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