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78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
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# Copyright 2016 OpenMarket Ltd
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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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", default=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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