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zecka/wp-kses-outside-wordpress.php

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wp_kses outside wordpress (Dirty copy of wp_kses)
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wp-kses-outside-wordpress.php
<?php
function get_charset()
{
return 'utf-8';
}
/**
* 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, 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 $context;
}
switch ($context) {
case 'post':
/** This filter is documented in wp-includes/kses.php */
$tags = $allowedposttags;
// 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`.
if (!CUSTOM_TAGS && !isset($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,
);
}
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 $tags;
case 'strip':
/** This filter is documented in wp-includes/kses.php */
return array();
case 'entities':
/** This filter is documented in wp-includes/kses.php */
return $allowedentitynames;
case 'data':
default:
/** This filter is documented in wp-includes/kses.php */
return $allowedtags;
}
}
/**
* 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 $string;
}
/**
* 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 = $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('<!--', '-->'), '', $string);
while (($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('/(&#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, $allowedentitynames, true)) ? "&amp;$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 (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 (`&#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), array()));
}
/**
* 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($data, array());
}
/**
* Sanitizes content for allowed HTML tags for post content.
*
* Post content refers to the page contents of the 'post' type and not `$_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()
{
// Do nothing, we are outside wordpress
}
/**
* 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()
{
// do nothing wer are outside wordpress
}
/**
* 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();
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 = '')
{
$css = wp_kses_no_null($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 =
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 $value;
}
function wp_allowed_protocols()
{
return array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'sms', 'svn', 'tel', 'fax', 'xmpp', 'webcal', 'urn');
}
function map_deep($value, $callback)
{
if (is_array($value)) {
foreach ($value as $index => $item) {
$value[$index] = map_deep($item, $callback);
}
} elseif (is_object($value)) {
$object_vars = get_object_vars($value);
foreach ($object_vars as $property_name => $property_value) {
$value->$property_name = map_deep($property_value, $callback);
}
} else {
$value = call_user_func($callback, $value);
}
return $value;
}
function esc_attr($text)
{
$safe_text = wp_check_invalid_utf8($text);
$safe_text = _wp_specialchars($safe_text, ENT_QUOTES);
/**
* Filters a string cleaned and escaped for output in an HTML attribute.
*
* Text passed to esc_attr() is stripped of invalid or special characters
* before output.
*
* @since 2.0.6
*
* @param string $safe_text The text after it has been escaped.
* @param string $text The text prior to being escaped.
*/
return $safe_text;
}
function wp_check_invalid_utf8($string, $strip = false)
{
$string = (string) $string;
if (0 === strlen($string)) {
return '';
}
// Store the site charset as a static to avoid multiple calls to get_option().
static $is_utf8 = null;
if (!isset($is_utf8)) {
$is_utf8 = in_array(get_charset(), array('utf8', 'utf-8', 'UTF8', 'UTF-8'));
}
if (!$is_utf8) {
return $string;
}
// Check for support for utf8 in the installed PCRE library once and store the result in a static.
static $utf8_pcre = null;
if (!isset($utf8_pcre)) {
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
$utf8_pcre = @preg_match('/^./u', 'a');
}
// We can't demand utf8 in the PCRE installation, so just return the string in those cases.
if (!$utf8_pcre) {
return $string;
}
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- preg_match fails when it encounters invalid UTF8 in $string.
if (1 === @preg_match('/^./us', $string)) {
return $string;
}
// Attempt to strip the bad chars if requested (not recommended).
if ($strip && function_exists('iconv')) {
return iconv('utf-8', 'utf-8', $string);
}
return '';
}
function _wp_specialchars($string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false)
{
$string = (string) $string;
if (0 === strlen($string)) {
return '';
}
// Don't bother if there are no specialchars - saves some processing.
if (!preg_match('/[&<>"\']/', $string)) {
return $string;
}
// Account for the previous behaviour of the function when the $quote_style is not an accepted value.
if (empty($quote_style)) {
$quote_style = ENT_NOQUOTES;
} elseif (!in_array($quote_style, array(0, 2, 3, 'single', 'double'), true)) {
$quote_style = ENT_QUOTES;
}
// Store the site charset as a static to avoid multiple calls to wp_load_alloptions().
if (!$charset) {
static $_charset = null;
if (!isset($_charset)) {
$_charset = get_charset();
}
$charset = $_charset;
}
if (in_array($charset, array('utf8', 'utf-8', 'UTF8'))) {
$charset = 'UTF-8';
}
$_quote_style = $quote_style;
if ('double' === $quote_style) {
$quote_style = ENT_COMPAT;
$_quote_style = ENT_COMPAT;
} elseif ('single' === $quote_style) {
$quote_style = ENT_NOQUOTES;
}
if (!$double_encode) {
// Guarantee every &entity; is valid, convert &garbage; into &amp;garbage;
// This is required for PHP < 5.4.0 because ENT_HTML401 flag is unavailable.
$string = wp_kses_normalize_entities($string);
}
$string = htmlspecialchars($string, $quote_style, $charset, $double_encode);
// Back-compat.
if ('single' === $_quote_style) {
$string = str_replace("'", '&#039;', $string);
}
return $string;
}
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