Zend ACL - convert permission to public - php

Question

I need an ACL for my project, I've watched Alexander Romanenko'video I've been looking into Zend ACL which seems to cover my needs. It's so amazing and I've implemented this :
models/LibraryAcl.php :
<?php
class Model_LibraryAcl extends Zend_Acl
{
public function __construct()
{
$this ->add (new Zend_Acl_Resource('index'));
$this ->add (new Zend_Acl_Resource('authentication','login'));
$this-> add (new Zend_Acl_Resource('list'),'books');
$this->addRole(new Zend_Acl_Role('user'));
$this->addRole(new Zend_Acl_Role('admin'),'user');
$this->allow ('user','user');
$this->allow ('user','index');
$this ->allow('admin','books', 'list' ));
}
}
plugins/AccessCheck.php:
<?php
class Plugin_AccessCheck extends Zend_Controller_Plugin_Abstract{
private $_acl = null;
private $_auth = null;
public function __construct(Zend_Acl $acl , Zend_Auth $auth){
$this->_acl = $acl;
$this->_auth = $auth;
}
public function preDispatch(Zend_Controller_Request_Abstract $request){
$resource = $request->getControllerName();
$action = $request->getActionName();
$identity = $this->_auth->getStorage()->read();
$role = $identity->role;
if (!$this->_acl ->isAllowed($role,$resource,$action) ){
$request->setControllerName('authentication')
->setActionName('login');
}
}
}
All I want is allowing all people (admin, user and people who doesn't log in yet) to access to log in page (authentication/login -> controller name: authentication , action name : login)
UPDATE:
I find out I have to use guest as role and set permission for this role.

Answer 1

$this->addRole(new Zend_Acl_Role('guest'));
$this->addRole(new Zend_Acl_Role('user'), 'guest');
$this->addRole(new Zend_Acl_Role('admin'), 'user');
$this->allow('guest', 'authentication', 'login');

Answer 2

change AccessCheck.php:
<?php
class Plugin_AccessCheck extends Zend_Controller_Plugin_Abstract{
const UNAUTHORIZED_ACCESS = 'UNAUTHORIZED_ACCESS';
public function preDispatch(Zend_Controller_Request_Abstract $request){
$auth = Zend_Auth::getInstance();
if ($auth->hasIdentity()){
$role = $auth->getIdentity();
}else{
$role = 'guest';
}
$acl = new Model_LibraryAcl();
$resource = $request->getControllerName();
$action = $request->getActionName();
if ($acl->isAllowed($role,$resource,$action) ){
$request->setControllerName('authentication')
->setActionName('login');
}
}
}
And add it to LibraryAcl.php
$this->addRole(new Zend_Acl_Role('guest'));
$this->addRole(new Zend_Acl_Role('user'), 'guest');
$this->addRole(new Zend_Acl_Role('admin'), 'user');
$this->allow('guest', 'authentication', 'login');