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/wp-includes/kses.php

https://bitbucket.org/acipriani/madeinapulia.com
PHP | 1545 lines | 952 code | 115 blank | 478 comment | 89 complexity | 48088a5167f4d99976ae72b40cc28d0f MD5 | raw file
   1<?php
   2/**
   3 * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
   4 * Copyright (C) 2002, 2003, 2005  Ulf Harnhammar
   5 *
   6 * This program is free software and open source software; you can redistribute
   7 * it and/or modify it under the terms of the GNU General Public License as
   8 * published by the Free Software Foundation; either version 2 of the License,
   9 * or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful, but WITHOUT
  12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  14 * more details.
  15 *
  16 * You should have received a copy of the GNU General Public License along
  17 * with this program; if not, write to the Free Software Foundation, Inc.,
  18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19 * http://www.gnu.org/licenses/gpl.html
  20 *
  21 * [kses strips evil scripts!]
  22 *
  23 * Added wp_ prefix to avoid conflicts with existing kses users
  24 *
  25 * @version 0.2.2
  26 * @copyright (C) 2002, 2003, 2005
  27 * @author Ulf Harnhammar <http://advogato.org/person/metaur/>
  28 *
  29 * @package External
  30 * @subpackage KSES
  31 *
  32 */
  33
  34/**
  35 * You can override this in a plugin.
  36 *
  37 * The wp_kses_allowed_html filter is more powerful and supplies context.
  38 * CUSTOM_TAGS is not recommended and should be considered deprecated.
  39 *
  40 * @see wp_kses_allowed_html()
  41 *
  42 * @since 1.2.0
  43 */
  44if ( ! defined( 'CUSTOM_TAGS' ) )
  45	define( 'CUSTOM_TAGS', false );
  46
  47// Ensure that these variables are added to the global namespace
  48// (e.g. if using namespaces / autoload in the current PHP environment).
  49global $allowedposttags, $allowedtags, $allowedentitynames;
  50
  51if ( ! CUSTOM_TAGS ) {
  52	/**
  53	 * Kses global for default allowable HTML tags.
  54	 *
  55	 * Can be override by using CUSTOM_TAGS constant.
  56	 *
  57	 * @global array $allowedposttags
  58	 * @since 2.0.0
  59	 */
  60	$allowedposttags = array(
  61		'address' => array(),
  62		'a' => array(
  63			'href' => true,
  64			'rel' => true,
  65			'rev' => true,
  66			'name' => true,
  67			'target' => true,
  68		),
  69		'abbr' => array(),
  70		'acronym' => array(),
  71		'area' => array(
  72			'alt' => true,
  73			'coords' => true,
  74			'href' => true,
  75			'nohref' => true,
  76			'shape' => true,
  77			'target' => true,
  78		),
  79		'article' => array(
  80			'align' => true,
  81			'dir' => true,
  82			'lang' => true,
  83			'xml:lang' => true,
  84		),
  85		'aside' => array(
  86			'align' => true,
  87			'dir' => true,
  88			'lang' => true,
  89			'xml:lang' => true,
  90		),
  91		'audio' => array(
  92			'autoplay' => true,
  93			'controls' => true,
  94			'loop' => true,
  95			'muted' => true,
  96			'preload' => true,
  97			'src' => true,
  98		),
  99		'b' => array(),
 100		'big' => array(),
 101		'blockquote' => array(
 102			'cite' => true,
 103			'lang' => true,
 104			'xml:lang' => true,
 105		),
 106		'br' => array(),
 107		'button' => array(
 108			'disabled' => true,
 109			'name' => true,
 110			'type' => true,
 111			'value' => true,
 112		),
 113		'caption' => array(
 114			'align' => true,
 115		),
 116		'cite' => array(
 117			'dir' => true,
 118			'lang' => true,
 119		),
 120		'code' => array(),
 121		'col' => array(
 122			'align' => true,
 123			'char' => true,
 124			'charoff' => true,
 125			'span' => true,
 126			'dir' => true,
 127			'valign' => true,
 128			'width' => true,
 129		),
 130		'colgroup' => array(
 131			'align' => true,
 132			'char' => true,
 133			'charoff' => true,
 134			'span' => true,
 135			'valign' => true,
 136			'width' => true,
 137		),
 138		'del' => array(
 139			'datetime' => true,
 140		),
 141		'dd' => array(),
 142		'dfn' => array(),
 143		'details' => array(
 144			'align' => true,
 145			'dir' => true,
 146			'lang' => true,
 147			'open' => true,
 148			'xml:lang' => true,
 149		),
 150		'div' => array(
 151			'align' => true,
 152			'dir' => true,
 153			'lang' => true,
 154			'xml:lang' => true,
 155		),
 156		'dl' => array(),
 157		'dt' => array(),
 158		'em' => array(),
 159		'fieldset' => array(),
 160		'figure' => array(
 161			'align' => true,
 162			'dir' => true,
 163			'lang' => true,
 164			'xml:lang' => true,
 165		),
 166		'figcaption' => array(
 167			'align' => true,
 168			'dir' => true,
 169			'lang' => true,
 170			'xml:lang' => true,
 171		),
 172		'font' => array(
 173			'color' => true,
 174			'face' => true,
 175			'size' => true,
 176		),
 177		'footer' => array(
 178			'align' => true,
 179			'dir' => true,
 180			'lang' => true,
 181			'xml:lang' => true,
 182		),
 183		'form' => array(
 184			'action' => true,
 185			'accept' => true,
 186			'accept-charset' => true,
 187			'enctype' => true,
 188			'method' => true,
 189			'name' => true,
 190			'target' => true,
 191		),
 192		'h1' => array(
 193			'align' => true,
 194		),
 195		'h2' => array(
 196			'align' => true,
 197		),
 198		'h3' => array(
 199			'align' => true,
 200		),
 201		'h4' => array(
 202			'align' => true,
 203		),
 204		'h5' => array(
 205			'align' => true,
 206		),
 207		'h6' => array(
 208			'align' => true,
 209		),
 210		'header' => array(
 211			'align' => true,
 212			'dir' => true,
 213			'lang' => true,
 214			'xml:lang' => true,
 215		),
 216		'hgroup' => array(
 217			'align' => true,
 218			'dir' => true,
 219			'lang' => true,
 220			'xml:lang' => true,
 221		),
 222		'hr' => array(
 223			'align' => true,
 224			'noshade' => true,
 225			'size' => true,
 226			'width' => true,
 227		),
 228		'i' => array(),
 229		'img' => array(
 230			'alt' => true,
 231			'align' => true,
 232			'border' => true,
 233			'height' => true,
 234			'hspace' => true,
 235			'longdesc' => true,
 236			'vspace' => true,
 237			'src' => true,
 238			'usemap' => true,
 239			'width' => true,
 240		),
 241		'ins' => array(
 242			'datetime' => true,
 243			'cite' => true,
 244		),
 245		'kbd' => array(),
 246		'label' => array(
 247			'for' => true,
 248		),
 249		'legend' => array(
 250			'align' => true,
 251		),
 252		'li' => array(
 253			'align' => true,
 254			'value' => true,
 255		),
 256		'map' => array(
 257			'name' => true,
 258		),
 259		'mark' => array(),
 260		'menu' => array(
 261			'type' => true,
 262		),
 263		'nav' => array(
 264			'align' => true,
 265			'dir' => true,
 266			'lang' => true,
 267			'xml:lang' => true,
 268		),
 269		'p' => array(
 270			'align' => true,
 271			'dir' => true,
 272			'lang' => true,
 273			'xml:lang' => true,
 274		),
 275		'pre' => array(
 276			'width' => true,
 277		),
 278		'q' => array(
 279			'cite' => true,
 280		),
 281		's' => array(),
 282		'samp' => array(),
 283		'span' => array(
 284			'dir' => true,
 285			'align' => true,
 286			'lang' => true,
 287			'xml:lang' => true,
 288		),
 289		'section' => array(
 290			'align' => true,
 291			'dir' => true,
 292			'lang' => true,
 293			'xml:lang' => true,
 294		),
 295		'small' => array(),
 296		'strike' => array(),
 297		'strong' => array(),
 298		'sub' => array(),
 299		'summary' => array(
 300			'align' => true,
 301			'dir' => true,
 302			'lang' => true,
 303			'xml:lang' => true,
 304		),
 305		'sup' => array(),
 306		'table' => array(
 307			'align' => true,
 308			'bgcolor' => true,
 309			'border' => true,
 310			'cellpadding' => true,
 311			'cellspacing' => true,
 312			'dir' => true,
 313			'rules' => true,
 314			'summary' => true,
 315			'width' => true,
 316		),
 317		'tbody' => array(
 318			'align' => true,
 319			'char' => true,
 320			'charoff' => true,
 321			'valign' => true,
 322		),
 323		'td' => array(
 324			'abbr' => true,
 325			'align' => true,
 326			'axis' => true,
 327			'bgcolor' => true,
 328			'char' => true,
 329			'charoff' => true,
 330			'colspan' => true,
 331			'dir' => true,
 332			'headers' => true,
 333			'height' => true,
 334			'nowrap' => true,
 335			'rowspan' => true,
 336			'scope' => true,
 337			'valign' => true,
 338			'width' => true,
 339		),
 340		'textarea' => array(
 341			'cols' => true,
 342			'rows' => true,
 343			'disabled' => true,
 344			'name' => true,
 345			'readonly' => true,
 346		),
 347		'tfoot' => array(
 348			'align' => true,
 349			'char' => true,
 350			'charoff' => true,
 351			'valign' => true,
 352		),
 353		'th' => array(
 354			'abbr' => true,
 355			'align' => true,
 356			'axis' => true,
 357			'bgcolor' => true,
 358			'char' => true,
 359			'charoff' => true,
 360			'colspan' => true,
 361			'headers' => true,
 362			'height' => true,
 363			'nowrap' => true,
 364			'rowspan' => true,
 365			'scope' => true,
 366			'valign' => true,
 367			'width' => true,
 368		),
 369		'thead' => array(
 370			'align' => true,
 371			'char' => true,
 372			'charoff' => true,
 373			'valign' => true,
 374		),
 375		'title' => array(),
 376		'tr' => array(
 377			'align' => true,
 378			'bgcolor' => true,
 379			'char' => true,
 380			'charoff' => true,
 381			'valign' => true,
 382		),
 383		'track' => array(
 384			'default' => true,
 385			'kind' => true,
 386			'label' => true,
 387			'src' => true,
 388			'srclang' => true,
 389		),
 390		'tt' => array(),
 391		'u' => array(),
 392		'ul' => array(
 393			'type' => true,
 394		),
 395		'ol' => array(
 396			'start' => true,
 397			'type' => true,
 398		),
 399		'var' => array(),
 400		'video' => array(
 401			'autoplay' => true,
 402			'controls' => true,
 403			'height' => true,
 404			'loop' => true,
 405			'muted' => true,
 406			'poster' => true,
 407			'preload' => true,
 408			'src' => true,
 409			'width' => true,
 410		),
 411	);
 412
 413	/**
 414	 * Kses allowed HTML elements.
 415	 *
 416	 * @global array $allowedtags
 417	 * @since 1.0.0
 418	 */
 419	$allowedtags = array(
 420		'a' => array(
 421			'href' => true,
 422			'title' => true,
 423		),
 424		'abbr' => array(
 425			'title' => true,
 426		),
 427		'acronym' => array(
 428			'title' => true,
 429		),
 430		'b' => array(),
 431		'blockquote' => array(
 432			'cite' => true,
 433		),
 434		'cite' => array(),
 435		'code' => array(),
 436		'del' => array(
 437			'datetime' => true,
 438		),
 439		'em' => array(),
 440		'i' => array(),
 441		'q' => array(
 442			'cite' => true,
 443		),
 444		'strike' => array(),
 445		'strong' => array(),
 446	);
 447
 448	$allowedentitynames = array(
 449		'nbsp',    'iexcl',  'cent',    'pound',  'curren', 'yen',
 450		'brvbar',  'sect',   'uml',     'copy',   'ordf',   'laquo',
 451		'not',     'shy',    'reg',     'macr',   'deg',    'plusmn',
 452		'acute',   'micro',  'para',    'middot', 'cedil',  'ordm',
 453		'raquo',   'iquest', 'Agrave',  'Aacute', 'Acirc',  'Atilde',
 454		'Auml',    'Aring',  'AElig',   'Ccedil', 'Egrave', 'Eacute',
 455		'Ecirc',   'Euml',   'Igrave',  'Iacute', 'Icirc',  'Iuml',
 456		'ETH',     'Ntilde', 'Ograve',  'Oacute', 'Ocirc',  'Otilde',
 457		'Ouml',    'times',  'Oslash',  'Ugrave', 'Uacute', 'Ucirc',
 458		'Uuml',    'Yacute', 'THORN',   'szlig',  'agrave', 'aacute',
 459		'acirc',   'atilde', 'auml',    'aring',  'aelig',  'ccedil',
 460		'egrave',  'eacute', 'ecirc',   'euml',   'igrave', 'iacute',
 461		'icirc',   'iuml',   'eth',     'ntilde', 'ograve', 'oacute',
 462		'ocirc',   'otilde', 'ouml',    'divide', 'oslash', 'ugrave',
 463		'uacute',  'ucirc',  'uuml',    'yacute', 'thorn',  'yuml',
 464		'quot',    'amp',    'lt',      'gt',     'apos',   'OElig',
 465		'oelig',   'Scaron', 'scaron',  'Yuml',   'circ',   'tilde',
 466		'ensp',    'emsp',   'thinsp',  'zwnj',   'zwj',    'lrm',
 467		'rlm',     'ndash',  'mdash',   'lsquo',  'rsquo',  'sbquo',
 468		'ldquo',   'rdquo',  'bdquo',   'dagger', 'Dagger', 'permil',
 469		'lsaquo',  'rsaquo', 'euro',    'fnof',   'Alpha',  'Beta',
 470		'Gamma',   'Delta',  'Epsilon', 'Zeta',   'Eta',    'Theta',
 471		'Iota',    'Kappa',  'Lambda',  'Mu',     'Nu',     'Xi',
 472		'Omicron', 'Pi',     'Rho',     'Sigma',  'Tau',    'Upsilon',
 473		'Phi',     'Chi',    'Psi',     'Omega',  'alpha',  'beta',
 474		'gamma',   'delta',  'epsilon', 'zeta',   'eta',    'theta',
 475		'iota',    'kappa',  'lambda',  'mu',     'nu',     'xi',
 476		'omicron', 'pi',     'rho',     'sigmaf', 'sigma',  'tau',
 477		'upsilon', 'phi',    'chi',     'psi',    'omega',  'thetasym',
 478		'upsih',   'piv',    'bull',    'hellip', 'prime',  'Prime',
 479		'oline',   'frasl',  'weierp',  'image',  'real',   'trade',
 480		'alefsym', 'larr',   'uarr',    'rarr',   'darr',   'harr',
 481		'crarr',   'lArr',   'uArr',    'rArr',   'dArr',   'hArr',
 482		'forall',  'part',   'exist',   'empty',  'nabla',  'isin',
 483		'notin',   'ni',     'prod',    'sum',    'minus',  'lowast',
 484		'radic',   'prop',   'infin',   'ang',    'and',    'or',
 485		'cap',     'cup',    'int',     'sim',    'cong',   'asymp',
 486		'ne',      'equiv',  'le',      'ge',     'sub',    'sup',
 487		'nsub',    'sube',   'supe',    'oplus',  'otimes', 'perp',
 488		'sdot',    'lceil',  'rceil',   'lfloor', 'rfloor', 'lang',
 489		'rang',    'loz',    'spades',  'clubs',  'hearts', 'diams',
 490		'sup1',    'sup2',   'sup3',    'frac14', 'frac12', 'frac34',
 491		'there4',
 492	);
 493
 494	$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags );
 495} else {
 496	$allowedtags = wp_kses_array_lc( $allowedtags );
 497	$allowedposttags = wp_kses_array_lc( $allowedposttags );
 498}
 499
 500/**
 501 * Filters content and keeps only allowable HTML elements.
 502 *
 503 * This function makes sure that only the allowed HTML element names, attribute
 504 * names and attribute values plus only sane HTML entities will occur in
 505 * $string. You have to remove any slashes from PHP's magic quotes before you
 506 * call this function.
 507 *
 508 * The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news',
 509 * 'irc', 'gopher', 'nntp', 'feed', 'telnet, 'mms', 'rtsp' and 'svn'. This
 510 * covers all common link protocols, except for 'javascript' which should not
 511 * be allowed for untrusted users.
 512 *
 513 * @since 1.0.0
 514 *
 515 * @param string $string Content to filter through kses
 516 * @param array $allowed_html List of allowed HTML elements
 517 * @param array $allowed_protocols Optional. Allowed protocol in links.
 518 * @return string Filtered content with only allowed HTML elements
 519 */
 520function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {
 521	if ( empty( $allowed_protocols ) )
 522		$allowed_protocols = wp_allowed_protocols();
 523	$string = wp_kses_no_null($string);
 524	$string = wp_kses_js_entities($string);
 525	$string = wp_kses_normalize_entities($string);
 526	$string = wp_kses_hook($string, $allowed_html, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook
 527	return wp_kses_split($string, $allowed_html, $allowed_protocols);
 528}
 529
 530/**
 531 * Return a list of allowed tags and attributes for a given context.
 532 *
 533 * @since 3.5.0
 534 *
 535 * @param string $context The context for which to retrieve tags. Allowed values are
 536 *  post | strip | data | entities or the name of a field filter such as pre_user_description.
 537 * @return array List of allowed tags and their allowed attributes.
 538 */
 539function wp_kses_allowed_html( $context = '' ) {
 540	global $allowedposttags, $allowedtags, $allowedentitynames;
 541
 542	if ( is_array( $context ) ) {
 543		/**
 544		 * Filter HTML elements allowed for a given context.
 545		 *
 546		 * @since 3.5.0
 547		 *
 548		 * @param string $tags    Allowed tags, attributes, and/or entities.
 549		 * @param string $context Context to judge allowed tags by. Allowed values are 'post',
 550		 *                        'data', 'strip', 'entities', 'explicit', or the name of a filter.
 551		 */
 552		return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' );
 553	}
 554
 555	switch ( $context ) {
 556		case 'post':
 557			/** This filter is documented in wp-includes/kses.php */
 558			return apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );
 559			break;
 560		case 'user_description':
 561		case 'pre_user_description':
 562			$tags = $allowedtags;
 563			$tags['a']['rel'] = true;
 564			/** This filter is documented in wp-includes/kses.php */
 565			return apply_filters( 'wp_kses_allowed_html', $tags, $context );
 566			break;
 567		case 'strip':
 568			/** This filter is documented in wp-includes/kses.php */
 569			return apply_filters( 'wp_kses_allowed_html', array(), $context );
 570			break;
 571		case 'entities':
 572			/** This filter is documented in wp-includes/kses.php */
 573			return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context);
 574			break;
 575		case 'data':
 576		default:
 577			/** This filter is documented in wp-includes/kses.php */
 578			return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context );
 579	}
 580}
 581
 582/**
 583 * You add any kses hooks here.
 584 *
 585 * There is currently only one kses WordPress hook and it is called here. All
 586 * parameters are passed to the hooks and expected to receive a string.
 587 *
 588 * @since 1.0.0
 589 *
 590 * @param string $string Content to filter through kses
 591 * @param array $allowed_html List of allowed HTML elements
 592 * @param array $allowed_protocols Allowed protocol in links
 593 * @return string Filtered content through 'pre_kses' hook
 594 */
 595function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) {
 596	/**
 597	 * Filter content to be run through kses.
 598	 *
 599	 * @since 2.3.0
 600	 *
 601	 * @param string $string            Content to run through kses.
 602	 * @param array  $allowed_html      Allowed HTML elements.
 603	 * @param array  $allowed_protocols Allowed protocol in links.
 604	 */
 605	$string = apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols );
 606	return $string;
 607}
 608
 609/**
 610 * This function returns kses' version number.
 611 *
 612 * @since 1.0.0
 613 *
 614 * @return string KSES Version Number
 615 */
 616function wp_kses_version() {
 617	return '0.2.2';
 618}
 619
 620/**
 621 * Searches for HTML tags, no matter how malformed.
 622 *
 623 * It also matches stray ">" characters.
 624 *
 625 * @since 1.0.0
 626 *
 627 * @param string $string Content to filter
 628 * @param array $allowed_html Allowed HTML elements
 629 * @param array $allowed_protocols Allowed protocols to keep
 630 * @return string Content with fixed HTML tags
 631 */
 632function wp_kses_split( $string, $allowed_html, $allowed_protocols ) {
 633	global $pass_allowed_html, $pass_allowed_protocols;
 634	$pass_allowed_html = $allowed_html;
 635	$pass_allowed_protocols = $allowed_protocols;
 636	return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string );
 637}
 638
 639/**
 640 * Callback for wp_kses_split.
 641 *
 642 * @since 3.1.0
 643 * @access private
 644 */
 645function _wp_kses_split_callback( $match ) {
 646	global $pass_allowed_html, $pass_allowed_protocols;
 647	return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols );
 648}
 649
 650/**
 651 * Callback for wp_kses_split for fixing malformed HTML tags.
 652 *
 653 * This function does a lot of work. It rejects some very malformed things like
 654 * <:::>. It returns an empty string, if the element isn't allowed (look ma, no
 655 * strip_tags()!). Otherwise it splits the tag into an element and an attribute
 656 * list.
 657 *
 658 * After the tag is split into an element and an attribute list, it is run
 659 * through another filter which will remove illegal attributes and once that is
 660 * completed, will be returned.
 661 *
 662 * @access private
 663 * @since 1.0.0
 664 *
 665 * @param string $string Content to filter
 666 * @param array $allowed_html Allowed HTML elements
 667 * @param array $allowed_protocols Allowed protocols to keep
 668 * @return string Fixed HTML element
 669 */
 670function wp_kses_split2($string, $allowed_html, $allowed_protocols) {
 671	$string = wp_kses_stripslashes($string);
 672
 673	if (substr($string, 0, 1) != '<')
 674		return '&gt;';
 675	# It matched a ">" character
 676
 677	if ( '<!--' == substr( $string, 0, 4 ) ) {
 678		$string = str_replace( array('<!--', '-->'), '', $string );
 679		while ( $string != ($newstring = wp_kses($string, $allowed_html, $allowed_protocols)) )
 680			$string = $newstring;
 681		if ( $string == '' )
 682			return '';
 683		// prevent multiple dashes in comments
 684		$string = preg_replace('/--+/', '-', $string);
 685		// prevent three dashes closing a comment
 686		$string = preg_replace('/-$/', '', $string);
 687		return "<!--{$string}-->";
 688	}
 689	# Allow HTML comments
 690
 691	if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches))
 692		return '';
 693	# It's seriously malformed
 694
 695	$slash = trim($matches[1]);
 696	$elem = $matches[2];
 697	$attrlist = $matches[3];
 698
 699	if ( ! is_array( $allowed_html ) )
 700		$allowed_html = wp_kses_allowed_html( $allowed_html );
 701
 702	if ( ! isset($allowed_html[strtolower($elem)]) )
 703		return '';
 704	# They are using a not allowed HTML element
 705
 706	if ($slash != '')
 707		return "</$elem>";
 708	# No attributes are allowed for closing elements
 709
 710	return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols );
 711}
 712
 713/**
 714 * Removes all attributes, if none are allowed for this element.
 715 *
 716 * If some are allowed it calls wp_kses_hair() to split them further, and then
 717 * it builds up new HTML code from the data that kses_hair() returns. It also
 718 * removes "<" and ">" characters, if there are any left. One more thing it does
 719 * is to check if the tag has a closing XHTML slash, and if it does, it puts one
 720 * in the returned code as well.
 721 *
 722 * @since 1.0.0
 723 *
 724 * @param string $element HTML element/tag
 725 * @param string $attr HTML attributes from HTML element to closing HTML element tag
 726 * @param array $allowed_html Allowed HTML elements
 727 * @param array $allowed_protocols Allowed protocols to keep
 728 * @return string Sanitized HTML element
 729 */
 730function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
 731	# Is there a closing XHTML slash at the end of the attributes?
 732
 733	if ( ! is_array( $allowed_html ) )
 734		$allowed_html = wp_kses_allowed_html( $allowed_html );
 735
 736	$xhtml_slash = '';
 737	if (preg_match('%\s*/\s*$%', $attr))
 738		$xhtml_slash = ' /';
 739
 740	# Are any attributes allowed at all for this element?
 741	if ( ! isset($allowed_html[strtolower($element)]) || count($allowed_html[strtolower($element)]) == 0 )
 742		return "<$element$xhtml_slash>";
 743
 744	# Split it
 745	$attrarr = wp_kses_hair($attr, $allowed_protocols);
 746
 747	# Go through $attrarr, and save the allowed attributes for this element
 748	# in $attr2
 749	$attr2 = '';
 750
 751	$allowed_attr = $allowed_html[strtolower($element)];
 752	foreach ($attrarr as $arreach) {
 753		if ( ! isset( $allowed_attr[strtolower($arreach['name'])] ) )
 754			continue; # the attribute is not allowed
 755
 756		$current = $allowed_attr[strtolower($arreach['name'])];
 757		if ( $current == '' )
 758			continue; # the attribute is not allowed
 759
 760		if ( strtolower( $arreach['name'] ) == 'style' ) {
 761			$orig_value = $arreach['value'];
 762			$value = safecss_filter_attr( $orig_value );
 763
 764			if ( empty( $value ) )
 765				continue;
 766
 767			$arreach['value'] = $value;
 768			$arreach['whole'] = str_replace( $orig_value, $value, $arreach['whole'] );
 769		}
 770
 771		if ( ! is_array($current) ) {
 772			$attr2 .= ' '.$arreach['whole'];
 773		# there are no checks
 774
 775		} else {
 776			# there are some checks
 777			$ok = true;
 778			foreach ($current as $currkey => $currval) {
 779				if ( ! wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval) ) {
 780					$ok = false;
 781					break;
 782				}
 783			}
 784
 785			if ( $ok )
 786				$attr2 .= ' '.$arreach['whole']; # it passed them
 787		} # if !is_array($current)
 788	} # foreach
 789
 790	# Remove any "<" or ">" characters
 791	$attr2 = preg_replace('/[<>]/', '', $attr2);
 792
 793	return "<$element$attr2$xhtml_slash>";
 794}
 795
 796/**
 797 * Builds an attribute list from string containing attributes.
 798 *
 799 * This function does a lot of work. It parses an attribute list into an array
 800 * with attribute data, and tries to do the right thing even if it gets weird
 801 * input. It will add quotes around attribute values that don't have any quotes
 802 * or apostrophes around them, to make it easier to produce HTML code that will
 803 * conform to W3C's HTML specification. It will also remove bad URL protocols
 804 * from attribute values. It also reduces duplicate attributes by using the
 805 * attribute defined first (foo='bar' foo='baz' will result in foo='bar').
 806 *
 807 * @since 1.0.0
 808 *
 809 * @param string $attr Attribute list from HTML element to closing HTML element tag
 810 * @param array $allowed_protocols Allowed protocols to keep
 811 * @return array List of attributes after parsing
 812 */
 813function wp_kses_hair($attr, $allowed_protocols) {
 814	$attrarr = array();
 815	$mode = 0;
 816	$attrname = '';
 817	$uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
 818
 819	# Loop through the whole attribute list
 820
 821	while (strlen($attr) != 0) {
 822		$working = 0; # Was the last operation successful?
 823
 824		switch ($mode) {
 825			case 0 : # attribute name, href for instance
 826
 827				if ( preg_match('/^([-a-zA-Z:]+)/', $attr, $match ) ) {
 828					$attrname = $match[1];
 829					$working = $mode = 1;
 830					$attr = preg_replace( '/^[-a-zA-Z:]+/', '', $attr );
 831				}
 832
 833				break;
 834
 835			case 1 : # equals sign or valueless ("selected")
 836
 837				if (preg_match('/^\s*=\s*/', $attr)) # equals sign
 838					{
 839					$working = 1;
 840					$mode = 2;
 841					$attr = preg_replace('/^\s*=\s*/', '', $attr);
 842					break;
 843				}
 844
 845				if (preg_match('/^\s+/', $attr)) # valueless
 846					{
 847					$working = 1;
 848					$mode = 0;
 849					if(false === array_key_exists($attrname, $attrarr)) {
 850						$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
 851					}
 852					$attr = preg_replace('/^\s+/', '', $attr);
 853				}
 854
 855				break;
 856
 857			case 2 : # attribute value, a URL after href= for instance
 858
 859				if (preg_match('%^"([^"]*)"(\s+|/?$)%', $attr, $match))
 860					# "value"
 861					{
 862					$thisval = $match[1];
 863					if ( in_array(strtolower($attrname), $uris) )
 864						$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
 865
 866					if(false === array_key_exists($attrname, $attrarr)) {
 867						$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
 868					}
 869					$working = 1;
 870					$mode = 0;
 871					$attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
 872					break;
 873				}
 874
 875				if (preg_match("%^'([^']*)'(\s+|/?$)%", $attr, $match))
 876					# 'value'
 877					{
 878					$thisval = $match[1];
 879					if ( in_array(strtolower($attrname), $uris) )
 880						$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
 881
 882					if(false === array_key_exists($attrname, $attrarr)) {
 883						$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n');
 884					}
 885					$working = 1;
 886					$mode = 0;
 887					$attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
 888					break;
 889				}
 890
 891				if (preg_match("%^([^\s\"']+)(\s+|/?$)%", $attr, $match))
 892					# value
 893					{
 894					$thisval = $match[1];
 895					if ( in_array(strtolower($attrname), $uris) )
 896						$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
 897
 898					if(false === array_key_exists($attrname, $attrarr)) {
 899						$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
 900					}
 901					# We add quotes to conform to W3C's HTML spec.
 902					$working = 1;
 903					$mode = 0;
 904					$attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
 905				}
 906
 907				break;
 908		} # switch
 909
 910		if ($working == 0) # not well formed, remove and try again
 911		{
 912			$attr = wp_kses_html_error($attr);
 913			$mode = 0;
 914		}
 915	} # while
 916
 917	if ($mode == 1 && false === array_key_exists($attrname, $attrarr))
 918		# special case, for when the attribute list ends with a valueless
 919		# attribute like "selected"
 920		$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
 921
 922	return $attrarr;
 923}
 924
 925/**
 926 * Performs different checks for attribute values.
 927 *
 928 * The currently implemented checks are "maxlen", "minlen", "maxval", "minval"
 929 * and "valueless".
 930 *
 931 * @since 1.0.0
 932 *
 933 * @param string $value Attribute value
 934 * @param string $vless Whether the value is valueless. Use 'y' or 'n'
 935 * @param string $checkname What $checkvalue is checking for.
 936 * @param mixed $checkvalue What constraint the value should pass
 937 * @return bool Whether check passes
 938 */
 939function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) {
 940	$ok = true;
 941
 942	switch (strtolower($checkname)) {
 943		case 'maxlen' :
 944			# The maxlen check makes sure that the attribute value has a length not
 945			# greater than the given value. This can be used to avoid Buffer Overflows
 946			# in WWW clients and various Internet servers.
 947
 948			if (strlen($value) > $checkvalue)
 949				$ok = false;
 950			break;
 951
 952		case 'minlen' :
 953			# The minlen check makes sure that the attribute value has a length not
 954			# smaller than the given value.
 955
 956			if (strlen($value) < $checkvalue)
 957				$ok = false;
 958			break;
 959
 960		case 'maxval' :
 961			# The maxval check does two things: it checks that the attribute value is
 962			# an integer from 0 and up, without an excessive amount of zeroes or
 963			# whitespace (to avoid Buffer Overflows). It also checks that the attribute
 964			# value is not greater than the given value.
 965			# This check can be used to avoid Denial of Service attacks.
 966
 967			if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
 968				$ok = false;
 969			if ($value > $checkvalue)
 970				$ok = false;
 971			break;
 972
 973		case 'minval' :
 974			# The minval check makes sure that the attribute value is a positive integer,
 975			# and that it is not smaller than the given value.
 976
 977			if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
 978				$ok = false;
 979			if ($value < $checkvalue)
 980				$ok = false;
 981			break;
 982
 983		case 'valueless' :
 984			# The valueless check makes sure if the attribute has a value
 985			# (like <a href="blah">) or not (<option selected>). If the given value
 986			# is a "y" or a "Y", the attribute must not have a value.
 987			# If the given value is an "n" or an "N", the attribute must have one.
 988
 989			if (strtolower($checkvalue) != $vless)
 990				$ok = false;
 991			break;
 992	} # switch
 993
 994	return $ok;
 995}
 996
 997/**
 998 * Sanitize string from bad protocols.
 999 *
1000 * This function removes all non-allowed protocols from the beginning of
1001 * $string. It ignores whitespace and the case of the letters, and it does
1002 * understand HTML entities. It does its work in a while loop, so it won't be
1003 * fooled by a string like "javascript:javascript:alert(57)".
1004 *
1005 * @since 1.0.0
1006 *
1007 * @param string $string Content to filter bad protocols from
1008 * @param array $allowed_protocols Allowed protocols to keep
1009 * @return string Filtered content
1010 */
1011function wp_kses_bad_protocol($string, $allowed_protocols) {
1012	$string = wp_kses_no_null($string);
1013	$iterations = 0;
1014
1015	do {
1016		$original_string = $string;
1017		$string = wp_kses_bad_protocol_once($string, $allowed_protocols);
1018	} while ( $original_string != $string && ++$iterations < 6 );
1019
1020	if ( $original_string != $string )
1021		return '';
1022
1023	return $string;
1024}
1025
1026/**
1027 * Removes any invalid control characters in $string.
1028 *
1029 * Also removes any instance of the '\0' string.
1030 *
1031 * @since 1.0.0
1032 *
1033 * @param string $string
1034 * @return string
1035 */
1036function wp_kses_no_null($string) {
1037	$string = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string);
1038	$string = preg_replace('/(\\\\0)+/', '', $string);
1039
1040	return $string;
1041}
1042
1043/**
1044 * Strips slashes from in front of quotes.
1045 *
1046 * This function changes the character sequence \" to just ". It leaves all
1047 * other slashes alone. It's really weird, but the quoting from
1048 * preg_replace(//e) seems to require this.
1049 *
1050 * @since 1.0.0
1051 *
1052 * @param string $string String to strip slashes
1053 * @return string Fixed string with quoted slashes
1054 */
1055function wp_kses_stripslashes($string) {
1056	return preg_replace('%\\\\"%', '"', $string);
1057}
1058
1059/**
1060 * Goes through an array and changes the keys to all lower case.
1061 *
1062 * @since 1.0.0
1063 *
1064 * @param array $inarray Unfiltered array
1065 * @return array Fixed array with all lowercase keys
1066 */
1067function wp_kses_array_lc($inarray) {
1068	$outarray = array ();
1069
1070	foreach ( (array) $inarray as $inkey => $inval) {
1071		$outkey = strtolower($inkey);
1072		$outarray[$outkey] = array ();
1073
1074		foreach ( (array) $inval as $inkey2 => $inval2) {
1075			$outkey2 = strtolower($inkey2);
1076			$outarray[$outkey][$outkey2] = $inval2;
1077		} # foreach $inval
1078	} # foreach $inarray
1079
1080	return $outarray;
1081}
1082
1083/**
1084 * Removes the HTML JavaScript entities found in early versions of Netscape 4.
1085 *
1086 * @since 1.0.0
1087 *
1088 * @param string $string
1089 * @return string
1090 */
1091function wp_kses_js_entities($string) {
1092	return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
1093}
1094
1095/**
1096 * Handles parsing errors in wp_kses_hair().
1097 *
1098 * The general plan is to remove everything to and including some whitespace,
1099 * but it deals with quotes and apostrophes as well.
1100 *
1101 * @since 1.0.0
1102 *
1103 * @param string $string
1104 * @return string
1105 */
1106function wp_kses_html_error($string) {
1107	return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);
1108}
1109
1110/**
1111 * Sanitizes content from bad protocols and other characters.
1112 *
1113 * This function searches for URL protocols at the beginning of $string, while
1114 * handling whitespace and HTML entities.
1115 *
1116 * @since 1.0.0
1117 *
1118 * @param string $string Content to check for bad protocols
1119 * @param string $allowed_protocols Allowed protocols
1120 * @return string Sanitized content
1121 */
1122function wp_kses_bad_protocol_once($string, $allowed_protocols, $count = 1 ) {
1123	$string2 = preg_split( '/:|&#0*58;|&#x0*3a;/i', $string, 2 );
1124	if ( isset($string2[1]) && ! preg_match('%/\?%', $string2[0]) ) {
1125		$string = trim( $string2[1] );
1126		$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );
1127		if ( 'feed:' == $protocol ) {
1128			if ( $count > 2 )
1129				return '';
1130			$string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count );
1131			if ( empty( $string ) )
1132				return $string;
1133		}
1134		$string = $protocol . $string;
1135	}
1136
1137	return $string;
1138}
1139
1140/**
1141 * Callback for wp_kses_bad_protocol_once() regular expression.
1142 *
1143 * This function processes URL protocols, checks to see if they're in the
1144 * whitelist or not, and returns different data depending on the answer.
1145 *
1146 * @access private
1147 * @since 1.0.0
1148 *
1149 * @param string $string URI scheme to check against the whitelist
1150 * @param string $allowed_protocols Allowed protocols
1151 * @return string Sanitized content
1152 */
1153function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) {
1154	$string2 = wp_kses_decode_entities($string);
1155	$string2 = preg_replace('/\s/', '', $string2);
1156	$string2 = wp_kses_no_null($string2);
1157	$string2 = strtolower($string2);
1158
1159	$allowed = false;
1160	foreach ( (array) $allowed_protocols as $one_protocol )
1161		if ( strtolower($one_protocol) == $string2 ) {
1162			$allowed = true;
1163			break;
1164		}
1165
1166	if ($allowed)
1167		return "$string2:";
1168	else
1169		return '';
1170}
1171
1172/**
1173 * Converts and fixes HTML entities.
1174 *
1175 * This function normalizes HTML entities. It will convert `AT&T` to the correct
1176 * `AT&amp;T`, `&#00058;` to `&#58;`, `&#XYZZY;` to `&amp;#XYZZY;` and so on.
1177 *
1178 * @since 1.0.0
1179 *
1180 * @param string $string Content to normalize entities
1181 * @return string Content with normalized entities
1182 */
1183function wp_kses_normalize_entities($string) {
1184	# Disarm all entities by converting & to &amp;
1185
1186	$string = str_replace('&', '&amp;', $string);
1187
1188	# Change back the allowed entities in our entity whitelist
1189
1190	$string = preg_replace_callback('/&amp;([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string);
1191	$string = preg_replace_callback('/&amp;#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string);
1192	$string = preg_replace_callback('/&amp;#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string);
1193
1194	return $string;
1195}
1196
1197/**
1198 * Callback for wp_kses_normalize_entities() regular expression.
1199 *
1200 * This function only accepts valid named entity references, which are finite,
1201 * case-sensitive, and highly scrutinized by HTML and XML validators.
1202 *
1203 * @since 3.0.0
1204 *
1205 * @param array $matches preg_replace_callback() matches array
1206 * @return string Correctly encoded entity
1207 */
1208function wp_kses_named_entities($matches) {
1209	global $allowedentitynames;
1210
1211	if ( empty($matches[1]) )
1212		return '';
1213
1214	$i = $matches[1];
1215	return ( ( ! in_array($i, $allowedentitynames) ) ? "&amp;$i;" : "&$i;" );
1216}
1217
1218/**
1219 * Callback for wp_kses_normalize_entities() regular expression.
1220 *
1221 * This function helps {@see wp_kses_normalize_entities()} to only accept 16-bit
1222 * values and nothing more for `&#number;` entities.
1223 *
1224 * @access private
1225 * @since 1.0.0
1226 *
1227 * @param array $matches preg_replace_callback() matches array
1228 * @return string Correctly encoded entity
1229 */
1230function wp_kses_normalize_entities2($matches) {
1231	if ( empty($matches[1]) )
1232		return '';
1233
1234	$i = $matches[1];
1235	if (valid_unicode($i)) {
1236		$i = str_pad(ltrim($i,'0'), 3, '0', STR_PAD_LEFT);
1237		$i = "&#$i;";
1238	} else {
1239		$i = "&amp;#$i;";
1240	}
1241
1242	return $i;
1243}
1244
1245/**
1246 * Callback for wp_kses_normalize_entities() for regular expression.
1247 *
1248 * This function helps wp_kses_normalize_entities() to only accept valid Unicode
1249 * numeric entities in hex form.
1250 *
1251 * @access private
1252 *
1253 * @param array $matches preg_replace_callback() matches array
1254 * @return string Correctly encoded entity
1255 */
1256function wp_kses_normalize_entities3($matches) {
1257	if ( empty($matches[1]) )
1258		return '';
1259
1260	$hexchars = $matches[1];
1261	return ( ( ! valid_unicode(hexdec($hexchars)) ) ? "&amp;#x$hexchars;" : '&#x'.ltrim($hexchars,'0').';' );
1262}
1263
1264/**
1265 * Helper function to determine if a Unicode value is valid.
1266 *
1267 * @param int $i Unicode value
1268 * @return bool True if the value was a valid Unicode number
1269 */
1270function valid_unicode($i) {
1271	return ( $i == 0x9 || $i == 0xa || $i == 0xd ||
1272			($i >= 0x20 && $i <= 0xd7ff) ||
1273			($i >= 0xe000 && $i <= 0xfffd) ||
1274			($i >= 0x10000 && $i <= 0x10ffff) );
1275}
1276
1277/**
1278 * Convert all entities to their character counterparts.
1279 *
1280 * This function decodes numeric HTML entities (`&#65;` and `&#x41;`).
1281 * It doesn't do anything with other entities like &auml;, but we don't
1282 * need them in the URL protocol whitelisting system anyway.
1283 *
1284 * @since 1.0.0
1285 *
1286 * @param string $string Content to change entities
1287 * @return string Content after decoded entities
1288 */
1289function wp_kses_decode_entities($string) {
1290	$string = preg_replace_callback('/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string);
1291	$string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string);
1292
1293	return $string;
1294}
1295
1296/**
1297 * Regex callback for wp_kses_decode_entities()
1298 *
1299 * @param array $match preg match
1300 * @return string
1301 */
1302function _wp_kses_decode_entities_chr( $match ) {
1303	return chr( $match[1] );
1304}
1305
1306/**
1307 * Regex callback for wp_kses_decode_entities()
1308 *
1309 * @param array $match preg match
1310 * @return string
1311 */
1312function _wp_kses_decode_entities_chr_hexdec( $match ) {
1313	return chr( hexdec( $match[1] ) );
1314}
1315
1316/**
1317 * Sanitize content with allowed HTML Kses rules.
1318 *
1319 * @since 1.0.0
1320 *
1321 * @param string $data Content to filter, expected to be escaped with slashes
1322 * @return string Filtered content
1323 */
1324function wp_filter_kses( $data ) {
1325	return addslashes( wp_kses( stripslashes( $data ), current_filter() ) );
1326}
1327
1328/**
1329 * Sanitize content with allowed HTML Kses rules.
1330 *
1331 * @since 2.9.0
1332 *
1333 * @param string $data Content to filter, expected to not be escaped
1334 * @return string Filtered content
1335 */
1336function wp_kses_data( $data ) {
1337	return wp_kses( $data , current_filter() );
1338}
1339
1340/**
1341 * Sanitize content for allowed HTML tags for post content.
1342 *
1343 * Post content refers to the page contents of the 'post' type and not $_POST
1344 * data from forms.
1345 *
1346 * @since 2.0.0
1347 *
1348 * @param string $data Post content to filter, expected to be escaped with slashes
1349 * @return string Filtered post content with allowed HTML tags and attributes intact.
1350 */
1351function wp_filter_post_kses($data) {
1352	return addslashes ( wp_kses( stripslashes( $data ), 'post' ) );
1353}
1354
1355/**
1356 * Sanitize content for allowed HTML tags for post content.
1357 *
1358 * Post content refers to the page contents of the 'post' type and not $_POST
1359 * data from forms.
1360 *
1361 * @since 2.9.0
1362 *
1363 * @param string $data Post content to filter
1364 * @return string Filtered post content with allowed HTML tags and attributes intact.
1365 */
1366function wp_kses_post($data) {
1367	return wp_kses( $data , 'post' );
1368}
1369
1370/**
1371 * Strips all of the HTML in the content.
1372 *
1373 * @since 2.1.0
1374 *
1375 * @param string $data Content to strip all HTML from
1376 * @return string Filtered content without any HTML
1377 */
1378function wp_filter_nohtml_kses( $data ) {
1379	return addslashes ( wp_kses( stripslashes( $data ), 'strip' ) );
1380}
1381
1382/**
1383 * Adds all Kses input form content filters.
1384 *
1385 * All hooks have default priority. The wp_filter_kses() function is added to
1386 * the 'pre_comment_content' and 'title_save_pre' hooks.
1387 *
1388 * The wp_filter_post_kses() function is added to the 'content_save_pre',
1389 * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks.
1390 *
1391 * @since 2.0.0
1392 */
1393function kses_init_filters() {
1394	// Normal filtering
1395	add_filter('title_save_pre', 'wp_filter_kses');
1396
1397	// Comment filtering
1398	if ( current_user_can( 'unfiltered_html' ) )
1399		add_filter( 'pre_comment_content', 'wp_filter_post_kses' );
1400	else
1401		add_filter( 'pre_comment_content', 'wp_filter_kses' );
1402
1403	// Post filtering
1404	add_filter('content_save_pre', 'wp_filter_post_kses');
1405	add_filter('excerpt_save_pre', 'wp_filter_post_kses');
1406	add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
1407}
1408
1409/**
1410 * Removes all Kses input form content filters.
1411 *
1412 * A quick procedural method to removing all of the filters that kses uses for
1413 * content in WordPress Loop.
1414 *
1415 * Does not remove the kses_init() function from 'init' hook (priority is
1416 * default). Also does not remove kses_init() function from 'set_current_user'
1417 * hook (priority is also default).
1418 *
1419 * @since 2.0.6
1420 */
1421function kses_remove_filters() {
1422	// Normal filtering
1423	remove_filter('title_save_pre', 'wp_filter_kses');
1424
1425	// Comment filtering
1426	remove_filter( 'pre_comment_content', 'wp_filter_post_kses' );
1427	remove_filter( 'pre_comment_content', 'wp_filter_kses' );
1428
1429	// Post filtering
1430	remove_filter('content_save_pre', 'wp_filter_post_kses');
1431	remove_filter('excerpt_save_pre', 'wp_filter_post_kses');
1432	remove_filter('content_filtered_save_pre', 'wp_filter_post_kses');
1433}
1434
1435/**
1436 * Sets up most of the Kses filters for input form content.
1437 *
1438 * If you remove the kses_init() function from 'init' hook and
1439 * 'set_current_user' (priority is default), then none of the Kses filter hooks
1440 * will be added.
1441 *
1442 * First removes all of the Kses filters in case the current user does not need
1443 * to have Kses filter the content. If the user does not have unfiltered_html
1444 * capability, then Kses filters are added.
1445 *
1446 * @since 2.0.0
1447 */
1448function kses_init() {
1449	kses_remove_filters();
1450
1451	if (current_user_can('unfiltered_html') == false)
1452		kses_init_filters();
1453}
1454
1455add_action('init', 'kses_init');
1456add_action('set_current_user', 'kses_init');
1457
1458/**
1459 * Inline CSS filter
1460 *
1461 * @since 2.8.1
1462 */
1463function safecss_filter_attr( $css, $deprecated = '' ) {
1464	if ( !empty( $deprecated ) )
1465		_deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented
1466
1467	$css = wp_kses_no_null($css);
1468	$css = str_replace(array("\n","\r","\t"), '', $css);
1469
1470	if ( preg_match( '%[\\\\(&=}]|/\*%', $css ) ) // remove any inline css containing \ ( & } = or comments
1471		return '';
1472
1473	$css_array = explode( ';', trim( $css ) );
1474
1475	/**
1476	 * Filter list of allowed CSS attributes.
1477	 *
1478	 * @since 2.8.1
1479	 *
1480	 * @param array $attr List of allowed CSS attributes.
1481	 */
1482	$allowed_attr = apply_filters( 'safe_style_css', array( 'text-align', 'margin', 'color', 'float',
1483	'border', 'background', 'background-color', 'border-bottom', 'border-bottom-color',
1484	'border-bottom-style', 'border-bottom-width', 'border-collapse', 'border-color', 'border-left',
1485	'border-left-color', 'border-left-style', 'border-left-width', 'border-right', 'border-right-color',
1486	'border-right-style', 'border-right-width', 'border-spacing', 'border-style', 'border-top',
1487	'border-top-color', 'border-top-style', 'border-top-width', 'border-width', 'caption-side',
1488	'clear', 'cursor', 'direction', 'font', 'font-family', 'font-size', 'font-style',
1489	'font-variant', 'font-weight', 'height', 'letter-spacing', 'line-height', 'margin-bottom',
1490	'margin-left', 'margin-right', 'margin-top', 'overflow', 'padding', 'padding-bottom',
1491	'padding-left', 'padding-right', 'padding-top', 'text-decoration', 'text-indent', 'vertical-align',
1492	'width' ) );
1493
1494	if ( empty($allowed_attr) )
1495		return $css;
1496
1497	$css = '';
1498	foreach ( $css_array as $css_item ) {
1499		if ( $css_item == '' )
1500			continue;
1501		$css_item = trim( $css_item );
1502		$found = false;
1503		if ( strpos( $css_item, ':' ) === false ) {
1504			$found = true;
1505		} else {
1506			$parts = explode( ':', $css_item );
1507			if ( in_array( trim( $parts[0] ), $allowed_attr ) )
1508				$found = true;
1509		}
1510		if ( $found ) {
1511			if( $css != '' )
1512				$css .= ';';
1513			$css .= $css_item;
1514		}
1515	}
1516
1517	return $css;
1518}
1519
1520/**
1521 * Helper function to add global attributes to a tag in the allowed html list.
1522 *
1523 * @since 3.5.0
1524 * @access private
1525 *
1526 * @param array $value An array of attributes.
1527 * @return array The array of attributes with global attributes added.
1528 */
1529function _wp_add_global_attributes( $value ) {
1530	$global_attributes = array(
1531		'class' => true,
1532		'id' => true,
1533		'style' => true,
1534		'title' => true,
1535		'role' => true,
1536	);
1537
1538	if ( true === $value )
1539		$value = array();
1540
1541	if ( is_array( $value ) )
1542		return array_merge( $value, $global_attributes );
1543
1544	return $value;
1545}