1: <?php
  2: /**
  3:  * HtmLawed is used here to provide protection against XSS attacks with Editor
  4:  * input - see the `Field->xss()` method. The Vanilla forums wrapper is used
  5:  * to provide sensible defaults and a clean interface for HtmLawed.
  6:  * 
  7:  * Changes:
  8:  * 
  9:  *  * Add `DataTables/Vendor` namespace to this and htmLawed - this is to ensure
 10:  *    that if htmLawed is included by any other aspect of the site it will not
 11:  *    result in a conflict.
 12:  *  * Use the OOP version of htmLawed (required a single updated to call it) to
 13:  *    make the namespacing relatively easy.
 14:  *  * Change the name of the Vanilla class so it don't conflict with the
 15:  *    htmLawed OOP class
 16:  *  * Update all `htmLawed::` references to `\DataTables\Vendor\htmLawed::` in
 17:  *    the htmLawed file (to allow callbacks to operate correctly)
 18:  *  * Updated Vanilla wrapper to operate on PHP 5.3
 19:  * 
 20:  * HtmLawed:
 21:  *   http://www.bioinformatics.org/phplabware/internal_utilities/htmLawed/
 22:  *   Copyright: Santosh Patnaik
 23:  *   License: Dual licensed with LGPL 3 and GPL 2+
 24:  *
 25:  * Vanilla wrapper for HtmLawed:
 26:  *   https://github.com/vanilla/htmlawed/
 27:  *   Author: Todd Burry <todd@vanillaforums.com>
 28:  *   Copyright: 2009-2014 Vanilla Forums Inc.
 29:  *   License: LGPL-3.0
 30:  */
 31: 
 32: namespace DataTables\Vendor;
 33: 
 34: /**
 35:  * A class wrapper for the htmLawed library.
 36:  */
 37: class Htmlaw {
 38:     /// Methods ///
 39: 
 40:     public static $defaultConfig = array(
 41:         'anti_link_spam' => array('`.`', ''),
 42:         'comment' => 1,
 43:         'cdata' => 3,
 44:         'css_expression' => 1,
 45:         'deny_attribute' => 'on*',
 46:         'unique_ids' => 0,
 47:         'elements' => '*-applet-form-input-textarea-iframe-script-style-embed-object',
 48:         'keep_bad' => 1,
 49:         'schemes' => 'classid:clsid; href: aim, feed, file, ftp, gopher, http, https, irc, mailto, news, nntp, sftp, ssh, telnet; style: nil; *:file, http, https', // clsid allowed in class
 50:         'valid_xhtml' => 0,
 51:         'direct_list_nest' => 1,
 52:         'balance' => 1
 53:     );
 54: 
 55:     public static $defaultSpec = array(
 56:         'object=-classid-type, -codebase',
 57:         'embed=type(oneof=application/x-shockwave-flash)'
 58:     );
 59: 
 60:     /**
 61:      * Filters a string of html with the htmLawed library.
 62:      *
 63:      * @param string $html The text to filter.
 64:      * @param array|null $config Config settings for the array.
 65:      * @param string|array|null $spec A specification to further limit the allowed attribute values in the html.
 66:      * @return string Returns the filtered html.
 67:      * @see http://www.bioinformatics.org/phplabware/internal_utilities/htmLawed/htmLawed_README.htm
 68:      */
 69:     public static function filter($html, array $config = null, $spec = null) {
 70:         require_once __DIR__.'/htmLawed/htmLawed.php';
 71: 
 72:         if ($config === null) {
 73:             $config = self::$defaultConfig;
 74:         }
 75: 
 76:         if (isset($config['spec']) && !$spec) {
 77:             $spec = $config['spec'];
 78:         }
 79: 
 80:         if ($spec === null) {
 81:             $spec = static::$defaultSpec;
 82:         }
 83: 
 84:         return htmLawed::hl($html, $config, $spec);
 85:     }
 86: 
 87: 
 88:     /**
 89:      * Filter a string of html so that it can be put into an rss feed.
 90:      *
 91:      * @param $html The html text to fitlter.
 92:      * @return string Returns the filtered html.
 93:      * @see Htmlawed::filter().
 94:      */
 95:     public static function filterRSS($html) {
 96:         $config = array(
 97:             'anti_link_spam' => array('`.`', ''),
 98:             'comment' => 1,
 99:             'cdata' => 3,
100:             'css_expression' => 1,
101:             'deny_attribute' => 'on*,style,class',
102:             'elements' => '*-applet-form-input-textarea-iframe-script-style-object-embed-comment-link-listing-meta-noscript-plaintext-xmp',
103:             'keep_bad' => 0,
104:             'schemes' => 'classid:clsid; href: aim, feed, file, ftp, gopher, http, https, irc, mailto, news, nntp, sftp, ssh, telnet; style: nil; *:file, http, https', // clsid allowed in class
105:             'valid_xml' => 2,
106:             'balance' => 1
107:         );
108:         $spec = static::$defaultSpec;
109: 
110:         $result = static::filter($html, $config, $spec);
111: 
112:         return $result;
113:     }
114: }
115: