mirror of https://github.com/moparisthebest/xeps
0.0.2
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Peter Saint-Andre
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<?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>Publishing Available Jingle Sessions</title>
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<abstract>This specification defines an XMPP protocol extension that enables an XMPP entity to advertise the fact that it is willing accept a particular Jingle session request. The protocol is used mainly to inform other entities that a particular file is available for transfer via the Jingle File Transfer protocol defined in XEP-0234.</abstract>
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&LEGALNOTICE;
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<number>xxxx</number>
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<status>ProtoXEP</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-0030</spec>
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<spec>XEP-0234</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>jinglepub</shortname>
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<schemaloc/>
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&fippo;
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&lance;
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&stpeter;
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<revision>
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<version>0.0.2</version>
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<date>2014-08-12</date>
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<initials>ls/psa/ph</initials>
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<remark>
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<ul>
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<li>Changed payload to use one or more Jingle <description/> elements (this provides support for content with multiple media types, such as audio+video).</li>
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<li>Removed 'app' attribute, since we include the application-format description as a child element.</li>
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<li>Removed 'mime-type' attribute, since it can be signalled in the application-format description if needed.</li>
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<li>Added <meta/> element to provide human-friendly information about the session.</li>
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<li>Incremented the protocol version number from 0 to 1.</li>
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</ul>
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</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>2014-07-30</date>
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<initials>ph/ls/psa</initials>
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<remark>First draft.</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>This document defines a way for an entity that can initiate a Jingle session (often for the purpose of file transfer as specified in &xep0234;) to advertise that session, thus enabling a receiver to then request initiation of the session by the sender. In essence, this document defines the Jingle equivalent of &xep0137; (previously defined for &xep0095;).</p>
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</section1>
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<section1 topic='Use Cases' anchor='usecase'>
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<section2 topic='Publishing a Jingle Session Request' anchor='usecase.publish'>
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<p>A session owner uses the <jinglepub/> element to announce that it can initiate a specific Jingle session request. This element can be sent to a publish-subscribe node (see &xep0060; and &xep0163;), or sent directly to potential recipients within a &MESSAGE; stanza.</p>
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<p>The format of the <jinglepub/> element is as follows:</p>
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<example caption='Sample <jinglepub/>'><![CDATA[
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<jinglepub xmlns='urn:xmpp:jinglepub:1'
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from='sender-jid'
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id='someid'>
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[<meta/> element(s) for human-friendly information]
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[<description/> element(s) for application format(s)]
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</jinglepub>
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]]></example>
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<p>The 'from' attribute MUST be present and MUST be the valid JID for the session owner.</p>
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<p>The 'id' attribute is an opaque identifier. This attribute MUST be present, and MUST be a valid non-empty string. It uniquely identifies the published request at the session owner's JID.</p>
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<p>The <jinglepub/> element MUST contain a <description/> element qualified by the namespace of the relevant Jingle application format (e.g., <description xmlns='urn:xmpp:jingle:apps:file-transfer:4'/> for file transfer).</p>
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<p>The <jinglepub/> element MAY contain one or more <meta/> elements qualified by the jingle-pub namespace; if more than one element is included, each element MUST have a different value for the 'xml:lang' attribute.</p>
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<p>The <jinglepub/> information is typically provided via pubsub.</p>
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<p>The following example shows a possible payload for streaming of recorded audio/video sessions, here pushed out via PEP.</p>
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<example caption='Sender advertises session via PEP'><![CDATA[
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<iq from='bard@shakespeare.lit/globe' id='yhe51f39' type='set'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<publish node='scenes'>
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<jinglepub xmlns='urn:xmpp:jinglepub:1'
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from='bard@shakespeare.lit'
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id='9559976B-3FBF-4E7E-B457-2DAA225972BB'>
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<meta xml:lang='en'
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title='Act III, Scene I of Hamlet'
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summary='High-definition audio and video recording
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for Act III, Scene I of Hamlet, captured
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last week at the Globe Theatre, London.'/>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
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</jinglepub>
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</publish>
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</pubsub>
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</iq>
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]]></example>
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<example caption='Pubsub service pushes announcement to all subscribers'><![CDATA[
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<message from='bard@shakespeare.lit' to='juliet@capulet.com/balcony'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='scenes'>
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<item id='current'>
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<jinglepub xmlns='urn:xmpp:jinglepub:1'
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from='bard@shakespeare.lit'
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id='9559976B-3FBF-4E7E-B457-2DAA225972BB'>
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<meta xml:lang='en'
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title='Act III, Scene I of Hamlet'
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summary='High-definition audio and video recording
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for Act III, Scene I of Hamlet, captured
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last week at the Globe Theatre, London.'/>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
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</jinglepub>
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</item>
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</items>
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</event>
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</message>
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]]></example>
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<p>The <jinglepub/> element MAY also be included directly within a &MESSAGE; stanza sent to another entity (or multiple entities, e.g., in &xep0045;). This can be especially useful for informing an offline entity about an available stream.</p>
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<example caption='Advertising a stream in a message stanza'><![CDATA[
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<message from='romeo@montague.net/pda' to='juliet@capulet.com'>
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<jinglepub xmlns='urn:xmpp:jinglepub:1'
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id='9559976B-3FBF-4E7E-B457-2DAA225972BB'>
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<meta xml:lang='en'
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title='Act III, Scene I of Hamlet'
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summary='High-definition audio and video recording
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for Act III, Scene I of Hamlet, captured
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last week at the Globe Theatre, London.'/>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
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</jinglepub>
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</message>
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]]></example>
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</section2>
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<section2 topic='Triggering the Stream Initiation Request' anchor='usecase.trigger'>
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<p>A potential receiver requests initiation of the session by sending an IQ-get to the sender, using the <start xmlns='urn:xmpp:jinglepub:1'/> element. This element contains the 'id' attribute to specify which published stream to retrieve:</p>
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<example caption='Receiver requests start of session'><![CDATA[
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<iq type='get'
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id='jinglepub-request-0'
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from='juliet@capulet.com/balcony'
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to='romeo@montague.net/pda'>
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<start xmlns='urn:xmpp:jinglepub:1'
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id='9559976B-3FBF-4E7E-B457-2DAA225972BB'/>
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</iq>
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]]></example>
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<p>If the sender accepts the request, it responds with an IQ-result containing a <starting/> element. This element indicates the session identifier to be used:</p>
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<example caption='Sender accepts request to start session'><![CDATA[
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<iq type='result'
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id='jinglepub-request-0'
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from='romeo@montague.net/pda'
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to='juliet@capulet.com/balcony'>
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<starting xmlns='urn:xmpp:jinglepub:1'
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sid='851ba2'/>
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</iq>
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]]></example>
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<p>Then the sender initiates the Jingle session:</p>
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<example caption='Sender starts negotiation'><![CDATA[
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<iq from='romeo@montague.lit/orchard'
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id='nzu25s8'
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to='juliet@capulet.lit/balcony'
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type='set'>
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<jingle xmlns='urn:xmpp:jingle:1'
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action='session-initiate'
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initiator='romeo@montague.lit/orchard'
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sid='851ba2'>
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<content creator='initiator' name='scene-audio'>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
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<payload-type id='101' name='opus' clockrate='48000'>
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<parameter name='stereo' value='1'/>
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<parameter name='sprop-stereo' value='1'/>
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</payload-type>
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<payload-type id='97' name='speex' clockrate='8000'/>
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<payload-type id='18' name='G729'/>
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</description>
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<transport xmlns='urn:xmpp:jingle:transports:ice-udp:1'>
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<candidate component='1'
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foundation='1'
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generation='0'
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id='or2ii2syr1'
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ip='192.0.2.1'
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network='0'
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port='3478'
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priority='2130706431'
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protocol='udp'
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type='host'/>
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</transport>
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</content>
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<content creator='initiator' name='scene-video'>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
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<payload-type id='98' name='theora' clockrate='90000'>
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<parameter name='height' value='600'/>
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<parameter name='width' value='800'/>
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<parameter name='delivery-method' value='inline'/>
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<parameter name='configuration' value='somebase16string'/>
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<parameter name='sampling' value='YCbCr-4:2:2'/>
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</payload-type>
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<payload-type id='28' name='nv' clockrate='90000'/>
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<payload-type id='25' name='CelB' clockrate='90000'/>
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<payload-type id='32' name='MPV' clockrate='90000'/>
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<bandwidth type='AS'>128</bandwidth>
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</description>
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<transport xmlns='urn:xmpp:jingle:transports:ice-udp:1'/>
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</content>
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</jingle>
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</iq>
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]]></example>
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<p>If the requested identifier is not valid, the sender SHOULD respond with a ¬acceptable; error:</p>
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<example caption='Sender denies because of invalid id'><![CDATA[
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<iq type='error'
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id='jinglepub-set-1'
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from='romeo@montague.net/pda'
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to='juliet@capulet.com/balcony'>
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<start xmlns='urn:xmpp:jinglepub:1'>9559976B-3FBF-4E7E-B457-2DAA225972BB</start>
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<error code='405' type='modify'>
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<not-acceptable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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</error>
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</iq>
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]]></example>
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<p>If the receiver does not have permission to request the data stream, the sender SHOULD respond with a &forbidden; error:</p>
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<example caption='Sender denies because receiver is forbidden'><![CDATA[
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<iq type='error'
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id='jinglepub-set-1'
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from='romeo@montague.net/pda'
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to='juliet@capulet.com/balcony'>
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<start xmlns='urn:xmpp:jinglepub:1'>9559976B-3FBF-4E7E-B457-2DAA225972BB</start>
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<error code='403' type='auth'>
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<forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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</error>
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</iq>
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]]></example>
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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>This document introduces no security concerns beyond those specified in <cite>XEP-0060</cite> and the relevant Jingle application format in use.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>This document requires no interaction with &IANA;.</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='registrar.namespaces'>
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<p>The ®ISTRAR; will be requested to include 'urn:xmpp:jinglepub:1' in its registry of protocol namespaces.</p>
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</section2>
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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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xmlns:xml='http://www.w3.org/XML/1998/namespace'
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targetNamespace='urn:xmpp:jinglepub:1'
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xmlns='urn:xmpp:jinglepub:1'
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elementFormDefault='qualified'>
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<xs:element name='jinglepub'>
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<xs:complexType>
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<xs:sequence>
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<xs:any namespace='##other' minOccurs='1' maxOccurs='unbounded'/>
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<xs:element name='meta' type='metaElementType'/>
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</xs:sequence>
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<xs:attribute name='description' type='xs:string' use='optional'/>
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<xs:attribute name='from' type='xs:string' use='required'/>
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<xs:attribute name='id' type='xs:string' use='required'/>
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<xs:attribute name='title' type='xs:string' use='optional'/>
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</xs:complexType>
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</xs:element>
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<xs:complexType name='metaElementType'>
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<xs:simpleContent>
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<xs:extension base='empty'>
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<xs:attribute name='summary'
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type='xs:string'
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use='optional'/>
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<xs:attribute name='title'
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type='xs:string'
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use='required'/>
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<xs:attribute ref='xml:lang' use='optional'/>
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</xs:extension>
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</xs:simpleContent>
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</xs:complexType>
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<xs:element name='start'>
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<xs:complexType>
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<xs:attribute name='id' type='xs:string' use='required'/>
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</xs:complexType>
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</xs:element>
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<xs:element name='starting'>
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<xs:complexType>
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<xs:attribute name='sid' type='xs:string' use='required'/>
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</xs:complexType>
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</xs:element>
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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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