Zend Framework 1 Acl implementation #1

gistfile1.txt

<?php 
class My_Acl extends Zend_Acl 
{
	protected static $_instance = null;
	
	const ROLE_GUEST = 'guest';
	const ROLE_MEMBER_STANDARD = 'member-standard';
	const ROLE_MEMBER_PREMIUM = 'member-premium';
	const ROLE_ADMIN = 'admin';
	
	protected $_roles = array(
		self::ROLE_GUEST,
		self::ROLE_MEMBER_STANDARD,
		self::ROLE_MEMBER_STANDARD => self::ROLE_MEMBER_PREMIUM,
		self::ROLE_ADMIN
	);

    /**
     * Returns an instance of My_Acl
     *
     * Singleton pattern implementation
     *
     * @return Zend_Auth Provides a fluent interface
     */
    public static function getInstance()
    {
        if (null === self::$_instance) {
            self::$_instance = new self();
        }

        return self::$_instance;
    }

    /**
     * Singleton pattern implementation makes "clone" unavailable
     *
     * @return void
     */
    protected function __clone()
    {}

    /**
     * Singleton pattern implementation makes "new" unavailable
     *
     * @return void
     */
    protected function __construct()
    {
		$this->_addRole();
		$this->_addResources();
		$this->_allow();
   	}
	
	protected function _addRole() 
	{
	    /*$this->addRole(new Zend_Acl_Role('guest'));
	    $this->addRole(new Zend_Acl_Role('member-standard'));
	    $this->addRole(new Zend_Acl_Role('member-premium'),'member-standard');
	    $this->addRole(new Zend_Acl_Role('admin'));*/
	    
	    foreach($this->_roles as $parent => $role) {
	    	$parent = is_string($parent) ? $parent : null;
	    	$this->addRole(new Zend_Acl_Role($role),$parent);
	    }
	}
	
	protected function _addResources() 
	{
    	$this->add(new Zend_Acl_Resource('error'));
    	$this->add(new Zend_Acl_Resource('index'));
    	$this->add(new Zend_Acl_Resource('user'));
    	$this->add(new Zend_Acl_Resource('auth'));
	}
	
	protected function _allow() 
	{    
		$this->allow('admin','error');
		$this->allow('member-standard','error');
		$this->allow('guest','error');
		
		$this->allow('admin','auth');
		$this->allow('member-standard','auth');
		$this->allow('guest','auth');
		
		
		$this->allow('member-standard','index');
		$this->allow('guest','index');
		$this->allow('admin','index');
		
    	$this->allow('admin','user');
    	$this->allow('member-standard','user','list',new My_Acl_Assert_CleanIPAssertion());
    	$this->allow('member-premium','user','edit');
    	//$this->allow('member-premium','user','add');
    	$this->allow('member-premium','index','about');
	}
}