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MUC mediated invitations usually have the form
<message
from='coven@chat.shakespeare.lit'
id='nzd143v8'
to='hecate@shakespeare.lit'>
<x xmlns='http://jabber.org/protocol/muc#user'>
<invite from='crone1@shakespeare.lit/desktop'>
<reason>
Hey Hecate, this is the place for all good witches!
</reason>
</invite>
<password>cauldronburn</password>
</x>
</message>
(source: XEP-0045 Example 57.)
However, previous versions of XEP-0045 specified an additional <x
xmlns='jabber❌conference'> element to be included (see
implementation note in XEP-0045). Therefore, a legacy implementation
may emit a mediated invitations in the form of
<message
from="smack-inttest-mediated-invite-from-8ta77-hw9igz@conference.example.org"
to="smack-inttest-two-8ta77@example.org">
<x xmlns="http://jabber.org/protocol/muc#user">
<invite from="smack-inttest-one-8ta77@example.org"/>
</x>
<x xmlns="jabber❌conference" jid="smack-inttest-mediated-invite-from-8ta77-hw9igz@conference.example.org"/>
</message>
Unfortunately, this matches
MultiUserChatManager.DIRECT_INVITATION_FILTER because
GroupChatInvitation matches <x xmlns="jabber❌conference"/>. However
the message is not a direct invitation but a mediated one. Besides
this invoking the wrong listeners (direct vs. medidated) the value for
'inviter' that's used to invoke that listener will be false.
To fix this, extend DIRECT_INVITATION_FILTER with
NotFilter.of(MUCUser.class) to avoid matching those legacy mediated
invitations.
Fixes SMACK-943
Co-authored-by: Florian Schmaus <flo@geekplace.eu>
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