Problema con validación de formulario y Zend_Auth

[irilien]

Uhmm este es el controlador...

Código PHP:

  <?php
class Users_LoginController extends Zend_Controller_Action
{
    public function preDispatch()
    {
        if (Zend_Auth::getInstance()->hasIdentity()) {
            $this->_helper->redirector('index', 'index', 'default');
            // o bién $this->redirect('/');
        }
    }
    
    public function indexAction()
    {
        if ($this->_request->isPost()) {
            
            $authAdapter = new Zend_Auth_Adapter_DbTable(
                Zend_Registry::get('Zend_Db'),
                'users',
                'username',
                'password',
                'md5(?)'
            );
            
            $values = $this->_request->getPost();
            
            try {
                if(empty($values['username'])) {
                    throw new Exception("nombre de usuario vacío");
                } else {
                    $authAdapter->setIdentity($values['username'])
                                ->setCredential($values['password']);
                        
                    $result = Zend_Auth::getInstance()->authenticate($authAdapter);
                    
                    switch ($result->getCode()) {                    
                        case Zend_Auth_Result::SUCCESS:
                            if ($result->isValid()) {
                                $data = $authAdapter->getResultRowObject(null, 'password');
                                Zend_Auth::getInstance()->getStorage()->write($data);
                                $this->_helper->redirector('index', 'index', 'default');
                                // o bién $this->redirect('/');
                            }
                            break;
                        case Zend_Auth_Result::FAILURE:
                            throw new Exception("Failure");
                            break;
                        case Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND:
                            throw new Exception("Failure: Identity not foud");
                            break;
                        case Zend_Auth_Result::FAILURE_IDENTITY_AMBIGUOUS:
                            throw new Exception("Failure: Identity abiguous");
                            break;
                        case Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID:
                            throw new Exception("Failure: Credential invalid");
                            break;
                        case Zend_Auth_Result::FAILURE_UNCATEGORIZED:
                            throw new Exception("Failure: Uncategorized");
                            break;
                    }
                }
            } catch (Exception $e) {
                $this->view->message = $e->getMessage();
            }

        }
    }
    
    public function logoutAction()
    {
        Zend_Auth::getInstance()->clearIdentity();
        $this->_helper->redirector('index', 'login');
        // o bién $this->redirect('/users/login');
    }
}
?>