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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\Scribunto\Engines\LuaCommon; |
| 4 | |
| 5 | use Content; |
| 6 | use LogicException; |
| 7 | use MediaWiki\Logger\LoggerFactory; |
| 8 | use MediaWiki\MediaWikiServices; |
| 9 | use MediaWiki\Parser\ParserOutputFlags; |
| 10 | use MediaWiki\Revision\RevisionAccessException; |
| 11 | use MediaWiki\Revision\SlotRecord; |
| 12 | use MediaWiki\Title\Title; |
| 13 | |
| 14 | class TitleLibrary extends LibraryBase { |
| 15 | // Note these caches are naturally limited to |
| 16 | // $wgExpensiveParserFunctionLimit + 1 actual Title objects because any |
| 17 | // addition besides the one for the current page calls |
| 18 | // incrementExpensiveFunctionCount() |
| 19 | /** @var Title[] */ |
| 20 | private $titleCache = []; |
| 21 | /** @var (Title|null)[] */ |
| 22 | private $idCache = [ 0 => null ]; |
| 23 | |
| 24 | public function register() { |
| 25 | $lib = [ |
| 26 | 'newTitle' => [ $this, 'newTitle' ], |
| 27 | 'makeTitle' => [ $this, 'makeTitle' ], |
| 28 | 'getExpensiveData' => [ $this, 'getExpensiveData' ], |
| 29 | 'getUrl' => [ $this, 'getUrl' ], |
| 30 | 'getContent' => [ $this, 'getContent' ], |
| 31 | 'getFileInfo' => [ $this, 'getFileInfo' ], |
| 32 | 'protectionLevels' => [ $this, 'protectionLevels' ], |
| 33 | 'cascadingProtection' => [ $this, 'cascadingProtection' ], |
| 34 | 'redirectTarget' => [ $this, 'redirectTarget' ], |
| 35 | 'recordVaryFlag' => [ $this, 'recordVaryFlag' ], |
| 36 | 'getPageLangCode' => [ $this, 'getPageLangCode' ], |
| 37 | ]; |
| 38 | $title = $this->getTitle(); |
| 39 | return $this->getEngine()->registerInterface( 'mw.title.lua', $lib, [ |
| 40 | 'thisTitle' => $title ? $this->getInexpensiveTitleData( $title ) : null, |
| 41 | 'NS_MEDIA' => NS_MEDIA, |
| 42 | ] ); |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Check a namespace parameter |
| 47 | * @param string $name Function name (for errors) |
| 48 | * @param int $argIdx Argument index (for errors) |
| 49 | * @param mixed &$arg Argument |
| 50 | * @param int|null $default Default value, if $arg is null |
| 51 | */ |
| 52 | private function checkNamespace( $name, $argIdx, &$arg, $default = null ) { |
| 53 | if ( $arg === null && $default !== null ) { |
| 54 | $arg = $default; |
| 55 | } elseif ( is_numeric( $arg ) ) { |
| 56 | $arg = (int)$arg; |
| 57 | if ( !MediaWikiServices::getInstance()->getNamespaceInfo()->exists( $arg ) ) { |
| 58 | throw new LuaError( |
| 59 | "bad argument #$argIdx to '$name' (unrecognized namespace number '$arg')" |
| 60 | ); |
| 61 | } |
| 62 | } elseif ( is_string( $arg ) ) { |
| 63 | $ns = MediaWikiServices::getInstance()->getContentLanguage()->getNsIndex( $arg ); |
| 64 | if ( $ns === false ) { |
| 65 | throw new LuaError( |
| 66 | "bad argument #$argIdx to '$name' (unrecognized namespace name '$arg')" |
| 67 | ); |
| 68 | } |
| 69 | $arg = $ns; |
| 70 | } else { |
| 71 | $this->checkType( $name, $argIdx, $arg, 'namespace number or name' ); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Extract inexpensive information from a Title object for return to Lua |
| 77 | * |
| 78 | * @param Title $title Title to return |
| 79 | * @return array Lua data |
| 80 | */ |
| 81 | private function getInexpensiveTitleData( Title $title ) { |
| 82 | $ns = $title->getNamespace(); |
| 83 | $ret = [ |
| 84 | 'isCurrentTitle' => (bool)$title->equals( $this->getTitle() ), |
| 85 | 'isLocal' => (bool)$title->isLocal(), |
| 86 | 'interwiki' => $title->getInterwiki(), |
| 87 | 'namespace' => $ns, |
| 88 | 'nsText' => $title->getNsText(), |
| 89 | 'text' => $title->getText(), |
| 90 | 'fragment' => $title->getFragment(), |
| 91 | 'thePartialUrl' => $title->getPartialURL(), |
| 92 | ]; |
| 93 | if ( $ns === NS_SPECIAL ) { |
| 94 | // Core doesn't currently record special page links, but it may in the future. |
| 95 | if ( $this->getParser() && !$title->equals( $this->getTitle() ) ) { |
| 96 | $this->getParser()->getOutput()->addLink( $title ); |
| 97 | } |
| 98 | $ret['exists'] = MediaWikiServices::getInstance() |
| 99 | ->getSpecialPageFactory()->exists( $title->getDBkey() ); |
| 100 | } |
| 101 | if ( $ns !== NS_FILE && $ns !== NS_MEDIA ) { |
| 102 | $ret['file'] = false; |
| 103 | } |
| 104 | return $ret; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Extract expensive information from a Title object for return to Lua |
| 109 | * |
| 110 | * This records a link to this title in the current ParserOutput and caches the |
| 111 | * title for repeated lookups. It may call incrementExpensiveFunctionCount() if |
| 112 | * the title is not already cached. |
| 113 | * |
| 114 | * @internal |
| 115 | * @param string $text Title text |
| 116 | * @return array Lua data |
| 117 | */ |
| 118 | public function getExpensiveData( $text ) { |
| 119 | $this->checkType( 'getExpensiveData', 1, $text, 'string' ); |
| 120 | $title = Title::newFromText( $text ); |
| 121 | if ( !$title ) { |
| 122 | return [ null ]; |
| 123 | } |
| 124 | $dbKey = $title->getPrefixedDBkey(); |
| 125 | if ( isset( $this->titleCache[$dbKey] ) ) { |
| 126 | // It was already cached, so we already did the expensive work and added a link |
| 127 | $title = $this->titleCache[$dbKey]; |
| 128 | } else { |
| 129 | if ( !$title->equals( $this->getTitle() ) ) { |
| 130 | $this->incrementExpensiveFunctionCount(); |
| 131 | |
| 132 | // Record a link |
| 133 | if ( $this->getParser() ) { |
| 134 | $this->getParser()->getOutput()->addLink( $title ); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | // Cache it |
| 139 | $this->titleCache[$dbKey] = $title; |
| 140 | if ( $title->getArticleID() > 0 ) { |
| 141 | $this->idCache[$title->getArticleID()] = $title; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | $ret = [ |
| 146 | 'isRedirect' => (bool)$title->isRedirect(), |
| 147 | 'id' => $title->getArticleID(), |
| 148 | 'contentModel' => $title->getContentModel(), |
| 149 | ]; |
| 150 | if ( $title->getNamespace() === NS_SPECIAL ) { |
| 151 | $ret['exists'] = MediaWikiServices::getInstance() |
| 152 | ->getSpecialPageFactory()->exists( $title->getDBkey() ); |
| 153 | } else { |
| 154 | // bug 70495: don't just check whether the ID != 0 |
| 155 | $ret['exists'] = $title->exists(); |
| 156 | } |
| 157 | return [ $ret ]; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Handler for title.new |
| 162 | * |
| 163 | * Calls Title::newFromID or Title::newFromTitle as appropriate for the |
| 164 | * arguments. |
| 165 | * |
| 166 | * @internal |
| 167 | * @param string|int $text_or_id Title or page_id to fetch |
| 168 | * @param string|int|null $defaultNamespace Namespace name or number to use if |
| 169 | * $text_or_id doesn't override |
| 170 | * @return array Lua data |
| 171 | */ |
| 172 | public function newTitle( $text_or_id, $defaultNamespace = null ) { |
| 173 | $type = $this->getLuaType( $text_or_id ); |
| 174 | if ( $type === 'number' ) { |
| 175 | if ( array_key_exists( $text_or_id, $this->idCache ) ) { |
| 176 | $title = $this->idCache[$text_or_id]; |
| 177 | } else { |
| 178 | $this->incrementExpensiveFunctionCount(); |
| 179 | $title = Title::newFromID( $text_or_id ); |
| 180 | $this->idCache[$text_or_id] = $title; |
| 181 | |
| 182 | // Record a link |
| 183 | if ( $title && $this->getParser() && !$title->equals( $this->getTitle() ) ) { |
| 184 | $this->getParser()->getOutput()->addLink( $title ); |
| 185 | } |
| 186 | } |
| 187 | if ( $title ) { |
| 188 | $this->titleCache[$title->getPrefixedDBkey()] = $title; |
| 189 | } else { |
| 190 | return [ null ]; |
| 191 | } |
| 192 | } elseif ( $type === 'string' ) { |
| 193 | $this->checkNamespace( 'title.new', 2, $defaultNamespace, NS_MAIN ); |
| 194 | |
| 195 | // Note this just fills in the given fields, it doesn't fetch from |
| 196 | // the page table. |
| 197 | $title = Title::newFromText( $text_or_id, $defaultNamespace ); |
| 198 | if ( !$title ) { |
| 199 | return [ null ]; |
| 200 | } |
| 201 | } else { |
| 202 | $this->checkType( 'title.new', 1, $text_or_id, 'number or string' ); |
| 203 | throw new LogicException( 'checkType above should have failed' ); |
| 204 | } |
| 205 | |
| 206 | return [ $this->getInexpensiveTitleData( $title ) ]; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Handler for title.makeTitle |
| 211 | * |
| 212 | * Calls Title::makeTitleSafe. |
| 213 | * |
| 214 | * @internal |
| 215 | * @param string|int $ns Namespace |
| 216 | * @param string $text Title text |
| 217 | * @param string|null $fragment URI fragment |
| 218 | * @param string|null $interwiki Interwiki code |
| 219 | * @return array Lua data |
| 220 | */ |
| 221 | public function makeTitle( $ns, $text, $fragment = null, $interwiki = null ) { |
| 222 | $this->checkNamespace( 'makeTitle', 1, $ns ); |
| 223 | $this->checkType( 'makeTitle', 2, $text, 'string' ); |
| 224 | $this->checkTypeOptional( 'makeTitle', 3, $fragment, 'string', '' ); |
| 225 | $this->checkTypeOptional( 'makeTitle', 4, $interwiki, 'string', '' ); |
| 226 | |
| 227 | // Note this just fills in the given fields, it doesn't fetch from the |
| 228 | // page table. |
| 229 | $title = Title::makeTitleSafe( $ns, $text, $fragment, $interwiki ); |
| 230 | if ( !$title ) { |
| 231 | return [ null ]; |
| 232 | } |
| 233 | |
| 234 | return [ $this->getInexpensiveTitleData( $title ) ]; |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * Get a URL referring to this title |
| 239 | * @internal |
| 240 | * @param string $text Title text. |
| 241 | * @param string $which 'fullUrl', 'localUrl', or 'canonicalUrl' |
| 242 | * @param string|array|null $query Query string or query string data. |
| 243 | * @param string|null $proto 'http', 'https', 'relative', or 'canonical' |
| 244 | * @return array |
| 245 | */ |
| 246 | public function getUrl( $text, $which, $query = null, $proto = null ) { |
| 247 | static $protoMap = [ |
| 248 | 'http' => PROTO_HTTP, |
| 249 | 'https' => PROTO_HTTPS, |
| 250 | 'relative' => PROTO_RELATIVE, |
| 251 | 'canonical' => PROTO_CANONICAL, |
| 252 | ]; |
| 253 | |
| 254 | $this->checkType( 'getUrl', 1, $text, 'string' ); |
| 255 | $this->checkType( 'getUrl', 2, $which, 'string' ); |
| 256 | if ( !in_array( $which, [ 'fullUrl', 'localUrl', 'canonicalUrl' ], true ) ) { |
| 257 | $this->checkType( 'getUrl', 2, $which, "'fullUrl', 'localUrl', or 'canonicalUrl'" ); |
| 258 | } |
| 259 | |
| 260 | // May call the following Title methods: |
| 261 | // getFullUrl, getLocalUrl, getCanonicalUrl |
| 262 | $func = "get" . ucfirst( $which ); |
| 263 | |
| 264 | $args = [ $query, false ]; |
| 265 | if ( !is_string( $query ) && !is_array( $query ) ) { |
| 266 | $this->checkTypeOptional( $which, 1, $query, 'table or string', '' ); |
| 267 | } |
| 268 | if ( $which === 'fullUrl' ) { |
| 269 | $this->checkTypeOptional( $which, 2, $proto, 'string', 'relative' ); |
| 270 | if ( !isset( $protoMap[$proto] ) ) { |
| 271 | $this->checkType( $which, 2, $proto, "'http', 'https', 'relative', or 'canonical'" ); |
| 272 | } |
| 273 | $args[] = $protoMap[$proto]; |
| 274 | } |
| 275 | |
| 276 | $title = Title::newFromText( $text ); |
| 277 | if ( !$title ) { |
| 278 | return [ null ]; |
| 279 | } |
| 280 | return [ $title->$func( ...$args ) ]; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Utility to get a Content object from a title |
| 285 | * |
| 286 | * The title is counted as a transclusion. |
| 287 | * |
| 288 | * @param string $text Title text |
| 289 | * @return Content|null The Content object of the title, null if missing |
| 290 | */ |
| 291 | private function getContentInternal( $text ) { |
| 292 | $title = Title::newFromText( $text ); |
| 293 | if ( !$title || $title->isExternal() ) { |
| 294 | return null; |
| 295 | } |
| 296 | |
| 297 | // Record in templatelinks, so edits cause the page to be refreshed |
| 298 | $this->getParser()->getOutput()->addTemplate( |
| 299 | $title, $title->getArticleID(), $title->getLatestRevID() |
| 300 | ); |
| 301 | |
| 302 | $rev = $this->getParser()->fetchCurrentRevisionRecordOfTitle( $title ); |
| 303 | |
| 304 | if ( $title->equals( $this->getTitle() ) ) { |
| 305 | $parserOutput = $this->getParser()->getOutput(); |
| 306 | $parserOutput->setOutputFlag( ParserOutputFlags::VARY_REVISION_SHA1 ); |
| 307 | $parserOutput->setRevisionUsedSha1Base36( $rev ? $rev->getSha1() : '' ); |
| 308 | wfDebug( __METHOD__ . ": set vary-revision-sha1 for '$title'" ); |
| 309 | } |
| 310 | |
| 311 | if ( !$rev ) { |
| 312 | return null; |
| 313 | } |
| 314 | |
| 315 | try { |
| 316 | $content = $rev->getContent( SlotRecord::MAIN ); |
| 317 | } catch ( RevisionAccessException $ex ) { |
| 318 | $logger = LoggerFactory::getInstance( 'Scribunto' ); |
| 319 | $logger->warning( |
| 320 | __METHOD__ . ': Unable to transclude revision content', |
| 321 | [ 'exception' => $ex ] |
| 322 | ); |
| 323 | $content = null; |
| 324 | } |
| 325 | return $content; |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * Handler for getContent |
| 330 | * @internal |
| 331 | * @param string $text |
| 332 | * @return string[]|null[] |
| 333 | */ |
| 334 | public function getContent( $text ) { |
| 335 | $this->checkType( 'getContent', 1, $text, 'string' ); |
| 336 | $content = $this->getContentInternal( $text ); |
| 337 | return [ $content ? $content->serialize() : null ]; |
| 338 | } |
| 339 | |
| 340 | /** |
| 341 | * Handler for getFileInfo |
| 342 | * @internal |
| 343 | * @param string $text |
| 344 | * @return array |
| 345 | */ |
| 346 | public function getFileInfo( $text ) { |
| 347 | $this->checkType( 'getFileInfo', 1, $text, 'string' ); |
| 348 | $title = Title::newFromText( $text ); |
| 349 | if ( !$title ) { |
| 350 | return [ false ]; |
| 351 | } |
| 352 | $ns = $title->getNamespace(); |
| 353 | if ( $ns !== NS_FILE && $ns !== NS_MEDIA ) { |
| 354 | return [ false ]; |
| 355 | } |
| 356 | |
| 357 | $this->incrementExpensiveFunctionCount(); |
| 358 | $file = MediaWikiServices::getInstance()->getRepoGroup()->findFile( $title ); |
| 359 | if ( !$file ) { |
| 360 | return [ [ 'exists' => false ] ]; |
| 361 | } |
| 362 | $this->getParser()->getOutput()->addImage( |
| 363 | $file->getName(), $file->getTimestamp(), $file->getSha1() |
| 364 | ); |
| 365 | if ( !$file->exists() ) { |
| 366 | return [ [ 'exists' => false ] ]; |
| 367 | } |
| 368 | $pageCount = $file->pageCount(); |
| 369 | if ( $pageCount === false ) { |
| 370 | $pages = null; |
| 371 | } else { |
| 372 | $pages = []; |
| 373 | for ( $i = 1; $i <= $pageCount; ++$i ) { |
| 374 | $pages[$i] = [ |
| 375 | 'width' => $file->getWidth( $i ), |
| 376 | 'height' => $file->getHeight( $i ) |
| 377 | ]; |
| 378 | } |
| 379 | } |
| 380 | return [ [ |
| 381 | 'exists' => true, |
| 382 | 'width' => $file->getWidth(), |
| 383 | 'height' => $file->getHeight(), |
| 384 | 'mimeType' => $file->getMimeType(), |
| 385 | 'length' => $file->getLength(), |
| 386 | 'size' => $file->getSize(), |
| 387 | 'pages' => $pages |
| 388 | ] ]; |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Renumber an array for return to Lua |
| 393 | * @param array $arr |
| 394 | * @return array |
| 395 | */ |
| 396 | private static function makeArrayOneBased( $arr ) { |
| 397 | if ( !$arr ) { |
| 398 | return $arr; |
| 399 | } |
| 400 | return array_combine( range( 1, count( $arr ) ), array_values( $arr ) ); |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * Handler for protectionLevels |
| 405 | * @internal |
| 406 | * @param string $text |
| 407 | * @return array |
| 408 | */ |
| 409 | public function protectionLevels( $text ) { |
| 410 | $this->checkType( 'protectionLevels', 1, $text, 'string' ); |
| 411 | $title = Title::newFromText( $text ); |
| 412 | if ( !$title ) { |
| 413 | return [ null ]; |
| 414 | } |
| 415 | |
| 416 | $restrictionStore = MediaWikiServices::getInstance()->getRestrictionStore(); |
| 417 | |
| 418 | if ( !$restrictionStore->areRestrictionsLoaded( $title ) ) { |
| 419 | $this->incrementExpensiveFunctionCount(); |
| 420 | } |
| 421 | return [ array_map( |
| 422 | [ self::class, 'makeArrayOneBased' ], |
| 423 | $restrictionStore->getAllRestrictions( $title ) |
| 424 | ) ]; |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * Handler for cascadingProtection |
| 429 | * @internal |
| 430 | * @param string $text |
| 431 | * @return array |
| 432 | */ |
| 433 | public function cascadingProtection( $text ) { |
| 434 | $this->checkType( 'cascadingProtection', 1, $text, 'string' ); |
| 435 | $title = Title::newFromText( $text ); |
| 436 | if ( !$title ) { |
| 437 | return [ null ]; |
| 438 | } |
| 439 | |
| 440 | $restrictionStore = MediaWikiServices::getInstance()->getRestrictionStore(); |
| 441 | $titleFormatter = MediaWikiServices::getInstance()->getTitleFormatter(); |
| 442 | |
| 443 | if ( !$restrictionStore->areCascadeProtectionSourcesLoaded( $title ) ) { |
| 444 | $this->incrementExpensiveFunctionCount(); |
| 445 | } |
| 446 | |
| 447 | [ $sources, $restrictions ] = $restrictionStore->getCascadeProtectionSources( $title ); |
| 448 | |
| 449 | return [ [ |
| 450 | 'sources' => self::makeArrayOneBased( array_map( |
| 451 | static function ( $t ) use ( $titleFormatter ) { |
| 452 | return $titleFormatter->getPrefixedText( $t ); |
| 453 | }, |
| 454 | $sources ) ), |
| 455 | 'restrictions' => array_map( |
| 456 | [ self::class, 'makeArrayOneBased' ], |
| 457 | $restrictions |
| 458 | ) |
| 459 | ] ]; |
| 460 | } |
| 461 | |
| 462 | /** |
| 463 | * Handler for redirectTarget |
| 464 | * @internal |
| 465 | * @param string $text |
| 466 | * @return string[]|null[] |
| 467 | */ |
| 468 | public function redirectTarget( $text ) { |
| 469 | $this->checkType( 'redirectTarget', 1, $text, 'string' ); |
| 470 | $content = $this->getContentInternal( $text ); |
| 471 | $redirTitle = $content ? $content->getRedirectTarget() : null; |
| 472 | return [ $redirTitle ? $this->getInexpensiveTitleData( $redirTitle ) : null ]; |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * Record a ParserOutput flag when the current title is accessed |
| 477 | * @internal |
| 478 | * @param string $text |
| 479 | * @param string $flag |
| 480 | * @return array |
| 481 | */ |
| 482 | public function recordVaryFlag( $text, $flag ) { |
| 483 | $this->checkType( 'recordVaryFlag', 1, $text, 'string' ); |
| 484 | $this->checkType( 'recordVaryFlag', 2, $flag, 'string' ); |
| 485 | $title = Title::newFromText( $text ); |
| 486 | if ( $title && $title->equals( $this->getTitle() ) ) { |
| 487 | // XXX note that we don't check this against the values defined |
| 488 | // in ParserOutputFlags |
| 489 | $this->getParser()->getOutput()->setOutputFlag( $flag ); |
| 490 | } |
| 491 | return []; |
| 492 | } |
| 493 | |
| 494 | /** |
| 495 | * Handler for getPageLangCode |
| 496 | * @internal |
| 497 | * @param string $text Title text. |
| 498 | * @return array<?string> |
| 499 | */ |
| 500 | public function getPageLangCode( $text ) { |
| 501 | $title = Title::newFromText( $text ); |
| 502 | if ( $title ) { |
| 503 | // If the page language is coming from the page record, we've |
| 504 | // probably accounted for the cost of reading the title from |
| 505 | // the DB already. However, a PageContentLanguage hook handler |
| 506 | // might get invoked here, and who knows how much that costs. |
| 507 | // Be safe and increment here, even though this could over-count. |
| 508 | $this->incrementExpensiveFunctionCount(); |
| 509 | return [ $title->getPageLanguage()->getCode() ]; |
| 510 | } |
| 511 | return [ null ]; |
| 512 | } |
| 513 | } |