anonymousland-synapse/synapse/rest/media/v1/thumbnail_resource.py
Patrick Cloke b312769c0e
Do not error when thumbnailing invalid files (#8236)
If a file cannot be thumbnailed for some reason (e.g. the file is empty), then
catch the exception and convert it to a reasonable error message for the client.
2020-09-09 12:59:41 -04:00

346 lines
13 KiB
Python

# -*- 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 logging
from synapse.api.errors import SynapseError
from synapse.http.server import DirectServeJsonResource, set_cors_headers
from synapse.http.servlet import parse_integer, parse_string
from ._base import (
FileInfo,
parse_media_id,
respond_404,
respond_with_file,
respond_with_responder,
)
logger = logging.getLogger(__name__)
class ThumbnailResource(DirectServeJsonResource):
isLeaf = True
def __init__(self, hs, media_repo, media_storage):
super().__init__()
self.store = hs.get_datastore()
self.media_repo = media_repo
self.media_storage = media_storage
self.dynamic_thumbnails = hs.config.dynamic_thumbnails
self.server_name = hs.hostname
async def _async_render_GET(self, request):
set_cors_headers(request)
server_name, media_id, _ = parse_media_id(request)
width = parse_integer(request, "width", required=True)
height = parse_integer(request, "height", required=True)
method = parse_string(request, "method", "scale")
m_type = parse_string(request, "type", "image/png")
if server_name == self.server_name:
if self.dynamic_thumbnails:
await self._select_or_generate_local_thumbnail(
request, media_id, width, height, method, m_type
)
else:
await self._respond_local_thumbnail(
request, media_id, width, height, method, m_type
)
self.media_repo.mark_recently_accessed(None, media_id)
else:
if self.dynamic_thumbnails:
await self._select_or_generate_remote_thumbnail(
request, server_name, media_id, width, height, method, m_type
)
else:
await self._respond_remote_thumbnail(
request, server_name, media_id, width, height, method, m_type
)
self.media_repo.mark_recently_accessed(server_name, media_id)
async def _respond_local_thumbnail(
self, request, media_id, width, height, method, m_type
):
media_info = await self.store.get_local_media(media_id)
if not media_info:
respond_404(request)
return
if media_info["quarantined_by"]:
logger.info("Media is quarantined")
respond_404(request)
return
thumbnail_infos = await self.store.get_local_media_thumbnails(media_id)
if thumbnail_infos:
thumbnail_info = self._select_thumbnail(
width, height, method, m_type, thumbnail_infos
)
file_info = FileInfo(
server_name=None,
file_id=media_id,
url_cache=media_info["url_cache"],
thumbnail=True,
thumbnail_width=thumbnail_info["thumbnail_width"],
thumbnail_height=thumbnail_info["thumbnail_height"],
thumbnail_type=thumbnail_info["thumbnail_type"],
thumbnail_method=thumbnail_info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = thumbnail_info["thumbnail_length"]
responder = await self.media_storage.fetch_media(file_info)
await respond_with_responder(request, responder, t_type, t_length)
else:
logger.info("Couldn't find any generated thumbnails")
respond_404(request)
async def _select_or_generate_local_thumbnail(
self,
request,
media_id,
desired_width,
desired_height,
desired_method,
desired_type,
):
media_info = await self.store.get_local_media(media_id)
if not media_info:
respond_404(request)
return
if media_info["quarantined_by"]:
logger.info("Media is quarantined")
respond_404(request)
return
thumbnail_infos = await self.store.get_local_media_thumbnails(media_id)
for info in thumbnail_infos:
t_w = info["thumbnail_width"] == desired_width
t_h = info["thumbnail_height"] == desired_height
t_method = info["thumbnail_method"] == desired_method
t_type = info["thumbnail_type"] == desired_type
if t_w and t_h and t_method and t_type:
file_info = FileInfo(
server_name=None,
file_id=media_id,
url_cache=media_info["url_cache"],
thumbnail=True,
thumbnail_width=info["thumbnail_width"],
thumbnail_height=info["thumbnail_height"],
thumbnail_type=info["thumbnail_type"],
thumbnail_method=info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = info["thumbnail_length"]
responder = await self.media_storage.fetch_media(file_info)
if responder:
await respond_with_responder(request, responder, t_type, t_length)
return
logger.debug("We don't have a thumbnail of that size. Generating")
# Okay, so we generate one.
file_path = await self.media_repo.generate_local_exact_thumbnail(
media_id,
desired_width,
desired_height,
desired_method,
desired_type,
url_cache=media_info["url_cache"],
)
if file_path:
await respond_with_file(request, desired_type, file_path)
else:
logger.warning("Failed to generate thumbnail")
raise SynapseError(400, "Failed to generate thumbnail.")
async def _select_or_generate_remote_thumbnail(
self,
request,
server_name,
media_id,
desired_width,
desired_height,
desired_method,
desired_type,
):
media_info = await self.media_repo.get_remote_media_info(server_name, media_id)
thumbnail_infos = await self.store.get_remote_media_thumbnails(
server_name, media_id
)
file_id = media_info["filesystem_id"]
for info in thumbnail_infos:
t_w = info["thumbnail_width"] == desired_width
t_h = info["thumbnail_height"] == desired_height
t_method = info["thumbnail_method"] == desired_method
t_type = info["thumbnail_type"] == desired_type
if t_w and t_h and t_method and t_type:
file_info = FileInfo(
server_name=server_name,
file_id=media_info["filesystem_id"],
thumbnail=True,
thumbnail_width=info["thumbnail_width"],
thumbnail_height=info["thumbnail_height"],
thumbnail_type=info["thumbnail_type"],
thumbnail_method=info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = info["thumbnail_length"]
responder = await self.media_storage.fetch_media(file_info)
if responder:
await respond_with_responder(request, responder, t_type, t_length)
return
logger.debug("We don't have a thumbnail of that size. Generating")
# Okay, so we generate one.
file_path = await self.media_repo.generate_remote_exact_thumbnail(
server_name,
file_id,
media_id,
desired_width,
desired_height,
desired_method,
desired_type,
)
if file_path:
await respond_with_file(request, desired_type, file_path)
else:
logger.warning("Failed to generate thumbnail")
raise SynapseError(400, "Failed to generate thumbnail.")
async def _respond_remote_thumbnail(
self, request, server_name, media_id, width, height, method, m_type
):
# TODO: Don't download the whole remote file
# We should proxy the thumbnail from the remote server instead of
# downloading the remote file and generating our own thumbnails.
media_info = await self.media_repo.get_remote_media_info(server_name, media_id)
thumbnail_infos = await self.store.get_remote_media_thumbnails(
server_name, media_id
)
if thumbnail_infos:
thumbnail_info = self._select_thumbnail(
width, height, method, m_type, thumbnail_infos
)
file_info = FileInfo(
server_name=server_name,
file_id=media_info["filesystem_id"],
thumbnail=True,
thumbnail_width=thumbnail_info["thumbnail_width"],
thumbnail_height=thumbnail_info["thumbnail_height"],
thumbnail_type=thumbnail_info["thumbnail_type"],
thumbnail_method=thumbnail_info["thumbnail_method"],
)
t_type = file_info.thumbnail_type
t_length = thumbnail_info["thumbnail_length"]
responder = await self.media_storage.fetch_media(file_info)
await respond_with_responder(request, responder, t_type, t_length)
else:
logger.info("Failed to find any generated thumbnails")
respond_404(request)
def _select_thumbnail(
self,
desired_width,
desired_height,
desired_method,
desired_type,
thumbnail_infos,
):
d_w = desired_width
d_h = desired_height
if desired_method.lower() == "crop":
crop_info_list = []
crop_info_list2 = []
for info in thumbnail_infos:
t_w = info["thumbnail_width"]
t_h = info["thumbnail_height"]
t_method = info["thumbnail_method"]
if t_method == "crop":
aspect_quality = abs(d_w * t_h - d_h * t_w)
min_quality = 0 if d_w <= t_w and d_h <= t_h else 1
size_quality = abs((d_w - t_w) * (d_h - t_h))
type_quality = desired_type != info["thumbnail_type"]
length_quality = info["thumbnail_length"]
if t_w >= d_w or t_h >= d_h:
crop_info_list.append(
(
aspect_quality,
min_quality,
size_quality,
type_quality,
length_quality,
info,
)
)
else:
crop_info_list2.append(
(
aspect_quality,
min_quality,
size_quality,
type_quality,
length_quality,
info,
)
)
if crop_info_list:
return min(crop_info_list)[-1]
else:
return min(crop_info_list2)[-1]
else:
info_list = []
info_list2 = []
for info in thumbnail_infos:
t_w = info["thumbnail_width"]
t_h = info["thumbnail_height"]
t_method = info["thumbnail_method"]
size_quality = abs((d_w - t_w) * (d_h - t_h))
type_quality = desired_type != info["thumbnail_type"]
length_quality = info["thumbnail_length"]
if t_method == "scale" and (t_w >= d_w or t_h >= d_h):
info_list.append((size_quality, type_quality, length_quality, info))
elif t_method == "scale":
info_list2.append(
(size_quality, type_quality, length_quality, info)
)
if info_list:
return min(info_list)[-1]
else:
return min(info_list2)[-1]