function authenticate()
 {
     $json = getJSONobj();
     $username = '';
     $password = '';
     $servername = '';
     $terms_checked = '';
     if (isset($_REQUEST['username'])) {
         $username = nl2br($_REQUEST['username']);
     }
     if (isset($_REQUEST['password'])) {
         $password = nl2br($_REQUEST['password']);
     }
     if (isset($_REQUEST['servername'])) {
         $servername = $_REQUEST['servername'];
     }
     if (isset($_REQUEST['terms_checked'])) {
         $terms_checked = $_REQUEST['terms_checked'];
         if ($terms_checked == 'on') {
             $terms_checked = true;
         }
     }
     if (!empty($username) && !empty($password)) {
         $password = md5($password);
         $result = PackageManager::authenticate($username, $password, $servername, $terms_checked);
         if (!is_array($result) && $result == true) {
             $status = 'success';
         } else {
             $status = $result['faultstring'];
         }
     } else {
         $status = 'failed';
     }
     echo 'result = ' . $json->encode(array('status' => $status));
 }