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Exclude rejected state events when calculating state at backwards extrems (#6527)
This fixes a weird bug where, if you were determined enough, you could end up with a rejected event forming part of the state at a backwards-extremity. Authing that backwards extrem would then lead to us trying to pull the rejected event from the db (with allow_rejected=False), which would fail with a 404.
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changelog.d/6527.bugfix
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changelog.d/6527.bugfix
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Fix a bug which could cause the federation server to incorrectly return errors when handling certain obscure event graphs.
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@ -605,7 +605,7 @@ class FederationHandler(BaseHandler):
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remote_event = event_map.get(event_id)
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if not remote_event:
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raise Exception("Unable to get missing prev_event %s" % (event_id,))
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if remote_event.is_state():
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if remote_event.is_state() and remote_event.rejected_reason is None:
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remote_state.append(remote_event)
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auth_chain = [event_map[e_id] for e_id in auth_event_ids if e_id in event_map]
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