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Opened by Jonas Schäfer@horazont
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Messages from a MUC domain are silently dropped if they are received via carbon copy

Problem description

Messages of type "normal" and "chat" (others may apply too) which are sent from a MUC domain and delivered to Poezio via Carbons are not shown, at all. They are silently dropped. There is nothing written to errors.log.

Examples

(Note that I redacted my JIDs to be user@example/poezio and user@example/other-client. I also reformatted the XML for readability.)

Message which was shown (Directly, from MUC domain)
<message from="muc.poez.io" type="normal" to="user@example.com/poezio" id="f5bbed2d-3922-411b-be8b-c3caeb37b340-8A8E3">
  <body>Hello</body>
  <stanza-id xmlns="urn:xmpp:sid:0" by="user@example.com" id="2019-10-05-c8914a4d38e73c63" />
</message>
Message which was shown (Carbon-copied, from non-MUC domain)
<message from="user@example.com" type="normal" to="user@example.com/poezio" id="f5bbed2d-3922-411b-be8b-c3caeb37b340-8A8F4">
  <received xmlns="urn:xmpp:carbons:2">
    <forwarded xmlns="urn:xmpp:forward:0">
      <message xmlns="jabber:client" to="user@example.com/other-client" from="example.com" type="normal">
        <body>Hello</body>
        <stanza-id xmlns="urn:xmpp:sid:0" by="user@example.com" id="2019-10-05-f33935a3d2b1ac22" />
      </message>
    </forwarded>
  </received>
</message>
Message which was not shown (Carbon-copied, from MUC domain)
<message from="user@example.com" type="normal" to="user@example.com/poezio" id="f5bbed2d-3922-411b-be8b-c3caeb37b340-8A8FF">
  <received xmlns="urn:xmpp:carbons:2">
    <forwarded xmlns="urn:xmpp:forward:0">
      <message xmlns="jabber:client" to="user@example.com/other-client" from="muc.poez.io" type="normal">
        <body>Hello</body>
        <stanza-id xmlns="urn:xmpp:sid:0" by="user@example.com" id="2019-10-05-79fc69950cfa97e0" />
      </message>
    </forwarded>
  </received>
</message>

How to reproduce

You need a prosody server for this, sorry. You also need to have two clients connected to your account. Let us assume that your account is user@example.com and your clients are at user@example.com/poezio and user@example.com/something-else. Your account needs to be directly connected to your prosody.

  1. In the prosody telnet console, enter (remember that the leading > is important):

    >prosody.core_post_stanza(hosts["example.com"], require"util.stanza".message({type="normal",to="user@example.com/poezio",from="muc.poez.io"}):body("Hello"))

    Observe that the message is visible in Poezio.

  2. Next open the /xml_tab in poezio and then execute in the Prosody telnet console:

    >prosody.core_post_stanza(hosts["example.com"], require"util.stanza".message({type="normal",to="user@example.com/something-else",from="muc.poez.io"}):body("Hello"))

    Observe that the message is not shown in Poezio, despite it shows up in the /xml_tab.

  3. Try the same with a different sender:

    >prosody.core_post_stanza(hosts["example.com"], require"util.stanza".message({type="normal",to="user@example.com/something-else",from="example.com"}):body("Hello"))

    Note that this time the message is visible.

Edited by Jonas Schäfer