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7932193708
This reduces the number of `WordPress.PHP.StrictComparisons.LooseComparison` issues in half, from 1897 to 890. Includes minor code layout fixes for better readability. See #49542. Built from https://develop.svn.wordpress.org/trunk@47808 git-svn-id: http://core.svn.wordpress.org/trunk@47584 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2352 lines
58 KiB
PHP
2352 lines
58 KiB
PHP
<?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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// 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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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,
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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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'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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'thead' => 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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'title' => array(),
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'tr' => array(
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'align' => true,
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'bgcolor' => 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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'track' => array(
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'default' => true,
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'kind' => true,
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'label' => true,
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'src' => true,
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'srclang' => true,
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),
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'tt' => array(),
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'u' => array(),
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'ul' => array(
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'type' => true,
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),
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'ol' => array(
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'start' => true,
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'type' => true,
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'reversed' => true,
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),
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'var' => array(),
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'video' => array(
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'autoplay' => true,
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'controls' => true,
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'height' => true,
|
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'loop' => true,
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'muted' => true,
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'poster' => true,
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'preload' => true,
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'src' => true,
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'width' => true,
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),
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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,
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'title' => true,
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),
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'abbr' => array(
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'title' => true,
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),
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'acronym' => array(
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'title' => true,
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),
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'b' => array(),
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'blockquote' => array(
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'cite' => true,
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),
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'cite' => array(),
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'code' => array(),
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'del' => array(
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'datetime' => true,
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),
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'em' => array(),
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'i' => array(),
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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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'strike' => array(),
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'strong' => array(),
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);
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/**
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* @var string[] $allowedentitynames Array of KSES allowed HTML entitity names.
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* @since 1.0.0
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*/
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$allowedentitynames = array(
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'nbsp',
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'iexcl',
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'cent',
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'pound',
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'curren',
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'yen',
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'brvbar',
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'sect',
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'uml',
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'copy',
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'ordf',
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'laquo',
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'not',
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'shy',
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'reg',
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'macr',
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'deg',
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'plusmn',
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'acute',
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'micro',
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'para',
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'middot',
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'cedil',
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'ordm',
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'raquo',
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'iquest',
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'Agrave',
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'Aacute',
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'Acirc',
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'Atilde',
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'Auml',
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'Aring',
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'AElig',
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'Ccedil',
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'Egrave',
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'Eacute',
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'Ecirc',
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|
'Euml',
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|
'Igrave',
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'Iacute',
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'Icirc',
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|
'Iuml',
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'ETH',
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|
'Ntilde',
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|
'Ograve',
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|
'Oacute',
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|
'Ocirc',
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|
'Otilde',
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|
'Ouml',
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|
'times',
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|
'Oslash',
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|
'Ugrave',
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'Uacute',
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'Ucirc',
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|
'Uuml',
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'Yacute',
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|
'THORN',
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|
'szlig',
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|
'agrave',
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|
'aacute',
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|
'acirc',
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|
'atilde',
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|
'auml',
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|
'aring',
|
|
'aelig',
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|
'ccedil',
|
|
'egrave',
|
|
'eacute',
|
|
'ecirc',
|
|
'euml',
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|
'igrave',
|
|
'iacute',
|
|
'icirc',
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|
'iuml',
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|
'eth',
|
|
'ntilde',
|
|
'ograve',
|
|
'oacute',
|
|
'ocirc',
|
|
'otilde',
|
|
'ouml',
|
|
'divide',
|
|
'oslash',
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|
'ugrave',
|
|
'uacute',
|
|
'ucirc',
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|
'uuml',
|
|
'yacute',
|
|
'thorn',
|
|
'yuml',
|
|
'quot',
|
|
'amp',
|
|
'lt',
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|
'gt',
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|
'apos',
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|
'OElig',
|
|
'oelig',
|
|
'Scaron',
|
|
'scaron',
|
|
'Yuml',
|
|
'circ',
|
|
'tilde',
|
|
'ensp',
|
|
'emsp',
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|
'thinsp',
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|
'zwnj',
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|
'zwj',
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|
'lrm',
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|
'rlm',
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|
'ndash',
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|
'mdash',
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|
'lsquo',
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|
'rsquo',
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|
'sbquo',
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|
'ldquo',
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|
'rdquo',
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|
'bdquo',
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|
'dagger',
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'Dagger',
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'permil',
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|
'lsaquo',
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|
'rsaquo',
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|
'euro',
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|
'fnof',
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|
'Alpha',
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'Beta',
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|
'Gamma',
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|
'Delta',
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|
'Epsilon',
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|
'Zeta',
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|
'Eta',
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|
'Theta',
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|
'Iota',
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|
'Kappa',
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|
'Lambda',
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|
'Mu',
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|
'Nu',
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|
'Xi',
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|
'Omicron',
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|
'Pi',
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|
'Rho',
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|
'Sigma',
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|
'Tau',
|
|
'Upsilon',
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|
'Phi',
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|
'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, true ) ) {
|
|
$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 );
|
|
}
|
|
|
|
/**
|
|
* Returns an array of HTML attribute names whose value contains 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 string[] HTML attribute names whose value contains 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 string[] $uri_attributes HTML attribute names whose value contains 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 ( ( $newstring = wp_kses( $string, $allowed_html, $allowed_protocols ) ) != $string ) {
|
|
$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 ) {
|
|
$name_low = strtolower( $name );
|
|
$element_low = strtolower( $element );
|
|
|
|
if ( ! isset( $allowed_html[ $element_low ] ) ) {
|
|
$name = '';
|
|
$value = '';
|
|
$whole = '';
|
|
return false;
|
|
}
|
|
|
|
$allowed_attr = $allowed_html[ $element_low ];
|
|
|
|
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, true ) ) {
|
|
$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, true ) ) {
|
|
$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, true ) ) {
|
|
$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;
|
|
} // End switch.
|
|
|
|
if ( 0 == $working ) { // Not well-formed, remove and try again.
|
|
$attr = wp_kses_html_error( $attr );
|
|
$mode = 0;
|
|
}
|
|
} // End while.
|
|
|
|
if ( 1 == $mode && 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;
|
|
} // End 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, $allowedentitynames, true ) ) ? "&$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 ( 0x9 == $i || 0xa == $i || 0xd == $i ||
|
|
( 0x20 <= $i && $i <= 0xd7ff ) ||
|
|
( 0xe000 <= $i && $i <= 0xfffd ) ||
|
|
( 0x10000 <= $i && $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.
|
|
* @since 5.3.1 Added support for gradient backgrounds.
|
|
*
|
|
* @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',
|
|
);
|
|
|
|
/*
|
|
* CSS attributes that accept gradient data types.
|
|
*
|
|
*/
|
|
$css_gradient_data_types = array(
|
|
'background',
|
|
'background-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;
|
|
$gradient_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 );
|
|
$gradient_attr = in_array( $css_selector, $css_gradient_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 ) || wp_kses_bad_protocol( $url, $allowed_protocols ) !== $url ) {
|
|
$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 );
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( $found && $gradient_attr ) {
|
|
$css_value = trim( $parts[1] );
|
|
if ( preg_match( '/^(repeating-)?(linear|radial|conic)-gradient\(([^()]|rgb[a]?\([^()]*\))*\)$/', $css_value ) ) {
|
|
// Remove the whole `gradient` bit that was matched above from the CSS.
|
|
$css_test_string = str_replace( $css_value, '', $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;
|
|
}
|