This specification describes a protocol for a server to allow a client to configure a user's message archiving preferences. It is intended to be used in conjunction with Message Archive Management (XEP-0313) .
After observing XEP-0313 usage in the wild, it became apparent that preferences were not often used, and can interfere with clients that use the archive for synchronization of messages received by the user while disconnected. Therefore it is not actively encouraged for an implementation/deployment to offer this functionality.
Depending on implementation and deployment policies, a server MAY allow the user to have control over the server's archiving behaviour. This specification defines a basic protocol for this, and also allows a server to offer more advanced configuration to a user.
If the server supports and allows configuration of the preferences described below then it SHOULD implement the protocol defined in this section. This allows the user to retrieve and configure the following preferences:
The server replies with the user's current archiving preferences. The <prefs> element MUST be present and contain the current default archiving policy. The <always> and <never> MUST also be present (even if empty), and contain a list of JIDs enclosed in <jid> elements.
To update the preferences, the client can simply send an iq stanza with a type of 'set':
The server then replies with the applied preferences (note that due to server policies these MAY be different to the preferences sent by the client):
It is also possible for the server to respond with an error, for example (but not limited to) the standard 'feature-not-implemented' (the server does not support configuration of preferences), 'forbidden' (the user is not authorized to change their preferences) or 'not-allowed' (the server generally does not allow changing of configuration preferences).
If a JID is in neither the 'always archive' nor the 'never archive' list then whether it is archived depends on this setting, the default.
The 'default' attribute of the 'prefs' element MUST be one of the following values:
The <prefs/> element MAY contain an <always/> child element. If present, it contains a list of <jid/> elements, each containing a single JID. The server SHOULD archive any messages to/from this JID (see 'JID matching').
If missing from the preferences, <always/> SHOULD be assumed by the server to be an empty list.
The <prefs/> element MAY contain an <never/> child element. If present, it contains a list of <jid/> elements, each containing a single JID. The server SHOULD NOT archive any messages to/from this JID (see 'JID matching').
If missing from the preferences, <never/> SHOULD be assumed by the server to be an empty list.
In addition to this protocol, a server MAY offer more advanced configuration to the user through Ad-Hoc Commands (XEP-0050) . Such an interface might, for example, allow the user to configure what types of messages to store, or set a limit on how long messages should remain in the archive.
If supported, such a configuration command SHOULD be presented on the well-defined command node of "urn:xmpp:mam#configure".
When comparing the message target JID against the user's roster (ie. when the user has set default='roster') the comparison MUST use the bare target JID (that is, stripped of any resource).
For matching against entries in either the 'allow' or 'never' lists, for each listed JID:
For outgoing messages, the server MUST use the value of the 'to' attribute as the target JID.
For incoming messages, the server MUST use the value of the 'from' attribute as the target JID.
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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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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".
Note: Older versions of this specification might be available at http://xmpp.org/extensions/attic/
Split from XEP-0313, no protocol changes