public function authenticate()
{
$login = $_REQUEST['login'];
$password = md5($_REQUEST['password']);
if ($login == '' || $password == '') {
$user = new PEAR_Error('authentication_error_blank');
} else {
$user = new Administrator();
$user->whereAdd("login = '******'");
$user->whereAdd("password = '******'");
$user->find();
if ($user->N != 1) {
$user = new PEAR_Error('authentication_error_invalid');
} else {
$user->fetch();
}
}
return $user;
}