<?php
/**
 * 防采集混淆字符串
 *
 * @version        $Id: downmix.inc.php 1 9:14 2010年7月6日Z tianya $
 * @package        DedeBIZ.Libraries
 * @copyright      Copyright (c) 2022, DedeBIZ.COM
 * @license        https://www.dedebiz.com/license
 * @link           https://www.dedebiz.com
 */
/**
 *  混淆字符串内容
 *
 * @access    public
 * @param     string  $body  内容
 * @return    string
 */
if (!function_exists('RndString')) {
    function RndString(&$body)
    {
        //最大间隔距离(如果在检测不到p标记的情况下，加入混淆字串的最大间隔距离)
        $maxpos = 1024;

        //font 的字体颜色
        $fontColor = "#FFFFFF";

        //div span p 标记的随机样式
        $st1 = chr(mt_rand(ord('A'), ord('Z'))).chr(mt_rand(ord('a'), ord('z'))).chr(mt_rand(ord('a'), ord('z'))).mt_rand(100, 999);
        $st2 = chr(mt_rand(ord('A'), ord('Z'))).chr(mt_rand(ord('a'), ord('z'))).chr(mt_rand(ord('a'), ord('z'))).mt_rand(100, 999);
        $st3 = chr(mt_rand(ord('A'), ord('Z'))).chr(mt_rand(ord('a'), ord('z'))).chr(mt_rand(ord('a'), ord('z'))).mt_rand(100, 999);
        $st4 = chr(mt_rand(ord('A'), ord('Z'))).chr(mt_rand(ord('a'), ord('z'))).chr(mt_rand(ord('a'), ord('z'))).mt_rand(100, 999);
        $rndstyle[1]['value'] = ".{$st1} { display:none; }";
        $rndstyle[1]['name'] = $st1;
        $rndstyle[2]['value'] = ".{$st2} { display:none; }";
        $rndstyle[2]['name'] = $st2;
        $rndstyle[3]['value'] = ".{$st3} { display:none; }";
        $rndstyle[3]['name'] = $st3;
        $rndstyle[4]['value'] = ".{$st4} { display:none; }";
        $rndstyle[4]['name'] = $st4;
        $mdd = mt_rand(1, 4);
        $rndstyleValue = $rndstyle[$mdd]['value'];
        $rndstyleName = $rndstyle[$mdd]['name'];
        $reString = "<style> $rndstyleValue </style>\r\n";

        //附机标记
        $rndem[1] = 'font';
        $rndem[2] = 'div';
        $rndem[3] = 'span';
        $rndem[4] = 'p';

        //读取字符串数据
        $fp = fopen(DEDEDATA.'/downmix.data.php', 'r');
        $start = 0;
        $totalitem = 0;

        while (!feof($fp)) {
            $v = trim(fgets($fp, 128));
            if ($start == 1) {
                if (preg_match("/#end#/i", $v)) {
                    break;
                }
                if ($v != '') {
                    $totalitem++;
                    $rndstring[$totalitem] = preg_replace("/#,/", "", $v);
                }
            }
            if (preg_match("/#start#/i", $v)) {
                $start = 1;
            }
        }
        fclose($fp);

        //处理要防采集的字段
        $bodylen = strlen($body) - 1;
        $prepos = 0;
        for ($i = 0; $i <= $bodylen; $i++) {
            if ($i + 2 >= $bodylen || $i < 50) {
                $reString .= $body[$i];
            } else {
                $ntag = @strtolower($body[$i].$body[$i + 1].$body[$i + 2]);
                if ($ntag == '</p' || ($ntag == '<br' && $i - $prepos > $maxpos)) {
                    $dd = mt_rand(1, 4);
                    $emname = $rndem[$dd];
                    $dd = mt_rand(1, $totalitem);
                    $rnstr = $rndstring[$dd];
                    if ($emname != 'font') {
                        $rnstr = " <$emname class='$rndstyleName'>$rnstr</$emname> ";
                    } else {
                        $rnstr = " <span style='$fontColor'>$rnstr</span> ";
                    }
                    $reString .= $rnstr.$body[$i];
                    $prepos = $i;
                } else {
                    $reString .= $body[$i];
                }
            }
        }
        return $reString;
    } //函数结束
}