public function action_login()
 {
     $action = \Fuel\Core\Input::get('action');

     if ($action === null)
     {
         $success = \Evernote\Evernote::getTemporaryCredentials();
         if ($success) {
             \Fuel\Core\Response::redirect(\Evernote\Evernote::getAuthorizationUrl(\Fuel\Core\Session::get('requestToken')));
         }
     }
     elseif ($action === 'callback')
     {
         if (\Evernote\Evernote::handleCallback())
         {
             $credentials = \Evernote\Evernote::getTokenCredentials();
             if ($credentials['status'] === 'success') {
                 \Fuel\Core\Session::set('access_token', $credentials['access_token']);
                 \Fuel\Core\Session::set('access_token_secret', $credentials['access_tokenSecret']);
                 \Fuel\Core\Session::set('shard_id', $credentials['shard_id']);
                 \Fuel\Core\Session::set('user_id', $credentials['user_id']);
             }
         }

         \Fuel\Core\Response::redirect('index');
     }
 }