mirror of
https://github.com/moparisthebest/xeps
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118 lines
4.7 KiB
XML
118 lines
4.7 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>Unique Room Names for Multi-User Chat</title>
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<abstract>This specification defines an XMPP protocol extension for requesting a unique room ID from a multi-user chat service.</abstract>
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&LEGALNOTICE;
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<number>0307</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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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0045</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>muc-unique</shortname>
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<schemaloc>
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<url>http://www.xmpp.org/schemas/muc-unique.xsd</url>
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</schemaloc>
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&stpeter;
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<revision>
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<version>0.1</version>
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<date>2011-11-10</date>
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<initials>psa</initials>
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<remark><p>Initial published version.</p></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>2011-09-26</date>
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<initials>psa</initials>
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<remark><p>First version, moved from XEP-0045.</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>&xep0045; defines the protocol for groupchat in XMPP. In some situations, the room creator may want to request a unique room name before attempting to create the room (e.g., to avoid the possibility of a room conflict). Naturally, one way to do so is for the creator's client to generate a globally unique identifier, for example as defined in &rfc4122;. Another way is for the client to ask the MUC service for a unique room ID (which the service will thus reserve for that user).</p>
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</section1>
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<section1 topic='Protocol' anchor='proto'>
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<p>The room creator requests a unique room name by sending an IQ-get to the service itself, containing an empty <unique/> element qualified by the 'http://jabber.org/protocol/muc#unique' namespace:</p>
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<example caption='Entity Requests Unique Room Name'><![CDATA[
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<iq from='crone1@shakespeare.lit/desktop'
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id='unique1'
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to='chat.shakespeare.lit'
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type='get'>
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<unique xmlns='http://jabber.org/protocol/muc#unique'/>
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</iq>
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]]></example>
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<p>If the service supports this feature, it SHOULD return a unique room name as the XML character data of the <unique/> element (but not create the room):</p>
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<example caption='Service Returns Unique Room Name'><![CDATA[
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<iq from='chat.shakespeare.lit'
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id='unique1'
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to='crone1@shakespeare.lit/desktop'
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type='result'>
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<unique xmlns='http://jabber.org/protocol/muc#unique'>
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6d9423a55f499b29ad20bf7b2bdea4f4b885ead1
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</unique>
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</iq>
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]]></example>
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<p>The service MAY refuse to return a unique room name to entities that are not entitled to create rooms, entities that have sent an excessive number of requests for unique room names, etc.</p>
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<p>The service MAY use any algorithm that ensures the creation of a room name that will be permanently unique in the context of the service (e.g., a cryptographic hash of the requesting JID, datetime, and random salt), or simply use a UUID as defined by <cite>RFC 4122</cite>.</p>
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<p>The room creator would then use the XML character data of the <unique/> element as the node identifier portion of the room JID it requests:</p>
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<example caption='Owner Creates Room With Unique Name'><![CDATA[
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<presence
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from='crone1@shakespeare.lit/desktop'
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to='6d9423a55f499b29ad20bf7b2bdea4f4b885ead1@chat.shakespeare.lit/firstwitch'>
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<x xmlns='http://jabber.org/protocol/muc'/>
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</presence>
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]]></example>
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</section1>
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<section1 topic='Determining Support' anchor='support'>
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<p>If a MUC service supports the protocol specified herein, it MUST advertise that fact by returning a feature of "http://jabber.org/protocol/muc#unique" in response to &xep0030; information requests &NSNOTE;.</p>
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<example caption="Service discovery information request"><![CDATA[
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<iq from='crone1@shakespeare.lit/desktop'
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id='disco1'
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to='chat.shakespeare.lit'
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type='get'>
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<query xmlns='http://jabber.org/protocol/disco#info'/>
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</iq>
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]]></example>
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<example caption="Service discovery information response"><![CDATA[
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<iq from='chat.shakespeare.lit'
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id='disco1'
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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/disco#info'>
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[...]
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<feature var='http://jabber.org/protocol/muc#unique'/>
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[...]
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</query>
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</iq>
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]]></example>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<code><![CDATA[
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<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='http://jabber.org/protocol/muc#unique'
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xmlns='http://jabber.org/protocol/muc#unique'
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elementFormDefault='qualified'>
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<xs:element name='unique' type='xs:string'/>
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</xs:schema>
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]]></code>
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</section1>
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</xep>
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