[Standards] UPDATED: XEP-0280 (Message Carbons)

Matthew A. Miller linuxwolf at outer-planes.net
Mon Jul 11 14:18:47 UTC 2011

On Jul 11, 2011, at 04:15 , Kevin Smith wrote:

> On Sun, Jul 10, 2011 at 9:15 PM, XMPP Extensions Editor <editor at xmpp.org> wrote:
>> Version 0.2 of XEP-0280 (Message Carbons) has been released.
>> Abstract: In order to keep all IM clients for a user engaged in a conversation, outbound messages are carbon-copied to all interested resources.
>> Changelog: Changed enabling and disabling to use separate elements rather than attributes; ensured all elements in the examples have their namespaces more explicitly defined; used message forwarding for carbon copies. (mm)
>> Diff: http://xmpp.org/extensions/diff/api/xep/0280/diff/0.1/vs/0.2
>> URL: http://xmpp.org/extensions/xep-0280.html
> I think:
> "The wrapping message SHOULD maintain the same 'type', 'from', and
> 'id' attribute values (if any), while the 'to' attribute SHOULD be the
> full JID of the resource receiving the copy."
> isn't right. The encapsulated message already has these data available
> - the encapsulating message should have attributes that reflect who is
> really sending/receiving the stanza (i.e. to=the client receiving the
> carbon, from=the server or the bare JID, unique id).

I don't quite agree with you; I think there should be some corroborating information between the wrapped and wrapping message, especially with one of the addresses ('from' seems the least routing-intesive here).  The id can be relaxed, although I think keeping the type is worthwhile ("normal" and "headline" don't seem right here).

I may be paranoia on my part, but I don't want to implicitly trust any <forwarded/> that I get.  Granted, nothing is guaranteed here without digitally signing, but correlating at least one address seems better than nothing at all.

- m&m

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