WARNING: This document has been automatically Deferred after 12 months of inactivity in its previous Experimental state. Implementation of the protocol described herein is not recommended for production systems. However, exploratory implementations are encouraged to resume the standards process.
4.1 Remote entity asks for permission to manage user's roster¶
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
If the presence subscription is absent, the server MUST NOT proceed with the request but MUST respond with the "forbidden" error:
The user's server SHOULD then generate a form request using Data Forms (XEP-0004)  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.
The client can answer by submit the form or with a text message response:
4.1.1 The remote entity is allowed to manage roster¶
If the user allowed the roster management then the server MUST inform the remote entity that it has been granted the permission:
4.1.2 The remote entity is allowed to manage roster¶
If the user disallowed the roster management then the server MUST inform the remote entity that it hasn't been granted the permission:
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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 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".