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
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  */
  34 class Article implements Page {
  35         /** @var IContextSource The context this Article is executed in */
  36         protected $mContext;
  37
  38         /** @var WikiPage The WikiPage object of this instance */
  39         protected $mPage;
  40
  41         /** @var ParserOptions ParserOptions object for $wgUser articles */
  42         public $mParserOptions;
  43
  44         /**
  45          * @var string Text of the revision we are working on
  46          * @todo BC cruft
  47          */
  48         public $mContent;
  49
  50         /**
  51          * @var Content Content of the revision we are working on
  52          * @since 1.21
  53          */
  54         public $mContentObject;
  55
  56         /** @var bool Is the content ($mContent) already loaded? */
  57         public $mContentLoaded = false;
  58
  59         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  60         public $mOldId;
  61
  62         /** @var Title Title from which we were redirected here */
  63         public $mRedirectedFrom = null;
  64
  65         /** @var string|bool URL to redirect to or false if none */
  66         public $mRedirectUrl = false;
  67
  68         /** @var int Revision ID of revision we are working on */
  69         public $mRevIdFetched = 0;
  70
  71         /** @var Revision Revision we are working on */
  72         public $mRevision = null;
  73
  74         /** @var ParserOutput */
  75         public $mParserOutput;
  76
  77         /**
  78          * Constructor and clear the article
  79          * @param Title $title Reference to a Title object.
  80          * @param int $oldId Revision ID, null to fetch from request, zero for current
  81          */
  82         public function __construct( Title $title, $oldId = null ) {
  83                 $this->mOldId = $oldId;
  84                 $this->mPage = $this->newPage( $title );
  85         }
  86
  87         /**
  88          * @param Title $title
  89          * @return WikiPage
  90          */
  91         protected function newPage( Title $title ) {
  92                 return new WikiPage( $title );
  93         }
  94
  95         /**
  96          * Constructor from a page id
  97          * @param int $id Article ID to load
  98          * @return Article|null
  99          */
 100         public static function newFromID( $id ) {
 101                 $t = Title::newFromID( $id );
 102                 return $t == null ? null : new static( $t );
 103         }
 104
 105         /**
 106          * Create an Article object of the appropriate class for the given page.
 107          *
 108          * @param Title $title
 109          * @param IContextSource $context
 110          * @return Article
 111          */
 112         public static function newFromTitle( $title, IContextSource $context ) {
 113                 if ( NS_MEDIA == $title->getNamespace() ) {
 114                         // FIXME: where should this go?
 115                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 116                 }
 117
 118                 $page = null;
 119                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 120                 if ( !$page ) {
 121                         switch ( $title->getNamespace() ) {
 122                                 case NS_FILE:
 123                                         $page = new ImagePage( $title );
 124                                         break;
 125                                 case NS_CATEGORY:
 126                                         $page = new CategoryPage( $title );
 127                                         break;
 128                                 default:
 129                                         $page = new Article( $title );
 130                         }
 131                 }
 132                 $page->setContext( $context );
 133
 134                 return $page;
 135         }
 136
 137         /**
 138          * Create an Article object of the appropriate class for the given page.
 139          *
 140          * @param WikiPage $page
 141          * @param IContextSource $context
 142          * @return Article
 143          */
 144         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 145                 $article = self::newFromTitle( $page->getTitle(), $context );
 146                 $article->mPage = $page; // override to keep process cached vars
 147                 return $article;
 148         }
 149
 150         /**
 151          * Get the page this view was redirected from
 152          * @return Title|null
 153          * @since 1.28
 154          */
 155         public function getRedirectedFrom() {
 156                 return $this->mRedirectedFrom;
 157         }
 158
 159         /**
 160          * Tell the page view functions that this view was redirected
 161          * from another page on the wiki.
 162          * @param Title $from
 163          */
 164         public function setRedirectedFrom( Title $from ) {
 165                 $this->mRedirectedFrom = $from;
 166         }
 167
 168         /**
 169          * Get the title object of the article
 170          *
 171          * @return Title Title object of this page
 172          */
 173         public function getTitle() {
 174                 return $this->mPage->getTitle();
 175         }
 176
 177         /**
 178          * Get the WikiPage object of this instance
 179          *
 180          * @since 1.19
 181          * @return WikiPage
 182          */
 183         public function getPage() {
 184                 return $this->mPage;
 185         }
 186
 187         /**
 188          * Clear the object
 189          */
 190         public function clear() {
 191                 $this->mContentLoaded = false;
 192
 193                 $this->mRedirectedFrom = null; # Title object if set
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196
 197                 $this->mPage->clear();
 198         }
 199
 200         /**
 201          * Returns a Content object representing the pages effective display content,
 202          * not necessarily the revision's content!
 203          *
 204          * Note that getContent does not follow redirects anymore.
 205          * If you need to fetch redirectable content easily, try
 206          * the shortcut in WikiPage::getRedirectTarget()
 207          *
 208          * This function has side effects! Do not use this function if you
 209          * only want the real revision text if any.
 210          *
 211          * @return Content Return the content of this revision
 212          *
 213          * @since 1.21
 214          */
 215         protected function getContentObject() {
 216
 217                 if ( $this->mPage->getId() === 0 ) {
 218                         # If this is a MediaWiki:x message, then load the messages
 219                         # and return the message value for x.
 220                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 221                                 $text = $this->getTitle()->getDefaultMessageText();
 222                                 if ( $text === false ) {
 223                                         $text = '';
 224                                 }
 225
 226                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 227                         } else {
 228                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 229                                 $content = new MessageContent( $message, null, 'parsemag' );
 230                         }
 231                 } else {
 232                         $this->fetchContentObject();
 233                         $content = $this->mContentObject;
 234                 }
 235
 236                 return $content;
 237         }
 238
 239         /**
 240          * @return int The oldid of the article that is to be shown, 0 for the current revision
 241          */
 242         public function getOldID() {
 243                 if ( is_null( $this->mOldId ) ) {
 244                         $this->mOldId = $this->getOldIDFromRequest();
 245                 }
 246
 247                 return $this->mOldId;
 248         }
 249
 250         /**
 251          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 252          *
 253          * @return int The old id for the request
 254          */
 255         public function getOldIDFromRequest() {
 256                 $this->mRedirectUrl = false;
 257
 258                 $request = $this->getContext()->getRequest();
 259                 $oldid = $request->getIntOrNull( 'oldid' );
 260
 261                 if ( $oldid === null ) {
 262                         return 0;
 263                 }
 264
 265                 if ( $oldid !== 0 ) {
 266                         # Load the given revision and check whether the page is another one.
 267                         # In that case, update this instance to reflect the change.
 268                         if ( $oldid === $this->mPage->getLatest() ) {
 269                                 $this->mRevision = $this->mPage->getRevision();
 270                         } else {
 271                                 $this->mRevision = Revision::newFromId( $oldid );
 272                                 if ( $this->mRevision !== null ) {
 273                                         // Revision title doesn't match the page title given?
 274                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 275                                                 $function = [ get_class( $this->mPage ), 'newFromID' ];
 276                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 277                                         }
 278                                 }
 279                         }
 280                 }
 281
 282                 if ( $request->getVal( 'direction' ) == 'next' ) {
 283                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 284                         if ( $nextid ) {
 285                                 $oldid = $nextid;
 286                                 $this->mRevision = null;
 287                         } else {
 288                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 289                         }
 290                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 291                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 292                         if ( $previd ) {
 293                                 $oldid = $previd;
 294                                 $this->mRevision = null;
 295                         }
 296                 }
 297
 298                 return $oldid;
 299         }
 300
 301         /**
 302          * Get text content object
 303          * Does *NOT* follow redirects.
 304          * @todo When is this null?
 305          *
 306          * @note Code that wants to retrieve page content from the database should
 307          * use WikiPage::getContent().
 308          *
 309          * @return Content|null|bool
 310          *
 311          * @since 1.21
 312          */
 313         protected function fetchContentObject() {
 314                 if ( $this->mContentLoaded ) {
 315                         return $this->mContentObject;
 316                 }
 317
 318                 $this->mContentLoaded = true;
 319                 $this->mContent = null;
 320
 321                 $oldid = $this->getOldID();
 322
 323                 # Pre-fill content with error message so that if something
 324                 # fails we'll have something telling us what we intended.
 325                 // XXX: this isn't page content but a UI message. horrible.
 326                 $this->mContentObject = new MessageContent( 'missing-revision', [ $oldid ] );
 327
 328                 if ( $oldid ) {
 329                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 330                         if ( !$this->mRevision ) {
 331                                 $this->mRevision = Revision::newFromId( $oldid );
 332                                 if ( !$this->mRevision ) {
 333                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 334                                         return false;
 335                                 }
 336                         }
 337                 } else {
 338                         $oldid = $this->mPage->getLatest();
 339                         if ( !$oldid ) {
 340                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 341                                         $this->getTitle()->getPrefixedText() . "\n" );
 342                                 return false;
 343                         }
 344
 345                         # Update error message with correct oldid
 346                         $this->mContentObject = new MessageContent( 'missing-revision', [ $oldid ] );
 347
 348                         $this->mRevision = $this->mPage->getRevision();
 349
 350                         if ( !$this->mRevision ) {
 351                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id $oldid\n" );
 352                                 return false;
 353                         }
 354                 }
 355
 356                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 357                 // We should instead work with the Revision object when we need it...
 358                 // Loads if user is allowed
 359                 $content = $this->mRevision->getContent(
 360                         Revision::FOR_THIS_USER,
 361                         $this->getContext()->getUser()
 362                 );
 363
 364                 if ( !$content ) {
 365                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 366                                 $this->mRevision->getId() . "\n" );
 367                         return false;
 368                 }
 369
 370                 $this->mContentObject = $content;
 371                 $this->mRevIdFetched = $this->mRevision->getId();
 372
 373                 // Avoid PHP 7.1 warning of passing $this by reference
 374                 $articlePage = $this;
 375
 376                 Hooks::run(
 377                         'ArticleAfterFetchContentObject',
 378                         [ &$articlePage, &$this->mContentObject ]
 379                 );
 380
 381                 return $this->mContentObject;
 382         }
 383
 384         /**
 385          * Returns true if the currently-referenced revision is the current edit
 386          * to this page (and it exists).
 387          * @return bool
 388          */
 389         public function isCurrent() {
 390                 # If no oldid, this is the current version.
 391                 if ( $this->getOldID() == 0 ) {
 392                         return true;
 393                 }
 394
 395                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 396         }
 397
 398         /**
 399          * Get the fetched Revision object depending on request parameters or null
 400          * on failure.
 401          *
 402          * @since 1.19
 403          * @return Revision|null
 404          */
 405         public function getRevisionFetched() {
 406                 $this->fetchContentObject();
 407
 408                 return $this->mRevision;
 409         }
 410
 411         /**
 412          * Use this to fetch the rev ID used on page views
 413          *
 414          * @return int Revision ID of last article revision
 415          */
 416         public function getRevIdFetched() {
 417                 if ( $this->mRevIdFetched ) {
 418                         return $this->mRevIdFetched;
 419                 } else {
 420                         return $this->mPage->getLatest();
 421                 }
 422         }
 423
 424         /**
 425          * This is the default action of the index.php entry point: just view the
 426          * page of the given title.
 427          */
 428         public function view() {
 429                 global $wgUseFileCache, $wgDebugToolbar;
 430
 431                 # Get variables from query string
 432                 # As side effect this will load the revision and update the title
 433                 # in a revision ID is passed in the request, so this should remain
 434                 # the first call of this method even if $oldid is used way below.
 435                 $oldid = $this->getOldID();
 436
 437                 $user = $this->getContext()->getUser();
 438                 # Another whitelist check in case getOldID() is altering the title
 439                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 440                 if ( count( $permErrors ) ) {
 441                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 442                         throw new PermissionsError( 'read', $permErrors );
 443                 }
 444
 445                 $outputPage = $this->getContext()->getOutput();
 446                 # getOldID() may as well want us to redirect somewhere else
 447                 if ( $this->mRedirectUrl ) {
 448                         $outputPage->redirect( $this->mRedirectUrl );
 449                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 450
 451                         return;
 452                 }
 453
 454                 # If we got diff in the query, we want to see a diff page instead of the article.
 455                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 456                         wfDebug( __METHOD__ . ": showing diff page\n" );
 457                         $this->showDiffPage();
 458
 459                         return;
 460                 }
 461
 462                 # Set page title (may be overridden by DISPLAYTITLE)
 463                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 464
 465                 $outputPage->setArticleFlag( true );
 466                 # Allow frames by default
 467                 $outputPage->allowClickjacking();
 468
 469                 $parserCache = ParserCache::singleton();
 470
 471                 $parserOptions = $this->getParserOptions();
 472                 # Render printable version, use printable version cache
 473                 if ( $outputPage->isPrintable() ) {
 474                         $parserOptions->setIsPrintable( true );
 475                         $parserOptions->setEditSection( false );
 476                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 477                         $parserOptions->setEditSection( false );
 478                 }
 479
 480                 # Try client and file cache
 481                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 482                         # Try to stream the output from file cache
 483                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 484                                 wfDebug( __METHOD__ . ": done file cache\n" );
 485                                 # tell wgOut that output is taken care of
 486                                 $outputPage->disable();
 487                                 $this->mPage->doViewUpdates( $user, $oldid );
 488
 489                                 return;
 490                         }
 491                 }
 492
 493                 # Should the parser cache be used?
 494                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 495                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 496                 if ( $user->getStubThreshold() ) {
 497                         $this->getContext()->getStats()->increment( 'pcache_miss_stub' );
 498                 }
 499
 500                 $this->showRedirectedFromHeader();
 501                 $this->showNamespaceHeader();
 502
 503                 # Iterate through the possible ways of constructing the output text.
 504                 # Keep going until $outputDone is set, or we run out of things to do.
 505                 $pass = 0;
 506                 $outputDone = false;
 507                 $this->mParserOutput = false;
 508
 509                 while ( !$outputDone && ++$pass ) {
 510                         switch ( $pass ) {
 511                                 case 1:
 512                                         // Avoid PHP 7.1 warning of passing $this by reference
 513                                         $articlePage = $this;
 514                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 515                                         break;
 516                                 case 2:
 517                                         # Early abort if the page doesn't exist
 518                                         if ( !$this->mPage->exists() ) {
 519                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 520                                                 $this->showMissingArticle();
 521                                                 $this->mPage->doViewUpdates( $user );
 522                                                 return;
 523                                         }
 524
 525                                         # Try the parser cache
 526                                         if ( $useParserCache ) {
 527                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 528
 529                                                 if ( $this->mParserOutput !== false ) {
 530                                                         if ( $oldid ) {
 531                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 532                                                                 $this->setOldSubtitle( $oldid );
 533                                                         } else {
 534                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 535                                                         }
 536                                                         $outputPage->addParserOutput( $this->mParserOutput );
 537                                                         # Ensure that UI elements requiring revision ID have
 538                                                         # the correct version information.
 539                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 540                                                         # Preload timestamp to avoid a DB hit
 541                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 542                                                         if ( $cachedTimestamp !== null ) {
 543                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 544                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 545                                                         }
 546                                                         $outputDone = true;
 547                                                 }
 548                                         }
 549                                         break;
 550                                 case 3:
 551                                         # This will set $this->mRevision if needed
 552                                         $this->fetchContentObject();
 553
 554                                         # Are we looking at an old revision
 555                                         if ( $oldid && $this->mRevision ) {
 556                                                 $this->setOldSubtitle( $oldid );
 557
 558                                                 if ( !$this->showDeletedRevisionHeader() ) {
 559                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 560                                                         return;
 561                                                 }
 562                                         }
 563
 564                                         # Ensure that UI elements requiring revision ID have
 565                                         # the correct version information.
 566                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 567                                         # Preload timestamp to avoid a DB hit
 568                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 569
 570                                         if ( !Hooks::run( 'ArticleContentViewCustom',
 571                                                         [ $this->fetchContentObject(), $this->getTitle(), $outputPage ] ) ) {
 572
 573                                                 # Allow extensions do their own custom view for certain pages
 574                                                 $outputDone = true;
 575                                         }
 576                                         break;
 577                                 case 4:
 578                                         # Run the parse, protected by a pool counter
 579                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 580
 581                                         $content = $this->getContentObject();
 582                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 583                                                 $this->getRevIdFetched(), $useParserCache, $content );
 584
 585                                         if ( !$poolArticleView->execute() ) {
 586                                                 $error = $poolArticleView->getError();
 587                                                 if ( $error ) {
 588                                                         $outputPage->clearHTML(); // for release() errors
 589                                                         $outputPage->enableClientCache( false );
 590                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 591
 592                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 593                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 594                                                 }
 595                                                 # Connection or timeout error
 596                                                 return;
 597                                         }
 598
 599                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 600                                         $outputPage->addParserOutput( $this->mParserOutput );
 601                                         if ( $content->getRedirectTarget() ) {
 602                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 603                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 604                                         }
 605
 606                                         # Don't cache a dirty ParserOutput object
 607                                         if ( $poolArticleView->getIsDirty() ) {
 608                                                 $outputPage->setCdnMaxage( 0 );
 609                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 610                                                         "sending anyway due to pool overload-->\n" );
 611                                         }
 612
 613                                         $outputDone = true;
 614                                         break;
 615                                 # Should be unreachable, but just in case...
 616                                 default:
 617                                         break 2;
 618                         }
 619                 }
 620
 621                 # Get the ParserOutput actually *displayed* here.
 622                 # Note that $this->mParserOutput is the *current*/oldid version output.
 623                 $pOutput = ( $outputDone instanceof ParserOutput )
 624                         ? $outputDone // object fetched by hook
 625                         : $this->mParserOutput;
 626
 627                 # Adjust title for main page & pages with displaytitle
 628                 if ( $pOutput ) {
 629                         $this->adjustDisplayTitle( $pOutput );
 630                 }
 631
 632                 # For the main page, overwrite the <title> element with the con-
 633                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 634                 # that's not empty).
 635                 # This message always exists because it is in the i18n files
 636                 if ( $this->getTitle()->isMainPage() ) {
 637                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 638                         if ( !$msg->isDisabled() ) {
 639                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 640                         }
 641                 }
 642
 643                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 644                 # This could use getTouched(), but that could be scary for major template edits.
 645                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 646
 647                 # Check for any __NOINDEX__ tags on the page using $pOutput
 648                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 649                 $outputPage->setIndexPolicy( $policy['index'] );
 650                 $outputPage->setFollowPolicy( $policy['follow'] );
 651
 652                 $this->showViewFooter();
 653                 $this->mPage->doViewUpdates( $user, $oldid );
 654
 655                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 656         }
 657
 658         /**
 659          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 660          * @param ParserOutput $pOutput
 661          */
 662         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 663                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 664                 $titleText = $pOutput->getTitleText();
 665                 if ( strval( $titleText ) !== '' ) {
 666                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 667                 }
 668         }
 669
 670         /**
 671          * Show a diff page according to current request variables. For use within
 672          * Article::view() only, other callers should use the DifferenceEngine class.
 673          */
 674         protected function showDiffPage() {
 675                 $request = $this->getContext()->getRequest();
 676                 $user = $this->getContext()->getUser();
 677                 $diff = $request->getVal( 'diff' );
 678                 $rcid = $request->getVal( 'rcid' );
 679                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 680                 $purge = $request->getVal( 'action' ) == 'purge';
 681                 $unhide = $request->getInt( 'unhide' ) == 1;
 682                 $oldid = $this->getOldID();
 683
 684                 $rev = $this->getRevisionFetched();
 685
 686                 if ( !$rev ) {
 687                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 688                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 689                                 ->params( $oldid )
 690                                 ->numParams( 1 )
 691                                 ->parseAsBlock();
 692                         $this->getContext()->getOutput()->addHTML( $msg );
 693                         return;
 694                 }
 695
 696                 $contentHandler = $rev->getContentHandler();
 697                 $de = $contentHandler->createDifferenceEngine(
 698                         $this->getContext(),
 699                         $oldid,
 700                         $diff,
 701                         $rcid,
 702                         $purge,
 703                         $unhide
 704                 );
 705
 706                 // DifferenceEngine directly fetched the revision:
 707                 $this->mRevIdFetched = $de->mNewid;
 708                 $de->showDiffPage( $diffOnly );
 709
 710                 // Run view updates for the newer revision being diffed (and shown
 711                 // below the diff if not $diffOnly).
 712                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 713                 // New can be false, convert it to 0 - this conveniently means the latest revision
 714                 $this->mPage->doViewUpdates( $user, (int)$new );
 715         }
 716
 717         /**
 718          * Get the robot policy to be used for the current view
 719          * @param string $action The action= GET parameter
 720          * @param ParserOutput|null $pOutput
 721          * @return array The policy that should be set
 722          * @todo actions other than 'view'
 723          */
 724         public function getRobotPolicy( $action, $pOutput = null ) {
 725                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 726
 727                 $ns = $this->getTitle()->getNamespace();
 728
 729                 # Don't index user and user talk pages for blocked users (T13443)
 730                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 731                         $specificTarget = null;
 732                         $vagueTarget = null;
 733                         $titleText = $this->getTitle()->getText();
 734                         if ( IP::isValid( $titleText ) ) {
 735                                 $vagueTarget = $titleText;
 736                         } else {
 737                                 $specificTarget = $titleText;
 738                         }
 739                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 740                                 return [
 741                                         'index' => 'noindex',
 742                                         'follow' => 'nofollow'
 743                                 ];
 744                         }
 745                 }
 746
 747                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 748                         # Non-articles (special pages etc), and old revisions
 749                         return [
 750                                 'index' => 'noindex',
 751                                 'follow' => 'nofollow'
 752                         ];
 753                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 754                         # Discourage indexing of printable versions, but encourage following
 755                         return [
 756                                 'index' => 'noindex',
 757                                 'follow' => 'follow'
 758                         ];
 759                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 760                         # For ?curid=x urls, disallow indexing
 761                         return [
 762                                 'index' => 'noindex',
 763                                 'follow' => 'follow'
 764                         ];
 765                 }
 766
 767                 # Otherwise, construct the policy based on the various config variables.
 768                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 769
 770                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 771                         # Honour customised robot policies for this namespace
 772                         $policy = array_merge(
 773                                 $policy,
 774                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 775                         );
 776                 }
 777                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 778                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 779                         # a final sanity check that we have really got the parser output.
 780                         $policy = array_merge(
 781                                 $policy,
 782                                 [ 'index' => $pOutput->getIndexPolicy() ]
 783                         );
 784                 }
 785
 786                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 787                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
 788                         $policy = array_merge(
 789                                 $policy,
 790                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 791                         );
 792                 }
 793
 794                 return $policy;
 795         }
 796
 797         /**
 798          * Converts a String robot policy into an associative array, to allow
 799          * merging of several policies using array_merge().
 800          * @param array|string $policy Returns empty array on null/false/'', transparent
 801          *   to already-converted arrays, converts string.
 802          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 803          */
 804         public static function formatRobotPolicy( $policy ) {
 805                 if ( is_array( $policy ) ) {
 806                         return $policy;
 807                 } elseif ( !$policy ) {
 808                         return [];
 809                 }
 810
 811                 $policy = explode( ',', $policy );
 812                 $policy = array_map( 'trim', $policy );
 813
 814                 $arr = [];
 815                 foreach ( $policy as $var ) {
 816                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
 817                                 $arr['index'] = $var;
 818                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
 819                                 $arr['follow'] = $var;
 820                         }
 821                 }
 822
 823                 return $arr;
 824         }
 825
 826         /**
 827          * If this request is a redirect view, send "redirected from" subtitle to
 828          * the output. Returns true if the header was needed, false if this is not
 829          * a redirect view. Handles both local and remote redirects.
 830          *
 831          * @return bool
 832          */
 833         public function showRedirectedFromHeader() {
 834                 global $wgRedirectSources;
 835
 836                 $context = $this->getContext();
 837                 $outputPage = $context->getOutput();
 838                 $request = $context->getRequest();
 839                 $rdfrom = $request->getVal( 'rdfrom' );
 840
 841                 // Construct a URL for the current page view, but with the target title
 842                 $query = $request->getValues();
 843                 unset( $query['rdfrom'] );
 844                 unset( $query['title'] );
 845                 if ( $this->getTitle()->isRedirect() ) {
 846                         // Prevent double redirects
 847                         $query['redirect'] = 'no';
 848                 }
 849                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 850
 851                 if ( isset( $this->mRedirectedFrom ) ) {
 852                         // Avoid PHP 7.1 warning of passing $this by reference
 853                         $articlePage = $this;
 854
 855                         // This is an internally redirected page view.
 856                         // We'll need a backlink to the source page for navigation.
 857                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
 858                                 $redir = Linker::linkKnown(
 859                                         $this->mRedirectedFrom,
 860                                         null,
 861                                         [],
 862                                         [ 'redirect' => 'no' ]
 863                                 );
 864
 865                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 866                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 867                                 . "</span>" );
 868
 869                                 // Add the script to update the displayed URL and
 870                                 // set the fragment if one was specified in the redirect
 871                                 $outputPage->addJsConfigVars( [
 872                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 873                                 ] );
 874                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 875
 876                                 // Add a <link rel="canonical"> tag
 877                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
 878
 879                                 // Tell the output object that the user arrived at this article through a redirect
 880                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 881
 882                                 return true;
 883                         }
 884                 } elseif ( $rdfrom ) {
 885                         // This is an externally redirected view, from some other wiki.
 886                         // If it was reported from a trusted site, supply a backlink.
 887                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 888                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 889                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 890                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 891                                 . "</span>" );
 892
 893                                 // Add the script to update the displayed URL
 894                                 $outputPage->addJsConfigVars( [
 895                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 896                                 ] );
 897                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 898
 899                                 return true;
 900                         }
 901                 }
 902
 903                 return false;
 904         }
 905
 906         /**
 907          * Show a header specific to the namespace currently being viewed, like
 908          * [[MediaWiki:Talkpagetext]]. For Article::view().
 909          */
 910         public function showNamespaceHeader() {
 911                 if ( $this->getTitle()->isTalkPage() ) {
 912                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 913                                 $this->getContext()->getOutput()->wrapWikiMsg(
 914                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
 915                                         [ 'talkpageheader' ]
 916                                 );
 917                         }
 918                 }
 919         }
 920
 921         /**
 922          * Show the footer section of an ordinary page view
 923          */
 924         public function showViewFooter() {
 925                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 926                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
 927                         && IP::isValid( $this->getTitle()->getText() )
 928                 ) {
 929                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
 930                 }
 931
 932                 // Show a footer allowing the user to patrol the shown revision or page if possible
 933                 $patrolFooterShown = $this->showPatrolFooter();
 934
 935                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
 936         }
 937
 938         /**
 939          * If patrol is possible, output a patrol UI box. This is called from the
 940          * footer section of ordinary page views. If patrol is not possible or not
 941          * desired, does nothing.
 942          * Side effect: When the patrol link is build, this method will call
 943          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
 944          *
 945          * @return bool
 946          */
 947         public function showPatrolFooter() {
 948                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol, $wgEnableAPI, $wgEnableWriteAPI;
 949
 950                 $outputPage = $this->getContext()->getOutput();
 951                 $user = $this->getContext()->getUser();
 952                 $title = $this->getTitle();
 953                 $rc = false;
 954
 955                 if ( !$title->quickUserCan( 'patrol', $user )
 956                         || !( $wgUseRCPatrol || $wgUseNPPatrol
 957                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
 958                 ) {
 959                         // Patrolling is disabled or the user isn't allowed to
 960                         return false;
 961                 }
 962
 963                 if ( $this->mRevision
 964                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
 965                 ) {
 966                         // The current revision is already older than what could be in the RC table
 967                         // 6h tolerance because the RC might not be cleaned out regularly
 968                         return false;
 969                 }
 970
 971                 // Check for cached results
 972                 $key = wfMemcKey( 'unpatrollable-page', $title->getArticleID() );
 973                 $cache = ObjectCache::getMainWANInstance();
 974                 if ( $cache->get( $key ) ) {
 975                         return false;
 976                 }
 977
 978                 $dbr = wfGetDB( DB_REPLICA );
 979                 $oldestRevisionTimestamp = $dbr->selectField(
 980                         'revision',
 981                         'MIN( rev_timestamp )',
 982                         [ 'rev_page' => $title->getArticleID() ],
 983                         __METHOD__
 984                 );
 985
 986                 // New page patrol: Get the timestamp of the oldest revison which
 987                 // the revision table holds for the given page. Then we look
 988                 // whether it's within the RC lifespan and if it is, we try
 989                 // to get the recentchanges row belonging to that entry
 990                 // (with rc_new = 1).
 991                 $recentPageCreation = false;
 992                 if ( $oldestRevisionTimestamp
 993                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
 994                 ) {
 995                         // 6h tolerance because the RC might not be cleaned out regularly
 996                         $recentPageCreation = true;
 997                         $rc = RecentChange::newFromConds(
 998                                 [
 999                                         'rc_new' => 1,
1000                                         'rc_timestamp' => $oldestRevisionTimestamp,
1001                                         'rc_namespace' => $title->getNamespace(),
1002                                         'rc_cur_id' => $title->getArticleID()
1003                                 ],
1004                                 __METHOD__
1005                         );
1006                         if ( $rc ) {
1007                                 // Use generic patrol message for new pages
1008                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1009                         }
1010                 }
1011
1012                 // File patrol: Get the timestamp of the latest upload for this page,
1013                 // check whether it is within the RC lifespan and if it is, we try
1014                 // to get the recentchanges row belonging to that entry
1015                 // (with rc_type = RC_LOG, rc_log_type = upload).
1016                 $recentFileUpload = false;
1017                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1018                         && $title->getNamespace() === NS_FILE ) {
1019                         // Retrieve timestamp of most recent upload
1020                         $newestUploadTimestamp = $dbr->selectField(
1021                                 'image',
1022                                 'MAX( img_timestamp )',
1023                                 [ 'img_name' => $title->getDBkey() ],
1024                                 __METHOD__
1025                         );
1026                         if ( $newestUploadTimestamp
1027                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1028                         ) {
1029                                 // 6h tolerance because the RC might not be cleaned out regularly
1030                                 $recentFileUpload = true;
1031                                 $rc = RecentChange::newFromConds(
1032                                         [
1033                                                 'rc_type' => RC_LOG,
1034                                                 'rc_log_type' => 'upload',
1035                                                 'rc_timestamp' => $newestUploadTimestamp,
1036                                                 'rc_namespace' => NS_FILE,
1037                                                 'rc_cur_id' => $title->getArticleID()
1038                                         ],
1039                                         __METHOD__,
1040                                         [ 'USE INDEX' => 'rc_timestamp' ]
1041                                 );
1042                                 if ( $rc ) {
1043                                         // Use patrol message specific to files
1044                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1045                                 }
1046                         }
1047                 }
1048
1049                 if ( !$recentPageCreation && !$recentFileUpload ) {
1050                         // Page creation and latest upload (for files) is too old to be in RC
1051
1052                         // We definitely can't patrol so cache the information
1053                         // When a new file version is uploaded, the cache is cleared
1054                         $cache->set( $key, '1' );
1055
1056                         return false;
1057                 }
1058
1059                 if ( !$rc ) {
1060                         // Don't cache: This can be hit if the page gets accessed very fast after
1061                         // its creation / latest upload or in case we have high replica DB lag. In case
1062                         // the revision is too old, we will already return above.
1063                         return false;
1064                 }
1065
1066                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1067                         // Patrolled RC entry around
1068
1069                         // Cache the information we gathered above in case we can't patrol
1070                         // Don't cache in case we can patrol as this could change
1071                         $cache->set( $key, '1' );
1072
1073                         return false;
1074                 }
1075
1076                 if ( $rc->getPerformer()->equals( $user ) ) {
1077                         // Don't show a patrol link for own creations/uploads. If the user could
1078                         // patrol them, they already would be patrolled
1079                         return false;
1080                 }
1081
1082                 $outputPage->preventClickjacking();
1083                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1084                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1085                 }
1086
1087                 $link = Linker::linkKnown(
1088                         $title,
1089                         $markPatrolledMsg->escaped(),
1090                         [],
1091                         [
1092                                 'action' => 'markpatrolled',
1093                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1094                         ]
1095                 );
1096
1097                 $outputPage->addHTML(
1098                         "<div class='patrollink' data-mw='interface'>" .
1099                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1100                         '</div>'
1101                 );
1102
1103                 return true;
1104         }
1105
1106         /**
1107          * Purge the cache used to check if it is worth showing the patrol footer
1108          * For example, it is done during re-uploads when file patrol is used.
1109          * @param int $articleID ID of the article to purge
1110          * @since 1.27
1111          */
1112         public static function purgePatrolFooterCache( $articleID ) {
1113                 $cache = ObjectCache::getMainWANInstance();
1114                 $cache->delete( wfMemcKey( 'unpatrollable-page', $articleID ) );
1115         }
1116
1117         /**
1118          * Show the error text for a missing article. For articles in the MediaWiki
1119          * namespace, show the default message text. To be called from Article::view().
1120          */
1121         public function showMissingArticle() {
1122                 global $wgSend404Code;
1123
1124                 $outputPage = $this->getContext()->getOutput();
1125                 // Whether the page is a root user page of an existing user (but not a subpage)
1126                 $validUserPage = false;
1127
1128                 $title = $this->getTitle();
1129
1130                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1131                 if ( $title->getNamespace() == NS_USER
1132                         || $title->getNamespace() == NS_USER_TALK
1133                 ) {
1134                         $rootPart = explode( '/', $title->getText() )[0];
1135                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1136                         $ip = User::isIP( $rootPart );
1137                         $block = Block::newFromTarget( $user, $user );
1138
1139                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1140                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1141                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1142                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1143                                 # Show log extract if the user is currently blocked
1144                                 LogEventsList::showLogExtract(
1145                                         $outputPage,
1146                                         'block',
1147                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1148                                         '',
1149                                         [
1150                                                 'lim' => 1,
1151                                                 'showIfEmpty' => false,
1152                                                 'msgKey' => [
1153                                                         'blocked-notice-logextract',
1154                                                         $user->getName() # Support GENDER in notice
1155                                                 ]
1156                                         ]
1157                                 );
1158                                 $validUserPage = !$title->isSubpage();
1159                         } else {
1160                                 $validUserPage = !$title->isSubpage();
1161                         }
1162                 }
1163
1164                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1165
1166                 # Show delete and move logs if there were any such events.
1167                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1168                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1169                 $cache = ObjectCache::getMainStashInstance();
1170                 $key = wfMemcKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1171                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1172                 if ( $loggedIn || $cache->get( $key ) ) {
1173                         $logTypes = [ 'delete', 'move' ];
1174
1175                         $dbr = wfGetDB( DB_REPLICA );
1176
1177                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1178                         // Give extensions a chance to hide their (unrelated) log entries
1179                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1180                         LogEventsList::showLogExtract(
1181                                 $outputPage,
1182                                 $logTypes,
1183                                 $title,
1184                                 '',
1185                                 [
1186                                         'lim' => 10,
1187                                         'conds' => $conds,
1188                                         'showIfEmpty' => false,
1189                                         'msgKey' => [ $loggedIn
1190                                                 ? 'moveddeleted-notice'
1191                                                 : 'moveddeleted-notice-recent'
1192                                         ]
1193                                 ]
1194                         );
1195                 }
1196
1197                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1198                         // If there's no backing content, send a 404 Not Found
1199                         // for better machine handling of broken links.
1200                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1201                 }
1202
1203                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1204                 $policy = $this->getRobotPolicy( 'view' );
1205                 $outputPage->setIndexPolicy( $policy['index'] );
1206                 $outputPage->setFollowPolicy( $policy['follow'] );
1207
1208                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1209
1210                 if ( !$hookResult ) {
1211                         return;
1212                 }
1213
1214                 # Show error message
1215                 $oldid = $this->getOldID();
1216                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1217                         $outputPage->addParserOutput( $this->getContentObject()->getParserOutput( $title ) );
1218                 } else {
1219                         if ( $oldid ) {
1220                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1221                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1222                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1223                         ) {
1224                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1225                                 $text = wfMessage( $message )->plain();
1226                         } else {
1227                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1228                         }
1229
1230                         $dir = $this->getContext()->getLanguage()->getDir();
1231                         $lang = $this->getContext()->getLanguage()->getCode();
1232                         $outputPage->addWikiText( Xml::openElement( 'div', [
1233                                 'class' => "noarticletext mw-content-$dir",
1234                                 'dir' => $dir,
1235                                 'lang' => $lang,
1236                         ] ) . "\n$text\n</div>" );
1237                 }
1238         }
1239
1240         /**
1241          * If the revision requested for view is deleted, check permissions.
1242          * Send either an error message or a warning header to the output.
1243          *
1244          * @return bool True if the view is allowed, false if not.
1245          */
1246         public function showDeletedRevisionHeader() {
1247                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1248                         // Not deleted
1249                         return true;
1250                 }
1251
1252                 $outputPage = $this->getContext()->getOutput();
1253                 $user = $this->getContext()->getUser();
1254                 // If the user is not allowed to see it...
1255                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1256                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1257                                 'rev-deleted-text-permission' );
1258
1259                         return false;
1260                 // If the user needs to confirm that they want to see it...
1261                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1262                         # Give explanation and add a link to view the revision...
1263                         $oldid = intval( $this->getOldID() );
1264                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1265                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1266                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1267                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1268                                 [ $msg, $link ] );
1269
1270                         return false;
1271                 // We are allowed to see...
1272                 } else {
1273                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1274                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1275                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1276
1277                         return true;
1278                 }
1279         }
1280
1281         /**
1282          * Generate the navigation links when browsing through an article revisions
1283          * It shows the information as:
1284          *   Revision as of \<date\>; view current revision
1285          *   \<- Previous version | Next Version -\>
1286          *
1287          * @param int $oldid Revision ID of this article revision
1288          */
1289         public function setOldSubtitle( $oldid = 0 ) {
1290                 // Avoid PHP 7.1 warning of passing $this by reference
1291                 $articlePage = $this;
1292
1293                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1294                         return;
1295                 }
1296
1297                 $context = $this->getContext();
1298                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1299
1300                 # Cascade unhide param in links for easy deletion browsing
1301                 $extraParams = [];
1302                 if ( $unhide ) {
1303                         $extraParams['unhide'] = 1;
1304                 }
1305
1306                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1307                         $revision = $this->mRevision;
1308                 } else {
1309                         $revision = Revision::newFromId( $oldid );
1310                 }
1311
1312                 $timestamp = $revision->getTimestamp();
1313
1314                 $current = ( $oldid == $this->mPage->getLatest() );
1315                 $language = $context->getLanguage();
1316                 $user = $context->getUser();
1317
1318                 $td = $language->userTimeAndDate( $timestamp, $user );
1319                 $tddate = $language->userDate( $timestamp, $user );
1320                 $tdtime = $language->userTime( $timestamp, $user );
1321
1322                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1323                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1324
1325                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1326                         ? 'revision-info-current'
1327                         : 'revision-info';
1328
1329                 $outputPage = $context->getOutput();
1330                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1331                         $context->msg( $infomsg, $td )
1332                                 ->rawParams( $userlinks )
1333                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1334                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1335                                 ->parse() .
1336                         "</div>";
1337
1338                 $lnk = $current
1339                         ? $context->msg( 'currentrevisionlink' )->escaped()
1340                         : Linker::linkKnown(
1341                                 $this->getTitle(),
1342                                 $context->msg( 'currentrevisionlink' )->escaped(),
1343                                 [],
1344                                 $extraParams
1345                         );
1346                 $curdiff = $current
1347                         ? $context->msg( 'diff' )->escaped()
1348                         : Linker::linkKnown(
1349                                 $this->getTitle(),
1350                                 $context->msg( 'diff' )->escaped(),
1351                                 [],
1352                                 [
1353                                         'diff' => 'cur',
1354                                         'oldid' => $oldid
1355                                 ] + $extraParams
1356                         );
1357                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1358                 $prevlink = $prev
1359                         ? Linker::linkKnown(
1360                                 $this->getTitle(),
1361                                 $context->msg( 'previousrevision' )->escaped(),
1362                                 [],
1363                                 [
1364                                         'direction' => 'prev',
1365                                         'oldid' => $oldid
1366                                 ] + $extraParams
1367                         )
1368                         : $context->msg( 'previousrevision' )->escaped();
1369                 $prevdiff = $prev
1370                         ? Linker::linkKnown(
1371                                 $this->getTitle(),
1372                                 $context->msg( 'diff' )->escaped(),
1373                                 [],
1374                                 [
1375                                         'diff' => 'prev',
1376                                         'oldid' => $oldid
1377                                 ] + $extraParams
1378                         )
1379                         : $context->msg( 'diff' )->escaped();
1380                 $nextlink = $current
1381                         ? $context->msg( 'nextrevision' )->escaped()
1382                         : Linker::linkKnown(
1383                                 $this->getTitle(),
1384                                 $context->msg( 'nextrevision' )->escaped(),
1385                                 [],
1386                                 [
1387                                         'direction' => 'next',
1388                                         'oldid' => $oldid
1389                                 ] + $extraParams
1390                         );
1391                 $nextdiff = $current
1392                         ? $context->msg( 'diff' )->escaped()
1393                         : Linker::linkKnown(
1394                                 $this->getTitle(),
1395                                 $context->msg( 'diff' )->escaped(),
1396                                 [],
1397                                 [
1398                                         'diff' => 'next',
1399                                         'oldid' => $oldid
1400                                 ] + $extraParams
1401                         );
1402
1403                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1404                 if ( $cdel !== '' ) {
1405                         $cdel .= ' ';
1406                 }
1407
1408                 // the outer div is need for styling the revision info and nav in MobileFrontend
1409                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1410                         "<div id=\"mw-revision-nav\">" . $cdel .
1411                         $context->msg( 'revision-nav' )->rawParams(
1412                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1413                         )->escaped() . "</div></div>" );
1414         }
1415
1416         /**
1417          * Return the HTML for the top of a redirect page
1418          *
1419          * Chances are you should just be using the ParserOutput from
1420          * WikitextContent::getParserOutput instead of calling this for redirects.
1421          *
1422          * @param Title|array $target Destination(s) to redirect
1423          * @param bool $appendSubtitle [optional]
1424          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1425          * @return string Containing HTML with redirect link
1426          */
1427         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1428                 $lang = $this->getTitle()->getPageLanguage();
1429                 $out = $this->getContext()->getOutput();
1430                 if ( $appendSubtitle ) {
1431                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1432                 }
1433                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1434                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1435         }
1436
1437         /**
1438          * Return the HTML for the top of a redirect page
1439          *
1440          * Chances are you should just be using the ParserOutput from
1441          * WikitextContent::getParserOutput instead of calling this for redirects.
1442          *
1443          * @since 1.23
1444          * @param Language $lang
1445          * @param Title|array $target Destination(s) to redirect
1446          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1447          * @return string Containing HTML with redirect link
1448          */
1449         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1450                 if ( !is_array( $target ) ) {
1451                         $target = [ $target ];
1452                 }
1453
1454                 $html = '<ul class="redirectText">';
1455                 /** @var Title $title */
1456                 foreach ( $target as $title ) {
1457                         $html .= '<li>' . Linker::link(
1458                                 $title,
1459                                 htmlspecialchars( $title->getFullText() ),
1460                                 [],
1461                                 // Make sure wiki page redirects are not followed
1462                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1463                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1464                         ) . '</li>';
1465                 }
1466                 $html .= '</ul>';
1467
1468                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1469
1470                 return '<div class="redirectMsg">' .
1471                         '<p>' . $redirectToText . '</p>' .
1472                         $html .
1473                         '</div>';
1474         }
1475
1476         /**
1477          * Adds help link with an icon via page indicators.
1478          * Link target can be overridden by a local message containing a wikilink:
1479          * the message key is: 'namespace-' + namespace number + '-helppage'.
1480          * @param string $to Target MediaWiki.org page title or encoded URL.
1481          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1482          * @since 1.25
1483          */
1484         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1485                 $msg = wfMessage(
1486                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1487                 );
1488
1489                 $out = $this->getContext()->getOutput();
1490                 if ( !$msg->isDisabled() ) {
1491                         $helpUrl = Skin::makeUrl( $msg->plain() );
1492                         $out->addHelpLink( $helpUrl, true );
1493                 } else {
1494                         $out->addHelpLink( $to, $overrideBaseUrl );
1495                 }
1496         }
1497
1498         /**
1499          * Handle action=render
1500          */
1501         public function render() {
1502                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1503                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1504                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1505                 $this->view();
1506         }
1507
1508         /**
1509          * action=protect handler
1510          */
1511         public function protect() {
1512                 $form = new ProtectionForm( $this );
1513                 $form->execute();
1514         }
1515
1516         /**
1517          * action=unprotect handler (alias)
1518          */
1519         public function unprotect() {
1520                 $this->protect();
1521         }
1522
1523         /**
1524          * UI entry point for page deletion
1525          */
1526         public function delete() {
1527                 # This code desperately needs to be totally rewritten
1528
1529                 $title = $this->getTitle();
1530                 $context = $this->getContext();
1531                 $user = $context->getUser();
1532                 $request = $context->getRequest();
1533
1534                 # Check permissions
1535                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1536                 if ( count( $permissionErrors ) ) {
1537                         throw new PermissionsError( 'delete', $permissionErrors );
1538                 }
1539
1540                 # Read-only check...
1541                 if ( wfReadOnly() ) {
1542                         throw new ReadOnlyError;
1543                 }
1544
1545                 # Better double-check that it hasn't been deleted yet!
1546                 $this->mPage->loadPageData(
1547                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1548                 );
1549                 if ( !$this->mPage->exists() ) {
1550                         $deleteLogPage = new LogPage( 'delete' );
1551                         $outputPage = $context->getOutput();
1552                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1553                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1554                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1555                                 );
1556                         $outputPage->addHTML(
1557                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1558                         );
1559                         LogEventsList::showLogExtract(
1560                                 $outputPage,
1561                                 'delete',
1562                                 $title
1563                         );
1564
1565                         return;
1566                 }
1567
1568                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1569                 $deleteReason = $request->getText( 'wpReason' );
1570
1571                 if ( $deleteReasonList == 'other' ) {
1572                         $reason = $deleteReason;
1573                 } elseif ( $deleteReason != '' ) {
1574                         // Entry from drop down menu + additional comment
1575                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1576                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1577                 } else {
1578                         $reason = $deleteReasonList;
1579                 }
1580
1581                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1582                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1583                 ) {
1584                         # Flag to hide all contents of the archived revisions
1585                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1586
1587                         $this->doDelete( $reason, $suppress );
1588
1589                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1590
1591                         return;
1592                 }
1593
1594                 // Generate deletion reason
1595                 $hasHistory = false;
1596                 if ( !$reason ) {
1597                         try {
1598                                 $reason = $this->generateReason( $hasHistory );
1599                         } catch ( Exception $e ) {
1600                                 # if a page is horribly broken, we still want to be able to
1601                                 # delete it. So be lenient about errors here.
1602                                 wfDebug( "Error while building auto delete summary: $e" );
1603                                 $reason = '';
1604                         }
1605                 }
1606
1607                 // If the page has a history, insert a warning
1608                 if ( $hasHistory ) {
1609                         $title = $this->getTitle();
1610
1611                         // The following can use the real revision count as this is only being shown for users
1612                         // that can delete this page.
1613                         // This, as a side-effect, also makes sure that the following query isn't being run for
1614                         // pages with a larger history, unless the user has the 'bigdelete' right
1615                         // (and is about to delete this page).
1616                         $dbr = wfGetDB( DB_REPLICA );
1617                         $revisions = $edits = (int)$dbr->selectField(
1618                                 'revision',
1619                                 'COUNT(rev_page)',
1620                                 [ 'rev_page' => $title->getArticleID() ],
1621                                 __METHOD__
1622                         );
1623
1624                         // @todo FIXME: i18n issue/patchwork message
1625                         $context->getOutput()->addHTML(
1626                                 '<strong class="mw-delete-warning-revisions">' .
1627                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1628                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1629                                         $context->msg( 'history' )->escaped(),
1630                                         [],
1631                                         [ 'action' => 'history' ] ) .
1632                                 '</strong>'
1633                         );
1634
1635                         if ( $title->isBigDeletion() ) {
1636                                 global $wgDeleteRevisionsLimit;
1637                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1638                                         [
1639                                                 'delete-warning-toobig',
1640                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1641                                         ]
1642                                 );
1643                         }
1644                 }
1645
1646                 $this->confirmDelete( $reason );
1647         }
1648
1649         /**
1650          * Output deletion confirmation dialog
1651          * @todo FIXME: Move to another file?
1652          * @param string $reason Prefilled reason
1653          */
1654         public function confirmDelete( $reason ) {
1655                 wfDebug( "Article::confirmDelete\n" );
1656
1657                 $title = $this->getTitle();
1658                 $ctx = $this->getContext();
1659                 $outputPage = $ctx->getOutput();
1660                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1661                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1662                 $outputPage->addBacklinkSubtitle( $title );
1663                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1664                 $backlinkCache = $title->getBacklinkCache();
1665                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1666                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1667                                 'deleting-backlinks-warning' );
1668                 }
1669                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1670
1671                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1672
1673                 $user = $this->getContext()->getUser();
1674                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1675                         $suppress = Html::openElement( 'div', [ 'id' => 'wpDeleteSuppressRow' ] ) .
1676                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1677                                         'wpSuppress', 'wpSuppress', false, [ 'tabindex' => '4' ] ) .
1678                                 Html::closeElement( 'div' );
1679                 } else {
1680                         $suppress = '';
1681                 }
1682                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1683                 $form = Html::openElement( 'form', [ 'method' => 'post',
1684                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ] ) .
1685                         Html::openElement( 'fieldset', [ 'id' => 'mw-delete-table' ] ) .
1686                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1687                         Html::openElement( 'div', [ 'id' => 'mw-deleteconfirm-table' ] ) .
1688                         Html::openElement( 'div', [ 'id' => 'wpDeleteReasonListRow' ] ) .
1689                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1690                         '&nbsp;' .
1691                         Xml::listDropDown(
1692                                 'wpDeleteReasonList',
1693                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1694                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1695                                 '',
1696                                 'wpReasonDropDown',
1697                                 1
1698                         ) .
1699                         Html::closeElement( 'div' ) .
1700                         Html::openElement( 'div', [ 'id' => 'wpDeleteReasonRow' ] ) .
1701                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1702                         '&nbsp;' .
1703                         Html::input( 'wpReason', $reason, 'text', [
1704                                 'size' => '60',
1705                                 'maxlength' => '255',
1706                                 'tabindex' => '2',
1707                                 'id' => 'wpReason',
1708                                 'class' => 'mw-ui-input-inline',
1709                                 'autofocus'
1710                         ] ) .
1711                         Html::closeElement( 'div' );
1712
1713                 # Disallow watching if user is not logged in
1714                 if ( $user->isLoggedIn() ) {
1715                         $form .=
1716                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1717                                                 'wpWatch', 'wpWatch', $checkWatch, [ 'tabindex' => '3' ] );
1718                 }
1719
1720                 $form .=
1721                                 Html::openElement( 'div' ) .
1722                                 $suppress .
1723                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1724                                                 [
1725                                                         'name' => 'wpConfirmB',
1726                                                         'id' => 'wpConfirmB',
1727                                                         'tabindex' => '5',
1728                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1729                                                 ]
1730                                         ) .
1731                                 Html::closeElement( 'div' ) .
1732                         Html::closeElement( 'div' ) .
1733                         Xml::closeElement( 'fieldset' ) .
1734                         Html::hidden(
1735                                 'wpEditToken',
1736                                 $user->getEditToken( [ 'delete', $title->getPrefixedText() ] )
1737                         ) .
1738                         Xml::closeElement( 'form' );
1739
1740                         if ( $user->isAllowed( 'editinterface' ) ) {
1741                                 $link = Linker::linkKnown(
1742                                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
1743                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1744                                         [],
1745                                         [ 'action' => 'edit' ]
1746                                 );
1747                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1748                         }
1749
1750                 $outputPage->addHTML( $form );
1751
1752                 $deleteLogPage = new LogPage( 'delete' );
1753                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1754                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1755         }
1756
1757         /**
1758          * Perform a deletion and output success or failure messages
1759          * @param string $reason
1760          * @param bool $suppress
1761          */
1762         public function doDelete( $reason, $suppress = false ) {
1763                 $error = '';
1764                 $context = $this->getContext();
1765                 $outputPage = $context->getOutput();
1766                 $user = $context->getUser();
1767                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user );
1768
1769                 if ( $status->isGood() ) {
1770                         $deleted = $this->getTitle()->getPrefixedText();
1771
1772                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1773                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1774
1775                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1776
1777                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1778
1779                         Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
1780
1781                         $outputPage->returnToMain( false );
1782                 } else {
1783                         $outputPage->setPageTitle(
1784                                 wfMessage( 'cannotdelete-title',
1785                                         $this->getTitle()->getPrefixedText() )
1786                         );
1787
1788                         if ( $error == '' ) {
1789                                 $outputPage->addWikiText(
1790                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1791                                 );
1792                                 $deleteLogPage = new LogPage( 'delete' );
1793                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1794
1795                                 LogEventsList::showLogExtract(
1796                                         $outputPage,
1797                                         'delete',
1798                                         $this->getTitle()
1799                                 );
1800                         } else {
1801                                 $outputPage->addHTML( $error );
1802                         }
1803                 }
1804         }
1805
1806         /* Caching functions */
1807
1808         /**
1809          * checkLastModified returns true if it has taken care of all
1810          * output to the client that is necessary for this request.
1811          * (that is, it has sent a cached version of the page)
1812          *
1813          * @return bool True if cached version send, false otherwise
1814          */
1815         protected function tryFileCache() {
1816                 static $called = false;
1817
1818                 if ( $called ) {
1819                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1820                         return false;
1821                 }
1822
1823                 $called = true;
1824                 if ( $this->isFileCacheable() ) {
1825                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1826                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1827                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1828                                 $cache->loadFromFileCache( $this->getContext() );
1829                                 return true;
1830                         } else {
1831                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1832                                 ob_start( [ &$cache, 'saveToFileCache' ] );
1833                         }
1834                 } else {
1835                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1836                 }
1837
1838                 return false;
1839         }
1840
1841         /**
1842          * Check if the page can be cached
1843          * @param integer $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
1844          * @return bool
1845          */
1846         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
1847                 $cacheable = false;
1848
1849                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
1850                         $cacheable = $this->mPage->getId()
1851                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1852                         // Extension may have reason to disable file caching on some pages.
1853                         if ( $cacheable ) {
1854                                 // Avoid PHP 7.1 warning of passing $this by reference
1855                                 $articlePage = $this;
1856                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
1857                         }
1858                 }
1859
1860                 return $cacheable;
1861         }
1862
1863         /**#@-*/
1864
1865         /**
1866          * Lightweight method to get the parser output for a page, checking the parser cache
1867          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1868          * consider, so it's not appropriate to use there.
1869          *
1870          * @since 1.16 (r52326) for LiquidThreads
1871          *
1872          * @param int|null $oldid Revision ID or null
1873          * @param User $user The relevant user
1874          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1875          */
1876         public function getParserOutput( $oldid = null, User $user = null ) {
1877                 // XXX: bypasses mParserOptions and thus setParserOptions()
1878
1879                 if ( $user === null ) {
1880                         $parserOptions = $this->getParserOptions();
1881                 } else {
1882                         $parserOptions = $this->mPage->makeParserOptions( $user );
1883                 }
1884
1885                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1886         }
1887
1888         /**
1889          * Override the ParserOptions used to render the primary article wikitext.
1890          *
1891          * @param ParserOptions $options
1892          * @throws MWException If the parser options where already initialized.
1893          */
1894         public function setParserOptions( ParserOptions $options ) {
1895                 if ( $this->mParserOptions ) {
1896                         throw new MWException( "can't change parser options after they have already been set" );
1897                 }
1898
1899                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1900                 $this->mParserOptions = clone $options;
1901         }
1902
1903         /**
1904          * Get parser options suitable for rendering the primary article wikitext
1905          * @return ParserOptions
1906          */
1907         public function getParserOptions() {
1908                 if ( !$this->mParserOptions ) {
1909                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1910                 }
1911                 // Clone to allow modifications of the return value without affecting cache
1912                 return clone $this->mParserOptions;
1913         }
1914
1915         /**
1916          * Sets the context this Article is executed in
1917          *
1918          * @param IContextSource $context
1919          * @since 1.18
1920          */
1921         public function setContext( $context ) {
1922                 $this->mContext = $context;
1923         }
1924
1925         /**
1926          * Gets the context this Article is executed in
1927          *
1928          * @return IContextSource
1929          * @since 1.18
1930          */
1931         public function getContext() {
1932                 if ( $this->mContext instanceof IContextSource ) {
1933                         return $this->mContext;
1934                 } else {
1935                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1936                                 "Return RequestContext::getMain(); for sanity\n" );
1937                         return RequestContext::getMain();
1938                 }
1939         }
1940
1941         /**
1942          * Use PHP's magic __get handler to handle accessing of
1943          * raw WikiPage fields for backwards compatibility.
1944          *
1945          * @param string $fname Field name
1946          * @return mixed
1947          */
1948         public function __get( $fname ) {
1949                 if ( property_exists( $this->mPage, $fname ) ) {
1950                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
1951                         return $this->mPage->$fname;
1952                 }
1953                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1954         }
1955
1956         /**
1957          * Use PHP's magic __set handler to handle setting of
1958          * raw WikiPage fields for backwards compatibility.
1959          *
1960          * @param string $fname Field name
1961          * @param mixed $fvalue New value
1962          */
1963         public function __set( $fname, $fvalue ) {
1964                 if ( property_exists( $this->mPage, $fname ) ) {
1965                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
1966                         $this->mPage->$fname = $fvalue;
1967                 // Note: extensions may want to toss on new fields
1968                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
1969                         $this->mPage->$fname = $fvalue;
1970                 } else {
1971                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1972                 }
1973         }
1974
1975         /**
1976          * Call to WikiPage function for backwards compatibility.
1977          * @see WikiPage::checkFlags
1978          */
1979         public function checkFlags( $flags ) {
1980                 return $this->mPage->checkFlags( $flags );
1981         }
1982
1983         /**
1984          * Call to WikiPage function for backwards compatibility.
1985          * @see WikiPage::checkTouched
1986          */
1987         public function checkTouched() {
1988                 return $this->mPage->checkTouched();
1989         }
1990
1991         /**
1992          * Call to WikiPage function for backwards compatibility.
1993          * @see WikiPage::clearPreparedEdit
1994          */
1995         public function clearPreparedEdit() {
1996                 $this->mPage->clearPreparedEdit();
1997         }
1998
1999         /**
2000          * Call to WikiPage function for backwards compatibility.
2001          * @see WikiPage::doDeleteArticleReal
2002          */
2003         public function doDeleteArticleReal(
2004                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2005                 $tags = []
2006         ) {
2007                 return $this->mPage->doDeleteArticleReal(
2008                         $reason, $suppress, $u1, $u2, $error, $user, $tags
2009                 );
2010         }
2011
2012         /**
2013          * Call to WikiPage function for backwards compatibility.
2014          * @see WikiPage::doDeleteUpdates
2015          */
2016         public function doDeleteUpdates( $id, Content $content = null ) {
2017                 return $this->mPage->doDeleteUpdates( $id, $content );
2018         }
2019
2020         /**
2021          * Call to WikiPage function for backwards compatibility.
2022          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2023          * @see WikiPage::doEditContent
2024          */
2025         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
2026                 User $user = null, $serialFormat = null
2027         ) {
2028                 wfDeprecated( __METHOD__, '1.29' );
2029                 return $this->mPage->doEditContent( $content, $summary, $flags, $baseRevId,
2030                         $user, $serialFormat
2031                 );
2032         }
2033
2034         /**
2035          * Call to WikiPage function for backwards compatibility.
2036          * @see WikiPage::doEditUpdates
2037          */
2038         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2039                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2040         }
2041
2042         /**
2043          * Call to WikiPage function for backwards compatibility.
2044          * @see WikiPage::doPurge
2045          */
2046         public function doPurge( $flags = WikiPage::PURGE_ALL ) {
2047                 return $this->mPage->doPurge( $flags );
2048         }
2049
2050         /**
2051          * Call to WikiPage function for backwards compatibility.
2052          * @see WikiPage::getLastPurgeTimestamp
2053          */
2054         public function getLastPurgeTimestamp() {
2055                 return $this->mPage->getLastPurgeTimestamp();
2056         }
2057
2058         /**
2059          * Call to WikiPage function for backwards compatibility.
2060          * @see WikiPage::doViewUpdates
2061          */
2062         public function doViewUpdates( User $user, $oldid = 0 ) {
2063                 $this->mPage->doViewUpdates( $user, $oldid );
2064         }
2065
2066         /**
2067          * Call to WikiPage function for backwards compatibility.
2068          * @see WikiPage::exists
2069          */
2070         public function exists() {
2071                 return $this->mPage->exists();
2072         }
2073
2074         /**
2075          * Call to WikiPage function for backwards compatibility.
2076          * @see WikiPage::followRedirect
2077          */
2078         public function followRedirect() {
2079                 return $this->mPage->followRedirect();
2080         }
2081
2082         /**
2083          * Call to WikiPage function for backwards compatibility.
2084          * @see ContentHandler::getActionOverrides
2085          */
2086         public function getActionOverrides() {
2087                 return $this->mPage->getActionOverrides();
2088         }
2089
2090         /**
2091          * Call to WikiPage function for backwards compatibility.
2092          * @see WikiPage::getAutoDeleteReason
2093          */
2094         public function getAutoDeleteReason( &$hasHistory ) {
2095                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2096         }
2097
2098         /**
2099          * Call to WikiPage function for backwards compatibility.
2100          * @see WikiPage::getCategories
2101          */
2102         public function getCategories() {
2103                 return $this->mPage->getCategories();
2104         }
2105
2106         /**
2107          * Call to WikiPage function for backwards compatibility.
2108          * @see WikiPage::getComment
2109          */
2110         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2111                 return $this->mPage->getComment( $audience, $user );
2112         }
2113
2114         /**
2115          * Call to WikiPage function for backwards compatibility.
2116          * @see WikiPage::getContentHandler
2117          */
2118         public function getContentHandler() {
2119                 return $this->mPage->getContentHandler();
2120         }
2121
2122         /**
2123          * Call to WikiPage function for backwards compatibility.
2124          * @see WikiPage::getContentModel
2125          */
2126         public function getContentModel() {
2127                 return $this->mPage->getContentModel();
2128         }
2129
2130         /**
2131          * Call to WikiPage function for backwards compatibility.
2132          * @see WikiPage::getContributors
2133          */
2134         public function getContributors() {
2135                 return $this->mPage->getContributors();
2136         }
2137
2138         /**
2139          * Call to WikiPage function for backwards compatibility.
2140          * @see WikiPage::getCreator
2141          */
2142         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2143                 return $this->mPage->getCreator( $audience, $user );
2144         }
2145
2146         /**
2147          * Call to WikiPage function for backwards compatibility.
2148          * @see WikiPage::getDeletionUpdates
2149          */
2150         public function getDeletionUpdates( Content $content = null ) {
2151                 return $this->mPage->getDeletionUpdates( $content );
2152         }
2153
2154         /**
2155          * Call to WikiPage function for backwards compatibility.
2156          * @see WikiPage::getHiddenCategories
2157          */
2158         public function getHiddenCategories() {
2159                 return $this->mPage->getHiddenCategories();
2160         }
2161
2162         /**
2163          * Call to WikiPage function for backwards compatibility.
2164          * @see WikiPage::getId
2165          */
2166         public function getId() {
2167                 return $this->mPage->getId();
2168         }
2169
2170         /**
2171          * Call to WikiPage function for backwards compatibility.
2172          * @see WikiPage::getLatest
2173          */
2174         public function getLatest() {
2175                 return $this->mPage->getLatest();
2176         }
2177
2178         /**
2179          * Call to WikiPage function for backwards compatibility.
2180          * @see WikiPage::getLinksTimestamp
2181          */
2182         public function getLinksTimestamp() {
2183                 return $this->mPage->getLinksTimestamp();
2184         }
2185
2186         /**
2187          * Call to WikiPage function for backwards compatibility.
2188          * @see WikiPage::getMinorEdit
2189          */
2190         public function getMinorEdit() {
2191                 return $this->mPage->getMinorEdit();
2192         }
2193
2194         /**
2195          * Call to WikiPage function for backwards compatibility.
2196          * @see WikiPage::getOldestRevision
2197          */
2198         public function getOldestRevision() {
2199                 return $this->mPage->getOldestRevision();
2200         }
2201
2202         /**
2203          * Call to WikiPage function for backwards compatibility.
2204          * @see WikiPage::getRedirectTarget
2205          */
2206         public function getRedirectTarget() {
2207                 return $this->mPage->getRedirectTarget();
2208         }
2209
2210         /**
2211          * Call to WikiPage function for backwards compatibility.
2212          * @see WikiPage::getRedirectURL
2213          */
2214         public function getRedirectURL( $rt ) {
2215                 return $this->mPage->getRedirectURL( $rt );
2216         }
2217
2218         /**
2219          * Call to WikiPage function for backwards compatibility.
2220          * @see WikiPage::getRevision
2221          */
2222         public function getRevision() {
2223                 return $this->mPage->getRevision();
2224         }
2225
2226         /**
2227          * Call to WikiPage function for backwards compatibility.
2228          * @see WikiPage::getTimestamp
2229          */
2230         public function getTimestamp() {
2231                 return $this->mPage->getTimestamp();
2232         }
2233
2234         /**
2235          * Call to WikiPage function for backwards compatibility.
2236          * @see WikiPage::getTouched
2237          */
2238         public function getTouched() {
2239                 return $this->mPage->getTouched();
2240         }
2241
2242         /**
2243          * Call to WikiPage function for backwards compatibility.
2244          * @see WikiPage::getUndoContent
2245          */
2246         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2247                 return $this->mPage->getUndoContent( $undo, $undoafter );
2248         }
2249
2250         /**
2251          * Call to WikiPage function for backwards compatibility.
2252          * @see WikiPage::getUser
2253          */
2254         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2255                 return $this->mPage->getUser( $audience, $user );
2256         }
2257
2258         /**
2259          * Call to WikiPage function for backwards compatibility.
2260          * @see WikiPage::getUserText
2261          */
2262         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2263                 return $this->mPage->getUserText( $audience, $user );
2264         }
2265
2266         /**
2267          * Call to WikiPage function for backwards compatibility.
2268          * @see WikiPage::hasViewableContent
2269          */
2270         public function hasViewableContent() {
2271                 return $this->mPage->hasViewableContent();
2272         }
2273
2274         /**
2275          * Call to WikiPage function for backwards compatibility.
2276          * @see WikiPage::insertOn
2277          */
2278         public function insertOn( $dbw, $pageId = null ) {
2279                 return $this->mPage->insertOn( $dbw, $pageId );
2280         }
2281
2282         /**
2283          * Call to WikiPage function for backwards compatibility.
2284          * @see WikiPage::insertProtectNullRevision
2285          */
2286         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2287                 array $expiry, $cascade, $reason, $user = null
2288         ) {
2289                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2290                         $expiry, $cascade, $reason, $user
2291                 );
2292         }
2293
2294         /**
2295          * Call to WikiPage function for backwards compatibility.
2296          * @see WikiPage::insertRedirect
2297          */
2298         public function insertRedirect() {
2299                 return $this->mPage->insertRedirect();
2300         }
2301
2302         /**
2303          * Call to WikiPage function for backwards compatibility.
2304          * @see WikiPage::insertRedirectEntry
2305          */
2306         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2307                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2308         }
2309
2310         /**
2311          * Call to WikiPage function for backwards compatibility.
2312          * @see WikiPage::isCountable
2313          */
2314         public function isCountable( $editInfo = false ) {
2315                 return $this->mPage->isCountable( $editInfo );
2316         }
2317
2318         /**
2319          * Call to WikiPage function for backwards compatibility.
2320          * @see WikiPage::isRedirect
2321          */
2322         public function isRedirect() {
2323                 return $this->mPage->isRedirect();
2324         }
2325
2326         /**
2327          * Call to WikiPage function for backwards compatibility.
2328          * @see WikiPage::loadFromRow
2329          */
2330         public function loadFromRow( $data, $from ) {
2331                 return $this->mPage->loadFromRow( $data, $from );
2332         }
2333
2334         /**
2335          * Call to WikiPage function for backwards compatibility.
2336          * @see WikiPage::loadPageData
2337          */
2338         public function loadPageData( $from = 'fromdb' ) {
2339                 $this->mPage->loadPageData( $from );
2340         }
2341
2342         /**
2343          * Call to WikiPage function for backwards compatibility.
2344          * @see WikiPage::lockAndGetLatest
2345          */
2346         public function lockAndGetLatest() {
2347                 return $this->mPage->lockAndGetLatest();
2348         }
2349
2350         /**
2351          * Call to WikiPage function for backwards compatibility.
2352          * @see WikiPage::makeParserOptions
2353          */
2354         public function makeParserOptions( $context ) {
2355                 return $this->mPage->makeParserOptions( $context );
2356         }
2357
2358         /**
2359          * Call to WikiPage function for backwards compatibility.
2360          * @see WikiPage::pageDataFromId
2361          */
2362         public function pageDataFromId( $dbr, $id, $options = [] ) {
2363                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2364         }
2365
2366         /**
2367          * Call to WikiPage function for backwards compatibility.
2368          * @see WikiPage::pageDataFromTitle
2369          */
2370         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2371                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2372         }
2373
2374         /**
2375          * Call to WikiPage function for backwards compatibility.
2376          * @see WikiPage::prepareContentForEdit
2377          */
2378         public function prepareContentForEdit(
2379                 Content $content, $revision = null, User $user = null,
2380                 $serialFormat = null, $useCache = true
2381         ) {
2382                 return $this->mPage->prepareContentForEdit(
2383                         $content, $revision, $user,
2384                         $serialFormat, $useCache
2385                 );
2386         }
2387
2388         /**
2389          * Call to WikiPage function for backwards compatibility.
2390          * @see WikiPage::protectDescription
2391          */
2392         public function protectDescription( array $limit, array $expiry ) {
2393                 return $this->mPage->protectDescription( $limit, $expiry );
2394         }
2395
2396         /**
2397          * Call to WikiPage function for backwards compatibility.
2398          * @see WikiPage::protectDescriptionLog
2399          */
2400         public function protectDescriptionLog( array $limit, array $expiry ) {
2401                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2402         }
2403
2404         /**
2405          * Call to WikiPage function for backwards compatibility.
2406          * @see WikiPage::replaceSectionAtRev
2407          */
2408         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2409                 $sectionTitle = '', $baseRevId = null
2410         ) {
2411                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2412                         $sectionTitle, $baseRevId
2413                 );
2414         }
2415
2416         /**
2417          * Call to WikiPage function for backwards compatibility.
2418          * @see WikiPage::replaceSectionContent
2419          */
2420         public function replaceSectionContent(
2421                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2422         ) {
2423                 return $this->mPage->replaceSectionContent(
2424                         $sectionId, $sectionContent, $sectionTitle, $edittime
2425                 );
2426         }
2427
2428         /**
2429          * Call to WikiPage function for backwards compatibility.
2430          * @see WikiPage::setTimestamp
2431          */
2432         public function setTimestamp( $ts ) {
2433                 return $this->mPage->setTimestamp( $ts );
2434         }
2435
2436         /**
2437          * Call to WikiPage function for backwards compatibility.
2438          * @see WikiPage::shouldCheckParserCache
2439          */
2440         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2441                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2442         }
2443
2444         /**
2445          * Call to WikiPage function for backwards compatibility.
2446          * @see WikiPage::supportsSections
2447          */
2448         public function supportsSections() {
2449                 return $this->mPage->supportsSections();
2450         }
2451
2452         /**
2453          * Call to WikiPage function for backwards compatibility.
2454          * @see WikiPage::triggerOpportunisticLinksUpdate
2455          */
2456         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2457                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2458         }
2459
2460         /**
2461          * Call to WikiPage function for backwards compatibility.
2462          * @see WikiPage::updateCategoryCounts
2463          */
2464         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2465                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2466         }
2467
2468         /**
2469          * Call to WikiPage function for backwards compatibility.
2470          * @see WikiPage::updateIfNewerOn
2471          */
2472         public function updateIfNewerOn( $dbw, $revision ) {
2473                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2474         }
2475
2476         /**
2477          * Call to WikiPage function for backwards compatibility.
2478          * @see WikiPage::updateRedirectOn
2479          */
2480         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2481                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null );
2482         }
2483
2484         /**
2485          * Call to WikiPage function for backwards compatibility.
2486          * @see WikiPage::updateRevisionOn
2487          */
2488         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2489                 $lastRevIsRedirect = null
2490         ) {
2491                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2492                         $lastRevIsRedirect
2493                 );
2494         }
2495
2496         /**
2497          * @param array $limit
2498          * @param array $expiry
2499          * @param bool $cascade
2500          * @param string $reason
2501          * @param User $user
2502          * @return Status
2503          */
2504         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2505                 $reason, User $user
2506         ) {
2507                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2508         }
2509
2510         /**
2511          * @param array $limit
2512          * @param string $reason
2513          * @param int $cascade
2514          * @param array $expiry
2515          * @return bool
2516          */
2517         public function updateRestrictions( $limit = [], $reason = '',
2518                 &$cascade = 0, $expiry = []
2519         ) {
2520                 return $this->mPage->doUpdateRestrictions(
2521                         $limit,
2522                         $expiry,
2523                         $cascade,
2524                         $reason,
2525                         $this->getContext()->getUser()
2526                 );
2527         }
2528
2529         /**
2530          * @param string $reason
2531          * @param bool $suppress
2532          * @param int $u1 Unused
2533          * @param bool $u2 Unused
2534          * @param string $error
2535          * @return bool
2536          */
2537         public function doDeleteArticle(
2538                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = ''
2539         ) {
2540                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error );
2541         }
2542
2543         /**
2544          * @param string $fromP
2545          * @param string $summary
2546          * @param string $token
2547          * @param bool $bot
2548          * @param array $resultDetails
2549          * @param User|null $user
2550          * @return array
2551          */
2552         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2553                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2554                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2555         }
2556
2557         /**
2558          * @param string $fromP
2559          * @param string $summary
2560          * @param bool $bot
2561          * @param array $resultDetails
2562          * @param User|null $guser
2563          * @return array
2564          */
2565         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2566                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2567                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2568         }
2569
2570         /**
2571          * @param bool $hasHistory
2572          * @return mixed
2573          */
2574         public function generateReason( &$hasHistory ) {
2575                 $title = $this->mPage->getTitle();
2576                 $handler = ContentHandler::getForTitle( $title );
2577                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2578         }
2579
2580         /**
2581          * @return array
2582          *
2583          * @deprecated since 1.24, use WikiPage::selectFields() instead
2584          */
2585         public static function selectFields() {
2586                 wfDeprecated( __METHOD__, '1.24' );
2587                 return WikiPage::selectFields();
2588         }
2589
2590         /**
2591          * @param Title $title
2592          *
2593          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2594          */
2595         public static function onArticleCreate( $title ) {
2596                 wfDeprecated( __METHOD__, '1.24' );
2597                 WikiPage::onArticleCreate( $title );
2598         }
2599
2600         /**
2601          * @param Title $title
2602          *
2603          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2604          */
2605         public static function onArticleDelete( $title ) {
2606                 wfDeprecated( __METHOD__, '1.24' );
2607                 WikiPage::onArticleDelete( $title );
2608         }
2609
2610         /**
2611          * @param Title $title
2612          *
2613          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2614          */
2615         public static function onArticleEdit( $title ) {
2616                 wfDeprecated( __METHOD__, '1.24' );
2617                 WikiPage::onArticleEdit( $title );
2618         }
2619
2620         // ******
2621 }