Gollem_Auth::getPreferredBackend PHP Method

    public static function getPreferredBackend()
    {
        if ($backend_key = $GLOBALS['session']->get('gollem', 'backend_key')) {
            return $backend_key;
        }
        /* Determine the preferred backend. */
        foreach (self::getBackend() as $key => $backend) {
            if (empty($backend_key) && substr($key, 0, 1) != '_') {
                $backend_key = $key;
            }
            if (empty($backend['preferred'])) {
                continue;
            }
            $preferred = is_array($backend['preferred']) ? $backend['preferred'] : array($backend['preferred']);
            if (in_array($_SERVER['SERVER_NAME'], $preferred) || in_array($_SERVER['HTTP_HOST'], $preferred)) {
                $backend_key = $key;
            }
        }
        return $backend_key;
    }

 /**
  * Add additional items to the sidebar.
  *
  * @param Horde_View_Sidebar $sidebar  The sidebar object.
  */
 public function sidebar($sidebar)
 {
     $backend = Gollem_Auth::getPreferredBackend();
     $url = $GLOBALS['registry']->getServiceLink('login', 'horde')->add(array('url' => (string) Horde::url('manager.php', true), 'app' => 'gollem'));
     if ($GLOBALS['conf']['backend']['backend_list'] == 'shown') {
         foreach (Gollem_Auth::getBackend() as $key => $val) {
             $row = array('selected' => $backend == $key, 'url' => $url->add('backend_key', $key), 'label' => $val['name'], 'type' => 'radiobox');
             $sidebar->addRow($row, 'backends');
         }
     }
 }