500 lines
18 KiB
Python
500 lines
18 KiB
Python
# 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.server 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.rest.media.v1.media_repository import MediaRepository
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from synapse.server import HomeServer
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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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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_id,
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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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media_id: str,
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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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if responder:
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await respond_with_responder(
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request,
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responder,
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file_info.thumbnail_type,
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file_info.thumbnail_length,
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)
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return
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# If we can't find the thumbnail we regenerate it. This can happen
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# if e.g. we've deleted the thumbnails but still have the original
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# image somewhere.
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#
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# Since we have an entry for the thumbnail in the DB we a) know we
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# have have successfully generated the thumbnail in the past (so we
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# don't need to worry about repeatedly failing to generate
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# thumbnails), and b) have already calculated that appropriate
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# width/height/method so we can just call the "generate exact"
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# methods.
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# First let's check that we do actually have the original image
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# still. This will throw a 404 if we don't.
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# TODO: We should refetch the thumbnails for remote media.
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await self.media_storage.ensure_media_is_in_local_cache(
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FileInfo(server_name, file_id, url_cache=url_cache)
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)
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if server_name:
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await self.media_repo.generate_remote_exact_thumbnail(
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server_name,
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file_id=file_id,
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media_id=media_id,
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t_width=file_info.thumbnail_width,
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t_height=file_info.thumbnail_height,
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t_method=file_info.thumbnail_method,
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t_type=file_info.thumbnail_type,
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)
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else:
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await self.media_repo.generate_local_exact_thumbnail(
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media_id=media_id,
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t_width=file_info.thumbnail_width,
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t_height=file_info.thumbnail_height,
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t_method=file_info.thumbnail_method,
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t_type=file_info.thumbnail_type,
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url_cache=url_cache,
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)
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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,
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responder,
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file_info.thumbnail_type,
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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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