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