Here is a very basic script which should come in handy to anyone trying to set up a login redirection (to the referer) whilst maintaining parameters being passed through the url.

Using $this->getRequest()->getReferer(); will only pass through the module and action.

  public function executeLogin()
  {
    //This captures the referer's uri
    $referer = sfRouting::getInstance()->getCurrentInternalUri(true);
 
    if ($this->getRequest()->getMethod() != sfRequest::POST)
    {
      $this->getRequest()->getParameterHolder()->set('referer', $referer);
    } 
  }
 
  public function executeChecklogin()
  {
    //if the referer isn't set, set it to the home page
    $referer = $this->getRequestParameter('referer', '@homepage');
 
    //if the referer is the login page itself, refer to the home page
    if($referer == 'user/login') $referer = '@homepage';
    return $this->redirect($referer);
  }