mirror of
https://github.com/moparisthebest/xeps
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205 lines
7.8 KiB
XML
205 lines
7.8 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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<!ENTITY subscription "<subscription/>">
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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>Pubsub Subscription</title>
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<abstract>This specification describe a method that allow a user to share a list of nodes on which it is Pubsub registered</abstract>
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&LEGALNOTICE;
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<number>0330</number>
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<status>Deferred</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>XEP-0163</spec>
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<spec>XEP-0060</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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<author>
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<firstname>Christine</firstname>
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<surname>Ho</surname>
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<email>nodpounod@gmail.com</email>
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<jid>christine.ho.dev@gmail.com</jid>
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</author>
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<author>
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<firstname>Timothée</firstname>
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<surname>Jaussoin</surname>
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<email>edhelas@gmail.com</email>
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<jid>edhelas@movim.eu</jid>
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</author>
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<revision>
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<version>0.1</version>
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<date>2013-06-11</date>
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<initials>psa</initials>
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<remark><p>Initial published version approved by the XMPP Council.</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>2013-03-04</date>
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<initials>psa</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>
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&xep0060; nodes are commonly used by XMPP users to subscribe to news feeds. This document describe a way, for them, to share some of the nodes to which they have subscribed with other users.
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</p>
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<p>
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The list of &xep0060; subcribed nodes is stored on a classic &xep0163; node qualified by the 'urn:xmpp:subscription' namespace. If an entity wishes to make pubsub subscriptions publicly available then the entity MAY publish them on this node. The entity SHOULD ensure that this information is kept up to date.
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</p>
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</section1>
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<section1 topic='Protocol' anchor='protocol'>
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<p>Information about the subscribed node is provided by the user client. The subscription container is defined as a classic &subscription; element with theses specific constraints :</p>
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<table caption='attributes'>
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<tr>
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<td><strong>Name</strong></td>
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<td><strong>Type</strong></td>
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<td><strong>Description</strong></td>
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<td><strong>Support</strong></td>
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</tr>
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<tr>
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<td>server</td>
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<td>attribute</td>
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<td>Any server's address</td>
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<td>REQUIRED</td>
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</tr>
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<tr>
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<td>node</td>
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<td>attribute</td>
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<td></td>
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<td>REQUIRED</td>
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</tr>
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<tr>
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<td>id</td>
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<td>node</td>
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<td></td>
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<td>RECOMMENDED</td>
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</tr>
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<tr>
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<td>title</td>
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<td>node</td>
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<td></td>
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<td>OPTIONAL</td>
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</tr>
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</table>
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<section2 topic="Item ID generation method">
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<p>The aim of this XEP is to handle a list of subscriptions. To simplify the managment of this list the ID of the &xep0060; items MUST be generated according to the following method :</p>
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<ol>
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<li>Initialize an empty string S</li>
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<li>Append the name of the server, followed by the '<' character</li>
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<li>Append the name of the node, followed by the '<' character</li>
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<li>Append the jid of the current account</li>
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<li>Compute the ID by hashing the S string using the SHA1 algorythm</li>
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</ol>
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<section3 topic="Generation Example">
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<ol>
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<li>S = ''</li>
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<li>S = 'pubsub.montague.lit<'</li>
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<li>S = 'pubsub.montague.lit<party'</li>
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<li>id = de6c6772ff43d9a604ea78e51ce28b63ab8692eb</li>
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</ol>
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</section3>
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</section2>
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</section1>
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<section1 topic='Requirements' anchor='reqs'>
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<p>The motivations for this document are to :</p>
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<ul>
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<li>Allow Jabber user's to share their &xep0060; subscriptions</li>
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<li>Add a new way to discover &xep0060; nodes</li>
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</ul>
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</section1>
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<section1 topic='Glossary' anchor='glossary'>
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<dl>
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<di>
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<dt>Personnal Eventing</dt>
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<dd>A simplified subset of Publish-Subscribe for use in the context of instant messaging and presence applications, whereby each IM user's JID is a virtual pubsub service; for details, see
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<link url='http://xmpp.org/extensions/xep-0163.html'>Personal Eventing Protocol</link>.
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</dd>
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</di>
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</dl>
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</section1>
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<section1 topic='Use Cases' anchor='usecases'>
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<section2 topic='Requesting the list of subscription' anchor='usecases'>
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<example caption='Requests the list of subscriptions'><![CDATA[
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<iq type='get'
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from='romeo@montague.lit'
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to='pubsub.shakespeare.lit'
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id='items1'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<items node='urn:xmpp:pubsub:subscription'/>
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</pubsub>
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</iq>]]></example>
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</section2>
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<section2 topic='Adding a subscription to the list' anchor='usecases'>
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<example caption='Add a subscription to the list '><![CDATA[
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<iq type="set" from="romeo@montague.lit" id="sub123">
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<pubsub xmlns="http://jabber.org/protocol/pubsub">
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<publish node="urn:xmpp:pubsub:subscription">
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<item id="0bc0e76cb803b3b107aa369169d8c0d45086f844">
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<subscription xmlns="urn:xmpp:pubsub:subscription:0"
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server="pubsub.shakespeare.lit" node="party">
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<title>Party at the Capulets</title>
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</subscription>
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</item>
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</publish>
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</pubsub>
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</iq>]]></example>
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</section2>
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<section2 topic='Removing a subscription from the list' anchor='usecases'>
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<example caption='Remove a subscription from the list '><![CDATA[
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<iq type='set'
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from='romeo@montague.lit'
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to='pubsub.shakespeare.lit'
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id='unsub1'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<retract node='urn:xmpp:pubsub:subscription'>
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<item id='0bc0e76cb803b3b107aa369169d8c0d45086f844'/>
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</retract>
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</pubsub>
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</iq>]]></example>
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</section2>
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<section2 topic='Modifiying a subscription of the list' anchor='usecases'>
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<example caption='Change the information of a subscription of the list '><![CDATA[
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<iq type='set'
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from='romeo@montague.lit'
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to='pubsub.shakespeare.lit'
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id='unsub1'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<publish node='urn:xmpp:pubsub:subscription'>
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<item id='0bc0e76cb803b3b107aa369169d8c0d45086f844'>
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<subscription xmlns='urn:xmpp:pubsub:subscription:0'
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server='pubsub.shakespeare.lit' node='party'>
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<title>Party at the Capulets [canceled !]</title>
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</subscription>
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</item>
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</publish>
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</pubsub>
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</iq>]]></example>
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</section2>
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</section1>
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<section1 topic='Internationalization Considerations' anchor='i18n'>
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<p>The title element of a &subscription; item SHOULD be in the same language as the contents of the node in question.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>The publication of user tune information is not known to introduce any new security considerations above and beyond those defined in XEP-0060: Publish-Subscribe.</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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<p>The ®ISTRAR; is requested to issue an initial namespace of "urn:xmpp:pubsub:subscription".</p>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<p>REQUIRED for protocol specifications.</p>
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</section1>
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</xep>
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