includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Revision\MutableRevisionRecord;
  24 use MediaWiki\Revision\RevisionRecord;
  25 use MediaWiki\Revision\SlotRecord;
  26
  27 /**
  28  * Class for viewing MediaWiki article and history.
  29  *
  30  * This maintains WikiPage functions for backwards compatibility.
  31  *
  32  * @todo Move and rewrite code to an Action class
  33  *
  34  * See design.txt for an overview.
  35  * Note: edit user interface and cache support functions have been
  36  * moved to separate EditPage and HTMLFileCache classes.
  37  */
  38 class Article implements Page {
  39         /**
  40          * @var IContextSource|null The context this Article is executed in.
  41          * If null, RequestContext::getMain() is used.
  42          */
  43         protected $mContext;
  44
  45         /** @var WikiPage|null The WikiPage object of this instance */
  46         protected $mPage;
  47
  48         /**
  49          * @var ParserOptions|null ParserOptions object for $wgUser articles.
  50          * Initialized by getParserOptions by calling $this->mPage->makeParserOptions().
  51          */
  52         public $mParserOptions;
  53
  54         /**
  55          * @var Content|null Content of the main slot of $this->mRevision.
  56          * @note This variable is read only, setting it has no effect.
  57          *       Extensions that wish to override the output of Article::view should use a hook.
  58          * @todo MCR: Remove in 1.33
  59          * @deprecated since 1.32
  60          * @since 1.21
  61          */
  62         public $mContentObject;
  63
  64         /**
  65          * @var bool Is the target revision loaded? Set by fetchRevisionRecord().
  66          *
  67          * @deprecated since 1.32. Whether content has been loaded should not be relevant to
  68          * code outside this class.
  69          */
  70         public $mContentLoaded = false;
  71
  72         /**
  73          * @var int|null The oldid of the article that was requested to be shown,
  74          * 0 for the current revision.
  75          * @see $mRevIdFetched
  76          */
  77         public $mOldId;
  78
  79         /** @var Title|null Title from which we were redirected here, if any. */
  80         public $mRedirectedFrom = null;
  81
  82         /** @var string|bool URL to redirect to or false if none */
  83         public $mRedirectUrl = false;
  84
  85         /**
  86          * @var int Revision ID of revision that was loaded.
  87          * @see $mOldId
  88          * @deprecated since 1.32, use getRevIdFetched() instead.
  89          */
  90         public $mRevIdFetched = 0;
  91
  92         /**
  93          * @var Status|null represents the outcome of fetchRevisionRecord().
  94          * $fetchResult->value is the RevisionRecord object, if the operation was successful.
  95          *
  96          * The information in $fetchResult is duplicated by the following deprecated public fields:
  97          * $mRevIdFetched, $mContentLoaded. $mRevision (and $mContentObject) also typically duplicate
  98          * information of the loaded revision, but may be overwritten by extensions or due to errors.
  99          */
 100         private $fetchResult = null;
 101
 102         /**
 103          * @var Revision|null Revision to be shown. Initialized by getOldIDFromRequest()
 104          * or fetchContentObject(). Normally loaded from the database, but may be replaced
 105          * by an extension, or be a fake representing an error message or some such.
 106          * While the output of Article::view is typically based on this revision,
 107          * it may be overwritten by error messages or replaced by extensions.
 108          */
 109         public $mRevision = null;
 110
 111         /**
 112          * @var ParserOutput|null|false The ParserOutput generated for viewing the page,
 113          * initialized by view(). If no ParserOutput could be generated, this is set to false.
 114          * @deprecated since 1.32
 115          */
 116         public $mParserOutput = null;
 117
 118         /**
 119          * @var bool Whether render() was called. With the way subclasses work
 120          * here, there doesn't seem to be any other way to stop calling
 121          * OutputPage::enableSectionEditLinks() and still have it work as it did before.
 122          */
 123         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, 'parsemag' );
 299                 }
 300
 301                 return $content;
 302         }
 303
 304         /**
 305          * Returns ParserOutput to use when a page does not exist. In some cases, we still want to show
 306          * "virtual" content, e.g. in the MediaWiki namespace, or in the File namespace for non-local
 307          * files.
 308          *
 309          * @param ParserOptions $options
 310          *
 311          * @return ParserOutput
 312          */
 313         protected function getEmptyPageParserOutput( ParserOptions $options ) {
 314                 $content = $this->getSubstituteContent();
 315
 316                 return $content->getParserOutput( $this->getTitle(), 0, $options );
 317         }
 318
 319         /**
 320          * @see getOldIDFromRequest()
 321          * @see getRevIdFetched()
 322          *
 323          * @return int The oldid of the article that is was requested in the constructor or via the
 324          *         context's WebRequest.
 325          */
 326         public function getOldID() {
 327                 if ( is_null( $this->mOldId ) ) {
 328                         $this->mOldId = $this->getOldIDFromRequest();
 329                 }
 330
 331                 return $this->mOldId;
 332         }
 333
 334         /**
 335          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 336          *
 337          * @return int The old id for the request
 338          */
 339         public function getOldIDFromRequest() {
 340                 $this->mRedirectUrl = false;
 341
 342                 $request = $this->getContext()->getRequest();
 343                 $oldid = $request->getIntOrNull( 'oldid' );
 344
 345                 if ( $oldid === null ) {
 346                         return 0;
 347                 }
 348
 349                 if ( $oldid !== 0 ) {
 350                         # Load the given revision and check whether the page is another one.
 351                         # In that case, update this instance to reflect the change.
 352                         if ( $oldid === $this->mPage->getLatest() ) {
 353                                 $this->mRevision = $this->mPage->getRevision();
 354                         } else {
 355                                 $this->mRevision = Revision::newFromId( $oldid );
 356                                 if ( $this->mRevision !== null ) {
 357                                         // Revision title doesn't match the page title given?
 358                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 359                                                 $function = get_class( $this->mPage ) . '::newFromID';
 360                                                 $this->mPage = $function( $this->mRevision->getPage() );
 361                                         }
 362                                 }
 363                         }
 364                 }
 365
 366                 if ( $request->getVal( 'direction' ) == 'next' ) {
 367                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 368                         if ( $nextid ) {
 369                                 $oldid = $nextid;
 370                                 $this->mRevision = null;
 371                         } else {
 372                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 373                         }
 374                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 375                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 376                         if ( $previd ) {
 377                                 $oldid = $previd;
 378                                 $this->mRevision = null;
 379                         }
 380                 }
 381
 382                 $this->mRevIdFetched = $this->mRevision ? $this->mRevision->getId() : 0;
 383
 384                 return $oldid;
 385         }
 386
 387         /**
 388          * Get text content object
 389          * Does *NOT* follow redirects.
 390          * @todo When is this null?
 391          * @deprecated since 1.32, use fetchRevisionRecord() instead.
 392          *
 393          * @note Code that wants to retrieve page content from the database should
 394          * use WikiPage::getContent().
 395          *
 396          * @return Content|null|bool
 397          *
 398          * @since 1.21
 399          */
 400         protected function fetchContentObject() {
 401                 if ( !$this->mContentLoaded ) {
 402                         $this->fetchRevisionRecord();
 403                 }
 404
 405                 return $this->mContentObject;
 406         }
 407
 408         /**
 409          * Fetches the revision to work on.
 410          * The revision is typically loaded from the database, but may also be a fake representing
 411          * an error message or content supplied by an extension. Refer to $this->fetchResult for
 412          * the revision actually loaded from the database, and any errors encountered while doing
 413          * that.
 414          *
 415          * @return RevisionRecord|null
 416          */
 417         protected function fetchRevisionRecord() {
 418                 if ( $this->fetchResult ) {
 419                         return $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 420                 }
 421
 422                 $this->mContentLoaded = true;
 423                 $this->mContentObject = null;
 424
 425                 $oldid = $this->getOldID();
 426
 427                 // $this->mRevision might already be fetched by getOldIDFromRequest()
 428                 if ( !$this->mRevision ) {
 429                         if ( !$oldid ) {
 430                                 $this->mRevision = $this->mPage->getRevision();
 431
 432                                 if ( !$this->mRevision ) {
 433                                         wfDebug( __METHOD__ . " failed to find page data for title " .
 434                                                 $this->getTitle()->getPrefixedText() . "\n" );
 435
 436                                         // Just for sanity, output for this case is done by showMissingArticle().
 437                                         $this->fetchResult = Status::newFatal( 'noarticletext' );
 438                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 439                                         return null;
 440                                 }
 441                         } else {
 442                                 $this->mRevision = Revision::newFromId( $oldid );
 443
 444                                 if ( !$this->mRevision ) {
 445                                         wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid\n" );
 446
 447                                         $this->fetchResult = Status::newFatal( 'missing-revision', $oldid );
 448                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 449                                         return null;
 450                                 }
 451                         }
 452                 }
 453
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455                 $this->fetchResult = Status::newGood( $this->mRevision );
 456
 457                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $this->getContext()->getUser() ) ) {
 458                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 459                                 $this->mRevision->getId() . "\n" );
 460
 461                         // Just for sanity, output for this case is done by showDeletedRevisionHeader().
 462                         $this->fetchResult = Status::newFatal( 'rev-deleted-text-permission' );
 463                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 464                         return null;
 465                 }
 466
 467                 if ( Hooks::isRegistered( 'ArticleAfterFetchContentObject' ) ) {
 468                         $contentObject = $this->mRevision->getContent(
 469                                 Revision::FOR_THIS_USER,
 470                                 $this->getContext()->getUser()
 471                         );
 472
 473                         $hookContentObject = $contentObject;
 474
 475                                 // Avoid PHP 7.1 warning of passing $this by reference
 476                         $articlePage = $this;
 477
 478                         Hooks::run(
 479                                 'ArticleAfterFetchContentObject',
 480                                 [ &$articlePage, &$hookContentObject ],
 481                                 '1.32'
 482                         );
 483
 484                         if ( $hookContentObject !== $contentObject ) {
 485                                 // A hook handler is trying to override the content
 486                                 $this->applyContentOverride( $hookContentObject );
 487                         }
 488                 }
 489
 490                 // For B/C only
 491                 $this->mContentObject = $this->mRevision->getContent(
 492                         Revision::FOR_THIS_USER,
 493                         $this->getContext()->getUser()
 494                 );
 495
 496                 return $this->mRevision->getRevisionRecord();
 497         }
 498
 499         /**
 500          * Returns a Content object representing any error in $this->fetchContent, or null
 501          * if there is no such error.
 502          *
 503          * @return Content|null
 504          */
 505         private function makeFetchErrorContent() {
 506                 if ( !$this->fetchResult || $this->fetchResult->isOK() ) {
 507                         return null;
 508                 }
 509
 510                 return new MessageContent( $this->fetchResult->getMessage() );
 511         }
 512
 513         /**
 514          * Applies a content override by constructing a fake Revision object and assigning
 515          * it to mRevision. The fake revision will not have a user, timestamp or summary set.
 516          *
 517          * This mechanism exists mainly to accommodate extensions that use the
 518          * ArticleAfterFetchContentObject. Once that hook has been removed, there should no longer
 519          * be a need for a fake revision object. fetchRevisionRecord() presently also uses this mechanism
 520          * to report errors, but that could be changed to use $this->fetchResult instead.
 521          *
 522          * @param Content $override Content to be used instead of the actual page content,
 523          *        coming from an extension or representing an error message.
 524          */
 525         private function applyContentOverride( Content $override ) {
 526                 // Construct a fake revision
 527                 $rev = new MutableRevisionRecord( $this->getTitle() );
 528                 $rev->setContent( SlotRecord::MAIN, $override );
 529
 530                 $this->mRevision = new Revision( $rev );
 531
 532                 // For B/C only
 533                 $this->mContentObject = $override;
 534         }
 535
 536         /**
 537          * Returns true if the currently-referenced revision is the current edit
 538          * to this page (and it exists).
 539          * @return bool
 540          */
 541         public function isCurrent() {
 542                 # If no oldid, this is the current version.
 543                 if ( $this->getOldID() == 0 ) {
 544                         return true;
 545                 }
 546
 547                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 548         }
 549
 550         /**
 551          * Get the fetched Revision object depending on request parameters or null
 552          * on failure. The revision returned may be a fake representing an error message or
 553          * wrapping content supplied by an extension. Refer to $this->fetchResult for the
 554          * revision actually loaded from the database.
 555          *
 556          * @since 1.19
 557          * @return Revision|null
 558          */
 559         public function getRevisionFetched() {
 560                 $this->fetchRevisionRecord();
 561
 562                 if ( $this->fetchResult->isOK() ) {
 563                         return $this->mRevision;
 564                 }
 565         }
 566
 567         /**
 568          * Use this to fetch the rev ID used on page views
 569          *
 570          * Before fetchRevisionRecord was called, this returns the page's latest revision,
 571          * regardless of what getOldID() returns.
 572          *
 573          * @return int Revision ID of last article revision
 574          */
 575         public function getRevIdFetched() {
 576                 if ( $this->fetchResult && $this->fetchResult->isOK() ) {
 577                         return $this->fetchResult->value->getId();
 578                 } else {
 579                         return $this->mPage->getLatest();
 580                 }
 581         }
 582
 583         /**
 584          * This is the default action of the index.php entry point: just view the
 585          * page of the given title.
 586          */
 587         public function view() {
 588                 global $wgUseFileCache, $wgDebugToolbar;
 589
 590                 # Get variables from query string
 591                 # As side effect this will load the revision and update the title
 592                 # in a revision ID is passed in the request, so this should remain
 593                 # the first call of this method even if $oldid is used way below.
 594                 $oldid = $this->getOldID();
 595
 596                 $user = $this->getContext()->getUser();
 597                 # Another whitelist check in case getOldID() is altering the title
 598                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 599                 if ( count( $permErrors ) ) {
 600                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 601                         throw new PermissionsError( 'read', $permErrors );
 602                 }
 603
 604                 $outputPage = $this->getContext()->getOutput();
 605                 # getOldID() may as well want us to redirect somewhere else
 606                 if ( $this->mRedirectUrl ) {
 607                         $outputPage->redirect( $this->mRedirectUrl );
 608                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 609
 610                         return;
 611                 }
 612
 613                 # If we got diff in the query, we want to see a diff page instead of the article.
 614                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 615                         wfDebug( __METHOD__ . ": showing diff page\n" );
 616                         $this->showDiffPage();
 617
 618                         return;
 619                 }
 620
 621                 # Set page title (may be overridden by DISPLAYTITLE)
 622                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 623
 624                 $outputPage->setArticleFlag( true );
 625                 # Allow frames by default
 626                 $outputPage->allowClickjacking();
 627
 628                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 629
 630                 $parserOptions = $this->getParserOptions();
 631                 $poOptions = [];
 632                 # Render printable version, use printable version cache
 633                 if ( $outputPage->isPrintable() ) {
 634                         $parserOptions->setIsPrintable( true );
 635                         $poOptions['enableSectionEditLinks'] = false;
 636                 } elseif ( $this->viewIsRenderAction
 637                         || !$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                         // phpcs:ignore MediaWiki.Usage.NestedInlineTernary.UnparenthesizedTernary -- FIXME T203805
 824                         ? $outputDone // object fetched by hook
 825                         : ( $this->mParserOutput ?: null ); // ParserOutput or null, avoid false
 826
 827                 # Adjust title for main page & pages with displaytitle
 828                 if ( $pOutput ) {
 829                         $this->adjustDisplayTitle( $pOutput );
 830                 }
 831
 832                 # For the main page, overwrite the <title> element with the con-
 833                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 834                 # that's not empty).
 835                 # This message always exists because it is in the i18n files
 836                 if ( $this->getTitle()->isMainPage() ) {
 837                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 838                         if ( !$msg->isDisabled() ) {
 839                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 840                         }
 841                 }
 842
 843                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 844                 # This could use getTouched(), but that could be scary for major template edits.
 845                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 846
 847                 # Check for any __NOINDEX__ tags on the page using $pOutput
 848                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 849                 $outputPage->setIndexPolicy( $policy['index'] );
 850                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 851
 852                 $this->showViewFooter();
 853                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 854
 855                 # Load the postEdit module if the user just saved this revision
 856                 # See also EditPage::setPostEditCookie
 857                 $request = $this->getContext()->getRequest();
 858                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 859                 $postEdit = $request->getCookie( $cookieKey );
 860                 if ( $postEdit ) {
 861                         # Clear the cookie. This also prevents caching of the response.
 862                         $request->response()->clearCookie( $cookieKey );
 863                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 864                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 865                 }
 866         }
 867
 868         /**
 869          * @param RevisionRecord $revision
 870          * @return null|Title
 871          */
 872         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 873                 // TODO: find a *good* place for the code that determines the redirect target for
 874                 // a given revision!
 875                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 876                 $content = $revision->getContent( SlotRecord::MAIN );
 877                 return $content ? $content->getRedirectTarget() : null;
 878         }
 879
 880         /**
 881          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 882          * @param ParserOutput $pOutput
 883          */
 884         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 885                 $out = $this->getContext()->getOutput();
 886
 887                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 888                 $titleText = $pOutput->getTitleText();
 889                 if ( strval( $titleText ) !== '' ) {
 890                         $out->setPageTitle( $titleText );
 891                         $out->setDisplayTitle( $titleText );
 892                 }
 893         }
 894
 895         /**
 896          * Show a diff page according to current request variables. For use within
 897          * Article::view() only, other callers should use the DifferenceEngine class.
 898          */
 899         protected function showDiffPage() {
 900                 $request = $this->getContext()->getRequest();
 901                 $user = $this->getContext()->getUser();
 902                 $diff = $request->getVal( 'diff' );
 903                 $rcid = $request->getVal( 'rcid' );
 904                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 905                 $purge = $request->getVal( 'action' ) == 'purge';
 906                 $unhide = $request->getInt( 'unhide' ) == 1;
 907                 $oldid = $this->getOldID();
 908
 909                 $rev = $this->getRevisionFetched();
 910
 911                 if ( !$rev ) {
 912                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 913                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 914                                 ->params( $oldid )
 915                                 ->numParams( 1 )
 916                                 ->parseAsBlock();
 917                         $this->getContext()->getOutput()->addHTML( $msg );
 918                         return;
 919                 }
 920
 921                 $contentHandler = $rev->getContentHandler();
 922                 $de = $contentHandler->createDifferenceEngine(
 923                         $this->getContext(),
 924                         $oldid,
 925                         $diff,
 926                         $rcid,
 927                         $purge,
 928                         $unhide
 929                 );
 930
 931                 // DifferenceEngine directly fetched the revision:
 932                 $this->mRevIdFetched = $de->getNewid();
 933                 $de->showDiffPage( $diffOnly );
 934
 935                 // Run view updates for the newer revision being diffed (and shown
 936                 // below the diff if not $diffOnly).
 937                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 938                 // New can be false, convert it to 0 - this conveniently means the latest revision
 939                 $this->mPage->doViewUpdates( $user, (int)$new );
 940         }
 941
 942         /**
 943          * Get the robot policy to be used for the current view
 944          * @param string $action The action= GET parameter
 945          * @param ParserOutput|null $pOutput
 946          * @return array The policy that should be set
 947          * @todo actions other than 'view'
 948          */
 949         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 950                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 951
 952                 $ns = $this->getTitle()->getNamespace();
 953
 954                 # Don't index user and user talk pages for blocked users (T13443)
 955                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 956                         $specificTarget = null;
 957                         $vagueTarget = null;
 958                         $titleText = $this->getTitle()->getText();
 959                         if ( IP::isValid( $titleText ) ) {
 960                                 $vagueTarget = $titleText;
 961                         } else {
 962                                 $specificTarget = $titleText;
 963                         }
 964                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 965                                 return [
 966                                         'index' => 'noindex',
 967                                         'follow' => 'nofollow'
 968                                 ];
 969                         }
 970                 }
 971
 972                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 973                         # Non-articles (special pages etc), and old revisions
 974                         return [
 975                                 'index' => 'noindex',
 976                                 'follow' => 'nofollow'
 977                         ];
 978                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 979                         # Discourage indexing of printable versions, but encourage following
 980                         return [
 981                                 'index' => 'noindex',
 982                                 'follow' => 'follow'
 983                         ];
 984                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 985                         # For ?curid=x urls, disallow indexing
 986                         return [
 987                                 'index' => 'noindex',
 988                                 'follow' => 'follow'
 989                         ];
 990                 }
 991
 992                 # Otherwise, construct the policy based on the various config variables.
 993                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 994
 995                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 996                         # Honour customised robot policies for this namespace
 997                         $policy = array_merge(
 998                                 $policy,
 999                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1000                         );
1001                 }
1002                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1003                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1004                         # a final sanity check that we have really got the parser output.
1005                         $policy = array_merge(
1006                                 $policy,
1007                                 [ 'index' => $pOutput->getIndexPolicy() ]
1008                         );
1009                 }
1010
1011                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1012                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1013                         $policy = array_merge(
1014                                 $policy,
1015                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1016                         );
1017                 }
1018
1019                 return $policy;
1020         }
1021
1022         /**
1023          * Converts a String robot policy into an associative array, to allow
1024          * merging of several policies using array_merge().
1025          * @param array|string $policy Returns empty array on null/false/'', transparent
1026          *   to already-converted arrays, converts string.
1027          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1028          */
1029         public static function formatRobotPolicy( $policy ) {
1030                 if ( is_array( $policy ) ) {
1031                         return $policy;
1032                 } elseif ( !$policy ) {
1033                         return [];
1034                 }
1035
1036                 $policy = explode( ',', $policy );
1037                 $policy = array_map( 'trim', $policy );
1038
1039                 $arr = [];
1040                 foreach ( $policy as $var ) {
1041                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1042                                 $arr['index'] = $var;
1043                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1044                                 $arr['follow'] = $var;
1045                         }
1046                 }
1047
1048                 return $arr;
1049         }
1050
1051         /**
1052          * If this request is a redirect view, send "redirected from" subtitle to
1053          * the output. Returns true if the header was needed, false if this is not
1054          * a redirect view. Handles both local and remote redirects.
1055          *
1056          * @return bool
1057          */
1058         public function showRedirectedFromHeader() {
1059                 global $wgRedirectSources;
1060
1061                 $context = $this->getContext();
1062                 $outputPage = $context->getOutput();
1063                 $request = $context->getRequest();
1064                 $rdfrom = $request->getVal( 'rdfrom' );
1065
1066                 // Construct a URL for the current page view, but with the target title
1067                 $query = $request->getValues();
1068                 unset( $query['rdfrom'] );
1069                 unset( $query['title'] );
1070                 if ( $this->getTitle()->isRedirect() ) {
1071                         // Prevent double redirects
1072                         $query['redirect'] = 'no';
1073                 }
1074                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1075
1076                 if ( isset( $this->mRedirectedFrom ) ) {
1077                         // Avoid PHP 7.1 warning of passing $this by reference
1078                         $articlePage = $this;
1079
1080                         // This is an internally redirected page view.
1081                         // We'll need a backlink to the source page for navigation.
1082                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1083                                 $redir = Linker::linkKnown(
1084                                         $this->mRedirectedFrom,
1085                                         null,
1086                                         [],
1087                                         [ 'redirect' => 'no' ]
1088                                 );
1089
1090                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1091                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1092                                 . "</span>" );
1093
1094                                 // Add the script to update the displayed URL and
1095                                 // set the fragment if one was specified in the redirect
1096                                 $outputPage->addJsConfigVars( [
1097                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1098                                 ] );
1099                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1100
1101                                 // Add a <link rel="canonical"> tag
1102                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1103
1104                                 // Tell the output object that the user arrived at this article through a redirect
1105                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1106
1107                                 return true;
1108                         }
1109                 } elseif ( $rdfrom ) {
1110                         // This is an externally redirected view, from some other wiki.
1111                         // If it was reported from a trusted site, supply a backlink.
1112                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1113                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1114                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1115                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1116                                 . "</span>" );
1117
1118                                 // Add the script to update the displayed URL
1119                                 $outputPage->addJsConfigVars( [
1120                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1121                                 ] );
1122                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1123
1124                                 return true;
1125                         }
1126                 }
1127
1128                 return false;
1129         }
1130
1131         /**
1132          * Show a header specific to the namespace currently being viewed, like
1133          * [[MediaWiki:Talkpagetext]]. For Article::view().
1134          */
1135         public function showNamespaceHeader() {
1136                 if ( $this->getTitle()->isTalkPage() ) {
1137                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1138                                 $this->getContext()->getOutput()->wrapWikiMsg(
1139                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1140                                         [ 'talkpageheader' ]
1141                                 );
1142                         }
1143                 }
1144         }
1145
1146         /**
1147          * Show the footer section of an ordinary page view
1148          */
1149         public function showViewFooter() {
1150                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1151                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1152                         && IP::isValid( $this->getTitle()->getText() )
1153                 ) {
1154                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1155                 }
1156
1157                 // Show a footer allowing the user to patrol the shown revision or page if possible
1158                 $patrolFooterShown = $this->showPatrolFooter();
1159
1160                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1161         }
1162
1163         /**
1164          * If patrol is possible, output a patrol UI box. This is called from the
1165          * footer section of ordinary page views. If patrol is not possible or not
1166          * desired, does nothing.
1167          * Side effect: When the patrol link is build, this method will call
1168          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1169          *
1170          * @return bool
1171          */
1172         public function showPatrolFooter() {
1173                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1174
1175                 // Allow hooks to decide whether to not output this at all
1176                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1177                         return false;
1178                 }
1179
1180                 $outputPage = $this->getContext()->getOutput();
1181                 $user = $this->getContext()->getUser();
1182                 $title = $this->getTitle();
1183                 $rc = false;
1184
1185                 if ( !$title->quickUserCan( 'patrol', $user )
1186                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1187                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1188                 ) {
1189                         // Patrolling is disabled or the user isn't allowed to
1190                         return false;
1191                 }
1192
1193                 if ( $this->mRevision
1194                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1195                 ) {
1196                         // The current revision is already older than what could be in the RC table
1197                         // 6h tolerance because the RC might not be cleaned out regularly
1198                         return false;
1199                 }
1200
1201                 // Check for cached results
1202                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1203                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1204                 if ( $cache->get( $key ) ) {
1205                         return false;
1206                 }
1207
1208                 $dbr = wfGetDB( DB_REPLICA );
1209                 $oldestRevisionTimestamp = $dbr->selectField(
1210                         'revision',
1211                         'MIN( rev_timestamp )',
1212                         [ 'rev_page' => $title->getArticleID() ],
1213                         __METHOD__
1214                 );
1215
1216                 // New page patrol: Get the timestamp of the oldest revison which
1217                 // the revision table holds for the given page. Then we look
1218                 // whether it's within the RC lifespan and if it is, we try
1219                 // to get the recentchanges row belonging to that entry
1220                 // (with rc_new = 1).
1221                 $recentPageCreation = false;
1222                 if ( $oldestRevisionTimestamp
1223                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1224                 ) {
1225                         // 6h tolerance because the RC might not be cleaned out regularly
1226                         $recentPageCreation = true;
1227                         $rc = RecentChange::newFromConds(
1228                                 [
1229                                         'rc_new' => 1,
1230                                         'rc_timestamp' => $oldestRevisionTimestamp,
1231                                         'rc_namespace' => $title->getNamespace(),
1232                                         'rc_cur_id' => $title->getArticleID()
1233                                 ],
1234                                 __METHOD__
1235                         );
1236                         if ( $rc ) {
1237                                 // Use generic patrol message for new pages
1238                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1239                         }
1240                 }
1241
1242                 // File patrol: Get the timestamp of the latest upload for this page,
1243                 // check whether it is within the RC lifespan and if it is, we try
1244                 // to get the recentchanges row belonging to that entry
1245                 // (with rc_type = RC_LOG, rc_log_type = upload).
1246                 $recentFileUpload = false;
1247                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1248                         && $title->getNamespace() === NS_FILE ) {
1249                         // Retrieve timestamp of most recent upload
1250                         $newestUploadTimestamp = $dbr->selectField(
1251                                 'image',
1252                                 'MAX( img_timestamp )',
1253                                 [ 'img_name' => $title->getDBkey() ],
1254                                 __METHOD__
1255                         );
1256                         if ( $newestUploadTimestamp
1257                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1258                         ) {
1259                                 // 6h tolerance because the RC might not be cleaned out regularly
1260                                 $recentFileUpload = true;
1261                                 $rc = RecentChange::newFromConds(
1262                                         [
1263                                                 'rc_type' => RC_LOG,
1264                                                 'rc_log_type' => 'upload',
1265                                                 'rc_timestamp' => $newestUploadTimestamp,
1266                                                 'rc_namespace' => NS_FILE,
1267                                                 'rc_cur_id' => $title->getArticleID()
1268                                         ],
1269                                         __METHOD__
1270                                 );
1271                                 if ( $rc ) {
1272                                         // Use patrol message specific to files
1273                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1274                                 }
1275                         }
1276                 }
1277
1278                 if ( !$recentPageCreation && !$recentFileUpload ) {
1279                         // Page creation and latest upload (for files) is too old to be in RC
1280
1281                         // We definitely can't patrol so cache the information
1282                         // When a new file version is uploaded, the cache is cleared
1283                         $cache->set( $key, '1' );
1284
1285                         return false;
1286                 }
1287
1288                 if ( !$rc ) {
1289                         // Don't cache: This can be hit if the page gets accessed very fast after
1290                         // its creation / latest upload or in case we have high replica DB lag. In case
1291                         // the revision is too old, we will already return above.
1292                         return false;
1293                 }
1294
1295                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1296                         // Patrolled RC entry around
1297
1298                         // Cache the information we gathered above in case we can't patrol
1299                         // Don't cache in case we can patrol as this could change
1300                         $cache->set( $key, '1' );
1301
1302                         return false;
1303                 }
1304
1305                 if ( $rc->getPerformer()->equals( $user ) ) {
1306                         // Don't show a patrol link for own creations/uploads. If the user could
1307                         // patrol them, they already would be patrolled
1308                         return false;
1309                 }
1310
1311                 $outputPage->preventClickjacking();
1312                 if ( $user->isAllowed( 'writeapi' ) ) {
1313                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1314                 }
1315
1316                 $link = Linker::linkKnown(
1317                         $title,
1318                         $markPatrolledMsg->escaped(),
1319                         [],
1320                         [
1321                                 'action' => 'markpatrolled',
1322                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1323                         ]
1324                 );
1325
1326                 $outputPage->addHTML(
1327                         "<div class='patrollink' data-mw='interface'>" .
1328                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1329                         '</div>'
1330                 );
1331
1332                 return true;
1333         }
1334
1335         /**
1336          * Purge the cache used to check if it is worth showing the patrol footer
1337          * For example, it is done during re-uploads when file patrol is used.
1338          * @param int $articleID ID of the article to purge
1339          * @since 1.27
1340          */
1341         public static function purgePatrolFooterCache( $articleID ) {
1342                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1343                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1344         }
1345
1346         /**
1347          * Show the error text for a missing article. For articles in the MediaWiki
1348          * namespace, show the default message text. To be called from Article::view().
1349          */
1350         public function showMissingArticle() {
1351                 global $wgSend404Code;
1352
1353                 $outputPage = $this->getContext()->getOutput();
1354                 // Whether the page is a root user page of an existing user (but not a subpage)
1355                 $validUserPage = false;
1356
1357                 $title = $this->getTitle();
1358
1359                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1360                 if ( $title->getNamespace() == NS_USER
1361                         || $title->getNamespace() == NS_USER_TALK
1362                 ) {
1363                         $rootPart = explode( '/', $title->getText() )[0];
1364                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1365                         $ip = User::isIP( $rootPart );
1366                         $block = Block::newFromTarget( $user, $user );
1367
1368                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1369                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1370                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1371                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1372                                 # Show log extract if the user is currently blocked
1373                                 LogEventsList::showLogExtract(
1374                                         $outputPage,
1375                                         'block',
1376                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1377                                         '',
1378                                         [
1379                                                 'lim' => 1,
1380                                                 'showIfEmpty' => false,
1381                                                 'msgKey' => [
1382                                                         'blocked-notice-logextract',
1383                                                         $user->getName() # Support GENDER in notice
1384                                                 ]
1385                                         ]
1386                                 );
1387                                 $validUserPage = !$title->isSubpage();
1388                         } else {
1389                                 $validUserPage = !$title->isSubpage();
1390                         }
1391                 }
1392
1393                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1394
1395                 # Show delete and move logs if there were any such events.
1396                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1397                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1398                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
1399                 $key = $cache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1400                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1401                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1402                 if ( $loggedIn || $cache->get( $key ) || $sessionExists ) {
1403                         $logTypes = [ 'delete', 'move', 'protect' ];
1404
1405                         $dbr = wfGetDB( DB_REPLICA );
1406
1407                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1408                         // Give extensions a chance to hide their (unrelated) log entries
1409                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1410                         LogEventsList::showLogExtract(
1411                                 $outputPage,
1412                                 $logTypes,
1413                                 $title,
1414                                 '',
1415                                 [
1416                                         'lim' => 10,
1417                                         'conds' => $conds,
1418                                         'showIfEmpty' => false,
1419                                         'msgKey' => [ $loggedIn || $sessionExists
1420                                                 ? 'moveddeleted-notice'
1421                                                 : 'moveddeleted-notice-recent'
1422                                         ]
1423                                 ]
1424                         );
1425                 }
1426
1427                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1428                         // If there's no backing content, send a 404 Not Found
1429                         // for better machine handling of broken links.
1430                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1431                 }
1432
1433                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1434                 $policy = $this->getRobotPolicy( 'view' );
1435                 $outputPage->setIndexPolicy( $policy['index'] );
1436                 $outputPage->setFollowPolicy( $policy['follow'] );
1437
1438                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1439
1440                 if ( !$hookResult ) {
1441                         return;
1442                 }
1443
1444                 # Show error message
1445                 $oldid = $this->getOldID();
1446                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1447                         // use fake Content object for system message
1448                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1449                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1450                 } else {
1451                         if ( $oldid ) {
1452                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1453                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1454                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1455                         ) {
1456                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1457                                 $text = wfMessage( $message )->plain();
1458                         } else {
1459                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1460                         }
1461
1462                         $dir = $this->getContext()->getLanguage()->getDir();
1463                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1464                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1465                                 'class' => "noarticletext mw-content-$dir",
1466                                 'dir' => $dir,
1467                                 'lang' => $lang,
1468                         ] ) . "\n$text\n</div>" );
1469                 }
1470         }
1471
1472         /**
1473          * If the revision requested for view is deleted, check permissions.
1474          * Send either an error message or a warning header to the output.
1475          *
1476          * @return bool True if the view is allowed, false if not.
1477          */
1478         public function showDeletedRevisionHeader() {
1479                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1480                         // Not deleted
1481                         return true;
1482                 }
1483
1484                 $outputPage = $this->getContext()->getOutput();
1485                 $user = $this->getContext()->getUser();
1486                 // If the user is not allowed to see it...
1487                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1488                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1489                                 'rev-deleted-text-permission' );
1490
1491                         return false;
1492                 // If the user needs to confirm that they want to see it...
1493                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1494                         # Give explanation and add a link to view the revision...
1495                         $oldid = intval( $this->getOldID() );
1496                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1497                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1498                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1499                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1500                                 [ $msg, $link ] );
1501
1502                         return false;
1503                 // We are allowed to see...
1504                 } else {
1505                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1506                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1507                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1508
1509                         return true;
1510                 }
1511         }
1512
1513         /**
1514          * Generate the navigation links when browsing through an article revisions
1515          * It shows the information as:
1516          *   Revision as of \<date\>; view current revision
1517          *   \<- Previous version | Next Version -\>
1518          *
1519          * @param int $oldid Revision ID of this article revision
1520          */
1521         public function setOldSubtitle( $oldid = 0 ) {
1522                 // Avoid PHP 7.1 warning of passing $this by reference
1523                 $articlePage = $this;
1524
1525                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1526                         return;
1527                 }
1528
1529                 $context = $this->getContext();
1530                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1531
1532                 # Cascade unhide param in links for easy deletion browsing
1533                 $extraParams = [];
1534                 if ( $unhide ) {
1535                         $extraParams['unhide'] = 1;
1536                 }
1537
1538                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1539                         $revision = $this->mRevision;
1540                 } else {
1541                         $revision = Revision::newFromId( $oldid );
1542                 }
1543
1544                 $timestamp = $revision->getTimestamp();
1545
1546                 $current = ( $oldid == $this->mPage->getLatest() );
1547                 $language = $context->getLanguage();
1548                 $user = $context->getUser();
1549
1550                 $td = $language->userTimeAndDate( $timestamp, $user );
1551                 $tddate = $language->userDate( $timestamp, $user );
1552                 $tdtime = $language->userTime( $timestamp, $user );
1553
1554                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1555                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1556
1557                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1558                         ? 'revision-info-current'
1559                         : 'revision-info';
1560
1561                 $outputPage = $context->getOutput();
1562                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1563                         $context->msg( $infomsg, $td )
1564                                 ->rawParams( $userlinks )
1565                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1566                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1567                                 ->parse() .
1568                         "</div>";
1569
1570                 $lnk = $current
1571                         ? $context->msg( 'currentrevisionlink' )->escaped()
1572                         : Linker::linkKnown(
1573                                 $this->getTitle(),
1574                                 $context->msg( 'currentrevisionlink' )->escaped(),
1575                                 [],
1576                                 $extraParams
1577                         );
1578                 $curdiff = $current
1579                         ? $context->msg( 'diff' )->escaped()
1580                         : Linker::linkKnown(
1581                                 $this->getTitle(),
1582                                 $context->msg( 'diff' )->escaped(),
1583                                 [],
1584                                 [
1585                                         'diff' => 'cur',
1586                                         'oldid' => $oldid
1587                                 ] + $extraParams
1588                         );
1589                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1590                 $prevlink = $prev
1591                         ? Linker::linkKnown(
1592                                 $this->getTitle(),
1593                                 $context->msg( 'previousrevision' )->escaped(),
1594                                 [],
1595                                 [
1596                                         'direction' => 'prev',
1597                                         'oldid' => $oldid
1598                                 ] + $extraParams
1599                         )
1600                         : $context->msg( 'previousrevision' )->escaped();
1601                 $prevdiff = $prev
1602                         ? Linker::linkKnown(
1603                                 $this->getTitle(),
1604                                 $context->msg( 'diff' )->escaped(),
1605                                 [],
1606                                 [
1607                                         'diff' => 'prev',
1608                                         'oldid' => $oldid
1609                                 ] + $extraParams
1610                         )
1611                         : $context->msg( 'diff' )->escaped();
1612                 $nextlink = $current
1613                         ? $context->msg( 'nextrevision' )->escaped()
1614                         : Linker::linkKnown(
1615                                 $this->getTitle(),
1616                                 $context->msg( 'nextrevision' )->escaped(),
1617                                 [],
1618                                 [
1619                                         'direction' => 'next',
1620                                         'oldid' => $oldid
1621                                 ] + $extraParams
1622                         );
1623                 $nextdiff = $current
1624                         ? $context->msg( 'diff' )->escaped()
1625                         : Linker::linkKnown(
1626                                 $this->getTitle(),
1627                                 $context->msg( 'diff' )->escaped(),
1628                                 [],
1629                                 [
1630                                         'diff' => 'next',
1631                                         'oldid' => $oldid
1632                                 ] + $extraParams
1633                         );
1634
1635                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1636                 if ( $cdel !== '' ) {
1637                         $cdel .= ' ';
1638                 }
1639
1640                 // the outer div is need for styling the revision info and nav in MobileFrontend
1641                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1642                         "<div id=\"mw-revision-nav\">" . $cdel .
1643                         $context->msg( 'revision-nav' )->rawParams(
1644                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1645                         )->escaped() . "</div></div>" );
1646         }
1647
1648         /**
1649          * Return the HTML for the top of a redirect page
1650          *
1651          * Chances are you should just be using the ParserOutput from
1652          * WikitextContent::getParserOutput instead of calling this for redirects.
1653          *
1654          * @param Title|array $target Destination(s) to redirect
1655          * @param bool $appendSubtitle [optional]
1656          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1657          * @return string Containing HTML with redirect link
1658          *
1659          * @deprecated since 1.30
1660          */
1661         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1662                 $lang = $this->getTitle()->getPageLanguage();
1663                 $out = $this->getContext()->getOutput();
1664                 if ( $appendSubtitle ) {
1665                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1666                 }
1667                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1668                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1669         }
1670
1671         /**
1672          * Return the HTML for the top of a redirect page
1673          *
1674          * Chances are you should just be using the ParserOutput from
1675          * WikitextContent::getParserOutput instead of calling this for redirects.
1676          *
1677          * @since 1.23
1678          * @param Language $lang
1679          * @param Title|array $target Destination(s) to redirect
1680          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1681          * @return string Containing HTML with redirect link
1682          */
1683         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1684                 if ( !is_array( $target ) ) {
1685                         $target = [ $target ];
1686                 }
1687
1688                 $html = '<ul class="redirectText">';
1689                 /** @var Title $title */
1690                 foreach ( $target as $title ) {
1691                         $html .= '<li>' . Linker::link(
1692                                 $title,
1693                                 htmlspecialchars( $title->getFullText() ),
1694                                 [],
1695                                 // Make sure wiki page redirects are not followed
1696                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1697                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1698                         ) . '</li>';
1699                 }
1700                 $html .= '</ul>';
1701
1702                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1703
1704                 return '<div class="redirectMsg">' .
1705                         '<p>' . $redirectToText . '</p>' .
1706                         $html .
1707                         '</div>';
1708         }
1709
1710         /**
1711          * Adds help link with an icon via page indicators.
1712          * Link target can be overridden by a local message containing a wikilink:
1713          * the message key is: 'namespace-' + namespace number + '-helppage'.
1714          * @param string $to Target MediaWiki.org page title or encoded URL.
1715          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1716          * @since 1.25
1717          */
1718         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1719                 $msg = wfMessage(
1720                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1721                 );
1722
1723                 $out = $this->getContext()->getOutput();
1724                 if ( !$msg->isDisabled() ) {
1725                         $helpUrl = Skin::makeUrl( $msg->plain() );
1726                         $out->addHelpLink( $helpUrl, true );
1727                 } else {
1728                         $out->addHelpLink( $to, $overrideBaseUrl );
1729                 }
1730         }
1731
1732         /**
1733          * Handle action=render
1734          */
1735         public function render() {
1736                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1737                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1738                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1739                 $this->viewIsRenderAction = true;
1740                 $this->view();
1741         }
1742
1743         /**
1744          * action=protect handler
1745          */
1746         public function protect() {
1747                 $form = new ProtectionForm( $this );
1748                 $form->execute();
1749         }
1750
1751         /**
1752          * action=unprotect handler (alias)
1753          */
1754         public function unprotect() {
1755                 $this->protect();
1756         }
1757
1758         /**
1759          * UI entry point for page deletion
1760          */
1761         public function delete() {
1762                 # This code desperately needs to be totally rewritten
1763
1764                 $title = $this->getTitle();
1765                 $context = $this->getContext();
1766                 $user = $context->getUser();
1767                 $request = $context->getRequest();
1768
1769                 # Check permissions
1770                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1771                 if ( count( $permissionErrors ) ) {
1772                         throw new PermissionsError( 'delete', $permissionErrors );
1773                 }
1774
1775                 # Read-only check...
1776                 if ( wfReadOnly() ) {
1777                         throw new ReadOnlyError;
1778                 }
1779
1780                 # Better double-check that it hasn't been deleted yet!
1781                 $this->mPage->loadPageData(
1782                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1783                 );
1784                 if ( !$this->mPage->exists() ) {
1785                         $deleteLogPage = new LogPage( 'delete' );
1786                         $outputPage = $context->getOutput();
1787                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1788                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1789                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1790                                 );
1791                         $outputPage->addHTML(
1792                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1793                         );
1794                         LogEventsList::showLogExtract(
1795                                 $outputPage,
1796                                 'delete',
1797                                 $title
1798                         );
1799
1800                         return;
1801                 }
1802
1803                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1804                 $deleteReason = $request->getText( 'wpReason' );
1805
1806                 if ( $deleteReasonList == 'other' ) {
1807                         $reason = $deleteReason;
1808                 } elseif ( $deleteReason != '' ) {
1809                         // Entry from drop down menu + additional comment
1810                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1811                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1812                 } else {
1813                         $reason = $deleteReasonList;
1814                 }
1815
1816                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1817                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1818                 ) {
1819                         # Flag to hide all contents of the archived revisions
1820                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1821
1822                         $this->doDelete( $reason, $suppress );
1823
1824                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1825
1826                         return;
1827                 }
1828
1829                 // Generate deletion reason
1830                 $hasHistory = false;
1831                 if ( !$reason ) {
1832                         try {
1833                                 $reason = $this->generateReason( $hasHistory );
1834                         } catch ( Exception $e ) {
1835                                 # if a page is horribly broken, we still want to be able to
1836                                 # delete it. So be lenient about errors here.
1837                                 wfDebug( "Error while building auto delete summary: $e" );
1838                                 $reason = '';
1839                         }
1840                 }
1841
1842                 // If the page has a history, insert a warning
1843                 if ( $hasHistory ) {
1844                         $title = $this->getTitle();
1845
1846                         // The following can use the real revision count as this is only being shown for users
1847                         // that can delete this page.
1848                         // This, as a side-effect, also makes sure that the following query isn't being run for
1849                         // pages with a larger history, unless the user has the 'bigdelete' right
1850                         // (and is about to delete this page).
1851                         $dbr = wfGetDB( DB_REPLICA );
1852                         $revisions = $edits = (int)$dbr->selectField(
1853                                 'revision',
1854                                 'COUNT(rev_page)',
1855                                 [ 'rev_page' => $title->getArticleID() ],
1856                                 __METHOD__
1857                         );
1858
1859                         // @todo i18n issue/patchwork message
1860                         $context->getOutput()->addHTML(
1861                                 '<strong class="mw-delete-warning-revisions">' .
1862                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1863                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1864                                         $context->msg( 'history' )->escaped(),
1865                                         [],
1866                                         [ 'action' => 'history' ] ) .
1867                                 '</strong>'
1868                         );
1869
1870                         if ( $title->isBigDeletion() ) {
1871                                 global $wgDeleteRevisionsLimit;
1872                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1873                                         [
1874                                                 'delete-warning-toobig',
1875                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1876                                         ]
1877                                 );
1878                         }
1879                 }
1880
1881                 $this->confirmDelete( $reason );
1882         }
1883
1884         /**
1885          * Output deletion confirmation dialog
1886          * @todo Move to another file?
1887          * @param string $reason Prefilled reason
1888          */
1889         public function confirmDelete( $reason ) {
1890                 wfDebug( "Article::confirmDelete\n" );
1891
1892                 $title = $this->getTitle();
1893                 $ctx = $this->getContext();
1894                 $outputPage = $ctx->getOutput();
1895                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1896                 $outputPage->addBacklinkSubtitle( $title );
1897                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1898                 $outputPage->addModules( 'mediawiki.action.delete' );
1899
1900                 $backlinkCache = $title->getBacklinkCache();
1901                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1902                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1903                                 'deleting-backlinks-warning' );
1904                 }
1905
1906                 $subpageQueryLimit = 51;
1907                 $subpages = $title->getSubpages( $subpageQueryLimit );
1908                 $subpageCount = count( $subpages );
1909                 if ( $subpageCount > 0 ) {
1910                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1911                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1912                 }
1913                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1914
1915                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1916
1917                 $user = $this->getContext()->getUser();
1918                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1919
1920                 $outputPage->enableOOUI();
1921
1922                 $options = Xml::listDropDownOptions(
1923                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1924                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1925                 );
1926                 $options = Xml::listDropDownOptionsOoui( $options );
1927
1928                 $fields[] = new OOUI\FieldLayout(
1929                         new OOUI\DropdownInputWidget( [
1930                                 'name' => 'wpDeleteReasonList',
1931                                 'inputId' => 'wpDeleteReasonList',
1932                                 'tabIndex' => 1,
1933                                 'infusable' => true,
1934                                 'value' => '',
1935                                 'options' => $options
1936                         ] ),
1937                         [
1938                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1939                                 'align' => 'top',
1940                         ]
1941                 );
1942
1943                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1944                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1945                 // Unicode codepoints (or 255 UTF-8 bytes for old schema).
1946                 $conf = $this->getContext()->getConfig();
1947                 $oldCommentSchema = $conf->get( 'CommentTableSchemaMigrationStage' ) === MIGRATION_OLD;
1948                 $fields[] = new OOUI\FieldLayout(
1949                         new OOUI\TextInputWidget( [
1950                                 'name' => 'wpReason',
1951                                 'inputId' => 'wpReason',
1952                                 'tabIndex' => 2,
1953                                 'maxLength' => $oldCommentSchema ? 255 : CommentStore::COMMENT_CHARACTER_LIMIT,
1954                                 'infusable' => true,
1955                                 'value' => $reason,
1956                                 'autofocus' => true,
1957                         ] ),
1958                         [
1959                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1960                                 'align' => 'top',
1961                         ]
1962                 );
1963
1964                 if ( $user->isLoggedIn() ) {
1965                         $fields[] = new OOUI\FieldLayout(
1966                                 new OOUI\CheckboxInputWidget( [
1967                                         'name' => 'wpWatch',
1968                                         'inputId' => 'wpWatch',
1969                                         'tabIndex' => 3,
1970                                         'selected' => $checkWatch,
1971                                 ] ),
1972                                 [
1973                                         'label' => $ctx->msg( 'watchthis' )->text(),
1974                                         'align' => 'inline',
1975                                         'infusable' => true,
1976                                 ]
1977                         );
1978                 }
1979
1980                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1981                         $fields[] = new OOUI\FieldLayout(
1982                                 new OOUI\CheckboxInputWidget( [
1983                                         'name' => 'wpSuppress',
1984                                         'inputId' => 'wpSuppress',
1985                                         'tabIndex' => 4,
1986                                 ] ),
1987                                 [
1988                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1989                                         'align' => 'inline',
1990                                         'infusable' => true,
1991                                 ]
1992                         );
1993                 }
1994
1995                 $fields[] = new OOUI\FieldLayout(
1996                         new OOUI\ButtonInputWidget( [
1997                                 'name' => 'wpConfirmB',
1998                                 'inputId' => 'wpConfirmB',
1999                                 'tabIndex' => 5,
2000                                 'value' => $ctx->msg( 'deletepage' )->text(),
2001                                 'label' => $ctx->msg( 'deletepage' )->text(),
2002                                 'flags' => [ 'primary', 'destructive' ],
2003                                 'type' => 'submit',
2004                         ] ),
2005                         [
2006                                 'align' => 'top',
2007                         ]
2008                 );
2009
2010                 $fieldset = new OOUI\FieldsetLayout( [
2011                         'label' => $ctx->msg( 'delete-legend' )->text(),
2012                         'id' => 'mw-delete-table',
2013                         'items' => $fields,
2014                 ] );
2015
2016                 $form = new OOUI\FormLayout( [
2017                         'method' => 'post',
2018                         'action' => $title->getLocalURL( 'action=delete' ),
2019                         'id' => 'deleteconfirm',
2020                 ] );
2021                 $form->appendContent(
2022                         $fieldset,
2023                         new OOUI\HtmlSnippet(
2024                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2025                         )
2026                 );
2027
2028                 $outputPage->addHTML(
2029                         new OOUI\PanelLayout( [
2030                                 'classes' => [ 'deletepage-wrapper' ],
2031                                 'expanded' => false,
2032                                 'padded' => true,
2033                                 'framed' => true,
2034                                 'content' => $form,
2035                         ] )
2036                 );
2037
2038                 if ( $user->isAllowed( 'editinterface' ) ) {
2039                         $link = Linker::linkKnown(
2040                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2041                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2042                                 [],
2043                                 [ 'action' => 'edit' ]
2044                         );
2045                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2046                 }
2047
2048                 $deleteLogPage = new LogPage( 'delete' );
2049                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2050                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2051         }
2052
2053         /**
2054          * Perform a deletion and output success or failure messages
2055          * @param string $reason
2056          * @param bool $suppress
2057          * @param bool $immediate false allows deleting over time via the job queue
2058          * @throws FatalError
2059          * @throws MWException
2060          */
2061         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2062                 $error = '';
2063                 $context = $this->getContext();
2064                 $outputPage = $context->getOutput();
2065                 $user = $context->getUser();
2066                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2067                         [], 'delete', $immediate );
2068
2069                 if ( $status->isOK() ) {
2070                         $deleted = $this->getTitle()->getPrefixedText();
2071
2072                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2073                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2074
2075                         if ( $status->isGood() ) {
2076                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2077                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2078                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2079                         } else {
2080                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2081                         }
2082
2083                         $outputPage->returnToMain( false );
2084                 } else {
2085                         $outputPage->setPageTitle(
2086                                 wfMessage( 'cannotdelete-title',
2087                                         $this->getTitle()->getPrefixedText() )
2088                         );
2089
2090                         if ( $error == '' ) {
2091                                 $outputPage->wrapWikiTextAsInterface(
2092                                         'error mw-error-cannotdelete',
2093                                         $status->getWikiText()
2094                                 );
2095                                 $deleteLogPage = new LogPage( 'delete' );
2096                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2097
2098                                 LogEventsList::showLogExtract(
2099                                         $outputPage,
2100                                         'delete',
2101                                         $this->getTitle()
2102                                 );
2103                         } else {
2104                                 $outputPage->addHTML( $error );
2105                         }
2106                 }
2107         }
2108
2109         /* Caching functions */
2110
2111         /**
2112          * checkLastModified returns true if it has taken care of all
2113          * output to the client that is necessary for this request.
2114          * (that is, it has sent a cached version of the page)
2115          *
2116          * @return bool True if cached version send, false otherwise
2117          */
2118         protected function tryFileCache() {
2119                 static $called = false;
2120
2121                 if ( $called ) {
2122                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2123                         return false;
2124                 }
2125
2126                 $called = true;
2127                 if ( $this->isFileCacheable() ) {
2128                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2129                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2130                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2131                                 $cache->loadFromFileCache( $this->getContext() );
2132                                 return true;
2133                         } else {
2134                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2135                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2136                         }
2137                 } else {
2138                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2139                 }
2140
2141                 return false;
2142         }
2143
2144         /**
2145          * Check if the page can be cached
2146          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2147          * @return bool
2148          */
2149         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2150                 $cacheable = false;
2151
2152                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2153                         $cacheable = $this->mPage->getId()
2154                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2155                         // Extension may have reason to disable file caching on some pages.
2156                         if ( $cacheable ) {
2157                                 // Avoid PHP 7.1 warning of passing $this by reference
2158                                 $articlePage = $this;
2159                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2160                         }
2161                 }
2162
2163                 return $cacheable;
2164         }
2165
2166         /**#@-*/
2167
2168         /**
2169          * Lightweight method to get the parser output for a page, checking the parser cache
2170          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2171          * consider, so it's not appropriate to use there.
2172          *
2173          * @since 1.16 (r52326) for LiquidThreads
2174          *
2175          * @param int|null $oldid Revision ID or null
2176          * @param User|null $user The relevant user
2177          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2178          */
2179         public function getParserOutput( $oldid = null, User $user = null ) {
2180                 // XXX: bypasses mParserOptions and thus setParserOptions()
2181
2182                 if ( $user === null ) {
2183                         $parserOptions = $this->getParserOptions();
2184                 } else {
2185                         $parserOptions = $this->mPage->makeParserOptions( $user );
2186                 }
2187
2188                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2189         }
2190
2191         /**
2192          * Override the ParserOptions used to render the primary article wikitext.
2193          *
2194          * @param ParserOptions $options
2195          * @throws MWException If the parser options where already initialized.
2196          */
2197         public function setParserOptions( ParserOptions $options ) {
2198                 if ( $this->mParserOptions ) {
2199                         throw new MWException( "can't change parser options after they have already been set" );
2200                 }
2201
2202                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2203                 $this->mParserOptions = clone $options;
2204         }
2205
2206         /**
2207          * Get parser options suitable for rendering the primary article wikitext
2208          * @return ParserOptions
2209          */
2210         public function getParserOptions() {
2211                 if ( !$this->mParserOptions ) {
2212                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2213                 }
2214                 // Clone to allow modifications of the return value without affecting cache
2215                 return clone $this->mParserOptions;
2216         }
2217
2218         /**
2219          * Sets the context this Article is executed in
2220          *
2221          * @param IContextSource $context
2222          * @since 1.18
2223          */
2224         public function setContext( $context ) {
2225                 $this->mContext = $context;
2226         }
2227
2228         /**
2229          * Gets the context this Article is executed in
2230          *
2231          * @return IContextSource
2232          * @since 1.18
2233          */
2234         public function getContext() {
2235                 if ( $this->mContext instanceof IContextSource ) {
2236                         return $this->mContext;
2237                 } else {
2238                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2239                                 "Return RequestContext::getMain(); for sanity\n" );
2240                         return RequestContext::getMain();
2241                 }
2242         }
2243
2244         /**
2245          * Use PHP's magic __get handler to handle accessing of
2246          * raw WikiPage fields for backwards compatibility.
2247          *
2248          * @param string $fname Field name
2249          * @return mixed
2250          */
2251         public function __get( $fname ) {
2252                 if ( property_exists( $this->mPage, $fname ) ) {
2253                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2254                         return $this->mPage->$fname;
2255                 }
2256                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2257         }
2258
2259         /**
2260          * Use PHP's magic __set handler to handle setting of
2261          * raw WikiPage fields for backwards compatibility.
2262          *
2263          * @param string $fname Field name
2264          * @param mixed $fvalue New value
2265          */
2266         public function __set( $fname, $fvalue ) {
2267                 if ( property_exists( $this->mPage, $fname ) ) {
2268                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2269                         $this->mPage->$fname = $fvalue;
2270                 // Note: extensions may want to toss on new fields
2271                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2272                         $this->mPage->$fname = $fvalue;
2273                 } else {
2274                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2275                 }
2276         }
2277
2278         /**
2279          * Call to WikiPage function for backwards compatibility.
2280          * @see WikiPage::checkFlags
2281          */
2282         public function checkFlags( $flags ) {
2283                 return $this->mPage->checkFlags( $flags );
2284         }
2285
2286         /**
2287          * Call to WikiPage function for backwards compatibility.
2288          * @see WikiPage::checkTouched
2289          */
2290         public function checkTouched() {
2291                 return $this->mPage->checkTouched();
2292         }
2293
2294         /**
2295          * Call to WikiPage function for backwards compatibility.
2296          * @see WikiPage::clearPreparedEdit
2297          */
2298         public function clearPreparedEdit() {
2299                 $this->mPage->clearPreparedEdit();
2300         }
2301
2302         /**
2303          * Call to WikiPage function for backwards compatibility.
2304          * @see WikiPage::doDeleteArticleReal
2305          */
2306         public function doDeleteArticleReal(
2307                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2308                 $tags = [], $immediate = false
2309         ) {
2310                 return $this->mPage->doDeleteArticleReal(
2311                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2312                 );
2313         }
2314
2315         /**
2316          * Call to WikiPage function for backwards compatibility.
2317          * @see WikiPage::doDeleteUpdates
2318          */
2319         public function doDeleteUpdates(
2320                 $id,
2321                 Content $content = null,
2322                 $revision = null,
2323                 User $user = null
2324         ) {
2325                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2326         }
2327
2328         /**
2329          * Call to WikiPage function for backwards compatibility.
2330          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2331          * @see WikiPage::doEditContent
2332          */
2333         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2334                 User $user = null, $serialFormat = null
2335         ) {
2336                 wfDeprecated( __METHOD__, '1.29' );
2337                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2338                         $user, $serialFormat
2339                 );
2340         }
2341
2342         /**
2343          * Call to WikiPage function for backwards compatibility.
2344          * @see WikiPage::doEditUpdates
2345          */
2346         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2347                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2348         }
2349
2350         /**
2351          * Call to WikiPage function for backwards compatibility.
2352          * @see WikiPage::doPurge
2353          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2354          *  controlled how much purging was done.
2355          */
2356         public function doPurge() {
2357                 return $this->mPage->doPurge();
2358         }
2359
2360         /**
2361          * Call to WikiPage function for backwards compatibility.
2362          * @see WikiPage::doViewUpdates
2363          */
2364         public function doViewUpdates( User $user, $oldid = 0 ) {
2365                 $this->mPage->doViewUpdates( $user, $oldid );
2366         }
2367
2368         /**
2369          * Call to WikiPage function for backwards compatibility.
2370          * @see WikiPage::exists
2371          */
2372         public function exists() {
2373                 return $this->mPage->exists();
2374         }
2375
2376         /**
2377          * Call to WikiPage function for backwards compatibility.
2378          * @see WikiPage::followRedirect
2379          */
2380         public function followRedirect() {
2381                 return $this->mPage->followRedirect();
2382         }
2383
2384         /**
2385          * Call to WikiPage function for backwards compatibility.
2386          * @see ContentHandler::getActionOverrides
2387          */
2388         public function getActionOverrides() {
2389                 return $this->mPage->getActionOverrides();
2390         }
2391
2392         /**
2393          * Call to WikiPage function for backwards compatibility.
2394          * @see WikiPage::getAutoDeleteReason
2395          */
2396         public function getAutoDeleteReason( &$hasHistory ) {
2397                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2398         }
2399
2400         /**
2401          * Call to WikiPage function for backwards compatibility.
2402          * @see WikiPage::getCategories
2403          */
2404         public function getCategories() {
2405                 return $this->mPage->getCategories();
2406         }
2407
2408         /**
2409          * Call to WikiPage function for backwards compatibility.
2410          * @see WikiPage::getComment
2411          */
2412         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2413                 return $this->mPage->getComment( $audience, $user );
2414         }
2415
2416         /**
2417          * Call to WikiPage function for backwards compatibility.
2418          * @see WikiPage::getContentHandler
2419          */
2420         public function getContentHandler() {
2421                 return $this->mPage->getContentHandler();
2422         }
2423
2424         /**
2425          * Call to WikiPage function for backwards compatibility.
2426          * @see WikiPage::getContentModel
2427          */
2428         public function getContentModel() {
2429                 return $this->mPage->getContentModel();
2430         }
2431
2432         /**
2433          * Call to WikiPage function for backwards compatibility.
2434          * @see WikiPage::getContributors
2435          */
2436         public function getContributors() {
2437                 return $this->mPage->getContributors();
2438         }
2439
2440         /**
2441          * Call to WikiPage function for backwards compatibility.
2442          * @see WikiPage::getCreator
2443          */
2444         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2445                 return $this->mPage->getCreator( $audience, $user );
2446         }
2447
2448         /**
2449          * Call to WikiPage function for backwards compatibility.
2450          * @see WikiPage::getDeletionUpdates
2451          */
2452         public function getDeletionUpdates( Content $content = null ) {
2453                 return $this->mPage->getDeletionUpdates( $content );
2454         }
2455
2456         /**
2457          * Call to WikiPage function for backwards compatibility.
2458          * @see WikiPage::getHiddenCategories
2459          */
2460         public function getHiddenCategories() {
2461                 return $this->mPage->getHiddenCategories();
2462         }
2463
2464         /**
2465          * Call to WikiPage function for backwards compatibility.
2466          * @see WikiPage::getId
2467          */
2468         public function getId() {
2469                 return $this->mPage->getId();
2470         }
2471
2472         /**
2473          * Call to WikiPage function for backwards compatibility.
2474          * @see WikiPage::getLatest
2475          */
2476         public function getLatest() {
2477                 return $this->mPage->getLatest();
2478         }
2479
2480         /**
2481          * Call to WikiPage function for backwards compatibility.
2482          * @see WikiPage::getLinksTimestamp
2483          */
2484         public function getLinksTimestamp() {
2485                 return $this->mPage->getLinksTimestamp();
2486         }
2487
2488         /**
2489          * Call to WikiPage function for backwards compatibility.
2490          * @see WikiPage::getMinorEdit
2491          */
2492         public function getMinorEdit() {
2493                 return $this->mPage->getMinorEdit();
2494         }
2495
2496         /**
2497          * Call to WikiPage function for backwards compatibility.
2498          * @see WikiPage::getOldestRevision
2499          */
2500         public function getOldestRevision() {
2501                 return $this->mPage->getOldestRevision();
2502         }
2503
2504         /**
2505          * Call to WikiPage function for backwards compatibility.
2506          * @see WikiPage::getRedirectTarget
2507          */
2508         public function getRedirectTarget() {
2509                 return $this->mPage->getRedirectTarget();
2510         }
2511
2512         /**
2513          * Call to WikiPage function for backwards compatibility.
2514          * @see WikiPage::getRedirectURL
2515          */
2516         public function getRedirectURL( $rt ) {
2517                 return $this->mPage->getRedirectURL( $rt );
2518         }
2519
2520         /**
2521          * Call to WikiPage function for backwards compatibility.
2522          * @see WikiPage::getRevision
2523          */
2524         public function getRevision() {
2525                 return $this->mPage->getRevision();
2526         }
2527
2528         /**
2529          * Call to WikiPage function for backwards compatibility.
2530          * @see WikiPage::getTimestamp
2531          */
2532         public function getTimestamp() {
2533                 return $this->mPage->getTimestamp();
2534         }
2535
2536         /**
2537          * Call to WikiPage function for backwards compatibility.
2538          * @see WikiPage::getTouched
2539          */
2540         public function getTouched() {
2541                 return $this->mPage->getTouched();
2542         }
2543
2544         /**
2545          * Call to WikiPage function for backwards compatibility.
2546          * @see WikiPage::getUndoContent
2547          */
2548         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2549                 return $this->mPage->getUndoContent( $undo, $undoafter );
2550         }
2551
2552         /**
2553          * Call to WikiPage function for backwards compatibility.
2554          * @see WikiPage::getUser
2555          */
2556         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2557                 return $this->mPage->getUser( $audience, $user );
2558         }
2559
2560         /**
2561          * Call to WikiPage function for backwards compatibility.
2562          * @see WikiPage::getUserText
2563          */
2564         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2565                 return $this->mPage->getUserText( $audience, $user );
2566         }
2567
2568         /**
2569          * Call to WikiPage function for backwards compatibility.
2570          * @see WikiPage::hasViewableContent
2571          */
2572         public function hasViewableContent() {
2573                 return $this->mPage->hasViewableContent();
2574         }
2575
2576         /**
2577          * Call to WikiPage function for backwards compatibility.
2578          * @see WikiPage::insertOn
2579          */
2580         public function insertOn( $dbw, $pageId = null ) {
2581                 return $this->mPage->insertOn( $dbw, $pageId );
2582         }
2583
2584         /**
2585          * Call to WikiPage function for backwards compatibility.
2586          * @see WikiPage::insertProtectNullRevision
2587          */
2588         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2589                 array $expiry, $cascade, $reason, $user = null
2590         ) {
2591                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2592                         $expiry, $cascade, $reason, $user
2593                 );
2594         }
2595
2596         /**
2597          * Call to WikiPage function for backwards compatibility.
2598          * @see WikiPage::insertRedirect
2599          */
2600         public function insertRedirect() {
2601                 return $this->mPage->insertRedirect();
2602         }
2603
2604         /**
2605          * Call to WikiPage function for backwards compatibility.
2606          * @see WikiPage::insertRedirectEntry
2607          */
2608         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2609                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2610         }
2611
2612         /**
2613          * Call to WikiPage function for backwards compatibility.
2614          * @see WikiPage::isCountable
2615          */
2616         public function isCountable( $editInfo = false ) {
2617                 return $this->mPage->isCountable( $editInfo );
2618         }
2619
2620         /**
2621          * Call to WikiPage function for backwards compatibility.
2622          * @see WikiPage::isRedirect
2623          */
2624         public function isRedirect() {
2625                 return $this->mPage->isRedirect();
2626         }
2627
2628         /**
2629          * Call to WikiPage function for backwards compatibility.
2630          * @see WikiPage::loadFromRow
2631          */
2632         public function loadFromRow( $data, $from ) {
2633                 return $this->mPage->loadFromRow( $data, $from );
2634         }
2635
2636         /**
2637          * Call to WikiPage function for backwards compatibility.
2638          * @see WikiPage::loadPageData
2639          */
2640         public function loadPageData( $from = 'fromdb' ) {
2641                 $this->mPage->loadPageData( $from );
2642         }
2643
2644         /**
2645          * Call to WikiPage function for backwards compatibility.
2646          * @see WikiPage::lockAndGetLatest
2647          */
2648         public function lockAndGetLatest() {
2649                 return $this->mPage->lockAndGetLatest();
2650         }
2651
2652         /**
2653          * Call to WikiPage function for backwards compatibility.
2654          * @see WikiPage::makeParserOptions
2655          */
2656         public function makeParserOptions( $context ) {
2657                 return $this->mPage->makeParserOptions( $context );
2658         }
2659
2660         /**
2661          * Call to WikiPage function for backwards compatibility.
2662          * @see WikiPage::pageDataFromId
2663          */
2664         public function pageDataFromId( $dbr, $id, $options = [] ) {
2665                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2666         }
2667
2668         /**
2669          * Call to WikiPage function for backwards compatibility.
2670          * @see WikiPage::pageDataFromTitle
2671          */
2672         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2673                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2674         }
2675
2676         /**
2677          * Call to WikiPage function for backwards compatibility.
2678          * @see WikiPage::prepareContentForEdit
2679          */
2680         public function prepareContentForEdit(
2681                 Content $content, $revision = null, User $user = null,
2682                 $serialFormat = null, $useCache = true
2683         ) {
2684                 return $this->mPage->prepareContentForEdit(
2685                         $content, $revision, $user,
2686                         $serialFormat, $useCache
2687                 );
2688         }
2689
2690         /**
2691          * Call to WikiPage function for backwards compatibility.
2692          * @see WikiPage::protectDescription
2693          */
2694         public function protectDescription( array $limit, array $expiry ) {
2695                 return $this->mPage->protectDescription( $limit, $expiry );
2696         }
2697
2698         /**
2699          * Call to WikiPage function for backwards compatibility.
2700          * @see WikiPage::protectDescriptionLog
2701          */
2702         public function protectDescriptionLog( array $limit, array $expiry ) {
2703                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2704         }
2705
2706         /**
2707          * Call to WikiPage function for backwards compatibility.
2708          * @see WikiPage::replaceSectionAtRev
2709          */
2710         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2711                 $sectionTitle = '', $baseRevId = null
2712         ) {
2713                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2714                         $sectionTitle, $baseRevId
2715                 );
2716         }
2717
2718         /**
2719          * Call to WikiPage function for backwards compatibility.
2720          * @see WikiPage::replaceSectionContent
2721          */
2722         public function replaceSectionContent(
2723                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2724         ) {
2725                 return $this->mPage->replaceSectionContent(
2726                         $sectionId, $sectionContent, $sectionTitle, $edittime
2727                 );
2728         }
2729
2730         /**
2731          * Call to WikiPage function for backwards compatibility.
2732          * @see WikiPage::setTimestamp
2733          */
2734         public function setTimestamp( $ts ) {
2735                 return $this->mPage->setTimestamp( $ts );
2736         }
2737
2738         /**
2739          * Call to WikiPage function for backwards compatibility.
2740          * @see WikiPage::shouldCheckParserCache
2741          */
2742         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2743                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2744         }
2745
2746         /**
2747          * Call to WikiPage function for backwards compatibility.
2748          * @see WikiPage::supportsSections
2749          */
2750         public function supportsSections() {
2751                 return $this->mPage->supportsSections();
2752         }
2753
2754         /**
2755          * Call to WikiPage function for backwards compatibility.
2756          * @see WikiPage::triggerOpportunisticLinksUpdate
2757          */
2758         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2759                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2760         }
2761
2762         /**
2763          * Call to WikiPage function for backwards compatibility.
2764          * @see WikiPage::updateCategoryCounts
2765          */
2766         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2767                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2768         }
2769
2770         /**
2771          * Call to WikiPage function for backwards compatibility.
2772          * @see WikiPage::updateIfNewerOn
2773          */
2774         public function updateIfNewerOn( $dbw, $revision ) {
2775                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2776         }
2777
2778         /**
2779          * Call to WikiPage function for backwards compatibility.
2780          * @see WikiPage::updateRedirectOn
2781          */
2782         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2783                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2784         }
2785
2786         /**
2787          * Call to WikiPage function for backwards compatibility.
2788          * @see WikiPage::updateRevisionOn
2789          */
2790         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2791                 $lastRevIsRedirect = null
2792         ) {
2793                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2794                         $lastRevIsRedirect
2795                 );
2796         }
2797
2798         /**
2799          * @param array $limit
2800          * @param array $expiry
2801          * @param bool &$cascade
2802          * @param string $reason
2803          * @param User $user
2804          * @return Status
2805          */
2806         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2807                 $reason, User $user
2808         ) {
2809                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2810         }
2811
2812         /**
2813          * @param array $limit
2814          * @param string $reason
2815          * @param int &$cascade
2816          * @param array $expiry
2817          * @return bool
2818          */
2819         public function updateRestrictions( $limit = [], $reason = '',
2820                 &$cascade = 0, $expiry = []
2821         ) {
2822                 return $this->mPage->doUpdateRestrictions(
2823                         $limit,
2824                         $expiry,
2825                         $cascade,
2826                         $reason,
2827                         $this->getContext()->getUser()
2828                 );
2829         }
2830
2831         /**
2832          * @param string $reason
2833          * @param bool $suppress
2834          * @param int|null $u1 Unused
2835          * @param bool|null $u2 Unused
2836          * @param string &$error
2837          * @param bool $immediate false allows deleting over time via the job queue
2838          * @return bool
2839          * @throws FatalError
2840          * @throws MWException
2841          */
2842         public function doDeleteArticle(
2843                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2844         ) {
2845                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2846                         null, $immediate );
2847         }
2848
2849         /**
2850          * @param string $fromP
2851          * @param string $summary
2852          * @param string $token
2853          * @param bool $bot
2854          * @param array &$resultDetails
2855          * @param User|null $user
2856          * @return array
2857          */
2858         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2859                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2860                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2861         }
2862
2863         /**
2864          * @param string $fromP
2865          * @param string $summary
2866          * @param bool $bot
2867          * @param array &$resultDetails
2868          * @param User|null $guser
2869          * @return array
2870          */
2871         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2872                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2873                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2874         }
2875
2876         /**
2877          * @param bool &$hasHistory
2878          * @return mixed
2879          */
2880         public function generateReason( &$hasHistory ) {
2881                 $title = $this->mPage->getTitle();
2882                 $handler = ContentHandler::getForTitle( $title );
2883                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2884         }
2885
2886         // ******
2887 }