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