File oops_lib/Xoops/Core/Text/Sanitizer/Extensions/Censor.php

 1: <?php
 2: /*
 3:  You may not change or alter any portion of this comment or credits
 4:  of supporting developers from this source code or any supporting source code
 5:  which is considered copyrighted (c) material of the original comment or credit authors.
 6: 
 7:  This program is distributed in the hope that it will be useful,
 8:  but WITHOUT ANY WARRANTY; without even the implied warranty of
 9:  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10: */
11: 
12: namespace Xoops\Core\Text\Sanitizer\Extensions;
13: 
14: use Xoops\Core\Text\Sanitizer;
15: use Xoops\Core\Text\Sanitizer\FilterAbstract;
16: 
17: /**
18:  * TextSanitizer filter to Replace banned words in a string with their replacements
19:  * or terminate current request
20:  *
21:  * @category  Sanitizer
22:  * @package   Xoops\Core\Text
23:  * @author    Taiwen Jiang <phppp@users.sourceforge.net>
24:  * @copyright 2000-2015 XOOPS Project (http://xoops.org)
25:  * @license   GNU GPL 2 (http://www.gnu.org/licenses/gpl-2.0.html)
26:  * @link      http://xoops.org
27:  */
28: class Censor extends FilterAbstract
29: {
30:     /**
31:      * @var array default configuration values
32:      */
33:     protected static $defaultConfiguration = [
34:         'enabled' => true,
35:         'censor_terminate' => false, //set to true if you want to trigger an error page
36:         'censor_admin' => true,      //set to false if you don't want to censor admin entries
37:         'censor_words' => ['shit', 'piss', 'fuck', 'cunt', 'cocksucker', 'motherfucker', 'tits'],
38:         'censor_replace' => '%#$@!',
39:     ];
40: 
41:     /**
42:      * Censor text string according to
43:      *
44:      * @param string $text text to censor
45:      *
46:      * @return string
47:      */
48:     public function applyFilter($text)
49:     {
50:         $xoops = \Xoops::getInstance();
51: 
52:         $enabled = (bool) $xoops->getConfig('censor_enable');
53: 
54:         $censorWords = (array) $xoops->getConfig('censor_words');
55:         $censorWords = empty($censorWords) ? $this->config['censor_words'] : $censorWords;
56: 
57:         $censorReplace = $xoops->getConfig('censor_replace');
58:         $censorReplace = empty($censorReplace) ? $this->config['censor_replace'] : $censorReplace;
59: 
60:         if ($enabled === false
61:             || empty($censorWords)
62:             || ((false === $this->config['censor_admin']) && $xoops->userIsAdmin)
63:         ) {
64:             return $text;
65:         }
66: 
67:         $patterns = [];
68:         $replacements = [];
69: 
70:         foreach ($censorWords as $bad) {
71:             $bad = trim($bad);
72:             if (!empty($bad)) {
73:                 if (false === stripos($text, $bad)) {
74:                     continue;
75:                 }
76:                 if ((bool) $this->config['censor_terminate']) {
77:                     trigger_error("Censor words found", E_USER_ERROR);
78:                     return '';
79:                 }
80:                 $patterns[] = "/(^|[^0-9a-z_]){$bad}([^0-9a-z_]|$)/siU";
81:                 $replacements[] = "\\1{$censorReplace}\\2";
82:             }
83:         }
84: 
85:         $text = preg_replace($patterns, $replacements, $text);
86: 
87:         return $text;
88:     }
89: }
90:
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