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89 lines
2.6 KiB
89 lines
2.6 KiB
from functools import lru_cache
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from importlib import import_module
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from pathlib import Path, PurePath
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from urllib.parse import quote
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import logging
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from fastapi import status
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from ..exceptions import HttpError
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from django.conf import settings
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from django.core.exceptions import ImproperlyConfigured
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logger = logging.getLogger(__name__)
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@lru_cache(maxsize=None)
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def _get_sendfile():
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backend = getattr(settings, "SENDFILE_BACKEND", None)
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if not backend:
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raise ImproperlyConfigured("You must specify a value for SENDFILE_BACKEND")
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module = import_module(backend)
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return module.sendfile
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def _convert_file_to_url(path):
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try:
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url_root = PurePath(getattr(settings, "SENDFILE_URL", None))
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except TypeError:
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return path
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path_root = PurePath(settings.SENDFILE_ROOT)
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path_obj = PurePath(path)
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relpath = path_obj.relative_to(path_root)
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# Python 3.5: Path.resolve() has no `strict` kwarg, so use pathmod from an
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# already instantiated Path object
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url = relpath._flavour.pathmod.normpath(str(url_root / relpath))
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return quote(str(url))
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def _sanitize_path(filepath):
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try:
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path_root = Path(getattr(settings, "SENDFILE_ROOT", None))
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except TypeError:
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raise ImproperlyConfigured("You must specify a value for SENDFILE_ROOT")
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filepath_obj = Path(filepath)
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# get absolute path
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# Python 3.5: Path.resolve() has no `strict` kwarg, so use pathmod from an
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# already instantiated Path object
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filepath_abs = Path(filepath_obj._flavour.pathmod.normpath(str(path_root / filepath_obj)))
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# if filepath_abs is not relative to path_root, relative_to throws an error
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try:
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filepath_abs.relative_to(path_root)
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except ValueError:
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raise HttpError(
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"generic", "{} wrt {} is impossible".format(filepath_abs, path_root), status_code=status.HTTP_404_NOT_FOUND
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)
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return filepath_abs
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def sendfile(filename, mimetype="application/octet-stream", encoding=None):
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"""
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Create a response to send file using backend configured in ``SENDFILE_BACKEND``
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``filename`` is the absolute path to the file to send.
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"""
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filepath_obj = _sanitize_path(filename)
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logger.debug(
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"filename '%s' requested \"\
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\"-> filepath '%s' obtained",
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filename,
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filepath_obj,
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)
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_sendfile = _get_sendfile()
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if not filepath_obj.exists():
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raise HttpError("does_not_exist", '"%s" does not exist' % filepath_obj, status_code=status.HTTP_404_NOT_FOUND)
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response = _sendfile(filepath_obj, mimetype=mimetype)
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response.headers["Content-Type"] = mimetype
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return response
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