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https://github.com/moparisthebest/xeps
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git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@3992 4b5297f7-1745-476d-ba37-a9c6900126ab
261 lines
12 KiB
XML
261 lines
12 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>Message Receipts</title>
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<abstract>This specification defines an XMPP protocol extension for message receipts, whereby the sender of a message can request notification that it has been received by the intended recipient.</abstract>
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&LEGALNOTICE;
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<number>0184</number>
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<status>Draft</status>
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<interim/>
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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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</dependencies>
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<supersedes>
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<spec>XEP-0022 (in part)</spec>
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</supersedes>
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<supersededby/>
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<shortname>receipts</shortname>
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<schemaloc>
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<url>http://www.xmpp.org/schemas/receipts.xsd</url>
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</schemaloc>
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&stpeter;
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&hildjj;
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<revision>
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<version>1.1rc1</version>
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<date>in progress, last updated 2010-02-24</date>
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<initials>psa</initials>
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<remark><p>Relaxed the business rules to allow inclusion of receipt requests even to the bare JID and even if the sender does not yet know if the intended recipient supports this protocol.</p></remark>
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</revision>
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<revision>
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<version>1.0</version>
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<date>2007-09-26</date>
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<initials>psa</initials>
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<remark><p>Per a vote of the XMPP Council, advanced to Draft.</p></remark>
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</revision>
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<revision>
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<version>0.4</version>
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<date>2007-05-30</date>
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<initials>psa</initials>
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<remark><p>Per Council feedback, modified to use dedicated namespace (not AMP).</p></remark>
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</revision>
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<revision>
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<version>0.3</version>
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<date>2006-11-06</date>
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<initials>psa</initials>
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<remark><p>Removed reliability features, which belong at a different level.</p></remark>
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</revision>
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<revision>
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<version>0.2</version>
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<date>2006-09-21</date>
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<initials>psa</initials>
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<remark><p>Added two more scenarios; defined business rule about not sending to bare JIDs; specified security consideration regarding presence leaks.</p></remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2006-04-11</date>
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<initials>psa</initials>
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<remark><p>Initial version.</p></remark>
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</revision>
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<revision>
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<version>0.0.2</version>
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<date>2006-04-07</date>
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<initials>psa</initials>
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<remark><p>Added text and examples for service discovery; added text and examples for chat session negotiation; added recommendations regarding message processing, retries, etc.</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>2006-03-27</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>While &xep0079; provides message acknowledgements at the server level, it does not extend that model all the way to the client. However, sometimes client-level acknowledgements are needed, for example to provide "receipts". This document defines a mechanism for XMPP message receipts, which are functionally equivalent to the "delivered" or "displayed" event in &xep0022;, which this specification in part obsoletes. <note>This specification does not distinguish between delivery and presentation, as was done in the message events protocol, in part because no existing clients make the distinction.</note></p>
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<p>Note: This extension is functionally equivalent to an <cite>Advanced Message Processing</cite> rule of "receipt" but uses a dedicated namespace to simplify processing by end user clients and intermediate routers.</p>
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</section1>
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<section1 topic='Requirements' anchor='reqs'>
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<p>This document addresses the following requirements:</p>
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<ol>
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<li>Enable a sender to request notification that an XMPP message stanza has been received.</li>
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<li>Enable a recipient to provide message receipts if desired.</li>
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</ol>
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<p>Note: This document explicitly does not define a protocol for "guaranteed delivery", since that term (like "security") means different things to different people. Instead, we define a more focused protocol that addresses the need for message receipts, thus solving one problem that falls under the heading of "guaranteed delivery".</p>
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</section1>
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<section1 topic='Protocol Format' anchor='format'>
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<p>In order to make it possible for senders to request and for recipients to generate message receipts, we define a dedicated protocol extension qualified by the 'urn:xmpp:receipts' namespace.</p>
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<p>There are two allowable elements in this namespace:</p>
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<ul>
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<li><request/> -- included by a sending entity that wishes to know if the message has been received.</li>
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<li><received/> -- included by a receiving entity that wishes to inform the sending entity that the message has been received.</li>
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</ul>
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<p>Specifically, the receiving entity shall return a <received/> notice if it has received and processed the message. The term "processed" is understood to include presentation to a human user if appropriate or any other application-specific client-side processing, including generation of an error response if the application determines that the message contents cannot be handled.</p>
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<p>The following is an example of a message that includes a request for return receipt.</p>
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<example caption='A message with receipt requested'><![CDATA[
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<message
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from='northumberland@shakespeare.lit/westminster'
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id='richard2-4.1.247'
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to='kingrichard@royalty.england.lit/throne'>
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<body>My lord, dispatch; read o'er these articles.</body>
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<request xmlns='urn:xmpp:receipts'/>
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</message>
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]]></example>
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<p>The recipient shall generate a receipt if and only if it supports the protocol defined herein and it is configured to return receipts, either globally or for this recipient (otherwise it MUST NOT return a receipt and SHOULD NOT return an error).</p>
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<example caption='A message receipt'><![CDATA[
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<message
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from='kingrichard@royalty.england.lit/throne'
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id='richard2-4.1.247'
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to='northumberland@shakespeare.lit/westminster'>
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<received xmlns='urn:xmpp:receipts'/>
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</message>
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]]></example>
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<p>The <received/> element SHOULD be the only child of the &MESSAGE; stanza and MUST mirror the 'id' of the sent message.</p>
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</section1>
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<section1 topic='Business Rules' anchor='rules'>
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<p>The following business rules apply:</p>
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<ol start='1'>
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<li><p>If receipts are desired, a sender SHOULD include a request for message receipts on all messages, no matter whether sending to the bare JID &LOCALBARE; of the recipient or the full JID &LOCALFULL;.</p></li>
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<li><p>A sender MUST include an 'id' attribute on the message so that the sender can properly track the receipt.</p></li>
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</ol>
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<p>Naturally, message receipts can be combined with the rules specified in <cite>Advanced Message Processing</cite> (e.g., the deliver rule) for more complete reporting.</p>
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</section1>
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<section1 topic='Determining Support' anchor='disco'>
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<p>If an entity supports message receipts, it MUST report that by including a service discovery feature of "urn:xmpp:receipts" in response to disco#info requests:</p>
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<example caption="Initial Service Discovery information request"><![CDATA[
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<iq from='northumberland@shakespeare.lit/westminster'
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id='disco1'
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to='kingrichard@royalty.england.lit/throne'
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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='kingrichard@royalty.england.lit/throne'
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id='disco1'
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to='northumberland@shakespeare.lit/westminster'
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type='result'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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<feature var='urn:xmpp:receipts'/>
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</query>
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</iq>
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]]></example>
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<p>A sender MAY include a request for message receipts even if it has not been able to determine if the intended recipient supports message receipts. This can be done directly via <cite>Service Discovery</cite> or indirectly via <cite>Entity Capabilities</cite>.</p>
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</section1>
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<section1 topic='Negotiation' anchor='neg'>
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<p>Two entities MAY negotiate the use of message receipts for a given session using <cite>Stanza Session Negotiation</cite>. The parameter to be negotiated is named "urn:xmpp:receipts". Its use is illustrated in the following examples.</p>
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<example caption="User requests chat session"><![CDATA[
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<message type='normal'
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from='northumberland@shakespeare.lit/westminster'
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to='kingrichard@royalty.england.lit/throne'
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id='init1'>
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<thread>ffd7076498744578d10edabfe7f4a866</thread>
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<feature xmlns='http://jabber.org/protocol/feature-neg'>
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<x xmlns='jabber:x:data' type='form'>
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<field var='FORM_TYPE' type='hidden'>
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<value>urn:xmpp:ssn</value>
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</field>
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<field label='Accept this chat?'
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type='boolean'
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var='accept'>
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<value>true</value>
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<required/>
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</field>
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<field label='Enable Message Receipts?'
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type='boolean'
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var='urn:xmpp:receipts'>
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<value>0</value>
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</field>
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</x>
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</feature>
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</message>
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]]></example>
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<example caption="Contact accepts offer and specifies parameters"><![CDATA[
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<message type='normal'
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from='kingrichard@royalty.england.lit/throne'
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to='northumberland@shakespeare.lit/westminster'
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id='init1'>
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<thread>ffd7076498744578d10edabfe7f4a866</thread>
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<feature xmlns='http://jabber.org/protocol/feature-neg'>
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<x xmlns='jabber:x:data' type='submit'>
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<field var='FORM_TYPE' type='hidden'>
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<value>urn:xmpp:ssn</value>
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</field>
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<field var='accept'>
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<value>true</value>
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</field>
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<field var='urn:xmpp:receipts'>
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<value>1</value>
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</field>
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</x>
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</feature>
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</message>
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]]></example>
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</section1>
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<section1 topic='Implementation Notes' anchor='impl'>
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<p>Although a sender MAY attempt to resend a message if it knows that the recipient supports message receipts and it does not receive a reply within some configurable timeout period, resend logic is out of scope for this specification.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>It is possible for a recipient to leak its presence when returning message receipts; therefore, a recipient SHOULD NOT return message receipts to senders who are not otherwise authorized to view its presence.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>No interaction with &IANA; is necessary as a result of this document.</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:receipts" in its registry of protocol namespaces (see &NAMESPACES;).</p>
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</section2>
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<section2 topic='Field Standardization' anchor='registrar-formtype'>
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<p>&xep0068; defines a process for standardizing the fields used within Data Forms qualified by a particular namespace, and the XMPP Registrar maintains a registry of such fields (see &FORMTYPES;). The Registrar shall add the following field for use in Stanza Session Negotiation forms:</p>
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<code caption='Registry Submission'><![CDATA[
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<form_type>
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<name>urn:xmpp:ssn</name>
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<field
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var='urn:xmpp:receipts'
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type='boolean'
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label='Whether to enable Message Receipts per XEP-0184'/>
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</form_type>
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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='urn:xmpp:receipts'
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xmlns='urn:xmpp:receipts'
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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-0184: http://www.xmpp.org/extensions/xep-0184.html
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</xs:documentation>
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</xs:annotation>
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<xs:element name='received' type='empty'/>
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<xs:element name='request' type='empty'/>
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<xs:simpleType name='empty'>
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<xs:restriction base='xs:string'>
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<xs:enumeration value=''/>
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</xs:restriction>
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</xs:simpleType>
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</xs:schema>
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]]></code>
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</section1>
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<section1 topic='Acknowledgements' anchor='ack'>
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<p>Thanks to Joe Kemp and Kevin Smith for their input.</p>
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</section1>
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</xep>
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