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\Block\DatabaseBlock;
  23 use MediaWiki\MediaWikiServices;
  24 use MediaWiki\Revision\MutableRevisionRecord;
  25 use MediaWiki\Revision\RevisionRecord;
  26 use MediaWiki\Revision\SlotRecord;
  27
  28 /**
  29  * Class for viewing MediaWiki article and history.
  30  *
  31  * This maintains WikiPage functions for backwards compatibility.
  32  *
  33  * @todo Move and rewrite code to an Action class
  34  *
  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         protected $viewIsRenderAction = 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 );
 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 ( $this->viewIsRenderAction
 637                         || !$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                         ? $outputDone // object fetched by hook
 824                         : ( $this->mParserOutput ?: null ); // ParserOutput or null, avoid false
 825
 826                 # Adjust title for main page & pages with displaytitle
 827                 if ( $pOutput ) {
 828                         $this->adjustDisplayTitle( $pOutput );
 829                 }
 830
 831                 # For the main page, overwrite the <title> element with the con-
 832                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 833                 # that's not empty).
 834                 # This message always exists because it is in the i18n files
 835                 if ( $this->getTitle()->isMainPage() ) {
 836                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 837                         if ( !$msg->isDisabled() ) {
 838                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 839                         }
 840                 }
 841
 842                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 843                 # This could use getTouched(), but that could be scary for major template edits.
 844                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 845
 846                 # Check for any __NOINDEX__ tags on the page using $pOutput
 847                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 848                 $outputPage->setIndexPolicy( $policy['index'] );
 849                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 850
 851                 $this->showViewFooter();
 852                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 853
 854                 # Load the postEdit module if the user just saved this revision
 855                 # See also EditPage::setPostEditCookie
 856                 $request = $this->getContext()->getRequest();
 857                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 858                 $postEdit = $request->getCookie( $cookieKey );
 859                 if ( $postEdit ) {
 860                         # Clear the cookie. This also prevents caching of the response.
 861                         $request->response()->clearCookie( $cookieKey );
 862                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 863                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 864                 }
 865         }
 866
 867         /**
 868          * @param RevisionRecord $revision
 869          * @return null|Title
 870          */
 871         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 872                 // TODO: find a *good* place for the code that determines the redirect target for
 873                 // a given revision!
 874                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 875                 $content = $revision->getContent( SlotRecord::MAIN );
 876                 return $content ? $content->getRedirectTarget() : null;
 877         }
 878
 879         /**
 880          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 881          * @param ParserOutput $pOutput
 882          */
 883         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 884                 $out = $this->getContext()->getOutput();
 885
 886                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 887                 $titleText = $pOutput->getTitleText();
 888                 if ( strval( $titleText ) !== '' ) {
 889                         $out->setPageTitle( $titleText );
 890                         $out->setDisplayTitle( $titleText );
 891                 }
 892         }
 893
 894         /**
 895          * Show a diff page according to current request variables. For use within
 896          * Article::view() only, other callers should use the DifferenceEngine class.
 897          */
 898         protected function showDiffPage() {
 899                 $request = $this->getContext()->getRequest();
 900                 $user = $this->getContext()->getUser();
 901                 $diff = $request->getVal( 'diff' );
 902                 $rcid = $request->getVal( 'rcid' );
 903                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 904                 $purge = $request->getVal( 'action' ) == 'purge';
 905                 $unhide = $request->getInt( 'unhide' ) == 1;
 906                 $oldid = $this->getOldID();
 907
 908                 $rev = $this->getRevisionFetched();
 909
 910                 if ( !$rev ) {
 911                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 912                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 913                                 ->params( $oldid )
 914                                 ->numParams( 1 )
 915                                 ->parseAsBlock();
 916                         $this->getContext()->getOutput()->addHTML( $msg );
 917                         return;
 918                 }
 919
 920                 $contentHandler = $rev->getContentHandler();
 921                 $de = $contentHandler->createDifferenceEngine(
 922                         $this->getContext(),
 923                         $oldid,
 924                         $diff,
 925                         $rcid,
 926                         $purge,
 927                         $unhide
 928                 );
 929
 930                 // DifferenceEngine directly fetched the revision:
 931                 $this->mRevIdFetched = $de->getNewid();
 932                 $de->showDiffPage( $diffOnly );
 933
 934                 // Run view updates for the newer revision being diffed (and shown
 935                 // below the diff if not $diffOnly).
 936                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 937                 // New can be false, convert it to 0 - this conveniently means the latest revision
 938                 $this->mPage->doViewUpdates( $user, (int)$new );
 939         }
 940
 941         /**
 942          * Get the robot policy to be used for the current view
 943          * @param string $action The action= GET parameter
 944          * @param ParserOutput|null $pOutput
 945          * @return array The policy that should be set
 946          * @todo actions other than 'view'
 947          */
 948         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 949                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 950
 951                 $ns = $this->getTitle()->getNamespace();
 952
 953                 # Don't index user and user talk pages for blocked users (T13443)
 954                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 955                         $specificTarget = null;
 956                         $vagueTarget = null;
 957                         $titleText = $this->getTitle()->getText();
 958                         if ( IP::isValid( $titleText ) ) {
 959                                 $vagueTarget = $titleText;
 960                         } else {
 961                                 $specificTarget = $titleText;
 962                         }
 963                         if ( DatabaseBlock::newFromTarget( $specificTarget, $vagueTarget ) instanceof DatabaseBlock ) {
 964                                 return [
 965                                         'index' => 'noindex',
 966                                         'follow' => 'nofollow'
 967                                 ];
 968                         }
 969                 }
 970
 971                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 972                         # Non-articles (special pages etc), and old revisions
 973                         return [
 974                                 'index' => 'noindex',
 975                                 'follow' => 'nofollow'
 976                         ];
 977                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 978                         # Discourage indexing of printable versions, but encourage following
 979                         return [
 980                                 'index' => 'noindex',
 981                                 'follow' => 'follow'
 982                         ];
 983                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 984                         # For ?curid=x urls, disallow indexing
 985                         return [
 986                                 'index' => 'noindex',
 987                                 'follow' => 'follow'
 988                         ];
 989                 }
 990
 991                 # Otherwise, construct the policy based on the various config variables.
 992                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 993
 994                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 995                         # Honour customised robot policies for this namespace
 996                         $policy = array_merge(
 997                                 $policy,
 998                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 999                         );
1000                 }
1001                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1002                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1003                         # a final sanity check that we have really got the parser output.
1004                         $policy = array_merge(
1005                                 $policy,
1006                                 [ 'index' => $pOutput->getIndexPolicy() ]
1007                         );
1008                 }
1009
1010                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1011                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1012                         $policy = array_merge(
1013                                 $policy,
1014                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1015                         );
1016                 }
1017
1018                 return $policy;
1019         }
1020
1021         /**
1022          * Converts a String robot policy into an associative array, to allow
1023          * merging of several policies using array_merge().
1024          * @param array|string $policy Returns empty array on null/false/'', transparent
1025          *   to already-converted arrays, converts string.
1026          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1027          */
1028         public static function formatRobotPolicy( $policy ) {
1029                 if ( is_array( $policy ) ) {
1030                         return $policy;
1031                 } elseif ( !$policy ) {
1032                         return [];
1033                 }
1034
1035                 $policy = explode( ',', $policy );
1036                 $policy = array_map( 'trim', $policy );
1037
1038                 $arr = [];
1039                 foreach ( $policy as $var ) {
1040                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1041                                 $arr['index'] = $var;
1042                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1043                                 $arr['follow'] = $var;
1044                         }
1045                 }
1046
1047                 return $arr;
1048         }
1049
1050         /**
1051          * If this request is a redirect view, send "redirected from" subtitle to
1052          * the output. Returns true if the header was needed, false if this is not
1053          * a redirect view. Handles both local and remote redirects.
1054          *
1055          * @return bool
1056          */
1057         public function showRedirectedFromHeader() {
1058                 global $wgRedirectSources;
1059
1060                 $context = $this->getContext();
1061                 $outputPage = $context->getOutput();
1062                 $request = $context->getRequest();
1063                 $rdfrom = $request->getVal( 'rdfrom' );
1064
1065                 // Construct a URL for the current page view, but with the target title
1066                 $query = $request->getValues();
1067                 unset( $query['rdfrom'] );
1068                 unset( $query['title'] );
1069                 if ( $this->getTitle()->isRedirect() ) {
1070                         // Prevent double redirects
1071                         $query['redirect'] = 'no';
1072                 }
1073                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1074
1075                 if ( isset( $this->mRedirectedFrom ) ) {
1076                         // Avoid PHP 7.1 warning of passing $this by reference
1077                         $articlePage = $this;
1078
1079                         // This is an internally redirected page view.
1080                         // We'll need a backlink to the source page for navigation.
1081                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1082                                 $redir = Linker::linkKnown(
1083                                         $this->mRedirectedFrom,
1084                                         null,
1085                                         [],
1086                                         [ 'redirect' => 'no' ]
1087                                 );
1088
1089                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1090                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1091                                 . "</span>" );
1092
1093                                 // Add the script to update the displayed URL and
1094                                 // set the fragment if one was specified in the redirect
1095                                 $outputPage->addJsConfigVars( [
1096                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1097                                 ] );
1098                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1099
1100                                 // Add a <link rel="canonical"> tag
1101                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1102
1103                                 // Tell the output object that the user arrived at this article through a redirect
1104                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1105
1106                                 return true;
1107                         }
1108                 } elseif ( $rdfrom ) {
1109                         // This is an externally redirected view, from some other wiki.
1110                         // If it was reported from a trusted site, supply a backlink.
1111                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1112                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1113                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1114                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1115                                 . "</span>" );
1116
1117                                 // Add the script to update the displayed URL
1118                                 $outputPage->addJsConfigVars( [
1119                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1120                                 ] );
1121                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1122
1123                                 return true;
1124                         }
1125                 }
1126
1127                 return false;
1128         }
1129
1130         /**
1131          * Show a header specific to the namespace currently being viewed, like
1132          * [[MediaWiki:Talkpagetext]]. For Article::view().
1133          */
1134         public function showNamespaceHeader() {
1135                 if ( $this->getTitle()->isTalkPage() && !wfMessage( 'talkpageheader' )->isDisabled() ) {
1136                         $this->getContext()->getOutput()->wrapWikiMsg(
1137                                 "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1138                                 [ 'talkpageheader' ]
1139                         );
1140                 }
1141         }
1142
1143         /**
1144          * Show the footer section of an ordinary page view
1145          */
1146         public function showViewFooter() {
1147                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1148                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1149                         && IP::isValid( $this->getTitle()->getText() )
1150                 ) {
1151                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1152                 }
1153
1154                 // Show a footer allowing the user to patrol the shown revision or page if possible
1155                 $patrolFooterShown = $this->showPatrolFooter();
1156
1157                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1158         }
1159
1160         /**
1161          * If patrol is possible, output a patrol UI box. This is called from the
1162          * footer section of ordinary page views. If patrol is not possible or not
1163          * desired, does nothing.
1164          * Side effect: When the patrol link is build, this method will call
1165          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1166          *
1167          * @return bool
1168          */
1169         public function showPatrolFooter() {
1170                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1171
1172                 // Allow hooks to decide whether to not output this at all
1173                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1174                         return false;
1175                 }
1176
1177                 $outputPage = $this->getContext()->getOutput();
1178                 $user = $this->getContext()->getUser();
1179                 $title = $this->getTitle();
1180                 $rc = false;
1181
1182                 if ( !$title->quickUserCan( 'patrol', $user )
1183                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1184                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1185                 ) {
1186                         // Patrolling is disabled or the user isn't allowed to
1187                         return false;
1188                 }
1189
1190                 if ( $this->mRevision
1191                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1192                 ) {
1193                         // The current revision is already older than what could be in the RC table
1194                         // 6h tolerance because the RC might not be cleaned out regularly
1195                         return false;
1196                 }
1197
1198                 // Check for cached results
1199                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1200                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1201                 if ( $cache->get( $key ) ) {
1202                         return false;
1203                 }
1204
1205                 $dbr = wfGetDB( DB_REPLICA );
1206                 $oldestRevisionTimestamp = $dbr->selectField(
1207                         'revision',
1208                         'MIN( rev_timestamp )',
1209                         [ 'rev_page' => $title->getArticleID() ],
1210                         __METHOD__
1211                 );
1212
1213                 // New page patrol: Get the timestamp of the oldest revison which
1214                 // the revision table holds for the given page. Then we look
1215                 // whether it's within the RC lifespan and if it is, we try
1216                 // to get the recentchanges row belonging to that entry
1217                 // (with rc_new = 1).
1218                 $recentPageCreation = false;
1219                 if ( $oldestRevisionTimestamp
1220                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1221                 ) {
1222                         // 6h tolerance because the RC might not be cleaned out regularly
1223                         $recentPageCreation = true;
1224                         $rc = RecentChange::newFromConds(
1225                                 [
1226                                         'rc_new' => 1,
1227                                         'rc_timestamp' => $oldestRevisionTimestamp,
1228                                         'rc_namespace' => $title->getNamespace(),
1229                                         'rc_cur_id' => $title->getArticleID()
1230                                 ],
1231                                 __METHOD__
1232                         );
1233                         if ( $rc ) {
1234                                 // Use generic patrol message for new pages
1235                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1236                         }
1237                 }
1238
1239                 // File patrol: Get the timestamp of the latest upload for this page,
1240                 // check whether it is within the RC lifespan and if it is, we try
1241                 // to get the recentchanges row belonging to that entry
1242                 // (with rc_type = RC_LOG, rc_log_type = upload).
1243                 $recentFileUpload = false;
1244                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1245                         && $title->getNamespace() === NS_FILE ) {
1246                         // Retrieve timestamp of most recent upload
1247                         $newestUploadTimestamp = $dbr->selectField(
1248                                 'image',
1249                                 'MAX( img_timestamp )',
1250                                 [ 'img_name' => $title->getDBkey() ],
1251                                 __METHOD__
1252                         );
1253                         if ( $newestUploadTimestamp
1254                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1255                         ) {
1256                                 // 6h tolerance because the RC might not be cleaned out regularly
1257                                 $recentFileUpload = true;
1258                                 $rc = RecentChange::newFromConds(
1259                                         [
1260                                                 'rc_type' => RC_LOG,
1261                                                 'rc_log_type' => 'upload',
1262                                                 'rc_timestamp' => $newestUploadTimestamp,
1263                                                 'rc_namespace' => NS_FILE,
1264                                                 'rc_cur_id' => $title->getArticleID()
1265                                         ],
1266                                         __METHOD__
1267                                 );
1268                                 if ( $rc ) {
1269                                         // Use patrol message specific to files
1270                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1271                                 }
1272                         }
1273                 }
1274
1275                 if ( !$recentPageCreation && !$recentFileUpload ) {
1276                         // Page creation and latest upload (for files) is too old to be in RC
1277
1278                         // We definitely can't patrol so cache the information
1279                         // When a new file version is uploaded, the cache is cleared
1280                         $cache->set( $key, '1' );
1281
1282                         return false;
1283                 }
1284
1285                 if ( !$rc ) {
1286                         // Don't cache: This can be hit if the page gets accessed very fast after
1287                         // its creation / latest upload or in case we have high replica DB lag. In case
1288                         // the revision is too old, we will already return above.
1289                         return false;
1290                 }
1291
1292                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1293                         // Patrolled RC entry around
1294
1295                         // Cache the information we gathered above in case we can't patrol
1296                         // Don't cache in case we can patrol as this could change
1297                         $cache->set( $key, '1' );
1298
1299                         return false;
1300                 }
1301
1302                 if ( $rc->getPerformer()->equals( $user ) ) {
1303                         // Don't show a patrol link for own creations/uploads. If the user could
1304                         // patrol them, they already would be patrolled
1305                         return false;
1306                 }
1307
1308                 $outputPage->preventClickjacking();
1309                 if ( $user->isAllowed( 'writeapi' ) ) {
1310                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1311                 }
1312
1313                 $link = Linker::linkKnown(
1314                         $title,
1315                         $markPatrolledMsg->escaped(),
1316                         [],
1317                         [
1318                                 'action' => 'markpatrolled',
1319                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1320                         ]
1321                 );
1322
1323                 $outputPage->addHTML(
1324                         "<div class='patrollink' data-mw='interface'>" .
1325                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1326                         '</div>'
1327                 );
1328
1329                 return true;
1330         }
1331
1332         /**
1333          * Purge the cache used to check if it is worth showing the patrol footer
1334          * For example, it is done during re-uploads when file patrol is used.
1335          * @param int $articleID ID of the article to purge
1336          * @since 1.27
1337          */
1338         public static function purgePatrolFooterCache( $articleID ) {
1339                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1340                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1341         }
1342
1343         /**
1344          * Show the error text for a missing article. For articles in the MediaWiki
1345          * namespace, show the default message text. To be called from Article::view().
1346          */
1347         public function showMissingArticle() {
1348                 global $wgSend404Code;
1349
1350                 $outputPage = $this->getContext()->getOutput();
1351                 // Whether the page is a root user page of an existing user (but not a subpage)
1352                 $validUserPage = false;
1353
1354                 $title = $this->getTitle();
1355
1356                 $services = MediaWikiServices::getInstance();
1357
1358                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1359                 if ( $title->getNamespace() == NS_USER
1360                         || $title->getNamespace() == NS_USER_TALK
1361                 ) {
1362                         $rootPart = explode( '/', $title->getText() )[0];
1363                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1364                         $ip = User::isIP( $rootPart );
1365                         $block = DatabaseBlock::newFromTarget( $user, $user );
1366
1367                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1368                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1369                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1370                         } elseif (
1371                                 !is_null( $block ) &&
1372                                 $block->getType() != DatabaseBlock::TYPE_AUTO &&
1373                                 ( $block->isSitewide() || $user->isBlockedFrom( $title ) )
1374                         ) {
1375                                 // Show log extract if the user is sitewide blocked or is partially
1376                                 // blocked and not allowed to edit their user page or user talk page
1377                                 LogEventsList::showLogExtract(
1378                                         $outputPage,
1379                                         'block',
1380                                         $services->getNamespaceInfo()->getCanonicalName( NS_USER ) . ':' .
1381                                                 $block->getTarget(),
1382                                         '',
1383                                         [
1384                                                 'lim' => 1,
1385                                                 'showIfEmpty' => false,
1386                                                 'msgKey' => [
1387                                                         'blocked-notice-logextract',
1388                                                         $user->getName() # Support GENDER in notice
1389                                                 ]
1390                                         ]
1391                                 );
1392                                 $validUserPage = !$title->isSubpage();
1393                         } else {
1394                                 $validUserPage = !$title->isSubpage();
1395                         }
1396                 }
1397
1398                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1399
1400                 # Show delete and move logs if there were any such events.
1401                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1402                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1403                 $cache = $services->getMainObjectStash();
1404                 $key = $cache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1405                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1406                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1407                 if ( $loggedIn || $cache->get( $key ) || $sessionExists ) {
1408                         $logTypes = [ 'delete', 'move', 'protect' ];
1409
1410                         $dbr = wfGetDB( DB_REPLICA );
1411
1412                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1413                         // Give extensions a chance to hide their (unrelated) log entries
1414                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1415                         LogEventsList::showLogExtract(
1416                                 $outputPage,
1417                                 $logTypes,
1418                                 $title,
1419                                 '',
1420                                 [
1421                                         'lim' => 10,
1422                                         'conds' => $conds,
1423                                         'showIfEmpty' => false,
1424                                         'msgKey' => [ $loggedIn || $sessionExists
1425                                                 ? 'moveddeleted-notice'
1426                                                 : 'moveddeleted-notice-recent'
1427                                         ]
1428                                 ]
1429                         );
1430                 }
1431
1432                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1433                         // If there's no backing content, send a 404 Not Found
1434                         // for better machine handling of broken links.
1435                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1436                 }
1437
1438                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1439                 $policy = $this->getRobotPolicy( 'view' );
1440                 $outputPage->setIndexPolicy( $policy['index'] );
1441                 $outputPage->setFollowPolicy( $policy['follow'] );
1442
1443                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1444
1445                 if ( !$hookResult ) {
1446                         return;
1447                 }
1448
1449                 # Show error message
1450                 $oldid = $this->getOldID();
1451                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1452                         // use fake Content object for system message
1453                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1454                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1455                 } else {
1456                         if ( $oldid ) {
1457                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1458                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1459                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1460                         ) {
1461                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1462                                 $text = wfMessage( $message )->plain();
1463                         } else {
1464                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1465                         }
1466
1467                         $dir = $this->getContext()->getLanguage()->getDir();
1468                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1469                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1470                                 'class' => "noarticletext mw-content-$dir",
1471                                 'dir' => $dir,
1472                                 'lang' => $lang,
1473                         ] ) . "\n$text\n</div>" );
1474                 }
1475         }
1476
1477         /**
1478          * If the revision requested for view is deleted, check permissions.
1479          * Send either an error message or a warning header to the output.
1480          *
1481          * @return bool True if the view is allowed, false if not.
1482          */
1483         public function showDeletedRevisionHeader() {
1484                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1485                         // Not deleted
1486                         return true;
1487                 }
1488
1489                 $outputPage = $this->getContext()->getOutput();
1490                 $user = $this->getContext()->getUser();
1491                 // If the user is not allowed to see it...
1492                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1493                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1494                                 'rev-deleted-text-permission' );
1495
1496                         return false;
1497                 // If the user needs to confirm that they want to see it...
1498                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1499                         # Give explanation and add a link to view the revision...
1500                         $oldid = intval( $this->getOldID() );
1501                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1502                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1503                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1504                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1505                                 [ $msg, $link ] );
1506
1507                         return false;
1508                 // We are allowed to see...
1509                 } else {
1510                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1511                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1512                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1513
1514                         return true;
1515                 }
1516         }
1517
1518         /**
1519          * Generate the navigation links when browsing through an article revisions
1520          * It shows the information as:
1521          *   Revision as of \<date\>; view current revision
1522          *   \<- Previous version | Next Version -\>
1523          *
1524          * @param int $oldid Revision ID of this article revision
1525          */
1526         public function setOldSubtitle( $oldid = 0 ) {
1527                 // Avoid PHP 7.1 warning of passing $this by reference
1528                 $articlePage = $this;
1529
1530                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1531                         return;
1532                 }
1533
1534                 $context = $this->getContext();
1535                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1536
1537                 # Cascade unhide param in links for easy deletion browsing
1538                 $extraParams = [];
1539                 if ( $unhide ) {
1540                         $extraParams['unhide'] = 1;
1541                 }
1542
1543                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1544                         $revision = $this->mRevision;
1545                 } else {
1546                         $revision = Revision::newFromId( $oldid );
1547                 }
1548
1549                 $timestamp = $revision->getTimestamp();
1550
1551                 $current = ( $oldid == $this->mPage->getLatest() );
1552                 $language = $context->getLanguage();
1553                 $user = $context->getUser();
1554
1555                 $td = $language->userTimeAndDate( $timestamp, $user );
1556                 $tddate = $language->userDate( $timestamp, $user );
1557                 $tdtime = $language->userTime( $timestamp, $user );
1558
1559                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1560                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1561
1562                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1563                         ? 'revision-info-current'
1564                         : 'revision-info';
1565
1566                 $outputPage = $context->getOutput();
1567                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1568                         $context->msg( $infomsg, $td )
1569                                 ->rawParams( $userlinks )
1570                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1571                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1572                                 ->parse() .
1573                         "</div>";
1574
1575                 $lnk = $current
1576                         ? $context->msg( 'currentrevisionlink' )->escaped()
1577                         : Linker::linkKnown(
1578                                 $this->getTitle(),
1579                                 $context->msg( 'currentrevisionlink' )->escaped(),
1580                                 [],
1581                                 $extraParams
1582                         );
1583                 $curdiff = $current
1584                         ? $context->msg( 'diff' )->escaped()
1585                         : Linker::linkKnown(
1586                                 $this->getTitle(),
1587                                 $context->msg( 'diff' )->escaped(),
1588                                 [],
1589                                 [
1590                                         'diff' => 'cur',
1591                                         'oldid' => $oldid
1592                                 ] + $extraParams
1593                         );
1594                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1595                 $prevlink = $prev
1596                         ? Linker::linkKnown(
1597                                 $this->getTitle(),
1598                                 $context->msg( 'previousrevision' )->escaped(),
1599                                 [],
1600                                 [
1601                                         'direction' => 'prev',
1602                                         'oldid' => $oldid
1603                                 ] + $extraParams
1604                         )
1605                         : $context->msg( 'previousrevision' )->escaped();
1606                 $prevdiff = $prev
1607                         ? Linker::linkKnown(
1608                                 $this->getTitle(),
1609                                 $context->msg( 'diff' )->escaped(),
1610                                 [],
1611                                 [
1612                                         'diff' => 'prev',
1613                                         'oldid' => $oldid
1614                                 ] + $extraParams
1615                         )
1616                         : $context->msg( 'diff' )->escaped();
1617                 $nextlink = $current
1618                         ? $context->msg( 'nextrevision' )->escaped()
1619                         : Linker::linkKnown(
1620                                 $this->getTitle(),
1621                                 $context->msg( 'nextrevision' )->escaped(),
1622                                 [],
1623                                 [
1624                                         'direction' => 'next',
1625                                         'oldid' => $oldid
1626                                 ] + $extraParams
1627                         );
1628                 $nextdiff = $current
1629                         ? $context->msg( 'diff' )->escaped()
1630                         : Linker::linkKnown(
1631                                 $this->getTitle(),
1632                                 $context->msg( 'diff' )->escaped(),
1633                                 [],
1634                                 [
1635                                         'diff' => 'next',
1636                                         'oldid' => $oldid
1637                                 ] + $extraParams
1638                         );
1639
1640                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1641                 if ( $cdel !== '' ) {
1642                         $cdel .= ' ';
1643                 }
1644
1645                 // the outer div is need for styling the revision info and nav in MobileFrontend
1646                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1647                         "<div id=\"mw-revision-nav\">" . $cdel .
1648                         $context->msg( 'revision-nav' )->rawParams(
1649                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1650                         )->escaped() . "</div></div>" );
1651         }
1652
1653         /**
1654          * Return the HTML for the top of a redirect page
1655          *
1656          * Chances are you should just be using the ParserOutput from
1657          * WikitextContent::getParserOutput instead of calling this for redirects.
1658          *
1659          * @param Title|array $target Destination(s) to redirect
1660          * @param bool $appendSubtitle [optional]
1661          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1662          * @return string Containing HTML with redirect link
1663          *
1664          * @deprecated since 1.30
1665          */
1666         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1667                 $lang = $this->getTitle()->getPageLanguage();
1668                 $out = $this->getContext()->getOutput();
1669                 if ( $appendSubtitle ) {
1670                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1671                 }
1672                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1673                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1674         }
1675
1676         /**
1677          * Return the HTML for the top of a redirect page
1678          *
1679          * Chances are you should just be using the ParserOutput from
1680          * WikitextContent::getParserOutput instead of calling this for redirects.
1681          *
1682          * @since 1.23
1683          * @param Language $lang
1684          * @param Title|array $target Destination(s) to redirect
1685          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1686          * @return string Containing HTML with redirect link
1687          */
1688         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1689                 if ( !is_array( $target ) ) {
1690                         $target = [ $target ];
1691                 }
1692
1693                 $html = '<ul class="redirectText">';
1694                 /** @var Title $title */
1695                 foreach ( $target as $title ) {
1696                         $html .= '<li>' . Linker::link(
1697                                 $title,
1698                                 htmlspecialchars( $title->getFullText() ),
1699                                 [],
1700                                 // Make sure wiki page redirects are not followed
1701                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1702                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1703                         ) . '</li>';
1704                 }
1705                 $html .= '</ul>';
1706
1707                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1708
1709                 return '<div class="redirectMsg">' .
1710                         '<p>' . $redirectToText . '</p>' .
1711                         $html .
1712                         '</div>';
1713         }
1714
1715         /**
1716          * Adds help link with an icon via page indicators.
1717          * Link target can be overridden by a local message containing a wikilink:
1718          * the message key is: 'namespace-' + namespace number + '-helppage'.
1719          * @param string $to Target MediaWiki.org page title or encoded URL.
1720          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1721          * @since 1.25
1722          */
1723         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1724                 $msg = wfMessage(
1725                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1726                 );
1727
1728                 $out = $this->getContext()->getOutput();
1729                 if ( !$msg->isDisabled() ) {
1730                         $helpUrl = Skin::makeUrl( $msg->plain() );
1731                         $out->addHelpLink( $helpUrl, true );
1732                 } else {
1733                         $out->addHelpLink( $to, $overrideBaseUrl );
1734                 }
1735         }
1736
1737         /**
1738          * Handle action=render
1739          */
1740         public function render() {
1741                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1742                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1743                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1744                 $this->viewIsRenderAction = true;
1745                 $this->view();
1746         }
1747
1748         /**
1749          * action=protect handler
1750          */
1751         public function protect() {
1752                 $form = new ProtectionForm( $this );
1753                 $form->execute();
1754         }
1755
1756         /**
1757          * action=unprotect handler (alias)
1758          */
1759         public function unprotect() {
1760                 $this->protect();
1761         }
1762
1763         /**
1764          * UI entry point for page deletion
1765          */
1766         public function delete() {
1767                 # This code desperately needs to be totally rewritten
1768
1769                 $title = $this->getTitle();
1770                 $context = $this->getContext();
1771                 $user = $context->getUser();
1772                 $request = $context->getRequest();
1773
1774                 # Check permissions
1775                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1776                 if ( count( $permissionErrors ) ) {
1777                         throw new PermissionsError( 'delete', $permissionErrors );
1778                 }
1779
1780                 # Read-only check...
1781                 if ( wfReadOnly() ) {
1782                         throw new ReadOnlyError;
1783                 }
1784
1785                 # Better double-check that it hasn't been deleted yet!
1786                 $this->mPage->loadPageData(
1787                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1788                 );
1789                 if ( !$this->mPage->exists() ) {
1790                         $deleteLogPage = new LogPage( 'delete' );
1791                         $outputPage = $context->getOutput();
1792                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1793                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1794                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1795                                 );
1796                         $outputPage->addHTML(
1797                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1798                         );
1799                         LogEventsList::showLogExtract(
1800                                 $outputPage,
1801                                 'delete',
1802                                 $title
1803                         );
1804
1805                         return;
1806                 }
1807
1808                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1809                 $deleteReason = $request->getText( 'wpReason' );
1810
1811                 if ( $deleteReasonList == 'other' ) {
1812                         $reason = $deleteReason;
1813                 } elseif ( $deleteReason != '' ) {
1814                         // Entry from drop down menu + additional comment
1815                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1816                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1817                 } else {
1818                         $reason = $deleteReasonList;
1819                 }
1820
1821                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1822                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1823                 ) {
1824                         # Flag to hide all contents of the archived revisions
1825                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1826
1827                         $this->doDelete( $reason, $suppress );
1828
1829                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1830
1831                         return;
1832                 }
1833
1834                 // Generate deletion reason
1835                 $hasHistory = false;
1836                 if ( !$reason ) {
1837                         try {
1838                                 $reason = $this->generateReason( $hasHistory );
1839                         } catch ( Exception $e ) {
1840                                 # if a page is horribly broken, we still want to be able to
1841                                 # delete it. So be lenient about errors here.
1842                                 wfDebug( "Error while building auto delete summary: $e" );
1843                                 $reason = '';
1844                         }
1845                 }
1846
1847                 // If the page has a history, insert a warning
1848                 if ( $hasHistory ) {
1849                         $title = $this->getTitle();
1850
1851                         // The following can use the real revision count as this is only being shown for users
1852                         // that can delete this page.
1853                         // This, as a side-effect, also makes sure that the following query isn't being run for
1854                         // pages with a larger history, unless the user has the 'bigdelete' right
1855                         // (and is about to delete this page).
1856                         $dbr = wfGetDB( DB_REPLICA );
1857                         $revisions = $edits = (int)$dbr->selectField(
1858                                 'revision',
1859                                 'COUNT(rev_page)',
1860                                 [ 'rev_page' => $title->getArticleID() ],
1861                                 __METHOD__
1862                         );
1863
1864                         // @todo i18n issue/patchwork message
1865                         $context->getOutput()->addHTML(
1866                                 '<strong class="mw-delete-warning-revisions">' .
1867                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1868                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1869                                         $context->msg( 'history' )->escaped(),
1870                                         [],
1871                                         [ 'action' => 'history' ] ) .
1872                                 '</strong>'
1873                         );
1874
1875                         if ( $title->isBigDeletion() ) {
1876                                 global $wgDeleteRevisionsLimit;
1877                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1878                                         [
1879                                                 'delete-warning-toobig',
1880                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1881                                         ]
1882                                 );
1883                         }
1884                 }
1885
1886                 $this->confirmDelete( $reason );
1887         }
1888
1889         /**
1890          * Output deletion confirmation dialog
1891          * @todo Move to another file?
1892          * @param string $reason Prefilled reason
1893          */
1894         public function confirmDelete( $reason ) {
1895                 wfDebug( "Article::confirmDelete\n" );
1896
1897                 $title = $this->getTitle();
1898                 $ctx = $this->getContext();
1899                 $outputPage = $ctx->getOutput();
1900                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1901                 $outputPage->addBacklinkSubtitle( $title );
1902                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1903                 $outputPage->addModules( 'mediawiki.action.delete' );
1904
1905                 $backlinkCache = $title->getBacklinkCache();
1906                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1907                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1908                                 'deleting-backlinks-warning' );
1909                 }
1910
1911                 $subpageQueryLimit = 51;
1912                 $subpages = $title->getSubpages( $subpageQueryLimit );
1913                 $subpageCount = count( $subpages );
1914                 if ( $subpageCount > 0 ) {
1915                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1916                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1917                 }
1918                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1919
1920                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1921
1922                 $user = $this->getContext()->getUser();
1923                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1924
1925                 $outputPage->enableOOUI();
1926
1927                 $options = Xml::listDropDownOptions(
1928                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1929                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1930                 );
1931                 $options = Xml::listDropDownOptionsOoui( $options );
1932
1933                 $fields[] = new OOUI\FieldLayout(
1934                         new OOUI\DropdownInputWidget( [
1935                                 'name' => 'wpDeleteReasonList',
1936                                 'inputId' => 'wpDeleteReasonList',
1937                                 'tabIndex' => 1,
1938                                 'infusable' => true,
1939                                 'value' => '',
1940                                 'options' => $options
1941                         ] ),
1942                         [
1943                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1944                                 'align' => 'top',
1945                         ]
1946                 );
1947
1948                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1949                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1950                 // Unicode codepoints.
1951                 $fields[] = new OOUI\FieldLayout(
1952                         new OOUI\TextInputWidget( [
1953                                 'name' => 'wpReason',
1954                                 'inputId' => 'wpReason',
1955                                 'tabIndex' => 2,
1956                                 'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
1957                                 'infusable' => true,
1958                                 'value' => $reason,
1959                                 'autofocus' => true,
1960                         ] ),
1961                         [
1962                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1963                                 'align' => 'top',
1964                         ]
1965                 );
1966
1967                 if ( $user->isLoggedIn() ) {
1968                         $fields[] = new OOUI\FieldLayout(
1969                                 new OOUI\CheckboxInputWidget( [
1970                                         'name' => 'wpWatch',
1971                                         'inputId' => 'wpWatch',
1972                                         'tabIndex' => 3,
1973                                         'selected' => $checkWatch,
1974                                 ] ),
1975                                 [
1976                                         'label' => $ctx->msg( 'watchthis' )->text(),
1977                                         'align' => 'inline',
1978                                         'infusable' => true,
1979                                 ]
1980                         );
1981                 }
1982
1983                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1984                         $fields[] = new OOUI\FieldLayout(
1985                                 new OOUI\CheckboxInputWidget( [
1986                                         'name' => 'wpSuppress',
1987                                         'inputId' => 'wpSuppress',
1988                                         'tabIndex' => 4,
1989                                 ] ),
1990                                 [
1991                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1992                                         'align' => 'inline',
1993                                         'infusable' => true,
1994                                 ]
1995                         );
1996                 }
1997
1998                 $fields[] = new OOUI\FieldLayout(
1999                         new OOUI\ButtonInputWidget( [
2000                                 'name' => 'wpConfirmB',
2001                                 'inputId' => 'wpConfirmB',
2002                                 'tabIndex' => 5,
2003                                 'value' => $ctx->msg( 'deletepage' )->text(),
2004                                 'label' => $ctx->msg( 'deletepage' )->text(),
2005                                 'flags' => [ 'primary', 'destructive' ],
2006                                 'type' => 'submit',
2007                         ] ),
2008                         [
2009                                 'align' => 'top',
2010                         ]
2011                 );
2012
2013                 $fieldset = new OOUI\FieldsetLayout( [
2014                         'label' => $ctx->msg( 'delete-legend' )->text(),
2015                         'id' => 'mw-delete-table',
2016                         'items' => $fields,
2017                 ] );
2018
2019                 $form = new OOUI\FormLayout( [
2020                         'method' => 'post',
2021                         'action' => $title->getLocalURL( 'action=delete' ),
2022                         'id' => 'deleteconfirm',
2023                 ] );
2024                 $form->appendContent(
2025                         $fieldset,
2026                         new OOUI\HtmlSnippet(
2027                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2028                         )
2029                 );
2030
2031                 $outputPage->addHTML(
2032                         new OOUI\PanelLayout( [
2033                                 'classes' => [ 'deletepage-wrapper' ],
2034                                 'expanded' => false,
2035                                 'padded' => true,
2036                                 'framed' => true,
2037                                 'content' => $form,
2038                         ] )
2039                 );
2040
2041                 if ( $user->isAllowed( 'editinterface' ) ) {
2042                         $link = Linker::linkKnown(
2043                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2044                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2045                                 [],
2046                                 [ 'action' => 'edit' ]
2047                         );
2048                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2049                 }
2050
2051                 $deleteLogPage = new LogPage( 'delete' );
2052                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2053                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2054         }
2055
2056         /**
2057          * Perform a deletion and output success or failure messages
2058          * @param string $reason
2059          * @param bool $suppress
2060          * @param bool $immediate false allows deleting over time via the job queue
2061          * @throws FatalError
2062          * @throws MWException
2063          */
2064         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2065                 $error = '';
2066                 $context = $this->getContext();
2067                 $outputPage = $context->getOutput();
2068                 $user = $context->getUser();
2069                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2070                         [], 'delete', $immediate );
2071
2072                 if ( $status->isOK() ) {
2073                         $deleted = $this->getTitle()->getPrefixedText();
2074
2075                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2076                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2077
2078                         if ( $status->isGood() ) {
2079                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2080                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2081                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2082                         } else {
2083                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2084                         }
2085
2086                         $outputPage->returnToMain( false );
2087                 } else {
2088                         $outputPage->setPageTitle(
2089                                 wfMessage( 'cannotdelete-title',
2090                                         $this->getTitle()->getPrefixedText() )
2091                         );
2092
2093                         if ( $error == '' ) {
2094                                 $outputPage->wrapWikiTextAsInterface(
2095                                         'error mw-error-cannotdelete',
2096                                         $status->getWikiText()
2097                                 );
2098                                 $deleteLogPage = new LogPage( 'delete' );
2099                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2100
2101                                 LogEventsList::showLogExtract(
2102                                         $outputPage,
2103                                         'delete',
2104                                         $this->getTitle()
2105                                 );
2106                         } else {
2107                                 $outputPage->addHTML( $error );
2108                         }
2109                 }
2110         }
2111
2112         /* Caching functions */
2113
2114         /**
2115          * checkLastModified returns true if it has taken care of all
2116          * output to the client that is necessary for this request.
2117          * (that is, it has sent a cached version of the page)
2118          *
2119          * @return bool True if cached version send, false otherwise
2120          */
2121         protected function tryFileCache() {
2122                 static $called = false;
2123
2124                 if ( $called ) {
2125                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2126                         return false;
2127                 }
2128
2129                 $called = true;
2130                 if ( $this->isFileCacheable() ) {
2131                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2132                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2133                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2134                                 $cache->loadFromFileCache( $this->getContext() );
2135                                 return true;
2136                         } else {
2137                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2138                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2139                         }
2140                 } else {
2141                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2142                 }
2143
2144                 return false;
2145         }
2146
2147         /**
2148          * Check if the page can be cached
2149          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2150          * @return bool
2151          */
2152         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2153                 $cacheable = false;
2154
2155                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2156                         $cacheable = $this->mPage->getId()
2157                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2158                         // Extension may have reason to disable file caching on some pages.
2159                         if ( $cacheable ) {
2160                                 // Avoid PHP 7.1 warning of passing $this by reference
2161                                 $articlePage = $this;
2162                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2163                         }
2164                 }
2165
2166                 return $cacheable;
2167         }
2168
2169         /**#@-*/
2170
2171         /**
2172          * Lightweight method to get the parser output for a page, checking the parser cache
2173          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2174          * consider, so it's not appropriate to use there.
2175          *
2176          * @since 1.16 (r52326) for LiquidThreads
2177          *
2178          * @param int|null $oldid Revision ID or null
2179          * @param User|null $user The relevant user
2180          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2181          */
2182         public function getParserOutput( $oldid = null, User $user = null ) {
2183                 // XXX: bypasses mParserOptions and thus setParserOptions()
2184
2185                 if ( $user === null ) {
2186                         $parserOptions = $this->getParserOptions();
2187                 } else {
2188                         $parserOptions = $this->mPage->makeParserOptions( $user );
2189                 }
2190
2191                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2192         }
2193
2194         /**
2195          * Override the ParserOptions used to render the primary article wikitext.
2196          *
2197          * @param ParserOptions $options
2198          * @throws MWException If the parser options where already initialized.
2199          */
2200         public function setParserOptions( ParserOptions $options ) {
2201                 if ( $this->mParserOptions ) {
2202                         throw new MWException( "can't change parser options after they have already been set" );
2203                 }
2204
2205                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2206                 $this->mParserOptions = clone $options;
2207         }
2208
2209         /**
2210          * Get parser options suitable for rendering the primary article wikitext
2211          * @return ParserOptions
2212          */
2213         public function getParserOptions() {
2214                 if ( !$this->mParserOptions ) {
2215                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2216                 }
2217                 // Clone to allow modifications of the return value without affecting cache
2218                 return clone $this->mParserOptions;
2219         }
2220
2221         /**
2222          * Sets the context this Article is executed in
2223          *
2224          * @param IContextSource $context
2225          * @since 1.18
2226          */
2227         public function setContext( $context ) {
2228                 $this->mContext = $context;
2229         }
2230
2231         /**
2232          * Gets the context this Article is executed in
2233          *
2234          * @return IContextSource
2235          * @since 1.18
2236          */
2237         public function getContext() {
2238                 if ( $this->mContext instanceof IContextSource ) {
2239                         return $this->mContext;
2240                 } else {
2241                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2242                                 "Return RequestContext::getMain(); for sanity\n" );
2243                         return RequestContext::getMain();
2244                 }
2245         }
2246
2247         /**
2248          * Use PHP's magic __get handler to handle accessing of
2249          * raw WikiPage fields for backwards compatibility.
2250          *
2251          * @param string $fname Field name
2252          * @return mixed
2253          */
2254         public function __get( $fname ) {
2255                 if ( property_exists( $this->mPage, $fname ) ) {
2256                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2257                         return $this->mPage->$fname;
2258                 }
2259                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2260         }
2261
2262         /**
2263          * Use PHP's magic __set handler to handle setting of
2264          * raw WikiPage fields for backwards compatibility.
2265          *
2266          * @param string $fname Field name
2267          * @param mixed $fvalue New value
2268          */
2269         public function __set( $fname, $fvalue ) {
2270                 if ( property_exists( $this->mPage, $fname ) ) {
2271                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2272                         $this->mPage->$fname = $fvalue;
2273                 // Note: extensions may want to toss on new fields
2274                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2275                         $this->mPage->$fname = $fvalue;
2276                 } else {
2277                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2278                 }
2279         }
2280
2281         /**
2282          * Call to WikiPage function for backwards compatibility.
2283          * @see WikiPage::checkFlags
2284          */
2285         public function checkFlags( $flags ) {
2286                 return $this->mPage->checkFlags( $flags );
2287         }
2288
2289         /**
2290          * Call to WikiPage function for backwards compatibility.
2291          * @see WikiPage::checkTouched
2292          */
2293         public function checkTouched() {
2294                 return $this->mPage->checkTouched();
2295         }
2296
2297         /**
2298          * Call to WikiPage function for backwards compatibility.
2299          * @see WikiPage::clearPreparedEdit
2300          */
2301         public function clearPreparedEdit() {
2302                 $this->mPage->clearPreparedEdit();
2303         }
2304
2305         /**
2306          * Call to WikiPage function for backwards compatibility.
2307          * @see WikiPage::doDeleteArticleReal
2308          */
2309         public function doDeleteArticleReal(
2310                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2311                 $tags = [], $immediate = false
2312         ) {
2313                 return $this->mPage->doDeleteArticleReal(
2314                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2315                 );
2316         }
2317
2318         /**
2319          * Call to WikiPage function for backwards compatibility.
2320          * @see WikiPage::doDeleteUpdates
2321          */
2322         public function doDeleteUpdates(
2323                 $id,
2324                 Content $content = null,
2325                 $revision = null,
2326                 User $user = null
2327         ) {
2328                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2329         }
2330
2331         /**
2332          * Call to WikiPage function for backwards compatibility.
2333          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2334          * @see WikiPage::doEditContent
2335          */
2336         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2337                 User $user = null, $serialFormat = null
2338         ) {
2339                 wfDeprecated( __METHOD__, '1.29' );
2340                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2341                         $user, $serialFormat
2342                 );
2343         }
2344
2345         /**
2346          * Call to WikiPage function for backwards compatibility.
2347          * @see WikiPage::doEditUpdates
2348          */
2349         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2350                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2351         }
2352
2353         /**
2354          * Call to WikiPage function for backwards compatibility.
2355          * @see WikiPage::doPurge
2356          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2357          *  controlled how much purging was done.
2358          */
2359         public function doPurge() {
2360                 return $this->mPage->doPurge();
2361         }
2362
2363         /**
2364          * Call to WikiPage function for backwards compatibility.
2365          * @see WikiPage::doViewUpdates
2366          */
2367         public function doViewUpdates( User $user, $oldid = 0 ) {
2368                 $this->mPage->doViewUpdates( $user, $oldid );
2369         }
2370
2371         /**
2372          * Call to WikiPage function for backwards compatibility.
2373          * @see WikiPage::exists
2374          */
2375         public function exists() {
2376                 return $this->mPage->exists();
2377         }
2378
2379         /**
2380          * Call to WikiPage function for backwards compatibility.
2381          * @see WikiPage::followRedirect
2382          */
2383         public function followRedirect() {
2384                 return $this->mPage->followRedirect();
2385         }
2386
2387         /**
2388          * Call to WikiPage function for backwards compatibility.
2389          * @see ContentHandler::getActionOverrides
2390          */
2391         public function getActionOverrides() {
2392                 return $this->mPage->getActionOverrides();
2393         }
2394
2395         /**
2396          * Call to WikiPage function for backwards compatibility.
2397          * @see WikiPage::getAutoDeleteReason
2398          */
2399         public function getAutoDeleteReason( &$hasHistory ) {
2400                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2401         }
2402
2403         /**
2404          * Call to WikiPage function for backwards compatibility.
2405          * @see WikiPage::getCategories
2406          */
2407         public function getCategories() {
2408                 return $this->mPage->getCategories();
2409         }
2410
2411         /**
2412          * Call to WikiPage function for backwards compatibility.
2413          * @see WikiPage::getComment
2414          */
2415         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2416                 return $this->mPage->getComment( $audience, $user );
2417         }
2418
2419         /**
2420          * Call to WikiPage function for backwards compatibility.
2421          * @see WikiPage::getContentHandler
2422          */
2423         public function getContentHandler() {
2424                 return $this->mPage->getContentHandler();
2425         }
2426
2427         /**
2428          * Call to WikiPage function for backwards compatibility.
2429          * @see WikiPage::getContentModel
2430          */
2431         public function getContentModel() {
2432                 return $this->mPage->getContentModel();
2433         }
2434
2435         /**
2436          * Call to WikiPage function for backwards compatibility.
2437          * @see WikiPage::getContributors
2438          */
2439         public function getContributors() {
2440                 return $this->mPage->getContributors();
2441         }
2442
2443         /**
2444          * Call to WikiPage function for backwards compatibility.
2445          * @see WikiPage::getCreator
2446          */
2447         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2448                 return $this->mPage->getCreator( $audience, $user );
2449         }
2450
2451         /**
2452          * Call to WikiPage function for backwards compatibility.
2453          * @see WikiPage::getDeletionUpdates
2454          */
2455         public function getDeletionUpdates( Content $content = null ) {
2456                 return $this->mPage->getDeletionUpdates( $content );
2457         }
2458
2459         /**
2460          * Call to WikiPage function for backwards compatibility.
2461          * @see WikiPage::getHiddenCategories
2462          */
2463         public function getHiddenCategories() {
2464                 return $this->mPage->getHiddenCategories();
2465         }
2466
2467         /**
2468          * Call to WikiPage function for backwards compatibility.
2469          * @see WikiPage::getId
2470          */
2471         public function getId() {
2472                 return $this->mPage->getId();
2473         }
2474
2475         /**
2476          * Call to WikiPage function for backwards compatibility.
2477          * @see WikiPage::getLatest
2478          */
2479         public function getLatest() {
2480                 return $this->mPage->getLatest();
2481         }
2482
2483         /**
2484          * Call to WikiPage function for backwards compatibility.
2485          * @see WikiPage::getLinksTimestamp
2486          */
2487         public function getLinksTimestamp() {
2488                 return $this->mPage->getLinksTimestamp();
2489         }
2490
2491         /**
2492          * Call to WikiPage function for backwards compatibility.
2493          * @see WikiPage::getMinorEdit
2494          */
2495         public function getMinorEdit() {
2496                 return $this->mPage->getMinorEdit();
2497         }
2498
2499         /**
2500          * Call to WikiPage function for backwards compatibility.
2501          * @see WikiPage::getOldestRevision
2502          */
2503         public function getOldestRevision() {
2504                 return $this->mPage->getOldestRevision();
2505         }
2506
2507         /**
2508          * Call to WikiPage function for backwards compatibility.
2509          * @see WikiPage::getRedirectTarget
2510          */
2511         public function getRedirectTarget() {
2512                 return $this->mPage->getRedirectTarget();
2513         }
2514
2515         /**
2516          * Call to WikiPage function for backwards compatibility.
2517          * @see WikiPage::getRedirectURL
2518          */
2519         public function getRedirectURL( $rt ) {
2520                 return $this->mPage->getRedirectURL( $rt );
2521         }
2522
2523         /**
2524          * Call to WikiPage function for backwards compatibility.
2525          * @see WikiPage::getRevision
2526          */
2527         public function getRevision() {
2528                 return $this->mPage->getRevision();
2529         }
2530
2531         /**
2532          * Call to WikiPage function for backwards compatibility.
2533          * @see WikiPage::getTimestamp
2534          */
2535         public function getTimestamp() {
2536                 return $this->mPage->getTimestamp();
2537         }
2538
2539         /**
2540          * Call to WikiPage function for backwards compatibility.
2541          * @see WikiPage::getTouched
2542          */
2543         public function getTouched() {
2544                 return $this->mPage->getTouched();
2545         }
2546
2547         /**
2548          * Call to WikiPage function for backwards compatibility.
2549          * @see WikiPage::getUndoContent
2550          */
2551         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2552                 return $this->mPage->getUndoContent( $undo, $undoafter );
2553         }
2554
2555         /**
2556          * Call to WikiPage function for backwards compatibility.
2557          * @see WikiPage::getUser
2558          */
2559         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2560                 return $this->mPage->getUser( $audience, $user );
2561         }
2562
2563         /**
2564          * Call to WikiPage function for backwards compatibility.
2565          * @see WikiPage::getUserText
2566          */
2567         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2568                 return $this->mPage->getUserText( $audience, $user );
2569         }
2570
2571         /**
2572          * Call to WikiPage function for backwards compatibility.
2573          * @see WikiPage::hasViewableContent
2574          */
2575         public function hasViewableContent() {
2576                 return $this->mPage->hasViewableContent();
2577         }
2578
2579         /**
2580          * Call to WikiPage function for backwards compatibility.
2581          * @see WikiPage::insertOn
2582          */
2583         public function insertOn( $dbw, $pageId = null ) {
2584                 return $this->mPage->insertOn( $dbw, $pageId );
2585         }
2586
2587         /**
2588          * Call to WikiPage function for backwards compatibility.
2589          * @see WikiPage::insertProtectNullRevision
2590          */
2591         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2592                 array $expiry, $cascade, $reason, $user = null
2593         ) {
2594                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2595                         $expiry, $cascade, $reason, $user
2596                 );
2597         }
2598
2599         /**
2600          * Call to WikiPage function for backwards compatibility.
2601          * @see WikiPage::insertRedirect
2602          */
2603         public function insertRedirect() {
2604                 return $this->mPage->insertRedirect();
2605         }
2606
2607         /**
2608          * Call to WikiPage function for backwards compatibility.
2609          * @see WikiPage::insertRedirectEntry
2610          */
2611         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2612                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2613         }
2614
2615         /**
2616          * Call to WikiPage function for backwards compatibility.
2617          * @see WikiPage::isCountable
2618          */
2619         public function isCountable( $editInfo = false ) {
2620                 return $this->mPage->isCountable( $editInfo );
2621         }
2622
2623         /**
2624          * Call to WikiPage function for backwards compatibility.
2625          * @see WikiPage::isRedirect
2626          */
2627         public function isRedirect() {
2628                 return $this->mPage->isRedirect();
2629         }
2630
2631         /**
2632          * Call to WikiPage function for backwards compatibility.
2633          * @see WikiPage::loadFromRow
2634          */
2635         public function loadFromRow( $data, $from ) {
2636                 return $this->mPage->loadFromRow( $data, $from );
2637         }
2638
2639         /**
2640          * Call to WikiPage function for backwards compatibility.
2641          * @see WikiPage::loadPageData
2642          */
2643         public function loadPageData( $from = 'fromdb' ) {
2644                 $this->mPage->loadPageData( $from );
2645         }
2646
2647         /**
2648          * Call to WikiPage function for backwards compatibility.
2649          * @see WikiPage::lockAndGetLatest
2650          */
2651         public function lockAndGetLatest() {
2652                 return $this->mPage->lockAndGetLatest();
2653         }
2654
2655         /**
2656          * Call to WikiPage function for backwards compatibility.
2657          * @see WikiPage::makeParserOptions
2658          */
2659         public function makeParserOptions( $context ) {
2660                 return $this->mPage->makeParserOptions( $context );
2661         }
2662
2663         /**
2664          * Call to WikiPage function for backwards compatibility.
2665          * @see WikiPage::pageDataFromId
2666          */
2667         public function pageDataFromId( $dbr, $id, $options = [] ) {
2668                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2669         }
2670
2671         /**
2672          * Call to WikiPage function for backwards compatibility.
2673          * @see WikiPage::pageDataFromTitle
2674          */
2675         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2676                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2677         }
2678
2679         /**
2680          * Call to WikiPage function for backwards compatibility.
2681          * @see WikiPage::prepareContentForEdit
2682          */
2683         public function prepareContentForEdit(
2684                 Content $content, $revision = null, User $user = null,
2685                 $serialFormat = null, $useCache = true
2686         ) {
2687                 return $this->mPage->prepareContentForEdit(
2688                         $content, $revision, $user,
2689                         $serialFormat, $useCache
2690                 );
2691         }
2692
2693         /**
2694          * Call to WikiPage function for backwards compatibility.
2695          * @see WikiPage::protectDescription
2696          */
2697         public function protectDescription( array $limit, array $expiry ) {
2698                 return $this->mPage->protectDescription( $limit, $expiry );
2699         }
2700
2701         /**
2702          * Call to WikiPage function for backwards compatibility.
2703          * @see WikiPage::protectDescriptionLog
2704          */
2705         public function protectDescriptionLog( array $limit, array $expiry ) {
2706                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2707         }
2708
2709         /**
2710          * Call to WikiPage function for backwards compatibility.
2711          * @see WikiPage::replaceSectionAtRev
2712          */
2713         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2714                 $sectionTitle = '', $baseRevId = null
2715         ) {
2716                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2717                         $sectionTitle, $baseRevId
2718                 );
2719         }
2720
2721         /**
2722          * Call to WikiPage function for backwards compatibility.
2723          * @see WikiPage::replaceSectionContent
2724          */
2725         public function replaceSectionContent(
2726                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2727         ) {
2728                 return $this->mPage->replaceSectionContent(
2729                         $sectionId, $sectionContent, $sectionTitle, $edittime
2730                 );
2731         }
2732
2733         /**
2734          * Call to WikiPage function for backwards compatibility.
2735          * @see WikiPage::setTimestamp
2736          */
2737         public function setTimestamp( $ts ) {
2738                 $this->mPage->setTimestamp( $ts );
2739         }
2740
2741         /**
2742          * Call to WikiPage function for backwards compatibility.
2743          * @see WikiPage::shouldCheckParserCache
2744          */
2745         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2746                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2747         }
2748
2749         /**
2750          * Call to WikiPage function for backwards compatibility.
2751          * @see WikiPage::supportsSections
2752          */
2753         public function supportsSections() {
2754                 return $this->mPage->supportsSections();
2755         }
2756
2757         /**
2758          * Call to WikiPage function for backwards compatibility.
2759          * @see WikiPage::triggerOpportunisticLinksUpdate
2760          */
2761         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2762                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2763         }
2764
2765         /**
2766          * Call to WikiPage function for backwards compatibility.
2767          * @see WikiPage::updateCategoryCounts
2768          */
2769         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2770                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2771         }
2772
2773         /**
2774          * Call to WikiPage function for backwards compatibility.
2775          * @see WikiPage::updateIfNewerOn
2776          */
2777         public function updateIfNewerOn( $dbw, $revision ) {
2778                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2779         }
2780
2781         /**
2782          * Call to WikiPage function for backwards compatibility.
2783          * @see WikiPage::updateRedirectOn
2784          */
2785         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2786                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2787         }
2788
2789         /**
2790          * Call to WikiPage function for backwards compatibility.
2791          * @see WikiPage::updateRevisionOn
2792          */
2793         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2794                 $lastRevIsRedirect = null
2795         ) {
2796                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2797                         $lastRevIsRedirect
2798                 );
2799         }
2800
2801         /**
2802          * @param array $limit
2803          * @param array $expiry
2804          * @param bool &$cascade
2805          * @param string $reason
2806          * @param User $user
2807          * @return Status
2808          */
2809         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2810                 $reason, User $user
2811         ) {
2812                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2813         }
2814
2815         /**
2816          * @param array $limit
2817          * @param string $reason
2818          * @param int &$cascade
2819          * @param array $expiry
2820          * @return bool
2821          */
2822         public function updateRestrictions( $limit = [], $reason = '',
2823                 &$cascade = 0, $expiry = []
2824         ) {
2825                 return $this->mPage->doUpdateRestrictions(
2826                         $limit,
2827                         $expiry,
2828                         $cascade,
2829                         $reason,
2830                         $this->getContext()->getUser()
2831                 );
2832         }
2833
2834         /**
2835          * @param string $reason
2836          * @param bool $suppress
2837          * @param int|null $u1 Unused
2838          * @param bool|null $u2 Unused
2839          * @param string &$error
2840          * @param bool $immediate false allows deleting over time via the job queue
2841          * @return bool
2842          * @throws FatalError
2843          * @throws MWException
2844          */
2845         public function doDeleteArticle(
2846                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2847         ) {
2848                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2849                         null, $immediate );
2850         }
2851
2852         /**
2853          * @param string $fromP
2854          * @param string $summary
2855          * @param string $token
2856          * @param bool $bot
2857          * @param array &$resultDetails
2858          * @param User|null $user
2859          * @return array
2860          */
2861         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2862                 if ( !$user ) {
2863                         $user = $this->getContext()->getUser();
2864                 }
2865
2866                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2867         }
2868
2869         /**
2870          * @param string $fromP
2871          * @param string $summary
2872          * @param bool $bot
2873          * @param array &$resultDetails
2874          * @param User|null $guser
2875          * @return array
2876          */
2877         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2878                 if ( !$guser ) {
2879                         $guser = $this->getContext()->getUser();
2880                 }
2881
2882                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2883         }
2884
2885         /**
2886          * @param bool &$hasHistory
2887          * @return mixed
2888          */
2889         public function generateReason( &$hasHistory ) {
2890                 $title = $this->mPage->getTitle();
2891                 $handler = ContentHandler::getForTitle( $title );
2892                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2893         }
2894
2895         // ******
2896 }