public string PrepareAuthRequest(PrepareAuthenticationContext context)
{
var authorization =
googleConsumer.ProcessUserAuthorization();
var callback =
new Uri(Utils.GetUrlBase(context.Request) + context.RedirectPath);
if (authorization == null)
{
return
(googleConsumer
.PrepareRequestUserAuthorization(returnTo: callback,
scopes:
new[] { "https://www.googleapis.com/auth/userinfo.profile" })
.Headers["Location"]);
}
return(null);
}