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4228 lines (3840 loc) · 119 KB
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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.
*
* When using this constant, make sure to set all of these globals to arrays:
*
* - `$allowedposttags`
* - `$allowedtags`
* - `$allowedentitynames`
* - `$allowedxmlentitynames`
*
* @see wp_kses_allowed_html()
* @since 1.2.0
*
* @var array[]|false 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, $allowedxmlentitynames;
/**
* Indicates which implementation of {@see \wp_kses()} is running.
*
* Nominally `legacy` unless temporarily-switched for {@see \wp_sanitize_html_kses()}.
* It’s safe to latch this into `legacy`.
*
* @global 'legacy'|'html-api' $wp_kses_operating_mode
*
* @since 7.2.0
*/
global $wp_kses_operating_mode;
$wp_kses_operating_mode = 'legacy';
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,
),
'aside' => array(
'align' => true,
),
'audio' => array(
'autoplay' => true,
'controls' => true,
'loop' => true,
'muted' => true,
'preload' => true,
'src' => true,
),
'b' => array(),
'bdo' => array(),
'big' => array(),
'blockquote' => array(
'cite' => true,
),
'br' => array(),
'button' => array(
'command' => true,
'commandfor' => true,
'disabled' => true,
'name' => true,
'type' => true,
'value' => true,
'popovertarget' => true,
'popovertargetaction' => true,
'aria-haspopup' => true,
),
'caption' => array(
'align' => true,
),
'cite' => array(),
'code' => array(),
'col' => array(
'align' => true,
'char' => true,
'charoff' => true,
'span' => true,
'valign' => true,
'width' => true,
),
'colgroup' => array(
'align' => true,
'char' => true,
'charoff' => true,
'span' => true,
'valign' => true,
'width' => true,
),
'data' => array(
'value' => true,
),
'del' => array(
'datetime' => true,
),
'dd' => array(),
'dfn' => array(),
'details' => array(
'align' => true,
'open' => true,
'name' => true,
),
'div' => array(
'align' => true,
'popover' => true,
),
'dialog' => array(
'closedby' => true,
'open' => true,
'popover' => true,
'autofocus' => true,
),
'dl' => array(),
'dt' => array(),
'em' => array(),
'fieldset' => array(),
'figure' => array(
'align' => true,
),
'figcaption' => array(
'align' => true,
),
'font' => array(
'color' => true,
'face' => true,
'size' => true,
),
'footer' => array(
'align' => 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,
),
'hgroup' => array(
'align' => 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,
'loading' => 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,
),
'main' => array(
'align' => true,
),
'map' => array(
'name' => true,
),
'mark' => array(),
'menu' => array(
'type' => true,
),
'meter' => array(
'high' => true,
'low' => true,
'max' => true,
'min' => true,
'optimum' => true,
'value' => true,
),
'nav' => array(
'align' => true,
),
'object' => array(
'data' => array(
'required' => true,
'value_callback' => '_wp_kses_allow_pdf_objects',
),
'type' => array(
'required' => true,
'values' => array( 'application/pdf' ),
),
),
'p' => array(
'align' => true,
),
'pre' => array(
'width' => true,
),
'progress' => array(
'max' => true,
'value' => true,
),
'q' => array(
'cite' => true,
),
'rb' => array(),
'rp' => array(),
'rt' => array(),
'rtc' => array(),
'ruby' => array(),
's' => array(),
'samp' => array(),
'search' => array(),
'span' => array(
'align' => true,
),
'section' => array(
'align' => true,
),
'small' => array(),
'strike' => array(),
'strong' => array(),
'sub' => array(),
'summary' => array(
'align' => true,
),
'sup' => array(),
'table' => array(
'align' => true,
'bgcolor' => true,
'border' => true,
'cellpadding' => true,
'cellspacing' => 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,
'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,
),
'time' => array(
'datetime' => 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,
'popover' => true,
'role' => true,
),
'ol' => array(
'start' => true,
'type' => true,
'reversed' => true,
),
'var' => array(),
'video' => array(
'autoplay' => true,
'controls' => true,
'height' => true,
'loop' => true,
'muted' => true,
'playsinline' => true,
'poster' => true,
'preload' => true,
'src' => true,
'width' => true,
),
'wbr' => array(),
);
// https://www.w3.org/TR/mathml-core/#global-attributes
// Except common attributes added by _wp_add_global_attributes.
$math_global_attributes = array(
'displaystyle' => true,
'scriptlevel' => true,
'mathbackground' => true,
'mathcolor' => true,
'mathsize' => true,
// Common attributes also defined by _wp_add_global_attributes.
// We do not want to add all those global attributes though.
'class' => true,
'data-*' => true,
'dir' => true,
'id' => true,
'style' => true,
);
$math_overunder_attributes = array(
'accentunder' => true,
'accent' => true,
);
$allowedposttags = array_merge(
$allowedposttags,
array(
// https://www.w3.org/TR/mathml-core/#the-top-level-math-element
'math' => array_merge(
$math_global_attributes,
array(
'display' => true,
)
),
// https://www.w3.org/TR/mathml-core/#token-elements
// https://www.w3.org/TR/mathml-core/#text-mtext
'mtext' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#the-mi-element
'mi' => array_merge(
$math_global_attributes,
array(
'mathvariant' => true,
)
),
// https://www.w3.org/TR/mathml-core/#number-mn
'mn' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#operator-fence-separator-or-accent-mo
'mo' => array_merge(
$math_global_attributes,
array(
'form' => true,
'fence' => true,
'separator' => true,
'lspace' => true,
'rspace' => true,
'stretchy' => true,
'symmetric' => true,
'maxsize' => true,
'minsize' => true,
'largeop' => true,
'movablelimits' => true,
)
),
// https://www.w3.org/TR/mathml-core/#space-mspace
'mspace' => array_merge(
$math_global_attributes,
array(
'width' => true,
'height' => true,
'depth' => true,
)
),
// https://www.w3.org/TR/mathml-core/#string-literal-ms
'ms' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#general-layout-schemata
// https://www.w3.org/TR/mathml-core/#horizontally-group-sub-expressions-mrow
'mrow' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#fractions-mfrac
'mfrac' => array_merge(
$math_global_attributes,
array(
'linethickness' => true,
)
),
// https://www.w3.org/TR/mathml-core/#radicals-msqrt-mroot
'msqrt' => $math_global_attributes,
'mroot' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#style-change-mstyle
'mstyle' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#error-message-merror
'merror' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#adjust-space-around-content-mpadded
'mpadded' => array_merge(
$math_global_attributes,
array(
'width' => true,
'height' => true,
'depth' => true,
'lspace' => true,
'voffset' => true,
)
),
// https://www.w3.org/TR/mathml-core/#making-sub-expressions-invisible-mphantom
'mphantom' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#script-and-limit-schemata
// https://www.w3.org/TR/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup
'msub' => $math_global_attributes,
'msup' => $math_global_attributes,
'msubsup' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#underscripts-and-overscripts-munder-mover-munderover
'munder' => array_merge( $math_global_attributes, $math_overunder_attributes ),
'mover' => array_merge( $math_global_attributes, $math_overunder_attributes ),
'munderover' => array_merge( $math_global_attributes, $math_overunder_attributes ),
// https://www.w3.org/TR/mathml-core/#prescripts-and-tensor-indices-mmultiscripts
'mmultiscripts' => $math_global_attributes,
'mprescripts' => $math_global_attributes,
// https://www.w3.org/TR/mathml-core/#tabular-math
// https://www.w3.org/TR/mathml-core/#table-or-matrix-mtable
'mtable' => array_merge(
$math_global_attributes,
array(
// Non-standard, used by temml/katex.
// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtable
'columnalign' => true,
'rowspacing' => true,
'columnspacing' => true,
'align' => true,
'rowalign' => true,
'columnlines' => true,
'rowlines' => true,
'frame' => true,
'framespacing' => true,
'width' => true,
)
),
// https://www.w3.org/TR/mathml-core/#row-in-table-or-matrix-mtr
'mtr' => array_merge(
$math_global_attributes,
array(
// Non-standard, used by temml/katex.
// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtr
'columnalign' => true,
'rowalign' => true,
)
),
// https://www.w3.org/TR/mathml-core/#entry-in-table-or-matrix-mtd
'mtd' => array_merge(
$math_global_attributes,
array(
'columnspan' => true,
'rowspan' => true,
// Non-standard, used by temml/katex.
// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtd
'columnalign' => true,
'rowalign' => true,
)
),
// https://www.w3.org/TR/mathml-core/#semantics-and-presentation
'semantics' => $math_global_attributes,
'annotation' => array_merge(
$math_global_attributes,
array(
'encoding' => true,
)
),
// Non-standard but widely supported, used by temml/katex.
'menclose' => array_merge(
$math_global_attributes,
array(
'notation' => 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 entity 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',
);
/**
* @var string[] $allowedxmlentitynames Array of KSES allowed XML entity names.
* @since 5.5.0
*/
$allowedxmlentitynames = array(
'amp',
'lt',
'gt',
'apos',
'quot',
);
$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags );
} else {
$required_kses_globals = array(
'allowedposttags',
'allowedtags',
'allowedentitynames',
'allowedxmlentitynames',
);
$missing_kses_globals = array();
foreach ( $required_kses_globals as $global_name ) {
if ( ! isset( $GLOBALS[ $global_name ] ) || ! is_array( $GLOBALS[ $global_name ] ) ) {
$missing_kses_globals[] = '<code>$' . $global_name . '</code>';
}
}
if ( $missing_kses_globals ) {
_doing_it_wrong(
'wp_kses_allowed_html',
sprintf(
/* translators: 1: CUSTOM_TAGS, 2: Global variable names. */
__( 'When using the %1$s constant, make sure to set these globals to an array: %2$s.' ),
'<code>CUSTOM_TAGS</code>',
implode( ', ', $missing_kses_globals )
),
'6.2.0'
);
}
$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.
*
* @see 'wp_kses_force_legacy_parser' to opt-out of the new HTML-API-based implementation.
*
* @since 1.0.0
* @since 7.2.0 Rewritten with the HTML API for more reliable parsing.
*
* @global string $wp_kses_operating_mode
*
* @param string $content Text content to filter.
* @param array[]|string $allowed_html An array of allowed HTML elements and attributes,
* or a context name such as 'post'. {@see wp_kses_allowed_html()}
* for the list of accepted context names.
* @param string[] $allowed_protocols Optional. Array of allowed URL protocols.
* Defaults to the result of wp_allowed_protocols().
* @return string Filtered content containing only the allowed HTML.
*/
function wp_kses( $content, $allowed_html, $allowed_protocols = array() ) {
global $wp_kses_operating_mode;
/**
* Filters whether to rely on the legacy parsing inside `wp_kses()`.
*
* @since 7.2.0
*
* @param bool $force_legacy_parser Whether to force using the legacy parser
* instead of relying on the HTML API.
*/
if ( ! apply_filters( 'wp_kses_force_legacy_parser', true ) ) {
return wp_sanitize_html_kses( (string) $content, $allowed_html, $allowed_protocols );
}
if ( empty( $allowed_protocols ) ) {
$allowed_protocols = wp_allowed_protocols();
}
$content = wp_kses_no_null( $content, array( 'slash_zero' => 'keep' ) );
$content = wp_kses_normalize_entities( $content );