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Failover on proper error responses. (#14620)

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When querying a remote server handle a 404/405 with an
errcode of M_UNRECOGNIZED as an unimplemented endpoint.
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Patrick Cloke 2022-12-06 07:23:03 -05:00 committed by GitHub
parent cb59e08062
commit 9b6224577e
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2 changed files with 21 additions and 9 deletions
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1
changelog.d/14620.bugfix Normal file
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@ -0,0 +1 @@
Return spec-compliant JSON errors when unknown endpoints are requested.

29
synapse/federation/federation_client.py
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@ -771,17 +771,28 @@ class FederationClient(FederationBase):
"""
if synapse_error is None:
synapse_error = e.to_synapse_error()
# There is no good way to detect an "unknown" endpoint.
# MSC3743 specifies that servers should return a 404 or 405 with an errcode
# of M_UNRECOGNIZED when they receive a request to an unknown endpoint or
# to an unknown method, respectively.
#
# Dendrite returns a 404 (with a body of "404 page not found");
# Conduit returns a 404 (with no body); and Synapse returns a 400
# with M_UNRECOGNIZED.
#
# This needs to be rather specific as some endpoints truly do return 404
# errors.
# Older versions of servers don't properly handle this. This needs to be
# rather specific as some endpoints truly do return 404 errors.
return (
e.code == 404 and (not e.response or e.response == b"404 page not found")
) or (e.code == 400 and synapse_error.errcode == Codes.UNRECOGNIZED)
# 404 is an unknown endpoint, 405 is a known endpoint, but unknown method.
(e.code == 404 or e.code == 405)
and (
# Older Dendrites returned a text or empty body.
# Older Conduit returned an empty body.
not e.response
or e.response == b"404 page not found"
# The proper response JSON with M_UNRECOGNIZED errcode.
or synapse_error.errcode == Codes.UNRECOGNIZED
)
) or (
# Older Synapses returned a 400 error.
e.code == 400
and synapse_error.errcode == Codes.UNRECOGNIZED
)
async def _try_destination_list(
self,