30 Sep
2010
30 Sep
'10
1:25 a.m.
On 9/29/10 11:38 PM, Iñaki Baz Castillo wrote:
--
Daniel-Constantin Mierla
http://www.asipto.com
2010/9/29 Daniel-Constantin
Mierla<miconda(a)gmail.com>om>:
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
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. 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.