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Eric Woods and Matthew Marum are implementing support for OAuth 2.0 in Apache Shindig. This article provides an overview of the implementation, including high level design, supported flows, common how-tos, a description descriptions of classes, and future considerations.
The OAuth 2.0 specification is here: http://tools.ietf.org/html/draft-ietf-oauth-v2-20#section-220
Note that the implementation is still evolving, so consider this design document to be a draft.
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