[sr-dev] [SR-Users] Problem with xpath updates of XCAP documents

[Peter Dunkley]

Hi,

The full log helped me see what is going on.  Rather embarassingly it is
a Linux command line or curl error.  This command:

curl --digest -u 111:111 -T pidf_modify.xml -H "Content-Type:
application/xcap-el+xml" -X PUT
http://192.168.0.130:5060/xcap-root/pidf-manipulation/users/sip:111@multifon.ru/index~~/presence/tuple%5b@id='x8eg92n'%5d/note

doesn't work, but this command:

curl --digest -u 111:111 -T pidf_modify.xml -H "Content-Type:
application/xcap-el+xml" -X PUT
http://192.168.0.130:5060/xcap-root/pidf-manipulation/users/sip:111@multifon.ru/index~~/presence/tuple%5b@id=\'x8eg92n\'%5d/note

does.

Something was removing the ' characters from the URL.

Thanks,

Peter

On Wed, 2012-04-04 at 20:15 +0200, Daniel-Constantin Mierla wrote:

> Hello,
> 
> can you give the full log of such operation with debug=3? It may help
> seeing the values used internally for matching...
> 
> Otherwise, if it is a valid xpath condition and no match, then could
> be something to libxml2 implementation.
> 
> Cheers,
> Daniel
> 
> On 4/4/12 7:01 PM, Peter Dunkley wrote: 
> 
> > Hi,
> > 
> > I tried a simplified update URL with curl:  curl --digest -u 111:111
> > -T pidf_modify.xml -H "Content-Type: application/xcap-el+xml" -X PUT
> > http://192.168.0.130:5060/xcap-root/pidf-manipulation/users/sip:111@mydomain/index~~/presence/tuple/note
> > 
> > This "correctly" updated the <note/> nodes in both <tuple/> nodes of
> > the document.  So, the problem with the XCAP server appears to be
> > over the %5b at id='x8eg92n'%5d that is used to identify a specific
> > <tuple/> node.  I believe, from searching online, that this is valid
> > XPath syntax, so it does look like there is a bug here.
> > 
> > Any idea?
> > 
> > Thanks,
> > 
> > Peter
> > 
> > On Wed, 2012-04-04 at 17:19 +0100, Peter Dunkley wrote:
> > 
> > > Hi,
> > > 
> > > I have been experimenting with uploading, and modifying existing,
> > > XCAP documents.  I have been trying out the example from RFC 4827
> > > and I can't get it to work with Kamailio.
> > > 
> > > To upload the document (this works) I use the command: curl
> > > --digest -u 111:111 -T pidf.xml -X PUT
> > > http://192.168.0.130:5060/xcap-root/pidf-manipulation/users/sip:111@mydomain/index
> > > 
> > > To modify the document (this doesn't work) I use the command: curl
> > > --digest -u 111:111 -T pidf_modify.xml -H "Content-Type:
> > > application/xcap-el+xml" -X PUT
> > > http://192.168.0.130:5060/xcap-root/pidf-manipulation/users/sip:111@mydomain/index~~/presence/tuple%5b@id='x8eg92n'%5d/note
> > > 
> > > When I try to modify the document I get the error: "Apr  4
> > > 17:12:08 pd-laptop-linux kamailio[16862]: ERROR: xcap_server
> > > [xcap_server.c:596]: no new content"
> > > 
> > > I went through the XCAP server code and added some debug and found
> > > that the check on xcap_misc.c:491 is succeeding (which means "no
> > > selection for xpath parent expression") and the document is not
> > > being changed.  Also, from my limited understanding of XPath and
> > > libxml2, I would have expected the code path which should have
> > > been followed to go through the else clause of the conditional on
> > > xcap_misc.c:468 - which means I don't think that the
> > > xcaps_xpath_set() function is doing the right thing at all.
> > > 
> > > Is there anyone here that is more familiar with libxml2 that can
> > > give me any pointers here.  As far as I can tell the XCAP server
> > > code looks OK to me, and I believe the documents (attached) and my
> > > XCAP queries are correct as well.
> > > 
> > > Thanks,
> > > 
> > > Peter
> > > 
> > > _______________________________________________
> > > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> > > sr-users at lists.sip-router.org
> > > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> > > 
> > 
> > -- 
> > Peter Dunkley
> > Technical Director
> > Crocodile RCS Ltd
> > 
> > 
> > 
> > _______________________________________________
> > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> > sr-users at lists.sip-router.org
> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> 
> 
> 
> -- 
> Daniel-Constantin Mierla
> Kamailio Advanced Training, April 23-26, 2012, Berlin, Germany
> http://www.asipto.com/index.php/kamailio-advanced-training/


-- 
Peter Dunkley
Technical Director
Crocodile RCS Ltd
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