Re: [Standards] Answering directed probe
Old thread alert! On 9/18/11 9:48 PM, Justin Karneges wrote: On Sunday, September 18, 2011 09:19:54 AM Tomasz Sterna wrote: Quoting from RFC6121: 4.3.2. Server Processing of Inbound Presence Probe If there is a resource matching the full JID and the probing entity has authorization via a presence subscription to see the contact's presence, then the server MUST return an available presence notification, which SHOULD communicate only the fact that the resource is available (not detailed information such as the show/, status/, priority/, or presence extensions). May I ask what is the rationale behind this? Why the server should not answer with the presence stanza of the probed resource? I believe this is to ensure consistency with section 4.6.6. Basically, if you are probing a full JID then it means you're checking on a known session. Whether the user is in your roster (4.3.2) or not (4.6.6), the response should be the same. The meaning of these empty presence stanzas is a little funky. I think it's supposed to mean the presence is unchanged since the last one sent. As far as I can tell this conflicts with the fact that an empty presence stanza already has meaning (online) but perhaps in most modern client implementations there is at least some other element like c in there to ensure distinction. At the time of writing RFC 6121, we thought there was a good reason for the empty presence stanza (essentially: yep, that resource is still online), but now I'm not so sure. Something to revisit when working on 6121bis. :) Peter -- Peter Saint-Andre https://stpeter.im/
[Standards] Answering directed probe
Quoting from RFC6121: 4.3.2. Server Processing of Inbound Presence Probe If there is a resource matching the full JID and the probing entity has authorization via a presence subscription to see the contact's presence, then the server MUST return an available presence notification, which SHOULD communicate only the fact that the resource is available (not detailed information such as the show/, status/, priority/, or presence extensions). May I ask what is the rationale behind this? Why the server should not answer with the presence stanza of the probed resource? -- Tomasz Sterna Instant Messaging Consultant : Open Source Developer http://tomasz.sterna.tv/ http://www.xiaoka.com/portfolio
Re: [Standards] Answering directed probe
On Sunday, September 18, 2011 09:19:54 AM Tomasz Sterna wrote: Quoting from RFC6121: 4.3.2. Server Processing of Inbound Presence Probe If there is a resource matching the full JID and the probing entity has authorization via a presence subscription to see the contact's presence, then the server MUST return an available presence notification, which SHOULD communicate only the fact that the resource is available (not detailed information such as the show/, status/, priority/, or presence extensions). May I ask what is the rationale behind this? Why the server should not answer with the presence stanza of the probed resource? I believe this is to ensure consistency with section 4.6.6. Basically, if you are probing a full JID then it means you're checking on a known session. Whether the user is in your roster (4.3.2) or not (4.6.6), the response should be the same. The meaning of these empty presence stanzas is a little funky. I think it's supposed to mean the presence is unchanged since the last one sent. As far as I can tell this conflicts with the fact that an empty presence stanza already has meaning (online) but perhaps in most modern client implementations there is at least some other element like c in there to ensure distinction. Justin
