mirror of
https://github.com/moparisthebest/xeps
synced 2024-11-28 12:12:22 -05:00
ca55d37b3e
git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@198 4b5297f7-1745-476d-ba37-a9c6900126ab
254 lines
13 KiB
XML
254 lines
13 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>Proposed</status>
|
|
<type>Standards Track</type>
|
|
<jig>Standards JIG</jig>
|
|
<approver>Council</approver>
|
|
<dependencies>
|
|
<spec>XMPP Core</spec>
|
|
</dependencies>
|
|
<supersedes>
|
|
<spec>XEP-0022 (in part)</spec>
|
|
</supersedes>
|
|
<supersededby/>
|
|
<shortname>amp-receipts</shortname>
|
|
&stpeter;
|
|
&hildjj;
|
|
<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>
|
|
</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 new <cite>Advanced Message Processing</cite> rule: "receipt". In accordance with <cite>XEP-0079</cite>, we provide the following information about the receipt rule:</p>
|
|
<ul>
|
|
<li>The namespace shall be "http://jabber.org/protocol/amp?condition=receipt".</li>
|
|
<li>The condition applies only to final receipt by the intended recipient; therefore, the per-hop flag does not apply.</li>
|
|
<li>The only defined value of the receipt rule is "received".</li>
|
|
<li>This condition is met if a message processing application (client) controlled by the intended recipient 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.</li>
|
|
<li>Although any defined action may be triggered, the only action needed in order to support message receipts is the "notify" action.</li>
|
|
</ul>
|
|
<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>
|
|
<amp xmlns='http://jabber.org/protocol/amp'>
|
|
<rule condition='receipt' action='notify' value='received'/>
|
|
</amp>
|
|
</message>
|
|
]]></example>
|
|
<p>The recipient MUST generate a receipt if and only if it meets all of the following criteria:</p>
|
|
<ol>
|
|
<li>It supports Advanced Message Processing.</li>
|
|
<li>It supports the "receipt" rule.</li>
|
|
<li>It is configured to return receipts, either globally or for this recipient.</li>
|
|
</ol>
|
|
<example caption='A message receipt'><![CDATA[
|
|
<message
|
|
from='kingrichard@royalty.england.lit/throne'
|
|
id='richard2-4.1.247'
|
|
to='northumberland@shakespeare.lit/westminster'>
|
|
<amp xmlns='http://jabber.org/protocol/amp' status='notify'>
|
|
<rule condition='receipt' action='notify' value='received'/>
|
|
</amp>
|
|
</message>
|
|
]]></example>
|
|
<p>If the recipient does not meet all of the foregoing criteria, it MUST NOT return a receipt and MUST NOT return an error.</p>
|
|
</section1>
|
|
<section1 topic='Business Rules' anchor='rules'>
|
|
<p>The general business rules specified for Advanced Message Processing in <cite>XEP-0079</cite> apply to any rule; in addition, the following business rules apply specifically to the receipt rule:</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>
|
|
</ol>
|
|
<p>Naturally, the receipt rule can be combined wiith rules specified in <cite>XEP-0079</cite> (e.g., the deliver rule) for more complete reporting.</p>
|
|
</section1>
|
|
<section1 topic='Service Discovery' anchor='disco'>
|
|
<p>If a sender wishes to request message receipts, it SHOULD first discover whether the intended recipient supports message receipts. Support can be discovered indirectly via <cite>Entity Capabilities</cite> or directly via <cite>Service Discovery</cite>.</p>
|
|
<p>If an entity supports Advanced Message Processing, it MUST report that by including a service discovery feature of "http://jabber.org/protocol/amp" as described in <cite>XEP-0079</cite>:</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='http://jabber.org/protocol/amp'/>
|
|
...
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
<p>An entity that supports Advanced Message Processing SHOULD also maintain a service discovery node named "http://jabber.org/protocol/amp", at which it advertises the individual actions and conditions it supports. If an entity supports message receipts, it SHOULD respond to service discovery information requests sent to that node with a reply that includes the 'http://jabber.org/protocol/amp?condition=receipt' condition:</p>
|
|
<example caption="Request for information about individual actions and conditions"><![CDATA[
|
|
<iq from='northumberland@shakespeare.lit/westminster'
|
|
to='kingrichard@royalty.england.lit/throne'
|
|
type='get'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'
|
|
node='http://jabber.org/protocol/amp'/>
|
|
</iq>
|
|
]]></example>
|
|
<example caption="Response for individual actions and conditions"><![CDATA[
|
|
<iq from='kingrichard@royalty.england.lit/throne'
|
|
to='northumberland@shakespeare.lit/westminster'
|
|
type='result'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'
|
|
node='http://jabber.org/protocol/amp'>
|
|
...
|
|
<feature var='http://jabber.org/protocol/amp?condition=receipt'/>
|
|
...
|
|
</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>Chat Session Negotiation</cite>. The parameter to be negotiated is named "http://jabber.org/protocol/amp?condition=receipt". 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>http://jabber.org/protocol/chatneg</value>
|
|
</field>
|
|
<field label='Accept this chat?'
|
|
type='boolean'
|
|
var='accept'>
|
|
<value>true</value>
|
|
<required/>
|
|
</field>
|
|
<field label='Enable Message Receipts?'
|
|
type='boolean'
|
|
var='http://jabber.org/protocol/amp?condition=receipt'>
|
|
<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>http://jabber.org/protocol/chatneg</value>
|
|
</field>
|
|
<field var='accept'>
|
|
<value>true</value>
|
|
</field>
|
|
<field var='http://jabber.org/protocol/amp?condition=receipt'>
|
|
<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='Rule Conditions Registry' anchor='registrar-conditions'>
|
|
<p>The ®ISTRAR; maintains a registry of Advanced Message Processing <rule/> conditions (see &CONDITIONS;). The Registrar shall add the following condition to the registry:</p>
|
|
<code><![CDATA[
|
|
<condition>
|
|
<name>receipt</name>
|
|
<ns>http://jabber.org/protocol/amp?condition=receipt</ns>
|
|
<per-hop>false</per-hop>
|
|
<value>received</value>
|
|
<processing>
|
|
The condition is met if a message processing application (client)
|
|
controlled by the intended recipient has received and processed
|
|
the message, including presentation to a human user if appropriate.
|
|
</processing>
|
|
<doc>XEP-xxxx</doc>
|
|
</condition>
|
|
]]></code>
|
|
</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 Chat Session Negotiation forms:</p>
|
|
<code caption='Registry Submission'><![CDATA[
|
|
<form_type>
|
|
<name>http://jabber.org/protocol/chatneg</name>
|
|
<field
|
|
var='http://jabber.org/protocol/amp?condition=receipt'
|
|
type='boolean'
|
|
label='Whether to enable Message Receipts per XEP-0184'/>
|
|
</form_type>
|
|
]]></code>
|
|
</section2>
|
|
</section1>
|
|
<section1 topic='Acknowledgements' anchor='ack'>
|
|
<p>Thanks to Joe Kemp and Kevin Smith for their input.</p>
|
|
</section1>
|
|
</xep>
|