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* Removing hardcoded styles from msg:searchdisabled and msg:googlesearch
[mediawiki.git] / includes / Sanitizer.php
blobe6c56e98b4710b3faf0b5a8d6a976e4337f0f447
1 <?php
2
3 /**
4 * (X)HTML sanitizer for MediaWiki
5 *
6 * Copyright (C) 2002-2005 Brion Vibber <brion@pobox.com> et al
7 * http://www.mediawiki.org/
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 * http://www.gnu.org/copyleft/gpl.html
23 *
24 * @package MediaWiki
25 * @subpackage Parser
26 */
27
28 class Sanitizer {
29 /**
30 * Cleans up HTML, removes dangerous tags and attributes, and
31 * removes HTML comments
32 * @access private
33 * @param string $text
34 * @return string
35 */
36 function removeHTMLtags( $text ) {
37 global $wgUseTidy, $wgUserHtml;
38 $fname = 'Parser::removeHTMLtags';
39 wfProfileIn( $fname );
40
41 if( $wgUserHtml ) {
42 $htmlpairs = array( # Tags that must be closed
43 'b', 'del', 'i', 'ins', 'u', 'font', 'big', 'small', 'sub', 'sup', 'h1',
44 'h2', 'h3', 'h4', 'h5', 'h6', 'cite', 'code', 'em', 's',
45 'strike', 'strong', 'tt', 'var', 'div', 'center',
46 'blockquote', 'ol', 'ul', 'dl', 'table', 'caption', 'pre',
47 'ruby', 'rt' , 'rb' , 'rp', 'p', 'span'
48 );
49 $htmlsingle = array(
50 'br', 'hr', 'li', 'dt', 'dd'
51 );
52 $htmlnest = array( # Tags that can be nested--??
53 'table', 'tr', 'td', 'th', 'div', 'blockquote', 'ol', 'ul',
54 'dl', 'font', 'big', 'small', 'sub', 'sup', 'span'
55 );
56 $tabletags = array( # Can only appear inside table
57 'td', 'th', 'tr'
58 );
59 } else {
60 $htmlpairs = array();
61 $htmlsingle = array();
62 $htmlnest = array();
63 $tabletags = array();
64 }
65
66 $htmlsingle = array_merge( $tabletags, $htmlsingle );
67 $htmlelements = array_merge( $htmlsingle, $htmlpairs );
68
69 # Remove HTML comments
70 $text = Sanitizer::removeHTMLcomments( $text );
71
72 $bits = explode( '<', $text );
73 $text = array_shift( $bits );
74 if(!$wgUseTidy) {
75 $tagstack = array(); $tablestack = array();
76 foreach ( $bits as $x ) {
77 $prev = error_reporting( E_ALL & ~( E_NOTICE | E_WARNING ) );
78 preg_match( '/^(\\/?)(\\w+)([^>]*)(\\/{0,1}>)([^<]*)$/',
79 $x, $regs );
80 list( $qbar, $slash, $t, $params, $brace, $rest ) = $regs;
81 error_reporting( $prev );
82
83 $badtag = 0 ;
84 if ( in_array( $t = strtolower( $t ), $htmlelements ) ) {
85 # Check our stack
86 if ( $slash ) {
87 # Closing a tag...
88 if ( ! in_array( $t, $htmlsingle ) &&
89 ( $ot = @array_pop( $tagstack ) ) != $t ) {
90 @array_push( $tagstack, $ot );
91 $badtag = 1;
92 } else {
93 if ( $t == 'table' ) {
94 $tagstack = array_pop( $tablestack );
95 }
96 $newparams = '';
97 }
98 } else {
99 # Keep track for later
100 if ( in_array( $t, $tabletags ) &&
101 ! in_array( 'table', $tagstack ) ) {
102 $badtag = 1;
103 } else if ( in_array( $t, $tagstack ) &&
104 ! in_array ( $t , $htmlnest ) ) {
105 $badtag = 1 ;
106 } else if ( ! in_array( $t, $htmlsingle ) ) {
107 if ( $t == 'table' ) {
108 array_push( $tablestack, $tagstack );
109 $tagstack = array();
110 }
111 array_push( $tagstack, $t );
112 }
113 # Strip non-approved attributes from the tag
114 $newparams = Sanitizer::fixTagAttributes( $params, $t );
115 }
116 if ( ! $badtag ) {
117 $rest = str_replace( '>', '&gt;', $rest );
118 $text .= "<$slash$t$newparams$brace$rest";
119 continue;
120 }
121 }
122 $text .= '&lt;' . str_replace( '>', '&gt;', $x);
123 }
124 # Close off any remaining tags
125 while ( is_array( $tagstack ) && ($t = array_pop( $tagstack )) ) {
126 $text .= "</$t>\n";
127 if ( $t == 'table' ) { $tagstack = array_pop( $tablestack ); }
128 }
129 } else {
130 # this might be possible using tidy itself
131 foreach ( $bits as $x ) {
132 preg_match( '/^(\\/?)(\\w+)([^>]*)(\\/{0,1}>)([^<]*)$/',
133 $x, $regs );
134 @list( $qbar, $slash, $t, $params, $brace, $rest ) = $regs;
135 if ( in_array( $t = strtolower( $t ), $htmlelements ) ) {
136 $newparams = Sanitizer::fixTagAttributes( $params, $t );
137 $rest = str_replace( '>', '&gt;', $rest );
138 $text .= "<$slash$t$newparams$brace$rest";
139 } else {
140 $text .= '&lt;' . str_replace( '>', '&gt;', $x);
141 }
142 }
143 }
144 wfProfileOut( $fname );
145 return $text;
146 }
147
148 /**
149 * Remove '<!--', '-->', and everything between.
150 * To avoid leaving blank lines, when a comment is both preceded
151 * and followed by a newline (ignoring spaces), trim leading and
152 * trailing spaces and one of the newlines.
153 *
154 * @access private
155 * @param string $text
156 * @return string
157 */
158 function removeHTMLcomments( $text ) {
159 $fname='Parser::removeHTMLcomments';
160 wfProfileIn( $fname );
161 while (($start = strpos($text, '<!--')) !== false) {
162 $end = strpos($text, '-->', $start + 4);
163 if ($end === false) {
164 # Unterminated comment; bail out
165 break;
166 }
167
168 $end += 3;
169
170 # Trim space and newline if the comment is both
171 # preceded and followed by a newline
172 $spaceStart = max($start - 1, 0);
173 $spaceLen = $end - $spaceStart;
174 while (substr($text, $spaceStart, 1) === ' ' && $spaceStart > 0) {
175 $spaceStart--;
176 $spaceLen++;
177 }
178 while (substr($text, $spaceStart + $spaceLen, 1) === ' ')
179 $spaceLen++;
180 if (substr($text, $spaceStart, 1) === "\n" and substr($text, $spaceStart + $spaceLen, 1) === "\n") {
181 # Remove the comment, leading and trailing
182 # spaces, and leave only one newline.
183 $text = substr_replace($text, "\n", $spaceStart, $spaceLen + 1);
184 }
185 else {
186 # Remove just the comment.
187 $text = substr_replace($text, '', $start, $end - $start);
188 }
189 }
190 wfProfileOut( $fname );
191 return $text;
192 }
193
194 /**
195 * Take a tag soup fragment listing an HTML element's attributes
196 * and normalize it to well-formed XML, discarding unwanted attributes.
197 *
198 * - Normalizes attribute names to lowercase
199 * - Discards attributes not on a whitelist for the given element
200 * - Turns broken or invalid entities into plaintext
201 * - Double-quotes all attribute values
202 * - Attributes without values are given the name as attribute
203 * - Double attributes are discarded
204 * - Unsafe style attributes are discarded
205 * - Prepends space if there are attributes.
206 *
207 * @param string $text
208 * @param string $element
209 * @return string
210 *
211 * @todo Check for legal values where the DTD limits things.
212 * @todo Check for unique id attribute :P
213 */
214 function fixTagAttributes( $text, $element ) {
215 if( trim( $text ) == '' ) {
216 return '';
217 }
218
219 $attrib = '[A-Za-z0-9]'; #FIXME
220 $space = '[\x09\x0a\x0d\x20]';
221 if( !preg_match_all(
222 "/(?:^|$space)($attrib+)
223 ($space*=$space*
224 (?:
225 # The attribute value: quoted or alone
226 \"([^<\"]*)\"
227 | '([^<']*)'
228 | ([a-zA-Z0-9._:-]+)
229 | (\#[0-9a-fA-F]+) # Technically wrong, but lots of
230 # colors are specified like this.
231 # We'll be normalizing it.
232 )
233 )?(?=$space|\$)/sx",
234 $text,
235 $pairs,
236 PREG_SET_ORDER ) ) {
237 return '';
238 }
239
240 $whitelist = array_flip( Sanitizer::attributeWhitelist( $element ) );
241 $attribs = array();
242 foreach( $pairs as $set ) {
243 $attribute = strtolower( $set[1] );
244 if( !isset( $whitelist[$attribute] ) ) {
245 continue;
246 }
247 if( !isset( $set[2] ) ) {
248 # In XHTML, attributes must have a value.
249 $value = $set[1];
250 } elseif( $set[3] != '' ) {
251 # Double-quoted
252 $value = Sanitizer::normalizeAttributeValue( $set[3] );
253 } elseif( $set[4] != '' ) {
254 # Single-quoted
255 $value = str_replace( '"', '&quot;',
256 Sanitizer::normalizeAttributeValue( $set[4] ) );
257 } elseif( $set[5] != '' ) {
258 # No quotes.
259 $value = Sanitizer::normalizeAttributeValue( $set[5] );
260 } elseif( $set[6] != '' ) {
261 # Illegal #XXXXXX color with no quotes.
262 $value = Sanitizer::normalizeAttributeValue( $set[6] );
263 } else {
264 wfDebugDieBacktrace( "Tag conditions not met. Something's very odd." );
265 }
266
267 # Strip javascript "expression" from stylesheets.
268 # http://msdn.microsoft.com/workshop/author/dhtml/overview/recalc.asp
269 if( $attribute == 'style' && preg_match(
270 '/(expression|tps*:\/\/|url\\s*\().*/is',
271 wfMungeToUtf8( $value ) ) ) {
272 # haxx0r
273 continue;
274 }
275
276 if( !isset( $attribs[$attribute] ) ) {
277 $attribs[$attribute] = "$attribute=\"$value\"";
278 }
279 }
280 if( empty( $attribs ) ) {
281 return '';
282 } else {
283 return ' ' . implode( ' ', $attribs );
284 }
285 }
286
287 /**
288 * Normalize whitespace and character references in an XML source-
289 * encoded text for an attribute value.
290 *
291 * See http://www.w3.org/TR/REC-xml/#AVNormalize for background,
292 * but note that we're not returning the value, but are returning
293 * XML source fragments that will be slapped into output.
294 *
295 * @param string $text
296 * @return string
297 * @access private
298 */
299 function normalizeAttributeValue( $text ) {
300 return preg_replace(
301 '/\r\n|[\x20\x0d\x0a\x09]/',
302 ' ',
303 Sanitizer::normalizeCharReferences( $text ) );
304 }
305
306 /**
307 * Ensure that any entities and character references are legal
308 * for XML and XHTML specifically. Any stray bits will be
309 * &amp;-escaped to result in a valid text fragment.
310 *
311 * a. any named char refs must be known in XHTML
312 * b. any numeric char refs must be legal chars, not invalid or forbidden
313 * c. use &#x, not &#X
314 * d. fix or reject non-valid attributes
315 *
316 * @param string $text
317 * @return string
318 * @access private
319 */
320 function normalizeCharReferences( $text ) {
321 return preg_replace_callback(
322 '/&([A-Za-z0-9]+);
323 |&\#([0-9]+);
324 |&\#x([0-9A-Za-z]+);
325 |&\#X([0-9A-Za-z]+);
326 |(&)/x',
327 array( 'Sanitizer', 'normalizeCharReferencesCallback' ),
328 $text );
329 }
330 /**
331 * @param string $matches
332 * @return string
333 */
334 function normalizeCharReferencesCallback( $matches ) {
335 $ret = null;
336 if( $matches[1] != '' ) {
337 $ret = Sanitizer::normalizeEntity( $matches[1] );
338 } elseif( $matches[2] != '' ) {
339 $ret = Sanitizer::decCharReference( $matches[2] );
340 } elseif( $matches[3] != '' ) {
341 $ret = Sanitizer::hexCharReference( $matches[3] );
342 } elseif( $matches[4] != '' ) {
343 $ret = Sanitizer::hexCharReference( $matches[4] );
344 }
345 if( is_null( $ret ) ) {
346 return htmlspecialchars( $matches[0] );
347 } else {
348 return $ret;
349 }
350 }
351
352 /**
353 * If the named entity is defined in the HTML 4.0/XHTML 1.0 DTD,
354 * return the named entity reference as is. Otherwise, returns
355 * HTML-escaped text of pseudo-entity source (eg &amp;foo;)
356 *
357 * @param string $name
358 * @return string
359 */
360 function normalizeEntity( $name ) {
361 # List of all named character entities defined in HTML 4.01
362 # http://www.w3.org/TR/html4/sgml/entities.html
363 static $htmlEntities = array(
364 'aacute' => true,
365 'Aacute' => true,
366 'acirc' => true,
367 'Acirc' => true,
368 'acute' => true,
369 'aelig' => true,
370 'AElig' => true,
371 'agrave' => true,
372 'Agrave' => true,
373 'alefsym' => true,
374 'alpha' => true,
375 'Alpha' => true,
376 'amp' => true,
377 'and' => true,
378 'ang' => true,
379 'apos' => true,
380 'aring' => true,
381 'Aring' => true,
382 'asymp' => true,
383 'atilde' => true,
384 'Atilde' => true,
385 'auml' => true,
386 'Auml' => true,
387 'bdquo' => true,
388 'beta' => true,
389 'Beta' => true,
390 'brvbar' => true,
391 'bull' => true,
392 'cap' => true,
393 'ccedil' => true,
394 'Ccedil' => true,
395 'cedil' => true,
396 'cent' => true,
397 'chi' => true,
398 'Chi' => true,
399 'circ' => true,
400 'clubs' => true,
401 'cong' => true,
402 'copy' => true,
403 'crarr' => true,
404 'cup' => true,
405 'curren' => true,
406 'dagger' => true,
407 'Dagger' => true,
408 'darr' => true,
409 'dArr' => true,
410 'deg' => true,
411 'delta' => true,
412 'Delta' => true,
413 'diams' => true,
414 'divide' => true,
415 'eacute' => true,
416 'Eacute' => true,
417 'ecirc' => true,
418 'Ecirc' => true,
419 'egrave' => true,
420 'Egrave' => true,
421 'empty' => true,
422 'emsp' => true,
423 'ensp' => true,
424 'epsilon' => true,
425 'Epsilon' => true,
426 'equiv' => true,
427 'eta' => true,
428 'Eta' => true,
429 'eth' => true,
430 'ETH' => true,
431 'euml' => true,
432 'Euml' => true,
433 'euro' => true,
434 'exist' => true,
435 'fnof' => true,
436 'forall' => true,
437 'frac12' => true,
438 'frac14' => true,
439 'frac34' => true,
440 'frasl' => true,
441 'gamma' => true,
442 'Gamma' => true,
443 'ge' => true,
444 'gt' => true,
445 'harr' => true,
446 'hArr' => true,
447 'hearts' => true,
448 'hellip' => true,
449 'iacute' => true,
450 'Iacute' => true,
451 'icirc' => true,
452 'Icirc' => true,
453 'iexcl' => true,
454 'igrave' => true,
455 'Igrave' => true,
456 'image' => true,
457 'infin' => true,
458 'int' => true,
459 'iota' => true,
460 'Iota' => true,
461 'iquest' => true,
462 'isin' => true,
463 'iuml' => true,
464 'Iuml' => true,
465 'kappa' => true,
466 'Kappa' => true,
467 'lambda' => true,
468 'Lambda' => true,
469 'lang' => true,
470 'laquo' => true,
471 'larr' => true,
472 'lArr' => true,
473 'lceil' => true,
474 'ldquo' => true,
475 'le' => true,
476 'lfloor' => true,
477 'lowast' => true,
478 'loz' => true,
479 'lrm' => true,
480 'lsaquo' => true,
481 'lsquo' => true,
482 'lt' => true,
483 'macr' => true,
484 'mdash' => true,
485 'micro' => true,
486 'middot' => true,
487 'minus' => true,
488 'mu' => true,
489 'Mu' => true,
490 'nabla' => true,
491 'nbsp' => true,
492 'ndash' => true,
493 'ne' => true,
494 'ni' => true,
495 'not' => true,
496 'notin' => true,
497 'nsub' => true,
498 'ntilde' => true,
499 'Ntilde' => true,
500 'nu' => true,
501 'Nu' => true,
502 'oacute' => true,
503 'Oacute' => true,
504 'ocirc' => true,
505 'Ocirc' => true,
506 'oelig' => true,
507 'OElig' => true,
508 'ograve' => true,
509 'Ograve' => true,
510 'oline' => true,
511 'omega' => true,
512 'Omega' => true,
513 'omicron' => true,
514 'Omicron' => true,
515 'oplus' => true,
516 'or' => true,
517 'ordf' => true,
518 'ordm' => true,
519 'oslash' => true,
520 'Oslash' => true,
521 'otilde' => true,
522 'Otilde' => true,
523 'otimes' => true,
524 'ouml' => true,
525 'Ouml' => true,
526 'para' => true,
527 'part' => true,
528 'permil' => true,
529 'perp' => true,
530 'phi' => true,
531 'Phi' => true,
532 'pi' => true,
533 'Pi' => true,
534 'piv' => true,
535 'plusmn' => true,
536 'pound' => true,
537 'prime' => true,
538 'Prime' => true,
539 'prod' => true,
540 'prop' => true,
541 'psi' => true,
542 'Psi' => true,
543 'quot' => true,
544 'radic' => true,
545 'rang' => true,
546 'raquo' => true,
547 'rarr' => true,
548 'rArr' => true,
549 'rceil' => true,
550 'rdquo' => true,
551 'real' => true,
552 'reg' => true,
553 'rfloor' => true,
554 'rho' => true,
555 'Rho' => true,
556 'rlm' => true,
557 'rsaquo' => true,
558 'rsquo' => true,
559 'sbquo' => true,
560 'scaron' => true,
561 'Scaron' => true,
562 'sdot' => true,
563 'sect' => true,
564 'shy' => true,
565 'sigma' => true,
566 'Sigma' => true,
567 'sigmaf' => true,
568 'sim' => true,
569 'spades' => true,
570 'sub' => true,
571 'sube' => true,
572 'sum' => true,
573 'sup' => true,
574 'sup1' => true,
575 'sup2' => true,
576 'sup3' => true,
577 'supe' => true,
578 'szlig' => true,
579 'tau' => true,
580 'Tau' => true,
581 'there4' => true,
582 'theta' => true,
583 'Theta' => true,
584 'thetasym' => true,
585 'thinsp' => true,
586 'thorn' => true,
587 'THORN' => true,
588 'tilde' => true,
589 'times' => true,
590 'trade' => true,
591 'uacute' => true,
592 'Uacute' => true,
593 'uarr' => true,
594 'uArr' => true,
595 'ucirc' => true,
596 'Ucirc' => true,
597 'ugrave' => true,
598 'Ugrave' => true,
599 'uml' => true,
600 'upsih' => true,
601 'upsilon' => true,
602 'Upsilon' => true,
603 'uuml' => true,
604 'Uuml' => true,
605 'weierp' => true,
606 'xi' => true,
607 'Xi' => true,
608 'yacute' => true,
609 'Yacute' => true,
610 'yen' => true,
611 'yuml' => true,
612 'Yuml' => true,
613 'zeta' => true,
614 'Zeta' => true,
615 'zwj' => true,
616 'zwnj' => true );
617 if( isset( $htmlEntities[$name] ) ) {
618 return "&$name;";
619 } else {
620 return "&amp;$name;";
621 }
622 }
623
624 function decCharReference( $codepoint ) {
625 $point = IntVal( $codepoint );
626 if( Sanitizer::validateCodepoint( $point ) ) {
627 return sprintf( '&#%d;', $point );
628 } else {
629 return null;
630 }
631 }
632
633 function hexCharReference( $codepoint ) {
634 $point = hexdec( $codepoint );
635 if( Sanitizer::validateCodepoint( $point ) ) {
636 return sprintf( '&#x%x;', $point );
637 } else {
638 return null;
639 }
640 }
641
642 /**
643 * Returns true if a given Unicode codepoint is a valid character in XML.
644 * @param int $codepoint
645 * @return bool
646 */
647 function validateCodepoint( $codepoint ) {
648 return ($codepoint == 0x09)
649 || ($codepoint == 0x0a)
650 || ($codepoint == 0x0d)
651 || ($codepoint >= 0x20 && $codepoint <= 0xd7ff)
652 || ($codepoint >= 0xe000 && $codepoint <= 0xfffd)
653 || ($codepoint >= 0x10000 && $codepoint <= 0x10ffff);
654 }
655
656 /**
657 * Fetch the whitelist of acceptable attributes for a given
658 * element name.
659 *
660 * @param string $element
661 * @return array
662 */
663 function attributeWhitelist( $element ) {
664 $list = Sanitizer::setupAttributeWhitelist();
665 return isset( $list[$element] )
666 ? $list[$element]
667 : array();
668 }
669
670 /**
671 * @return array
672 */
673 function setupAttributeWhitelist() {
674 $common = array( 'id', 'class', 'lang', 'dir', 'title', 'style' );
675 $block = array_merge( $common, array( 'align' ) );
676 $tablealign = array( 'align', 'char', 'charoff', 'valign' );
677 $tablecell = array( 'abbr',
678 'axis',
679 'headers',
680 'scope',
681 'rowspan',
682 'colspan',
683 'nowrap', # deprecated
684 'width', # deprecated
685 'height' # deprecated
686 );
687
688 # Numbers refer to sections in HTML 4.01 standard describing the element.
689 # See: http://www.w3.org/TR/html4/
690 $whitelist = array (
691 # 7.5.4
692 'div' => $block,
693 'center' => $common, # deprecated
694 'span' => $block, # ??
695
696 # 7.5.5
697 'h1' => $block,
698 'h2' => $block,
699 'h3' => $block,
700 'h4' => $block,
701 'h5' => $block,
702 'h6' => $block,
703
704 # 7.5.6
705 # address
706
707 # 8.2.4
708 # bdo
709
710 # 9.2.1
711 'em' => $common,
712 'strong' => $common,
713 'cite' => $common,
714 # dfn
715 'code' => $common,
716 # samp
717 # kbd
718 'var' => $common,
719 # abbr
720 # acronym
721
722 # 9.2.2
723 'blockquote' => array_merge( $common, array( 'cite' ) ),
724 # q
725
726 # 9.2.3
727 'sub' => $common,
728 'sup' => $common,
729
730 # 9.3.1
731 'p' => $block,
732
733 # 9.3.2
734 'br' => array( 'id', 'class', 'title', 'style', 'clear' ),
735
736 # 9.3.4
737 'pre' => array_merge( $common, array( 'width' ) ),
738
739 # 9.4
740 'ins' => array_merge( $common, array( 'cite', 'datetime' ) ),
741 'del' => array_merge( $common, array( 'cite', 'datetime' ) ),
742
743 # 10.2
744 'ul' => array_merge( $common, array( 'type' ) ),
745 'ol' => array_merge( $common, array( 'type', 'start' ) ),
746 'li' => array_merge( $common, array( 'type', 'value' ) ),
747
748 # 10.3
749 'dl' => $common,
750 'dd' => $common,
751 'dt' => $common,
752
753 # 11.2.1
754 'table' => array_merge( $common,
755 array( 'summary', 'width', 'border', 'frame',
756 'rules', 'cellspacing', 'cellpadding',
757 'align', 'bgcolor', 'frame', 'rules',
758 'border' ) ),
759
760 # 11.2.2
761 'caption' => array_merge( $common, array( 'align' ) ),
762
763 # 11.2.3
764 'thead' => array_merge( $common, $tablealign ),
765 'tfoot' => array_merge( $common, $tablealign ),
766 'tbody' => array_merge( $common, $tablealign ),
767
768 # 11.2.4
769 'colgroup' => array_merge( $common, array( 'span', 'width' ), $tablealign ),
770 'col' => array_merge( $common, array( 'span', 'width' ), $tablealign ),
771
772 # 11.2.5
773 'tr' => array_merge( $common, array( 'bgcolor' ), $tablealign ),
774
775 # 11.2.6
776 'td' => array_merge( $common, $tablecell, $tablealign ),
777 'th' => array_merge( $common, $tablecell, $tablealign ),
778
779 # 15.2.1
780 'tt' => $common,
781 'b' => $common,
782 'i' => $common,
783 'big' => $common,
784 'small' => $common,
785 'strike' => $common,
786 's' => $common,
787 'u' => $common,
788
789 # 15.2.2
790 'font' => array_merge( $common, array( 'size', 'color', 'face' ) ),
791 # basefont
792
793 # 15.3
794 'hr' => array_merge( $common, array( 'noshade', 'size', 'width' ) ),
795
796 # XHTML Ruby annotation text module, simple ruby only.
797 # http://www.w3c.org/TR/ruby/
798 'ruby' => $common,
799 # rbc
800 # rtc
801 'rb' => $common,
802 'rt' => $common, #array_merge( $common, array( 'rbspan' ) ),
803 'rp' => $common,
804 );
805 return $whitelist;
806 }
807
808 /**
809 * Take a fragment of (potentially invalid) HTML and return
810 * a version with any tags removed, encoded suitably for literal
811 * inclusion in an attribute value.
812 *
813 * @param string $text HTML fragment
814 * @return string
815 */
816 function stripAllTags( $text ) {
817 # Actual <tags>
818 $text = preg_replace( '/<[^>]*>/', '', $text );
819
820 # Normalize &entities and whitespace
821 $text = Sanitizer::normalizeAttributeValue( $text );
822
823 # Will be placed into "double-quoted" attributes,
824 # make sure remaining bits are safe.
825 $text = str_replace(
826 array('<', '>', '"'),
827 array('&lt;', '&gt;', '&quot;'),
828 $text );
829
830 return $text;
831 }
832
833 }
834
835 ?>
MediaWiki Core