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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import synapse.http.servlet
from ._base import parse_media_id, respond_with_file, respond_404
from twisted.web.resource import Resource
from synapse.http.server import request_handler, set_cors_headers
from twisted.web.server import NOT_DONE_YET
from twisted.internet import defer
import logging
logger = logging.getLogger(__name__)
class DownloadResource(Resource):
isLeaf = True
def __init__(self, hs, media_repo):
Resource.__init__(self)
self.filepaths = media_repo.filepaths
self.media_repo = media_repo
self.server_name = hs.hostname
self.store = hs.get_datastore()
self.version_string = hs.version_string
self.clock = hs.get_clock()
def render_GET(self, request):
self._async_render_GET(request)
return NOT_DONE_YET
@request_handler()
@defer.inlineCallbacks
def _async_render_GET(self, request):
set_cors_headers(request)
request.setHeader(
"Content-Security-Policy",
"default-src 'none';"
" script-src 'none';"
" plugin-types application/pdf;"
" style-src 'unsafe-inline';"
" object-src 'self';"
)
server_name, media_id, name = parse_media_id(request)
if server_name == self.server_name:
yield self._respond_local_file(request, media_id, name)
else:
yield self._respond_remote_file(
request, server_name, media_id, name
)
@defer.inlineCallbacks
def _respond_local_file(self, request, media_id, name):
media_info = yield self.store.get_local_media(media_id)
if not media_info:
respond_404(request)
return
media_type = media_info["media_type"]
media_length = media_info["media_length"]
upload_name = name if name else media_info["upload_name"]
file_path = self.filepaths.local_media_filepath(media_id)
yield respond_with_file(
request, media_type, file_path, media_length,
upload_name=upload_name,
)
@defer.inlineCallbacks
def _respond_remote_file(self, request, server_name, media_id, name):
# don't forward requests for remote media if allow_remote is false
allow_remote = synapse.http.servlet.parse_boolean(
request, "allow_remote", default=True)
if not allow_remote:
logger.info(
"Rejecting request for remote media %s/%s due to allow_remote",
server_name, media_id,
)
respond_404(request)
return
media_info = yield self.media_repo.get_remote_media(server_name, media_id)
media_type = media_info["media_type"]
media_length = media_info["media_length"]
filesystem_id = media_info["filesystem_id"]
upload_name = name if name else media_info["upload_name"]
file_path = self.filepaths.remote_media_filepath(
server_name, filesystem_id
)
yield respond_with_file(
request, media_type, file_path, media_length,
upload_name=upload_name,
)
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