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Return a 404 rather than a 500 on rejoining empty rooms
Filter ourselves out of the server list before checking for an empty remote host list, to fix 500 error Fixes #2141
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@ -852,6 +852,14 @@ class RoomMemberMasterHandler(RoomMemberHandler):
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def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
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"""Implements RoomMemberHandler._remote_join
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"""
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# filter ourselves out of remote_room_hosts: do_invite_join ignores it
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# and if it is the only entry we'd like to return a 404 rather than a
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# 500.
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remote_room_hosts = [
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host for host in remote_room_hosts if host != self.hs.hostname
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]
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if len(remote_room_hosts) == 0:
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raise SynapseError(404, "No known servers")
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