[Rails] Authentication for both web & api

Hello,

I need to develop an application which needs to authenticate user by
verifying login name/password for both web access and api. I need the
same controller to cater to both web and api. I can put the
before_filter for the controller to make sure that user is logged-in and
user_id is in session. But how do I design the controller that if the
request comes as a rest web service request then before filter should
not check session for logged user but should authenticate with
login/password passed as parameters with request and then should go
ahead whichever way the request came to controller.

I would really appreciate any code samples/links to sites which explain
how to do that.

Thanks.

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