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574 lines
21 KiB
Python
574 lines
21 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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import re
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from typing import TYPE_CHECKING, List, Optional, Tuple
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from synapse.api.errors import Codes, SynapseError, cs_error
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from synapse.config.repository import THUMBNAIL_SUPPORTED_MEDIA_FORMAT_MAP
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from synapse.http.server import respond_with_json, set_corp_headers, set_cors_headers
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from synapse.http.servlet import RestServlet, parse_integer, parse_string
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from synapse.http.site import SynapseRequest
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from synapse.media._base import (
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DEFAULT_MAX_TIMEOUT_MS,
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MAXIMUM_ALLOWED_MAX_TIMEOUT_MS,
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FileInfo,
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ThumbnailInfo,
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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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from synapse.media.media_storage import MediaStorage
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from synapse.util.stringutils import parse_and_validate_server_name
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if TYPE_CHECKING:
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from synapse.media.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(RestServlet):
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PATTERNS = [
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re.compile(
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"/_matrix/media/(r0|v3|v1)/thumbnail/(?P<server_name>[^/]*)/(?P<media_id>[^/]*)$"
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)
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]
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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_datastores().main
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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.media.dynamic_thumbnails
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self._is_mine_server_name = hs.is_mine_server_name
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self._server_name = hs.hostname
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self.prevent_media_downloads_from = hs.config.media.prevent_media_downloads_from
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async def on_GET(
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self, request: SynapseRequest, server_name: str, media_id: str
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) -> None:
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# Validate the server name, raising if invalid
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parse_and_validate_server_name(server_name)
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set_cors_headers(request)
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set_corp_headers(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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# TODO Parse the Accept header to get an prioritised list of thumbnail types.
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m_type = "image/png"
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max_timeout_ms = parse_integer(
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request, "timeout_ms", default=DEFAULT_MAX_TIMEOUT_MS
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)
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max_timeout_ms = min(max_timeout_ms, MAXIMUM_ALLOWED_MAX_TIMEOUT_MS)
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if self._is_mine_server_name(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, max_timeout_ms
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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, max_timeout_ms
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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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# Don't let users download media from configured domains, even if it
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# is already downloaded. This is Trust & Safety tooling to make some
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# media inaccessible to local users.
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# See `prevent_media_downloads_from` config docs for more info.
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if server_name in self.prevent_media_downloads_from:
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respond_404(request)
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return
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remote_resp_function = (
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self._select_or_generate_remote_thumbnail
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if self.dynamic_thumbnails
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else self._respond_remote_thumbnail
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)
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await remote_resp_function(
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request,
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server_name,
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media_id,
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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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max_timeout_ms,
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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: SynapseRequest,
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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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max_timeout_ms: int,
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) -> None:
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media_info = await self.media_repo.get_local_media_info(
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request, media_id, max_timeout_ms
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)
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if not media_info:
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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=bool(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: SynapseRequest,
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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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max_timeout_ms: int,
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) -> None:
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media_info = await self.media_repo.get_local_media_info(
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request, media_id, max_timeout_ms
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)
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if not media_info:
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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.width == desired_width
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t_h = info.height == desired_height
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t_method = info.method == desired_method
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t_type = info.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=bool(media_info.url_cache),
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thumbnail=info,
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)
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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, responder, info.type, info.length
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)
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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=bool(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: SynapseRequest,
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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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max_timeout_ms: int,
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) -> None:
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media_info = await self.media_repo.get_remote_media_info(
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server_name, media_id, max_timeout_ms
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)
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if not media_info:
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respond_404(request)
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return
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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.width == desired_width
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t_h = info.height == desired_height
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t_method = info.method == desired_method
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t_type = info.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=file_id,
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thumbnail=info,
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)
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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, responder, info.type, info.length
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)
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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: SynapseRequest,
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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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max_timeout_ms: int,
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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(
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server_name, media_id, max_timeout_ms
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)
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if not media_info:
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return
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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=False,
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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: SynapseRequest,
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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[ThumbnailInfo],
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media_id: str,
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file_id: str,
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url_cache: bool,
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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 thumbnail info 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: True if this is from a URL cache.
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server_name: The server name, if this is a remote thumbnail.
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"""
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logger.debug(
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"_select_and_respond_with_thumbnail: media_id=%s desired=%sx%s (%s) thumbnail_infos=%s",
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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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thumbnail_infos,
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)
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# If `dynamic_thumbnails` is enabled, we expect Synapse to go down a
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# different code path to handle it.
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assert not self.dynamic_thumbnails
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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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# The thumbnail property must exist.
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assert file_info.thumbnail is not None
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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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# This might be because:
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# 1. We can't create thumbnails for the given media (corrupted or
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# unsupported file type), or
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# 2. The thumbnailing process never ran or errored out initially
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# when the media was first uploaded (these bugs should be
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# reported and fixed).
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# Note that we don't attempt to generate a thumbnail now because
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# `dynamic_thumbnails` is disabled.
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logger.info("Failed to find any generated thumbnails")
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assert request.path is not None
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respond_with_json(
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request,
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400,
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cs_error(
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"Cannot find any thumbnails for the requested media ('%s'). This might mean the media is not a supported_media_format=(%s) or that thumbnailing failed for some other reason. (Dynamic thumbnails are disabled on this server.)"
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% (
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request.path.decode(),
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", ".join(THUMBNAIL_SUPPORTED_MEDIA_FORMAT_MAP.keys()),
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),
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code=Codes.UNKNOWN,
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),
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send_cors=True,
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)
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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[ThumbnailInfo],
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file_id: str,
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url_cache: bool,
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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 thumbnail infos 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: True if this is from a URL cache.
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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: List[
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Tuple[int, int, int, bool, Optional[int], ThumbnailInfo]
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] = []
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# Other thumbnails.
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crop_info_list2: List[
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Tuple[int, int, int, bool, Optional[int], ThumbnailInfo]
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] = []
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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.method != "crop":
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continue
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t_w = info.width
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t_h = info.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.type
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length_quality = info.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,
|
|
size_quality,
|
|
type_quality,
|
|
length_quality,
|
|
info,
|
|
)
|
|
)
|
|
# Pick the most appropriate thumbnail. Some values of `desired_width` and
|
|
# `desired_height` may result in a tie, in which case we avoid comparing on
|
|
# the thumbnail info and pick the thumbnail that appears earlier
|
|
# in the list of candidates.
|
|
if crop_info_list:
|
|
thumbnail_info = min(crop_info_list, key=lambda t: t[:-1])[-1]
|
|
elif crop_info_list2:
|
|
thumbnail_info = min(crop_info_list2, key=lambda t: t[:-1])[-1]
|
|
elif desired_method == "scale":
|
|
# Thumbnails that match equal or larger sizes of desired width/height.
|
|
info_list: List[Tuple[int, bool, int, ThumbnailInfo]] = []
|
|
# Other thumbnails.
|
|
info_list2: List[Tuple[int, bool, int, ThumbnailInfo]] = []
|
|
|
|
for info in thumbnail_infos:
|
|
# Skip thumbnails generated with different methods.
|
|
if info.method != "scale":
|
|
continue
|
|
|
|
t_w = info.width
|
|
t_h = info.height
|
|
size_quality = abs((d_w - t_w) * (d_h - t_h))
|
|
type_quality = desired_type != info.type
|
|
length_quality = info.length
|
|
if t_w >= d_w or t_h >= d_h:
|
|
info_list.append((size_quality, type_quality, length_quality, info))
|
|
else:
|
|
info_list2.append(
|
|
(size_quality, type_quality, length_quality, info)
|
|
)
|
|
# Pick the most appropriate thumbnail. Some values of `desired_width` and
|
|
# `desired_height` may result in a tie, in which case we avoid comparing on
|
|
# the thumbnail info and pick the thumbnail that appears earlier
|
|
# in the list of candidates.
|
|
if info_list:
|
|
thumbnail_info = min(info_list, key=lambda t: t[:-1])[-1]
|
|
elif info_list2:
|
|
thumbnail_info = min(info_list2, key=lambda t: t[:-1])[-1]
|
|
|
|
if thumbnail_info:
|
|
return FileInfo(
|
|
file_id=file_id,
|
|
url_cache=url_cache,
|
|
server_name=server_name,
|
|
thumbnail=thumbnail_info,
|
|
)
|
|
|
|
# No matching thumbnail was found.
|
|
return None
|