Google Authentication API: How to get the user's gmail address

Question

I've been studying the Google authentication API (AuthSub)... My question is, how do I get the user's account information (at least their Gmail address) after the authentication has passed?

Because currently, all I get back from the authentication process is a token granting me access to which ever Google service I have specified in the scope, but there's no easy way to even get the user's login id (Gmail address) as far as I can tell...

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If so, what Google service allows me to access the user's information?

Answer 1

Google Authentication API is a token based system to authenticate a valid user. It does not expose any of other interface that allows to get account holder information back to authorizer.

Answer 2

Using the Google AppEngine GData services, you can request the user to give you access to their Google Mail, Calendar, Picasa, etc. Check it out here.

Answer 3

You can get some of the data through the OpenID API, with the ax extension. If you are authenticating with other methods, best I found is calling https://www-opensocial.googleusercontent.com/api/people/@me/@self and it will get you name, email and picture. Be sure to have http://www-opensocial.googleusercontent.com/api in scopes when authenticating.