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26b960b08b
This converts the media servlet URLs in the same way as (most) of the rest of Synapse. This will give more flexibility in the versions each endpoint exists under.
74 lines
2.7 KiB
Python
74 lines
2.7 KiB
Python
# Copyright 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 re
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from typing import TYPE_CHECKING
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from synapse.http.server import respond_with_json_bytes
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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.media_storage import MediaStorage
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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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class PreviewUrlResource(RestServlet):
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"""
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The `GET /_matrix/media/r0/preview_url` endpoint provides a generic preview API
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for URLs which outputs Open Graph (https://ogp.me/) responses (with some Matrix
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specific additions).
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This does have trade-offs compared to other designs:
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* Pros:
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* Simple and flexible; can be used by any clients at any point
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* Cons:
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* If each homeserver provides one of these independently, all the homeservers in a
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room may needlessly DoS the target URI
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* The URL metadata must be stored somewhere, rather than just using Matrix
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itself to store the media.
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* Matrix cannot be used to distribute the metadata between homeservers.
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"""
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PATTERNS = [re.compile("/_matrix/media/(r0|v3|v1)/preview_url$")]
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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.auth = hs.get_auth()
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self.clock = hs.get_clock()
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self.media_repo = media_repo
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self.media_storage = media_storage
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assert self.media_repo.url_previewer is not None
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self.url_previewer = self.media_repo.url_previewer
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async def on_GET(self, request: SynapseRequest) -> None:
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# XXX: if get_user_by_req fails, what should we do in an async render?
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requester = await self.auth.get_user_by_req(request)
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url = parse_string(request, "url", required=True)
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ts = parse_integer(request, "ts")
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if ts is None:
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ts = self.clock.time_msec()
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og = await self.url_previewer.preview(url, requester.user, ts)
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respond_with_json_bytes(request, 200, og, send_cors=True)
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