What's the preferred way to perform user authentication and authorization in clojure?

I had a look at the 4clojure login code and I think it is pretty clear how the implementation works. Basically it is the traditional HTTP authentication. Post user/pwd in form to a URL, check username and password and update the session with the user info that can be used for further requests to check whether this session is for a valid logged in user.

For authentication, apart from the obvious "rolling your own", I found https://github.com/mattrepl/clj-oauth to work well if you want to use OAUTH (e.g. Via Twitter). Once you've acquired user information, storing it in some sort of session object (via ring-middleware-session or similar abstractions) seems to be the obvious thing to do.

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