[foaf-protocols] webid query at uriburner targeting a foaf.me card

Andreas Radinger andreas.radinger at ebusiness-unibw.org
Fri Mar 18 12:57:11 CET 2011


On 3/18/11 12:12 AM, Peter Williams wrote:
> using the uriburner query:
>
>     DEFINE get:soft "replace"
>     PREFIX cert: <http://www.w3.org/ns/auth/cert#>
>     PREFIX rsa: <http://www.w3.org/ns/auth/rsa#>
>     select  ?webid
>     FROM <http://foaf.me/pw2#me>
>     WHERE {
>     [] cert:identity ?webid ;
>     rsa:modulus ?m ;
>     rsa:public_exponent ?e .
>     ?m cert:hex
>     "BD4B4A4435D501EE874670E1017FABB08060C1CB3CE5B43D7F627CC4E0A21D243A4FD6890BCF723F39CA5F0A866E43400699146F47F699033C07C8E7CFB9066E851B5D8D2E7179A0DB2C1A59B7FC7CBE70AAB9D0D3A7F234DB9FCEF967AB8FB7932897C12CB074EDE215FECA0DF407F72336064E81D43F8301A994E2A0F4BACD"^^xsd:string
>     .
>     ?e cert:decimal "65537"^^xsd:string
>     }
>
> the foaf.me card at http://foaf.me/pw2#me has
>
>     *-* <http://foaf.me/pw2#><rdf:Description>
>     ** <rdf:type
>     rdf:resource="*http://www.w3.org/ns/auth/rsa#RSAPublicKey*"/>
>     ** <cert:identity rdf:resource="*#me*"/>
>     *-* <http://foaf.me/pw2#><rsa:modulusrdf:parseType="*Resource*">
>     ** <cert:hex>*bd 4b 4a 44 35 d5 01 ee 87 46 70 e1 01 7f ab b0 80
>     60 c1 cb 3c e5 b4 3d 7f 62 7c c4 e0 a2 1d 24 3a 4f d6 89 0b cf 72
>     3f 39 ca 5f 0a 86 6e 43 40 06 99 14 6f 47 f6 99 03 3c 07 c8 e7 cf
>     b9 06 6e 85 1b 5d 8d 2e 71 79 a0 db 2c 1a 59 b7 fc 7c be 70 aa b9
>     d0 d3 a7 f2 34 db 9f ce f9 67 ab 8f b7 93 28 97 c1 2c b0 74 ed e2
>     15 fe ca 0d f4 07 f7 23 36 06 4e 81 d4 3f 83 01 a9 94 e2 a0 f4 ba
>     cd*</cert:hex>
>     ** </rsa:modulus>
>     *-*
>     <http://foaf.me/pw2#><rsa:public_exponentrdf:parseType="*Resource*">
>     ** <cert:decimal>*65537*</cert:decimal>
>     ** </rsa:public_exponent>
>     ** </rdf:Description>
>
> what I'm hoping is that the uriburner agent will, given the 1 query 
> formula (into which I plugin mod/exp/uri from the client cert), talk 
> to both the webid wiki resource server and the foaf.me resource server.
> Logically, there is no difference in the triple sets (apart from 
> values) - though the wiki is using HTML/RDFa and foaf.me returns 
> RDF/XML. Do I have to know to put the hex in lower case, or something?
>
>     HTTP/1.1 200 OK
>     Date: Thu, 17 Mar 2011 22:53:54 GMT
>     Server: Apache/2.2.12 (Ubuntu)
>     X-Powered-By: PHP/5.2.10-2ubuntu6.4
>     MS-Author-Via: SPARQL
>     Content-Length: 1381
>     Keep-Alive: timeout=15, max=100
>     Connection: Keep-Alive
>     Content-Type: application/xml
>     X-Pad: avoid browser bug
>
>     <?xml version="1.0" encoding="ISO-8859-1"?>
>
> <rdf:RDF xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns#
> ...
>
> Summary. query get the right answer when working against the webid 
> wiki's triples, but same basic query doesnt seem to get the right 
> answer against the foaf.me resource.
>
>
> _______________________________________________
> foaf-protocols mailing list
> foaf-protocols at lists.foaf-project.org
> http://lists.foaf-project.org/mailman/listinfo/foaf-protocols
Hi,

the problem is that
a) the wiki page in RDFa at [1] use typed literals (xsd:string) and
b) the foaf.me resource in RDF at [2] use untyped literals
for the values of cert:hex and cert:decimal.

The correct query for a) is:
PREFIX cert: <http://www.w3.org/ns/auth/cert#>
PREFIX rsa: <http://www.w3.org/ns/auth/rsa#>
select  ?webid
FROM <http://webid.myxwiki.org/xwiki/bin/view/XWiki/homepw4>
WHERE {
[] cert:identity ?webid ;
rsa:modulus ?m ;
rsa:public_exponent ?e .
?m cert:hex 
"b520f38479f5803a7ab33233155eeef8ad4e1f575b603f7780f3f60ceab1\n34618fbe117539109c015c5f959b497e67c1a3b2c96e5f098bb0bf2a6597\n779d26f55fe8d320de7af0562fd2cd067dbc9d775b22fc06e63422717d00\na6801dedafd7b54a93c3f4e59538475673972e524f4ec2a3667d0e1ac856\nd532e32bf30cef8c1adc41718920568fbe9f793daeeaeeaa7e8367b7228a\n895a6cf94545a6f6286693277a1bc7750425ce6c35d570e89453117b88ce\n24206afd216a705ad08b7c59\n"^^xsd:string 
.
?e cert:decimal "65537"^^xsd:string .
}

The correct query for b) would be:
PREFIX cert: <http://www.w3.org/ns/auth/cert#>
PREFIX rsa: <http://www.w3.org/ns/auth/rsa#>
select  ?webid
FROM <http://foaf.me/pw2#me>
WHERE {
[] cert:identity ?webid ;
rsa:modulus ?m ;
rsa:public_exponent ?e .
?m cert:hex "bd 4b 4a 44 35 d5 01 ee 87 46 70 e1 01 7f ab b0 80 60 c1 cb 
3c e5 b4 3d 7f 62 7c c4 e0 a2 1d 24 3a 4f d6 89 0b cf 72 3f 39 ca 5f 0a 
86 6e 43 40 06 99 14 6f 47 f6 99 03 3c 07 c8 e7 cf b9 06 6e 85 1b 5d 8d 
2e 71 79 a0 db 2c 1a 59 b7 fc 7c be 70 aa b9 d0 d3 a7 f2 34 db 9f ce f9 
67 ab 8f b7 93 28 97 c1 2c b0 74 ed e2 15 fe ca 0d f4 07 f7 23 36 06 4e 
81 d4 3f 83 01 a9 94 e2 a0 f4 ba cd".
?e cert:decimal "65537".
}


[1] http://webid.myxwiki.org/xwiki/bin/view/XWiki/homepw4
[2] http://foaf.me/pw2

-- 
Best regards
Andreas Radinger


------------------------------------------
Dipl.-Ing. Andreas Radinger
Professur für Allgemeine BWL, insbesondere E-Business
e-business&  web science research group
Universität der Bundeswehr München

e-mail:andreas.radinger at unibw.de
phone:  +49-(0)89-6004-4218
fax:    +49-(0)89-6004-4620
www:http://www.unibw.de/ebusiness/
skype:  andreas.radinger


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