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https://github.com/moparisthebest/xeps
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git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@2663 4b5297f7-1745-476d-ba37-a9c6900126ab
321 lines
15 KiB
XML
321 lines
15 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>Publishing Stream Initiation Requests</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 Stream Initiation request. The protocol is used mainly to inform other entities that a particular file is available for transfer via the File Transfer protocol defined in XEP-0096.</abstract>
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&LEGALNOTICE;
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<number>0137</number>
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<status>Draft</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-0095</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>sipub</shortname>
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<schemaloc>
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<url>http://www.xmpp.org/schemas/sipub.xsd</url>
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</schemaloc>
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&linuxwolf;
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&temas;
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<revision>
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<version>1.0</version>
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<date>2005-08-26</date>
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<initials>psa</initials>
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<remark>Per a vote of the Jabber Council, advanced status to Draft.</remark>
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</revision>
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<revision>
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<version>0.3</version>
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<date>2005-07-21</date>
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<initials>psa</initials>
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<remark>Corrected several errors in the text and examples.</remark>
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</revision>
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<revision>
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<version>0.2</version>
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<date>2004-11-03</date>
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<initials>psa</initials>
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<remark>Editorial review: clarified text throughout and corrected several errors in the examples.</remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2004-06-16</date>
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<initials>lw/tjm</initials>
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<remark>Initial version.</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>&xep0095; defines a protocol to initiate a data stream between two Jabber/XMPP entities (e.g., for the purpose of &xep0096;). However, the sender is still responsible for informing potential receivers about the existence of a given stream. This document provides an automated way for a sender to announce the availability of a stream without initiating the data transfer. The purpose is to provide a "pull" protocol that enables a receiver to then request initiation of the stream from the sender.</p>
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</section1>
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<section1 topic='Requirements' anchor='requirements'>
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<p>This proposal addresses the following requirements:</p>
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<ul>
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<li>Allow a potential receiver (rather than the sender) to initiate a data stream.</li>
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<li>Integrate Stream Initiation (SI) with &xep0060;.</li>
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<li>Integrate Stream Initiation with &xep0004;.</li>
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</ul>
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</section1>
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<section1 topic='Use Cases' anchor='usecase'>
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<section2 topic='Publishing an SI Request' anchor='usecase.publish'>
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<p>A stream owner uses the <sipub/> element to announce that it can perform a specific SI request. This element can be sent to a publish-subscribe (XEP-0060) node, or sent directly to potential recipients within a &MESSAGE; stanza.</p>
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<p>The format of the <sipub/> element is as follows:</p>
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<example caption='Sample <sipub/>'><![CDATA[
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<sipub xmlns='http://jabber.org/protocol/sipub'
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from='sender-jid'
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id='publish-0123'
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profile='si-profile'
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mime-type='mime/type'>
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<profile xmlns='si-profile' ...>...</profile>
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</sipub>
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]]></example>
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<p>This format is nearly identical to that for the stream initiation <si/> element (see <cite>XEP-0095</cite>). The major difference is the lack of the feature negotiation for the stream methods, and the addition of a 'from' attribute.</p>
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<p>The 'from' attribute SHOULD be present, and MUST be present if the stanza containing the <sipub/> is not from the stream owner (e.g., if the stream is advertised at a publish-subscribe node). If present, this attribute MUST be the valid JID for the stream 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 potential sender.</p>
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<p>As with stream initiation, the 'profile' attribute MUST be present, and MUST be the namespace URI governing the profile information. It identifies the format for the SI profile.</p>
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<p>As with stream initiation, the 'mime-type' attribute SHOULD be present, and MUST be an IANA-registered content type. <note>The IANA registry of content types is located at <<link url='http://www.iana.org/assignments/media-types/'>http://www.iana.org/assignments/media-types/</link>>.</note> It provides the receiver with additional information about what the data stream will be.</p>
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<p>The <sipub/> element MUST contain an element qualified by the namespace specified by the 'profile' attribute (e.g., <file xmlns='http://jabber.org/protocol/si/profile/file-transfer'/> for file transfer). This is the additional information about the data stream.</p>
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<p>The <sipub/> information is typically provided via pubsub:</p>
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<example caption='Sender advertises stream via publish-subscribe'><![CDATA[
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<iq from='bard@shakespeare.lit/globe'
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to='pubsub.shakespeare.lit'
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id='ps1'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<publish node='characters'>
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<sipub xmlns='http://jabber.org/protocol/sipub'
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from='bard@shakespeare.lit'
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id='publish-0123'
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mime-type='application/pdf'
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profile='http://jabber.org/protocol/si/profile/file-transfer'>
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<file xmlns='http://jabber.org/protocol/si/profile/file-transfer'
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name='NDA.pdf'
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size='138819'
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date='2004-01-28T10:07Z'>
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<desc>All Shakespearean characters must sign and return this NDA ASAP</desc>
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</file>
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</sipub>
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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='pubsub.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='characters'>
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<item id='current'>
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<sipub xmlns='http://jabber.org/protocol/sipub'
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from='bard@shakespeare.lit'
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id='publish-0123'
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mime-type='application/pdf'
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profile='http://jabber.org/protocol/si/profile/file-transfer'>
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<file xmlns='http://jabber.org/protocol/si/profile/file-transfer'
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name='NDA.pdf'
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size='138819'
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date='2004-01-28T10:07Z'>
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<desc>All Shakespearean characters must sign and return this NDA ASAP</desc>
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</file>
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</sipub>
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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 <sipub/> element MAY also be included directly within a &MESSAGE; stanza sent to another entity (or multiple entities, e.g., in &xep0045; or via &xep0033;). 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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<sipub xmlns='http://jabber.org/protocol/sipub'
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id='publish-0123'
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mime-type='application/pdf'
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profile='http://jabber.org/protocol/si/profile/file-transfer'>
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<file xmlns='http://jabber.org/protocol/si/profile/file-transfer'
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name='NDA.pdf'
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size='138819'
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date='2004-01-28T10:07Z'>
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<desc>All Shakespearean characters must sign and return this NDA ASAP</desc>
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</file>
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</sipub>
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</message>
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]]></example>
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</section2>
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<section2 topic='Integration with Data Forms' anchor='usecase.xdata'>
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<p>One of the goals of sipub is to integrate <cite>Stream Initiation</cite> with <cite>Data Forms</cite> to provide a "file upload" capability. This is accomplished via the datatypes specified in &xep0122;. Each datatype is specific to the profile desired.</p>
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<p>For example the datatype "sipub:file-transfer" is used to identify the file upload field(s) corresponding to <cite>XEP-0096</cite>:</p>
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<example caption='"Upload File" Data Forms Field'><![CDATA[
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<field var='file' type='text-single' label='File to Upload'>
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<validate xmlns='http://jabber.org/protocol/xdata-validate'
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datatype='sipub:file-transfer'/>
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</field>
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]]></example>
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<p>When submitting such a form, a field's value(s) MUST be the <sipub/> identifier(s). Also, the submitter MUST provide an <sipub/> element within the data form for each file to be uploaded:</p>
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<example caption='Submitting an "Upload File" form'><![CDATA[
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<x xmlns='jabber:x:data' type='submit'>
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<field var='file'>
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<value>publish-0123</value>
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</field>
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<sipub xmlns='http://jabber.org/protocol/sipub'
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id='publish-0123'
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mime-type='text/html'
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profile='http://jabber.org/protocol/si/profile/file-transfer'>
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<file xmlns='http://jabber.org/protocol/si/profile/file-transfer'
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name='missive.html'
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size='1024'
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date='2005-07-21T11:21Z'/>
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</sipub>
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</x>
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]]></example>
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<p>The form processor will use this to retrieve the file(s) to be uploaded.</p>
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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 starts the stream initiation session by sending an IQ-get to the sender, using the <start xmlns='http://jabber.org/protocol/sipub'/> 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 stream'><![CDATA[
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<iq type='get'
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id='sipub-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='http://jabber.org/protocol/sipub'
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id='publish-0123'/>
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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 stream initiation identifier to be used:</p>
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<example caption='Sender accepts request to start stream'><![CDATA[
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<iq type='result'
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id='sipub-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='http://jabber.org/protocol/sipub'
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sid='session-87651234'/>
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</iq>
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]]></example>
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<p>Then the sender begins the stream initiation negotiation:</p>
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<example caption='Sender starts negotiation'><![CDATA[
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<iq type='set'
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id='sipub-set-1'
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from='romeo@montague.net/pda'
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to='juliet@capulet.com/balcony'>
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<si xmlns='http://jabber.org/protocol/si'
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id='session-87651234'
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mime-type='text/html'
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profile='http://jabber.org/protocol/si/profile/file-transfer'>
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<file xmlns='http://jabber.org/protocol/si/profile/file-transfer'
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name='missive.html'
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size='1024'
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date='2005-07-21T11:21Z'>
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<desc>A love letter</desc>
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</file>
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</si>
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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='sipub-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='http://jabber.org/protocol/sipub'>publish-0123</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='sipub-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='http://jabber.org/protocol/sipub'>publish-0123</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='Implementation Notes' achor='impl-notes'>
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<section2 topic='Publish ID versus SI ID'>
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<p>When publishing a stream via the <sipub/> element, the identifier SHOULD NOT be used as-is for the <si/> element, since a single publication will likely result in multiple <si/> requests, possibly from the same receiver.</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>This document introduces no security concerns beyond those specified in <cite>XEP-0060</cite> and the relevant Stream Initiation profile 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; includes 'http://jabber.org/protocol/sipub' in its registry of protocol namespaces.</p>
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</section2>
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<section2 topic='Data Form Validation Datatypes' anchor='registrar.xdata-validate'>
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<p>The XMPP Registrar includes 'sipub:' in its registry of Data Forms Validation Datatype Prefixes.</p>
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<p>Normally, each SI profile that wishes to be considered for use with Data Forms MUST register its own datatype qualified by the "sipub:" prefix. However, this document provides an initial seed, based on the currently accepted SI profiles. The following datatypes shall be registered for use with Data Forms Validation:</p>
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<code caption='Data Forms Validation Datatypes Registry Submission'><![CDATA[
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<datatype>
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<name>sipub:file-transfer</name>
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<desc>Datatype for publishing an SI using the File Transfer Profile</desc>
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<doc>XEP-0096</doc>
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</datatype>
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]]></code>
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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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targetNamespace='http://jabber.org/protocol/sipub'
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xmlns='http://jabber.org/protocol/sipub'
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elementFormDefault='qualified'>
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<xs:annotation>
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<xs:documentation>
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The protocol documented by this schema is defined in
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XEP-0137: http://www.xmpp.org/extensions/xep-0137.html
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</xs:documentation>
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</xs:annotation>
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<xs:element name='sipub'>
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<xs:annotation>
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<xs:documentation>This is the root content element for advertising a stream.</xs:documentation>
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</xs:annotation>
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<xs:complexType>
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<xs:sequence>
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<xs:any namespace='##other' minOccurs='1' maxOccurs='1'/>
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</xs:sequence>
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<xs:attribute name='id' type='xs:string' use='required'/>
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<xs:attribute name='from' type='xs:string' use='optional'/>
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<xs:attribute name='mime-type' type='xs:string' use='optional'/>
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<xs:attribute name='profile' type='xs:string' use='optional'/>
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</xs:complexType>
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</xs:element>
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<xs:element name='start'>
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<xs:annotation>
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<xs:documentation>This is the element for requesting retrieval of a stream.</xs:documentation>
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</xs:annotation>
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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:annotation>
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<xs:documentation>This is the element for specifying the stream to be retrieved.</xs:documentation>
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</xs:annotation>
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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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