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

request OAuth scope to include the "Email Display Scope" https://www.googleapis.com/auth/userinfo.email

scope="http://www.google.com/m8/feeds/ https://www.googleapis.com/auth/userinfo.email"

Then use REST API like Hammock to get address

            RestClient client = new RestClient
            {
                Authority = "https://www.googleapis.com",
            };

            RestRequest request = new RestRequest
            {
                Path = "userinfo/email?alt=json",
                Credentials = OAuthCredentials.ForProtectedResource(
                     this.requestSettings.ConsumerKey,
                     this.requestSettings.ConsumerSecret,
                     this.requestSettings.Token,
                     this.requestSettings.TokenSecret)
            };

            var response = client.Request(request);