<?php
/**
 * Virtual File System: Access Control Rule: File4Session
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @package WB
 * @subpackage vfs
 */

WBClass::load('WBVFS_AccessControlRule');

/**
 * Virtual File System: Access Control Rule: File4Session
 *
 * @version 0.1.0
 * @package WB
 * @subpackage vfs
 */
class WBVFS_AccessControlRule_File4Session extends WBVFS_AccessControlRule
{
    /**
     * Session
     * @var patSession_Storage
     */
    protected $sess;

    const SESS_KEY_NAME =   'wbvfs.acl.file4sess.list';

    /**
     * Constructor
     * @param array $parameter
     */
    public function __construct($parameter = array())
    {
        parent::__construct($parameter);

        $this->sess =   WBClass::create('patSession');
        if (!$this->sess->has(self::SESS_KEY_NAME)) {
            $this->sess->set(self::SESS_KEY_NAME, array());
        }
    }

    /**
     * 2nc Constructor
     *
     * Called after configuration was set
     */
    protected function init()
    {
    }

    /**
     * Check Permissions 4 Request
     *
     * @param WBRequest
     * @return bool
     */
    public function isRequestGranted($req)
    {
        $id     =   $this->file->getId();
        $list   =   $this->sess->get(self::SESS_KEY_NAME);
        if (in_array($id, $list)) {
            $this->log->debug($this->getLogMsg($this::GRANT_ALLOW, 'File found in session'));
            return true;
        }

        $this->log->debug($this->getLogMsg($this::GRANT_DENY, 'File not in session'));
        return false;
    }

    /**
     * Add File Id
     *
     * @param string
     */
    public function addFileId($id)
    {
        $list   =   $this->sess->get(self::SESS_KEY_NAME);
        $list[] =   $id;
        $list   =   array_unique($list);
        $this->sess->set(self::SESS_KEY_NAME, $list);
    }

    /**
     * Remove File Id
     *
     * @param string
     */
    public function removeFileId($id)
    {
        $list   =   $this->sess->get(self::SESS_KEY_NAME);
        if (!in_array($id, $list)) {
            return;
        }

        for ($i = 0; $i < count($list); ++$i) {
            if ($list[$i] == $id) {
                unset($list[$i]);
                break;
            }
        }

        $list   =   array_values($list);
        $this->sess->set(self::SESS_KEY_NAME, $list);
    }
}