[Standards] XEP-280 and MUC private chats

Kevin Smith kevin at kismith.co.uk
Sun Jul 14 16:36:51 UTC 2013


On Sun, Jun 9, 2013 at 7:40 PM, Mathieu Pasquet <mathieui at mathieui.net> wrote:
> I was starting to implement carbons in poezio when I came across some
> kind of design issue that I haven’t been able to work out.
>
> As I understand it (and in the use case explained in the introduction),
> Carbons provide a way to minimize the nuisance of changing devices, by
> providing all the messages with 'chat' type to all the carbon-enabled
> clients.
>
> The requirements also state that “All clients that turn on the new
> protocol MUST be able to see all inbound chat-type messages”.
>
> However, in the case of private MUC messages (XEP-0045, 7.5), the
> messages are also of type 'chat', causing them to be forwarded as normal
> chat messages. But the other resources are not necessarily present on
> that MUC, so they will receive the messages just fine, as with any
> direct conversation with a fulljid, but they won’t be able to reply,
> because I believe most MUC implementations will check the fulljid and
> reply with an error.
>
> I can’t think of a straightforward solution to this issue, as the server
> doesn’t know about MUC, neither does the other resource.
>
> On the sender part, it might be solved by including a <private/> with
> each message sent through such chats, but on the receiving part, AFAIK
> there is no way to distinguish those.
>
> I think the XEP should cover that case, because it is rather common to
> have private conversations with people in a groupchat, and letting
> clients guess how they should handle the message is very error-prone.

Could you disco any unknown JIDs to see if they're users or MUCs?

/K



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