Using OAuth as Rails webapp API authentication?

I'm attempting to build up an API around a fairly simple concept: a User has many Locations. The locations have CRUD operations exposed via JSON and XML. There is no HTML view to this web service.

There is a completely separate website that will use my API via JavaScript and AJAX calls (in addition to mobile clients on smartphones) to manipulate a user's locations. I'd love to use two-legged OAuth to expose the user's locations as a Provider for authentication.

Are there any Rails plugins that would make this fairly easy (OAuth + authlogic don't seem to implemen开发者_如何转开发t two-legged OAuth or even a Provider) or do I need to implement it myself?

---

Here's a link, about a year old, should get you in the right direction:

http://stakeventures.com/articles/2007/11/26/how-to-turn-your-rails-site-into-an-oauth-provider