includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use MediaWiki\MediaWikiServices;
  23
  24 /**
  25  * Class for viewing MediaWiki article and history.
  26  *
  27  * This maintains WikiPage functions for backwards compatibility.
  28  *
  29  * @todo Move and rewrite code to an Action class
  30  *
  31  * See design.txt for an overview.
  32  * Note: edit user interface and cache support functions have been
  33  * moved to separate EditPage and HTMLFileCache classes.
  34  */
  35 class Article implements Page {
  36         /** @var IContextSource The context this Article is executed in */
  37         protected $mContext;
  38
  39         /** @var WikiPage The WikiPage object of this instance */
  40         protected $mPage;
  41
  42         /** @var ParserOptions ParserOptions object for $wgUser articles */
  43         public $mParserOptions;
  44
  45         /**
  46          * @var string Text of the revision we are working on
  47          * @todo BC cruft
  48          */
  49         public $mContent;
  50
  51         /**
  52          * @var Content Content of the revision we are working on
  53          * @since 1.21
  54          */
  55         public $mContentObject;
  56
  57         /** @var bool Is the content ($mContent) already loaded? */
  58         public $mContentLoaded = false;
  59
  60         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  61         public $mOldId;
  62
  63         /** @var Title Title from which we were redirected here */
  64         public $mRedirectedFrom = null;
  65
  66         /** @var string|bool URL to redirect to or false if none */
  67         public $mRedirectUrl = false;
  68
  69         /** @var int Revision ID of revision we are working on */
  70         public $mRevIdFetched = 0;
  71
  72         /** @var Revision Revision we are working on */
  73         public $mRevision = null;
  74
  75         /** @var ParserOutput */
  76         public $mParserOutput;
  77
  78         /**
  79          * @var bool Whether render() was called. With the way subclasses work
  80          * here, there doesn't seem to be any other way to stop calling
  81          * OutputPage::enableSectionEditLinks() and still have it work as it did before.
  82          */
  83         private $disableSectionEditForRender = false;
  84
  85         /**
  86          * Constructor and clear the article
  87          * @param Title $title Reference to a Title object.
  88          * @param int|null $oldId Revision ID, null to fetch from request, zero for current
  89          */
  90         public function __construct( Title $title, $oldId = null ) {
  91                 $this->mOldId = $oldId;
  92                 $this->mPage = $this->newPage( $title );
  93         }
  94
  95         /**
  96          * @param Title $title
  97          * @return WikiPage
  98          */
  99         protected function newPage( Title $title ) {
 100                 return new WikiPage( $title );
 101         }
 102
 103         /**
 104          * Constructor from a page id
 105          * @param int $id Article ID to load
 106          * @return Article|null
 107          */
 108         public static function newFromID( $id ) {
 109                 $t = Title::newFromID( $id );
 110                 return $t == null ? null : new static( $t );
 111         }
 112
 113         /**
 114          * Create an Article object of the appropriate class for the given page.
 115          *
 116          * @param Title $title
 117          * @param IContextSource $context
 118          * @return Article
 119          */
 120         public static function newFromTitle( $title, IContextSource $context ) {
 121                 if ( NS_MEDIA == $title->getNamespace() ) {
 122                         // FIXME: where should this go?
 123                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 124                 }
 125
 126                 $page = null;
 127                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 128                 if ( !$page ) {
 129                         switch ( $title->getNamespace() ) {
 130                                 case NS_FILE:
 131                                         $page = new ImagePage( $title );
 132                                         break;
 133                                 case NS_CATEGORY:
 134                                         $page = new CategoryPage( $title );
 135                                         break;
 136                                 default:
 137                                         $page = new Article( $title );
 138                         }
 139                 }
 140                 $page->setContext( $context );
 141
 142                 return $page;
 143         }
 144
 145         /**
 146          * Create an Article object of the appropriate class for the given page.
 147          *
 148          * @param WikiPage $page
 149          * @param IContextSource $context
 150          * @return Article
 151          */
 152         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 153                 $article = self::newFromTitle( $page->getTitle(), $context );
 154                 $article->mPage = $page; // override to keep process cached vars
 155                 return $article;
 156         }
 157
 158         /**
 159          * Get the page this view was redirected from
 160          * @return Title|null
 161          * @since 1.28
 162          */
 163         public function getRedirectedFrom() {
 164                 return $this->mRedirectedFrom;
 165         }
 166
 167         /**
 168          * Tell the page view functions that this view was redirected
 169          * from another page on the wiki.
 170          * @param Title $from
 171          */
 172         public function setRedirectedFrom( Title $from ) {
 173                 $this->mRedirectedFrom = $from;
 174         }
 175
 176         /**
 177          * Get the title object of the article
 178          *
 179          * @return Title Title object of this page
 180          */
 181         public function getTitle() {
 182                 return $this->mPage->getTitle();
 183         }
 184
 185         /**
 186          * Get the WikiPage object of this instance
 187          *
 188          * @since 1.19
 189          * @return WikiPage
 190          */
 191         public function getPage() {
 192                 return $this->mPage;
 193         }
 194
 195         /**
 196          * Clear the object
 197          */
 198         public function clear() {
 199                 $this->mContentLoaded = false;
 200
 201                 $this->mRedirectedFrom = null; # Title object if set
 202                 $this->mRevIdFetched = 0;
 203                 $this->mRedirectUrl = false;
 204
 205                 $this->mPage->clear();
 206         }
 207
 208         /**
 209          * Returns a Content object representing the pages effective display content,
 210          * not necessarily the revision's content!
 211          *
 212          * Note that getContent does not follow redirects anymore.
 213          * If you need to fetch redirectable content easily, try
 214          * the shortcut in WikiPage::getRedirectTarget()
 215          *
 216          * This function has side effects! Do not use this function if you
 217          * only want the real revision text if any.
 218          *
 219          * @return Content Return the content of this revision
 220          *
 221          * @since 1.21
 222          */
 223         protected function getContentObject() {
 224                 if ( $this->mPage->getId() === 0 ) {
 225                         # If this is a MediaWiki:x message, then load the messages
 226                         # and return the message value for x.
 227                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 228                                 $text = $this->getTitle()->getDefaultMessageText();
 229                                 if ( $text === false ) {
 230                                         $text = '';
 231                                 }
 232
 233                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 234                         } else {
 235                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 236                                 $content = new MessageContent( $message, null, 'parsemag' );
 237                         }
 238                 } else {
 239                         $this->fetchContentObject();
 240                         $content = $this->mContentObject;
 241                 }
 242
 243                 return $content;
 244         }
 245
 246         /**
 247          * @return int The oldid of the article that is to be shown, 0 for the current revision
 248          */
 249         public function getOldID() {
 250                 if ( is_null( $this->mOldId ) ) {
 251                         $this->mOldId = $this->getOldIDFromRequest();
 252                 }
 253
 254                 return $this->mOldId;
 255         }
 256
 257         /**
 258          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 259          *
 260          * @return int The old id for the request
 261          */
 262         public function getOldIDFromRequest() {
 263                 $this->mRedirectUrl = false;
 264
 265                 $request = $this->getContext()->getRequest();
 266                 $oldid = $request->getIntOrNull( 'oldid' );
 267
 268                 if ( $oldid === null ) {
 269                         return 0;
 270                 }
 271
 272                 if ( $oldid !== 0 ) {
 273                         # Load the given revision and check whether the page is another one.
 274                         # In that case, update this instance to reflect the change.
 275                         if ( $oldid === $this->mPage->getLatest() ) {
 276                                 $this->mRevision = $this->mPage->getRevision();
 277                         } else {
 278                                 $this->mRevision = Revision::newFromId( $oldid );
 279                                 if ( $this->mRevision !== null ) {
 280                                         // Revision title doesn't match the page title given?
 281                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 282                                                 $function = get_class( $this->mPage ). '::newFromID';
 283                                                 $this->mPage = $function( $this->mRevision->getPage() );
 284                                         }
 285                                 }
 286                         }
 287                 }
 288
 289                 if ( $request->getVal( 'direction' ) == 'next' ) {
 290                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 291                         if ( $nextid ) {
 292                                 $oldid = $nextid;
 293                                 $this->mRevision = null;
 294                         } else {
 295                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 296                         }
 297                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 298                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 299                         if ( $previd ) {
 300                                 $oldid = $previd;
 301                                 $this->mRevision = null;
 302                         }
 303                 }
 304
 305                 return $oldid;
 306         }
 307
 308         /**
 309          * Get text content object
 310          * Does *NOT* follow redirects.
 311          * @todo When is this null?
 312          *
 313          * @note Code that wants to retrieve page content from the database should
 314          * use WikiPage::getContent().
 315          *
 316          * @return Content|null|bool
 317          *
 318          * @since 1.21
 319          */
 320         protected function fetchContentObject() {
 321                 if ( $this->mContentLoaded ) {
 322                         return $this->mContentObject;
 323                 }
 324
 325                 $this->mContentLoaded = true;
 326                 $this->mContent = null;
 327
 328                 $oldid = $this->getOldID();
 329
 330                 # Pre-fill content with error message so that if something
 331                 # fails we'll have something telling us what we intended.
 332                 // XXX: this isn't page content but a UI message. horrible.
 333                 $this->mContentObject = new MessageContent( 'missing-revision', [ $oldid ] );
 334
 335                 if ( $oldid ) {
 336                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 337                         if ( !$this->mRevision ) {
 338                                 $this->mRevision = Revision::newFromId( $oldid );
 339                                 if ( !$this->mRevision ) {
 340                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 341                                         return false;
 342                                 }
 343                         }
 344                 } else {
 345                         $oldid = $this->mPage->getLatest();
 346                         if ( !$oldid ) {
 347                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 348                                         $this->getTitle()->getPrefixedText() . "\n" );
 349                                 return false;
 350                         }
 351
 352                         # Update error message with correct oldid
 353                         $this->mContentObject = new MessageContent( 'missing-revision', [ $oldid ] );
 354
 355                         $this->mRevision = $this->mPage->getRevision();
 356
 357                         if ( !$this->mRevision ) {
 358                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id $oldid\n" );
 359                                 return false;
 360                         }
 361                 }
 362
 363                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 364                 // We should instead work with the Revision object when we need it...
 365                 // Loads if user is allowed
 366                 $content = $this->mRevision->getContent(
 367                         Revision::FOR_THIS_USER,
 368                         $this->getContext()->getUser()
 369                 );
 370
 371                 if ( !$content ) {
 372                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 373                                 $this->mRevision->getId() . "\n" );
 374                         return false;
 375                 }
 376
 377                 $this->mContentObject = $content;
 378                 $this->mRevIdFetched = $this->mRevision->getId();
 379
 380                 // Avoid PHP 7.1 warning of passing $this by reference
 381                 $articlePage = $this;
 382
 383                 Hooks::run(
 384                         'ArticleAfterFetchContentObject',
 385                         [ &$articlePage, &$this->mContentObject ]
 386                 );
 387
 388                 return $this->mContentObject;
 389         }
 390
 391         /**
 392          * Returns true if the currently-referenced revision is the current edit
 393          * to this page (and it exists).
 394          * @return bool
 395          */
 396         public function isCurrent() {
 397                 # If no oldid, this is the current version.
 398                 if ( $this->getOldID() == 0 ) {
 399                         return true;
 400                 }
 401
 402                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 403         }
 404
 405         /**
 406          * Get the fetched Revision object depending on request parameters or null
 407          * on failure.
 408          *
 409          * @since 1.19
 410          * @return Revision|null
 411          */
 412         public function getRevisionFetched() {
 413                 $this->fetchContentObject();
 414
 415                 return $this->mRevision;
 416         }
 417
 418         /**
 419          * Use this to fetch the rev ID used on page views
 420          *
 421          * @return int Revision ID of last article revision
 422          */
 423         public function getRevIdFetched() {
 424                 if ( $this->mRevIdFetched ) {
 425                         return $this->mRevIdFetched;
 426                 } else {
 427                         return $this->mPage->getLatest();
 428                 }
 429         }
 430
 431         /**
 432          * This is the default action of the index.php entry point: just view the
 433          * page of the given title.
 434          */
 435         public function view() {
 436                 global $wgUseFileCache, $wgDebugToolbar;
 437
 438                 # Get variables from query string
 439                 # As side effect this will load the revision and update the title
 440                 # in a revision ID is passed in the request, so this should remain
 441                 # the first call of this method even if $oldid is used way below.
 442                 $oldid = $this->getOldID();
 443
 444                 $user = $this->getContext()->getUser();
 445                 # Another whitelist check in case getOldID() is altering the title
 446                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 447                 if ( count( $permErrors ) ) {
 448                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 449                         throw new PermissionsError( 'read', $permErrors );
 450                 }
 451
 452                 $outputPage = $this->getContext()->getOutput();
 453                 # getOldID() may as well want us to redirect somewhere else
 454                 if ( $this->mRedirectUrl ) {
 455                         $outputPage->redirect( $this->mRedirectUrl );
 456                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 457
 458                         return;
 459                 }
 460
 461                 # If we got diff in the query, we want to see a diff page instead of the article.
 462                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 463                         wfDebug( __METHOD__ . ": showing diff page\n" );
 464                         $this->showDiffPage();
 465
 466                         return;
 467                 }
 468
 469                 # Set page title (may be overridden by DISPLAYTITLE)
 470                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 471
 472                 $outputPage->setArticleFlag( true );
 473                 # Allow frames by default
 474                 $outputPage->allowClickjacking();
 475
 476                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 477
 478                 $parserOptions = $this->getParserOptions();
 479                 $poOptions = [];
 480                 # Render printable version, use printable version cache
 481                 if ( $outputPage->isPrintable() ) {
 482                         $parserOptions->setIsPrintable( true );
 483                         $poOptions['enableSectionEditLinks'] = false;
 484                 } elseif ( $this->disableSectionEditForRender
 485                         || !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user )
 486                 ) {
 487                         $poOptions['enableSectionEditLinks'] = false;
 488                 }
 489
 490                 # Try client and file cache
 491                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 492                         # Try to stream the output from file cache
 493                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 494                                 wfDebug( __METHOD__ . ": done file cache\n" );
 495                                 # tell wgOut that output is taken care of
 496                                 $outputPage->disable();
 497                                 $this->mPage->doViewUpdates( $user, $oldid );
 498
 499                                 return;
 500                         }
 501                 }
 502
 503                 # Should the parser cache be used?
 504                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 505                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 506                 if ( $user->getStubThreshold() ) {
 507                         MediaWikiServices::getInstance()->getStatsdDataFactory()->increment( 'pcache_miss_stub' );
 508                 }
 509
 510                 $this->showRedirectedFromHeader();
 511                 $this->showNamespaceHeader();
 512
 513                 # Iterate through the possible ways of constructing the output text.
 514                 # Keep going until $outputDone is set, or we run out of things to do.
 515                 $pass = 0;
 516                 $outputDone = false;
 517                 $this->mParserOutput = false;
 518
 519                 while ( !$outputDone && ++$pass ) {
 520                         switch ( $pass ) {
 521                                 case 1:
 522                                         // Avoid PHP 7.1 warning of passing $this by reference
 523                                         $articlePage = $this;
 524                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 525                                         break;
 526                                 case 2:
 527                                         # Early abort if the page doesn't exist
 528                                         if ( !$this->mPage->exists() ) {
 529                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 530                                                 $this->showMissingArticle();
 531                                                 $this->mPage->doViewUpdates( $user );
 532                                                 return;
 533                                         }
 534
 535                                         # Try the parser cache
 536                                         if ( $useParserCache ) {
 537                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 538
 539                                                 if ( $this->mParserOutput !== false ) {
 540                                                         if ( $oldid ) {
 541                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 542                                                                 $this->setOldSubtitle( $oldid );
 543                                                         } else {
 544                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 545                                                         }
 546                                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 547                                                         # Ensure that UI elements requiring revision ID have
 548                                                         # the correct version information.
 549                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 550                                                         # Preload timestamp to avoid a DB hit
 551                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 552                                                         if ( $cachedTimestamp !== null ) {
 553                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 554                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 555                                                         }
 556                                                         $outputDone = true;
 557                                                 }
 558                                         }
 559                                         break;
 560                                 case 3:
 561                                         # This will set $this->mRevision if needed
 562                                         $this->fetchContentObject();
 563
 564                                         # Are we looking at an old revision
 565                                         if ( $oldid && $this->mRevision ) {
 566                                                 $this->setOldSubtitle( $oldid );
 567
 568                                                 if ( !$this->showDeletedRevisionHeader() ) {
 569                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 570                                                         return;
 571                                                 }
 572                                         }
 573
 574                                         # Ensure that UI elements requiring revision ID have
 575                                         # the correct version information.
 576                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 577                                         # Preload timestamp to avoid a DB hit
 578                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 579
 580                                         # Pages containing custom CSS or JavaScript get special treatment
 581                                         if ( $this->getTitle()->isSiteConfigPage() || $this->getTitle()->isUserConfigPage() ) {
 582                                                 $dir = $this->getContext()->getLanguage()->getDir();
 583                                                 $lang = $this->getContext()->getLanguage()->getHtmlCode();
 584
 585                                                 $outputPage->wrapWikiMsg(
 586                                                         "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 587                                                         'clearyourcache'
 588                                                 );
 589                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 590                                                 [ $this->fetchContentObject(), $this->getTitle(), $outputPage ] )
 591                                         ) {
 592                                                 # Allow extensions do their own custom view for certain pages
 593                                                 $outputDone = true;
 594                                         }
 595                                         break;
 596                                 case 4:
 597                                         # Run the parse, protected by a pool counter
 598                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 599
 600                                         $content = $this->getContentObject();
 601                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 602                                                 $this->getRevIdFetched(), $useParserCache, $content );
 603
 604                                         if ( !$poolArticleView->execute() ) {
 605                                                 $error = $poolArticleView->getError();
 606                                                 if ( $error ) {
 607                                                         $outputPage->clearHTML(); // for release() errors
 608                                                         $outputPage->enableClientCache( false );
 609                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 610
 611                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 612                                                         $outputPage->addWikiText( Html::errorBox( $errortext ) );
 613                                                 }
 614                                                 # Connection or timeout error
 615                                                 return;
 616                                         }
 617
 618                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 619                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 620                                         if ( $content->getRedirectTarget() ) {
 621                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 622                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 623                                         }
 624
 625                                         # Don't cache a dirty ParserOutput object
 626                                         if ( $poolArticleView->getIsDirty() ) {
 627                                                 $outputPage->setCdnMaxage( 0 );
 628                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 629                                                         "sending anyway due to pool overload-->\n" );
 630                                         }
 631
 632                                         $outputDone = true;
 633                                         break;
 634                                 # Should be unreachable, but just in case...
 635                                 default:
 636                                         break 2;
 637                         }
 638                 }
 639
 640                 # Get the ParserOutput actually *displayed* here.
 641                 # Note that $this->mParserOutput is the *current*/oldid version output.
 642                 $pOutput = ( $outputDone instanceof ParserOutput )
 643                         ? $outputDone // object fetched by hook
 644                         : $this->mParserOutput;
 645
 646                 # Adjust title for main page & pages with displaytitle
 647                 if ( $pOutput ) {
 648                         $this->adjustDisplayTitle( $pOutput );
 649                 }
 650
 651                 # For the main page, overwrite the <title> element with the con-
 652                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 653                 # that's not empty).
 654                 # This message always exists because it is in the i18n files
 655                 if ( $this->getTitle()->isMainPage() ) {
 656                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 657                         if ( !$msg->isDisabled() ) {
 658                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 659                         }
 660                 }
 661
 662                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 663                 # This could use getTouched(), but that could be scary for major template edits.
 664                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 665
 666                 # Check for any __NOINDEX__ tags on the page using $pOutput
 667                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 668                 $outputPage->setIndexPolicy( $policy['index'] );
 669                 $outputPage->setFollowPolicy( $policy['follow'] );
 670
 671                 $this->showViewFooter();
 672                 $this->mPage->doViewUpdates( $user, $oldid );
 673
 674                 # Load the postEdit module if the user just saved this revision
 675                 # See also EditPage::setPostEditCookie
 676                 $request = $this->getContext()->getRequest();
 677                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 678                 $postEdit = $request->getCookie( $cookieKey );
 679                 if ( $postEdit ) {
 680                         # Clear the cookie. This also prevents caching of the response.
 681                         $request->response()->clearCookie( $cookieKey );
 682                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 683                         $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 684                 }
 685         }
 686
 687         /**
 688          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 689          * @param ParserOutput $pOutput
 690          */
 691         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 692                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 693                 $titleText = $pOutput->getTitleText();
 694                 if ( strval( $titleText ) !== '' ) {
 695                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 696                 }
 697         }
 698
 699         /**
 700          * Show a diff page according to current request variables. For use within
 701          * Article::view() only, other callers should use the DifferenceEngine class.
 702          */
 703         protected function showDiffPage() {
 704                 $request = $this->getContext()->getRequest();
 705                 $user = $this->getContext()->getUser();
 706                 $diff = $request->getVal( 'diff' );
 707                 $rcid = $request->getVal( 'rcid' );
 708                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 709                 $purge = $request->getVal( 'action' ) == 'purge';
 710                 $unhide = $request->getInt( 'unhide' ) == 1;
 711                 $oldid = $this->getOldID();
 712
 713                 $rev = $this->getRevisionFetched();
 714
 715                 if ( !$rev ) {
 716                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 717                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 718                                 ->params( $oldid )
 719                                 ->numParams( 1 )
 720                                 ->parseAsBlock();
 721                         $this->getContext()->getOutput()->addHTML( $msg );
 722                         return;
 723                 }
 724
 725                 $contentHandler = $rev->getContentHandler();
 726                 $de = $contentHandler->createDifferenceEngine(
 727                         $this->getContext(),
 728                         $oldid,
 729                         $diff,
 730                         $rcid,
 731                         $purge,
 732                         $unhide
 733                 );
 734
 735                 // DifferenceEngine directly fetched the revision:
 736                 $this->mRevIdFetched = $de->getNewid();
 737                 $de->showDiffPage( $diffOnly );
 738
 739                 // Run view updates for the newer revision being diffed (and shown
 740                 // below the diff if not $diffOnly).
 741                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 742                 // New can be false, convert it to 0 - this conveniently means the latest revision
 743                 $this->mPage->doViewUpdates( $user, (int)$new );
 744         }
 745
 746         /**
 747          * Get the robot policy to be used for the current view
 748          * @param string $action The action= GET parameter
 749          * @param ParserOutput|null $pOutput
 750          * @return array The policy that should be set
 751          * @todo actions other than 'view'
 752          */
 753         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 754                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 755
 756                 $ns = $this->getTitle()->getNamespace();
 757
 758                 # Don't index user and user talk pages for blocked users (T13443)
 759                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 760                         $specificTarget = null;
 761                         $vagueTarget = null;
 762                         $titleText = $this->getTitle()->getText();
 763                         if ( IP::isValid( $titleText ) ) {
 764                                 $vagueTarget = $titleText;
 765                         } else {
 766                                 $specificTarget = $titleText;
 767                         }
 768                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 769                                 return [
 770                                         'index' => 'noindex',
 771                                         'follow' => 'nofollow'
 772                                 ];
 773                         }
 774                 }
 775
 776                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 777                         # Non-articles (special pages etc), and old revisions
 778                         return [
 779                                 'index' => 'noindex',
 780                                 'follow' => 'nofollow'
 781                         ];
 782                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 783                         # Discourage indexing of printable versions, but encourage following
 784                         return [
 785                                 'index' => 'noindex',
 786                                 'follow' => 'follow'
 787                         ];
 788                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 789                         # For ?curid=x urls, disallow indexing
 790                         return [
 791                                 'index' => 'noindex',
 792                                 'follow' => 'follow'
 793                         ];
 794                 }
 795
 796                 # Otherwise, construct the policy based on the various config variables.
 797                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 798
 799                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 800                         # Honour customised robot policies for this namespace
 801                         $policy = array_merge(
 802                                 $policy,
 803                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 804                         );
 805                 }
 806                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 807                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 808                         # a final sanity check that we have really got the parser output.
 809                         $policy = array_merge(
 810                                 $policy,
 811                                 [ 'index' => $pOutput->getIndexPolicy() ]
 812                         );
 813                 }
 814
 815                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 816                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
 817                         $policy = array_merge(
 818                                 $policy,
 819                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 820                         );
 821                 }
 822
 823                 return $policy;
 824         }
 825
 826         /**
 827          * Converts a String robot policy into an associative array, to allow
 828          * merging of several policies using array_merge().
 829          * @param array|string $policy Returns empty array on null/false/'', transparent
 830          *   to already-converted arrays, converts string.
 831          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 832          */
 833         public static function formatRobotPolicy( $policy ) {
 834                 if ( is_array( $policy ) ) {
 835                         return $policy;
 836                 } elseif ( !$policy ) {
 837                         return [];
 838                 }
 839
 840                 $policy = explode( ',', $policy );
 841                 $policy = array_map( 'trim', $policy );
 842
 843                 $arr = [];
 844                 foreach ( $policy as $var ) {
 845                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
 846                                 $arr['index'] = $var;
 847                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
 848                                 $arr['follow'] = $var;
 849                         }
 850                 }
 851
 852                 return $arr;
 853         }
 854
 855         /**
 856          * If this request is a redirect view, send "redirected from" subtitle to
 857          * the output. Returns true if the header was needed, false if this is not
 858          * a redirect view. Handles both local and remote redirects.
 859          *
 860          * @return bool
 861          */
 862         public function showRedirectedFromHeader() {
 863                 global $wgRedirectSources;
 864
 865                 $context = $this->getContext();
 866                 $outputPage = $context->getOutput();
 867                 $request = $context->getRequest();
 868                 $rdfrom = $request->getVal( 'rdfrom' );
 869
 870                 // Construct a URL for the current page view, but with the target title
 871                 $query = $request->getValues();
 872                 unset( $query['rdfrom'] );
 873                 unset( $query['title'] );
 874                 if ( $this->getTitle()->isRedirect() ) {
 875                         // Prevent double redirects
 876                         $query['redirect'] = 'no';
 877                 }
 878                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 879
 880                 if ( isset( $this->mRedirectedFrom ) ) {
 881                         // Avoid PHP 7.1 warning of passing $this by reference
 882                         $articlePage = $this;
 883
 884                         // This is an internally redirected page view.
 885                         // We'll need a backlink to the source page for navigation.
 886                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
 887                                 $redir = Linker::linkKnown(
 888                                         $this->mRedirectedFrom,
 889                                         null,
 890                                         [],
 891                                         [ 'redirect' => 'no' ]
 892                                 );
 893
 894                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 895                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 896                                 . "</span>" );
 897
 898                                 // Add the script to update the displayed URL and
 899                                 // set the fragment if one was specified in the redirect
 900                                 $outputPage->addJsConfigVars( [
 901                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 902                                 ] );
 903                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 904
 905                                 // Add a <link rel="canonical"> tag
 906                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
 907
 908                                 // Tell the output object that the user arrived at this article through a redirect
 909                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 910
 911                                 return true;
 912                         }
 913                 } elseif ( $rdfrom ) {
 914                         // This is an externally redirected view, from some other wiki.
 915                         // If it was reported from a trusted site, supply a backlink.
 916                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 917                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 918                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 919                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
 920                                 . "</span>" );
 921
 922                                 // Add the script to update the displayed URL
 923                                 $outputPage->addJsConfigVars( [
 924                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 925                                 ] );
 926                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 927
 928                                 return true;
 929                         }
 930                 }
 931
 932                 return false;
 933         }
 934
 935         /**
 936          * Show a header specific to the namespace currently being viewed, like
 937          * [[MediaWiki:Talkpagetext]]. For Article::view().
 938          */
 939         public function showNamespaceHeader() {
 940                 if ( $this->getTitle()->isTalkPage() ) {
 941                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 942                                 $this->getContext()->getOutput()->wrapWikiMsg(
 943                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
 944                                         [ 'talkpageheader' ]
 945                                 );
 946                         }
 947                 }
 948         }
 949
 950         /**
 951          * Show the footer section of an ordinary page view
 952          */
 953         public function showViewFooter() {
 954                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 955                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
 956                         && IP::isValid( $this->getTitle()->getText() )
 957                 ) {
 958                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
 959                 }
 960
 961                 // Show a footer allowing the user to patrol the shown revision or page if possible
 962                 $patrolFooterShown = $this->showPatrolFooter();
 963
 964                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
 965         }
 966
 967         /**
 968          * If patrol is possible, output a patrol UI box. This is called from the
 969          * footer section of ordinary page views. If patrol is not possible or not
 970          * desired, does nothing.
 971          * Side effect: When the patrol link is build, this method will call
 972          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
 973          *
 974          * @return bool
 975          */
 976         public function showPatrolFooter() {
 977                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
 978
 979                 // Allow hooks to decide whether to not output this at all
 980                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
 981                         return false;
 982                 }
 983
 984                 $outputPage = $this->getContext()->getOutput();
 985                 $user = $this->getContext()->getUser();
 986                 $title = $this->getTitle();
 987                 $rc = false;
 988
 989                 if ( !$title->quickUserCan( 'patrol', $user )
 990                         || !( $wgUseRCPatrol || $wgUseNPPatrol
 991                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
 992                 ) {
 993                         // Patrolling is disabled or the user isn't allowed to
 994                         return false;
 995                 }
 996
 997                 if ( $this->mRevision
 998                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
 999                 ) {
1000                         // The current revision is already older than what could be in the RC table
1001                         // 6h tolerance because the RC might not be cleaned out regularly
1002                         return false;
1003                 }
1004
1005                 // Check for cached results
1006                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1007                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1008                 if ( $cache->get( $key ) ) {
1009                         return false;
1010                 }
1011
1012                 $dbr = wfGetDB( DB_REPLICA );
1013                 $oldestRevisionTimestamp = $dbr->selectField(
1014                         'revision',
1015                         'MIN( rev_timestamp )',
1016                         [ 'rev_page' => $title->getArticleID() ],
1017                         __METHOD__
1018                 );
1019
1020                 // New page patrol: Get the timestamp of the oldest revison which
1021                 // the revision table holds for the given page. Then we look
1022                 // whether it's within the RC lifespan and if it is, we try
1023                 // to get the recentchanges row belonging to that entry
1024                 // (with rc_new = 1).
1025                 $recentPageCreation = false;
1026                 if ( $oldestRevisionTimestamp
1027                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1028                 ) {
1029                         // 6h tolerance because the RC might not be cleaned out regularly
1030                         $recentPageCreation = true;
1031                         $rc = RecentChange::newFromConds(
1032                                 [
1033                                         'rc_new' => 1,
1034                                         'rc_timestamp' => $oldestRevisionTimestamp,
1035                                         'rc_namespace' => $title->getNamespace(),
1036                                         'rc_cur_id' => $title->getArticleID()
1037                                 ],
1038                                 __METHOD__
1039                         );
1040                         if ( $rc ) {
1041                                 // Use generic patrol message for new pages
1042                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1043                         }
1044                 }
1045
1046                 // File patrol: Get the timestamp of the latest upload for this page,
1047                 // check whether it is within the RC lifespan and if it is, we try
1048                 // to get the recentchanges row belonging to that entry
1049                 // (with rc_type = RC_LOG, rc_log_type = upload).
1050                 $recentFileUpload = false;
1051                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1052                         && $title->getNamespace() === NS_FILE ) {
1053                         // Retrieve timestamp of most recent upload
1054                         $newestUploadTimestamp = $dbr->selectField(
1055                                 'image',
1056                                 'MAX( img_timestamp )',
1057                                 [ 'img_name' => $title->getDBkey() ],
1058                                 __METHOD__
1059                         );
1060                         if ( $newestUploadTimestamp
1061                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1062                         ) {
1063                                 // 6h tolerance because the RC might not be cleaned out regularly
1064                                 $recentFileUpload = true;
1065                                 $rc = RecentChange::newFromConds(
1066                                         [
1067                                                 'rc_type' => RC_LOG,
1068                                                 'rc_log_type' => 'upload',
1069                                                 'rc_timestamp' => $newestUploadTimestamp,
1070                                                 'rc_namespace' => NS_FILE,
1071                                                 'rc_cur_id' => $title->getArticleID()
1072                                         ],
1073                                         __METHOD__
1074                                 );
1075                                 if ( $rc ) {
1076                                         // Use patrol message specific to files
1077                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1078                                 }
1079                         }
1080                 }
1081
1082                 if ( !$recentPageCreation && !$recentFileUpload ) {
1083                         // Page creation and latest upload (for files) is too old to be in RC
1084
1085                         // We definitely can't patrol so cache the information
1086                         // When a new file version is uploaded, the cache is cleared
1087                         $cache->set( $key, '1' );
1088
1089                         return false;
1090                 }
1091
1092                 if ( !$rc ) {
1093                         // Don't cache: This can be hit if the page gets accessed very fast after
1094                         // its creation / latest upload or in case we have high replica DB lag. In case
1095                         // the revision is too old, we will already return above.
1096                         return false;
1097                 }
1098
1099                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1100                         // Patrolled RC entry around
1101
1102                         // Cache the information we gathered above in case we can't patrol
1103                         // Don't cache in case we can patrol as this could change
1104                         $cache->set( $key, '1' );
1105
1106                         return false;
1107                 }
1108
1109                 if ( $rc->getPerformer()->equals( $user ) ) {
1110                         // Don't show a patrol link for own creations/uploads. If the user could
1111                         // patrol them, they already would be patrolled
1112                         return false;
1113                 }
1114
1115                 $outputPage->preventClickjacking();
1116                 if ( $user->isAllowed( 'writeapi' ) ) {
1117                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1118                 }
1119
1120                 $link = Linker::linkKnown(
1121                         $title,
1122                         $markPatrolledMsg->escaped(),
1123                         [],
1124                         [
1125                                 'action' => 'markpatrolled',
1126                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1127                         ]
1128                 );
1129
1130                 $outputPage->addHTML(
1131                         "<div class='patrollink' data-mw='interface'>" .
1132                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1133                         '</div>'
1134                 );
1135
1136                 return true;
1137         }
1138
1139         /**
1140          * Purge the cache used to check if it is worth showing the patrol footer
1141          * For example, it is done during re-uploads when file patrol is used.
1142          * @param int $articleID ID of the article to purge
1143          * @since 1.27
1144          */
1145         public static function purgePatrolFooterCache( $articleID ) {
1146                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1147                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1148         }
1149
1150         /**
1151          * Show the error text for a missing article. For articles in the MediaWiki
1152          * namespace, show the default message text. To be called from Article::view().
1153          */
1154         public function showMissingArticle() {
1155                 global $wgSend404Code;
1156
1157                 $outputPage = $this->getContext()->getOutput();
1158                 // Whether the page is a root user page of an existing user (but not a subpage)
1159                 $validUserPage = false;
1160
1161                 $title = $this->getTitle();
1162
1163                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1164                 if ( $title->getNamespace() == NS_USER
1165                         || $title->getNamespace() == NS_USER_TALK
1166                 ) {
1167                         $rootPart = explode( '/', $title->getText() )[0];
1168                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1169                         $ip = User::isIP( $rootPart );
1170                         $block = Block::newFromTarget( $user, $user );
1171
1172                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1173                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1174                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1175                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1176                                 # Show log extract if the user is currently blocked
1177                                 LogEventsList::showLogExtract(
1178                                         $outputPage,
1179                                         'block',
1180                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1181                                         '',
1182                                         [
1183                                                 'lim' => 1,
1184                                                 'showIfEmpty' => false,
1185                                                 'msgKey' => [
1186                                                         'blocked-notice-logextract',
1187                                                         $user->getName() # Support GENDER in notice
1188                                                 ]
1189                                         ]
1190                                 );
1191                                 $validUserPage = !$title->isSubpage();
1192                         } else {
1193                                 $validUserPage = !$title->isSubpage();
1194                         }
1195                 }
1196
1197                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1198
1199                 # Show delete and move logs if there were any such events.
1200                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1201                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1202                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
1203                 $key = $cache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1204                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1205                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1206                 if ( $loggedIn || $cache->get( $key ) || $sessionExists ) {
1207                         $logTypes = [ 'delete', 'move', 'protect' ];
1208
1209                         $dbr = wfGetDB( DB_REPLICA );
1210
1211                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1212                         // Give extensions a chance to hide their (unrelated) log entries
1213                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1214                         LogEventsList::showLogExtract(
1215                                 $outputPage,
1216                                 $logTypes,
1217                                 $title,
1218                                 '',
1219                                 [
1220                                         'lim' => 10,
1221                                         'conds' => $conds,
1222                                         'showIfEmpty' => false,
1223                                         'msgKey' => [ $loggedIn || $sessionExists
1224                                                 ? 'moveddeleted-notice'
1225                                                 : 'moveddeleted-notice-recent'
1226                                         ]
1227                                 ]
1228                         );
1229                 }
1230
1231                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1232                         // If there's no backing content, send a 404 Not Found
1233                         // for better machine handling of broken links.
1234                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1235                 }
1236
1237                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1238                 $policy = $this->getRobotPolicy( 'view' );
1239                 $outputPage->setIndexPolicy( $policy['index'] );
1240                 $outputPage->setFollowPolicy( $policy['follow'] );
1241
1242                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1243
1244                 if ( !$hookResult ) {
1245                         return;
1246                 }
1247
1248                 # Show error message
1249                 $oldid = $this->getOldID();
1250                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1251                         $outputPage->addParserOutput( $this->getContentObject()->getParserOutput( $title ) );
1252                 } else {
1253                         if ( $oldid ) {
1254                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1255                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1256                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1257                         ) {
1258                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1259                                 $text = wfMessage( $message )->plain();
1260                         } else {
1261                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1262                         }
1263
1264                         $dir = $this->getContext()->getLanguage()->getDir();
1265                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1266                         $outputPage->addWikiText( Xml::openElement( 'div', [
1267                                 'class' => "noarticletext mw-content-$dir",
1268                                 'dir' => $dir,
1269                                 'lang' => $lang,
1270                         ] ) . "\n$text\n</div>" );
1271                 }
1272         }
1273
1274         /**
1275          * If the revision requested for view is deleted, check permissions.
1276          * Send either an error message or a warning header to the output.
1277          *
1278          * @return bool True if the view is allowed, false if not.
1279          */
1280         public function showDeletedRevisionHeader() {
1281                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1282                         // Not deleted
1283                         return true;
1284                 }
1285
1286                 $outputPage = $this->getContext()->getOutput();
1287                 $user = $this->getContext()->getUser();
1288                 // If the user is not allowed to see it...
1289                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1290                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1291                                 'rev-deleted-text-permission' );
1292
1293                         return false;
1294                 // If the user needs to confirm that they want to see it...
1295                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1296                         # Give explanation and add a link to view the revision...
1297                         $oldid = intval( $this->getOldID() );
1298                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1299                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1300                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1301                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1302                                 [ $msg, $link ] );
1303
1304                         return false;
1305                 // We are allowed to see...
1306                 } else {
1307                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1308                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1309                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1310
1311                         return true;
1312                 }
1313         }
1314
1315         /**
1316          * Generate the navigation links when browsing through an article revisions
1317          * It shows the information as:
1318          *   Revision as of \<date\>; view current revision
1319          *   \<- Previous version | Next Version -\>
1320          *
1321          * @param int $oldid Revision ID of this article revision
1322          */
1323         public function setOldSubtitle( $oldid = 0 ) {
1324                 // Avoid PHP 7.1 warning of passing $this by reference
1325                 $articlePage = $this;
1326
1327                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1328                         return;
1329                 }
1330
1331                 $context = $this->getContext();
1332                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1333
1334                 # Cascade unhide param in links for easy deletion browsing
1335                 $extraParams = [];
1336                 if ( $unhide ) {
1337                         $extraParams['unhide'] = 1;
1338                 }
1339
1340                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1341                         $revision = $this->mRevision;
1342                 } else {
1343                         $revision = Revision::newFromId( $oldid );
1344                 }
1345
1346                 $timestamp = $revision->getTimestamp();
1347
1348                 $current = ( $oldid == $this->mPage->getLatest() );
1349                 $language = $context->getLanguage();
1350                 $user = $context->getUser();
1351
1352                 $td = $language->userTimeAndDate( $timestamp, $user );
1353                 $tddate = $language->userDate( $timestamp, $user );
1354                 $tdtime = $language->userTime( $timestamp, $user );
1355
1356                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1357                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1358
1359                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1360                         ? 'revision-info-current'
1361                         : 'revision-info';
1362
1363                 $outputPage = $context->getOutput();
1364                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1365                         $context->msg( $infomsg, $td )
1366                                 ->rawParams( $userlinks )
1367                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1368                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1369                                 ->parse() .
1370                         "</div>";
1371
1372                 $lnk = $current
1373                         ? $context->msg( 'currentrevisionlink' )->escaped()
1374                         : Linker::linkKnown(
1375                                 $this->getTitle(),
1376                                 $context->msg( 'currentrevisionlink' )->escaped(),
1377                                 [],
1378                                 $extraParams
1379                         );
1380                 $curdiff = $current
1381                         ? $context->msg( 'diff' )->escaped()
1382                         : Linker::linkKnown(
1383                                 $this->getTitle(),
1384                                 $context->msg( 'diff' )->escaped(),
1385                                 [],
1386                                 [
1387                                         'diff' => 'cur',
1388                                         'oldid' => $oldid
1389                                 ] + $extraParams
1390                         );
1391                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1392                 $prevlink = $prev
1393                         ? Linker::linkKnown(
1394                                 $this->getTitle(),
1395                                 $context->msg( 'previousrevision' )->escaped(),
1396                                 [],
1397                                 [
1398                                         'direction' => 'prev',
1399                                         'oldid' => $oldid
1400                                 ] + $extraParams
1401                         )
1402                         : $context->msg( 'previousrevision' )->escaped();
1403                 $prevdiff = $prev
1404                         ? Linker::linkKnown(
1405                                 $this->getTitle(),
1406                                 $context->msg( 'diff' )->escaped(),
1407                                 [],
1408                                 [
1409                                         'diff' => 'prev',
1410                                         'oldid' => $oldid
1411                                 ] + $extraParams
1412                         )
1413                         : $context->msg( 'diff' )->escaped();
1414                 $nextlink = $current
1415                         ? $context->msg( 'nextrevision' )->escaped()
1416                         : Linker::linkKnown(
1417                                 $this->getTitle(),
1418                                 $context->msg( 'nextrevision' )->escaped(),
1419                                 [],
1420                                 [
1421                                         'direction' => 'next',
1422                                         'oldid' => $oldid
1423                                 ] + $extraParams
1424                         );
1425                 $nextdiff = $current
1426                         ? $context->msg( 'diff' )->escaped()
1427                         : Linker::linkKnown(
1428                                 $this->getTitle(),
1429                                 $context->msg( 'diff' )->escaped(),
1430                                 [],
1431                                 [
1432                                         'diff' => 'next',
1433                                         'oldid' => $oldid
1434                                 ] + $extraParams
1435                         );
1436
1437                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1438                 if ( $cdel !== '' ) {
1439                         $cdel .= ' ';
1440                 }
1441
1442                 // the outer div is need for styling the revision info and nav in MobileFrontend
1443                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1444                         "<div id=\"mw-revision-nav\">" . $cdel .
1445                         $context->msg( 'revision-nav' )->rawParams(
1446                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1447                         )->escaped() . "</div></div>" );
1448         }
1449
1450         /**
1451          * Return the HTML for the top of a redirect page
1452          *
1453          * Chances are you should just be using the ParserOutput from
1454          * WikitextContent::getParserOutput instead of calling this for redirects.
1455          *
1456          * @param Title|array $target Destination(s) to redirect
1457          * @param bool $appendSubtitle [optional]
1458          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1459          * @return string Containing HTML with redirect link
1460          *
1461          * @deprecated since 1.30
1462          */
1463         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1464                 $lang = $this->getTitle()->getPageLanguage();
1465                 $out = $this->getContext()->getOutput();
1466                 if ( $appendSubtitle ) {
1467                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1468                 }
1469                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1470                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1471         }
1472
1473         /**
1474          * Return the HTML for the top of a redirect page
1475          *
1476          * Chances are you should just be using the ParserOutput from
1477          * WikitextContent::getParserOutput instead of calling this for redirects.
1478          *
1479          * @since 1.23
1480          * @param Language $lang
1481          * @param Title|array $target Destination(s) to redirect
1482          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1483          * @return string Containing HTML with redirect link
1484          */
1485         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1486                 if ( !is_array( $target ) ) {
1487                         $target = [ $target ];
1488                 }
1489
1490                 $html = '<ul class="redirectText">';
1491                 /** @var Title $title */
1492                 foreach ( $target as $title ) {
1493                         $html .= '<li>' . Linker::link(
1494                                 $title,
1495                                 htmlspecialchars( $title->getFullText() ),
1496                                 [],
1497                                 // Make sure wiki page redirects are not followed
1498                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1499                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1500                         ) . '</li>';
1501                 }
1502                 $html .= '</ul>';
1503
1504                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1505
1506                 return '<div class="redirectMsg">' .
1507                         '<p>' . $redirectToText . '</p>' .
1508                         $html .
1509                         '</div>';
1510         }
1511
1512         /**
1513          * Adds help link with an icon via page indicators.
1514          * Link target can be overridden by a local message containing a wikilink:
1515          * the message key is: 'namespace-' + namespace number + '-helppage'.
1516          * @param string $to Target MediaWiki.org page title or encoded URL.
1517          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1518          * @since 1.25
1519          */
1520         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1521                 $msg = wfMessage(
1522                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1523                 );
1524
1525                 $out = $this->getContext()->getOutput();
1526                 if ( !$msg->isDisabled() ) {
1527                         $helpUrl = Skin::makeUrl( $msg->plain() );
1528                         $out->addHelpLink( $helpUrl, true );
1529                 } else {
1530                         $out->addHelpLink( $to, $overrideBaseUrl );
1531                 }
1532         }
1533
1534         /**
1535          * Handle action=render
1536          */
1537         public function render() {
1538                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1539                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1540                 $this->disableSectionEditForRender = true;
1541                 $this->view();
1542         }
1543
1544         /**
1545          * action=protect handler
1546          */
1547         public function protect() {
1548                 $form = new ProtectionForm( $this );
1549                 $form->execute();
1550         }
1551
1552         /**
1553          * action=unprotect handler (alias)
1554          */
1555         public function unprotect() {
1556                 $this->protect();
1557         }
1558
1559         /**
1560          * UI entry point for page deletion
1561          */
1562         public function delete() {
1563                 # This code desperately needs to be totally rewritten
1564
1565                 $title = $this->getTitle();
1566                 $context = $this->getContext();
1567                 $user = $context->getUser();
1568                 $request = $context->getRequest();
1569
1570                 # Check permissions
1571                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1572                 if ( count( $permissionErrors ) ) {
1573                         throw new PermissionsError( 'delete', $permissionErrors );
1574                 }
1575
1576                 # Read-only check...
1577                 if ( wfReadOnly() ) {
1578                         throw new ReadOnlyError;
1579                 }
1580
1581                 # Better double-check that it hasn't been deleted yet!
1582                 $this->mPage->loadPageData(
1583                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1584                 );
1585                 if ( !$this->mPage->exists() ) {
1586                         $deleteLogPage = new LogPage( 'delete' );
1587                         $outputPage = $context->getOutput();
1588                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1589                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1590                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1591                                 );
1592                         $outputPage->addHTML(
1593                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1594                         );
1595                         LogEventsList::showLogExtract(
1596                                 $outputPage,
1597                                 'delete',
1598                                 $title
1599                         );
1600
1601                         return;
1602                 }
1603
1604                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1605                 $deleteReason = $request->getText( 'wpReason' );
1606
1607                 if ( $deleteReasonList == 'other' ) {
1608                         $reason = $deleteReason;
1609                 } elseif ( $deleteReason != '' ) {
1610                         // Entry from drop down menu + additional comment
1611                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1612                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1613                 } else {
1614                         $reason = $deleteReasonList;
1615                 }
1616
1617                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1618                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1619                 ) {
1620                         # Flag to hide all contents of the archived revisions
1621                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1622
1623                         $this->doDelete( $reason, $suppress );
1624
1625                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1626
1627                         return;
1628                 }
1629
1630                 // Generate deletion reason
1631                 $hasHistory = false;
1632                 if ( !$reason ) {
1633                         try {
1634                                 $reason = $this->generateReason( $hasHistory );
1635                         } catch ( Exception $e ) {
1636                                 # if a page is horribly broken, we still want to be able to
1637                                 # delete it. So be lenient about errors here.
1638                                 wfDebug( "Error while building auto delete summary: $e" );
1639                                 $reason = '';
1640                         }
1641                 }
1642
1643                 // If the page has a history, insert a warning
1644                 if ( $hasHistory ) {
1645                         $title = $this->getTitle();
1646
1647                         // The following can use the real revision count as this is only being shown for users
1648                         // that can delete this page.
1649                         // This, as a side-effect, also makes sure that the following query isn't being run for
1650                         // pages with a larger history, unless the user has the 'bigdelete' right
1651                         // (and is about to delete this page).
1652                         $dbr = wfGetDB( DB_REPLICA );
1653                         $revisions = $edits = (int)$dbr->selectField(
1654                                 'revision',
1655                                 'COUNT(rev_page)',
1656                                 [ 'rev_page' => $title->getArticleID() ],
1657                                 __METHOD__
1658                         );
1659
1660                         // @todo FIXME: i18n issue/patchwork message
1661                         $context->getOutput()->addHTML(
1662                                 '<strong class="mw-delete-warning-revisions">' .
1663                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1664                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1665                                         $context->msg( 'history' )->escaped(),
1666                                         [],
1667                                         [ 'action' => 'history' ] ) .
1668                                 '</strong>'
1669                         );
1670
1671                         if ( $title->isBigDeletion() ) {
1672                                 global $wgDeleteRevisionsLimit;
1673                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1674                                         [
1675                                                 'delete-warning-toobig',
1676                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1677                                         ]
1678                                 );
1679                         }
1680                 }
1681
1682                 $this->confirmDelete( $reason );
1683         }
1684
1685         /**
1686          * Output deletion confirmation dialog
1687          * @todo FIXME: Move to another file?
1688          * @param string $reason Prefilled reason
1689          */
1690         public function confirmDelete( $reason ) {
1691                 wfDebug( "Article::confirmDelete\n" );
1692
1693                 $title = $this->getTitle();
1694                 $ctx = $this->getContext();
1695                 $outputPage = $ctx->getOutput();
1696                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1697                 $outputPage->addBacklinkSubtitle( $title );
1698                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1699                 $outputPage->addModules( 'mediawiki.action.delete' );
1700
1701                 $backlinkCache = $title->getBacklinkCache();
1702                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1703                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1704                                 'deleting-backlinks-warning' );
1705                 }
1706
1707                 $subpageQueryLimit = 51;
1708                 $subpages = $title->getSubpages( $subpageQueryLimit );
1709                 $subpageCount = count( $subpages );
1710                 if ( $subpageCount > 0 ) {
1711                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1712                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1713                 }
1714                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1715
1716                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1717
1718                 $user = $this->getContext()->getUser();
1719                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1720
1721                 $outputPage->enableOOUI();
1722
1723                 $options = Xml::listDropDownOptions(
1724                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1725                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1726                 );
1727                 $options = Xml::listDropDownOptionsOoui( $options );
1728
1729                 $fields[] = new OOUI\FieldLayout(
1730                         new OOUI\DropdownInputWidget( [
1731                                 'name' => 'wpDeleteReasonList',
1732                                 'inputId' => 'wpDeleteReasonList',
1733                                 'tabIndex' => 1,
1734                                 'infusable' => true,
1735                                 'value' => '',
1736                                 'options' => $options
1737                         ] ),
1738                         [
1739                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1740                                 'align' => 'top',
1741                         ]
1742                 );
1743
1744                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1745                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1746                 // Unicode codepoints (or 255 UTF-8 bytes for old schema).
1747                 $conf = $this->getContext()->getConfig();
1748                 $oldCommentSchema = $conf->get( 'CommentTableSchemaMigrationStage' ) === MIGRATION_OLD;
1749                 $fields[] = new OOUI\FieldLayout(
1750                         new OOUI\TextInputWidget( [
1751                                 'name' => 'wpReason',
1752                                 'inputId' => 'wpReason',
1753                                 'tabIndex' => 2,
1754                                 'maxLength' => $oldCommentSchema ? 255 : CommentStore::COMMENT_CHARACTER_LIMIT,
1755                                 'infusable' => true,
1756                                 'value' => $reason,
1757                                 'autofocus' => true,
1758                         ] ),
1759                         [
1760                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1761                                 'align' => 'top',
1762                         ]
1763                 );
1764
1765                 if ( $user->isLoggedIn() ) {
1766                         $fields[] = new OOUI\FieldLayout(
1767                                 new OOUI\CheckboxInputWidget( [
1768                                         'name' => 'wpWatch',
1769                                         'inputId' => 'wpWatch',
1770                                         'tabIndex' => 3,
1771                                         'selected' => $checkWatch,
1772                                 ] ),
1773                                 [
1774                                         'label' => $ctx->msg( 'watchthis' )->text(),
1775                                         'align' => 'inline',
1776                                         'infusable' => true,
1777                                 ]
1778                         );
1779                 }
1780
1781                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1782                         $fields[] = new OOUI\FieldLayout(
1783                                 new OOUI\CheckboxInputWidget( [
1784                                         'name' => 'wpSuppress',
1785                                         'inputId' => 'wpSuppress',
1786                                         'tabIndex' => 4,
1787                                 ] ),
1788                                 [
1789                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1790                                         'align' => 'inline',
1791                                         'infusable' => true,
1792                                 ]
1793                         );
1794                 }
1795
1796                 $fields[] = new OOUI\FieldLayout(
1797                         new OOUI\ButtonInputWidget( [
1798                                 'name' => 'wpConfirmB',
1799                                 'inputId' => 'wpConfirmB',
1800                                 'tabIndex' => 5,
1801                                 'value' => $ctx->msg( 'deletepage' )->text(),
1802                                 'label' => $ctx->msg( 'deletepage' )->text(),
1803                                 'flags' => [ 'primary', 'destructive' ],
1804                                 'type' => 'submit',
1805                         ] ),
1806                         [
1807                                 'align' => 'top',
1808                         ]
1809                 );
1810
1811                 $fieldset = new OOUI\FieldsetLayout( [
1812                         'label' => $ctx->msg( 'delete-legend' )->text(),
1813                         'id' => 'mw-delete-table',
1814                         'items' => $fields,
1815                 ] );
1816
1817                 $form = new OOUI\FormLayout( [
1818                         'method' => 'post',
1819                         'action' => $title->getLocalURL( 'action=delete' ),
1820                         'id' => 'deleteconfirm',
1821                 ] );
1822                 $form->appendContent(
1823                         $fieldset,
1824                         new OOUI\HtmlSnippet(
1825                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
1826                         )
1827                 );
1828
1829                 $outputPage->addHTML(
1830                         new OOUI\PanelLayout( [
1831                                 'classes' => [ 'deletepage-wrapper' ],
1832                                 'expanded' => false,
1833                                 'padded' => true,
1834                                 'framed' => true,
1835                                 'content' => $form,
1836                         ] )
1837                 );
1838
1839                 if ( $user->isAllowed( 'editinterface' ) ) {
1840                         $link = Linker::linkKnown(
1841                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
1842                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
1843                                 [],
1844                                 [ 'action' => 'edit' ]
1845                         );
1846                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
1847                 }
1848
1849                 $deleteLogPage = new LogPage( 'delete' );
1850                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1851                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1852         }
1853
1854         /**
1855          * Perform a deletion and output success or failure messages
1856          * @param string $reason
1857          * @param bool $suppress
1858          */
1859         public function doDelete( $reason, $suppress = false ) {
1860                 $error = '';
1861                 $context = $this->getContext();
1862                 $outputPage = $context->getOutput();
1863                 $user = $context->getUser();
1864                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user );
1865
1866                 if ( $status->isGood() ) {
1867                         $deleted = $this->getTitle()->getPrefixedText();
1868
1869                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1870                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1871
1872                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1873
1874                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1875
1876                         Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
1877
1878                         $outputPage->returnToMain( false );
1879                 } else {
1880                         $outputPage->setPageTitle(
1881                                 wfMessage( 'cannotdelete-title',
1882                                         $this->getTitle()->getPrefixedText() )
1883                         );
1884
1885                         if ( $error == '' ) {
1886                                 $outputPage->addWikiText(
1887                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1888                                 );
1889                                 $deleteLogPage = new LogPage( 'delete' );
1890                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1891
1892                                 LogEventsList::showLogExtract(
1893                                         $outputPage,
1894                                         'delete',
1895                                         $this->getTitle()
1896                                 );
1897                         } else {
1898                                 $outputPage->addHTML( $error );
1899                         }
1900                 }
1901         }
1902
1903         /* Caching functions */
1904
1905         /**
1906          * checkLastModified returns true if it has taken care of all
1907          * output to the client that is necessary for this request.
1908          * (that is, it has sent a cached version of the page)
1909          *
1910          * @return bool True if cached version send, false otherwise
1911          */
1912         protected function tryFileCache() {
1913                 static $called = false;
1914
1915                 if ( $called ) {
1916                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1917                         return false;
1918                 }
1919
1920                 $called = true;
1921                 if ( $this->isFileCacheable() ) {
1922                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1923                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1924                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1925                                 $cache->loadFromFileCache( $this->getContext() );
1926                                 return true;
1927                         } else {
1928                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1929                                 ob_start( [ &$cache, 'saveToFileCache' ] );
1930                         }
1931                 } else {
1932                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1933                 }
1934
1935                 return false;
1936         }
1937
1938         /**
1939          * Check if the page can be cached
1940          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
1941          * @return bool
1942          */
1943         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
1944                 $cacheable = false;
1945
1946                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
1947                         $cacheable = $this->mPage->getId()
1948                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1949                         // Extension may have reason to disable file caching on some pages.
1950                         if ( $cacheable ) {
1951                                 // Avoid PHP 7.1 warning of passing $this by reference
1952                                 $articlePage = $this;
1953                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
1954                         }
1955                 }
1956
1957                 return $cacheable;
1958         }
1959
1960         /**#@-*/
1961
1962         /**
1963          * Lightweight method to get the parser output for a page, checking the parser cache
1964          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1965          * consider, so it's not appropriate to use there.
1966          *
1967          * @since 1.16 (r52326) for LiquidThreads
1968          *
1969          * @param int|null $oldid Revision ID or null
1970          * @param User|null $user The relevant user
1971          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1972          */
1973         public function getParserOutput( $oldid = null, User $user = null ) {
1974                 // XXX: bypasses mParserOptions and thus setParserOptions()
1975
1976                 if ( $user === null ) {
1977                         $parserOptions = $this->getParserOptions();
1978                 } else {
1979                         $parserOptions = $this->mPage->makeParserOptions( $user );
1980                 }
1981
1982                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1983         }
1984
1985         /**
1986          * Override the ParserOptions used to render the primary article wikitext.
1987          *
1988          * @param ParserOptions $options
1989          * @throws MWException If the parser options where already initialized.
1990          */
1991         public function setParserOptions( ParserOptions $options ) {
1992                 if ( $this->mParserOptions ) {
1993                         throw new MWException( "can't change parser options after they have already been set" );
1994                 }
1995
1996                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1997                 $this->mParserOptions = clone $options;
1998         }
1999
2000         /**
2001          * Get parser options suitable for rendering the primary article wikitext
2002          * @return ParserOptions
2003          */
2004         public function getParserOptions() {
2005                 if ( !$this->mParserOptions ) {
2006                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2007                 }
2008                 // Clone to allow modifications of the return value without affecting cache
2009                 return clone $this->mParserOptions;
2010         }
2011
2012         /**
2013          * Sets the context this Article is executed in
2014          *
2015          * @param IContextSource $context
2016          * @since 1.18
2017          */
2018         public function setContext( $context ) {
2019                 $this->mContext = $context;
2020         }
2021
2022         /**
2023          * Gets the context this Article is executed in
2024          *
2025          * @return IContextSource
2026          * @since 1.18
2027          */
2028         public function getContext() {
2029                 if ( $this->mContext instanceof IContextSource ) {
2030                         return $this->mContext;
2031                 } else {
2032                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2033                                 "Return RequestContext::getMain(); for sanity\n" );
2034                         return RequestContext::getMain();
2035                 }
2036         }
2037
2038         /**
2039          * Use PHP's magic __get handler to handle accessing of
2040          * raw WikiPage fields for backwards compatibility.
2041          *
2042          * @param string $fname Field name
2043          * @return mixed
2044          */
2045         public function __get( $fname ) {
2046                 if ( property_exists( $this->mPage, $fname ) ) {
2047                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2048                         return $this->mPage->$fname;
2049                 }
2050                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2051         }
2052
2053         /**
2054          * Use PHP's magic __set handler to handle setting of
2055          * raw WikiPage fields for backwards compatibility.
2056          *
2057          * @param string $fname Field name
2058          * @param mixed $fvalue New value
2059          */
2060         public function __set( $fname, $fvalue ) {
2061                 if ( property_exists( $this->mPage, $fname ) ) {
2062                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2063                         $this->mPage->$fname = $fvalue;
2064                 // Note: extensions may want to toss on new fields
2065                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2066                         $this->mPage->$fname = $fvalue;
2067                 } else {
2068                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2069                 }
2070         }
2071
2072         /**
2073          * Call to WikiPage function for backwards compatibility.
2074          * @see WikiPage::checkFlags
2075          */
2076         public function checkFlags( $flags ) {
2077                 return $this->mPage->checkFlags( $flags );
2078         }
2079
2080         /**
2081          * Call to WikiPage function for backwards compatibility.
2082          * @see WikiPage::checkTouched
2083          */
2084         public function checkTouched() {
2085                 return $this->mPage->checkTouched();
2086         }
2087
2088         /**
2089          * Call to WikiPage function for backwards compatibility.
2090          * @see WikiPage::clearPreparedEdit
2091          */
2092         public function clearPreparedEdit() {
2093                 $this->mPage->clearPreparedEdit();
2094         }
2095
2096         /**
2097          * Call to WikiPage function for backwards compatibility.
2098          * @see WikiPage::doDeleteArticleReal
2099          */
2100         public function doDeleteArticleReal(
2101                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2102                 $tags = []
2103         ) {
2104                 return $this->mPage->doDeleteArticleReal(
2105                         $reason, $suppress, $u1, $u2, $error, $user, $tags
2106                 );
2107         }
2108
2109         /**
2110          * Call to WikiPage function for backwards compatibility.
2111          * @see WikiPage::doDeleteUpdates
2112          */
2113         public function doDeleteUpdates( $id, Content $content = null ) {
2114                 return $this->mPage->doDeleteUpdates( $id, $content );
2115         }
2116
2117         /**
2118          * Call to WikiPage function for backwards compatibility.
2119          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2120          * @see WikiPage::doEditContent
2121          */
2122         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2123                 User $user = null, $serialFormat = null
2124         ) {
2125                 wfDeprecated( __METHOD__, '1.29' );
2126                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2127                         $user, $serialFormat
2128                 );
2129         }
2130
2131         /**
2132          * Call to WikiPage function for backwards compatibility.
2133          * @see WikiPage::doEditUpdates
2134          */
2135         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2136                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2137         }
2138
2139         /**
2140          * Call to WikiPage function for backwards compatibility.
2141          * @see WikiPage::doPurge
2142          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2143          *  controlled how much purging was done.
2144          */
2145         public function doPurge() {
2146                 return $this->mPage->doPurge();
2147         }
2148
2149         /**
2150          * Call to WikiPage function for backwards compatibility.
2151          * @see WikiPage::doViewUpdates
2152          */
2153         public function doViewUpdates( User $user, $oldid = 0 ) {
2154                 $this->mPage->doViewUpdates( $user, $oldid );
2155         }
2156
2157         /**
2158          * Call to WikiPage function for backwards compatibility.
2159          * @see WikiPage::exists
2160          */
2161         public function exists() {
2162                 return $this->mPage->exists();
2163         }
2164
2165         /**
2166          * Call to WikiPage function for backwards compatibility.
2167          * @see WikiPage::followRedirect
2168          */
2169         public function followRedirect() {
2170                 return $this->mPage->followRedirect();
2171         }
2172
2173         /**
2174          * Call to WikiPage function for backwards compatibility.
2175          * @see ContentHandler::getActionOverrides
2176          */
2177         public function getActionOverrides() {
2178                 return $this->mPage->getActionOverrides();
2179         }
2180
2181         /**
2182          * Call to WikiPage function for backwards compatibility.
2183          * @see WikiPage::getAutoDeleteReason
2184          */
2185         public function getAutoDeleteReason( &$hasHistory ) {
2186                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2187         }
2188
2189         /**
2190          * Call to WikiPage function for backwards compatibility.
2191          * @see WikiPage::getCategories
2192          */
2193         public function getCategories() {
2194                 return $this->mPage->getCategories();
2195         }
2196
2197         /**
2198          * Call to WikiPage function for backwards compatibility.
2199          * @see WikiPage::getComment
2200          */
2201         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2202                 return $this->mPage->getComment( $audience, $user );
2203         }
2204
2205         /**
2206          * Call to WikiPage function for backwards compatibility.
2207          * @see WikiPage::getContentHandler
2208          */
2209         public function getContentHandler() {
2210                 return $this->mPage->getContentHandler();
2211         }
2212
2213         /**
2214          * Call to WikiPage function for backwards compatibility.
2215          * @see WikiPage::getContentModel
2216          */
2217         public function getContentModel() {
2218                 return $this->mPage->getContentModel();
2219         }
2220
2221         /**
2222          * Call to WikiPage function for backwards compatibility.
2223          * @see WikiPage::getContributors
2224          */
2225         public function getContributors() {
2226                 return $this->mPage->getContributors();
2227         }
2228
2229         /**
2230          * Call to WikiPage function for backwards compatibility.
2231          * @see WikiPage::getCreator
2232          */
2233         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2234                 return $this->mPage->getCreator( $audience, $user );
2235         }
2236
2237         /**
2238          * Call to WikiPage function for backwards compatibility.
2239          * @see WikiPage::getDeletionUpdates
2240          */
2241         public function getDeletionUpdates( Content $content = null ) {
2242                 return $this->mPage->getDeletionUpdates( $content );
2243         }
2244
2245         /**
2246          * Call to WikiPage function for backwards compatibility.
2247          * @see WikiPage::getHiddenCategories
2248          */
2249         public function getHiddenCategories() {
2250                 return $this->mPage->getHiddenCategories();
2251         }
2252
2253         /**
2254          * Call to WikiPage function for backwards compatibility.
2255          * @see WikiPage::getId
2256          */
2257         public function getId() {
2258                 return $this->mPage->getId();
2259         }
2260
2261         /**
2262          * Call to WikiPage function for backwards compatibility.
2263          * @see WikiPage::getLatest
2264          */
2265         public function getLatest() {
2266                 return $this->mPage->getLatest();
2267         }
2268
2269         /**
2270          * Call to WikiPage function for backwards compatibility.
2271          * @see WikiPage::getLinksTimestamp
2272          */
2273         public function getLinksTimestamp() {
2274                 return $this->mPage->getLinksTimestamp();
2275         }
2276
2277         /**
2278          * Call to WikiPage function for backwards compatibility.
2279          * @see WikiPage::getMinorEdit
2280          */
2281         public function getMinorEdit() {
2282                 return $this->mPage->getMinorEdit();
2283         }
2284
2285         /**
2286          * Call to WikiPage function for backwards compatibility.
2287          * @see WikiPage::getOldestRevision
2288          */
2289         public function getOldestRevision() {
2290                 return $this->mPage->getOldestRevision();
2291         }
2292
2293         /**
2294          * Call to WikiPage function for backwards compatibility.
2295          * @see WikiPage::getRedirectTarget
2296          */
2297         public function getRedirectTarget() {
2298                 return $this->mPage->getRedirectTarget();
2299         }
2300
2301         /**
2302          * Call to WikiPage function for backwards compatibility.
2303          * @see WikiPage::getRedirectURL
2304          */
2305         public function getRedirectURL( $rt ) {
2306                 return $this->mPage->getRedirectURL( $rt );
2307         }
2308
2309         /**
2310          * Call to WikiPage function for backwards compatibility.
2311          * @see WikiPage::getRevision
2312          */
2313         public function getRevision() {
2314                 return $this->mPage->getRevision();
2315         }
2316
2317         /**
2318          * Call to WikiPage function for backwards compatibility.
2319          * @see WikiPage::getTimestamp
2320          */
2321         public function getTimestamp() {
2322                 return $this->mPage->getTimestamp();
2323         }
2324
2325         /**
2326          * Call to WikiPage function for backwards compatibility.
2327          * @see WikiPage::getTouched
2328          */
2329         public function getTouched() {
2330                 return $this->mPage->getTouched();
2331         }
2332
2333         /**
2334          * Call to WikiPage function for backwards compatibility.
2335          * @see WikiPage::getUndoContent
2336          */
2337         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2338                 return $this->mPage->getUndoContent( $undo, $undoafter );
2339         }
2340
2341         /**
2342          * Call to WikiPage function for backwards compatibility.
2343          * @see WikiPage::getUser
2344          */
2345         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2346                 return $this->mPage->getUser( $audience, $user );
2347         }
2348
2349         /**
2350          * Call to WikiPage function for backwards compatibility.
2351          * @see WikiPage::getUserText
2352          */
2353         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2354                 return $this->mPage->getUserText( $audience, $user );
2355         }
2356
2357         /**
2358          * Call to WikiPage function for backwards compatibility.
2359          * @see WikiPage::hasViewableContent
2360          */
2361         public function hasViewableContent() {
2362                 return $this->mPage->hasViewableContent();
2363         }
2364
2365         /**
2366          * Call to WikiPage function for backwards compatibility.
2367          * @see WikiPage::insertOn
2368          */
2369         public function insertOn( $dbw, $pageId = null ) {
2370                 return $this->mPage->insertOn( $dbw, $pageId );
2371         }
2372
2373         /**
2374          * Call to WikiPage function for backwards compatibility.
2375          * @see WikiPage::insertProtectNullRevision
2376          */
2377         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2378                 array $expiry, $cascade, $reason, $user = null
2379         ) {
2380                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2381                         $expiry, $cascade, $reason, $user
2382                 );
2383         }
2384
2385         /**
2386          * Call to WikiPage function for backwards compatibility.
2387          * @see WikiPage::insertRedirect
2388          */
2389         public function insertRedirect() {
2390                 return $this->mPage->insertRedirect();
2391         }
2392
2393         /**
2394          * Call to WikiPage function for backwards compatibility.
2395          * @see WikiPage::insertRedirectEntry
2396          */
2397         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2398                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2399         }
2400
2401         /**
2402          * Call to WikiPage function for backwards compatibility.
2403          * @see WikiPage::isCountable
2404          */
2405         public function isCountable( $editInfo = false ) {
2406                 return $this->mPage->isCountable( $editInfo );
2407         }
2408
2409         /**
2410          * Call to WikiPage function for backwards compatibility.
2411          * @see WikiPage::isRedirect
2412          */
2413         public function isRedirect() {
2414                 return $this->mPage->isRedirect();
2415         }
2416
2417         /**
2418          * Call to WikiPage function for backwards compatibility.
2419          * @see WikiPage::loadFromRow
2420          */
2421         public function loadFromRow( $data, $from ) {
2422                 return $this->mPage->loadFromRow( $data, $from );
2423         }
2424
2425         /**
2426          * Call to WikiPage function for backwards compatibility.
2427          * @see WikiPage::loadPageData
2428          */
2429         public function loadPageData( $from = 'fromdb' ) {
2430                 $this->mPage->loadPageData( $from );
2431         }
2432
2433         /**
2434          * Call to WikiPage function for backwards compatibility.
2435          * @see WikiPage::lockAndGetLatest
2436          */
2437         public function lockAndGetLatest() {
2438                 return $this->mPage->lockAndGetLatest();
2439         }
2440
2441         /**
2442          * Call to WikiPage function for backwards compatibility.
2443          * @see WikiPage::makeParserOptions
2444          */
2445         public function makeParserOptions( $context ) {
2446                 return $this->mPage->makeParserOptions( $context );
2447         }
2448
2449         /**
2450          * Call to WikiPage function for backwards compatibility.
2451          * @see WikiPage::pageDataFromId
2452          */
2453         public function pageDataFromId( $dbr, $id, $options = [] ) {
2454                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2455         }
2456
2457         /**
2458          * Call to WikiPage function for backwards compatibility.
2459          * @see WikiPage::pageDataFromTitle
2460          */
2461         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2462                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2463         }
2464
2465         /**
2466          * Call to WikiPage function for backwards compatibility.
2467          * @see WikiPage::prepareContentForEdit
2468          */
2469         public function prepareContentForEdit(
2470                 Content $content, $revision = null, User $user = null,
2471                 $serialFormat = null, $useCache = true
2472         ) {
2473                 return $this->mPage->prepareContentForEdit(
2474                         $content, $revision, $user,
2475                         $serialFormat, $useCache
2476                 );
2477         }
2478
2479         /**
2480          * Call to WikiPage function for backwards compatibility.
2481          * @see WikiPage::protectDescription
2482          */
2483         public function protectDescription( array $limit, array $expiry ) {
2484                 return $this->mPage->protectDescription( $limit, $expiry );
2485         }
2486
2487         /**
2488          * Call to WikiPage function for backwards compatibility.
2489          * @see WikiPage::protectDescriptionLog
2490          */
2491         public function protectDescriptionLog( array $limit, array $expiry ) {
2492                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2493         }
2494
2495         /**
2496          * Call to WikiPage function for backwards compatibility.
2497          * @see WikiPage::replaceSectionAtRev
2498          */
2499         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2500                 $sectionTitle = '', $baseRevId = null
2501         ) {
2502                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2503                         $sectionTitle, $baseRevId
2504                 );
2505         }
2506
2507         /**
2508          * Call to WikiPage function for backwards compatibility.
2509          * @see WikiPage::replaceSectionContent
2510          */
2511         public function replaceSectionContent(
2512                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2513         ) {
2514                 return $this->mPage->replaceSectionContent(
2515                         $sectionId, $sectionContent, $sectionTitle, $edittime
2516                 );
2517         }
2518
2519         /**
2520          * Call to WikiPage function for backwards compatibility.
2521          * @see WikiPage::setTimestamp
2522          */
2523         public function setTimestamp( $ts ) {
2524                 return $this->mPage->setTimestamp( $ts );
2525         }
2526
2527         /**
2528          * Call to WikiPage function for backwards compatibility.
2529          * @see WikiPage::shouldCheckParserCache
2530          */
2531         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2532                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2533         }
2534
2535         /**
2536          * Call to WikiPage function for backwards compatibility.
2537          * @see WikiPage::supportsSections
2538          */
2539         public function supportsSections() {
2540                 return $this->mPage->supportsSections();
2541         }
2542
2543         /**
2544          * Call to WikiPage function for backwards compatibility.
2545          * @see WikiPage::triggerOpportunisticLinksUpdate
2546          */
2547         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2548                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2549         }
2550
2551         /**
2552          * Call to WikiPage function for backwards compatibility.
2553          * @see WikiPage::updateCategoryCounts
2554          */
2555         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2556                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2557         }
2558
2559         /**
2560          * Call to WikiPage function for backwards compatibility.
2561          * @see WikiPage::updateIfNewerOn
2562          */
2563         public function updateIfNewerOn( $dbw, $revision ) {
2564                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2565         }
2566
2567         /**
2568          * Call to WikiPage function for backwards compatibility.
2569          * @see WikiPage::updateRedirectOn
2570          */
2571         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2572                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2573         }
2574
2575         /**
2576          * Call to WikiPage function for backwards compatibility.
2577          * @see WikiPage::updateRevisionOn
2578          */
2579         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2580                 $lastRevIsRedirect = null
2581         ) {
2582                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2583                         $lastRevIsRedirect
2584                 );
2585         }
2586
2587         /**
2588          * @param array $limit
2589          * @param array $expiry
2590          * @param bool &$cascade
2591          * @param string $reason
2592          * @param User $user
2593          * @return Status
2594          */
2595         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2596                 $reason, User $user
2597         ) {
2598                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2599         }
2600
2601         /**
2602          * @param array $limit
2603          * @param string $reason
2604          * @param int &$cascade
2605          * @param array $expiry
2606          * @return bool
2607          */
2608         public function updateRestrictions( $limit = [], $reason = '',
2609                 &$cascade = 0, $expiry = []
2610         ) {
2611                 return $this->mPage->doUpdateRestrictions(
2612                         $limit,
2613                         $expiry,
2614                         $cascade,
2615                         $reason,
2616                         $this->getContext()->getUser()
2617                 );
2618         }
2619
2620         /**
2621          * @param string $reason
2622          * @param bool $suppress
2623          * @param int|null $u1 Unused
2624          * @param bool|null $u2 Unused
2625          * @param string &$error
2626          * @return bool
2627          */
2628         public function doDeleteArticle(
2629                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = ''
2630         ) {
2631                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error );
2632         }
2633
2634         /**
2635          * @param string $fromP
2636          * @param string $summary
2637          * @param string $token
2638          * @param bool $bot
2639          * @param array &$resultDetails
2640          * @param User|null $user
2641          * @return array
2642          */
2643         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2644                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2645                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2646         }
2647
2648         /**
2649          * @param string $fromP
2650          * @param string $summary
2651          * @param bool $bot
2652          * @param array &$resultDetails
2653          * @param User|null $guser
2654          * @return array
2655          */
2656         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2657                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2658                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2659         }
2660
2661         /**
2662          * @param bool &$hasHistory
2663          * @return mixed
2664          */
2665         public function generateReason( &$hasHistory ) {
2666                 $title = $this->mPage->getTitle();
2667                 $handler = ContentHandler::getForTitle( $title );
2668                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2669         }
2670
2671         // ******
2672 }