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 (bug 11443)
 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                         # (bug 14900) 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                         $conds = [ "log_action != 'revision'" ];
1175                         // Give extensions a chance to hide their (unrelated) log entries
1176                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1177                         LogEventsList::showLogExtract(
1178                                 $outputPage,
1179                                 $logTypes,
1180                                 $title,
1181                                 '',
1182                                 [
1183                                         'lim' => 10,
1184                                         'conds' => $conds,
1185                                         'showIfEmpty' => false,
1186                                         'msgKey' => [ $loggedIn
1187                                                 ? 'moveddeleted-notice'
1188                                                 : 'moveddeleted-notice-recent'
1189                                         ]
1190                                 ]
1191                         );
1192                 }
1193
1194                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1195                         // If there's no backing content, send a 404 Not Found
1196                         // for better machine handling of broken links.
1197                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1198                 }
1199
1200                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1201                 $policy = $this->getRobotPolicy( 'view' );
1202                 $outputPage->setIndexPolicy( $policy['index'] );
1203                 $outputPage->setFollowPolicy( $policy['follow'] );
1204
1205                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1206
1207                 if ( !$hookResult ) {
1208                         return;
1209                 }
1210
1211                 # Show error message
1212                 $oldid = $this->getOldID();
1213                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1214                         $outputPage->addParserOutput( $this->getContentObject()->getParserOutput( $title ) );
1215                 } else {
1216                         if ( $oldid ) {
1217                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1218                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1219                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1220                         ) {
1221                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1222                                 $text = wfMessage( $message )->plain();
1223                         } else {
1224                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1225                         }
1226
1227                         $dir = $this->getContext()->getLanguage()->getDir();
1228                         $lang = $this->getContext()->getLanguage()->getCode();
1229                         $outputPage->addWikiText( Xml::openElement( 'div', [
1230                                 'class' => "noarticletext mw-content-$dir",
1231                                 'dir' => $dir,
1232                                 'lang' => $lang,
1233                         ] ) . "\n$text\n</div>" );
1234                 }
1235         }
1236
1237         /**
1238          * If the revision requested for view is deleted, check permissions.
1239          * Send either an error message or a warning header to the output.
1240          *
1241          * @return bool True if the view is allowed, false if not.
1242          */
1243         public function showDeletedRevisionHeader() {
1244                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1245                         // Not deleted
1246                         return true;
1247                 }
1248
1249                 $outputPage = $this->getContext()->getOutput();
1250                 $user = $this->getContext()->getUser();
1251                 // If the user is not allowed to see it...
1252                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1253                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1254                                 'rev-deleted-text-permission' );
1255
1256                         return false;
1257                 // If the user needs to confirm that they want to see it...
1258                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1259                         # Give explanation and add a link to view the revision...
1260                         $oldid = intval( $this->getOldID() );
1261                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1262                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1263                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1264                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1265                                 [ $msg, $link ] );
1266
1267                         return false;
1268                 // We are allowed to see...
1269                 } else {
1270                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1271                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1272                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1273
1274                         return true;
1275                 }
1276         }
1277
1278         /**
1279          * Generate the navigation links when browsing through an article revisions
1280          * It shows the information as:
1281          *   Revision as of \<date\>; view current revision
1282          *   \<- Previous version | Next Version -\>
1283          *
1284          * @param int $oldid Revision ID of this article revision
1285          */
1286         public function setOldSubtitle( $oldid = 0 ) {
1287                 // Avoid PHP 7.1 warning of passing $this by reference
1288                 $articlePage = $this;
1289
1290                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1291                         return;
1292                 }
1293
1294                 $context = $this->getContext();
1295                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1296
1297                 # Cascade unhide param in links for easy deletion browsing
1298                 $extraParams = [];
1299                 if ( $unhide ) {
1300                         $extraParams['unhide'] = 1;
1301                 }
1302
1303                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1304                         $revision = $this->mRevision;
1305                 } else {
1306                         $revision = Revision::newFromId( $oldid );
1307                 }
1308
1309                 $timestamp = $revision->getTimestamp();
1310
1311                 $current = ( $oldid == $this->mPage->getLatest() );
1312                 $language = $context->getLanguage();
1313                 $user = $context->getUser();
1314
1315                 $td = $language->userTimeAndDate( $timestamp, $user );
1316                 $tddate = $language->userDate( $timestamp, $user );
1317                 $tdtime = $language->userTime( $timestamp, $user );
1318
1319                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1320                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1321
1322                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1323                         ? 'revision-info-current'
1324                         : 'revision-info';
1325
1326                 $outputPage = $context->getOutput();
1327                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1328                         $context->msg( $infomsg, $td )
1329                                 ->rawParams( $userlinks )
1330                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1331                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1332                                 ->parse() .
1333                         "</div>";
1334
1335                 $lnk = $current
1336                         ? $context->msg( 'currentrevisionlink' )->escaped()
1337                         : Linker::linkKnown(
1338                                 $this->getTitle(),
1339                                 $context->msg( 'currentrevisionlink' )->escaped(),
1340                                 [],
1341                                 $extraParams
1342                         );
1343                 $curdiff = $current
1344                         ? $context->msg( 'diff' )->escaped()
1345                         : Linker::linkKnown(
1346                                 $this->getTitle(),
1347                                 $context->msg( 'diff' )->escaped(),
1348                                 [],
1349                                 [
1350                                         'diff' => 'cur',
1351                                         'oldid' => $oldid
1352                                 ] + $extraParams
1353                         );
1354                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1355                 $prevlink = $prev
1356                         ? Linker::linkKnown(
1357                                 $this->getTitle(),
1358                                 $context->msg( 'previousrevision' )->escaped(),
1359                                 [],
1360                                 [
1361                                         'direction' => 'prev',
1362                                         'oldid' => $oldid
1363                                 ] + $extraParams
1364                         )
1365                         : $context->msg( 'previousrevision' )->escaped();
1366                 $prevdiff = $prev
1367                         ? Linker::linkKnown(
1368                                 $this->getTitle(),
1369                                 $context->msg( 'diff' )->escaped(),
1370                                 [],
1371                                 [
1372                                         'diff' => 'prev',
1373                                         'oldid' => $oldid
1374                                 ] + $extraParams
1375                         )
1376                         : $context->msg( 'diff' )->escaped();
1377                 $nextlink = $current
1378                         ? $context->msg( 'nextrevision' )->escaped()
1379                         : Linker::linkKnown(
1380                                 $this->getTitle(),
1381                                 $context->msg( 'nextrevision' )->escaped(),
1382                                 [],
1383                                 [
1384                                         'direction' => 'next',
1385                                         'oldid' => $oldid
1386                                 ] + $extraParams
1387                         );
1388                 $nextdiff = $current
1389                         ? $context->msg( 'diff' )->escaped()
1390                         : Linker::linkKnown(
1391                                 $this->getTitle(),
1392                                 $context->msg( 'diff' )->escaped(),
1393                                 [],
1394                                 [
1395                                         'diff' => 'next',
1396                                         'oldid' => $oldid
1397                                 ] + $extraParams
1398                         );
1399
1400                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1401                 if ( $cdel !== '' ) {
1402                         $cdel .= ' ';
1403                 }
1404
1405                 // the outer div is need for styling the revision info and nav in MobileFrontend
1406                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1407                         "<div id=\"mw-revision-nav\">" . $cdel .
1408                         $context->msg( 'revision-nav' )->rawParams(
1409                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1410                         )->escaped() . "</div></div>" );
1411         }
1412
1413         /**
1414          * Return the HTML for the top of a redirect page
1415          *
1416          * Chances are you should just be using the ParserOutput from
1417          * WikitextContent::getParserOutput instead of calling this for redirects.
1418          *
1419          * @param Title|array $target Destination(s) to redirect
1420          * @param bool $appendSubtitle [optional]
1421          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1422          * @return string Containing HTML with redirect link
1423          */
1424         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1425                 $lang = $this->getTitle()->getPageLanguage();
1426                 $out = $this->getContext()->getOutput();
1427                 if ( $appendSubtitle ) {
1428                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1429                 }
1430                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1431                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1432         }
1433
1434         /**
1435          * Return the HTML for the top of a redirect page
1436          *
1437          * Chances are you should just be using the ParserOutput from
1438          * WikitextContent::getParserOutput instead of calling this for redirects.
1439          *
1440          * @since 1.23
1441          * @param Language $lang
1442          * @param Title|array $target Destination(s) to redirect
1443          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1444          * @return string Containing HTML with redirect link
1445          */
1446         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1447                 if ( !is_array( $target ) ) {
1448                         $target = [ $target ];
1449                 }
1450
1451                 $html = '<ul class="redirectText">';
1452                 /** @var Title $title */
1453                 foreach ( $target as $title ) {
1454                         $html .= '<li>' . Linker::link(
1455                                 $title,
1456                                 htmlspecialchars( $title->getFullText() ),
1457                                 [],
1458                                 // Make sure wiki page redirects are not followed
1459                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1460                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1461                         ) . '</li>';
1462                 }
1463                 $html .= '</ul>';
1464
1465                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1466
1467                 return '<div class="redirectMsg">' .
1468                         '<p>' . $redirectToText . '</p>' .
1469                         $html .
1470                         '</div>';
1471         }
1472
1473         /**
1474          * Adds help link with an icon via page indicators.
1475          * Link target can be overridden by a local message containing a wikilink:
1476          * the message key is: 'namespace-' + namespace number + '-helppage'.
1477          * @param string $to Target MediaWiki.org page title or encoded URL.
1478          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1479          * @since 1.25
1480          */
1481         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1482                 $msg = wfMessage(
1483                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1484                 );
1485
1486                 $out = $this->getContext()->getOutput();
1487                 if ( !$msg->isDisabled() ) {
1488                         $helpUrl = Skin::makeUrl( $msg->plain() );
1489                         $out->addHelpLink( $helpUrl, true );
1490                 } else {
1491                         $out->addHelpLink( $to, $overrideBaseUrl );
1492                 }
1493         }
1494
1495         /**
1496          * Handle action=render
1497          */
1498         public function render() {
1499                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1500                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1501                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1502                 $this->view();
1503         }
1504
1505         /**
1506          * action=protect handler
1507          */
1508         public function protect() {
1509                 $form = new ProtectionForm( $this );
1510                 $form->execute();
1511         }
1512
1513         /**
1514          * action=unprotect handler (alias)
1515          */
1516         public function unprotect() {
1517                 $this->protect();
1518         }
1519
1520         /**
1521          * UI entry point for page deletion
1522          */
1523         public function delete() {
1524                 # This code desperately needs to be totally rewritten
1525
1526                 $title = $this->getTitle();
1527                 $context = $this->getContext();
1528                 $user = $context->getUser();
1529                 $request = $context->getRequest();
1530
1531                 # Check permissions
1532                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1533                 if ( count( $permissionErrors ) ) {
1534                         throw new PermissionsError( 'delete', $permissionErrors );
1535                 }
1536
1537                 # Read-only check...
1538                 if ( wfReadOnly() ) {
1539                         throw new ReadOnlyError;
1540                 }
1541
1542                 # Better double-check that it hasn't been deleted yet!
1543                 $this->mPage->loadPageData(
1544                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1545                 );
1546                 if ( !$this->mPage->exists() ) {
1547                         $deleteLogPage = new LogPage( 'delete' );
1548                         $outputPage = $context->getOutput();
1549                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1550                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1551                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1552                                 );
1553                         $outputPage->addHTML(
1554                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1555                         );
1556                         LogEventsList::showLogExtract(
1557                                 $outputPage,
1558                                 'delete',
1559                                 $title
1560                         );
1561
1562                         return;
1563                 }
1564
1565                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1566                 $deleteReason = $request->getText( 'wpReason' );
1567
1568                 if ( $deleteReasonList == 'other' ) {
1569                         $reason = $deleteReason;
1570                 } elseif ( $deleteReason != '' ) {
1571                         // Entry from drop down menu + additional comment
1572                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1573                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1574                 } else {
1575                         $reason = $deleteReasonList;
1576                 }
1577
1578                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1579                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1580                 ) {
1581                         # Flag to hide all contents of the archived revisions
1582                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1583
1584                         $this->doDelete( $reason, $suppress );
1585
1586                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1587
1588                         return;
1589                 }
1590
1591                 // Generate deletion reason
1592                 $hasHistory = false;
1593                 if ( !$reason ) {
1594                         try {
1595                                 $reason = $this->generateReason( $hasHistory );
1596                         } catch ( Exception $e ) {
1597                                 # if a page is horribly broken, we still want to be able to
1598                                 # delete it. So be lenient about errors here.
1599                                 wfDebug( "Error while building auto delete summary: $e" );
1600                                 $reason = '';
1601                         }
1602                 }
1603
1604                 // If the page has a history, insert a warning
1605                 if ( $hasHistory ) {
1606                         $title = $this->getTitle();
1607
1608                         // The following can use the real revision count as this is only being shown for users
1609                         // that can delete this page.
1610                         // This, as a side-effect, also makes sure that the following query isn't being run for
1611                         // pages with a larger history, unless the user has the 'bigdelete' right
1612                         // (and is about to delete this page).
1613                         $dbr = wfGetDB( DB_REPLICA );
1614                         $revisions = $edits = (int)$dbr->selectField(
1615                                 'revision',
1616                                 'COUNT(rev_page)',
1617                                 [ 'rev_page' => $title->getArticleID() ],
1618                                 __METHOD__
1619                         );
1620
1621                         // @todo FIXME: i18n issue/patchwork message
1622                         $context->getOutput()->addHTML(
1623                                 '<strong class="mw-delete-warning-revisions">' .
1624                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1625                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1626                                         $context->msg( 'history' )->escaped(),
1627                                         [],
1628                                         [ 'action' => 'history' ] ) .
1629                                 '</strong>'
1630                         );
1631
1632                         if ( $title->isBigDeletion() ) {
1633                                 global $wgDeleteRevisionsLimit;
1634                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1635                                         [
1636                                                 'delete-warning-toobig',
1637                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1638                                         ]
1639                                 );
1640                         }
1641                 }
1642
1643                 $this->confirmDelete( $reason );
1644         }
1645
1646         /**
1647          * Output deletion confirmation dialog
1648          * @todo FIXME: Move to another file?
1649          * @param string $reason Prefilled reason
1650          */
1651         public function confirmDelete( $reason ) {
1652                 wfDebug( "Article::confirmDelete\n" );
1653
1654                 $title = $this->getTitle();
1655                 $ctx = $this->getContext();
1656                 $outputPage = $ctx->getOutput();
1657                 if ( !wfMessage( 'deletereason-dropdown' )->inContentLanguage()->isDisabled() ) {
1658                         $reasonsList = Xml::getArrayFromWikiTextList(
1659                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text()
1660                         );
1661                         $outputPage->addModules( 'mediawiki.reasonSuggest' );
1662                         $outputPage->addJsConfigVars( [
1663                                 'reasons' => $reasonsList
1664                         ] );
1665                 }
1666                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1667                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1668                 $outputPage->addBacklinkSubtitle( $title );
1669                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1670                 $backlinkCache = $title->getBacklinkCache();
1671                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1672                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1673                                 'deleting-backlinks-warning' );
1674                 }
1675                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1676
1677                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1678
1679                 $user = $this->getContext()->getUser();
1680                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1681                         $suppress = Html::openElement( 'div', [ 'id' => 'wpDeleteSuppressRow' ] ) .
1682                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1683                                         'wpSuppress', 'wpSuppress', false, [ 'tabindex' => '4' ] ) .
1684                                 Html::closeElement( 'div' );
1685                 } else {
1686                         $suppress = '';
1687                 }
1688                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1689                 $form = Html::openElement( 'form', [ 'method' => 'post',
1690                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ] ) .
1691                         Html::openElement( 'fieldset', [ 'id' => 'mw-delete-table' ] ) .
1692                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1693                         Html::openElement( 'div', [ 'id' => 'mw-deleteconfirm-table' ] ) .
1694                         Html::openElement( 'div', [ 'id' => 'wpDeleteReasonListRow' ] ) .
1695                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1696                         '&nbsp;' .
1697                         Xml::listDropDown(
1698                                 'wpDeleteReasonList',
1699                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1700                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1701                                 '',
1702                                 'wpReasonDropDown',
1703                                 1
1704                         ) .
1705                         Html::closeElement( 'div' ) .
1706                         Html::openElement( 'div', [ 'id' => 'wpDeleteReasonRow' ] ) .
1707                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1708                         '&nbsp;' .
1709                         Html::input( 'wpReason', $reason, 'text', [
1710                                 'size' => '60',
1711                                 'maxlength' => '255',
1712                                 'tabindex' => '2',
1713                                 'id' => 'wpReason',
1714                                 'class' => 'mw-ui-input-inline',
1715                                 'autofocus'
1716                         ] ) .
1717                         Html::closeElement( 'div' );
1718
1719                 # Disallow watching if user is not logged in
1720                 if ( $user->isLoggedIn() ) {
1721                         $form .=
1722                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1723                                                 'wpWatch', 'wpWatch', $checkWatch, [ 'tabindex' => '3' ] );
1724                 }
1725
1726                 $form .=
1727                                 Html::openElement( 'div' ) .
1728                                 $suppress .
1729                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1730                                                 [
1731                                                         'name' => 'wpConfirmB',
1732                                                         'id' => 'wpConfirmB',
1733                                                         'tabindex' => '5',
1734                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1735                                                 ]
1736                                         ) .
1737                                 Html::closeElement( 'div' ) .
1738                         Html::closeElement( 'div' ) .
1739                         Xml::closeElement( 'fieldset' ) .
1740                         Html::hidden(
1741                                 'wpEditToken',
1742                                 $user->getEditToken( [ 'delete', $title->getPrefixedText() ] )
1743                         ) .
1744                         Xml::closeElement( 'form' );
1745
1746                         if ( $user->isAllowed( 'editinterface' ) ) {
1747                                 $link = Linker::linkKnown(
1748                                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
1749                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1750                                         [],
1751                                         [ 'action' => 'edit' ]
1752                                 );
1753                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1754                         }
1755
1756                 $outputPage->addHTML( $form );
1757
1758                 $deleteLogPage = new LogPage( 'delete' );
1759                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1760                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1761         }
1762
1763         /**
1764          * Perform a deletion and output success or failure messages
1765          * @param string $reason
1766          * @param bool $suppress
1767          */
1768         public function doDelete( $reason, $suppress = false ) {
1769                 $error = '';
1770                 $context = $this->getContext();
1771                 $outputPage = $context->getOutput();
1772                 $user = $context->getUser();
1773                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user );
1774
1775                 if ( $status->isGood() ) {
1776                         $deleted = $this->getTitle()->getPrefixedText();
1777
1778                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1779                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1780
1781                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1782
1783                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1784
1785                         Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
1786
1787                         $outputPage->returnToMain( false );
1788                 } else {
1789                         $outputPage->setPageTitle(
1790                                 wfMessage( 'cannotdelete-title',
1791                                         $this->getTitle()->getPrefixedText() )
1792                         );
1793
1794                         if ( $error == '' ) {
1795                                 $outputPage->addWikiText(
1796                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1797                                 );
1798                                 $deleteLogPage = new LogPage( 'delete' );
1799                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1800
1801                                 LogEventsList::showLogExtract(
1802                                         $outputPage,
1803                                         'delete',
1804                                         $this->getTitle()
1805                                 );
1806                         } else {
1807                                 $outputPage->addHTML( $error );
1808                         }
1809                 }
1810         }
1811
1812         /* Caching functions */
1813
1814         /**
1815          * checkLastModified returns true if it has taken care of all
1816          * output to the client that is necessary for this request.
1817          * (that is, it has sent a cached version of the page)
1818          *
1819          * @return bool True if cached version send, false otherwise
1820          */
1821         protected function tryFileCache() {
1822                 static $called = false;
1823
1824                 if ( $called ) {
1825                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1826                         return false;
1827                 }
1828
1829                 $called = true;
1830                 if ( $this->isFileCacheable() ) {
1831                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1832                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1833                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1834                                 $cache->loadFromFileCache( $this->getContext() );
1835                                 return true;
1836                         } else {
1837                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1838                                 ob_start( [ &$cache, 'saveToFileCache' ] );
1839                         }
1840                 } else {
1841                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1842                 }
1843
1844                 return false;
1845         }
1846
1847         /**
1848          * Check if the page can be cached
1849          * @param integer $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
1850          * @return bool
1851          */
1852         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
1853                 $cacheable = false;
1854
1855                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
1856                         $cacheable = $this->mPage->getId()
1857                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1858                         // Extension may have reason to disable file caching on some pages.
1859                         if ( $cacheable ) {
1860                                 // Avoid PHP 7.1 warning of passing $this by reference
1861                                 $articlePage = $this;
1862                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
1863                         }
1864                 }
1865
1866                 return $cacheable;
1867         }
1868
1869         /**#@-*/
1870
1871         /**
1872          * Lightweight method to get the parser output for a page, checking the parser cache
1873          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1874          * consider, so it's not appropriate to use there.
1875          *
1876          * @since 1.16 (r52326) for LiquidThreads
1877          *
1878          * @param int|null $oldid Revision ID or null
1879          * @param User $user The relevant user
1880          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1881          */
1882         public function getParserOutput( $oldid = null, User $user = null ) {
1883                 // XXX: bypasses mParserOptions and thus setParserOptions()
1884
1885                 if ( $user === null ) {
1886                         $parserOptions = $this->getParserOptions();
1887                 } else {
1888                         $parserOptions = $this->mPage->makeParserOptions( $user );
1889                 }
1890
1891                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1892         }
1893
1894         /**
1895          * Override the ParserOptions used to render the primary article wikitext.
1896          *
1897          * @param ParserOptions $options
1898          * @throws MWException If the parser options where already initialized.
1899          */
1900         public function setParserOptions( ParserOptions $options ) {
1901                 if ( $this->mParserOptions ) {
1902                         throw new MWException( "can't change parser options after they have already been set" );
1903                 }
1904
1905                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1906                 $this->mParserOptions = clone $options;
1907         }
1908
1909         /**
1910          * Get parser options suitable for rendering the primary article wikitext
1911          * @return ParserOptions
1912          */
1913         public function getParserOptions() {
1914                 if ( !$this->mParserOptions ) {
1915                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1916                 }
1917                 // Clone to allow modifications of the return value without affecting cache
1918                 return clone $this->mParserOptions;
1919         }
1920
1921         /**
1922          * Sets the context this Article is executed in
1923          *
1924          * @param IContextSource $context
1925          * @since 1.18
1926          */
1927         public function setContext( $context ) {
1928                 $this->mContext = $context;
1929         }
1930
1931         /**
1932          * Gets the context this Article is executed in
1933          *
1934          * @return IContextSource
1935          * @since 1.18
1936          */
1937         public function getContext() {
1938                 if ( $this->mContext instanceof IContextSource ) {
1939                         return $this->mContext;
1940                 } else {
1941                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1942                                 "Return RequestContext::getMain(); for sanity\n" );
1943                         return RequestContext::getMain();
1944                 }
1945         }
1946
1947         /**
1948          * Use PHP's magic __get handler to handle accessing of
1949          * raw WikiPage fields for backwards compatibility.
1950          *
1951          * @param string $fname Field name
1952          * @return mixed
1953          */
1954         public function __get( $fname ) {
1955                 if ( property_exists( $this->mPage, $fname ) ) {
1956                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
1957                         return $this->mPage->$fname;
1958                 }
1959                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1960         }
1961
1962         /**
1963          * Use PHP's magic __set handler to handle setting of
1964          * raw WikiPage fields for backwards compatibility.
1965          *
1966          * @param string $fname Field name
1967          * @param mixed $fvalue New value
1968          */
1969         public function __set( $fname, $fvalue ) {
1970                 if ( property_exists( $this->mPage, $fname ) ) {
1971                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
1972                         $this->mPage->$fname = $fvalue;
1973                 // Note: extensions may want to toss on new fields
1974                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
1975                         $this->mPage->$fname = $fvalue;
1976                 } else {
1977                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1978                 }
1979         }
1980
1981         /**
1982          * Call to WikiPage function for backwards compatibility.
1983          * @see WikiPage::checkFlags
1984          */
1985         public function checkFlags( $flags ) {
1986                 return $this->mPage->checkFlags( $flags );
1987         }
1988
1989         /**
1990          * Call to WikiPage function for backwards compatibility.
1991          * @see WikiPage::checkTouched
1992          */
1993         public function checkTouched() {
1994                 return $this->mPage->checkTouched();
1995         }
1996
1997         /**
1998          * Call to WikiPage function for backwards compatibility.
1999          * @see WikiPage::clearPreparedEdit
2000          */
2001         public function clearPreparedEdit() {
2002                 $this->mPage->clearPreparedEdit();
2003         }
2004
2005         /**
2006          * Call to WikiPage function for backwards compatibility.
2007          * @see WikiPage::doDeleteArticleReal
2008          */
2009         public function doDeleteArticleReal(
2010                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2011                 $tags = []
2012         ) {
2013                 return $this->mPage->doDeleteArticleReal(
2014                         $reason, $suppress, $u1, $u2, $error, $user, $tags
2015                 );
2016         }
2017
2018         /**
2019          * Call to WikiPage function for backwards compatibility.
2020          * @see WikiPage::doDeleteUpdates
2021          */
2022         public function doDeleteUpdates( $id, Content $content = null ) {
2023                 return $this->mPage->doDeleteUpdates( $id, $content );
2024         }
2025
2026         /**
2027          * Call to WikiPage function for backwards compatibility.
2028          * @see WikiPage::doEditContent
2029          */
2030         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
2031                 User $user = null, $serialFormat = null
2032         ) {
2033                 return $this->mPage->doEditContent( $content, $summary, $flags, $baseRevId,
2034                         $user, $serialFormat
2035                 );
2036         }
2037
2038         /**
2039          * Call to WikiPage function for backwards compatibility.
2040          * @see WikiPage::doEditUpdates
2041          */
2042         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2043                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2044         }
2045
2046         /**
2047          * Call to WikiPage function for backwards compatibility.
2048          * @see WikiPage::doPurge
2049          */
2050         public function doPurge( $flags = WikiPage::PURGE_ALL ) {
2051                 return $this->mPage->doPurge( $flags );
2052         }
2053
2054         /**
2055          * Call to WikiPage function for backwards compatibility.
2056          * @see WikiPage::getLastPurgeTimestamp
2057          */
2058         public function getLastPurgeTimestamp() {
2059                 return $this->mPage->getLastPurgeTimestamp();
2060         }
2061
2062         /**
2063          * Call to WikiPage function for backwards compatibility.
2064          * @see WikiPage::doViewUpdates
2065          */
2066         public function doViewUpdates( User $user, $oldid = 0 ) {
2067                 $this->mPage->doViewUpdates( $user, $oldid );
2068         }
2069
2070         /**
2071          * Call to WikiPage function for backwards compatibility.
2072          * @see WikiPage::exists
2073          */
2074         public function exists() {
2075                 return $this->mPage->exists();
2076         }
2077
2078         /**
2079          * Call to WikiPage function for backwards compatibility.
2080          * @see WikiPage::followRedirect
2081          */
2082         public function followRedirect() {
2083                 return $this->mPage->followRedirect();
2084         }
2085
2086         /**
2087          * Call to WikiPage function for backwards compatibility.
2088          * @see ContentHandler::getActionOverrides
2089          */
2090         public function getActionOverrides() {
2091                 return $this->mPage->getActionOverrides();
2092         }
2093
2094         /**
2095          * Call to WikiPage function for backwards compatibility.
2096          * @see WikiPage::getAutoDeleteReason
2097          */
2098         public function getAutoDeleteReason( &$hasHistory ) {
2099                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2100         }
2101
2102         /**
2103          * Call to WikiPage function for backwards compatibility.
2104          * @see WikiPage::getCategories
2105          */
2106         public function getCategories() {
2107                 return $this->mPage->getCategories();
2108         }
2109
2110         /**
2111          * Call to WikiPage function for backwards compatibility.
2112          * @see WikiPage::getComment
2113          */
2114         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2115                 return $this->mPage->getComment( $audience, $user );
2116         }
2117
2118         /**
2119          * Call to WikiPage function for backwards compatibility.
2120          * @see WikiPage::getContentHandler
2121          */
2122         public function getContentHandler() {
2123                 return $this->mPage->getContentHandler();
2124         }
2125
2126         /**
2127          * Call to WikiPage function for backwards compatibility.
2128          * @see WikiPage::getContentModel
2129          */
2130         public function getContentModel() {
2131                 return $this->mPage->getContentModel();
2132         }
2133
2134         /**
2135          * Call to WikiPage function for backwards compatibility.
2136          * @see WikiPage::getContributors
2137          */
2138         public function getContributors() {
2139                 return $this->mPage->getContributors();
2140         }
2141
2142         /**
2143          * Call to WikiPage function for backwards compatibility.
2144          * @see WikiPage::getCreator
2145          */
2146         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2147                 return $this->mPage->getCreator( $audience, $user );
2148         }
2149
2150         /**
2151          * Call to WikiPage function for backwards compatibility.
2152          * @see WikiPage::getDeletionUpdates
2153          */
2154         public function getDeletionUpdates( Content $content = null ) {
2155                 return $this->mPage->getDeletionUpdates( $content );
2156         }
2157
2158         /**
2159          * Call to WikiPage function for backwards compatibility.
2160          * @see WikiPage::getHiddenCategories
2161          */
2162         public function getHiddenCategories() {
2163                 return $this->mPage->getHiddenCategories();
2164         }
2165
2166         /**
2167          * Call to WikiPage function for backwards compatibility.
2168          * @see WikiPage::getId
2169          */
2170         public function getId() {
2171                 return $this->mPage->getId();
2172         }
2173
2174         /**
2175          * Call to WikiPage function for backwards compatibility.
2176          * @see WikiPage::getLatest
2177          */
2178         public function getLatest() {
2179                 return $this->mPage->getLatest();
2180         }
2181
2182         /**
2183          * Call to WikiPage function for backwards compatibility.
2184          * @see WikiPage::getLinksTimestamp
2185          */
2186         public function getLinksTimestamp() {
2187                 return $this->mPage->getLinksTimestamp();
2188         }
2189
2190         /**
2191          * Call to WikiPage function for backwards compatibility.
2192          * @see WikiPage::getMinorEdit
2193          */
2194         public function getMinorEdit() {
2195                 return $this->mPage->getMinorEdit();
2196         }
2197
2198         /**
2199          * Call to WikiPage function for backwards compatibility.
2200          * @see WikiPage::getOldestRevision
2201          */
2202         public function getOldestRevision() {
2203                 return $this->mPage->getOldestRevision();
2204         }
2205
2206         /**
2207          * Call to WikiPage function for backwards compatibility.
2208          * @see WikiPage::getRedirectTarget
2209          */
2210         public function getRedirectTarget() {
2211                 return $this->mPage->getRedirectTarget();
2212         }
2213
2214         /**
2215          * Call to WikiPage function for backwards compatibility.
2216          * @see WikiPage::getRedirectURL
2217          */
2218         public function getRedirectURL( $rt ) {
2219                 return $this->mPage->getRedirectURL( $rt );
2220         }
2221
2222         /**
2223          * Call to WikiPage function for backwards compatibility.
2224          * @see WikiPage::getRevision
2225          */
2226         public function getRevision() {
2227                 return $this->mPage->getRevision();
2228         }
2229
2230         /**
2231          * Call to WikiPage function for backwards compatibility.
2232          * @see WikiPage::getTimestamp
2233          */
2234         public function getTimestamp() {
2235                 return $this->mPage->getTimestamp();
2236         }
2237
2238         /**
2239          * Call to WikiPage function for backwards compatibility.
2240          * @see WikiPage::getTouched
2241          */
2242         public function getTouched() {
2243                 return $this->mPage->getTouched();
2244         }
2245
2246         /**
2247          * Call to WikiPage function for backwards compatibility.
2248          * @see WikiPage::getUndoContent
2249          */
2250         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2251                 return $this->mPage->getUndoContent( $undo, $undoafter );
2252         }
2253
2254         /**
2255          * Call to WikiPage function for backwards compatibility.
2256          * @see WikiPage::getUser
2257          */
2258         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2259                 return $this->mPage->getUser( $audience, $user );
2260         }
2261
2262         /**
2263          * Call to WikiPage function for backwards compatibility.
2264          * @see WikiPage::getUserText
2265          */
2266         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2267                 return $this->mPage->getUserText( $audience, $user );
2268         }
2269
2270         /**
2271          * Call to WikiPage function for backwards compatibility.
2272          * @see WikiPage::hasViewableContent
2273          */
2274         public function hasViewableContent() {
2275                 return $this->mPage->hasViewableContent();
2276         }
2277
2278         /**
2279          * Call to WikiPage function for backwards compatibility.
2280          * @see WikiPage::insertOn
2281          */
2282         public function insertOn( $dbw, $pageId = null ) {
2283                 return $this->mPage->insertOn( $dbw, $pageId );
2284         }
2285
2286         /**
2287          * Call to WikiPage function for backwards compatibility.
2288          * @see WikiPage::insertProtectNullRevision
2289          */
2290         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2291                 array $expiry, $cascade, $reason, $user = null
2292         ) {
2293                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2294                         $expiry, $cascade, $reason, $user
2295                 );
2296         }
2297
2298         /**
2299          * Call to WikiPage function for backwards compatibility.
2300          * @see WikiPage::insertRedirect
2301          */
2302         public function insertRedirect() {
2303                 return $this->mPage->insertRedirect();
2304         }
2305
2306         /**
2307          * Call to WikiPage function for backwards compatibility.
2308          * @see WikiPage::insertRedirectEntry
2309          */
2310         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2311                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2312         }
2313
2314         /**
2315          * Call to WikiPage function for backwards compatibility.
2316          * @see WikiPage::isCountable
2317          */
2318         public function isCountable( $editInfo = false ) {
2319                 return $this->mPage->isCountable( $editInfo );
2320         }
2321
2322         /**
2323          * Call to WikiPage function for backwards compatibility.
2324          * @see WikiPage::isRedirect
2325          */
2326         public function isRedirect() {
2327                 return $this->mPage->isRedirect();
2328         }
2329
2330         /**
2331          * Call to WikiPage function for backwards compatibility.
2332          * @see WikiPage::loadFromRow
2333          */
2334         public function loadFromRow( $data, $from ) {
2335                 return $this->mPage->loadFromRow( $data, $from );
2336         }
2337
2338         /**
2339          * Call to WikiPage function for backwards compatibility.
2340          * @see WikiPage::loadPageData
2341          */
2342         public function loadPageData( $from = 'fromdb' ) {
2343                 $this->mPage->loadPageData( $from );
2344         }
2345
2346         /**
2347          * Call to WikiPage function for backwards compatibility.
2348          * @see WikiPage::lockAndGetLatest
2349          */
2350         public function lockAndGetLatest() {
2351                 return $this->mPage->lockAndGetLatest();
2352         }
2353
2354         /**
2355          * Call to WikiPage function for backwards compatibility.
2356          * @see WikiPage::makeParserOptions
2357          */
2358         public function makeParserOptions( $context ) {
2359                 return $this->mPage->makeParserOptions( $context );
2360         }
2361
2362         /**
2363          * Call to WikiPage function for backwards compatibility.
2364          * @see WikiPage::pageDataFromId
2365          */
2366         public function pageDataFromId( $dbr, $id, $options = [] ) {
2367                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2368         }
2369
2370         /**
2371          * Call to WikiPage function for backwards compatibility.
2372          * @see WikiPage::pageDataFromTitle
2373          */
2374         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2375                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2376         }
2377
2378         /**
2379          * Call to WikiPage function for backwards compatibility.
2380          * @see WikiPage::prepareContentForEdit
2381          */
2382         public function prepareContentForEdit(
2383                 Content $content, $revision = null, User $user = null,
2384                 $serialFormat = null, $useCache = true
2385         ) {
2386                 return $this->mPage->prepareContentForEdit(
2387                         $content, $revision, $user,
2388                         $serialFormat, $useCache
2389                 );
2390         }
2391
2392         /**
2393          * Call to WikiPage function for backwards compatibility.
2394          * @see WikiPage::protectDescription
2395          */
2396         public function protectDescription( array $limit, array $expiry ) {
2397                 return $this->mPage->protectDescription( $limit, $expiry );
2398         }
2399
2400         /**
2401          * Call to WikiPage function for backwards compatibility.
2402          * @see WikiPage::protectDescriptionLog
2403          */
2404         public function protectDescriptionLog( array $limit, array $expiry ) {
2405                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2406         }
2407
2408         /**
2409          * Call to WikiPage function for backwards compatibility.
2410          * @see WikiPage::replaceSectionAtRev
2411          */
2412         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2413                 $sectionTitle = '', $baseRevId = null
2414         ) {
2415                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2416                         $sectionTitle, $baseRevId
2417                 );
2418         }
2419
2420         /**
2421          * Call to WikiPage function for backwards compatibility.
2422          * @see WikiPage::replaceSectionContent
2423          */
2424         public function replaceSectionContent(
2425                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2426         ) {
2427                 return $this->mPage->replaceSectionContent(
2428                         $sectionId, $sectionContent, $sectionTitle, $edittime
2429                 );
2430         }
2431
2432         /**
2433          * Call to WikiPage function for backwards compatibility.
2434          * @see WikiPage::setTimestamp
2435          */
2436         public function setTimestamp( $ts ) {
2437                 return $this->mPage->setTimestamp( $ts );
2438         }
2439
2440         /**
2441          * Call to WikiPage function for backwards compatibility.
2442          * @see WikiPage::shouldCheckParserCache
2443          */
2444         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2445                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2446         }
2447
2448         /**
2449          * Call to WikiPage function for backwards compatibility.
2450          * @see WikiPage::supportsSections
2451          */
2452         public function supportsSections() {
2453                 return $this->mPage->supportsSections();
2454         }
2455
2456         /**
2457          * Call to WikiPage function for backwards compatibility.
2458          * @see WikiPage::triggerOpportunisticLinksUpdate
2459          */
2460         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2461                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2462         }
2463
2464         /**
2465          * Call to WikiPage function for backwards compatibility.
2466          * @see WikiPage::updateCategoryCounts
2467          */
2468         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2469                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2470         }
2471
2472         /**
2473          * Call to WikiPage function for backwards compatibility.
2474          * @see WikiPage::updateIfNewerOn
2475          */
2476         public function updateIfNewerOn( $dbw, $revision ) {
2477                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2478         }
2479
2480         /**
2481          * Call to WikiPage function for backwards compatibility.
2482          * @see WikiPage::updateRedirectOn
2483          */
2484         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2485                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null );
2486         }
2487
2488         /**
2489          * Call to WikiPage function for backwards compatibility.
2490          * @see WikiPage::updateRevisionOn
2491          */
2492         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2493                 $lastRevIsRedirect = null
2494         ) {
2495                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2496                         $lastRevIsRedirect
2497                 );
2498         }
2499
2500         /**
2501          * @param array $limit
2502          * @param array $expiry
2503          * @param bool $cascade
2504          * @param string $reason
2505          * @param User $user
2506          * @return Status
2507          */
2508         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2509                 $reason, User $user
2510         ) {
2511                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2512         }
2513
2514         /**
2515          * @param array $limit
2516          * @param string $reason
2517          * @param int $cascade
2518          * @param array $expiry
2519          * @return bool
2520          */
2521         public function updateRestrictions( $limit = [], $reason = '',
2522                 &$cascade = 0, $expiry = []
2523         ) {
2524                 return $this->mPage->doUpdateRestrictions(
2525                         $limit,
2526                         $expiry,
2527                         $cascade,
2528                         $reason,
2529                         $this->getContext()->getUser()
2530                 );
2531         }
2532
2533         /**
2534          * @param string $reason
2535          * @param bool $suppress
2536          * @param int $u1 Unused
2537          * @param bool $u2 Unused
2538          * @param string $error
2539          * @return bool
2540          */
2541         public function doDeleteArticle(
2542                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = ''
2543         ) {
2544                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error );
2545         }
2546
2547         /**
2548          * @param string $fromP
2549          * @param string $summary
2550          * @param string $token
2551          * @param bool $bot
2552          * @param array $resultDetails
2553          * @param User|null $user
2554          * @return array
2555          */
2556         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2557                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2558                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2559         }
2560
2561         /**
2562          * @param string $fromP
2563          * @param string $summary
2564          * @param bool $bot
2565          * @param array $resultDetails
2566          * @param User|null $guser
2567          * @return array
2568          */
2569         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2570                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2571                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2572         }
2573
2574         /**
2575          * @param bool $hasHistory
2576          * @return mixed
2577          */
2578         public function generateReason( &$hasHistory ) {
2579                 $title = $this->mPage->getTitle();
2580                 $handler = ContentHandler::getForTitle( $title );
2581                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2582         }
2583
2584         /**
2585          * @return array
2586          *
2587          * @deprecated since 1.24, use WikiPage::selectFields() instead
2588          */
2589         public static function selectFields() {
2590                 wfDeprecated( __METHOD__, '1.24' );
2591                 return WikiPage::selectFields();
2592         }
2593
2594         /**
2595          * @param Title $title
2596          *
2597          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2598          */
2599         public static function onArticleCreate( $title ) {
2600                 wfDeprecated( __METHOD__, '1.24' );
2601                 WikiPage::onArticleCreate( $title );
2602         }
2603
2604         /**
2605          * @param Title $title
2606          *
2607          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2608          */
2609         public static function onArticleDelete( $title ) {
2610                 wfDeprecated( __METHOD__, '1.24' );
2611                 WikiPage::onArticleDelete( $title );
2612         }
2613
2614         /**
2615          * @param Title $title
2616          *
2617          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2618          */
2619         public static function onArticleEdit( $title ) {
2620                 wfDeprecated( __METHOD__, '1.24' );
2621                 WikiPage::onArticleEdit( $title );
2622         }
2623
2624         // ******
2625 }