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# -*- coding: utf-8 -*-
# Copyright 2014 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.
from synapse.http.server import respond_with_json
from synapse.util.stringutils import random_string
from synapse.api.errors import (
cs_exception, CodeMessageException, cs_error, Codes
)
from twisted.protocols.basic import FileSender
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from twisted.internet import defer
import os
import logging
logger = logging.getLogger(__name__)
class DownloadResource(Resource):
isLeaf = True
def __init__(self, hs, filepaths):
Resource.__init__(self)
self.client = hs.get_http_client()
self.clock = hs.get_clock()
self.server_name = hs.hostname
self.store = hs.get_datastore()
self.filepaths = filepaths
def render_GET(self, request):
self._async_render_GET(request)
return NOT_DONE_YET
def _respond_404(self, request):
respond_with_json(
request, 404,
cs_error(
"Not found %r" % (request.postpath,),
code=Codes.NOT_FOUND,
),
send_cors=True
)
@defer.inlineCallbacks
def _async_render_GET(self, request):
try:
server_name, media_id = request.postpath
except:
self._respond_404(request)
return
try:
if server_name == self.server_name:
yield self._respond_local_file(request, media_id)
else:
yield self._respond_remote_file(request, server_name, media_id)
except CodeMessageException as e:
logger.exception(e)
respond_with_json(request, e.code, cs_exception(e), send_cors=True)
except:
logger.exception("Failed to serve file")
respond_with_json(
request,
500,
{"error": "Internal server error"},
send_cors=True
)
@defer.inlineCallbacks
def _download_remote_file(self, server_name, media_id):
filesystem_id = random_string(24)
fname = self.filepaths.remote_media_filepath(
server_name, filesystem_id
)
os.makedirs(os.path.dirname(fname))
try:
with open(fname, "wb") as f:
length, headers = yield self.client.get_file(
server_name,
"/".join((
"/_matrix/media/v1/download", server_name, media_id,
)),
output_stream=f,
)
except:
os.remove(fname)
raise
media_type = headers["Content-Type"][0]
time_now_ms = self.clock.time_msec()
yield self.store.store_cached_remote_media(
origin=server_name,
media_id=media_id,
media_type=media_type,
time_now_ms=self.clock.time_msec(),
upload_name=None,
media_length=length,
filesystem_id=filesystem_id,
)
defer.returnValue({
"media_type": media_type,
"media_length": length,
"upload_name": None,
"created_ts": time_now_ms,
"filesystem_id": filesystem_id,
})
@defer.inlineCallbacks
def _respond_remote_file(self, request, server_name, media_id):
media_info = yield self.store.get_cached_remote_media(
server_name, media_id
)
if not media_info:
media_info = yield self._download_remote_file(
server_name, media_id
)
filesystem_id = media_info["filesystem_id"]
file_path = self.filepaths.remote_media_filepath(
server_name, filesystem_id
)
if os.path.isfile(file_path):
media_type = media_info["media_type"]
request.setHeader(b"Content-Type", media_type.encode("UTF-8"))
# cache for at least a day.
# XXX: we might want to turn this off for data we don't want to
# recommend caching as it's sensitive or private - or at least
# select private. don't bother setting Expires as all our
# clients are smart enough to be happy with Cache-Control
request.setHeader(
b"Cache-Control", b"public,max-age=86400,s-maxage=86400"
)
with open(file_path, "rb") as f:
yield FileSender().beginFileTransfer(f, request)
request.finish()
else:
self._respond_404()
@defer.inlineCallbacks
def _respond_local_file(self, request, media_id):
media_info = yield self.store.get_local_media(media_id)
if not media_info:
self._respond_404()
return
file_path = self.filepaths.local_media_filepath(media_id)
logger.debug("Searching for %s", file_path)
if os.path.isfile(file_path):
media_type = media_info["media_type"]
request.setHeader(b"Content-Type", media_type.encode("UTF-8"))
# cache for at least a day.
# XXX: we might want to turn this off for data we don't want to
# recommend caching as it's sensitive or private - or at least
# select private. don't bother setting Expires as all our
# clients are smart enough to be happy with Cache-Control
request.setHeader(
b"Cache-Control", b"public,max-age=86400,s-maxage=86400"
)
with open(file_path, "rb") as f:
yield FileSender().beginFileTransfer(f, request)
request.finish()
else:
self._respond_404()
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