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Merge tag 'v1.43.0' into babolivier/dinsic_1.48.0
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# This file serves as a blacklist for SyTest tests that we expect will fail in | ||
# Synapse when run under worker mode. For more details, see sytest-blacklist. | ||
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Can re-join room if re-invited | ||
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# new failures as of https://github.com/matrix-org/sytest/pull/732 | ||
Device list doesn't change if remote server is down | ||
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# https://buildkite.com/matrix-dot-org/synapse/builds/6134#6f67bf47-e234-474d-80e8-c6e1868b15c5 | ||
Server correctly handles incoming m.device_list_update |
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URL Previews | ||
============ | ||
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The `GET /_matrix/media/r0/preview_url` endpoint provides a generic preview API | ||
for URLs which outputs [Open Graph](https://ogp.me/) responses (with some Matrix | ||
specific additions). | ||
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This does have trade-offs compared to other designs: | ||
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* Pros: | ||
* Simple and flexible; can be used by any clients at any point | ||
* Cons: | ||
* If each homeserver provides one of these independently, all the HSes in a | ||
room may needlessly DoS the target URI | ||
* The URL metadata must be stored somewhere, rather than just using Matrix | ||
itself to store the media. | ||
* Matrix cannot be used to distribute the metadata between homeservers. | ||
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When Synapse is asked to preview a URL it does the following: | ||
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1. Checks against a URL blacklist (defined as `url_preview_url_blacklist` in the | ||
config). | ||
2. Checks the in-memory cache by URLs and returns the result if it exists. (This | ||
is also used to de-duplicate processing of multiple in-flight requests at once.) | ||
3. Kicks off a background process to generate a preview: | ||
1. Checks the database cache by URL and timestamp and returns the result if it | ||
has not expired and was successful (a 2xx return code). | ||
2. Checks if the URL matches an oEmbed pattern. If it does, fetch the oEmbed | ||
response. If this is an image, replace the URL to fetch and continue. If | ||
if it is HTML content, use the HTML as the document and continue. | ||
3. If it doesn't match an oEmbed pattern, downloads the URL and stores it | ||
into a file via the media storage provider and saves the local media | ||
metadata. | ||
5. If the media is an image: | ||
1. Generates thumbnails. | ||
2. Generates an Open Graph response based on image properties. | ||
6. If the media is HTML: | ||
1. Decodes the HTML via the stored file. | ||
2. Generates an Open Graph response from the HTML. | ||
3. If an image exists in the Open Graph response: | ||
1. Downloads the URL and stores it into a file via the media storage | ||
provider and saves the local media metadata. | ||
2. Generates thumbnails. | ||
3. Updates the Open Graph response based on image properties. | ||
7. Stores the result in the database cache. | ||
4. Returns the result. | ||
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The in-memory cache expires after 1 hour. | ||
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Expired entries in the database cache (and their associated media files) are | ||
deleted every 10 seconds. The default expiration time is 1 hour from download. |
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