mirror of
https://github.com/moparisthebest/xeps
synced 2024-11-25 02:32:18 -05:00
339bfca857
git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@1253 4b5297f7-1745-476d-ba37-a9c6900126ab
255 lines
12 KiB
XML
255 lines
12 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
|
|
<!DOCTYPE xep SYSTEM 'xep.dtd' [
|
|
<!ENTITY % ents SYSTEM 'xep.ent'>
|
|
%ents;
|
|
]>
|
|
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
|
|
<xep>
|
|
<header>
|
|
<title>Message Receipts</title>
|
|
<abstract>This document specifies an XMPP protocol extension for message receipts.</abstract>
|
|
&LEGALNOTICE;
|
|
<number>0184</number>
|
|
<status>Draft</status>
|
|
<type>Standards Track</type>
|
|
<sig>Standards</sig>
|
|
<approver>Council</approver>
|
|
<dependencies>
|
|
<spec>XMPP Core</spec>
|
|
</dependencies>
|
|
<supersedes>
|
|
<spec>XEP-0022 (in part)</spec>
|
|
</supersedes>
|
|
<supersededby/>
|
|
<shortname>receipts</shortname>
|
|
<schemaloc>
|
|
<url>http://www.xmpp.org/schemas/receipts.xsd</url>
|
|
</schemaloc>
|
|
&stpeter;
|
|
&hildjj;
|
|
<revision>
|
|
<version>1.0</version>
|
|
<date>2007-09-26</date>
|
|
<initials>psa</initials>
|
|
<remark><p>Per a vote of the XMPP Council, advanced to Draft.</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.4</version>
|
|
<date>2007-05-30</date>
|
|
<initials>psa</initials>
|
|
<remark><p>Per Council feedback, modified to use dedicated namespace (not AMP).</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.3</version>
|
|
<date>2006-11-06</date>
|
|
<initials>psa</initials>
|
|
<remark><p>Removed reliability features, which belong at a different level.</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.2</version>
|
|
<date>2006-09-21</date>
|
|
<initials>psa</initials>
|
|
<remark><p>Added two more scenarios; defined business rule about not sending to bare JIDs; specified security consideration regarding presence leaks.</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.1</version>
|
|
<date>2006-04-11</date>
|
|
<initials>psa</initials>
|
|
<remark><p>Initial version.</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.0.2</version>
|
|
<date>2006-04-07</date>
|
|
<initials>psa</initials>
|
|
<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>
|
|
</revision>
|
|
<revision>
|
|
<version>0.0.1</version>
|
|
<date>2006-03-27</date>
|
|
<initials>psa</initials>
|
|
<remark><p>First draft.</p></remark>
|
|
</revision>
|
|
</header>
|
|
<section1 topic='Introduction' anchor='intro'>
|
|
<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>
|
|
<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>
|
|
</section1>
|
|
<section1 topic='Requirements' anchor='reqs'>
|
|
<p>This document addresses the following requirements:</p>
|
|
<ol>
|
|
<li>Enable a sender to request notification that an XMPP message stanza has been received.</li>
|
|
<li>Enable a recipient to provide message receipts if desired.</li>
|
|
</ol>
|
|
<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>
|
|
</section1>
|
|
<section1 topic='Protocol Format' anchor='format'>
|
|
<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>
|
|
<p>There are two allowable elements in this namespace:</p>
|
|
<ul>
|
|
<li><request/> -- included by a sending entity that wishes to know if the message has been received.</li>
|
|
<li><received/> -- included by a receiving entity that wishes to inform the sending entity that the message has been received.</li>
|
|
</ul>
|
|
<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>
|
|
<p>The following is an example of a message that includes a request for return receipt.</p>
|
|
<example caption='A message with receipt requested'><![CDATA[
|
|
<message
|
|
from='northumberland@shakespeare.lit/westminster'
|
|
id='richard2-4.1.247'
|
|
to='kingrichard@royalty.england.lit/throne'>
|
|
<body>My lord, dispatch; read o'er these articles.</body>
|
|
<request xmlns='urn:xmpp:receipts'/>
|
|
</message>
|
|
]]></example>
|
|
<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>
|
|
<example caption='A message receipt'><![CDATA[
|
|
<message
|
|
from='kingrichard@royalty.england.lit/throne'
|
|
id='richard2-4.1.247'
|
|
to='northumberland@shakespeare.lit/westminster'>
|
|
<received xmlns='urn:xmpp:receipts'/>
|
|
</message>
|
|
]]></example>
|
|
<p>The <received/> element SHOULD be the only child of the &MESSAGE; stanza and MUST mirror the 'id' of the sent message.</p>
|
|
</section1>
|
|
<section1 topic='Business Rules' anchor='rules'>
|
|
<p>The following business rules apply:</p>
|
|
<ol start='1'>
|
|
<li><p>A sender SHOULD NOT include a request for message receipts when sending a message to the bare JID (&BAREJID;) of the recipient, only when sending to a full JID (&FULLJID;).</p></li>
|
|
<li><p>A sender SHOULD NOT include a request for message receipts unless it knows (via &xep0030; or &xep0115;) that the intended recipient supports the protocol described herein or unless the use of message receipts is negotiated via &xep0155;.</p></li>
|
|
<li><p>A sender SHOULD include an 'id' attribute on the message so that the sender can properly track the receipt.</p></li>
|
|
</ol>
|
|
<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>
|
|
</section1>
|
|
<section1 topic='Determining Support' anchor='disco'>
|
|
<p>If a sender wishes to request message receipts, it SHOULD first determine whether the intended recipient supports message receipts. This can be done directly via <cite>Service Discovery</cite> or indirectly via <cite>Entity Capabilities</cite>.</p>
|
|
<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>
|
|
<example caption="Initial Service Discovery information request"><![CDATA[
|
|
<iq from='northumberland@shakespeare.lit/westminster'
|
|
to='kingrichard@royalty.england.lit/throne'
|
|
type='get'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'/>
|
|
</iq>
|
|
]]></example>
|
|
<example caption="Service Discovery information response"><![CDATA[
|
|
<iq from='kingrichard@royalty.england.lit/throne'
|
|
to='northumberland@shakespeare.lit/westminster'
|
|
type='result'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'>
|
|
...
|
|
<feature var='urn:xmpp:receipts'/>
|
|
...
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
</section1>
|
|
<section1 topic='Negotiation' anchor='neg'>
|
|
<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>
|
|
<example caption="User requests chat session"><![CDATA[
|
|
<message type='normal'
|
|
from='northumberland@shakespeare.lit/westminster'
|
|
to='kingrichard@royalty.england.lit/throne'
|
|
id='init1'>
|
|
<thread>ffd7076498744578d10edabfe7f4a866</thread>
|
|
<feature xmlns='http://jabber.org/protocol/feature-neg'>
|
|
<x xmlns='jabber:x:data' type='form'>
|
|
<field var='FORM_TYPE' type='hidden'>
|
|
<value>urn:xmpp:ssn</value>
|
|
</field>
|
|
<field label='Accept this chat?'
|
|
type='boolean'
|
|
var='accept'>
|
|
<value>true</value>
|
|
<required/>
|
|
</field>
|
|
<field label='Enable Message Receipts?'
|
|
type='boolean'
|
|
var='urn:xmpp:receipts'>
|
|
<value>0</value>
|
|
</field>
|
|
</x>
|
|
</feature>
|
|
</message>
|
|
]]></example>
|
|
<example caption="Contact accepts offer and specifies parameters"><![CDATA[
|
|
<message type='normal'
|
|
from='kingrichard@royalty.england.lit/throne'
|
|
to='northumberland@shakespeare.lit/westminster'
|
|
id='init1'>
|
|
<thread>ffd7076498744578d10edabfe7f4a866</thread>
|
|
<feature xmlns='http://jabber.org/protocol/feature-neg'>
|
|
<x xmlns='jabber:x:data' type='submit'>
|
|
<field var='FORM_TYPE' type='hidden'>
|
|
<value>urn:xmpp:ssn</value>
|
|
</field>
|
|
<field var='accept'>
|
|
<value>true</value>
|
|
</field>
|
|
<field var='urn:xmpp:receipts'>
|
|
<value>1</value>
|
|
</field>
|
|
</x>
|
|
</feature>
|
|
</message>
|
|
]]></example>
|
|
</section1>
|
|
<section1 topic='Implementation Notes' anchor='impl'>
|
|
<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>
|
|
</section1>
|
|
<section1 topic='Security Considerations' anchor='security'>
|
|
<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>
|
|
</section1>
|
|
<section1 topic='IANA Considerations' anchor='iana'>
|
|
<p>No interaction with &IANA; is necessary as a result of this document.</p>
|
|
</section1>
|
|
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
|
|
<section2 topic='Protocol Namespaces' anchor='ns'>
|
|
<p>The ®ISTRAR; includes "urn:xmpp:receipts" in its registry of protocol namespaces (see &NAMESPACES;).</p>
|
|
</section2>
|
|
<section2 topic='Field Standardization' anchor='registrar-formtype'>
|
|
<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>
|
|
<code caption='Registry Submission'><![CDATA[
|
|
<form_type>
|
|
<name>urn:xmpp:ssn</name>
|
|
<field
|
|
var='urn:xmpp:receipts'
|
|
type='boolean'
|
|
label='Whether to enable Message Receipts per XEP-0184'/>
|
|
</form_type>
|
|
]]></code>
|
|
</section2>
|
|
</section1>
|
|
<section1 topic='XML Schema' anchor='schema'>
|
|
<code><![CDATA[
|
|
<?xml version='1.0' encoding='UTF-8'?>
|
|
|
|
<xs:schema
|
|
xmlns:xs='http://www.w3.org/2001/XMLSchema'
|
|
targetNamespace='urn:xmpp:receipts'
|
|
xmlns='urn:xmpp:receipts'
|
|
elementFormDefault='qualified'>
|
|
|
|
<xs:annotation>
|
|
<xs:documentation>
|
|
The protocol documented by this schema is defined in
|
|
XEP-0184: http://www.xmpp.org/extensions/xep-0184.html
|
|
</xs:documentation>
|
|
</xs:annotation>
|
|
|
|
<xs:element name='received' type='empty'/>
|
|
|
|
<xs:element name='request' type='empty'/>
|
|
|
|
<xs:simpleType name='empty'>
|
|
<xs:restriction base='xs:string'>
|
|
<xs:enumeration value=''/>
|
|
</xs:restriction>
|
|
</xs:simpleType>
|
|
|
|
</xs:schema>
|
|
]]></code>
|
|
</section1>
|
|
<section1 topic='Acknowledgements' anchor='ack'>
|
|
<p>Thanks to Joe Kemp and Kevin Smith for their input.</p>
|
|
</section1>
|
|
</xep>
|