<?php
/* Copyright (C) NAVER <http://www.navercorp.com> */

class UploadFileFilter
{
        private static $_block_list = array('exec', 'system', 'passthru', 'show_source', 'phpinfo', 'fopen', 'file_get_contents', 'file_put_contents', 'fwrite', 'proc_open', 'popen');

        public function check($file)
        {
                if (!$file || !file_exists($file)) return TRUE;
                return self::_check($file);
        }

        private function _check($file)
        {
                if (!($fp = fopen($file, 'r'))) return FALSE;
                $has_php_tag = FALSE;
                while (!feof($fp))
                {
                        $content = fread($fp, 8192);
                        if (FALSE === $has_php_tag) $has_php_tag = strpos($content, '<?');
                        foreach (self::$_block_list as $v)
                        {
                                if (FALSE !== $has_php_tag && FALSE !== strpos($content, $v))
                                {
                                        fclose($fp);
                                        return FALSE;
                                }
                        }
                }

                fclose($fp);
                
                return TRUE;
        }
}

/* End of file : UploadFileFilter.class.php */
/* Location: ./classes/security/UploadFileFilter.class.php */