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                 # @todo FIXME: Doesn't inherit right
 103                 return $t == null ? null : new self( $t );
 104                 # return $t == null ? null : new static( $t ); // PHP 5.3
 105         }
 106
 107         /**
 108          * Create an Article object of the appropriate class for the given page.
 109          *
 110          * @param Title $title
 111          * @param IContextSource $context
 112          * @return Article
 113          */
 114         public static function newFromTitle( $title, IContextSource $context ) {
 115                 if ( NS_MEDIA == $title->getNamespace() ) {
 116                         // FIXME: where should this go?
 117                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 118                 }
 119
 120                 $page = null;
 121                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 122                 if ( !$page ) {
 123                         switch ( $title->getNamespace() ) {
 124                                 case NS_FILE:
 125                                         $page = new ImagePage( $title );
 126                                         break;
 127                                 case NS_CATEGORY:
 128                                         $page = new CategoryPage( $title );
 129                                         break;
 130                                 default:
 131                                         $page = new Article( $title );
 132                         }
 133                 }
 134                 $page->setContext( $context );
 135
 136                 return $page;
 137         }
 138
 139         /**
 140          * Create an Article object of the appropriate class for the given page.
 141          *
 142          * @param WikiPage $page
 143          * @param IContextSource $context
 144          * @return Article
 145          */
 146         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 147                 $article = self::newFromTitle( $page->getTitle(), $context );
 148                 $article->mPage = $page; // override to keep process cached vars
 149                 return $article;
 150         }
 151
 152         /**
 153          * Tell the page view functions that this view was redirected
 154          * from another page on the wiki.
 155          * @param Title $from
 156          */
 157         public function setRedirectedFrom( Title $from ) {
 158                 $this->mRedirectedFrom = $from;
 159         }
 160
 161         /**
 162          * Get the title object of the article
 163          *
 164          * @return Title Title object of this page
 165          */
 166         public function getTitle() {
 167                 return $this->mPage->getTitle();
 168         }
 169
 170         /**
 171          * Get the WikiPage object of this instance
 172          *
 173          * @since 1.19
 174          * @return WikiPage
 175          */
 176         public function getPage() {
 177                 return $this->mPage;
 178         }
 179
 180         /**
 181          * Clear the object
 182          */
 183         public function clear() {
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRevIdFetched = 0;
 188                 $this->mRedirectUrl = false;
 189
 190                 $this->mPage->clear();
 191         }
 192
 193         /**
 194          * Note that getContent does not follow redirects anymore.
 195          * If you need to fetch redirectable content easily, try
 196          * the shortcut in WikiPage::getRedirectTarget()
 197          *
 198          * This function has side effects! Do not use this function if you
 199          * only want the real revision text if any.
 200          *
 201          * @deprecated since 1.21; use WikiPage::getContent() instead
 202          *
 203          * @return string Return the text of this revision
 204          */
 205         public function getContent() {
 206                 ContentHandler::deprecated( __METHOD__, '1.21' );
 207                 $content = $this->getContentObject();
 208                 return ContentHandler::getContentText( $content );
 209         }
 210
 211         /**
 212          * Returns a Content object representing the pages effective display content,
 213          * not necessarily the revision's content!
 214          *
 215          * Note that getContent does not follow redirects anymore.
 216          * If you need to fetch redirectable content easily, try
 217          * the shortcut in WikiPage::getRedirectTarget()
 218          *
 219          * This function has side effects! Do not use this function if you
 220          * only want the real revision text if any.
 221          *
 222          * @return Content Return the content of this revision
 223          *
 224          * @since 1.21
 225          */
 226         protected function getContentObject() {
 227
 228                 if ( $this->mPage->getId() === 0 ) {
 229                         # If this is a MediaWiki:x message, then load the messages
 230                         # and return the message value for x.
 231                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 232                                 $text = $this->getTitle()->getDefaultMessageText();
 233                                 if ( $text === false ) {
 234                                         $text = '';
 235                                 }
 236
 237                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 238                         } else {
 239                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 240                                 $content = new MessageContent( $message, null, 'parsemag' );
 241                         }
 242                 } else {
 243                         $this->fetchContentObject();
 244                         $content = $this->mContentObject;
 245                 }
 246
 247                 return $content;
 248         }
 249
 250         /**
 251          * @return int The oldid of the article that is to be shown, 0 for the current revision
 252          */
 253         public function getOldID() {
 254                 if ( is_null( $this->mOldId ) ) {
 255                         $this->mOldId = $this->getOldIDFromRequest();
 256                 }
 257
 258                 return $this->mOldId;
 259         }
 260
 261         /**
 262          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 263          *
 264          * @return int The old id for the request
 265          */
 266         public function getOldIDFromRequest() {
 267                 $this->mRedirectUrl = false;
 268
 269                 $request = $this->getContext()->getRequest();
 270                 $oldid = $request->getIntOrNull( 'oldid' );
 271
 272                 if ( $oldid === null ) {
 273                         return 0;
 274                 }
 275
 276                 if ( $oldid !== 0 ) {
 277                         # Load the given revision and check whether the page is another one.
 278                         # In that case, update this instance to reflect the change.
 279                         if ( $oldid === $this->mPage->getLatest() ) {
 280                                 $this->mRevision = $this->mPage->getRevision();
 281                         } else {
 282                                 $this->mRevision = Revision::newFromId( $oldid );
 283                                 if ( $this->mRevision !== null ) {
 284                                         // Revision title doesn't match the page title given?
 285                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 286                                                 $function = [ get_class( $this->mPage ), 'newFromID' ];
 287                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 288                                         }
 289                                 }
 290                         }
 291                 }
 292
 293                 if ( $request->getVal( 'direction' ) == 'next' ) {
 294                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 295                         if ( $nextid ) {
 296                                 $oldid = $nextid;
 297                                 $this->mRevision = null;
 298                         } else {
 299                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 300                         }
 301                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 302                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 303                         if ( $previd ) {
 304                                 $oldid = $previd;
 305                                 $this->mRevision = null;
 306                         }
 307                 }
 308
 309                 return $oldid;
 310         }
 311
 312         /**
 313          * Get text of an article from database
 314          * Does *NOT* follow redirects.
 315          *
 316          * @protected
 317          * @note This is really internal functionality that should really NOT be
 318          * used by other functions. For accessing article content, use the WikiPage
 319          * class, especially WikiBase::getContent(). However, a lot of legacy code
 320          * uses this method to retrieve page text from the database, so the function
 321          * has to remain public for now.
 322          *
 323          * @return string|bool String containing article contents, or false if null
 324          * @deprecated since 1.21, use WikiPage::getContent() instead
 325          */
 326         function fetchContent() {
 327                 // BC cruft!
 328
 329                 ContentHandler::deprecated( __METHOD__, '1.21' );
 330
 331                 if ( $this->mContentLoaded && $this->mContent ) {
 332                         return $this->mContent;
 333                 }
 334
 335                 $content = $this->fetchContentObject();
 336
 337                 if ( !$content ) {
 338                         return false;
 339                 }
 340
 341                 // @todo Get rid of mContent everywhere!
 342                 $this->mContent = ContentHandler::getContentText( $content );
 343                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', [ &$this, &$this->mContent ] );
 344
 345                 return $this->mContent;
 346         }
 347
 348         /**
 349          * Get text content object
 350          * Does *NOT* follow redirects.
 351          * @todo When is this null?
 352          *
 353          * @note Code that wants to retrieve page content from the database should
 354          * use WikiPage::getContent().
 355          *
 356          * @return Content|null|bool
 357          *
 358          * @since 1.21
 359          */
 360         protected function fetchContentObject() {
 361                 if ( $this->mContentLoaded ) {
 362                         return $this->mContentObject;
 363                 }
 364
 365                 $this->mContentLoaded = true;
 366                 $this->mContent = null;
 367
 368                 $oldid = $this->getOldID();
 369
 370                 # Pre-fill content with error message so that if something
 371                 # fails we'll have something telling us what we intended.
 372                 // XXX: this isn't page content but a UI message. horrible.
 373                 $this->mContentObject = new MessageContent( 'missing-revision', [ $oldid ] );
 374
 375                 if ( $oldid ) {
 376                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 377                         if ( !$this->mRevision ) {
 378                                 $this->mRevision = Revision::newFromId( $oldid );
 379                                 if ( !$this->mRevision ) {
 380                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 381                                         return false;
 382                                 }
 383                         }
 384                 } else {
 385                         $oldid = $this->mPage->getLatest();
 386                         if ( !$oldid ) {
 387                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 388                                         $this->getTitle()->getPrefixedText() . "\n" );
 389                                 return false;
 390                         }
 391
 392                         # Update error message with correct oldid
 393                         $this->mContentObject = new MessageContent( 'missing-revision', [ $oldid ] );
 394
 395                         $this->mRevision = $this->mPage->getRevision();
 396
 397                         if ( !$this->mRevision ) {
 398                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id $oldid\n" );
 399                                 return false;
 400                         }
 401                 }
 402
 403                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 404                 // We should instead work with the Revision object when we need it...
 405                 // Loads if user is allowed
 406                 $content = $this->mRevision->getContent(
 407                         Revision::FOR_THIS_USER,
 408                         $this->getContext()->getUser()
 409                 );
 410
 411                 if ( !$content ) {
 412                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 413                                 $this->mRevision->getId() . "\n" );
 414                         return false;
 415                 }
 416
 417                 $this->mContentObject = $content;
 418                 $this->mRevIdFetched = $this->mRevision->getId();
 419
 420                 Hooks::run( 'ArticleAfterFetchContentObject', [ &$this, &$this->mContentObject ] );
 421
 422                 return $this->mContentObject;
 423         }
 424
 425         /**
 426          * Returns true if the currently-referenced revision is the current edit
 427          * to this page (and it exists).
 428          * @return bool
 429          */
 430         public function isCurrent() {
 431                 # If no oldid, this is the current version.
 432                 if ( $this->getOldID() == 0 ) {
 433                         return true;
 434                 }
 435
 436                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 437         }
 438
 439         /**
 440          * Get the fetched Revision object depending on request parameters or null
 441          * on failure.
 442          *
 443          * @since 1.19
 444          * @return Revision|null
 445          */
 446         public function getRevisionFetched() {
 447                 $this->fetchContentObject();
 448
 449                 return $this->mRevision;
 450         }
 451
 452         /**
 453          * Use this to fetch the rev ID used on page views
 454          *
 455          * @return int Revision ID of last article revision
 456          */
 457         public function getRevIdFetched() {
 458                 if ( $this->mRevIdFetched ) {
 459                         return $this->mRevIdFetched;
 460                 } else {
 461                         return $this->mPage->getLatest();
 462                 }
 463         }
 464
 465         /**
 466          * This is the default action of the index.php entry point: just view the
 467          * page of the given title.
 468          */
 469         public function view() {
 470                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar, $wgMaxRedirects;
 471
 472                 # Get variables from query string
 473                 # As side effect this will load the revision and update the title
 474                 # in a revision ID is passed in the request, so this should remain
 475                 # the first call of this method even if $oldid is used way below.
 476                 $oldid = $this->getOldID();
 477
 478                 $user = $this->getContext()->getUser();
 479                 # Another whitelist check in case getOldID() is altering the title
 480                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 481                 if ( count( $permErrors ) ) {
 482                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 483                         throw new PermissionsError( 'read', $permErrors );
 484                 }
 485
 486                 $outputPage = $this->getContext()->getOutput();
 487                 # getOldID() may as well want us to redirect somewhere else
 488                 if ( $this->mRedirectUrl ) {
 489                         $outputPage->redirect( $this->mRedirectUrl );
 490                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 491
 492                         return;
 493                 }
 494
 495                 # If we got diff in the query, we want to see a diff page instead of the article.
 496                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 497                         wfDebug( __METHOD__ . ": showing diff page\n" );
 498                         $this->showDiffPage();
 499
 500                         return;
 501                 }
 502
 503                 # Set page title (may be overridden by DISPLAYTITLE)
 504                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 505
 506                 $outputPage->setArticleFlag( true );
 507                 # Allow frames by default
 508                 $outputPage->allowClickjacking();
 509
 510                 $parserCache = ParserCache::singleton();
 511
 512                 $parserOptions = $this->getParserOptions();
 513                 # Render printable version, use printable version cache
 514                 if ( $outputPage->isPrintable() ) {
 515                         $parserOptions->setIsPrintable( true );
 516                         $parserOptions->setEditSection( false );
 517                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 518                         $parserOptions->setEditSection( false );
 519                 }
 520
 521                 # Try client and file cache
 522                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 523                         if ( $wgUseETag ) {
 524                                 $outputPage->setETag( $parserCache->getETag( $this->mPage, $parserOptions ) );
 525                         }
 526
 527                         # Use the greatest of the page's timestamp or the timestamp of any
 528                         # redirect in the chain (bug 67849)
 529                         $timestamp = $this->mPage->getTouched();
 530                         if ( isset( $this->mRedirectedFrom ) ) {
 531                                 $timestamp = max( $timestamp, $this->mRedirectedFrom->getTouched() );
 532
 533                                 # If there can be more than one redirect in the chain, we have
 534                                 # to go through the whole chain too in case an intermediate
 535                                 # redirect was changed.
 536                                 if ( $wgMaxRedirects > 1 ) {
 537                                         $titles = Revision::newFromTitle( $this->mRedirectedFrom )
 538                                                 ->getContent( Revision::FOR_THIS_USER, $user )
 539                                                 ->getRedirectChain();
 540                                         $thisTitle = $this->getTitle();
 541                                         foreach ( $titles as $title ) {
 542                                                 if ( Title::compare( $title, $thisTitle ) === 0 ) {
 543                                                         break;
 544                                                 }
 545                                                 $timestamp = max( $timestamp, $title->getTouched() );
 546                                         }
 547                                 }
 548                         }
 549
 550                         # Is it client cached?
 551                         if ( $outputPage->checkLastModified( $timestamp ) ) {
 552                                 wfDebug( __METHOD__ . ": done 304\n" );
 553
 554                                 return;
 555                         # Try file cache
 556                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 557                                 wfDebug( __METHOD__ . ": done file cache\n" );
 558                                 # tell wgOut that output is taken care of
 559                                 $outputPage->disable();
 560                                 $this->mPage->doViewUpdates( $user, $oldid );
 561
 562                                 return;
 563                         }
 564                 }
 565
 566                 # Should the parser cache be used?
 567                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 568                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 569                 if ( $user->getStubThreshold() ) {
 570                         $this->getContext()->getStats()->increment( 'pcache_miss_stub' );
 571                 }
 572
 573                 $this->showRedirectedFromHeader();
 574                 $this->showNamespaceHeader();
 575
 576                 # Iterate through the possible ways of constructing the output text.
 577                 # Keep going until $outputDone is set, or we run out of things to do.
 578                 $pass = 0;
 579                 $outputDone = false;
 580                 $this->mParserOutput = false;
 581
 582                 while ( !$outputDone && ++$pass ) {
 583                         switch ( $pass ) {
 584                                 case 1:
 585                                         Hooks::run( 'ArticleViewHeader', [ &$this, &$outputDone, &$useParserCache ] );
 586                                         break;
 587                                 case 2:
 588                                         # Early abort if the page doesn't exist
 589                                         if ( !$this->mPage->exists() ) {
 590                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 591                                                 $this->showMissingArticle();
 592                                                 $this->mPage->doViewUpdates( $user );
 593                                                 return;
 594                                         }
 595
 596                                         # Try the parser cache
 597                                         if ( $useParserCache ) {
 598                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 599
 600                                                 if ( $this->mParserOutput !== false ) {
 601                                                         if ( $oldid ) {
 602                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 603                                                                 $this->setOldSubtitle( $oldid );
 604                                                         } else {
 605                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 606                                                         }
 607                                                         $outputPage->addParserOutput( $this->mParserOutput );
 608                                                         # Ensure that UI elements requiring revision ID have
 609                                                         # the correct version information.
 610                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 611                                                         # Preload timestamp to avoid a DB hit
 612                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 613                                                         if ( $cachedTimestamp !== null ) {
 614                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 615                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 616                                                         }
 617                                                         $outputDone = true;
 618                                                 }
 619                                         }
 620                                         break;
 621                                 case 3:
 622                                         # This will set $this->mRevision if needed
 623                                         $this->fetchContentObject();
 624
 625                                         # Are we looking at an old revision
 626                                         if ( $oldid && $this->mRevision ) {
 627                                                 $this->setOldSubtitle( $oldid );
 628
 629                                                 if ( !$this->showDeletedRevisionHeader() ) {
 630                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 631                                                         return;
 632                                                 }
 633                                         }
 634
 635                                         # Ensure that UI elements requiring revision ID have
 636                                         # the correct version information.
 637                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 638                                         # Preload timestamp to avoid a DB hit
 639                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 640
 641                                         # Pages containing custom CSS or JavaScript get special treatment
 642                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 643                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 644                                                 $this->showCssOrJsPage();
 645                                                 $outputDone = true;
 646                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 647                                                         [ $this->fetchContentObject(), $this->getTitle(), $outputPage ] ) ) {
 648
 649                                                 # Allow extensions do their own custom view for certain pages
 650                                                 $outputDone = true;
 651                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 652                                                         [ $this->fetchContentObject(), $this->getTitle(), $outputPage ] ) ) {
 653
 654                                                 # Allow extensions do their own custom view for certain pages
 655                                                 $outputDone = true;
 656                                         }
 657                                         break;
 658                                 case 4:
 659                                         # Run the parse, protected by a pool counter
 660                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 661
 662                                         $content = $this->getContentObject();
 663                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 664                                                 $this->getRevIdFetched(), $useParserCache, $content );
 665
 666                                         if ( !$poolArticleView->execute() ) {
 667                                                 $error = $poolArticleView->getError();
 668                                                 if ( $error ) {
 669                                                         $outputPage->clearHTML(); // for release() errors
 670                                                         $outputPage->enableClientCache( false );
 671                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 672
 673                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 674                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 675                                                 }
 676                                                 # Connection or timeout error
 677                                                 return;
 678                                         }
 679
 680                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 681                                         $outputPage->addParserOutput( $this->mParserOutput );
 682                                         if ( $content->getRedirectTarget() ) {
 683                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 684                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 685                                         }
 686
 687                                         # Don't cache a dirty ParserOutput object
 688                                         if ( $poolArticleView->getIsDirty() ) {
 689                                                 $outputPage->setCdnMaxage( 0 );
 690                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 691                                                         "sending anyway due to pool overload-->\n" );
 692                                         }
 693
 694                                         $outputDone = true;
 695                                         break;
 696                                 # Should be unreachable, but just in case...
 697                                 default:
 698                                         break 2;
 699                         }
 700                 }
 701
 702                 # Get the ParserOutput actually *displayed* here.
 703                 # Note that $this->mParserOutput is the *current*/oldid version output.
 704                 $pOutput = ( $outputDone instanceof ParserOutput )
 705                         ? $outputDone // object fetched by hook
 706                         : $this->mParserOutput;
 707
 708                 # Adjust title for main page & pages with displaytitle
 709                 if ( $pOutput ) {
 710                         $this->adjustDisplayTitle( $pOutput );
 711                 }
 712
 713                 # For the main page, overwrite the <title> element with the con-
 714                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 715                 # that's not empty).
 716                 # This message always exists because it is in the i18n files
 717                 if ( $this->getTitle()->isMainPage() ) {
 718                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 719                         if ( !$msg->isDisabled() ) {
 720                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 721                         }
 722                 }
 723
 724                 # Check for any __NOINDEX__ tags on the page using $pOutput
 725                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 726                 $outputPage->setIndexPolicy( $policy['index'] );
 727                 $outputPage->setFollowPolicy( $policy['follow'] );
 728
 729                 $this->showViewFooter();
 730                 $this->mPage->doViewUpdates( $user, $oldid );
 731
 732                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 733
 734         }
 735
 736         /**
 737          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 738          * @param ParserOutput $pOutput
 739          */
 740         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 741                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 742                 $titleText = $pOutput->getTitleText();
 743                 if ( strval( $titleText ) !== '' ) {
 744                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 745                 }
 746         }
 747
 748         /**
 749          * Show a diff page according to current request variables. For use within
 750          * Article::view() only, other callers should use the DifferenceEngine class.
 751          *
 752          */
 753         protected function showDiffPage() {
 754                 $request = $this->getContext()->getRequest();
 755                 $user = $this->getContext()->getUser();
 756                 $diff = $request->getVal( 'diff' );
 757                 $rcid = $request->getVal( 'rcid' );
 758                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 759                 $purge = $request->getVal( 'action' ) == 'purge';
 760                 $unhide = $request->getInt( 'unhide' ) == 1;
 761                 $oldid = $this->getOldID();
 762
 763                 $rev = $this->getRevisionFetched();
 764
 765                 if ( !$rev ) {
 766                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 767                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 768                                 ->params( $oldid )
 769                                 ->numParams( 1 )
 770                                 ->parseAsBlock();
 771                         $this->getContext()->getOutput()->addHTML( $msg );
 772                         return;
 773                 }
 774
 775                 $contentHandler = $rev->getContentHandler();
 776                 $de = $contentHandler->createDifferenceEngine(
 777                         $this->getContext(),
 778                         $oldid,
 779                         $diff,
 780                         $rcid,
 781                         $purge,
 782                         $unhide
 783                 );
 784
 785                 // DifferenceEngine directly fetched the revision:
 786                 $this->mRevIdFetched = $de->mNewid;
 787                 $de->showDiffPage( $diffOnly );
 788
 789                 // Run view updates for the newer revision being diffed (and shown
 790                 // below the diff if not $diffOnly).
 791                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 792                 // New can be false, convert it to 0 - this conveniently means the latest revision
 793                 $this->mPage->doViewUpdates( $user, (int)$new );
 794         }
 795
 796         /**
 797          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 798          * Article::view() only.
 799          *
 800          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 801          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 802          * more flexibility.
 803          *
 804          * @param bool $showCacheHint Whether to show a message telling the user
 805          *   to clear the browser cache (default: true).
 806          */
 807         protected function showCssOrJsPage( $showCacheHint = true ) {
 808                 $outputPage = $this->getContext()->getOutput();
 809
 810                 if ( $showCacheHint ) {
 811                         $dir = $this->getContext()->getLanguage()->getDir();
 812                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
 813
 814                         $outputPage->wrapWikiMsg(
 815                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 816                                 'clearyourcache'
 817                         );
 818                 }
 819
 820                 $this->fetchContentObject();
 821
 822                 if ( $this->mContentObject ) {
 823                         // Give hooks a chance to customise the output
 824                         if ( ContentHandler::runLegacyHooks(
 825                                 'ShowRawCssJs',
 826                                 [ $this->mContentObject, $this->getTitle(), $outputPage ] )
 827                         ) {
 828                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 829                                 // but excluding metadata like categories and language links
 830                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 831                                 $outputPage->addParserOutputContent( $po );
 832                         }
 833                 }
 834         }
 835
 836         /**
 837          * Get the robot policy to be used for the current view
 838          * @param string $action The action= GET parameter
 839          * @param ParserOutput|null $pOutput
 840          * @return array The policy that should be set
 841          * @todo actions other than 'view'
 842          */
 843         public function getRobotPolicy( $action, $pOutput = null ) {
 844                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 845
 846                 $ns = $this->getTitle()->getNamespace();
 847
 848                 # Don't index user and user talk pages for blocked users (bug 11443)
 849                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 850                         $specificTarget = null;
 851                         $vagueTarget = null;
 852                         $titleText = $this->getTitle()->getText();
 853                         if ( IP::isValid( $titleText ) ) {
 854                                 $vagueTarget = $titleText;
 855                         } else {
 856                                 $specificTarget = $titleText;
 857                         }
 858                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 859                                 return [
 860                                         'index' => 'noindex',
 861                                         'follow' => 'nofollow'
 862                                 ];
 863                         }
 864                 }
 865
 866                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 867                         # Non-articles (special pages etc), and old revisions
 868                         return [
 869                                 'index' => 'noindex',
 870                                 'follow' => 'nofollow'
 871                         ];
 872                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 873                         # Discourage indexing of printable versions, but encourage following
 874                         return [
 875                                 'index' => 'noindex',
 876                                 'follow' => 'follow'
 877                         ];
 878                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 879                         # For ?curid=x urls, disallow indexing
 880                         return [
 881                                 'index' => 'noindex',
 882                                 'follow' => 'follow'
 883                         ];
 884                 }
 885
 886                 # Otherwise, construct the policy based on the various config variables.
 887                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 888
 889                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 890                         # Honour customised robot policies for this namespace
 891                         $policy = array_merge(
 892                                 $policy,
 893                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 894                         );
 895                 }
 896                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 897                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 898                         # a final sanity check that we have really got the parser output.
 899                         $policy = array_merge(
 900                                 $policy,
 901                                 [ 'index' => $pOutput->getIndexPolicy() ]
 902                         );
 903                 }
 904
 905                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 906                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 907                         $policy = array_merge(
 908                                 $policy,
 909                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 910                         );
 911                 }
 912
 913                 return $policy;
 914         }
 915
 916         /**
 917          * Converts a String robot policy into an associative array, to allow
 918          * merging of several policies using array_merge().
 919          * @param array|string $policy Returns empty array on null/false/'', transparent
 920          *   to already-converted arrays, converts string.
 921          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 922          */
 923         public static function formatRobotPolicy( $policy ) {
 924                 if ( is_array( $policy ) ) {
 925                         return $policy;
 926                 } elseif ( !$policy ) {
 927                         return [];
 928                 }
 929
 930                 $policy = explode( ',', $policy );
 931                 $policy = array_map( 'trim', $policy );
 932
 933                 $arr = [];
 934                 foreach ( $policy as $var ) {
 935                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
 936                                 $arr['index'] = $var;
 937                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
 938                                 $arr['follow'] = $var;
 939                         }
 940                 }
 941
 942                 return $arr;
 943         }
 944
 945         /**
 946          * If this request is a redirect view, send "redirected from" subtitle to
 947          * the output. Returns true if the header was needed, false if this is not
 948          * a redirect view. Handles both local and remote redirects.
 949          *
 950          * @return bool
 951          */
 952         public function showRedirectedFromHeader() {
 953                 global $wgRedirectSources;
 954
 955                 $context = $this->getContext();
 956                 $outputPage = $context->getOutput();
 957                 $request = $context->getRequest();
 958                 $rdfrom = $request->getVal( 'rdfrom' );
 959
 960                 // Construct a URL for the current page view, but with the target title
 961                 $query = $request->getValues();
 962                 unset( $query['rdfrom'] );
 963                 unset( $query['title'] );
 964                 if ( $this->getTitle()->isRedirect() ) {
 965                         // Prevent double redirects
 966                         $query['redirect'] = 'no';
 967                 }
 968                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 969
 970                 if ( isset( $this->mRedirectedFrom ) ) {
 971                         // This is an internally redirected page view.
 972                         // We'll need a backlink to the source page for navigation.
 973                         if ( Hooks::run( 'ArticleViewRedirect', [ &$this ] ) ) {
 974                                 $redir = Linker::linkKnown(
 975                                         $this->mRedirectedFrom,
 976                                         null,
 977                                         [],
 978                                         [ 'redirect' => 'no' ]
 979                                 );
 980
 981                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 982                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 983                                 . "</span>" );
 984
 985                                 // Add the script to update the displayed URL and
 986                                 // set the fragment if one was specified in the redirect
 987                                 $outputPage->addJsConfigVars( [
 988                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 989                                 ] );
 990                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 991
 992                                 // Add a <link rel="canonical"> tag
 993                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
 994
 995                                 // Tell the output object that the user arrived at this article through a redirect
 996                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 997
 998                                 return true;
 999                         }
1000                 } elseif ( $rdfrom ) {
1001                         // This is an externally redirected view, from some other wiki.
1002                         // If it was reported from a trusted site, supply a backlink.
1003                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1004                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1005                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1006                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1007                                 . "</span>" );
1008
1009                                 // Add the script to update the displayed URL
1010                                 $outputPage->addJsConfigVars( [
1011                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1012                                 ] );
1013                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1014
1015                                 return true;
1016                         }
1017                 }
1018
1019                 return false;
1020         }
1021
1022         /**
1023          * Show a header specific to the namespace currently being viewed, like
1024          * [[MediaWiki:Talkpagetext]]. For Article::view().
1025          */
1026         public function showNamespaceHeader() {
1027                 if ( $this->getTitle()->isTalkPage() ) {
1028                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1029                                 $this->getContext()->getOutput()->wrapWikiMsg(
1030                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1031                                         [ 'talkpageheader' ]
1032                                 );
1033                         }
1034                 }
1035         }
1036
1037         /**
1038          * Show the footer section of an ordinary page view
1039          */
1040         public function showViewFooter() {
1041                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1042                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1043                         && IP::isValid( $this->getTitle()->getText() )
1044                 ) {
1045                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1046                 }
1047
1048                 // Show a footer allowing the user to patrol the shown revision or page if possible
1049                 $patrolFooterShown = $this->showPatrolFooter();
1050
1051                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1052         }
1053
1054         /**
1055          * If patrol is possible, output a patrol UI box. This is called from the
1056          * footer section of ordinary page views. If patrol is not possible or not
1057          * desired, does nothing.
1058          * Side effect: When the patrol link is build, this method will call
1059          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1060          *
1061          * @return bool
1062          */
1063         public function showPatrolFooter() {
1064                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol, $wgEnableAPI, $wgEnableWriteAPI;
1065
1066                 $outputPage = $this->getContext()->getOutput();
1067                 $user = $this->getContext()->getUser();
1068                 $title = $this->getTitle();
1069                 $rc = false;
1070
1071                 if ( !$title->quickUserCan( 'patrol', $user )
1072                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1073                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1074                 ) {
1075                         // Patrolling is disabled or the user isn't allowed to
1076                         return false;
1077                 }
1078
1079                 if ( $this->mRevision
1080                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1081                 ) {
1082                         // The current revision is already older than what could be in the RC table
1083                         // 6h tolerance because the RC might not be cleaned out regularly
1084                         return false;
1085                 }
1086
1087                 // Check for cached results
1088                 $key = wfMemcKey( 'unpatrollable-page', $title->getArticleID() );
1089                 $cache = ObjectCache::getMainWANInstance();
1090                 if ( $cache->get( $key ) ) {
1091                         return false;
1092                 }
1093
1094                 $dbr = wfGetDB( DB_SLAVE );
1095                 $oldestRevisionTimestamp = $dbr->selectField(
1096                         'revision',
1097                         'MIN( rev_timestamp )',
1098                         [ 'rev_page' => $title->getArticleID() ],
1099                         __METHOD__
1100                 );
1101
1102                 // New page patrol: Get the timestamp of the oldest revison which
1103                 // the revision table holds for the given page. Then we look
1104                 // whether it's within the RC lifespan and if it is, we try
1105                 // to get the recentchanges row belonging to that entry
1106                 // (with rc_new = 1).
1107                 $recentPageCreation = false;
1108                 if ( $oldestRevisionTimestamp
1109                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1110                 ) {
1111                         // 6h tolerance because the RC might not be cleaned out regularly
1112                         $recentPageCreation = true;
1113                         $rc = RecentChange::newFromConds(
1114                                 [
1115                                         'rc_new' => 1,
1116                                         'rc_timestamp' => $oldestRevisionTimestamp,
1117                                         'rc_namespace' => $title->getNamespace(),
1118                                         'rc_cur_id' => $title->getArticleID()
1119                                 ],
1120                                 __METHOD__
1121                         );
1122                         if ( $rc ) {
1123                                 // Use generic patrol message for new pages
1124                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1125                         }
1126                 }
1127
1128                 // File patrol: Get the timestamp of the latest upload for this page,
1129                 // check whether it is within the RC lifespan and if it is, we try
1130                 // to get the recentchanges row belonging to that entry
1131                 // (with rc_type = RC_LOG, rc_log_type = upload).
1132                 $recentFileUpload = false;
1133                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1134                         && $title->getNamespace() === NS_FILE ) {
1135                         // Retrieve timestamp of most recent upload
1136                         $newestUploadTimestamp = $dbr->selectField(
1137                                 'image',
1138                                 'MAX( img_timestamp )',
1139                                 [ 'img_name' => $title->getDBkey() ],
1140                                 __METHOD__
1141                         );
1142                         if ( $newestUploadTimestamp
1143                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1144                         ) {
1145                                 // 6h tolerance because the RC might not be cleaned out regularly
1146                                 $recentFileUpload = true;
1147                                 $rc = RecentChange::newFromConds(
1148                                         [
1149                                                 'rc_type' => RC_LOG,
1150                                                 'rc_log_type' => 'upload',
1151                                                 'rc_timestamp' => $newestUploadTimestamp,
1152                                                 'rc_namespace' => NS_FILE,
1153                                                 'rc_cur_id' => $title->getArticleID()
1154                                         ],
1155                                         __METHOD__,
1156                                         [ 'USE INDEX' => 'rc_timestamp' ]
1157                                 );
1158                                 if ( $rc ) {
1159                                         // Use patrol message specific to files
1160                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1161                                 }
1162                         }
1163                 }
1164
1165                 if ( !$recentPageCreation && !$recentFileUpload ) {
1166                         // Page creation and latest upload (for files) is too old to be in RC
1167
1168                         // We definitely can't patrol so cache the information
1169                         // When a new file version is uploaded, the cache is cleared
1170                         $cache->set( $key, '1' );
1171
1172                         return false;
1173                 }
1174
1175                 if ( !$rc ) {
1176                         // Don't cache: This can be hit if the page gets accessed very fast after
1177                         // its creation / latest upload or in case we have high slave lag. In case
1178                         // the revision is too old, we will already return above.
1179                         return false;
1180                 }
1181
1182                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1183                         // Patrolled RC entry around
1184
1185                         // Cache the information we gathered above in case we can't patrol
1186                         // Don't cache in case we can patrol as this could change
1187                         $cache->set( $key, '1' );
1188
1189                         return false;
1190                 }
1191
1192                 if ( $rc->getPerformer()->equals( $user ) ) {
1193                         // Don't show a patrol link for own creations/uploads. If the user could
1194                         // patrol them, they already would be patrolled
1195                         return false;
1196                 }
1197
1198                 $rcid = $rc->getAttribute( 'rc_id' );
1199
1200                 $token = $user->getEditToken( $rcid );
1201
1202                 $outputPage->preventClickjacking();
1203                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1204                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1205                 }
1206
1207                 $link = Linker::linkKnown(
1208                         $title,
1209                         $markPatrolledMsg->escaped(),
1210                         [],
1211                         [
1212                                 'action' => 'markpatrolled',
1213                                 'rcid' => $rcid,
1214                                 'token' => $token,
1215                         ]
1216                 );
1217
1218                 $outputPage->addHTML(
1219                         "<div class='patrollink'>" .
1220                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1221                         '</div>'
1222                 );
1223
1224                 return true;
1225         }
1226
1227         /**
1228          * Purge the cache used to check if it is worth showing the patrol footer
1229          * For example, it is done during re-uploads when file patrol is used.
1230          * @param int $articleID ID of the article to purge
1231          * @since 1.27
1232          */
1233         public static function purgePatrolFooterCache( $articleID ) {
1234                 $cache = ObjectCache::getMainWANInstance();
1235                 $cache->delete( wfMemcKey( 'unpatrollable-page', $articleID ) );
1236         }
1237
1238         /**
1239          * Show the error text for a missing article. For articles in the MediaWiki
1240          * namespace, show the default message text. To be called from Article::view().
1241          */
1242         public function showMissingArticle() {
1243                 global $wgSend404Code;
1244
1245                 $outputPage = $this->getContext()->getOutput();
1246                 // Whether the page is a root user page of an existing user (but not a subpage)
1247                 $validUserPage = false;
1248
1249                 $title = $this->getTitle();
1250
1251                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1252                 if ( $title->getNamespace() == NS_USER
1253                         || $title->getNamespace() == NS_USER_TALK
1254                 ) {
1255                         $rootPart = explode( '/', $title->getText() )[0];
1256                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1257                         $ip = User::isIP( $rootPart );
1258                         $block = Block::newFromTarget( $user, $user );
1259
1260                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1261                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1262                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1263                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1264                                 # Show log extract if the user is currently blocked
1265                                 LogEventsList::showLogExtract(
1266                                         $outputPage,
1267                                         'block',
1268                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1269                                         '',
1270                                         [
1271                                                 'lim' => 1,
1272                                                 'showIfEmpty' => false,
1273                                                 'msgKey' => [
1274                                                         'blocked-notice-logextract',
1275                                                         $user->getName() # Support GENDER in notice
1276                                                 ]
1277                                         ]
1278                                 );
1279                                 $validUserPage = !$title->isSubpage();
1280                         } else {
1281                                 $validUserPage = !$title->isSubpage();
1282                         }
1283                 }
1284
1285                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1286
1287                 # Show delete and move logs if there were any such events.
1288                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1289                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1290                 $cache = ObjectCache::getMainStashInstance();
1291                 $key = wfMemcKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1292                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1293                 if ( $loggedIn || $cache->get( $key ) ) {
1294                         $logTypes = [ 'delete', 'move' ];
1295                         $conds = [ "log_action != 'revision'" ];
1296                         // Give extensions a chance to hide their (unrelated) log entries
1297                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1298                         LogEventsList::showLogExtract(
1299                                 $outputPage,
1300                                 $logTypes,
1301                                 $title,
1302                                 '',
1303                                 [
1304                                         'lim' => 10,
1305                                         'conds' => $conds,
1306                                         'showIfEmpty' => false,
1307                                         'msgKey' => [ $loggedIn
1308                                                 ? 'moveddeleted-notice'
1309                                                 : 'moveddeleted-notice-recent'
1310                                         ]
1311                                 ]
1312                         );
1313                 }
1314
1315                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1316                         // If there's no backing content, send a 404 Not Found
1317                         // for better machine handling of broken links.
1318                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1319                 }
1320
1321                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1322                 $policy = $this->getRobotPolicy( 'view' );
1323                 $outputPage->setIndexPolicy( $policy['index'] );
1324                 $outputPage->setFollowPolicy( $policy['follow'] );
1325
1326                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1327
1328                 if ( !$hookResult ) {
1329                         return;
1330                 }
1331
1332                 # Show error message
1333                 $oldid = $this->getOldID();
1334                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1335                         $outputPage->addParserOutput( $this->getContentObject()->getParserOutput( $title ) );
1336                 } else {
1337                         if ( $oldid ) {
1338                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1339                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1340                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1341                         ) {
1342                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1343                                 $text = wfMessage( $message )->plain();
1344                         } else {
1345                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1346                         }
1347
1348                         $dir = $this->getContext()->getLanguage()->getDir();
1349                         $lang = $this->getContext()->getLanguage()->getCode();
1350                         $outputPage->addWikiText( Xml::openElement( 'div', [
1351                                 'class' => "noarticletext mw-content-$dir",
1352                                 'dir' => $dir,
1353                                 'lang' => $lang,
1354                         ] ) . "\n$text\n</div>" );
1355                 }
1356         }
1357
1358         /**
1359          * If the revision requested for view is deleted, check permissions.
1360          * Send either an error message or a warning header to the output.
1361          *
1362          * @return bool True if the view is allowed, false if not.
1363          */
1364         public function showDeletedRevisionHeader() {
1365                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1366                         // Not deleted
1367                         return true;
1368                 }
1369
1370                 $outputPage = $this->getContext()->getOutput();
1371                 $user = $this->getContext()->getUser();
1372                 // If the user is not allowed to see it...
1373                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1374                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1375                                 'rev-deleted-text-permission' );
1376
1377                         return false;
1378                 // If the user needs to confirm that they want to see it...
1379                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1380                         # Give explanation and add a link to view the revision...
1381                         $oldid = intval( $this->getOldID() );
1382                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1383                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1384                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1385                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1386                                 [ $msg, $link ] );
1387
1388                         return false;
1389                 // We are allowed to see...
1390                 } else {
1391                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1392                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1393                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1394
1395                         return true;
1396                 }
1397         }
1398
1399         /**
1400          * Generate the navigation links when browsing through an article revisions
1401          * It shows the information as:
1402          *   Revision as of \<date\>; view current revision
1403          *   \<- Previous version | Next Version -\>
1404          *
1405          * @param int $oldid Revision ID of this article revision
1406          */
1407         public function setOldSubtitle( $oldid = 0 ) {
1408                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$this, &$oldid ] ) ) {
1409                         return;
1410                 }
1411
1412                 $context = $this->getContext();
1413                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1414
1415                 # Cascade unhide param in links for easy deletion browsing
1416                 $extraParams = [];
1417                 if ( $unhide ) {
1418                         $extraParams['unhide'] = 1;
1419                 }
1420
1421                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1422                         $revision = $this->mRevision;
1423                 } else {
1424                         $revision = Revision::newFromId( $oldid );
1425                 }
1426
1427                 $timestamp = $revision->getTimestamp();
1428
1429                 $current = ( $oldid == $this->mPage->getLatest() );
1430                 $language = $context->getLanguage();
1431                 $user = $context->getUser();
1432
1433                 $td = $language->userTimeAndDate( $timestamp, $user );
1434                 $tddate = $language->userDate( $timestamp, $user );
1435                 $tdtime = $language->userTime( $timestamp, $user );
1436
1437                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1438                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1439
1440                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1441                         ? 'revision-info-current'
1442                         : 'revision-info';
1443
1444                 $outputPage = $context->getOutput();
1445                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" .
1446                         $context->msg( $infomsg, $td )
1447                                 ->rawParams( $userlinks )
1448                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1449                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1450                                 ->parse() .
1451                         "</div>"
1452                 );
1453
1454                 $lnk = $current
1455                         ? $context->msg( 'currentrevisionlink' )->escaped()
1456                         : Linker::linkKnown(
1457                                 $this->getTitle(),
1458                                 $context->msg( 'currentrevisionlink' )->escaped(),
1459                                 [],
1460                                 $extraParams
1461                         );
1462                 $curdiff = $current
1463                         ? $context->msg( 'diff' )->escaped()
1464                         : Linker::linkKnown(
1465                                 $this->getTitle(),
1466                                 $context->msg( 'diff' )->escaped(),
1467                                 [],
1468                                 [
1469                                         'diff' => 'cur',
1470                                         'oldid' => $oldid
1471                                 ] + $extraParams
1472                         );
1473                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1474                 $prevlink = $prev
1475                         ? Linker::linkKnown(
1476                                 $this->getTitle(),
1477                                 $context->msg( 'previousrevision' )->escaped(),
1478                                 [],
1479                                 [
1480                                         'direction' => 'prev',
1481                                         'oldid' => $oldid
1482                                 ] + $extraParams
1483                         )
1484                         : $context->msg( 'previousrevision' )->escaped();
1485                 $prevdiff = $prev
1486                         ? Linker::linkKnown(
1487                                 $this->getTitle(),
1488                                 $context->msg( 'diff' )->escaped(),
1489                                 [],
1490                                 [
1491                                         'diff' => 'prev',
1492                                         'oldid' => $oldid
1493                                 ] + $extraParams
1494                         )
1495                         : $context->msg( 'diff' )->escaped();
1496                 $nextlink = $current
1497                         ? $context->msg( 'nextrevision' )->escaped()
1498                         : Linker::linkKnown(
1499                                 $this->getTitle(),
1500                                 $context->msg( 'nextrevision' )->escaped(),
1501                                 [],
1502                                 [
1503                                         'direction' => 'next',
1504                                         'oldid' => $oldid
1505                                 ] + $extraParams
1506                         );
1507                 $nextdiff = $current
1508                         ? $context->msg( 'diff' )->escaped()
1509                         : Linker::linkKnown(
1510                                 $this->getTitle(),
1511                                 $context->msg( 'diff' )->escaped(),
1512                                 [],
1513                                 [
1514                                         'diff' => 'next',
1515                                         'oldid' => $oldid
1516                                 ] + $extraParams
1517                         );
1518
1519                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1520                 if ( $cdel !== '' ) {
1521                         $cdel .= ' ';
1522                 }
1523
1524                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1525                         $context->msg( 'revision-nav' )->rawParams(
1526                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1527                         )->escaped() . "</div>" );
1528         }
1529
1530         /**
1531          * Return the HTML for the top of a redirect page
1532          *
1533          * Chances are you should just be using the ParserOutput from
1534          * WikitextContent::getParserOutput instead of calling this for redirects.
1535          *
1536          * @param Title|array $target Destination(s) to redirect
1537          * @param bool $appendSubtitle [optional]
1538          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1539          * @return string Containing HTML with redirect link
1540          */
1541         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1542                 $lang = $this->getTitle()->getPageLanguage();
1543                 $out = $this->getContext()->getOutput();
1544                 if ( $appendSubtitle ) {
1545                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1546                 }
1547                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1548                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1549         }
1550
1551         /**
1552          * Return the HTML for the top of a redirect page
1553          *
1554          * Chances are you should just be using the ParserOutput from
1555          * WikitextContent::getParserOutput instead of calling this for redirects.
1556          *
1557          * @since 1.23
1558          * @param Language $lang
1559          * @param Title|array $target Destination(s) to redirect
1560          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1561          * @return string Containing HTML with redirect link
1562          */
1563         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1564                 if ( !is_array( $target ) ) {
1565                         $target = [ $target ];
1566                 }
1567
1568                 $html = '<ul class="redirectText">';
1569                 /** @var Title $title */
1570                 foreach ( $target as $title ) {
1571                         $html .= '<li>' . Linker::link(
1572                                 $title,
1573                                 htmlspecialchars( $title->getFullText() ),
1574                                 [],
1575                                 // Automatically append redirect=no to each link, since most of them are
1576                                 // redirect pages themselves.
1577                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1578                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1579                         ) . '</li>';
1580                 }
1581                 $html .= '</ul>';
1582
1583                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1584
1585                 return '<div class="redirectMsg">' .
1586                         '<p>' . $redirectToText . '</p>' .
1587                         $html .
1588                         '</div>';
1589         }
1590
1591         /**
1592          * Adds help link with an icon via page indicators.
1593          * Link target can be overridden by a local message containing a wikilink:
1594          * the message key is: 'namespace-' + namespace number + '-helppage'.
1595          * @param string $to Target MediaWiki.org page title or encoded URL.
1596          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1597          * @since 1.25
1598          */
1599         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1600                 $msg = wfMessage(
1601                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1602                 );
1603
1604                 $out = $this->getContext()->getOutput();
1605                 if ( !$msg->isDisabled() ) {
1606                         $helpUrl = Skin::makeUrl( $msg->plain() );
1607                         $out->addHelpLink( $helpUrl, true );
1608                 } else {
1609                         $out->addHelpLink( $to, $overrideBaseUrl );
1610                 }
1611         }
1612
1613         /**
1614          * Handle action=render
1615          */
1616         public function render() {
1617                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1618                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1619                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1620                 $this->view();
1621         }
1622
1623         /**
1624          * action=protect handler
1625          */
1626         public function protect() {
1627                 $form = new ProtectionForm( $this );
1628                 $form->execute();
1629         }
1630
1631         /**
1632          * action=unprotect handler (alias)
1633          */
1634         public function unprotect() {
1635                 $this->protect();
1636         }
1637
1638         /**
1639          * UI entry point for page deletion
1640          */
1641         public function delete() {
1642                 # This code desperately needs to be totally rewritten
1643
1644                 $title = $this->getTitle();
1645                 $context = $this->getContext();
1646                 $user = $context->getUser();
1647
1648                 # Check permissions
1649                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1650                 if ( count( $permissionErrors ) ) {
1651                         throw new PermissionsError( 'delete', $permissionErrors );
1652                 }
1653
1654                 # Read-only check...
1655                 if ( wfReadOnly() ) {
1656                         throw new ReadOnlyError;
1657                 }
1658
1659                 # Better double-check that it hasn't been deleted yet!
1660                 $this->mPage->loadPageData( 'fromdbmaster' );
1661                 if ( !$this->mPage->exists() ) {
1662                         $deleteLogPage = new LogPage( 'delete' );
1663                         $outputPage = $context->getOutput();
1664                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1665                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1666                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1667                                 );
1668                         $outputPage->addHTML(
1669                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1670                         );
1671                         LogEventsList::showLogExtract(
1672                                 $outputPage,
1673                                 'delete',
1674                                 $title
1675                         );
1676
1677                         return;
1678                 }
1679
1680                 $request = $context->getRequest();
1681                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1682                 $deleteReason = $request->getText( 'wpReason' );
1683
1684                 if ( $deleteReasonList == 'other' ) {
1685                         $reason = $deleteReason;
1686                 } elseif ( $deleteReason != '' ) {
1687                         // Entry from drop down menu + additional comment
1688                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1689                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1690                 } else {
1691                         $reason = $deleteReasonList;
1692                 }
1693
1694                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1695                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1696                 ) {
1697                         # Flag to hide all contents of the archived revisions
1698                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1699
1700                         $this->doDelete( $reason, $suppress );
1701
1702                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1703
1704                         return;
1705                 }
1706
1707                 // Generate deletion reason
1708                 $hasHistory = false;
1709                 if ( !$reason ) {
1710                         try {
1711                                 $reason = $this->generateReason( $hasHistory );
1712                         } catch ( Exception $e ) {
1713                                 # if a page is horribly broken, we still want to be able to
1714                                 # delete it. So be lenient about errors here.
1715                                 wfDebug( "Error while building auto delete summary: $e" );
1716                                 $reason = '';
1717                         }
1718                 }
1719
1720                 // If the page has a history, insert a warning
1721                 if ( $hasHistory ) {
1722                         $title = $this->getTitle();
1723
1724                         // The following can use the real revision count as this is only being shown for users
1725                         // that can delete this page.
1726                         // This, as a side-effect, also makes sure that the following query isn't being run for
1727                         // pages with a larger history, unless the user has the 'bigdelete' right
1728                         // (and is about to delete this page).
1729                         $dbr = wfGetDB( DB_SLAVE );
1730                         $revisions = $edits = (int)$dbr->selectField(
1731                                 'revision',
1732                                 'COUNT(rev_page)',
1733                                 [ 'rev_page' => $title->getArticleID() ],
1734                                 __METHOD__
1735                         );
1736
1737                         // @todo FIXME: i18n issue/patchwork message
1738                         $context->getOutput()->addHTML(
1739                                 '<strong class="mw-delete-warning-revisions">' .
1740                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1741                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1742                                         $context->msg( 'history' )->escaped(),
1743                                         [],
1744                                         [ 'action' => 'history' ] ) .
1745                                 '</strong>'
1746                         );
1747
1748                         if ( $title->isBigDeletion() ) {
1749                                 global $wgDeleteRevisionsLimit;
1750                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1751                                         [
1752                                                 'delete-warning-toobig',
1753                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1754                                         ]
1755                                 );
1756                         }
1757                 }
1758
1759                 $this->confirmDelete( $reason );
1760         }
1761
1762         /**
1763          * Output deletion confirmation dialog
1764          * @todo FIXME: Move to another file?
1765          * @param string $reason Prefilled reason
1766          */
1767         public function confirmDelete( $reason ) {
1768                 wfDebug( "Article::confirmDelete\n" );
1769
1770                 $title = $this->getTitle();
1771                 $ctx = $this->getContext();
1772                 $outputPage = $ctx->getOutput();
1773                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1774                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1775                 $outputPage->addBacklinkSubtitle( $title );
1776                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1777                 $backlinkCache = $title->getBacklinkCache();
1778                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1779                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1780                                 'deleting-backlinks-warning' );
1781                 }
1782                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1783
1784                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1785
1786                 $user = $this->getContext()->getUser();
1787
1788                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1789                         $suppress = Html::openElement( 'div', [ 'id' => 'wpDeleteSuppressRow' ] ) .
1790                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1791                                         'wpSuppress', 'wpSuppress', false, [ 'tabindex' => '4' ] ) .
1792                                 Html::closeElement( 'div' );
1793                 } else {
1794                         $suppress = '';
1795                 }
1796                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1797
1798                 $form = Html::openElement( 'form', [ 'method' => 'post',
1799                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ] ) .
1800                         Html::openElement( 'fieldset', [ 'id' => 'mw-delete-table' ] ) .
1801                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1802                         Html::openElement( 'div', [ 'id' => 'mw-deleteconfirm-table' ] ) .
1803                         Html::openElement( 'div', [ 'id' => 'wpDeleteReasonListRow' ] ) .
1804                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1805                         '&nbsp;' .
1806                         Xml::listDropDown(
1807                                 'wpDeleteReasonList',
1808                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1809                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1810                                 '',
1811                                 'wpReasonDropDown',
1812                                 1
1813                         ) .
1814                         Html::closeElement( 'div' ) .
1815                         Html::openElement( 'div', [ 'id' => 'wpDeleteReasonRow' ] ) .
1816                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1817                         '&nbsp;' .
1818                         Html::input( 'wpReason', $reason, 'text', [
1819                                 'size' => '60',
1820                                 'maxlength' => '255',
1821                                 'tabindex' => '2',
1822                                 'id' => 'wpReason',
1823                                 'class' => 'mw-ui-input-inline',
1824                                 'autofocus'
1825                         ] ) .
1826                         Html::closeElement( 'div' );
1827
1828                 # Disallow watching if user is not logged in
1829                 if ( $user->isLoggedIn() ) {
1830                         $form .=
1831                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1832                                                 'wpWatch', 'wpWatch', $checkWatch, [ 'tabindex' => '3' ] );
1833                 }
1834
1835                 $form .=
1836                                 Html::openElement( 'div' ) .
1837                                 $suppress .
1838                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1839                                                 [
1840                                                         'name' => 'wpConfirmB',
1841                                                         'id' => 'wpConfirmB',
1842                                                         'tabindex' => '5',
1843                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1844                                                 ]
1845                                         ) .
1846                                 Html::closeElement( 'div' ) .
1847                         Html::closeElement( 'div' ) .
1848                         Xml::closeElement( 'fieldset' ) .
1849                         Html::hidden(
1850                                 'wpEditToken',
1851                                 $user->getEditToken( [ 'delete', $title->getPrefixedText() ] )
1852                         ) .
1853                         Xml::closeElement( 'form' );
1854
1855                         if ( $user->isAllowed( 'editinterface' ) ) {
1856                                 $link = Linker::linkKnown(
1857                                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
1858                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1859                                         [],
1860                                         [ 'action' => 'edit' ]
1861                                 );
1862                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1863                         }
1864
1865                 $outputPage->addHTML( $form );
1866
1867                 $deleteLogPage = new LogPage( 'delete' );
1868                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1869                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1870         }
1871
1872         /**
1873          * Perform a deletion and output success or failure messages
1874          * @param string $reason
1875          * @param bool $suppress
1876          */
1877         public function doDelete( $reason, $suppress = false ) {
1878                 $error = '';
1879                 $context = $this->getContext();
1880                 $outputPage = $context->getOutput();
1881                 $user = $context->getUser();
1882                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user );
1883
1884                 if ( $status->isGood() ) {
1885                         $deleted = $this->getTitle()->getPrefixedText();
1886
1887                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1888                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1889
1890                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1891
1892                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1893
1894                         Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
1895
1896                         $outputPage->returnToMain( false );
1897                 } else {
1898                         $outputPage->setPageTitle(
1899                                 wfMessage( 'cannotdelete-title',
1900                                         $this->getTitle()->getPrefixedText() )
1901                         );
1902
1903                         if ( $error == '' ) {
1904                                 $outputPage->addWikiText(
1905                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1906                                 );
1907                                 $deleteLogPage = new LogPage( 'delete' );
1908                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1909
1910                                 LogEventsList::showLogExtract(
1911                                         $outputPage,
1912                                         'delete',
1913                                         $this->getTitle()
1914                                 );
1915                         } else {
1916                                 $outputPage->addHTML( $error );
1917                         }
1918                 }
1919         }
1920
1921         /* Caching functions */
1922
1923         /**
1924          * checkLastModified returns true if it has taken care of all
1925          * output to the client that is necessary for this request.
1926          * (that is, it has sent a cached version of the page)
1927          *
1928          * @return bool True if cached version send, false otherwise
1929          */
1930         protected function tryFileCache() {
1931                 static $called = false;
1932
1933                 if ( $called ) {
1934                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1935                         return false;
1936                 }
1937
1938                 $called = true;
1939                 if ( $this->isFileCacheable() ) {
1940                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1941                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1942                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1943                                 $cache->loadFromFileCache( $this->getContext() );
1944                                 return true;
1945                         } else {
1946                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1947                                 ob_start( [ &$cache, 'saveToFileCache' ] );
1948                         }
1949                 } else {
1950                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1951                 }
1952
1953                 return false;
1954         }
1955
1956         /**
1957          * Check if the page can be cached
1958          * @return bool
1959          */
1960         public function isFileCacheable() {
1961                 $cacheable = false;
1962
1963                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1964                         $cacheable = $this->mPage->getId()
1965                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1966                         // Extension may have reason to disable file caching on some pages.
1967                         if ( $cacheable ) {
1968                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$this ] );
1969                         }
1970                 }
1971
1972                 return $cacheable;
1973         }
1974
1975         /**#@-*/
1976
1977         /**
1978          * Lightweight method to get the parser output for a page, checking the parser cache
1979          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1980          * consider, so it's not appropriate to use there.
1981          *
1982          * @since 1.16 (r52326) for LiquidThreads
1983          *
1984          * @param int|null $oldid Revision ID or null
1985          * @param User $user The relevant user
1986          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1987          */
1988         public function getParserOutput( $oldid = null, User $user = null ) {
1989                 // XXX: bypasses mParserOptions and thus setParserOptions()
1990
1991                 if ( $user === null ) {
1992                         $parserOptions = $this->getParserOptions();
1993                 } else {
1994                         $parserOptions = $this->mPage->makeParserOptions( $user );
1995                 }
1996
1997                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1998         }
1999
2000         /**
2001          * Override the ParserOptions used to render the primary article wikitext.
2002          *
2003          * @param ParserOptions $options
2004          * @throws MWException If the parser options where already initialized.
2005          */
2006         public function setParserOptions( ParserOptions $options ) {
2007                 if ( $this->mParserOptions ) {
2008                         throw new MWException( "can't change parser options after they have already been set" );
2009                 }
2010
2011                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2012                 $this->mParserOptions = clone $options;
2013         }
2014
2015         /**
2016          * Get parser options suitable for rendering the primary article wikitext
2017          * @return ParserOptions
2018          */
2019         public function getParserOptions() {
2020                 if ( !$this->mParserOptions ) {
2021                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2022                 }
2023                 // Clone to allow modifications of the return value without affecting cache
2024                 return clone $this->mParserOptions;
2025         }
2026
2027         /**
2028          * Sets the context this Article is executed in
2029          *
2030          * @param IContextSource $context
2031          * @since 1.18
2032          */
2033         public function setContext( $context ) {
2034                 $this->mContext = $context;
2035         }
2036
2037         /**
2038          * Gets the context this Article is executed in
2039          *
2040          * @return IContextSource
2041          * @since 1.18
2042          */
2043         public function getContext() {
2044                 if ( $this->mContext instanceof IContextSource ) {
2045                         return $this->mContext;
2046                 } else {
2047                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2048                                 "Return RequestContext::getMain(); for sanity\n" );
2049                         return RequestContext::getMain();
2050                 }
2051         }
2052
2053         /**
2054          * Use PHP's magic __get handler to handle accessing of
2055          * raw WikiPage fields for backwards compatibility.
2056          *
2057          * @param string $fname Field name
2058          * @return mixed
2059          */
2060         public function __get( $fname ) {
2061                 if ( property_exists( $this->mPage, $fname ) ) {
2062                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2063                         return $this->mPage->$fname;
2064                 }
2065                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2066         }
2067
2068         /**
2069          * Use PHP's magic __set handler to handle setting of
2070          * raw WikiPage fields for backwards compatibility.
2071          *
2072          * @param string $fname Field name
2073          * @param mixed $fvalue New value
2074          */
2075         public function __set( $fname, $fvalue ) {
2076                 if ( property_exists( $this->mPage, $fname ) ) {
2077                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2078                         $this->mPage->$fname = $fvalue;
2079                 // Note: extensions may want to toss on new fields
2080                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2081                         $this->mPage->$fname = $fvalue;
2082                 } else {
2083                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2084                 }
2085         }
2086
2087         /**
2088          * Call to WikiPage function for backwards compatibility.
2089          * @see WikiPage::checkFlags
2090          */
2091         public function checkFlags( $flags ) {
2092                 return $this->mPage->checkFlags( $flags );
2093         }
2094
2095         /**
2096          * Call to WikiPage function for backwards compatibility.
2097          * @see WikiPage::checkTouched
2098          */
2099         public function checkTouched() {
2100                 return $this->mPage->checkTouched();
2101         }
2102
2103         /**
2104          * Call to WikiPage function for backwards compatibility.
2105          * @see WikiPage::clearPreparedEdit
2106          */
2107         public function clearPreparedEdit() {
2108                 $this->mPage->clearPreparedEdit();
2109         }
2110
2111         /**
2112          * Call to WikiPage function for backwards compatibility.
2113          * @see WikiPage::doDeleteArticleReal
2114          */
2115         public function doDeleteArticleReal(
2116                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2117         ) {
2118                 return $this->mPage->doDeleteArticleReal(
2119                         $reason, $suppress, $u1, $u2, $error, $user
2120                 );
2121         }
2122
2123         /**
2124          * Call to WikiPage function for backwards compatibility.
2125          * @see WikiPage::doDeleteUpdates
2126          */
2127         public function doDeleteUpdates( $id, Content $content = null ) {
2128                 return $this->mPage->doDeleteUpdates( $id, $content );
2129         }
2130
2131         /**
2132          * Call to WikiPage function for backwards compatibility.
2133          * @see WikiPage::doEdit
2134          */
2135         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2136                 ContentHandler::deprecated( __METHOD__, '1.21' );
2137                 return $this->mPage->doEdit( $text, $summary, $flags, $baseRevId, $user );
2138         }
2139
2140         /**
2141          * Call to WikiPage function for backwards compatibility.
2142          * @see WikiPage::doEditContent
2143          */
2144         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
2145                 User $user = null, $serialFormat = null
2146         ) {
2147                 return $this->mPage->doEditContent( $content, $summary, $flags, $baseRevId,
2148                         $user, $serialFormat
2149                 );
2150         }
2151
2152         /**
2153          * Call to WikiPage function for backwards compatibility.
2154          * @see WikiPage::doEditUpdates
2155          */
2156         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2157                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2158         }
2159
2160         /**
2161          * Call to WikiPage function for backwards compatibility.
2162          * @see WikiPage::doPurge
2163          */
2164         public function doPurge() {
2165                 return $this->mPage->doPurge();
2166         }
2167
2168         /**
2169          * Call to WikiPage function for backwards compatibility.
2170          * @see WikiPage::doQuickEditContent
2171          */
2172         public function doQuickEditContent(
2173                 Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
2174         ) {
2175                 return $this->mPage->doQuickEditContent(
2176                         $content, $user, $comment, $minor, $serialFormat
2177                 );
2178         }
2179
2180         /**
2181          * Call to WikiPage function for backwards compatibility.
2182          * @see WikiPage::doViewUpdates
2183          */
2184         public function doViewUpdates( User $user, $oldid = 0 ) {
2185                 $this->mPage->doViewUpdates( $user, $oldid );
2186         }
2187
2188         /**
2189          * Call to WikiPage function for backwards compatibility.
2190          * @see WikiPage::exists
2191          */
2192         public function exists() {
2193                 return $this->mPage->exists();
2194         }
2195
2196         /**
2197          * Call to WikiPage function for backwards compatibility.
2198          * @see WikiPage::followRedirect
2199          */
2200         public function followRedirect() {
2201                 return $this->mPage->followRedirect();
2202         }
2203
2204         /**
2205          * Call to WikiPage function for backwards compatibility.
2206          * @see WikiPage::getActionOverrides
2207          */
2208         public function getActionOverrides() {
2209                 return $this->mPage->getActionOverrides();
2210         }
2211
2212         /**
2213          * Call to WikiPage function for backwards compatibility.
2214          * @see WikiPage::getAutoDeleteReason
2215          */
2216         public function getAutoDeleteReason( &$hasHistory ) {
2217                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2218         }
2219
2220         /**
2221          * Call to WikiPage function for backwards compatibility.
2222          * @see WikiPage::getCategories
2223          */
2224         public function getCategories() {
2225                 return $this->mPage->getCategories();
2226         }
2227
2228         /**
2229          * Call to WikiPage function for backwards compatibility.
2230          * @see WikiPage::getComment
2231          */
2232         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2233                 return $this->mPage->getComment( $audience, $user );
2234         }
2235
2236         /**
2237          * Call to WikiPage function for backwards compatibility.
2238          * @see WikiPage::getContentHandler
2239          */
2240         public function getContentHandler() {
2241                 return $this->mPage->getContentHandler();
2242         }
2243
2244         /**
2245          * Call to WikiPage function for backwards compatibility.
2246          * @see WikiPage::getContentModel
2247          */
2248         public function getContentModel() {
2249                 return $this->mPage->getContentModel();
2250         }
2251
2252         /**
2253          * Call to WikiPage function for backwards compatibility.
2254          * @see WikiPage::getContributors
2255          */
2256         public function getContributors() {
2257                 return $this->mPage->getContributors();
2258         }
2259
2260         /**
2261          * Call to WikiPage function for backwards compatibility.
2262          * @see WikiPage::getCreator
2263          */
2264         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2265                 return $this->mPage->getCreator( $audience, $user );
2266         }
2267
2268         /**
2269          * Call to WikiPage function for backwards compatibility.
2270          * @see WikiPage::getDeletionUpdates
2271          */
2272         public function getDeletionUpdates( Content $content = null ) {
2273                 return $this->mPage->getDeletionUpdates( $content );
2274         }
2275
2276         /**
2277          * Call to WikiPage function for backwards compatibility.
2278          * @see WikiPage::getHiddenCategories
2279          */
2280         public function getHiddenCategories() {
2281                 return $this->mPage->getHiddenCategories();
2282         }
2283
2284         /**
2285          * Call to WikiPage function for backwards compatibility.
2286          * @see WikiPage::getId
2287          */
2288         public function getId() {
2289                 return $this->mPage->getId();
2290         }
2291
2292         /**
2293          * Call to WikiPage function for backwards compatibility.
2294          * @see WikiPage::getLatest
2295          */
2296         public function getLatest() {
2297                 return $this->mPage->getLatest();
2298         }
2299
2300         /**
2301          * Call to WikiPage function for backwards compatibility.
2302          * @see WikiPage::getLinksTimestamp
2303          */
2304         public function getLinksTimestamp() {
2305                 return $this->mPage->getLinksTimestamp();
2306         }
2307
2308         /**
2309          * Call to WikiPage function for backwards compatibility.
2310          * @see WikiPage::getMinorEdit
2311          */
2312         public function getMinorEdit() {
2313                 return $this->mPage->getMinorEdit();
2314         }
2315
2316         /**
2317          * Call to WikiPage function for backwards compatibility.
2318          * @see WikiPage::getOldestRevision
2319          */
2320         public function getOldestRevision() {
2321                 return $this->mPage->getOldestRevision();
2322         }
2323
2324         /**
2325          * Call to WikiPage function for backwards compatibility.
2326          * @see WikiPage::getRedirectTarget
2327          */
2328         public function getRedirectTarget() {
2329                 return $this->mPage->getRedirectTarget();
2330         }
2331
2332         /**
2333          * Call to WikiPage function for backwards compatibility.
2334          * @see WikiPage::getRedirectURL
2335          */
2336         public function getRedirectURL( $rt ) {
2337                 return $this->mPage->getRedirectURL( $rt );
2338         }
2339
2340         /**
2341          * Call to WikiPage function for backwards compatibility.
2342          * @see WikiPage::getRevision
2343          */
2344         public function getRevision() {
2345                 return $this->mPage->getRevision();
2346         }
2347
2348         /**
2349          * Call to WikiPage function for backwards compatibility.
2350          * @see WikiPage::getText
2351          */
2352         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2353                 ContentHandler::deprecated( __METHOD__, '1.21' );
2354                 return $this->mPage->getText( $audience, $user );
2355         }
2356
2357         /**
2358          * Call to WikiPage function for backwards compatibility.
2359          * @see WikiPage::getTimestamp
2360          */
2361         public function getTimestamp() {
2362                 return $this->mPage->getTimestamp();
2363         }
2364
2365         /**
2366          * Call to WikiPage function for backwards compatibility.
2367          * @see WikiPage::getTouched
2368          */
2369         public function getTouched() {
2370                 return $this->mPage->getTouched();
2371         }
2372
2373         /**
2374          * Call to WikiPage function for backwards compatibility.
2375          * @see WikiPage::getUndoContent
2376          */
2377         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2378                 return $this->mPage->getUndoContent( $undo, $undoafter );
2379         }
2380
2381         /**
2382          * Call to WikiPage function for backwards compatibility.
2383          * @see WikiPage::getUndoText
2384          */
2385         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
2386                 ContentHandler::deprecated( __METHOD__, '1.21' );
2387                 return $this->mPage->getUndoText( $undo, $undoafter );
2388         }
2389
2390         /**
2391          * Call to WikiPage function for backwards compatibility.
2392          * @see WikiPage::getUser
2393          */
2394         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2395                 return $this->mPage->getUser( $audience, $user );
2396         }
2397
2398         /**
2399          * Call to WikiPage function for backwards compatibility.
2400          * @see WikiPage::getUserText
2401          */
2402         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2403                 return $this->mPage->getUserText( $audience, $user );
2404         }
2405
2406         /**
2407          * Call to WikiPage function for backwards compatibility.
2408          * @see WikiPage::hasViewableContent
2409          */
2410         public function hasViewableContent() {
2411                 return $this->mPage->hasViewableContent();
2412         }
2413
2414         /**
2415          * Call to WikiPage function for backwards compatibility.
2416          * @see WikiPage::insertOn
2417          */
2418         public function insertOn( $dbw, $pageId = null ) {
2419                 return $this->mPage->insertOn( $dbw, $pageId );
2420         }
2421
2422         /**
2423          * Call to WikiPage function for backwards compatibility.
2424          * @see WikiPage::insertProtectNullRevision
2425          */
2426         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2427                 array $expiry, $cascade, $reason, $user = null
2428         ) {
2429                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2430                         $expiry, $cascade, $reason, $user
2431                 );
2432         }
2433
2434         /**
2435          * Call to WikiPage function for backwards compatibility.
2436          * @see WikiPage::insertRedirect
2437          */
2438         public function insertRedirect() {
2439                 return $this->mPage->insertRedirect();
2440         }
2441
2442         /**
2443          * Call to WikiPage function for backwards compatibility.
2444          * @see WikiPage::insertRedirectEntry
2445          */
2446         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2447                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2448         }
2449
2450         /**
2451          * Call to WikiPage function for backwards compatibility.
2452          * @see WikiPage::isCountable
2453          */
2454         public function isCountable( $editInfo = false ) {
2455                 return $this->mPage->isCountable( $editInfo );
2456         }
2457
2458         /**
2459          * Call to WikiPage function for backwards compatibility.
2460          * @see WikiPage::isRedirect
2461          */
2462         public function isRedirect() {
2463                 return $this->mPage->isRedirect();
2464         }
2465
2466         /**
2467          * Call to WikiPage function for backwards compatibility.
2468          * @see WikiPage::loadFromRow
2469          */
2470         public function loadFromRow( $data, $from ) {
2471                 return $this->mPage->loadFromRow( $data, $from );
2472         }
2473
2474         /**
2475          * Call to WikiPage function for backwards compatibility.
2476          * @see WikiPage::loadPageData
2477          */
2478         public function loadPageData( $from = 'fromdb' ) {
2479                 $this->mPage->loadPageData( $from );
2480         }
2481
2482         /**
2483          * Call to WikiPage function for backwards compatibility.
2484          * @see WikiPage::lockAndGetLatest
2485          */
2486         public function lockAndGetLatest() {
2487                 return $this->mPage->lockAndGetLatest();
2488         }
2489
2490         /**
2491          * Call to WikiPage function for backwards compatibility.
2492          * @see WikiPage::makeParserOptions
2493          */
2494         public function makeParserOptions( $context ) {
2495                 return $this->mPage->makeParserOptions( $context );
2496         }
2497
2498         /**
2499          * Call to WikiPage function for backwards compatibility.
2500          * @see WikiPage::pageDataFromId
2501          */
2502         public function pageDataFromId( $dbr, $id, $options = [] ) {
2503                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2504         }
2505
2506         /**
2507          * Call to WikiPage function for backwards compatibility.
2508          * @see WikiPage::pageDataFromTitle
2509          */
2510         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2511                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2512         }
2513
2514         /**
2515          * Call to WikiPage function for backwards compatibility.
2516          * @see WikiPage::prepareContentForEdit
2517          */
2518         public function prepareContentForEdit(
2519                 Content $content, $revision = null, User $user = null,
2520                 $serialFormat = null, $useCache = true
2521         ) {
2522                 return $this->mPage->prepareContentForEdit(
2523                         $content, $revision, $user,
2524                         $serialFormat, $useCache
2525                 );
2526         }
2527
2528         /**
2529          * Call to WikiPage function for backwards compatibility.
2530          * @see WikiPage::prepareTextForEdit
2531          */
2532         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2533                 return $this->mPage->prepareTextForEdit( $text, $revid, $user );
2534         }
2535
2536         /**
2537          * Call to WikiPage function for backwards compatibility.
2538          * @see WikiPage::protectDescription
2539          */
2540         public function protectDescription( array $limit, array $expiry ) {
2541                 return $this->mPage->protectDescription( $limit, $expiry );
2542         }
2543
2544         /**
2545          * Call to WikiPage function for backwards compatibility.
2546          * @see WikiPage::protectDescriptionLog
2547          */
2548         public function protectDescriptionLog( array $limit, array $expiry ) {
2549                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2550         }
2551
2552         /**
2553          * Call to WikiPage function for backwards compatibility.
2554          * @see WikiPage::replaceSection
2555          */
2556         public function replaceSection( $sectionId, $text, $sectionTitle = '',
2557                 $edittime = null
2558         ) {
2559                 ContentHandler::deprecated( __METHOD__, '1.21' );
2560                 return $this->mPage->replaceSection( $sectionId, $text, $sectionTitle,
2561                         $edittime
2562                 );
2563         }
2564
2565         /**
2566          * Call to WikiPage function for backwards compatibility.
2567          * @see WikiPage::replaceSectionAtRev
2568          */
2569         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2570                 $sectionTitle = '', $baseRevId = null
2571         ) {
2572                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2573                         $sectionTitle, $baseRevId
2574                 );
2575         }
2576
2577         /**
2578          * Call to WikiPage function for backwards compatibility.
2579          * @see WikiPage::replaceSectionContent
2580          */
2581         public function replaceSectionContent(
2582                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2583         ) {
2584                 return $this->mPage->replaceSectionContent(
2585                         $sectionId, $sectionContent, $sectionTitle, $edittime
2586                 );
2587         }
2588
2589         /**
2590          * Call to WikiPage function for backwards compatibility.
2591          * @see WikiPage::setTimestamp
2592          */
2593         public function setTimestamp( $ts ) {
2594                 return $this->mPage->setTimestamp( $ts );
2595         }
2596
2597         /**
2598          * Call to WikiPage function for backwards compatibility.
2599          * @see WikiPage::shouldCheckParserCache
2600          */
2601         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2602                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2603         }
2604
2605         /**
2606          * Call to WikiPage function for backwards compatibility.
2607          * @see WikiPage::supportsSections
2608          */
2609         public function supportsSections() {
2610                 return $this->mPage->supportsSections();
2611         }
2612
2613         /**
2614          * Call to WikiPage function for backwards compatibility.
2615          * @see WikiPage::triggerOpportunisticLinksUpdate
2616          */
2617         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2618                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2619         }
2620
2621         /**
2622          * Call to WikiPage function for backwards compatibility.
2623          * @see WikiPage::updateCategoryCounts
2624          */
2625         public function updateCategoryCounts( array $added, array $deleted ) {
2626                 return $this->mPage->updateCategoryCounts( $added, $deleted );
2627         }
2628
2629         /**
2630          * Call to WikiPage function for backwards compatibility.
2631          * @see WikiPage::updateIfNewerOn
2632          */
2633         public function updateIfNewerOn( $dbw, $revision ) {
2634                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2635         }
2636
2637         /**
2638          * Call to WikiPage function for backwards compatibility.
2639          * @see WikiPage::updateRedirectOn
2640          */
2641         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2642                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null );
2643         }
2644
2645         /**
2646          * Call to WikiPage function for backwards compatibility.
2647          * @see WikiPage::updateRevisionOn
2648          */
2649         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2650                 $lastRevIsRedirect = null
2651         ) {
2652                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2653                         $lastRevIsRedirect
2654                 );
2655         }
2656
2657         /**
2658          * @param array $limit
2659          * @param array $expiry
2660          * @param bool $cascade
2661          * @param string $reason
2662          * @param User $user
2663          * @return Status
2664          */
2665         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2666                 $reason, User $user
2667         ) {
2668                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2669         }
2670
2671         /**
2672          * @param array $limit
2673          * @param string $reason
2674          * @param int $cascade
2675          * @param array $expiry
2676          * @return bool
2677          */
2678         public function updateRestrictions( $limit = [], $reason = '',
2679                 &$cascade = 0, $expiry = []
2680         ) {
2681                 return $this->mPage->doUpdateRestrictions(
2682                         $limit,
2683                         $expiry,
2684                         $cascade,
2685                         $reason,
2686                         $this->getContext()->getUser()
2687                 );
2688         }
2689
2690         /**
2691          * @param string $reason
2692          * @param bool $suppress
2693          * @param int $u1 Unused
2694          * @param bool $u2 Unused
2695          * @param string $error
2696          * @return bool
2697          */
2698         public function doDeleteArticle(
2699                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = ''
2700         ) {
2701                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error );
2702         }
2703
2704         /**
2705          * @param string $fromP
2706          * @param string $summary
2707          * @param string $token
2708          * @param bool $bot
2709          * @param array $resultDetails
2710          * @param User|null $user
2711          * @return array
2712          */
2713         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2714                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2715                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2716         }
2717
2718         /**
2719          * @param string $fromP
2720          * @param string $summary
2721          * @param bool $bot
2722          * @param array $resultDetails
2723          * @param User|null $guser
2724          * @return array
2725          */
2726         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2727                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2728                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2729         }
2730
2731         /**
2732          * @param bool $hasHistory
2733          * @return mixed
2734          */
2735         public function generateReason( &$hasHistory ) {
2736                 $title = $this->mPage->getTitle();
2737                 $handler = ContentHandler::getForTitle( $title );
2738                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2739         }
2740
2741         /**
2742          * @return array
2743          *
2744          * @deprecated since 1.24, use WikiPage::selectFields() instead
2745          */
2746         public static function selectFields() {
2747                 wfDeprecated( __METHOD__, '1.24' );
2748                 return WikiPage::selectFields();
2749         }
2750
2751         /**
2752          * @param Title $title
2753          *
2754          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2755          */
2756         public static function onArticleCreate( $title ) {
2757                 wfDeprecated( __METHOD__, '1.24' );
2758                 WikiPage::onArticleCreate( $title );
2759         }
2760
2761         /**
2762          * @param Title $title
2763          *
2764          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2765          */
2766         public static function onArticleDelete( $title ) {
2767                 wfDeprecated( __METHOD__, '1.24' );
2768                 WikiPage::onArticleDelete( $title );
2769         }
2770
2771         /**
2772          * @param Title $title
2773          *
2774          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2775          */
2776         public static function onArticleEdit( $title ) {
2777                 wfDeprecated( __METHOD__, '1.24' );
2778                 WikiPage::onArticleEdit( $title );
2779         }
2780
2781         /**
2782          * @param string $oldtext
2783          * @param string $newtext
2784          * @param int $flags
2785          * @return string
2786          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2787          */
2788         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2789                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2790         }
2791         // ******
2792 }