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---++Yadis Overview

---+++What is Yadis?
Yadis is an authentication service discovery protocol allowing Compliant Clients (identity consumers or member-sites) to deductively determine authentication protocol options available from a service provider. 

---+++Why is Yadis important?
It enables authentication method discovery in loosely coupled distributed network environments such as the Web.

The Yadis specification provides: 

   * A general purpose identifier for individuals and other entities 
   * A resource description document for identifying services via identifiers 
   * A protocol for obtaining resource description document for local processing

---+++How Is Yadis implemented in ODS?
Every ODS dataspace user page provides Yadis compliant information.
Included in the head section of the user page is  (for example, for user <code>demo</code> at http://demo.openlinksw.com/ods/ ): 

<verbatim>
<link rel="openid.server" title="OpenID Server" href="http://demo.openlinksw.com/openid" />
<meta http-equiv="X-XRDS-Location" content="http://demo.openlinksw.com/dataspace/demo/yadis.xrds" />
<meta http-equiv="X-YADIS-Location" content="http://demo.openlinksw.com/dataspace/demo/yadis.xrds" />
</verbatim>

---+++How do I use Yadis?

The ODS Yadis URL is:

<verbatim>
http://host:port/dataspace/[your-ods-username]
</verbatim>

For example, for user <code>demo</code> at http://demo.openlinksw.com/ods/ --

<verbatim>
http://demo.openlinksw.com/dataspace/demo/
</verbatim>

---+++Interoperability

The ODS implementation of Yadis has been tested with a number of Yadis Compliant Clients. All tests were performed using our public [[http://demo.openlinksw.com/ods][ODS Demo Server]]

---+++++[[http://demoserver.leasystem.info/demo.exe/Check][leaSystem Yadis Check]]
Passed successfully.

<verbatim>
Yadis Check

InfoAgent found an XRDS using the X-XRDS-Location HTTP header.

OKThe XRDS document is valid!

Now try checking for a specific type identifier:

Your document looks like this (after being handled by my XML parser):

<xrds:XRDS xmlns:xrds="xri://$xrds" xmlns:openid="http://openid.net/xmlns/1.0" xmlns="xri://$xrd*($v*2.0)">
 <XRD>
  <Service priority="1">
   <Type>http://openid.net/signon/1.0</Type>
   <Type>http://openid.net/sreg/1.0</Type>
   <URI>http://demo.openlinksw.com/openid</URI>
   <openid:Delegate>http://demo.openlinksw.com/dataspace/demo</openid:Delegate>
  </Service>
 </XRD>
</xrds:XRDS>
</verbatim>

---++++[[http://netmesh.org/projects/yadis/][NetMesh Yadis area]]

Tested with the Perl Scripts provided by the url above.

   * Passed successfully.

---++++[[http://firstsso.netmesh.org/][NetMesh FirstSSO]]
   * [[http://firstsso.netmesh.org/infogrid-php/?lid=][NetMesh InfoGrid LID PHP implementation]]: Passed successfully.
   * [[http://firstsso.netmesh.org/infogrid-java/?lid=][NetMesh InfoGrid LID Java implementation]]: Passed successfully.
   * [[http://firstsso.netmesh.org/infogrid-perl/?lid=][NetMesh InfoGrid LID Perl implementation]]:
      * [[http://firstsso.netmesh.org/infogrid-perl/?lid=][The NetMesh's perl]] test page even fails with myopenid identity. It does not redirecting properly. Firefox has detected that the server is redirecting the request for this address in a way that will never complete. This problem can sometimes be caused by disabling or refusing to accept cookies.


---++++[[http://www.raschke.net/~kurt/txp_test/][txp_test]]

   * according to the notes from [[http://lists.danga.com/pipermail/yadis/2005-August/001370.html][OpenID support in Textpattern mailing list]], attempt to Login at the url below as user test, pwd 9xycp0 fails. Can not find way to authentication with OpenID, either.
<verbatim>
http://www.raschke.net/~kurt/txp_test/textpattern/
</verbatim> 
 
---+++Resources

   * [[http://yadis.org][Yadis Community Site]]
   * [[http://yadis.org/wiki/Yadis_Protocol_Draft_0.8][Yadis Protocol]]
   * [[http://yadis.org/wiki/Yadis_Services_Listing][Yadis Services Listing]]
   * [[http://yadis.org/wiki/Yadis_Online_Tools][Yadis Online Tools]]

CategoryODS CategoryYadis