et al * http://www.mediawiki.org/ * * This program is free 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 Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @addtogroup Parser */ /** * Regular expression to match various types of character references in * Sanitizer::normalizeCharReferences and Sanitizer::decodeCharReferences */ define( 'MW_CHAR_REFS_REGEX', '/&([A-Za-z0-9\x80-\xff]+); |&\#([0-9]+); |&\#x([0-9A-Za-z]+); |&\#X([0-9A-Za-z]+); |(&)/x' ); /** * Regular expression to match HTML/XML attribute pairs within a tag. * Allows some... latitude. * Used in Sanitizer::fixTagAttributes and Sanitizer::decodeTagAttributes */ $attrib = '[A-Za-z0-9]'; $space = '[\x09\x0a\x0d\x20]'; define( 'MW_ATTRIBS_REGEX', "/(?:^|$space)($attrib+) ($space*=$space* (?: # The attribute value: quoted or alone \"([^<\"]*)\" | '([^<']*)' | ([a-zA-Z0-9!#$%&()*,\\-.\\/:;<>?@[\\]^_`{|}~]+) | (\#[0-9a-fA-F]+) # Technically wrong, but lots of # colors are specified like this. # We'll be normalizing it. ) )?(?=$space|\$)/sx" ); /** * List of all named character entities defined in HTML 4.01 * http://www.w3.org/TR/html4/sgml/entities.html * @private */ global $wgHtmlEntities; $wgHtmlEntities = array( 'Aacute' => 193, 'aacute' => 225, 'Acirc' => 194, 'acirc' => 226, 'acute' => 180, 'AElig' => 198, 'aelig' => 230, 'Agrave' => 192, 'agrave' => 224, 'alefsym' => 8501, 'Alpha' => 913, 'alpha' => 945, 'amp' => 38, 'and' => 8743, 'ang' => 8736, 'Aring' => 197, 'aring' => 229, 'asymp' => 8776, 'Atilde' => 195, 'atilde' => 227, 'Auml' => 196, 'auml' => 228, 'bdquo' => 8222, 'Beta' => 914, 'beta' => 946, 'brvbar' => 166, 'bull' => 8226, 'cap' => 8745, 'Ccedil' => 199, 'ccedil' => 231, 'cedil' => 184, 'cent' => 162, 'Chi' => 935, 'chi' => 967, 'circ' => 710, 'clubs' => 9827, 'cong' => 8773, 'copy' => 169, 'crarr' => 8629, 'cup' => 8746, 'curren' => 164, 'dagger' => 8224, 'Dagger' => 8225, 'darr' => 8595, 'dArr' => 8659, 'deg' => 176, 'Delta' => 916, 'delta' => 948, 'diams' => 9830, 'divide' => 247, 'Eacute' => 201, 'eacute' => 233, 'Ecirc' => 202, 'ecirc' => 234, 'Egrave' => 200, 'egrave' => 232, 'empty' => 8709, 'emsp' => 8195, 'ensp' => 8194, 'Epsilon' => 917, 'epsilon' => 949, 'equiv' => 8801, 'Eta' => 919, 'eta' => 951, 'ETH' => 208, 'eth' => 240, 'Euml' => 203, 'euml' => 235, 'euro' => 8364, 'exist' => 8707, 'fnof' => 402, 'forall' => 8704, 'frac12' => 189, 'frac14' => 188, 'frac34' => 190, 'frasl' => 8260, 'Gamma' => 915, 'gamma' => 947, 'ge' => 8805, 'gt' => 62, 'harr' => 8596, 'hArr' => 8660, 'hearts' => 9829, 'hellip' => 8230, 'Iacute' => 205, 'iacute' => 237, 'Icirc' => 206, 'icirc' => 238, 'iexcl' => 161, 'Igrave' => 204, 'igrave' => 236, 'image' => 8465, 'infin' => 8734, 'int' => 8747, 'Iota' => 921, 'iota' => 953, 'iquest' => 191, 'isin' => 8712, 'Iuml' => 207, 'iuml' => 239, 'Kappa' => 922, 'kappa' => 954, 'Lambda' => 923, 'lambda' => 955, 'lang' => 9001, 'laquo' => 171, 'larr' => 8592, 'lArr' => 8656, 'lceil' => 8968, 'ldquo' => 8220, 'le' => 8804, 'lfloor' => 8970, 'lowast' => 8727, 'loz' => 9674, 'lrm' => 8206, 'lsaquo' => 8249, 'lsquo' => 8216, 'lt' => 60, 'macr' => 175, 'mdash' => 8212, 'micro' => 181, 'middot' => 183, 'minus' => 8722, 'Mu' => 924, 'mu' => 956, 'nabla' => 8711, 'nbsp' => 160, 'ndash' => 8211, 'ne' => 8800, 'ni' => 8715, 'not' => 172, 'notin' => 8713, 'nsub' => 8836, 'Ntilde' => 209, 'ntilde' => 241, 'Nu' => 925, 'nu' => 957, 'Oacute' => 211, 'oacute' => 243, 'Ocirc' => 212, 'ocirc' => 244, 'OElig' => 338, 'oelig' => 339, 'Ograve' => 210, 'ograve' => 242, 'oline' => 8254, 'Omega' => 937, 'omega' => 969, 'Omicron' => 927, 'omicron' => 959, 'oplus' => 8853, 'or' => 8744, 'ordf' => 170, 'ordm' => 186, 'Oslash' => 216, 'oslash' => 248, 'Otilde' => 213, 'otilde' => 245, 'otimes' => 8855, 'Ouml' => 214, 'ouml' => 246, 'para' => 182, 'part' => 8706, 'permil' => 8240, 'perp' => 8869, 'Phi' => 934, 'phi' => 966, 'Pi' => 928, 'pi' => 960, 'piv' => 982, 'plusmn' => 177, 'pound' => 163, 'prime' => 8242, 'Prime' => 8243, 'prod' => 8719, 'prop' => 8733, 'Psi' => 936, 'psi' => 968, 'quot' => 34, 'radic' => 8730, 'rang' => 9002, 'raquo' => 187, 'rarr' => 8594, 'rArr' => 8658, 'rceil' => 8969, 'rdquo' => 8221, 'real' => 8476, 'reg' => 174, 'rfloor' => 8971, 'Rho' => 929, 'rho' => 961, 'rlm' => 8207, 'rsaquo' => 8250, 'rsquo' => 8217, 'sbquo' => 8218, 'Scaron' => 352, 'scaron' => 353, 'sdot' => 8901, 'sect' => 167, 'shy' => 173, 'Sigma' => 931, 'sigma' => 963, 'sigmaf' => 962, 'sim' => 8764, 'spades' => 9824, 'sub' => 8834, 'sube' => 8838, 'sum' => 8721, 'sup' => 8835, 'sup1' => 185, 'sup2' => 178, 'sup3' => 179, 'supe' => 8839, 'szlig' => 223, 'Tau' => 932, 'tau' => 964, 'there4' => 8756, 'Theta' => 920, 'theta' => 952, 'thetasym' => 977, 'thinsp' => 8201, 'THORN' => 222, 'thorn' => 254, 'tilde' => 732, 'times' => 215, 'trade' => 8482, 'Uacute' => 218, 'uacute' => 250, 'uarr' => 8593, 'uArr' => 8657, 'Ucirc' => 219, 'ucirc' => 251, 'Ugrave' => 217, 'ugrave' => 249, 'uml' => 168, 'upsih' => 978, 'Upsilon' => 933, 'upsilon' => 965, 'Uuml' => 220, 'uuml' => 252, 'weierp' => 8472, 'Xi' => 926, 'xi' => 958, 'Yacute' => 221, 'yacute' => 253, 'yen' => 165, 'Yuml' => 376, 'yuml' => 255, 'Zeta' => 918, 'zeta' => 950, 'zwj' => 8205, 'zwnj' => 8204 ); /** * Character entity aliases accepted by MediaWiki */ global $wgHtmlEntityAliases; $wgHtmlEntityAliases = array( 'רלמ' => 'rlm', 'رلم' => 'rlm', ); /** * XHTML sanitizer for MediaWiki * @addtogroup Parser */ class Sanitizer { /** * Cleans up HTML, removes dangerous tags and attributes, and * removes HTML comments * @private * @param string $text * @param callback $processCallback to do any variable or parameter replacements in HTML attribute values * @param array $args for the processing callback * @return string */ static function removeHTMLtags( $text, $processCallback = null, $args = array() ) { global $wgUseTidy; static $htmlpairs, $htmlsingle, $htmlsingleonly, $htmlnest, $tabletags, $htmllist, $listtags, $htmlsingleallowed, $htmlelements, $staticInitialised; wfProfileIn( __METHOD__ ); if ( !$staticInitialised ) { $htmlpairs = array( # Tags that must be closed 'b', 'del', 'i', 'ins', 'u', 'font', 'big', 'small', 'sub', 'sup', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'cite', 'code', 'em', 's', 'strike', 'strong', 'tt', 'var', 'div', 'center', 'blockquote', 'ol', 'ul', 'dl', 'table', 'caption', 'pre', 'ruby', 'rt' , 'rb' , 'rp', 'p', 'span', 'u' ); $htmlsingle = array( 'br', 'hr', 'li', 'dt', 'dd' ); $htmlsingleonly = array( # Elements that cannot have close tags 'br', 'hr' ); $htmlnest = array( # Tags that can be nested--?? 'table', 'tr', 'td', 'th', 'div', 'blockquote', 'ol', 'ul', 'dl', 'font', 'big', 'small', 'sub', 'sup', 'span' ); $tabletags = array( # Can only appear inside table, we will close them 'td', 'th', 'tr', ); $htmllist = array( # Tags used by list 'ul','ol', ); $listtags = array( # Tags that can appear in a list 'li', ); $htmlsingleallowed = array_merge( $htmlsingle, $tabletags ); $htmlelements = array_merge( $htmlsingle, $htmlpairs, $htmlnest ); # Convert them all to hashtables for faster lookup $vars = array( 'htmlpairs', 'htmlsingle', 'htmlsingleonly', 'htmlnest', 'tabletags', 'htmllist', 'listtags', 'htmlsingleallowed', 'htmlelements' ); foreach ( $vars as $var ) { $$var = array_flip( $$var ); } $staticInitialised = true; } # Remove HTML comments $text = Sanitizer::removeHTMLcomments( $text ); $bits = explode( '<', $text ); $text = str_replace( '>', '>', array_shift( $bits ) ); if(!$wgUseTidy) { $tagstack = $tablestack = array(); foreach ( $bits as $x ) { $regs = array(); if( preg_match( '!^(/?)(\\w+)([^>]*?)(/{0,1}>)([^<]*)$!', $x, $regs ) ) { list( /* $qbar */, $slash, $t, $params, $brace, $rest ) = $regs; } else { $slash = $t = $params = $brace = $rest = null; } $badtag = 0 ; if ( isset( $htmlelements[$t = strtolower( $t )] ) ) { # Check our stack if ( $slash ) { # Closing a tag... if( isset( $htmlsingleonly[$t] ) ) { $badtag = 1; } elseif ( ( $ot = @array_pop( $tagstack ) ) != $t ) { if ( isset( $htmlsingleallowed[$ot] ) ) { # Pop all elements with an optional close tag # and see if we find a match below them $optstack = array(); array_push ($optstack, $ot); while ( ( ( $ot = @array_pop( $tagstack ) ) != $t ) && isset( $htmlsingleallowed[$ot] ) ) { array_push ($optstack, $ot); } if ( $t != $ot ) { # No match. Push the optinal elements back again $badtag = 1; while ( $ot = @array_pop( $optstack ) ) { array_push( $tagstack, $ot ); } } } else { @array_push( $tagstack, $ot ); #
  • can be nested in