expand_path(self, path, *args, **kwargs):
+        return self._relpath(
+            await self.fs._expand_path(self._join(path), *args, **kwargs)
+        )
+
+    def expand_path(self, path, *args, **kwargs):
+        return self._relpath(self.fs.expand_path(self._join(path), *args, **kwargs))
+
+    async def _mkdir(self, path, *args, **kwargs):
+        return await self.fs._mkdir(self._join(path), *args, **kwargs)
+
+    def mkdir(self, path, *args, **kwargs):
+        return self.fs.mkdir(self._join(path), *args, **kwargs)
+
+    async def _makedirs(self, path, *args, **kwargs):
+        return await self.fs._makedirs(self._join(path), *args, **kwargs)
+
+    def makedirs(self, path, *args, **kwargs):
+        return self.fs.makedirs(self._join(path), *args, **kwargs)
+
+    def rmdir(self, path):
+        return self.fs.rmdir(self._join(path))
+
+    def mv(self, path1, path2, **kwargs):
+        return self.fs.mv(
+            self._join(path1),
+            self._join(path2),
+            **kwargs,
+        )
+
+    def touch(self, path, **kwargs):
+        return self.fs.touch(self._join(path), **kwargs)
+
+    def created(self, path):
+        return self.fs.created(self._join(path))
+
+    def modified(self, path):
+        return self.fs.modified(self._join(path))
+
+    def sign(self, path, *args, **kwargs):
+        return self.fs.sign(self._join(path), *args, **kwargs)
+
+    def __repr__(self):
+        return f"{self.__class__.__qualname__}(path='{self.path}', fs={self.fs})"
+
+    def open(
+        self,
+        path,
+        *args,
+        **kwargs,
+    ):
+        return self.fs.open(
+            self._join(path),
+            *args,
+            **kwargs,
+        )
+
+    async def open_async(
+        self,
+        path,
+        *args,
+        **kwargs,
+    ):
+        return await self.fs.open_async(
+            self._join(path),
+            *args,
+            **kwargs,
+        )

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/ftp.py

@@ -0,0 +1,387 @@
+import os
+import uuid
+from ftplib import FTP, FTP_TLS, Error, error_perm
+from typing import Any
+
+from ..spec import AbstractBufferedFile, AbstractFileSystem
+from ..utils import infer_storage_options, isfilelike
+
+
+class FTPFileSystem(AbstractFileSystem):
+    """A filesystem over classic FTP"""
+
+    root_marker = "/"
+    cachable = False
+    protocol = "ftp"
+
+    def __init__(
+        self,
+        host,
+        port=21,
+        username=None,
+        password=None,
+        acct=None,
+        block_size=None,
+        tempdir=None,
+        timeout=30,
+        encoding="utf-8",
+        tls=False,
+        **kwargs,
+    ):
+        """
+        You can use _get_kwargs_from_urls to get some kwargs from
+        a reasonable FTP url.
+
+        Authentication will be anonymous if username/password are not
+        given.
+
+        Parameters
+        ----------
+        host: str
+            The remote server name/ip to connect to
+        port: int
+            Port to connect with
+        username: str or None
+            If authenticating, the user's identifier
+        password: str of None
+            User's password on the server, if using
+        acct: str or None
+            Some servers also need an "account" string for auth
+        block_size: int or None
+            If given, the read-ahead or write buffer size.
+        tempdir: str
+            Directory on remote to put temporary files when in a transaction
+        timeout: int
+            Timeout of the ftp connection in seconds
+        encoding: str
+            Encoding to use for directories and filenames in FTP connection
+        tls: bool
+            Use FTP-TLS, by default False
+        """
+        super().__init__(**kwargs)
+        self.host = host
+        self.port = port
+        self.tempdir = tempdir or "/tmp"
+        self.cred = username or "", password or "", acct or ""
+        self.timeout = timeout
+        self.encoding = encoding
+        if block_size is not None:
+            self.blocksize = block_size
+        else:
+            self.blocksize = 2**16
+        self.tls = tls
+        self._connect()
+        if self.tls:
+            self.ftp.prot_p()
+
+    def _connect(self):
+        if self.tls:
+            ftp_cls = FTP_TLS
+        else:
+            ftp_cls = FTP
+        self.ftp = ftp_cls(timeout=self.timeout, encoding=self.encoding)
+        self.ftp.connect(self.host, self.port)
+        self.ftp.login(*self.cred)
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        return "/" + infer_storage_options(path)["path"].lstrip("/").rstrip("/")
+
+    @staticmethod
+    def _get_kwargs_from_urls(urlpath):
+        out = infer_storage_options(urlpath)
+        out.pop("path", None)
+        out.pop("protocol", None)
+        return out
+
+    def ls(self, path, detail=True, **kwargs):
+        path = self._strip_protocol(path)
+        out = []
+        if path not in self.dircache:
+            try:
+                try:
+                    out = [
+                        (fn, details)
+                        for (fn, details) in self.ftp.mlsd(path)
+                        if fn not in [".", ".."]
+                        and details["type"] not in ["pdir", "cdir"]
+                    ]
+                except error_perm:
+                    out = _mlsd2(self.ftp, path)  # Not platform independent
+                for fn, details in out:
+                    details["name"] = "/".join(
+                        ["" if path == "/" else path, fn.lstrip("/")]
+                    )
+                    if details["type"] == "file":
+                        details["size"] = int(details["size"])
+                    else:
+                        details["size"] = 0
+                    if details["type"] == "dir":
+                        details["type"] = "directory"
+                self.dircache[path] = out
+            except Error:
+                try:
+                    info = self.info(path)
+                    if info["type"] == "file":
+                        out = [(path, info)]
+                except (Error, IndexError) as exc:
+                    raise FileNotFoundError(path) from exc
+        files = self.dircache.get(path, out)
+        if not detail:
+            return sorted([fn for fn, details in files])
+        return [details for fn, details in files]
+
+    def info(self, path, **kwargs):
+        # implement with direct method
+        path = self._strip_protocol(path)
+        if path == "/":
+            # special case, since this dir has no real entry
+            return {"name": "/", "size": 0, "type": "directory"}
+        files = self.ls(self._parent(path).lstrip("/"), True)
+        try:
+            out = next(f for f in files if f["name"] == path)
+        except StopIteration as exc:
+            raise FileNotFoundError(path) from exc
+        return out
+
+    def get_file(self, rpath, lpath, **kwargs):
+        if self.isdir(rpath):
+            if not os.path.exists(lpath):
+                os.mkdir(lpath)
+            return
+        if isfilelike(lpath):
+            outfile = lpath
+        else:
+            outfile = open(lpath, "wb")
+
+        def cb(x):
+            outfile.write(x)
+
+        self.ftp.retrbinary(
+            f"RETR {rpath}",
+            blocksize=self.blocksize,
+            callback=cb,
+        )
+        if not isfilelike(lpath):
+            outfile.close()
+
+    def cat_file(self, path, start=None, end=None, **kwargs):
+        if end is not None:
+            return super().cat_file(path, start, end, **kwargs)
+        out = []
+
+        def cb(x):
+            out.append(x)
+
+        try:
+            self.ftp.retrbinary(
+                f"RETR {path}",
+                blocksize=self.blocksize,
+                rest=start,
+                callback=cb,
+            )
+        except (Error, error_perm) as orig_exc:
+            raise FileNotFoundError(path) from orig_exc
+        return b"".join(out)
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        cache_options=None,
+        autocommit=True,
+        **kwargs,
+    ):
+        path = self._strip_protocol(path)
+        block_size = block_size or self.blocksize
+        return FTPFile(
+            self,
+            path,
+            mode=mode,
+            block_size=block_size,
+            tempdir=self.tempdir,
+            autocommit=autocommit,
+            cache_options=cache_options,
+        )
+
+    def _rm(self, path):
+        path = self._strip_protocol(path)
+        self.ftp.delete(path)
+        self.invalidate_cache(self._parent(path))
+
+    def rm(self, path, recursive=False, maxdepth=None):
+        paths = self.expand_path(path, recursive=recursive, maxdepth=maxdepth)
+        for p in reversed(paths):
+            if self.isfile(p):
+                self.rm_file(p)
+            else:
+                self.rmdir(p)
+
+    def mkdir(self, path: str, create_parents: bool = True, **kwargs: Any) -> None:
+        path = self._strip_protocol(path)
+        parent = self._parent(path)
+        if parent != self.root_marker and not self.exists(parent) and create_parents:
+            self.mkdir(parent, create_parents=create_parents)
+
+        self.ftp.mkd(path)
+        self.invalidate_cache(self._parent(path))
+
+    def makedirs(self, path: str, exist_ok: bool = False) -> None:
+        path = self._strip_protocol(path)
+        if self.exists(path):
+            # NB: "/" does not "exist" as it has no directory entry
+            if not exist_ok:
+                raise FileExistsError(f"{path} exists without `exist_ok`")
+            # exists_ok=True -> no-op
+        else:
+            self.mkdir(path, create_parents=True)
+
+    def rmdir(self, path):
+        path = self._strip_protocol(path)
+        self.ftp.rmd(path)
+        self.invalidate_cache(self._parent(path))
+
+    def mv(self, path1, path2, **kwargs):
+        path1 = self._strip_protocol(path1)
+        path2 = self._strip_protocol(path2)
+        self.ftp.rename(path1, path2)
+        self.invalidate_cache(self._parent(path1))
+        self.invalidate_cache(self._parent(path2))
+
+    def __del__(self):
+        self.ftp.close()
+
+    def invalidate_cache(self, path=None):
+        if path is None:
+            self.dircache.clear()
+        else:
+            self.dircache.pop(path, None)
+        super().invalidate_cache(path)
+
+
+class TransferDone(Exception):
+    """Internal exception to break out of transfer"""
+
+    pass
+
+
+class FTPFile(AbstractBufferedFile):
+    """Interact with a remote FTP file with read/write buffering"""
+
+    def __init__(
+        self,
+        fs,
+        path,
+        mode="rb",
+        block_size="default",
+        autocommit=True,
+        cache_type="readahead",
+        cache_options=None,
+        **kwargs,
+    ):
+        super().__init__(
+            fs,
+            path,
+            mode=mode,
+            block_size=block_size,
+            autocommit=autocommit,
+            cache_type=cache_type,
+            cache_options=cache_options,
+            **kwargs,
+        )
+        if not autocommit:
+            self.target = self.path
+            self.path = "/".join([kwargs["tempdir"], str(uuid.uuid4())])
+
+    def commit(self):
+        self.fs.mv(self.path, self.target)
+
+    def discard(self):
+        self.fs.rm(self.path)
+
+    def _fetch_range(self, start, end):
+        """Get bytes between given byte limits
+
+        Implemented by raising an exception in the fetch callback when the
+        number of bytes received reaches the requested amount.
+
+        Will fail if the server does not respect the REST command on
+        retrieve requests.
+        """
+        out = []
+        total = [0]
+
+        def callback(x):
+            total[0] += len(x)
+            if total[0] > end - start:
+                out.append(x[: (end - start) - total[0]])
+                if end < self.size:
+                    raise TransferDone
+            else:
+                out.append(x)
+
+            if total[0] == end - start and end < self.size:
+                raise TransferDone
+
+        try:
+            self.fs.ftp.retrbinary(
+                f"RETR {self.path}",
+                blocksize=self.blocksize,
+                rest=start,
+                callback=callback,
+            )
+        except TransferDone:
+            try:
+                # stop transfer, we got enough bytes for this block
+                self.fs.ftp.abort()
+                self.fs.ftp.getmultiline()
+            except Error:
+                self.fs._connect()
+
+        return b"".join(out)
+
+    def _upload_chunk(self, final=False):
+        self.buffer.seek(0)
+        self.fs.ftp.storbinary(
+            f"STOR {self.path}", self.buffer, blocksize=self.blocksize, rest=self.offset
+        )
+        return True
+
+
+def _mlsd2(ftp, path="."):
+    """
+    Fall back to using `dir` instead of `mlsd` if not supported.
+
+    This parses a Linux style `ls -l` response to `dir`, but the response may
+    be platform dependent.
+
+    Parameters
+    ----------
+    ftp: ftplib.FTP
+    path: str
+        Expects to be given path, but defaults to ".".
+    """
+    lines = []
+    minfo = []
+    ftp.dir(path, lines.append)
+    for line in lines:
+        split_line = line.split()
+        if len(split_line) < 9:
+            continue
+        this = (
+            split_line[-1],
+            {
+                "modify": " ".join(split_line[5:8]),
+                "unix.owner": split_line[2],
+                "unix.group": split_line[3],
+                "unix.mode": split_line[0],
+                "size": split_line[4],
+            },
+        )
+        if this[1]["unix.mode"][0] == "d":
+            this[1]["type"] = "dir"
+        else:
+            this[1]["type"] = "file"
+        minfo.append(this)
+    return minfo

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/gist.py

@@ -0,0 +1,241 @@
+import requests
+
+from ..spec import AbstractFileSystem
+from ..utils import infer_storage_options
+from .memory import MemoryFile
+
+
+class GistFileSystem(AbstractFileSystem):
+    """
+    Interface to files in a single GitHub Gist.
+
+    Provides read-only access to a gist's files. Gists do not contain
+    subdirectories, so file listing is straightforward.
+
+    Parameters
+    ----------
+    gist_id: str
+        The ID of the gist you want to access (the long hex value from the URL).
+    filenames: list[str] (optional)
+        If provided, only make a file system representing these files, and do not fetch
+        the list of all files for this gist.
+    sha: str (optional)
+        If provided, fetch a particular revision of the gist. If omitted,
+        the latest revision is used.
+    username: str (optional)
+        GitHub username for authentication.
+    token: str (optional)
+        GitHub personal access token (required if username is given), or.
+    timeout: (float, float) or float, optional
+        Connect and read timeouts for requests (default 60s each).
+    kwargs: dict
+        Stored on `self.request_kw` and passed to `requests.get` when fetching Gist
+        metadata or reading ("opening") a file.
+    """
+
+    protocol = "gist"
+    gist_url = "https://api.github.com/gists/{gist_id}"
+    gist_rev_url = "https://api.github.com/gists/{gist_id}/{sha}"
+
+    def __init__(
+        self,
+        gist_id,
+        filenames=None,
+        sha=None,
+        username=None,
+        token=None,
+        timeout=None,
+        **kwargs,
+    ):
+        super().__init__()
+        self.gist_id = gist_id
+        self.filenames = filenames
+        self.sha = sha  # revision of the gist (optional)
+        if username is not None and token is None:
+            raise ValueError("User auth requires a token")
+        self.username = username
+        self.token = token
+        self.request_kw = kwargs
+        # Default timeouts to 60s connect/read if none provided
+        self.timeout = timeout if timeout is not None else (60, 60)
+
+        # We use a single-level "directory" cache, because a gist is essentially flat
+        self.dircache[""] = self._fetch_file_list()
+
+    @property
+    def kw(self):
+        """Auth parameters passed to 'requests' if we have username/token."""
+        kw = {
+            "headers": {
+                "Accept": "application/vnd.github+json",
+                "X-GitHub-Api-Version": "2022-11-28",
+            }
+        }
+        kw.update(self.request_kw)
+        if self.username and self.token:
+            kw["auth"] = (self.username, self.token)
+        elif self.token:
+            kw["headers"]["Authorization"] = f"Bearer {self.token}"
+        return kw
+
+    def _fetch_gist_metadata(self):
+        """
+        Fetch the JSON metadata for this gist (possibly for a specific revision).
+        """
+        if self.sha:
+            url = self.gist_rev_url.format(gist_id=self.gist_id, sha=self.sha)
+        else:
+            url = self.gist_url.format(gist_id=self.gist_id)
+
+        r = requests.get(url, timeout=self.timeout, **self.kw)
+        if r.status_code == 404:
+            raise FileNotFoundError(
+                f"Gist not found: {self.gist_id}@{self.sha or 'latest'}"
+            )
+        r.raise_for_status()
+        return r.json()
+
+    def _fetch_file_list(self):
+        """
+        Returns a list of dicts describing each file in the gist. These get stored
+        in self.dircache[""].
+        """
+        meta = self._fetch_gist_metadata()
+        if self.filenames:
+            available_files = meta.get("files", {})
+            files = {}
+            for fn in self.filenames:
+                if fn not in available_files:
+                    raise FileNotFoundError(fn)
+                files[fn] = available_files[fn]
+        else:
+            files = meta.get("files", {})
+
+        out = []
+        for fname, finfo in files.items():
+            if finfo is None:
+                # Occasionally GitHub returns a file entry with null if it was deleted
+                continue
+            # Build a directory entry
+            out.append(
+                {
+                    "name": fname,  # file's name
+                    "type": "file",  # gists have no subdirectories
+                    "size": finfo.get("size", 0),  # file size in bytes
+                    "raw_url": finfo.get("raw_url"),
+                }
+            )
+        return out
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        """
+        Remove 'gist://' from the path, if present.
+        """
+        # The default infer_storage_options can handle gist://username:token@id/file
+        # or gist://id/file, but let's ensure we handle a normal usage too.
+        # We'll just strip the protocol prefix if it exists.
+        path = infer_storage_options(path).get("path", path)
+        return path.lstrip("/")
+
+    @staticmethod
+    def _get_kwargs_from_urls(path):
+        """
+        Parse 'gist://' style URLs into GistFileSystem constructor kwargs.
+        For example:
+          gist://:TOKEN@<gist_id>/file.txt
+          gist://username:TOKEN@<gist_id>/file.txt
+        """
+        so = infer_storage_options(path)
+        out = {}
+        if "username" in so and so["username"]:
+            out["username"] = so["username"]
+        if "password" in so and so["password"]:
+            out["token"] = so["password"]
+        if "host" in so and so["host"]:
+            # We interpret 'host' as the gist ID
+            out["gist_id"] = so["host"]
+
+        # Extract SHA and filename from path
+        if "path" in so and so["path"]:
+            path_parts = so["path"].rsplit("/", 2)[-2:]
+            if len(path_parts) == 2:
+                if path_parts[0]:  # SHA present
+                    out["sha"] = path_parts[0]
+                if path_parts[1]:  # filename also present
+                    out["filenames"] = [path_parts[1]]
+
+        return out
+
+    def ls(self, path="", detail=False, **kwargs):
+        """
+        List files in the gist. Gists are single-level, so any 'path' is basically
+        the filename, or empty for all files.
+
+        Parameters
+        ----------
+        path : str, optional
+            The filename to list. If empty, returns all files in the gist.
+        detail : bool, default False
+            If True, return a list of dicts; if False, return a list of filenames.
+        """
+        path = self._strip_protocol(path or "")
+        # If path is empty, return all
+        if path == "":
+            results = self.dircache[""]
+        else:
+            # We want just the single file with this name
+            all_files = self.dircache[""]
+            results = [f for f in all_files if f["name"] == path]
+            if not results:
+                raise FileNotFoundError(path)
+        if detail:
+            return results
+        else:
+            return sorted(f["name"] for f in results)
+
+    def _open(self, path, mode="rb", block_size=None, **kwargs):
+        """
+        Read a single file from the gist.
+        """
+        if mode != "rb":
+            raise NotImplementedError("GitHub Gist FS is read-only (no write).")
+
+        path = self._strip_protocol(path)
+        # Find the file entry in our dircache
+        matches = [f for f in self.dircache[""] if f["name"] == path]
+        if not matches:
+            raise FileNotFoundError(path)
+        finfo = matches[0]
+
+        raw_url = finfo.get("raw_url")
+        if not raw_url:
+            raise FileNotFoundError(f"No raw_url for file: {path}")
+
+        r = requests.get(raw_url, timeout=self.timeout, **self.kw)
+        if r.status_code == 404:
+            raise FileNotFoundError(path)
+        r.raise_for_status()
+        return MemoryFile(path, None, r.content)
+
+    def cat(self, path, recursive=False, on_error="raise", **kwargs):
+        """
+        Return {path: contents} for the given file or files. If 'recursive' is True,
+        and path is empty, returns all files in the gist.
+        """
+        paths = self.expand_path(path, recursive=recursive)
+        out = {}
+        for p in paths:
+            try:
+                with self.open(p, "rb") as f:
+                    out[p] = f.read()
+            except FileNotFoundError as e:
+                if on_error == "raise":
+                    raise e
+                elif on_error == "omit":
+                    pass  # skip
+                else:
+                    out[p] = e
+        if len(paths) == 1 and paths[0] == path:
+            return out[path]
+        return out

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/git.py

@@ -0,0 +1,114 @@
+import os
+
+import pygit2
+
+from fsspec.spec import AbstractFileSystem
+
+from .memory import MemoryFile
+
+
+class GitFileSystem(AbstractFileSystem):
+    """Browse the files of a local git repo at any hash/tag/branch
+
+    (experimental backend)
+    """
+
+    root_marker = ""
+    cachable = True
+
+    def __init__(self, path=None, fo=None, ref=None, **kwargs):
+        """
+
+        Parameters
+        ----------
+        path: str (optional)
+            Local location of the repo (uses current directory if not given).
+            May be deprecated in favour of ``fo``. When used with a higher
+            level function such as fsspec.open(), may be of the form
+            "git://[path-to-repo[:]][ref@]path/to/file" (but the actual
+            file path should not contain "@" or ":").
+        fo: str (optional)
+            Same as ``path``, but passed as part of a chained URL. This one
+            takes precedence if both are given.
+        ref: str (optional)
+            Reference to work with, could be a hash, tag or branch name. Defaults
+            to current working tree. Note that ``ls`` and ``open`` also take hash,
+            so this becomes the default for those operations
+        kwargs
+        """
+        super().__init__(**kwargs)
+        self.repo = pygit2.Repository(fo or path or os.getcwd())
+        self.ref = ref or "master"
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        path = super()._strip_protocol(path).lstrip("/")
+        if ":" in path:
+            path = path.split(":", 1)[1]
+        if "@" in path:
+            path = path.split("@", 1)[1]
+        return path.lstrip("/")
+
+    def _path_to_object(self, path, ref):
+        comm, ref = self.repo.resolve_refish(ref or self.ref)
+        parts = path.split("/")
+        tree = comm.tree
+        for part in parts:
+            if part and isinstance(tree, pygit2.Tree):
+                if part not in tree:
+                    raise FileNotFoundError(path)
+                tree = tree[part]
+        return tree
+
+    @staticmethod
+    def _get_kwargs_from_urls(path):
+        path = path.removeprefix("git://")
+        out = {}
+        if ":" in path:
+            out["path"], path = path.split(":", 1)
+        if "@" in path:
+            out["ref"], path = path.split("@", 1)
+        return out
+
+    @staticmethod
+    def _object_to_info(obj, path=None):
+        # obj.name and obj.filemode are None for the root tree!
+        is_dir = isinstance(obj, pygit2.Tree)
+        return {
+            "type": "directory" if is_dir else "file",
+            "name": (
+                "/".join([path, obj.name or ""]).lstrip("/") if path else obj.name
+            ),
+            "hex": str(obj.id),
+            "mode": "100644" if obj.filemode is None else f"{obj.filemode:o}",
+            "size": 0 if is_dir else obj.size,
+        }
+
+    def ls(self, path, detail=True, ref=None, **kwargs):
+        tree = self._path_to_object(self._strip_protocol(path), ref)
+        return [
+            GitFileSystem._object_to_info(obj, path)
+            if detail
+            else GitFileSystem._object_to_info(obj, path)["name"]
+            for obj in (tree if isinstance(tree, pygit2.Tree) else [tree])
+        ]
+
+    def info(self, path, ref=None, **kwargs):
+        tree = self._path_to_object(self._strip_protocol(path), ref)
+        return GitFileSystem._object_to_info(tree, path)
+
+    def ukey(self, path, ref=None):
+        return self.info(path, ref=ref)["hex"]
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=True,
+        cache_options=None,
+        ref=None,
+        **kwargs,
+    ):
+        obj = self._path_to_object(path, ref or self.ref)
+        return MemoryFile(data=obj.data)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/github.py

@@ -0,0 +1,333 @@
+import base64
+import re
+
+import requests
+
+from ..spec import AbstractFileSystem
+from ..utils import infer_storage_options
+from .memory import MemoryFile
+
+
+class GithubFileSystem(AbstractFileSystem):
+    """Interface to files in github
+
+    An instance of this class provides the files residing within a remote github
+    repository. You may specify a point in the repos history, by SHA, branch
+    or tag (default is current master).
+
+    For files less than 1 MB in size, file content is returned directly in a
+    MemoryFile. For larger files, or for files tracked by git-lfs, file content
+    is returned as an HTTPFile wrapping the ``download_url`` provided by the
+    GitHub API.
+
+    When using fsspec.open, allows URIs of the form:
+
+    - "github://path/file", in which case you must specify org, repo and
+      may specify sha in the extra args
+    - 'github://org:repo@/precip/catalog.yml', where the org and repo are
+      part of the URI
+    - 'github://org:repo@sha/precip/catalog.yml', where the sha is also included
+
+    ``sha`` can be the full or abbreviated hex of the commit you want to fetch
+    from, or a branch or tag name (so long as it doesn't contain special characters
+    like "/", "?", which would have to be HTTP-encoded).
+
+    For authorised access, you must provide username and token, which can be made
+    at https://github.com/settings/tokens
+    """
+
+    url = "https://api.github.com/repos/{org}/{repo}/git/trees/{sha}"
+    content_url = "https://api.github.com/repos/{org}/{repo}/contents/{path}?ref={sha}"
+    protocol = "github"
+    timeout = (60, 60)  # connect, read timeouts
+
+    def __init__(
+        self, org, repo, sha=None, username=None, token=None, timeout=None, **kwargs
+    ):
+        super().__init__(**kwargs)
+        self.org = org
+        self.repo = repo
+        if (username is None) ^ (token is None):
+            raise ValueError("Auth required both username and token")
+        self.username = username
+        self.token = token
+        if timeout is not None:
+            self.timeout = timeout
+        if sha is None:
+            # look up default branch (not necessarily "master")
+            u = "https://api.github.com/repos/{org}/{repo}"
+            r = requests.get(
+                u.format(org=org, repo=repo), timeout=self.timeout, **self.kw
+            )
+            r.raise_for_status()
+            sha = r.json()["default_branch"]
+
+        self.root = sha
+        self.ls("")
+        try:
+            from .http import HTTPFileSystem
+
+            self.http_fs = HTTPFileSystem(**kwargs)
+        except ImportError:
+            self.http_fs = None
+
+    @property
+    def kw(self):
+        if self.username:
+            return {"auth": (self.username, self.token)}
+        return {}
+
+    @classmethod
+    def repos(cls, org_or_user, is_org=True):
+        """List repo names for given org or user
+
+        This may become the top level of the FS
+
+        Parameters
+        ----------
+        org_or_user: str
+            Name of the github org or user to query
+        is_org: bool (default True)
+            Whether the name is an organisation (True) or user (False)
+
+        Returns
+        -------
+        List of string
+        """
+        r = requests.get(
+            f"https://api.github.com/{['users', 'orgs'][is_org]}/{org_or_user}/repos",
+            timeout=cls.timeout,
+        )
+        r.raise_for_status()
+        return [repo["name"] for repo in r.json()]
+
+    @property
+    def tags(self):
+        """Names of tags in the repo"""
+        r = requests.get(
+            f"https://api.github.com/repos/{self.org}/{self.repo}/tags",
+            timeout=self.timeout,
+            **self.kw,
+        )
+        r.raise_for_status()
+        return [t["name"] for t in r.json()]
+
+    @property
+    def branches(self):
+        """Names of branches in the repo"""
+        r = requests.get(
+            f"https://api.github.com/repos/{self.org}/{self.repo}/branches",
+            timeout=self.timeout,
+            **self.kw,
+        )
+        r.raise_for_status()
+        return [t["name"] for t in r.json()]
+
+    @property
+    def refs(self):
+        """Named references, tags and branches"""
+        return {"tags": self.tags, "branches": self.branches}
+
+    def ls(self, path, detail=False, sha=None, _sha=None, **kwargs):
+        """List files at given path
+
+        Parameters
+        ----------
+        path: str
+            Location to list, relative to repo root
+        detail: bool
+            If True, returns list of dicts, one per file; if False, returns
+            list of full filenames only
+        sha: str (optional)
+            List at the given point in the repo history, branch or tag name or commit
+            SHA
+        _sha: str (optional)
+            List this specific tree object (used internally to descend into trees)
+        """
+        path = self._strip_protocol(path)
+        if path == "":
+            _sha = sha or self.root
+        if _sha is None:
+            parts = path.rstrip("/").split("/")
+            so_far = ""
+            _sha = sha or self.root
+            for part in parts:
+                out = self.ls(so_far, True, sha=sha, _sha=_sha)
+                so_far += "/" + part if so_far else part
+                out = [o for o in out if o["name"] == so_far]
+                if not out:
+                    raise FileNotFoundError(path)
+                out = out[0]
+                if out["type"] == "file":
+                    if detail:
+                        return [out]
+                    else:
+                        return path
+                _sha = out["sha"]
+        if path not in self.dircache or sha not in [self.root, None]:
+            r = requests.get(
+                self.url.format(org=self.org, repo=self.repo, sha=_sha),
+                timeout=self.timeout,
+                **self.kw,
+            )
+            if r.status_code == 404:
+                raise FileNotFoundError(path)
+            r.raise_for_status()
+            types = {"blob": "file", "tree": "directory"}
+            out = [
+                {
+                    "name": path + "/" + f["path"] if path else f["path"],
+                    "mode": f["mode"],
+                    "type": types[f["type"]],
+                    "size": f.get("size", 0),
+                    "sha": f["sha"],
+                }
+                for f in r.json()["tree"]
+                if f["type"] in types
+            ]
+            if sha in [self.root, None]:
+                self.dircache[path] = out
+        else:
+            out = self.dircache[path]
+        if detail:
+            return out
+        else:
+            return sorted([f["name"] for f in out])
+
+    def invalidate_cache(self, path=None):
+        self.dircache.clear()
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        opts = infer_storage_options(path)
+        if "username" not in opts:
+            return super()._strip_protocol(path)
+        return opts["path"].lstrip("/")
+
+    @staticmethod
+    def _get_kwargs_from_urls(path):
+        opts = infer_storage_options(path)
+        if "username" not in opts:
+            return {}
+        out = {"org": opts["username"], "repo": opts["password"]}
+        if opts["host"]:
+            out["sha"] = opts["host"]
+        return out
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        cache_options=None,
+        sha=None,
+        **kwargs,
+    ):
+        if mode != "rb":
+            raise NotImplementedError
+
+        # construct a url to hit the GitHub API's repo contents API
+        url = self.content_url.format(
+            org=self.org, repo=self.repo, path=path, sha=sha or self.root
+        )
+
+        # make a request to this API, and parse the response as JSON
+        r = requests.get(url, timeout=self.timeout, **self.kw)
+        if r.status_code == 404:
+            raise FileNotFoundError(path)
+        r.raise_for_status()
+        content_json = r.json()
+
+        # if the response's content key is not empty, try to parse it as base64
+        if content_json["content"]:
+            content = base64.b64decode(content_json["content"])
+
+            # as long as the content does not start with the string
+            # "version https://git-lfs.github.com/"
+            # then it is probably not a git-lfs pointer and we can just return
+            # the content directly
+            if not content.startswith(b"version https://git-lfs.github.com/"):
+                return MemoryFile(None, None, content)
+
+        # we land here if the content was not present in the first response
+        # (regular file over 1MB or git-lfs tracked file)
+        # in this case, we get let the HTTPFileSystem handle the download
+        if self.http_fs is None:
+            raise ImportError(
+                "Please install fsspec[http] to access github files >1 MB "
+                "or git-lfs tracked files."
+            )
+        return self.http_fs.open(
+            content_json["download_url"],
+            mode=mode,
+            block_size=block_size,
+            cache_options=cache_options,
+            **kwargs,
+        )
+
+    def rm(self, path, recursive=False, maxdepth=None, message=None):
+        path = self.expand_path(path, recursive=recursive, maxdepth=maxdepth)
+        for p in reversed(path):
+            self.rm_file(p, message=message)
+
+    def rm_file(self, path, message=None, **kwargs):
+        """
+        Remove a file from a specified branch using a given commit message.
+
+        Since Github DELETE operation requires a branch name, and we can't reliably
+        determine whether the provided SHA refers to a branch, tag, or commit, we
+        assume it's a branch. If it's not, the user will encounter an error when
+        attempting to retrieve the file SHA or delete the file.
+
+        Parameters
+        ----------
+        path: str
+            The file's location relative to the repository root.
+        message: str, optional
+            The commit message for the deletion.
+        """
+
+        if not self.username:
+            raise ValueError("Authentication required")
+
+        path = self._strip_protocol(path)
+
+        # Attempt to get SHA from cache or Github API
+        sha = self._get_sha_from_cache(path)
+        if not sha:
+            url = self.content_url.format(
+                org=self.org, repo=self.repo, path=path.lstrip("/"), sha=self.root
+            )
+            r = requests.get(url, timeout=self.timeout, **self.kw)
+            if r.status_code == 404:
+                raise FileNotFoundError(path)
+            r.raise_for_status()
+            sha = r.json()["sha"]
+
+        # Delete the file
+        delete_url = self.content_url.format(
+            org=self.org, repo=self.repo, path=path, sha=self.root
+        )
+        branch = self.root
+        data = {
+            "message": message or f"Delete {path}",
+            "sha": sha,
+            **({"branch": branch} if branch else {}),
+        }
+
+        r = requests.delete(delete_url, json=data, timeout=self.timeout, **self.kw)
+        error_message = r.json().get("message", "")
+        if re.search(r"Branch .+ not found", error_message):
+            error = "Remove only works when the filesystem is initialised from a branch or default (None)"
+            raise ValueError(error)
+        r.raise_for_status()
+
+        self.invalidate_cache(path)
+
+    def _get_sha_from_cache(self, path):
+        for entries in self.dircache.values():
+            for entry in entries:
+                entry_path = entry.get("name")
+                if entry_path and entry_path == path and "sha" in entry:
+                    return entry["sha"]
+        return None

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/http.py

@@ -0,0 +1,891 @@
+import asyncio
+import io
+import logging
+import re
+import weakref
+from copy import copy
+from urllib.parse import urlparse
+
+import aiohttp
+import yarl
+
+from fsspec.asyn import AbstractAsyncStreamedFile, AsyncFileSystem, sync, sync_wrapper
+from fsspec.callbacks import DEFAULT_CALLBACK
+from fsspec.exceptions import FSTimeoutError
+from fsspec.spec import AbstractBufferedFile
+from fsspec.utils import (
+    DEFAULT_BLOCK_SIZE,
+    glob_translate,
+    isfilelike,
+    nullcontext,
+    tokenize,
+)
+
+from ..caching import AllBytes
+
+# https://stackoverflow.com/a/15926317/3821154
+ex = re.compile(r"""<(a|A)\s+(?:[^>]*?\s+)?(href|HREF)=["'](?P<url>[^"']+)""")
+ex2 = re.compile(r"""(?P<url>http[s]?://[-a-zA-Z0-9@:%_+.~#?&/=]+)""")
+logger = logging.getLogger("fsspec.http")
+
+
+async def get_client(**kwargs):
+    return aiohttp.ClientSession(**kwargs)
+
+
+class HTTPFileSystem(AsyncFileSystem):
+    """
+    Simple File-System for fetching data via HTTP(S)
+
+    ``ls()`` is implemented by loading the parent page and doing a regex
+    match on the result. If simple_link=True, anything of the form
+    "http(s)://server.com/stuff?thing=other"; otherwise only links within
+    HTML href tags will be used.
+    """
+
+    protocol = ("http", "https")
+    sep = "/"
+
+    def __init__(
+        self,
+        simple_links=True,
+        block_size=None,
+        same_scheme=True,
+        size_policy=None,
+        cache_type="bytes",
+        cache_options=None,
+        asynchronous=False,
+        loop=None,
+        client_kwargs=None,
+        get_client=get_client,
+        encoded=False,
+        **storage_options,
+    ):
+        """
+        NB: if this is called async, you must await set_client
+
+        Parameters
+        ----------
+        block_size: int
+            Blocks to read bytes; if 0, will default to raw requests file-like
+            objects instead of HTTPFile instances
+        simple_links: bool
+            If True, will consider both HTML <a> tags and anything that looks
+            like a URL; if False, will consider only the former.
+        same_scheme: True
+            When doing ls/glob, if this is True, only consider paths that have
+            http/https matching the input URLs.
+        size_policy: this argument is deprecated
+        client_kwargs: dict
+            Passed to aiohttp.ClientSession, see
+            https://docs.aiohttp.org/en/stable/client_reference.html
+            For example, ``{'auth': aiohttp.BasicAuth('user', 'pass')}``
+        get_client: Callable[..., aiohttp.ClientSession]
+            A callable, which takes keyword arguments and constructs
+            an aiohttp.ClientSession. Its state will be managed by
+            the HTTPFileSystem class.
+        storage_options: key-value
+            Any other parameters passed on to requests
+        cache_type, cache_options: defaults used in open()
+        """
+        super().__init__(self, asynchronous=asynchronous, loop=loop, **storage_options)
+        self.block_size = block_size if block_size is not None else DEFAULT_BLOCK_SIZE
+        self.simple_links = simple_links
+        self.same_schema = same_scheme
+        self.cache_type = cache_type
+        self.cache_options = cache_options
+        self.client_kwargs = client_kwargs or {}
+        self.get_client = get_client
+        self.encoded = encoded
+        self.kwargs = storage_options
+        self._session = None
+
+        # Clean caching-related parameters from `storage_options`
+        # before propagating them as `request_options` through `self.kwargs`.
+        # TODO: Maybe rename `self.kwargs` to `self.request_options` to make
+        #       it clearer.
+        request_options = copy(storage_options)
+        self.use_listings_cache = request_options.pop("use_listings_cache", False)
+        request_options.pop("listings_expiry_time", None)
+        request_options.pop("max_paths", None)
+        request_options.pop("skip_instance_cache", None)
+        self.kwargs = request_options
+
+    @property
+    def fsid(self):
+        return "http"
+
+    def encode_url(self, url):
+        return yarl.URL(url, encoded=self.encoded)
+
+    @staticmethod
+    def close_session(loop, session):
+        if loop is not None and loop.is_running():
+            try:
+                sync(loop, session.close, timeout=0.1)
+                return
+            except (TimeoutError, FSTimeoutError, NotImplementedError):
+                pass
+        connector = getattr(session, "_connector", None)
+        if connector is not None:
+            # close after loop is dead
+            connector._close()
+
+    async def set_session(self):
+        if self._session is None:
+            self._session = await self.get_client(loop=self.loop, **self.client_kwargs)
+            if not self.asynchronous:
+                weakref.finalize(self, self.close_session, self.loop, self._session)
+        return self._session
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        """For HTTP, we always want to keep the full URL"""
+        return path
+
+    @classmethod
+    def _parent(cls, path):
+        # override, since _strip_protocol is different for URLs
+        par = super()._parent(path)
+        if len(par) > 7:  # "http://..."
+            return par
+        return ""
+
+    async def _ls_real(self, url, detail=True, **kwargs):
+        # ignoring URL-encoded arguments
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        logger.debug(url)
+        session = await self.set_session()
+        async with session.get(self.encode_url(url), **self.kwargs) as r:
+            self._raise_not_found_for_status(r, url)
+
+            if "Content-Type" in r.headers:
+                mimetype = r.headers["Content-Type"].partition(";")[0]
+            else:
+                mimetype = None
+
+            if mimetype in ("text/html", None):
+                try:
+                    text = await r.text(errors="ignore")
+                    if self.simple_links:
+                        links = ex2.findall(text) + [u[2] for u in ex.findall(text)]
+                    else:
+                        links = [u[2] for u in ex.findall(text)]
+                except UnicodeDecodeError:
+                    links = []  # binary, not HTML
+            else:
+                links = []
+
+        out = set()
+        parts = urlparse(url)
+        for l in links:
+            if isinstance(l, tuple):
+                l = l[1]
+            if l.startswith("/") and len(l) > 1:
+                # absolute URL on this server
+                l = f"{parts.scheme}://{parts.netloc}{l}"
+            if l.startswith("http"):
+                if self.same_schema and l.startswith(url.rstrip("/") + "/"):
+                    out.add(l)
+                elif l.replace("https", "http").startswith(
+                    url.replace("https", "http").rstrip("/") + "/"
+                ):
+                    # allowed to cross http <-> https
+                    out.add(l)
+            else:
+                if l not in ["..", "../"]:
+                    # Ignore FTP-like "parent"
+                    out.add("/".join([url.rstrip("/"), l.lstrip("/")]))
+        if not out and url.endswith("/"):
+            out = await self._ls_real(url.rstrip("/"), detail=False)
+        if detail:
+            return [
+                {
+                    "name": u,
+                    "size": None,
+                    "type": "directory" if u.endswith("/") else "file",
+                }
+                for u in out
+            ]
+        else:
+            return sorted(out)
+
+    async def _ls(self, url, detail=True, **kwargs):
+        if self.use_listings_cache and url in self.dircache:
+            out = self.dircache[url]
+        else:
+            out = await self._ls_real(url, detail=detail, **kwargs)
+            self.dircache[url] = out
+        return out
+
+    ls = sync_wrapper(_ls)
+
+    def _raise_not_found_for_status(self, response, url):
+        """
+        Raises FileNotFoundError for 404s, otherwise uses raise_for_status.
+        """
+        if response.status == 404:
+            raise FileNotFoundError(url)
+        response.raise_for_status()
+
+    async def _cat_file(self, url, start=None, end=None, **kwargs):
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        logger.debug(url)
+
+        if start is not None or end is not None:
+            if start == end:
+                return b""
+            headers = kw.pop("headers", {}).copy()
+
+            headers["Range"] = await self._process_limits(url, start, end)
+            kw["headers"] = headers
+        session = await self.set_session()
+        async with session.get(self.encode_url(url), **kw) as r:
+            out = await r.read()
+            self._raise_not_found_for_status(r, url)
+        return out
+
+    async def _get_file(
+        self, rpath, lpath, chunk_size=5 * 2**20, callback=DEFAULT_CALLBACK, **kwargs
+    ):
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        logger.debug(rpath)
+        session = await self.set_session()
+        async with session.get(self.encode_url(rpath), **kw) as r:
+            try:
+                size = int(r.headers["content-length"])
+            except (ValueError, KeyError):
+                size = None
+
+            callback.set_size(size)
+            self._raise_not_found_for_status(r, rpath)
+            if isfilelike(lpath):
+                outfile = lpath
+            else:
+                outfile = open(lpath, "wb")  # noqa: ASYNC230
+
+            try:
+                chunk = True
+                while chunk:
+                    chunk = await r.content.read(chunk_size)
+                    outfile.write(chunk)
+                    callback.relative_update(len(chunk))
+            finally:
+                if not isfilelike(lpath):
+                    outfile.close()
+
+    async def _put_file(
+        self,
+        lpath,
+        rpath,
+        chunk_size=5 * 2**20,
+        callback=DEFAULT_CALLBACK,
+        method="post",
+        mode="overwrite",
+        **kwargs,
+    ):
+        if mode != "overwrite":
+            raise NotImplementedError("Exclusive write")
+
+        async def gen_chunks():
+            # Support passing arbitrary file-like objects
+            # and use them instead of streams.
+            if isinstance(lpath, io.IOBase):
+                context = nullcontext(lpath)
+                use_seek = False  # might not support seeking
+            else:
+                context = open(lpath, "rb")  # noqa: ASYNC230
+                use_seek = True
+
+            with context as f:
+                if use_seek:
+                    callback.set_size(f.seek(0, 2))
+                    f.seek(0)
+                else:
+                    callback.set_size(getattr(f, "size", None))
+
+                chunk = f.read(chunk_size)
+                while chunk:
+                    yield chunk
+                    callback.relative_update(len(chunk))
+                    chunk = f.read(chunk_size)
+
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        session = await self.set_session()
+
+        method = method.lower()
+        if method not in ("post", "put"):
+            raise ValueError(
+                f"method has to be either 'post' or 'put', not: {method!r}"
+            )
+
+        meth = getattr(session, method)
+        async with meth(self.encode_url(rpath), data=gen_chunks(), **kw) as resp:
+            self._raise_not_found_for_status(resp, rpath)
+
+    async def _exists(self, path, **kwargs):
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        try:
+            logger.debug(path)
+            session = await self.set_session()
+            r = await session.get(self.encode_url(path), **kw)
+            async with r:
+                return r.status < 400
+        except aiohttp.ClientError:
+            return False
+
+    async def _isfile(self, path, **kwargs):
+        return await self._exists(path, **kwargs)
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=None,  # XXX: This differs from the base class.
+        cache_type=None,
+        cache_options=None,
+        size=None,
+        **kwargs,
+    ):
+        """Make a file-like object
+
+        Parameters
+        ----------
+        path: str
+            Full URL with protocol
+        mode: string
+            must be "rb"
+        block_size: int or None
+            Bytes to download in one request; use instance value if None. If
+            zero, will return a streaming Requests file-like instance.
+        kwargs: key-value
+            Any other parameters, passed to requests calls
+        """
+        if mode != "rb":
+            raise NotImplementedError
+        block_size = block_size if block_size is not None else self.block_size
+        kw = self.kwargs.copy()
+        kw["asynchronous"] = self.asynchronous
+        kw.update(kwargs)
+        info = {}
+        size = size or info.update(self.info(path, **kwargs)) or info["size"]
+        session = sync(self.loop, self.set_session)
+        if block_size and size and info.get("partial", True):
+            return HTTPFile(
+                self,
+                path,
+                session=session,
+                block_size=block_size,
+                mode=mode,
+                size=size,
+                cache_type=cache_type or self.cache_type,
+                cache_options=cache_options or self.cache_options,
+                loop=self.loop,
+                **kw,
+            )
+        else:
+            return HTTPStreamFile(
+                self,
+                path,
+                mode=mode,
+                loop=self.loop,
+                session=session,
+                **kw,
+            )
+
+    async def open_async(self, path, mode="rb", size=None, **kwargs):
+        session = await self.set_session()
+        if size is None:
+            try:
+                size = (await self._info(path, **kwargs))["size"]
+            except FileNotFoundError:
+                pass
+        return AsyncStreamFile(
+            self,
+            path,
+            loop=self.loop,
+            session=session,
+            size=size,
+            **kwargs,
+        )
+
+    def ukey(self, url):
+        """Unique identifier; assume HTTP files are static, unchanging"""
+        return tokenize(url, self.kwargs, self.protocol)
+
+    async def _info(self, url, **kwargs):
+        """Get info of URL
+
+        Tries to access location via HEAD, and then GET methods, but does
+        not fetch the data.
+
+        It is possible that the server does not supply any size information, in
+        which case size will be given as None (and certain operations on the
+        corresponding file will not work).
+        """
+        info = {}
+        session = await self.set_session()
+
+        for policy in ["head", "get"]:
+            try:
+                info.update(
+                    await _file_info(
+                        self.encode_url(url),
+                        size_policy=policy,
+                        session=session,
+                        **self.kwargs,
+                        **kwargs,
+                    )
+                )
+                if info.get("size") is not None:
+                    break
+            except Exception as exc:
+                if policy == "get":
+                    # If get failed, then raise a FileNotFoundError
+                    raise FileNotFoundError(url) from exc
+                logger.debug("", exc_info=exc)
+
+        return {"name": url, "size": None, **info, "type": "file"}
+
+    async def _glob(self, path, maxdepth=None, **kwargs):
+        """
+        Find files by glob-matching.
+
+        This implementation is idntical to the one in AbstractFileSystem,
+        but "?" is not considered as a character for globbing, because it is
+        so common in URLs, often identifying the "query" part.
+        """
+        if maxdepth is not None and maxdepth < 1:
+            raise ValueError("maxdepth must be at least 1")
+        import re
+
+        ends_with_slash = path.endswith("/")  # _strip_protocol strips trailing slash
+        path = self._strip_protocol(path)
+        append_slash_to_dirname = ends_with_slash or path.endswith(("/**", "/*"))
+        idx_star = path.find("*") if path.find("*") >= 0 else len(path)
+        idx_brace = path.find("[") if path.find("[") >= 0 else len(path)
+
+        min_idx = min(idx_star, idx_brace)
+
+        detail = kwargs.pop("detail", False)
+
+        if not has_magic(path):
+            if await self._exists(path, **kwargs):
+                if not detail:
+                    return [path]
+                else:
+                    return {path: await self._info(path, **kwargs)}
+            else:
+                if not detail:
+                    return []  # glob of non-existent returns empty
+                else:
+                    return {}
+        elif "/" in path[:min_idx]:
+            min_idx = path[:min_idx].rindex("/")
+            root = path[: min_idx + 1]
+            depth = path[min_idx + 1 :].count("/") + 1
+        else:
+            root = ""
+            depth = path[min_idx + 1 :].count("/") + 1
+
+        if "**" in path:
+            if maxdepth is not None:
+                idx_double_stars = path.find("**")
+                depth_double_stars = path[idx_double_stars:].count("/") + 1
+                depth = depth - depth_double_stars + maxdepth
+            else:
+                depth = None
+
+        allpaths = await self._find(
+            root, maxdepth=depth, withdirs=True, detail=True, **kwargs
+        )
+
+        pattern = glob_translate(path + ("/" if ends_with_slash else ""))
+        pattern = re.compile(pattern)
+
+        out = {
+            (
+                p.rstrip("/")
+                if not append_slash_to_dirname
+                and info["type"] == "directory"
+                and p.endswith("/")
+                else p
+            ): info
+            for p, info in sorted(allpaths.items())
+            if pattern.match(p.rstrip("/"))
+        }
+
+        if detail:
+            return out
+        else:
+            return list(out)
+
+    async def _isdir(self, path):
+        # override, since all URLs are (also) files
+        try:
+            return bool(await self._ls(path))
+        except (FileNotFoundError, ValueError):
+            return False
+
+    async def _pipe_file(self, path, value, mode="overwrite", **kwargs):
+        """
+        Write bytes to a remote file over HTTP.
+
+        Parameters
+        ----------
+        path : str
+            Target URL where the data should be written
+        value : bytes
+            Data to be written
+        mode : str
+            How to write to the file - 'overwrite' or 'append'
+        **kwargs : dict
+            Additional parameters to pass to the HTTP request
+        """
+        url = self._strip_protocol(path)
+        headers = kwargs.pop("headers", {})
+        headers["Content-Length"] = str(len(value))
+
+        session = await self.set_session()
+
+        async with session.put(url, data=value, headers=headers, **kwargs) as r:
+            r.raise_for_status()
+
+
+class HTTPFile(AbstractBufferedFile):
+    """
+    A file-like object pointing to a remote HTTP(S) resource
+
+    Supports only reading, with read-ahead of a predetermined block-size.
+
+    In the case that the server does not supply the filesize, only reading of
+    the complete file in one go is supported.
+
+    Parameters
+    ----------
+    url: str
+        Full URL of the remote resource, including the protocol
+    session: aiohttp.ClientSession or None
+        All calls will be made within this session, to avoid restarting
+        connections where the server allows this
+    block_size: int or None
+        The amount of read-ahead to do, in bytes. Default is 5MB, or the value
+        configured for the FileSystem creating this file
+    size: None or int
+        If given, this is the size of the file in bytes, and we don't attempt
+        to call the server to find the value.
+    kwargs: all other key-values are passed to requests calls.
+    """
+
+    def __init__(
+        self,
+        fs,
+        url,
+        session=None,
+        block_size=None,
+        mode="rb",
+        cache_type="bytes",
+        cache_options=None,
+        size=None,
+        loop=None,
+        asynchronous=False,
+        **kwargs,
+    ):
+        if mode != "rb":
+            raise NotImplementedError("File mode not supported")
+        self.asynchronous = asynchronous
+        self.loop = loop
+        self.url = url
+        self.session = session
+        self.details = {"name": url, "size": size, "type": "file"}
+        super().__init__(
+            fs=fs,
+            path=url,
+            mode=mode,
+            block_size=block_size,
+            cache_type=cache_type,
+            cache_options=cache_options,
+            **kwargs,
+        )
+
+    def read(self, length=-1):
+        """Read bytes from file
+
+        Parameters
+        ----------
+        length: int
+            Read up to this many bytes. If negative, read all content to end of
+            file. If the server has not supplied the filesize, attempting to
+            read only part of the data will raise a ValueError.
+        """
+        if (
+            (length < 0 and self.loc == 0)  # explicit read all
+            # but not when the size is known and fits into a block anyways
+            and not (self.size is not None and self.size <= self.blocksize)
+        ):
+            self._fetch_all()
+        if self.size is None:
+            if length < 0:
+                self._fetch_all()
+        else:
+            length = min(self.size - self.loc, length)
+        return super().read(length)
+
+    async def async_fetch_all(self):
+        """Read whole file in one shot, without caching
+
+        This is only called when position is still at zero,
+        and read() is called without a byte-count.
+        """
+        logger.debug(f"Fetch all for {self}")
+        if not isinstance(self.cache, AllBytes):
+            r = await self.session.get(self.fs.encode_url(self.url), **self.kwargs)
+            async with r:
+                r.raise_for_status()
+                out = await r.read()
+                self.cache = AllBytes(
+                    size=len(out), fetcher=None, blocksize=None, data=out
+                )
+                self.size = len(out)
+
+    _fetch_all = sync_wrapper(async_fetch_all)
+
+    def _parse_content_range(self, headers):
+        """Parse the Content-Range header"""
+        s = headers.get("Content-Range", "")
+        m = re.match(r"bytes (\d+-\d+|\*)/(\d+|\*)", s)
+        if not m:
+            return None, None, None
+
+        if m[1] == "*":
+            start = end = None
+        else:
+            start, end = [int(x) for x in m[1].split("-")]
+        total = None if m[2] == "*" else int(m[2])
+        return start, end, total
+
+    async def async_fetch_range(self, start, end):
+        """Download a block of data
+
+        The expectation is that the server returns only the requested bytes,
+        with HTTP code 206. If this is not the case, we first check the headers,
+        and then stream the output - if the data size is bigger than we
+        requested, an exception is raised.
+        """
+        logger.debug(f"Fetch range for {self}: {start}-{end}")
+        kwargs = self.kwargs.copy()
+        headers = kwargs.pop("headers", {}).copy()
+        headers["Range"] = f"bytes={start}-{end - 1}"
+        logger.debug(f"{self.url} : {headers['Range']}")
+        r = await self.session.get(
+            self.fs.encode_url(self.url), headers=headers, **kwargs
+        )
+        async with r:
+            if r.status == 416:
+                # range request outside file
+                return b""
+            r.raise_for_status()
+
+            # If the server has handled the range request, it should reply
+            # with status 206 (partial content). But we'll guess that a suitable
+            # Content-Range header or a Content-Length no more than the
+            # requested range also mean we have got the desired range.
+            response_is_range = (
+                r.status == 206
+                or self._parse_content_range(r.headers)[0] == start
+                or int(r.headers.get("Content-Length", end + 1)) <= end - start
+            )
+
+            if response_is_range:
+                # partial content, as expected
+                out = await r.read()
+            elif start > 0:
+                raise ValueError(
+                    "The HTTP server doesn't appear to support range requests. "
+                    "Only reading this file from the beginning is supported. "
+                    "Open with block_size=0 for a streaming file interface."
+                )
+            else:
+                # Response is not a range, but we want the start of the file,
+                # so we can read the required amount anyway.
+                cl = 0
+                out = []
+                while True:
+                    chunk = await r.content.read(2**20)
+                    # data size unknown, let's read until we have enough
+                    if chunk:
+                        out.append(chunk)
+                        cl += len(chunk)
+                        if cl > end - start:
+                            break
+                    else:
+                        break
+                out = b"".join(out)[: end - start]
+            return out
+
+    _fetch_range = sync_wrapper(async_fetch_range)
+
+
+magic_check = re.compile("([*[])")
+
+
+def has_magic(s):
+    match = magic_check.search(s)
+    return match is not None
+
+
+class HTTPStreamFile(AbstractBufferedFile):
+    def __init__(self, fs, url, mode="rb", loop=None, session=None, **kwargs):
+        self.asynchronous = kwargs.pop("asynchronous", False)
+        self.url = url
+        self.loop = loop
+        self.session = session
+        if mode != "rb":
+            raise ValueError
+        self.details = {"name": url, "size": None}
+        super().__init__(fs=fs, path=url, mode=mode, cache_type="none", **kwargs)
+
+        async def cor():
+            r = await self.session.get(self.fs.encode_url(url), **kwargs).__aenter__()
+            self.fs._raise_not_found_for_status(r, url)
+            return r
+
+        self.r = sync(self.loop, cor)
+        self.loop = fs.loop
+
+    def seek(self, loc, whence=0):
+        if loc == 0 and whence == 1:
+            return
+        if loc == self.loc and whence == 0:
+            return
+        raise ValueError("Cannot seek streaming HTTP file")
+
+    async def _read(self, num=-1):
+        out = await self.r.content.read(num)
+        self.loc += len(out)
+        return out
+
+    read = sync_wrapper(_read)
+
+    async def _close(self):
+        self.r.close()
+
+    def close(self):
+        asyncio.run_coroutine_threadsafe(self._close(), self.loop)
+        super().close()
+
+
+class AsyncStreamFile(AbstractAsyncStreamedFile):
+    def __init__(
+        self, fs, url, mode="rb", loop=None, session=None, size=None, **kwargs
+    ):
+        self.url = url
+        self.session = session
+        self.r = None
+        if mode != "rb":
+            raise ValueError
+        self.details = {"name": url, "size": None}
+        self.kwargs = kwargs
+        super().__init__(fs=fs, path=url, mode=mode, cache_type="none")
+        self.size = size
+
+    async def read(self, num=-1):
+        if self.r is None:
+            r = await self.session.get(
+                self.fs.encode_url(self.url), **self.kwargs
+            ).__aenter__()
+            self.fs._raise_not_found_for_status(r, self.url)
+            self.r = r
+        out = await self.r.content.read(num)
+        self.loc += len(out)
+        return out
+
+    async def close(self):
+        if self.r is not None:
+            self.r.close()
+            self.r = None
+        await super().close()
+
+
+async def get_range(session, url, start, end, file=None, **kwargs):
+    # explicit get a range when we know it must be safe
+    kwargs = kwargs.copy()
+    headers = kwargs.pop("headers", {}).copy()
+    headers["Range"] = f"bytes={start}-{end - 1}"
+    r = await session.get(url, headers=headers, **kwargs)
+    r.raise_for_status()
+    async with r:
+        out = await r.read()
+    if file:
+        with open(file, "r+b") as f:  # noqa: ASYNC230
+            f.seek(start)
+            f.write(out)
+    else:
+        return out
+
+
+async def _file_info(url, session, size_policy="head", **kwargs):
+    """Call HEAD on the server to get details about the file (size/checksum etc.)
+
+    Default operation is to explicitly allow redirects and use encoding
+    'identity' (no compression) to get the true size of the target.
+    """
+    logger.debug("Retrieve file size for %s", url)
+    kwargs = kwargs.copy()
+    ar = kwargs.pop("allow_redirects", True)
+    head = kwargs.get("headers", {}).copy()
+    head["Accept-Encoding"] = "identity"
+    kwargs["headers"] = head
+
+    info = {}
+    if size_policy == "head":
+        r = await session.head(url, allow_redirects=ar, **kwargs)
+    elif size_policy == "get":
+        r = await session.get(url, allow_redirects=ar, **kwargs)
+    else:
+        raise TypeError(f'size_policy must be "head" or "get", got {size_policy}')
+    async with r:
+        r.raise_for_status()
+
+        if "Content-Length" in r.headers:
+            # Some servers may choose to ignore Accept-Encoding and return
+            # compressed content, in which case the returned size is unreliable.
+            if "Content-Encoding" not in r.headers or r.headers["Content-Encoding"] in [
+                "identity",
+                "",
+            ]:
+                info["size"] = int(r.headers["Content-Length"])
+        elif "Content-Range" in r.headers:
+            info["size"] = int(r.headers["Content-Range"].split("/")[1])
+
+        if "Content-Type" in r.headers:
+            info["mimetype"] = r.headers["Content-Type"].partition(";")[0]
+
+        if r.headers.get("Accept-Ranges") == "none":
+            # Some servers may explicitly discourage partial content requests, but
+            # the lack of "Accept-Ranges" does not always indicate they would fail
+            info["partial"] = False
+
+        info["url"] = str(r.url)
+
+        for checksum_field in ["ETag", "Content-MD5", "Digest", "Last-Modified"]:
+            if r.headers.get(checksum_field):
+                info[checksum_field] = r.headers[checksum_field]
+
+    return info
+
+
+async def _file_size(url, session=None, *args, **kwargs):
+    if session is None:
+        session = await get_client()
+    info = await _file_info(url, session=session, *args, **kwargs)
+    return info.get("size")
+
+
+file_size = sync_wrapper(_file_size)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/http_sync.py

@@ -0,0 +1,931 @@
+"""This file is largely copied from http.py"""
+
+import io
+import logging
+import re
+import urllib.error
+import urllib.parse
+from copy import copy
+from json import dumps, loads
+from urllib.parse import urlparse
+
+try:
+    import yarl
+except (ImportError, ModuleNotFoundError, OSError):
+    yarl = False
+
+from fsspec.callbacks import _DEFAULT_CALLBACK
+from fsspec.registry import register_implementation
+from fsspec.spec import AbstractBufferedFile, AbstractFileSystem
+from fsspec.utils import DEFAULT_BLOCK_SIZE, isfilelike, nullcontext, tokenize
+
+from ..caching import AllBytes
+
+# https://stackoverflow.com/a/15926317/3821154
+ex = re.compile(r"""<(a|A)\s+(?:[^>]*?\s+)?(href|HREF)=["'](?P<url>[^"']+)""")
+ex2 = re.compile(r"""(?P<url>http[s]?://[-a-zA-Z0-9@:%_+.~#?&/=]+)""")
+logger = logging.getLogger("fsspec.http")
+
+
+class JsHttpException(urllib.error.HTTPError): ...
+
+
+class StreamIO(io.BytesIO):
+    # fake class, so you can set attributes on it
+    # will eventually actually stream
+    ...
+
+
+class ResponseProxy:
+    """Looks like a requests response"""
+
+    def __init__(self, req, stream=False):
+        self.request = req
+        self.stream = stream
+        self._data = None
+        self._headers = None
+
+    @property
+    def raw(self):
+        if self._data is None:
+            b = self.request.response.to_bytes()
+            if self.stream:
+                self._data = StreamIO(b)
+            else:
+                self._data = b
+        return self._data
+
+    def close(self):
+        if hasattr(self, "_data"):
+            del self._data
+
+    @property
+    def headers(self):
+        if self._headers is None:
+            self._headers = dict(
+                [
+                    _.split(": ")
+                    for _ in self.request.getAllResponseHeaders().strip().split("\r\n")
+                ]
+            )
+        return self._headers
+
+    @property
+    def status_code(self):
+        return int(self.request.status)
+
+    def raise_for_status(self):
+        if not self.ok:
+            raise JsHttpException(
+                self.url, self.status_code, self.reason, self.headers, None
+            )
+
+    def iter_content(self, chunksize, *_, **__):
+        while True:
+            out = self.raw.read(chunksize)
+            if out:
+                yield out
+            else:
+                break
+
+    @property
+    def reason(self):
+        return self.request.statusText
+
+    @property
+    def ok(self):
+        return self.status_code < 400
+
+    @property
+    def url(self):
+        return self.request.response.responseURL
+
+    @property
+    def text(self):
+        # TODO: encoding from headers
+        return self.content.decode()
+
+    @property
+    def content(self):
+        self.stream = False
+        return self.raw
+
+    def json(self):
+        return loads(self.text)
+
+
+class RequestsSessionShim:
+    def __init__(self):
+        self.headers = {}
+
+    def request(
+        self,
+        method,
+        url,
+        params=None,
+        data=None,
+        headers=None,
+        cookies=None,
+        files=None,
+        auth=None,
+        timeout=None,
+        allow_redirects=None,
+        proxies=None,
+        hooks=None,
+        stream=None,
+        verify=None,
+        cert=None,
+        json=None,
+    ):
+        from js import Blob, XMLHttpRequest
+
+        logger.debug("JS request: %s %s", method, url)
+
+        if cert or verify or proxies or files or cookies or hooks:
+            raise NotImplementedError
+        if data and json:
+            raise ValueError("Use json= or data=, not both")
+        req = XMLHttpRequest.new()
+        extra = auth if auth else ()
+        if params:
+            url = f"{url}?{urllib.parse.urlencode(params)}"
+        req.open(method, url, False, *extra)
+        if timeout:
+            req.timeout = timeout
+        if headers:
+            for k, v in headers.items():
+                req.setRequestHeader(k, v)
+
+        req.setRequestHeader("Accept", "application/octet-stream")
+        req.responseType = "arraybuffer"
+        if json:
+            blob = Blob.new([dumps(data)], {type: "application/json"})
+            req.send(blob)
+        elif data:
+            if isinstance(data, io.IOBase):
+                data = data.read()
+            blob = Blob.new([data], {type: "application/octet-stream"})
+            req.send(blob)
+        else:
+            req.send(None)
+        return ResponseProxy(req, stream=stream)
+
+    def get(self, url, **kwargs):
+        return self.request("GET", url, **kwargs)
+
+    def head(self, url, **kwargs):
+        return self.request("HEAD", url, **kwargs)
+
+    def post(self, url, **kwargs):
+        return self.request("POST}", url, **kwargs)
+
+    def put(self, url, **kwargs):
+        return self.request("PUT", url, **kwargs)
+
+    def patch(self, url, **kwargs):
+        return self.request("PATCH", url, **kwargs)
+
+    def delete(self, url, **kwargs):
+        return self.request("DELETE", url, **kwargs)
+
+
+class HTTPFileSystem(AbstractFileSystem):
+    """
+    Simple File-System for fetching data via HTTP(S)
+
+    This is the BLOCKING version of the normal HTTPFileSystem. It uses
+    requests in normal python and the JS runtime in pyodide.
+
+    ***This implementation is extremely experimental, do not use unless
+    you are testing pyodide/pyscript integration***
+    """
+
+    protocol = ("http", "https", "sync-http", "sync-https")
+    sep = "/"
+
+    def __init__(
+        self,
+        simple_links=True,
+        block_size=None,
+        same_scheme=True,
+        cache_type="readahead",
+        cache_options=None,
+        client_kwargs=None,
+        encoded=False,
+        **storage_options,
+    ):
+        """
+
+        Parameters
+        ----------
+        block_size: int
+            Blocks to read bytes; if 0, will default to raw requests file-like
+            objects instead of HTTPFile instances
+        simple_links: bool
+            If True, will consider both HTML <a> tags and anything that looks
+            like a URL; if False, will consider only the former.
+        same_scheme: True
+            When doing ls/glob, if this is True, only consider paths that have
+            http/https matching the input URLs.
+        size_policy: this argument is deprecated
+        client_kwargs: dict
+            Passed to aiohttp.ClientSession, see
+            https://docs.aiohttp.org/en/stable/client_reference.html
+            For example, ``{'auth': aiohttp.BasicAuth('user', 'pass')}``
+        storage_options: key-value
+            Any other parameters passed on to requests
+        cache_type, cache_options: defaults used in open
+        """
+        super().__init__(self, **storage_options)
+        self.block_size = block_size if block_size is not None else DEFAULT_BLOCK_SIZE
+        self.simple_links = simple_links
+        self.same_schema = same_scheme
+        self.cache_type = cache_type
+        self.cache_options = cache_options
+        self.client_kwargs = client_kwargs or {}
+        self.encoded = encoded
+        self.kwargs = storage_options
+
+        try:
+            import js  # noqa: F401
+
+            logger.debug("Starting JS session")
+            self.session = RequestsSessionShim()
+            self.js = True
+        except Exception as e:
+            import requests
+
+            logger.debug("Starting cpython session because of: %s", e)
+            self.session = requests.Session(**(client_kwargs or {}))
+            self.js = False
+
+        request_options = copy(storage_options)
+        self.use_listings_cache = request_options.pop("use_listings_cache", False)
+        request_options.pop("listings_expiry_time", None)
+        request_options.pop("max_paths", None)
+        request_options.pop("skip_instance_cache", None)
+        self.kwargs = request_options
+
+    @property
+    def fsid(self):
+        return "sync-http"
+
+    def encode_url(self, url):
+        if yarl:
+            return yarl.URL(url, encoded=self.encoded)
+        return url
+
+    @classmethod
+    def _strip_protocol(cls, path: str) -> str:
+        """For HTTP, we always want to keep the full URL"""
+        path = path.replace("sync-http://", "http://").replace(
+            "sync-https://", "https://"
+        )
+        return path
+
+    @classmethod
+    def _parent(cls, path):
+        # override, since _strip_protocol is different for URLs
+        par = super()._parent(path)
+        if len(par) > 7:  # "http://..."
+            return par
+        return ""
+
+    def _ls_real(self, url, detail=True, **kwargs):
+        # ignoring URL-encoded arguments
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        logger.debug(url)
+        r = self.session.get(self.encode_url(url), **self.kwargs)
+        self._raise_not_found_for_status(r, url)
+        text = r.text
+        if self.simple_links:
+            links = ex2.findall(text) + [u[2] for u in ex.findall(text)]
+        else:
+            links = [u[2] for u in ex.findall(text)]
+        out = set()
+        parts = urlparse(url)
+        for l in links:
+            if isinstance(l, tuple):
+                l = l[1]
+            if l.startswith("/") and len(l) > 1:
+                # absolute URL on this server
+                l = parts.scheme + "://" + parts.netloc + l
+            if l.startswith("http"):
+                if self.same_schema and l.startswith(url.rstrip("/") + "/"):
+                    out.add(l)
+                elif l.replace("https", "http").startswith(
+                    url.replace("https", "http").rstrip("/") + "/"
+                ):
+                    # allowed to cross http <-> https
+                    out.add(l)
+            else:
+                if l not in ["..", "../"]:
+                    # Ignore FTP-like "parent"
+                    out.add("/".join([url.rstrip("/"), l.lstrip("/")]))
+        if not out and url.endswith("/"):
+            out = self._ls_real(url.rstrip("/"), detail=False)
+        if detail:
+            return [
+                {
+                    "name": u,
+                    "size": None,
+                    "type": "directory" if u.endswith("/") else "file",
+                }
+                for u in out
+            ]
+        else:
+            return sorted(out)
+
+    def ls(self, url, detail=True, **kwargs):
+        if self.use_listings_cache and url in self.dircache:
+            out = self.dircache[url]
+        else:
+            out = self._ls_real(url, detail=detail, **kwargs)
+            self.dircache[url] = out
+        return out
+
+    def _raise_not_found_for_status(self, response, url):
+        """
+        Raises FileNotFoundError for 404s, otherwise uses raise_for_status.
+        """
+        if response.status_code == 404:
+            raise FileNotFoundError(url)
+        response.raise_for_status()
+
+    def cat_file(self, url, start=None, end=None, **kwargs):
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        logger.debug(url)
+
+        if start is not None or end is not None:
+            if start == end:
+                return b""
+            headers = kw.pop("headers", {}).copy()
+
+            headers["Range"] = self._process_limits(url, start, end)
+            kw["headers"] = headers
+        r = self.session.get(self.encode_url(url), **kw)
+        self._raise_not_found_for_status(r, url)
+        return r.content
+
+    def get_file(
+        self, rpath, lpath, chunk_size=5 * 2**20, callback=_DEFAULT_CALLBACK, **kwargs
+    ):
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        logger.debug(rpath)
+        r = self.session.get(self.encode_url(rpath), **kw)
+        try:
+            size = int(
+                r.headers.get("content-length", None)
+                or r.headers.get("Content-Length", None)
+            )
+        except (ValueError, KeyError, TypeError):
+            size = None
+
+        callback.set_size(size)
+        self._raise_not_found_for_status(r, rpath)
+        if not isfilelike(lpath):
+            lpath = open(lpath, "wb")
+        for chunk in r.iter_content(chunk_size, decode_unicode=False):
+            lpath.write(chunk)
+            callback.relative_update(len(chunk))
+
+    def put_file(
+        self,
+        lpath,
+        rpath,
+        chunk_size=5 * 2**20,
+        callback=_DEFAULT_CALLBACK,
+        method="post",
+        **kwargs,
+    ):
+        def gen_chunks():
+            # Support passing arbitrary file-like objects
+            # and use them instead of streams.
+            if isinstance(lpath, io.IOBase):
+                context = nullcontext(lpath)
+                use_seek = False  # might not support seeking
+            else:
+                context = open(lpath, "rb")
+                use_seek = True
+
+            with context as f:
+                if use_seek:
+                    callback.set_size(f.seek(0, 2))
+                    f.seek(0)
+                else:
+                    callback.set_size(getattr(f, "size", None))
+
+                chunk = f.read(chunk_size)
+                while chunk:
+                    yield chunk
+                    callback.relative_update(len(chunk))
+                    chunk = f.read(chunk_size)
+
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+
+        method = method.lower()
+        if method not in ("post", "put"):
+            raise ValueError(
+                f"method has to be either 'post' or 'put', not: {method!r}"
+            )
+
+        meth = getattr(self.session, method)
+        resp = meth(rpath, data=gen_chunks(), **kw)
+        self._raise_not_found_for_status(resp, rpath)
+
+    def _process_limits(self, url, start, end):
+        """Helper for "Range"-based _cat_file"""
+        size = None
+        suff = False
+        if start is not None and start < 0:
+            # if start is negative and end None, end is the "suffix length"
+            if end is None:
+                end = -start
+                start = ""
+                suff = True
+            else:
+                size = size or self.info(url)["size"]
+                start = size + start
+        elif start is None:
+            start = 0
+        if not suff:
+            if end is not None and end < 0:
+                if start is not None:
+                    size = size or self.info(url)["size"]
+                    end = size + end
+            elif end is None:
+                end = ""
+            if isinstance(end, int):
+                end -= 1  # bytes range is inclusive
+        return f"bytes={start}-{end}"
+
+    def exists(self, path, **kwargs):
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        try:
+            logger.debug(path)
+            r = self.session.get(self.encode_url(path), **kw)
+            return r.status_code < 400
+        except Exception:
+            return False
+
+    def isfile(self, path, **kwargs):
+        return self.exists(path, **kwargs)
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=None,  # XXX: This differs from the base class.
+        cache_type=None,
+        cache_options=None,
+        size=None,
+        **kwargs,
+    ):
+        """Make a file-like object
+
+        Parameters
+        ----------
+        path: str
+            Full URL with protocol
+        mode: string
+            must be "rb"
+        block_size: int or None
+            Bytes to download in one request; use instance value if None. If
+            zero, will return a streaming Requests file-like instance.
+        kwargs: key-value
+            Any other parameters, passed to requests calls
+        """
+        if mode != "rb":
+            raise NotImplementedError
+        block_size = block_size if block_size is not None else self.block_size
+        kw = self.kwargs.copy()
+        kw.update(kwargs)
+        size = size or self.info(path, **kwargs)["size"]
+        if block_size and size:
+            return HTTPFile(
+                self,
+                path,
+                session=self.session,
+                block_size=block_size,
+                mode=mode,
+                size=size,
+                cache_type=cache_type or self.cache_type,
+                cache_options=cache_options or self.cache_options,
+                **kw,
+            )
+        else:
+            return HTTPStreamFile(
+                self,
+                path,
+                mode=mode,
+                session=self.session,
+                **kw,
+            )
+
+    def ukey(self, url):
+        """Unique identifier; assume HTTP files are static, unchanging"""
+        return tokenize(url, self.kwargs, self.protocol)
+
+    def info(self, url, **kwargs):
+        """Get info of URL
+
+        Tries to access location via HEAD, and then GET methods, but does
+        not fetch the data.
+
+        It is possible that the server does not supply any size information, in
+        which case size will be given as None (and certain operations on the
+        corresponding file will not work).
+        """
+        info = {}
+        for policy in ["head", "get"]:
+            try:
+                info.update(
+                    _file_info(
+                        self.encode_url(url),
+                        size_policy=policy,
+                        session=self.session,
+                        **self.kwargs,
+                        **kwargs,
+                    )
+                )
+                if info.get("size") is not None:
+                    break
+            except Exception as exc:
+                if policy == "get":
+                    # If get failed, then raise a FileNotFoundError
+                    raise FileNotFoundError(url) from exc
+                logger.debug(str(exc))
+
+        return {"name": url, "size": None, **info, "type": "file"}
+
+    def glob(self, path, maxdepth=None, **kwargs):
+        """
+        Find files by glob-matching.
+
+        This implementation is idntical to the one in AbstractFileSystem,
+        but "?" is not considered as a character for globbing, because it is
+        so common in URLs, often identifying the "query" part.
+        """
+        import re
+
+        ends = path.endswith("/")
+        path = self._strip_protocol(path)
+        indstar = path.find("*") if path.find("*") >= 0 else len(path)
+        indbrace = path.find("[") if path.find("[") >= 0 else len(path)
+
+        ind = min(indstar, indbrace)
+
+        detail = kwargs.pop("detail", False)
+
+        if not has_magic(path):
+            root = path
+            depth = 1
+            if ends:
+                path += "/*"
+            elif self.exists(path):
+                if not detail:
+                    return [path]
+                else:
+                    return {path: self.info(path)}
+            else:
+                if not detail:
+                    return []  # glob of non-existent returns empty
+                else:
+                    return {}
+        elif "/" in path[:ind]:
+            ind2 = path[:ind].rindex("/")
+            root = path[: ind2 + 1]
+            depth = None if "**" in path else path[ind2 + 1 :].count("/") + 1
+        else:
+            root = ""
+            depth = None if "**" in path else path[ind + 1 :].count("/") + 1
+
+        allpaths = self.find(
+            root, maxdepth=maxdepth or depth, withdirs=True, detail=True, **kwargs
+        )
+        # Escape characters special to python regex, leaving our supported
+        # special characters in place.
+        # See https://www.gnu.org/software/bash/manual/html_node/Pattern-Matching.html
+        # for shell globbing details.
+        pattern = (
+            "^"
+            + (
+                path.replace("\\", r"\\")
+                .replace(".", r"\.")
+                .replace("+", r"\+")
+                .replace("//", "/")
+                .replace("(", r"\(")
+                .replace(")", r"\)")
+                .replace("|", r"\|")
+                .replace("^", r"\^")
+                .replace("$", r"\$")
+                .replace("{", r"\{")
+                .replace("}", r"\}")
+                .rstrip("/")
+            )
+            + "$"
+        )
+        pattern = re.sub("[*]{2}", "=PLACEHOLDER=", pattern)
+        pattern = re.sub("[*]", "[^/]*", pattern)
+        pattern = re.compile(pattern.replace("=PLACEHOLDER=", ".*"))
+        out = {
+            p: allpaths[p]
+            for p in sorted(allpaths)
+            if pattern.match(p.replace("//", "/").rstrip("/"))
+        }
+        if detail:
+            return out
+        else:
+            return list(out)
+
+    def isdir(self, path):
+        # override, since all URLs are (also) files
+        try:
+            return bool(self.ls(path))
+        except (FileNotFoundError, ValueError):
+            return False
+
+
+class HTTPFile(AbstractBufferedFile):
+    """
+    A file-like object pointing to a remove HTTP(S) resource
+
+    Supports only reading, with read-ahead of a predermined block-size.
+
+    In the case that the server does not supply the filesize, only reading of
+    the complete file in one go is supported.
+
+    Parameters
+    ----------
+    url: str
+        Full URL of the remote resource, including the protocol
+    session: requests.Session or None
+        All calls will be made within this session, to avoid restarting
+        connections where the server allows this
+    block_size: int or None
+        The amount of read-ahead to do, in bytes. Default is 5MB, or the value
+        configured for the FileSystem creating this file
+    size: None or int
+        If given, this is the size of the file in bytes, and we don't attempt
+        to call the server to find the value.
+    kwargs: all other key-values are passed to requests calls.
+    """
+
+    def __init__(
+        self,
+        fs,
+        url,
+        session=None,
+        block_size=None,
+        mode="rb",
+        cache_type="bytes",
+        cache_options=None,
+        size=None,
+        **kwargs,
+    ):
+        if mode != "rb":
+            raise NotImplementedError("File mode not supported")
+        self.url = url
+        self.session = session
+        self.details = {"name": url, "size": size, "type": "file"}
+        super().__init__(
+            fs=fs,
+            path=url,
+            mode=mode,
+            block_size=block_size,
+            cache_type=cache_type,
+            cache_options=cache_options,
+            **kwargs,
+        )
+
+    def read(self, length=-1):
+        """Read bytes from file
+
+        Parameters
+        ----------
+        length: int
+            Read up to this many bytes. If negative, read all content to end of
+            file. If the server has not supplied the filesize, attempting to
+            read only part of the data will raise a ValueError.
+        """
+        if (
+            (length < 0 and self.loc == 0)  # explicit read all
+            # but not when the size is known and fits into a block anyways
+            and not (self.size is not None and self.size <= self.blocksize)
+        ):
+            self._fetch_all()
+        if self.size is None:
+            if length < 0:
+                self._fetch_all()
+        else:
+            length = min(self.size - self.loc, length)
+        return super().read(length)
+
+    def _fetch_all(self):
+        """Read whole file in one shot, without caching
+
+        This is only called when position is still at zero,
+        and read() is called without a byte-count.
+        """
+        logger.debug(f"Fetch all for {self}")
+        if not isinstance(self.cache, AllBytes):
+            r = self.session.get(self.fs.encode_url(self.url), **self.kwargs)
+            r.raise_for_status()
+            out = r.content
+            self.cache = AllBytes(size=len(out), fetcher=None, blocksize=None, data=out)
+            self.size = len(out)
+
+    def _parse_content_range(self, headers):
+        """Parse the Content-Range header"""
+        s = headers.get("Content-Range", "")
+        m = re.match(r"bytes (\d+-\d+|\*)/(\d+|\*)", s)
+        if not m:
+            return None, None, None
+
+        if m[1] == "*":
+            start = end = None
+        else:
+            start, end = [int(x) for x in m[1].split("-")]
+        total = None if m[2] == "*" else int(m[2])
+        return start, end, total
+
+    def _fetch_range(self, start, end):
+        """Download a block of data
+
+        The expectation is that the server returns only the requested bytes,
+        with HTTP code 206. If this is not the case, we first check the headers,
+        and then stream the output - if the data size is bigger than we
+        requested, an exception is raised.
+        """
+        logger.debug(f"Fetch range for {self}: {start}-{end}")
+        kwargs = self.kwargs.copy()
+        headers = kwargs.pop("headers", {}).copy()
+        headers["Range"] = f"bytes={start}-{end - 1}"
+        logger.debug("%s : %s", self.url, headers["Range"])
+        r = self.session.get(self.fs.encode_url(self.url), headers=headers, **kwargs)
+        if r.status_code == 416:
+            # range request outside file
+            return b""
+        r.raise_for_status()
+
+        # If the server has handled the range request, it should reply
+        # with status 206 (partial content). But we'll guess that a suitable
+        # Content-Range header or a Content-Length no more than the
+        # requested range also mean we have got the desired range.
+        cl = r.headers.get("Content-Length", r.headers.get("content-length", end + 1))
+        response_is_range = (
+            r.status_code == 206
+            or self._parse_content_range(r.headers)[0] == start
+            or int(cl) <= end - start
+        )
+
+        if response_is_range:
+            # partial content, as expected
+            out = r.content
+        elif start > 0:
+            raise ValueError(
+                "The HTTP server doesn't appear to support range requests. "
+                "Only reading this file from the beginning is supported. "
+                "Open with block_size=0 for a streaming file interface."
+            )
+        else:
+            # Response is not a range, but we want the start of the file,
+            # so we can read the required amount anyway.
+            cl = 0
+            out = []
+            for chunk in r.iter_content(2**20, False):
+                out.append(chunk)
+                cl += len(chunk)
+            out = b"".join(out)[: end - start]
+        return out
+
+
+magic_check = re.compile("([*[])")
+
+
+def has_magic(s):
+    match = magic_check.search(s)
+    return match is not None
+
+
+class HTTPStreamFile(AbstractBufferedFile):
+    def __init__(self, fs, url, mode="rb", session=None, **kwargs):
+        self.url = url
+        self.session = session
+        if mode != "rb":
+            raise ValueError
+        self.details = {"name": url, "size": None}
+        super().__init__(fs=fs, path=url, mode=mode, cache_type="readahead", **kwargs)
+
+        r = self.session.get(self.fs.encode_url(url), stream=True, **kwargs)
+        self.fs._raise_not_found_for_status(r, url)
+        self.it = r.iter_content(1024, False)
+        self.leftover = b""
+
+        self.r = r
+
+    def seek(self, *args, **kwargs):
+        raise ValueError("Cannot seek streaming HTTP file")
+
+    def read(self, num=-1):
+        bufs = [self.leftover]
+        leng = len(self.leftover)
+        while leng < num or num < 0:
+            try:
+                out = self.it.__next__()
+            except StopIteration:
+                break
+            if out:
+                bufs.append(out)
+            else:
+                break
+            leng += len(out)
+        out = b"".join(bufs)
+        if num >= 0:
+            self.leftover = out[num:]
+            out = out[:num]
+        else:
+            self.leftover = b""
+        self.loc += len(out)
+        return out
+
+    def close(self):
+        self.r.close()
+        self.closed = True
+
+
+def get_range(session, url, start, end, **kwargs):
+    # explicit get a range when we know it must be safe
+    kwargs = kwargs.copy()
+    headers = kwargs.pop("headers", {}).copy()
+    headers["Range"] = f"bytes={start}-{end - 1}"
+    r = session.get(url, headers=headers, **kwargs)
+    r.raise_for_status()
+    return r.content
+
+
+def _file_info(url, session, size_policy="head", **kwargs):
+    """Call HEAD on the server to get details about the file (size/checksum etc.)
+
+    Default operation is to explicitly allow redirects and use encoding
+    'identity' (no compression) to get the true size of the target.
+    """
+    logger.debug("Retrieve file size for %s", url)
+    kwargs = kwargs.copy()
+    ar = kwargs.pop("allow_redirects", True)
+    head = kwargs.get("headers", {}).copy()
+    # TODO: not allowed in JS
+    # head["Accept-Encoding"] = "identity"
+    kwargs["headers"] = head
+
+    info = {}
+    if size_policy == "head":
+        r = session.head(url, allow_redirects=ar, **kwargs)
+    elif size_policy == "get":
+        r = session.get(url, allow_redirects=ar, **kwargs)
+    else:
+        raise TypeError(f'size_policy must be "head" or "get", got {size_policy}')
+    r.raise_for_status()
+
+    # TODO:
+    #  recognise lack of 'Accept-Ranges',
+    #                 or 'Accept-Ranges': 'none' (not 'bytes')
+    #  to mean streaming only, no random access => return None
+    if "Content-Length" in r.headers:
+        info["size"] = int(r.headers["Content-Length"])
+    elif "Content-Range" in r.headers:
+        info["size"] = int(r.headers["Content-Range"].split("/")[1])
+    elif "content-length" in r.headers:
+        info["size"] = int(r.headers["content-length"])
+    elif "content-range" in r.headers:
+        info["size"] = int(r.headers["content-range"].split("/")[1])
+
+    for checksum_field in ["ETag", "Content-MD5", "Digest"]:
+        if r.headers.get(checksum_field):
+            info[checksum_field] = r.headers[checksum_field]
+
+    return info
+
+
+# importing this is enough to register it
+def register():
+    register_implementation("http", HTTPFileSystem, clobber=True)
+    register_implementation("https", HTTPFileSystem, clobber=True)
+    register_implementation("sync-http", HTTPFileSystem, clobber=True)
+    register_implementation("sync-https", HTTPFileSystem, clobber=True)
+
+
+register()
+
+
+def unregister():
+    from fsspec.implementations.http import HTTPFileSystem
+
+    register_implementation("http", HTTPFileSystem, clobber=True)
+    register_implementation("https", HTTPFileSystem, clobber=True)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/jupyter.py

@@ -0,0 +1,129 @@
+import base64
+import io
+import re
+
+import requests
+
+import fsspec
+
+
+class JupyterFileSystem(fsspec.AbstractFileSystem):
+    """View of the files as seen by a Jupyter server (notebook or lab)"""
+
+    protocol = ("jupyter", "jlab")
+
+    def __init__(self, url, tok=None, **kwargs):
+        """
+
+        Parameters
+        ----------
+        url : str
+            Base URL of the server, like "http://127.0.0.1:8888". May include
+            token in the string, which is given by the process when starting up
+        tok : str
+            If the token is obtained separately, can be given here
+        kwargs
+        """
+        if "?" in url:
+            if tok is None:
+                try:
+                    tok = re.findall("token=([a-z0-9]+)", url)[0]
+                except IndexError as e:
+                    raise ValueError("Could not determine token") from e
+            url = url.split("?", 1)[0]
+        self.url = url.rstrip("/") + "/api/contents"
+        self.session = requests.Session()
+        if tok:
+            self.session.headers["Authorization"] = f"token {tok}"
+
+        super().__init__(**kwargs)
+
+    def ls(self, path, detail=True, **kwargs):
+        path = self._strip_protocol(path)
+        r = self.session.get(f"{self.url}/{path}")
+        if r.status_code == 404:
+            raise FileNotFoundError(path)
+        r.raise_for_status()
+        out = r.json()
+
+        if out["type"] == "directory":
+            out = out["content"]
+        else:
+            out = [out]
+        for o in out:
+            o["name"] = o.pop("path")
+            o.pop("content")
+            if o["type"] == "notebook":
+                o["type"] = "file"
+        if detail:
+            return out
+        return [o["name"] for o in out]
+
+    def cat_file(self, path, start=None, end=None, **kwargs):
+        path = self._strip_protocol(path)
+        r = self.session.get(f"{self.url}/{path}")
+        if r.status_code == 404:
+            raise FileNotFoundError(path)
+        r.raise_for_status()
+        out = r.json()
+        if out["format"] == "text":
+            # data should be binary
+            b = out["content"].encode()
+        else:
+            b = base64.b64decode(out["content"])
+        return b[start:end]
+
+    def pipe_file(self, path, value, **_):
+        path = self._strip_protocol(path)
+        json = {
+            "name": path.rsplit("/", 1)[-1],
+            "path": path,
+            "size": len(value),
+            "content": base64.b64encode(value).decode(),
+            "format": "base64",
+            "type": "file",
+        }
+        self.session.put(f"{self.url}/{path}", json=json)
+
+    def mkdir(self, path, create_parents=True, **kwargs):
+        path = self._strip_protocol(path)
+        if create_parents and "/" in path:
+            self.mkdir(path.rsplit("/", 1)[0], True)
+        json = {
+            "name": path.rsplit("/", 1)[-1],
+            "path": path,
+            "size": None,
+            "content": None,
+            "type": "directory",
+        }
+        self.session.put(f"{self.url}/{path}", json=json)
+
+    def mv(self, path1, path2, recursive=False, maxdepth=None, **kwargs):
+        if path1 == path2:
+            return
+        self.session.patch(f"{self.url}/{path1}", json={"path": path2})
+
+    def _rm(self, path):
+        path = self._strip_protocol(path)
+        self.session.delete(f"{self.url}/{path}")
+
+    def _open(self, path, mode="rb", **kwargs):
+        path = self._strip_protocol(path)
+        if mode == "rb":
+            data = self.cat_file(path)
+            return io.BytesIO(data)
+        else:
+            return SimpleFileWriter(self, path, mode="wb")
+
+
+class SimpleFileWriter(fsspec.spec.AbstractBufferedFile):
+    def _upload_chunk(self, final=False):
+        """Never uploads a chunk until file is done
+
+        Not suitable for large files
+        """
+        if final is False:
+            return False
+        self.buffer.seek(0)
+        data = self.buffer.read()
+        self.fs.pipe_file(self.path, data)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/libarchive.py

@@ -0,0 +1,213 @@
+from contextlib import contextmanager
+from ctypes import (
+    CFUNCTYPE,
+    POINTER,
+    c_int,
+    c_longlong,
+    c_void_p,
+    cast,
+    create_string_buffer,
+)
+
+import libarchive
+import libarchive.ffi as ffi
+
+from fsspec import open_files
+from fsspec.archive import AbstractArchiveFileSystem
+from fsspec.implementations.memory import MemoryFile
+from fsspec.utils import DEFAULT_BLOCK_SIZE
+
+# Libarchive requires seekable files or memory only for certain archive
+# types. However, since we read the directory first to cache the contents
+# and also allow random access to any file, the file-like object needs
+# to be seekable no matter what.
+
+# Seek call-backs (not provided in the libarchive python wrapper)
+SEEK_CALLBACK = CFUNCTYPE(c_longlong, c_int, c_void_p, c_longlong, c_int)
+read_set_seek_callback = ffi.ffi(
+    "read_set_seek_callback", [ffi.c_archive_p, SEEK_CALLBACK], c_int, ffi.check_int
+)
+new_api = hasattr(ffi, "NO_OPEN_CB")
+
+
+@contextmanager
+def custom_reader(file, format_name="all", filter_name="all", block_size=ffi.page_size):
+    """Read an archive from a seekable file-like object.
+
+    The `file` object must support the standard `readinto` and 'seek' methods.
+    """
+    buf = create_string_buffer(block_size)
+    buf_p = cast(buf, c_void_p)
+
+    def read_func(archive_p, context, ptrptr):
+        # readinto the buffer, returns number of bytes read
+        length = file.readinto(buf)
+        # write the address of the buffer into the pointer
+        ptrptr = cast(ptrptr, POINTER(c_void_p))
+        ptrptr[0] = buf_p
+        # tell libarchive how much data was written into the buffer
+        return length
+
+    def seek_func(archive_p, context, offset, whence):
+        file.seek(offset, whence)
+        # tell libarchvie the current position
+        return file.tell()
+
+    read_cb = ffi.READ_CALLBACK(read_func)
+    seek_cb = SEEK_CALLBACK(seek_func)
+
+    if new_api:
+        open_cb = ffi.NO_OPEN_CB
+        close_cb = ffi.NO_CLOSE_CB
+    else:
+        open_cb = libarchive.read.OPEN_CALLBACK(ffi.VOID_CB)
+        close_cb = libarchive.read.CLOSE_CALLBACK(ffi.VOID_CB)
+
+    with libarchive.read.new_archive_read(format_name, filter_name) as archive_p:
+        read_set_seek_callback(archive_p, seek_cb)
+        ffi.read_open(archive_p, None, open_cb, read_cb, close_cb)
+        yield libarchive.read.ArchiveRead(archive_p)
+
+
+class LibArchiveFileSystem(AbstractArchiveFileSystem):
+    """Compressed archives as a file-system (read-only)
+
+    Supports the following formats:
+    tar, pax , cpio, ISO9660, zip, mtree, shar, ar, raw, xar, lha/lzh, rar
+    Microsoft CAB, 7-Zip, WARC
+
+    See the libarchive documentation for further restrictions.
+    https://www.libarchive.org/
+
+    Keeps file object open while instance lives. It only works in seekable
+    file-like objects. In case the filesystem does not support this kind of
+    file object, it is recommended to cache locally.
+
+    This class is pickleable, but not necessarily thread-safe (depends on the
+    platform). See libarchive documentation for details.
+    """
+
+    root_marker = ""
+    protocol = "libarchive"
+    cachable = False
+
+    def __init__(
+        self,
+        fo="",
+        mode="r",
+        target_protocol=None,
+        target_options=None,
+        block_size=DEFAULT_BLOCK_SIZE,
+        **kwargs,
+    ):
+        """
+        Parameters
+        ----------
+        fo: str or file-like
+            Contains ZIP, and must exist. If a str, will fetch file using
+            :meth:`~fsspec.open_files`, which must return one file exactly.
+        mode: str
+            Currently, only 'r' accepted
+        target_protocol: str (optional)
+            If ``fo`` is a string, this value can be used to override the
+            FS protocol inferred from a URL
+        target_options: dict (optional)
+            Kwargs passed when instantiating the target FS, if ``fo`` is
+            a string.
+        """
+        super().__init__(self, **kwargs)
+        if mode != "r":
+            raise ValueError("Only read from archive files accepted")
+        if isinstance(fo, str):
+            files = open_files(fo, protocol=target_protocol, **(target_options or {}))
+            if len(files) != 1:
+                raise ValueError(
+                    f'Path "{fo}" did not resolve to exactly one file: "{files}"'
+                )
+            fo = files[0]
+        self.of = fo
+        self.fo = fo.__enter__()  # the whole instance is a context
+        self.block_size = block_size
+        self.dir_cache = None
+
+    @contextmanager
+    def _open_archive(self):
+        self.fo.seek(0)
+        with custom_reader(self.fo, block_size=self.block_size) as arc:
+            yield arc
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        # file paths are always relative to the archive root
+        return super()._strip_protocol(path).lstrip("/")
+
+    def _get_dirs(self):
+        fields = {
+            "name": "pathname",
+            "size": "size",
+            "created": "ctime",
+            "mode": "mode",
+            "uid": "uid",
+            "gid": "gid",
+            "mtime": "mtime",
+        }
+
+        if self.dir_cache is not None:
+            return
+
+        self.dir_cache = {}
+        list_names = []
+        with self._open_archive() as arc:
+            for entry in arc:
+                if not entry.isdir and not entry.isfile:
+                    # Skip symbolic links, fifo entries, etc.
+                    continue
+                self.dir_cache.update(
+                    {
+                        dirname: {"name": dirname, "size": 0, "type": "directory"}
+                        for dirname in self._all_dirnames(set(entry.name))
+                    }
+                )
+                f = {key: getattr(entry, fields[key]) for key in fields}
+                f["type"] = "directory" if entry.isdir else "file"
+                list_names.append(entry.name)
+
+                self.dir_cache[f["name"]] = f
+        # libarchive does not seem to return an entry for the directories (at least
+        # not in all formats), so get the directories names from the files names
+        self.dir_cache.update(
+            {
+                dirname: {"name": dirname, "size": 0, "type": "directory"}
+                for dirname in self._all_dirnames(list_names)
+            }
+        )
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=True,
+        cache_options=None,
+        **kwargs,
+    ):
+        path = self._strip_protocol(path)
+        if mode != "rb":
+            raise NotImplementedError
+
+        data = bytes()
+        with self._open_archive() as arc:
+            for entry in arc:
+                if entry.pathname != path:
+                    continue
+
+                if entry.size == 0:
+                    # empty file, so there are no blocks
+                    break
+
+                for block in entry.get_blocks(entry.size):
+                    data = block
+                    break
+                else:
+                    raise ValueError
+        return MemoryFile(fs=self, path=path, data=data)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/local.py

@@ -0,0 +1,514 @@
+import datetime
+import io
+import logging
+import os
+import os.path as osp
+import shutil
+import stat
+import tempfile
+from functools import lru_cache
+
+from fsspec import AbstractFileSystem
+from fsspec.compression import compr
+from fsspec.core import get_compression
+from fsspec.utils import isfilelike, stringify_path
+
+logger = logging.getLogger("fsspec.local")
+
+
+class LocalFileSystem(AbstractFileSystem):
+    """Interface to files on local storage
+
+    Parameters
+    ----------
+    auto_mkdir: bool
+        Whether, when opening a file, the directory containing it should
+        be created (if it doesn't already exist). This is assumed by pyarrow
+        code.
+    """
+
+    root_marker = "/"
+    protocol = "file", "local"
+    local_file = True
+
+    def __init__(self, auto_mkdir=False, **kwargs):
+        super().__init__(**kwargs)
+        self.auto_mkdir = auto_mkdir
+
+    @property
+    def fsid(self):
+        return "local"
+
+    def mkdir(self, path, create_parents=True, **kwargs):
+        path = self._strip_protocol(path)
+        if self.exists(path):
+            raise FileExistsError(path)
+        if create_parents:
+            self.makedirs(path, exist_ok=True)
+        else:
+            os.mkdir(path, **kwargs)
+
+    def makedirs(self, path, exist_ok=False):
+        path = self._strip_protocol(path)
+        os.makedirs(path, exist_ok=exist_ok)
+
+    def rmdir(self, path):
+        path = self._strip_protocol(path)
+        os.rmdir(path)
+
+    def ls(self, path, detail=False, **kwargs):
+        path = self._strip_protocol(path)
+        path_info = self.info(path)
+        infos = []
+        if path_info["type"] == "directory":
+            with os.scandir(path) as it:
+                for f in it:
+                    try:
+                        # Only get the info if requested since it is a bit expensive (the stat call inside)
+                        # The strip_protocol is also used in info() and calls make_path_posix to always return posix paths
+                        info = self.info(f) if detail else self._strip_protocol(f.path)
+                        infos.append(info)
+                    except FileNotFoundError:
+                        pass
+        else:
+            infos = [path_info] if detail else [path_info["name"]]
+
+        return infos
+
+    def info(self, path, **kwargs):
+        if isinstance(path, os.DirEntry):
+            # scandir DirEntry
+            out = path.stat(follow_symlinks=False)
+            link = path.is_symlink()
+            if path.is_dir(follow_symlinks=False):
+                t = "directory"
+            elif path.is_file(follow_symlinks=False):
+                t = "file"
+            else:
+                t = "other"
+
+            size = out.st_size
+            if link:
+                try:
+                    out2 = path.stat(follow_symlinks=True)
+                    size = out2.st_size
+                except OSError:
+                    size = 0
+            path = self._strip_protocol(path.path)
+        else:
+            # str or path-like
+            path = self._strip_protocol(path)
+            out = os.stat(path, follow_symlinks=False)
+            link = stat.S_ISLNK(out.st_mode)
+            if link:
+                out = os.stat(path, follow_symlinks=True)
+            size = out.st_size
+            if stat.S_ISDIR(out.st_mode):
+                t = "directory"
+            elif stat.S_ISREG(out.st_mode):
+                t = "file"
+            else:
+                t = "other"
+
+        # Check for the 'st_birthtime' attribute, which is not always present; fallback to st_ctime
+        created_time = getattr(out, "st_birthtime", out.st_ctime)
+
+        result = {
+            "name": path,
+            "size": size,
+            "type": t,
+            "created": created_time,
+            "islink": link,
+        }
+        for field in ["mode", "uid", "gid", "mtime", "ino", "nlink"]:
+            result[field] = getattr(out, f"st_{field}")
+        if link:
+            result["destination"] = os.readlink(path)
+        return result
+
+    def lexists(self, path, **kwargs):
+        return osp.lexists(path)
+
+    def cp_file(self, path1, path2, **kwargs):
+        path1 = self._strip_protocol(path1)
+        path2 = self._strip_protocol(path2)
+        if self.auto_mkdir:
+            self.makedirs(self._parent(path2), exist_ok=True)
+        if self.isfile(path1):
+            shutil.copyfile(path1, path2)
+        elif self.isdir(path1):
+            self.mkdirs(path2, exist_ok=True)
+        else:
+            raise FileNotFoundError(path1)
+
+    def isfile(self, path):
+        path = self._strip_protocol(path)
+        return os.path.isfile(path)
+
+    def isdir(self, path):
+        path = self._strip_protocol(path)
+        return os.path.isdir(path)
+
+    def get_file(self, path1, path2, callback=None, **kwargs):
+        if isfilelike(path2):
+            with open(path1, "rb") as f:
+                shutil.copyfileobj(f, path2)
+        else:
+            return self.cp_file(path1, path2, **kwargs)
+
+    def put_file(self, path1, path2, callback=None, **kwargs):
+        return self.cp_file(path1, path2, **kwargs)
+
+    def mv(self, path1, path2, recursive: bool = True, **kwargs):
+        """Move files/directories
+        For the specific case of local, all ops on directories are recursive and
+        the recursive= kwarg is ignored.
+        """
+        path1 = self._strip_protocol(path1)
+        path2 = self._strip_protocol(path2)
+        shutil.move(path1, path2)
+
+    def link(self, src, dst, **kwargs):
+        src = self._strip_protocol(src)
+        dst = self._strip_protocol(dst)
+        os.link(src, dst, **kwargs)
+
+    def symlink(self, src, dst, **kwargs):
+        src = self._strip_protocol(src)
+        dst = self._strip_protocol(dst)
+        os.symlink(src, dst, **kwargs)
+
+    def islink(self, path) -> bool:
+        return os.path.islink(self._strip_protocol(path))
+
+    def rm_file(self, path):
+        os.remove(self._strip_protocol(path))
+
+    def rm(self, path, recursive=False, maxdepth=None):
+        if not isinstance(path, list):
+            path = [path]
+
+        for p in path:
+            p = self._strip_protocol(p)
+            if self.isdir(p):
+                if not recursive:
+                    raise ValueError("Cannot delete directory, set recursive=True")
+                if osp.abspath(p) == os.getcwd():
+                    raise ValueError("Cannot delete current working directory")
+                shutil.rmtree(p)
+            else:
+                os.remove(p)
+
+    def unstrip_protocol(self, name):
+        name = self._strip_protocol(name)  # normalise for local/win/...
+        return f"file://{name}"
+
+    def _open(self, path, mode="rb", block_size=None, **kwargs):
+        path = self._strip_protocol(path)
+        if self.auto_mkdir and "w" in mode:
+            self.makedirs(self._parent(path), exist_ok=True)
+        return LocalFileOpener(path, mode, fs=self, **kwargs)
+
+    def touch(self, path, truncate=True, **kwargs):
+        path = self._strip_protocol(path)
+        if self.auto_mkdir:
+            self.makedirs(self._parent(path), exist_ok=True)
+        if self.exists(path):
+            os.utime(path, None)
+        else:
+            open(path, "a").close()
+        if truncate:
+            os.truncate(path, 0)
+
+    def created(self, path):
+        info = self.info(path=path)
+        return datetime.datetime.fromtimestamp(
+            info["created"], tz=datetime.timezone.utc
+        )
+
+    def modified(self, path):
+        info = self.info(path=path)
+        return datetime.datetime.fromtimestamp(info["mtime"], tz=datetime.timezone.utc)
+
+    @classmethod
+    def _parent(cls, path):
+        path = cls._strip_protocol(path)
+        if os.sep == "/":
+            # posix native
+            return path.rsplit("/", 1)[0] or "/"
+        else:
+            # NT
+            path_ = path.rsplit("/", 1)[0]
+            if len(path_) <= 3:
+                if path_[1:2] == ":":
+                    # nt root (something like c:/)
+                    return path_[0] + ":/"
+            # More cases may be required here
+            return path_
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        path = stringify_path(path)
+        if path.startswith("file://"):
+            path = path[7:]
+        elif path.startswith("file:"):
+            path = path[5:]
+        elif path.startswith("local://"):
+            path = path[8:]
+        elif path.startswith("local:"):
+            path = path[6:]
+
+        path = make_path_posix(path)
+        if os.sep != "/":
+            # This code-path is a stripped down version of
+            # > drive, path = ntpath.splitdrive(path)
+            if path[1:2] == ":":
+                # Absolute drive-letter path, e.g. X:\Windows
+                # Relative path with drive, e.g. X:Windows
+                drive, path = path[:2], path[2:]
+            elif path[:2] == "//":
+                # UNC drives, e.g. \\server\share or \\?\UNC\server\share
+                # Device drives, e.g. \\.\device or \\?\device
+                if (index1 := path.find("/", 2)) == -1 or (
+                    index2 := path.find("/", index1 + 1)
+                ) == -1:
+                    drive, path = path, ""
+                else:
+                    drive, path = path[:index2], path[index2:]
+            else:
+                # Relative path, e.g. Windows
+                drive = ""
+
+            path = path.rstrip("/") or cls.root_marker
+            return drive + path
+
+        else:
+            return path.rstrip("/") or cls.root_marker
+
+    def _isfilestore(self):
+        # Inheriting from DaskFileSystem makes this False (S3, etc. were)
+        # the original motivation. But we are a posix-like file system.
+        # See https://github.com/dask/dask/issues/5526
+        return True
+
+    def chmod(self, path, mode):
+        path = stringify_path(path)
+        return os.chmod(path, mode)
+
+
+def make_path_posix(path):
+    """Make path generic and absolute for current OS"""
+    if not isinstance(path, str):
+        if isinstance(path, (list, set, tuple)):
+            return type(path)(make_path_posix(p) for p in path)
+        else:
+            path = stringify_path(path)
+            if not isinstance(path, str):
+                raise TypeError(f"could not convert {path!r} to string")
+    if os.sep == "/":
+        # Native posix
+        if path.startswith("/"):
+            # most common fast case for posix
+            return path
+        elif path.startswith("~"):
+            return osp.expanduser(path)
+        elif path.startswith("./"):
+            path = path[2:]
+        elif path == ".":
+            path = ""
+        return f"{os.getcwd()}/{path}"
+    else:
+        # NT handling
+        if path[0:1] == "/" and path[2:3] == ":":
+            # path is like "/c:/local/path"
+            path = path[1:]
+        if path[1:2] == ":":
+            # windows full path like "C:\\local\\path"
+            if len(path) <= 3:
+                # nt root (something like c:/)
+                return path[0] + ":/"
+            path = path.replace("\\", "/")
+            return path
+        elif path[0:1] == "~":
+            return make_path_posix(osp.expanduser(path))
+        elif path.startswith(("\\\\", "//")):
+            # windows UNC/DFS-style paths
+            return "//" + path[2:].replace("\\", "/")
+        elif path.startswith(("\\", "/")):
+            # windows relative path with root
+            path = path.replace("\\", "/")
+            return f"{osp.splitdrive(os.getcwd())[0]}{path}"
+        else:
+            path = path.replace("\\", "/")
+            if path.startswith("./"):
+                path = path[2:]
+            elif path == ".":
+                path = ""
+            return f"{make_path_posix(os.getcwd())}/{path}"
+
+
+def trailing_sep(path):
+    """Return True if the path ends with a path separator.
+
+    A forward slash is always considered a path separator, even on Operating
+    Systems that normally use a backslash.
+    """
+    # TODO: if all incoming paths were posix-compliant then separator would
+    # always be a forward slash, simplifying this function.
+    # See https://github.com/fsspec/filesystem_spec/pull/1250
+    return path.endswith(os.sep) or (os.altsep is not None and path.endswith(os.altsep))
+
+
+@lru_cache(maxsize=1)
+def get_umask(mask: int = 0o666) -> int:
+    """Get the current umask.
+
+    Follows https://stackoverflow.com/a/44130549 to get the umask.
+    Temporarily sets the umask to the given value, and then resets it to the
+    original value.
+    """
+    value = os.umask(mask)
+    os.umask(value)
+    return value
+
+
+class LocalFileOpener(io.IOBase):
+    def __init__(
+        self, path, mode, autocommit=True, fs=None, compression=None, **kwargs
+    ):
+        logger.debug("open file: %s", path)
+        self.path = path
+        self.mode = mode
+        self.fs = fs
+        self.f = None
+        self.autocommit = autocommit
+        self.compression = get_compression(path, compression)
+        self.blocksize = io.DEFAULT_BUFFER_SIZE
+        self._open()
+
+    def _open(self):
+        if self.f is None or self.f.closed:
+            if self.autocommit or "w" not in self.mode:
+                self.f = open(self.path, mode=self.mode)
+                if self.compression:
+                    compress = compr[self.compression]
+                    self.f = compress(self.f, mode=self.mode)
+            else:
+                # TODO: check if path is writable?
+                i, name = tempfile.mkstemp()
+                os.close(i)  # we want normal open and normal buffered file
+                self.temp = name
+                self.f = open(name, mode=self.mode)
+            if "w" not in self.mode:
+                self.size = self.f.seek(0, 2)
+                self.f.seek(0)
+                self.f.size = self.size
+
+    def _fetch_range(self, start, end):
+        # probably only used by cached FS
+        if "r" not in self.mode:
+            raise ValueError
+        self._open()
+        self.f.seek(start)
+        return self.f.read(end - start)
+
+    def __setstate__(self, state):
+        self.f = None
+        loc = state.pop("loc", None)
+        self.__dict__.update(state)
+        if "r" in state["mode"]:
+            self.f = None
+            self._open()
+            self.f.seek(loc)
+
+    def __getstate__(self):
+        d = self.__dict__.copy()
+        d.pop("f")
+        if "r" in self.mode:
+            d["loc"] = self.f.tell()
+        else:
+            if not self.f.closed:
+                raise ValueError("Cannot serialise open write-mode local file")
+        return d
+
+    def commit(self):
+        if self.autocommit:
+            raise RuntimeError("Can only commit if not already set to autocommit")
+        try:
+            shutil.move(self.temp, self.path)
+        except PermissionError as e:
+            # shutil.move raises PermissionError if os.rename
+            # and the default copy2 fallback with shutil.copystats fail.
+            # The file should be there nonetheless, but without copied permissions.
+            # If it doesn't exist, there was no permission to create the file.
+            if not os.path.exists(self.path):
+                raise e
+        else:
+            # If PermissionError is not raised, permissions can be set.
+            try:
+                mask = 0o666
+                os.chmod(self.path, mask & ~get_umask(mask))
+            except RuntimeError:
+                pass
+
+    def discard(self):
+        if self.autocommit:
+            raise RuntimeError("Cannot discard if set to autocommit")
+        os.remove(self.temp)
+
+    def readable(self) -> bool:
+        return True
+
+    def writable(self) -> bool:
+        return "r" not in self.mode
+
+    def read(self, *args, **kwargs):
+        return self.f.read(*args, **kwargs)
+
+    def write(self, *args, **kwargs):
+        return self.f.write(*args, **kwargs)
+
+    def tell(self, *args, **kwargs):
+        return self.f.tell(*args, **kwargs)
+
+    def seek(self, *args, **kwargs):
+        return self.f.seek(*args, **kwargs)
+
+    def seekable(self, *args, **kwargs):
+        return self.f.seekable(*args, **kwargs)
+
+    def readline(self, *args, **kwargs):
+        return self.f.readline(*args, **kwargs)
+
+    def readlines(self, *args, **kwargs):
+        return self.f.readlines(*args, **kwargs)
+
+    def close(self):
+        return self.f.close()
+
+    def truncate(self, size=None) -> int:
+        return self.f.truncate(size)
+
+    @property
+    def closed(self):
+        return self.f.closed
+
+    def fileno(self):
+        return self.raw.fileno()
+
+    def flush(self) -> None:
+        self.f.flush()
+
+    def __iter__(self):
+        return self.f.__iter__()
+
+    def __getattr__(self, item):
+        return getattr(self.f, item)
+
+    def __enter__(self):
+        self._incontext = True
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self._incontext = False
+        self.f.__exit__(exc_type, exc_value, traceback)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/memory.py

@@ -0,0 +1,311 @@
+from __future__ import annotations
+
+import logging
+from datetime import datetime, timezone
+from errno import ENOTEMPTY
+from io import BytesIO
+from pathlib import PurePath, PureWindowsPath
+from typing import Any, ClassVar
+
+from fsspec import AbstractFileSystem
+from fsspec.implementations.local import LocalFileSystem
+from fsspec.utils import stringify_path
+
+logger = logging.getLogger("fsspec.memoryfs")
+
+
+class MemoryFileSystem(AbstractFileSystem):
+    """A filesystem based on a dict of BytesIO objects
+
+    This is a global filesystem so instances of this class all point to the same
+    in memory filesystem.
+    """
+
+    store: ClassVar[dict[str, Any]] = {}  # global, do not overwrite!
+    pseudo_dirs = [""]  # global, do not overwrite!
+    protocol = "memory"
+    root_marker = "/"
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        if isinstance(path, PurePath):
+            if isinstance(path, PureWindowsPath):
+                return LocalFileSystem._strip_protocol(path)
+            else:
+                path = stringify_path(path)
+
+        path = path.removeprefix("memory://")
+        if "::" in path or "://" in path:
+            return path.rstrip("/")
+        path = path.lstrip("/").rstrip("/")
+        return "/" + path if path else ""
+
+    def ls(self, path, detail=True, **kwargs):
+        path = self._strip_protocol(path)
+        if path in self.store:
+            # there is a key with this exact name
+            if not detail:
+                return [path]
+            return [
+                {
+                    "name": path,
+                    "size": self.store[path].size,
+                    "type": "file",
+                    "created": self.store[path].created.timestamp(),
+                }
+            ]
+        paths = set()
+        starter = path + "/"
+        out = []
+        for p2 in tuple(self.store):
+            if p2.startswith(starter):
+                if "/" not in p2[len(starter) :]:
+                    # exact child
+                    out.append(
+                        {
+                            "name": p2,
+                            "size": self.store[p2].size,
+                            "type": "file",
+                            "created": self.store[p2].created.timestamp(),
+                        }
+                    )
+                elif len(p2) > len(starter):
+                    # implied child directory
+                    ppath = starter + p2[len(starter) :].split("/", 1)[0]
+                    if ppath not in paths:
+                        out = out or []
+                        out.append(
+                            {
+                                "name": ppath,
+                                "size": 0,
+                                "type": "directory",
+                            }
+                        )
+                        paths.add(ppath)
+        for p2 in self.pseudo_dirs:
+            if p2.startswith(starter):
+                if "/" not in p2[len(starter) :]:
+                    # exact child pdir
+                    if p2 not in paths:
+                        out.append({"name": p2, "size": 0, "type": "directory"})
+                        paths.add(p2)
+                else:
+                    # directory implied by deeper pdir
+                    ppath = starter + p2[len(starter) :].split("/", 1)[0]
+                    if ppath not in paths:
+                        out.append({"name": ppath, "size": 0, "type": "directory"})
+                        paths.add(ppath)
+        if not out:
+            if path in self.pseudo_dirs:
+                # empty dir
+                return []
+            raise FileNotFoundError(path)
+        if detail:
+            return out
+        return sorted([f["name"] for f in out])
+
+    def mkdir(self, path, create_parents=True, **kwargs):
+        path = self._strip_protocol(path)
+        if path in self.store or path in self.pseudo_dirs:
+            raise FileExistsError(path)
+        if self._parent(path).strip("/") and self.isfile(self._parent(path)):
+            raise NotADirectoryError(self._parent(path))
+        if create_parents and self._parent(path).strip("/"):
+            try:
+                self.mkdir(self._parent(path), create_parents, **kwargs)
+            except FileExistsError:
+                pass
+        if path and path not in self.pseudo_dirs:
+            self.pseudo_dirs.append(path)
+
+    def makedirs(self, path, exist_ok=False):
+        try:
+            self.mkdir(path, create_parents=True)
+        except FileExistsError:
+            if not exist_ok:
+                raise
+
+    def pipe_file(self, path, value, mode="overwrite", **kwargs):
+        """Set the bytes of given file
+
+        Avoids copies of the data if possible
+        """
+        mode = "xb" if mode == "create" else "wb"
+        self.open(path, mode=mode, data=value)
+
+    def rmdir(self, path):
+        path = self._strip_protocol(path)
+        if path == "":
+            # silently avoid deleting FS root
+            return
+        if path in self.pseudo_dirs:
+            if not self.ls(path):
+                self.pseudo_dirs.remove(path)
+            else:
+                raise OSError(ENOTEMPTY, "Directory not empty", path)
+        else:
+            raise FileNotFoundError(path)
+
+    def info(self, path, **kwargs):
+        logger.debug("info: %s", path)
+        path = self._strip_protocol(path)
+        if path in self.pseudo_dirs or any(
+            p.startswith(path + "/") for p in list(self.store) + self.pseudo_dirs
+        ):
+            return {
+                "name": path,
+                "size": 0,
+                "type": "directory",
+            }
+        elif path in self.store:
+            filelike = self.store[path]
+            return {
+                "name": path,
+                "size": filelike.size,
+                "type": "file",
+                "created": getattr(filelike, "created", None),
+            }
+        else:
+            raise FileNotFoundError(path)
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=True,
+        cache_options=None,
+        **kwargs,
+    ):
+        path = self._strip_protocol(path)
+        if "x" in mode and self.exists(path):
+            raise FileExistsError
+        if path in self.pseudo_dirs:
+            raise IsADirectoryError(path)
+        parent = path
+        while len(parent) > 1:
+            parent = self._parent(parent)
+            if self.isfile(parent):
+                raise FileExistsError(parent)
+        if mode in ["rb", "ab", "r+b", "a+b"]:
+            if path in self.store:
+                f = self.store[path]
+                if "a" in mode:
+                    # position at the end of file
+                    f.seek(0, 2)
+                else:
+                    # position at the beginning of file
+                    f.seek(0)
+                return f
+            else:
+                raise FileNotFoundError(path)
+        elif mode in {"wb", "w+b", "xb", "x+b"}:
+            if "x" in mode and self.exists(path):
+                raise FileExistsError
+            m = MemoryFile(self, path, kwargs.get("data"))
+            if not self._intrans:
+                m.commit()
+            return m
+        else:
+            name = self.__class__.__name__
+            raise ValueError(f"unsupported file mode for {name}: {mode!r}")
+
+    def cp_file(self, path1, path2, **kwargs):
+        path1 = self._strip_protocol(path1)
+        path2 = self._strip_protocol(path2)
+        if self.isfile(path1):
+            self.store[path2] = MemoryFile(
+                self, path2, self.store[path1].getvalue()
+            )  # implicit copy
+        elif self.isdir(path1):
+            if path2 not in self.pseudo_dirs:
+                self.pseudo_dirs.append(path2)
+        else:
+            raise FileNotFoundError(path1)
+
+    def cat_file(self, path, start=None, end=None, **kwargs):
+        logger.debug("cat: %s", path)
+        path = self._strip_protocol(path)
+        try:
+            return bytes(self.store[path].getbuffer()[start:end])
+        except KeyError as e:
+            raise FileNotFoundError(path) from e
+
+    def _rm(self, path):
+        path = self._strip_protocol(path)
+        try:
+            del self.store[path]
+        except KeyError as e:
+            raise FileNotFoundError(path) from e
+
+    def modified(self, path):
+        path = self._strip_protocol(path)
+        try:
+            return self.store[path].modified
+        except KeyError as e:
+            raise FileNotFoundError(path) from e
+
+    def created(self, path):
+        path = self._strip_protocol(path)
+        try:
+            return self.store[path].created
+        except KeyError as e:
+            raise FileNotFoundError(path) from e
+
+    def isfile(self, path):
+        path = self._strip_protocol(path)
+        return path in self.store
+
+    def rm(self, path, recursive=False, maxdepth=None):
+        if isinstance(path, str):
+            path = self._strip_protocol(path)
+        else:
+            path = [self._strip_protocol(p) for p in path]
+        paths = self.expand_path(path, recursive=recursive, maxdepth=maxdepth)
+        for p in reversed(paths):
+            if self.isfile(p):
+                self.rm_file(p)
+            # If the expanded path doesn't exist, it is only because the expanded
+            # path was a directory that does not exist in self.pseudo_dirs. This
+            # is possible if you directly create files without making the
+            # directories first.
+            elif not self.exists(p):
+                continue
+            else:
+                self.rmdir(p)
+
+
+class MemoryFile(BytesIO):
+    """A BytesIO which can't close and works as a context manager
+
+    Can initialise with data. Each path should only be active once at any moment.
+
+    No need to provide fs, path if auto-committing (default)
+    """
+
+    def __init__(self, fs=None, path=None, data=None):
+        logger.debug("open file %s", path)
+        self.fs = fs
+        self.path = path
+        self.created = datetime.now(tz=timezone.utc)
+        self.modified = datetime.now(tz=timezone.utc)
+        if data:
+            super().__init__(data)
+            self.seek(0)
+
+    @property
+    def size(self):
+        return self.getbuffer().nbytes
+
+    def __enter__(self):
+        return self
+
+    def close(self):
+        pass
+
+    def discard(self):
+        pass
+
+    def commit(self):
+        self.fs.store[self.path] = self
+        self.modified = datetime.now(tz=timezone.utc)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/sftp.py

@@ -0,0 +1,187 @@
+import datetime
+import logging
+import os
+import types
+import uuid
+from stat import S_ISDIR, S_ISLNK
+
+import paramiko
+
+from .. import AbstractFileSystem
+from ..utils import infer_storage_options
+
+logger = logging.getLogger("fsspec.sftp")
+
+
+class SFTPFileSystem(AbstractFileSystem):
+    """Files over SFTP/SSH
+
+    Peer-to-peer filesystem over SSH using paramiko.
+
+    Note: if using this with the ``open`` or ``open_files``, with full URLs,
+    there is no way to tell if a path is relative, so all paths are assumed
+    to be absolute.
+    """
+
+    protocol = "sftp", "ssh"
+
+    def __init__(self, host, **ssh_kwargs):
+        """
+
+        Parameters
+        ----------
+        host: str
+            Hostname or IP as a string
+        temppath: str
+            Location on the server to put files, when within a transaction
+        ssh_kwargs: dict
+            Parameters passed on to connection. See details in
+            https://docs.paramiko.org/en/3.3/api/client.html#paramiko.client.SSHClient.connect
+            May include port, username, password...
+        """
+        if self._cached:
+            return
+        super().__init__(**ssh_kwargs)
+        self.temppath = ssh_kwargs.pop("temppath", "/tmp")  # remote temp directory
+        self.host = host
+        self.ssh_kwargs = ssh_kwargs
+        self._connect()
+
+    def _connect(self):
+        logger.debug("Connecting to SFTP server %s", self.host)
+        self.client = paramiko.SSHClient()
+        self.client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+        self.client.connect(self.host, **self.ssh_kwargs)
+        self.ftp = self.client.open_sftp()
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        return infer_storage_options(path)["path"]
+
+    @staticmethod
+    def _get_kwargs_from_urls(urlpath):
+        out = infer_storage_options(urlpath)
+        out.pop("path", None)
+        out.pop("protocol", None)
+        return out
+
+    def mkdir(self, path, create_parents=True, mode=511):
+        path = self._strip_protocol(path)
+        logger.debug("Creating folder %s", path)
+        if self.exists(path):
+            raise FileExistsError(f"File exists: {path}")
+
+        if create_parents:
+            self.makedirs(path)
+        else:
+            self.ftp.mkdir(path, mode)
+
+    def makedirs(self, path, exist_ok=False, mode=511):
+        if self.exists(path) and not exist_ok:
+            raise FileExistsError(f"File exists: {path}")
+
+        parts = path.split("/")
+        new_path = "/" if path[:1] == "/" else ""
+
+        for part in parts:
+            if part:
+                new_path = f"{new_path}/{part}" if new_path else part
+                if not self.exists(new_path):
+                    self.ftp.mkdir(new_path, mode)
+
+    def rmdir(self, path):
+        path = self._strip_protocol(path)
+        logger.debug("Removing folder %s", path)
+        self.ftp.rmdir(path)
+
+    def info(self, path):
+        path = self._strip_protocol(path)
+        stat = self._decode_stat(self.ftp.stat(path))
+        stat["name"] = path
+        return stat
+
+    @staticmethod
+    def _decode_stat(stat, parent_path=None):
+        if S_ISDIR(stat.st_mode):
+            t = "directory"
+        elif S_ISLNK(stat.st_mode):
+            t = "link"
+        else:
+            t = "file"
+        out = {
+            "name": "",
+            "size": stat.st_size,
+            "type": t,
+            "uid": stat.st_uid,
+            "gid": stat.st_gid,
+            "time": datetime.datetime.fromtimestamp(
+                stat.st_atime, tz=datetime.timezone.utc
+            ),
+            "mtime": datetime.datetime.fromtimestamp(
+                stat.st_mtime, tz=datetime.timezone.utc
+            ),
+        }
+        if parent_path:
+            out["name"] = "/".join([parent_path.rstrip("/"), stat.filename])
+        return out
+
+    def ls(self, path, detail=False):
+        path = self._strip_protocol(path)
+        logger.debug("Listing folder %s", path)
+        stats = [self._decode_stat(stat, path) for stat in self.ftp.listdir_iter(path)]
+        if detail:
+            return stats
+        else:
+            paths = [stat["name"] for stat in stats]
+            return sorted(paths)
+
+    def put(self, lpath, rpath, callback=None, **kwargs):
+        rpath = self._strip_protocol(rpath)
+        logger.debug("Put file %s into %s", lpath, rpath)
+        self.ftp.put(lpath, rpath)
+
+    def get_file(self, rpath, lpath, **kwargs):
+        if self.isdir(rpath):
+            os.makedirs(lpath, exist_ok=True)
+        else:
+            self.ftp.get(self._strip_protocol(rpath), lpath)
+
+    def _open(self, path, mode="rb", block_size=None, **kwargs):
+        """
+        block_size: int or None
+            If 0, no buffering, if 1, line buffering, if >1, buffer that many
+            bytes, if None use default from paramiko.
+        """
+        logger.debug("Opening file %s", path)
+        if kwargs.get("autocommit", True) is False:
+            # writes to temporary file, move on commit
+            path2 = "/".join([self.temppath, str(uuid.uuid4())])
+            f = self.ftp.open(path2, mode, bufsize=block_size if block_size else -1)
+            f.temppath = path2
+            f.targetpath = path
+            f.fs = self
+            f.commit = types.MethodType(commit_a_file, f)
+            f.discard = types.MethodType(discard_a_file, f)
+        else:
+            f = self.ftp.open(path, mode, bufsize=block_size if block_size else -1)
+        return f
+
+    def _rm(self, path):
+        if self.isdir(path):
+            self.ftp.rmdir(path)
+        else:
+            self.ftp.remove(path)
+
+    def mv(self, old, new):
+        new = self._strip_protocol(new)
+        old = self._strip_protocol(old)
+        logger.debug("Renaming %s into %s", old, new)
+        self.ftp.posix_rename(old, new)
+
+
+def commit_a_file(self):
+    self.fs.mv(self.temppath, self.targetpath)
+
+
+def discard_a_file(self):
+    self.fs._rm(self.temppath)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/smb.py

@@ -0,0 +1,416 @@
+"""
+This module contains SMBFileSystem class responsible for handling access to
+Windows Samba network shares by using package smbprotocol
+"""
+
+import datetime
+import re
+import uuid
+from stat import S_ISDIR, S_ISLNK
+
+import smbclient
+import smbprotocol.exceptions
+
+from .. import AbstractFileSystem
+from ..utils import infer_storage_options
+
+# ! pylint: disable=bad-continuation
+
+
+class SMBFileSystem(AbstractFileSystem):
+    """Allow reading and writing to Windows and Samba network shares.
+
+    When using `fsspec.open()` for getting a file-like object the URI
+    should be specified as this format:
+    ``smb://workgroup;user:password@server:port/share/folder/file.csv``.
+
+    Example::
+
+        >>> import fsspec
+        >>> with fsspec.open(
+        ...     'smb://myuser:mypassword@myserver.com/' 'share/folder/file.csv'
+        ... ) as smbfile:
+        ...     df = pd.read_csv(smbfile, sep='|', header=None)
+
+    Note that you need to pass in a valid hostname or IP address for the host
+    component of the URL. Do not use the Windows/NetBIOS machine name for the
+    host component.
+
+    The first component of the path in the URL points to the name of the shared
+    folder. Subsequent path components will point to the directory/folder/file.
+
+    The URL components ``workgroup`` , ``user``, ``password`` and ``port`` may be
+    optional.
+
+    .. note::
+
+        For working this source require `smbprotocol`_ to be installed, e.g.::
+
+            $ pip install smbprotocol
+            # or
+            # pip install smbprotocol[kerberos]
+
+    .. _smbprotocol: https://github.com/jborean93/smbprotocol#requirements
+
+    Note: if using this with the ``open`` or ``open_files``, with full URLs,
+    there is no way to tell if a path is relative, so all paths are assumed
+    to be absolute.
+    """
+
+    protocol = "smb"
+
+    # pylint: disable=too-many-arguments
+    def __init__(
+        self,
+        host,
+        port=None,
+        username=None,
+        password=None,
+        timeout=60,
+        encrypt=None,
+        share_access=None,
+        register_session_retries=4,
+        register_session_retry_wait=1,
+        register_session_retry_factor=10,
+        auto_mkdir=False,
+        **kwargs,
+    ):
+        """
+        You can use _get_kwargs_from_urls to get some kwargs from
+        a reasonable SMB url.
+
+        Authentication will be anonymous or integrated if username/password are not
+        given.
+
+        Parameters
+        ----------
+        host: str
+            The remote server name/ip to connect to
+        port: int or None
+            Port to connect with. Usually 445, sometimes 139.
+        username: str or None
+            Username to connect with. Required if Kerberos auth is not being used.
+        password: str or None
+            User's password on the server, if using username
+        timeout: int
+            Connection timeout in seconds
+        encrypt: bool
+            Whether to force encryption or not, once this has been set to True
+            the session cannot be changed back to False.
+        share_access: str or None
+            Specifies the default access applied to file open operations
+            performed with this file system object.
+            This affects whether other processes can concurrently open a handle
+            to the same file.
+
+            - None (the default): exclusively locks the file until closed.
+            - 'r': Allow other handles to be opened with read access.
+            - 'w': Allow other handles to be opened with write access.
+            - 'd': Allow other handles to be opened with delete access.
+        register_session_retries: int
+            Number of retries to register a session with the server. Retries are not performed
+            for authentication errors, as they are considered as invalid credentials and not network
+            issues. If set to negative value, no register attempts will be performed.
+        register_session_retry_wait: int
+            Time in seconds to wait between each retry. Number must be non-negative.
+        register_session_retry_factor: int
+            Base factor for the wait time between each retry. The wait time
+            is calculated using exponential function. For factor=1 all wait times
+            will be equal to `register_session_retry_wait`. For any number of retries,
+            the last wait time will be equal to `register_session_retry_wait` and for retries>1
+            the first wait time will be equal to `register_session_retry_wait / factor`.
+            Number must be equal to or greater than 1. Optimal factor is 10.
+        auto_mkdir: bool
+            Whether, when opening a file, the directory containing it should
+            be created (if it doesn't already exist). This is assumed by pyarrow
+            and zarr-python code.
+        """
+        super().__init__(**kwargs)
+        self.host = host
+        self.port = port
+        self.username = username
+        self.password = password
+        self.timeout = timeout
+        self.encrypt = encrypt
+        self.temppath = kwargs.pop("temppath", "")
+        self.share_access = share_access
+        self.register_session_retries = register_session_retries
+        if register_session_retry_wait < 0:
+            raise ValueError(
+                "register_session_retry_wait must be a non-negative integer"
+            )
+        self.register_session_retry_wait = register_session_retry_wait
+        if register_session_retry_factor < 1:
+            raise ValueError(
+                "register_session_retry_factor must be a positive "
+                "integer equal to or greater than 1"
+            )
+        self.register_session_retry_factor = register_session_retry_factor
+        self.auto_mkdir = auto_mkdir
+        self._connect()
+
+    @property
+    def _port(self):
+        return 445 if self.port is None else self.port
+
+    def _connect(self):
+        import time
+
+        if self.register_session_retries <= -1:
+            return
+
+        retried_errors = []
+
+        wait_time = self.register_session_retry_wait
+        n_waits = (
+            self.register_session_retries - 1
+        )  # -1 = No wait time after the last retry
+        factor = self.register_session_retry_factor
+
+        # Generate wait times for each retry attempt.
+        # Wait times are calculated using exponential function. For factor=1 all wait times
+        # will be equal to `wait`. For any number of retries the last wait time will be
+        # equal to `wait` and for retries>2 the first wait time will be equal to `wait / factor`.
+        wait_times = iter(
+            factor ** (n / n_waits - 1) * wait_time for n in range(0, n_waits + 1)
+        )
+
+        for attempt in range(self.register_session_retries + 1):
+            try:
+                smbclient.register_session(
+                    self.host,
+                    username=self.username,
+                    password=self.password,
+                    port=self._port,
+                    encrypt=self.encrypt,
+                    connection_timeout=self.timeout,
+                )
+                return
+            except (
+                smbprotocol.exceptions.SMBAuthenticationError,
+                smbprotocol.exceptions.LogonFailure,
+            ):
+                # These exceptions should not be repeated, as they clearly indicate
+                # that the credentials are invalid and not a network issue.
+                raise
+            except ValueError as exc:
+                if re.findall(r"\[Errno -\d+]", str(exc)):
+                    # This exception is raised by the smbprotocol.transport:Tcp.connect
+                    # and originates from socket.gaierror (OSError). These exceptions might
+                    # be raised due to network instability. We will retry to connect.
+                    retried_errors.append(exc)
+                else:
+                    # All another ValueError exceptions should be raised, as they are not
+                    # related to network issues.
+                    raise
+            except Exception as exc:
+                # Save the exception and retry to connect. This except might be dropped
+                # in the future, once all exceptions suited for retry are identified.
+                retried_errors.append(exc)
+
+            if attempt < self.register_session_retries:
+                time.sleep(next(wait_times))
+
+        # Raise last exception to inform user about the connection issues.
+        # Note: Should we use ExceptionGroup to raise all exceptions?
+        raise retried_errors[-1]
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        return infer_storage_options(path)["path"]
+
+    @staticmethod
+    def _get_kwargs_from_urls(path):
+        # smb://workgroup;user:password@host:port/share/folder/file.csv
+        out = infer_storage_options(path)
+        out.pop("path", None)
+        out.pop("protocol", None)
+        return out
+
+    def mkdir(self, path, create_parents=True, **kwargs):
+        wpath = _as_unc_path(self.host, path)
+        if create_parents:
+            smbclient.makedirs(wpath, exist_ok=False, port=self._port, **kwargs)
+        else:
+            smbclient.mkdir(wpath, port=self._port, **kwargs)
+
+    def makedirs(self, path, exist_ok=False):
+        if _share_has_path(path):
+            wpath = _as_unc_path(self.host, path)
+            smbclient.makedirs(wpath, exist_ok=exist_ok, port=self._port)
+
+    def rmdir(self, path):
+        if _share_has_path(path):
+            wpath = _as_unc_path(self.host, path)
+            smbclient.rmdir(wpath, port=self._port)
+
+    def info(self, path, **kwargs):
+        wpath = _as_unc_path(self.host, path)
+        stats = smbclient.stat(wpath, port=self._port, **kwargs)
+        if S_ISDIR(stats.st_mode):
+            stype = "directory"
+        elif S_ISLNK(stats.st_mode):
+            stype = "link"
+        else:
+            stype = "file"
+        res = {
+            "name": path + "/" if stype == "directory" else path,
+            "size": stats.st_size,
+            "type": stype,
+            "uid": stats.st_uid,
+            "gid": stats.st_gid,
+            "time": stats.st_atime,
+            "mtime": stats.st_mtime,
+        }
+        return res
+
+    def created(self, path):
+        """Return the created timestamp of a file as a datetime.datetime"""
+        wpath = _as_unc_path(self.host, path)
+        stats = smbclient.stat(wpath, port=self._port)
+        return datetime.datetime.fromtimestamp(stats.st_ctime, tz=datetime.timezone.utc)
+
+    def modified(self, path):
+        """Return the modified timestamp of a file as a datetime.datetime"""
+        wpath = _as_unc_path(self.host, path)
+        stats = smbclient.stat(wpath, port=self._port)
+        return datetime.datetime.fromtimestamp(stats.st_mtime, tz=datetime.timezone.utc)
+
+    def ls(self, path, detail=True, **kwargs):
+        unc = _as_unc_path(self.host, path)
+        listed = smbclient.listdir(unc, port=self._port, **kwargs)
+        dirs = ["/".join([path.rstrip("/"), p]) for p in listed]
+        if detail:
+            dirs = [self.info(d) for d in dirs]
+        return dirs
+
+    # pylint: disable=too-many-arguments
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=-1,
+        autocommit=True,
+        cache_options=None,
+        **kwargs,
+    ):
+        """
+        block_size: int or None
+            If 0, no buffering, 1, line buffering, >1, buffer that many bytes
+
+        Notes
+        -----
+        By specifying 'share_access' in 'kwargs' it is possible to override the
+        default shared access setting applied in the constructor of this object.
+        """
+        if self.auto_mkdir and "w" in mode:
+            self.makedirs(self._parent(path), exist_ok=True)
+        bls = block_size if block_size is not None and block_size >= 0 else -1
+        wpath = _as_unc_path(self.host, path)
+        share_access = kwargs.pop("share_access", self.share_access)
+        if "w" in mode and autocommit is False:
+            temp = _as_temp_path(self.host, path, self.temppath)
+            return SMBFileOpener(
+                wpath, temp, mode, port=self._port, block_size=bls, **kwargs
+            )
+        return smbclient.open_file(
+            wpath,
+            mode,
+            buffering=bls,
+            share_access=share_access,
+            port=self._port,
+            **kwargs,
+        )
+
+    def copy(self, path1, path2, **kwargs):
+        """Copy within two locations in the same filesystem"""
+        wpath1 = _as_unc_path(self.host, path1)
+        wpath2 = _as_unc_path(self.host, path2)
+        if self.auto_mkdir:
+            self.makedirs(self._parent(path2), exist_ok=True)
+        smbclient.copyfile(wpath1, wpath2, port=self._port, **kwargs)
+
+    def _rm(self, path):
+        if _share_has_path(path):
+            wpath = _as_unc_path(self.host, path)
+            stats = smbclient.stat(wpath, port=self._port)
+            if S_ISDIR(stats.st_mode):
+                smbclient.rmdir(wpath, port=self._port)
+            else:
+                smbclient.remove(wpath, port=self._port)
+
+    def mv(self, path1, path2, recursive=None, maxdepth=None, **kwargs):
+        wpath1 = _as_unc_path(self.host, path1)
+        wpath2 = _as_unc_path(self.host, path2)
+        smbclient.rename(wpath1, wpath2, port=self._port, **kwargs)
+
+
+def _as_unc_path(host, path):
+    rpath = path.replace("/", "\\")
+    unc = f"\\\\{host}{rpath}"
+    return unc
+
+
+def _as_temp_path(host, path, temppath):
+    share = path.split("/")[1]
+    temp_file = f"/{share}{temppath}/{uuid.uuid4()}"
+    unc = _as_unc_path(host, temp_file)
+    return unc
+
+
+def _share_has_path(path):
+    parts = path.count("/")
+    if path.endswith("/"):
+        return parts > 2
+    return parts > 1
+
+
+class SMBFileOpener:
+    """writes to remote temporary file, move on commit"""
+
+    def __init__(self, path, temp, mode, port=445, block_size=-1, **kwargs):
+        self.path = path
+        self.temp = temp
+        self.mode = mode
+        self.block_size = block_size
+        self.kwargs = kwargs
+        self.smbfile = None
+        self._incontext = False
+        self.port = port
+        self._open()
+
+    def _open(self):
+        if self.smbfile is None or self.smbfile.closed:
+            self.smbfile = smbclient.open_file(
+                self.temp,
+                self.mode,
+                port=self.port,
+                buffering=self.block_size,
+                **self.kwargs,
+            )
+
+    def commit(self):
+        """Move temp file to definitive on success."""
+        # TODO: use transaction support in SMB protocol
+        smbclient.replace(self.temp, self.path, port=self.port)
+
+    def discard(self):
+        """Remove the temp file on failure."""
+        smbclient.remove(self.temp, port=self.port)
+
+    def __fspath__(self):
+        return self.path
+
+    def __iter__(self):
+        return self.smbfile.__iter__()
+
+    def __getattr__(self, item):
+        return getattr(self.smbfile, item)
+
+    def __enter__(self):
+        self._incontext = True
+        return self.smbfile.__enter__()
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self._incontext = False
+        self.smbfile.__exit__(exc_type, exc_value, traceback)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/tar.py

@@ -0,0 +1,124 @@
+import logging
+import tarfile
+
+import fsspec
+from fsspec.archive import AbstractArchiveFileSystem
+from fsspec.compression import compr
+from fsspec.utils import infer_compression
+
+typemap = {b"0": "file", b"5": "directory"}
+
+logger = logging.getLogger("tar")
+
+
+class TarFileSystem(AbstractArchiveFileSystem):
+    """Compressed Tar archives as a file-system (read-only)
+
+    Supports the following formats:
+    tar.gz, tar.bz2, tar.xz
+    """
+
+    root_marker = ""
+    protocol = "tar"
+    cachable = False
+
+    def __init__(
+        self,
+        fo="",
+        index_store=None,
+        target_options=None,
+        target_protocol=None,
+        compression=None,
+        **kwargs,
+    ):
+        super().__init__(**kwargs)
+        target_options = target_options or {}
+
+        if isinstance(fo, str):
+            self.of = fsspec.open(fo, protocol=target_protocol, **target_options)
+            fo = self.of.open()  # keep the reference
+
+        # Try to infer compression.
+        if compression is None:
+            name = None
+
+            # Try different ways to get hold of the filename. `fo` might either
+            # be a `fsspec.LocalFileOpener`, an `io.BufferedReader` or an
+            # `fsspec.AbstractFileSystem` instance.
+            try:
+                # Amended io.BufferedReader or similar.
+                # This uses a "protocol extension" where original filenames are
+                # propagated to archive-like filesystems in order to let them
+                # infer the right compression appropriately.
+                if hasattr(fo, "original"):
+                    name = fo.original
+
+                # fsspec.LocalFileOpener
+                elif hasattr(fo, "path"):
+                    name = fo.path
+
+                # io.BufferedReader
+                elif hasattr(fo, "name"):
+                    name = fo.name
+
+                # fsspec.AbstractFileSystem
+                elif hasattr(fo, "info"):
+                    name = fo.info()["name"]
+
+            except Exception as ex:
+                logger.warning(
+                    f"Unable to determine file name, not inferring compression: {ex}"
+                )
+
+            if name is not None:
+                compression = infer_compression(name)
+                logger.info(f"Inferred compression {compression} from file name {name}")
+
+        if compression is not None:
+            # TODO: tarfile already implements compression with modes like "'r:gz'",
+            #  but then would seek to offset in the file work?
+            fo = compr[compression](fo)
+
+        self._fo_ref = fo
+        self.fo = fo  # the whole instance is a context
+        self.tar = tarfile.TarFile(fileobj=self.fo)
+        self.dir_cache = None
+
+        self.index_store = index_store
+        self.index = None
+        self._index()
+
+    def _index(self):
+        # TODO: load and set saved index, if exists
+        out = {}
+        for ti in self.tar:
+            info = ti.get_info()
+            info["type"] = typemap.get(info["type"], "file")
+            name = ti.get_info()["name"].rstrip("/")
+            out[name] = (info, ti.offset_data)
+
+        self.index = out
+        # TODO: save index to self.index_store here, if set
+
+    def _get_dirs(self):
+        if self.dir_cache is not None:
+            return
+
+        # This enables ls to get directories as children as well as files
+        self.dir_cache = {
+            dirname: {"name": dirname, "size": 0, "type": "directory"}
+            for dirname in self._all_dirnames(self.tar.getnames())
+        }
+        for member in self.tar.getmembers():
+            info = member.get_info()
+            info["name"] = info["name"].rstrip("/")
+            info["type"] = typemap.get(info["type"], "file")
+            self.dir_cache[info["name"]] = info
+
+    def _open(self, path, mode="rb", **kwargs):
+        if mode != "rb":
+            raise ValueError("Read-only filesystem implementation")
+        details, offset = self.index[path]
+        if details["type"] != "file":
+            raise ValueError("Can only handle regular files")
+        return self.tar.extractfile(path)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/webhdfs.py

@@ -0,0 +1,485 @@
+# https://hadoop.apache.org/docs/r1.0.4/webhdfs.html
+
+import logging
+import os
+import secrets
+import shutil
+import tempfile
+import uuid
+from contextlib import suppress
+from urllib.parse import quote
+
+import requests
+
+from ..spec import AbstractBufferedFile, AbstractFileSystem
+from ..utils import infer_storage_options, tokenize
+
+logger = logging.getLogger("webhdfs")
+
+
+class WebHDFS(AbstractFileSystem):
+    """
+    Interface to HDFS over HTTP using the WebHDFS API. Supports also HttpFS gateways.
+
+    Four auth mechanisms are supported:
+
+    insecure: no auth is done, and the user is assumed to be whoever they
+        say they are (parameter ``user``), or a predefined value such as
+        "dr.who" if not given
+    spnego: when kerberos authentication is enabled, auth is negotiated by
+        requests_kerberos https://github.com/requests/requests-kerberos .
+        This establishes a session based on existing kinit login and/or
+        specified principal/password; parameters are passed with ``kerb_kwargs``
+    token: uses an existing Hadoop delegation token from another secured
+        service. Indeed, this client can also generate such tokens when
+        not insecure. Note that tokens expire, but can be renewed (by a
+        previously specified user) and may allow for proxying.
+    basic-auth: used when both parameter ``user`` and parameter ``password``
+        are provided.
+
+    """
+
+    tempdir = str(tempfile.gettempdir())
+    protocol = "webhdfs", "webHDFS"
+
+    def __init__(
+        self,
+        host,
+        port=50070,
+        kerberos=False,
+        token=None,
+        user=None,
+        password=None,
+        proxy_to=None,
+        kerb_kwargs=None,
+        data_proxy=None,
+        use_https=False,
+        session_cert=None,
+        session_verify=True,
+        **kwargs,
+    ):
+        """
+        Parameters
+        ----------
+        host: str
+            Name-node address
+        port: int
+            Port for webHDFS
+        kerberos: bool
+            Whether to authenticate with kerberos for this connection
+        token: str or None
+            If given, use this token on every call to authenticate. A user
+            and user-proxy may be encoded in the token and should not be also
+            given
+        user: str or None
+            If given, assert the user name to connect with
+        password: str or None
+            If given, assert the password to use for basic auth. If password
+            is provided, user must be provided also
+        proxy_to: str or None
+            If given, the user has the authority to proxy, and this value is
+            the user in who's name actions are taken
+        kerb_kwargs: dict
+            Any extra arguments for HTTPKerberosAuth, see
+            `<https://github.com/requests/requests-kerberos/blob/master/requests_kerberos/kerberos_.py>`_
+        data_proxy: dict, callable or None
+            If given, map data-node addresses. This can be necessary if the
+            HDFS cluster is behind a proxy, running on Docker or otherwise has
+            a mismatch between the host-names given by the name-node and the
+            address by which to refer to them from the client. If a dict,
+            maps host names ``host->data_proxy[host]``; if a callable, full
+            URLs are passed, and function must conform to
+            ``url->data_proxy(url)``.
+        use_https: bool
+            Whether to connect to the Name-node using HTTPS instead of HTTP
+        session_cert: str or Tuple[str, str] or None
+            Path to a certificate file, or tuple of (cert, key) files to use
+            for the requests.Session
+        session_verify: str, bool or None
+            Path to a certificate file to use for verifying the requests.Session.
+        kwargs
+        """
+        if self._cached:
+            return
+        super().__init__(**kwargs)
+        self.url = f"{'https' if use_https else 'http'}://{host}:{port}/webhdfs/v1"
+        self.kerb = kerberos
+        self.kerb_kwargs = kerb_kwargs or {}
+        self.pars = {}
+        self.proxy = data_proxy or {}
+        if token is not None:
+            if user is not None or proxy_to is not None:
+                raise ValueError(
+                    "If passing a delegation token, must not set "
+                    "user or proxy_to, as these are encoded in the"
+                    " token"
+                )
+            self.pars["delegation"] = token
+        self.user = user
+        self.password = password
+
+        if password is not None:
+            if user is None:
+                raise ValueError(
+                    "If passing a password, the user must also be"
+                    "set in order to set up the basic-auth"
+                )
+        else:
+            if user is not None:
+                self.pars["user.name"] = user
+
+        if proxy_to is not None:
+            self.pars["doas"] = proxy_to
+        if kerberos and user is not None:
+            raise ValueError(
+                "If using Kerberos auth, do not specify the "
+                "user, this is handled by kinit."
+            )
+
+        self.session_cert = session_cert
+        self.session_verify = session_verify
+
+        self._connect()
+
+        self._fsid = f"webhdfs_{tokenize(host, port)}"
+
+    @property
+    def fsid(self):
+        return self._fsid
+
+    def _connect(self):
+        self.session = requests.Session()
+
+        if self.session_cert:
+            self.session.cert = self.session_cert
+
+        self.session.verify = self.session_verify
+
+        if self.kerb:
+            from requests_kerberos import HTTPKerberosAuth
+
+            self.session.auth = HTTPKerberosAuth(**self.kerb_kwargs)
+
+        if self.user is not None and self.password is not None:
+            from requests.auth import HTTPBasicAuth
+
+            self.session.auth = HTTPBasicAuth(self.user, self.password)
+
+    def _call(self, op, method="get", path=None, data=None, redirect=True, **kwargs):
+        path = self._strip_protocol(path) if path is not None else ""
+        url = self._apply_proxy(self.url + quote(path, safe="/="))
+        args = kwargs.copy()
+        args.update(self.pars)
+        args["op"] = op.upper()
+        logger.debug("sending %s with %s", url, method)
+        out = self.session.request(
+            method=method.upper(),
+            url=url,
+            params=args,
+            data=data,
+            allow_redirects=redirect,
+        )
+        if out.status_code in [400, 401, 403, 404, 500]:
+            try:
+                err = out.json()
+                msg = err["RemoteException"]["message"]
+                exp = err["RemoteException"]["exception"]
+            except (ValueError, KeyError):
+                pass
+            else:
+                if exp in ["IllegalArgumentException", "UnsupportedOperationException"]:
+                    raise ValueError(msg)
+                elif exp in ["SecurityException", "AccessControlException"]:
+                    raise PermissionError(msg)
+                elif exp in ["FileNotFoundException"]:
+                    raise FileNotFoundError(msg)
+                else:
+                    raise RuntimeError(msg)
+        out.raise_for_status()
+        return out
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=True,
+        replication=None,
+        permissions=None,
+        **kwargs,
+    ):
+        """
+
+        Parameters
+        ----------
+        path: str
+            File location
+        mode: str
+            'rb', 'wb', etc.
+        block_size: int
+            Client buffer size for read-ahead or write buffer
+        autocommit: bool
+            If False, writes to temporary file that only gets put in final
+            location upon commit
+        replication: int
+            Number of copies of file on the cluster, write mode only
+        permissions: str or int
+            posix permissions, write mode only
+        kwargs
+
+        Returns
+        -------
+        WebHDFile instance
+        """
+        block_size = block_size or self.blocksize
+        return WebHDFile(
+            self,
+            path,
+            mode=mode,
+            block_size=block_size,
+            tempdir=self.tempdir,
+            autocommit=autocommit,
+            replication=replication,
+            permissions=permissions,
+        )
+
+    @staticmethod
+    def _process_info(info):
+        info["type"] = info["type"].lower()
+        info["size"] = info["length"]
+        return info
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        return infer_storage_options(path)["path"]
+
+    @staticmethod
+    def _get_kwargs_from_urls(urlpath):
+        out = infer_storage_options(urlpath)
+        out.pop("path", None)
+        out.pop("protocol", None)
+        if "username" in out:
+            out["user"] = out.pop("username")
+        return out
+
+    def info(self, path):
+        out = self._call("GETFILESTATUS", path=path)
+        info = out.json()["FileStatus"]
+        info["name"] = path
+        return self._process_info(info)
+
+    def ls(self, path, detail=False, **kwargs):
+        out = self._call("LISTSTATUS", path=path)
+        infos = out.json()["FileStatuses"]["FileStatus"]
+        for info in infos:
+            self._process_info(info)
+            info["name"] = path.rstrip("/") + "/" + info["pathSuffix"]
+        if detail:
+            return sorted(infos, key=lambda i: i["name"])
+        else:
+            return sorted(info["name"] for info in infos)
+
+    def content_summary(self, path):
+        """Total numbers of files, directories and bytes under path"""
+        out = self._call("GETCONTENTSUMMARY", path=path)
+        return out.json()["ContentSummary"]
+
+    def ukey(self, path):
+        """Checksum info of file, giving method and result"""
+        out = self._call("GETFILECHECKSUM", path=path, redirect=False)
+        if "Location" in out.headers:
+            location = self._apply_proxy(out.headers["Location"])
+            out2 = self.session.get(location)
+            out2.raise_for_status()
+            return out2.json()["FileChecksum"]
+        else:
+            out.raise_for_status()
+            return out.json()["FileChecksum"]
+
+    def home_directory(self):
+        """Get user's home directory"""
+        out = self._call("GETHOMEDIRECTORY")
+        return out.json()["Path"]
+
+    def get_delegation_token(self, renewer=None):
+        """Retrieve token which can give the same authority to other uses
+
+        Parameters
+        ----------
+        renewer: str or None
+            User who may use this token; if None, will be current user
+        """
+        if renewer:
+            out = self._call("GETDELEGATIONTOKEN", renewer=renewer)
+        else:
+            out = self._call("GETDELEGATIONTOKEN")
+        t = out.json()["Token"]
+        if t is None:
+            raise ValueError("No token available for this user/security context")
+        return t["urlString"]
+
+    def renew_delegation_token(self, token):
+        """Make token live longer. Returns new expiry time"""
+        out = self._call("RENEWDELEGATIONTOKEN", method="put", token=token)
+        return out.json()["long"]
+
+    def cancel_delegation_token(self, token):
+        """Stop the token from being useful"""
+        self._call("CANCELDELEGATIONTOKEN", method="put", token=token)
+
+    def chmod(self, path, mod):
+        """Set the permission at path
+
+        Parameters
+        ----------
+        path: str
+            location to set (file or directory)
+        mod: str or int
+            posix epresentation or permission, give as oct string, e.g, '777'
+            or 0o777
+        """
+        self._call("SETPERMISSION", method="put", path=path, permission=mod)
+
+    def chown(self, path, owner=None, group=None):
+        """Change owning user and/or group"""
+        kwargs = {}
+        if owner is not None:
+            kwargs["owner"] = owner
+        if group is not None:
+            kwargs["group"] = group
+        self._call("SETOWNER", method="put", path=path, **kwargs)
+
+    def set_replication(self, path, replication):
+        """
+        Set file replication factor
+
+        Parameters
+        ----------
+        path: str
+            File location (not for directories)
+        replication: int
+            Number of copies of file on the cluster. Should be smaller than
+            number of data nodes; normally 3 on most systems.
+        """
+        self._call("SETREPLICATION", path=path, method="put", replication=replication)
+
+    def mkdir(self, path, **kwargs):
+        self._call("MKDIRS", method="put", path=path)
+
+    def makedirs(self, path, exist_ok=False):
+        if exist_ok is False and self.exists(path):
+            raise FileExistsError(path)
+        self.mkdir(path)
+
+    def mv(self, path1, path2, **kwargs):
+        self._call("RENAME", method="put", path=path1, destination=path2)
+
+    def rm(self, path, recursive=False, **kwargs):
+        self._call(
+            "DELETE",
+            method="delete",
+            path=path,
+            recursive="true" if recursive else "false",
+        )
+
+    def rm_file(self, path, **kwargs):
+        self.rm(path)
+
+    def cp_file(self, lpath, rpath, **kwargs):
+        with self.open(lpath) as lstream:
+            tmp_fname = "/".join([self._parent(rpath), f".tmp.{secrets.token_hex(16)}"])
+            # Perform an atomic copy (stream to a temporary file and
+            # move it to the actual destination).
+            try:
+                with self.open(tmp_fname, "wb") as rstream:
+                    shutil.copyfileobj(lstream, rstream)
+                self.mv(tmp_fname, rpath)
+            except BaseException:
+                with suppress(FileNotFoundError):
+                    self.rm(tmp_fname)
+                raise
+
+    def _apply_proxy(self, location):
+        if self.proxy and callable(self.proxy):
+            location = self.proxy(location)
+        elif self.proxy:
+            # as a dict
+            for k, v in self.proxy.items():
+                location = location.replace(k, v, 1)
+        return location
+
+
+class WebHDFile(AbstractBufferedFile):
+    """A file living in HDFS over webHDFS"""
+
+    def __init__(self, fs, path, **kwargs):
+        super().__init__(fs, path, **kwargs)
+        kwargs = kwargs.copy()
+        if kwargs.get("permissions", None) is None:
+            kwargs.pop("permissions", None)
+        if kwargs.get("replication", None) is None:
+            kwargs.pop("replication", None)
+        self.permissions = kwargs.pop("permissions", 511)
+        tempdir = kwargs.pop("tempdir")
+        if kwargs.pop("autocommit", False) is False:
+            self.target = self.path
+            self.path = os.path.join(tempdir, str(uuid.uuid4()))
+
+    def _upload_chunk(self, final=False):
+        """Write one part of a multi-block file upload
+
+        Parameters
+        ==========
+        final: bool
+            This is the last block, so should complete file, if
+            self.autocommit is True.
+        """
+        out = self.fs.session.post(
+            self.location,
+            data=self.buffer.getvalue(),
+            headers={"content-type": "application/octet-stream"},
+        )
+        out.raise_for_status()
+        return True
+
+    def _initiate_upload(self):
+        """Create remote file/upload"""
+        kwargs = self.kwargs.copy()
+        if "a" in self.mode:
+            op, method = "APPEND", "POST"
+        else:
+            op, method = "CREATE", "PUT"
+            kwargs["overwrite"] = "true"
+        out = self.fs._call(op, method, self.path, redirect=False, **kwargs)
+        location = self.fs._apply_proxy(out.headers["Location"])
+        if "w" in self.mode:
+            # create empty file to append to
+            out2 = self.fs.session.put(
+                location, headers={"content-type": "application/octet-stream"}
+            )
+            out2.raise_for_status()
+            # after creating empty file, change location to append to
+            out2 = self.fs._call("APPEND", "POST", self.path, redirect=False, **kwargs)
+            self.location = self.fs._apply_proxy(out2.headers["Location"])
+
+    def _fetch_range(self, start, end):
+        start = max(start, 0)
+        end = min(self.size, end)
+        if start >= end or start >= self.size:
+            return b""
+        out = self.fs._call(
+            "OPEN", path=self.path, offset=start, length=end - start, redirect=False
+        )
+        out.raise_for_status()
+        if "Location" in out.headers:
+            location = out.headers["Location"]
+            out2 = self.fs.session.get(self.fs._apply_proxy(location))
+            return out2.content
+        else:
+            return out.content
+
+    def commit(self):
+        self.fs.mv(self.path, self.target)
+
+    def discard(self):
+        self.fs.rm(self.path)

backend_service/venv/lib/python3.13/site-packages/fsspec/implementations/zip.py

@@ -0,0 +1,177 @@
+import os
+import zipfile
+
+import fsspec
+from fsspec.archive import AbstractArchiveFileSystem
+
+
+class ZipFileSystem(AbstractArchiveFileSystem):
+    """Read/Write contents of ZIP archive as a file-system
+
+    Keeps file object open while instance lives.
+
+    This class is pickleable, but not necessarily thread-safe
+    """
+
+    root_marker = ""
+    protocol = "zip"
+    cachable = False
+
+    def __init__(
+        self,
+        fo="",
+        mode="r",
+        target_protocol=None,
+        target_options=None,
+        compression=zipfile.ZIP_STORED,
+        allowZip64=True,
+        compresslevel=None,
+        **kwargs,
+    ):
+        """
+        Parameters
+        ----------
+        fo: str or file-like
+            Contains ZIP, and must exist. If a str, will fetch file using
+            :meth:`~fsspec.open_files`, which must return one file exactly.
+        mode: str
+            Accept: "r", "w", "a"
+        target_protocol: str (optional)
+            If ``fo`` is a string, this value can be used to override the
+            FS protocol inferred from a URL
+        target_options: dict (optional)
+            Kwargs passed when instantiating the target FS, if ``fo`` is
+            a string.
+        compression, allowZip64, compresslevel: passed to ZipFile
+            Only relevant when creating a ZIP
+        """
+        super().__init__(self, **kwargs)
+        if mode not in set("rwa"):
+            raise ValueError(f"mode '{mode}' no understood")
+        self.mode = mode
+        if isinstance(fo, (str, os.PathLike)):
+            if mode == "a":
+                m = "r+b"
+            else:
+                m = mode + "b"
+            fo = fsspec.open(
+                fo, mode=m, protocol=target_protocol, **(target_options or {})
+            )
+        self.force_zip_64 = allowZip64
+        self.of = fo
+        self.fo = fo.__enter__()  # the whole instance is a context
+        self.zip = zipfile.ZipFile(
+            self.fo,
+            mode=mode,
+            compression=compression,
+            allowZip64=allowZip64,
+            compresslevel=compresslevel,
+        )
+        self.dir_cache = None
+
+    @classmethod
+    def _strip_protocol(cls, path):
+        # zip file paths are always relative to the archive root
+        return super()._strip_protocol(path).lstrip("/")
+
+    def __del__(self):
+        if hasattr(self, "zip"):
+            self.close()
+            del self.zip
+
+    def close(self):
+        """Commits any write changes to the file. Done on ``del`` too."""
+        self.zip.close()
+
+    def _get_dirs(self):
+        if self.dir_cache is None or self.mode in set("wa"):
+            # when writing, dir_cache is always in the ZipFile's attributes,
+            # not read from the file.
+            files = self.zip.infolist()
+            self.dir_cache = {
+                dirname.rstrip("/"): {
+                    "name": dirname.rstrip("/"),
+                    "size": 0,
+                    "type": "directory",
+                }
+                for dirname in self._all_dirnames(self.zip.namelist())
+            }
+            for z in files:
+                f = {s: getattr(z, s, None) for s in zipfile.ZipInfo.__slots__}
+                f.update(
+                    {
+                        "name": z.filename.rstrip("/"),
+                        "size": z.file_size,
+                        "type": ("directory" if z.is_dir() else "file"),
+                    }
+                )
+                self.dir_cache[f["name"]] = f
+
+    def pipe_file(self, path, value, **kwargs):
+        # override upstream, because we know the exact file size in this case
+        self.zip.writestr(path, value, **kwargs)
+
+    def _open(
+        self,
+        path,
+        mode="rb",
+        block_size=None,
+        autocommit=True,
+        cache_options=None,
+        **kwargs,
+    ):
+        path = self._strip_protocol(path)
+        if "r" in mode and self.mode in set("wa"):
+            if self.exists(path):
+                raise OSError("ZipFS can only be open for reading or writing, not both")
+            raise FileNotFoundError(path)
+        if "r" in self.mode and "w" in mode:
+            raise OSError("ZipFS can only be open for reading or writing, not both")
+        out = self.zip.open(path, mode.strip("b"), force_zip64=self.force_zip_64)
+        if "r" in mode:
+            info = self.info(path)
+            out.size = info["size"]
+            out.name = info["name"]
+        return out
+
+    def find(self, path, maxdepth=None, withdirs=False, detail=False, **kwargs):
+        if maxdepth is not None and maxdepth < 1:
+            raise ValueError("maxdepth must be at least 1")
+
+        # Remove the leading slash, as the zip file paths are always
+        # given without a leading slash
+        path = path.lstrip("/")
+        path_parts = list(filter(lambda s: bool(s), path.split("/")))
+
+        def _matching_starts(file_path):
+            file_parts = filter(lambda s: bool(s), file_path.split("/"))
+            return all(a == b for a, b in zip(path_parts, file_parts))
+
+        self._get_dirs()
+
+        result = {}
+        # To match posix find, if an exact file name is given, we should
+        # return only that file
+        if path in self.dir_cache and self.dir_cache[path]["type"] == "file":
+            result[path] = self.dir_cache[path]
+            return result if detail else [path]
+
+        for file_path, file_info in self.dir_cache.items():
+            if not (path == "" or _matching_starts(file_path)):
+                continue
+
+            if file_info["type"] == "directory":
+                if withdirs:
+                    if file_path not in result:
+                        result[file_path.strip("/")] = file_info
+                continue
+
+            if file_path not in result:
+                result[file_path] = file_info if detail else None
+
+        if maxdepth:
+            path_depth = path.count("/")
+            result = {
+                k: v for k, v in result.items() if k.count("/") - path_depth < maxdepth
+            }
+        return result if detail else sorted(result)

backend_service/venv/lib/python3.13/site-packages/fsspec/json.py

@@ -0,0 +1,117 @@
+import json
+from collections.abc import Mapping, Sequence
+from contextlib import suppress
+from pathlib import PurePath
+from typing import (
+    Any,
+    Callable,
+    ClassVar,
+    Optional,
+)
+
+from .registry import _import_class, get_filesystem_class
+from .spec import AbstractFileSystem
+
+
+class FilesystemJSONEncoder(json.JSONEncoder):
+    include_password: ClassVar[bool] = True
+
+    def default(self, o: Any) -> Any:
+        if isinstance(o, AbstractFileSystem):
+            return o.to_dict(include_password=self.include_password)
+        if isinstance(o, PurePath):
+            cls = type(o)
+            return {"cls": f"{cls.__module__}.{cls.__name__}", "str": str(o)}
+
+        return super().default(o)
+
+    def make_serializable(self, obj: Any) -> Any:
+        """
+        Recursively converts an object so that it can be JSON serialized via
+        :func:`json.dumps` and :func:`json.dump`, without actually calling
+        said functions.
+        """
+        if isinstance(obj, (str, int, float, bool)):
+            return obj
+        if isinstance(obj, Mapping):
+            return {k: self.make_serializable(v) for k, v in obj.items()}
+        if isinstance(obj, Sequence):
+            return [self.make_serializable(v) for v in obj]
+
+        return self.default(obj)
+
+
+class FilesystemJSONDecoder(json.JSONDecoder):
+    def __init__(
+        self,
+        *,
+        object_hook: Optional[Callable[[dict[str, Any]], Any]] = None,
+        parse_float: Optional[Callable[[str], Any]] = None,
+        parse_int: Optional[Callable[[str], Any]] = None,
+        parse_constant: Optional[Callable[[str], Any]] = None,
+        strict: bool = True,
+        object_pairs_hook: Optional[Callable[[list[tuple[str, Any]]], Any]] = None,
+    ) -> None:
+        self.original_object_hook = object_hook
+
+        super().__init__(
+            object_hook=self.custom_object_hook,
+            parse_float=parse_float,
+            parse_int=parse_int,
+            parse_constant=parse_constant,
+            strict=strict,
+            object_pairs_hook=object_pairs_hook,
+        )
+
+    @classmethod
+    def try_resolve_path_cls(cls, dct: dict[str, Any]):
+        with suppress(Exception):
+            fqp = dct["cls"]
+
+            path_cls = _import_class(fqp)
+
+            if issubclass(path_cls, PurePath):
+                return path_cls
+
+        return None
+
+    @classmethod
+    def try_resolve_fs_cls(cls, dct: dict[str, Any]):
+        with suppress(Exception):
+            if "cls" in dct:
+                try:
+                    fs_cls = _import_class(dct["cls"])
+                    if issubclass(fs_cls, AbstractFileSystem):
+                        return fs_cls
+                except Exception:
+                    if "protocol" in dct:  # Fallback if cls cannot be imported
+                        return get_filesystem_class(dct["protocol"])
+
+                    raise
+
+        return None
+
+    def custom_object_hook(self, dct: dict[str, Any]):
+        if "cls" in dct:
+            if (obj_cls := self.try_resolve_fs_cls(dct)) is not None:
+                return AbstractFileSystem.from_dict(dct)
+            if (obj_cls := self.try_resolve_path_cls(dct)) is not None:
+                return obj_cls(dct["str"])
+
+        if self.original_object_hook is not None:
+            return self.original_object_hook(dct)
+
+        return dct
+
+    def unmake_serializable(self, obj: Any) -> Any:
+        """
+        Inverse function of :meth:`FilesystemJSONEncoder.make_serializable`.
+        """
+        if isinstance(obj, dict):
+            obj = self.custom_object_hook(obj)
+        if isinstance(obj, dict):
+            return {k: self.unmake_serializable(v) for k, v in obj.items()}
+        if isinstance(obj, (list, tuple)):
+            return [self.unmake_serializable(v) for v in obj]
+
+        return obj

backend_service/venv/lib/python3.13/site-packages/fsspec/mapping.py

@@ -0,0 +1,251 @@
+import array
+import logging
+import posixpath
+import warnings
+from collections.abc import MutableMapping
+from functools import cached_property
+
+from fsspec.core import url_to_fs
+
+logger = logging.getLogger("fsspec.mapping")
+
+
+class FSMap(MutableMapping):
+    """Wrap a FileSystem instance as a mutable wrapping.
+
+    The keys of the mapping become files under the given root, and the
+    values (which must be bytes) the contents of those files.
+
+    Parameters
+    ----------
+    root: string
+        prefix for all the files
+    fs: FileSystem instance
+    check: bool (=True)
+        performs a touch at the location, to check for write access.
+
+    Examples
+    --------
+    >>> fs = FileSystem(**parameters)  # doctest: +SKIP
+    >>> d = FSMap('my-data/path/', fs)  # doctest: +SKIP
+    or, more likely
+    >>> d = fs.get_mapper('my-data/path/')
+
+    >>> d['loc1'] = b'Hello World'  # doctest: +SKIP
+    >>> list(d.keys())  # doctest: +SKIP
+    ['loc1']
+    >>> d['loc1']  # doctest: +SKIP
+    b'Hello World'
+    """
+
+    def __init__(self, root, fs, check=False, create=False, missing_exceptions=None):
+        self.fs = fs
+        self.root = fs._strip_protocol(root)
+        self._root_key_to_str = fs._strip_protocol(posixpath.join(root, "x"))[:-1]
+        if missing_exceptions is None:
+            missing_exceptions = (
+                FileNotFoundError,
+                IsADirectoryError,
+                NotADirectoryError,
+            )
+        self.missing_exceptions = missing_exceptions
+        self.check = check
+        self.create = create
+        if create:
+            if not self.fs.exists(root):
+                self.fs.mkdir(root)
+        if check:
+            if not self.fs.exists(root):
+                raise ValueError(
+                    f"Path {root} does not exist. Create "
+                    f" with the ``create=True`` keyword"
+                )
+            self.fs.touch(root + "/a")
+            self.fs.rm(root + "/a")
+
+    @cached_property
+    def dirfs(self):
+        """dirfs instance that can be used with the same keys as the mapper"""
+        from .implementations.dirfs import DirFileSystem
+
+        return DirFileSystem(path=self._root_key_to_str, fs=self.fs)
+
+    def clear(self):
+        """Remove all keys below root - empties out mapping"""
+        logger.info("Clear mapping at %s", self.root)
+        try:
+            self.fs.rm(self.root, True)
+            self.fs.mkdir(self.root)
+        except:  # noqa: E722
+            pass
+
+    def getitems(self, keys, on_error="raise"):
+        """Fetch multiple items from the store
+
+        If the backend is async-able, this might proceed concurrently
+
+        Parameters
+        ----------
+        keys: list(str)
+            They keys to be fetched
+        on_error : "raise", "omit", "return"
+            If raise, an underlying exception will be raised (converted to KeyError
+            if the type is in self.missing_exceptions); if omit, keys with exception
+            will simply not be included in the output; if "return", all keys are
+            included in the output, but the value will be bytes or an exception
+            instance.
+
+        Returns
+        -------
+        dict(key, bytes|exception)
+        """
+        keys2 = [self._key_to_str(k) for k in keys]
+        oe = on_error if on_error == "raise" else "return"
+        try:
+            out = self.fs.cat(keys2, on_error=oe)
+            if isinstance(out, bytes):
+                out = {keys2[0]: out}
+        except self.missing_exceptions as e:
+            raise KeyError from e
+        out = {
+            k: (KeyError() if isinstance(v, self.missing_exceptions) else v)
+            for k, v in out.items()
+        }
+        return {
+            key: out[k2] if on_error == "raise" else out.get(k2, KeyError(k2))
+            for key, k2 in zip(keys, keys2)
+            if on_error == "return" or not isinstance(out[k2], BaseException)
+        }
+
+    def setitems(self, values_dict):
+        """Set the values of multiple items in the store
+
+        Parameters
+        ----------
+        values_dict: dict(str, bytes)
+        """
+        values = {self._key_to_str(k): maybe_convert(v) for k, v in values_dict.items()}
+        self.fs.pipe(values)
+
+    def delitems(self, keys):
+        """Remove multiple keys from the store"""
+        self.fs.rm([self._key_to_str(k) for k in keys])
+
+    def _key_to_str(self, key):
+        """Generate full path for the key"""
+        if not isinstance(key, str):
+            # raise TypeError("key must be of type `str`, got `{type(key).__name__}`"
+            warnings.warn(
+                "from fsspec 2023.5 onward FSMap non-str keys will raise TypeError",
+                DeprecationWarning,
+            )
+            if isinstance(key, list):
+                key = tuple(key)
+            key = str(key)
+        return f"{self._root_key_to_str}{key}".rstrip("/")
+
+    def _str_to_key(self, s):
+        """Strip path of to leave key name"""
+        return s[len(self.root) :].lstrip("/")
+
+    def __getitem__(self, key, default=None):
+        """Retrieve data"""
+        k = self._key_to_str(key)
+        try:
+            result = self.fs.cat(k)
+        except self.missing_exceptions as exc:
+            if default is not None:
+                return default
+            raise KeyError(key) from exc
+        return result
+
+    def pop(self, key, default=None):
+        """Pop data"""
+        result = self.__getitem__(key, default)
+        try:
+            del self[key]
+        except KeyError:
+            pass
+        return result
+
+    def __setitem__(self, key, value):
+        """Store value in key"""
+        key = self._key_to_str(key)
+        self.fs.mkdirs(self.fs._parent(key), exist_ok=True)
+        self.fs.pipe_file(key, maybe_convert(value))
+
+    def __iter__(self):
+        return (self._str_to_key(x) for x in self.fs.find(self.root))
+
+    def __len__(self):
+        return len(self.fs.find(self.root))
+
+    def __delitem__(self, key):
+        """Remove key"""
+        try:
+            self.fs.rm(self._key_to_str(key))
+        except Exception as exc:
+            raise KeyError from exc
+
+    def __contains__(self, key):
+        """Does key exist in mapping?"""
+        path = self._key_to_str(key)
+        return self.fs.isfile(path)
+
+    def __reduce__(self):
+        return FSMap, (self.root, self.fs, False, False, self.missing_exceptions)
+
+
+def maybe_convert(value):
+    if isinstance(value, array.array) or hasattr(value, "__array__"):
+        # bytes-like things
+        if hasattr(value, "dtype") and value.dtype.kind in "Mm":
+            # The buffer interface doesn't support datetime64/timdelta64 numpy
+            # arrays
+            value = value.view("int64")
+        value = bytes(memoryview(value))
+    return value
+
+
+def get_mapper(
+    url="",
+    check=False,
+    create=False,
+    missing_exceptions=None,
+    alternate_root=None,
+    **kwargs,
+):
+    """Create key-value interface for given URL and options
+
+    The URL will be of the form "protocol://location" and point to the root
+    of the mapper required. All keys will be file-names below this location,
+    and their values the contents of each key.
+
+    Also accepts compound URLs like zip::s3://bucket/file.zip , see ``fsspec.open``.
+
+    Parameters
+    ----------
+    url: str
+        Root URL of mapping
+    check: bool
+        Whether to attempt to read from the location before instantiation, to
+        check that the mapping does exist
+    create: bool
+        Whether to make the directory corresponding to the root before
+        instantiating
+    missing_exceptions: None or tuple
+        If given, these exception types will be regarded as missing keys and
+        return KeyError when trying to read data. By default, you get
+        (FileNotFoundError, IsADirectoryError, NotADirectoryError)
+    alternate_root: None or str
+        In cases of complex URLs, the parser may fail to pick the correct part
+        for the mapper root, so this arg can override
+
+    Returns
+    -------
+    ``FSMap`` instance, the dict-like key-value store.
+    """
+    # Removing protocol here - could defer to each open() on the backend
+    fs, urlpath = url_to_fs(url, **kwargs)
+    root = alternate_root if alternate_root is not None else urlpath
+    return FSMap(root, fs, check, create, missing_exceptions=missing_exceptions)

backend_service/venv/lib/python3.13/site-packages/fsspec/parquet.py

@@ -0,0 +1,541 @@
+import io
+import json
+import warnings
+
+from .core import url_to_fs
+from .utils import merge_offset_ranges
+
+# Parquet-Specific Utilities for fsspec
+#
+# Most of the functions defined in this module are NOT
+# intended for public consumption. The only exception
+# to this is `open_parquet_file`, which should be used
+# place of `fs.open()` to open parquet-formatted files
+# on remote file systems.
+
+
+def open_parquet_file(
+    path,
+    mode="rb",
+    fs=None,
+    metadata=None,
+    columns=None,
+    row_groups=None,
+    storage_options=None,
+    strict=False,
+    engine="auto",
+    max_gap=64_000,
+    max_block=256_000_000,
+    footer_sample_size=1_000_000,
+    **kwargs,
+):
+    """
+    Return a file-like object for a single Parquet file.
+
+    The specified parquet `engine` will be used to parse the
+    footer metadata, and determine the required byte ranges
+    from the file. The target path will then be opened with
+    the "parts" (`KnownPartsOfAFile`) caching strategy.
+
+    Note that this method is intended for usage with remote
+    file systems, and is unlikely to improve parquet-read
+    performance on local file systems.
+
+    Parameters
+    ----------
+    path: str
+        Target file path.
+    mode: str, optional
+        Mode option to be passed through to `fs.open`. Default is "rb".
+    metadata: Any, optional
+        Parquet metadata object. Object type must be supported
+        by the backend parquet engine. For now, only the "fastparquet"
+        engine supports an explicit `ParquetFile` metadata object.
+        If a metadata object is supplied, the remote footer metadata
+        will not need to be transferred into local memory.
+    fs: AbstractFileSystem, optional
+        Filesystem object to use for opening the file. If nothing is
+        specified, an `AbstractFileSystem` object will be inferred.
+    engine : str, default "auto"
+        Parquet engine to use for metadata parsing. Allowed options
+        include "fastparquet", "pyarrow", and "auto". The specified
+        engine must be installed in the current environment. If
+        "auto" is specified, and both engines are installed,
+        "fastparquet" will take precedence over "pyarrow".
+    columns: list, optional
+        List of all column names that may be read from the file.
+    row_groups : list, optional
+        List of all row-groups that may be read from the file. This
+        may be a list of row-group indices (integers), or it may be
+        a list of `RowGroup` metadata objects (if the "fastparquet"
+        engine is used).
+    storage_options : dict, optional
+        Used to generate an `AbstractFileSystem` object if `fs` was
+        not specified.
+    strict : bool, optional
+        Whether the resulting `KnownPartsOfAFile` cache should
+        fetch reads that go beyond a known byte-range boundary.
+        If `False` (the default), any read that ends outside a
+        known part will be zero padded. Note that using
+        `strict=True` may be useful for debugging.
+    max_gap : int, optional
+        Neighboring byte ranges will only be merged when their
+        inter-range gap is <= `max_gap`. Default is 64KB.
+    max_block : int, optional
+        Neighboring byte ranges will only be merged when the size of
+        the aggregated range is <= `max_block`. Default is 256MB.
+    footer_sample_size : int, optional
+        Number of bytes to read from the end of the path to look
+        for the footer metadata. If the sampled bytes do not contain
+        the footer, a second read request will be required, and
+        performance will suffer. Default is 1MB.
+    **kwargs :
+        Optional key-word arguments to pass to `fs.open`
+    """
+
+    # Make sure we have an `AbstractFileSystem` object
+    # to work with
+    if fs is None:
+        fs = url_to_fs(path, **(storage_options or {}))[0]
+
+    # For now, `columns == []` not supported. Just use
+    # default `open` command with `path` input
+    if columns is not None and len(columns) == 0:
+        return fs.open(path, mode=mode)
+
+    # Set the engine
+    engine = _set_engine(engine)
+
+    # Fetch the known byte ranges needed to read
+    # `columns` and/or `row_groups`
+    data = _get_parquet_byte_ranges(
+        [path],
+        fs,
+        metadata=metadata,
+        columns=columns,
+        row_groups=row_groups,
+        engine=engine,
+        max_gap=max_gap,
+        max_block=max_block,
+        footer_sample_size=footer_sample_size,
+    )
+
+    # Extract file name from `data`
+    fn = next(iter(data)) if data else path
+
+    # Call self.open with "parts" caching
+    options = kwargs.pop("cache_options", {}).copy()
+    return fs.open(
+        fn,
+        mode=mode,
+        cache_type="parts",
+        cache_options={
+            **options,
+            "data": data.get(fn, {}),
+            "strict": strict,
+        },
+        **kwargs,
+    )
+
+
+def _get_parquet_byte_ranges(
+    paths,
+    fs,
+    metadata=None,
+    columns=None,
+    row_groups=None,
+    max_gap=64_000,
+    max_block=256_000_000,
+    footer_sample_size=1_000_000,
+    engine="auto",
+):
+    """Get a dictionary of the known byte ranges needed
+    to read a specific column/row-group selection from a
+    Parquet dataset. Each value in the output dictionary
+    is intended for use as the `data` argument for the
+    `KnownPartsOfAFile` caching strategy of a single path.
+    """
+
+    # Set engine if necessary
+    if isinstance(engine, str):
+        engine = _set_engine(engine)
+
+    # Pass to specialized function if metadata is defined
+    if metadata is not None:
+        # Use the provided parquet metadata object
+        # to avoid transferring/parsing footer metadata
+        return _get_parquet_byte_ranges_from_metadata(
+            metadata,
+            fs,
+            engine,
+            columns=columns,
+            row_groups=row_groups,
+            max_gap=max_gap,
+            max_block=max_block,
+        )
+
+    # Get file sizes asynchronously
+    file_sizes = fs.sizes(paths)
+
+    # Populate global paths, starts, & ends
+    result = {}
+    data_paths = []
+    data_starts = []
+    data_ends = []
+    add_header_magic = True
+    if columns is None and row_groups is None:
+        # We are NOT selecting specific columns or row-groups.
+        #
+        # We can avoid sampling the footers, and just transfer
+        # all file data with cat_ranges
+        for i, path in enumerate(paths):
+            result[path] = {}
+            for b in range(0, file_sizes[i], max_block):
+                data_paths.append(path)
+                data_starts.append(b)
+                data_ends.append(min(b + max_block, file_sizes[i]))
+        add_header_magic = False  # "Magic" should already be included
+    else:
+        # We ARE selecting specific columns or row-groups.
+        #
+        # Gather file footers.
+        # We just take the last `footer_sample_size` bytes of each
+        # file (or the entire file if it is smaller than that)
+        footer_starts = []
+        footer_ends = []
+        for i, path in enumerate(paths):
+            footer_ends.append(file_sizes[i])
+            sample_size = max(0, file_sizes[i] - footer_sample_size)
+            footer_starts.append(sample_size)
+        footer_samples = fs.cat_ranges(paths, footer_starts, footer_ends)
+
+        # Check our footer samples and re-sample if necessary.
+        missing_footer_starts = footer_starts.copy()
+        large_footer = 0
+        for i, path in enumerate(paths):
+            footer_size = int.from_bytes(footer_samples[i][-8:-4], "little")
+            real_footer_start = file_sizes[i] - (footer_size + 8)
+            if real_footer_start < footer_starts[i]:
+                missing_footer_starts[i] = real_footer_start
+                large_footer = max(large_footer, (footer_size + 8))
+        if large_footer:
+            warnings.warn(
+                f"Not enough data was used to sample the parquet footer. "
+                f"Try setting footer_sample_size >= {large_footer}."
+            )
+            for i, block in enumerate(
+                fs.cat_ranges(
+                    paths,
+                    missing_footer_starts,
+                    footer_starts,
+                )
+            ):
+                footer_samples[i] = block + footer_samples[i]
+                footer_starts[i] = missing_footer_starts[i]
+
+        # Calculate required byte ranges for each path
+        for i, path in enumerate(paths):
+            # Deal with small-file case.
+            # Just include all remaining bytes of the file
+            # in a single range.
+            if file_sizes[i] < max_block:
+                if footer_starts[i] > 0:
+                    # Only need to transfer the data if the
+                    # footer sample isn't already the whole file
+                    data_paths.append(path)
+                    data_starts.append(0)
+                    data_ends.append(footer_starts[i])
+                continue
+
+            # Use "engine" to collect data byte ranges
+            path_data_starts, path_data_ends = engine._parquet_byte_ranges(
+                columns,
+                row_groups=row_groups,
+                footer=footer_samples[i],
+                footer_start=footer_starts[i],
+            )
+
+            data_paths += [path] * len(path_data_starts)
+            data_starts += path_data_starts
+            data_ends += path_data_ends
+
+        # Merge adjacent offset ranges
+        data_paths, data_starts, data_ends = merge_offset_ranges(
+            data_paths,
+            data_starts,
+            data_ends,
+            max_gap=max_gap,
+            max_block=max_block,
+            sort=False,  # Should already be sorted
+        )
+
+        # Start by populating `result` with footer samples
+        for i, path in enumerate(paths):
+            result[path] = {(footer_starts[i], footer_ends[i]): footer_samples[i]}
+
+    # Transfer the data byte-ranges into local memory
+    _transfer_ranges(fs, result, data_paths, data_starts, data_ends)
+
+    # Add b"PAR1" to header if necessary
+    if add_header_magic:
+        _add_header_magic(result)
+
+    return result
+
+
+def _get_parquet_byte_ranges_from_metadata(
+    metadata,
+    fs,
+    engine,
+    columns=None,
+    row_groups=None,
+    max_gap=64_000,
+    max_block=256_000_000,
+):
+    """Simplified version of `_get_parquet_byte_ranges` for
+    the case that an engine-specific `metadata` object is
+    provided, and the remote footer metadata does not need to
+    be transferred before calculating the required byte ranges.
+    """
+
+    # Use "engine" to collect data byte ranges
+    data_paths, data_starts, data_ends = engine._parquet_byte_ranges(
+        columns,
+        row_groups=row_groups,
+        metadata=metadata,
+    )
+
+    # Merge adjacent offset ranges
+    data_paths, data_starts, data_ends = merge_offset_ranges(
+        data_paths,
+        data_starts,
+        data_ends,
+        max_gap=max_gap,
+        max_block=max_block,
+        sort=False,  # Should be sorted
+    )
+
+    # Transfer the data byte-ranges into local memory
+    result = {fn: {} for fn in list(set(data_paths))}
+    _transfer_ranges(fs, result, data_paths, data_starts, data_ends)
+
+    # Add b"PAR1" to header
+    _add_header_magic(result)
+
+    return result
+
+
+def _transfer_ranges(fs, blocks, paths, starts, ends):
+    # Use cat_ranges to gather the data byte_ranges
+    ranges = (paths, starts, ends)
+    for path, start, stop, data in zip(*ranges, fs.cat_ranges(*ranges)):
+        blocks[path][(start, stop)] = data
+
+
+def _add_header_magic(data):
+    # Add b"PAR1" to file headers
+    for path in list(data.keys()):
+        add_magic = True
+        for k in data[path]:
+            if k[0] == 0 and k[1] >= 4:
+                add_magic = False
+                break
+        if add_magic:
+            data[path][(0, 4)] = b"PAR1"
+
+
+def _set_engine(engine_str):
+    # Define a list of parquet engines to try
+    if engine_str == "auto":
+        try_engines = ("fastparquet", "pyarrow")
+    elif not isinstance(engine_str, str):
+        raise ValueError(
+            "Failed to set parquet engine! "
+            "Please pass 'fastparquet', 'pyarrow', or 'auto'"
+        )
+    elif engine_str not in ("fastparquet", "pyarrow"):
+        raise ValueError(f"{engine_str} engine not supported by `fsspec.parquet`")
+    else:
+        try_engines = [engine_str]
+
+    # Try importing the engines in `try_engines`,
+    # and choose the first one that succeeds
+    for engine in try_engines:
+        try:
+            if engine == "fastparquet":
+                return FastparquetEngine()
+            elif engine == "pyarrow":
+                return PyarrowEngine()
+        except ImportError:
+            pass
+
+    # Raise an error if a supported parquet engine
+    # was not found
+    raise ImportError(
+        f"The following parquet engines are not installed "
+        f"in your python environment: {try_engines}."
+        f"Please install 'fastparquert' or 'pyarrow' to "
+        f"utilize the `fsspec.parquet` module."
+    )
+
+
+class FastparquetEngine:
+    # The purpose of the FastparquetEngine class is
+    # to check if fastparquet can be imported (on initialization)
+    # and to define a `_parquet_byte_ranges` method. In the
+    # future, this class may also be used to define other
+    # methods/logic that are specific to fastparquet.
+
+    def __init__(self):
+        import fastparquet as fp
+
+        self.fp = fp
+
+    def _row_group_filename(self, row_group, pf):
+        return pf.row_group_filename(row_group)
+
+    def _parquet_byte_ranges(
+        self,
+        columns,
+        row_groups=None,
+        metadata=None,
+        footer=None,
+        footer_start=None,
+    ):
+        # Initialize offset ranges and define ParqetFile metadata
+        pf = metadata
+        data_paths, data_starts, data_ends = [], [], []
+        if pf is None:
+            pf = self.fp.ParquetFile(io.BytesIO(footer))
+
+        # Convert columns to a set and add any index columns
+        # specified in the pandas metadata (just in case)
+        column_set = None if columns is None else set(columns)
+        if column_set is not None and hasattr(pf, "pandas_metadata"):
+            md_index = [
+                ind
+                for ind in pf.pandas_metadata.get("index_columns", [])
+                # Ignore RangeIndex information
+                if not isinstance(ind, dict)
+            ]
+            column_set |= set(md_index)
+
+        # Check if row_groups is a list of integers
+        # or a list of row-group metadata
+        if row_groups and not isinstance(row_groups[0], int):
+            # Input row_groups contains row-group metadata
+            row_group_indices = None
+        else:
+            # Input row_groups contains row-group indices
+            row_group_indices = row_groups
+            row_groups = pf.row_groups
+
+        # Loop through column chunks to add required byte ranges
+        for r, row_group in enumerate(row_groups):
+            # Skip this row-group if we are targeting
+            # specific row-groups
+            if row_group_indices is None or r in row_group_indices:
+                # Find the target parquet-file path for `row_group`
+                fn = self._row_group_filename(row_group, pf)
+
+                for column in row_group.columns:
+                    name = column.meta_data.path_in_schema[0]
+                    # Skip this column if we are targeting a
+                    # specific columns
+                    if column_set is None or name in column_set:
+                        file_offset0 = column.meta_data.dictionary_page_offset
+                        if file_offset0 is None:
+                            file_offset0 = column.meta_data.data_page_offset
+                        num_bytes = column.meta_data.total_compressed_size
+                        if footer_start is None or file_offset0 < footer_start:
+                            data_paths.append(fn)
+                            data_starts.append(file_offset0)
+                            data_ends.append(
+                                min(
+                                    file_offset0 + num_bytes,
+                                    footer_start or (file_offset0 + num_bytes),
+                                )
+                            )
+
+        if metadata:
+            # The metadata in this call may map to multiple
+            # file paths. Need to include `data_paths`
+            return data_paths, data_starts, data_ends
+        return data_starts, data_ends
+
+
+class PyarrowEngine:
+    # The purpose of the PyarrowEngine class is
+    # to check if pyarrow can be imported (on initialization)
+    # and to define a `_parquet_byte_ranges` method. In the
+    # future, this class may also be used to define other
+    # methods/logic that are specific to pyarrow.
+
+    def __init__(self):
+        import pyarrow.parquet as pq
+
+        self.pq = pq
+
+    def _row_group_filename(self, row_group, metadata):
+        raise NotImplementedError
+
+    def _parquet_byte_ranges(
+        self,
+        columns,
+        row_groups=None,
+        metadata=None,
+        footer=None,
+        footer_start=None,
+    ):
+        if metadata is not None:
+            raise ValueError("metadata input not supported for PyarrowEngine")
+
+        data_starts, data_ends = [], []
+        md = self.pq.ParquetFile(io.BytesIO(footer)).metadata
+
+        # Convert columns to a set and add any index columns
+        # specified in the pandas metadata (just in case)
+        column_set = None if columns is None else set(columns)
+        if column_set is not None:
+            schema = md.schema.to_arrow_schema()
+            has_pandas_metadata = (
+                schema.metadata is not None and b"pandas" in schema.metadata
+            )
+            if has_pandas_metadata:
+                md_index = [
+                    ind
+                    for ind in json.loads(
+                        schema.metadata[b"pandas"].decode("utf8")
+                    ).get("index_columns", [])
+                    # Ignore RangeIndex information
+                    if not isinstance(ind, dict)
+                ]
+                column_set |= set(md_index)
+
+        # Loop through column chunks to add required byte ranges
+        for r in range(md.num_row_groups):
+            # Skip this row-group if we are targeting
+            # specific row-groups
+            if row_groups is None or r in row_groups:
+                row_group = md.row_group(r)
+                for c in range(row_group.num_columns):
+                    column = row_group.column(c)
+                    name = column.path_in_schema
+                    # Skip this column if we are targeting a
+                    # specific columns
+                    split_name = name.split(".")[0]
+                    if (
+                        column_set is None
+                        or name in column_set
+                        or split_name in column_set
+                    ):
+                        file_offset0 = column.dictionary_page_offset
+                        if file_offset0 is None:
+                            file_offset0 = column.data_page_offset
+                        num_bytes = column.total_compressed_size
+                        if file_offset0 < footer_start:
+                            data_starts.append(file_offset0)
+                            data_ends.append(
+                                min(file_offset0 + num_bytes, footer_start)
+                            )
+        return data_starts, data_ends

backend_service/venv/lib/python3.13/site-packages/fsspec/registry.py

@@ -0,0 +1,330 @@
+from __future__ import annotations
+
+import importlib
+import types
+import warnings
+
+__all__ = ["registry", "get_filesystem_class", "default"]
+
+# internal, mutable
+_registry: dict[str, type] = {}
+
+# external, immutable
+registry = types.MappingProxyType(_registry)
+default = "file"
+
+
+def register_implementation(name, cls, clobber=False, errtxt=None):
+    """Add implementation class to the registry
+
+    Parameters
+    ----------
+    name: str
+        Protocol name to associate with the class
+    cls: class or str
+        if a class: fsspec-compliant implementation class (normally inherits from
+        ``fsspec.AbstractFileSystem``, gets added straight to the registry. If a
+        str, the full path to an implementation class like package.module.class,
+        which gets added to known_implementations,
+        so the import is deferred until the filesystem is actually used.
+    clobber: bool (optional)
+        Whether to overwrite a protocol with the same name; if False, will raise
+        instead.
+    errtxt: str (optional)
+        If given, then a failure to import the given class will result in this
+        text being given.
+    """
+    if isinstance(cls, str):
+        if name in known_implementations and clobber is False:
+            if cls != known_implementations[name]["class"]:
+                raise ValueError(
+                    f"Name ({name}) already in the known_implementations and clobber "
+                    f"is False"
+                )
+        else:
+            known_implementations[name] = {
+                "class": cls,
+                "err": errtxt or f"{cls} import failed for protocol {name}",
+            }
+
+    else:
+        if name in registry and clobber is False:
+            if _registry[name] is not cls:
+                raise ValueError(
+                    f"Name ({name}) already in the registry and clobber is False"
+                )
+        else:
+            _registry[name] = cls
+
+
+# protocols mapped to the class which implements them. This dict can be
+# updated with register_implementation
+known_implementations = {
+    "abfs": {
+        "class": "adlfs.AzureBlobFileSystem",
+        "err": "Install adlfs to access Azure Datalake Gen2 and Azure Blob Storage",
+    },
+    "adl": {
+        "class": "adlfs.AzureDatalakeFileSystem",
+        "err": "Install adlfs to access Azure Datalake Gen1",
+    },
+    "arrow_hdfs": {
+        "class": "fsspec.implementations.arrow.HadoopFileSystem",
+        "err": "pyarrow and local java libraries required for HDFS",
+    },
+    "asynclocal": {
+        "class": "morefs.asyn_local.AsyncLocalFileSystem",
+        "err": "Install 'morefs[asynclocalfs]' to use AsyncLocalFileSystem",
+    },
+    "asyncwrapper": {
+        "class": "fsspec.implementations.asyn_wrapper.AsyncFileSystemWrapper",
+    },
+    "az": {
+        "class": "adlfs.AzureBlobFileSystem",
+        "err": "Install adlfs to access Azure Datalake Gen2 and Azure Blob Storage",
+    },
+    "blockcache": {"class": "fsspec.implementations.cached.CachingFileSystem"},
+    "box": {
+        "class": "boxfs.BoxFileSystem",
+        "err": "Please install boxfs to access BoxFileSystem",
+    },
+    "cached": {"class": "fsspec.implementations.cached.CachingFileSystem"},
+    "dask": {
+        "class": "fsspec.implementations.dask.DaskWorkerFileSystem",
+        "err": "Install dask distributed to access worker file system",
+    },
+    "data": {"class": "fsspec.implementations.data.DataFileSystem"},
+    "dbfs": {
+        "class": "fsspec.implementations.dbfs.DatabricksFileSystem",
+        "err": "Install the requests package to use the DatabricksFileSystem",
+    },
+    "dir": {"class": "fsspec.implementations.dirfs.DirFileSystem"},
+    "dropbox": {
+        "class": "dropboxdrivefs.DropboxDriveFileSystem",
+        "err": (
+            'DropboxFileSystem requires "dropboxdrivefs","requests" and "'
+            '"dropbox" to be installed'
+        ),
+    },
+    "dvc": {
+        "class": "dvc.api.DVCFileSystem",
+        "err": "Install dvc to access DVCFileSystem",
+    },
+    "file": {"class": "fsspec.implementations.local.LocalFileSystem"},
+    "filecache": {"class": "fsspec.implementations.cached.WholeFileCacheFileSystem"},
+    "ftp": {"class": "fsspec.implementations.ftp.FTPFileSystem"},
+    "gcs": {
+        "class": "gcsfs.GCSFileSystem",
+        "err": "Please install gcsfs to access Google Storage",
+    },
+    "gdrive": {
+        "class": "gdrive_fsspec.GoogleDriveFileSystem",
+        "err": "Please install gdrive_fs for access to Google Drive",
+    },
+    "generic": {"class": "fsspec.generic.GenericFileSystem"},
+    "gist": {
+        "class": "fsspec.implementations.gist.GistFileSystem",
+        "err": "Install the requests package to use the gist FS",
+    },
+    "git": {
+        "class": "fsspec.implementations.git.GitFileSystem",
+        "err": "Install pygit2 to browse local git repos",
+    },
+    "github": {
+        "class": "fsspec.implementations.github.GithubFileSystem",
+        "err": "Install the requests package to use the github FS",
+    },
+    "gs": {
+        "class": "gcsfs.GCSFileSystem",
+        "err": "Please install gcsfs to access Google Storage",
+    },
+    "hdfs": {
+        "class": "fsspec.implementations.arrow.HadoopFileSystem",
+        "err": "pyarrow and local java libraries required for HDFS",
+    },
+    "hf": {
+        "class": "huggingface_hub.HfFileSystem",
+        "err": "Install huggingface_hub to access HfFileSystem",
+    },
+    "http": {
+        "class": "fsspec.implementations.http.HTTPFileSystem",
+        "err": 'HTTPFileSystem requires "requests" and "aiohttp" to be installed',
+    },
+    "https": {
+        "class": "fsspec.implementations.http.HTTPFileSystem",
+        "err": 'HTTPFileSystem requires "requests" and "aiohttp" to be installed',
+    },
+    "jlab": {
+        "class": "fsspec.implementations.jupyter.JupyterFileSystem",
+        "err": "Jupyter FS requires requests to be installed",
+    },
+    "jupyter": {
+        "class": "fsspec.implementations.jupyter.JupyterFileSystem",
+        "err": "Jupyter FS requires requests to be installed",
+    },
+    "lakefs": {
+        "class": "lakefs_spec.LakeFSFileSystem",
+        "err": "Please install lakefs-spec to access LakeFSFileSystem",
+    },
+    "libarchive": {
+        "class": "fsspec.implementations.libarchive.LibArchiveFileSystem",
+        "err": "LibArchive requires to be installed",
+    },
+    "local": {"class": "fsspec.implementations.local.LocalFileSystem"},
+    "memory": {"class": "fsspec.implementations.memory.MemoryFileSystem"},
+    "oci": {
+        "class": "ocifs.OCIFileSystem",
+        "err": "Install ocifs to access OCI Object Storage",
+    },
+    "ocilake": {
+        "class": "ocifs.OCIFileSystem",
+        "err": "Install ocifs to access OCI Data Lake",
+    },
+    "oss": {
+        "class": "ossfs.OSSFileSystem",
+        "err": "Install ossfs to access Alibaba Object Storage System",
+    },
+    "pyscript": {
+        "class": "pyscript_fsspec_client.client.PyscriptFileSystem",
+        "err": "Install requests (cpython) or run in pyscript",
+    },
+    "reference": {"class": "fsspec.implementations.reference.ReferenceFileSystem"},
+    "root": {
+        "class": "fsspec_xrootd.XRootDFileSystem",
+        "err": (
+            "Install fsspec-xrootd to access xrootd storage system. "
+            "Note: 'root' is the protocol name for xrootd storage systems, "
+            "not referring to root directories"
+        ),
+    },
+    "s3": {"class": "s3fs.S3FileSystem", "err": "Install s3fs to access S3"},
+    "s3a": {"class": "s3fs.S3FileSystem", "err": "Install s3fs to access S3"},
+    "sftp": {
+        "class": "fsspec.implementations.sftp.SFTPFileSystem",
+        "err": 'SFTPFileSystem requires "paramiko" to be installed',
+    },
+    "simplecache": {"class": "fsspec.implementations.cached.SimpleCacheFileSystem"},
+    "smb": {
+        "class": "fsspec.implementations.smb.SMBFileSystem",
+        "err": 'SMB requires "smbprotocol" or "smbprotocol[kerberos]" installed',
+    },
+    "ssh": {
+        "class": "fsspec.implementations.sftp.SFTPFileSystem",
+        "err": 'SFTPFileSystem requires "paramiko" to be installed',
+    },
+    "tar": {"class": "fsspec.implementations.tar.TarFileSystem"},
+    "tos": {
+        "class": "tosfs.TosFileSystem",
+        "err": "Install tosfs to access ByteDance volcano engine Tinder Object Storage",
+    },
+    "tosfs": {
+        "class": "tosfs.TosFileSystem",
+        "err": "Install tosfs to access ByteDance volcano engine Tinder Object Storage",
+    },
+    "wandb": {"class": "wandbfs.WandbFS", "err": "Install wandbfs to access wandb"},
+    "webdav": {
+        "class": "webdav4.fsspec.WebdavFileSystem",
+        "err": "Install webdav4 to access WebDAV",
+    },
+    "webhdfs": {
+        "class": "fsspec.implementations.webhdfs.WebHDFS",
+        "err": 'webHDFS access requires "requests" to be installed',
+    },
+    "zip": {"class": "fsspec.implementations.zip.ZipFileSystem"},
+}
+
+assert list(known_implementations) == sorted(known_implementations), (
+    "Not in alphabetical order"
+)
+
+
+def get_filesystem_class(protocol):
+    """Fetch named protocol implementation from the registry
+
+    The dict ``known_implementations`` maps protocol names to the locations
+    of classes implementing the corresponding file-system. When used for the
+    first time, appropriate imports will happen and the class will be placed in
+    the registry. All subsequent calls will fetch directly from the registry.
+
+    Some protocol implementations require additional dependencies, and so the
+    import may fail. In this case, the string in the "err" field of the
+    ``known_implementations`` will be given as the error message.
+    """
+    if not protocol:
+        protocol = default
+
+    if protocol not in registry:
+        if protocol not in known_implementations:
+            raise ValueError(f"Protocol not known: {protocol}")
+        bit = known_implementations[protocol]
+        try:
+            register_implementation(protocol, _import_class(bit["class"]))
+        except ImportError as e:
+            raise ImportError(bit.get("err")) from e
+    cls = registry[protocol]
+    if getattr(cls, "protocol", None) in ("abstract", None):
+        cls.protocol = protocol
+
+    return cls
+
+
+s3_msg = """Your installed version of s3fs is very old and known to cause
+severe performance issues, see also https://github.com/dask/dask/issues/10276
+
+To fix, you should specify a lower version bound on s3fs, or
+update the current installation.
+"""
+
+
+def _import_class(fqp: str):
+    """Take a fully-qualified path and return the imported class or identifier.
+
+    ``fqp`` is of the form "package.module.klass" or
+    "package.module:subobject.klass".
+
+    Warnings
+    --------
+    This can import arbitrary modules. Make sure you haven't installed any modules
+    that may execute malicious code at import time.
+    """
+    if ":" in fqp:
+        mod, name = fqp.rsplit(":", 1)
+    else:
+        mod, name = fqp.rsplit(".", 1)
+
+    is_s3 = mod == "s3fs"
+    mod = importlib.import_module(mod)
+    if is_s3 and mod.__version__.split(".") < ["0", "5"]:
+        warnings.warn(s3_msg)
+    for part in name.split("."):
+        mod = getattr(mod, part)
+
+    if not isinstance(mod, type):
+        raise TypeError(f"{fqp} is not a class")
+
+    return mod
+
+
+def filesystem(protocol, **storage_options):
+    """Instantiate filesystems for given protocol and arguments
+
+    ``storage_options`` are specific to the protocol being chosen, and are
+    passed directly to the class.
+    """
+    if protocol == "arrow_hdfs":
+        warnings.warn(
+            "The 'arrow_hdfs' protocol has been deprecated and will be "
+            "removed in the future. Specify it as 'hdfs'.",
+            DeprecationWarning,
+        )
+
+    cls = get_filesystem_class(protocol)
+    return cls(**storage_options)
+
+
+def available_protocols():
+    """Return a list of the implemented protocols.
+
+    Note that any given protocol may require extra packages to be importable.
+    """
+    return list(known_implementations)

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/__init__.py

@@ -0,0 +1,289 @@
+import os
+from hashlib import md5
+
+import pytest
+
+from fsspec.implementations.local import LocalFileSystem
+from fsspec.tests.abstract.copy import AbstractCopyTests  # noqa: F401
+from fsspec.tests.abstract.get import AbstractGetTests  # noqa: F401
+from fsspec.tests.abstract.open import AbstractOpenTests  # noqa: F401
+from fsspec.tests.abstract.pipe import AbstractPipeTests  # noqa: F401
+from fsspec.tests.abstract.put import AbstractPutTests  # noqa: F401
+
+
+class BaseAbstractFixtures:
+    """
+    Abstract base class containing fixtures that are used by but never need to
+    be overridden in derived filesystem-specific classes to run the abstract
+    tests on such filesystems.
+    """
+
+    @pytest.fixture
+    def fs_bulk_operations_scenario_0(self, fs, fs_join, fs_path):
+        """
+        Scenario on remote filesystem that is used for many cp/get/put tests.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._bulk_operations_scenario_0(fs, fs_join, fs_path)
+        yield source
+        fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def fs_glob_edge_cases_files(self, fs, fs_join, fs_path):
+        """
+        Scenario on remote filesystem that is used for glob edge cases cp/get/put tests.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._glob_edge_cases_files(fs, fs_join, fs_path)
+        yield source
+        fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def fs_dir_and_file_with_same_name_prefix(self, fs, fs_join, fs_path):
+        """
+        Scenario on remote filesystem that is used to check cp/get/put on directory
+        and file with the same name prefixes.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._dir_and_file_with_same_name_prefix(fs, fs_join, fs_path)
+        yield source
+        fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def fs_10_files_with_hashed_names(self, fs, fs_join, fs_path):
+        """
+        Scenario on remote filesystem that is used to check cp/get/put files order
+        when source and destination are lists.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._10_files_with_hashed_names(fs, fs_join, fs_path)
+        yield source
+        fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def fs_target(self, fs, fs_join, fs_path):
+        """
+        Return name of remote directory that does not yet exist to copy into.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        target = fs_join(fs_path, "target")
+        yield target
+        if fs.exists(target):
+            fs.rm(target, recursive=True)
+
+    @pytest.fixture
+    def local_bulk_operations_scenario_0(self, local_fs, local_join, local_path):
+        """
+        Scenario on local filesystem that is used for many cp/get/put tests.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._bulk_operations_scenario_0(local_fs, local_join, local_path)
+        yield source
+        local_fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def local_glob_edge_cases_files(self, local_fs, local_join, local_path):
+        """
+        Scenario on local filesystem that is used for glob edge cases cp/get/put tests.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._glob_edge_cases_files(local_fs, local_join, local_path)
+        yield source
+        local_fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def local_dir_and_file_with_same_name_prefix(
+        self, local_fs, local_join, local_path
+    ):
+        """
+        Scenario on local filesystem that is used to check cp/get/put on directory
+        and file with the same name prefixes.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._dir_and_file_with_same_name_prefix(
+            local_fs, local_join, local_path
+        )
+        yield source
+        local_fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def local_10_files_with_hashed_names(self, local_fs, local_join, local_path):
+        """
+        Scenario on local filesystem that is used to check cp/get/put files order
+        when source and destination are lists.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        source = self._10_files_with_hashed_names(local_fs, local_join, local_path)
+        yield source
+        local_fs.rm(source, recursive=True)
+
+    @pytest.fixture
+    def local_target(self, local_fs, local_join, local_path):
+        """
+        Return name of local directory that does not yet exist to copy into.
+
+        Cleans up at the end of each test it which it is used.
+        """
+        target = local_join(local_path, "target")
+        yield target
+        if local_fs.exists(target):
+            local_fs.rm(target, recursive=True)
+
+    def _glob_edge_cases_files(self, some_fs, some_join, some_path):
+        """
+        Scenario that is used for glob edge cases cp/get/put tests.
+        Creates the following directory and file structure:
+
+        📁 source
+        ├── 📄 file1
+        ├── 📄 file2
+        ├── 📁 subdir0
+        │   ├── 📄 subfile1
+        │   ├── 📄 subfile2
+        │   └── 📁 nesteddir
+        │       └── 📄 nestedfile
+        └── 📁 subdir1
+            ├── 📄 subfile1
+            ├── 📄 subfile2
+            └── 📁 nesteddir
+                └── 📄 nestedfile
+        """
+        source = some_join(some_path, "source")
+        some_fs.touch(some_join(source, "file1"))
+        some_fs.touch(some_join(source, "file2"))
+
+        for subdir_idx in range(2):
+            subdir = some_join(source, f"subdir{subdir_idx}")
+            nesteddir = some_join(subdir, "nesteddir")
+            some_fs.makedirs(nesteddir)
+            some_fs.touch(some_join(subdir, "subfile1"))
+            some_fs.touch(some_join(subdir, "subfile2"))
+            some_fs.touch(some_join(nesteddir, "nestedfile"))
+
+        return source
+
+    def _bulk_operations_scenario_0(self, some_fs, some_join, some_path):
+        """
+        Scenario that is used for many cp/get/put tests. Creates the following
+        directory and file structure:
+
+        📁 source
+        ├── 📄 file1
+        ├── 📄 file2
+        └── 📁 subdir
+            ├── 📄 subfile1
+            ├── 📄 subfile2
+            └── 📁 nesteddir
+                └── 📄 nestedfile
+        """
+        source = some_join(some_path, "source")
+        subdir = some_join(source, "subdir")
+        nesteddir = some_join(subdir, "nesteddir")
+        some_fs.makedirs(nesteddir)
+        some_fs.touch(some_join(source, "file1"))
+        some_fs.touch(some_join(source, "file2"))
+        some_fs.touch(some_join(subdir, "subfile1"))
+        some_fs.touch(some_join(subdir, "subfile2"))
+        some_fs.touch(some_join(nesteddir, "nestedfile"))
+        return source
+
+    def _dir_and_file_with_same_name_prefix(self, some_fs, some_join, some_path):
+        """
+        Scenario that is used to check cp/get/put on directory and file with
+        the same name prefixes. Creates the following directory and file structure:
+
+        📁 source
+        ├── 📄 subdir.txt
+        └── 📁 subdir
+            └── 📄 subfile.txt
+        """
+        source = some_join(some_path, "source")
+        subdir = some_join(source, "subdir")
+        file = some_join(source, "subdir.txt")
+        subfile = some_join(subdir, "subfile.txt")
+        some_fs.makedirs(subdir)
+        some_fs.touch(file)
+        some_fs.touch(subfile)
+        return source
+
+    def _10_files_with_hashed_names(self, some_fs, some_join, some_path):
+        """
+        Scenario that is used to check cp/get/put files order when source and
+        destination are lists. Creates the following directory and file structure:
+
+        📁 source
+        └── 📄 {hashed([0-9])}.txt
+        """
+        source = some_join(some_path, "source")
+        for i in range(10):
+            hashed_i = md5(str(i).encode("utf-8")).hexdigest()
+            path = some_join(source, f"{hashed_i}.txt")
+            some_fs.pipe(path=path, value=f"{i}".encode())
+        return source
+
+
+class AbstractFixtures(BaseAbstractFixtures):
+    """
+    Abstract base class containing fixtures that may be overridden in derived
+    filesystem-specific classes to run the abstract tests on such filesystems.
+
+    For any particular filesystem some of these fixtures must be overridden,
+    such as ``fs`` and ``fs_path``, and others may be overridden if the
+    default functions here are not appropriate, such as ``fs_join``.
+    """
+
+    @pytest.fixture
+    def fs(self):
+        raise NotImplementedError("This function must be overridden in derived classes")
+
+    @pytest.fixture
+    def fs_join(self):
+        """
+        Return a function that joins its arguments together into a path.
+
+        Most fsspec implementations join paths in a platform-dependent way,
+        but some will override this to always use a forward slash.
+        """
+        return os.path.join
+
+    @pytest.fixture
+    def fs_path(self):
+        raise NotImplementedError("This function must be overridden in derived classes")
+
+    @pytest.fixture(scope="class")
+    def local_fs(self):
+        # Maybe need an option for auto_mkdir=False?  This is only relevant
+        # for certain implementations.
+        return LocalFileSystem(auto_mkdir=True)
+
+    @pytest.fixture
+    def local_join(self):
+        """
+        Return a function that joins its arguments together into a path, on
+        the local filesystem.
+        """
+        return os.path.join
+
+    @pytest.fixture
+    def local_path(self, tmpdir):
+        return tmpdir
+
+    @pytest.fixture
+    def supports_empty_directories(self):
+        """
+        Return whether this implementation supports empty directories.
+        """
+        return True
+
+    @pytest.fixture
+    def fs_sanitize_path(self):
+        return lambda x: x

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/common.py

@@ -0,0 +1,175 @@
+GLOB_EDGE_CASES_TESTS = {
+    "argnames": ("path", "recursive", "maxdepth", "expected"),
+    "argvalues": [
+        ("fil?1", False, None, ["file1"]),
+        ("fil?1", True, None, ["file1"]),
+        ("file[1-2]", False, None, ["file1", "file2"]),
+        ("file[1-2]", True, None, ["file1", "file2"]),
+        ("*", False, None, ["file1", "file2"]),
+        (
+            "*",
+            True,
+            None,
+            [
+                "file1",
+                "file2",
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir0/nesteddir/nestedfile",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+                "subdir1/nesteddir/nestedfile",
+            ],
+        ),
+        ("*", True, 1, ["file1", "file2"]),
+        (
+            "*",
+            True,
+            2,
+            [
+                "file1",
+                "file2",
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+            ],
+        ),
+        ("*1", False, None, ["file1"]),
+        (
+            "*1",
+            True,
+            None,
+            [
+                "file1",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+                "subdir1/nesteddir/nestedfile",
+            ],
+        ),
+        ("*1", True, 2, ["file1", "subdir1/subfile1", "subdir1/subfile2"]),
+        (
+            "**",
+            False,
+            None,
+            [
+                "file1",
+                "file2",
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir0/nesteddir/nestedfile",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+                "subdir1/nesteddir/nestedfile",
+            ],
+        ),
+        (
+            "**",
+            True,
+            None,
+            [
+                "file1",
+                "file2",
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir0/nesteddir/nestedfile",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+                "subdir1/nesteddir/nestedfile",
+            ],
+        ),
+        ("**", True, 1, ["file1", "file2"]),
+        (
+            "**",
+            True,
+            2,
+            [
+                "file1",
+                "file2",
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir0/nesteddir/nestedfile",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+                "subdir1/nesteddir/nestedfile",
+            ],
+        ),
+        (
+            "**",
+            False,
+            2,
+            [
+                "file1",
+                "file2",
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+            ],
+        ),
+        ("**/*1", False, None, ["file1", "subdir0/subfile1", "subdir1/subfile1"]),
+        (
+            "**/*1",
+            True,
+            None,
+            [
+                "file1",
+                "subdir0/subfile1",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+                "subdir1/nesteddir/nestedfile",
+            ],
+        ),
+        ("**/*1", True, 1, ["file1"]),
+        (
+            "**/*1",
+            True,
+            2,
+            ["file1", "subdir0/subfile1", "subdir1/subfile1", "subdir1/subfile2"],
+        ),
+        ("**/*1", False, 2, ["file1", "subdir0/subfile1", "subdir1/subfile1"]),
+        ("**/subdir0", False, None, []),
+        ("**/subdir0", True, None, ["subfile1", "subfile2", "nesteddir/nestedfile"]),
+        ("**/subdir0/nested*", False, 2, []),
+        ("**/subdir0/nested*", True, 2, ["nestedfile"]),
+        ("subdir[1-2]", False, None, []),
+        ("subdir[1-2]", True, None, ["subfile1", "subfile2", "nesteddir/nestedfile"]),
+        ("subdir[1-2]", True, 2, ["subfile1", "subfile2"]),
+        ("subdir[0-1]", False, None, []),
+        (
+            "subdir[0-1]",
+            True,
+            None,
+            [
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir0/nesteddir/nestedfile",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+                "subdir1/nesteddir/nestedfile",
+            ],
+        ),
+        (
+            "subdir[0-1]/*fil[e]*",
+            False,
+            None,
+            [
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+            ],
+        ),
+        (
+            "subdir[0-1]/*fil[e]*",
+            True,
+            None,
+            [
+                "subdir0/subfile1",
+                "subdir0/subfile2",
+                "subdir1/subfile1",
+                "subdir1/subfile2",
+            ],
+        ),
+    ],
+}

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/copy.py

@@ -0,0 +1,557 @@
+from hashlib import md5
+from itertools import product
+
+import pytest
+
+from fsspec.tests.abstract.common import GLOB_EDGE_CASES_TESTS
+
+
+class AbstractCopyTests:
+    def test_copy_file_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        fs_target,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1a
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            fs.touch(fs_join(target, "dummy"))
+        assert fs.isdir(target)
+
+        target_file2 = fs_join(target, "file2")
+        target_subfile1 = fs_join(target, "subfile1")
+
+        # Copy from source directory
+        fs.cp(fs_join(source, "file2"), target)
+        assert fs.isfile(target_file2)
+
+        # Copy from sub directory
+        fs.cp(fs_join(source, "subdir", "subfile1"), target)
+        assert fs.isfile(target_subfile1)
+
+        # Remove copied files
+        fs.rm([target_file2, target_subfile1])
+        assert not fs.exists(target_file2)
+        assert not fs.exists(target_subfile1)
+
+        # Repeat with trailing slash on target
+        fs.cp(fs_join(source, "file2"), target + "/")
+        assert fs.isdir(target)
+        assert fs.isfile(target_file2)
+
+        fs.cp(fs_join(source, "subdir", "subfile1"), target + "/")
+        assert fs.isfile(target_subfile1)
+
+    def test_copy_file_to_new_directory(
+        self, fs, fs_join, fs_bulk_operations_scenario_0, fs_target
+    ):
+        # Copy scenario 1b
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        fs.cp(
+            fs_join(source, "subdir", "subfile1"), fs_join(target, "newdir/")
+        )  # Note trailing slash
+        assert fs.isdir(target)
+        assert fs.isdir(fs_join(target, "newdir"))
+        assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+
+    def test_copy_file_to_file_in_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        fs_target,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1c
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            fs.touch(fs_join(target, "dummy"))
+        assert fs.isdir(target)
+
+        fs.cp(fs_join(source, "subdir", "subfile1"), fs_join(target, "newfile"))
+        assert fs.isfile(fs_join(target, "newfile"))
+
+    def test_copy_file_to_file_in_new_directory(
+        self, fs, fs_join, fs_bulk_operations_scenario_0, fs_target
+    ):
+        # Copy scenario 1d
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        fs.cp(
+            fs_join(source, "subdir", "subfile1"), fs_join(target, "newdir", "newfile")
+        )
+        assert fs.isdir(fs_join(target, "newdir"))
+        assert fs.isfile(fs_join(target, "newdir", "newfile"))
+
+    def test_copy_directory_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        fs_target,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1e
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            dummy = fs_join(target, "dummy")
+            fs.touch(dummy)
+        assert fs.isdir(target)
+
+        for source_slash, target_slash in zip([False, True], [False, True]):
+            s = fs_join(source, "subdir")
+            if source_slash:
+                s += "/"
+            t = target + "/" if target_slash else target
+
+            # Without recursive does nothing
+            fs.cp(s, t)
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+            # With recursive
+            fs.cp(s, t, recursive=True)
+            if source_slash:
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert fs.isdir(fs_join(target, "nesteddir"))
+                assert fs.isfile(fs_join(target, "nesteddir", "nestedfile"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                        fs_join(target, "nesteddir"),
+                    ],
+                    recursive=True,
+                )
+            else:
+                assert fs.isdir(fs_join(target, "subdir"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile2"))
+                assert fs.isdir(fs_join(target, "subdir", "nesteddir"))
+                assert fs.isfile(fs_join(target, "subdir", "nesteddir", "nestedfile"))
+
+                fs.rm(fs_join(target, "subdir"), recursive=True)
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+            # Limit recursive by maxdepth
+            fs.cp(s, t, recursive=True, maxdepth=1)
+            if source_slash:
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert not fs.exists(fs_join(target, "nesteddir"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                    ],
+                    recursive=True,
+                )
+            else:
+                assert fs.isdir(fs_join(target, "subdir"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile2"))
+                assert not fs.exists(fs_join(target, "subdir", "nesteddir"))
+
+                fs.rm(fs_join(target, "subdir"), recursive=True)
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+    def test_copy_directory_to_new_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        fs_target,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1f
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        for source_slash, target_slash in zip([False, True], [False, True]):
+            s = fs_join(source, "subdir")
+            if source_slash:
+                s += "/"
+            t = fs_join(target, "newdir")
+            if target_slash:
+                t += "/"
+
+            # Without recursive does nothing
+            fs.cp(s, t)
+            if supports_empty_directories:
+                assert fs.ls(target) == []
+            else:
+                with pytest.raises(FileNotFoundError):
+                    fs.ls(target)
+
+            # With recursive
+            fs.cp(s, t, recursive=True)
+            assert fs.isdir(fs_join(target, "newdir"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+            assert fs.isdir(fs_join(target, "newdir", "nesteddir"))
+            assert fs.isfile(fs_join(target, "newdir", "nesteddir", "nestedfile"))
+            assert not fs.exists(fs_join(target, "subdir"))
+
+            fs.rm(fs_join(target, "newdir"), recursive=True)
+            assert not fs.exists(fs_join(target, "newdir"))
+
+            # Limit recursive by maxdepth
+            fs.cp(s, t, recursive=True, maxdepth=1)
+            assert fs.isdir(fs_join(target, "newdir"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+            assert not fs.exists(fs_join(target, "newdir", "nesteddir"))
+            assert not fs.exists(fs_join(target, "subdir"))
+
+            fs.rm(fs_join(target, "newdir"), recursive=True)
+            assert not fs.exists(fs_join(target, "newdir"))
+
+    def test_copy_glob_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        fs_target,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1g
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            dummy = fs_join(target, "dummy")
+            fs.touch(dummy)
+        assert fs.isdir(target)
+
+        for target_slash in [False, True]:
+            t = target + "/" if target_slash else target
+
+            # Without recursive
+            fs.cp(fs_join(source, "subdir", "*"), t)
+            assert fs.isfile(fs_join(target, "subfile1"))
+            assert fs.isfile(fs_join(target, "subfile2"))
+            assert not fs.isdir(fs_join(target, "nesteddir"))
+            assert not fs.exists(fs_join(target, "nesteddir", "nestedfile"))
+            assert not fs.exists(fs_join(target, "subdir"))
+
+            fs.rm(
+                [
+                    fs_join(target, "subfile1"),
+                    fs_join(target, "subfile2"),
+                ],
+                recursive=True,
+            )
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+            # With recursive
+            for glob, recursive in zip(["*", "**"], [True, False]):
+                fs.cp(fs_join(source, "subdir", glob), t, recursive=recursive)
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert fs.isdir(fs_join(target, "nesteddir"))
+                assert fs.isfile(fs_join(target, "nesteddir", "nestedfile"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                        fs_join(target, "nesteddir"),
+                    ],
+                    recursive=True,
+                )
+                assert fs.ls(target, detail=False) == (
+                    [] if supports_empty_directories else [dummy]
+                )
+
+                # Limit recursive by maxdepth
+                fs.cp(
+                    fs_join(source, "subdir", glob), t, recursive=recursive, maxdepth=1
+                )
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert not fs.exists(fs_join(target, "nesteddir"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                    ],
+                    recursive=True,
+                )
+                assert fs.ls(target, detail=False) == (
+                    [] if supports_empty_directories else [dummy]
+                )
+
+    def test_copy_glob_to_new_directory(
+        self, fs, fs_join, fs_bulk_operations_scenario_0, fs_target
+    ):
+        # Copy scenario 1h
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        for target_slash in [False, True]:
+            t = fs_join(target, "newdir")
+            if target_slash:
+                t += "/"
+
+            # Without recursive
+            fs.cp(fs_join(source, "subdir", "*"), t)
+            assert fs.isdir(fs_join(target, "newdir"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+            assert not fs.exists(fs_join(target, "newdir", "nesteddir"))
+            assert not fs.exists(fs_join(target, "newdir", "nesteddir", "nestedfile"))
+            assert not fs.exists(fs_join(target, "subdir"))
+            assert not fs.exists(fs_join(target, "newdir", "subdir"))
+
+            fs.rm(fs_join(target, "newdir"), recursive=True)
+            assert not fs.exists(fs_join(target, "newdir"))
+
+            # With recursive
+            for glob, recursive in zip(["*", "**"], [True, False]):
+                fs.cp(fs_join(source, "subdir", glob), t, recursive=recursive)
+                assert fs.isdir(fs_join(target, "newdir"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+                assert fs.isdir(fs_join(target, "newdir", "nesteddir"))
+                assert fs.isfile(fs_join(target, "newdir", "nesteddir", "nestedfile"))
+                assert not fs.exists(fs_join(target, "subdir"))
+                assert not fs.exists(fs_join(target, "newdir", "subdir"))
+
+                fs.rm(fs_join(target, "newdir"), recursive=True)
+                assert not fs.exists(fs_join(target, "newdir"))
+
+                # Limit recursive by maxdepth
+                fs.cp(
+                    fs_join(source, "subdir", glob), t, recursive=recursive, maxdepth=1
+                )
+                assert fs.isdir(fs_join(target, "newdir"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+                assert not fs.exists(fs_join(target, "newdir", "nesteddir"))
+                assert not fs.exists(fs_join(target, "subdir"))
+                assert not fs.exists(fs_join(target, "newdir", "subdir"))
+
+                fs.rm(fs_join(target, "newdir"), recursive=True)
+                assert not fs.exists(fs_join(target, "newdir"))
+
+    @pytest.mark.parametrize(
+        GLOB_EDGE_CASES_TESTS["argnames"],
+        GLOB_EDGE_CASES_TESTS["argvalues"],
+    )
+    def test_copy_glob_edge_cases(
+        self,
+        path,
+        recursive,
+        maxdepth,
+        expected,
+        fs,
+        fs_join,
+        fs_glob_edge_cases_files,
+        fs_target,
+        fs_sanitize_path,
+    ):
+        # Copy scenario 1g
+        source = fs_glob_edge_cases_files
+
+        target = fs_target
+
+        for new_dir, target_slash in product([True, False], [True, False]):
+            fs.mkdir(target)
+
+            t = fs_join(target, "newdir") if new_dir else target
+            t = t + "/" if target_slash else t
+
+            fs.copy(fs_join(source, path), t, recursive=recursive, maxdepth=maxdepth)
+
+            output = fs.find(target)
+            if new_dir:
+                prefixed_expected = [
+                    fs_sanitize_path(fs_join(target, "newdir", p)) for p in expected
+                ]
+            else:
+                prefixed_expected = [
+                    fs_sanitize_path(fs_join(target, p)) for p in expected
+                ]
+            assert sorted(output) == sorted(prefixed_expected)
+
+            try:
+                fs.rm(target, recursive=True)
+            except FileNotFoundError:
+                pass
+
+    def test_copy_list_of_files_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        fs_target,
+        supports_empty_directories,
+    ):
+        # Copy scenario 2a
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            dummy = fs_join(target, "dummy")
+            fs.touch(dummy)
+        assert fs.isdir(target)
+
+        source_files = [
+            fs_join(source, "file1"),
+            fs_join(source, "file2"),
+            fs_join(source, "subdir", "subfile1"),
+        ]
+
+        for target_slash in [False, True]:
+            t = target + "/" if target_slash else target
+
+            fs.cp(source_files, t)
+            assert fs.isfile(fs_join(target, "file1"))
+            assert fs.isfile(fs_join(target, "file2"))
+            assert fs.isfile(fs_join(target, "subfile1"))
+
+            fs.rm(
+                [
+                    fs_join(target, "file1"),
+                    fs_join(target, "file2"),
+                    fs_join(target, "subfile1"),
+                ],
+                recursive=True,
+            )
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+    def test_copy_list_of_files_to_new_directory(
+        self, fs, fs_join, fs_bulk_operations_scenario_0, fs_target
+    ):
+        # Copy scenario 2b
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        source_files = [
+            fs_join(source, "file1"),
+            fs_join(source, "file2"),
+            fs_join(source, "subdir", "subfile1"),
+        ]
+
+        fs.cp(source_files, fs_join(target, "newdir") + "/")  # Note trailing slash
+        assert fs.isdir(fs_join(target, "newdir"))
+        assert fs.isfile(fs_join(target, "newdir", "file1"))
+        assert fs.isfile(fs_join(target, "newdir", "file2"))
+        assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+
+    def test_copy_two_files_new_directory(
+        self, fs, fs_join, fs_bulk_operations_scenario_0, fs_target
+    ):
+        # This is a duplicate of test_copy_list_of_files_to_new_directory and
+        # can eventually be removed.
+        source = fs_bulk_operations_scenario_0
+
+        target = fs_target
+        assert not fs.exists(target)
+        fs.cp([fs_join(source, "file1"), fs_join(source, "file2")], target)
+
+        assert fs.isdir(target)
+        assert fs.isfile(fs_join(target, "file1"))
+        assert fs.isfile(fs_join(target, "file2"))
+
+    def test_copy_directory_without_files_with_same_name_prefix(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        fs_dir_and_file_with_same_name_prefix,
+        supports_empty_directories,
+    ):
+        # Create the test dirs
+        source = fs_dir_and_file_with_same_name_prefix
+        target = fs_target
+
+        # Test without glob
+        fs.cp(fs_join(source, "subdir"), target, recursive=True)
+
+        assert fs.isfile(fs_join(target, "subfile.txt"))
+        assert not fs.isfile(fs_join(target, "subdir.txt"))
+
+        fs.rm([fs_join(target, "subfile.txt")])
+        if supports_empty_directories:
+            assert fs.ls(target) == []
+        else:
+            assert not fs.exists(target)
+
+        # Test with glob
+        fs.cp(fs_join(source, "subdir*"), target, recursive=True)
+
+        assert fs.isdir(fs_join(target, "subdir"))
+        assert fs.isfile(fs_join(target, "subdir", "subfile.txt"))
+        assert fs.isfile(fs_join(target, "subdir.txt"))
+
+    def test_copy_with_source_and_destination_as_list(
+        self, fs, fs_target, fs_join, fs_10_files_with_hashed_names
+    ):
+        # Create the test dir
+        source = fs_10_files_with_hashed_names
+        target = fs_target
+
+        # Create list of files for source and destination
+        source_files = []
+        destination_files = []
+        for i in range(10):
+            hashed_i = md5(str(i).encode("utf-8")).hexdigest()
+            source_files.append(fs_join(source, f"{hashed_i}.txt"))
+            destination_files.append(fs_join(target, f"{hashed_i}.txt"))
+
+        # Copy and assert order was kept
+        fs.copy(path1=source_files, path2=destination_files)
+
+        for i in range(10):
+            file_content = fs.cat(destination_files[i]).decode("utf-8")
+            assert file_content == str(i)

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/get.py

@@ -0,0 +1,587 @@
+from hashlib import md5
+from itertools import product
+
+import pytest
+
+from fsspec.implementations.local import make_path_posix
+from fsspec.tests.abstract.common import GLOB_EDGE_CASES_TESTS
+
+
+class AbstractGetTests:
+    def test_get_file_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1a
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+        assert local_fs.isdir(target)
+
+        target_file2 = local_join(target, "file2")
+        target_subfile1 = local_join(target, "subfile1")
+
+        # Copy from source directory
+        fs.get(fs_join(source, "file2"), target)
+        assert local_fs.isfile(target_file2)
+
+        # Copy from sub directory
+        fs.get(fs_join(source, "subdir", "subfile1"), target)
+        assert local_fs.isfile(target_subfile1)
+
+        # Remove copied files
+        local_fs.rm([target_file2, target_subfile1])
+        assert not local_fs.exists(target_file2)
+        assert not local_fs.exists(target_subfile1)
+
+        # Repeat with trailing slash on target
+        fs.get(fs_join(source, "file2"), target + "/")
+        assert local_fs.isdir(target)
+        assert local_fs.isfile(target_file2)
+
+        fs.get(fs_join(source, "subdir", "subfile1"), target + "/")
+        assert local_fs.isfile(target_subfile1)
+
+    def test_get_file_to_new_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1b
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        fs.get(
+            fs_join(source, "subdir", "subfile1"), local_join(target, "newdir/")
+        )  # Note trailing slash
+
+        assert local_fs.isdir(target)
+        assert local_fs.isdir(local_join(target, "newdir"))
+        assert local_fs.isfile(local_join(target, "newdir", "subfile1"))
+
+    def test_get_file_to_file_in_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1c
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        fs.get(fs_join(source, "subdir", "subfile1"), local_join(target, "newfile"))
+        assert local_fs.isfile(local_join(target, "newfile"))
+
+    def test_get_file_to_file_in_new_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1d
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        fs.get(
+            fs_join(source, "subdir", "subfile1"),
+            local_join(target, "newdir", "newfile"),
+        )
+        assert local_fs.isdir(local_join(target, "newdir"))
+        assert local_fs.isfile(local_join(target, "newdir", "newfile"))
+
+    def test_get_directory_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1e
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+        assert local_fs.isdir(target)
+
+        for source_slash, target_slash in zip([False, True], [False, True]):
+            s = fs_join(source, "subdir")
+            if source_slash:
+                s += "/"
+            t = target + "/" if target_slash else target
+
+            # Without recursive does nothing
+            fs.get(s, t)
+            assert local_fs.ls(target) == []
+
+            # With recursive
+            fs.get(s, t, recursive=True)
+            if source_slash:
+                assert local_fs.isfile(local_join(target, "subfile1"))
+                assert local_fs.isfile(local_join(target, "subfile2"))
+                assert local_fs.isdir(local_join(target, "nesteddir"))
+                assert local_fs.isfile(local_join(target, "nesteddir", "nestedfile"))
+                assert not local_fs.exists(local_join(target, "subdir"))
+
+                local_fs.rm(
+                    [
+                        local_join(target, "subfile1"),
+                        local_join(target, "subfile2"),
+                        local_join(target, "nesteddir"),
+                    ],
+                    recursive=True,
+                )
+            else:
+                assert local_fs.isdir(local_join(target, "subdir"))
+                assert local_fs.isfile(local_join(target, "subdir", "subfile1"))
+                assert local_fs.isfile(local_join(target, "subdir", "subfile2"))
+                assert local_fs.isdir(local_join(target, "subdir", "nesteddir"))
+                assert local_fs.isfile(
+                    local_join(target, "subdir", "nesteddir", "nestedfile")
+                )
+
+                local_fs.rm(local_join(target, "subdir"), recursive=True)
+            assert local_fs.ls(target) == []
+
+            # Limit recursive by maxdepth
+            fs.get(s, t, recursive=True, maxdepth=1)
+            if source_slash:
+                assert local_fs.isfile(local_join(target, "subfile1"))
+                assert local_fs.isfile(local_join(target, "subfile2"))
+                assert not local_fs.exists(local_join(target, "nesteddir"))
+                assert not local_fs.exists(local_join(target, "subdir"))
+
+                local_fs.rm(
+                    [
+                        local_join(target, "subfile1"),
+                        local_join(target, "subfile2"),
+                    ],
+                    recursive=True,
+                )
+            else:
+                assert local_fs.isdir(local_join(target, "subdir"))
+                assert local_fs.isfile(local_join(target, "subdir", "subfile1"))
+                assert local_fs.isfile(local_join(target, "subdir", "subfile2"))
+                assert not local_fs.exists(local_join(target, "subdir", "nesteddir"))
+
+                local_fs.rm(local_join(target, "subdir"), recursive=True)
+            assert local_fs.ls(target) == []
+
+    def test_get_directory_to_new_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1f
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        for source_slash, target_slash in zip([False, True], [False, True]):
+            s = fs_join(source, "subdir")
+            if source_slash:
+                s += "/"
+            t = local_join(target, "newdir")
+            if target_slash:
+                t += "/"
+
+            # Without recursive does nothing
+            fs.get(s, t)
+            assert local_fs.ls(target) == []
+
+            # With recursive
+            fs.get(s, t, recursive=True)
+            assert local_fs.isdir(local_join(target, "newdir"))
+            assert local_fs.isfile(local_join(target, "newdir", "subfile1"))
+            assert local_fs.isfile(local_join(target, "newdir", "subfile2"))
+            assert local_fs.isdir(local_join(target, "newdir", "nesteddir"))
+            assert local_fs.isfile(
+                local_join(target, "newdir", "nesteddir", "nestedfile")
+            )
+            assert not local_fs.exists(local_join(target, "subdir"))
+
+            local_fs.rm(local_join(target, "newdir"), recursive=True)
+            assert local_fs.ls(target) == []
+
+            # Limit recursive by maxdepth
+            fs.get(s, t, recursive=True, maxdepth=1)
+            assert local_fs.isdir(local_join(target, "newdir"))
+            assert local_fs.isfile(local_join(target, "newdir", "subfile1"))
+            assert local_fs.isfile(local_join(target, "newdir", "subfile2"))
+            assert not local_fs.exists(local_join(target, "newdir", "nesteddir"))
+            assert not local_fs.exists(local_join(target, "subdir"))
+
+            local_fs.rm(local_join(target, "newdir"), recursive=True)
+            assert not local_fs.exists(local_join(target, "newdir"))
+
+    def test_get_glob_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1g
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        for target_slash in [False, True]:
+            t = target + "/" if target_slash else target
+
+            # Without recursive
+            fs.get(fs_join(source, "subdir", "*"), t)
+            assert local_fs.isfile(local_join(target, "subfile1"))
+            assert local_fs.isfile(local_join(target, "subfile2"))
+            assert not local_fs.isdir(local_join(target, "nesteddir"))
+            assert not local_fs.exists(local_join(target, "nesteddir", "nestedfile"))
+            assert not local_fs.exists(local_join(target, "subdir"))
+
+            local_fs.rm(
+                [
+                    local_join(target, "subfile1"),
+                    local_join(target, "subfile2"),
+                ],
+                recursive=True,
+            )
+            assert local_fs.ls(target) == []
+
+            # With recursive
+            for glob, recursive in zip(["*", "**"], [True, False]):
+                fs.get(fs_join(source, "subdir", glob), t, recursive=recursive)
+                assert local_fs.isfile(local_join(target, "subfile1"))
+                assert local_fs.isfile(local_join(target, "subfile2"))
+                assert local_fs.isdir(local_join(target, "nesteddir"))
+                assert local_fs.isfile(local_join(target, "nesteddir", "nestedfile"))
+                assert not local_fs.exists(local_join(target, "subdir"))
+
+                local_fs.rm(
+                    [
+                        local_join(target, "subfile1"),
+                        local_join(target, "subfile2"),
+                        local_join(target, "nesteddir"),
+                    ],
+                    recursive=True,
+                )
+                assert local_fs.ls(target) == []
+
+                # Limit recursive by maxdepth
+                fs.get(
+                    fs_join(source, "subdir", glob), t, recursive=recursive, maxdepth=1
+                )
+                assert local_fs.isfile(local_join(target, "subfile1"))
+                assert local_fs.isfile(local_join(target, "subfile2"))
+                assert not local_fs.exists(local_join(target, "nesteddir"))
+                assert not local_fs.exists(local_join(target, "subdir"))
+
+                local_fs.rm(
+                    [
+                        local_join(target, "subfile1"),
+                        local_join(target, "subfile2"),
+                    ],
+                    recursive=True,
+                )
+                assert local_fs.ls(target) == []
+
+    def test_get_glob_to_new_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1h
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        for target_slash in [False, True]:
+            t = fs_join(target, "newdir")
+            if target_slash:
+                t += "/"
+
+            # Without recursive
+            fs.get(fs_join(source, "subdir", "*"), t)
+            assert local_fs.isdir(local_join(target, "newdir"))
+            assert local_fs.isfile(local_join(target, "newdir", "subfile1"))
+            assert local_fs.isfile(local_join(target, "newdir", "subfile2"))
+            assert not local_fs.exists(local_join(target, "newdir", "nesteddir"))
+            assert not local_fs.exists(
+                local_join(target, "newdir", "nesteddir", "nestedfile")
+            )
+            assert not local_fs.exists(local_join(target, "subdir"))
+            assert not local_fs.exists(local_join(target, "newdir", "subdir"))
+
+            local_fs.rm(local_join(target, "newdir"), recursive=True)
+            assert local_fs.ls(target) == []
+
+            # With recursive
+            for glob, recursive in zip(["*", "**"], [True, False]):
+                fs.get(fs_join(source, "subdir", glob), t, recursive=recursive)
+                assert local_fs.isdir(local_join(target, "newdir"))
+                assert local_fs.isfile(local_join(target, "newdir", "subfile1"))
+                assert local_fs.isfile(local_join(target, "newdir", "subfile2"))
+                assert local_fs.isdir(local_join(target, "newdir", "nesteddir"))
+                assert local_fs.isfile(
+                    local_join(target, "newdir", "nesteddir", "nestedfile")
+                )
+                assert not local_fs.exists(local_join(target, "subdir"))
+                assert not local_fs.exists(local_join(target, "newdir", "subdir"))
+
+                local_fs.rm(local_join(target, "newdir"), recursive=True)
+                assert not local_fs.exists(local_join(target, "newdir"))
+
+                # Limit recursive by maxdepth
+                fs.get(
+                    fs_join(source, "subdir", glob), t, recursive=recursive, maxdepth=1
+                )
+                assert local_fs.isdir(local_join(target, "newdir"))
+                assert local_fs.isfile(local_join(target, "newdir", "subfile1"))
+                assert local_fs.isfile(local_join(target, "newdir", "subfile2"))
+                assert not local_fs.exists(local_join(target, "newdir", "nesteddir"))
+                assert not local_fs.exists(local_join(target, "subdir"))
+                assert not local_fs.exists(local_join(target, "newdir", "subdir"))
+
+                local_fs.rm(local_fs.ls(target, detail=False), recursive=True)
+                assert not local_fs.exists(local_join(target, "newdir"))
+
+    @pytest.mark.parametrize(
+        GLOB_EDGE_CASES_TESTS["argnames"],
+        GLOB_EDGE_CASES_TESTS["argvalues"],
+    )
+    def test_get_glob_edge_cases(
+        self,
+        path,
+        recursive,
+        maxdepth,
+        expected,
+        fs,
+        fs_join,
+        fs_glob_edge_cases_files,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 1g
+        source = fs_glob_edge_cases_files
+
+        target = local_target
+
+        for new_dir, target_slash in product([True, False], [True, False]):
+            local_fs.mkdir(target)
+
+            t = local_join(target, "newdir") if new_dir else target
+            t = t + "/" if target_slash else t
+
+            fs.get(fs_join(source, path), t, recursive=recursive, maxdepth=maxdepth)
+
+            output = local_fs.find(target)
+            if new_dir:
+                prefixed_expected = [
+                    make_path_posix(local_join(target, "newdir", p)) for p in expected
+                ]
+            else:
+                prefixed_expected = [
+                    make_path_posix(local_join(target, p)) for p in expected
+                ]
+            assert sorted(output) == sorted(prefixed_expected)
+
+            try:
+                local_fs.rm(target, recursive=True)
+            except FileNotFoundError:
+                pass
+
+    def test_get_list_of_files_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 2a
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        source_files = [
+            fs_join(source, "file1"),
+            fs_join(source, "file2"),
+            fs_join(source, "subdir", "subfile1"),
+        ]
+
+        for target_slash in [False, True]:
+            t = target + "/" if target_slash else target
+
+            fs.get(source_files, t)
+            assert local_fs.isfile(local_join(target, "file1"))
+            assert local_fs.isfile(local_join(target, "file2"))
+            assert local_fs.isfile(local_join(target, "subfile1"))
+
+            local_fs.rm(
+                [
+                    local_join(target, "file1"),
+                    local_join(target, "file2"),
+                    local_join(target, "subfile1"),
+                ],
+                recursive=True,
+            )
+            assert local_fs.ls(target) == []
+
+    def test_get_list_of_files_to_new_directory(
+        self,
+        fs,
+        fs_join,
+        fs_bulk_operations_scenario_0,
+        local_fs,
+        local_join,
+        local_target,
+    ):
+        # Copy scenario 2b
+        source = fs_bulk_operations_scenario_0
+
+        target = local_target
+        local_fs.mkdir(target)
+
+        source_files = [
+            fs_join(source, "file1"),
+            fs_join(source, "file2"),
+            fs_join(source, "subdir", "subfile1"),
+        ]
+
+        fs.get(source_files, local_join(target, "newdir") + "/")  # Note trailing slash
+        assert local_fs.isdir(local_join(target, "newdir"))
+        assert local_fs.isfile(local_join(target, "newdir", "file1"))
+        assert local_fs.isfile(local_join(target, "newdir", "file2"))
+        assert local_fs.isfile(local_join(target, "newdir", "subfile1"))
+
+    def test_get_directory_recursive(
+        self, fs, fs_join, fs_path, local_fs, local_join, local_target
+    ):
+        # https://github.com/fsspec/filesystem_spec/issues/1062
+        # Recursive cp/get/put of source directory into non-existent target directory.
+        src = fs_join(fs_path, "src")
+        src_file = fs_join(src, "file")
+        fs.mkdir(src)
+        fs.touch(src_file)
+
+        target = local_target
+
+        # get without slash
+        assert not local_fs.exists(target)
+        for loop in range(2):
+            fs.get(src, target, recursive=True)
+            assert local_fs.isdir(target)
+
+            if loop == 0:
+                assert local_fs.isfile(local_join(target, "file"))
+                assert not local_fs.exists(local_join(target, "src"))
+            else:
+                assert local_fs.isfile(local_join(target, "file"))
+                assert local_fs.isdir(local_join(target, "src"))
+                assert local_fs.isfile(local_join(target, "src", "file"))
+
+        local_fs.rm(target, recursive=True)
+
+        # get with slash
+        assert not local_fs.exists(target)
+        for loop in range(2):
+            fs.get(src + "/", target, recursive=True)
+            assert local_fs.isdir(target)
+            assert local_fs.isfile(local_join(target, "file"))
+            assert not local_fs.exists(local_join(target, "src"))
+
+    def test_get_directory_without_files_with_same_name_prefix(
+        self,
+        fs,
+        fs_join,
+        local_fs,
+        local_join,
+        local_target,
+        fs_dir_and_file_with_same_name_prefix,
+    ):
+        # Create the test dirs
+        source = fs_dir_and_file_with_same_name_prefix
+        target = local_target
+
+        # Test without glob
+        fs.get(fs_join(source, "subdir"), target, recursive=True)
+
+        assert local_fs.isfile(local_join(target, "subfile.txt"))
+        assert not local_fs.isfile(local_join(target, "subdir.txt"))
+
+        local_fs.rm([local_join(target, "subfile.txt")])
+        assert local_fs.ls(target) == []
+
+        # Test with glob
+        fs.get(fs_join(source, "subdir*"), target, recursive=True)
+
+        assert local_fs.isdir(local_join(target, "subdir"))
+        assert local_fs.isfile(local_join(target, "subdir", "subfile.txt"))
+        assert local_fs.isfile(local_join(target, "subdir.txt"))
+
+    def test_get_with_source_and_destination_as_list(
+        self,
+        fs,
+        fs_join,
+        local_fs,
+        local_join,
+        local_target,
+        fs_10_files_with_hashed_names,
+    ):
+        # Create the test dir
+        source = fs_10_files_with_hashed_names
+        target = local_target
+
+        # Create list of files for source and destination
+        source_files = []
+        destination_files = []
+        for i in range(10):
+            hashed_i = md5(str(i).encode("utf-8")).hexdigest()
+            source_files.append(fs_join(source, f"{hashed_i}.txt"))
+            destination_files.append(
+                make_path_posix(local_join(target, f"{hashed_i}.txt"))
+            )
+
+        # Copy and assert order was kept
+        fs.get(rpath=source_files, lpath=destination_files)
+
+        for i in range(10):
+            file_content = local_fs.cat(destination_files[i]).decode("utf-8")
+            assert file_content == str(i)

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/mv.py

@@ -0,0 +1,57 @@
+import os
+
+import pytest
+
+import fsspec
+
+
+def test_move_raises_error_with_tmpdir(tmpdir):
+    # Create a file in the temporary directory
+    source = tmpdir.join("source_file.txt")
+    source.write("content")
+
+    # Define a destination that simulates a protected or invalid path
+    destination = tmpdir.join("non_existent_directory/destination_file.txt")
+
+    # Instantiate the filesystem (assuming the local file system interface)
+    fs = fsspec.filesystem("file")
+
+    # Use the actual file paths as string
+    with pytest.raises(FileNotFoundError):
+        fs.mv(str(source), str(destination))
+
+
+@pytest.mark.parametrize("recursive", (True, False))
+def test_move_raises_error_with_tmpdir_permission(recursive, tmpdir):
+    # Create a file in the temporary directory
+    source = tmpdir.join("source_file.txt")
+    source.write("content")
+
+    # Create a protected directory (non-writable)
+    protected_dir = tmpdir.mkdir("protected_directory")
+    protected_path = str(protected_dir)
+
+    # Set the directory to read-only
+    if os.name == "nt":
+        os.system(f'icacls "{protected_path}" /deny Everyone:(W)')
+    else:
+        os.chmod(protected_path, 0o555)  # Sets the directory to read-only
+
+    # Define a destination inside the protected directory
+    destination = protected_dir.join("destination_file.txt")
+
+    # Instantiate the filesystem (assuming the local file system interface)
+    fs = fsspec.filesystem("file")
+
+    # Try to move the file to the read-only directory, expecting a permission error
+    with pytest.raises(PermissionError):
+        fs.mv(str(source), str(destination), recursive=recursive)
+
+    # Assert the file was not created in the destination
+    assert not os.path.exists(destination)
+
+    # Cleanup: Restore permissions so the directory can be cleaned up
+    if os.name == "nt":
+        os.system(f'icacls "{protected_path}" /remove:d Everyone')
+    else:
+        os.chmod(protected_path, 0o755)  # Restore write permission for cleanup

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/open.py

@@ -0,0 +1,11 @@
+import pytest
+
+
+class AbstractOpenTests:
+    def test_open_exclusive(self, fs, fs_target):
+        with fs.open(fs_target, "wb") as f:
+            f.write(b"data")
+        with fs.open(fs_target, "rb") as f:
+            assert f.read() == b"data"
+        with pytest.raises(FileExistsError):
+            fs.open(fs_target, "xb")

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/pipe.py

@@ -0,0 +1,11 @@
+import pytest
+
+
+class AbstractPipeTests:
+    def test_pipe_exclusive(self, fs, fs_target):
+        fs.pipe_file(fs_target, b"data")
+        assert fs.cat_file(fs_target) == b"data"
+        with pytest.raises(FileExistsError):
+            fs.pipe_file(fs_target, b"data", mode="create")
+        fs.pipe_file(fs_target, b"new data", mode="overwrite")
+        assert fs.cat_file(fs_target) == b"new data"

backend_service/venv/lib/python3.13/site-packages/fsspec/tests/abstract/put.py

@@ -0,0 +1,591 @@
+from hashlib import md5
+from itertools import product
+
+import pytest
+
+from fsspec.tests.abstract.common import GLOB_EDGE_CASES_TESTS
+
+
+class AbstractPutTests:
+    def test_put_file_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        local_join,
+        local_bulk_operations_scenario_0,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1a
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            fs.touch(fs_join(target, "dummy"))
+        assert fs.isdir(target)
+
+        target_file2 = fs_join(target, "file2")
+        target_subfile1 = fs_join(target, "subfile1")
+
+        # Copy from source directory
+        fs.put(local_join(source, "file2"), target)
+        assert fs.isfile(target_file2)
+
+        # Copy from sub directory
+        fs.put(local_join(source, "subdir", "subfile1"), target)
+        assert fs.isfile(target_subfile1)
+
+        # Remove copied files
+        fs.rm([target_file2, target_subfile1])
+        assert not fs.exists(target_file2)
+        assert not fs.exists(target_subfile1)
+
+        # Repeat with trailing slash on target
+        fs.put(local_join(source, "file2"), target + "/")
+        assert fs.isdir(target)
+        assert fs.isfile(target_file2)
+
+        fs.put(local_join(source, "subdir", "subfile1"), target + "/")
+        assert fs.isfile(target_subfile1)
+
+    def test_put_file_to_new_directory(
+        self, fs, fs_join, fs_target, local_join, local_bulk_operations_scenario_0
+    ):
+        # Copy scenario 1b
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        fs.put(
+            local_join(source, "subdir", "subfile1"), fs_join(target, "newdir/")
+        )  # Note trailing slash
+        assert fs.isdir(target)
+        assert fs.isdir(fs_join(target, "newdir"))
+        assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+
+    def test_put_file_to_file_in_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        local_join,
+        supports_empty_directories,
+        local_bulk_operations_scenario_0,
+    ):
+        # Copy scenario 1c
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            fs.touch(fs_join(target, "dummy"))
+        assert fs.isdir(target)
+
+        fs.put(local_join(source, "subdir", "subfile1"), fs_join(target, "newfile"))
+        assert fs.isfile(fs_join(target, "newfile"))
+
+    def test_put_file_to_file_in_new_directory(
+        self, fs, fs_join, fs_target, local_join, local_bulk_operations_scenario_0
+    ):
+        # Copy scenario 1d
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        fs.put(
+            local_join(source, "subdir", "subfile1"),
+            fs_join(target, "newdir", "newfile"),
+        )
+        assert fs.isdir(fs_join(target, "newdir"))
+        assert fs.isfile(fs_join(target, "newdir", "newfile"))
+
+    def test_put_directory_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        local_bulk_operations_scenario_0,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1e
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            dummy = fs_join(target, "dummy")
+            fs.touch(dummy)
+        assert fs.isdir(target)
+
+        for source_slash, target_slash in zip([False, True], [False, True]):
+            s = fs_join(source, "subdir")
+            if source_slash:
+                s += "/"
+            t = target + "/" if target_slash else target
+
+            # Without recursive does nothing
+            fs.put(s, t)
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+            # With recursive
+            fs.put(s, t, recursive=True)
+            if source_slash:
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert fs.isdir(fs_join(target, "nesteddir"))
+                assert fs.isfile(fs_join(target, "nesteddir", "nestedfile"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                        fs_join(target, "nesteddir"),
+                    ],
+                    recursive=True,
+                )
+            else:
+                assert fs.isdir(fs_join(target, "subdir"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile2"))
+                assert fs.isdir(fs_join(target, "subdir", "nesteddir"))
+                assert fs.isfile(fs_join(target, "subdir", "nesteddir", "nestedfile"))
+
+                fs.rm(fs_join(target, "subdir"), recursive=True)
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+            # Limit recursive by maxdepth
+            fs.put(s, t, recursive=True, maxdepth=1)
+            if source_slash:
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert not fs.exists(fs_join(target, "nesteddir"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                    ],
+                    recursive=True,
+                )
+            else:
+                assert fs.isdir(fs_join(target, "subdir"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "subdir", "subfile2"))
+                assert not fs.exists(fs_join(target, "subdir", "nesteddir"))
+
+                fs.rm(fs_join(target, "subdir"), recursive=True)
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+    def test_put_directory_to_new_directory(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        local_bulk_operations_scenario_0,
+        supports_empty_directories,
+    ):
+        # Copy scenario 1f
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        for source_slash, target_slash in zip([False, True], [False, True]):
+            s = fs_join(source, "subdir")
+            if source_slash:
+                s += "/"
+            t = fs_join(target, "newdir")
+            if target_slash:
+                t += "/"
+
+            # Without recursive does nothing
+            fs.put(s, t)
+            if supports_empty_directories:
+                assert fs.ls(target) == []
+            else:
+                with pytest.raises(FileNotFoundError):
+                    fs.ls(target)
+
+            # With recursive
+            fs.put(s, t, recursive=True)
+            assert fs.isdir(fs_join(target, "newdir"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+            assert fs.isdir(fs_join(target, "newdir", "nesteddir"))
+            assert fs.isfile(fs_join(target, "newdir", "nesteddir", "nestedfile"))
+            assert not fs.exists(fs_join(target, "subdir"))
+
+            fs.rm(fs_join(target, "newdir"), recursive=True)
+            assert not fs.exists(fs_join(target, "newdir"))
+
+            # Limit recursive by maxdepth
+            fs.put(s, t, recursive=True, maxdepth=1)
+            assert fs.isdir(fs_join(target, "newdir"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+            assert not fs.exists(fs_join(target, "newdir", "nesteddir"))
+            assert not fs.exists(fs_join(target, "subdir"))
+
+            fs.rm(fs_join(target, "newdir"), recursive=True)
+            assert not fs.exists(fs_join(target, "newdir"))
+
+    def test_put_glob_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        local_join,
+        supports_empty_directories,
+        local_bulk_operations_scenario_0,
+    ):
+        # Copy scenario 1g
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            dummy = fs_join(target, "dummy")
+            fs.touch(dummy)
+        assert fs.isdir(target)
+
+        for target_slash in [False, True]:
+            t = target + "/" if target_slash else target
+
+            # Without recursive
+            fs.put(local_join(source, "subdir", "*"), t)
+            assert fs.isfile(fs_join(target, "subfile1"))
+            assert fs.isfile(fs_join(target, "subfile2"))
+            assert not fs.isdir(fs_join(target, "nesteddir"))
+            assert not fs.exists(fs_join(target, "nesteddir", "nestedfile"))
+            assert not fs.exists(fs_join(target, "subdir"))
+
+            fs.rm(
+                [
+                    fs_join(target, "subfile1"),
+                    fs_join(target, "subfile2"),
+                ],
+                recursive=True,
+            )
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+            # With recursive
+            for glob, recursive in zip(["*", "**"], [True, False]):
+                fs.put(local_join(source, "subdir", glob), t, recursive=recursive)
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert fs.isdir(fs_join(target, "nesteddir"))
+                assert fs.isfile(fs_join(target, "nesteddir", "nestedfile"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                        fs_join(target, "nesteddir"),
+                    ],
+                    recursive=True,
+                )
+                assert fs.ls(target, detail=False) == (
+                    [] if supports_empty_directories else [dummy]
+                )
+
+                # Limit recursive by maxdepth
+                fs.put(
+                    local_join(source, "subdir", glob),
+                    t,
+                    recursive=recursive,
+                    maxdepth=1,
+                )
+                assert fs.isfile(fs_join(target, "subfile1"))
+                assert fs.isfile(fs_join(target, "subfile2"))
+                assert not fs.exists(fs_join(target, "nesteddir"))
+                assert not fs.exists(fs_join(target, "subdir"))
+
+                fs.rm(
+                    [
+                        fs_join(target, "subfile1"),
+                        fs_join(target, "subfile2"),
+                    ],
+                    recursive=True,
+                )
+                assert fs.ls(target, detail=False) == (
+                    [] if supports_empty_directories else [dummy]
+                )
+
+    def test_put_glob_to_new_directory(
+        self, fs, fs_join, fs_target, local_join, local_bulk_operations_scenario_0
+    ):
+        # Copy scenario 1h
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        for target_slash in [False, True]:
+            t = fs_join(target, "newdir")
+            if target_slash:
+                t += "/"
+
+            # Without recursive
+            fs.put(local_join(source, "subdir", "*"), t)
+            assert fs.isdir(fs_join(target, "newdir"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+            assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+            assert not fs.exists(fs_join(target, "newdir", "nesteddir"))
+            assert not fs.exists(fs_join(target, "newdir", "nesteddir", "nestedfile"))
+            assert not fs.exists(fs_join(target, "subdir"))
+            assert not fs.exists(fs_join(target, "newdir", "subdir"))
+
+            fs.rm(fs_join(target, "newdir"), recursive=True)
+            assert not fs.exists(fs_join(target, "newdir"))
+
+            # With recursive
+            for glob, recursive in zip(["*", "**"], [True, False]):
+                fs.put(local_join(source, "subdir", glob), t, recursive=recursive)
+                assert fs.isdir(fs_join(target, "newdir"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+                assert fs.isdir(fs_join(target, "newdir", "nesteddir"))
+                assert fs.isfile(fs_join(target, "newdir", "nesteddir", "nestedfile"))
+                assert not fs.exists(fs_join(target, "subdir"))
+                assert not fs.exists(fs_join(target, "newdir", "subdir"))
+
+                fs.rm(fs_join(target, "newdir"), recursive=True)
+                assert not fs.exists(fs_join(target, "newdir"))
+
+                # Limit recursive by maxdepth
+                fs.put(
+                    local_join(source, "subdir", glob),
+                    t,
+                    recursive=recursive,
+                    maxdepth=1,
+                )
+                assert fs.isdir(fs_join(target, "newdir"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+                assert fs.isfile(fs_join(target, "newdir", "subfile2"))
+                assert not fs.exists(fs_join(target, "newdir", "nesteddir"))
+                assert not fs.exists(fs_join(target, "subdir"))
+                assert not fs.exists(fs_join(target, "newdir", "subdir"))
+
+                fs.rm(fs_join(target, "newdir"), recursive=True)
+                assert not fs.exists(fs_join(target, "newdir"))
+
+    @pytest.mark.parametrize(
+        GLOB_EDGE_CASES_TESTS["argnames"],
+        GLOB_EDGE_CASES_TESTS["argvalues"],
+    )
+    def test_put_glob_edge_cases(
+        self,
+        path,
+        recursive,
+        maxdepth,
+        expected,
+        fs,
+        fs_join,
+        fs_target,
+        local_glob_edge_cases_files,
+        local_join,
+        fs_sanitize_path,
+    ):
+        # Copy scenario 1g
+        source = local_glob_edge_cases_files
+
+        target = fs_target
+
+        for new_dir, target_slash in product([True, False], [True, False]):
+            fs.mkdir(target)
+
+            t = fs_join(target, "newdir") if new_dir else target
+            t = t + "/" if target_slash else t
+
+            fs.put(local_join(source, path), t, recursive=recursive, maxdepth=maxdepth)
+
+            output = fs.find(target)
+            if new_dir:
+                prefixed_expected = [
+                    fs_sanitize_path(fs_join(target, "newdir", p)) for p in expected
+                ]
+            else:
+                prefixed_expected = [
+                    fs_sanitize_path(fs_join(target, p)) for p in expected
+                ]
+            assert sorted(output) == sorted(prefixed_expected)
+
+            try:
+                fs.rm(target, recursive=True)
+            except FileNotFoundError:
+                pass
+
+    def test_put_list_of_files_to_existing_directory(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        local_join,
+        local_bulk_operations_scenario_0,
+        supports_empty_directories,
+    ):
+        # Copy scenario 2a
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+        if not supports_empty_directories:
+            # Force target directory to exist by adding a dummy file
+            dummy = fs_join(target, "dummy")
+            fs.touch(dummy)
+        assert fs.isdir(target)
+
+        source_files = [
+            local_join(source, "file1"),
+            local_join(source, "file2"),
+            local_join(source, "subdir", "subfile1"),
+        ]
+
+        for target_slash in [False, True]:
+            t = target + "/" if target_slash else target
+
+            fs.put(source_files, t)
+            assert fs.isfile(fs_join(target, "file1"))
+            assert fs.isfile(fs_join(target, "file2"))
+            assert fs.isfile(fs_join(target, "subfile1"))
+
+            fs.rm(
+                [
+                    fs_join(target, "file1"),
+                    fs_join(target, "file2"),
+                    fs_join(target, "subfile1"),
+                ],
+                recursive=True,
+            )
+            assert fs.ls(target, detail=False) == (
+                [] if supports_empty_directories else [dummy]
+            )
+
+    def test_put_list_of_files_to_new_directory(
+        self, fs, fs_join, fs_target, local_join, local_bulk_operations_scenario_0
+    ):
+        # Copy scenario 2b
+        source = local_bulk_operations_scenario_0
+
+        target = fs_target
+        fs.mkdir(target)
+
+        source_files = [
+            local_join(source, "file1"),
+            local_join(source, "file2"),
+            local_join(source, "subdir", "subfile1"),
+        ]
+
+        fs.put(source_files, fs_join(target, "newdir") + "/")  # Note trailing slash
+        assert fs.isdir(fs_join(target, "newdir"))
+        assert fs.isfile(fs_join(target, "newdir", "file1"))
+        assert fs.isfile(fs_join(target, "newdir", "file2"))
+        assert fs.isfile(fs_join(target, "newdir", "subfile1"))
+
+    def test_put_directory_recursive(
+        self, fs, fs_join, fs_target, local_fs, local_join, local_path
+    ):
+        # https://github.com/fsspec/filesystem_spec/issues/1062
+        # Recursive cp/get/put of source directory into non-existent target directory.
+        src = local_join(local_path, "src")
+        src_file = local_join(src, "file")
+        local_fs.mkdir(src)
+        local_fs.touch(src_file)
+
+        target = fs_target
+
+        # put without slash
+        assert not fs.exists(target)
+        for loop in range(2):
+            fs.put(src, target, recursive=True)
+            assert fs.isdir(target)
+
+            if loop == 0:
+                assert fs.isfile(fs_join(target, "file"))
+                assert not fs.exists(fs_join(target, "src"))
+            else:
+                assert fs.isfile(fs_join(target, "file"))
+                assert fs.isdir(fs_join(target, "src"))
+                assert fs.isfile(fs_join(target, "src", "file"))
+
+        fs.rm(target, recursive=True)
+
+        # put with slash
+        assert not fs.exists(target)
+        for loop in range(2):
+            fs.put(src + "/", target, recursive=True)
+            assert fs.isdir(target)
+            assert fs.isfile(fs_join(target, "file"))
+            assert not fs.exists(fs_join(target, "src"))
+
+    def test_put_directory_without_files_with_same_name_prefix(
+        self,
+        fs,
+        fs_join,
+        fs_target,
+        local_join,
+        local_dir_and_file_with_same_name_prefix,
+        supports_empty_directories,
+    ):
+        # Create the test dirs
+        source = local_dir_and_file_with_same_name_prefix
+        target = fs_target
+
+        # Test without glob
+        fs.put(local_join(source, "subdir"), fs_target, recursive=True)
+
+        assert fs.isfile(fs_join(fs_target, "subfile.txt"))
+        assert not fs.isfile(fs_join(fs_target, "subdir.txt"))
+
+        fs.rm([fs_join(target, "subfile.txt")])
+        if supports_empty_directories:
+            assert fs.ls(target) == []
+        else:
+            assert not fs.exists(target)
+
+        # Test with glob
+        fs.put(local_join(source, "subdir*"), fs_target, recursive=True)
+
+        assert fs.isdir(fs_join(fs_target, "subdir"))
+        assert fs.isfile(fs_join(fs_target, "subdir", "subfile.txt"))
+        assert fs.isfile(fs_join(fs_target, "subdir.txt"))
+
+    def test_copy_with_source_and_destination_as_list(
+        self, fs, fs_target, fs_join, local_join, local_10_files_with_hashed_names
+    ):
+        # Create the test dir
+        source = local_10_files_with_hashed_names
+        target = fs_target
+
+        # Create list of files for source and destination
+        source_files = []
+        destination_files = []
+        for i in range(10):
+            hashed_i = md5(str(i).encode("utf-8")).hexdigest()
+            source_files.append(local_join(source, f"{hashed_i}.txt"))
+            destination_files.append(fs_join(target, f"{hashed_i}.txt"))
+
+        # Copy and assert order was kept
+        fs.put(lpath=source_files, rpath=destination_files)
+
+        for i in range(10):
+            file_content = fs.cat(destination_files[i]).decode("utf-8")
+            assert file_content == str(i)

backend_service/venv/lib/python3.13/site-packages/fsspec/transaction.py

@@ -0,0 +1,90 @@
+from collections import deque
+
+
+class Transaction:
+    """Filesystem transaction write context
+
+    Gathers files for deferred commit or discard, so that several write
+    operations can be finalized semi-atomically. This works by having this
+    instance as the ``.transaction`` attribute of the given filesystem
+    """
+
+    def __init__(self, fs, **kwargs):
+        """
+        Parameters
+        ----------
+        fs: FileSystem instance
+        """
+        self.fs = fs
+        self.files = deque()
+
+    def __enter__(self):
+        self.start()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """End transaction and commit, if exit is not due to exception"""
+        # only commit if there was no exception
+        self.complete(commit=exc_type is None)
+        if self.fs:
+            self.fs._intrans = False
+            self.fs._transaction = None
+            self.fs = None
+
+    def start(self):
+        """Start a transaction on this FileSystem"""
+        self.files = deque()  # clean up after previous failed completions
+        self.fs._intrans = True
+
+    def complete(self, commit=True):
+        """Finish transaction: commit or discard all deferred files"""
+        while self.files:
+            f = self.files.popleft()
+            if commit:
+                f.commit()
+            else:
+                f.discard()
+        self.fs._intrans = False
+        self.fs._transaction = None
+        self.fs = None
+
+
+class FileActor:
+    def __init__(self):
+        self.files = []
+
+    def commit(self):
+        for f in self.files:
+            f.commit()
+        self.files.clear()
+
+    def discard(self):
+        for f in self.files:
+            f.discard()
+        self.files.clear()
+
+    def append(self, f):
+        self.files.append(f)
+
+
+class DaskTransaction(Transaction):
+    def __init__(self, fs):
+        """
+        Parameters
+        ----------
+        fs: FileSystem instance
+        """
+        import distributed
+
+        super().__init__(fs)
+        client = distributed.default_client()
+        self.files = client.submit(FileActor, actor=True).result()
+
+    def complete(self, commit=True):
+        """Finish transaction: commit or discard all deferred files"""
+        if commit:
+            self.files.commit().result()
+        else:
+            self.files.discard().result()
+        self.fs._intrans = False
+        self.fs = None

backend_service/venv/lib/python3.13/site-packages/fsspec/utils.py

@@ -0,0 +1,745 @@
+from __future__ import annotations
+
+import contextlib
+import logging
+import math
+import os
+import re
+import sys
+import tempfile
+from collections.abc import Iterable, Iterator, Sequence
+from functools import partial
+from hashlib import md5
+from importlib.metadata import version
+from typing import (
+    IO,
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    TypeVar,
+)
+from urllib.parse import urlsplit
+
+if TYPE_CHECKING:
+    import pathlib
+
+    from typing_extensions import TypeGuard
+
+    from fsspec.spec import AbstractFileSystem
+
+
+DEFAULT_BLOCK_SIZE = 5 * 2**20
+
+T = TypeVar("T")
+
+
+def infer_storage_options(
+    urlpath: str, inherit_storage_options: dict[str, Any] | None = None
+) -> dict[str, Any]:
+    """Infer storage options from URL path and merge it with existing storage
+    options.
+
+    Parameters
+    ----------
+    urlpath: str or unicode
+        Either local absolute file path or URL (hdfs://namenode:8020/file.csv)
+    inherit_storage_options: dict (optional)
+        Its contents will get merged with the inferred information from the
+        given path
+
+    Returns
+    -------
+    Storage options dict.
+
+    Examples
+    --------
+    >>> infer_storage_options('/mnt/datasets/test.csv')  # doctest: +SKIP
+    {"protocol": "file", "path", "/mnt/datasets/test.csv"}
+    >>> infer_storage_options(
+    ...     'hdfs://username:pwd@node:123/mnt/datasets/test.csv?q=1',
+    ...     inherit_storage_options={'extra': 'value'},
+    ... )  # doctest: +SKIP
+    {"protocol": "hdfs", "username": "username", "password": "pwd",
+    "host": "node", "port": 123, "path": "/mnt/datasets/test.csv",
+    "url_query": "q=1", "extra": "value"}
+    """
+    # Handle Windows paths including disk name in this special case
+    if (
+        re.match(r"^[a-zA-Z]:[\\/]", urlpath)
+        or re.match(r"^[a-zA-Z0-9]+://", urlpath) is None
+    ):
+        return {"protocol": "file", "path": urlpath}
+
+    parsed_path = urlsplit(urlpath)
+    protocol = parsed_path.scheme or "file"
+    if parsed_path.fragment:
+        path = "#".join([parsed_path.path, parsed_path.fragment])
+    else:
+        path = parsed_path.path
+    if protocol == "file":
+        # Special case parsing file protocol URL on Windows according to:
+        # https://msdn.microsoft.com/en-us/library/jj710207.aspx
+        windows_path = re.match(r"^/([a-zA-Z])[:|]([\\/].*)$", path)
+        if windows_path:
+            drive, path = windows_path.groups()
+            path = f"{drive}:{path}"
+
+    if protocol in ["http", "https"]:
+        # for HTTP, we don't want to parse, as requests will anyway
+        return {"protocol": protocol, "path": urlpath}
+
+    options: dict[str, Any] = {"protocol": protocol, "path": path}
+
+    if parsed_path.netloc:
+        # Parse `hostname` from netloc manually because `parsed_path.hostname`
+        # lowercases the hostname which is not always desirable (e.g. in S3):
+        # https://github.com/dask/dask/issues/1417
+        options["host"] = parsed_path.netloc.rsplit("@", 1)[-1].rsplit(":", 1)[0]
+
+        if protocol in ("s3", "s3a", "gcs", "gs"):
+            options["path"] = options["host"] + options["path"]
+        else:
+            options["host"] = options["host"]
+        if parsed_path.port:
+            options["port"] = parsed_path.port
+        if parsed_path.username:
+            options["username"] = parsed_path.username
+        if parsed_path.password:
+            options["password"] = parsed_path.password
+
+    if parsed_path.query:
+        options["url_query"] = parsed_path.query
+    if parsed_path.fragment:
+        options["url_fragment"] = parsed_path.fragment
+
+    if inherit_storage_options:
+        update_storage_options(options, inherit_storage_options)
+
+    return options
+
+
+def update_storage_options(
+    options: dict[str, Any], inherited: dict[str, Any] | None = None
+) -> None:
+    if not inherited:
+        inherited = {}
+    collisions = set(options) & set(inherited)
+    if collisions:
+        for collision in collisions:
+            if options.get(collision) != inherited.get(collision):
+                raise KeyError(
+                    f"Collision between inferred and specified storage "
+                    f"option:\n{collision}"
+                )
+    options.update(inherited)
+
+
+# Compression extensions registered via fsspec.compression.register_compression
+compressions: dict[str, str] = {}
+
+
+def infer_compression(filename: str) -> str | None:
+    """Infer compression, if available, from filename.
+
+    Infer a named compression type, if registered and available, from filename
+    extension. This includes builtin (gz, bz2, zip) compressions, as well as
+    optional compressions. See fsspec.compression.register_compression.
+    """
+    extension = os.path.splitext(filename)[-1].strip(".").lower()
+    if extension in compressions:
+        return compressions[extension]
+    return None
+
+
+def build_name_function(max_int: float) -> Callable[[int], str]:
+    """Returns a function that receives a single integer
+    and returns it as a string padded by enough zero characters
+    to align with maximum possible integer
+
+    >>> name_f = build_name_function(57)
+
+    >>> name_f(7)
+    '07'
+    >>> name_f(31)
+    '31'
+    >>> build_name_function(1000)(42)
+    '0042'
+    >>> build_name_function(999)(42)
+    '042'
+    >>> build_name_function(0)(0)
+    '0'
+    """
+    # handle corner cases max_int is 0 or exact power of 10
+    max_int += 1e-8
+
+    pad_length = int(math.ceil(math.log10(max_int)))
+
+    def name_function(i: int) -> str:
+        return str(i).zfill(pad_length)
+
+    return name_function
+
+
+def seek_delimiter(file: IO[bytes], delimiter: bytes, blocksize: int) -> bool:
+    r"""Seek current file to file start, file end, or byte after delimiter seq.
+
+    Seeks file to next chunk delimiter, where chunks are defined on file start,
+    a delimiting sequence, and file end. Use file.tell() to see location afterwards.
+    Note that file start is a valid split, so must be at offset > 0 to seek for
+    delimiter.
+
+    Parameters
+    ----------
+    file: a file
+    delimiter: bytes
+        a delimiter like ``b'\n'`` or message sentinel, matching file .read() type
+    blocksize: int
+        Number of bytes to read from the file at once.
+
+
+    Returns
+    -------
+    Returns True if a delimiter was found, False if at file start or end.
+
+    """
+
+    if file.tell() == 0:
+        # beginning-of-file, return without seek
+        return False
+
+    # Interface is for binary IO, with delimiter as bytes, but initialize last
+    # with result of file.read to preserve compatibility with text IO.
+    last: bytes | None = None
+    while True:
+        current = file.read(blocksize)
+        if not current:
+            # end-of-file without delimiter
+            return False
+        full = last + current if last else current
+        try:
+            if delimiter in full:
+                i = full.index(delimiter)
+                file.seek(file.tell() - (len(full) - i) + len(delimiter))
+                return True
+            elif len(current) < blocksize:
+                # end-of-file without delimiter
+                return False
+        except (OSError, ValueError):
+            pass
+        last = full[-len(delimiter) :]
+
+
+def read_block(
+    f: IO[bytes],
+    offset: int,
+    length: int | None,
+    delimiter: bytes | None = None,
+    split_before: bool = False,
+) -> bytes:
+    """Read a block of bytes from a file
+
+    Parameters
+    ----------
+    f: File
+        Open file
+    offset: int
+        Byte offset to start read
+    length: int
+        Number of bytes to read, read through end of file if None
+    delimiter: bytes (optional)
+        Ensure reading starts and stops at delimiter bytestring
+    split_before: bool (optional)
+        Start/stop read *before* delimiter bytestring.
+
+
+    If using the ``delimiter=`` keyword argument we ensure that the read
+    starts and stops at delimiter boundaries that follow the locations
+    ``offset`` and ``offset + length``.  If ``offset`` is zero then we
+    start at zero, regardless of delimiter.  The bytestring returned WILL
+    include the terminating delimiter string.
+
+    Examples
+    --------
+
+    >>> from io import BytesIO  # doctest: +SKIP
+    >>> f = BytesIO(b'Alice, 100\\nBob, 200\\nCharlie, 300')  # doctest: +SKIP
+    >>> read_block(f, 0, 13)  # doctest: +SKIP
+    b'Alice, 100\\nBo'
+
+    >>> read_block(f, 0, 13, delimiter=b'\\n')  # doctest: +SKIP
+    b'Alice, 100\\nBob, 200\\n'
+
+    >>> read_block(f, 10, 10, delimiter=b'\\n')  # doctest: +SKIP
+    b'Bob, 200\\nCharlie, 300'
+    """
+    if delimiter:
+        f.seek(offset)
+        found_start_delim = seek_delimiter(f, delimiter, 2**16)
+        if length is None:
+            return f.read()
+        start = f.tell()
+        length -= start - offset
+
+        f.seek(start + length)
+        found_end_delim = seek_delimiter(f, delimiter, 2**16)
+        end = f.tell()
+
+        # Adjust split location to before delimiter if seek found the
+        # delimiter sequence, not start or end of file.
+        if found_start_delim and split_before:
+            start -= len(delimiter)
+
+        if found_end_delim and split_before:
+            end -= len(delimiter)
+
+        offset = start
+        length = end - start
+
+    f.seek(offset)
+
+    # TODO: allow length to be None and read to the end of the file?
+    assert length is not None
+    b = f.read(length)
+    return b
+
+
+def tokenize(*args: Any, **kwargs: Any) -> str:
+    """Deterministic token
+
+    (modified from dask.base)
+
+    >>> tokenize([1, 2, '3'])
+    '9d71491b50023b06fc76928e6eddb952'
+
+    >>> tokenize('Hello') == tokenize('Hello')
+    True
+    """
+    if kwargs:
+        args += (kwargs,)
+    try:
+        h = md5(str(args).encode())
+    except ValueError:
+        # FIPS systems: https://github.com/fsspec/filesystem_spec/issues/380
+        h = md5(str(args).encode(), usedforsecurity=False)
+    return h.hexdigest()
+
+
+def stringify_path(filepath: str | os.PathLike[str] | pathlib.Path) -> str:
+    """Attempt to convert a path-like object to a string.
+
+    Parameters
+    ----------
+    filepath: object to be converted
+
+    Returns
+    -------
+    filepath_str: maybe a string version of the object
+
+    Notes
+    -----
+    Objects supporting the fspath protocol are coerced according to its
+    __fspath__ method.
+
+    For backwards compatibility with older Python version, pathlib.Path
+    objects are specially coerced.
+
+    Any other object is passed through unchanged, which includes bytes,
+    strings, buffers, or anything else that's not even path-like.
+    """
+    if isinstance(filepath, str):
+        return filepath
+    elif hasattr(filepath, "__fspath__"):
+        return filepath.__fspath__()
+    elif hasattr(filepath, "path"):
+        return filepath.path
+    else:
+        return filepath  # type: ignore[return-value]
+
+
+def make_instance(
+    cls: Callable[..., T], args: Sequence[Any], kwargs: dict[str, Any]
+) -> T:
+    inst = cls(*args, **kwargs)
+    inst._determine_worker()  # type: ignore[attr-defined]
+    return inst
+
+
+def common_prefix(paths: Iterable[str]) -> str:
+    """For a list of paths, find the shortest prefix common to all"""
+    parts = [p.split("/") for p in paths]
+    lmax = min(len(p) for p in parts)
+    end = 0
+    for i in range(lmax):
+        end = all(p[i] == parts[0][i] for p in parts)
+        if not end:
+            break
+    i += end
+    return "/".join(parts[0][:i])
+
+
+def other_paths(
+    paths: list[str],
+    path2: str | list[str],
+    exists: bool = False,
+    flatten: bool = False,
+) -> list[str]:
+    """In bulk file operations, construct a new file tree from a list of files
+
+    Parameters
+    ----------
+    paths: list of str
+        The input file tree
+    path2: str or list of str
+        Root to construct the new list in. If this is already a list of str, we just
+        assert it has the right number of elements.
+    exists: bool (optional)
+        For a str destination, it is already exists (and is a dir), files should
+        end up inside.
+    flatten: bool (optional)
+        Whether to flatten the input directory tree structure so that the output files
+        are in the same directory.
+
+    Returns
+    -------
+    list of str
+    """
+
+    if isinstance(path2, str):
+        path2 = path2.rstrip("/")
+
+        if flatten:
+            path2 = ["/".join((path2, p.split("/")[-1])) for p in paths]
+        else:
+            cp = common_prefix(paths)
+            if exists:
+                cp = cp.rsplit("/", 1)[0]
+            if not cp and all(not s.startswith("/") for s in paths):
+                path2 = ["/".join([path2, p]) for p in paths]
+            else:
+                path2 = [p.replace(cp, path2, 1) for p in paths]
+    else:
+        assert len(paths) == len(path2)
+    return path2
+
+
+def is_exception(obj: Any) -> bool:
+    return isinstance(obj, BaseException)
+
+
+def isfilelike(f: Any) -> TypeGuard[IO[bytes]]:
+    return all(hasattr(f, attr) for attr in ["read", "close", "tell"])
+
+
+def get_protocol(url: str) -> str:
+    url = stringify_path(url)
+    parts = re.split(r"(\:\:|\://)", url, maxsplit=1)
+    if len(parts) > 1:
+        return parts[0]
+    return "file"
+
+
+def get_file_extension(url: str) -> str:
+    url = stringify_path(url)
+    ext_parts = url.rsplit(".", 1)
+    if len(ext_parts) > 1:
+        return ext_parts[-1]
+    return ""
+
+
+def can_be_local(path: str) -> bool:
+    """Can the given URL be used with open_local?"""
+    from fsspec import get_filesystem_class
+
+    try:
+        return getattr(get_filesystem_class(get_protocol(path)), "local_file", False)
+    except (ValueError, ImportError):
+        # not in registry or import failed
+        return False
+
+
+def get_package_version_without_import(name: str) -> str | None:
+    """For given package name, try to find the version without importing it
+
+    Import and package.__version__ is still the backup here, so an import
+    *might* happen.
+
+    Returns either the version string, or None if the package
+    or the version was not readily  found.
+    """
+    if name in sys.modules:
+        mod = sys.modules[name]
+        if hasattr(mod, "__version__"):
+            return mod.__version__
+    try:
+        return version(name)
+    except:  # noqa: E722
+        pass
+    try:
+        import importlib
+
+        mod = importlib.import_module(name)
+        return mod.__version__
+    except (ImportError, AttributeError):
+        return None
+
+
+def setup_logging(
+    logger: logging.Logger | None = None,
+    logger_name: str | None = None,
+    level: str = "DEBUG",
+    clear: bool = True,
+) -> logging.Logger:
+    if logger is None and logger_name is None:
+        raise ValueError("Provide either logger object or logger name")
+    logger = logger or logging.getLogger(logger_name)
+    handle = logging.StreamHandler()
+    formatter = logging.Formatter(
+        "%(asctime)s - %(name)s - %(levelname)s - %(funcName)s -- %(message)s"
+    )
+    handle.setFormatter(formatter)
+    if clear:
+        logger.handlers.clear()
+    logger.addHandler(handle)
+    logger.setLevel(level)
+    return logger
+
+
+def _unstrip_protocol(name: str, fs: AbstractFileSystem) -> str:
+    return fs.unstrip_protocol(name)
+
+
+def mirror_from(
+    origin_name: str, methods: Iterable[str]
+) -> Callable[[type[T]], type[T]]:
+    """Mirror attributes and methods from the given
+    origin_name attribute of the instance to the
+    decorated class"""
+
+    def origin_getter(method: str, self: Any) -> Any:
+        origin = getattr(self, origin_name)
+        return getattr(origin, method)
+
+    def wrapper(cls: type[T]) -> type[T]:
+        for method in methods:
+            wrapped_method = partial(origin_getter, method)
+            setattr(cls, method, property(wrapped_method))
+        return cls
+
+    return wrapper
+
+
+@contextlib.contextmanager
+def nullcontext(obj: T) -> Iterator[T]:
+    yield obj
+
+
+def merge_offset_ranges(
+    paths: list[str],
+    starts: list[int] | int,
+    ends: list[int] | int,
+    max_gap: int = 0,
+    max_block: int | None = None,
+    sort: bool = True,
+) -> tuple[list[str], list[int], list[int]]:
+    """Merge adjacent byte-offset ranges when the inter-range
+    gap is <= `max_gap`, and when the merged byte range does not
+    exceed `max_block` (if specified). By default, this function
+    will re-order the input paths and byte ranges to ensure sorted
+    order. If the user can guarantee that the inputs are already
+    sorted, passing `sort=False` will skip the re-ordering.
+    """
+    # Check input
+    if not isinstance(paths, list):
+        raise TypeError
+    if not isinstance(starts, list):
+        starts = [starts] * len(paths)
+    if not isinstance(ends, list):
+        ends = [ends] * len(paths)
+    if len(starts) != len(paths) or len(ends) != len(paths):
+        raise ValueError
+
+    # Early Return
+    if len(starts) <= 1:
+        return paths, starts, ends
+
+    starts = [s or 0 for s in starts]
+    # Sort by paths and then ranges if `sort=True`
+    if sort:
+        paths, starts, ends = (
+            list(v)
+            for v in zip(
+                *sorted(
+                    zip(paths, starts, ends),
+                )
+            )
+        )
+
+    if paths:
+        # Loop through the coupled `paths`, `starts`, and
+        # `ends`, and merge adjacent blocks when appropriate
+        new_paths = paths[:1]
+        new_starts = starts[:1]
+        new_ends = ends[:1]
+        for i in range(1, len(paths)):
+            if paths[i] == paths[i - 1] and new_ends[-1] is None:
+                continue
+            elif (
+                paths[i] != paths[i - 1]
+                or ((starts[i] - new_ends[-1]) > max_gap)
+                or (max_block is not None and (ends[i] - new_starts[-1]) > max_block)
+            ):
+                # Cannot merge with previous block.
+                # Add new `paths`, `starts`, and `ends` elements
+                new_paths.append(paths[i])
+                new_starts.append(starts[i])
+                new_ends.append(ends[i])
+            else:
+                # Merge with previous block by updating the
+                # last element of `ends`
+                new_ends[-1] = ends[i]
+        return new_paths, new_starts, new_ends
+
+    # `paths` is empty. Just return input lists
+    return paths, starts, ends
+
+
+def file_size(filelike: IO[bytes]) -> int:
+    """Find length of any open read-mode file-like"""
+    pos = filelike.tell()
+    try:
+        return filelike.seek(0, 2)
+    finally:
+        filelike.seek(pos)
+
+
+@contextlib.contextmanager
+def atomic_write(path: str, mode: str = "wb"):
+    """
+    A context manager that opens a temporary file next to `path` and, on exit,
+    replaces `path` with the temporary file, thereby updating `path`
+    atomically.
+    """
+    fd, fn = tempfile.mkstemp(
+        dir=os.path.dirname(path), prefix=os.path.basename(path) + "-"
+    )
+    try:
+        with open(fd, mode) as fp:
+            yield fp
+    except BaseException:
+        with contextlib.suppress(FileNotFoundError):
+            os.unlink(fn)
+        raise
+    else:
+        os.replace(fn, path)
+
+
+def _translate(pat, STAR, QUESTION_MARK):
+    # Copied from: https://github.com/python/cpython/pull/106703.
+    res: list[str] = []
+    add = res.append
+    i, n = 0, len(pat)
+    while i < n:
+        c = pat[i]
+        i = i + 1
+        if c == "*":
+            # compress consecutive `*` into one
+            if (not res) or res[-1] is not STAR:
+                add(STAR)
+        elif c == "?":
+            add(QUESTION_MARK)
+        elif c == "[":
+            j = i
+            if j < n and pat[j] == "!":
+                j = j + 1
+            if j < n and pat[j] == "]":
+                j = j + 1
+            while j < n and pat[j] != "]":
+                j = j + 1
+            if j >= n:
+                add("\\[")
+            else:
+                stuff = pat[i:j]
+                if "-" not in stuff:
+                    stuff = stuff.replace("\\", r"\\")
+                else:
+                    chunks = []
+                    k = i + 2 if pat[i] == "!" else i + 1
+                    while True:
+                        k = pat.find("-", k, j)
+                        if k < 0:
+                            break
+                        chunks.append(pat[i:k])
+                        i = k + 1
+                        k = k + 3
+                    chunk = pat[i:j]
+                    if chunk:
+                        chunks.append(chunk)
+                    else:
+                        chunks[-1] += "-"
+                    # Remove empty ranges -- invalid in RE.
+                    for k in range(len(chunks) - 1, 0, -1):
+                        if chunks[k - 1][-1] > chunks[k][0]:
+                            chunks[k - 1] = chunks[k - 1][:-1] + chunks[k][1:]
+                            del chunks[k]
+                    # Escape backslashes and hyphens for set difference (--).
+                    # Hyphens that create ranges shouldn't be escaped.
+                    stuff = "-".join(
+                        s.replace("\\", r"\\").replace("-", r"\-") for s in chunks
+                    )
+                # Escape set operations (&&, ~~ and ||).
+                stuff = re.sub(r"([&~|])", r"\\\1", stuff)
+                i = j + 1
+                if not stuff:
+                    # Empty range: never match.
+                    add("(?!)")
+                elif stuff == "!":
+                    # Negated empty range: match any character.
+                    add(".")
+                else:
+                    if stuff[0] == "!":
+                        stuff = "^" + stuff[1:]
+                    elif stuff[0] in ("^", "["):
+                        stuff = "\\" + stuff
+                    add(f"[{stuff}]")
+        else:
+            add(re.escape(c))
+    assert i == n
+    return res
+
+
+def glob_translate(pat):
+    # Copied from: https://github.com/python/cpython/pull/106703.
+    # The keyword parameters' values are fixed to:
+    # recursive=True, include_hidden=True, seps=None
+    """Translate a pathname with shell wildcards to a regular expression."""
+    if os.path.altsep:
+        seps = os.path.sep + os.path.altsep
+    else:
+        seps = os.path.sep
+    escaped_seps = "".join(map(re.escape, seps))
+    any_sep = f"[{escaped_seps}]" if len(seps) > 1 else escaped_seps
+    not_sep = f"[^{escaped_seps}]"
+    one_last_segment = f"{not_sep}+"
+    one_segment = f"{one_last_segment}{any_sep}"
+    any_segments = f"(?:.+{any_sep})?"
+    any_last_segments = ".*"
+    results = []
+    parts = re.split(any_sep, pat)
+    last_part_idx = len(parts) - 1
+    for idx, part in enumerate(parts):
+        if part == "*":
+            results.append(one_segment if idx < last_part_idx else one_last_segment)
+            continue
+        if part == "**":
+            results.append(any_segments if idx < last_part_idx else any_last_segments)
+            continue
+        elif "**" in part:
+            raise ValueError(
+                "Invalid pattern: '**' can only be an entire path component"
+            )
+        if part:
+            results.extend(_translate(part, f"{not_sep}*", not_sep))
+        if idx < last_part_idx:
+            results.append(any_sep)
+    res = "".join(results)
+    return rf"(?s:{res})\Z"