86 lines
2.5 KiB
Python
86 lines
2.5 KiB
Python
|
from functools import lru_cache
|
||
|
|
from importlib import import_module
|
||
|
|
from pathlib import Path, PurePath
|
||
|
|
from urllib.parse import quote
|
||
|
|
import logging
|
||
|
|
|
||
|
|
from django.conf import settings
|
||
|
|
from django.core.exceptions import ImproperlyConfigured
|
||
|
|
from django.http import Http404
|
||
|
|
|
||
|
|
logger = logging.getLogger(__name__)
|
||
|
|
|
||
|
|
|
||
|
|
@lru_cache(maxsize=None)
|
||
|
|
def _get_sendfile():
|
||
|
|
backend = getattr(settings, "SENDFILE_BACKEND", None)
|
||
|
|
if not backend:
|
||
|
|
raise ImproperlyConfigured("You must specify a value for SENDFILE_BACKEND")
|
||
|
|
module = import_module(backend)
|
||
|
|
return module.sendfile
|
||
|
|
|
||
|
|
|
||
|
|
def _convert_file_to_url(path):
|
||
|
|
try:
|
||
|
|
url_root = PurePath(getattr(settings, "SENDFILE_URL", None))
|
||
|
|
except TypeError:
|
||
|
|
return path
|
||
|
|
|
||
|
|
path_root = PurePath(settings.SENDFILE_ROOT)
|
||
|
|
path_obj = PurePath(path)
|
||
|
|
|
||
|
|
relpath = path_obj.relative_to(path_root)
|
||
|
|
# Python 3.5: Path.resolve() has no `strict` kwarg, so use pathmod from an
|
||
|
|
# already instantiated Path object
|
||
|
|
url = relpath._flavour.pathmod.normpath(str(url_root / relpath))
|
||
|
|
|
||
|
|
return quote(str(url))
|
||
|
|
|
||
|
|
|
||
|
|
def _sanitize_path(filepath):
|
||
|
|
try:
|
||
|
|
path_root = Path(getattr(settings, "SENDFILE_ROOT", None))
|
||
|
|
except TypeError:
|
||
|
|
raise ImproperlyConfigured("You must specify a value for SENDFILE_ROOT")
|
||
|
|
|
||
|
|
filepath_obj = Path(filepath)
|
||
|
|
|
||
|
|
# get absolute path
|
||
|
|
# Python 3.5: Path.resolve() has no `strict` kwarg, so use pathmod from an
|
||
|
|
# already instantiated Path object
|
||
|
|
filepath_abs = Path(filepath_obj._flavour.pathmod.normpath(str(path_root / filepath_obj)))
|
||
|
|
|
||
|
|
# if filepath_abs is not relative to path_root, relative_to throws an error
|
||
|
|
try:
|
||
|
|
filepath_abs.relative_to(path_root)
|
||
|
|
except ValueError:
|
||
|
|
raise Http404("{} wrt {} is impossible".format(filepath_abs, path_root))
|
||
|
|
|
||
|
|
return filepath_abs
|
||
|
|
|
||
|
|
|
||
|
|
def sendfile(request, filename, mimetype="application/octet-stream", encoding=None):
|
||
|
|
"""
|
||
|
|
Create a response to send file using backend configured in ``SENDFILE_BACKEND``
|
||
|
|
|
||
|
|
``filename`` is the absolute path to the file to send.
|
||
|
|
"""
|
||
|
|
filepath_obj = _sanitize_path(filename)
|
||
|
|
logger.debug(
|
||
|
|
"filename '%s' requested \"\
|
||
|
|
\"-> filepath '%s' obtained",
|
||
|
|
filename,
|
||
|
|
filepath_obj,
|
||
|
|
)
|
||
|
|
_sendfile = _get_sendfile()
|
||
|
|
|
||
|
|
if not filepath_obj.exists():
|
||
|
|
raise Http404('"%s" does not exist' % filepath_obj)
|
||
|
|
|
||
|
|
response = _sendfile(request, filepath_obj, mimetype=mimetype)
|
||
|
|
|
||
|
|
response["Content-length"] = filepath_obj.stat().st_size
|
||
|
|
response["Content-Type"] = mimetype
|
||
|
|
|
||
|
|
return response
|