Re: [xmpp] probe from/to

[Peter Saint-Andre <stpeter at stpeter.im>]

On 1/29/10 8:16 AM, Waqas Hussain wrote:
> On Fri, Jan 29, 2010 at 8:03 PM, Peter Saint-Andre <stpeter at stpeter.im
> <mailto:stpeter at stpeter.im>> wrote:
> 
>     On 1/29/10 3:37 AM, Waqas Hussain wrote:
> 
>     > There's another thing I was wondering about:
>     >
>     > For presence probes, "The value of the 'from' address MUST be the full
>     > JID <user at domain/resource> of the user and the value of the 'to'
>     address
>     > MUST be the bare JID <contact at domain> of the contact to which the user
>     > is subscribed."
>     >
>     > Why MUST those JIDs be that way? I can think of valid cases where
>     a bare
>     > JID may wish to probe the presence of a full JID.
> 
>     The original reasoning was that a user comes online with a particular
>     resource and my server sends a probe to the user's contacts (bare JID)
>     on behalf of that resource (full JID). I don't know what your use cases
>     are, so I'm not sure why we would change the logic we've had since 1999.
> 
> 
> I was concerned about presentities which are not users. If
> component.example.com <http://component.example.com> wishes to probe
> user at example.org <mailto:user at example.org>, MUST it send the probe from
> component.example.com/someresourcewhichisntactuallyusedforanythingelse
> <http://component.example.com/someresourcewhichisntactuallyusedforanythingelse>?
> 
> And there are valid cases where sending to a full JID would be the
> optimal solution. A MUC can use it to detect ghosts. And no, it doesn't
> have to poll every minute. If it has information about S2S for example,
> a smart implementation could just poll when it has detected that the
> remote server reconnected, restarted, etc, which is better than no ghost
> detection. The usual way to test for a ghost is to detect
> remote-host-not-found errors. And if you missed that (e.g., you didn't
> send any stanzas while the remote host rebooted), then is there any
> other way to detect ghosts which works with existing clients?
> 
> My only objection is that MUST is too forceful.

Yes. In fact we probably don't need to say anything at all, other than
that the probe must come from the JID of the entity on whose behalf
presence is being requested.

Peter

-- 
Peter Saint-Andre
https://stpeter.im/

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