<?php

/**
 * session for memcached
 */

if (!defined('IN_ECS'))
{
    die('Hacking attempt');
}

class cls_session_memcached
{
    var $db             = NULL;
    var $session_table  = '';

    var $max_life_time  = 1800; // SESSION 杩囨湡鏃堕棿

    var $session_name   = '';
    var $session_id     = '';

    var $session_expiry = '';
    var $session_md5    = '';

    var $session_cookie_path   = '/';
    var $session_cookie_domain = '';
    var $session_cookie_secure = false;

    var $_ip   = '';
    var $_time = 0;

    function __construct(&$db, $session_table, $session_data_table, $session_name = 'ECS_ID', $session_id = '')
    {
        $GLOBALS['_SESSION'] = array();

        if (!empty($GLOBALS['cookie_path']))
        {
            $this->session_cookie_path = $GLOBALS['cookie_path'];
        }
        else
        {
            $this->session_cookie_path = '/';
        }

        if (!empty($GLOBALS['cookie_domain']))
        {
            $this->session_cookie_domain = $GLOBALS['cookie_domain'];
        }
        else
        {
            $this->session_cookie_domain = '';
        }

        if (!empty($GLOBALS['cookie_secure']))
        {
            $this->session_cookie_secure = $GLOBALS['cookie_secure'];
        }
        else
        {
            $this->session_cookie_secure = false;
        }

        $this->session_name       = $session_name;
        $this->session_table      = $session_table;
        $this->session_data_table = $session_data_table;

        $this->db  = &$db;
        $this->cache = $GLOBALS['cache'];
        $this->_ip = real_ip();

        if ($session_id == '' && !empty($_COOKIE[$this->session_name]))
        {
            $this->session_id = $_COOKIE[$this->session_name];
        }
        else
        {
            $this->session_id = $session_id;
        }

        if ($this->session_id)
        {
            $tmp_session_id = substr($this->session_id, 0, 32);
            if ($this->gen_session_key($tmp_session_id) == substr($this->session_id, 32))
            {
                $this->session_id = $tmp_session_id;
            }
            else
            {
                $this->session_id = '';
            }
        }

        $this->_time = time();

        if ($this->session_id)
        {
            $this->load_session();
        }
        else
        {
            $this->gen_session_id();

            setcookie($this->session_name, $this->session_id . $this->gen_session_key($this->session_id), 0, $this->session_cookie_path, $this->session_cookie_domain, $this->session_cookie_secure);
        }

        register_shutdown_function(array(&$this, 'close_session'));
    }

    function gen_session_id()
    {
        $this->session_id = md5(uniqid(mt_rand(), true));

        return $this->insert_session();
    }

    function gen_session_key($session_id)
    {
        static $ip = '';

        if ($ip == '')
        {
            $ip = substr($this->_ip, 0, strrpos($this->_ip, '.'));
        }

        return sprintf('%08x', crc32(ROOT_PATH . $ip . $session_id));
    }

    function insert_session()
    {
        return $this->cache->set($this->session_id, array('expiry'=>$this->_time, 'ip'=>$this->_ip, 'data'=>'a:0:{}'), $this->max_life_time);
    }

    function load_session()
    {
        $session = $this->cache->get($this->session_id);
        if (empty($session))
        {
            $this->insert_session();

            $this->session_expiry = 0;
            $this->session_md5    = '40cd750bba9870f18aada2478b24840a';
            $GLOBALS['_SESSION']  = array();
        }
        else
        {
            if (!empty($session['data']) && $this->_time - $session['expiry'] <= $this->max_life_time)
            {
                $this->session_expiry = $session['expiry'];
                $this->session_md5    = md5($session['data']);
                $GLOBALS['_SESSION']  = unserialize(stripslashes($session['data']));
            }
            else
            {
                $this->session_expiry = 0;
                $this->session_md5    = '40cd750bba9870f18aada2478b24840a';
                $GLOBALS['_SESSION']  = array();
            }
        }
    }

    function update_session()
    {
        $adminid = !empty($GLOBALS['_SESSION']['admin_id']) ? intval($GLOBALS['_SESSION']['admin_id']) : 0;
        $userid  = !empty($GLOBALS['_SESSION']['user_id'])  ? intval($GLOBALS['_SESSION']['user_id'])  : 0;

        $data        = serialize($GLOBALS['_SESSION']);
        $this->_time = time();

        if ($this->session_md5 == md5($data) && $this->_time < $this->session_expiry + 10)
        {
            return true;
        }

        $data = addslashes($data);

        return $this->cache->replace($this->session_id, array('expiry'=>$this->_time, 'ip'=>$this->_ip, 'userid'=>$userid, 'adminid'=>$adminid, 'data'=>$data), $this->max_life_time);
    }

    function close_session()
    {
        $this->update_session();
        return true;
    }

    function delete_spec_admin_session($adminid)
    {
        if (!empty($GLOBALS['_SESSION']['admin_id']) && $adminid)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    function destroy_session()
    {
        $GLOBALS['_SESSION'] = array();

        setcookie($this->session_name, $this->session_id, 1, $this->session_cookie_path, $this->session_cookie_domain, $this->session_cookie_secure);

        /* ECSHOP 鑷?畾涔夋墽琛岄儴鍒 */
        if (!empty($GLOBALS['ecs']))
        {
            $this->db->query('DELETE FROM ' . $GLOBALS['ecs']->table('cart') . " WHERE session_id = '$this->session_id'");
        }
        /* ECSHOP 鑷?畾涔夋墽琛岄儴鍒 */

        return $this->cache->rm($this->session_id);;
    }

    function get_session_id()
    {
        return $this->session_id;
    }

    function get_users_count()
    {
        return 0; // $this->db->getOne('SELECT count(*) FROM ' . $this->session_table);
    }
}