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\Block\DatabaseBlock;
  23 use MediaWiki\MediaWikiServices;
  24 use MediaWiki\Revision\MutableRevisionRecord;
  25 use MediaWiki\Revision\RevisionRecord;
  26 use MediaWiki\Revision\SlotRecord;
  27
  28 /**
  29  * Class for viewing MediaWiki article and history.
  30  *
  31  * This maintains WikiPage functions for backwards compatibility.
  32  *
  33  * @todo Move and rewrite code to an Action class
  34  *
  35  * Note: edit user interface and cache support functions have been
  36  * moved to separate EditPage and HTMLFileCache classes.
  37  */
  38 class Article implements Page {
  39         /**
  40          * @var IContextSource|null The context this Article is executed in.
  41          * If null, RequestContext::getMain() is used.
  42          */
  43         protected $mContext;
  44
  45         /** @var WikiPage|null The WikiPage object of this instance */
  46         protected $mPage;
  47
  48         /**
  49          * @var ParserOptions|null ParserOptions object for $wgUser articles.
  50          * Initialized by getParserOptions by calling $this->mPage->makeParserOptions().
  51          */
  52         public $mParserOptions;
  53
  54         /**
  55          * @var Content|null Content of the main slot of $this->mRevision.
  56          * @note This variable is read only, setting it has no effect.
  57          *       Extensions that wish to override the output of Article::view should use a hook.
  58          * @todo MCR: Remove in 1.33
  59          * @deprecated since 1.32
  60          * @since 1.21
  61          */
  62         public $mContentObject;
  63
  64         /**
  65          * @var bool Is the target revision loaded? Set by fetchRevisionRecord().
  66          *
  67          * @deprecated since 1.32. Whether content has been loaded should not be relevant to
  68          * code outside this class.
  69          */
  70         public $mContentLoaded = false;
  71
  72         /**
  73          * @var int|null The oldid of the article that was requested to be shown,
  74          * 0 for the current revision.
  75          * @see $mRevIdFetched
  76          */
  77         public $mOldId;
  78
  79         /** @var Title|null Title from which we were redirected here, if any. */
  80         public $mRedirectedFrom = null;
  81
  82         /** @var string|bool URL to redirect to or false if none */
  83         public $mRedirectUrl = false;
  84
  85         /**
  86          * @var int Revision ID of revision that was loaded.
  87          * @see $mOldId
  88          * @deprecated since 1.32, use getRevIdFetched() instead.
  89          */
  90         public $mRevIdFetched = 0;
  91
  92         /**
  93          * @var Status|null represents the outcome of fetchRevisionRecord().
  94          * $fetchResult->value is the RevisionRecord object, if the operation was successful.
  95          *
  96          * The information in $fetchResult is duplicated by the following deprecated public fields:
  97          * $mRevIdFetched, $mContentLoaded. $mRevision (and $mContentObject) also typically duplicate
  98          * information of the loaded revision, but may be overwritten by extensions or due to errors.
  99          */
 100         private $fetchResult = null;
 101
 102         /**
 103          * @var Revision|null Revision to be shown. Initialized by getOldIDFromRequest()
 104          * or fetchContentObject(). Normally loaded from the database, but may be replaced
 105          * by an extension, or be a fake representing an error message or some such.
 106          * While the output of Article::view is typically based on this revision,
 107          * it may be overwritten by error messages or replaced by extensions.
 108          */
 109         public $mRevision = null;
 110
 111         /**
 112          * @var ParserOutput|null|false The ParserOutput generated for viewing the page,
 113          * initialized by view(). If no ParserOutput could be generated, this is set to false.
 114          * @deprecated since 1.32
 115          */
 116         public $mParserOutput = null;
 117
 118         /**
 119          * @var bool Whether render() was called. With the way subclasses work
 120          * here, there doesn't seem to be any other way to stop calling
 121          * OutputPage::enableSectionEditLinks() and still have it work as it did before.
 122          */
 123         protected $viewIsRenderAction = false;
 124
 125         /**
 126          * Constructor and clear the article
 127          * @param Title $title Reference to a Title object.
 128          * @param int|null $oldId Revision ID, null to fetch from request, zero for current
 129          */
 130         public function __construct( Title $title, $oldId = null ) {
 131                 $this->mOldId = $oldId;
 132                 $this->mPage = $this->newPage( $title );
 133         }
 134
 135         /**
 136          * @param Title $title
 137          * @return WikiPage
 138          */
 139         protected function newPage( Title $title ) {
 140                 return new WikiPage( $title );
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          * @param int $id Article ID to load
 146          * @return Article|null
 147          */
 148         public static function newFromID( $id ) {
 149                 $t = Title::newFromID( $id );
 150                 return $t == null ? null : new static( $t );
 151         }
 152
 153         /**
 154          * Create an Article object of the appropriate class for the given page.
 155          *
 156          * @param Title $title
 157          * @param IContextSource $context
 158          * @return Article
 159          */
 160         public static function newFromTitle( $title, IContextSource $context ) {
 161                 if ( NS_MEDIA == $title->getNamespace() ) {
 162                         // XXX: This should not be here, but where should it go?
 163                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 164                 }
 165
 166                 $page = null;
 167                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 168                 if ( !$page ) {
 169                         switch ( $title->getNamespace() ) {
 170                                 case NS_FILE:
 171                                         $page = new ImagePage( $title );
 172                                         break;
 173                                 case NS_CATEGORY:
 174                                         $page = new CategoryPage( $title );
 175                                         break;
 176                                 default:
 177                                         $page = new Article( $title );
 178                         }
 179                 }
 180                 $page->setContext( $context );
 181
 182                 return $page;
 183         }
 184
 185         /**
 186          * Create an Article object of the appropriate class for the given page.
 187          *
 188          * @param WikiPage $page
 189          * @param IContextSource $context
 190          * @return Article
 191          */
 192         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 193                 $article = self::newFromTitle( $page->getTitle(), $context );
 194                 $article->mPage = $page; // override to keep process cached vars
 195                 return $article;
 196         }
 197
 198         /**
 199          * Get the page this view was redirected from
 200          * @return Title|null
 201          * @since 1.28
 202          */
 203         public function getRedirectedFrom() {
 204                 return $this->mRedirectedFrom;
 205         }
 206
 207         /**
 208          * Tell the page view functions that this view was redirected
 209          * from another page on the wiki.
 210          * @param Title $from
 211          */
 212         public function setRedirectedFrom( Title $from ) {
 213                 $this->mRedirectedFrom = $from;
 214         }
 215
 216         /**
 217          * Get the title object of the article
 218          *
 219          * @return Title Title object of this page
 220          */
 221         public function getTitle() {
 222                 return $this->mPage->getTitle();
 223         }
 224
 225         /**
 226          * Get the WikiPage object of this instance
 227          *
 228          * @since 1.19
 229          * @return WikiPage
 230          */
 231         public function getPage() {
 232                 return $this->mPage;
 233         }
 234
 235         /**
 236          * Clear the object
 237          */
 238         public function clear() {
 239                 $this->mContentLoaded = false;
 240
 241                 $this->mRedirectedFrom = null; # Title object if set
 242                 $this->mRevIdFetched = 0;
 243                 $this->mRedirectUrl = false;
 244                 $this->mRevision = null;
 245                 $this->mContentObject = null;
 246                 $this->fetchResult = null;
 247
 248                 // TODO hard-deprecate direct access to public fields
 249
 250                 $this->mPage->clear();
 251         }
 252
 253         /**
 254          * Returns a Content object representing the pages effective display content,
 255          * not necessarily the revision's content!
 256          *
 257          * Note that getContent does not follow redirects anymore.
 258          * If you need to fetch redirectable content easily, try
 259          * the shortcut in WikiPage::getRedirectTarget()
 260          *
 261          * This function has side effects! Do not use this function if you
 262          * only want the real revision text if any.
 263          *
 264          * @deprecated since 1.32, use getRevisionFetched() or fetchRevisionRecord() instead.
 265          *
 266          * @return Content
 267          *
 268          * @since 1.21
 269          */
 270         protected function getContentObject() {
 271                 if ( $this->mPage->getId() === 0 ) {
 272                         $content = $this->getSubstituteContent();
 273                 } else {
 274                         $this->fetchContentObject();
 275                         $content = $this->mContentObject;
 276                 }
 277
 278                 return $content;
 279         }
 280
 281         /**
 282          * Returns Content object to use when the page does not exist.
 283          *
 284          * @return Content
 285          */
 286         private function getSubstituteContent() {
 287                 # If this is a MediaWiki:x message, then load the messages
 288                 # and return the message value for x.
 289                 if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 290                         $text = $this->getTitle()->getDefaultMessageText();
 291                         if ( $text === false ) {
 292                                 $text = '';
 293                         }
 294
 295                         $content = ContentHandler::makeContent( $text, $this->getTitle() );
 296                 } else {
 297                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 298                         $content = new MessageContent( $message, null );
 299                 }
 300
 301                 return $content;
 302         }
 303
 304         /**
 305          * Returns ParserOutput to use when a page does not exist. In some cases, we still want to show
 306          * "virtual" content, e.g. in the MediaWiki namespace, or in the File namespace for non-local
 307          * files.
 308          *
 309          * @param ParserOptions $options
 310          *
 311          * @return ParserOutput
 312          */
 313         protected function getEmptyPageParserOutput( ParserOptions $options ) {
 314                 $content = $this->getSubstituteContent();
 315
 316                 return $content->getParserOutput( $this->getTitle(), 0, $options );
 317         }
 318
 319         /**
 320          * @see getOldIDFromRequest()
 321          * @see getRevIdFetched()
 322          *
 323          * @return int The oldid of the article that is was requested in the constructor or via the
 324          *         context's WebRequest.
 325          */
 326         public function getOldID() {
 327                 if ( is_null( $this->mOldId ) ) {
 328                         $this->mOldId = $this->getOldIDFromRequest();
 329                 }
 330
 331                 return $this->mOldId;
 332         }
 333
 334         /**
 335          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 336          *
 337          * @return int The old id for the request
 338          */
 339         public function getOldIDFromRequest() {
 340                 $this->mRedirectUrl = false;
 341
 342                 $request = $this->getContext()->getRequest();
 343                 $oldid = $request->getIntOrNull( 'oldid' );
 344
 345                 if ( $oldid === null ) {
 346                         return 0;
 347                 }
 348
 349                 if ( $oldid !== 0 ) {
 350                         # Load the given revision and check whether the page is another one.
 351                         # In that case, update this instance to reflect the change.
 352                         if ( $oldid === $this->mPage->getLatest() ) {
 353                                 $this->mRevision = $this->mPage->getRevision();
 354                         } else {
 355                                 $this->mRevision = Revision::newFromId( $oldid );
 356                                 if ( $this->mRevision !== null ) {
 357                                         // Revision title doesn't match the page title given?
 358                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 359                                                 $function = get_class( $this->mPage ) . '::newFromID';
 360                                                 $this->mPage = $function( $this->mRevision->getPage() );
 361                                         }
 362                                 }
 363                         }
 364                 }
 365
 366                 if ( $request->getVal( 'direction' ) == 'next' ) {
 367                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 368                         if ( $nextid ) {
 369                                 $oldid = $nextid;
 370                                 $this->mRevision = null;
 371                         } else {
 372                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 373                         }
 374                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 375                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 376                         if ( $previd ) {
 377                                 $oldid = $previd;
 378                                 $this->mRevision = null;
 379                         }
 380                 }
 381
 382                 $this->mRevIdFetched = $this->mRevision ? $this->mRevision->getId() : 0;
 383
 384                 return $oldid;
 385         }
 386
 387         /**
 388          * Get text content object
 389          * Does *NOT* follow redirects.
 390          * @todo When is this null?
 391          * @deprecated since 1.32, use fetchRevisionRecord() instead.
 392          *
 393          * @note Code that wants to retrieve page content from the database should
 394          * use WikiPage::getContent().
 395          *
 396          * @return Content|null|bool
 397          *
 398          * @since 1.21
 399          */
 400         protected function fetchContentObject() {
 401                 if ( !$this->mContentLoaded ) {
 402                         $this->fetchRevisionRecord();
 403                 }
 404
 405                 return $this->mContentObject;
 406         }
 407
 408         /**
 409          * Fetches the revision to work on.
 410          * The revision is typically loaded from the database, but may also be a fake representing
 411          * an error message or content supplied by an extension. Refer to $this->fetchResult for
 412          * the revision actually loaded from the database, and any errors encountered while doing
 413          * that.
 414          *
 415          * @return RevisionRecord|null
 416          */
 417         protected function fetchRevisionRecord() {
 418                 if ( $this->fetchResult ) {
 419                         return $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 420                 }
 421
 422                 $this->mContentLoaded = true;
 423                 $this->mContentObject = null;
 424
 425                 $oldid = $this->getOldID();
 426
 427                 // $this->mRevision might already be fetched by getOldIDFromRequest()
 428                 if ( !$this->mRevision ) {
 429                         if ( !$oldid ) {
 430                                 $this->mRevision = $this->mPage->getRevision();
 431
 432                                 if ( !$this->mRevision ) {
 433                                         wfDebug( __METHOD__ . " failed to find page data for title " .
 434                                                 $this->getTitle()->getPrefixedText() . "\n" );
 435
 436                                         // Just for sanity, output for this case is done by showMissingArticle().
 437                                         $this->fetchResult = Status::newFatal( 'noarticletext' );
 438                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 439                                         return null;
 440                                 }
 441                         } else {
 442                                 $this->mRevision = Revision::newFromId( $oldid );
 443
 444                                 if ( !$this->mRevision ) {
 445                                         wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid\n" );
 446
 447                                         $this->fetchResult = Status::newFatal( 'missing-revision', $oldid );
 448                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 449                                         return null;
 450                                 }
 451                         }
 452                 }
 453
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455                 $this->fetchResult = Status::newGood( $this->mRevision );
 456
 457                 if (
 458                         !$this->mRevision->userCan( RevisionRecord::DELETED_TEXT, $this->getContext()->getUser() )
 459                 ) {
 460                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 461                                 $this->mRevision->getId() . "\n" );
 462
 463                         // Just for sanity, output for this case is done by showDeletedRevisionHeader().
 464                         $this->fetchResult = Status::newFatal( 'rev-deleted-text-permission' );
 465                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 466                         return null;
 467                 }
 468
 469                 if ( Hooks::isRegistered( 'ArticleAfterFetchContentObject' ) ) {
 470                         $contentObject = $this->mRevision->getContent(
 471                                 RevisionRecord::FOR_THIS_USER,
 472                                 $this->getContext()->getUser()
 473                         );
 474
 475                         $hookContentObject = $contentObject;
 476
 477                                 // Avoid PHP 7.1 warning of passing $this by reference
 478                         $articlePage = $this;
 479
 480                         Hooks::run(
 481                                 'ArticleAfterFetchContentObject',
 482                                 [ &$articlePage, &$hookContentObject ],
 483                                 '1.32'
 484                         );
 485
 486                         if ( $hookContentObject !== $contentObject ) {
 487                                 // A hook handler is trying to override the content
 488                                 $this->applyContentOverride( $hookContentObject );
 489                         }
 490                 }
 491
 492                 // For B/C only
 493                 $this->mContentObject = $this->mRevision->getContent(
 494                         RevisionRecord::FOR_THIS_USER,
 495                         $this->getContext()->getUser()
 496                 );
 497
 498                 return $this->mRevision->getRevisionRecord();
 499         }
 500
 501         /**
 502          * Returns a Content object representing any error in $this->fetchContent, or null
 503          * if there is no such error.
 504          *
 505          * @return Content|null
 506          */
 507         private function makeFetchErrorContent() {
 508                 if ( !$this->fetchResult || $this->fetchResult->isOK() ) {
 509                         return null;
 510                 }
 511
 512                 return new MessageContent( $this->fetchResult->getMessage() );
 513         }
 514
 515         /**
 516          * Applies a content override by constructing a fake Revision object and assigning
 517          * it to mRevision. The fake revision will not have a user, timestamp or summary set.
 518          *
 519          * This mechanism exists mainly to accommodate extensions that use the
 520          * ArticleAfterFetchContentObject. Once that hook has been removed, there should no longer
 521          * be a need for a fake revision object. fetchRevisionRecord() presently also uses this mechanism
 522          * to report errors, but that could be changed to use $this->fetchResult instead.
 523          *
 524          * @param Content $override Content to be used instead of the actual page content,
 525          *        coming from an extension or representing an error message.
 526          */
 527         private function applyContentOverride( Content $override ) {
 528                 // Construct a fake revision
 529                 $rev = new MutableRevisionRecord( $this->getTitle() );
 530                 $rev->setContent( SlotRecord::MAIN, $override );
 531
 532                 $this->mRevision = new Revision( $rev );
 533
 534                 // For B/C only
 535                 $this->mContentObject = $override;
 536         }
 537
 538         /**
 539          * Returns true if the currently-referenced revision is the current edit
 540          * to this page (and it exists).
 541          * @return bool
 542          */
 543         public function isCurrent() {
 544                 # If no oldid, this is the current version.
 545                 if ( $this->getOldID() == 0 ) {
 546                         return true;
 547                 }
 548
 549                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 550         }
 551
 552         /**
 553          * Get the fetched Revision object depending on request parameters or null
 554          * on failure. The revision returned may be a fake representing an error message or
 555          * wrapping content supplied by an extension. Refer to $this->fetchResult for the
 556          * revision actually loaded from the database.
 557          *
 558          * @since 1.19
 559          * @return Revision|null
 560          */
 561         public function getRevisionFetched() {
 562                 $this->fetchRevisionRecord();
 563
 564                 if ( $this->fetchResult->isOK() ) {
 565                         return $this->mRevision;
 566                 }
 567         }
 568
 569         /**
 570          * Use this to fetch the rev ID used on page views
 571          *
 572          * Before fetchRevisionRecord was called, this returns the page's latest revision,
 573          * regardless of what getOldID() returns.
 574          *
 575          * @return int Revision ID of last article revision
 576          */
 577         public function getRevIdFetched() {
 578                 if ( $this->fetchResult && $this->fetchResult->isOK() ) {
 579                         return $this->fetchResult->value->getId();
 580                 } else {
 581                         return $this->mPage->getLatest();
 582                 }
 583         }
 584
 585         /**
 586          * This is the default action of the index.php entry point: just view the
 587          * page of the given title.
 588          */
 589         public function view() {
 590                 global $wgUseFileCache;
 591
 592                 # Get variables from query string
 593                 # As side effect this will load the revision and update the title
 594                 # in a revision ID is passed in the request, so this should remain
 595                 # the first call of this method even if $oldid is used way below.
 596                 $oldid = $this->getOldID();
 597
 598                 $user = $this->getContext()->getUser();
 599                 # Another whitelist check in case getOldID() is altering the title
 600                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 601                 if ( count( $permErrors ) ) {
 602                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 603                         throw new PermissionsError( 'read', $permErrors );
 604                 }
 605
 606                 $outputPage = $this->getContext()->getOutput();
 607                 # getOldID() may as well want us to redirect somewhere else
 608                 if ( $this->mRedirectUrl ) {
 609                         $outputPage->redirect( $this->mRedirectUrl );
 610                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 611
 612                         return;
 613                 }
 614
 615                 # If we got diff in the query, we want to see a diff page instead of the article.
 616                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 617                         wfDebug( __METHOD__ . ": showing diff page\n" );
 618                         $this->showDiffPage();
 619
 620                         return;
 621                 }
 622
 623                 # Set page title (may be overridden by DISPLAYTITLE)
 624                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 625
 626                 $outputPage->setArticleFlag( true );
 627                 # Allow frames by default
 628                 $outputPage->allowClickjacking();
 629
 630                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 631
 632                 $parserOptions = $this->getParserOptions();
 633                 $poOptions = [];
 634                 # Render printable version, use printable version cache
 635                 if ( $outputPage->isPrintable() ) {
 636                         $parserOptions->setIsPrintable( true );
 637                         $poOptions['enableSectionEditLinks'] = false;
 638                 } elseif ( $this->viewIsRenderAction || !$this->isCurrent() ||
 639                         !MediaWikiServices::getInstance()->getPermissionManager()
 640                                 ->quickUserCan( 'edit', $user, $this->getTitle() )
 641                 ) {
 642                         $poOptions['enableSectionEditLinks'] = false;
 643                 }
 644
 645                 # Try client and file cache
 646                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 647                         # Try to stream the output from file cache
 648                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 649                                 wfDebug( __METHOD__ . ": done file cache\n" );
 650                                 # tell wgOut that output is taken care of
 651                                 $outputPage->disable();
 652                                 $this->mPage->doViewUpdates( $user, $oldid );
 653
 654                                 return;
 655                         }
 656                 }
 657
 658                 # Should the parser cache be used?
 659                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 660                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 661                 if ( $user->getStubThreshold() ) {
 662                         MediaWikiServices::getInstance()->getStatsdDataFactory()->increment( 'pcache_miss_stub' );
 663                 }
 664
 665                 $this->showRedirectedFromHeader();
 666                 $this->showNamespaceHeader();
 667
 668                 # Iterate through the possible ways of constructing the output text.
 669                 # Keep going until $outputDone is set, or we run out of things to do.
 670                 $pass = 0;
 671                 $outputDone = false;
 672                 $this->mParserOutput = false;
 673
 674                 while ( !$outputDone && ++$pass ) {
 675                         switch ( $pass ) {
 676                                 case 1:
 677                                         // Avoid PHP 7.1 warning of passing $this by reference
 678                                         $articlePage = $this;
 679                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 680                                         break;
 681                                 case 2:
 682                                         # Early abort if the page doesn't exist
 683                                         if ( !$this->mPage->exists() ) {
 684                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 685                                                 $this->showMissingArticle();
 686                                                 $this->mPage->doViewUpdates( $user );
 687                                                 return;
 688                                         }
 689
 690                                         # Try the parser cache
 691                                         if ( $useParserCache ) {
 692                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 693
 694                                                 if ( $this->mParserOutput !== false ) {
 695                                                         if ( $oldid ) {
 696                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 697                                                                 $this->setOldSubtitle( $oldid );
 698                                                         } else {
 699                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 700                                                         }
 701                                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 702                                                         # Ensure that UI elements requiring revision ID have
 703                                                         # the correct version information.
 704                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 705                                                         # Preload timestamp to avoid a DB hit
 706                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 707                                                         if ( $cachedTimestamp !== null ) {
 708                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 709                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 710                                                         }
 711                                                         $outputDone = true;
 712                                                 }
 713                                         }
 714                                         break;
 715                                 case 3:
 716                                         # Are we looking at an old revision
 717                                         $rev = $this->fetchRevisionRecord();
 718                                         if ( $oldid && $this->fetchResult->isOK() ) {
 719                                                 $this->setOldSubtitle( $oldid );
 720
 721                                                 if ( !$this->showDeletedRevisionHeader() ) {
 722                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 723                                                         return;
 724                                                 }
 725                                         }
 726
 727                                         # Ensure that UI elements requiring revision ID have
 728                                         # the correct version information.
 729                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 730                                         # Preload timestamp to avoid a DB hit
 731                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 732
 733                                         # Pages containing custom CSS or JavaScript get special treatment
 734                                         if ( $this->getTitle()->isSiteConfigPage() || $this->getTitle()->isUserConfigPage() ) {
 735                                                 $dir = $this->getContext()->getLanguage()->getDir();
 736                                                 $lang = $this->getContext()->getLanguage()->getHtmlCode();
 737
 738                                                 $outputPage->wrapWikiMsg(
 739                                                         "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 740                                                         'clearyourcache'
 741                                                 );
 742                                         } elseif ( !Hooks::run( 'ArticleRevisionViewCustom', [
 743                                                         $rev,
 744                                                         $this->getTitle(),
 745                                                         $oldid,
 746                                                         $outputPage,
 747                                                 ] )
 748                                         ) {
 749                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 750                                                 // Allow extensions do their own custom view for certain pages
 751                                                 $outputDone = true;
 752                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 753                                                 [ $this->fetchContentObject(), $this->getTitle(), $outputPage ], '1.32' )
 754                                         ) {
 755                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 756                                                 // Allow extensions do their own custom view for certain pages
 757                                                 $outputDone = true;
 758                                         }
 759                                         break;
 760                                 case 4:
 761                                         # Run the parse, protected by a pool counter
 762                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 763
 764                                         $rev = $this->fetchRevisionRecord();
 765                                         $error = null;
 766
 767                                         if ( $rev ) {
 768                                                 $poolArticleView = new PoolWorkArticleView(
 769                                                         $this->getPage(),
 770                                                         $parserOptions,
 771                                                         $this->getRevIdFetched(),
 772                                                         $useParserCache,
 773                                                         $rev,
 774                                                         // permission checking was done earlier via showDeletedRevisionHeader()
 775                                                         RevisionRecord::RAW
 776                                                 );
 777                                                 $ok = $poolArticleView->execute();
 778                                                 $error = $poolArticleView->getError();
 779                                                 $this->mParserOutput = $poolArticleView->getParserOutput() ?: null;
 780
 781                                                 # Don't cache a dirty ParserOutput object
 782                                                 if ( $poolArticleView->getIsDirty() ) {
 783                                                         $outputPage->setCdnMaxage( 0 );
 784                                                         $outputPage->addHTML( "<!-- parser cache is expired, " .
 785                                                                 "sending anyway due to pool overload-->\n" );
 786                                                 }
 787                                         } else {
 788                                                 $ok = false;
 789                                         }
 790
 791                                         if ( !$ok ) {
 792                                                 if ( $error ) {
 793                                                         $outputPage->clearHTML(); // for release() errors
 794                                                         $outputPage->enableClientCache( false );
 795                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 796
 797                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 798                                                         $outputPage->wrapWikiTextAsInterface( 'errorbox', $errortext );
 799                                                 }
 800                                                 # Connection or timeout error
 801                                                 return;
 802                                         }
 803
 804                                         if ( $this->mParserOutput ) {
 805                                                 $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 806                                         }
 807
 808                                         if ( $rev && $this->getRevisionRedirectTarget( $rev ) ) {
 809                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 810                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 811                                         }
 812
 813                                         $outputDone = true;
 814                                         break;
 815                                 # Should be unreachable, but just in case...
 816                                 default:
 817                                         break 2;
 818                         }
 819                 }
 820
 821                 // Get the ParserOutput actually *displayed* here.
 822                 // Note that $this->mParserOutput is the *current*/oldid version output.
 823                 // Note that the ArticleViewHeader hook is allowed to set $outputDone to a
 824                 // ParserOutput instance.
 825                 $pOutput = ( $outputDone instanceof ParserOutput )
 826                         ? $outputDone // object fetched by hook
 827                         : ( $this->mParserOutput ?: null ); // ParserOutput or null, avoid false
 828
 829                 # Adjust title for main page & pages with displaytitle
 830                 if ( $pOutput ) {
 831                         $this->adjustDisplayTitle( $pOutput );
 832                 }
 833
 834                 # For the main page, overwrite the <title> element with the con-
 835                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 836                 # that's not empty).
 837                 # This message always exists because it is in the i18n files
 838                 if ( $this->getTitle()->isMainPage() ) {
 839                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 840                         if ( !$msg->isDisabled() ) {
 841                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 842                         }
 843                 }
 844
 845                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 846                 # This could use getTouched(), but that could be scary for major template edits.
 847                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 848
 849                 # Check for any __NOINDEX__ tags on the page using $pOutput
 850                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 851                 $outputPage->setIndexPolicy( $policy['index'] );
 852                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 853
 854                 $this->showViewFooter();
 855                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 856
 857                 # Load the postEdit module if the user just saved this revision
 858                 # See also EditPage::setPostEditCookie
 859                 $request = $this->getContext()->getRequest();
 860                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 861                 $postEdit = $request->getCookie( $cookieKey );
 862                 if ( $postEdit ) {
 863                         # Clear the cookie. This also prevents caching of the response.
 864                         $request->response()->clearCookie( $cookieKey );
 865                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 866                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 867                 }
 868         }
 869
 870         /**
 871          * @param RevisionRecord $revision
 872          * @return null|Title
 873          */
 874         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 875                 // TODO: find a *good* place for the code that determines the redirect target for
 876                 // a given revision!
 877                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 878                 $content = $revision->getContent( SlotRecord::MAIN );
 879                 return $content ? $content->getRedirectTarget() : null;
 880         }
 881
 882         /**
 883          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 884          * @param ParserOutput $pOutput
 885          */
 886         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 887                 $out = $this->getContext()->getOutput();
 888
 889                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 890                 $titleText = $pOutput->getTitleText();
 891                 if ( strval( $titleText ) !== '' ) {
 892                         $out->setPageTitle( $titleText );
 893                         $out->setDisplayTitle( $titleText );
 894                 }
 895         }
 896
 897         /**
 898          * Show a diff page according to current request variables. For use within
 899          * Article::view() only, other callers should use the DifferenceEngine class.
 900          */
 901         protected function showDiffPage() {
 902                 $request = $this->getContext()->getRequest();
 903                 $user = $this->getContext()->getUser();
 904                 $diff = $request->getVal( 'diff' );
 905                 $rcid = $request->getVal( 'rcid' );
 906                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 907                 $purge = $request->getVal( 'action' ) == 'purge';
 908                 $unhide = $request->getInt( 'unhide' ) == 1;
 909                 $oldid = $this->getOldID();
 910
 911                 $rev = $this->getRevisionFetched();
 912
 913                 if ( !$rev ) {
 914                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 915                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 916                                 ->params( $oldid )
 917                                 ->numParams( 1 )
 918                                 ->parseAsBlock();
 919                         $this->getContext()->getOutput()->addHTML( $msg );
 920                         return;
 921                 }
 922
 923                 $contentHandler = $rev->getContentHandler();
 924                 $de = $contentHandler->createDifferenceEngine(
 925                         $this->getContext(),
 926                         $oldid,
 927                         $diff,
 928                         $rcid,
 929                         $purge,
 930                         $unhide
 931                 );
 932
 933                 // DifferenceEngine directly fetched the revision:
 934                 $this->mRevIdFetched = $de->getNewid();
 935                 $de->showDiffPage( $diffOnly );
 936
 937                 // Run view updates for the newer revision being diffed (and shown
 938                 // below the diff if not $diffOnly).
 939                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 940                 // New can be false, convert it to 0 - this conveniently means the latest revision
 941                 $this->mPage->doViewUpdates( $user, (int)$new );
 942         }
 943
 944         /**
 945          * Get the robot policy to be used for the current view
 946          * @param string $action The action= GET parameter
 947          * @param ParserOutput|null $pOutput
 948          * @return array The policy that should be set
 949          * @todo actions other than 'view'
 950          */
 951         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 952                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 953
 954                 $ns = $this->getTitle()->getNamespace();
 955
 956                 # Don't index user and user talk pages for blocked users (T13443)
 957                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 958                         $specificTarget = null;
 959                         $vagueTarget = null;
 960                         $titleText = $this->getTitle()->getText();
 961                         if ( IP::isValid( $titleText ) ) {
 962                                 $vagueTarget = $titleText;
 963                         } else {
 964                                 $specificTarget = $titleText;
 965                         }
 966                         if ( DatabaseBlock::newFromTarget( $specificTarget, $vagueTarget ) instanceof DatabaseBlock ) {
 967                                 return [
 968                                         'index' => 'noindex',
 969                                         'follow' => 'nofollow'
 970                                 ];
 971                         }
 972                 }
 973
 974                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 975                         # Non-articles (special pages etc), and old revisions
 976                         return [
 977                                 'index' => 'noindex',
 978                                 'follow' => 'nofollow'
 979                         ];
 980                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 981                         # Discourage indexing of printable versions, but encourage following
 982                         return [
 983                                 'index' => 'noindex',
 984                                 'follow' => 'follow'
 985                         ];
 986                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 987                         # For ?curid=x urls, disallow indexing
 988                         return [
 989                                 'index' => 'noindex',
 990                                 'follow' => 'follow'
 991                         ];
 992                 }
 993
 994                 # Otherwise, construct the policy based on the various config variables.
 995                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 996
 997                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 998                         # Honour customised robot policies for this namespace
 999                         $policy = array_merge(
1000                                 $policy,
1001                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1002                         );
1003                 }
1004                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1005                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1006                         # a final sanity check that we have really got the parser output.
1007                         $policy = array_merge(
1008                                 $policy,
1009                                 [ 'index' => $pOutput->getIndexPolicy() ]
1010                         );
1011                 }
1012
1013                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1014                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1015                         $policy = array_merge(
1016                                 $policy,
1017                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1018                         );
1019                 }
1020
1021                 return $policy;
1022         }
1023
1024         /**
1025          * Converts a String robot policy into an associative array, to allow
1026          * merging of several policies using array_merge().
1027          * @param array|string $policy Returns empty array on null/false/'', transparent
1028          *   to already-converted arrays, converts string.
1029          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1030          */
1031         public static function formatRobotPolicy( $policy ) {
1032                 if ( is_array( $policy ) ) {
1033                         return $policy;
1034                 } elseif ( !$policy ) {
1035                         return [];
1036                 }
1037
1038                 $policy = explode( ',', $policy );
1039                 $policy = array_map( 'trim', $policy );
1040
1041                 $arr = [];
1042                 foreach ( $policy as $var ) {
1043                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1044                                 $arr['index'] = $var;
1045                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1046                                 $arr['follow'] = $var;
1047                         }
1048                 }
1049
1050                 return $arr;
1051         }
1052
1053         /**
1054          * If this request is a redirect view, send "redirected from" subtitle to
1055          * the output. Returns true if the header was needed, false if this is not
1056          * a redirect view. Handles both local and remote redirects.
1057          *
1058          * @return bool
1059          */
1060         public function showRedirectedFromHeader() {
1061                 global $wgRedirectSources;
1062
1063                 $context = $this->getContext();
1064                 $outputPage = $context->getOutput();
1065                 $request = $context->getRequest();
1066                 $rdfrom = $request->getVal( 'rdfrom' );
1067
1068                 // Construct a URL for the current page view, but with the target title
1069                 $query = $request->getValues();
1070                 unset( $query['rdfrom'] );
1071                 unset( $query['title'] );
1072                 if ( $this->getTitle()->isRedirect() ) {
1073                         // Prevent double redirects
1074                         $query['redirect'] = 'no';
1075                 }
1076                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1077
1078                 if ( isset( $this->mRedirectedFrom ) ) {
1079                         // Avoid PHP 7.1 warning of passing $this by reference
1080                         $articlePage = $this;
1081
1082                         // This is an internally redirected page view.
1083                         // We'll need a backlink to the source page for navigation.
1084                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1085                                 $redir = Linker::linkKnown(
1086                                         $this->mRedirectedFrom,
1087                                         null,
1088                                         [],
1089                                         [ 'redirect' => 'no' ]
1090                                 );
1091
1092                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1093                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1094                                 . "</span>" );
1095
1096                                 // Add the script to update the displayed URL and
1097                                 // set the fragment if one was specified in the redirect
1098                                 $outputPage->addJsConfigVars( [
1099                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1100                                 ] );
1101                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1102
1103                                 // Add a <link rel="canonical"> tag
1104                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1105
1106                                 // Tell the output object that the user arrived at this article through a redirect
1107                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1108
1109                                 return true;
1110                         }
1111                 } elseif ( $rdfrom ) {
1112                         // This is an externally redirected view, from some other wiki.
1113                         // If it was reported from a trusted site, supply a backlink.
1114                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1115                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1116                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1117                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1118                                 . "</span>" );
1119
1120                                 // Add the script to update the displayed URL
1121                                 $outputPage->addJsConfigVars( [
1122                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1123                                 ] );
1124                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1125
1126                                 return true;
1127                         }
1128                 }
1129
1130                 return false;
1131         }
1132
1133         /**
1134          * Show a header specific to the namespace currently being viewed, like
1135          * [[MediaWiki:Talkpagetext]]. For Article::view().
1136          */
1137         public function showNamespaceHeader() {
1138                 if ( $this->getTitle()->isTalkPage() && !wfMessage( 'talkpageheader' )->isDisabled() ) {
1139                         $this->getContext()->getOutput()->wrapWikiMsg(
1140                                 "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1141                                 [ 'talkpageheader' ]
1142                         );
1143                 }
1144         }
1145
1146         /**
1147          * Show the footer section of an ordinary page view
1148          */
1149         public function showViewFooter() {
1150                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1151                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1152                         && IP::isValid( $this->getTitle()->getText() )
1153                 ) {
1154                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1155                 }
1156
1157                 // Show a footer allowing the user to patrol the shown revision or page if possible
1158                 $patrolFooterShown = $this->showPatrolFooter();
1159
1160                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1161         }
1162
1163         /**
1164          * If patrol is possible, output a patrol UI box. This is called from the
1165          * footer section of ordinary page views. If patrol is not possible or not
1166          * desired, does nothing.
1167          * Side effect: When the patrol link is build, this method will call
1168          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1169          *
1170          * @return bool
1171          */
1172         public function showPatrolFooter() {
1173                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1174
1175                 // Allow hooks to decide whether to not output this at all
1176                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1177                         return false;
1178                 }
1179
1180                 $outputPage = $this->getContext()->getOutput();
1181                 $user = $this->getContext()->getUser();
1182                 $title = $this->getTitle();
1183                 $rc = false;
1184
1185                 if ( !MediaWikiServices::getInstance()->getPermissionManager()
1186                                 ->quickUserCan( 'patrol', $user, $title )
1187                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1188                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1189                 ) {
1190                         // Patrolling is disabled or the user isn't allowed to
1191                         return false;
1192                 }
1193
1194                 if ( $this->mRevision
1195                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1196                 ) {
1197                         // The current revision is already older than what could be in the RC table
1198                         // 6h tolerance because the RC might not be cleaned out regularly
1199                         return false;
1200                 }
1201
1202                 // Check for cached results
1203                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1204                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1205                 if ( $cache->get( $key ) ) {
1206                         return false;
1207                 }
1208
1209                 $dbr = wfGetDB( DB_REPLICA );
1210                 $oldestRevisionTimestamp = $dbr->selectField(
1211                         'revision',
1212                         'MIN( rev_timestamp )',
1213                         [ 'rev_page' => $title->getArticleID() ],
1214                         __METHOD__
1215                 );
1216
1217                 // New page patrol: Get the timestamp of the oldest revison which
1218                 // the revision table holds for the given page. Then we look
1219                 // whether it's within the RC lifespan and if it is, we try
1220                 // to get the recentchanges row belonging to that entry
1221                 // (with rc_new = 1).
1222                 $recentPageCreation = false;
1223                 if ( $oldestRevisionTimestamp
1224                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1225                 ) {
1226                         // 6h tolerance because the RC might not be cleaned out regularly
1227                         $recentPageCreation = true;
1228                         $rc = RecentChange::newFromConds(
1229                                 [
1230                                         'rc_new' => 1,
1231                                         'rc_timestamp' => $oldestRevisionTimestamp,
1232                                         'rc_namespace' => $title->getNamespace(),
1233                                         'rc_cur_id' => $title->getArticleID()
1234                                 ],
1235                                 __METHOD__
1236                         );
1237                         if ( $rc ) {
1238                                 // Use generic patrol message for new pages
1239                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1240                         }
1241                 }
1242
1243                 // File patrol: Get the timestamp of the latest upload for this page,
1244                 // check whether it is within the RC lifespan and if it is, we try
1245                 // to get the recentchanges row belonging to that entry
1246                 // (with rc_type = RC_LOG, rc_log_type = upload).
1247                 $recentFileUpload = false;
1248                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1249                         && $title->getNamespace() === NS_FILE ) {
1250                         // Retrieve timestamp of most recent upload
1251                         $newestUploadTimestamp = $dbr->selectField(
1252                                 'image',
1253                                 'MAX( img_timestamp )',
1254                                 [ 'img_name' => $title->getDBkey() ],
1255                                 __METHOD__
1256                         );
1257                         if ( $newestUploadTimestamp
1258                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1259                         ) {
1260                                 // 6h tolerance because the RC might not be cleaned out regularly
1261                                 $recentFileUpload = true;
1262                                 $rc = RecentChange::newFromConds(
1263                                         [
1264                                                 'rc_type' => RC_LOG,
1265                                                 'rc_log_type' => 'upload',
1266                                                 'rc_timestamp' => $newestUploadTimestamp,
1267                                                 'rc_namespace' => NS_FILE,
1268                                                 'rc_cur_id' => $title->getArticleID()
1269                                         ],
1270                                         __METHOD__
1271                                 );
1272                                 if ( $rc ) {
1273                                         // Use patrol message specific to files
1274                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1275                                 }
1276                         }
1277                 }
1278
1279                 if ( !$recentPageCreation && !$recentFileUpload ) {
1280                         // Page creation and latest upload (for files) is too old to be in RC
1281
1282                         // We definitely can't patrol so cache the information
1283                         // When a new file version is uploaded, the cache is cleared
1284                         $cache->set( $key, '1' );
1285
1286                         return false;
1287                 }
1288
1289                 if ( !$rc ) {
1290                         // Don't cache: This can be hit if the page gets accessed very fast after
1291                         // its creation / latest upload or in case we have high replica DB lag. In case
1292                         // the revision is too old, we will already return above.
1293                         return false;
1294                 }
1295
1296                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1297                         // Patrolled RC entry around
1298
1299                         // Cache the information we gathered above in case we can't patrol
1300                         // Don't cache in case we can patrol as this could change
1301                         $cache->set( $key, '1' );
1302
1303                         return false;
1304                 }
1305
1306                 if ( $rc->getPerformer()->equals( $user ) ) {
1307                         // Don't show a patrol link for own creations/uploads. If the user could
1308                         // patrol them, they already would be patrolled
1309                         return false;
1310                 }
1311
1312                 $outputPage->preventClickjacking();
1313                 if ( MediaWikiServices::getInstance()
1314                                 ->getPermissionManager()
1315                                 ->userHasRight( $user, 'writeapi' )
1316                 ) {
1317                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1318                 }
1319
1320                 $link = Linker::linkKnown(
1321                         $title,
1322                         $markPatrolledMsg->escaped(),
1323                         [],
1324                         [
1325                                 'action' => 'markpatrolled',
1326                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1327                         ]
1328                 );
1329
1330                 $outputPage->addHTML(
1331                         "<div class='patrollink' data-mw='interface'>" .
1332                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1333                         '</div>'
1334                 );
1335
1336                 return true;
1337         }
1338
1339         /**
1340          * Purge the cache used to check if it is worth showing the patrol footer
1341          * For example, it is done during re-uploads when file patrol is used.
1342          * @param int $articleID ID of the article to purge
1343          * @since 1.27
1344          */
1345         public static function purgePatrolFooterCache( $articleID ) {
1346                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1347                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1348         }
1349
1350         /**
1351          * Show the error text for a missing article. For articles in the MediaWiki
1352          * namespace, show the default message text. To be called from Article::view().
1353          */
1354         public function showMissingArticle() {
1355                 global $wgSend404Code;
1356
1357                 $outputPage = $this->getContext()->getOutput();
1358                 // Whether the page is a root user page of an existing user (but not a subpage)
1359                 $validUserPage = false;
1360
1361                 $title = $this->getTitle();
1362
1363                 $services = MediaWikiServices::getInstance();
1364
1365                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1366                 if ( $title->getNamespace() == NS_USER
1367                         || $title->getNamespace() == NS_USER_TALK
1368                 ) {
1369                         $rootPart = explode( '/', $title->getText() )[0];
1370                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1371                         $ip = User::isIP( $rootPart );
1372                         $block = DatabaseBlock::newFromTarget( $user, $user );
1373
1374                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1375                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1376                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1377                         } elseif (
1378                                 !is_null( $block ) &&
1379                                 $block->getType() != DatabaseBlock::TYPE_AUTO &&
1380                                 ( $block->isSitewide() || $user->isBlockedFrom( $title ) )
1381                         ) {
1382                                 // Show log extract if the user is sitewide blocked or is partially
1383                                 // blocked and not allowed to edit their user page or user talk page
1384                                 LogEventsList::showLogExtract(
1385                                         $outputPage,
1386                                         'block',
1387                                         $services->getNamespaceInfo()->getCanonicalName( NS_USER ) . ':' .
1388                                                 $block->getTarget(),
1389                                         '',
1390                                         [
1391                                                 'lim' => 1,
1392                                                 'showIfEmpty' => false,
1393                                                 'msgKey' => [
1394                                                         'blocked-notice-logextract',
1395                                                         $user->getName() # Support GENDER in notice
1396                                                 ]
1397                                         ]
1398                                 );
1399                                 $validUserPage = !$title->isSubpage();
1400                         } else {
1401                                 $validUserPage = !$title->isSubpage();
1402                         }
1403                 }
1404
1405                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1406
1407                 # Show delete and move logs if there were any such events.
1408                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1409                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1410                 $dbCache = ObjectCache::getInstance( 'db-replicated' );
1411                 $key = $dbCache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1412                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1413                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1414                 if ( $loggedIn || $dbCache->get( $key ) || $sessionExists ) {
1415                         $logTypes = [ 'delete', 'move', 'protect' ];
1416
1417                         $dbr = wfGetDB( DB_REPLICA );
1418
1419                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1420                         // Give extensions a chance to hide their (unrelated) log entries
1421                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1422                         LogEventsList::showLogExtract(
1423                                 $outputPage,
1424                                 $logTypes,
1425                                 $title,
1426                                 '',
1427                                 [
1428                                         'lim' => 10,
1429                                         'conds' => $conds,
1430                                         'showIfEmpty' => false,
1431                                         'msgKey' => [ $loggedIn || $sessionExists
1432                                                 ? 'moveddeleted-notice'
1433                                                 : 'moveddeleted-notice-recent'
1434                                         ]
1435                                 ]
1436                         );
1437                 }
1438
1439                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1440                         // If there's no backing content, send a 404 Not Found
1441                         // for better machine handling of broken links.
1442                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1443                 }
1444
1445                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1446                 $policy = $this->getRobotPolicy( 'view' );
1447                 $outputPage->setIndexPolicy( $policy['index'] );
1448                 $outputPage->setFollowPolicy( $policy['follow'] );
1449
1450                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1451
1452                 if ( !$hookResult ) {
1453                         return;
1454                 }
1455
1456                 # Show error message
1457                 $oldid = $this->getOldID();
1458                 $pm = MediaWikiServices::getInstance()->getPermissionManager();
1459                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1460                         // use fake Content object for system message
1461                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1462                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1463                 } else {
1464                         if ( $oldid ) {
1465                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1466                         } elseif ( $pm->quickUserCan( 'create', $this->getContext()->getUser(), $title ) &&
1467                                 $pm->quickUserCan( 'edit', $this->getContext()->getUser(), $title )
1468                         ) {
1469                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1470                                 $text = wfMessage( $message )->plain();
1471                         } else {
1472                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1473                         }
1474
1475                         $dir = $this->getContext()->getLanguage()->getDir();
1476                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1477                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1478                                 'class' => "noarticletext mw-content-$dir",
1479                                 'dir' => $dir,
1480                                 'lang' => $lang,
1481                         ] ) . "\n$text\n</div>" );
1482                 }
1483         }
1484
1485         /**
1486          * If the revision requested for view is deleted, check permissions.
1487          * Send either an error message or a warning header to the output.
1488          *
1489          * @return bool True if the view is allowed, false if not.
1490          */
1491         public function showDeletedRevisionHeader() {
1492                 if ( !$this->mRevision->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
1493                         // Not deleted
1494                         return true;
1495                 }
1496
1497                 $outputPage = $this->getContext()->getOutput();
1498                 $user = $this->getContext()->getUser();
1499                 // If the user is not allowed to see it...
1500                 if ( !$this->mRevision->userCan( RevisionRecord::DELETED_TEXT, $user ) ) {
1501                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1502                                 'rev-deleted-text-permission' );
1503
1504                         return false;
1505                 // If the user needs to confirm that they want to see it...
1506                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1507                         # Give explanation and add a link to view the revision...
1508                         $oldid = intval( $this->getOldID() );
1509                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1510                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1511                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1512                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1513                                 [ $msg, $link ] );
1514
1515                         return false;
1516                 // We are allowed to see...
1517                 } else {
1518                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1519                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1520                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1521
1522                         return true;
1523                 }
1524         }
1525
1526         /**
1527          * Generate the navigation links when browsing through an article revisions
1528          * It shows the information as:
1529          *   Revision as of \<date\>; view current revision
1530          *   \<- Previous version | Next Version -\>
1531          *
1532          * @param int $oldid Revision ID of this article revision
1533          */
1534         public function setOldSubtitle( $oldid = 0 ) {
1535                 // Avoid PHP 7.1 warning of passing $this by reference
1536                 $articlePage = $this;
1537
1538                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1539                         return;
1540                 }
1541
1542                 $context = $this->getContext();
1543                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1544
1545                 # Cascade unhide param in links for easy deletion browsing
1546                 $extraParams = [];
1547                 if ( $unhide ) {
1548                         $extraParams['unhide'] = 1;
1549                 }
1550
1551                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1552                         $revision = $this->mRevision;
1553                 } else {
1554                         $revision = Revision::newFromId( $oldid );
1555                 }
1556
1557                 $timestamp = $revision->getTimestamp();
1558
1559                 $current = ( $oldid == $this->mPage->getLatest() );
1560                 $language = $context->getLanguage();
1561                 $user = $context->getUser();
1562
1563                 $td = $language->userTimeAndDate( $timestamp, $user );
1564                 $tddate = $language->userDate( $timestamp, $user );
1565                 $tdtime = $language->userTime( $timestamp, $user );
1566
1567                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1568                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1569
1570                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1571                         ? 'revision-info-current'
1572                         : 'revision-info';
1573
1574                 $outputPage = $context->getOutput();
1575                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1576                         $context->msg( $infomsg, $td )
1577                                 ->rawParams( $userlinks )
1578                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1579                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1580                                 ->parse() .
1581                         "</div>";
1582
1583                 $lnk = $current
1584                         ? $context->msg( 'currentrevisionlink' )->escaped()
1585                         : Linker::linkKnown(
1586                                 $this->getTitle(),
1587                                 $context->msg( 'currentrevisionlink' )->escaped(),
1588                                 [],
1589                                 $extraParams
1590                         );
1591                 $curdiff = $current
1592                         ? $context->msg( 'diff' )->escaped()
1593                         : Linker::linkKnown(
1594                                 $this->getTitle(),
1595                                 $context->msg( 'diff' )->escaped(),
1596                                 [],
1597                                 [
1598                                         'diff' => 'cur',
1599                                         'oldid' => $oldid
1600                                 ] + $extraParams
1601                         );
1602                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1603                 $prevlink = $prev
1604                         ? Linker::linkKnown(
1605                                 $this->getTitle(),
1606                                 $context->msg( 'previousrevision' )->escaped(),
1607                                 [],
1608                                 [
1609                                         'direction' => 'prev',
1610                                         'oldid' => $oldid
1611                                 ] + $extraParams
1612                         )
1613                         : $context->msg( 'previousrevision' )->escaped();
1614                 $prevdiff = $prev
1615                         ? Linker::linkKnown(
1616                                 $this->getTitle(),
1617                                 $context->msg( 'diff' )->escaped(),
1618                                 [],
1619                                 [
1620                                         'diff' => 'prev',
1621                                         'oldid' => $oldid
1622                                 ] + $extraParams
1623                         )
1624                         : $context->msg( 'diff' )->escaped();
1625                 $nextlink = $current
1626                         ? $context->msg( 'nextrevision' )->escaped()
1627                         : Linker::linkKnown(
1628                                 $this->getTitle(),
1629                                 $context->msg( 'nextrevision' )->escaped(),
1630                                 [],
1631                                 [
1632                                         'direction' => 'next',
1633                                         'oldid' => $oldid
1634                                 ] + $extraParams
1635                         );
1636                 $nextdiff = $current
1637                         ? $context->msg( 'diff' )->escaped()
1638                         : Linker::linkKnown(
1639                                 $this->getTitle(),
1640                                 $context->msg( 'diff' )->escaped(),
1641                                 [],
1642                                 [
1643                                         'diff' => 'next',
1644                                         'oldid' => $oldid
1645                                 ] + $extraParams
1646                         );
1647
1648                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1649                 if ( $cdel !== '' ) {
1650                         $cdel .= ' ';
1651                 }
1652
1653                 // the outer div is need for styling the revision info and nav in MobileFrontend
1654                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1655                         "<div id=\"mw-revision-nav\">" . $cdel .
1656                         $context->msg( 'revision-nav' )->rawParams(
1657                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1658                         )->escaped() . "</div></div>" );
1659         }
1660
1661         /**
1662          * Return the HTML for the top of a redirect page
1663          *
1664          * Chances are you should just be using the ParserOutput from
1665          * WikitextContent::getParserOutput instead of calling this for redirects.
1666          *
1667          * @param Title|array $target Destination(s) to redirect
1668          * @param bool $appendSubtitle [optional]
1669          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1670          * @return string Containing HTML with redirect link
1671          *
1672          * @deprecated since 1.30
1673          */
1674         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1675                 $lang = $this->getTitle()->getPageLanguage();
1676                 $out = $this->getContext()->getOutput();
1677                 if ( $appendSubtitle ) {
1678                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1679                 }
1680                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1681                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1682         }
1683
1684         /**
1685          * Return the HTML for the top of a redirect page
1686          *
1687          * Chances are you should just be using the ParserOutput from
1688          * WikitextContent::getParserOutput instead of calling this for redirects.
1689          *
1690          * @since 1.23
1691          * @param Language $lang
1692          * @param Title|array $target Destination(s) to redirect
1693          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1694          * @return string Containing HTML with redirect link
1695          */
1696         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1697                 if ( !is_array( $target ) ) {
1698                         $target = [ $target ];
1699                 }
1700
1701                 $html = '<ul class="redirectText">';
1702                 /** @var Title $title */
1703                 foreach ( $target as $title ) {
1704                         $html .= '<li>' . Linker::link(
1705                                 $title,
1706                                 htmlspecialchars( $title->getFullText() ),
1707                                 [],
1708                                 // Make sure wiki page redirects are not followed
1709                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1710                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1711                         ) . '</li>';
1712                 }
1713                 $html .= '</ul>';
1714
1715                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1716
1717                 return '<div class="redirectMsg">' .
1718                         '<p>' . $redirectToText . '</p>' .
1719                         $html .
1720                         '</div>';
1721         }
1722
1723         /**
1724          * Adds help link with an icon via page indicators.
1725          * Link target can be overridden by a local message containing a wikilink:
1726          * the message key is: 'namespace-' + namespace number + '-helppage'.
1727          * @param string $to Target MediaWiki.org page title or encoded URL.
1728          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1729          * @since 1.25
1730          */
1731         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1732                 $msg = wfMessage(
1733                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1734                 );
1735
1736                 $out = $this->getContext()->getOutput();
1737                 if ( !$msg->isDisabled() ) {
1738                         $helpUrl = Skin::makeUrl( $msg->plain() );
1739                         $out->addHelpLink( $helpUrl, true );
1740                 } else {
1741                         $out->addHelpLink( $to, $overrideBaseUrl );
1742                 }
1743         }
1744
1745         /**
1746          * Handle action=render
1747          */
1748         public function render() {
1749                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1750                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1751                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1752                 $this->viewIsRenderAction = true;
1753                 $this->view();
1754         }
1755
1756         /**
1757          * action=protect handler
1758          */
1759         public function protect() {
1760                 $form = new ProtectionForm( $this );
1761                 $form->execute();
1762         }
1763
1764         /**
1765          * action=unprotect handler (alias)
1766          */
1767         public function unprotect() {
1768                 $this->protect();
1769         }
1770
1771         /**
1772          * UI entry point for page deletion
1773          */
1774         public function delete() {
1775                 # This code desperately needs to be totally rewritten
1776
1777                 $title = $this->getTitle();
1778                 $context = $this->getContext();
1779                 $user = $context->getUser();
1780                 $request = $context->getRequest();
1781
1782                 # Check permissions
1783                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1784                 if ( count( $permissionErrors ) ) {
1785                         throw new PermissionsError( 'delete', $permissionErrors );
1786                 }
1787
1788                 # Read-only check...
1789                 if ( wfReadOnly() ) {
1790                         throw new ReadOnlyError;
1791                 }
1792
1793                 # Better double-check that it hasn't been deleted yet!
1794                 $this->mPage->loadPageData(
1795                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1796                 );
1797                 if ( !$this->mPage->exists() ) {
1798                         $deleteLogPage = new LogPage( 'delete' );
1799                         $outputPage = $context->getOutput();
1800                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1801                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1802                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1803                                 );
1804                         $outputPage->addHTML(
1805                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1806                         );
1807                         LogEventsList::showLogExtract(
1808                                 $outputPage,
1809                                 'delete',
1810                                 $title
1811                         );
1812
1813                         return;
1814                 }
1815
1816                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1817                 $deleteReason = $request->getText( 'wpReason' );
1818
1819                 if ( $deleteReasonList == 'other' ) {
1820                         $reason = $deleteReason;
1821                 } elseif ( $deleteReason != '' ) {
1822                         // Entry from drop down menu + additional comment
1823                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1824                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1825                 } else {
1826                         $reason = $deleteReasonList;
1827                 }
1828
1829                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1830                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1831                 ) {
1832                         # Flag to hide all contents of the archived revisions
1833
1834                         $suppress = $request->getCheck( 'wpSuppress' ) && MediaWikiServices::getInstance()
1835                                         ->getPermissionManager()
1836                                         ->userHasRight( $user, 'suppressrevision' );
1837
1838                         $this->doDelete( $reason, $suppress );
1839
1840                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1841
1842                         return;
1843                 }
1844
1845                 // Generate deletion reason
1846                 $hasHistory = false;
1847                 if ( !$reason ) {
1848                         try {
1849                                 $reason = $this->generateReason( $hasHistory );
1850                         } catch ( Exception $e ) {
1851                                 # if a page is horribly broken, we still want to be able to
1852                                 # delete it. So be lenient about errors here.
1853                                 wfDebug( "Error while building auto delete summary: $e" );
1854                                 $reason = '';
1855                         }
1856                 }
1857
1858                 // If the page has a history, insert a warning
1859                 if ( $hasHistory ) {
1860                         $title = $this->getTitle();
1861
1862                         // The following can use the real revision count as this is only being shown for users
1863                         // that can delete this page.
1864                         // This, as a side-effect, also makes sure that the following query isn't being run for
1865                         // pages with a larger history, unless the user has the 'bigdelete' right
1866                         // (and is about to delete this page).
1867                         $dbr = wfGetDB( DB_REPLICA );
1868                         $revisions = $edits = (int)$dbr->selectField(
1869                                 'revision',
1870                                 'COUNT(rev_page)',
1871                                 [ 'rev_page' => $title->getArticleID() ],
1872                                 __METHOD__
1873                         );
1874
1875                         // @todo i18n issue/patchwork message
1876                         $context->getOutput()->addHTML(
1877                                 '<strong class="mw-delete-warning-revisions">' .
1878                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1879                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1880                                         $context->msg( 'history' )->escaped(),
1881                                         [],
1882                                         [ 'action' => 'history' ] ) .
1883                                 '</strong>'
1884                         );
1885
1886                         if ( $title->isBigDeletion() ) {
1887                                 global $wgDeleteRevisionsLimit;
1888                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1889                                         [
1890                                                 'delete-warning-toobig',
1891                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1892                                         ]
1893                                 );
1894                         }
1895                 }
1896
1897                 $this->confirmDelete( $reason );
1898         }
1899
1900         /**
1901          * Output deletion confirmation dialog
1902          * @todo Move to another file?
1903          * @param string $reason Prefilled reason
1904          */
1905         public function confirmDelete( $reason ) {
1906                 wfDebug( "Article::confirmDelete\n" );
1907
1908                 $title = $this->getTitle();
1909                 $ctx = $this->getContext();
1910                 $outputPage = $ctx->getOutput();
1911                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1912                 $outputPage->addBacklinkSubtitle( $title );
1913                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1914                 $outputPage->addModules( 'mediawiki.action.delete' );
1915
1916                 $backlinkCache = $title->getBacklinkCache();
1917                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1918                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1919                                 'deleting-backlinks-warning' );
1920                 }
1921
1922                 $subpageQueryLimit = 51;
1923                 $subpages = $title->getSubpages( $subpageQueryLimit );
1924                 $subpageCount = count( $subpages );
1925                 if ( $subpageCount > 0 ) {
1926                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1927                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1928                 }
1929                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1930
1931                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1932
1933                 $user = $this->getContext()->getUser();
1934                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1935
1936                 $outputPage->enableOOUI();
1937
1938                 $fields = [];
1939
1940                 $options = Xml::listDropDownOptions(
1941                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1942                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1943                 );
1944                 $options = Xml::listDropDownOptionsOoui( $options );
1945
1946                 $fields[] = new OOUI\FieldLayout(
1947                         new OOUI\DropdownInputWidget( [
1948                                 'name' => 'wpDeleteReasonList',
1949                                 'inputId' => 'wpDeleteReasonList',
1950                                 'tabIndex' => 1,
1951                                 'infusable' => true,
1952                                 'value' => '',
1953                                 'options' => $options
1954                         ] ),
1955                         [
1956                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1957                                 'align' => 'top',
1958                         ]
1959                 );
1960
1961                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1962                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1963                 // Unicode codepoints.
1964                 $fields[] = new OOUI\FieldLayout(
1965                         new OOUI\TextInputWidget( [
1966                                 'name' => 'wpReason',
1967                                 'inputId' => 'wpReason',
1968                                 'tabIndex' => 2,
1969                                 'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
1970                                 'infusable' => true,
1971                                 'value' => $reason,
1972                                 'autofocus' => true,
1973                         ] ),
1974                         [
1975                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1976                                 'align' => 'top',
1977                         ]
1978                 );
1979
1980                 if ( $user->isLoggedIn() ) {
1981                         $fields[] = new OOUI\FieldLayout(
1982                                 new OOUI\CheckboxInputWidget( [
1983                                         'name' => 'wpWatch',
1984                                         'inputId' => 'wpWatch',
1985                                         'tabIndex' => 3,
1986                                         'selected' => $checkWatch,
1987                                 ] ),
1988                                 [
1989                                         'label' => $ctx->msg( 'watchthis' )->text(),
1990                                         'align' => 'inline',
1991                                         'infusable' => true,
1992                                 ]
1993                         );
1994                 }
1995                 $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
1996                 if ( $permissionManager->userHasRight( $user, 'suppressrevision' ) ) {
1997                         $fields[] = new OOUI\FieldLayout(
1998                                 new OOUI\CheckboxInputWidget( [
1999                                         'name' => 'wpSuppress',
2000                                         'inputId' => 'wpSuppress',
2001                                         'tabIndex' => 4,
2002                                 ] ),
2003                                 [
2004                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
2005                                         'align' => 'inline',
2006                                         'infusable' => true,
2007                                 ]
2008                         );
2009                 }
2010
2011                 $fields[] = new OOUI\FieldLayout(
2012                         new OOUI\ButtonInputWidget( [
2013                                 'name' => 'wpConfirmB',
2014                                 'inputId' => 'wpConfirmB',
2015                                 'tabIndex' => 5,
2016                                 'value' => $ctx->msg( 'deletepage' )->text(),
2017                                 'label' => $ctx->msg( 'deletepage' )->text(),
2018                                 'flags' => [ 'primary', 'destructive' ],
2019                                 'type' => 'submit',
2020                         ] ),
2021                         [
2022                                 'align' => 'top',
2023                         ]
2024                 );
2025
2026                 $fieldset = new OOUI\FieldsetLayout( [
2027                         'label' => $ctx->msg( 'delete-legend' )->text(),
2028                         'id' => 'mw-delete-table',
2029                         'items' => $fields,
2030                 ] );
2031
2032                 $form = new OOUI\FormLayout( [
2033                         'method' => 'post',
2034                         'action' => $title->getLocalURL( 'action=delete' ),
2035                         'id' => 'deleteconfirm',
2036                 ] );
2037                 $form->appendContent(
2038                         $fieldset,
2039                         new OOUI\HtmlSnippet(
2040                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2041                         )
2042                 );
2043
2044                 $outputPage->addHTML(
2045                         new OOUI\PanelLayout( [
2046                                 'classes' => [ 'deletepage-wrapper' ],
2047                                 'expanded' => false,
2048                                 'padded' => true,
2049                                 'framed' => true,
2050                                 'content' => $form,
2051                         ] )
2052                 );
2053
2054                 if ( $permissionManager->userHasRight( $user, 'editinterface' ) ) {
2055                         $link = Linker::linkKnown(
2056                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2057                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2058                                 [],
2059                                 [ 'action' => 'edit' ]
2060                         );
2061                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2062                 }
2063
2064                 $deleteLogPage = new LogPage( 'delete' );
2065                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2066                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2067         }
2068
2069         /**
2070          * Perform a deletion and output success or failure messages
2071          * @param string $reason
2072          * @param bool $suppress
2073          * @param bool $immediate false allows deleting over time via the job queue
2074          * @throws FatalError
2075          * @throws MWException
2076          */
2077         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2078                 $error = '';
2079                 $context = $this->getContext();
2080                 $outputPage = $context->getOutput();
2081                 $user = $context->getUser();
2082                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2083                         [], 'delete', $immediate );
2084
2085                 if ( $status->isOK() ) {
2086                         $deleted = $this->getTitle()->getPrefixedText();
2087
2088                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2089                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2090
2091                         if ( $status->isGood() ) {
2092                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2093                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2094                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2095                         } else {
2096                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2097                         }
2098
2099                         $outputPage->returnToMain( false );
2100                 } else {
2101                         $outputPage->setPageTitle(
2102                                 wfMessage( 'cannotdelete-title',
2103                                         $this->getTitle()->getPrefixedText() )
2104                         );
2105
2106                         if ( $error == '' ) {
2107                                 $outputPage->wrapWikiTextAsInterface(
2108                                         'error mw-error-cannotdelete',
2109                                         $status->getWikiText()
2110                                 );
2111                                 $deleteLogPage = new LogPage( 'delete' );
2112                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2113
2114                                 LogEventsList::showLogExtract(
2115                                         $outputPage,
2116                                         'delete',
2117                                         $this->getTitle()
2118                                 );
2119                         } else {
2120                                 $outputPage->addHTML( $error );
2121                         }
2122                 }
2123         }
2124
2125         /* Caching functions */
2126
2127         /**
2128          * checkLastModified returns true if it has taken care of all
2129          * output to the client that is necessary for this request.
2130          * (that is, it has sent a cached version of the page)
2131          *
2132          * @return bool True if cached version send, false otherwise
2133          */
2134         protected function tryFileCache() {
2135                 static $called = false;
2136
2137                 if ( $called ) {
2138                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2139                         return false;
2140                 }
2141
2142                 $called = true;
2143                 if ( $this->isFileCacheable() ) {
2144                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2145                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2146                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2147                                 $cache->loadFromFileCache( $this->getContext() );
2148                                 return true;
2149                         } else {
2150                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2151                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2152                         }
2153                 } else {
2154                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2155                 }
2156
2157                 return false;
2158         }
2159
2160         /**
2161          * Check if the page can be cached
2162          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2163          * @return bool
2164          */
2165         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2166                 $cacheable = false;
2167
2168                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2169                         $cacheable = $this->mPage->getId()
2170                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2171                         // Extension may have reason to disable file caching on some pages.
2172                         if ( $cacheable ) {
2173                                 // Avoid PHP 7.1 warning of passing $this by reference
2174                                 $articlePage = $this;
2175                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2176                         }
2177                 }
2178
2179                 return $cacheable;
2180         }
2181
2182         /** #@- */
2183
2184         /**
2185          * Lightweight method to get the parser output for a page, checking the parser cache
2186          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2187          * consider, so it's not appropriate to use there.
2188          *
2189          * @since 1.16 (r52326) for LiquidThreads
2190          *
2191          * @param int|null $oldid Revision ID or null
2192          * @param User|null $user The relevant user
2193          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2194          */
2195         public function getParserOutput( $oldid = null, User $user = null ) {
2196                 // XXX: bypasses mParserOptions and thus setParserOptions()
2197
2198                 if ( $user === null ) {
2199                         $parserOptions = $this->getParserOptions();
2200                 } else {
2201                         $parserOptions = $this->mPage->makeParserOptions( $user );
2202                 }
2203
2204                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2205         }
2206
2207         /**
2208          * Override the ParserOptions used to render the primary article wikitext.
2209          *
2210          * @param ParserOptions $options
2211          * @throws MWException If the parser options where already initialized.
2212          */
2213         public function setParserOptions( ParserOptions $options ) {
2214                 if ( $this->mParserOptions ) {
2215                         throw new MWException( "can't change parser options after they have already been set" );
2216                 }
2217
2218                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2219                 $this->mParserOptions = clone $options;
2220         }
2221
2222         /**
2223          * Get parser options suitable for rendering the primary article wikitext
2224          * @return ParserOptions
2225          */
2226         public function getParserOptions() {
2227                 if ( !$this->mParserOptions ) {
2228                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2229                 }
2230                 // Clone to allow modifications of the return value without affecting cache
2231                 return clone $this->mParserOptions;
2232         }
2233
2234         /**
2235          * Sets the context this Article is executed in
2236          *
2237          * @param IContextSource $context
2238          * @since 1.18
2239          */
2240         public function setContext( $context ) {
2241                 $this->mContext = $context;
2242         }
2243
2244         /**
2245          * Gets the context this Article is executed in
2246          *
2247          * @return IContextSource
2248          * @since 1.18
2249          */
2250         public function getContext() {
2251                 if ( $this->mContext instanceof IContextSource ) {
2252                         return $this->mContext;
2253                 } else {
2254                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2255                                 "Return RequestContext::getMain(); for sanity\n" );
2256                         return RequestContext::getMain();
2257                 }
2258         }
2259
2260         /**
2261          * Use PHP's magic __get handler to handle accessing of
2262          * raw WikiPage fields for backwards compatibility.
2263          *
2264          * @param string $fname Field name
2265          * @return mixed
2266          */
2267         public function __get( $fname ) {
2268                 if ( property_exists( $this->mPage, $fname ) ) {
2269                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2270                         return $this->mPage->$fname;
2271                 }
2272                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2273         }
2274
2275         /**
2276          * Use PHP's magic __set handler to handle setting of
2277          * raw WikiPage fields for backwards compatibility.
2278          *
2279          * @param string $fname Field name
2280          * @param mixed $fvalue New value
2281          */
2282         public function __set( $fname, $fvalue ) {
2283                 if ( property_exists( $this->mPage, $fname ) ) {
2284                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2285                         $this->mPage->$fname = $fvalue;
2286                 // Note: extensions may want to toss on new fields
2287                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2288                         $this->mPage->$fname = $fvalue;
2289                 } else {
2290                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2291                 }
2292         }
2293
2294         /**
2295          * Call to WikiPage function for backwards compatibility.
2296          * @see WikiPage::checkFlags
2297          */
2298         public function checkFlags( $flags ) {
2299                 return $this->mPage->checkFlags( $flags );
2300         }
2301
2302         /**
2303          * Call to WikiPage function for backwards compatibility.
2304          * @see WikiPage::checkTouched
2305          */
2306         public function checkTouched() {
2307                 return $this->mPage->checkTouched();
2308         }
2309
2310         /**
2311          * Call to WikiPage function for backwards compatibility.
2312          * @see WikiPage::clearPreparedEdit
2313          */
2314         public function clearPreparedEdit() {
2315                 $this->mPage->clearPreparedEdit();
2316         }
2317
2318         /**
2319          * Call to WikiPage function for backwards compatibility.
2320          * @see WikiPage::doDeleteArticleReal
2321          */
2322         public function doDeleteArticleReal(
2323                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2324                 $tags = [], $immediate = false
2325         ) {
2326                 return $this->mPage->doDeleteArticleReal(
2327                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2328                 );
2329         }
2330
2331         /**
2332          * Call to WikiPage function for backwards compatibility.
2333          * @see WikiPage::doDeleteUpdates
2334          */
2335         public function doDeleteUpdates(
2336                 $id,
2337                 Content $content = null,
2338                 $revision = null,
2339                 User $user = null
2340         ) {
2341                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2342         }
2343
2344         /**
2345          * Call to WikiPage function for backwards compatibility.
2346          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2347          * @see WikiPage::doEditContent
2348          */
2349         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2350                 User $user = null, $serialFormat = null
2351         ) {
2352                 wfDeprecated( __METHOD__, '1.29' );
2353                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2354                         $user, $serialFormat
2355                 );
2356         }
2357
2358         /**
2359          * Call to WikiPage function for backwards compatibility.
2360          * @see WikiPage::doEditUpdates
2361          */
2362         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2363                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2364         }
2365
2366         /**
2367          * Call to WikiPage function for backwards compatibility.
2368          * @see WikiPage::doPurge
2369          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2370          *  controlled how much purging was done.
2371          */
2372         public function doPurge() {
2373                 return $this->mPage->doPurge();
2374         }
2375
2376         /**
2377          * Call to WikiPage function for backwards compatibility.
2378          * @see WikiPage::doViewUpdates
2379          */
2380         public function doViewUpdates( User $user, $oldid = 0 ) {
2381                 $this->mPage->doViewUpdates( $user, $oldid );
2382         }
2383
2384         /**
2385          * Call to WikiPage function for backwards compatibility.
2386          * @see WikiPage::exists
2387          */
2388         public function exists() {
2389                 return $this->mPage->exists();
2390         }
2391
2392         /**
2393          * Call to WikiPage function for backwards compatibility.
2394          * @see WikiPage::followRedirect
2395          */
2396         public function followRedirect() {
2397                 return $this->mPage->followRedirect();
2398         }
2399
2400         /**
2401          * Call to WikiPage function for backwards compatibility.
2402          * @see ContentHandler::getActionOverrides
2403          */
2404         public function getActionOverrides() {
2405                 return $this->mPage->getActionOverrides();
2406         }
2407
2408         /**
2409          * Call to WikiPage function for backwards compatibility.
2410          * @see WikiPage::getAutoDeleteReason
2411          */
2412         public function getAutoDeleteReason( &$hasHistory ) {
2413                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2414         }
2415
2416         /**
2417          * Call to WikiPage function for backwards compatibility.
2418          * @see WikiPage::getCategories
2419          */
2420         public function getCategories() {
2421                 return $this->mPage->getCategories();
2422         }
2423
2424         /**
2425          * Call to WikiPage function for backwards compatibility.
2426          * @see WikiPage::getComment
2427          */
2428         public function getComment( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2429                 return $this->mPage->getComment( $audience, $user );
2430         }
2431
2432         /**
2433          * Call to WikiPage function for backwards compatibility.
2434          * @see WikiPage::getContentHandler
2435          */
2436         public function getContentHandler() {
2437                 return $this->mPage->getContentHandler();
2438         }
2439
2440         /**
2441          * Call to WikiPage function for backwards compatibility.
2442          * @see WikiPage::getContentModel
2443          */
2444         public function getContentModel() {
2445                 return $this->mPage->getContentModel();
2446         }
2447
2448         /**
2449          * Call to WikiPage function for backwards compatibility.
2450          * @see WikiPage::getContributors
2451          */
2452         public function getContributors() {
2453                 return $this->mPage->getContributors();
2454         }
2455
2456         /**
2457          * Call to WikiPage function for backwards compatibility.
2458          * @see WikiPage::getCreator
2459          */
2460         public function getCreator( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2461                 return $this->mPage->getCreator( $audience, $user );
2462         }
2463
2464         /**
2465          * Call to WikiPage function for backwards compatibility.
2466          * @see WikiPage::getDeletionUpdates
2467          */
2468         public function getDeletionUpdates( Content $content = null ) {
2469                 return $this->mPage->getDeletionUpdates( $content );
2470         }
2471
2472         /**
2473          * Call to WikiPage function for backwards compatibility.
2474          * @see WikiPage::getHiddenCategories
2475          */
2476         public function getHiddenCategories() {
2477                 return $this->mPage->getHiddenCategories();
2478         }
2479
2480         /**
2481          * Call to WikiPage function for backwards compatibility.
2482          * @see WikiPage::getId
2483          */
2484         public function getId() {
2485                 return $this->mPage->getId();
2486         }
2487
2488         /**
2489          * Call to WikiPage function for backwards compatibility.
2490          * @see WikiPage::getLatest
2491          */
2492         public function getLatest() {
2493                 return $this->mPage->getLatest();
2494         }
2495
2496         /**
2497          * Call to WikiPage function for backwards compatibility.
2498          * @see WikiPage::getLinksTimestamp
2499          */
2500         public function getLinksTimestamp() {
2501                 return $this->mPage->getLinksTimestamp();
2502         }
2503
2504         /**
2505          * Call to WikiPage function for backwards compatibility.
2506          * @see WikiPage::getMinorEdit
2507          */
2508         public function getMinorEdit() {
2509                 return $this->mPage->getMinorEdit();
2510         }
2511
2512         /**
2513          * Call to WikiPage function for backwards compatibility.
2514          * @see WikiPage::getOldestRevision
2515          */
2516         public function getOldestRevision() {
2517                 return $this->mPage->getOldestRevision();
2518         }
2519
2520         /**
2521          * Call to WikiPage function for backwards compatibility.
2522          * @see WikiPage::getRedirectTarget
2523          */
2524         public function getRedirectTarget() {
2525                 return $this->mPage->getRedirectTarget();
2526         }
2527
2528         /**
2529          * Call to WikiPage function for backwards compatibility.
2530          * @see WikiPage::getRedirectURL
2531          */
2532         public function getRedirectURL( $rt ) {
2533                 return $this->mPage->getRedirectURL( $rt );
2534         }
2535
2536         /**
2537          * Call to WikiPage function for backwards compatibility.
2538          * @see WikiPage::getRevision
2539          */
2540         public function getRevision() {
2541                 return $this->mPage->getRevision();
2542         }
2543
2544         /**
2545          * Call to WikiPage function for backwards compatibility.
2546          * @see WikiPage::getTimestamp
2547          */
2548         public function getTimestamp() {
2549                 return $this->mPage->getTimestamp();
2550         }
2551
2552         /**
2553          * Call to WikiPage function for backwards compatibility.
2554          * @see WikiPage::getTouched
2555          */
2556         public function getTouched() {
2557                 return $this->mPage->getTouched();
2558         }
2559
2560         /**
2561          * Call to WikiPage function for backwards compatibility.
2562          * @see WikiPage::getUndoContent
2563          */
2564         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2565                 return $this->mPage->getUndoContent( $undo, $undoafter );
2566         }
2567
2568         /**
2569          * Call to WikiPage function for backwards compatibility.
2570          * @see WikiPage::getUser
2571          */
2572         public function getUser( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2573                 return $this->mPage->getUser( $audience, $user );
2574         }
2575
2576         /**
2577          * Call to WikiPage function for backwards compatibility.
2578          * @see WikiPage::getUserText
2579          */
2580         public function getUserText( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2581                 return $this->mPage->getUserText( $audience, $user );
2582         }
2583
2584         /**
2585          * Call to WikiPage function for backwards compatibility.
2586          * @see WikiPage::hasViewableContent
2587          */
2588         public function hasViewableContent() {
2589                 return $this->mPage->hasViewableContent();
2590         }
2591
2592         /**
2593          * Call to WikiPage function for backwards compatibility.
2594          * @see WikiPage::insertOn
2595          */
2596         public function insertOn( $dbw, $pageId = null ) {
2597                 return $this->mPage->insertOn( $dbw, $pageId );
2598         }
2599
2600         /**
2601          * Call to WikiPage function for backwards compatibility.
2602          * @see WikiPage::insertProtectNullRevision
2603          */
2604         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2605                 array $expiry, $cascade, $reason, $user = null
2606         ) {
2607                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2608                         $expiry, $cascade, $reason, $user
2609                 );
2610         }
2611
2612         /**
2613          * Call to WikiPage function for backwards compatibility.
2614          * @see WikiPage::insertRedirect
2615          */
2616         public function insertRedirect() {
2617                 return $this->mPage->insertRedirect();
2618         }
2619
2620         /**
2621          * Call to WikiPage function for backwards compatibility.
2622          * @see WikiPage::insertRedirectEntry
2623          */
2624         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2625                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2626         }
2627
2628         /**
2629          * Call to WikiPage function for backwards compatibility.
2630          * @see WikiPage::isCountable
2631          */
2632         public function isCountable( $editInfo = false ) {
2633                 return $this->mPage->isCountable( $editInfo );
2634         }
2635
2636         /**
2637          * Call to WikiPage function for backwards compatibility.
2638          * @see WikiPage::isRedirect
2639          */
2640         public function isRedirect() {
2641                 return $this->mPage->isRedirect();
2642         }
2643
2644         /**
2645          * Call to WikiPage function for backwards compatibility.
2646          * @see WikiPage::loadFromRow
2647          */
2648         public function loadFromRow( $data, $from ) {
2649                 return $this->mPage->loadFromRow( $data, $from );
2650         }
2651
2652         /**
2653          * Call to WikiPage function for backwards compatibility.
2654          * @see WikiPage::loadPageData
2655          */
2656         public function loadPageData( $from = 'fromdb' ) {
2657                 $this->mPage->loadPageData( $from );
2658         }
2659
2660         /**
2661          * Call to WikiPage function for backwards compatibility.
2662          * @see WikiPage::lockAndGetLatest
2663          */
2664         public function lockAndGetLatest() {
2665                 return $this->mPage->lockAndGetLatest();
2666         }
2667
2668         /**
2669          * Call to WikiPage function for backwards compatibility.
2670          * @see WikiPage::makeParserOptions
2671          */
2672         public function makeParserOptions( $context ) {
2673                 return $this->mPage->makeParserOptions( $context );
2674         }
2675
2676         /**
2677          * Call to WikiPage function for backwards compatibility.
2678          * @see WikiPage::pageDataFromId
2679          */
2680         public function pageDataFromId( $dbr, $id, $options = [] ) {
2681                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2682         }
2683
2684         /**
2685          * Call to WikiPage function for backwards compatibility.
2686          * @see WikiPage::pageDataFromTitle
2687          */
2688         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2689                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2690         }
2691
2692         /**
2693          * Call to WikiPage function for backwards compatibility.
2694          * @see WikiPage::prepareContentForEdit
2695          */
2696         public function prepareContentForEdit(
2697                 Content $content, $revision = null, User $user = null,
2698                 $serialFormat = null, $useCache = true
2699         ) {
2700                 return $this->mPage->prepareContentForEdit(
2701                         $content, $revision, $user,
2702                         $serialFormat, $useCache
2703                 );
2704         }
2705
2706         /**
2707          * Call to WikiPage function for backwards compatibility.
2708          * @see WikiPage::protectDescription
2709          */
2710         public function protectDescription( array $limit, array $expiry ) {
2711                 return $this->mPage->protectDescription( $limit, $expiry );
2712         }
2713
2714         /**
2715          * Call to WikiPage function for backwards compatibility.
2716          * @see WikiPage::protectDescriptionLog
2717          */
2718         public function protectDescriptionLog( array $limit, array $expiry ) {
2719                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2720         }
2721
2722         /**
2723          * Call to WikiPage function for backwards compatibility.
2724          * @see WikiPage::replaceSectionAtRev
2725          */
2726         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2727                 $sectionTitle = '', $baseRevId = null
2728         ) {
2729                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2730                         $sectionTitle, $baseRevId
2731                 );
2732         }
2733
2734         /**
2735          * Call to WikiPage function for backwards compatibility.
2736          * @see WikiPage::replaceSectionContent
2737          */
2738         public function replaceSectionContent(
2739                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2740         ) {
2741                 return $this->mPage->replaceSectionContent(
2742                         $sectionId, $sectionContent, $sectionTitle, $edittime
2743                 );
2744         }
2745
2746         /**
2747          * Call to WikiPage function for backwards compatibility.
2748          * @see WikiPage::setTimestamp
2749          */
2750         public function setTimestamp( $ts ) {
2751                 $this->mPage->setTimestamp( $ts );
2752         }
2753
2754         /**
2755          * Call to WikiPage function for backwards compatibility.
2756          * @see WikiPage::shouldCheckParserCache
2757          */
2758         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2759                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2760         }
2761
2762         /**
2763          * Call to WikiPage function for backwards compatibility.
2764          * @see WikiPage::supportsSections
2765          */
2766         public function supportsSections() {
2767                 return $this->mPage->supportsSections();
2768         }
2769
2770         /**
2771          * Call to WikiPage function for backwards compatibility.
2772          * @see WikiPage::triggerOpportunisticLinksUpdate
2773          */
2774         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2775                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2776         }
2777
2778         /**
2779          * Call to WikiPage function for backwards compatibility.
2780          * @see WikiPage::updateCategoryCounts
2781          */
2782         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2783                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2784         }
2785
2786         /**
2787          * Call to WikiPage function for backwards compatibility.
2788          * @see WikiPage::updateIfNewerOn
2789          */
2790         public function updateIfNewerOn( $dbw, $revision ) {
2791                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2792         }
2793
2794         /**
2795          * Call to WikiPage function for backwards compatibility.
2796          * @see WikiPage::updateRedirectOn
2797          */
2798         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2799                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2800         }
2801
2802         /**
2803          * Call to WikiPage function for backwards compatibility.
2804          * @see WikiPage::updateRevisionOn
2805          */
2806         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2807                 $lastRevIsRedirect = null
2808         ) {
2809                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2810                         $lastRevIsRedirect
2811                 );
2812         }
2813
2814         /**
2815          * @param array $limit
2816          * @param array $expiry
2817          * @param bool &$cascade
2818          * @param string $reason
2819          * @param User $user
2820          * @return Status
2821          */
2822         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2823                 $reason, User $user
2824         ) {
2825                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2826         }
2827
2828         /**
2829          * @param array $limit
2830          * @param string $reason
2831          * @param int &$cascade
2832          * @param array $expiry
2833          * @return bool
2834          */
2835         public function updateRestrictions( $limit = [], $reason = '',
2836                 &$cascade = 0, $expiry = []
2837         ) {
2838                 return $this->mPage->doUpdateRestrictions(
2839                         $limit,
2840                         $expiry,
2841                         $cascade,
2842                         $reason,
2843                         $this->getContext()->getUser()
2844                 );
2845         }
2846
2847         /**
2848          * @param string $reason
2849          * @param bool $suppress
2850          * @param int|null $u1 Unused
2851          * @param bool|null $u2 Unused
2852          * @param string &$error
2853          * @param bool $immediate false allows deleting over time via the job queue
2854          * @return bool
2855          * @throws FatalError
2856          * @throws MWException
2857          */
2858         public function doDeleteArticle(
2859                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2860         ) {
2861                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2862                         null, $immediate );
2863         }
2864
2865         /**
2866          * @param string $fromP
2867          * @param string $summary
2868          * @param string $token
2869          * @param bool $bot
2870          * @param array &$resultDetails
2871          * @param User|null $user
2872          * @return array
2873          */
2874         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2875                 if ( !$user ) {
2876                         $user = $this->getContext()->getUser();
2877                 }
2878
2879                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2880         }
2881
2882         /**
2883          * @param string $fromP
2884          * @param string $summary
2885          * @param bool $bot
2886          * @param array &$resultDetails
2887          * @param User|null $guser
2888          * @return array
2889          */
2890         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2891                 if ( !$guser ) {
2892                         $guser = $this->getContext()->getUser();
2893                 }
2894
2895                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2896         }
2897
2898         /**
2899          * @param bool &$hasHistory
2900          * @return mixed
2901          */
2902         public function generateReason( &$hasHistory ) {
2903                 $title = $this->mPage->getTitle();
2904                 $handler = ContentHandler::getForTitle( $title );
2905                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2906         }
2907
2908         // ******
2909 }