Sometimes it is desirable for a client to indicate to a user that activity has occurred in a MUC, without the overhead of immediately joining every MUC that the user has an interest in.
A MUC may already send out-of-band notifications to users who are not currently joined if e.g. they are mentioned using References (XEP-0372) . However a MUC typically won't forward other kinds of messages unless the user is joined.
This protocol describes a lightweight mechanism for the client to display an indication to the user that there are new messages in a room since the last time the user was joined there. This can, for example, be used to provide a UI hint that a room the user is interested in has new unread activity.
This protocol explicitly does not attempt to define:
To inform the MUC service that you are interested in receiving activity indicators, send a presence to the service including the <rai> element:
After sending this presence, the service may send you activity indicator updates at any time, each one containing one or more JIDs of MUC rooms that have new messages:
Note that the service will **only** send notifications for rooms where the client's session is not currently joined. If the client is joined to a room, it already receives live events from the room directly.
A client may unsubscribe from activity indicators by sending an unavailable presence to the MUC service. This will typically be sent by the user's server automatically when they go offline.
Upon receiving a presence stanza addressed to the service JID that includes a <rai xmlns="urn:xmpp:rai:0"> element, the service should build a list of rooms where activity has occurred since the client was last in the room, and send them in a single notification.
When activity happens in a room, a service should send an activity notification to room members who have subscribed to notifications and who have not already received a notification for that room in their current subscription's lifetime.
A server SHOULD only send a single notification for each room where activity has occured since the last time a given affiliated user was joined to a room. Each room may only be notified once, even if many events occur while the client is not present in the room. Therefore the client MUST NOT attempt to count activity events. A single activity notification for a room means some unspecified number of events have happened, receiving another activity notification for the same room adds no further information.
A server MUST NOT send activity notifications to a user from a room that the user would not be allowed to join. This potentially includes hidden rooms where the user has no affiliation.
This specification does not dictate how a server determines which rooms a client should receive notifications for. The list may be large and varying.
For example, this information is available to the server through some other means, or a server may simply subscribe a user to all rooms on the MUC service, or only to rooms where a user has an affiliation.
This specification is not expected to introduce any security concerns.
From a privacy perspective, a user's availability is exposed to the MUC service, but not beyond what would be exposed if the user simply joined a room as normal.
Servers may place restrictions on who may subscribe to room activity notifications, e.g. by only serving local users, or only permitting a sensible number of active subscriptions.
Servers must be careful not to leak room activity indicators to users who would not otherwise have permission to view the content in the room.
This document requires no interaction with the Internet Assigned Numbers Authority (IANA) .
This document requires no interaction with XMPP Registrar .
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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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