Zend Auth Storage

<?php
/**
 * Slaat de data(1) encrypted op in een cookie en een sessie.
 *
 *      (1) customer_username_password
 *
 * Bij het ophalen van de data wordt alles decrypted terug gegeven.
 *
 * @category    AC
 * @package     AC_Auth
 * @author      Stijn Leenknegt
 */
class AC_Auth_Storage implements Zend_Auth_Storage_Interface
{


    /**
     * Standaard session namespace.
     */
    const SESSION_NACESPACE = 'AC_Auth';

    /**
     * Standaard session naam.
     */
    const SESSION_MEMBER    = 'storage';

    /**
     * Standaard cookie naam.
     */
    const COOKIE_NACE       = 'AC_Auth';

    /**
     * Standaard duurtijd van de cookie van 1 jaar.
     */
    const COOKIE_LIFETIME   = 31536000;


    /**
     * Session namespace.
     *
     * @var string
     */
    private $_sessionNamespace;

    /**
     * Session member naam.
     *
     * @var string
     */
    private $_sessionMember;

    /**
     * Cookie naam.
     *
     * @var string
     */
    private $_cookieName;

    /**
     * Cookie duurtijd.
     *
     * @var integer
     */
    private $_cookieLifetime;

    /**
     * Session object.
     *
     * @var Zend_Session_Namespace
     */
    private $_session;


    /**
     * Initialiseert het standaard Agro Manager storage object.
     *
     * @param string $sessionNamespace
     * @param string $sessionMember
     * @param string $cookieName
     * @param integer $cookieLifetime
     */
    public function __construct($sessionNamespace = self::SESSION_NACESPACE, $sessionMember = self::SESSION_MEMBER, $cookieName = self::COOKIE_NACE, $cookieLifetime = self::COOKIE_LIFETIME)
    {
        $this->_sessionNamespace = $sessionNamespace;
        $this->_sessionMember = $sessionMember;
        $this->_cookieName = $cookieName;
        $this->_cookieLifetime = $cookieLifetime;
        $this->_session = new Zend_Session_Namespace($this->_sessionNamespace);
    }


    /**
     * Geeft de waarde van de cookie terug.
     * Deze waarde is niet decrypted.
     *
     * @return string
     */
    private function getCookie()
    {
        if (isset($_COOKIE[$this->_cookieName])) {
            return $_COOKIE[$this->_cookieName];
        }

        return "";
    }


    /**
     * Stelt de cookie in. De data parameter moet encrypted zijn.
     *
     * @param string $data
     */
    private function setCookie($data)
    {
        setcookie($this->_cookieName, $data, time() + $this->_cookieLifetime);
    }


    /**
     * Deletes the authentication cookie.
     */
    private function deleteCookie()
    {
        setcookie($this->_cookieName, '', time() - $this->_cookieLifetime);
    }


    /**
     * Defined by Zend_Auth_Storage_Interface
     *
     * @return boolean
     */
    public function isEmpty()
    {
        if(isset($this->_session->{$this->_sessionMember})) {
            return false;
        } else {
            $cookie = $this->getCookie();
            if (!empty($cookie)) {
                return false;
            }
        }

        return true;
    }


    /**
     * Defined by Zend_Auth_Storage_Interface
     *
     * @return mixed
     */
    public function read()
    {
        $contents = $this->_session->{$this->_sessionMember};

        if(empty($contents)) {
            $contents = $this->getCookie();
        }

        if(!empty($contents)) {
            $contents = AC_Encrypt::decrypt($contents);
        }

        return $contents;
    }


    /**
     * Defined by Zend_Auth_Storage_Interface
     *
     * @param  mixed $contents
     * @return void
     */
    public function write($contents)
    {
        $contents = AC_Encrypt::encrypt($contents);
        $this->_session->{$this->_sessionMember} = $contents;
        $this->setCookie($contents);
    }


    /**
     * Defined by Zend_Auth_Storage_Interface
     *
     * @return void
     */
    public function clear()
    {
        unset($this->_session->{$this->_sessionMember});
        $this->deleteCookie();
    }


}