This document defines a way for an entity that can initiate a Jingle (XEP-0166) [1] session (often for the purpose of file transfer as specified in Jingle File Transfer (XEP-0234) [2]) to advertise that session, thus enabling a receiver to then request initiation of the session by the sender. In essence, this document defines the Jingle equivalent of Publishing Stream Initiation Requests (XEP-0137) [3] (previously defined for Stream Initiation (XEP-0095) [4]).
A session owner uses the <jinglepub/> element to announce that it can initiate a specific Jingle session request. This element can be sent to a publish-subscribe node (see Publish-Subscribe (XEP-0060) [5] and Personal Eventing Protocol (XEP-0163) [6]), or sent directly to potential recipients within a <message/> stanza.
The format of the <jinglepub/> element is as follows:
<jinglepub xmlns='urn:xmpp:jinglepub:1'
from='sender-jid'
id='someid'>
[<uri/> element for an alternate or informational URI of the content]
[<meta/> element(s) for human-friendly information]
[<description/> element(s) for application format(s)]
</jinglepub>
The 'from' attribute MUST be present and MUST be the valid JID for the session owner.
The 'id' attribute is an opaque identifier, called the "jinglepub identifier". This attribute MUST be present, and MUST be a valid non-empty string. It uniquely identifies the published request at the session owner's JID.
The <jinglepub/> element MUST contain a <description/> element qualified by the namespace of the relevant Jingle application format (e.g., <description xmlns='urn:xmpp:jingle:apps:file-transfer:4'/> for file transfer).
The <jinglepub/> element MAY contain one or more <meta/> elements qualified by the jingle-pub namespace; if more than one element is included, each element MUST have a different value for the 'xml:lang' attribute.
The <jinglepub/> element MAY contain a <uri/> element which contains a URI for an alternative way to access the content, or other information about the content. The resource provided by the URI SHOULD be meaningful for clients that do not directly support the included Jingle content definitions, and accessing the URI MAY result in a different experience than initiating the published Jingle session. For example, the URI could be to a content landing page of an image hosting service from which an image could be viewed instead of directly downloading the image file.
The <jinglepub/> information is typically provided via pubsub.
The following example shows a possible payload for streaming of recorded audio/video sessions, here pushed out via PEP.
<iq from='bard@shakespeare.lit/globe' id='yhe51f39' type='set'>
<pubsub xmlns='http://jabber.org/protocol/pubsub'>
<publish node='scenes'>
<jinglepub xmlns='urn:xmpp:jinglepub:1'
from='bard@shakespeare.lit'
id='9559976B-3FBF-4E7E-B457-2DAA225972BB'>
<meta xml:lang='en'
title='Act III, Scene I of Hamlet'
summary='High-definition audio and video recording
for Act III, Scene I of Hamlet, captured
last week at the Globe Theatre, London.'/>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
</jinglepub>
</publish>
</pubsub>
</iq>
<message from='bard@shakespeare.lit' to='juliet@capulet.com/balcony'>
<event xmlns='http://jabber.org/protocol/pubsub#event'>
<items node='scenes'>
<item id='current'>
<jinglepub xmlns='urn:xmpp:jinglepub:1'
from='bard@shakespeare.lit'
id='9559976B-3FBF-4E7E-B457-2DAA225972BB'>
<meta xml:lang='en'
title='Act III, Scene I of Hamlet'
summary='High-definition audio and video recording
for Act III, Scene I of Hamlet, captured
last week at the Globe Theatre, London.'/>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
</jinglepub>
</item>
</items>
</event>
</message>
The <jinglepub/> element MAY also be included directly within a <message/> stanza sent to another entity (or multiple entities, e.g., in Multi-User Chat (XEP-0045) [7]). This can be especially useful for informing an offline entity about an available stream.
<message from='romeo@montague.net/pda' to='juliet@capulet.com'>
<jinglepub xmlns='urn:xmpp:jinglepub:1'
id='9559976B-3FBF-4E7E-B457-2DAA225972BB'>
<meta xml:lang='en'
title='Act III, Scene I of Hamlet'
summary='High-definition audio and video recording
for Act III, Scene I of Hamlet, captured
last week at the Globe Theatre, London.'/>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
</jinglepub>
</message>
In general, the process to trigger a stream initiation request is as follows:
Requester Publisher
| |
| <start/> |
|-------------------------->|
| <starting/> |
|<--------------------------|
| session-initiate |
|<--------------------------|
| [further jingle |
| negotiation] |
|<------------------------->|
| |A potential receiver requests initiation of the session by sending an IQ-get to the sender, using the <start xmlns='urn:xmpp:jinglepub:1'/> element. This element contains the 'id' attribute to specify which published stream to retrieve:
<iq type='get'
id='jinglepub-request-0'
from='juliet@capulet.com/balcony'
to='romeo@montague.net/pda'>
<start xmlns='urn:xmpp:jinglepub:1'
id='9559976B-3FBF-4E7E-B457-2DAA225972BB'/>
</iq>
If the sender accepts the request, it responds with an IQ-result containing a <starting/> element. This element indicates the session identifier to be used:
<iq type='result'
id='jinglepub-request-0'
from='romeo@montague.net/pda'
to='juliet@capulet.com/balcony'>
<starting xmlns='urn:xmpp:jinglepub:1'
sid='851ba2'/>
</iq>
Then the sender initiates the Jingle session:
<iq from='romeo@montague.lit/orchard'
id='nzu25s8'
to='juliet@capulet.lit/balcony'
type='set'>
<jingle xmlns='urn:xmpp:jingle:1'
action='session-initiate'
initiator='romeo@montague.lit/orchard'
sid='851ba2'>
<content creator='initiator' name='scene-audio'>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
<payload-type id='101' name='opus' clockrate='48000'>
<parameter name='stereo' value='1'/>
<parameter name='sprop-stereo' value='1'/>
</payload-type>
<payload-type id='97' name='speex' clockrate='8000'/>
<payload-type id='18' name='G729'/>
</description>
<transport xmlns='urn:xmpp:jingle:transports:ice-udp:1'>
<candidate component='1'
foundation='1'
generation='0'
id='or2ii2syr1'
ip='192.0.2.1'
network='0'
port='3478'
priority='2130706431'
protocol='udp'
type='host'/>
</transport>
</content>
<content creator='initiator' name='scene-video'>
<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='video'>
<payload-type id='98' name='theora' clockrate='90000'>
<parameter name='height' value='600'/>
<parameter name='width' value='800'/>
<parameter name='delivery-method' value='inline'/>
<parameter name='configuration' value='somebase16string'/>
<parameter name='sampling' value='YCbCr-4:2:2'/>
</payload-type>
<payload-type id='28' name='nv' clockrate='90000'/>
<payload-type id='25' name='CelB' clockrate='90000'/>
<payload-type id='32' name='MPV' clockrate='90000'/>
<bandwidth type='AS'>128</bandwidth>
</description>
<transport xmlns='urn:xmpp:jingle:transports:ice-udp:1'/>
</content>
</jingle>
</iq>
If the requested identifier is not valid, the sender SHOULD respond with a <not-acceptable/> error:
<iq type='error'
id='jinglepub-set-1'
from='romeo@montague.net/pda'
to='juliet@capulet.com/balcony'>
<start xmlns='urn:xmpp:jinglepub:1'>9559976B-3FBF-4E7E-B457-2DAA225972BB</start>
<error code='405' type='modify'>
<not-acceptable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
</error>
</iq>
If the receiver does not have permission to request the data stream, the sender SHOULD respond with a <forbidden/> error:
<iq type='error'
id='jinglepub-set-1'
from='romeo@montague.net/pda'
to='juliet@capulet.com/balcony'>
<start xmlns='urn:xmpp:jinglepub:1'>9559976B-3FBF-4E7E-B457-2DAA225972BB</start>
<error code='403' type='auth'>
<forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
</error>
</iq>
This document defines the 'jingle' XMPP URI/IRI querytype, which MUST posses an 'id' key/value pair, whose value is the "jinglepub identifier".
xmpp:files.montague.net?jingle;id=9559976B-3FBF-4E7E-B457-2DAA225972BB
The information found in such an URI, an XMPP address and a "jinglepub identifier", can be used to trigger an an Jingle session initation request as specified in § 2.2. This Jingle session can be used to transfer files (Jingle File Transfer (XEP-0234) [2]), audio and video streams (Jingle RTP Sessions (XEP-0167) [8]) and other Jingle application formats.
This document introduces no security concerns beyond those specified in XEP-0060 and the relevant Jingle application format in use.
This document requires no interaction with the Internet Assigned Numbers Authority (IANA) [9].
The XMPP Registrar [10] will be requested to include 'urn:xmpp:jinglepub:1' in its registry of protocol namespaces.
As authorized by XMPP URI Query Components (XEP-0147) [11], the XMPP Registrar maintains a registry of queries and key-value pairs for use in XMPP URIs (see <https://xmpp.org/registrar/querytypes.html>).The following submission registers the 'jingle' querytype.
<querytype>
<name>jingle</name>
<proto>urn:xmpp:jinglepub:1</proto>
<desc>enables retrieving Jingle sessions (file transfer, etc.)</desc>
<doc>XEP-0358</doc>
<keys/>
<key>
<name>id</name>
<desc>The 'jinglepub' identifier</desc>
</key>
<keys/>
</querytype>
<?xml version='1.0' encoding='UTF-8'?>
<xs:schema
xmlns:xs='http://www.w3.org/2001/XMLSchema'
xmlns:xml='http://www.w3.org/XML/1998/namespace'
targetNamespace='urn:xmpp:jinglepub:1'
xmlns='urn:xmpp:jinglepub:1'
elementFormDefault='qualified'>
<xs:element name='jinglepub'>
<xs:complexType>
<xs:all>
<xs:any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
<xs:element name='meta' type='metaElementType' minOccurs='0' maxOccurs='unbounded' />
<xs:element name='uri' type='xs:anyURI' minOccurs='0' maxOccurs='1' />
</xs:all>
<xs:attribute name='description' type='xs:string' use='optional'/>
<xs:attribute name='from' type='xs:string' use='required'/>
<xs:attribute name='id' type='xs:string' use='required'/>
<xs:attribute name='title' type='xs:string' use='optional'/>
</xs:complexType>
</xs:element>
<xs:complexType name='metaElementType'>
<xs:simpleContent>
<xs:extension base='empty'>
<xs:attribute name='summary'
type='xs:string'
use='optional'/>
<xs:attribute name='title'
type='xs:string'
use='required'/>
<xs:attribute ref='xml:lang' use='optional'/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:element name='start'>
<xs:complexType>
<xs:attribute name='id' type='xs:string' use='required'/>
</xs:complexType>
</xs:element>
<xs:element name='starting'>
<xs:complexType>
<xs:attribute name='sid' type='xs:string' use='required'/>
</xs:complexType>
</xs:element>
</xs:schema>
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The Extensible Messaging and Presence Protocol (XMPP) is defined in the XMPP Core (RFC 6120) and XMPP IM (RFC 6121) specifications contributed by the XMPP Standards Foundation to the Internet Standards Process, which is managed by the Internet Engineering Task Force in accordance with RFC 2026. Any protocol defined in this document has been developed outside the Internet Standards Process and is to be understood as an extension to XMPP rather than as an evolution, development, or modification of XMPP itself.
The primary venue for discussion of XMPP Extension Protocols is the <standards@xmpp.org> discussion list.
Discussion on other xmpp.org discussion lists might also be appropriate; see <http://xmpp.org/about/discuss.shtml> for a complete list.
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The following requirements keywords as used in this document are to be interpreted as described in RFC 2119: "MUST", "SHALL", "REQUIRED"; "MUST NOT", "SHALL NOT"; "SHOULD", "RECOMMENDED"; "SHOULD NOT", "NOT RECOMMENDED"; "MAY", "OPTIONAL".
1. XEP-0166: Jingle <https://xmpp.org/extensions/xep-0166.html>.
2. XEP-0234: Jingle File Transfer <https://xmpp.org/extensions/xep-0234.html>.
3. XEP-0137: Publishing Stream Initiation Requests <https://xmpp.org/extensions/xep-0137.html>.
4. XEP-0095: Stream Initiation <https://xmpp.org/extensions/xep-0095.html>.
5. XEP-0060: Publish-Subscribe <https://xmpp.org/extensions/xep-0060.html>.
6. XEP-0163: Personal Eventing Protocol <https://xmpp.org/extensions/xep-0163.html>.
7. XEP-0045: Multi-User Chat <https://xmpp.org/extensions/xep-0045.html>.
8. XEP-0167: Jingle RTP Sessions <https://xmpp.org/extensions/xep-0167.html>.
9. The Internet Assigned Numbers Authority (IANA) is the central coordinator for the assignment of unique parameter values for Internet protocols, such as port numbers and URI schemes. For further information, see <http://www.iana.org/>.
10. The XMPP Registrar maintains a list of reserved protocol namespaces as well as registries of parameters used in the context of XMPP extension protocols approved by the XMPP Standards Foundation. For further information, see <https://xmpp.org/registrar/>.
11. XEP-0147: XMPP URI Query Components <https://xmpp.org/extensions/xep-0147.html>.
Note: Older versions of this specification might be available at http://xmpp.org/extensions/attic/
Add Jingle query type and XMPP registrar submission.
Add <uri/> element.
Initial published version approved by the XMPP Council.
END