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https://mau.dev/maunium/synapse.git
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a7882f9887
If no thumbnail of the requested type exists, return a 404 instead of erroring. This doesn't quite match the spec (which does not define what happens if no thumbnail can be found), but is consistent with what Synapse already does.
447 lines
16 KiB
Python
447 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from typing import TYPE_CHECKING, Any, Dict, List, Optional
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from twisted.web.http import Request
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from synapse.api.errors import SynapseError
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from synapse.http.server import DirectServeJsonResource, set_cors_headers
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from synapse.http.servlet import parse_integer, parse_string
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from synapse.rest.media.v1.media_storage import MediaStorage
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from ._base import (
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FileInfo,
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parse_media_id,
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respond_404,
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respond_with_file,
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respond_with_responder,
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)
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if TYPE_CHECKING:
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from synapse.app.homeserver import HomeServer
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from synapse.rest.media.v1.media_repository import MediaRepository
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logger = logging.getLogger(__name__)
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class ThumbnailResource(DirectServeJsonResource):
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isLeaf = True
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def __init__(
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self,
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hs: "HomeServer",
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media_repo: "MediaRepository",
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media_storage: MediaStorage,
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):
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super().__init__()
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self.store = hs.get_datastore()
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self.media_repo = media_repo
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self.media_storage = media_storage
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self.dynamic_thumbnails = hs.config.dynamic_thumbnails
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self.server_name = hs.hostname
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async def _async_render_GET(self, request: Request) -> None:
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set_cors_headers(request)
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server_name, media_id, _ = parse_media_id(request)
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width = parse_integer(request, "width", required=True)
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height = parse_integer(request, "height", required=True)
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method = parse_string(request, "method", "scale")
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m_type = parse_string(request, "type", "image/png")
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if server_name == self.server_name:
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if self.dynamic_thumbnails:
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await self._select_or_generate_local_thumbnail(
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request, media_id, width, height, method, m_type
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)
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else:
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await self._respond_local_thumbnail(
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request, media_id, width, height, method, m_type
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)
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self.media_repo.mark_recently_accessed(None, media_id)
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else:
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if self.dynamic_thumbnails:
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await self._select_or_generate_remote_thumbnail(
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request, server_name, media_id, width, height, method, m_type
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)
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else:
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await self._respond_remote_thumbnail(
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request, server_name, media_id, width, height, method, m_type
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)
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self.media_repo.mark_recently_accessed(server_name, media_id)
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async def _respond_local_thumbnail(
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self,
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request: Request,
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media_id: str,
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width: int,
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height: int,
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method: str,
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m_type: str,
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) -> None:
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media_info = await self.store.get_local_media(media_id)
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if not media_info:
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respond_404(request)
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return
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if media_info["quarantined_by"]:
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logger.info("Media is quarantined")
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respond_404(request)
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return
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thumbnail_infos = await self.store.get_local_media_thumbnails(media_id)
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await self._select_and_respond_with_thumbnail(
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request,
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width,
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height,
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method,
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m_type,
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thumbnail_infos,
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media_id,
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url_cache=media_info["url_cache"],
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server_name=None,
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)
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async def _select_or_generate_local_thumbnail(
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self,
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request: Request,
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media_id: str,
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desired_width: int,
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desired_height: int,
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desired_method: str,
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desired_type: str,
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) -> None:
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media_info = await self.store.get_local_media(media_id)
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if not media_info:
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respond_404(request)
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return
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if media_info["quarantined_by"]:
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logger.info("Media is quarantined")
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respond_404(request)
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return
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thumbnail_infos = await self.store.get_local_media_thumbnails(media_id)
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for info in thumbnail_infos:
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t_w = info["thumbnail_width"] == desired_width
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t_h = info["thumbnail_height"] == desired_height
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t_method = info["thumbnail_method"] == desired_method
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t_type = info["thumbnail_type"] == desired_type
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if t_w and t_h and t_method and t_type:
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file_info = FileInfo(
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server_name=None,
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file_id=media_id,
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url_cache=media_info["url_cache"],
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thumbnail=True,
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thumbnail_width=info["thumbnail_width"],
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thumbnail_height=info["thumbnail_height"],
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thumbnail_type=info["thumbnail_type"],
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thumbnail_method=info["thumbnail_method"],
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)
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t_type = file_info.thumbnail_type
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t_length = info["thumbnail_length"]
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responder = await self.media_storage.fetch_media(file_info)
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if responder:
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await respond_with_responder(request, responder, t_type, t_length)
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return
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logger.debug("We don't have a thumbnail of that size. Generating")
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# Okay, so we generate one.
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file_path = await self.media_repo.generate_local_exact_thumbnail(
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media_id,
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desired_width,
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desired_height,
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desired_method,
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desired_type,
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url_cache=media_info["url_cache"],
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)
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if file_path:
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await respond_with_file(request, desired_type, file_path)
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else:
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logger.warning("Failed to generate thumbnail")
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raise SynapseError(400, "Failed to generate thumbnail.")
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async def _select_or_generate_remote_thumbnail(
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self,
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request: Request,
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server_name: str,
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media_id: str,
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desired_width: int,
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desired_height: int,
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desired_method: str,
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desired_type: str,
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) -> None:
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media_info = await self.media_repo.get_remote_media_info(server_name, media_id)
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thumbnail_infos = await self.store.get_remote_media_thumbnails(
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server_name, media_id
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)
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file_id = media_info["filesystem_id"]
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for info in thumbnail_infos:
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t_w = info["thumbnail_width"] == desired_width
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t_h = info["thumbnail_height"] == desired_height
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t_method = info["thumbnail_method"] == desired_method
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t_type = info["thumbnail_type"] == desired_type
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if t_w and t_h and t_method and t_type:
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file_info = FileInfo(
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server_name=server_name,
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file_id=media_info["filesystem_id"],
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thumbnail=True,
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thumbnail_width=info["thumbnail_width"],
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thumbnail_height=info["thumbnail_height"],
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thumbnail_type=info["thumbnail_type"],
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thumbnail_method=info["thumbnail_method"],
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)
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t_type = file_info.thumbnail_type
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t_length = info["thumbnail_length"]
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responder = await self.media_storage.fetch_media(file_info)
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if responder:
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await respond_with_responder(request, responder, t_type, t_length)
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return
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logger.debug("We don't have a thumbnail of that size. Generating")
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# Okay, so we generate one.
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file_path = await self.media_repo.generate_remote_exact_thumbnail(
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server_name,
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file_id,
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media_id,
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desired_width,
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desired_height,
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desired_method,
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desired_type,
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)
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if file_path:
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await respond_with_file(request, desired_type, file_path)
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else:
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logger.warning("Failed to generate thumbnail")
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raise SynapseError(400, "Failed to generate thumbnail.")
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async def _respond_remote_thumbnail(
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self,
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request: Request,
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server_name: str,
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media_id: str,
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width: int,
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height: int,
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method: str,
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m_type: str,
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) -> None:
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# TODO: Don't download the whole remote file
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# We should proxy the thumbnail from the remote server instead of
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# downloading the remote file and generating our own thumbnails.
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media_info = await self.media_repo.get_remote_media_info(server_name, media_id)
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thumbnail_infos = await self.store.get_remote_media_thumbnails(
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server_name, media_id
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)
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await self._select_and_respond_with_thumbnail(
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request,
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width,
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height,
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method,
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m_type,
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thumbnail_infos,
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media_info["filesystem_id"],
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url_cache=None,
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server_name=server_name,
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)
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async def _select_and_respond_with_thumbnail(
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self,
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request: Request,
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desired_width: int,
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desired_height: int,
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desired_method: str,
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desired_type: str,
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thumbnail_infos: List[Dict[str, Any]],
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file_id: str,
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url_cache: Optional[str] = None,
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server_name: Optional[str] = None,
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) -> None:
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"""
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Respond to a request with an appropriate thumbnail from the previously generated thumbnails.
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Args:
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request: The incoming request.
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desired_width: The desired width, the returned thumbnail may be larger than this.
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desired_height: The desired height, the returned thumbnail may be larger than this.
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desired_method: The desired method used to generate the thumbnail.
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desired_type: The desired content-type of the thumbnail.
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thumbnail_infos: A list of dictionaries of candidate thumbnails.
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file_id: The ID of the media that a thumbnail is being requested for.
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url_cache: The URL cache value.
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server_name: The server name, if this is a remote thumbnail.
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"""
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if thumbnail_infos:
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file_info = self._select_thumbnail(
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desired_width,
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desired_height,
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desired_method,
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desired_type,
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thumbnail_infos,
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file_id,
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url_cache,
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server_name,
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)
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if not file_info:
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logger.info("Couldn't find a thumbnail matching the desired inputs")
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respond_404(request)
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return
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responder = await self.media_storage.fetch_media(file_info)
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await respond_with_responder(
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request, responder, file_info.thumbnail_type, file_info.thumbnail_length
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)
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else:
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logger.info("Failed to find any generated thumbnails")
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respond_404(request)
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def _select_thumbnail(
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self,
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desired_width: int,
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desired_height: int,
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desired_method: str,
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desired_type: str,
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thumbnail_infos: List[Dict[str, Any]],
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file_id: str,
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url_cache: Optional[str],
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server_name: Optional[str],
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) -> Optional[FileInfo]:
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"""
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Choose an appropriate thumbnail from the previously generated thumbnails.
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Args:
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desired_width: The desired width, the returned thumbnail may be larger than this.
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desired_height: The desired height, the returned thumbnail may be larger than this.
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desired_method: The desired method used to generate the thumbnail.
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desired_type: The desired content-type of the thumbnail.
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thumbnail_infos: A list of dictionaries of candidate thumbnails.
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file_id: The ID of the media that a thumbnail is being requested for.
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url_cache: The URL cache value.
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server_name: The server name, if this is a remote thumbnail.
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Returns:
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The thumbnail which best matches the desired parameters.
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"""
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desired_method = desired_method.lower()
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# The chosen thumbnail.
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thumbnail_info = None
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d_w = desired_width
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d_h = desired_height
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if desired_method == "crop":
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# Thumbnails that match equal or larger sizes of desired width/height.
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crop_info_list = []
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# Other thumbnails.
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crop_info_list2 = []
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for info in thumbnail_infos:
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# Skip thumbnails generated with different methods.
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if info["thumbnail_method"] != "crop":
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continue
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t_w = info["thumbnail_width"]
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t_h = info["thumbnail_height"]
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aspect_quality = abs(d_w * t_h - d_h * t_w)
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min_quality = 0 if d_w <= t_w and d_h <= t_h else 1
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size_quality = abs((d_w - t_w) * (d_h - t_h))
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type_quality = desired_type != info["thumbnail_type"]
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length_quality = info["thumbnail_length"]
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if t_w >= d_w or t_h >= d_h:
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crop_info_list.append(
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(
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aspect_quality,
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min_quality,
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size_quality,
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type_quality,
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length_quality,
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info,
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)
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)
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else:
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crop_info_list2.append(
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(
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aspect_quality,
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min_quality,
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size_quality,
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type_quality,
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length_quality,
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info,
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)
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)
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if crop_info_list:
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thumbnail_info = min(crop_info_list)[-1]
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elif crop_info_list2:
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thumbnail_info = min(crop_info_list2)[-1]
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elif desired_method == "scale":
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# Thumbnails that match equal or larger sizes of desired width/height.
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info_list = []
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# Other thumbnails.
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info_list2 = []
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for info in thumbnail_infos:
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# Skip thumbnails generated with different methods.
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if info["thumbnail_method"] != "scale":
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continue
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t_w = info["thumbnail_width"]
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t_h = info["thumbnail_height"]
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size_quality = abs((d_w - t_w) * (d_h - t_h))
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type_quality = desired_type != info["thumbnail_type"]
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length_quality = info["thumbnail_length"]
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if t_w >= d_w or t_h >= d_h:
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info_list.append((size_quality, type_quality, length_quality, info))
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else:
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info_list2.append(
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(size_quality, type_quality, length_quality, info)
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)
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if info_list:
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thumbnail_info = min(info_list)[-1]
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elif info_list2:
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thumbnail_info = min(info_list2)[-1]
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if thumbnail_info:
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return FileInfo(
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file_id=file_id,
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url_cache=url_cache,
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server_name=server_name,
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thumbnail=True,
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thumbnail_width=thumbnail_info["thumbnail_width"],
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thumbnail_height=thumbnail_info["thumbnail_height"],
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thumbnail_type=thumbnail_info["thumbnail_type"],
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thumbnail_method=thumbnail_info["thumbnail_method"],
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thumbnail_length=thumbnail_info["thumbnail_length"],
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)
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# No matching thumbnail was found.
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return None
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