GWT OAuth libraries

Hello all,
these days i've been playing with OAuth in java. I tried
http://code.google.com/p/oauth-signpost/ and it worked well on the
java server side. I tried integrating signpost with a GWT app but
found i have to delegate all OAuth work to servlets in the server
side .
I'm wondering if we can implement OAuth on client side only?
i'm aware of a javascript oauth library http://oauth.googlecode.com/svn/code/javascript/
( there might be more good js oauth libs definitely). However i
couldn't find any mature and powerful GWT OAuth library.
Google App Engine (GAE) has a OAuth service (http://code.google.com/
appengine/docs/java/oauth/overview.html) , but it is tightly coupled
to GAE platform and could not be used in GWT apps outside GAE
environment.

do you know of some good pure GWT OAuth libs?
thanks

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