WebFinger at Google

[Paul E. Jones]

Folks,

 

Google appears to have Webfinger enabled on some accounts, at least.  You
can see it with this:

curl http://gmail.com/.well-known/host-meta

 

That returns this:

 

<?xml version='1.0' encoding='UTF-8'?>

<!-- NOTE: this host-meta end-point is a pre-alpha work in progress.   Don't
rely on it. -->

<!-- Please follow the list at http://groups.google.com/group/webfinger -->

<XRD xmlns='http://docs.oasis-open.org/ns/xri/xrd-1.0' 

     xmlns:hm='http://host-meta.net/xrd/1.0'>

  <hm:Host xmlns='http://host-meta.net/xrd/1.0'>gmail.com</hm:Host>

  <Link rel='lrdd' 

        template='http://www.google.com/s2/webfinger/?q={uri}'>

    <Title>Resource Descriptor</Title>

  </Link>

</XRD>

 

Now, querying the LRDD URL like this:

curl http://www.google.com/s2/webfinger/?q=acct:<user>@gmail.com

 

will return an XRD document, one of whose members is this:

<Link rel='http://specs.openid.net/auth/2.0/provider'
href='http://www.google.com/profiles/<user>'/>

 

The href value might vary, but that's what it returned for my account.  What
concerns me is the link relation value:
http://specs.openid.net/auth/2.0/provider

 

Where did that come from?  The 2.0 spec defined two possible values:

http://specs.openid.net/auth/2.0/server

http://specs.openid.net/auth/2.0/signon

 

However, I cannot find the one Google is using defined anywhere, though I
did see it referenced here:

http://code.google.com/p/webfinger/source/browse/wiki/CommonLinkRelations.wi
ki?spec=svn22
<http://code.google.com/p/webfinger/source/browse/wiki/CommonLinkRelations.w
iki?spec=svn22&r=22> &r=22

 

Is this an error?  If not, can somebody point me to the correct
documentation?

 

If it is an error, what should the value be?

 

I had assumed that the most logical choice was
http://specs.openid.net/auth/2.0/signon, which is what I configured my
server to return.  I made that assumption based on looking at all of the
XRDS examples in the OpenID 2.0 spec.

 

Paul

 

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