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 ( $user->isAllowed( 'writeapi' ) ) {
1314                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1315                 }
1316
1317                 $link = Linker::linkKnown(
1318                         $title,
1319                         $markPatrolledMsg->escaped(),
1320                         [],
1321                         [
1322                                 'action' => 'markpatrolled',
1323                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1324                         ]
1325                 );
1326
1327                 $outputPage->addHTML(
1328                         "<div class='patrollink' data-mw='interface'>" .
1329                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1330                         '</div>'
1331                 );
1332
1333                 return true;
1334         }
1335
1336         /**
1337          * Purge the cache used to check if it is worth showing the patrol footer
1338          * For example, it is done during re-uploads when file patrol is used.
1339          * @param int $articleID ID of the article to purge
1340          * @since 1.27
1341          */
1342         public static function purgePatrolFooterCache( $articleID ) {
1343                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1344                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1345         }
1346
1347         /**
1348          * Show the error text for a missing article. For articles in the MediaWiki
1349          * namespace, show the default message text. To be called from Article::view().
1350          */
1351         public function showMissingArticle() {
1352                 global $wgSend404Code;
1353
1354                 $outputPage = $this->getContext()->getOutput();
1355                 // Whether the page is a root user page of an existing user (but not a subpage)
1356                 $validUserPage = false;
1357
1358                 $title = $this->getTitle();
1359
1360                 $services = MediaWikiServices::getInstance();
1361
1362                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1363                 if ( $title->getNamespace() == NS_USER
1364                         || $title->getNamespace() == NS_USER_TALK
1365                 ) {
1366                         $rootPart = explode( '/', $title->getText() )[0];
1367                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1368                         $ip = User::isIP( $rootPart );
1369                         $block = DatabaseBlock::newFromTarget( $user, $user );
1370
1371                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1372                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1373                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1374                         } elseif (
1375                                 !is_null( $block ) &&
1376                                 $block->getType() != DatabaseBlock::TYPE_AUTO &&
1377                                 ( $block->isSitewide() || $user->isBlockedFrom( $title ) )
1378                         ) {
1379                                 // Show log extract if the user is sitewide blocked or is partially
1380                                 // blocked and not allowed to edit their user page or user talk page
1381                                 LogEventsList::showLogExtract(
1382                                         $outputPage,
1383                                         'block',
1384                                         $services->getNamespaceInfo()->getCanonicalName( NS_USER ) . ':' .
1385                                                 $block->getTarget(),
1386                                         '',
1387                                         [
1388                                                 'lim' => 1,
1389                                                 'showIfEmpty' => false,
1390                                                 'msgKey' => [
1391                                                         'blocked-notice-logextract',
1392                                                         $user->getName() # Support GENDER in notice
1393                                                 ]
1394                                         ]
1395                                 );
1396                                 $validUserPage = !$title->isSubpage();
1397                         } else {
1398                                 $validUserPage = !$title->isSubpage();
1399                         }
1400                 }
1401
1402                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1403
1404                 # Show delete and move logs if there were any such events.
1405                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1406                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1407                 $dbCache = ObjectCache::getInstance( 'db-replicated' );
1408                 $key = $dbCache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1409                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1410                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1411                 if ( $loggedIn || $dbCache->get( $key ) || $sessionExists ) {
1412                         $logTypes = [ 'delete', 'move', 'protect' ];
1413
1414                         $dbr = wfGetDB( DB_REPLICA );
1415
1416                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1417                         // Give extensions a chance to hide their (unrelated) log entries
1418                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1419                         LogEventsList::showLogExtract(
1420                                 $outputPage,
1421                                 $logTypes,
1422                                 $title,
1423                                 '',
1424                                 [
1425                                         'lim' => 10,
1426                                         'conds' => $conds,
1427                                         'showIfEmpty' => false,
1428                                         'msgKey' => [ $loggedIn || $sessionExists
1429                                                 ? 'moveddeleted-notice'
1430                                                 : 'moveddeleted-notice-recent'
1431                                         ]
1432                                 ]
1433                         );
1434                 }
1435
1436                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1437                         // If there's no backing content, send a 404 Not Found
1438                         // for better machine handling of broken links.
1439                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1440                 }
1441
1442                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1443                 $policy = $this->getRobotPolicy( 'view' );
1444                 $outputPage->setIndexPolicy( $policy['index'] );
1445                 $outputPage->setFollowPolicy( $policy['follow'] );
1446
1447                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1448
1449                 if ( !$hookResult ) {
1450                         return;
1451                 }
1452
1453                 # Show error message
1454                 $oldid = $this->getOldID();
1455                 $pm = MediaWikiServices::getInstance()->getPermissionManager();
1456                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1457                         // use fake Content object for system message
1458                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1459                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1460                 } else {
1461                         if ( $oldid ) {
1462                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1463                         } elseif ( $pm->quickUserCan( 'create', $this->getContext()->getUser(), $title ) &&
1464                                 $pm->quickUserCan( 'edit', $this->getContext()->getUser(), $title )
1465                         ) {
1466                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1467                                 $text = wfMessage( $message )->plain();
1468                         } else {
1469                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1470                         }
1471
1472                         $dir = $this->getContext()->getLanguage()->getDir();
1473                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1474                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1475                                 'class' => "noarticletext mw-content-$dir",
1476                                 'dir' => $dir,
1477                                 'lang' => $lang,
1478                         ] ) . "\n$text\n</div>" );
1479                 }
1480         }
1481
1482         /**
1483          * If the revision requested for view is deleted, check permissions.
1484          * Send either an error message or a warning header to the output.
1485          *
1486          * @return bool True if the view is allowed, false if not.
1487          */
1488         public function showDeletedRevisionHeader() {
1489                 if ( !$this->mRevision->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
1490                         // Not deleted
1491                         return true;
1492                 }
1493
1494                 $outputPage = $this->getContext()->getOutput();
1495                 $user = $this->getContext()->getUser();
1496                 // If the user is not allowed to see it...
1497                 if ( !$this->mRevision->userCan( RevisionRecord::DELETED_TEXT, $user ) ) {
1498                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1499                                 'rev-deleted-text-permission' );
1500
1501                         return false;
1502                 // If the user needs to confirm that they want to see it...
1503                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1504                         # Give explanation and add a link to view the revision...
1505                         $oldid = intval( $this->getOldID() );
1506                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1507                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1508                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1509                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1510                                 [ $msg, $link ] );
1511
1512                         return false;
1513                 // We are allowed to see...
1514                 } else {
1515                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1516                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1517                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1518
1519                         return true;
1520                 }
1521         }
1522
1523         /**
1524          * Generate the navigation links when browsing through an article revisions
1525          * It shows the information as:
1526          *   Revision as of \<date\>; view current revision
1527          *   \<- Previous version | Next Version -\>
1528          *
1529          * @param int $oldid Revision ID of this article revision
1530          */
1531         public function setOldSubtitle( $oldid = 0 ) {
1532                 // Avoid PHP 7.1 warning of passing $this by reference
1533                 $articlePage = $this;
1534
1535                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1536                         return;
1537                 }
1538
1539                 $context = $this->getContext();
1540                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1541
1542                 # Cascade unhide param in links for easy deletion browsing
1543                 $extraParams = [];
1544                 if ( $unhide ) {
1545                         $extraParams['unhide'] = 1;
1546                 }
1547
1548                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1549                         $revision = $this->mRevision;
1550                 } else {
1551                         $revision = Revision::newFromId( $oldid );
1552                 }
1553
1554                 $timestamp = $revision->getTimestamp();
1555
1556                 $current = ( $oldid == $this->mPage->getLatest() );
1557                 $language = $context->getLanguage();
1558                 $user = $context->getUser();
1559
1560                 $td = $language->userTimeAndDate( $timestamp, $user );
1561                 $tddate = $language->userDate( $timestamp, $user );
1562                 $tdtime = $language->userTime( $timestamp, $user );
1563
1564                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1565                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1566
1567                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1568                         ? 'revision-info-current'
1569                         : 'revision-info';
1570
1571                 $outputPage = $context->getOutput();
1572                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1573                         $context->msg( $infomsg, $td )
1574                                 ->rawParams( $userlinks )
1575                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1576                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1577                                 ->parse() .
1578                         "</div>";
1579
1580                 $lnk = $current
1581                         ? $context->msg( 'currentrevisionlink' )->escaped()
1582                         : Linker::linkKnown(
1583                                 $this->getTitle(),
1584                                 $context->msg( 'currentrevisionlink' )->escaped(),
1585                                 [],
1586                                 $extraParams
1587                         );
1588                 $curdiff = $current
1589                         ? $context->msg( 'diff' )->escaped()
1590                         : Linker::linkKnown(
1591                                 $this->getTitle(),
1592                                 $context->msg( 'diff' )->escaped(),
1593                                 [],
1594                                 [
1595                                         'diff' => 'cur',
1596                                         'oldid' => $oldid
1597                                 ] + $extraParams
1598                         );
1599                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1600                 $prevlink = $prev
1601                         ? Linker::linkKnown(
1602                                 $this->getTitle(),
1603                                 $context->msg( 'previousrevision' )->escaped(),
1604                                 [],
1605                                 [
1606                                         'direction' => 'prev',
1607                                         'oldid' => $oldid
1608                                 ] + $extraParams
1609                         )
1610                         : $context->msg( 'previousrevision' )->escaped();
1611                 $prevdiff = $prev
1612                         ? Linker::linkKnown(
1613                                 $this->getTitle(),
1614                                 $context->msg( 'diff' )->escaped(),
1615                                 [],
1616                                 [
1617                                         'diff' => 'prev',
1618                                         'oldid' => $oldid
1619                                 ] + $extraParams
1620                         )
1621                         : $context->msg( 'diff' )->escaped();
1622                 $nextlink = $current
1623                         ? $context->msg( 'nextrevision' )->escaped()
1624                         : Linker::linkKnown(
1625                                 $this->getTitle(),
1626                                 $context->msg( 'nextrevision' )->escaped(),
1627                                 [],
1628                                 [
1629                                         'direction' => 'next',
1630                                         'oldid' => $oldid
1631                                 ] + $extraParams
1632                         );
1633                 $nextdiff = $current
1634                         ? $context->msg( 'diff' )->escaped()
1635                         : Linker::linkKnown(
1636                                 $this->getTitle(),
1637                                 $context->msg( 'diff' )->escaped(),
1638                                 [],
1639                                 [
1640                                         'diff' => 'next',
1641                                         'oldid' => $oldid
1642                                 ] + $extraParams
1643                         );
1644
1645                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1646                 if ( $cdel !== '' ) {
1647                         $cdel .= ' ';
1648                 }
1649
1650                 // the outer div is need for styling the revision info and nav in MobileFrontend
1651                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1652                         "<div id=\"mw-revision-nav\">" . $cdel .
1653                         $context->msg( 'revision-nav' )->rawParams(
1654                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1655                         )->escaped() . "</div></div>" );
1656         }
1657
1658         /**
1659          * Return the HTML for the top of a redirect page
1660          *
1661          * Chances are you should just be using the ParserOutput from
1662          * WikitextContent::getParserOutput instead of calling this for redirects.
1663          *
1664          * @param Title|array $target Destination(s) to redirect
1665          * @param bool $appendSubtitle [optional]
1666          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1667          * @return string Containing HTML with redirect link
1668          *
1669          * @deprecated since 1.30
1670          */
1671         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1672                 $lang = $this->getTitle()->getPageLanguage();
1673                 $out = $this->getContext()->getOutput();
1674                 if ( $appendSubtitle ) {
1675                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1676                 }
1677                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1678                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1679         }
1680
1681         /**
1682          * Return the HTML for the top of a redirect page
1683          *
1684          * Chances are you should just be using the ParserOutput from
1685          * WikitextContent::getParserOutput instead of calling this for redirects.
1686          *
1687          * @since 1.23
1688          * @param Language $lang
1689          * @param Title|array $target Destination(s) to redirect
1690          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1691          * @return string Containing HTML with redirect link
1692          */
1693         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1694                 if ( !is_array( $target ) ) {
1695                         $target = [ $target ];
1696                 }
1697
1698                 $html = '<ul class="redirectText">';
1699                 /** @var Title $title */
1700                 foreach ( $target as $title ) {
1701                         $html .= '<li>' . Linker::link(
1702                                 $title,
1703                                 htmlspecialchars( $title->getFullText() ),
1704                                 [],
1705                                 // Make sure wiki page redirects are not followed
1706                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1707                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1708                         ) . '</li>';
1709                 }
1710                 $html .= '</ul>';
1711
1712                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1713
1714                 return '<div class="redirectMsg">' .
1715                         '<p>' . $redirectToText . '</p>' .
1716                         $html .
1717                         '</div>';
1718         }
1719
1720         /**
1721          * Adds help link with an icon via page indicators.
1722          * Link target can be overridden by a local message containing a wikilink:
1723          * the message key is: 'namespace-' + namespace number + '-helppage'.
1724          * @param string $to Target MediaWiki.org page title or encoded URL.
1725          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1726          * @since 1.25
1727          */
1728         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1729                 $msg = wfMessage(
1730                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1731                 );
1732
1733                 $out = $this->getContext()->getOutput();
1734                 if ( !$msg->isDisabled() ) {
1735                         $helpUrl = Skin::makeUrl( $msg->plain() );
1736                         $out->addHelpLink( $helpUrl, true );
1737                 } else {
1738                         $out->addHelpLink( $to, $overrideBaseUrl );
1739                 }
1740         }
1741
1742         /**
1743          * Handle action=render
1744          */
1745         public function render() {
1746                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1747                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1748                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1749                 $this->viewIsRenderAction = true;
1750                 $this->view();
1751         }
1752
1753         /**
1754          * action=protect handler
1755          */
1756         public function protect() {
1757                 $form = new ProtectionForm( $this );
1758                 $form->execute();
1759         }
1760
1761         /**
1762          * action=unprotect handler (alias)
1763          */
1764         public function unprotect() {
1765                 $this->protect();
1766         }
1767
1768         /**
1769          * UI entry point for page deletion
1770          */
1771         public function delete() {
1772                 # This code desperately needs to be totally rewritten
1773
1774                 $title = $this->getTitle();
1775                 $context = $this->getContext();
1776                 $user = $context->getUser();
1777                 $request = $context->getRequest();
1778
1779                 # Check permissions
1780                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1781                 if ( count( $permissionErrors ) ) {
1782                         throw new PermissionsError( 'delete', $permissionErrors );
1783                 }
1784
1785                 # Read-only check...
1786                 if ( wfReadOnly() ) {
1787                         throw new ReadOnlyError;
1788                 }
1789
1790                 # Better double-check that it hasn't been deleted yet!
1791                 $this->mPage->loadPageData(
1792                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1793                 );
1794                 if ( !$this->mPage->exists() ) {
1795                         $deleteLogPage = new LogPage( 'delete' );
1796                         $outputPage = $context->getOutput();
1797                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1798                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1799                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1800                                 );
1801                         $outputPage->addHTML(
1802                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1803                         );
1804                         LogEventsList::showLogExtract(
1805                                 $outputPage,
1806                                 'delete',
1807                                 $title
1808                         );
1809
1810                         return;
1811                 }
1812
1813                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1814                 $deleteReason = $request->getText( 'wpReason' );
1815
1816                 if ( $deleteReasonList == 'other' ) {
1817                         $reason = $deleteReason;
1818                 } elseif ( $deleteReason != '' ) {
1819                         // Entry from drop down menu + additional comment
1820                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1821                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1822                 } else {
1823                         $reason = $deleteReasonList;
1824                 }
1825
1826                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1827                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1828                 ) {
1829                         # Flag to hide all contents of the archived revisions
1830                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1831
1832                         $this->doDelete( $reason, $suppress );
1833
1834                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1835
1836                         return;
1837                 }
1838
1839                 // Generate deletion reason
1840                 $hasHistory = false;
1841                 if ( !$reason ) {
1842                         try {
1843                                 $reason = $this->generateReason( $hasHistory );
1844                         } catch ( Exception $e ) {
1845                                 # if a page is horribly broken, we still want to be able to
1846                                 # delete it. So be lenient about errors here.
1847                                 wfDebug( "Error while building auto delete summary: $e" );
1848                                 $reason = '';
1849                         }
1850                 }
1851
1852                 // If the page has a history, insert a warning
1853                 if ( $hasHistory ) {
1854                         $title = $this->getTitle();
1855
1856                         // The following can use the real revision count as this is only being shown for users
1857                         // that can delete this page.
1858                         // This, as a side-effect, also makes sure that the following query isn't being run for
1859                         // pages with a larger history, unless the user has the 'bigdelete' right
1860                         // (and is about to delete this page).
1861                         $dbr = wfGetDB( DB_REPLICA );
1862                         $revisions = $edits = (int)$dbr->selectField(
1863                                 'revision',
1864                                 'COUNT(rev_page)',
1865                                 [ 'rev_page' => $title->getArticleID() ],
1866                                 __METHOD__
1867                         );
1868
1869                         // @todo i18n issue/patchwork message
1870                         $context->getOutput()->addHTML(
1871                                 '<strong class="mw-delete-warning-revisions">' .
1872                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1873                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1874                                         $context->msg( 'history' )->escaped(),
1875                                         [],
1876                                         [ 'action' => 'history' ] ) .
1877                                 '</strong>'
1878                         );
1879
1880                         if ( $title->isBigDeletion() ) {
1881                                 global $wgDeleteRevisionsLimit;
1882                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1883                                         [
1884                                                 'delete-warning-toobig',
1885                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1886                                         ]
1887                                 );
1888                         }
1889                 }
1890
1891                 $this->confirmDelete( $reason );
1892         }
1893
1894         /**
1895          * Output deletion confirmation dialog
1896          * @todo Move to another file?
1897          * @param string $reason Prefilled reason
1898          */
1899         public function confirmDelete( $reason ) {
1900                 wfDebug( "Article::confirmDelete\n" );
1901
1902                 $title = $this->getTitle();
1903                 $ctx = $this->getContext();
1904                 $outputPage = $ctx->getOutput();
1905                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1906                 $outputPage->addBacklinkSubtitle( $title );
1907                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1908                 $outputPage->addModules( 'mediawiki.action.delete' );
1909
1910                 $backlinkCache = $title->getBacklinkCache();
1911                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1912                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1913                                 'deleting-backlinks-warning' );
1914                 }
1915
1916                 $subpageQueryLimit = 51;
1917                 $subpages = $title->getSubpages( $subpageQueryLimit );
1918                 $subpageCount = count( $subpages );
1919                 if ( $subpageCount > 0 ) {
1920                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1921                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1922                 }
1923                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1924
1925                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1926
1927                 $user = $this->getContext()->getUser();
1928                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1929
1930                 $outputPage->enableOOUI();
1931
1932                 $fields = [];
1933
1934                 $options = Xml::listDropDownOptions(
1935                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1936                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1937                 );
1938                 $options = Xml::listDropDownOptionsOoui( $options );
1939
1940                 $fields[] = new OOUI\FieldLayout(
1941                         new OOUI\DropdownInputWidget( [
1942                                 'name' => 'wpDeleteReasonList',
1943                                 'inputId' => 'wpDeleteReasonList',
1944                                 'tabIndex' => 1,
1945                                 'infusable' => true,
1946                                 'value' => '',
1947                                 'options' => $options
1948                         ] ),
1949                         [
1950                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1951                                 'align' => 'top',
1952                         ]
1953                 );
1954
1955                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1956                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1957                 // Unicode codepoints.
1958                 $fields[] = new OOUI\FieldLayout(
1959                         new OOUI\TextInputWidget( [
1960                                 'name' => 'wpReason',
1961                                 'inputId' => 'wpReason',
1962                                 'tabIndex' => 2,
1963                                 'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
1964                                 'infusable' => true,
1965                                 'value' => $reason,
1966                                 'autofocus' => true,
1967                         ] ),
1968                         [
1969                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1970                                 'align' => 'top',
1971                         ]
1972                 );
1973
1974                 if ( $user->isLoggedIn() ) {
1975                         $fields[] = new OOUI\FieldLayout(
1976                                 new OOUI\CheckboxInputWidget( [
1977                                         'name' => 'wpWatch',
1978                                         'inputId' => 'wpWatch',
1979                                         'tabIndex' => 3,
1980                                         'selected' => $checkWatch,
1981                                 ] ),
1982                                 [
1983                                         'label' => $ctx->msg( 'watchthis' )->text(),
1984                                         'align' => 'inline',
1985                                         'infusable' => true,
1986                                 ]
1987                         );
1988                 }
1989
1990                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1991                         $fields[] = new OOUI\FieldLayout(
1992                                 new OOUI\CheckboxInputWidget( [
1993                                         'name' => 'wpSuppress',
1994                                         'inputId' => 'wpSuppress',
1995                                         'tabIndex' => 4,
1996                                 ] ),
1997                                 [
1998                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1999                                         'align' => 'inline',
2000                                         'infusable' => true,
2001                                 ]
2002                         );
2003                 }
2004
2005                 $fields[] = new OOUI\FieldLayout(
2006                         new OOUI\ButtonInputWidget( [
2007                                 'name' => 'wpConfirmB',
2008                                 'inputId' => 'wpConfirmB',
2009                                 'tabIndex' => 5,
2010                                 'value' => $ctx->msg( 'deletepage' )->text(),
2011                                 'label' => $ctx->msg( 'deletepage' )->text(),
2012                                 'flags' => [ 'primary', 'destructive' ],
2013                                 'type' => 'submit',
2014                         ] ),
2015                         [
2016                                 'align' => 'top',
2017                         ]
2018                 );
2019
2020                 $fieldset = new OOUI\FieldsetLayout( [
2021                         'label' => $ctx->msg( 'delete-legend' )->text(),
2022                         'id' => 'mw-delete-table',
2023                         'items' => $fields,
2024                 ] );
2025
2026                 $form = new OOUI\FormLayout( [
2027                         'method' => 'post',
2028                         'action' => $title->getLocalURL( 'action=delete' ),
2029                         'id' => 'deleteconfirm',
2030                 ] );
2031                 $form->appendContent(
2032                         $fieldset,
2033                         new OOUI\HtmlSnippet(
2034                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2035                         )
2036                 );
2037
2038                 $outputPage->addHTML(
2039                         new OOUI\PanelLayout( [
2040                                 'classes' => [ 'deletepage-wrapper' ],
2041                                 'expanded' => false,
2042                                 'padded' => true,
2043                                 'framed' => true,
2044                                 'content' => $form,
2045                         ] )
2046                 );
2047
2048                 if ( $user->isAllowed( 'editinterface' ) ) {
2049                         $link = Linker::linkKnown(
2050                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2051                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2052                                 [],
2053                                 [ 'action' => 'edit' ]
2054                         );
2055                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2056                 }
2057
2058                 $deleteLogPage = new LogPage( 'delete' );
2059                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2060                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2061         }
2062
2063         /**
2064          * Perform a deletion and output success or failure messages
2065          * @param string $reason
2066          * @param bool $suppress
2067          * @param bool $immediate false allows deleting over time via the job queue
2068          * @throws FatalError
2069          * @throws MWException
2070          */
2071         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2072                 $error = '';
2073                 $context = $this->getContext();
2074                 $outputPage = $context->getOutput();
2075                 $user = $context->getUser();
2076                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2077                         [], 'delete', $immediate );
2078
2079                 if ( $status->isOK() ) {
2080                         $deleted = $this->getTitle()->getPrefixedText();
2081
2082                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2083                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2084
2085                         if ( $status->isGood() ) {
2086                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2087                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2088                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2089                         } else {
2090                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2091                         }
2092
2093                         $outputPage->returnToMain( false );
2094                 } else {
2095                         $outputPage->setPageTitle(
2096                                 wfMessage( 'cannotdelete-title',
2097                                         $this->getTitle()->getPrefixedText() )
2098                         );
2099
2100                         if ( $error == '' ) {
2101                                 $outputPage->wrapWikiTextAsInterface(
2102                                         'error mw-error-cannotdelete',
2103                                         $status->getWikiText()
2104                                 );
2105                                 $deleteLogPage = new LogPage( 'delete' );
2106                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2107
2108                                 LogEventsList::showLogExtract(
2109                                         $outputPage,
2110                                         'delete',
2111                                         $this->getTitle()
2112                                 );
2113                         } else {
2114                                 $outputPage->addHTML( $error );
2115                         }
2116                 }
2117         }
2118
2119         /* Caching functions */
2120
2121         /**
2122          * checkLastModified returns true if it has taken care of all
2123          * output to the client that is necessary for this request.
2124          * (that is, it has sent a cached version of the page)
2125          *
2126          * @return bool True if cached version send, false otherwise
2127          */
2128         protected function tryFileCache() {
2129                 static $called = false;
2130
2131                 if ( $called ) {
2132                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2133                         return false;
2134                 }
2135
2136                 $called = true;
2137                 if ( $this->isFileCacheable() ) {
2138                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2139                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2140                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2141                                 $cache->loadFromFileCache( $this->getContext() );
2142                                 return true;
2143                         } else {
2144                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2145                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2146                         }
2147                 } else {
2148                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2149                 }
2150
2151                 return false;
2152         }
2153
2154         /**
2155          * Check if the page can be cached
2156          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2157          * @return bool
2158          */
2159         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2160                 $cacheable = false;
2161
2162                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2163                         $cacheable = $this->mPage->getId()
2164                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2165                         // Extension may have reason to disable file caching on some pages.
2166                         if ( $cacheable ) {
2167                                 // Avoid PHP 7.1 warning of passing $this by reference
2168                                 $articlePage = $this;
2169                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2170                         }
2171                 }
2172
2173                 return $cacheable;
2174         }
2175
2176         /** #@- */
2177
2178         /**
2179          * Lightweight method to get the parser output for a page, checking the parser cache
2180          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2181          * consider, so it's not appropriate to use there.
2182          *
2183          * @since 1.16 (r52326) for LiquidThreads
2184          *
2185          * @param int|null $oldid Revision ID or null
2186          * @param User|null $user The relevant user
2187          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2188          */
2189         public function getParserOutput( $oldid = null, User $user = null ) {
2190                 // XXX: bypasses mParserOptions and thus setParserOptions()
2191
2192                 if ( $user === null ) {
2193                         $parserOptions = $this->getParserOptions();
2194                 } else {
2195                         $parserOptions = $this->mPage->makeParserOptions( $user );
2196                 }
2197
2198                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2199         }
2200
2201         /**
2202          * Override the ParserOptions used to render the primary article wikitext.
2203          *
2204          * @param ParserOptions $options
2205          * @throws MWException If the parser options where already initialized.
2206          */
2207         public function setParserOptions( ParserOptions $options ) {
2208                 if ( $this->mParserOptions ) {
2209                         throw new MWException( "can't change parser options after they have already been set" );
2210                 }
2211
2212                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2213                 $this->mParserOptions = clone $options;
2214         }
2215
2216         /**
2217          * Get parser options suitable for rendering the primary article wikitext
2218          * @return ParserOptions
2219          */
2220         public function getParserOptions() {
2221                 if ( !$this->mParserOptions ) {
2222                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2223                 }
2224                 // Clone to allow modifications of the return value without affecting cache
2225                 return clone $this->mParserOptions;
2226         }
2227
2228         /**
2229          * Sets the context this Article is executed in
2230          *
2231          * @param IContextSource $context
2232          * @since 1.18
2233          */
2234         public function setContext( $context ) {
2235                 $this->mContext = $context;
2236         }
2237
2238         /**
2239          * Gets the context this Article is executed in
2240          *
2241          * @return IContextSource
2242          * @since 1.18
2243          */
2244         public function getContext() {
2245                 if ( $this->mContext instanceof IContextSource ) {
2246                         return $this->mContext;
2247                 } else {
2248                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2249                                 "Return RequestContext::getMain(); for sanity\n" );
2250                         return RequestContext::getMain();
2251                 }
2252         }
2253
2254         /**
2255          * Use PHP's magic __get handler to handle accessing of
2256          * raw WikiPage fields for backwards compatibility.
2257          *
2258          * @param string $fname Field name
2259          * @return mixed
2260          */
2261         public function __get( $fname ) {
2262                 if ( property_exists( $this->mPage, $fname ) ) {
2263                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2264                         return $this->mPage->$fname;
2265                 }
2266                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2267         }
2268
2269         /**
2270          * Use PHP's magic __set handler to handle setting of
2271          * raw WikiPage fields for backwards compatibility.
2272          *
2273          * @param string $fname Field name
2274          * @param mixed $fvalue New value
2275          */
2276         public function __set( $fname, $fvalue ) {
2277                 if ( property_exists( $this->mPage, $fname ) ) {
2278                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2279                         $this->mPage->$fname = $fvalue;
2280                 // Note: extensions may want to toss on new fields
2281                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2282                         $this->mPage->$fname = $fvalue;
2283                 } else {
2284                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2285                 }
2286         }
2287
2288         /**
2289          * Call to WikiPage function for backwards compatibility.
2290          * @see WikiPage::checkFlags
2291          */
2292         public function checkFlags( $flags ) {
2293                 return $this->mPage->checkFlags( $flags );
2294         }
2295
2296         /**
2297          * Call to WikiPage function for backwards compatibility.
2298          * @see WikiPage::checkTouched
2299          */
2300         public function checkTouched() {
2301                 return $this->mPage->checkTouched();
2302         }
2303
2304         /**
2305          * Call to WikiPage function for backwards compatibility.
2306          * @see WikiPage::clearPreparedEdit
2307          */
2308         public function clearPreparedEdit() {
2309                 $this->mPage->clearPreparedEdit();
2310         }
2311
2312         /**
2313          * Call to WikiPage function for backwards compatibility.
2314          * @see WikiPage::doDeleteArticleReal
2315          */
2316         public function doDeleteArticleReal(
2317                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2318                 $tags = [], $immediate = false
2319         ) {
2320                 return $this->mPage->doDeleteArticleReal(
2321                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2322                 );
2323         }
2324
2325         /**
2326          * Call to WikiPage function for backwards compatibility.
2327          * @see WikiPage::doDeleteUpdates
2328          */
2329         public function doDeleteUpdates(
2330                 $id,
2331                 Content $content = null,
2332                 $revision = null,
2333                 User $user = null
2334         ) {
2335                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2336         }
2337
2338         /**
2339          * Call to WikiPage function for backwards compatibility.
2340          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2341          * @see WikiPage::doEditContent
2342          */
2343         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2344                 User $user = null, $serialFormat = null
2345         ) {
2346                 wfDeprecated( __METHOD__, '1.29' );
2347                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2348                         $user, $serialFormat
2349                 );
2350         }
2351
2352         /**
2353          * Call to WikiPage function for backwards compatibility.
2354          * @see WikiPage::doEditUpdates
2355          */
2356         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2357                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2358         }
2359
2360         /**
2361          * Call to WikiPage function for backwards compatibility.
2362          * @see WikiPage::doPurge
2363          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2364          *  controlled how much purging was done.
2365          */
2366         public function doPurge() {
2367                 return $this->mPage->doPurge();
2368         }
2369
2370         /**
2371          * Call to WikiPage function for backwards compatibility.
2372          * @see WikiPage::doViewUpdates
2373          */
2374         public function doViewUpdates( User $user, $oldid = 0 ) {
2375                 $this->mPage->doViewUpdates( $user, $oldid );
2376         }
2377
2378         /**
2379          * Call to WikiPage function for backwards compatibility.
2380          * @see WikiPage::exists
2381          */
2382         public function exists() {
2383                 return $this->mPage->exists();
2384         }
2385
2386         /**
2387          * Call to WikiPage function for backwards compatibility.
2388          * @see WikiPage::followRedirect
2389          */
2390         public function followRedirect() {
2391                 return $this->mPage->followRedirect();
2392         }
2393
2394         /**
2395          * Call to WikiPage function for backwards compatibility.
2396          * @see ContentHandler::getActionOverrides
2397          */
2398         public function getActionOverrides() {
2399                 return $this->mPage->getActionOverrides();
2400         }
2401
2402         /**
2403          * Call to WikiPage function for backwards compatibility.
2404          * @see WikiPage::getAutoDeleteReason
2405          */
2406         public function getAutoDeleteReason( &$hasHistory ) {
2407                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2408         }
2409
2410         /**
2411          * Call to WikiPage function for backwards compatibility.
2412          * @see WikiPage::getCategories
2413          */
2414         public function getCategories() {
2415                 return $this->mPage->getCategories();
2416         }
2417
2418         /**
2419          * Call to WikiPage function for backwards compatibility.
2420          * @see WikiPage::getComment
2421          */
2422         public function getComment( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2423                 return $this->mPage->getComment( $audience, $user );
2424         }
2425
2426         /**
2427          * Call to WikiPage function for backwards compatibility.
2428          * @see WikiPage::getContentHandler
2429          */
2430         public function getContentHandler() {
2431                 return $this->mPage->getContentHandler();
2432         }
2433
2434         /**
2435          * Call to WikiPage function for backwards compatibility.
2436          * @see WikiPage::getContentModel
2437          */
2438         public function getContentModel() {
2439                 return $this->mPage->getContentModel();
2440         }
2441
2442         /**
2443          * Call to WikiPage function for backwards compatibility.
2444          * @see WikiPage::getContributors
2445          */
2446         public function getContributors() {
2447                 return $this->mPage->getContributors();
2448         }
2449
2450         /**
2451          * Call to WikiPage function for backwards compatibility.
2452          * @see WikiPage::getCreator
2453          */
2454         public function getCreator( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2455                 return $this->mPage->getCreator( $audience, $user );
2456         }
2457
2458         /**
2459          * Call to WikiPage function for backwards compatibility.
2460          * @see WikiPage::getDeletionUpdates
2461          */
2462         public function getDeletionUpdates( Content $content = null ) {
2463                 return $this->mPage->getDeletionUpdates( $content );
2464         }
2465
2466         /**
2467          * Call to WikiPage function for backwards compatibility.
2468          * @see WikiPage::getHiddenCategories
2469          */
2470         public function getHiddenCategories() {
2471                 return $this->mPage->getHiddenCategories();
2472         }
2473
2474         /**
2475          * Call to WikiPage function for backwards compatibility.
2476          * @see WikiPage::getId
2477          */
2478         public function getId() {
2479                 return $this->mPage->getId();
2480         }
2481
2482         /**
2483          * Call to WikiPage function for backwards compatibility.
2484          * @see WikiPage::getLatest
2485          */
2486         public function getLatest() {
2487                 return $this->mPage->getLatest();
2488         }
2489
2490         /**
2491          * Call to WikiPage function for backwards compatibility.
2492          * @see WikiPage::getLinksTimestamp
2493          */
2494         public function getLinksTimestamp() {
2495                 return $this->mPage->getLinksTimestamp();
2496         }
2497
2498         /**
2499          * Call to WikiPage function for backwards compatibility.
2500          * @see WikiPage::getMinorEdit
2501          */
2502         public function getMinorEdit() {
2503                 return $this->mPage->getMinorEdit();
2504         }
2505
2506         /**
2507          * Call to WikiPage function for backwards compatibility.
2508          * @see WikiPage::getOldestRevision
2509          */
2510         public function getOldestRevision() {
2511                 return $this->mPage->getOldestRevision();
2512         }
2513
2514         /**
2515          * Call to WikiPage function for backwards compatibility.
2516          * @see WikiPage::getRedirectTarget
2517          */
2518         public function getRedirectTarget() {
2519                 return $this->mPage->getRedirectTarget();
2520         }
2521
2522         /**
2523          * Call to WikiPage function for backwards compatibility.
2524          * @see WikiPage::getRedirectURL
2525          */
2526         public function getRedirectURL( $rt ) {
2527                 return $this->mPage->getRedirectURL( $rt );
2528         }
2529
2530         /**
2531          * Call to WikiPage function for backwards compatibility.
2532          * @see WikiPage::getRevision
2533          */
2534         public function getRevision() {
2535                 return $this->mPage->getRevision();
2536         }
2537
2538         /**
2539          * Call to WikiPage function for backwards compatibility.
2540          * @see WikiPage::getTimestamp
2541          */
2542         public function getTimestamp() {
2543                 return $this->mPage->getTimestamp();
2544         }
2545
2546         /**
2547          * Call to WikiPage function for backwards compatibility.
2548          * @see WikiPage::getTouched
2549          */
2550         public function getTouched() {
2551                 return $this->mPage->getTouched();
2552         }
2553
2554         /**
2555          * Call to WikiPage function for backwards compatibility.
2556          * @see WikiPage::getUndoContent
2557          */
2558         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2559                 return $this->mPage->getUndoContent( $undo, $undoafter );
2560         }
2561
2562         /**
2563          * Call to WikiPage function for backwards compatibility.
2564          * @see WikiPage::getUser
2565          */
2566         public function getUser( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2567                 return $this->mPage->getUser( $audience, $user );
2568         }
2569
2570         /**
2571          * Call to WikiPage function for backwards compatibility.
2572          * @see WikiPage::getUserText
2573          */
2574         public function getUserText( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2575                 return $this->mPage->getUserText( $audience, $user );
2576         }
2577
2578         /**
2579          * Call to WikiPage function for backwards compatibility.
2580          * @see WikiPage::hasViewableContent
2581          */
2582         public function hasViewableContent() {
2583                 return $this->mPage->hasViewableContent();
2584         }
2585
2586         /**
2587          * Call to WikiPage function for backwards compatibility.
2588          * @see WikiPage::insertOn
2589          */
2590         public function insertOn( $dbw, $pageId = null ) {
2591                 return $this->mPage->insertOn( $dbw, $pageId );
2592         }
2593
2594         /**
2595          * Call to WikiPage function for backwards compatibility.
2596          * @see WikiPage::insertProtectNullRevision
2597          */
2598         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2599                 array $expiry, $cascade, $reason, $user = null
2600         ) {
2601                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2602                         $expiry, $cascade, $reason, $user
2603                 );
2604         }
2605
2606         /**
2607          * Call to WikiPage function for backwards compatibility.
2608          * @see WikiPage::insertRedirect
2609          */
2610         public function insertRedirect() {
2611                 return $this->mPage->insertRedirect();
2612         }
2613
2614         /**
2615          * Call to WikiPage function for backwards compatibility.
2616          * @see WikiPage::insertRedirectEntry
2617          */
2618         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2619                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2620         }
2621
2622         /**
2623          * Call to WikiPage function for backwards compatibility.
2624          * @see WikiPage::isCountable
2625          */
2626         public function isCountable( $editInfo = false ) {
2627                 return $this->mPage->isCountable( $editInfo );
2628         }
2629
2630         /**
2631          * Call to WikiPage function for backwards compatibility.
2632          * @see WikiPage::isRedirect
2633          */
2634         public function isRedirect() {
2635                 return $this->mPage->isRedirect();
2636         }
2637
2638         /**
2639          * Call to WikiPage function for backwards compatibility.
2640          * @see WikiPage::loadFromRow
2641          */
2642         public function loadFromRow( $data, $from ) {
2643                 return $this->mPage->loadFromRow( $data, $from );
2644         }
2645
2646         /**
2647          * Call to WikiPage function for backwards compatibility.
2648          * @see WikiPage::loadPageData
2649          */
2650         public function loadPageData( $from = 'fromdb' ) {
2651                 $this->mPage->loadPageData( $from );
2652         }
2653
2654         /**
2655          * Call to WikiPage function for backwards compatibility.
2656          * @see WikiPage::lockAndGetLatest
2657          */
2658         public function lockAndGetLatest() {
2659                 return $this->mPage->lockAndGetLatest();
2660         }
2661
2662         /**
2663          * Call to WikiPage function for backwards compatibility.
2664          * @see WikiPage::makeParserOptions
2665          */
2666         public function makeParserOptions( $context ) {
2667                 return $this->mPage->makeParserOptions( $context );
2668         }
2669
2670         /**
2671          * Call to WikiPage function for backwards compatibility.
2672          * @see WikiPage::pageDataFromId
2673          */
2674         public function pageDataFromId( $dbr, $id, $options = [] ) {
2675                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2676         }
2677
2678         /**
2679          * Call to WikiPage function for backwards compatibility.
2680          * @see WikiPage::pageDataFromTitle
2681          */
2682         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2683                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2684         }
2685
2686         /**
2687          * Call to WikiPage function for backwards compatibility.
2688          * @see WikiPage::prepareContentForEdit
2689          */
2690         public function prepareContentForEdit(
2691                 Content $content, $revision = null, User $user = null,
2692                 $serialFormat = null, $useCache = true
2693         ) {
2694                 return $this->mPage->prepareContentForEdit(
2695                         $content, $revision, $user,
2696                         $serialFormat, $useCache
2697                 );
2698         }
2699
2700         /**
2701          * Call to WikiPage function for backwards compatibility.
2702          * @see WikiPage::protectDescription
2703          */
2704         public function protectDescription( array $limit, array $expiry ) {
2705                 return $this->mPage->protectDescription( $limit, $expiry );
2706         }
2707
2708         /**
2709          * Call to WikiPage function for backwards compatibility.
2710          * @see WikiPage::protectDescriptionLog
2711          */
2712         public function protectDescriptionLog( array $limit, array $expiry ) {
2713                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2714         }
2715
2716         /**
2717          * Call to WikiPage function for backwards compatibility.
2718          * @see WikiPage::replaceSectionAtRev
2719          */
2720         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2721                 $sectionTitle = '', $baseRevId = null
2722         ) {
2723                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2724                         $sectionTitle, $baseRevId
2725                 );
2726         }
2727
2728         /**
2729          * Call to WikiPage function for backwards compatibility.
2730          * @see WikiPage::replaceSectionContent
2731          */
2732         public function replaceSectionContent(
2733                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2734         ) {
2735                 return $this->mPage->replaceSectionContent(
2736                         $sectionId, $sectionContent, $sectionTitle, $edittime
2737                 );
2738         }
2739
2740         /**
2741          * Call to WikiPage function for backwards compatibility.
2742          * @see WikiPage::setTimestamp
2743          */
2744         public function setTimestamp( $ts ) {
2745                 $this->mPage->setTimestamp( $ts );
2746         }
2747
2748         /**
2749          * Call to WikiPage function for backwards compatibility.
2750          * @see WikiPage::shouldCheckParserCache
2751          */
2752         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2753                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2754         }
2755
2756         /**
2757          * Call to WikiPage function for backwards compatibility.
2758          * @see WikiPage::supportsSections
2759          */
2760         public function supportsSections() {
2761                 return $this->mPage->supportsSections();
2762         }
2763
2764         /**
2765          * Call to WikiPage function for backwards compatibility.
2766          * @see WikiPage::triggerOpportunisticLinksUpdate
2767          */
2768         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2769                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2770         }
2771
2772         /**
2773          * Call to WikiPage function for backwards compatibility.
2774          * @see WikiPage::updateCategoryCounts
2775          */
2776         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2777                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2778         }
2779
2780         /**
2781          * Call to WikiPage function for backwards compatibility.
2782          * @see WikiPage::updateIfNewerOn
2783          */
2784         public function updateIfNewerOn( $dbw, $revision ) {
2785                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2786         }
2787
2788         /**
2789          * Call to WikiPage function for backwards compatibility.
2790          * @see WikiPage::updateRedirectOn
2791          */
2792         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2793                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2794         }
2795
2796         /**
2797          * Call to WikiPage function for backwards compatibility.
2798          * @see WikiPage::updateRevisionOn
2799          */
2800         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2801                 $lastRevIsRedirect = null
2802         ) {
2803                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2804                         $lastRevIsRedirect
2805                 );
2806         }
2807
2808         /**
2809          * @param array $limit
2810          * @param array $expiry
2811          * @param bool &$cascade
2812          * @param string $reason
2813          * @param User $user
2814          * @return Status
2815          */
2816         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2817                 $reason, User $user
2818         ) {
2819                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2820         }
2821
2822         /**
2823          * @param array $limit
2824          * @param string $reason
2825          * @param int &$cascade
2826          * @param array $expiry
2827          * @return bool
2828          */
2829         public function updateRestrictions( $limit = [], $reason = '',
2830                 &$cascade = 0, $expiry = []
2831         ) {
2832                 return $this->mPage->doUpdateRestrictions(
2833                         $limit,
2834                         $expiry,
2835                         $cascade,
2836                         $reason,
2837                         $this->getContext()->getUser()
2838                 );
2839         }
2840
2841         /**
2842          * @param string $reason
2843          * @param bool $suppress
2844          * @param int|null $u1 Unused
2845          * @param bool|null $u2 Unused
2846          * @param string &$error
2847          * @param bool $immediate false allows deleting over time via the job queue
2848          * @return bool
2849          * @throws FatalError
2850          * @throws MWException
2851          */
2852         public function doDeleteArticle(
2853                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2854         ) {
2855                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2856                         null, $immediate );
2857         }
2858
2859         /**
2860          * @param string $fromP
2861          * @param string $summary
2862          * @param string $token
2863          * @param bool $bot
2864          * @param array &$resultDetails
2865          * @param User|null $user
2866          * @return array
2867          */
2868         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2869                 if ( !$user ) {
2870                         $user = $this->getContext()->getUser();
2871                 }
2872
2873                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2874         }
2875
2876         /**
2877          * @param string $fromP
2878          * @param string $summary
2879          * @param bool $bot
2880          * @param array &$resultDetails
2881          * @param User|null $guser
2882          * @return array
2883          */
2884         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2885                 if ( !$guser ) {
2886                         $guser = $this->getContext()->getUser();
2887                 }
2888
2889                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2890         }
2891
2892         /**
2893          * @param bool &$hasHistory
2894          * @return mixed
2895          */
2896         public function generateReason( &$hasHistory ) {
2897                 $title = $this->mPage->getTitle();
2898                 $handler = ContentHandler::getForTitle( $title );
2899                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2900         }
2901
2902         // ******
2903 }