OpenID: Trying to Get Email Address from Google OP

Question

I’m using dotnetopenauth 3.2 to implement Openid and can’t figure out how to get Google to pass the email address in the Claims Response. I know that Google doesn’t support simple registration, but I can’t determine what they do support.

Caveat to this question is that I just started learning OpenID and I know I don’t have a solid grasp on the specification which I think is leading to my confusion.

Any help would be appreciated!

Answer 1

Ok figured it out. I posted a question on Goolge's Federated Log API group http://groups.google.com/group/google-federated-login-api/browse%5Fthread/thread/5521cae736698091# and was told to use Attribute exchange. Below is the code for Dotnetopenauth.

Please don't use this code in production! for illustration purposes only

//The Request
 using (OpenIdRelyingParty openid = new OpenIdRelyingParty())
 {
   IAuthenticationRequest request = openid.CreateRequest(openidurl);

    var fetch = new FetchRequest();
    fetch.Attributes.AddRequired(WellKnownAttributes.Contact.Email);
    request.AddExtension(fetch);

    // Send your visitor to their Provider for authentication.
    request.RedirectToProvider();
 }


//The Response
 OpenIdRelyingParty openid = new OpenIdRelyingParty();
 var response = openid.GetResponse();
 if (response != null)
 {
         switch (response.Status)
         {
             case AuthenticationStatus.Authenticated:

             var fetch = response.GetExtension<FetchResponse>();
             string email = string.Empty(); 
             if (fetch != null)
             {
                email =  fetch.GetAttributeValue(WellKnownAttributes.Contact.Email)
             }  

             FormsAuthentication.RedirectFromLoginPage(response.ClaimedIdentifier, false);
          break;
          }
}

Answer 2

Did you by any chance try to retrieve the country field? I've tried both

ClaimsRequest { Country = DemandLevel.Require }

and

FetchRequest fetchRequest = new FetchRequest(); fetchRequest.Attributes.AddRequired(WellKnownAttributes.Contact.HomeAddress.Country); fetchRequest.Attributes.AddRequired(WellKnownAttributes.Contact.WorkAddress.Country);

without any luck.

Thanks