ruby on rails - Getting offline_access to work with Facebook

Question

I am using Facebooker with Rails to connect my application to Facebook. I can direct the user through the authorization process and through the process of granting offline access to my application.

How do I actually go about accessing the information offline? Is there a way to request a session_key that does not expire that I can use at a later point, so long as the user has not revoked the permissions for my application on Facebook?

Any help greatly appreciated. Advice need not be rails specific.

Answer 1

Once you ask for, and are granted, offline access the session key you get in the HTTP POST parameters from Facebook (fb_sig_session_key) will have no expiry.

You can check you have such a key by checking the fb_sig_expires parameter, if this is "0" then the session key has no expiry.

If you have an auth_token then you can call getSession to get the session key and check the expires field:

var auth = _auth.getSession(AuthToken);
string sessionKey = auth.session_key;
long uid = auth.uid;
bool expires = auth.expires > 0;