includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Revision\MutableRevisionRecord;
  24 use MediaWiki\Revision\RevisionRecord;
  25 use MediaWiki\Revision\SlotRecord;
  26
  27 /**
  28  * Class for viewing MediaWiki article and history.
  29  *
  30  * This maintains WikiPage functions for backwards compatibility.
  31  *
  32  * @todo Move and rewrite code to an Action class
  33  *
  34  * See design.txt for an overview.
  35  * Note: edit user interface and cache support functions have been
  36  * moved to separate EditPage and HTMLFileCache classes.
  37  */
  38 class Article implements Page {
  39         /**
  40          * @var IContextSource|null The context this Article is executed in.
  41          * If null, RequestContext::getMain() is used.
  42          */
  43         protected $mContext;
  44
  45         /** @var WikiPage|null The WikiPage object of this instance */
  46         protected $mPage;
  47
  48         /**
  49          * @var ParserOptions|null ParserOptions object for $wgUser articles.
  50          * Initialized by getParserOptions by calling $this->mPage->makeParserOptions().
  51          */
  52         public $mParserOptions;
  53
  54         /**
  55          * @var Content|null Content of the main slot of $this->mRevision.
  56          * @note This variable is read only, setting it has no effect.
  57          *       Extensions that wish to override the output of Article::view should use a hook.
  58          * @todo MCR: Remove in 1.33
  59          * @deprecated since 1.32
  60          * @since 1.21
  61          */
  62         public $mContentObject;
  63
  64         /**
  65          * @var bool Is the target revision loaded? Set by fetchRevisionRecord().
  66          *
  67          * @deprecated since 1.32. Whether content has been loaded should not be relevant to
  68          * code outside this class.
  69          */
  70         public $mContentLoaded = false;
  71
  72         /**
  73          * @var int|null The oldid of the article that was requested to be shown,
  74          * 0 for the current revision.
  75          * @see $mRevIdFetched
  76          */
  77         public $mOldId;
  78
  79         /** @var Title|null Title from which we were redirected here, if any. */
  80         public $mRedirectedFrom = null;
  81
  82         /** @var string|bool URL to redirect to or false if none */
  83         public $mRedirectUrl = false;
  84
  85         /**
  86          * @var int Revision ID of revision that was loaded.
  87          * @see $mOldId
  88          * @deprecated since 1.32, use getRevIdFetched() instead.
  89          */
  90         public $mRevIdFetched = 0;
  91
  92         /**
  93          * @var Status|null represents the outcome of fetchRevisionRecord().
  94          * $fetchResult->value is the RevisionRecord object, if the operation was successful.
  95          *
  96          * The information in $fetchResult is duplicated by the following deprecated public fields:
  97          * $mRevIdFetched, $mContentLoaded. $mRevision (and $mContentObject) also typically duplicate
  98          * information of the loaded revision, but may be overwritten by extensions or due to errors.
  99          */
 100         private $fetchResult = null;
 101
 102         /**
 103          * @var Revision|null Revision to be shown. Initialized by getOldIDFromRequest()
 104          * or fetchContentObject(). Normally loaded from the database, but may be replaced
 105          * by an extension, or be a fake representing an error message or some such.
 106          * While the output of Article::view is typically based on this revision,
 107          * it may be overwritten by error messages or replaced by extensions.
 108          */
 109         public $mRevision = null;
 110
 111         /**
 112          * @var ParserOutput|null|false The ParserOutput generated for viewing the page,
 113          * initialized by view(). If no ParserOutput could be generated, this is set to false.
 114          * @deprecated since 1.32
 115          */
 116         public $mParserOutput = null;
 117
 118         /**
 119          * @var bool Whether render() was called. With the way subclasses work
 120          * here, there doesn't seem to be any other way to stop calling
 121          * OutputPage::enableSectionEditLinks() and still have it work as it did before.
 122          */
 123         private $disableSectionEditForRender = false;
 124
 125         /**
 126          * Constructor and clear the article
 127          * @param Title $title Reference to a Title object.
 128          * @param int|null $oldId Revision ID, null to fetch from request, zero for current
 129          */
 130         public function __construct( Title $title, $oldId = null ) {
 131                 $this->mOldId = $oldId;
 132                 $this->mPage = $this->newPage( $title );
 133         }
 134
 135         /**
 136          * @param Title $title
 137          * @return WikiPage
 138          */
 139         protected function newPage( Title $title ) {
 140                 return new WikiPage( $title );
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          * @param int $id Article ID to load
 146          * @return Article|null
 147          */
 148         public static function newFromID( $id ) {
 149                 $t = Title::newFromID( $id );
 150                 return $t == null ? null : new static( $t );
 151         }
 152
 153         /**
 154          * Create an Article object of the appropriate class for the given page.
 155          *
 156          * @param Title $title
 157          * @param IContextSource $context
 158          * @return Article
 159          */
 160         public static function newFromTitle( $title, IContextSource $context ) {
 161                 if ( NS_MEDIA == $title->getNamespace() ) {
 162                         // XXX: This should not be here, but where should it go?
 163                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 164                 }
 165
 166                 $page = null;
 167                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 168                 if ( !$page ) {
 169                         switch ( $title->getNamespace() ) {
 170                                 case NS_FILE:
 171                                         $page = new ImagePage( $title );
 172                                         break;
 173                                 case NS_CATEGORY:
 174                                         $page = new CategoryPage( $title );
 175                                         break;
 176                                 default:
 177                                         $page = new Article( $title );
 178                         }
 179                 }
 180                 $page->setContext( $context );
 181
 182                 return $page;
 183         }
 184
 185         /**
 186          * Create an Article object of the appropriate class for the given page.
 187          *
 188          * @param WikiPage $page
 189          * @param IContextSource $context
 190          * @return Article
 191          */
 192         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 193                 $article = self::newFromTitle( $page->getTitle(), $context );
 194                 $article->mPage = $page; // override to keep process cached vars
 195                 return $article;
 196         }
 197
 198         /**
 199          * Get the page this view was redirected from
 200          * @return Title|null
 201          * @since 1.28
 202          */
 203         public function getRedirectedFrom() {
 204                 return $this->mRedirectedFrom;
 205         }
 206
 207         /**
 208          * Tell the page view functions that this view was redirected
 209          * from another page on the wiki.
 210          * @param Title $from
 211          */
 212         public function setRedirectedFrom( Title $from ) {
 213                 $this->mRedirectedFrom = $from;
 214         }
 215
 216         /**
 217          * Get the title object of the article
 218          *
 219          * @return Title Title object of this page
 220          */
 221         public function getTitle() {
 222                 return $this->mPage->getTitle();
 223         }
 224
 225         /**
 226          * Get the WikiPage object of this instance
 227          *
 228          * @since 1.19
 229          * @return WikiPage
 230          */
 231         public function getPage() {
 232                 return $this->mPage;
 233         }
 234
 235         /**
 236          * Clear the object
 237          */
 238         public function clear() {
 239                 $this->mContentLoaded = false;
 240
 241                 $this->mRedirectedFrom = null; # Title object if set
 242                 $this->mRevIdFetched = 0;
 243                 $this->mRedirectUrl = false;
 244                 $this->mRevision = null;
 245                 $this->mContentObject = null;
 246                 $this->fetchResult = null;
 247
 248                 // TODO hard-deprecate direct access to public fields
 249
 250                 $this->mPage->clear();
 251         }
 252
 253         /**
 254          * Returns a Content object representing the pages effective display content,
 255          * not necessarily the revision's content!
 256          *
 257          * Note that getContent does not follow redirects anymore.
 258          * If you need to fetch redirectable content easily, try
 259          * the shortcut in WikiPage::getRedirectTarget()
 260          *
 261          * This function has side effects! Do not use this function if you
 262          * only want the real revision text if any.
 263          *
 264          * @deprecated since 1.32, use getRevisionFetched() or fetchRevisionRecord() instead.
 265          *
 266          * @return Content
 267          *
 268          * @since 1.21
 269          */
 270         protected function getContentObject() {
 271                 if ( $this->mPage->getId() === 0 ) {
 272                         $content = $this->getSubstituteContent();
 273                 } else {
 274                         $this->fetchContentObject();
 275                         $content = $this->mContentObject;
 276                 }
 277
 278                 return $content;
 279         }
 280
 281         /**
 282          * Returns Content object to use when the page does not exist.
 283          *
 284          * @return Content
 285          */
 286         private function getSubstituteContent() {
 287                 # If this is a MediaWiki:x message, then load the messages
 288                 # and return the message value for x.
 289                 if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 290                         $text = $this->getTitle()->getDefaultMessageText();
 291                         if ( $text === false ) {
 292                                 $text = '';
 293                         }
 294
 295                         $content = ContentHandler::makeContent( $text, $this->getTitle() );
 296                 } else {
 297                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 298                         $content = new MessageContent( $message, null, 'parsemag' );
 299                 }
 300
 301                 return $content;
 302         }
 303
 304         /**
 305          * Returns ParserOutput to use when a page does not exist. In some cases, we still want to show
 306          * "virtual" content, e.g. in the MediaWiki namespace, or in the File namespace for non-local
 307          * files.
 308          *
 309          * @param ParserOptions $options
 310          *
 311          * @return ParserOutput
 312          */
 313         protected function getEmptyPageParserOutput( ParserOptions $options ) {
 314                 $content = $this->getSubstituteContent();
 315
 316                 return $content->getParserOutput( $this->getTitle(), 0, $options );
 317         }
 318
 319         /**
 320          * @see getOldIDFromRequest()
 321          * @see getRevIdFetched()
 322          *
 323          * @return int The oldid of the article that is was requested in the constructor or via the
 324          *         context's WebRequest.
 325          */
 326         public function getOldID() {
 327                 if ( is_null( $this->mOldId ) ) {
 328                         $this->mOldId = $this->getOldIDFromRequest();
 329                 }
 330
 331                 return $this->mOldId;
 332         }
 333
 334         /**
 335          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 336          *
 337          * @return int The old id for the request
 338          */
 339         public function getOldIDFromRequest() {
 340                 $this->mRedirectUrl = false;
 341
 342                 $request = $this->getContext()->getRequest();
 343                 $oldid = $request->getIntOrNull( 'oldid' );
 344
 345                 if ( $oldid === null ) {
 346                         return 0;
 347                 }
 348
 349                 if ( $oldid !== 0 ) {
 350                         # Load the given revision and check whether the page is another one.
 351                         # In that case, update this instance to reflect the change.
 352                         if ( $oldid === $this->mPage->getLatest() ) {
 353                                 $this->mRevision = $this->mPage->getRevision();
 354                         } else {
 355                                 $this->mRevision = Revision::newFromId( $oldid );
 356                                 if ( $this->mRevision !== null ) {
 357                                         // Revision title doesn't match the page title given?
 358                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 359                                                 $function = get_class( $this->mPage ) . '::newFromID';
 360                                                 $this->mPage = $function( $this->mRevision->getPage() );
 361                                         }
 362                                 }
 363                         }
 364                 }
 365
 366                 if ( $request->getVal( 'direction' ) == 'next' ) {
 367                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 368                         if ( $nextid ) {
 369                                 $oldid = $nextid;
 370                                 $this->mRevision = null;
 371                         } else {
 372                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 373                         }
 374                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 375                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 376                         if ( $previd ) {
 377                                 $oldid = $previd;
 378                                 $this->mRevision = null;
 379                         }
 380                 }
 381
 382                 $this->mRevIdFetched = $this->mRevision ? $this->mRevision->getId() : 0;
 383
 384                 return $oldid;
 385         }
 386
 387         /**
 388          * Get text content object
 389          * Does *NOT* follow redirects.
 390          * @todo When is this null?
 391          * @deprecated since 1.32, use fetchRevisionRecord() instead.
 392          *
 393          * @note Code that wants to retrieve page content from the database should
 394          * use WikiPage::getContent().
 395          *
 396          * @return Content|null|bool
 397          *
 398          * @since 1.21
 399          */
 400         protected function fetchContentObject() {
 401                 if ( !$this->mContentLoaded ) {
 402                         $this->fetchRevisionRecord();
 403                 }
 404
 405                 return $this->mContentObject;
 406         }
 407
 408         /**
 409          * Fetches the revision to work on.
 410          * The revision is typically loaded from the database, but may also be a fake representing
 411          * an error message or content supplied by an extension. Refer to $this->fetchResult for
 412          * the revision actually loaded from the database, and any errors encountered while doing
 413          * that.
 414          *
 415          * @return RevisionRecord|null
 416          */
 417         protected function fetchRevisionRecord() {
 418                 if ( $this->fetchResult ) {
 419                         return $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 420                 }
 421
 422                 $this->mContentLoaded = true;
 423                 $this->mContentObject = null;
 424
 425                 $oldid = $this->getOldID();
 426
 427                 // $this->mRevision might already be fetched by getOldIDFromRequest()
 428                 if ( !$this->mRevision ) {
 429                         if ( !$oldid ) {
 430                                 $this->mRevision = $this->mPage->getRevision();
 431
 432                                 if ( !$this->mRevision ) {
 433                                         wfDebug( __METHOD__ . " failed to find page data for title " .
 434                                                 $this->getTitle()->getPrefixedText() . "\n" );
 435
 436                                         // Just for sanity, output for this case is done by showMissingArticle().
 437                                         $this->fetchResult = Status::newFatal( 'noarticletext' );
 438                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 439                                         return null;
 440                                 }
 441                         } else {
 442                                 $this->mRevision = Revision::newFromId( $oldid );
 443
 444                                 if ( !$this->mRevision ) {
 445                                         wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid\n" );
 446
 447                                         $this->fetchResult = Status::newFatal( 'missing-revision', $oldid );
 448                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 449                                         return null;
 450                                 }
 451                         }
 452                 }
 453
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455                 $this->fetchResult = Status::newGood( $this->mRevision );
 456
 457                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $this->getContext()->getUser() ) ) {
 458                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 459                                 $this->mRevision->getId() . "\n" );
 460
 461                         // Just for sanity, output for this case is done by showDeletedRevisionHeader().
 462                         $this->fetchResult = Status::newFatal( 'rev-deleted-text-permission' );
 463                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 464                         return null;
 465                 }
 466
 467                 if ( Hooks::isRegistered( 'ArticleAfterFetchContentObject' ) ) {
 468                         $contentObject = $this->mRevision->getContent(
 469                                 Revision::FOR_THIS_USER,
 470                                 $this->getContext()->getUser()
 471                         );
 472
 473                         $hookContentObject = $contentObject;
 474
 475                                 // Avoid PHP 7.1 warning of passing $this by reference
 476                         $articlePage = $this;
 477
 478                         Hooks::run(
 479                                 'ArticleAfterFetchContentObject',
 480                                 [ &$articlePage, &$hookContentObject ],
 481                                 '1.32'
 482                         );
 483
 484                         if ( $hookContentObject !== $contentObject ) {
 485                                 // A hook handler is trying to override the content
 486                                 $this->applyContentOverride( $hookContentObject );
 487                         }
 488                 }
 489
 490                 // For B/C only
 491                 $this->mContentObject = $this->mRevision->getContent(
 492                         Revision::FOR_THIS_USER,
 493                         $this->getContext()->getUser()
 494                 );
 495
 496                 return $this->mRevision->getRevisionRecord();
 497         }
 498
 499         /**
 500          * Returns a Content object representing any error in $this->fetchContent, or null
 501          * if there is no such error.
 502          *
 503          * @return Content|null
 504          */
 505         private function makeFetchErrorContent() {
 506                 if ( !$this->fetchResult || $this->fetchResult->isOK() ) {
 507                         return null;
 508                 }
 509
 510                 return new MessageContent( $this->fetchResult->getMessage() );
 511         }
 512
 513         /**
 514          * Applies a content override by constructing a fake Revision object and assigning
 515          * it to mRevision. The fake revision will not have a user, timestamp or summary set.
 516          *
 517          * This mechanism exists mainly to accommodate extensions that use the
 518          * ArticleAfterFetchContentObject. Once that hook has been removed, there should no longer
 519          * be a need for a fake revision object. fetchRevisionRecord() presently also uses this mechanism
 520          * to report errors, but that could be changed to use $this->fetchResult instead.
 521          *
 522          * @param Content $override Content to be used instead of the actual page content,
 523          *        coming from an extension or representing an error message.
 524          */
 525         private function applyContentOverride( Content $override ) {
 526                 // Construct a fake revision
 527                 $rev = new MutableRevisionRecord( $this->getTitle() );
 528                 $rev->setContent( SlotRecord::MAIN, $override );
 529
 530                 $this->mRevision = new Revision( $rev );
 531
 532                 // For B/C only
 533                 $this->mContentObject = $override;
 534         }
 535
 536         /**
 537          * Returns true if the currently-referenced revision is the current edit
 538          * to this page (and it exists).
 539          * @return bool
 540          */
 541         public function isCurrent() {
 542                 # If no oldid, this is the current version.
 543                 if ( $this->getOldID() == 0 ) {
 544                         return true;
 545                 }
 546
 547                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 548         }
 549
 550         /**
 551          * Get the fetched Revision object depending on request parameters or null
 552          * on failure. The revision returned may be a fake representing an error message or
 553          * wrapping content supplied by an extension. Refer to $this->fetchResult for the
 554          * revision actually loaded from the database.
 555          *
 556          * @since 1.19
 557          * @return Revision|null
 558          */
 559         public function getRevisionFetched() {
 560                 $this->fetchRevisionRecord();
 561
 562                 if ( $this->fetchResult->isOK() ) {
 563                         return $this->mRevision;
 564                 }
 565         }
 566
 567         /**
 568          * Use this to fetch the rev ID used on page views
 569          *
 570          * Before fetchRevisionRecord was called, this returns the page's latest revision,
 571          * regardless of what getOldID() returns.
 572          *
 573          * @return int Revision ID of last article revision
 574          */
 575         public function getRevIdFetched() {
 576                 if ( $this->fetchResult && $this->fetchResult->isOK() ) {
 577                         return $this->fetchResult->value->getId();
 578                 } else {
 579                         return $this->mPage->getLatest();
 580                 }
 581         }
 582
 583         /**
 584          * This is the default action of the index.php entry point: just view the
 585          * page of the given title.
 586          */
 587         public function view() {
 588                 global $wgUseFileCache, $wgDebugToolbar;
 589
 590                 # Get variables from query string
 591                 # As side effect this will load the revision and update the title
 592                 # in a revision ID is passed in the request, so this should remain
 593                 # the first call of this method even if $oldid is used way below.
 594                 $oldid = $this->getOldID();
 595
 596                 $user = $this->getContext()->getUser();
 597                 # Another whitelist check in case getOldID() is altering the title
 598                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 599                 if ( count( $permErrors ) ) {
 600                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 601                         throw new PermissionsError( 'read', $permErrors );
 602                 }
 603
 604                 $outputPage = $this->getContext()->getOutput();
 605                 # getOldID() may as well want us to redirect somewhere else
 606                 if ( $this->mRedirectUrl ) {
 607                         $outputPage->redirect( $this->mRedirectUrl );
 608                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 609
 610                         return;
 611                 }
 612
 613                 # If we got diff in the query, we want to see a diff page instead of the article.
 614                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 615                         wfDebug( __METHOD__ . ": showing diff page\n" );
 616                         $this->showDiffPage();
 617
 618                         return;
 619                 }
 620
 621                 # Set page title (may be overridden by DISPLAYTITLE)
 622                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 623
 624                 $outputPage->setArticleFlag( true );
 625                 # Allow frames by default
 626                 $outputPage->allowClickjacking();
 627
 628                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 629
 630                 $parserOptions = $this->getParserOptions();
 631                 $poOptions = [];
 632                 # Render printable version, use printable version cache
 633                 if ( $outputPage->isPrintable() ) {
 634                         $parserOptions->setIsPrintable( true );
 635                         $poOptions['enableSectionEditLinks'] = false;
 636                 } elseif ( $this->disableSectionEditForRender
 637                         || !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user )
 638                 ) {
 639                         $poOptions['enableSectionEditLinks'] = false;
 640                 }
 641
 642                 # Try client and file cache
 643                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 644                         # Try to stream the output from file cache
 645                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 646                                 wfDebug( __METHOD__ . ": done file cache\n" );
 647                                 # tell wgOut that output is taken care of
 648                                 $outputPage->disable();
 649                                 $this->mPage->doViewUpdates( $user, $oldid );
 650
 651                                 return;
 652                         }
 653                 }
 654
 655                 # Should the parser cache be used?
 656                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 657                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 658                 if ( $user->getStubThreshold() ) {
 659                         MediaWikiServices::getInstance()->getStatsdDataFactory()->increment( 'pcache_miss_stub' );
 660                 }
 661
 662                 $this->showRedirectedFromHeader();
 663                 $this->showNamespaceHeader();
 664
 665                 # Iterate through the possible ways of constructing the output text.
 666                 # Keep going until $outputDone is set, or we run out of things to do.
 667                 $pass = 0;
 668                 $outputDone = false;
 669                 $this->mParserOutput = false;
 670
 671                 while ( !$outputDone && ++$pass ) {
 672                         switch ( $pass ) {
 673                                 case 1:
 674                                         // Avoid PHP 7.1 warning of passing $this by reference
 675                                         $articlePage = $this;
 676                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 677                                         break;
 678                                 case 2:
 679                                         # Early abort if the page doesn't exist
 680                                         if ( !$this->mPage->exists() ) {
 681                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 682                                                 $this->showMissingArticle();
 683                                                 $this->mPage->doViewUpdates( $user );
 684                                                 return;
 685                                         }
 686
 687                                         # Try the parser cache
 688                                         if ( $useParserCache ) {
 689                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 690
 691                                                 if ( $this->mParserOutput !== false ) {
 692                                                         if ( $oldid ) {
 693                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 694                                                                 $this->setOldSubtitle( $oldid );
 695                                                         } else {
 696                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 697                                                         }
 698                                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 699                                                         # Ensure that UI elements requiring revision ID have
 700                                                         # the correct version information.
 701                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 702                                                         # Preload timestamp to avoid a DB hit
 703                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 704                                                         if ( $cachedTimestamp !== null ) {
 705                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 706                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 707                                                         }
 708                                                         $outputDone = true;
 709                                                 }
 710                                         }
 711                                         break;
 712                                 case 3:
 713                                         # Are we looking at an old revision
 714                                         $rev = $this->fetchRevisionRecord();
 715                                         if ( $oldid && $this->fetchResult->isOK() ) {
 716                                                 $this->setOldSubtitle( $oldid );
 717
 718                                                 if ( !$this->showDeletedRevisionHeader() ) {
 719                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 720                                                         return;
 721                                                 }
 722                                         }
 723
 724                                         # Ensure that UI elements requiring revision ID have
 725                                         # the correct version information.
 726                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 727                                         # Preload timestamp to avoid a DB hit
 728                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 729
 730                                         # Pages containing custom CSS or JavaScript get special treatment
 731                                         if ( $this->getTitle()->isSiteConfigPage() || $this->getTitle()->isUserConfigPage() ) {
 732                                                 $dir = $this->getContext()->getLanguage()->getDir();
 733                                                 $lang = $this->getContext()->getLanguage()->getHtmlCode();
 734
 735                                                 $outputPage->wrapWikiMsg(
 736                                                         "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 737                                                         'clearyourcache'
 738                                                 );
 739                                         } elseif ( !Hooks::run( 'ArticleRevisionViewCustom', [
 740                                                         $rev,
 741                                                         $this->getTitle(),
 742                                                         $oldid,
 743                                                         $outputPage,
 744                                                 ] )
 745                                         ) {
 746                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 747                                                 // Allow extensions do their own custom view for certain pages
 748                                                 $outputDone = true;
 749                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 750                                                 [ $this->fetchContentObject(), $this->getTitle(), $outputPage ], '1.32' )
 751                                         ) {
 752                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 753                                                 // Allow extensions do their own custom view for certain pages
 754                                                 $outputDone = true;
 755                                         }
 756                                         break;
 757                                 case 4:
 758                                         # Run the parse, protected by a pool counter
 759                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 760
 761                                         $rev = $this->fetchRevisionRecord();
 762                                         $error = null;
 763
 764                                         if ( $rev ) {
 765                                                 $poolArticleView = new PoolWorkArticleView(
 766                                                         $this->getPage(),
 767                                                         $parserOptions,
 768                                                         $this->getRevIdFetched(),
 769                                                         $useParserCache,
 770                                                         $rev,
 771                                                         // permission checking was done earlier via showDeletedRevisionHeader()
 772                                                         RevisionRecord::RAW
 773                                                 );
 774                                                 $ok = $poolArticleView->execute();
 775                                                 $error = $poolArticleView->getError();
 776                                                 $this->mParserOutput = $poolArticleView->getParserOutput() ?: null;
 777
 778                                                 # Don't cache a dirty ParserOutput object
 779                                                 if ( $poolArticleView->getIsDirty() ) {
 780                                                         $outputPage->setCdnMaxage( 0 );
 781                                                         $outputPage->addHTML( "<!-- parser cache is expired, " .
 782                                                                 "sending anyway due to pool overload-->\n" );
 783                                                 }
 784                                         } else {
 785                                                 $ok = false;
 786                                         }
 787
 788                                         if ( !$ok ) {
 789                                                 if ( $error ) {
 790                                                         $outputPage->clearHTML(); // for release() errors
 791                                                         $outputPage->enableClientCache( false );
 792                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 793
 794                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 795                                                         $outputPage->wrapWikiTextAsInterface( 'errorbox', $errortext );
 796                                                 }
 797                                                 # Connection or timeout error
 798                                                 return;
 799                                         }
 800
 801                                         if ( $this->mParserOutput ) {
 802                                                 $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 803                                         }
 804
 805                                         if ( $rev && $this->getRevisionRedirectTarget( $rev ) ) {
 806                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 807                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 808                                         }
 809
 810                                         $outputDone = true;
 811                                         break;
 812                                 # Should be unreachable, but just in case...
 813                                 default:
 814                                         break 2;
 815                         }
 816                 }
 817
 818                 // Get the ParserOutput actually *displayed* here.
 819                 // Note that $this->mParserOutput is the *current*/oldid version output.
 820                 // Note that the ArticleViewHeader hook is allowed to set $outputDone to a
 821                 // ParserOutput instance.
 822                 $pOutput = ( $outputDone instanceof ParserOutput )
 823                         // phpcs:ignore MediaWiki.Usage.NestedInlineTernary.UnparenthesizedTernary -- FIXME T203805
 824                         ? $outputDone // object fetched by hook
 825                         : $this->mParserOutput ?: null; // ParserOutput or null, avoid false
 826
 827                 # Adjust title for main page & pages with displaytitle
 828                 if ( $pOutput ) {
 829                         $this->adjustDisplayTitle( $pOutput );
 830                 }
 831
 832                 # For the main page, overwrite the <title> element with the con-
 833                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 834                 # that's not empty).
 835                 # This message always exists because it is in the i18n files
 836                 if ( $this->getTitle()->isMainPage() ) {
 837                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 838                         if ( !$msg->isDisabled() ) {
 839                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 840                         }
 841                 }
 842
 843                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 844                 # This could use getTouched(), but that could be scary for major template edits.
 845                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 846
 847                 # Check for any __NOINDEX__ tags on the page using $pOutput
 848                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 849                 $outputPage->setIndexPolicy( $policy['index'] );
 850                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 851
 852                 $this->showViewFooter();
 853                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 854
 855                 # Load the postEdit module if the user just saved this revision
 856                 # See also EditPage::setPostEditCookie
 857                 $request = $this->getContext()->getRequest();
 858                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 859                 $postEdit = $request->getCookie( $cookieKey );
 860                 if ( $postEdit ) {
 861                         # Clear the cookie. This also prevents caching of the response.
 862                         $request->response()->clearCookie( $cookieKey );
 863                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 864                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 865                 }
 866         }
 867
 868         /**
 869          * @param RevisionRecord $revision
 870          * @return null|Title
 871          */
 872         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 873                 // TODO: find a *good* place for the code that determines the redirect target for
 874                 // a given revision!
 875                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 876                 $content = $revision->getContent( SlotRecord::MAIN );
 877                 return $content ? $content->getRedirectTarget() : null;
 878         }
 879
 880         /**
 881          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 882          * @param ParserOutput $pOutput
 883          */
 884         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 885                 $out = $this->getContext()->getOutput();
 886
 887                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 888                 $titleText = $pOutput->getTitleText();
 889                 if ( strval( $titleText ) !== '' ) {
 890                         $out->setPageTitle( $titleText );
 891                         $out->setDisplayTitle( $titleText );
 892                 }
 893         }
 894
 895         /**
 896          * Show a diff page according to current request variables. For use within
 897          * Article::view() only, other callers should use the DifferenceEngine class.
 898          */
 899         protected function showDiffPage() {
 900                 $request = $this->getContext()->getRequest();
 901                 $user = $this->getContext()->getUser();
 902                 $diff = $request->getVal( 'diff' );
 903                 $rcid = $request->getVal( 'rcid' );
 904                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 905                 $purge = $request->getVal( 'action' ) == 'purge';
 906                 $unhide = $request->getInt( 'unhide' ) == 1;
 907                 $oldid = $this->getOldID();
 908
 909                 $rev = $this->getRevisionFetched();
 910
 911                 if ( !$rev ) {
 912                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 913                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 914                                 ->params( $oldid )
 915                                 ->numParams( 1 )
 916                                 ->parseAsBlock();
 917                         $this->getContext()->getOutput()->addHTML( $msg );
 918                         return;
 919                 }
 920
 921                 $contentHandler = $rev->getContentHandler();
 922                 $de = $contentHandler->createDifferenceEngine(
 923                         $this->getContext(),
 924                         $oldid,
 925                         $diff,
 926                         $rcid,
 927                         $purge,
 928                         $unhide
 929                 );
 930
 931                 // DifferenceEngine directly fetched the revision:
 932                 $this->mRevIdFetched = $de->getNewid();
 933                 $de->showDiffPage( $diffOnly );
 934
 935                 // Run view updates for the newer revision being diffed (and shown
 936                 // below the diff if not $diffOnly).
 937                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 938                 // New can be false, convert it to 0 - this conveniently means the latest revision
 939                 $this->mPage->doViewUpdates( $user, (int)$new );
 940         }
 941
 942         /**
 943          * Get the robot policy to be used for the current view
 944          * @param string $action The action= GET parameter
 945          * @param ParserOutput|null $pOutput
 946          * @return array The policy that should be set
 947          * @todo actions other than 'view'
 948          */
 949         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 950                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 951
 952                 $ns = $this->getTitle()->getNamespace();
 953
 954                 # Don't index user and user talk pages for blocked users (T13443)
 955                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 956                         $specificTarget = null;
 957                         $vagueTarget = null;
 958                         $titleText = $this->getTitle()->getText();
 959                         if ( IP::isValid( $titleText ) ) {
 960                                 $vagueTarget = $titleText;
 961                         } else {
 962                                 $specificTarget = $titleText;
 963                         }
 964                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 965                                 return [
 966                                         'index' => 'noindex',
 967                                         'follow' => 'nofollow'
 968                                 ];
 969                         }
 970                 }
 971
 972                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 973                         # Non-articles (special pages etc), and old revisions
 974                         return [
 975                                 'index' => 'noindex',
 976                                 'follow' => 'nofollow'
 977                         ];
 978                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 979                         # Discourage indexing of printable versions, but encourage following
 980                         return [
 981                                 'index' => 'noindex',
 982                                 'follow' => 'follow'
 983                         ];
 984                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 985                         # For ?curid=x urls, disallow indexing
 986                         return [
 987                                 'index' => 'noindex',
 988                                 'follow' => 'follow'
 989                         ];
 990                 }
 991
 992                 # Otherwise, construct the policy based on the various config variables.
 993                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 994
 995                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 996                         # Honour customised robot policies for this namespace
 997                         $policy = array_merge(
 998                                 $policy,
 999                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1000                         );
1001                 }
1002                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1003                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1004                         # a final sanity check that we have really got the parser output.
1005                         $policy = array_merge(
1006                                 $policy,
1007                                 [ 'index' => $pOutput->getIndexPolicy() ]
1008                         );
1009                 }
1010
1011                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1012                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1013                         $policy = array_merge(
1014                                 $policy,
1015                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1016                         );
1017                 }
1018
1019                 return $policy;
1020         }
1021
1022         /**
1023          * Converts a String robot policy into an associative array, to allow
1024          * merging of several policies using array_merge().
1025          * @param array|string $policy Returns empty array on null/false/'', transparent
1026          *   to already-converted arrays, converts string.
1027          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1028          */
1029         public static function formatRobotPolicy( $policy ) {
1030                 if ( is_array( $policy ) ) {
1031                         return $policy;
1032                 } elseif ( !$policy ) {
1033                         return [];
1034                 }
1035
1036                 $policy = explode( ',', $policy );
1037                 $policy = array_map( 'trim', $policy );
1038
1039                 $arr = [];
1040                 foreach ( $policy as $var ) {
1041                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1042                                 $arr['index'] = $var;
1043                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1044                                 $arr['follow'] = $var;
1045                         }
1046                 }
1047
1048                 return $arr;
1049         }
1050
1051         /**
1052          * If this request is a redirect view, send "redirected from" subtitle to
1053          * the output. Returns true if the header was needed, false if this is not
1054          * a redirect view. Handles both local and remote redirects.
1055          *
1056          * @return bool
1057          */
1058         public function showRedirectedFromHeader() {
1059                 global $wgRedirectSources;
1060
1061                 $context = $this->getContext();
1062                 $outputPage = $context->getOutput();
1063                 $request = $context->getRequest();
1064                 $rdfrom = $request->getVal( 'rdfrom' );
1065
1066                 // Construct a URL for the current page view, but with the target title
1067                 $query = $request->getValues();
1068                 unset( $query['rdfrom'] );
1069                 unset( $query['title'] );
1070                 if ( $this->getTitle()->isRedirect() ) {
1071                         // Prevent double redirects
1072                         $query['redirect'] = 'no';
1073                 }
1074                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1075
1076                 if ( isset( $this->mRedirectedFrom ) ) {
1077                         // Avoid PHP 7.1 warning of passing $this by reference
1078                         $articlePage = $this;
1079
1080                         // This is an internally redirected page view.
1081                         // We'll need a backlink to the source page for navigation.
1082                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1083                                 $redir = Linker::linkKnown(
1084                                         $this->mRedirectedFrom,
1085                                         null,
1086                                         [],
1087                                         [ 'redirect' => 'no' ]
1088                                 );
1089
1090                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1091                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1092                                 . "</span>" );
1093
1094                                 // Add the script to update the displayed URL and
1095                                 // set the fragment if one was specified in the redirect
1096                                 $outputPage->addJsConfigVars( [
1097                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1098                                 ] );
1099                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1100
1101                                 // Add a <link rel="canonical"> tag
1102                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1103
1104                                 // Tell the output object that the user arrived at this article through a redirect
1105                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1106
1107                                 return true;
1108                         }
1109                 } elseif ( $rdfrom ) {
1110                         // This is an externally redirected view, from some other wiki.
1111                         // If it was reported from a trusted site, supply a backlink.
1112                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1113                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1114                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1115                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1116                                 . "</span>" );
1117
1118                                 // Add the script to update the displayed URL
1119                                 $outputPage->addJsConfigVars( [
1120                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1121                                 ] );
1122                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1123
1124                                 return true;
1125                         }
1126                 }
1127
1128                 return false;
1129         }
1130
1131         /**
1132          * Show a header specific to the namespace currently being viewed, like
1133          * [[MediaWiki:Talkpagetext]]. For Article::view().
1134          */
1135         public function showNamespaceHeader() {
1136                 if ( $this->getTitle()->isTalkPage() ) {
1137                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1138                                 $this->getContext()->getOutput()->wrapWikiMsg(
1139                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1140                                         [ 'talkpageheader' ]
1141                                 );
1142                         }
1143                 }
1144         }
1145
1146         /**
1147          * Show the footer section of an ordinary page view
1148          */
1149         public function showViewFooter() {
1150                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1151                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1152                         && IP::isValid( $this->getTitle()->getText() )
1153                 ) {
1154                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1155                 }
1156
1157                 // Show a footer allowing the user to patrol the shown revision or page if possible
1158                 $patrolFooterShown = $this->showPatrolFooter();
1159
1160                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1161         }
1162
1163         /**
1164          * If patrol is possible, output a patrol UI box. This is called from the
1165          * footer section of ordinary page views. If patrol is not possible or not
1166          * desired, does nothing.
1167          * Side effect: When the patrol link is build, this method will call
1168          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1169          *
1170          * @return bool
1171          */
1172         public function showPatrolFooter() {
1173                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1174
1175                 // Allow hooks to decide whether to not output this at all
1176                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1177                         return false;
1178                 }
1179
1180                 $outputPage = $this->getContext()->getOutput();
1181                 $user = $this->getContext()->getUser();
1182                 $title = $this->getTitle();
1183                 $rc = false;
1184
1185                 if ( !$title->quickUserCan( 'patrol', $user )
1186                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1187                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1188                 ) {
1189                         // Patrolling is disabled or the user isn't allowed to
1190                         return false;
1191                 }
1192
1193                 if ( $this->mRevision
1194                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1195                 ) {
1196                         // The current revision is already older than what could be in the RC table
1197                         // 6h tolerance because the RC might not be cleaned out regularly
1198                         return false;
1199                 }
1200
1201                 // Check for cached results
1202                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1203                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1204                 if ( $cache->get( $key ) ) {
1205                         return false;
1206                 }
1207
1208                 $dbr = wfGetDB( DB_REPLICA );
1209                 $oldestRevisionTimestamp = $dbr->selectField(
1210                         'revision',
1211                         'MIN( rev_timestamp )',
1212                         [ 'rev_page' => $title->getArticleID() ],
1213                         __METHOD__
1214                 );
1215
1216                 // New page patrol: Get the timestamp of the oldest revison which
1217                 // the revision table holds for the given page. Then we look
1218                 // whether it's within the RC lifespan and if it is, we try
1219                 // to get the recentchanges row belonging to that entry
1220                 // (with rc_new = 1).
1221                 $recentPageCreation = false;
1222                 if ( $oldestRevisionTimestamp
1223                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1224                 ) {
1225                         // 6h tolerance because the RC might not be cleaned out regularly
1226                         $recentPageCreation = true;
1227                         $rc = RecentChange::newFromConds(
1228                                 [
1229                                         'rc_new' => 1,
1230                                         'rc_timestamp' => $oldestRevisionTimestamp,
1231                                         'rc_namespace' => $title->getNamespace(),
1232                                         'rc_cur_id' => $title->getArticleID()
1233                                 ],
1234                                 __METHOD__
1235                         );
1236                         if ( $rc ) {
1237                                 // Use generic patrol message for new pages
1238                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1239                         }
1240                 }
1241
1242                 // File patrol: Get the timestamp of the latest upload for this page,
1243                 // check whether it is within the RC lifespan and if it is, we try
1244                 // to get the recentchanges row belonging to that entry
1245                 // (with rc_type = RC_LOG, rc_log_type = upload).
1246                 $recentFileUpload = false;
1247                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1248                         && $title->getNamespace() === NS_FILE ) {
1249                         // Retrieve timestamp of most recent upload
1250                         $newestUploadTimestamp = $dbr->selectField(
1251                                 'image',
1252                                 'MAX( img_timestamp )',
1253                                 [ 'img_name' => $title->getDBkey() ],
1254                                 __METHOD__
1255                         );
1256                         if ( $newestUploadTimestamp
1257                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1258                         ) {
1259                                 // 6h tolerance because the RC might not be cleaned out regularly
1260                                 $recentFileUpload = true;
1261                                 $rc = RecentChange::newFromConds(
1262                                         [
1263                                                 'rc_type' => RC_LOG,
1264                                                 'rc_log_type' => 'upload',
1265                                                 'rc_timestamp' => $newestUploadTimestamp,
1266                                                 'rc_namespace' => NS_FILE,
1267                                                 'rc_cur_id' => $title->getArticleID()
1268                                         ],
1269                                         __METHOD__
1270                                 );
1271                                 if ( $rc ) {
1272                                         // Use patrol message specific to files
1273                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1274                                 }
1275                         }
1276                 }
1277
1278                 if ( !$recentPageCreation && !$recentFileUpload ) {
1279                         // Page creation and latest upload (for files) is too old to be in RC
1280
1281                         // We definitely can't patrol so cache the information
1282                         // When a new file version is uploaded, the cache is cleared
1283                         $cache->set( $key, '1' );
1284
1285                         return false;
1286                 }
1287
1288                 if ( !$rc ) {
1289                         // Don't cache: This can be hit if the page gets accessed very fast after
1290                         // its creation / latest upload or in case we have high replica DB lag. In case
1291                         // the revision is too old, we will already return above.
1292                         return false;
1293                 }
1294
1295                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1296                         // Patrolled RC entry around
1297
1298                         // Cache the information we gathered above in case we can't patrol
1299                         // Don't cache in case we can patrol as this could change
1300                         $cache->set( $key, '1' );
1301
1302                         return false;
1303                 }
1304
1305                 if ( $rc->getPerformer()->equals( $user ) ) {
1306                         // Don't show a patrol link for own creations/uploads. If the user could
1307                         // patrol them, they already would be patrolled
1308                         return false;
1309                 }
1310
1311                 $outputPage->preventClickjacking();
1312                 if ( $user->isAllowed( 'writeapi' ) ) {
1313                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1314                 }
1315
1316                 $link = Linker::linkKnown(
1317                         $title,
1318                         $markPatrolledMsg->escaped(),
1319                         [],
1320                         [
1321                                 'action' => 'markpatrolled',
1322                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1323                         ]
1324                 );
1325
1326                 $outputPage->addHTML(
1327                         "<div class='patrollink' data-mw='interface'>" .
1328                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1329                         '</div>'
1330                 );
1331
1332                 return true;
1333         }
1334
1335         /**
1336          * Purge the cache used to check if it is worth showing the patrol footer
1337          * For example, it is done during re-uploads when file patrol is used.
1338          * @param int $articleID ID of the article to purge
1339          * @since 1.27
1340          */
1341         public static function purgePatrolFooterCache( $articleID ) {
1342                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1343                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1344         }
1345
1346         /**
1347          * Show the error text for a missing article. For articles in the MediaWiki
1348          * namespace, show the default message text. To be called from Article::view().
1349          */
1350         public function showMissingArticle() {
1351                 global $wgSend404Code;
1352
1353                 $outputPage = $this->getContext()->getOutput();
1354                 // Whether the page is a root user page of an existing user (but not a subpage)
1355                 $validUserPage = false;
1356
1357                 $title = $this->getTitle();
1358
1359                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1360                 if ( $title->getNamespace() == NS_USER
1361                         || $title->getNamespace() == NS_USER_TALK
1362                 ) {
1363                         $rootPart = explode( '/', $title->getText() )[0];
1364                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1365                         $ip = User::isIP( $rootPart );
1366                         $block = Block::newFromTarget( $user, $user );
1367
1368                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1369                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1370                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1371                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1372                                 # Show log extract if the user is currently blocked
1373                                 LogEventsList::showLogExtract(
1374                                         $outputPage,
1375                                         'block',
1376                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1377                                         '',
1378                                         [
1379                                                 'lim' => 1,
1380                                                 'showIfEmpty' => false,
1381                                                 'msgKey' => [
1382                                                         'blocked-notice-logextract',
1383                                                         $user->getName() # Support GENDER in notice
1384                                                 ]
1385                                         ]
1386                                 );
1387                                 $validUserPage = !$title->isSubpage();
1388                         } else {
1389                                 $validUserPage = !$title->isSubpage();
1390                         }
1391                 }
1392
1393                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1394
1395                 # Show delete and move logs if there were any such events.
1396                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1397                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1398                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
1399                 $key = $cache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1400                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1401                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1402                 if ( $loggedIn || $cache->get( $key ) || $sessionExists ) {
1403                         $logTypes = [ 'delete', 'move', 'protect' ];
1404
1405                         $dbr = wfGetDB( DB_REPLICA );
1406
1407                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1408                         // Give extensions a chance to hide their (unrelated) log entries
1409                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1410                         LogEventsList::showLogExtract(
1411                                 $outputPage,
1412                                 $logTypes,
1413                                 $title,
1414                                 '',
1415                                 [
1416                                         'lim' => 10,
1417                                         'conds' => $conds,
1418                                         'showIfEmpty' => false,
1419                                         'msgKey' => [ $loggedIn || $sessionExists
1420                                                 ? 'moveddeleted-notice'
1421                                                 : 'moveddeleted-notice-recent'
1422                                         ]
1423                                 ]
1424                         );
1425                 }
1426
1427                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1428                         // If there's no backing content, send a 404 Not Found
1429                         // for better machine handling of broken links.
1430                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1431                 }
1432
1433                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1434                 $policy = $this->getRobotPolicy( 'view' );
1435                 $outputPage->setIndexPolicy( $policy['index'] );
1436                 $outputPage->setFollowPolicy( $policy['follow'] );
1437
1438                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1439
1440                 if ( !$hookResult ) {
1441                         return;
1442                 }
1443
1444                 # Show error message
1445                 $oldid = $this->getOldID();
1446                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1447                         // use fake Content object for system message
1448                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1449                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1450                 } else {
1451                         if ( $oldid ) {
1452                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1453                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1454                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1455                         ) {
1456                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1457                                 $text = wfMessage( $message )->plain();
1458                         } else {
1459                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1460                         }
1461
1462                         $dir = $this->getContext()->getLanguage()->getDir();
1463                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1464                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1465                                 'class' => "noarticletext mw-content-$dir",
1466                                 'dir' => $dir,
1467                                 'lang' => $lang,
1468                         ] ) . "\n$text\n</div>" );
1469                 }
1470         }
1471
1472         /**
1473          * If the revision requested for view is deleted, check permissions.
1474          * Send either an error message or a warning header to the output.
1475          *
1476          * @return bool True if the view is allowed, false if not.
1477          */
1478         public function showDeletedRevisionHeader() {
1479                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1480                         // Not deleted
1481                         return true;
1482                 }
1483
1484                 $outputPage = $this->getContext()->getOutput();
1485                 $user = $this->getContext()->getUser();
1486                 // If the user is not allowed to see it...
1487                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1488                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1489                                 'rev-deleted-text-permission' );
1490
1491                         return false;
1492                 // If the user needs to confirm that they want to see it...
1493                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1494                         # Give explanation and add a link to view the revision...
1495                         $oldid = intval( $this->getOldID() );
1496                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1497                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1498                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1499                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1500                                 [ $msg, $link ] );
1501
1502                         return false;
1503                 // We are allowed to see...
1504                 } else {
1505                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1506                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1507                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1508
1509                         return true;
1510                 }
1511         }
1512
1513         /**
1514          * Generate the navigation links when browsing through an article revisions
1515          * It shows the information as:
1516          *   Revision as of \<date\>; view current revision
1517          *   \<- Previous version | Next Version -\>
1518          *
1519          * @param int $oldid Revision ID of this article revision
1520          */
1521         public function setOldSubtitle( $oldid = 0 ) {
1522                 // Avoid PHP 7.1 warning of passing $this by reference
1523                 $articlePage = $this;
1524
1525                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1526                         return;
1527                 }
1528
1529                 $context = $this->getContext();
1530                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1531
1532                 # Cascade unhide param in links for easy deletion browsing
1533                 $extraParams = [];
1534                 if ( $unhide ) {
1535                         $extraParams['unhide'] = 1;
1536                 }
1537
1538                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1539                         $revision = $this->mRevision;
1540                 } else {
1541                         $revision = Revision::newFromId( $oldid );
1542                 }
1543
1544                 $timestamp = $revision->getTimestamp();
1545
1546                 $current = ( $oldid == $this->mPage->getLatest() );
1547                 $language = $context->getLanguage();
1548                 $user = $context->getUser();
1549
1550                 $td = $language->userTimeAndDate( $timestamp, $user );
1551                 $tddate = $language->userDate( $timestamp, $user );
1552                 $tdtime = $language->userTime( $timestamp, $user );
1553
1554                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1555                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1556
1557                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1558                         ? 'revision-info-current'
1559                         : 'revision-info';
1560
1561                 $outputPage = $context->getOutput();
1562                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1563                         $context->msg( $infomsg, $td )
1564                                 ->rawParams( $userlinks )
1565                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1566                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1567                                 ->parse() .
1568                         "</div>";
1569
1570                 $lnk = $current
1571                         ? $context->msg( 'currentrevisionlink' )->escaped()
1572                         : Linker::linkKnown(
1573                                 $this->getTitle(),
1574                                 $context->msg( 'currentrevisionlink' )->escaped(),
1575                                 [],
1576                                 $extraParams
1577                         );
1578                 $curdiff = $current
1579                         ? $context->msg( 'diff' )->escaped()
1580                         : Linker::linkKnown(
1581                                 $this->getTitle(),
1582                                 $context->msg( 'diff' )->escaped(),
1583                                 [],
1584                                 [
1585                                         'diff' => 'cur',
1586                                         'oldid' => $oldid
1587                                 ] + $extraParams
1588                         );
1589                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1590                 $prevlink = $prev
1591                         ? Linker::linkKnown(
1592                                 $this->getTitle(),
1593                                 $context->msg( 'previousrevision' )->escaped(),
1594                                 [],
1595                                 [
1596                                         'direction' => 'prev',
1597                                         'oldid' => $oldid
1598                                 ] + $extraParams
1599                         )
1600                         : $context->msg( 'previousrevision' )->escaped();
1601                 $prevdiff = $prev
1602                         ? Linker::linkKnown(
1603                                 $this->getTitle(),
1604                                 $context->msg( 'diff' )->escaped(),
1605                                 [],
1606                                 [
1607                                         'diff' => 'prev',
1608                                         'oldid' => $oldid
1609                                 ] + $extraParams
1610                         )
1611                         : $context->msg( 'diff' )->escaped();
1612                 $nextlink = $current
1613                         ? $context->msg( 'nextrevision' )->escaped()
1614                         : Linker::linkKnown(
1615                                 $this->getTitle(),
1616                                 $context->msg( 'nextrevision' )->escaped(),
1617                                 [],
1618                                 [
1619                                         'direction' => 'next',
1620                                         'oldid' => $oldid
1621                                 ] + $extraParams
1622                         );
1623                 $nextdiff = $current
1624                         ? $context->msg( 'diff' )->escaped()
1625                         : Linker::linkKnown(
1626                                 $this->getTitle(),
1627                                 $context->msg( 'diff' )->escaped(),
1628                                 [],
1629                                 [
1630                                         'diff' => 'next',
1631                                         'oldid' => $oldid
1632                                 ] + $extraParams
1633                         );
1634
1635                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1636                 if ( $cdel !== '' ) {
1637                         $cdel .= ' ';
1638                 }
1639
1640                 // the outer div is need for styling the revision info and nav in MobileFrontend
1641                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1642                         "<div id=\"mw-revision-nav\">" . $cdel .
1643                         $context->msg( 'revision-nav' )->rawParams(
1644                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1645                         )->escaped() . "</div></div>" );
1646         }
1647
1648         /**
1649          * Return the HTML for the top of a redirect page
1650          *
1651          * Chances are you should just be using the ParserOutput from
1652          * WikitextContent::getParserOutput instead of calling this for redirects.
1653          *
1654          * @param Title|array $target Destination(s) to redirect
1655          * @param bool $appendSubtitle [optional]
1656          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1657          * @return string Containing HTML with redirect link
1658          *
1659          * @deprecated since 1.30
1660          */
1661         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1662                 $lang = $this->getTitle()->getPageLanguage();
1663                 $out = $this->getContext()->getOutput();
1664                 if ( $appendSubtitle ) {
1665                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1666                 }
1667                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1668                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1669         }
1670
1671         /**
1672          * Return the HTML for the top of a redirect page
1673          *
1674          * Chances are you should just be using the ParserOutput from
1675          * WikitextContent::getParserOutput instead of calling this for redirects.
1676          *
1677          * @since 1.23
1678          * @param Language $lang
1679          * @param Title|array $target Destination(s) to redirect
1680          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1681          * @return string Containing HTML with redirect link
1682          */
1683         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1684                 if ( !is_array( $target ) ) {
1685                         $target = [ $target ];
1686                 }
1687
1688                 $html = '<ul class="redirectText">';
1689                 /** @var Title $title */
1690                 foreach ( $target as $title ) {
1691                         $html .= '<li>' . Linker::link(
1692                                 $title,
1693                                 htmlspecialchars( $title->getFullText() ),
1694                                 [],
1695                                 // Make sure wiki page redirects are not followed
1696                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1697                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1698                         ) . '</li>';
1699                 }
1700                 $html .= '</ul>';
1701
1702                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1703
1704                 return '<div class="redirectMsg">' .
1705                         '<p>' . $redirectToText . '</p>' .
1706                         $html .
1707                         '</div>';
1708         }
1709
1710         /**
1711          * Adds help link with an icon via page indicators.
1712          * Link target can be overridden by a local message containing a wikilink:
1713          * the message key is: 'namespace-' + namespace number + '-helppage'.
1714          * @param string $to Target MediaWiki.org page title or encoded URL.
1715          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1716          * @since 1.25
1717          */
1718         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1719                 $msg = wfMessage(
1720                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1721                 );
1722
1723                 $out = $this->getContext()->getOutput();
1724                 if ( !$msg->isDisabled() ) {
1725                         $helpUrl = Skin::makeUrl( $msg->plain() );
1726                         $out->addHelpLink( $helpUrl, true );
1727                 } else {
1728                         $out->addHelpLink( $to, $overrideBaseUrl );
1729                 }
1730         }
1731
1732         /**
1733          * Handle action=render
1734          */
1735         public function render() {
1736                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1737                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1738                 $this->disableSectionEditForRender = true;
1739                 $this->view();
1740         }
1741
1742         /**
1743          * action=protect handler
1744          */
1745         public function protect() {
1746                 $form = new ProtectionForm( $this );
1747                 $form->execute();
1748         }
1749
1750         /**
1751          * action=unprotect handler (alias)
1752          */
1753         public function unprotect() {
1754                 $this->protect();
1755         }
1756
1757         /**
1758          * UI entry point for page deletion
1759          */
1760         public function delete() {
1761                 # This code desperately needs to be totally rewritten
1762
1763                 $title = $this->getTitle();
1764                 $context = $this->getContext();
1765                 $user = $context->getUser();
1766                 $request = $context->getRequest();
1767
1768                 # Check permissions
1769                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1770                 if ( count( $permissionErrors ) ) {
1771                         throw new PermissionsError( 'delete', $permissionErrors );
1772                 }
1773
1774                 # Read-only check...
1775                 if ( wfReadOnly() ) {
1776                         throw new ReadOnlyError;
1777                 }
1778
1779                 # Better double-check that it hasn't been deleted yet!
1780                 $this->mPage->loadPageData(
1781                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1782                 );
1783                 if ( !$this->mPage->exists() ) {
1784                         $deleteLogPage = new LogPage( 'delete' );
1785                         $outputPage = $context->getOutput();
1786                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1787                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1788                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1789                                 );
1790                         $outputPage->addHTML(
1791                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1792                         );
1793                         LogEventsList::showLogExtract(
1794                                 $outputPage,
1795                                 'delete',
1796                                 $title
1797                         );
1798
1799                         return;
1800                 }
1801
1802                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1803                 $deleteReason = $request->getText( 'wpReason' );
1804
1805                 if ( $deleteReasonList == 'other' ) {
1806                         $reason = $deleteReason;
1807                 } elseif ( $deleteReason != '' ) {
1808                         // Entry from drop down menu + additional comment
1809                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1810                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1811                 } else {
1812                         $reason = $deleteReasonList;
1813                 }
1814
1815                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1816                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1817                 ) {
1818                         # Flag to hide all contents of the archived revisions
1819                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1820
1821                         $this->doDelete( $reason, $suppress );
1822
1823                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1824
1825                         return;
1826                 }
1827
1828                 // Generate deletion reason
1829                 $hasHistory = false;
1830                 if ( !$reason ) {
1831                         try {
1832                                 $reason = $this->generateReason( $hasHistory );
1833                         } catch ( Exception $e ) {
1834                                 # if a page is horribly broken, we still want to be able to
1835                                 # delete it. So be lenient about errors here.
1836                                 wfDebug( "Error while building auto delete summary: $e" );
1837                                 $reason = '';
1838                         }
1839                 }
1840
1841                 // If the page has a history, insert a warning
1842                 if ( $hasHistory ) {
1843                         $title = $this->getTitle();
1844
1845                         // The following can use the real revision count as this is only being shown for users
1846                         // that can delete this page.
1847                         // This, as a side-effect, also makes sure that the following query isn't being run for
1848                         // pages with a larger history, unless the user has the 'bigdelete' right
1849                         // (and is about to delete this page).
1850                         $dbr = wfGetDB( DB_REPLICA );
1851                         $revisions = $edits = (int)$dbr->selectField(
1852                                 'revision',
1853                                 'COUNT(rev_page)',
1854                                 [ 'rev_page' => $title->getArticleID() ],
1855                                 __METHOD__
1856                         );
1857
1858                         // @todo i18n issue/patchwork message
1859                         $context->getOutput()->addHTML(
1860                                 '<strong class="mw-delete-warning-revisions">' .
1861                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1862                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1863                                         $context->msg( 'history' )->escaped(),
1864                                         [],
1865                                         [ 'action' => 'history' ] ) .
1866                                 '</strong>'
1867                         );
1868
1869                         if ( $title->isBigDeletion() ) {
1870                                 global $wgDeleteRevisionsLimit;
1871                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1872                                         [
1873                                                 'delete-warning-toobig',
1874                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1875                                         ]
1876                                 );
1877                         }
1878                 }
1879
1880                 $this->confirmDelete( $reason );
1881         }
1882
1883         /**
1884          * Output deletion confirmation dialog
1885          * @todo Move to another file?
1886          * @param string $reason Prefilled reason
1887          */
1888         public function confirmDelete( $reason ) {
1889                 wfDebug( "Article::confirmDelete\n" );
1890
1891                 $title = $this->getTitle();
1892                 $ctx = $this->getContext();
1893                 $outputPage = $ctx->getOutput();
1894                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1895                 $outputPage->addBacklinkSubtitle( $title );
1896                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1897                 $outputPage->addModules( 'mediawiki.action.delete' );
1898
1899                 $backlinkCache = $title->getBacklinkCache();
1900                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1901                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1902                                 'deleting-backlinks-warning' );
1903                 }
1904
1905                 $subpageQueryLimit = 51;
1906                 $subpages = $title->getSubpages( $subpageQueryLimit );
1907                 $subpageCount = count( $subpages );
1908                 if ( $subpageCount > 0 ) {
1909                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1910                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1911                 }
1912                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1913
1914                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1915
1916                 $user = $this->getContext()->getUser();
1917                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1918
1919                 $outputPage->enableOOUI();
1920
1921                 $options = Xml::listDropDownOptions(
1922                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1923                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1924                 );
1925                 $options = Xml::listDropDownOptionsOoui( $options );
1926
1927                 $fields[] = new OOUI\FieldLayout(
1928                         new OOUI\DropdownInputWidget( [
1929                                 'name' => 'wpDeleteReasonList',
1930                                 'inputId' => 'wpDeleteReasonList',
1931                                 'tabIndex' => 1,
1932                                 'infusable' => true,
1933                                 'value' => '',
1934                                 'options' => $options
1935                         ] ),
1936                         [
1937                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1938                                 'align' => 'top',
1939                         ]
1940                 );
1941
1942                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1943                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1944                 // Unicode codepoints (or 255 UTF-8 bytes for old schema).
1945                 $conf = $this->getContext()->getConfig();
1946                 $oldCommentSchema = $conf->get( 'CommentTableSchemaMigrationStage' ) === MIGRATION_OLD;
1947                 $fields[] = new OOUI\FieldLayout(
1948                         new OOUI\TextInputWidget( [
1949                                 'name' => 'wpReason',
1950                                 'inputId' => 'wpReason',
1951                                 'tabIndex' => 2,
1952                                 'maxLength' => $oldCommentSchema ? 255 : CommentStore::COMMENT_CHARACTER_LIMIT,
1953                                 'infusable' => true,
1954                                 'value' => $reason,
1955                                 'autofocus' => true,
1956                         ] ),
1957                         [
1958                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1959                                 'align' => 'top',
1960                         ]
1961                 );
1962
1963                 if ( $user->isLoggedIn() ) {
1964                         $fields[] = new OOUI\FieldLayout(
1965                                 new OOUI\CheckboxInputWidget( [
1966                                         'name' => 'wpWatch',
1967                                         'inputId' => 'wpWatch',
1968                                         'tabIndex' => 3,
1969                                         'selected' => $checkWatch,
1970                                 ] ),
1971                                 [
1972                                         'label' => $ctx->msg( 'watchthis' )->text(),
1973                                         'align' => 'inline',
1974                                         'infusable' => true,
1975                                 ]
1976                         );
1977                 }
1978
1979                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1980                         $fields[] = new OOUI\FieldLayout(
1981                                 new OOUI\CheckboxInputWidget( [
1982                                         'name' => 'wpSuppress',
1983                                         'inputId' => 'wpSuppress',
1984                                         'tabIndex' => 4,
1985                                 ] ),
1986                                 [
1987                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1988                                         'align' => 'inline',
1989                                         'infusable' => true,
1990                                 ]
1991                         );
1992                 }
1993
1994                 $fields[] = new OOUI\FieldLayout(
1995                         new OOUI\ButtonInputWidget( [
1996                                 'name' => 'wpConfirmB',
1997                                 'inputId' => 'wpConfirmB',
1998                                 'tabIndex' => 5,
1999                                 'value' => $ctx->msg( 'deletepage' )->text(),
2000                                 'label' => $ctx->msg( 'deletepage' )->text(),
2001                                 'flags' => [ 'primary', 'destructive' ],
2002                                 'type' => 'submit',
2003                         ] ),
2004                         [
2005                                 'align' => 'top',
2006                         ]
2007                 );
2008
2009                 $fieldset = new OOUI\FieldsetLayout( [
2010                         'label' => $ctx->msg( 'delete-legend' )->text(),
2011                         'id' => 'mw-delete-table',
2012                         'items' => $fields,
2013                 ] );
2014
2015                 $form = new OOUI\FormLayout( [
2016                         'method' => 'post',
2017                         'action' => $title->getLocalURL( 'action=delete' ),
2018                         'id' => 'deleteconfirm',
2019                 ] );
2020                 $form->appendContent(
2021                         $fieldset,
2022                         new OOUI\HtmlSnippet(
2023                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2024                         )
2025                 );
2026
2027                 $outputPage->addHTML(
2028                         new OOUI\PanelLayout( [
2029                                 'classes' => [ 'deletepage-wrapper' ],
2030                                 'expanded' => false,
2031                                 'padded' => true,
2032                                 'framed' => true,
2033                                 'content' => $form,
2034                         ] )
2035                 );
2036
2037                 if ( $user->isAllowed( 'editinterface' ) ) {
2038                         $link = Linker::linkKnown(
2039                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2040                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2041                                 [],
2042                                 [ 'action' => 'edit' ]
2043                         );
2044                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2045                 }
2046
2047                 $deleteLogPage = new LogPage( 'delete' );
2048                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2049                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2050         }
2051
2052         /**
2053          * Perform a deletion and output success or failure messages
2054          * @param string $reason
2055          * @param bool $suppress
2056          * @param bool $immediate false allows deleting over time via the job queue
2057          * @throws FatalError
2058          * @throws MWException
2059          */
2060         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2061                 $error = '';
2062                 $context = $this->getContext();
2063                 $outputPage = $context->getOutput();
2064                 $user = $context->getUser();
2065                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2066                         [], 'delete', $immediate );
2067
2068                 if ( $status->isOK() ) {
2069                         $deleted = $this->getTitle()->getPrefixedText();
2070
2071                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2072                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2073
2074                         if ( $status->isGood() ) {
2075                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2076                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2077                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2078                         } else {
2079                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2080                         }
2081
2082                         $outputPage->returnToMain( false );
2083                 } else {
2084                         $outputPage->setPageTitle(
2085                                 wfMessage( 'cannotdelete-title',
2086                                         $this->getTitle()->getPrefixedText() )
2087                         );
2088
2089                         if ( $error == '' ) {
2090                                 $outputPage->wrapWikiTextAsInterface(
2091                                         'error mw-error-cannotdelete',
2092                                         $status->getWikiText()
2093                                 );
2094                                 $deleteLogPage = new LogPage( 'delete' );
2095                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2096
2097                                 LogEventsList::showLogExtract(
2098                                         $outputPage,
2099                                         'delete',
2100                                         $this->getTitle()
2101                                 );
2102                         } else {
2103                                 $outputPage->addHTML( $error );
2104                         }
2105                 }
2106         }
2107
2108         /* Caching functions */
2109
2110         /**
2111          * checkLastModified returns true if it has taken care of all
2112          * output to the client that is necessary for this request.
2113          * (that is, it has sent a cached version of the page)
2114          *
2115          * @return bool True if cached version send, false otherwise
2116          */
2117         protected function tryFileCache() {
2118                 static $called = false;
2119
2120                 if ( $called ) {
2121                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2122                         return false;
2123                 }
2124
2125                 $called = true;
2126                 if ( $this->isFileCacheable() ) {
2127                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2128                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2129                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2130                                 $cache->loadFromFileCache( $this->getContext() );
2131                                 return true;
2132                         } else {
2133                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2134                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2135                         }
2136                 } else {
2137                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2138                 }
2139
2140                 return false;
2141         }
2142
2143         /**
2144          * Check if the page can be cached
2145          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2146          * @return bool
2147          */
2148         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2149                 $cacheable = false;
2150
2151                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2152                         $cacheable = $this->mPage->getId()
2153                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2154                         // Extension may have reason to disable file caching on some pages.
2155                         if ( $cacheable ) {
2156                                 // Avoid PHP 7.1 warning of passing $this by reference
2157                                 $articlePage = $this;
2158                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2159                         }
2160                 }
2161
2162                 return $cacheable;
2163         }
2164
2165         /**#@-*/
2166
2167         /**
2168          * Lightweight method to get the parser output for a page, checking the parser cache
2169          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2170          * consider, so it's not appropriate to use there.
2171          *
2172          * @since 1.16 (r52326) for LiquidThreads
2173          *
2174          * @param int|null $oldid Revision ID or null
2175          * @param User|null $user The relevant user
2176          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2177          */
2178         public function getParserOutput( $oldid = null, User $user = null ) {
2179                 // XXX: bypasses mParserOptions and thus setParserOptions()
2180
2181                 if ( $user === null ) {
2182                         $parserOptions = $this->getParserOptions();
2183                 } else {
2184                         $parserOptions = $this->mPage->makeParserOptions( $user );
2185                 }
2186
2187                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2188         }
2189
2190         /**
2191          * Override the ParserOptions used to render the primary article wikitext.
2192          *
2193          * @param ParserOptions $options
2194          * @throws MWException If the parser options where already initialized.
2195          */
2196         public function setParserOptions( ParserOptions $options ) {
2197                 if ( $this->mParserOptions ) {
2198                         throw new MWException( "can't change parser options after they have already been set" );
2199                 }
2200
2201                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2202                 $this->mParserOptions = clone $options;
2203         }
2204
2205         /**
2206          * Get parser options suitable for rendering the primary article wikitext
2207          * @return ParserOptions
2208          */
2209         public function getParserOptions() {
2210                 if ( !$this->mParserOptions ) {
2211                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2212                 }
2213                 // Clone to allow modifications of the return value without affecting cache
2214                 return clone $this->mParserOptions;
2215         }
2216
2217         /**
2218          * Sets the context this Article is executed in
2219          *
2220          * @param IContextSource $context
2221          * @since 1.18
2222          */
2223         public function setContext( $context ) {
2224                 $this->mContext = $context;
2225         }
2226
2227         /**
2228          * Gets the context this Article is executed in
2229          *
2230          * @return IContextSource
2231          * @since 1.18
2232          */
2233         public function getContext() {
2234                 if ( $this->mContext instanceof IContextSource ) {
2235                         return $this->mContext;
2236                 } else {
2237                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2238                                 "Return RequestContext::getMain(); for sanity\n" );
2239                         return RequestContext::getMain();
2240                 }
2241         }
2242
2243         /**
2244          * Use PHP's magic __get handler to handle accessing of
2245          * raw WikiPage fields for backwards compatibility.
2246          *
2247          * @param string $fname Field name
2248          * @return mixed
2249          */
2250         public function __get( $fname ) {
2251                 if ( property_exists( $this->mPage, $fname ) ) {
2252                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2253                         return $this->mPage->$fname;
2254                 }
2255                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2256         }
2257
2258         /**
2259          * Use PHP's magic __set handler to handle setting of
2260          * raw WikiPage fields for backwards compatibility.
2261          *
2262          * @param string $fname Field name
2263          * @param mixed $fvalue New value
2264          */
2265         public function __set( $fname, $fvalue ) {
2266                 if ( property_exists( $this->mPage, $fname ) ) {
2267                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2268                         $this->mPage->$fname = $fvalue;
2269                 // Note: extensions may want to toss on new fields
2270                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2271                         $this->mPage->$fname = $fvalue;
2272                 } else {
2273                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2274                 }
2275         }
2276
2277         /**
2278          * Call to WikiPage function for backwards compatibility.
2279          * @see WikiPage::checkFlags
2280          */
2281         public function checkFlags( $flags ) {
2282                 return $this->mPage->checkFlags( $flags );
2283         }
2284
2285         /**
2286          * Call to WikiPage function for backwards compatibility.
2287          * @see WikiPage::checkTouched
2288          */
2289         public function checkTouched() {
2290                 return $this->mPage->checkTouched();
2291         }
2292
2293         /**
2294          * Call to WikiPage function for backwards compatibility.
2295          * @see WikiPage::clearPreparedEdit
2296          */
2297         public function clearPreparedEdit() {
2298                 $this->mPage->clearPreparedEdit();
2299         }
2300
2301         /**
2302          * Call to WikiPage function for backwards compatibility.
2303          * @see WikiPage::doDeleteArticleReal
2304          */
2305         public function doDeleteArticleReal(
2306                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2307                 $tags = [], $immediate = false
2308         ) {
2309                 return $this->mPage->doDeleteArticleReal(
2310                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2311                 );
2312         }
2313
2314         /**
2315          * Call to WikiPage function for backwards compatibility.
2316          * @see WikiPage::doDeleteUpdates
2317          */
2318         public function doDeleteUpdates(
2319                 $id,
2320                 Content $content = null,
2321                 $revision = null,
2322                 User $user = null
2323         ) {
2324                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2325         }
2326
2327         /**
2328          * Call to WikiPage function for backwards compatibility.
2329          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2330          * @see WikiPage::doEditContent
2331          */
2332         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2333                 User $user = null, $serialFormat = null
2334         ) {
2335                 wfDeprecated( __METHOD__, '1.29' );
2336                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2337                         $user, $serialFormat
2338                 );
2339         }
2340
2341         /**
2342          * Call to WikiPage function for backwards compatibility.
2343          * @see WikiPage::doEditUpdates
2344          */
2345         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2346                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2347         }
2348
2349         /**
2350          * Call to WikiPage function for backwards compatibility.
2351          * @see WikiPage::doPurge
2352          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2353          *  controlled how much purging was done.
2354          */
2355         public function doPurge() {
2356                 return $this->mPage->doPurge();
2357         }
2358
2359         /**
2360          * Call to WikiPage function for backwards compatibility.
2361          * @see WikiPage::doViewUpdates
2362          */
2363         public function doViewUpdates( User $user, $oldid = 0 ) {
2364                 $this->mPage->doViewUpdates( $user, $oldid );
2365         }
2366
2367         /**
2368          * Call to WikiPage function for backwards compatibility.
2369          * @see WikiPage::exists
2370          */
2371         public function exists() {
2372                 return $this->mPage->exists();
2373         }
2374
2375         /**
2376          * Call to WikiPage function for backwards compatibility.
2377          * @see WikiPage::followRedirect
2378          */
2379         public function followRedirect() {
2380                 return $this->mPage->followRedirect();
2381         }
2382
2383         /**
2384          * Call to WikiPage function for backwards compatibility.
2385          * @see ContentHandler::getActionOverrides
2386          */
2387         public function getActionOverrides() {
2388                 return $this->mPage->getActionOverrides();
2389         }
2390
2391         /**
2392          * Call to WikiPage function for backwards compatibility.
2393          * @see WikiPage::getAutoDeleteReason
2394          */
2395         public function getAutoDeleteReason( &$hasHistory ) {
2396                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2397         }
2398
2399         /**
2400          * Call to WikiPage function for backwards compatibility.
2401          * @see WikiPage::getCategories
2402          */
2403         public function getCategories() {
2404                 return $this->mPage->getCategories();
2405         }
2406
2407         /**
2408          * Call to WikiPage function for backwards compatibility.
2409          * @see WikiPage::getComment
2410          */
2411         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2412                 return $this->mPage->getComment( $audience, $user );
2413         }
2414
2415         /**
2416          * Call to WikiPage function for backwards compatibility.
2417          * @see WikiPage::getContentHandler
2418          */
2419         public function getContentHandler() {
2420                 return $this->mPage->getContentHandler();
2421         }
2422
2423         /**
2424          * Call to WikiPage function for backwards compatibility.
2425          * @see WikiPage::getContentModel
2426          */
2427         public function getContentModel() {
2428                 return $this->mPage->getContentModel();
2429         }
2430
2431         /**
2432          * Call to WikiPage function for backwards compatibility.
2433          * @see WikiPage::getContributors
2434          */
2435         public function getContributors() {
2436                 return $this->mPage->getContributors();
2437         }
2438
2439         /**
2440          * Call to WikiPage function for backwards compatibility.
2441          * @see WikiPage::getCreator
2442          */
2443         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2444                 return $this->mPage->getCreator( $audience, $user );
2445         }
2446
2447         /**
2448          * Call to WikiPage function for backwards compatibility.
2449          * @see WikiPage::getDeletionUpdates
2450          */
2451         public function getDeletionUpdates( Content $content = null ) {
2452                 return $this->mPage->getDeletionUpdates( $content );
2453         }
2454
2455         /**
2456          * Call to WikiPage function for backwards compatibility.
2457          * @see WikiPage::getHiddenCategories
2458          */
2459         public function getHiddenCategories() {
2460                 return $this->mPage->getHiddenCategories();
2461         }
2462
2463         /**
2464          * Call to WikiPage function for backwards compatibility.
2465          * @see WikiPage::getId
2466          */
2467         public function getId() {
2468                 return $this->mPage->getId();
2469         }
2470
2471         /**
2472          * Call to WikiPage function for backwards compatibility.
2473          * @see WikiPage::getLatest
2474          */
2475         public function getLatest() {
2476                 return $this->mPage->getLatest();
2477         }
2478
2479         /**
2480          * Call to WikiPage function for backwards compatibility.
2481          * @see WikiPage::getLinksTimestamp
2482          */
2483         public function getLinksTimestamp() {
2484                 return $this->mPage->getLinksTimestamp();
2485         }
2486
2487         /**
2488          * Call to WikiPage function for backwards compatibility.
2489          * @see WikiPage::getMinorEdit
2490          */
2491         public function getMinorEdit() {
2492                 return $this->mPage->getMinorEdit();
2493         }
2494
2495         /**
2496          * Call to WikiPage function for backwards compatibility.
2497          * @see WikiPage::getOldestRevision
2498          */
2499         public function getOldestRevision() {
2500                 return $this->mPage->getOldestRevision();
2501         }
2502
2503         /**
2504          * Call to WikiPage function for backwards compatibility.
2505          * @see WikiPage::getRedirectTarget
2506          */
2507         public function getRedirectTarget() {
2508                 return $this->mPage->getRedirectTarget();
2509         }
2510
2511         /**
2512          * Call to WikiPage function for backwards compatibility.
2513          * @see WikiPage::getRedirectURL
2514          */
2515         public function getRedirectURL( $rt ) {
2516                 return $this->mPage->getRedirectURL( $rt );
2517         }
2518
2519         /**
2520          * Call to WikiPage function for backwards compatibility.
2521          * @see WikiPage::getRevision
2522          */
2523         public function getRevision() {
2524                 return $this->mPage->getRevision();
2525         }
2526
2527         /**
2528          * Call to WikiPage function for backwards compatibility.
2529          * @see WikiPage::getTimestamp
2530          */
2531         public function getTimestamp() {
2532                 return $this->mPage->getTimestamp();
2533         }
2534
2535         /**
2536          * Call to WikiPage function for backwards compatibility.
2537          * @see WikiPage::getTouched
2538          */
2539         public function getTouched() {
2540                 return $this->mPage->getTouched();
2541         }
2542
2543         /**
2544          * Call to WikiPage function for backwards compatibility.
2545          * @see WikiPage::getUndoContent
2546          */
2547         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2548                 return $this->mPage->getUndoContent( $undo, $undoafter );
2549         }
2550
2551         /**
2552          * Call to WikiPage function for backwards compatibility.
2553          * @see WikiPage::getUser
2554          */
2555         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2556                 return $this->mPage->getUser( $audience, $user );
2557         }
2558
2559         /**
2560          * Call to WikiPage function for backwards compatibility.
2561          * @see WikiPage::getUserText
2562          */
2563         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2564                 return $this->mPage->getUserText( $audience, $user );
2565         }
2566
2567         /**
2568          * Call to WikiPage function for backwards compatibility.
2569          * @see WikiPage::hasViewableContent
2570          */
2571         public function hasViewableContent() {
2572                 return $this->mPage->hasViewableContent();
2573         }
2574
2575         /**
2576          * Call to WikiPage function for backwards compatibility.
2577          * @see WikiPage::insertOn
2578          */
2579         public function insertOn( $dbw, $pageId = null ) {
2580                 return $this->mPage->insertOn( $dbw, $pageId );
2581         }
2582
2583         /**
2584          * Call to WikiPage function for backwards compatibility.
2585          * @see WikiPage::insertProtectNullRevision
2586          */
2587         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2588                 array $expiry, $cascade, $reason, $user = null
2589         ) {
2590                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2591                         $expiry, $cascade, $reason, $user
2592                 );
2593         }
2594
2595         /**
2596          * Call to WikiPage function for backwards compatibility.
2597          * @see WikiPage::insertRedirect
2598          */
2599         public function insertRedirect() {
2600                 return $this->mPage->insertRedirect();
2601         }
2602
2603         /**
2604          * Call to WikiPage function for backwards compatibility.
2605          * @see WikiPage::insertRedirectEntry
2606          */
2607         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2608                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2609         }
2610
2611         /**
2612          * Call to WikiPage function for backwards compatibility.
2613          * @see WikiPage::isCountable
2614          */
2615         public function isCountable( $editInfo = false ) {
2616                 return $this->mPage->isCountable( $editInfo );
2617         }
2618
2619         /**
2620          * Call to WikiPage function for backwards compatibility.
2621          * @see WikiPage::isRedirect
2622          */
2623         public function isRedirect() {
2624                 return $this->mPage->isRedirect();
2625         }
2626
2627         /**
2628          * Call to WikiPage function for backwards compatibility.
2629          * @see WikiPage::loadFromRow
2630          */
2631         public function loadFromRow( $data, $from ) {
2632                 return $this->mPage->loadFromRow( $data, $from );
2633         }
2634
2635         /**
2636          * Call to WikiPage function for backwards compatibility.
2637          * @see WikiPage::loadPageData
2638          */
2639         public function loadPageData( $from = 'fromdb' ) {
2640                 $this->mPage->loadPageData( $from );
2641         }
2642
2643         /**
2644          * Call to WikiPage function for backwards compatibility.
2645          * @see WikiPage::lockAndGetLatest
2646          */
2647         public function lockAndGetLatest() {
2648                 return $this->mPage->lockAndGetLatest();
2649         }
2650
2651         /**
2652          * Call to WikiPage function for backwards compatibility.
2653          * @see WikiPage::makeParserOptions
2654          */
2655         public function makeParserOptions( $context ) {
2656                 return $this->mPage->makeParserOptions( $context );
2657         }
2658
2659         /**
2660          * Call to WikiPage function for backwards compatibility.
2661          * @see WikiPage::pageDataFromId
2662          */
2663         public function pageDataFromId( $dbr, $id, $options = [] ) {
2664                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2665         }
2666
2667         /**
2668          * Call to WikiPage function for backwards compatibility.
2669          * @see WikiPage::pageDataFromTitle
2670          */
2671         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2672                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2673         }
2674
2675         /**
2676          * Call to WikiPage function for backwards compatibility.
2677          * @see WikiPage::prepareContentForEdit
2678          */
2679         public function prepareContentForEdit(
2680                 Content $content, $revision = null, User $user = null,
2681                 $serialFormat = null, $useCache = true
2682         ) {
2683                 return $this->mPage->prepareContentForEdit(
2684                         $content, $revision, $user,
2685                         $serialFormat, $useCache
2686                 );
2687         }
2688
2689         /**
2690          * Call to WikiPage function for backwards compatibility.
2691          * @see WikiPage::protectDescription
2692          */
2693         public function protectDescription( array $limit, array $expiry ) {
2694                 return $this->mPage->protectDescription( $limit, $expiry );
2695         }
2696
2697         /**
2698          * Call to WikiPage function for backwards compatibility.
2699          * @see WikiPage::protectDescriptionLog
2700          */
2701         public function protectDescriptionLog( array $limit, array $expiry ) {
2702                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2703         }
2704
2705         /**
2706          * Call to WikiPage function for backwards compatibility.
2707          * @see WikiPage::replaceSectionAtRev
2708          */
2709         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2710                 $sectionTitle = '', $baseRevId = null
2711         ) {
2712                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2713                         $sectionTitle, $baseRevId
2714                 );
2715         }
2716
2717         /**
2718          * Call to WikiPage function for backwards compatibility.
2719          * @see WikiPage::replaceSectionContent
2720          */
2721         public function replaceSectionContent(
2722                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2723         ) {
2724                 return $this->mPage->replaceSectionContent(
2725                         $sectionId, $sectionContent, $sectionTitle, $edittime
2726                 );
2727         }
2728
2729         /**
2730          * Call to WikiPage function for backwards compatibility.
2731          * @see WikiPage::setTimestamp
2732          */
2733         public function setTimestamp( $ts ) {
2734                 return $this->mPage->setTimestamp( $ts );
2735         }
2736
2737         /**
2738          * Call to WikiPage function for backwards compatibility.
2739          * @see WikiPage::shouldCheckParserCache
2740          */
2741         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2742                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2743         }
2744
2745         /**
2746          * Call to WikiPage function for backwards compatibility.
2747          * @see WikiPage::supportsSections
2748          */
2749         public function supportsSections() {
2750                 return $this->mPage->supportsSections();
2751         }
2752
2753         /**
2754          * Call to WikiPage function for backwards compatibility.
2755          * @see WikiPage::triggerOpportunisticLinksUpdate
2756          */
2757         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2758                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2759         }
2760
2761         /**
2762          * Call to WikiPage function for backwards compatibility.
2763          * @see WikiPage::updateCategoryCounts
2764          */
2765         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2766                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2767         }
2768
2769         /**
2770          * Call to WikiPage function for backwards compatibility.
2771          * @see WikiPage::updateIfNewerOn
2772          */
2773         public function updateIfNewerOn( $dbw, $revision ) {
2774                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2775         }
2776
2777         /**
2778          * Call to WikiPage function for backwards compatibility.
2779          * @see WikiPage::updateRedirectOn
2780          */
2781         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2782                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2783         }
2784
2785         /**
2786          * Call to WikiPage function for backwards compatibility.
2787          * @see WikiPage::updateRevisionOn
2788          */
2789         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2790                 $lastRevIsRedirect = null
2791         ) {
2792                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2793                         $lastRevIsRedirect
2794                 );
2795         }
2796
2797         /**
2798          * @param array $limit
2799          * @param array $expiry
2800          * @param bool &$cascade
2801          * @param string $reason
2802          * @param User $user
2803          * @return Status
2804          */
2805         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2806                 $reason, User $user
2807         ) {
2808                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2809         }
2810
2811         /**
2812          * @param array $limit
2813          * @param string $reason
2814          * @param int &$cascade
2815          * @param array $expiry
2816          * @return bool
2817          */
2818         public function updateRestrictions( $limit = [], $reason = '',
2819                 &$cascade = 0, $expiry = []
2820         ) {
2821                 return $this->mPage->doUpdateRestrictions(
2822                         $limit,
2823                         $expiry,
2824                         $cascade,
2825                         $reason,
2826                         $this->getContext()->getUser()
2827                 );
2828         }
2829
2830         /**
2831          * @param string $reason
2832          * @param bool $suppress
2833          * @param int|null $u1 Unused
2834          * @param bool|null $u2 Unused
2835          * @param string &$error
2836          * @param bool $immediate false allows deleting over time via the job queue
2837          * @return bool
2838          * @throws FatalError
2839          * @throws MWException
2840          */
2841         public function doDeleteArticle(
2842                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2843         ) {
2844                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2845                         null, $immediate );
2846         }
2847
2848         /**
2849          * @param string $fromP
2850          * @param string $summary
2851          * @param string $token
2852          * @param bool $bot
2853          * @param array &$resultDetails
2854          * @param User|null $user
2855          * @return array
2856          */
2857         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2858                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2859                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2860         }
2861
2862         /**
2863          * @param string $fromP
2864          * @param string $summary
2865          * @param bool $bot
2866          * @param array &$resultDetails
2867          * @param User|null $guser
2868          * @return array
2869          */
2870         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2871                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2872                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2873         }
2874
2875         /**
2876          * @param bool &$hasHistory
2877          * @return mixed
2878          */
2879         public function generateReason( &$hasHistory ) {
2880                 $title = $this->mPage->getTitle();
2881                 $handler = ContentHandler::getForTitle( $title );
2882                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2883         }
2884
2885         // ******
2886 }