CODEWITHSUNDEEP
xmppejabberdxmppframework
akhileshnair
akhileshnair

Reputation: 1503

How to send notifications to an offline member deleted from a chat group?

I am new to XMPP and working on a group chat application similar to watsapp. The scenario is:

"User A creates a group chat adding users B, C and D to it. All members are online and they are chatting. Now D takes the app to background or kills the app. Now A removes D from the group. How user D will be notified that A has removed him from the group, when D comes back to the app ?

I am using ejabberd (15.11) with PostgreSQL and following the XMPP architecture. I am not sure if the answer is out there, so would like to get help here.

Upvotes: 1

Views: 249

Answers (1)

Mickaël Rémond
Mickaël Rémond

Reputation: 9055

XMPP MUC specifications says in section 9.5: Modifying the Member List:

If a removed member is currently in a members-only room, the service SHOULD kick the occupant by changing the removed member's role to "none" and send appropriate presence to the removed member as previously described. The service MUST subsequently refuse entry to the user.

It means that the participant will only receive his own status change modification if it is present it the room when the event happen. If he is not online at that time, he can only know his credentials has been removed, because he cannot join the room anymore. In other words, in the current state of the specifications, there is no way to get that removal notification when user was not in the room when the removal happened. You can just infer he was removed because he cannot join the room again on next login.

There is nothing else defined in XEP-0045 Multi-User Chat to store membership event for offline participant and later delivery.

Upvotes: 2

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