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# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
#
# 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 logging
import re
from typing import TYPE_CHECKING, Optional
from synapse.http.server import set_corp_headers, set_cors_headers
from synapse.http.servlet import RestServlet, parse_boolean, parse_integer
from synapse.http.site import SynapseRequest
from synapse.media._base import (
DEFAULT_MAX_TIMEOUT_MS,
MAXIMUM_ALLOWED_MAX_TIMEOUT_MS,
respond_404,
)
from synapse.util.stringutils import parse_and_validate_server_name
if TYPE_CHECKING:
from synapse.media.media_repository import MediaRepository
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class DownloadResource(RestServlet):
PATTERNS = [
re.compile(
"/_matrix/media/(r0|v3|v1)/download/(?P<server_name>[^/]*)/(?P<media_id>[^/]*)(/(?P<file_name>[^/]*))?$"
)
]
def __init__(self, hs: "HomeServer", media_repo: "MediaRepository"):
super().__init__()
self.media_repo = media_repo
self._is_mine_server_name = hs.is_mine_server_name
async def on_GET(
self,
request: SynapseRequest,
server_name: str,
media_id: str,
file_name: Optional[str] = None,
) -> None:
# Validate the server name, raising if invalid
parse_and_validate_server_name(server_name)
set_cors_headers(request)
set_corp_headers(request)
request.setHeader(
b"Content-Security-Policy",
b"sandbox;"
b" default-src 'none';"
b" script-src 'none';"
b" plugin-types application/pdf;"
b" style-src 'unsafe-inline';"
b" media-src 'self';"
b" object-src 'self';",
)
# Limited non-standard form of CSP for IE11
request.setHeader(b"X-Content-Security-Policy", b"sandbox;")
request.setHeader(b"Referrer-Policy", b"no-referrer")
max_timeout_ms = parse_integer(
request, "timeout_ms", default=DEFAULT_MAX_TIMEOUT_MS
)
max_timeout_ms = min(max_timeout_ms, MAXIMUM_ALLOWED_MAX_TIMEOUT_MS)
if self._is_mine_server_name(server_name):
await self.media_repo.get_local_media(
request, media_id, file_name, max_timeout_ms
)
else:
allow_remote = 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
await self.media_repo.get_remote_media(
request, server_name, media_id, file_name, max_timeout_ms
)
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