freerange/oauth2-provider — pull request #27 by mandrews (2012-01-13 23:27:51+00:00)
Title: Add client_credentials grant type

Allows a client to use client_id and client_secret to obtain a non refreshable access token:
http://tools.ietf.org/html/draft-ietf-oauth-v2-15#section-4.4