[Pharo-users] HTTP Token Based authentication server?

Is it there any implementation for token based authentication over HTTP? I know there is a OAuth client, but do we have an OAuth server? I'm migrating the authentication of our mobile apps from standard HTTP digest (user/pass base64 encoded) to token based auth, and could find very useful to have something already done to use or to build on top of. Regards! Esteban A. Maringolo