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Fix preview of imgur and Tenor URLs. (#11669)

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By scraping Open Graph information from the HTML even
when an autodiscovery endpoint is found. The results are
then combined to capture as much information as possible
from the page.
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Philippe Daouadi 2022-01-18 19:20:24 +01:00 • committed by GitHub
parent 9eab71aa93
commit 15ffc4143c
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7
docs/development/url_previews.md
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@ -35,7 +35,12 @@ When Synapse is asked to preview a URL it does the following:
5. 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:
3. If a JSON oEmbed URL was found in the HTML via autodiscovery:
1. Downloads the URL and stores it into a file via the media storage provider
and saves the local media metadata.
2. Convert the oEmbed response to an Open Graph response.
3. Override any Open Graph data from the HTML with data from oEmbed.
4. 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.