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authorCharles Cabergs <me@cacharle.xyz>2020-07-27 10:05:23 +0200
committerCharles Cabergs <me@cacharle.xyz>2020-07-27 10:05:23 +0200
commit5bf66662a9bdd62c5bccab15e607cd95cfb8fcab (patch)
tree39a1a4629749056191c05dfd899f931701b7acf3 /srcs/wordpress/wp-includes/kses.php
parent5afd237bbd22028b85532b8c0b3fcead49a00764 (diff)
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Removed wordpress and phpmyadmin, my server doesn't handle it well and it brings shame on my famillyHEADmaster
Diffstat (limited to 'srcs/wordpress/wp-includes/kses.php')
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diff --git a/srcs/wordpress/wp-includes/kses.php b/srcs/wordpress/wp-includes/kses.php
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-<?php
-/**
- * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
- * Copyright (C) 2002, 2003, 2005 Ulf Harnhammar
- *
- * This program is free software and open source software; you can redistribute
- * it and/or modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the License,
- * or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
- * http://www.gnu.org/licenses/gpl.html
- *
- * [kses strips evil scripts!]
- *
- * Added wp_ prefix to avoid conflicts with existing kses users
- *
- * @version 0.2.2
- * @copyright (C) 2002, 2003, 2005
- * @author Ulf Harnhammar <http://advogato.org/person/metaur/>
- *
- * @package External
- * @subpackage KSES
- */
-
-/**
- * Specifies the default allowable HTML tags.
- *
- * Using `CUSTOM_TAGS` is not recommended and should be considered deprecated. The
- * {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context.
- *
- * @see wp_kses_allowed_html()
- * @since 1.2.0
- *
- * @var array[]|bool Array of default allowable HTML tags, or false to use the defaults.
- */
-if ( ! defined( 'CUSTOM_TAGS' ) ) {
- define( 'CUSTOM_TAGS', false );
-}
-
-// Ensure that these variables are added to the global namespace
-// (e.g. if using namespaces / autoload in the current PHP environment).
-global $allowedposttags, $allowedtags, $allowedentitynames;
-
-if ( ! CUSTOM_TAGS ) {
- /**
- * KSES global for default allowable HTML tags.
- *
- * Can be overridden with the `CUSTOM_TAGS` constant.
- *
- * @var array[] $allowedposttags Array of default allowable HTML tags.
- * @since 2.0.0
- */
- $allowedposttags = array(
- 'address' => array(),
- 'a' => array(
- 'href' => true,
- 'rel' => true,
- 'rev' => true,
- 'name' => true,
- 'target' => true,
- 'download' => array(
- 'valueless' => 'y',
- ),
- ),
- 'abbr' => array(),
- 'acronym' => array(),
- 'area' => array(
- 'alt' => true,
- 'coords' => true,
- 'href' => true,
- 'nohref' => true,
- 'shape' => true,
- 'target' => true,
- ),
- 'article' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'aside' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'audio' => array(
- 'autoplay' => true,
- 'controls' => true,
- 'loop' => true,
- 'muted' => true,
- 'preload' => true,
- 'src' => true,
- ),
- 'b' => array(),
- 'bdo' => array(
- 'dir' => true,
- ),
- 'big' => array(),
- 'blockquote' => array(
- 'cite' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'br' => array(),
- 'button' => array(
- 'disabled' => true,
- 'name' => true,
- 'type' => true,
- 'value' => true,
- ),
- 'caption' => array(
- 'align' => true,
- ),
- 'cite' => array(
- 'dir' => true,
- 'lang' => true,
- ),
- 'code' => array(),
- 'col' => array(
- 'align' => true,
- 'char' => true,
- 'charoff' => true,
- 'span' => true,
- 'dir' => true,
- 'valign' => true,
- 'width' => true,
- ),
- 'colgroup' => array(
- 'align' => true,
- 'char' => true,
- 'charoff' => true,
- 'span' => true,
- 'valign' => true,
- 'width' => true,
- ),
- 'del' => array(
- 'datetime' => true,
- ),
- 'dd' => array(),
- 'dfn' => array(),
- 'details' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'open' => true,
- 'xml:lang' => true,
- ),
- 'div' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'dl' => array(),
- 'dt' => array(),
- 'em' => array(),
- 'fieldset' => array(),
- 'figure' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'figcaption' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'font' => array(
- 'color' => true,
- 'face' => true,
- 'size' => true,
- ),
- 'footer' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'h1' => array(
- 'align' => true,
- ),
- 'h2' => array(
- 'align' => true,
- ),
- 'h3' => array(
- 'align' => true,
- ),
- 'h4' => array(
- 'align' => true,
- ),
- 'h5' => array(
- 'align' => true,
- ),
- 'h6' => array(
- 'align' => true,
- ),
- 'header' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'hgroup' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'hr' => array(
- 'align' => true,
- 'noshade' => true,
- 'size' => true,
- 'width' => true,
- ),
- 'i' => array(),
- 'img' => array(
- 'alt' => true,
- 'align' => true,
- 'border' => true,
- 'height' => true,
- 'hspace' => true,
- 'longdesc' => true,
- 'vspace' => true,
- 'src' => true,
- 'usemap' => true,
- 'width' => true,
- ),
- 'ins' => array(
- 'datetime' => true,
- 'cite' => true,
- ),
- 'kbd' => array(),
- 'label' => array(
- 'for' => true,
- ),
- 'legend' => array(
- 'align' => true,
- ),
- 'li' => array(
- 'align' => true,
- 'value' => true,
- ),
- 'map' => array(
- 'name' => true,
- ),
- 'mark' => array(),
- 'menu' => array(
- 'type' => true,
- ),
- 'nav' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'p' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'pre' => array(
- 'width' => true,
- ),
- 'q' => array(
- 'cite' => true,
- ),
- 's' => array(),
- 'samp' => array(),
- 'span' => array(
- 'dir' => true,
- 'align' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'section' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'small' => array(),
- 'strike' => array(),
- 'strong' => array(),
- 'sub' => array(),
- 'summary' => array(
- 'align' => true,
- 'dir' => true,
- 'lang' => true,
- 'xml:lang' => true,
- ),
- 'sup' => array(),
- 'table' => array(
- 'align' => true,
- 'bgcolor' => true,
- 'border' => true,
- 'cellpadding' => true,
- 'cellspacing' => true,
- 'dir' => true,
- 'rules' => true,
- 'summary' => true,
- 'width' => true,
- ),
- 'tbody' => array(
- 'align' => true,
- 'char' => true,
- 'charoff' => true,
- 'valign' => true,
- ),
- 'td' => array(
- 'abbr' => true,
- 'align' => true,
- 'axis' => true,
- 'bgcolor' => true,
- 'char' => true,
- 'charoff' => true,
- 'colspan' => true,
- 'dir' => true,
- 'headers' => true,
- 'height' => true,
- 'nowrap' => true,
- 'rowspan' => true,
- 'scope' => true,
- 'valign' => true,
- 'width' => true,
- ),
- 'textarea' => array(
- 'cols' => true,
- 'rows' => true,
- 'disabled' => true,
- 'name' => true,
- 'readonly' => true,
- ),
- 'tfoot' => array(
- 'align' => true,
- 'char' => true,
- 'charoff' => true,
- 'valign' => true,
- ),
- 'th' => array(
- 'abbr' => true,
- 'align' => true,
- 'axis' => true,
- 'bgcolor' => true,
- 'char' => true,
- 'charoff' => true,
- 'colspan' => true,
- 'headers' => true,
- 'height' => true,
- 'nowrap' => true,
- 'rowspan' => true,
- 'scope' => true,
- 'valign' => true,
- 'width' => true,
- ),
- 'thead' => array(
- 'align' => true,
- 'char' => true,
- 'charoff' => true,
- 'valign' => true,
- ),
- 'title' => array(),
- 'tr' => array(
- 'align' => true,
- '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,
- ),
- );
-
- /**
- * @var array[] $allowedtags Array of KSES allowed HTML elements.
- * @since 1.0.0
- */
- $allowedtags = array(
- 'a' => array(
- 'href' => true,
- 'title' => true,
- ),
- '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(),
- );
-
- /**
- * @var string[] $allowedentitynames Array of KSES allowed HTML entitity names.
- * @since 1.0.0
- */
- $allowedentitynames = array(
- 'nbsp',
- 'iexcl',
- 'cent',
- '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 '&gt;';
- }
-
- // 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( '/(&#0*58(?![;0-9])|&#x0*3a(?![;a-f0-9]))/i', '$1;', $string );
- $string2 = preg_split( '/:|&#0*58;|&#x0*3a;|&colon;/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&amp;T`, `&#00058;` to `&#58;`, `&#XYZZY;` to `&amp;#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 &amp;
- $string = str_replace( '&', '&amp;', $string );
-
- // Change back the allowed entities in our entity whitelist
- $string = preg_replace_callback( '/&amp;([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string );
- $string = preg_replace_callback( '/&amp;#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string );
- $string = preg_replace_callback( '/&amp;#[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, $allowedentitynames ) ) ? "&amp;$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 {
- $i = "&amp;#$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( $hexchars ) ) ) ? "&amp;#x$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 (`&#65;` and `&#x41;`).
- * It doesn't do anything with named entities like `&auml;`, 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 ) || $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 );
- }
- }
- }
-
- 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;
-}