Require Google to return email address as part of OAuth

Question

I am using OAuth to access Gmail with dotNetOAuth. How can I force Google to return user\'s email address as part of callback after authorization?

By default, Google

Answer 1

For getting the Email Id, you need to add the scope "https://wwww.googleapis.com/auth/userinfo.email"

Then you will get id_token in the response.

Response={
   "access_token" : "ya29.eAG__HY8KahJZN9VmangoliaV-Jn7hLtestkeys",
   "token_type" : "Bearer",
   "expires_in" : 3600,
   "id_token" : "id_token_from_server",
   "refresh_token" : "1/GIHTAdMo6zLVKCqNbA"
 }

Then use this id_token as below POST request:

https://www.googleapis.com/oauth2/v1/tokeninfo?id_token=id_token_from_server

And you will get response like below:

Response={
 "issuer": "accounts.google.com",
 "issued_to": "80780.apps.googleusercontent.com",
 "audience": "8078909.apps.googleusercontent.com",
 "user_id": "1118976557884",
 "expires_in": 3598,
 "issued_at": 1456353,
 "email": "emailId@gmail.com",
 "email_verified": true
}

Make sure you add "www" in the APIs as shown above...