DedeV6/system/helpers/filter.helper.php

<?php
if (!defined('DEDEINC')) exit('dedebiz');
/**
 * 过滤小助手
 *
 * @version        $Id: time.filter.php 1 2010-07-05 11:43:09Z tianya $
 * @package        DedeBIZ.Helpers
 * @copyright      Copyright (c) 2022, DedeBIZ.COM
 * @license        https://www.dedebiz.com/license
 * @link           https://www.dedebiz.com
 */
/**
 *  去除html中不规则内容字符

 *
 * @access    public
 * @param     string  $str  需要处理的字符串
 * @param     string  $rptype  返回类型
 *            $rptype = 0 表示仅替换 html标记
 *            $rptype = 1 表示替换 html标记同时去除连续空白字符
 *            $rptype = 2 表示替换 html标记同时去除所有空白字符
 *            $rptype = -1 表示仅替换 html危险的标记 
 * @return    string
 */
if (!function_exists('HtmlReplace')) {
    function HtmlReplace($str, $rptype = 0)
    {
        $str = stripslashes($str);
        $str = preg_replace("/<[\/]{0,1}style([^>]*)>(.*)<\/style>/i", '', $str);
        if ($rptype == 0) {
            $str = dede_htmlspecialchars($str);
        } else if ($rptype == 1) {
            $str = dede_htmlspecialchars($str);
            $str = str_replace("　", ' ', $str);
            $str = preg_replace("/[\r\n\t ]{1,}/", ' ', $str);
        } else if ($rptype == 2) {
            $str = dede_htmlspecialchars($str);
            $str = str_replace("　", '', $str);
            $str = preg_replace("/[\r\n\t ]/", '', $str);
        } else {
            $str = preg_replace("/[\r\n\t ]{1,}/", ' ', $str);
            $str = preg_replace('/script/i', 'ｓｃｒｉｐｔ', $str);
            $str = preg_replace("/<[\/]{0,1}(link|meta|ifr|fra)[^>]*>/i", '', $str);
        }
        return addslashes($str);
    }
}



/**
 *  修复浏览器XSS hack的函数
 *
 * @param     string   $val  需要处理的内容
 * @return    string
 */
if (!function_exists('RemoveXSS')) {
    function RemoveXSS($val)
    {
        $val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val);
        $search = 'abcdefghijklmnopqrstuvwxyz';
        $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $search .= '1234567890!@#$%^&*()';
        $search .= '~`";:?+/={}[]-_|\'\\';
        for ($i = 0; $i < strlen($search); $i++) {
            $val = preg_replace('/(&#[xX]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); //with a ;
            $val = preg_replace('/(&#0{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); //with a ;
        }

        $ra1 = array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
        $ra2 = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
        $ra = array_merge($ra1, $ra2);

        $found = true;
        while ($found == true) {
            $val_before = $val;
            for ($i = 0; $i < sizeof($ra); $i++) {
                $pattern = '/';
                for ($j = 0; $j < strlen($ra[$i]); $j++) {
                    if ($j > 0) {
                        $pattern .= '(';
                        $pattern .= '(&#[xX]0{0,8}([9ab]);)';
                        $pattern .= '|';
                        $pattern .= '|(&#0{0,8}([9|10|13]);)';
                        $pattern .= ')*';
                    }
                    $pattern .= $ra[$i][$j];
                }
                $pattern .= '/i';
                $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2);
                $val = preg_replace($pattern, $replacement, $val);
                if ($val_before == $val) {
                    $found = false;
                }
            }
        }
        return $val;
    }
}

/**
 *  处理禁用HTML但允许换行的内容
 *
 * @access    public
 * @param     string  $msg  需要过滤的内容
 * @return    string
 */
if (!function_exists('TrimMsg')) {
    function TrimMsg($msg)
    {
        $msg = trim(stripslashes($msg));
        $msg = nl2br(dede_htmlspecialchars($msg));
        $msg = str_replace("  ", "&nbsp;&nbsp;", $msg);
        return addslashes($msg);
    }
}

/**
 *  过滤用于搜索的字符串
 *
 * @param     string  $keyword  关键词
 * @return    string
 */
if (!function_exists('FilterSearch')) {
    function FilterSearch($keyword)
    {
        global $cfg_soft_lang;
        if ($cfg_soft_lang == 'utf-8') {
            $keyword = preg_replace("/[\"\r\n\t\$\\><']/", '', $keyword);
            if ($keyword != stripslashes($keyword)) {
                return '';
            } else {
                return $keyword;
            }
        } else {
            $restr = '';
            for ($i = 0; isset($keyword[$i]); $i++) {
                if (ord($keyword[$i]) > 0x80) {
                    if (isset($keyword[$i + 1]) && ord($keyword[$i + 1]) > 0x40) {
                        $restr .= $keyword[$i].$keyword[$i + 1];
                        $i++;
                    } else {
                        $restr .= ' ';
                    }
                } else {
                    if (preg_match("/[^0-9a-z@#\.]/", $keyword[$i])) {
                        $restr .= ' ';
                    } else {
                        $restr .= $keyword[$i];
                    }
                }
            }
        }
        return $restr;
    }
}