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 * * @file * @ingroup 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)((?:xml:|xmlns:)?$attrib+) ($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. ) )?(?=$space|\$)/sx" ); /** * Regular expression to match URIs that could trigger script execution */ define( 'MW_EVIL_URI_PATTERN', '!(^|\s|\*/\s*)(javascript|vbscript)([^\w]|$)!i' ); /** * Regular expression to match namespace attributes */ define( 'MW_XMLNS_ATTRIBUTE_PATTRN', "/^xmlns:$attrib+$/" ); /** * 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 * @ingroup Parser */ class Sanitizer { /** * Cleans up HTML, removes dangerous tags and attributes, and * removes HTML comments * @private * @param $text String * @param $processCallback Callback to do any variable or parameter replacements in HTML attribute values * @param $args Array for the processing callback * @param $extratags Array for any extra tags to include * @param $removetags Array for any tags (default or extra) to exclude * @return string */ static function removeHTMLtags( $text, $processCallback = null, $args = array(), $extratags = array(), $removetags = array() ) { global $wgUseTidy; static $htmlpairsStatic, $htmlsingle, $htmlsingleonly, $htmlnest, $tabletags, $htmllist, $listtags, $htmlsingleallowed, $htmlelementsStatic, $staticInitialised; wfProfileIn( __METHOD__ ); if ( !$staticInitialised ) { $htmlpairsStatic = 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', 'abbr' ); $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_unique( array_merge( $htmlsingle, $tabletags ) ); $htmlelementsStatic = array_unique( array_merge( $htmlsingle, $htmlpairsStatic, $htmlnest ) ); # Convert them all to hashtables for faster lookup $vars = array( 'htmlpairsStatic', 'htmlsingle', 'htmlsingleonly', 'htmlnest', 'tabletags', 'htmllist', 'listtags', 'htmlsingleallowed', 'htmlelementsStatic' ); foreach ( $vars as $var ) { $$var = array_flip( $$var ); } $staticInitialised = true; } # Populate $htmlpairs and $htmlelements with the $extratags and $removetags arrays $extratags = array_flip( $extratags ); $removetags = array_flip( $removetags ); $htmlpairs = array_merge( $extratags, $htmlpairsStatic ); $htmlelements = array_diff_key( array_merge( $extratags, $htmlelementsStatic ) , $removetags ); # 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(); # $slash: Does the current element start with a '/'? # $t: Current element name # $params: String between element name and > # $brace: Ending '>' or '/>' # $rest: Everything until the next element of $bits if( preg_match( '!^(/?)(\\w+)([^>]*?)(/{0,1}>)([^<]*)$!', $x, $regs ) ) { list( /* $qbar */, $slash, $t, $params, $brace, $rest ) = $regs; } else { $slash = $t = $params = $brace = $rest = null; } $badtag = false; if ( isset( $htmlelements[$t = strtolower( $t )] ) ) { # Check our stack if ( $slash && isset( $htmlsingleonly[$t] ) ) { $badtag = true; } elseif ( $slash ) { # Closing a tag... is it the one we just opened? $ot = @array_pop( $tagstack ); if ( $ot != $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 ); $ot = @array_pop( $tagstack ); while ( $ot != $t && isset( $htmlsingleallowed[$ot] ) ) { array_push( $optstack, $ot ); $ot = @array_pop( $tagstack ); } if ( $t != $ot ) { # No match. Push the optional elements back again $badtag = true; while ( $ot = @array_pop( $optstack ) ) { array_push( $tagstack, $ot ); } } } else { @array_push( $tagstack, $ot ); #
  • can be nested in