It's often desirable for some XMPP based services to make it possible to manage user's roster to provide some contacts there. The most obvious example of such kind of service is a gateway to some legacy IM system (see Gateway Interaction (XEP-0100) [1]). The current way that's recommended by the Gateway Interaction (XEP-0100) [1] is to use the Roster Item Exchange (XEP-0144) [2] to synchronize items that's not sutiable in certain situations.
This document addresses the following requirements:
In order to be able to make any changes to the user's roster the remote entity MUST ask permission to do so first.
NOTE: in order to be able to perform the query, the remote entity MUST have a presence subscription to the User
<iq from='icq.example.com' to='juliet@example.com' type='set' id='roster_1'> <query xmlns='urn:xmpp:tmp:roster-management:0' reason='Manage contacts in the ICQ contact list' type='request'/> </iq>
If the presence subscription is absent, the server MUST NOT proceed with the request but MUST respond with the "forbidden" error:
<iq from='juliet@example.com' to='icq.example.com' type='error' id='roster_1'>
<error type='modify'>
<forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
<text xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'>You must have a presence subscription to be able to request remote roster management service.</text>
</error>
</iq>The user's server SHOULD then generate a form request using Data Forms (XEP-0004) [4] to client in order to ask user if they are OK with granting the permission to the remote entity. The "challenge" form field is generated by the server and is used to identify the client's response. The server also MUST immediatly answer to the request IQ.
NOTE: if the entity is already granted with the permission, the server SHOULD immediatly answer with a success response and skip querying the user.
<message from='example.com'
to='juliet@example.com'>
<body>icq.example.com wants to be able to manage your roster with following reason:
Manage contacts in the ICQ contact list
Do you want to allow it? Send "yes 5439123" or "no 5439123" back, pleas.</body>
<x xmlns='jabber:x:data' type='form'>
<title>Roster management permission request</title>
<instructions>icq.example.com wants to be able to manage your roster with following reason:
Manage contacts in the ICQ contact list.
Do you allow it?</instructions>
<field type='hidden' var='challenge'><value>5439123</value></field>
<field type='hidden' var='FORM_TYPE'>
<value>urn:xmpp:tmp:roster-management:0</value>
</field>
<field type='boolean'
label='Allow icq.example.com to edit roster?'
var='answer'>
<value>1</value>
</field>
</x>
</message>The client can answer by submit the form or with a text message response:
<message from='juliet@example.com/home'
to='example.com'
xml:lang='en'>
<x xmlns='jabber:x:data' type='submit'>
<field var='FORM_TYPE'>
<value>urn:xmpp:tmp:roster-management:0</value>
</field>
<field var='challenge'><value>5439123</value></field>
<field var='answer'><value>1</value></field>
</x>
</message>
<message from='juliet@example.com/home'
to='example.com'
xml:lang='en'>
<body>yes 5439123</body>
</message>If the user allowed the roster management then the server MUST inform the remote entity that it has been granted the permission:
<iq from='juliet@example.com' to='icq.example.com' type='set' id='roster_2'> <query xmlns='urn:xmpp:tmp:roster-management:0' type="allowed"/> </iq>
If the user disallowed the roster management then the server MUST inform the remote entity that it hasn't been granted the permission:
<iq from='juliet@example.com' to='icq.example.com' type='set' id='roster_2'> <query xmlns='urn:xmpp:tmp:roster-management:0' type="rejected"/> </iq>
In order to reject the permission to manage roster it's enough to reject entity's presence subscription:
<presence to='icq.ecample.com' type='unsubscribed'/>
If the presence subscription is restored then the permission is needed to be rerequested as defined above.
The remote entity being granted the permission to manage roster can request it from the User's server using usual jabber:iq:roster protocol to be able to edit it:
<iq from='icq.example.com' to='juliet@example.com' type='get' id='roster_5'> <query xmlns='jabber:iq:roster'/> </iq>
The server MUST then answer with User's roster including there only the items that belongs to the entity's hostname:
<iq to='icq.exampel.com' from='juliet@example.com' type='result' id='roster_5'>
<query xmlns='jabber:iq:roster'>
<item jid='123456789@icq.example.com'
name='Romeo'
subscription='both'>
<group>Friends</group>
</item>
<item jid='554323654@icq.example.com'
name='Mercutio'
subscription='from'>
<group>Friends</group>
</item>
<item jid='997665667@icq.example.com'
name='Benvolio'
subscription='both'>
<group>Friends</group>
</item>
</query>
</iq>If client updates roster and this update affects the remote entity's contacts (i.e. belongs to its hostname) then the server MUST forward these items to the remote entity:
<iq from='juliet@example.com/chamber' type='set' id='roster_3'>
<query xmlns='jabber:iq:roster'>
<item jid='123456789@icq.example.net'
name='Romeo'
subscription='both'>
<group>Friends</group>
<group>Lovers</group>
</item>
</query>
</iq>
<iq from='juliet@example.com' to='icq.example.com' type='set' id='roster_3'>
<query xmlns='jabber:iq:roster'>
<item jid='123456789@icq.example.net'
name='Romeo'
subscription='both'>
<group>Friends</group>
<group>Lovers</group>
</item>
</query>
</iq>The remote entity can also send the push query to the roster with the same semantics as specified for the jabber:iq:roster protocol described in the RFC 6121 [3]:
<iq to='juliet@example.com' type='set' id='roster_3'>
<query xmlns='jabber:iq:roster'>
<item jid='123456789@icq.example.net'
name='Romeo'
subscription='both'>
<group>Friends</group>
<group>Lovers</group>
</item>
</query>
</iq>The server MUST then inform the remote entity of success or an error and in the case of success also forward the push request to all connected User's resources.
If the entity tries to make changes into the items it's not allowed to, the server MUST NOT do any changes in the User's roster but respond to the entity with an error:
<iq from='juliet@example.com' type='set' id='roster_3'> <forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/> <text xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'>You have tried to modify the item you don't allowed to.</text> </iq>
User can ask the server to provide a list of components or servers which have permissions to edit their roster.
<iq from='juliet@example.com/home' to='icq.example.com' type='get' id='roster_5'> <query xmlns='urn:xmpp:tmp:roster-management:0'/> </iq>
In this case, server responds with list of components or servers which can edit user's roster.
<iq from='juliet@example.com/home' to='icq.example.com' type='result' id='roster_5'>
<query xmlns='urn:xmpp:tmp:roster-management:0'>
<item jid='icq.example.com' reason='Manage ICQ contacts.'/>
<item jid='j2j.example.com' reason='Manage Jabber gateway contacts.'/>
</query>
</iq>
Eventually, user can reject permission granted to component to edit their roster.
<iq from='juliet@example.com/home' to='icq.example.com' type='set' id='roster_6'> <query xmlns='urn:xmpp:tmp:roster-management:0' type="reject"/> </iq>
<?xml version='1.0' encoding='UTF-8'?>
<xs:schema
xmlns:xs='http://www.w3.org/2001/XMLSchema'
targetNamespace='urn:xmpp:tmp:roster-management:0'
xmlns='urn:xmpp:tmp:roster-management:0'
elementFormDefault='qualified'>
<xs:annotation>
<xs:documentation>
The protocol documented by this schema is defined in
XEP-XXXX: http://www.xmpp.org/extensions/xep-xxxx.html
</xs:documentation>
</xs:annotation>
<xs:element name='query'>
<xs:complexType>
<xs:attribute name='type' use='required'>
<xs:simpleType base='xs:NMTOKEN'>
<xs:enumeration value='request'/>
<xs:enumeration value='allowed'/>
<xs:enumeration value='rejected'/>
</xs:simpleType>
</xs:attribute>
<xs:attribute name='reason' use='optional' type='xs:string'/>
<xs:sequence minOccurs='0'>
<xs:element ref='item' minOccurs='0' maxOccurs='unbounded'/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name='item'>
<xs:complexType>
<xs:simpleContent>
<xs:extension base='empty'>
<xs:attribute name='jid' type='fullJIDType' use='required'/>
<xs:attribute name='reason' type='xs:string' use='optional'/>
</xs:extension>
</xs:simpleContent>
</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.
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Errata can be sent to <editor@xmpp.org>.
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-0100: Gateway Interaction <https://xmpp.org/extensions/xep-0100.html>.
2. XEP-0144: Roster Item Exchange <https://xmpp.org/extensions/xep-0144.html>.
3. RFC 6121: Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence <http://tools.ietf.org/html/rfc6121>.
4. XEP-0004: Data Forms <https://xmpp.org/extensions/xep-0004.html>.
Note: Older versions of this specification might be available at https://xmpp.org/extensions/attic/
Initial published version approved by the XMPP Council.
First draft.
@report{dobrov2012xep0321,
title = {Remote Roster Management},
author = {Dobrov, Sergey and Kaluža, Jan},
type = {XEP},
number = {0321},
version = {0.1.1},
institution = {XMPP Standards Foundation},
url = {https://xmpp.org/extensions/xep-0321.html},
date = {2012-12-07/2018-11-03},
}END