includes/page/Article.php

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