On 9/29/10 11:38 PM, Iñaki Baz Castillo wrote:
2010/9/29 Daniel-Constantin Mierlamiconda@gmail.com:
does xcap-server already support oma pres-rules and resource-list or is it on the roadmap?
xcap server is just for storage and manipulation of xml xcap docs.
Unfortunatelly this is not entirely true. For example, the oma-icon XCAP application (storage of an icon in XML format) requires a lot of logic in the XCAP server, why?:
- Alice does a XCAP/HTMP PUT of his avatar/icon (a XCAP/XML document)
to the XCAP server.
- The Alice sends a PUBLISH (event "presence") to the presence server.
According to OMA specs, this PUBLISH can contain a<icon> element with a link to the XCAP/XML document, something like:
<icon>http://xcap.mydomain.org/org.openmobilealliance.pres-content/users/sip:alice@mydomain.com/oma_status-icon/index</icon>
- Bob is a watcher allowed by Alice for event "presence". Bob receives
the NOTIFY containing such<icon> link.
Bob then performs a XCAP/HTTP GET for that URL.
The XCAP server receives the GET from Bob and now, the XCAP server
MUST check if Bob is allwoed or not to see Alice's status. What does it *mean*? It means that the XCAP server MUST get the 'pres-rules' document of Alice and inspect if Bob is allowed or not. Such 'pres-rules' document could contain (MUST in OMA specs) an absolute HTTP reference to Alice's 'resource-lists' document (as permissions are based on sublists. Again, 'resource-lists' document can contain (or MUST in OMA specs) absolute HTTP references to the 'resource-lists' document itself (yes, with depth 3 or 4, *really*).
This means that the XCAP server MUST behave as a SIP presence server in order to allow or deny the icon of user B to user A. Painful? Yes.
Well, then this xcap server can do more than I expected so far, because it can behave like a presence server :-) since kamailio is a presence server.
You can check the authorization status for watchers in config, iirc, Juha added it: http://kamailio.org/docs/modules/devel/modules_k/presence.html#id2941538
So, when there is a query for someone's resources, you can check in the config if querying person is allowed to see presence of queried person.
Cheers, Daniel
Presence modules are able to deal with pres-rules, not sure to what extent the oma additions.
Read OMA-WP-PRS_1_1_Implementation_Guidelines-20081209-A.pdf and OMA-WP-XDM_1_1_Implementation_Guidelines-20081209-A.pdf.
There is clear how unclear the specs are. But basically, as I've said above, pres-rules document contains absolute HTTP links to resource-lists document, and resource-lists document contains absolute HTTP links to itself.
Regards.