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| 1 | <?php |
| 2 | declare( strict_types = 1 ); |
| 3 | |
| 4 | namespace Wikimedia\Parsoid\Wt2Html\TT; |
| 5 | |
| 6 | use Wikimedia\Parsoid\Core\Sanitizer; |
| 7 | use Wikimedia\Parsoid\NodeData\DataParsoid; |
| 8 | use Wikimedia\Parsoid\Tokens\EndTagTk; |
| 9 | use Wikimedia\Parsoid\Tokens\KV; |
| 10 | use Wikimedia\Parsoid\Tokens\SelfclosingTagTk; |
| 11 | use Wikimedia\Parsoid\Tokens\TagTk; |
| 12 | use Wikimedia\Parsoid\Tokens\Token; |
| 13 | use Wikimedia\Parsoid\Utils\PipelineUtils; |
| 14 | use Wikimedia\Parsoid\Utils\TokenUtils; |
| 15 | use Wikimedia\Parsoid\Wt2Html\PegTokenizer; |
| 16 | |
| 17 | class ExternalLinkHandler extends TokenHandler { |
| 18 | /** @var PegTokenizer */ |
| 19 | private $urlParser; |
| 20 | |
| 21 | /** @inheritDoc */ |
| 22 | public function __construct( object $manager, array $options ) { |
| 23 | parent::__construct( $manager, $options ); |
| 24 | |
| 25 | // Create a new peg parser for image options. |
| 26 | if ( !$this->urlParser ) { |
| 27 | // Actually the regular tokenizer, but we'll call it with the |
| 28 | // url rule only. |
| 29 | $this->urlParser = new PegTokenizer( $this->env ); |
| 30 | } |
| 31 | } |
| 32 | |
| 33 | private static function imageExtensions( string $str ): bool { |
| 34 | switch ( $str ) { |
| 35 | case 'jpg': // fall through |
| 36 | case 'png': // fall through |
| 37 | case 'gif': // fall through |
| 38 | case 'svg': |
| 39 | return true; |
| 40 | default: |
| 41 | return false; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | private function arraySome( array $array, callable $fn ): bool { |
| 46 | foreach ( $array as $value ) { |
| 47 | if ( $fn( $value ) ) { |
| 48 | return true; |
| 49 | } |
| 50 | } |
| 51 | return false; |
| 52 | } |
| 53 | |
| 54 | private function hasImageLink( string $href ): bool { |
| 55 | $allowedPrefixes = $this->env->getSiteConfig()->allowedExternalImagePrefixes(); |
| 56 | $bits = explode( '.', $href ); |
| 57 | $hasImageExtension = count( $bits ) > 1 && |
| 58 | self::imageExtensions( end( $bits ) ) && |
| 59 | preg_match( '#^https?://#i', $href ); |
| 60 | // Typical settings for mediawiki configuration variables |
| 61 | // $wgAllowExternalImages and $wgAllowExternalImagesFrom will |
| 62 | // result in values like these: |
| 63 | // allowedPrefixes = undefined; // no external images |
| 64 | // allowedPrefixes = ['']; // allow all external images |
| 65 | // allowedPrefixes = ['http://127.0.0.1/', 'http://example.com']; |
| 66 | // Note that the values include the http:// or https:// protocol. |
| 67 | // See https://phabricator.wikimedia.org/T53092 |
| 68 | return $hasImageExtension && |
| 69 | // true if some prefix in the list matches href |
| 70 | self::arraySome( $allowedPrefixes, static function ( string $prefix ) use ( &$href ) { |
| 71 | return $prefix === "" || strpos( $href, $prefix ) === 0; |
| 72 | } ); |
| 73 | } |
| 74 | |
| 75 | private function onUrlLink( Token $token ): ?TokenHandlerResult { |
| 76 | $tagAttrs = null; |
| 77 | $builtTag = null; |
| 78 | $env = $this->env; |
| 79 | $origHref = $token->getAttributeV( 'href' ); |
| 80 | $href = TokenUtils::tokensToString( $origHref ); |
| 81 | $dataParsoid = $token->dataParsoid->clone(); |
| 82 | |
| 83 | if ( $this->hasImageLink( $href ) ) { |
| 84 | $checkAlt = explode( '/', $href ); |
| 85 | $tagAttrs = [ |
| 86 | new KV( 'src', $href ), |
| 87 | new KV( 'alt', end( $checkAlt ) ), |
| 88 | new KV( 'rel', 'mw:externalImage' ) |
| 89 | ]; |
| 90 | |
| 91 | // combine with existing rdfa attrs |
| 92 | $tagAttrs = WikiLinkHandler::buildLinkAttrs( |
| 93 | $token->attribs, false, null, $tagAttrs )['attribs']; |
| 94 | return new TokenHandlerResult( |
| 95 | [ new SelfclosingTagTk( 'img', $tagAttrs, $dataParsoid ) ] ); |
| 96 | } else { |
| 97 | $tagAttrs = [ |
| 98 | new KV( 'rel', 'mw:ExtLink' ) |
| 99 | ]; |
| 100 | |
| 101 | // combine with existing rdfa attrs |
| 102 | // href is set explicitly below |
| 103 | $tagAttrs = WikiLinkHandler::buildLinkAttrs( |
| 104 | $token->attribs, false, null, $tagAttrs )['attribs']; |
| 105 | $builtTag = new TagTk( 'a', $tagAttrs, $dataParsoid ); |
| 106 | $dataParsoid->stx = 'url'; |
| 107 | |
| 108 | if ( !$this->options['inTemplate'] ) { |
| 109 | // Since we messed with the text of the link, we need |
| 110 | // to preserve the original in the RT data. Or else. |
| 111 | $builtTag->addNormalizedAttribute( |
| 112 | 'href', $href, $token->getWTSource( $this->manager->getFrame() ) |
| 113 | ); |
| 114 | } else { |
| 115 | $builtTag->addAttribute( 'href', $href ); |
| 116 | } |
| 117 | |
| 118 | $dp = new DataParsoid; |
| 119 | $dp->tsr = $dataParsoid->tsr->expandTsrK()->value; |
| 120 | return new TokenHandlerResult( [ |
| 121 | $builtTag, |
| 122 | // Make sure there are no IDN-ignored characters in the text so |
| 123 | // the user doesn't accidentally copy any. |
| 124 | Sanitizer::cleanUrl( $env->getSiteConfig(), $href, '' ), // mode could be 'wikilink' |
| 125 | new EndTagTk( |
| 126 | 'a', |
| 127 | [], |
| 128 | $dp |
| 129 | ) |
| 130 | ] |
| 131 | ); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Bracketed external link |
| 137 | * @param Token $token |
| 138 | * @return TokenHandlerResult|null |
| 139 | */ |
| 140 | private function onExtLink( Token $token ): ?TokenHandlerResult { |
| 141 | $newAttrs = null; |
| 142 | $aStart = null; |
| 143 | $env = $this->env; |
| 144 | $origHref = $token->getAttributeV( 'href' ); |
| 145 | $hasExpandedAttrs = TokenUtils::hasTypeOf( $token, 'mw:ExpandedAttrs' ); |
| 146 | $href = TokenUtils::tokensToString( $origHref ); |
| 147 | $hrefWithEntities = TokenUtils::tokensToString( $origHref, false, [ |
| 148 | 'includeEntities' => true |
| 149 | ] |
| 150 | ); |
| 151 | $content = $token->getAttributeV( 'mw:content' ); |
| 152 | $dataParsoid = $token->dataParsoid->clone(); |
| 153 | $magLinkType = TokenUtils::matchTypeOf( |
| 154 | $token, '#^mw:(Ext|Wiki)Link/(ISBN|RFC|PMID)$#' |
| 155 | ); |
| 156 | $tokens = null; |
| 157 | |
| 158 | if ( $magLinkType ) { |
| 159 | $newHref = $href; |
| 160 | $newRel = 'mw:ExtLink'; |
| 161 | if ( str_ends_with( $magLinkType, '/ISBN' ) ) { |
| 162 | $newHref = $env->getSiteConfig()->relativeLinkPrefix() . $href; |
| 163 | // ISBNs use mw:WikiLink instead of mw:ExtLink |
| 164 | $newRel = 'mw:WikiLink'; |
| 165 | } |
| 166 | $newAttrs = [ |
| 167 | new KV( 'href', $newHref ), |
| 168 | new KV( 'rel', $newRel ) |
| 169 | ]; |
| 170 | $token->removeAttribute( 'typeof' ); |
| 171 | |
| 172 | // SSS FIXME: Right now, Parsoid does not support templating |
| 173 | // of ISBN attributes. So, "ISBN {{1x|1234567890}}" will not |
| 174 | // parse as you might expect it to. As a result, this code below |
| 175 | // that attempts to combine rdf attrs from earlier is unnecessary |
| 176 | // right now. But, it will become necessary if Parsoid starts |
| 177 | // supporting templating of ISBN attributes. |
| 178 | // |
| 179 | // combine with existing rdfa attrs |
| 180 | $newAttrs = WikiLinkHandler::buildLinkAttrs( |
| 181 | $token->attribs, false, null, $newAttrs )['attribs']; |
| 182 | $aStart = new TagTk( 'a', $newAttrs, $dataParsoid ); |
| 183 | $tokens = array_merge( [ $aStart ], |
| 184 | is_array( $content ) ? $content : [ $content ], [ new EndTagTk( 'a' ) ] ); |
| 185 | return new TokenHandlerResult( $tokens ); |
| 186 | } elseif ( ( !$hasExpandedAttrs && is_string( $origHref ) ) || |
| 187 | $this->urlParser->tokenizeURL( $hrefWithEntities ) !== false |
| 188 | ) { |
| 189 | if ( is_array( $content ) && count( $content ) === 1 && is_string( $content[0] ) ) { |
| 190 | $src = $content[0]; |
| 191 | if ( $env->getSiteConfig()->hasValidProtocol( $src ) && |
| 192 | $this->urlParser->tokenizeURL( $src ) !== false && |
| 193 | $this->hasImageLink( $src ) |
| 194 | ) { |
| 195 | $checkAlt = explode( '/', $src ); |
| 196 | $dp = new DataParsoid; |
| 197 | $dp->type = 'extlink'; |
| 198 | $content = [ new SelfclosingTagTk( 'img', [ |
| 199 | new KV( 'src', $src ), |
| 200 | new KV( 'alt', end( $checkAlt ) ) |
| 201 | ], $dp |
| 202 | ) ]; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | $newAttrs = [ new KV( 'rel', 'mw:ExtLink' ) ]; |
| 207 | // combine with existing rdfa attrs |
| 208 | // href is set explicitly below |
| 209 | $newAttrs = WikiLinkHandler::buildLinkAttrs( |
| 210 | $token->attribs, false, null, $newAttrs )['attribs']; |
| 211 | $aStart = new TagTk( 'a', $newAttrs, $dataParsoid ); |
| 212 | |
| 213 | if ( !$this->options['inTemplate'] ) { |
| 214 | // If we are from a top-level page, add normalized attr info for |
| 215 | // accurate roundtripping of original content. |
| 216 | // |
| 217 | // extLinkContentOffsets->start covers all spaces before content |
| 218 | // and we need src without those spaces. |
| 219 | $tsr0a = $dataParsoid->tsr->start + 1; |
| 220 | $tsr1a = $dataParsoid->extLinkContentOffsets->start - |
| 221 | strlen( $token->getAttributeV( 'spaces' ) ?? '' ); |
| 222 | $length = $tsr1a - $tsr0a; |
| 223 | $aStart->addNormalizedAttribute( 'href', $href, |
| 224 | substr( $this->manager->getFrame()->getSrcText(), $tsr0a, $length ) ); |
| 225 | } else { |
| 226 | $aStart->addAttribute( 'href', $href ); |
| 227 | } |
| 228 | |
| 229 | $content = PipelineUtils::getDOMFragmentToken( |
| 230 | $content, |
| 231 | $dataParsoid->tsr ? $dataParsoid->extLinkContentOffsets : null, |
| 232 | [ 'inlineContext' => true, 'token' => $token ] |
| 233 | ); |
| 234 | |
| 235 | $tokens = [ $aStart, $content, new EndTagTk( 'a' ) ]; |
| 236 | return new TokenHandlerResult( $tokens ); |
| 237 | } else { |
| 238 | // Not a link, convert href to plain text. |
| 239 | return new TokenHandlerResult( WikiLinkHandler::bailTokens( $this->manager, $token ) ); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | /** @inheritDoc */ |
| 244 | public function onTag( Token $token ): ?TokenHandlerResult { |
| 245 | switch ( $token->getName() ) { |
| 246 | case 'urllink': |
| 247 | return $this->onUrlLink( $token ); |
| 248 | case 'extlink': |
| 249 | return $this->onExtLink( $token ); |
| 250 | default: |
| 251 | return null; |
| 252 | } |
| 253 | } |
| 254 | } |