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Fetch images when previewing Twitter URLs. (#11985)

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By including "bot" in the User-Agent, which some sites use
to decide whether to include additional Open Graph information.
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AndrewRyanChama 2022-02-22 04:11:39 -08:00 • committed by GitHub
parent 79c18e0709
commit 066171643b
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3 changed files with 11 additions and 4 deletions
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synapse/rest/media/v1/preview_url_resource.py
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@ -402,7 +402,15 @@ class PreviewUrlResource(DirectServeJsonResource):
url,
output_stream=output_stream,
max_size=self.max_spider_size,
headers={"Accept-Language": self.url_preview_accept_language},
headers={
b"Accept-Language": self.url_preview_accept_language,
# Use a custom user agent for the preview because some sites will only return
# Open Graph metadata to crawler user agents. Omit the Synapse version
# string to avoid leaking information.
b"User-Agent": [
"Synapse (bot; +https://github.com/matrix-org/synapse)"
],
},
is_allowed_content_type=_is_previewable,
)
except SynapseError: