AuthSub authentication for Google api

gistfile1.cs

public ActionResult Auth()
{
  const string scope = "https://www.google.com/analytics/feeds/";
  var next = Url.FullPath("~/home/authresponse");
  var url = AuthSubUtil.getRequestUrl(next, scope, false, true);
  return Redirect(url);
}

public ActionResult AuthResponse(string token)
{
  var sessionToken = AuthSubUtil.exchangeForSessionToken(token, null);
  Settings settings;
  using (RavenSession.Advanced.DocumentStore.DisableAggressiveCaching())
  {
    settings = RavenSession.Load<Settings>(Settings.DefaultId);
  }
  if (settings == null)
    settings = new Settings
    {
      Id = Settings.DefaultId
    };

  settings.SessionToken = sessionToken;
  RavenSession.Store(settings);

  return RedirectToAction("Config");
}