root/trunk/apps/main/lib/myGuardUserValidator.class.php

<?php
class myGuardUserValidator extends sfValidator
{

  public function initialize($context, $parameters = null)
  {
    // initialize parent
    parent::initialize($context);

    // set defaults
    $this->getParameterHolder()->set('username_error', 'Username or password is not valid.');
    $this->getParameterHolder()->set('inactive_error', 'Account has not been activated yet.');
    $this->getParameterHolder()->set('password_field', 'password');
    $this->getParameterHolder()->set('remember_field', 'remember');

    $this->getParameterHolder()->add($parameters);

    return true;
  }

  public function execute(&$value, &$error)
  {
    $password_field = $this->getParameterHolder()->get('password_field');
    $password = $this->getContext()->getRequest()->getParameter($password_field);

    $remember = false;
    $remember_field = $this->getParameterHolder()->get('remember_field');
    $remember = $this->getContext()->getRequest()->getParameter($remember_field);

    $username = $value;
    
    $c = new Criteria();
    $c->add(sfGuardUserPeer::USERNAME, $username);
    $user = sfGuardUserPeer::doSelectOne($c); 

    // user exists?
    if ($user)
    {
      // password is ok?
      if (!$user->checkPassword($password))
      {
        $error = $this->getParameterHolder()->get('password_error');
        return false;
      }
      
      // user is active?
      if (!$user->getIsActive())
      {
        $error = $this->getParameterHolder()->get('inactive_error');
        return false;
      }
      
      $this->getContext()->getUser()->signIn($user, $remember);
      return true;
    }

    $error = $this->getParameterHolder()->get('username_error');
    return false;
  }
}