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2312 lines
57 KiB
2312 lines
57 KiB
<?php |
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/** |
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* kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes |
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* Copyright (C) 2002, 2003, 2005 Ulf Harnhammar |
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* |
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* This program is free software and open source software; you can redistribute |
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* it and/or modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of the License, |
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* or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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* more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
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* http://www.gnu.org/licenses/gpl.html |
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* |
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* [kses strips evil scripts!] |
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* |
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* Added wp_ prefix to avoid conflicts with existing kses users |
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* |
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* @version 0.2.2 |
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* @copyright (C) 2002, 2003, 2005 |
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* @author Ulf Harnhammar <http://advogato.org/person/metaur/> |
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* |
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* @package External |
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* @subpackage KSES |
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*/ |
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/** |
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* Specifies the default allowable HTML tags. |
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* |
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* Using `CUSTOM_TAGS` is not recommended and should be considered deprecated. The |
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* {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context. |
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* |
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* @see wp_kses_allowed_html() |
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* @since 1.2.0 |
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* |
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* @var array[]|bool Array of default allowable HTML tags, or false to use the defaults. |
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*/ |
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if ( ! defined( 'CUSTOM_TAGS' ) ) { |
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define( 'CUSTOM_TAGS', false ); |
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} |
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|
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// Ensure that these variables are added to the global namespace |
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// (e.g. if using namespaces / autoload in the current PHP environment). |
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global $allowedposttags, $allowedtags, $allowedentitynames; |
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|
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if ( ! CUSTOM_TAGS ) { |
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/** |
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* KSES global for default allowable HTML tags. |
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* |
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* Can be overridden with the `CUSTOM_TAGS` constant. |
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* |
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* @var array[] $allowedposttags Array of default allowable HTML tags. |
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* @since 2.0.0 |
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*/ |
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$allowedposttags = array( |
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'address' => array(), |
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'a' => array( |
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'href' => true, |
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'rel' => true, |
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'rev' => true, |
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'name' => true, |
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'target' => true, |
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'download' => array( |
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'valueless' => 'y', |
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), |
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), |
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'abbr' => array(), |
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'acronym' => array(), |
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'area' => array( |
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'alt' => true, |
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'coords' => true, |
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'href' => true, |
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'nohref' => true, |
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'shape' => true, |
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'target' => true, |
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), |
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'article' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'aside' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'audio' => array( |
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'autoplay' => true, |
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'controls' => true, |
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'loop' => true, |
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'muted' => true, |
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'preload' => true, |
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'src' => true, |
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), |
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'b' => array(), |
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'bdo' => array( |
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'dir' => true, |
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), |
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'big' => array(), |
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'blockquote' => array( |
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'cite' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'br' => array(), |
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'button' => array( |
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'disabled' => true, |
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'name' => true, |
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'type' => true, |
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'value' => true, |
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), |
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'caption' => array( |
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'align' => true, |
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), |
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'cite' => array( |
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'dir' => true, |
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'lang' => true, |
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), |
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'code' => array(), |
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'col' => array( |
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'align' => true, |
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'char' => true, |
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'charoff' => true, |
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'span' => true, |
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'dir' => true, |
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'valign' => true, |
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'width' => true, |
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), |
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'colgroup' => array( |
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'align' => true, |
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'char' => true, |
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'charoff' => true, |
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'span' => true, |
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'valign' => true, |
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'width' => true, |
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), |
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'del' => array( |
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'datetime' => true, |
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), |
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'dd' => array(), |
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'dfn' => array(), |
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'details' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'open' => true, |
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'xml:lang' => true, |
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), |
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'div' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'dl' => array(), |
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'dt' => array(), |
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'em' => array(), |
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'fieldset' => array(), |
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'figure' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'figcaption' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'font' => array( |
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'color' => true, |
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'face' => true, |
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'size' => true, |
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), |
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'footer' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'h1' => array( |
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'align' => true, |
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), |
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'h2' => array( |
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'align' => true, |
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), |
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'h3' => array( |
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'align' => true, |
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), |
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'h4' => array( |
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'align' => true, |
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), |
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'h5' => array( |
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'align' => true, |
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), |
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'h6' => array( |
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'align' => true, |
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), |
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'header' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'hgroup' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'hr' => array( |
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'align' => true, |
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'noshade' => true, |
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'size' => true, |
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'width' => true, |
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), |
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'i' => array(), |
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'img' => array( |
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'alt' => true, |
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'align' => true, |
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'border' => true, |
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'height' => true, |
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'hspace' => true, |
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'longdesc' => true, |
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'vspace' => true, |
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'src' => true, |
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'usemap' => true, |
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'width' => true, |
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), |
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'ins' => array( |
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'datetime' => true, |
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'cite' => true, |
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), |
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'kbd' => array(), |
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'label' => array( |
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'for' => true, |
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), |
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'legend' => array( |
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'align' => true, |
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), |
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'li' => array( |
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'align' => true, |
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'value' => true, |
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), |
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'map' => array( |
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'name' => true, |
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), |
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'mark' => array(), |
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'menu' => array( |
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'type' => true, |
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), |
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'nav' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'p' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'pre' => array( |
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'width' => true, |
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), |
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'q' => array( |
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'cite' => true, |
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), |
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's' => array(), |
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'samp' => array(), |
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'span' => array( |
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'dir' => true, |
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'align' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'section' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'small' => array(), |
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'strike' => array(), |
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'strong' => array(), |
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'sub' => array(), |
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'summary' => array( |
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'align' => true, |
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'dir' => true, |
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'lang' => true, |
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'xml:lang' => true, |
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), |
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'sup' => array(), |
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'table' => array( |
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'align' => true, |
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'bgcolor' => true, |
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'border' => true, |
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'cellpadding' => true, |
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'cellspacing' => true, |
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'dir' => true, |
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'rules' => true, |
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'summary' => true, |
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'width' => true, |
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), |
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'tbody' => array( |
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'align' => true, |
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'char' => true, |
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'charoff' => true, |
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'valign' => true, |
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), |
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'td' => array( |
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'abbr' => true, |
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'align' => true, |
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'axis' => true, |
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'bgcolor' => true, |
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'char' => true, |
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'charoff' => true, |
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'colspan' => true, |
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'dir' => true, |
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'headers' => true, |
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'height' => true, |
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'nowrap' => true, |
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'rowspan' => true, |
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'scope' => true, |
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'valign' => true, |
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'width' => true, |
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), |
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'textarea' => array( |
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'cols' => true, |
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'rows' => true, |
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'disabled' => true, |
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'name' => true, |
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'readonly' => true, |
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), |
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'tfoot' => array( |
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'align' => true, |
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'char' => true, |
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'charoff' => true, |
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'valign' => true, |
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), |
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'th' => array( |
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'abbr' => true, |
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'align' => true, |
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'axis' => true, |
|
'bgcolor' => true, |
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'char' => true, |
|
'charoff' => true, |
|
'colspan' => true, |
|
'headers' => true, |
|
'height' => true, |
|
'nowrap' => true, |
|
'rowspan' => true, |
|
'scope' => true, |
|
'valign' => true, |
|
'width' => true, |
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), |
|
'thead' => array( |
|
'align' => true, |
|
'char' => true, |
|
'charoff' => true, |
|
'valign' => true, |
|
), |
|
'title' => array(), |
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'tr' => array( |
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'align' => true, |
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'bgcolor' => true, |
|
'char' => true, |
|
'charoff' => true, |
|
'valign' => true, |
|
), |
|
'track' => array( |
|
'default' => true, |
|
'kind' => true, |
|
'label' => true, |
|
'src' => true, |
|
'srclang' => true, |
|
), |
|
'tt' => array(), |
|
'u' => array(), |
|
'ul' => array( |
|
'type' => true, |
|
), |
|
'ol' => array( |
|
'start' => true, |
|
'type' => true, |
|
'reversed' => true, |
|
), |
|
'var' => array(), |
|
'video' => array( |
|
'autoplay' => true, |
|
'controls' => true, |
|
'height' => true, |
|
'loop' => true, |
|
'muted' => true, |
|
'poster' => true, |
|
'preload' => true, |
|
'src' => true, |
|
'width' => true, |
|
), |
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); |
|
|
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/** |
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* @var array[] $allowedtags Array of KSES allowed HTML elements. |
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* @since 1.0.0 |
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*/ |
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$allowedtags = array( |
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'a' => array( |
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'href' => true, |
|
'title' => true, |
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), |
|
'abbr' => array( |
|
'title' => true, |
|
), |
|
'acronym' => array( |
|
'title' => true, |
|
), |
|
'b' => array(), |
|
'blockquote' => array( |
|
'cite' => true, |
|
), |
|
'cite' => array(), |
|
'code' => array(), |
|
'del' => array( |
|
'datetime' => true, |
|
), |
|
'em' => array(), |
|
'i' => array(), |
|
'q' => array( |
|
'cite' => true, |
|
), |
|
's' => array(), |
|
'strike' => array(), |
|
'strong' => array(), |
|
); |
|
|
|
/** |
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* @var string[] $allowedentitynames Array of KSES allowed HTML entitity names. |
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* @since 1.0.0 |
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*/ |
|
$allowedentitynames = array( |
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'nbsp', |
|
'iexcl', |
|
'cent', |
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'pound', |
|
'curren', |
|
'yen', |
|
'brvbar', |
|
'sect', |
|
'uml', |
|
'copy', |
|
'ordf', |
|
'laquo', |
|
'not', |
|
'shy', |
|
'reg', |
|
'macr', |
|
'deg', |
|
'plusmn', |
|
'acute', |
|
'micro', |
|
'para', |
|
'middot', |
|
'cedil', |
|
'ordm', |
|
'raquo', |
|
'iquest', |
|
'Agrave', |
|
'Aacute', |
|
'Acirc', |
|
'Atilde', |
|
'Auml', |
|
'Aring', |
|
'AElig', |
|
'Ccedil', |
|
'Egrave', |
|
'Eacute', |
|
'Ecirc', |
|
'Euml', |
|
'Igrave', |
|
'Iacute', |
|
'Icirc', |
|
'Iuml', |
|
'ETH', |
|
'Ntilde', |
|
'Ograve', |
|
'Oacute', |
|
'Ocirc', |
|
'Otilde', |
|
'Ouml', |
|
'times', |
|
'Oslash', |
|
'Ugrave', |
|
'Uacute', |
|
'Ucirc', |
|
'Uuml', |
|
'Yacute', |
|
'THORN', |
|
'szlig', |
|
'agrave', |
|
'aacute', |
|
'acirc', |
|
'atilde', |
|
'auml', |
|
'aring', |
|
'aelig', |
|
'ccedil', |
|
'egrave', |
|
'eacute', |
|
'ecirc', |
|
'euml', |
|
'igrave', |
|
'iacute', |
|
'icirc', |
|
'iuml', |
|
'eth', |
|
'ntilde', |
|
'ograve', |
|
'oacute', |
|
'ocirc', |
|
'otilde', |
|
'ouml', |
|
'divide', |
|
'oslash', |
|
'ugrave', |
|
'uacute', |
|
'ucirc', |
|
'uuml', |
|
'yacute', |
|
'thorn', |
|
'yuml', |
|
'quot', |
|
'amp', |
|
'lt', |
|
'gt', |
|
'apos', |
|
'OElig', |
|
'oelig', |
|
'Scaron', |
|
'scaron', |
|
'Yuml', |
|
'circ', |
|
'tilde', |
|
'ensp', |
|
'emsp', |
|
'thinsp', |
|
'zwnj', |
|
'zwj', |
|
'lrm', |
|
'rlm', |
|
'ndash', |
|
'mdash', |
|
'lsquo', |
|
'rsquo', |
|
'sbquo', |
|
'ldquo', |
|
'rdquo', |
|
'bdquo', |
|
'dagger', |
|
'Dagger', |
|
'permil', |
|
'lsaquo', |
|
'rsaquo', |
|
'euro', |
|
'fnof', |
|
'Alpha', |
|
'Beta', |
|
'Gamma', |
|
'Delta', |
|
'Epsilon', |
|
'Zeta', |
|
'Eta', |
|
'Theta', |
|
'Iota', |
|
'Kappa', |
|
'Lambda', |
|
'Mu', |
|
'Nu', |
|
'Xi', |
|
'Omicron', |
|
'Pi', |
|
'Rho', |
|
'Sigma', |
|
'Tau', |
|
'Upsilon', |
|
'Phi', |
|
'Chi', |
|
'Psi', |
|
'Omega', |
|
'alpha', |
|
'beta', |
|
'gamma', |
|
'delta', |
|
'epsilon', |
|
'zeta', |
|
'eta', |
|
'theta', |
|
'iota', |
|
'kappa', |
|
'lambda', |
|
'mu', |
|
'nu', |
|
'xi', |
|
'omicron', |
|
'pi', |
|
'rho', |
|
'sigmaf', |
|
'sigma', |
|
'tau', |
|
'upsilon', |
|
'phi', |
|
'chi', |
|
'psi', |
|
'omega', |
|
'thetasym', |
|
'upsih', |
|
'piv', |
|
'bull', |
|
'hellip', |
|
'prime', |
|
'Prime', |
|
'oline', |
|
'frasl', |
|
'weierp', |
|
'image', |
|
'real', |
|
'trade', |
|
'alefsym', |
|
'larr', |
|
'uarr', |
|
'rarr', |
|
'darr', |
|
'harr', |
|
'crarr', |
|
'lArr', |
|
'uArr', |
|
'rArr', |
|
'dArr', |
|
'hArr', |
|
'forall', |
|
'part', |
|
'exist', |
|
'empty', |
|
'nabla', |
|
'isin', |
|
'notin', |
|
'ni', |
|
'prod', |
|
'sum', |
|
'minus', |
|
'lowast', |
|
'radic', |
|
'prop', |
|
'infin', |
|
'ang', |
|
'and', |
|
'or', |
|
'cap', |
|
'cup', |
|
'int', |
|
'sim', |
|
'cong', |
|
'asymp', |
|
'ne', |
|
'equiv', |
|
'le', |
|
'ge', |
|
'sub', |
|
'sup', |
|
'nsub', |
|
'sube', |
|
'supe', |
|
'oplus', |
|
'otimes', |
|
'perp', |
|
'sdot', |
|
'lceil', |
|
'rceil', |
|
'lfloor', |
|
'rfloor', |
|
'lang', |
|
'rang', |
|
'loz', |
|
'spades', |
|
'clubs', |
|
'hearts', |
|
'diams', |
|
'sup1', |
|
'sup2', |
|
'sup3', |
|
'frac14', |
|
'frac12', |
|
'frac34', |
|
'there4', |
|
); |
|
|
|
$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags ); |
|
} else { |
|
$allowedtags = wp_kses_array_lc( $allowedtags ); |
|
$allowedposttags = wp_kses_array_lc( $allowedposttags ); |
|
} |
|
|
|
/** |
|
* Filters text content and strips out disallowed HTML. |
|
* |
|
* This function makes sure that only the allowed HTML element names, attribute |
|
* names, attribute values, and HTML entities will occur in the given text string. |
|
* |
|
* This function expects unslashed data. |
|
* |
|
* @see wp_kses_post() for specifically filtering post content and fields. |
|
* @see wp_allowed_protocols() for the default allowed protocols in link URLs. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Text content to filter. |
|
* @param array[]|string $allowed_html An array of allowed HTML elements and attributes, or a |
|
* context name such as 'post'. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Filtered content containing only the allowed HTML. |
|
*/ |
|
function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) { |
|
if ( empty( $allowed_protocols ) ) { |
|
$allowed_protocols = wp_allowed_protocols(); |
|
} |
|
$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) ); |
|
$string = wp_kses_normalize_entities( $string ); |
|
$string = wp_kses_hook( $string, $allowed_html, $allowed_protocols ); |
|
return wp_kses_split( $string, $allowed_html, $allowed_protocols ); |
|
} |
|
|
|
/** |
|
* Filters one HTML attribute and ensures its value is allowed. |
|
* |
|
* This function can escape data in some situations where `wp_kses()` must strip the whole attribute. |
|
* |
|
* @since 4.2.3 |
|
* |
|
* @param string $string The 'whole' attribute, including name and value. |
|
* @param string $element The HTML element name to which the attribute belongs. |
|
* @return string Filtered attribute. |
|
*/ |
|
function wp_kses_one_attr( $string, $element ) { |
|
$uris = wp_kses_uri_attributes(); |
|
$allowed_html = wp_kses_allowed_html( 'post' ); |
|
$allowed_protocols = wp_allowed_protocols(); |
|
$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) ); |
|
|
|
// Preserve leading and trailing whitespace. |
|
$matches = array(); |
|
preg_match( '/^\s*/', $string, $matches ); |
|
$lead = $matches[0]; |
|
preg_match( '/\s*$/', $string, $matches ); |
|
$trail = $matches[0]; |
|
if ( empty( $trail ) ) { |
|
$string = substr( $string, strlen( $lead ) ); |
|
} else { |
|
$string = substr( $string, strlen( $lead ), -strlen( $trail ) ); |
|
} |
|
|
|
// Parse attribute name and value from input. |
|
$split = preg_split( '/\s*=\s*/', $string, 2 ); |
|
$name = $split[0]; |
|
if ( count( $split ) == 2 ) { |
|
$value = $split[1]; |
|
|
|
// Remove quotes surrounding $value. |
|
// Also guarantee correct quoting in $string for this one attribute. |
|
if ( '' == $value ) { |
|
$quote = ''; |
|
} else { |
|
$quote = $value[0]; |
|
} |
|
if ( '"' == $quote || "'" == $quote ) { |
|
if ( substr( $value, -1 ) != $quote ) { |
|
return ''; |
|
} |
|
$value = substr( $value, 1, -1 ); |
|
} else { |
|
$quote = '"'; |
|
} |
|
|
|
// Sanitize quotes, angle braces, and entities. |
|
$value = esc_attr( $value ); |
|
|
|
// Sanitize URI values. |
|
if ( in_array( strtolower( $name ), $uris ) ) { |
|
$value = wp_kses_bad_protocol( $value, $allowed_protocols ); |
|
} |
|
|
|
$string = "$name=$quote$value$quote"; |
|
$vless = 'n'; |
|
} else { |
|
$value = ''; |
|
$vless = 'y'; |
|
} |
|
|
|
// Sanitize attribute by name. |
|
wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html ); |
|
|
|
// Restore whitespace. |
|
return $lead . $string . $trail; |
|
} |
|
|
|
/** |
|
* Returns an array of allowed HTML tags and attributes for a given context. |
|
* |
|
* @since 3.5.0 |
|
* @since 5.0.1 `form` removed as allowable HTML tag. |
|
* |
|
* @global array $allowedposttags |
|
* @global array $allowedtags |
|
* @global array $allowedentitynames |
|
* |
|
* @param string|array $context The context for which to retrieve tags. Allowed values are 'post', |
|
* 'strip', 'data', 'entities', or the name of a field filter such as |
|
* 'pre_user_description'. |
|
* @return array Array of allowed HTML tags and their allowed attributes. |
|
*/ |
|
function wp_kses_allowed_html( $context = '' ) { |
|
global $allowedposttags, $allowedtags, $allowedentitynames; |
|
|
|
if ( is_array( $context ) ) { |
|
/** |
|
* Filters the HTML that is allowed for a given context. |
|
* |
|
* @since 3.5.0 |
|
* |
|
* @param array[]|string $context Context to judge allowed tags by. |
|
* @param string $context_type Context name. |
|
*/ |
|
return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' ); |
|
} |
|
|
|
switch ( $context ) { |
|
case 'post': |
|
/** This filter is documented in wp-includes/kses.php */ |
|
$tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); |
|
|
|
// 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`. |
|
if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) { |
|
$tags = $allowedposttags; |
|
|
|
$tags['form'] = array( |
|
'action' => true, |
|
'accept' => true, |
|
'accept-charset' => true, |
|
'enctype' => true, |
|
'method' => true, |
|
'name' => true, |
|
'target' => true, |
|
); |
|
|
|
/** This filter is documented in wp-includes/kses.php */ |
|
$tags = apply_filters( 'wp_kses_allowed_html', $tags, $context ); |
|
} |
|
|
|
return $tags; |
|
|
|
case 'user_description': |
|
case 'pre_user_description': |
|
$tags = $allowedtags; |
|
$tags['a']['rel'] = true; |
|
/** This filter is documented in wp-includes/kses.php */ |
|
return apply_filters( 'wp_kses_allowed_html', $tags, $context ); |
|
|
|
case 'strip': |
|
/** This filter is documented in wp-includes/kses.php */ |
|
return apply_filters( 'wp_kses_allowed_html', array(), $context ); |
|
|
|
case 'entities': |
|
/** This filter is documented in wp-includes/kses.php */ |
|
return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context ); |
|
|
|
case 'data': |
|
default: |
|
/** This filter is documented in wp-includes/kses.php */ |
|
return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); |
|
} |
|
} |
|
|
|
/** |
|
* You add any KSES hooks here. |
|
* |
|
* There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here. |
|
* All parameters are passed to the hooks and expected to receive a string. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Content to filter through KSES. |
|
* @param array[]|string $allowed_html List of allowed HTML elements. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Filtered content through {@see 'pre_kses'} hook. |
|
*/ |
|
function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) { |
|
/** |
|
* Filters content to be run through kses. |
|
* |
|
* @since 2.3.0 |
|
* |
|
* @param string $string Content to run through KSES. |
|
* @param array[]|string $allowed_html Allowed HTML elements. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
*/ |
|
return apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols ); |
|
} |
|
|
|
/** |
|
* Returns the version number of KSES. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @return string KSES version number. |
|
*/ |
|
function wp_kses_version() { |
|
return '0.2.2'; |
|
} |
|
|
|
/** |
|
* Searches for HTML tags, no matter how malformed. |
|
* |
|
* It also matches stray `>` characters. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @global array $pass_allowed_html |
|
* @global array $pass_allowed_protocols |
|
* |
|
* @param string $string Content to filter. |
|
* @param array $allowed_html Allowed HTML elements. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Content with fixed HTML tags |
|
*/ |
|
function wp_kses_split( $string, $allowed_html, $allowed_protocols ) { |
|
global $pass_allowed_html, $pass_allowed_protocols; |
|
$pass_allowed_html = $allowed_html; |
|
$pass_allowed_protocols = $allowed_protocols; |
|
return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string ); |
|
} |
|
|
|
/** |
|
* Helper function listing HTML attributes containing a URL. |
|
* |
|
* This function returns a list of all HTML attributes that must contain |
|
* a URL according to the HTML specification. |
|
* |
|
* This list includes URI attributes both allowed and disallowed by KSES. |
|
* |
|
* @link https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes |
|
* |
|
* @since 5.0.1 |
|
* |
|
* @return array HTML attributes that must include a URL. |
|
*/ |
|
function wp_kses_uri_attributes() { |
|
$uri_attributes = array( |
|
'action', |
|
'archive', |
|
'background', |
|
'cite', |
|
'classid', |
|
'codebase', |
|
'data', |
|
'formaction', |
|
'href', |
|
'icon', |
|
'longdesc', |
|
'manifest', |
|
'poster', |
|
'profile', |
|
'src', |
|
'usemap', |
|
'xmlns', |
|
); |
|
|
|
/** |
|
* Filters the list of attributes that are required to contain a URL. |
|
* |
|
* Use this filter to add any `data-` attributes that are required to be |
|
* validated as a URL. |
|
* |
|
* @since 5.0.1 |
|
* |
|
* @param array $uri_attributes HTML attributes requiring validation as a URL. |
|
*/ |
|
$uri_attributes = apply_filters( 'wp_kses_uri_attributes', $uri_attributes ); |
|
|
|
return $uri_attributes; |
|
} |
|
|
|
/** |
|
* Callback for `wp_kses_split()`. |
|
* |
|
* @since 3.1.0 |
|
* @access private |
|
* @ignore |
|
* |
|
* @global array $pass_allowed_html |
|
* @global array $pass_allowed_protocols |
|
* |
|
* @return string |
|
*/ |
|
function _wp_kses_split_callback( $match ) { |
|
global $pass_allowed_html, $pass_allowed_protocols; |
|
return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols ); |
|
} |
|
|
|
/** |
|
* Callback for `wp_kses_split()` for fixing malformed HTML tags. |
|
* |
|
* This function does a lot of work. It rejects some very malformed things like |
|
* `<:::>`. It returns an empty string, if the element isn't allowed (look ma, no |
|
* `strip_tags()`!). Otherwise it splits the tag into an element and an attribute |
|
* list. |
|
* |
|
* After the tag is split into an element and an attribute list, it is run |
|
* through another filter which will remove illegal attributes and once that is |
|
* completed, will be returned. |
|
* |
|
* @access private |
|
* @ignore |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Content to filter. |
|
* @param array $allowed_html Allowed HTML elements. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Fixed HTML element |
|
*/ |
|
function wp_kses_split2( $string, $allowed_html, $allowed_protocols ) { |
|
$string = wp_kses_stripslashes( $string ); |
|
|
|
// It matched a ">" character. |
|
if ( substr( $string, 0, 1 ) != '<' ) { |
|
return '>'; |
|
} |
|
|
|
// Allow HTML comments. |
|
if ( '<!--' == substr( $string, 0, 4 ) ) { |
|
$string = str_replace( array( '<!--', '-->' ), '', $string ); |
|
while ( $string != ( $newstring = wp_kses( $string, $allowed_html, $allowed_protocols ) ) ) { |
|
$string = $newstring; |
|
} |
|
if ( $string == '' ) { |
|
return ''; |
|
} |
|
// prevent multiple dashes in comments |
|
$string = preg_replace( '/--+/', '-', $string ); |
|
// prevent three dashes closing a comment |
|
$string = preg_replace( '/-$/', '', $string ); |
|
return "<!--{$string}-->"; |
|
} |
|
|
|
// It's seriously malformed. |
|
if ( ! preg_match( '%^<\s*(/\s*)?([a-zA-Z0-9-]+)([^>]*)>?$%', $string, $matches ) ) { |
|
return ''; |
|
} |
|
|
|
$slash = trim( $matches[1] ); |
|
$elem = $matches[2]; |
|
$attrlist = $matches[3]; |
|
|
|
if ( ! is_array( $allowed_html ) ) { |
|
$allowed_html = wp_kses_allowed_html( $allowed_html ); |
|
} |
|
|
|
// They are using a not allowed HTML element. |
|
if ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) { |
|
return ''; |
|
} |
|
|
|
// No attributes are allowed for closing elements. |
|
if ( $slash != '' ) { |
|
return "</$elem>"; |
|
} |
|
|
|
return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols ); |
|
} |
|
|
|
/** |
|
* Removes all attributes, if none are allowed for this element. |
|
* |
|
* If some are allowed it calls `wp_kses_hair()` to split them further, and then |
|
* it builds up new HTML code from the data that `kses_hair()` returns. It also |
|
* removes `<` and `>` characters, if there are any left. One more thing it does |
|
* is to check if the tag has a closing XHTML slash, and if it does, it puts one |
|
* in the returned code as well. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $element HTML element/tag. |
|
* @param string $attr HTML attributes from HTML element to closing HTML element tag. |
|
* @param array $allowed_html Allowed HTML elements. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Sanitized HTML element. |
|
*/ |
|
function wp_kses_attr( $element, $attr, $allowed_html, $allowed_protocols ) { |
|
if ( ! is_array( $allowed_html ) ) { |
|
$allowed_html = wp_kses_allowed_html( $allowed_html ); |
|
} |
|
|
|
// Is there a closing XHTML slash at the end of the attributes? |
|
$xhtml_slash = ''; |
|
if ( preg_match( '%\s*/\s*$%', $attr ) ) { |
|
$xhtml_slash = ' /'; |
|
} |
|
|
|
// Are any attributes allowed at all for this element? |
|
$element_low = strtolower( $element ); |
|
if ( empty( $allowed_html[ $element_low ] ) || true === $allowed_html[ $element_low ] ) { |
|
return "<$element$xhtml_slash>"; |
|
} |
|
|
|
// Split it |
|
$attrarr = wp_kses_hair( $attr, $allowed_protocols ); |
|
|
|
// Go through $attrarr, and save the allowed attributes for this element |
|
// in $attr2 |
|
$attr2 = ''; |
|
foreach ( $attrarr as $arreach ) { |
|
if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) { |
|
$attr2 .= ' ' . $arreach['whole']; |
|
} |
|
} |
|
|
|
// Remove any "<" or ">" characters |
|
$attr2 = preg_replace( '/[<>]/', '', $attr2 ); |
|
|
|
return "<$element$attr2$xhtml_slash>"; |
|
} |
|
|
|
/** |
|
* Determines whether an attribute is allowed. |
|
* |
|
* @since 4.2.3 |
|
* @since 5.0.0 Add support for `data-*` wildcard attributes. |
|
* |
|
* @param string $name The attribute name. Passed by reference. Returns empty string when not allowed. |
|
* @param string $value The attribute value. Passed by reference. Returns a filtered value. |
|
* @param string $whole The `name=value` input. Passed by reference. Returns filtered input. |
|
* @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. |
|
* @param string $element The name of the element to which this attribute belongs. |
|
* @param array $allowed_html The full list of allowed elements and attributes. |
|
* @return bool Whether or not the attribute is allowed. |
|
*/ |
|
function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) { |
|
$allowed_attr = $allowed_html[ strtolower( $element ) ]; |
|
|
|
$name_low = strtolower( $name ); |
|
if ( ! isset( $allowed_attr[ $name_low ] ) || '' == $allowed_attr[ $name_low ] ) { |
|
/* |
|
* Allow `data-*` attributes. |
|
* |
|
* When specifying `$allowed_html`, the attribute name should be set as |
|
* `data-*` (not to be mixed with the HTML 4.0 `data` attribute, see |
|
* https://www.w3.org/TR/html40/struct/objects.html#adef-data). |
|
* |
|
* Note: the attribute name should only contain `A-Za-z0-9_-` chars, |
|
* double hyphens `--` are not accepted by WordPress. |
|
*/ |
|
if ( strpos( $name_low, 'data-' ) === 0 && ! empty( $allowed_attr['data-*'] ) && preg_match( '/^data(?:-[a-z0-9_]+)+$/', $name_low, $match ) ) { |
|
/* |
|
* Add the whole attribute name to the allowed attributes and set any restrictions |
|
* for the `data-*` attribute values for the current element. |
|
*/ |
|
$allowed_attr[ $match[0] ] = $allowed_attr['data-*']; |
|
} else { |
|
$name = ''; |
|
$value = ''; |
|
$whole = ''; |
|
return false; |
|
} |
|
} |
|
|
|
if ( 'style' == $name_low ) { |
|
$new_value = safecss_filter_attr( $value ); |
|
|
|
if ( empty( $new_value ) ) { |
|
$name = ''; |
|
$value = ''; |
|
$whole = ''; |
|
return false; |
|
} |
|
|
|
$whole = str_replace( $value, $new_value, $whole ); |
|
$value = $new_value; |
|
} |
|
|
|
if ( is_array( $allowed_attr[ $name_low ] ) ) { |
|
// there are some checks |
|
foreach ( $allowed_attr[ $name_low ] as $currkey => $currval ) { |
|
if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) { |
|
$name = ''; |
|
$value = ''; |
|
$whole = ''; |
|
return false; |
|
} |
|
} |
|
} |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* Builds an attribute list from string containing attributes. |
|
* |
|
* This function does a lot of work. It parses an attribute list into an array |
|
* with attribute data, and tries to do the right thing even if it gets weird |
|
* input. It will add quotes around attribute values that don't have any quotes |
|
* or apostrophes around them, to make it easier to produce HTML code that will |
|
* conform to W3C's HTML specification. It will also remove bad URL protocols |
|
* from attribute values. It also reduces duplicate attributes by using the |
|
* attribute defined first (`foo='bar' foo='baz'` will result in `foo='bar'`). |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $attr Attribute list from HTML element to closing HTML element tag. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return array[] Array of attribute information after parsing. |
|
*/ |
|
function wp_kses_hair( $attr, $allowed_protocols ) { |
|
$attrarr = array(); |
|
$mode = 0; |
|
$attrname = ''; |
|
$uris = wp_kses_uri_attributes(); |
|
|
|
// Loop through the whole attribute list |
|
|
|
while ( strlen( $attr ) != 0 ) { |
|
$working = 0; // Was the last operation successful? |
|
|
|
switch ( $mode ) { |
|
case 0: |
|
if ( preg_match( '/^([-a-zA-Z:]+)/', $attr, $match ) ) { |
|
$attrname = $match[1]; |
|
$working = 1; |
|
$mode = 1; |
|
$attr = preg_replace( '/^[-a-zA-Z:]+/', '', $attr ); |
|
} |
|
|
|
break; |
|
|
|
case 1: |
|
if ( preg_match( '/^\s*=\s*/', $attr ) ) { // equals sign |
|
$working = 1; |
|
$mode = 2; |
|
$attr = preg_replace( '/^\s*=\s*/', '', $attr ); |
|
break; |
|
} |
|
|
|
if ( preg_match( '/^\s+/', $attr ) ) { // valueless |
|
$working = 1; |
|
$mode = 0; |
|
if ( false === array_key_exists( $attrname, $attrarr ) ) { |
|
$attrarr[ $attrname ] = array( |
|
'name' => $attrname, |
|
'value' => '', |
|
'whole' => $attrname, |
|
'vless' => 'y', |
|
); |
|
} |
|
$attr = preg_replace( '/^\s+/', '', $attr ); |
|
} |
|
|
|
break; |
|
|
|
case 2: |
|
if ( preg_match( '%^"([^"]*)"(\s+|/?$)%', $attr, $match ) ) { |
|
// "value" |
|
$thisval = $match[1]; |
|
if ( in_array( strtolower( $attrname ), $uris ) ) { |
|
$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); |
|
} |
|
|
|
if ( false === array_key_exists( $attrname, $attrarr ) ) { |
|
$attrarr[ $attrname ] = array( |
|
'name' => $attrname, |
|
'value' => $thisval, |
|
'whole' => "$attrname=\"$thisval\"", |
|
'vless' => 'n', |
|
); |
|
} |
|
$working = 1; |
|
$mode = 0; |
|
$attr = preg_replace( '/^"[^"]*"(\s+|$)/', '', $attr ); |
|
break; |
|
} |
|
|
|
if ( preg_match( "%^'([^']*)'(\s+|/?$)%", $attr, $match ) ) { |
|
// 'value' |
|
$thisval = $match[1]; |
|
if ( in_array( strtolower( $attrname ), $uris ) ) { |
|
$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); |
|
} |
|
|
|
if ( false === array_key_exists( $attrname, $attrarr ) ) { |
|
$attrarr[ $attrname ] = array( |
|
'name' => $attrname, |
|
'value' => $thisval, |
|
'whole' => "$attrname='$thisval'", |
|
'vless' => 'n', |
|
); |
|
} |
|
$working = 1; |
|
$mode = 0; |
|
$attr = preg_replace( "/^'[^']*'(\s+|$)/", '', $attr ); |
|
break; |
|
} |
|
|
|
if ( preg_match( "%^([^\s\"']+)(\s+|/?$)%", $attr, $match ) ) { |
|
// value |
|
$thisval = $match[1]; |
|
if ( in_array( strtolower( $attrname ), $uris ) ) { |
|
$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); |
|
} |
|
|
|
if ( false === array_key_exists( $attrname, $attrarr ) ) { |
|
$attrarr[ $attrname ] = array( |
|
'name' => $attrname, |
|
'value' => $thisval, |
|
'whole' => "$attrname=\"$thisval\"", |
|
'vless' => 'n', |
|
); |
|
} |
|
// We add quotes to conform to W3C's HTML spec. |
|
$working = 1; |
|
$mode = 0; |
|
$attr = preg_replace( "%^[^\s\"']+(\s+|$)%", '', $attr ); |
|
} |
|
|
|
break; |
|
} // switch |
|
|
|
if ( $working == 0 ) { // not well formed, remove and try again |
|
$attr = wp_kses_html_error( $attr ); |
|
$mode = 0; |
|
} |
|
} // while |
|
|
|
if ( $mode == 1 && false === array_key_exists( $attrname, $attrarr ) ) { |
|
// special case, for when the attribute list ends with a valueless |
|
// attribute like "selected" |
|
$attrarr[ $attrname ] = array( |
|
'name' => $attrname, |
|
'value' => '', |
|
'whole' => $attrname, |
|
'vless' => 'y', |
|
); |
|
} |
|
|
|
return $attrarr; |
|
} |
|
|
|
/** |
|
* Finds all attributes of an HTML element. |
|
* |
|
* Does not modify input. May return "evil" output. |
|
* |
|
* Based on `wp_kses_split2()` and `wp_kses_attr()`. |
|
* |
|
* @since 4.2.3 |
|
* |
|
* @param string $element HTML element. |
|
* @return array|bool List of attributes found in the element. Returns false on failure. |
|
*/ |
|
function wp_kses_attr_parse( $element ) { |
|
$valid = preg_match( '%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches ); |
|
if ( 1 !== $valid ) { |
|
return false; |
|
} |
|
|
|
$begin = $matches[1]; |
|
$slash = $matches[2]; |
|
$elname = $matches[3]; |
|
$attr = $matches[4]; |
|
$end = $matches[5]; |
|
|
|
if ( '' !== $slash ) { |
|
// Closing elements do not get parsed. |
|
return false; |
|
} |
|
|
|
// Is there a closing XHTML slash at the end of the attributes? |
|
if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) { |
|
$xhtml_slash = $matches[0]; |
|
$attr = substr( $attr, 0, -strlen( $xhtml_slash ) ); |
|
} else { |
|
$xhtml_slash = ''; |
|
} |
|
|
|
// Split it |
|
$attrarr = wp_kses_hair_parse( $attr ); |
|
if ( false === $attrarr ) { |
|
return false; |
|
} |
|
|
|
// Make sure all input is returned by adding front and back matter. |
|
array_unshift( $attrarr, $begin . $slash . $elname ); |
|
array_push( $attrarr, $xhtml_slash . $end ); |
|
|
|
return $attrarr; |
|
} |
|
|
|
/** |
|
* Builds an attribute list from string containing attributes. |
|
* |
|
* Does not modify input. May return "evil" output. |
|
* In case of unexpected input, returns false instead of stripping things. |
|
* |
|
* Based on `wp_kses_hair()` but does not return a multi-dimensional array. |
|
* |
|
* @since 4.2.3 |
|
* |
|
* @param string $attr Attribute list from HTML element to closing HTML element tag. |
|
* @return array|bool List of attributes found in $attr. Returns false on failure. |
|
*/ |
|
function wp_kses_hair_parse( $attr ) { |
|
if ( '' === $attr ) { |
|
return array(); |
|
} |
|
|
|
// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation |
|
$regex = |
|
'(?:' |
|
. '[-a-zA-Z:]+' // Attribute name. |
|
. '|' |
|
. '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html. |
|
. ')' |
|
. '(?:' // Attribute value. |
|
. '\s*=\s*' // All values begin with '=' |
|
. '(?:' |
|
. '"[^"]*"' // Double-quoted |
|
. '|' |
|
. "'[^']*'" // Single-quoted |
|
. '|' |
|
. '[^\s"\']+' // Non-quoted |
|
. '(?:\s|$)' // Must have a space |
|
. ')' |
|
. '|' |
|
. '(?:\s|$)' // If attribute has no value, space is required. |
|
. ')' |
|
. '\s*'; // Trailing space is optional except as mentioned above. |
|
// phpcs:enable |
|
|
|
// Although it is possible to reduce this procedure to a single regexp, |
|
// we must run that regexp twice to get exactly the expected result. |
|
|
|
$validation = "%^($regex)+$%"; |
|
$extraction = "%$regex%"; |
|
|
|
if ( 1 === preg_match( $validation, $attr ) ) { |
|
preg_match_all( $extraction, $attr, $attrarr ); |
|
return $attrarr[0]; |
|
} else { |
|
return false; |
|
} |
|
} |
|
|
|
/** |
|
* Performs different checks for attribute values. |
|
* |
|
* The currently implemented checks are "maxlen", "minlen", "maxval", "minval", |
|
* and "valueless". |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $value Attribute value. |
|
* @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. |
|
* @param string $checkname What $checkvalue is checking for. |
|
* @param mixed $checkvalue What constraint the value should pass. |
|
* @return bool Whether check passes. |
|
*/ |
|
function wp_kses_check_attr_val( $value, $vless, $checkname, $checkvalue ) { |
|
$ok = true; |
|
|
|
switch ( strtolower( $checkname ) ) { |
|
case 'maxlen': |
|
// The maxlen check makes sure that the attribute value has a length not |
|
// greater than the given value. This can be used to avoid Buffer Overflows |
|
// in WWW clients and various Internet servers. |
|
|
|
if ( strlen( $value ) > $checkvalue ) { |
|
$ok = false; |
|
} |
|
break; |
|
|
|
case 'minlen': |
|
// The minlen check makes sure that the attribute value has a length not |
|
// smaller than the given value. |
|
|
|
if ( strlen( $value ) < $checkvalue ) { |
|
$ok = false; |
|
} |
|
break; |
|
|
|
case 'maxval': |
|
// The maxval check does two things: it checks that the attribute value is |
|
// an integer from 0 and up, without an excessive amount of zeroes or |
|
// whitespace (to avoid Buffer Overflows). It also checks that the attribute |
|
// value is not greater than the given value. |
|
// This check can be used to avoid Denial of Service attacks. |
|
|
|
if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { |
|
$ok = false; |
|
} |
|
if ( $value > $checkvalue ) { |
|
$ok = false; |
|
} |
|
break; |
|
|
|
case 'minval': |
|
// The minval check makes sure that the attribute value is a positive integer, |
|
// and that it is not smaller than the given value. |
|
|
|
if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { |
|
$ok = false; |
|
} |
|
if ( $value < $checkvalue ) { |
|
$ok = false; |
|
} |
|
break; |
|
|
|
case 'valueless': |
|
// The valueless check makes sure if the attribute has a value |
|
// (like `<a href="blah">`) or not (`<option selected>`). If the given value |
|
// is a "y" or a "Y", the attribute must not have a value. |
|
// If the given value is an "n" or an "N", the attribute must have a value. |
|
|
|
if ( strtolower( $checkvalue ) != $vless ) { |
|
$ok = false; |
|
} |
|
break; |
|
} // switch |
|
|
|
return $ok; |
|
} |
|
|
|
/** |
|
* Sanitizes a string and removed disallowed URL protocols. |
|
* |
|
* This function removes all non-allowed protocols from the beginning of the |
|
* string. It ignores whitespace and the case of the letters, and it does |
|
* understand HTML entities. It does its work recursively, so it won't be |
|
* fooled by a string like `javascript:javascript:alert(57)`. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Content to filter bad protocols from. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Filtered content. |
|
*/ |
|
function wp_kses_bad_protocol( $string, $allowed_protocols ) { |
|
$string = wp_kses_no_null( $string ); |
|
$iterations = 0; |
|
|
|
do { |
|
$original_string = $string; |
|
$string = wp_kses_bad_protocol_once( $string, $allowed_protocols ); |
|
} while ( $original_string != $string && ++$iterations < 6 ); |
|
|
|
if ( $original_string != $string ) { |
|
return ''; |
|
} |
|
|
|
return $string; |
|
} |
|
|
|
/** |
|
* Removes any invalid control characters in a text string. |
|
* |
|
* Also removes any instance of the `\0` string. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Content to filter null characters from. |
|
* @param array $options Set 'slash_zero' => 'keep' when '\0' is allowed. Default is 'remove'. |
|
* @return string Filtered content. |
|
*/ |
|
function wp_kses_no_null( $string, $options = null ) { |
|
if ( ! isset( $options['slash_zero'] ) ) { |
|
$options = array( 'slash_zero' => 'remove' ); |
|
} |
|
|
|
$string = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string ); |
|
if ( 'remove' == $options['slash_zero'] ) { |
|
$string = preg_replace( '/\\\\+0+/', '', $string ); |
|
} |
|
|
|
return $string; |
|
} |
|
|
|
/** |
|
* Strips slashes from in front of quotes. |
|
* |
|
* This function changes the character sequence `\"` to just `"`. It leaves all other |
|
* slashes alone. The quoting from `preg_replace(//e)` requires this. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string String to strip slashes from. |
|
* @return string Fixed string with quoted slashes. |
|
*/ |
|
function wp_kses_stripslashes( $string ) { |
|
return preg_replace( '%\\\\"%', '"', $string ); |
|
} |
|
|
|
/** |
|
* Converts the keys of an array to lowercase. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param array $inarray Unfiltered array. |
|
* @return array Fixed array with all lowercase keys. |
|
*/ |
|
function wp_kses_array_lc( $inarray ) { |
|
$outarray = array(); |
|
|
|
foreach ( (array) $inarray as $inkey => $inval ) { |
|
$outkey = strtolower( $inkey ); |
|
$outarray[ $outkey ] = array(); |
|
|
|
foreach ( (array) $inval as $inkey2 => $inval2 ) { |
|
$outkey2 = strtolower( $inkey2 ); |
|
$outarray[ $outkey ][ $outkey2 ] = $inval2; |
|
} |
|
} |
|
|
|
return $outarray; |
|
} |
|
|
|
/** |
|
* Handles parsing errors in `wp_kses_hair()`. |
|
* |
|
* The general plan is to remove everything to and including some whitespace, |
|
* but it deals with quotes and apostrophes as well. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string |
|
* @return string |
|
*/ |
|
function wp_kses_html_error( $string ) { |
|
return preg_replace( '/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string ); |
|
} |
|
|
|
/** |
|
* Sanitizes content from bad protocols and other characters. |
|
* |
|
* This function searches for URL protocols at the beginning of the string, while |
|
* handling whitespace and HTML entities. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Content to check for bad protocols. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Sanitized content. |
|
*/ |
|
function wp_kses_bad_protocol_once( $string, $allowed_protocols, $count = 1 ) { |
|
$string = preg_replace( '/(�*58(?![;0-9])|�*3a(?![;a-f0-9]))/i', '$1;', $string ); |
|
$string2 = preg_split( '/:|�*58;|�*3a;/i', $string, 2 ); |
|
if ( isset( $string2[1] ) && ! preg_match( '%/\?%', $string2[0] ) ) { |
|
$string = trim( $string2[1] ); |
|
$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols ); |
|
if ( 'feed:' == $protocol ) { |
|
if ( $count > 2 ) { |
|
return ''; |
|
} |
|
$string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count ); |
|
if ( empty( $string ) ) { |
|
return $string; |
|
} |
|
} |
|
$string = $protocol . $string; |
|
} |
|
|
|
return $string; |
|
} |
|
|
|
/** |
|
* Callback for `wp_kses_bad_protocol_once()` regular expression. |
|
* |
|
* This function processes URL protocols, checks to see if they're in the |
|
* whitelist or not, and returns different data depending on the answer. |
|
* |
|
* @access private |
|
* @ignore |
|
* @since 1.0.0 |
|
* |
|
* @param string $string URI scheme to check against the whitelist. |
|
* @param string[] $allowed_protocols Array of allowed URL protocols. |
|
* @return string Sanitized content. |
|
*/ |
|
function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) { |
|
$string2 = wp_kses_decode_entities( $string ); |
|
$string2 = preg_replace( '/\s/', '', $string2 ); |
|
$string2 = wp_kses_no_null( $string2 ); |
|
$string2 = strtolower( $string2 ); |
|
|
|
$allowed = false; |
|
foreach ( (array) $allowed_protocols as $one_protocol ) { |
|
if ( strtolower( $one_protocol ) == $string2 ) { |
|
$allowed = true; |
|
break; |
|
} |
|
} |
|
|
|
if ( $allowed ) { |
|
return "$string2:"; |
|
} else { |
|
return ''; |
|
} |
|
} |
|
|
|
/** |
|
* Converts and fixes HTML entities. |
|
* |
|
* This function normalizes HTML entities. It will convert `AT&T` to the correct |
|
* `AT&T`, `:` to `:`, `&#XYZZY;` to `&#XYZZY;` and so on. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Content to normalize entities. |
|
* @return string Content with normalized entities. |
|
*/ |
|
function wp_kses_normalize_entities( $string ) { |
|
// Disarm all entities by converting & to & |
|
$string = str_replace( '&', '&', $string ); |
|
|
|
// Change back the allowed entities in our entity whitelist |
|
$string = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string ); |
|
$string = preg_replace_callback( '/&#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string ); |
|
$string = preg_replace_callback( '/&#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string ); |
|
|
|
return $string; |
|
} |
|
|
|
/** |
|
* Callback for `wp_kses_normalize_entities()` regular expression. |
|
* |
|
* This function only accepts valid named entity references, which are finite, |
|
* case-sensitive, and highly scrutinized by HTML and XML validators. |
|
* |
|
* @since 3.0.0 |
|
* |
|
* @global array $allowedentitynames |
|
* |
|
* @param array $matches preg_replace_callback() matches array. |
|
* @return string Correctly encoded entity. |
|
*/ |
|
function wp_kses_named_entities( $matches ) { |
|
global $allowedentitynames; |
|
|
|
if ( empty( $matches[1] ) ) { |
|
return ''; |
|
} |
|
|
|
$i = $matches[1]; |
|
return ( ! in_array( $i, $allowedentitynames ) ) ? "&$i;" : "&$i;"; |
|
} |
|
|
|
/** |
|
* Callback for `wp_kses_normalize_entities()` regular expression. |
|
* |
|
* This function helps `wp_kses_normalize_entities()` to only accept 16-bit |
|
* values and nothing more for `&#number;` entities. |
|
* |
|
* @access private |
|
* @ignore |
|
* @since 1.0.0 |
|
* |
|
* @param array $matches `preg_replace_callback()` matches array. |
|
* @return string Correctly encoded entity. |
|
*/ |
|
function wp_kses_normalize_entities2( $matches ) { |
|
if ( empty( $matches[1] ) ) { |
|
return ''; |
|
} |
|
|
|
$i = $matches[1]; |
|
if ( valid_unicode( $i ) ) { |
|
$i = str_pad( ltrim( $i, '0' ), 3, '0', STR_PAD_LEFT ); |
|
$i = "&#$i;"; |
|
} else { |
|
$i = "&#$i;"; |
|
} |
|
|
|
return $i; |
|
} |
|
|
|
/** |
|
* Callback for `wp_kses_normalize_entities()` for regular expression. |
|
* |
|
* This function helps `wp_kses_normalize_entities()` to only accept valid Unicode |
|
* numeric entities in hex form. |
|
* |
|
* @since 2.7.0 |
|
* @access private |
|
* @ignore |
|
* |
|
* @param array $matches `preg_replace_callback()` matches array. |
|
* @return string Correctly encoded entity. |
|
*/ |
|
function wp_kses_normalize_entities3( $matches ) { |
|
if ( empty( $matches[1] ) ) { |
|
return ''; |
|
} |
|
|
|
$hexchars = $matches[1]; |
|
return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';'; |
|
} |
|
|
|
/** |
|
* Determines if a Unicode codepoint is valid. |
|
* |
|
* @since 2.7.0 |
|
* |
|
* @param int $i Unicode codepoint. |
|
* @return bool Whether or not the codepoint is a valid Unicode codepoint. |
|
*/ |
|
function valid_unicode( $i ) { |
|
return ( $i == 0x9 || $i == 0xa || $i == 0xd || |
|
( $i >= 0x20 && $i <= 0xd7ff ) || |
|
( $i >= 0xe000 && $i <= 0xfffd ) || |
|
( $i >= 0x10000 && $i <= 0x10ffff ) ); |
|
} |
|
|
|
/** |
|
* Converts all numeric HTML entities to their named counterparts. |
|
* |
|
* This function decodes numeric HTML entities (`A` and `A`). |
|
* It doesn't do anything with named entities like `ä`, but we don't |
|
* need them in the URL protocol whitelisting system anyway. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $string Content to change entities. |
|
* @return string Content after decoded entities. |
|
*/ |
|
function wp_kses_decode_entities( $string ) { |
|
$string = preg_replace_callback( '/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string ); |
|
$string = preg_replace_callback( '/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string ); |
|
|
|
return $string; |
|
} |
|
|
|
/** |
|
* Regex callback for `wp_kses_decode_entities()`. |
|
* |
|
* @since 2.9.0 |
|
* @access private |
|
* @ignore |
|
* |
|
* @param array $match preg match |
|
* @return string |
|
*/ |
|
function _wp_kses_decode_entities_chr( $match ) { |
|
return chr( $match[1] ); |
|
} |
|
|
|
/** |
|
* Regex callback for `wp_kses_decode_entities()`. |
|
* |
|
* @since 2.9.0 |
|
* @access private |
|
* @ignore |
|
* |
|
* @param array $match preg match |
|
* @return string |
|
*/ |
|
function _wp_kses_decode_entities_chr_hexdec( $match ) { |
|
return chr( hexdec( $match[1] ) ); |
|
} |
|
|
|
/** |
|
* Sanitize content with allowed HTML KSES rules. |
|
* |
|
* This function expects slashed data. |
|
* |
|
* @since 1.0.0 |
|
* |
|
* @param string $data Content to filter, expected to be escaped with slashes. |
|
* @return string Filtered content. |
|
*/ |
|
function wp_filter_kses( $data ) { |
|
return addslashes( wp_kses( stripslashes( $data ), current_filter() ) ); |
|
} |
|
|
|
/** |
|
* Sanitize content with allowed HTML KSES rules. |
|
* |
|
* This function expects unslashed data. |
|
* |
|
* @since 2.9.0 |
|
* |
|
* @param string $data Content to filter, expected to not be escaped. |
|
* @return string Filtered content. |
|
*/ |
|
function wp_kses_data( $data ) { |
|
return wp_kses( $data, current_filter() ); |
|
} |
|
|
|
/** |
|
* Sanitizes content for allowed HTML tags for post content. |
|
* |
|
* Post content refers to the page contents of the 'post' type and not `$_POST` |
|
* data from forms. |
|
* |
|
* This function expects slashed data. |
|
* |
|
* @since 2.0.0 |
|
* |
|
* @param string $data Post content to filter, expected to be escaped with slashes. |
|
* @return string Filtered post content with allowed HTML tags and attributes intact. |
|
*/ |
|
function wp_filter_post_kses( $data ) { |
|
return addslashes( wp_kses( stripslashes( $data ), 'post' ) ); |
|
} |
|
|
|
/** |
|
* Sanitizes content for allowed HTML tags for post content. |
|
* |
|
* Post content refers to the page contents of the 'post' type and not `$_POST` |
|
* data from forms. |
|
* |
|
* This function expects unslashed data. |
|
* |
|
* @since 2.9.0 |
|
* |
|
* @param string $data Post content to filter. |
|
* @return string Filtered post content with allowed HTML tags and attributes intact. |
|
*/ |
|
function wp_kses_post( $data ) { |
|
return wp_kses( $data, 'post' ); |
|
} |
|
|
|
/** |
|
* Navigates through an array, object, or scalar, and sanitizes content for |
|
* allowed HTML tags for post content. |
|
* |
|
* @since 4.4.2 |
|
* |
|
* @see map_deep() |
|
* |
|
* @param mixed $data The array, object, or scalar value to inspect. |
|
* @return mixed The filtered content. |
|
*/ |
|
function wp_kses_post_deep( $data ) { |
|
return map_deep( $data, 'wp_kses_post' ); |
|
} |
|
|
|
/** |
|
* Strips all HTML from a text string. |
|
* |
|
* This function expects slashed data. |
|
* |
|
* @since 2.1.0 |
|
* |
|
* @param string $data Content to strip all HTML from. |
|
* @return string Filtered content without any HTML. |
|
*/ |
|
function wp_filter_nohtml_kses( $data ) { |
|
return addslashes( wp_kses( stripslashes( $data ), 'strip' ) ); |
|
} |
|
|
|
/** |
|
* Adds all KSES input form content filters. |
|
* |
|
* All hooks have default priority. The `wp_filter_kses()` function is added to |
|
* the 'pre_comment_content' and 'title_save_pre' hooks. |
|
* |
|
* The `wp_filter_post_kses()` function is added to the 'content_save_pre', |
|
* 'excerpt_save_pre', and 'content_filtered_save_pre' hooks. |
|
* |
|
* @since 2.0.0 |
|
*/ |
|
function kses_init_filters() { |
|
// Normal filtering |
|
add_filter( 'title_save_pre', 'wp_filter_kses' ); |
|
|
|
// Comment filtering |
|
if ( current_user_can( 'unfiltered_html' ) ) { |
|
add_filter( 'pre_comment_content', 'wp_filter_post_kses' ); |
|
} else { |
|
add_filter( 'pre_comment_content', 'wp_filter_kses' ); |
|
} |
|
|
|
// Post filtering |
|
add_filter( 'content_save_pre', 'wp_filter_post_kses' ); |
|
add_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); |
|
add_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); |
|
} |
|
|
|
/** |
|
* Removes all KSES input form content filters. |
|
* |
|
* A quick procedural method to removing all of the filters that KSES uses for |
|
* content in WordPress Loop. |
|
* |
|
* Does not remove the `kses_init()` function from {@see 'init'} hook (priority is |
|
* default). Also does not remove `kses_init()` function from {@see 'set_current_user'} |
|
* hook (priority is also default). |
|
* |
|
* @since 2.0.6 |
|
*/ |
|
function kses_remove_filters() { |
|
// Normal filtering |
|
remove_filter( 'title_save_pre', 'wp_filter_kses' ); |
|
|
|
// Comment filtering |
|
remove_filter( 'pre_comment_content', 'wp_filter_post_kses' ); |
|
remove_filter( 'pre_comment_content', 'wp_filter_kses' ); |
|
|
|
// Post filtering |
|
remove_filter( 'content_save_pre', 'wp_filter_post_kses' ); |
|
remove_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); |
|
remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); |
|
} |
|
|
|
/** |
|
* Sets up most of the KSES filters for input form content. |
|
* |
|
* First removes all of the KSES filters in case the current user does not need |
|
* to have KSES filter the content. If the user does not have `unfiltered_html` |
|
* capability, then KSES filters are added. |
|
* |
|
* @since 2.0.0 |
|
*/ |
|
function kses_init() { |
|
kses_remove_filters(); |
|
|
|
if ( ! current_user_can( 'unfiltered_html' ) ) { |
|
kses_init_filters(); |
|
} |
|
} |
|
|
|
/** |
|
* Filters an inline style attribute and removes disallowed rules. |
|
* |
|
* @since 2.8.1 |
|
* |
|
* @param string $css A string of CSS rules. |
|
* @param string $deprecated Not used. |
|
* @return string Filtered string of CSS rules. |
|
*/ |
|
function safecss_filter_attr( $css, $deprecated = '' ) { |
|
if ( ! empty( $deprecated ) ) { |
|
_deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented |
|
} |
|
|
|
$css = wp_kses_no_null( $css ); |
|
$css = str_replace( array( "\n", "\r", "\t" ), '', $css ); |
|
|
|
$allowed_protocols = wp_allowed_protocols(); |
|
|
|
$css_array = explode( ';', trim( $css ) ); |
|
|
|
/** |
|
* Filters list of allowed CSS attributes. |
|
* |
|
* @since 2.8.1 |
|
* @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`. |
|
* @since 4.6.0 Added support for `list-style-type`. |
|
* @since 5.0.0 Added support for `background-image`. |
|
* @since 5.1.0 Added support for `text-transform`. |
|
* @since 5.2.0 Added support for `background-position` and `grid-template-columns` |
|
* @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties. |
|
* Extend `background-*` support of individual properties. |
|
* |
|
* @param string[] $attr Array of allowed CSS attributes. |
|
*/ |
|
$allowed_attr = apply_filters( |
|
'safe_style_css', |
|
array( |
|
'background', |
|
'background-color', |
|
'background-image', |
|
'background-position', |
|
'background-size', |
|
'background-attachment', |
|
'background-blend-mode', |
|
|
|
'border', |
|
'border-radius', |
|
'border-width', |
|
'border-color', |
|
'border-style', |
|
'border-right', |
|
'border-right-color', |
|
'border-right-style', |
|
'border-right-width', |
|
'border-bottom', |
|
'border-bottom-color', |
|
'border-bottom-style', |
|
'border-bottom-width', |
|
'border-left', |
|
'border-left-color', |
|
'border-left-style', |
|
'border-left-width', |
|
'border-top', |
|
'border-top-color', |
|
'border-top-style', |
|
'border-top-width', |
|
|
|
'border-spacing', |
|
'border-collapse', |
|
'caption-side', |
|
|
|
'columns', |
|
'column-count', |
|
'column-fill', |
|
'column-gap', |
|
'column-rule', |
|
'column-span', |
|
'column-width', |
|
|
|
'color', |
|
'font', |
|
'font-family', |
|
'font-size', |
|
'font-style', |
|
'font-variant', |
|
'font-weight', |
|
'letter-spacing', |
|
'line-height', |
|
'text-align', |
|
'text-decoration', |
|
'text-indent', |
|
'text-transform', |
|
|
|
'height', |
|
'min-height', |
|
'max-height', |
|
|
|
'width', |
|
'min-width', |
|
'max-width', |
|
|
|
'margin', |
|
'margin-right', |
|
'margin-bottom', |
|
'margin-left', |
|
'margin-top', |
|
|
|
'padding', |
|
'padding-right', |
|
'padding-bottom', |
|
'padding-left', |
|
'padding-top', |
|
|
|
'flex', |
|
'flex-basis', |
|
'flex-direction', |
|
'flex-flow', |
|
'flex-grow', |
|
'flex-shrink', |
|
|
|
'grid-template-columns', |
|
'grid-auto-columns', |
|
'grid-column-start', |
|
'grid-column-end', |
|
'grid-column-gap', |
|
'grid-template-rows', |
|
'grid-auto-rows', |
|
'grid-row-start', |
|
'grid-row-end', |
|
'grid-row-gap', |
|
'grid-gap', |
|
|
|
'justify-content', |
|
'justify-items', |
|
'justify-self', |
|
'align-content', |
|
'align-items', |
|
'align-self', |
|
|
|
'clear', |
|
'cursor', |
|
'direction', |
|
'float', |
|
'overflow', |
|
'vertical-align', |
|
'list-style-type', |
|
) |
|
); |
|
|
|
/* |
|
* CSS attributes that accept URL data types. |
|
* |
|
* This is in accordance to the CSS spec and unrelated to |
|
* the sub-set of supported attributes above. |
|
* |
|
* See: https://developer.mozilla.org/en-US/docs/Web/CSS/url |
|
*/ |
|
$css_url_data_types = array( |
|
'background', |
|
'background-image', |
|
|
|
'cursor', |
|
|
|
'list-style', |
|
'list-style-image', |
|
); |
|
|
|
if ( empty( $allowed_attr ) ) { |
|
return $css; |
|
} |
|
|
|
$css = ''; |
|
foreach ( $css_array as $css_item ) { |
|
if ( $css_item == '' ) { |
|
continue; |
|
} |
|
|
|
$css_item = trim( $css_item ); |
|
$css_test_string = $css_item; |
|
$found = false; |
|
$url_attr = false; |
|
|
|
if ( strpos( $css_item, ':' ) === false ) { |
|
$found = true; |
|
} else { |
|
$parts = explode( ':', $css_item, 2 ); |
|
$css_selector = trim( $parts[0] ); |
|
|
|
if ( in_array( $css_selector, $allowed_attr, true ) ) { |
|
$found = true; |
|
$url_attr = in_array( $css_selector, $css_url_data_types, true ); |
|
} |
|
} |
|
|
|
if ( $found && $url_attr ) { |
|
// Simplified: matches the sequence `url(*)`. |
|
preg_match_all( '/url\([^)]+\)/', $parts[1], $url_matches ); |
|
|
|
foreach ( $url_matches[0] as $url_match ) { |
|
// Clean up the URL from each of the matches above. |
|
preg_match( '/^url\(\s*([\'\"]?)(.*)(\g1)\s*\)$/', $url_match, $url_pieces ); |
|
|
|
if ( empty( $url_pieces[2] ) ) { |
|
$found = false; |
|
break; |
|
} |
|
|
|
$url = trim( $url_pieces[2] ); |
|
|
|
if ( empty( $url ) || $url !== wp_kses_bad_protocol( $url, $allowed_protocols ) ) { |
|
$found = false; |
|
break; |
|
} else { |
|
// Remove the whole `url(*)` bit that was matched above from the CSS. |
|
$css_test_string = str_replace( $url_match, '', $css_test_string ); |
|
} |
|
} |
|
} |
|
|
|
// Remove any CSS containing containing \ ( & } = or comments, except for url() useage checked above. |
|
if ( $found && ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string ) ) { |
|
if ( $css != '' ) { |
|
$css .= ';'; |
|
} |
|
|
|
$css .= $css_item; |
|
} |
|
} |
|
|
|
return $css; |
|
} |
|
|
|
/** |
|
* Helper function to add global attributes to a tag in the allowed html list. |
|
* |
|
* @since 3.5.0 |
|
* @since 5.0.0 Add support for `data-*` wildcard attributes. |
|
* @access private |
|
* @ignore |
|
* |
|
* @param array $value An array of attributes. |
|
* @return array The array of attributes with global attributes added. |
|
*/ |
|
function _wp_add_global_attributes( $value ) { |
|
$global_attributes = array( |
|
'aria-describedby' => true, |
|
'aria-details' => true, |
|
'aria-label' => true, |
|
'aria-labelledby' => true, |
|
'aria-hidden' => true, |
|
'class' => true, |
|
'id' => true, |
|
'style' => true, |
|
'title' => true, |
|
'role' => true, |
|
'data-*' => true, |
|
); |
|
|
|
if ( true === $value ) { |
|
$value = array(); |
|
} |
|
|
|
if ( is_array( $value ) ) { |
|
return array_merge( $value, $global_attributes ); |
|
} |
|
|
|
return $value; |
|
}
|
|
|