mirror of
https://github.com/moparisthebest/xeps
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173 lines
7.1 KiB
XML
173 lines
7.1 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM 'xep.ent'>
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>MUC Mention Notifications</title>
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<abstract>This specification documents how a user may be informed when they're mentioned in a MUC which they're not currently joined to.</abstract>
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&LEGALNOTICE;
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<number>0452</number>
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<status>Experimental</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0001</spec>
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<spec>Etc.</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>NOT_YET_ASSIGNED</shortname>
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&jcbrand;
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<author>
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<firstname>Severino</firstname>
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<surname>Ferrer de la Peñita</surname>
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<email>soul@blastersklan.com</email>
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<jid>soul@blastersklan.com</jid>
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</author>
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&mwild;
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<revision>
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<version>0.2.1</version>
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<date>2021-02-12</date>
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<initials>ps</initials>
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<remark>Fix reference to XEP-0297: Stanza Forwarding</remark>
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</revision>
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<revision>
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<version>0.2.0</version>
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<date>2021-02-09</date>
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<initials>jcb</initials>
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<remark>Require nickname registration for notifications to work</remark>
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</revision>
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<revision>
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<version>0.1.0</version>
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<date>2021-01-26</date>
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<initials>XEP Editor (jsc)</initials>
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<remark>Accepted by vote of Council on 2021-01-06.</remark>
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</revision>
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<revision>
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<version>0.0.1</version>
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<date>2020-12-17</date>
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<initials>jcb</initials>
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<remark><p>First draft.</p></remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<p>The &xep0045; specification does not provide for a mechanism whereby an user might be informed of being mentioned in a Multi-User Chat (MUC) without being present as an occupant of that MUC.</p>
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<p>This XEP aims to provide a standardized way in which this might be achieved.</p>
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<p>Concerning "being mentioned" in a MUC, we will rely on &xep0372; as the means whereby someone is explicitly mentioned in a MUC message.</p>
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</section1>
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<section1 topic='Requirements' anchor='reqs'>
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<p>A user's client must be able to receive forwarded groupchat messages from a MUC in which that user is mentioned, while not having an active session in that MUC (i.e. without joining it).</p>
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<p>For this to be possible, the MUC needs to know the user's JID and MUC nickname even when that user is not currently present in the MUC. &xep0045; section 7.10 ("Registering with a Room") describes a mechanism whereby a user can register a nickname with a MUC and it is recommended that this is the mechanism used to keep track of users across sessions.</p>
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<p>Whether or not mesages are forwarded will be determined by a configuration setting on the MUC.</p>
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<p>The MUC owner(s) will therefore determine whether notifications are sent out, and if activated, users may opt in or out (or have that done for them by a privileged user) by having their nicknames registered or not with the MUC.</p>
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</section1>
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<section1 topic='Use Cases' anchor='usecases'>
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<section2 topic='A MUC is configured to send out mention notifications'>
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<p>When an owner creates or configures a MUC, the service offers the option to send out mention notifications to non-present, but still affiliated users:</p>
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<example caption='Service Sends Configuration Form'><![CDATA[
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<iq from='coven@chat.shakespeare.lit'
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id='create1'
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to='crone1@shakespeare.lit/desktop'
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type='result'>
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<query xmlns='http://jabber.org/protocol/muc#owner'>
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<x xmlns='jabber:x:data' type='form'>
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<field type='hidden' var='FORM_TYPE'>
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<value>http://jabber.org/protocol/muc#roomconfig</value>
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</field>
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...
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<field
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label='Forward messages with mentions to non-present, affiiated users'
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type='boolean'
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var='muc#roomconfig_forwardmentions'>
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<value>0</value>
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</field>
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...
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</x>
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</query>
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</iq>
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]]></example>
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<p>The owner specifies a value of "1" or "true" &BOOLEANNOTE; if the feature is desired:</p>
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<example caption='MUC Owner Submits Configuration Form'><![CDATA[
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<iq from='coven@chat.shakespeare.lit'
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id='configure1'
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to='crone1@shakespeare.lit/desktop'
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type='set'>
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<query xmlns='http://jabber.org/protocol/muc#owner'>
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<x xmlns='jabber:x:data' type='submit'>
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<field type='hidden' var='FORM_TYPE'>
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<value>http://jabber.org/protocol/muc#roomconfig</value>
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</field>
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...
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<field var='muc#roomconfig_forwardmentions'>
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<value>true</value>
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</field>
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...
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</x>
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</query>
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</iq>
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]]></example>
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<p></p>
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</section2>
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<section2 topic='Notifying a non-present user of being mentioned in a MUC'>
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<p>When an affiliated user in a given MUC is referenced in a 'groupchat' message via &xep0372;, and the MUC is configured to forward mentions, then the MUC will forward the message stanza to the user.</p>
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<example caption='MUC forwards the message to the users client'><![CDATA[
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<message to='hag66@shakespeare.lit' from='coven@chat.shakespeare.lit'>
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<mentions xmlns='urn:xmpp:mmn:0'>
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<forwarded xmlns='urn:xmpp:forward:0'>
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<delay xmlns='urn:xmpp:delay' stamp='2020-12-03T14:45:56Z'/>
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<message type='groupchat' id='ad22c55c-5a20-4185-8735-af2eb8d459a9'
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to='coven@chat.shakespeare.lit'
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from='coven@chat.shakespeare.lit/firstwitch'
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xml:lang='en'>
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<body>secondwitch: Thrice the brinded cat hath mew'd.</body>
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<reference xmlns='urn:xmpp:reference:0'
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type='mention'
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begin='0'
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uri='xmpp:hag66@shakespeare.lit'
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end='11'/>
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<stanza-id xmlns='urn:xmpp:sid:0'
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id='5f3dbc5e-e1d3-4077-a492-693f3769c7ad'
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by='coven@chat.shakespeare.lit'/>
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</message>
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</forwarded>
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</mentions>
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</message>
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]]></example>
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<p>Notice that in the example above, the entire original 'groupchat' message (including elements added server-side, like the &xep0359; stanza-id) is encapsulated inside a &xep0297; element.</p>
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</section2>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>Similarly to &xep0280;, the security model assumed by this document is that all of the resources for a single user are in the same trust boundary.</p>
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<p>Forwarded groupchat messages leak information of who is currently present in a MUC without requiring the user to join the MUC first to find out.</p>
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<ul>
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<li>Any forwarded copies received by a client MUST be from a valid MUC JID which matches the MUC JID of the encapsulated, forwarded mesages;</li>
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<li>any copies that do not meet this requirement MUST be ignored.</li>
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</ul>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>None.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<section2 topic='Protocol Namespaces' anchor='ns'>
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<p>The ®ISTRAR; includes 'urn:xmpp:mmn:0' in its registry of protocol namespaces (see &NAMESPACES;).</p>
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<ul>
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<li>urn:xmpp:mmn:0</li>
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</ul>
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</section2>
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<section2 topic='Protocol Versioning' anchor='registrar-versioning'>
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&NSVER;
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</section2>
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</section1>
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</xep>
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