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Do not break URL previews if an image is unreachable. (#12950)

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Avoid breaking a URL preview completely if the chosen image 404s
or is unreachable for some other reason (e.g. DNS).
This commit is contained in:
Patrick Cloke 2022-06-06 07:46:04 -04:00 • committed by GitHub
parent 1acc897c31
commit 148fe58a24
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3 changed files with 53 additions and 6 deletions
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35
tests/rest/media/v1/test_url_preview.py
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@ -656,6 +656,41 @@ class URLPreviewTests(unittest.HomeserverTestCase):
server.data,
)
def test_nonexistent_image(self) -> None:
"""If the preview image doesn't exist, ensure some data is returned."""
self.lookups["matrix.org"] = [(IPv4Address, "10.1.2.3")]
end_content = (
b"""<html><body><img src="http://cdn.matrix.org/foo.jpg"></body></html>"""
)
channel = self.make_request(
"GET",
"preview_url?url=http://matrix.org",
shorthand=False,
await_result=False,
)
self.pump()
client = self.reactor.tcpClients[0][2].buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, self.reactor))
client.makeConnection(FakeTransport(server, self.reactor))
client.dataReceived(
(
b"HTTP/1.0 200 OK\r\nContent-Length: %d\r\n"
b'Content-Type: text/html; charset="utf8"\r\n\r\n'
)
% (len(end_content),)
+ end_content
)
self.pump()
self.assertEqual(channel.code, 200)
# The image should not be in the result.
self.assertNotIn("og:image", channel.json_body)
def test_data_url(self) -> None:
"""
Requesting to preview a data URL is not supported.