[Standards] MUC Invites are no MUC PMs (Was: Multi-client operation and read-until-X markers)

Georg Lukas georg at op-co.de
Tue Sep 20 06:35:09 UTC 2016


Nothing is better than a corner case hidden inside of a corner case.

* Georg Lukas <georg at op-co.de> [2015-05-05 16:35]:
> 4. Carbons of MUC private messages. If user at host/A has joined to a MUC
> and receives a private message from muc at domain/participant, that message
> is carbon-copied to the other resource user at host/B (not joined to the
> MUC). Now /B has no way to know that it is a PM from a MUC, and not a
> regular message from a user muc at domain, using resource /participant, and
> is utterly confused.
> 
> One possible workaround would be to mark all MUC PMs, like it is done by
> prosody: http://hg.prosody.im/trunk/rev/09151d26560a

Both prosody and ejabberd MUC implementations now mark PMs with an
<x http://jabber.org/protocol/muc#user> element, and the respective
carbon implementations filter away duplicates, which is good.

Unfortunately, this logic also affects MUC invitations, as these also
have the same <x> element. However, invitations should be delivered to
all clients. Therefore, if you are implementing an XMPP server with
carbons support, please fix your MUC PM suppression logic.

Related: https://prosody.im/issues/issue/744


Georg
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