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Fix invite rejection when we have no forward-extremeties (#7980)

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Thanks to some slightly overzealous cleanup in the
`delete_old_current_state_events`, it's possible to end up with no
`event_forward_extremities` in a room where we have outstanding local
invites. The user would then get a "no create event in auth events" when trying
to reject the invite.

We can hack around it by using the dangling invite as the prev event.
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Richard van der Hoff 2020-07-30 16:58:57 +01:00 committed by GitHub
parent 606805bf06
commit 0a7fb24716
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2 changed files with 22 additions and 8 deletions
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changelog.d/7980.bugfix Normal file
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@ -0,0 +1 @@
Fix "no create event in auth events" when trying to reject invitation after inviter leaves. Bug introduced in Synapse v1.10.0.

29
synapse/handlers/room_member.py
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@ -469,26 +469,39 @@ class RoomMemberHandler(object):
user_id=target.to_string(), room_id=room_id
) # type: Optional[RoomsForUser]
if not invite:
logger.info(
"%s sent a leave request to %s, but that is not an active room "
"on this server, and there is no pending invite",
target,
room_id,
)
raise SynapseError(404, "Not a known room")
logger.info(
"%s rejects invite to %s from %s", target, room_id, invite.sender
)
if self.hs.is_mine_id(invite.sender):
# the inviter was on our server, but has now left. Carry on
# with the normal rejection codepath.
#
# This is a bit of a hack, because the room might still be
# active on other servers.
pass
else:
if not self.hs.is_mine_id(invite.sender):
# send the rejection to the inviter's HS (with fallback to
# local event)
return await self.remote_reject_invite(
invite.event_id, txn_id, requester, content,
)
# the inviter was on our server, but has now left. Carry on
# with the normal rejection codepath, which will also send the
# rejection out to any other servers we believe are still in the room.
# thanks to overzealous cleaning up of event_forward_extremities in
# `delete_old_current_state_events`, it's possible to end up with no
# forward extremities here. If that happens, let's just hang the
# rejection off the invite event.
#
# see: https://github.com/matrix-org/synapse/issues/7139
if len(latest_event_ids) == 0:
latest_event_ids = [invite.event_id]
return await self._local_membership_update(
requester=requester,
target=target,