How can i get an users email id using Google Oauth2 Credentials of ‘Service Account’?

Question

How can I get an Google's user basic information using access token? Access token which is generated by an service account of Google. While I trying to get user info by using https://www.googleapis.com/oauth2/v1/userinfo?access_token=xxxx .. which is returning the service accounts email and service accounts id.. which does not returning the user's actual email id(anu@gmail.com) .. How can I get the user's actual email id( anu@gmail.com ) by this service accounts access token?

Thanks in advance....

Answer 1

Assuming it's a Google Apps account you want and the domain has granted your service account permission for the profile scope, you just need to use the sub= parameter to set the user you want an access token for. Then user profile calls will return data on the user instead of the service account. See delegating domain-wide authority .