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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\TemplateStyles; |
| 4 | |
| 5 | /** |
| 6 | * @file |
| 7 | * @license GPL-2.0-or-later |
| 8 | */ |
| 9 | |
| 10 | use InvalidArgumentException; |
| 11 | use MapCacheLRU; |
| 12 | use MediaWiki\Config\Config; |
| 13 | use MediaWiki\Content\ContentHandler; |
| 14 | use MediaWiki\Extension\TemplateStyles\Hooks\HookRunner; |
| 15 | use MediaWiki\Hook\ParserClearStateHook; |
| 16 | use MediaWiki\Hook\ParserFirstCallInitHook; |
| 17 | use MediaWiki\Html\Html; |
| 18 | use MediaWiki\MediaWikiServices; |
| 19 | use MediaWiki\Parser\Parser; |
| 20 | use MediaWiki\Parser\PPFrame; |
| 21 | use MediaWiki\Registration\ExtensionRegistry; |
| 22 | use MediaWiki\Revision\Hook\ContentHandlerDefaultModelForHook; |
| 23 | use MediaWiki\Revision\SlotRecord; |
| 24 | use MediaWiki\Title\Title; |
| 25 | use Wikimedia\CSS\Grammar\CheckedMatcher; |
| 26 | use Wikimedia\CSS\Grammar\GrammarMatch; |
| 27 | use Wikimedia\CSS\Grammar\MatcherFactory; |
| 28 | use Wikimedia\CSS\Objects\ComponentValue; |
| 29 | use Wikimedia\CSS\Objects\ComponentValueList; |
| 30 | use Wikimedia\CSS\Objects\Token; |
| 31 | use Wikimedia\CSS\Parser\Parser as CSSParser; |
| 32 | use Wikimedia\CSS\Sanitizer\KeyframesAtRuleSanitizer; |
| 33 | use Wikimedia\CSS\Sanitizer\MediaAtRuleSanitizer; |
| 34 | use Wikimedia\CSS\Sanitizer\NamespaceAtRuleSanitizer; |
| 35 | use Wikimedia\CSS\Sanitizer\PageAtRuleSanitizer; |
| 36 | use Wikimedia\CSS\Sanitizer\Sanitizer; |
| 37 | use Wikimedia\CSS\Sanitizer\StylePropertySanitizer; |
| 38 | use Wikimedia\CSS\Sanitizer\StyleRuleSanitizer; |
| 39 | use Wikimedia\CSS\Sanitizer\StylesheetSanitizer; |
| 40 | use Wikimedia\CSS\Sanitizer\SupportsAtRuleSanitizer; |
| 41 | |
| 42 | /** |
| 43 | * TemplateStyles extension hooks |
| 44 | */ |
| 45 | class Hooks implements |
| 46 | ParserFirstCallInitHook, |
| 47 | ParserClearStateHook, |
| 48 | ContentHandlerDefaultModelForHook |
| 49 | { |
| 50 | |
| 51 | /** @var MatcherFactory|null */ |
| 52 | private static $matcherFactory = null; |
| 53 | |
| 54 | /** @var Sanitizer[] */ |
| 55 | private static $sanitizers = []; |
| 56 | |
| 57 | /** @var (false|Token[])[] */ |
| 58 | private static $wrappers = []; |
| 59 | |
| 60 | /** |
| 61 | * @return Config |
| 62 | * @codeCoverageIgnore |
| 63 | */ |
| 64 | public static function getConfig() { |
| 65 | return MediaWikiServices::getInstance()->getConfigFactory() |
| 66 | ->makeConfig( 'templatestyles' ); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * @return MatcherFactory |
| 71 | * @codeCoverageIgnore |
| 72 | */ |
| 73 | private static function getMatcherFactory() { |
| 74 | if ( !self::$matcherFactory ) { |
| 75 | self::$matcherFactory = new TemplateStylesMatcherFactory( |
| 76 | self::getConfig()->get( 'TemplateStylesAllowedUrls' ) |
| 77 | ); |
| 78 | } |
| 79 | return self::$matcherFactory; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Validate an extra wrapper-selector |
| 84 | * @param string $wrapper |
| 85 | * @return ComponentValue[]|false Representation of the selector, or false on failure |
| 86 | */ |
| 87 | private static function validateExtraWrapper( $wrapper ) { |
| 88 | if ( !isset( self::$wrappers[$wrapper] ) ) { |
| 89 | $cssParser = CSSParser::newFromString( $wrapper ); |
| 90 | $components = $cssParser->parseComponentValueList(); |
| 91 | if ( $cssParser->getParseErrors() ) { |
| 92 | $match = false; |
| 93 | } else { |
| 94 | $match = self::getMatcherFactory()->cssSimpleSelectorSeq() |
| 95 | ->matchAgainst( $components, [ 'mark-significance' => true ] ); |
| 96 | } |
| 97 | self::$wrappers[$wrapper] = $match ? $components->toComponentValueArray() : false; |
| 98 | } |
| 99 | return self::$wrappers[$wrapper]; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * @param string $class Class to limit selectors to |
| 104 | * @param string|null $extraWrapper Extra selector to limit selectors to |
| 105 | * @return Sanitizer |
| 106 | */ |
| 107 | public static function getSanitizer( $class, $extraWrapper = null ) { |
| 108 | $key = $extraWrapper !== null ? "$class $extraWrapper" : $class; |
| 109 | if ( !isset( self::$sanitizers[$key] ) ) { |
| 110 | $config = self::getConfig(); |
| 111 | $matcherFactory = self::getMatcherFactory(); |
| 112 | |
| 113 | $propertySanitizer = new StylePropertySanitizer( $matcherFactory ); |
| 114 | $propertySanitizer->setKnownProperties( array_diff_key( |
| 115 | $propertySanitizer->getKnownProperties(), |
| 116 | array_flip( $config->get( 'TemplateStylesDisallowedProperties' ) ) |
| 117 | ) ); |
| 118 | $hookRunner = new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ); |
| 119 | $hookRunner->onTemplateStylesPropertySanitizer( $propertySanitizer, $matcherFactory ); |
| 120 | |
| 121 | $htmlOrBodySimpleSelectorSeqMatcher = new CheckedMatcher( |
| 122 | $matcherFactory->cssSimpleSelectorSeq(), |
| 123 | static function ( ComponentValueList $values, GrammarMatch $match, array $options ) { |
| 124 | foreach ( $match->getCapturedMatches() as $m ) { |
| 125 | if ( $m->getName() !== 'element' ) { |
| 126 | continue; |
| 127 | } |
| 128 | $str = (string)$m; |
| 129 | return $str === 'html' || $str === 'body'; |
| 130 | } |
| 131 | return false; |
| 132 | } |
| 133 | ); |
| 134 | |
| 135 | $prependSelectors = [ |
| 136 | new Token( Token::T_DELIM, '.' ), |
| 137 | new Token( Token::T_IDENT, $class ), |
| 138 | ]; |
| 139 | if ( $extraWrapper !== null ) { |
| 140 | $extraComponentValues = self::validateExtraWrapper( $extraWrapper ); |
| 141 | if ( !$extraComponentValues ) { |
| 142 | throw new InvalidArgumentException( "Invalid value for \$extraWrapper: $extraWrapper" ); |
| 143 | } |
| 144 | $prependSelectors = array_merge( |
| 145 | $prependSelectors, |
| 146 | [ new Token( Token::T_WHITESPACE, [ 'significant' => true ] ) ], |
| 147 | $extraComponentValues |
| 148 | ); |
| 149 | } |
| 150 | |
| 151 | $disallowedAtRules = $config->get( 'TemplateStylesDisallowedAtRules' ); |
| 152 | |
| 153 | $ruleSanitizers = [ |
| 154 | 'styles' => new StyleRuleSanitizer( |
| 155 | $matcherFactory->cssSelectorList(), |
| 156 | $propertySanitizer, |
| 157 | [ |
| 158 | 'prependSelectors' => $prependSelectors, |
| 159 | 'hoistableComponentMatcher' => $htmlOrBodySimpleSelectorSeqMatcher, |
| 160 | ] |
| 161 | ), |
| 162 | '@font-face' => new TemplateStylesFontFaceAtRuleSanitizer( $matcherFactory ), |
| 163 | '@keyframes' => new KeyframesAtRuleSanitizer( $matcherFactory, $propertySanitizer ), |
| 164 | '@page' => new PageAtRuleSanitizer( $matcherFactory, $propertySanitizer ), |
| 165 | '@media' => new MediaAtRuleSanitizer( $matcherFactory->cssMediaQueryList() ), |
| 166 | '@supports' => new SupportsAtRuleSanitizer( $matcherFactory, [ |
| 167 | 'declarationSanitizer' => $propertySanitizer, |
| 168 | ] ), |
| 169 | ]; |
| 170 | $ruleSanitizers = array_diff_key( $ruleSanitizers, array_flip( $disallowedAtRules ) ); |
| 171 | if ( isset( $ruleSanitizers['@media'] ) ) { |
| 172 | // In case @media was disallowed |
| 173 | $ruleSanitizers['@media']->setRuleSanitizers( $ruleSanitizers ); |
| 174 | } |
| 175 | if ( isset( $ruleSanitizers['@supports'] ) ) { |
| 176 | // In case @supports was disallowed |
| 177 | $ruleSanitizers['@supports']->setRuleSanitizers( $ruleSanitizers ); |
| 178 | } |
| 179 | |
| 180 | $allRuleSanitizers = $ruleSanitizers + [ |
| 181 | // Omit @import, it's not secure. Maybe someday we'll make an "@-mw-import" or something. |
| 182 | '@namespace' => new NamespaceAtRuleSanitizer( $matcherFactory ), |
| 183 | ]; |
| 184 | $allRuleSanitizers = array_diff_key( $allRuleSanitizers, $disallowedAtRules ); |
| 185 | $sanitizer = new StylesheetSanitizer( $allRuleSanitizers ); |
| 186 | $hookRunner->onTemplateStylesStylesheetSanitizer( |
| 187 | $sanitizer, $propertySanitizer, $matcherFactory |
| 188 | ); |
| 189 | self::$sanitizers[$key] = $sanitizer; |
| 190 | } |
| 191 | return self::$sanitizers[$key]; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Update $wgTextModelsToParse |
| 196 | */ |
| 197 | public static function onRegistration() { |
| 198 | // This gets called before ConfigFactory is set up, so I guess we need |
| 199 | // to use globals. |
| 200 | global $wgTextModelsToParse, $wgTemplateStylesAutoParseContent; |
| 201 | |
| 202 | if ( in_array( CONTENT_MODEL_CSS, $wgTextModelsToParse, true ) && |
| 203 | $wgTemplateStylesAutoParseContent |
| 204 | ) { |
| 205 | $wgTextModelsToParse[] = 'sanitized-css'; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Add `<templatestyles>` to the parser. |
| 211 | * @param Parser $parser Parser object being cleared |
| 212 | */ |
| 213 | public function onParserFirstCallInit( $parser ) { |
| 214 | $parser->setHook( 'templatestyles', [ __CLASS__, 'handleTag' ] ); |
| 215 | // 100 is arbitrary |
| 216 | $parser->extTemplateStylesCache = new MapCacheLRU( 100 ); |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Set the default content model to 'sanitized-css' when appropriate. |
| 221 | * @param Title $title the Title in question |
| 222 | * @param string &$model The model name |
| 223 | * @return bool |
| 224 | */ |
| 225 | public function onContentHandlerDefaultModelFor( $title, &$model ) { |
| 226 | // Allow overwriting attributes with config settings. |
| 227 | // Attributes can not use namespaces as keys, as processing them does not preserve |
| 228 | // integer keys. |
| 229 | $enabledNamespaces = self::getConfig()->get( 'TemplateStylesNamespaces' ) + |
| 230 | array_fill_keys( |
| 231 | ExtensionRegistry::getInstance()->getAttribute( 'TemplateStylesNamespaces' ), |
| 232 | true |
| 233 | ); |
| 234 | |
| 235 | if ( !empty( $enabledNamespaces[$title->getNamespace()] ) && |
| 236 | $title->isSubpage() && substr( $title->getText(), -4 ) === '.css' |
| 237 | ) { |
| 238 | $model = 'sanitized-css'; |
| 239 | return false; |
| 240 | } |
| 241 | return true; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * Clear our cache when the parser is reset |
| 246 | * @param Parser $parser |
| 247 | */ |
| 248 | public function onParserClearState( $parser ) { |
| 249 | $parser->extTemplateStylesCache->clear(); |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Parser hook for `<templatestyles>` |
| 254 | * @param string $text Contents of the tag (ignored). |
| 255 | * @param string[] $params Tag attributes |
| 256 | * @param Parser $parser |
| 257 | * @param PPFrame $frame |
| 258 | * @return string HTML |
| 259 | * @suppress SecurityCheck-XSS |
| 260 | */ |
| 261 | public static function handleTag( $text, $params, $parser, $frame ) { |
| 262 | $config = self::getConfig(); |
| 263 | if ( $config->get( 'TemplateStylesDisable' ) ) { |
| 264 | return ''; |
| 265 | } |
| 266 | |
| 267 | if ( !isset( $params['src'] ) || trim( $params['src'] ) === '' ) { |
| 268 | return self::formatTagError( $parser, [ 'templatestyles-missing-src' ] ); |
| 269 | } |
| 270 | |
| 271 | $extraWrapper = null; |
| 272 | if ( isset( $params['wrapper'] ) && trim( $params['wrapper'] ) !== '' ) { |
| 273 | $extraWrapper = trim( $params['wrapper'] ); |
| 274 | if ( !self::validateExtraWrapper( $extraWrapper ) ) { |
| 275 | return self::formatTagError( $parser, [ 'templatestyles-invalid-wrapper' ] ); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | // Default to the Template namespace because that's the most likely |
| 280 | // situation. We can't allow for subpage syntax like src="/styles.css" |
| 281 | // or the like, though, because stuff like substing and Parsoid would |
| 282 | // wind up wanting to make that relative to the wrong page. |
| 283 | $title = Title::newFromText( $params['src'], $config->get( 'TemplateStylesDefaultNamespace' ) ); |
| 284 | if ( !$title || $title->isExternal() ) { |
| 285 | return self::formatTagError( $parser, [ 'templatestyles-invalid-src' ] ); |
| 286 | } |
| 287 | |
| 288 | $revRecord = $parser->fetchCurrentRevisionRecordOfTitle( $title ); |
| 289 | |
| 290 | // It's not really a "template", but it has the same implications |
| 291 | // for needing reparse when the stylesheet is edited. |
| 292 | $parser->getOutput()->addTemplate( |
| 293 | $title, |
| 294 | $title->getArticleId(), |
| 295 | $revRecord ? $revRecord->getId() : null |
| 296 | ); |
| 297 | |
| 298 | $content = $revRecord ? $revRecord->getContent( SlotRecord::MAIN ) : null; |
| 299 | if ( !$content ) { |
| 300 | $titleText = $title->getPrefixedText(); |
| 301 | return self::formatTagError( $parser, [ |
| 302 | 'templatestyles-bad-src-missing', |
| 303 | $titleText, |
| 304 | wfEscapeWikiText( $titleText ) |
| 305 | ] ); |
| 306 | } |
| 307 | if ( !$content instanceof TemplateStylesContent ) { |
| 308 | $titleText = $title->getPrefixedText(); |
| 309 | return self::formatTagError( $parser, [ |
| 310 | 'templatestyles-bad-src', |
| 311 | $titleText, |
| 312 | wfEscapeWikiText( $titleText ), |
| 313 | ContentHandler::getLocalizedName( $content->getModel() ) |
| 314 | ] ); |
| 315 | } |
| 316 | |
| 317 | // If the revision actually has an ID, cache based on that. |
| 318 | // Otherwise, cache by hash. |
| 319 | if ( $revRecord->getId() ) { |
| 320 | $cacheKey = 'r' . $revRecord->getId(); |
| 321 | } else { |
| 322 | $cacheKey = sha1( $content->getText() ); |
| 323 | } |
| 324 | |
| 325 | // Include any non-default wrapper class in the cache key too |
| 326 | $wrapClass = $parser->getOptions()->getWrapOutputClass(); |
| 327 | if ( $wrapClass === false ) { |
| 328 | // deprecated |
| 329 | $wrapClass = 'mw-parser-output'; |
| 330 | } |
| 331 | if ( $wrapClass !== 'mw-parser-output' || $extraWrapper !== null ) { |
| 332 | $cacheKey .= '/' . $wrapClass; |
| 333 | if ( $extraWrapper !== null ) { |
| 334 | $cacheKey .= '/' . $extraWrapper; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | // Already cached? |
| 339 | if ( $parser->extTemplateStylesCache->has( $cacheKey ) ) { |
| 340 | return $parser->extTemplateStylesCache->get( $cacheKey ); |
| 341 | } |
| 342 | |
| 343 | $targetDir = $parser->getTargetLanguage()->getDir(); |
| 344 | $contentDir = $parser->getContentLanguage()->getDir(); |
| 345 | |
| 346 | $contentHandlerFactory = MediaWikiServices::getInstance()->getContentHandlerFactory(); |
| 347 | $contentHandler = $contentHandlerFactory->getContentHandler( $content->getModel() ); |
| 348 | '@phan-var TemplateStylesContentHandler $contentHandler'; |
| 349 | $status = $contentHandler->sanitize( |
| 350 | $content, |
| 351 | [ |
| 352 | 'flip' => $targetDir !== $contentDir, |
| 353 | 'minify' => true, |
| 354 | 'class' => $wrapClass, |
| 355 | 'extraWrapper' => $extraWrapper, |
| 356 | ] |
| 357 | ); |
| 358 | $style = $status->isOk() ? $status->getValue() : '/* Fatal error, no CSS will be output */'; |
| 359 | |
| 360 | // Prepend errors. This should normally never happen, but might if an |
| 361 | // update or configuration change causes something that was formerly |
| 362 | // valid to become invalid or something like that. |
| 363 | if ( !$status->isGood() ) { |
| 364 | $comment = wfMessage( |
| 365 | 'templatestyles-errorcomment', |
| 366 | $title->getPrefixedText(), |
| 367 | $revRecord->getId(), |
| 368 | $status->getWikiText( false, 'rawmessage' ) |
| 369 | )->text(); |
| 370 | $comment = trim( strtr( $comment, [ |
| 371 | // Use some lookalike unicode characters to avoid things that might |
| 372 | // otherwise confuse browsers. |
| 373 | '*' => '•', '-' => '‐', '<' => '⧼', '>' => '⧽', |
| 374 | ] ) ); |
| 375 | $style = "/*\n$comment\n*/\n$style"; |
| 376 | } |
| 377 | |
| 378 | // Hide the CSS from Parser::doBlockLevels |
| 379 | $marker = Parser::MARKER_PREFIX . '-templatestyles-' . |
| 380 | sprintf( '%08X', $parser->mMarkerIndex++ ) . Parser::MARKER_SUFFIX; |
| 381 | $parser->getStripState()->addNoWiki( $marker, $style ); |
| 382 | |
| 383 | // Return the inline <style>, which the Parser will wrap in a 'general' |
| 384 | // strip marker. |
| 385 | $ret = Html::inlineStyle( $marker, 'all', [ |
| 386 | 'data-mw-deduplicate' => "TemplateStyles:$cacheKey", |
| 387 | ] ); |
| 388 | $parser->extTemplateStylesCache->set( $cacheKey, $ret ); |
| 389 | return $ret; |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * Format an error in the `<templatestyles>` tag |
| 394 | * @param Parser $parser |
| 395 | * @param array $msg Arguments to wfMessage() |
| 396 | * @phan-param non-empty-array $msg |
| 397 | * @return string HTML |
| 398 | */ |
| 399 | private static function formatTagError( Parser $parser, array $msg ) { |
| 400 | $parser->addTrackingCategory( 'templatestyles-page-error-category' ); |
| 401 | return '<strong class="error">' . |
| 402 | wfMessage( ...$msg )->inContentLanguage()->parse() . |
| 403 | '</strong>'; |
| 404 | } |
| 405 | |
| 406 | } |