includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Revision\MutableRevisionRecord;
  24 use MediaWiki\Revision\RevisionRecord;
  25 use MediaWiki\Revision\SlotRecord;
  26
  27 /**
  28  * Class for viewing MediaWiki article and history.
  29  *
  30  * This maintains WikiPage functions for backwards compatibility.
  31  *
  32  * @todo Move and rewrite code to an Action class
  33  *
  34  * Note: edit user interface and cache support functions have been
  35  * moved to separate EditPage and HTMLFileCache classes.
  36  */
  37 class Article implements Page {
  38         /**
  39          * @var IContextSource|null The context this Article is executed in.
  40          * If null, RequestContext::getMain() is used.
  41          */
  42         protected $mContext;
  43
  44         /** @var WikiPage|null The WikiPage object of this instance */
  45         protected $mPage;
  46
  47         /**
  48          * @var ParserOptions|null ParserOptions object for $wgUser articles.
  49          * Initialized by getParserOptions by calling $this->mPage->makeParserOptions().
  50          */
  51         public $mParserOptions;
  52
  53         /**
  54          * @var Content|null Content of the main slot of $this->mRevision.
  55          * @note This variable is read only, setting it has no effect.
  56          *       Extensions that wish to override the output of Article::view should use a hook.
  57          * @todo MCR: Remove in 1.33
  58          * @deprecated since 1.32
  59          * @since 1.21
  60          */
  61         public $mContentObject;
  62
  63         /**
  64          * @var bool Is the target revision loaded? Set by fetchRevisionRecord().
  65          *
  66          * @deprecated since 1.32. Whether content has been loaded should not be relevant to
  67          * code outside this class.
  68          */
  69         public $mContentLoaded = false;
  70
  71         /**
  72          * @var int|null The oldid of the article that was requested to be shown,
  73          * 0 for the current revision.
  74          * @see $mRevIdFetched
  75          */
  76         public $mOldId;
  77
  78         /** @var Title|null Title from which we were redirected here, if any. */
  79         public $mRedirectedFrom = null;
  80
  81         /** @var string|bool URL to redirect to or false if none */
  82         public $mRedirectUrl = false;
  83
  84         /**
  85          * @var int Revision ID of revision that was loaded.
  86          * @see $mOldId
  87          * @deprecated since 1.32, use getRevIdFetched() instead.
  88          */
  89         public $mRevIdFetched = 0;
  90
  91         /**
  92          * @var Status|null represents the outcome of fetchRevisionRecord().
  93          * $fetchResult->value is the RevisionRecord object, if the operation was successful.
  94          *
  95          * The information in $fetchResult is duplicated by the following deprecated public fields:
  96          * $mRevIdFetched, $mContentLoaded. $mRevision (and $mContentObject) also typically duplicate
  97          * information of the loaded revision, but may be overwritten by extensions or due to errors.
  98          */
  99         private $fetchResult = null;
 100
 101         /**
 102          * @var Revision|null Revision to be shown. Initialized by getOldIDFromRequest()
 103          * or fetchContentObject(). Normally loaded from the database, but may be replaced
 104          * by an extension, or be a fake representing an error message or some such.
 105          * While the output of Article::view is typically based on this revision,
 106          * it may be overwritten by error messages or replaced by extensions.
 107          */
 108         public $mRevision = null;
 109
 110         /**
 111          * @var ParserOutput|null|false The ParserOutput generated for viewing the page,
 112          * initialized by view(). If no ParserOutput could be generated, this is set to false.
 113          * @deprecated since 1.32
 114          */
 115         public $mParserOutput = null;
 116
 117         /**
 118          * @var bool Whether render() was called. With the way subclasses work
 119          * here, there doesn't seem to be any other way to stop calling
 120          * OutputPage::enableSectionEditLinks() and still have it work as it did before.
 121          */
 122         protected $viewIsRenderAction = false;
 123
 124         /**
 125          * Constructor and clear the article
 126          * @param Title $title Reference to a Title object.
 127          * @param int|null $oldId Revision ID, null to fetch from request, zero for current
 128          */
 129         public function __construct( Title $title, $oldId = null ) {
 130                 $this->mOldId = $oldId;
 131                 $this->mPage = $this->newPage( $title );
 132         }
 133
 134         /**
 135          * @param Title $title
 136          * @return WikiPage
 137          */
 138         protected function newPage( Title $title ) {
 139                 return new WikiPage( $title );
 140         }
 141
 142         /**
 143          * Constructor from a page id
 144          * @param int $id Article ID to load
 145          * @return Article|null
 146          */
 147         public static function newFromID( $id ) {
 148                 $t = Title::newFromID( $id );
 149                 return $t == null ? null : new static( $t );
 150         }
 151
 152         /**
 153          * Create an Article object of the appropriate class for the given page.
 154          *
 155          * @param Title $title
 156          * @param IContextSource $context
 157          * @return Article
 158          */
 159         public static function newFromTitle( $title, IContextSource $context ) {
 160                 if ( NS_MEDIA == $title->getNamespace() ) {
 161                         // XXX: This should not be here, but where should it go?
 162                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 163                 }
 164
 165                 $page = null;
 166                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 167                 if ( !$page ) {
 168                         switch ( $title->getNamespace() ) {
 169                                 case NS_FILE:
 170                                         $page = new ImagePage( $title );
 171                                         break;
 172                                 case NS_CATEGORY:
 173                                         $page = new CategoryPage( $title );
 174                                         break;
 175                                 default:
 176                                         $page = new Article( $title );
 177                         }
 178                 }
 179                 $page->setContext( $context );
 180
 181                 return $page;
 182         }
 183
 184         /**
 185          * Create an Article object of the appropriate class for the given page.
 186          *
 187          * @param WikiPage $page
 188          * @param IContextSource $context
 189          * @return Article
 190          */
 191         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 192                 $article = self::newFromTitle( $page->getTitle(), $context );
 193                 $article->mPage = $page; // override to keep process cached vars
 194                 return $article;
 195         }
 196
 197         /**
 198          * Get the page this view was redirected from
 199          * @return Title|null
 200          * @since 1.28
 201          */
 202         public function getRedirectedFrom() {
 203                 return $this->mRedirectedFrom;
 204         }
 205
 206         /**
 207          * Tell the page view functions that this view was redirected
 208          * from another page on the wiki.
 209          * @param Title $from
 210          */
 211         public function setRedirectedFrom( Title $from ) {
 212                 $this->mRedirectedFrom = $from;
 213         }
 214
 215         /**
 216          * Get the title object of the article
 217          *
 218          * @return Title Title object of this page
 219          */
 220         public function getTitle() {
 221                 return $this->mPage->getTitle();
 222         }
 223
 224         /**
 225          * Get the WikiPage object of this instance
 226          *
 227          * @since 1.19
 228          * @return WikiPage
 229          */
 230         public function getPage() {
 231                 return $this->mPage;
 232         }
 233
 234         /**
 235          * Clear the object
 236          */
 237         public function clear() {
 238                 $this->mContentLoaded = false;
 239
 240                 $this->mRedirectedFrom = null; # Title object if set
 241                 $this->mRevIdFetched = 0;
 242                 $this->mRedirectUrl = false;
 243                 $this->mRevision = null;
 244                 $this->mContentObject = null;
 245                 $this->fetchResult = null;
 246
 247                 // TODO hard-deprecate direct access to public fields
 248
 249                 $this->mPage->clear();
 250         }
 251
 252         /**
 253          * Returns a Content object representing the pages effective display content,
 254          * not necessarily the revision's content!
 255          *
 256          * Note that getContent does not follow redirects anymore.
 257          * If you need to fetch redirectable content easily, try
 258          * the shortcut in WikiPage::getRedirectTarget()
 259          *
 260          * This function has side effects! Do not use this function if you
 261          * only want the real revision text if any.
 262          *
 263          * @deprecated since 1.32, use getRevisionFetched() or fetchRevisionRecord() instead.
 264          *
 265          * @return Content
 266          *
 267          * @since 1.21
 268          */
 269         protected function getContentObject() {
 270                 if ( $this->mPage->getId() === 0 ) {
 271                         $content = $this->getSubstituteContent();
 272                 } else {
 273                         $this->fetchContentObject();
 274                         $content = $this->mContentObject;
 275                 }
 276
 277                 return $content;
 278         }
 279
 280         /**
 281          * Returns Content object to use when the page does not exist.
 282          *
 283          * @return Content
 284          */
 285         private function getSubstituteContent() {
 286                 # If this is a MediaWiki:x message, then load the messages
 287                 # and return the message value for x.
 288                 if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 289                         $text = $this->getTitle()->getDefaultMessageText();
 290                         if ( $text === false ) {
 291                                 $text = '';
 292                         }
 293
 294                         $content = ContentHandler::makeContent( $text, $this->getTitle() );
 295                 } else {
 296                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 297                         $content = new MessageContent( $message, null );
 298                 }
 299
 300                 return $content;
 301         }
 302
 303         /**
 304          * Returns ParserOutput to use when a page does not exist. In some cases, we still want to show
 305          * "virtual" content, e.g. in the MediaWiki namespace, or in the File namespace for non-local
 306          * files.
 307          *
 308          * @param ParserOptions $options
 309          *
 310          * @return ParserOutput
 311          */
 312         protected function getEmptyPageParserOutput( ParserOptions $options ) {
 313                 $content = $this->getSubstituteContent();
 314
 315                 return $content->getParserOutput( $this->getTitle(), 0, $options );
 316         }
 317
 318         /**
 319          * @see getOldIDFromRequest()
 320          * @see getRevIdFetched()
 321          *
 322          * @return int The oldid of the article that is was requested in the constructor or via the
 323          *         context's WebRequest.
 324          */
 325         public function getOldID() {
 326                 if ( is_null( $this->mOldId ) ) {
 327                         $this->mOldId = $this->getOldIDFromRequest();
 328                 }
 329
 330                 return $this->mOldId;
 331         }
 332
 333         /**
 334          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 335          *
 336          * @return int The old id for the request
 337          */
 338         public function getOldIDFromRequest() {
 339                 $this->mRedirectUrl = false;
 340
 341                 $request = $this->getContext()->getRequest();
 342                 $oldid = $request->getIntOrNull( 'oldid' );
 343
 344                 if ( $oldid === null ) {
 345                         return 0;
 346                 }
 347
 348                 if ( $oldid !== 0 ) {
 349                         # Load the given revision and check whether the page is another one.
 350                         # In that case, update this instance to reflect the change.
 351                         if ( $oldid === $this->mPage->getLatest() ) {
 352                                 $this->mRevision = $this->mPage->getRevision();
 353                         } else {
 354                                 $this->mRevision = Revision::newFromId( $oldid );
 355                                 if ( $this->mRevision !== null ) {
 356                                         // Revision title doesn't match the page title given?
 357                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 358                                                 $function = get_class( $this->mPage ) . '::newFromID';
 359                                                 $this->mPage = $function( $this->mRevision->getPage() );
 360                                         }
 361                                 }
 362                         }
 363                 }
 364
 365                 if ( $request->getVal( 'direction' ) == 'next' ) {
 366                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 367                         if ( $nextid ) {
 368                                 $oldid = $nextid;
 369                                 $this->mRevision = null;
 370                         } else {
 371                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 372                         }
 373                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 374                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 375                         if ( $previd ) {
 376                                 $oldid = $previd;
 377                                 $this->mRevision = null;
 378                         }
 379                 }
 380
 381                 $this->mRevIdFetched = $this->mRevision ? $this->mRevision->getId() : 0;
 382
 383                 return $oldid;
 384         }
 385
 386         /**
 387          * Get text content object
 388          * Does *NOT* follow redirects.
 389          * @todo When is this null?
 390          * @deprecated since 1.32, use fetchRevisionRecord() instead.
 391          *
 392          * @note Code that wants to retrieve page content from the database should
 393          * use WikiPage::getContent().
 394          *
 395          * @return Content|null|bool
 396          *
 397          * @since 1.21
 398          */
 399         protected function fetchContentObject() {
 400                 if ( !$this->mContentLoaded ) {
 401                         $this->fetchRevisionRecord();
 402                 }
 403
 404                 return $this->mContentObject;
 405         }
 406
 407         /**
 408          * Fetches the revision to work on.
 409          * The revision is typically loaded from the database, but may also be a fake representing
 410          * an error message or content supplied by an extension. Refer to $this->fetchResult for
 411          * the revision actually loaded from the database, and any errors encountered while doing
 412          * that.
 413          *
 414          * @return RevisionRecord|null
 415          */
 416         protected function fetchRevisionRecord() {
 417                 if ( $this->fetchResult ) {
 418                         return $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 419                 }
 420
 421                 $this->mContentLoaded = true;
 422                 $this->mContentObject = null;
 423
 424                 $oldid = $this->getOldID();
 425
 426                 // $this->mRevision might already be fetched by getOldIDFromRequest()
 427                 if ( !$this->mRevision ) {
 428                         if ( !$oldid ) {
 429                                 $this->mRevision = $this->mPage->getRevision();
 430
 431                                 if ( !$this->mRevision ) {
 432                                         wfDebug( __METHOD__ . " failed to find page data for title " .
 433                                                 $this->getTitle()->getPrefixedText() . "\n" );
 434
 435                                         // Just for sanity, output for this case is done by showMissingArticle().
 436                                         $this->fetchResult = Status::newFatal( 'noarticletext' );
 437                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 438                                         return null;
 439                                 }
 440                         } else {
 441                                 $this->mRevision = Revision::newFromId( $oldid );
 442
 443                                 if ( !$this->mRevision ) {
 444                                         wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid\n" );
 445
 446                                         $this->fetchResult = Status::newFatal( 'missing-revision', $oldid );
 447                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 448                                         return null;
 449                                 }
 450                         }
 451                 }
 452
 453                 $this->mRevIdFetched = $this->mRevision->getId();
 454                 $this->fetchResult = Status::newGood( $this->mRevision );
 455
 456                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $this->getContext()->getUser() ) ) {
 457                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 458                                 $this->mRevision->getId() . "\n" );
 459
 460                         // Just for sanity, output for this case is done by showDeletedRevisionHeader().
 461                         $this->fetchResult = Status::newFatal( 'rev-deleted-text-permission' );
 462                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 463                         return null;
 464                 }
 465
 466                 if ( Hooks::isRegistered( 'ArticleAfterFetchContentObject' ) ) {
 467                         $contentObject = $this->mRevision->getContent(
 468                                 Revision::FOR_THIS_USER,
 469                                 $this->getContext()->getUser()
 470                         );
 471
 472                         $hookContentObject = $contentObject;
 473
 474                                 // Avoid PHP 7.1 warning of passing $this by reference
 475                         $articlePage = $this;
 476
 477                         Hooks::run(
 478                                 'ArticleAfterFetchContentObject',
 479                                 [ &$articlePage, &$hookContentObject ],
 480                                 '1.32'
 481                         );
 482
 483                         if ( $hookContentObject !== $contentObject ) {
 484                                 // A hook handler is trying to override the content
 485                                 $this->applyContentOverride( $hookContentObject );
 486                         }
 487                 }
 488
 489                 // For B/C only
 490                 $this->mContentObject = $this->mRevision->getContent(
 491                         Revision::FOR_THIS_USER,
 492                         $this->getContext()->getUser()
 493                 );
 494
 495                 return $this->mRevision->getRevisionRecord();
 496         }
 497
 498         /**
 499          * Returns a Content object representing any error in $this->fetchContent, or null
 500          * if there is no such error.
 501          *
 502          * @return Content|null
 503          */
 504         private function makeFetchErrorContent() {
 505                 if ( !$this->fetchResult || $this->fetchResult->isOK() ) {
 506                         return null;
 507                 }
 508
 509                 return new MessageContent( $this->fetchResult->getMessage() );
 510         }
 511
 512         /**
 513          * Applies a content override by constructing a fake Revision object and assigning
 514          * it to mRevision. The fake revision will not have a user, timestamp or summary set.
 515          *
 516          * This mechanism exists mainly to accommodate extensions that use the
 517          * ArticleAfterFetchContentObject. Once that hook has been removed, there should no longer
 518          * be a need for a fake revision object. fetchRevisionRecord() presently also uses this mechanism
 519          * to report errors, but that could be changed to use $this->fetchResult instead.
 520          *
 521          * @param Content $override Content to be used instead of the actual page content,
 522          *        coming from an extension or representing an error message.
 523          */
 524         private function applyContentOverride( Content $override ) {
 525                 // Construct a fake revision
 526                 $rev = new MutableRevisionRecord( $this->getTitle() );
 527                 $rev->setContent( SlotRecord::MAIN, $override );
 528
 529                 $this->mRevision = new Revision( $rev );
 530
 531                 // For B/C only
 532                 $this->mContentObject = $override;
 533         }
 534
 535         /**
 536          * Returns true if the currently-referenced revision is the current edit
 537          * to this page (and it exists).
 538          * @return bool
 539          */
 540         public function isCurrent() {
 541                 # If no oldid, this is the current version.
 542                 if ( $this->getOldID() == 0 ) {
 543                         return true;
 544                 }
 545
 546                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 547         }
 548
 549         /**
 550          * Get the fetched Revision object depending on request parameters or null
 551          * on failure. The revision returned may be a fake representing an error message or
 552          * wrapping content supplied by an extension. Refer to $this->fetchResult for the
 553          * revision actually loaded from the database.
 554          *
 555          * @since 1.19
 556          * @return Revision|null
 557          */
 558         public function getRevisionFetched() {
 559                 $this->fetchRevisionRecord();
 560
 561                 if ( $this->fetchResult->isOK() ) {
 562                         return $this->mRevision;
 563                 }
 564         }
 565
 566         /**
 567          * Use this to fetch the rev ID used on page views
 568          *
 569          * Before fetchRevisionRecord was called, this returns the page's latest revision,
 570          * regardless of what getOldID() returns.
 571          *
 572          * @return int Revision ID of last article revision
 573          */
 574         public function getRevIdFetched() {
 575                 if ( $this->fetchResult && $this->fetchResult->isOK() ) {
 576                         return $this->fetchResult->value->getId();
 577                 } else {
 578                         return $this->mPage->getLatest();
 579                 }
 580         }
 581
 582         /**
 583          * This is the default action of the index.php entry point: just view the
 584          * page of the given title.
 585          */
 586         public function view() {
 587                 global $wgUseFileCache, $wgDebugToolbar;
 588
 589                 # Get variables from query string
 590                 # As side effect this will load the revision and update the title
 591                 # in a revision ID is passed in the request, so this should remain
 592                 # the first call of this method even if $oldid is used way below.
 593                 $oldid = $this->getOldID();
 594
 595                 $user = $this->getContext()->getUser();
 596                 # Another whitelist check in case getOldID() is altering the title
 597                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 598                 if ( count( $permErrors ) ) {
 599                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 600                         throw new PermissionsError( 'read', $permErrors );
 601                 }
 602
 603                 $outputPage = $this->getContext()->getOutput();
 604                 # getOldID() may as well want us to redirect somewhere else
 605                 if ( $this->mRedirectUrl ) {
 606                         $outputPage->redirect( $this->mRedirectUrl );
 607                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 608
 609                         return;
 610                 }
 611
 612                 # If we got diff in the query, we want to see a diff page instead of the article.
 613                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 614                         wfDebug( __METHOD__ . ": showing diff page\n" );
 615                         $this->showDiffPage();
 616
 617                         return;
 618                 }
 619
 620                 # Set page title (may be overridden by DISPLAYTITLE)
 621                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 622
 623                 $outputPage->setArticleFlag( true );
 624                 # Allow frames by default
 625                 $outputPage->allowClickjacking();
 626
 627                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 628
 629                 $parserOptions = $this->getParserOptions();
 630                 $poOptions = [];
 631                 # Render printable version, use printable version cache
 632                 if ( $outputPage->isPrintable() ) {
 633                         $parserOptions->setIsPrintable( true );
 634                         $poOptions['enableSectionEditLinks'] = false;
 635                 } elseif ( $this->viewIsRenderAction
 636                         || !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user )
 637                 ) {
 638                         $poOptions['enableSectionEditLinks'] = false;
 639                 }
 640
 641                 # Try client and file cache
 642                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 643                         # Try to stream the output from file cache
 644                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 645                                 wfDebug( __METHOD__ . ": done file cache\n" );
 646                                 # tell wgOut that output is taken care of
 647                                 $outputPage->disable();
 648                                 $this->mPage->doViewUpdates( $user, $oldid );
 649
 650                                 return;
 651                         }
 652                 }
 653
 654                 # Should the parser cache be used?
 655                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 656                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 657                 if ( $user->getStubThreshold() ) {
 658                         MediaWikiServices::getInstance()->getStatsdDataFactory()->increment( 'pcache_miss_stub' );
 659                 }
 660
 661                 $this->showRedirectedFromHeader();
 662                 $this->showNamespaceHeader();
 663
 664                 # Iterate through the possible ways of constructing the output text.
 665                 # Keep going until $outputDone is set, or we run out of things to do.
 666                 $pass = 0;
 667                 $outputDone = false;
 668                 $this->mParserOutput = false;
 669
 670                 while ( !$outputDone && ++$pass ) {
 671                         switch ( $pass ) {
 672                                 case 1:
 673                                         // Avoid PHP 7.1 warning of passing $this by reference
 674                                         $articlePage = $this;
 675                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 676                                         break;
 677                                 case 2:
 678                                         # Early abort if the page doesn't exist
 679                                         if ( !$this->mPage->exists() ) {
 680                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 681                                                 $this->showMissingArticle();
 682                                                 $this->mPage->doViewUpdates( $user );
 683                                                 return;
 684                                         }
 685
 686                                         # Try the parser cache
 687                                         if ( $useParserCache ) {
 688                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 689
 690                                                 if ( $this->mParserOutput !== false ) {
 691                                                         if ( $oldid ) {
 692                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 693                                                                 $this->setOldSubtitle( $oldid );
 694                                                         } else {
 695                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 696                                                         }
 697                                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 698                                                         # Ensure that UI elements requiring revision ID have
 699                                                         # the correct version information.
 700                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 701                                                         # Preload timestamp to avoid a DB hit
 702                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 703                                                         if ( $cachedTimestamp !== null ) {
 704                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 705                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 706                                                         }
 707                                                         $outputDone = true;
 708                                                 }
 709                                         }
 710                                         break;
 711                                 case 3:
 712                                         # Are we looking at an old revision
 713                                         $rev = $this->fetchRevisionRecord();
 714                                         if ( $oldid && $this->fetchResult->isOK() ) {
 715                                                 $this->setOldSubtitle( $oldid );
 716
 717                                                 if ( !$this->showDeletedRevisionHeader() ) {
 718                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 719                                                         return;
 720                                                 }
 721                                         }
 722
 723                                         # Ensure that UI elements requiring revision ID have
 724                                         # the correct version information.
 725                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 726                                         # Preload timestamp to avoid a DB hit
 727                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 728
 729                                         # Pages containing custom CSS or JavaScript get special treatment
 730                                         if ( $this->getTitle()->isSiteConfigPage() || $this->getTitle()->isUserConfigPage() ) {
 731                                                 $dir = $this->getContext()->getLanguage()->getDir();
 732                                                 $lang = $this->getContext()->getLanguage()->getHtmlCode();
 733
 734                                                 $outputPage->wrapWikiMsg(
 735                                                         "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 736                                                         'clearyourcache'
 737                                                 );
 738                                         } elseif ( !Hooks::run( 'ArticleRevisionViewCustom', [
 739                                                         $rev,
 740                                                         $this->getTitle(),
 741                                                         $oldid,
 742                                                         $outputPage,
 743                                                 ] )
 744                                         ) {
 745                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 746                                                 // Allow extensions do their own custom view for certain pages
 747                                                 $outputDone = true;
 748                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 749                                                 [ $this->fetchContentObject(), $this->getTitle(), $outputPage ], '1.32' )
 750                                         ) {
 751                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 752                                                 // Allow extensions do their own custom view for certain pages
 753                                                 $outputDone = true;
 754                                         }
 755                                         break;
 756                                 case 4:
 757                                         # Run the parse, protected by a pool counter
 758                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 759
 760                                         $rev = $this->fetchRevisionRecord();
 761                                         $error = null;
 762
 763                                         if ( $rev ) {
 764                                                 $poolArticleView = new PoolWorkArticleView(
 765                                                         $this->getPage(),
 766                                                         $parserOptions,
 767                                                         $this->getRevIdFetched(),
 768                                                         $useParserCache,
 769                                                         $rev,
 770                                                         // permission checking was done earlier via showDeletedRevisionHeader()
 771                                                         RevisionRecord::RAW
 772                                                 );
 773                                                 $ok = $poolArticleView->execute();
 774                                                 $error = $poolArticleView->getError();
 775                                                 $this->mParserOutput = $poolArticleView->getParserOutput() ?: null;
 776
 777                                                 # Don't cache a dirty ParserOutput object
 778                                                 if ( $poolArticleView->getIsDirty() ) {
 779                                                         $outputPage->setCdnMaxage( 0 );
 780                                                         $outputPage->addHTML( "<!-- parser cache is expired, " .
 781                                                                 "sending anyway due to pool overload-->\n" );
 782                                                 }
 783                                         } else {
 784                                                 $ok = false;
 785                                         }
 786
 787                                         if ( !$ok ) {
 788                                                 if ( $error ) {
 789                                                         $outputPage->clearHTML(); // for release() errors
 790                                                         $outputPage->enableClientCache( false );
 791                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 792
 793                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 794                                                         $outputPage->wrapWikiTextAsInterface( 'errorbox', $errortext );
 795                                                 }
 796                                                 # Connection or timeout error
 797                                                 return;
 798                                         }
 799
 800                                         if ( $this->mParserOutput ) {
 801                                                 $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 802                                         }
 803
 804                                         if ( $rev && $this->getRevisionRedirectTarget( $rev ) ) {
 805                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 806                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 807                                         }
 808
 809                                         $outputDone = true;
 810                                         break;
 811                                 # Should be unreachable, but just in case...
 812                                 default:
 813                                         break 2;
 814                         }
 815                 }
 816
 817                 // Get the ParserOutput actually *displayed* here.
 818                 // Note that $this->mParserOutput is the *current*/oldid version output.
 819                 // Note that the ArticleViewHeader hook is allowed to set $outputDone to a
 820                 // ParserOutput instance.
 821                 $pOutput = ( $outputDone instanceof ParserOutput )
 822                         ? $outputDone // object fetched by hook
 823                         : ( $this->mParserOutput ?: null ); // ParserOutput or null, avoid false
 824
 825                 # Adjust title for main page & pages with displaytitle
 826                 if ( $pOutput ) {
 827                         $this->adjustDisplayTitle( $pOutput );
 828                 }
 829
 830                 # For the main page, overwrite the <title> element with the con-
 831                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 832                 # that's not empty).
 833                 # This message always exists because it is in the i18n files
 834                 if ( $this->getTitle()->isMainPage() ) {
 835                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 836                         if ( !$msg->isDisabled() ) {
 837                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 838                         }
 839                 }
 840
 841                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 842                 # This could use getTouched(), but that could be scary for major template edits.
 843                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 844
 845                 # Check for any __NOINDEX__ tags on the page using $pOutput
 846                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 847                 $outputPage->setIndexPolicy( $policy['index'] );
 848                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 849
 850                 $this->showViewFooter();
 851                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 852
 853                 # Load the postEdit module if the user just saved this revision
 854                 # See also EditPage::setPostEditCookie
 855                 $request = $this->getContext()->getRequest();
 856                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 857                 $postEdit = $request->getCookie( $cookieKey );
 858                 if ( $postEdit ) {
 859                         # Clear the cookie. This also prevents caching of the response.
 860                         $request->response()->clearCookie( $cookieKey );
 861                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 862                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 863                 }
 864         }
 865
 866         /**
 867          * @param RevisionRecord $revision
 868          * @return null|Title
 869          */
 870         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 871                 // TODO: find a *good* place for the code that determines the redirect target for
 872                 // a given revision!
 873                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 874                 $content = $revision->getContent( SlotRecord::MAIN );
 875                 return $content ? $content->getRedirectTarget() : null;
 876         }
 877
 878         /**
 879          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 880          * @param ParserOutput $pOutput
 881          */
 882         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 883                 $out = $this->getContext()->getOutput();
 884
 885                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 886                 $titleText = $pOutput->getTitleText();
 887                 if ( strval( $titleText ) !== '' ) {
 888                         $out->setPageTitle( $titleText );
 889                         $out->setDisplayTitle( $titleText );
 890                 }
 891         }
 892
 893         /**
 894          * Show a diff page according to current request variables. For use within
 895          * Article::view() only, other callers should use the DifferenceEngine class.
 896          */
 897         protected function showDiffPage() {
 898                 $request = $this->getContext()->getRequest();
 899                 $user = $this->getContext()->getUser();
 900                 $diff = $request->getVal( 'diff' );
 901                 $rcid = $request->getVal( 'rcid' );
 902                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 903                 $purge = $request->getVal( 'action' ) == 'purge';
 904                 $unhide = $request->getInt( 'unhide' ) == 1;
 905                 $oldid = $this->getOldID();
 906
 907                 $rev = $this->getRevisionFetched();
 908
 909                 if ( !$rev ) {
 910                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 911                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 912                                 ->params( $oldid )
 913                                 ->numParams( 1 )
 914                                 ->parseAsBlock();
 915                         $this->getContext()->getOutput()->addHTML( $msg );
 916                         return;
 917                 }
 918
 919                 $contentHandler = $rev->getContentHandler();
 920                 $de = $contentHandler->createDifferenceEngine(
 921                         $this->getContext(),
 922                         $oldid,
 923                         $diff,
 924                         $rcid,
 925                         $purge,
 926                         $unhide
 927                 );
 928
 929                 // DifferenceEngine directly fetched the revision:
 930                 $this->mRevIdFetched = $de->getNewid();
 931                 $de->showDiffPage( $diffOnly );
 932
 933                 // Run view updates for the newer revision being diffed (and shown
 934                 // below the diff if not $diffOnly).
 935                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 936                 // New can be false, convert it to 0 - this conveniently means the latest revision
 937                 $this->mPage->doViewUpdates( $user, (int)$new );
 938         }
 939
 940         /**
 941          * Get the robot policy to be used for the current view
 942          * @param string $action The action= GET parameter
 943          * @param ParserOutput|null $pOutput
 944          * @return array The policy that should be set
 945          * @todo actions other than 'view'
 946          */
 947         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 948                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 949
 950                 $ns = $this->getTitle()->getNamespace();
 951
 952                 # Don't index user and user talk pages for blocked users (T13443)
 953                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 954                         $specificTarget = null;
 955                         $vagueTarget = null;
 956                         $titleText = $this->getTitle()->getText();
 957                         if ( IP::isValid( $titleText ) ) {
 958                                 $vagueTarget = $titleText;
 959                         } else {
 960                                 $specificTarget = $titleText;
 961                         }
 962                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 963                                 return [
 964                                         'index' => 'noindex',
 965                                         'follow' => 'nofollow'
 966                                 ];
 967                         }
 968                 }
 969
 970                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 971                         # Non-articles (special pages etc), and old revisions
 972                         return [
 973                                 'index' => 'noindex',
 974                                 'follow' => 'nofollow'
 975                         ];
 976                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 977                         # Discourage indexing of printable versions, but encourage following
 978                         return [
 979                                 'index' => 'noindex',
 980                                 'follow' => 'follow'
 981                         ];
 982                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 983                         # For ?curid=x urls, disallow indexing
 984                         return [
 985                                 'index' => 'noindex',
 986                                 'follow' => 'follow'
 987                         ];
 988                 }
 989
 990                 # Otherwise, construct the policy based on the various config variables.
 991                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 992
 993                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 994                         # Honour customised robot policies for this namespace
 995                         $policy = array_merge(
 996                                 $policy,
 997                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 998                         );
 999                 }
1000                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1001                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1002                         # a final sanity check that we have really got the parser output.
1003                         $policy = array_merge(
1004                                 $policy,
1005                                 [ 'index' => $pOutput->getIndexPolicy() ]
1006                         );
1007                 }
1008
1009                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1010                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1011                         $policy = array_merge(
1012                                 $policy,
1013                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1014                         );
1015                 }
1016
1017                 return $policy;
1018         }
1019
1020         /**
1021          * Converts a String robot policy into an associative array, to allow
1022          * merging of several policies using array_merge().
1023          * @param array|string $policy Returns empty array on null/false/'', transparent
1024          *   to already-converted arrays, converts string.
1025          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1026          */
1027         public static function formatRobotPolicy( $policy ) {
1028                 if ( is_array( $policy ) ) {
1029                         return $policy;
1030                 } elseif ( !$policy ) {
1031                         return [];
1032                 }
1033
1034                 $policy = explode( ',', $policy );
1035                 $policy = array_map( 'trim', $policy );
1036
1037                 $arr = [];
1038                 foreach ( $policy as $var ) {
1039                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1040                                 $arr['index'] = $var;
1041                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1042                                 $arr['follow'] = $var;
1043                         }
1044                 }
1045
1046                 return $arr;
1047         }
1048
1049         /**
1050          * If this request is a redirect view, send "redirected from" subtitle to
1051          * the output. Returns true if the header was needed, false if this is not
1052          * a redirect view. Handles both local and remote redirects.
1053          *
1054          * @return bool
1055          */
1056         public function showRedirectedFromHeader() {
1057                 global $wgRedirectSources;
1058
1059                 $context = $this->getContext();
1060                 $outputPage = $context->getOutput();
1061                 $request = $context->getRequest();
1062                 $rdfrom = $request->getVal( 'rdfrom' );
1063
1064                 // Construct a URL for the current page view, but with the target title
1065                 $query = $request->getValues();
1066                 unset( $query['rdfrom'] );
1067                 unset( $query['title'] );
1068                 if ( $this->getTitle()->isRedirect() ) {
1069                         // Prevent double redirects
1070                         $query['redirect'] = 'no';
1071                 }
1072                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1073
1074                 if ( isset( $this->mRedirectedFrom ) ) {
1075                         // Avoid PHP 7.1 warning of passing $this by reference
1076                         $articlePage = $this;
1077
1078                         // This is an internally redirected page view.
1079                         // We'll need a backlink to the source page for navigation.
1080                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1081                                 $redir = Linker::linkKnown(
1082                                         $this->mRedirectedFrom,
1083                                         null,
1084                                         [],
1085                                         [ 'redirect' => 'no' ]
1086                                 );
1087
1088                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1089                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1090                                 . "</span>" );
1091
1092                                 // Add the script to update the displayed URL and
1093                                 // set the fragment if one was specified in the redirect
1094                                 $outputPage->addJsConfigVars( [
1095                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1096                                 ] );
1097                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1098
1099                                 // Add a <link rel="canonical"> tag
1100                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1101
1102                                 // Tell the output object that the user arrived at this article through a redirect
1103                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1104
1105                                 return true;
1106                         }
1107                 } elseif ( $rdfrom ) {
1108                         // This is an externally redirected view, from some other wiki.
1109                         // If it was reported from a trusted site, supply a backlink.
1110                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1111                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1112                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1113                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1114                                 . "</span>" );
1115
1116                                 // Add the script to update the displayed URL
1117                                 $outputPage->addJsConfigVars( [
1118                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1119                                 ] );
1120                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1121
1122                                 return true;
1123                         }
1124                 }
1125
1126                 return false;
1127         }
1128
1129         /**
1130          * Show a header specific to the namespace currently being viewed, like
1131          * [[MediaWiki:Talkpagetext]]. For Article::view().
1132          */
1133         public function showNamespaceHeader() {
1134                 if ( $this->getTitle()->isTalkPage() ) {
1135                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1136                                 $this->getContext()->getOutput()->wrapWikiMsg(
1137                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1138                                         [ 'talkpageheader' ]
1139                                 );
1140                         }
1141                 }
1142         }
1143
1144         /**
1145          * Show the footer section of an ordinary page view
1146          */
1147         public function showViewFooter() {
1148                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1149                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1150                         && IP::isValid( $this->getTitle()->getText() )
1151                 ) {
1152                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1153                 }
1154
1155                 // Show a footer allowing the user to patrol the shown revision or page if possible
1156                 $patrolFooterShown = $this->showPatrolFooter();
1157
1158                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1159         }
1160
1161         /**
1162          * If patrol is possible, output a patrol UI box. This is called from the
1163          * footer section of ordinary page views. If patrol is not possible or not
1164          * desired, does nothing.
1165          * Side effect: When the patrol link is build, this method will call
1166          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1167          *
1168          * @return bool
1169          */
1170         public function showPatrolFooter() {
1171                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1172
1173                 // Allow hooks to decide whether to not output this at all
1174                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1175                         return false;
1176                 }
1177
1178                 $outputPage = $this->getContext()->getOutput();
1179                 $user = $this->getContext()->getUser();
1180                 $title = $this->getTitle();
1181                 $rc = false;
1182
1183                 if ( !$title->quickUserCan( 'patrol', $user )
1184                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1185                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1186                 ) {
1187                         // Patrolling is disabled or the user isn't allowed to
1188                         return false;
1189                 }
1190
1191                 if ( $this->mRevision
1192                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1193                 ) {
1194                         // The current revision is already older than what could be in the RC table
1195                         // 6h tolerance because the RC might not be cleaned out regularly
1196                         return false;
1197                 }
1198
1199                 // Check for cached results
1200                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1201                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1202                 if ( $cache->get( $key ) ) {
1203                         return false;
1204                 }
1205
1206                 $dbr = wfGetDB( DB_REPLICA );
1207                 $oldestRevisionTimestamp = $dbr->selectField(
1208                         'revision',
1209                         'MIN( rev_timestamp )',
1210                         [ 'rev_page' => $title->getArticleID() ],
1211                         __METHOD__
1212                 );
1213
1214                 // New page patrol: Get the timestamp of the oldest revison which
1215                 // the revision table holds for the given page. Then we look
1216                 // whether it's within the RC lifespan and if it is, we try
1217                 // to get the recentchanges row belonging to that entry
1218                 // (with rc_new = 1).
1219                 $recentPageCreation = false;
1220                 if ( $oldestRevisionTimestamp
1221                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1222                 ) {
1223                         // 6h tolerance because the RC might not be cleaned out regularly
1224                         $recentPageCreation = true;
1225                         $rc = RecentChange::newFromConds(
1226                                 [
1227                                         'rc_new' => 1,
1228                                         'rc_timestamp' => $oldestRevisionTimestamp,
1229                                         'rc_namespace' => $title->getNamespace(),
1230                                         'rc_cur_id' => $title->getArticleID()
1231                                 ],
1232                                 __METHOD__
1233                         );
1234                         if ( $rc ) {
1235                                 // Use generic patrol message for new pages
1236                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1237                         }
1238                 }
1239
1240                 // File patrol: Get the timestamp of the latest upload for this page,
1241                 // check whether it is within the RC lifespan and if it is, we try
1242                 // to get the recentchanges row belonging to that entry
1243                 // (with rc_type = RC_LOG, rc_log_type = upload).
1244                 $recentFileUpload = false;
1245                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1246                         && $title->getNamespace() === NS_FILE ) {
1247                         // Retrieve timestamp of most recent upload
1248                         $newestUploadTimestamp = $dbr->selectField(
1249                                 'image',
1250                                 'MAX( img_timestamp )',
1251                                 [ 'img_name' => $title->getDBkey() ],
1252                                 __METHOD__
1253                         );
1254                         if ( $newestUploadTimestamp
1255                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1256                         ) {
1257                                 // 6h tolerance because the RC might not be cleaned out regularly
1258                                 $recentFileUpload = true;
1259                                 $rc = RecentChange::newFromConds(
1260                                         [
1261                                                 'rc_type' => RC_LOG,
1262                                                 'rc_log_type' => 'upload',
1263                                                 'rc_timestamp' => $newestUploadTimestamp,
1264                                                 'rc_namespace' => NS_FILE,
1265                                                 'rc_cur_id' => $title->getArticleID()
1266                                         ],
1267                                         __METHOD__
1268                                 );
1269                                 if ( $rc ) {
1270                                         // Use patrol message specific to files
1271                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1272                                 }
1273                         }
1274                 }
1275
1276                 if ( !$recentPageCreation && !$recentFileUpload ) {
1277                         // Page creation and latest upload (for files) is too old to be in RC
1278
1279                         // We definitely can't patrol so cache the information
1280                         // When a new file version is uploaded, the cache is cleared
1281                         $cache->set( $key, '1' );
1282
1283                         return false;
1284                 }
1285
1286                 if ( !$rc ) {
1287                         // Don't cache: This can be hit if the page gets accessed very fast after
1288                         // its creation / latest upload or in case we have high replica DB lag. In case
1289                         // the revision is too old, we will already return above.
1290                         return false;
1291                 }
1292
1293                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1294                         // Patrolled RC entry around
1295
1296                         // Cache the information we gathered above in case we can't patrol
1297                         // Don't cache in case we can patrol as this could change
1298                         $cache->set( $key, '1' );
1299
1300                         return false;
1301                 }
1302
1303                 if ( $rc->getPerformer()->equals( $user ) ) {
1304                         // Don't show a patrol link for own creations/uploads. If the user could
1305                         // patrol them, they already would be patrolled
1306                         return false;
1307                 }
1308
1309                 $outputPage->preventClickjacking();
1310                 if ( $user->isAllowed( 'writeapi' ) ) {
1311                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1312                 }
1313
1314                 $link = Linker::linkKnown(
1315                         $title,
1316                         $markPatrolledMsg->escaped(),
1317                         [],
1318                         [
1319                                 'action' => 'markpatrolled',
1320                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1321                         ]
1322                 );
1323
1324                 $outputPage->addHTML(
1325                         "<div class='patrollink' data-mw='interface'>" .
1326                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1327                         '</div>'
1328                 );
1329
1330                 return true;
1331         }
1332
1333         /**
1334          * Purge the cache used to check if it is worth showing the patrol footer
1335          * For example, it is done during re-uploads when file patrol is used.
1336          * @param int $articleID ID of the article to purge
1337          * @since 1.27
1338          */
1339         public static function purgePatrolFooterCache( $articleID ) {
1340                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1341                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1342         }
1343
1344         /**
1345          * Show the error text for a missing article. For articles in the MediaWiki
1346          * namespace, show the default message text. To be called from Article::view().
1347          */
1348         public function showMissingArticle() {
1349                 global $wgSend404Code;
1350
1351                 $outputPage = $this->getContext()->getOutput();
1352                 // Whether the page is a root user page of an existing user (but not a subpage)
1353                 $validUserPage = false;
1354
1355                 $title = $this->getTitle();
1356
1357                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1358                 if ( $title->getNamespace() == NS_USER
1359                         || $title->getNamespace() == NS_USER_TALK
1360                 ) {
1361                         $rootPart = explode( '/', $title->getText() )[0];
1362                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1363                         $ip = User::isIP( $rootPart );
1364                         $block = Block::newFromTarget( $user, $user );
1365
1366                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1367                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1368                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1369                         } elseif (
1370                                 !is_null( $block ) &&
1371                                 $block->getType() != Block::TYPE_AUTO &&
1372                                 ( $block->isSitewide() || $user->isBlockedFrom( $title ) )
1373                         ) {
1374                                 // Show log extract if the user is sitewide blocked or is partially
1375                                 // blocked and not allowed to edit their user page or user talk page
1376                                 LogEventsList::showLogExtract(
1377                                         $outputPage,
1378                                         'block',
1379                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1380                                         '',
1381                                         [
1382                                                 'lim' => 1,
1383                                                 'showIfEmpty' => false,
1384                                                 'msgKey' => [
1385                                                         'blocked-notice-logextract',
1386                                                         $user->getName() # Support GENDER in notice
1387                                                 ]
1388                                         ]
1389                                 );
1390                                 $validUserPage = !$title->isSubpage();
1391                         } else {
1392                                 $validUserPage = !$title->isSubpage();
1393                         }
1394                 }
1395
1396                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1397
1398                 # Show delete and move logs if there were any such events.
1399                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1400                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1401                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
1402                 $key = $cache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1403                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1404                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1405                 if ( $loggedIn || $cache->get( $key ) || $sessionExists ) {
1406                         $logTypes = [ 'delete', 'move', 'protect' ];
1407
1408                         $dbr = wfGetDB( DB_REPLICA );
1409
1410                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1411                         // Give extensions a chance to hide their (unrelated) log entries
1412                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1413                         LogEventsList::showLogExtract(
1414                                 $outputPage,
1415                                 $logTypes,
1416                                 $title,
1417                                 '',
1418                                 [
1419                                         'lim' => 10,
1420                                         'conds' => $conds,
1421                                         'showIfEmpty' => false,
1422                                         'msgKey' => [ $loggedIn || $sessionExists
1423                                                 ? 'moveddeleted-notice'
1424                                                 : 'moveddeleted-notice-recent'
1425                                         ]
1426                                 ]
1427                         );
1428                 }
1429
1430                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1431                         // If there's no backing content, send a 404 Not Found
1432                         // for better machine handling of broken links.
1433                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1434                 }
1435
1436                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1437                 $policy = $this->getRobotPolicy( 'view' );
1438                 $outputPage->setIndexPolicy( $policy['index'] );
1439                 $outputPage->setFollowPolicy( $policy['follow'] );
1440
1441                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1442
1443                 if ( !$hookResult ) {
1444                         return;
1445                 }
1446
1447                 # Show error message
1448                 $oldid = $this->getOldID();
1449                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1450                         // use fake Content object for system message
1451                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1452                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1453                 } else {
1454                         if ( $oldid ) {
1455                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1456                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1457                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1458                         ) {
1459                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1460                                 $text = wfMessage( $message )->plain();
1461                         } else {
1462                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1463                         }
1464
1465                         $dir = $this->getContext()->getLanguage()->getDir();
1466                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1467                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1468                                 'class' => "noarticletext mw-content-$dir",
1469                                 'dir' => $dir,
1470                                 'lang' => $lang,
1471                         ] ) . "\n$text\n</div>" );
1472                 }
1473         }
1474
1475         /**
1476          * If the revision requested for view is deleted, check permissions.
1477          * Send either an error message or a warning header to the output.
1478          *
1479          * @return bool True if the view is allowed, false if not.
1480          */
1481         public function showDeletedRevisionHeader() {
1482                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1483                         // Not deleted
1484                         return true;
1485                 }
1486
1487                 $outputPage = $this->getContext()->getOutput();
1488                 $user = $this->getContext()->getUser();
1489                 // If the user is not allowed to see it...
1490                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1491                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1492                                 'rev-deleted-text-permission' );
1493
1494                         return false;
1495                 // If the user needs to confirm that they want to see it...
1496                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1497                         # Give explanation and add a link to view the revision...
1498                         $oldid = intval( $this->getOldID() );
1499                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1500                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1501                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1502                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1503                                 [ $msg, $link ] );
1504
1505                         return false;
1506                 // We are allowed to see...
1507                 } else {
1508                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1509                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1510                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1511
1512                         return true;
1513                 }
1514         }
1515
1516         /**
1517          * Generate the navigation links when browsing through an article revisions
1518          * It shows the information as:
1519          *   Revision as of \<date\>; view current revision
1520          *   \<- Previous version | Next Version -\>
1521          *
1522          * @param int $oldid Revision ID of this article revision
1523          */
1524         public function setOldSubtitle( $oldid = 0 ) {
1525                 // Avoid PHP 7.1 warning of passing $this by reference
1526                 $articlePage = $this;
1527
1528                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1529                         return;
1530                 }
1531
1532                 $context = $this->getContext();
1533                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1534
1535                 # Cascade unhide param in links for easy deletion browsing
1536                 $extraParams = [];
1537                 if ( $unhide ) {
1538                         $extraParams['unhide'] = 1;
1539                 }
1540
1541                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1542                         $revision = $this->mRevision;
1543                 } else {
1544                         $revision = Revision::newFromId( $oldid );
1545                 }
1546
1547                 $timestamp = $revision->getTimestamp();
1548
1549                 $current = ( $oldid == $this->mPage->getLatest() );
1550                 $language = $context->getLanguage();
1551                 $user = $context->getUser();
1552
1553                 $td = $language->userTimeAndDate( $timestamp, $user );
1554                 $tddate = $language->userDate( $timestamp, $user );
1555                 $tdtime = $language->userTime( $timestamp, $user );
1556
1557                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1558                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1559
1560                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1561                         ? 'revision-info-current'
1562                         : 'revision-info';
1563
1564                 $outputPage = $context->getOutput();
1565                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1566                         $context->msg( $infomsg, $td )
1567                                 ->rawParams( $userlinks )
1568                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1569                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1570                                 ->parse() .
1571                         "</div>";
1572
1573                 $lnk = $current
1574                         ? $context->msg( 'currentrevisionlink' )->escaped()
1575                         : Linker::linkKnown(
1576                                 $this->getTitle(),
1577                                 $context->msg( 'currentrevisionlink' )->escaped(),
1578                                 [],
1579                                 $extraParams
1580                         );
1581                 $curdiff = $current
1582                         ? $context->msg( 'diff' )->escaped()
1583                         : Linker::linkKnown(
1584                                 $this->getTitle(),
1585                                 $context->msg( 'diff' )->escaped(),
1586                                 [],
1587                                 [
1588                                         'diff' => 'cur',
1589                                         'oldid' => $oldid
1590                                 ] + $extraParams
1591                         );
1592                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1593                 $prevlink = $prev
1594                         ? Linker::linkKnown(
1595                                 $this->getTitle(),
1596                                 $context->msg( 'previousrevision' )->escaped(),
1597                                 [],
1598                                 [
1599                                         'direction' => 'prev',
1600                                         'oldid' => $oldid
1601                                 ] + $extraParams
1602                         )
1603                         : $context->msg( 'previousrevision' )->escaped();
1604                 $prevdiff = $prev
1605                         ? Linker::linkKnown(
1606                                 $this->getTitle(),
1607                                 $context->msg( 'diff' )->escaped(),
1608                                 [],
1609                                 [
1610                                         'diff' => 'prev',
1611                                         'oldid' => $oldid
1612                                 ] + $extraParams
1613                         )
1614                         : $context->msg( 'diff' )->escaped();
1615                 $nextlink = $current
1616                         ? $context->msg( 'nextrevision' )->escaped()
1617                         : Linker::linkKnown(
1618                                 $this->getTitle(),
1619                                 $context->msg( 'nextrevision' )->escaped(),
1620                                 [],
1621                                 [
1622                                         'direction' => 'next',
1623                                         'oldid' => $oldid
1624                                 ] + $extraParams
1625                         );
1626                 $nextdiff = $current
1627                         ? $context->msg( 'diff' )->escaped()
1628                         : Linker::linkKnown(
1629                                 $this->getTitle(),
1630                                 $context->msg( 'diff' )->escaped(),
1631                                 [],
1632                                 [
1633                                         'diff' => 'next',
1634                                         'oldid' => $oldid
1635                                 ] + $extraParams
1636                         );
1637
1638                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1639                 if ( $cdel !== '' ) {
1640                         $cdel .= ' ';
1641                 }
1642
1643                 // the outer div is need for styling the revision info and nav in MobileFrontend
1644                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1645                         "<div id=\"mw-revision-nav\">" . $cdel .
1646                         $context->msg( 'revision-nav' )->rawParams(
1647                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1648                         )->escaped() . "</div></div>" );
1649         }
1650
1651         /**
1652          * Return the HTML for the top of a redirect page
1653          *
1654          * Chances are you should just be using the ParserOutput from
1655          * WikitextContent::getParserOutput instead of calling this for redirects.
1656          *
1657          * @param Title|array $target Destination(s) to redirect
1658          * @param bool $appendSubtitle [optional]
1659          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1660          * @return string Containing HTML with redirect link
1661          *
1662          * @deprecated since 1.30
1663          */
1664         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1665                 $lang = $this->getTitle()->getPageLanguage();
1666                 $out = $this->getContext()->getOutput();
1667                 if ( $appendSubtitle ) {
1668                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1669                 }
1670                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1671                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1672         }
1673
1674         /**
1675          * Return the HTML for the top of a redirect page
1676          *
1677          * Chances are you should just be using the ParserOutput from
1678          * WikitextContent::getParserOutput instead of calling this for redirects.
1679          *
1680          * @since 1.23
1681          * @param Language $lang
1682          * @param Title|array $target Destination(s) to redirect
1683          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1684          * @return string Containing HTML with redirect link
1685          */
1686         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1687                 if ( !is_array( $target ) ) {
1688                         $target = [ $target ];
1689                 }
1690
1691                 $html = '<ul class="redirectText">';
1692                 /** @var Title $title */
1693                 foreach ( $target as $title ) {
1694                         $html .= '<li>' . Linker::link(
1695                                 $title,
1696                                 htmlspecialchars( $title->getFullText() ),
1697                                 [],
1698                                 // Make sure wiki page redirects are not followed
1699                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1700                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1701                         ) . '</li>';
1702                 }
1703                 $html .= '</ul>';
1704
1705                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1706
1707                 return '<div class="redirectMsg">' .
1708                         '<p>' . $redirectToText . '</p>' .
1709                         $html .
1710                         '</div>';
1711         }
1712
1713         /**
1714          * Adds help link with an icon via page indicators.
1715          * Link target can be overridden by a local message containing a wikilink:
1716          * the message key is: 'namespace-' + namespace number + '-helppage'.
1717          * @param string $to Target MediaWiki.org page title or encoded URL.
1718          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1719          * @since 1.25
1720          */
1721         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1722                 $msg = wfMessage(
1723                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1724                 );
1725
1726                 $out = $this->getContext()->getOutput();
1727                 if ( !$msg->isDisabled() ) {
1728                         $helpUrl = Skin::makeUrl( $msg->plain() );
1729                         $out->addHelpLink( $helpUrl, true );
1730                 } else {
1731                         $out->addHelpLink( $to, $overrideBaseUrl );
1732                 }
1733         }
1734
1735         /**
1736          * Handle action=render
1737          */
1738         public function render() {
1739                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1740                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1741                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1742                 $this->viewIsRenderAction = true;
1743                 $this->view();
1744         }
1745
1746         /**
1747          * action=protect handler
1748          */
1749         public function protect() {
1750                 $form = new ProtectionForm( $this );
1751                 $form->execute();
1752         }
1753
1754         /**
1755          * action=unprotect handler (alias)
1756          */
1757         public function unprotect() {
1758                 $this->protect();
1759         }
1760
1761         /**
1762          * UI entry point for page deletion
1763          */
1764         public function delete() {
1765                 # This code desperately needs to be totally rewritten
1766
1767                 $title = $this->getTitle();
1768                 $context = $this->getContext();
1769                 $user = $context->getUser();
1770                 $request = $context->getRequest();
1771
1772                 # Check permissions
1773                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1774                 if ( count( $permissionErrors ) ) {
1775                         throw new PermissionsError( 'delete', $permissionErrors );
1776                 }
1777
1778                 # Read-only check...
1779                 if ( wfReadOnly() ) {
1780                         throw new ReadOnlyError;
1781                 }
1782
1783                 # Better double-check that it hasn't been deleted yet!
1784                 $this->mPage->loadPageData(
1785                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1786                 );
1787                 if ( !$this->mPage->exists() ) {
1788                         $deleteLogPage = new LogPage( 'delete' );
1789                         $outputPage = $context->getOutput();
1790                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1791                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1792                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1793                                 );
1794                         $outputPage->addHTML(
1795                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1796                         );
1797                         LogEventsList::showLogExtract(
1798                                 $outputPage,
1799                                 'delete',
1800                                 $title
1801                         );
1802
1803                         return;
1804                 }
1805
1806                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1807                 $deleteReason = $request->getText( 'wpReason' );
1808
1809                 if ( $deleteReasonList == 'other' ) {
1810                         $reason = $deleteReason;
1811                 } elseif ( $deleteReason != '' ) {
1812                         // Entry from drop down menu + additional comment
1813                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1814                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1815                 } else {
1816                         $reason = $deleteReasonList;
1817                 }
1818
1819                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1820                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1821                 ) {
1822                         # Flag to hide all contents of the archived revisions
1823                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1824
1825                         $this->doDelete( $reason, $suppress );
1826
1827                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1828
1829                         return;
1830                 }
1831
1832                 // Generate deletion reason
1833                 $hasHistory = false;
1834                 if ( !$reason ) {
1835                         try {
1836                                 $reason = $this->generateReason( $hasHistory );
1837                         } catch ( Exception $e ) {
1838                                 # if a page is horribly broken, we still want to be able to
1839                                 # delete it. So be lenient about errors here.
1840                                 wfDebug( "Error while building auto delete summary: $e" );
1841                                 $reason = '';
1842                         }
1843                 }
1844
1845                 // If the page has a history, insert a warning
1846                 if ( $hasHistory ) {
1847                         $title = $this->getTitle();
1848
1849                         // The following can use the real revision count as this is only being shown for users
1850                         // that can delete this page.
1851                         // This, as a side-effect, also makes sure that the following query isn't being run for
1852                         // pages with a larger history, unless the user has the 'bigdelete' right
1853                         // (and is about to delete this page).
1854                         $dbr = wfGetDB( DB_REPLICA );
1855                         $revisions = $edits = (int)$dbr->selectField(
1856                                 'revision',
1857                                 'COUNT(rev_page)',
1858                                 [ 'rev_page' => $title->getArticleID() ],
1859                                 __METHOD__
1860                         );
1861
1862                         // @todo i18n issue/patchwork message
1863                         $context->getOutput()->addHTML(
1864                                 '<strong class="mw-delete-warning-revisions">' .
1865                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1866                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1867                                         $context->msg( 'history' )->escaped(),
1868                                         [],
1869                                         [ 'action' => 'history' ] ) .
1870                                 '</strong>'
1871                         );
1872
1873                         if ( $title->isBigDeletion() ) {
1874                                 global $wgDeleteRevisionsLimit;
1875                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1876                                         [
1877                                                 'delete-warning-toobig',
1878                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1879                                         ]
1880                                 );
1881                         }
1882                 }
1883
1884                 $this->confirmDelete( $reason );
1885         }
1886
1887         /**
1888          * Output deletion confirmation dialog
1889          * @todo Move to another file?
1890          * @param string $reason Prefilled reason
1891          */
1892         public function confirmDelete( $reason ) {
1893                 wfDebug( "Article::confirmDelete\n" );
1894
1895                 $title = $this->getTitle();
1896                 $ctx = $this->getContext();
1897                 $outputPage = $ctx->getOutput();
1898                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1899                 $outputPage->addBacklinkSubtitle( $title );
1900                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1901                 $outputPage->addModules( 'mediawiki.action.delete' );
1902
1903                 $backlinkCache = $title->getBacklinkCache();
1904                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1905                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1906                                 'deleting-backlinks-warning' );
1907                 }
1908
1909                 $subpageQueryLimit = 51;
1910                 $subpages = $title->getSubpages( $subpageQueryLimit );
1911                 $subpageCount = count( $subpages );
1912                 if ( $subpageCount > 0 ) {
1913                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1914                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1915                 }
1916                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1917
1918                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1919
1920                 $user = $this->getContext()->getUser();
1921                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1922
1923                 $outputPage->enableOOUI();
1924
1925                 $options = Xml::listDropDownOptions(
1926                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1927                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1928                 );
1929                 $options = Xml::listDropDownOptionsOoui( $options );
1930
1931                 $fields[] = new OOUI\FieldLayout(
1932                         new OOUI\DropdownInputWidget( [
1933                                 'name' => 'wpDeleteReasonList',
1934                                 'inputId' => 'wpDeleteReasonList',
1935                                 'tabIndex' => 1,
1936                                 'infusable' => true,
1937                                 'value' => '',
1938                                 'options' => $options
1939                         ] ),
1940                         [
1941                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1942                                 'align' => 'top',
1943                         ]
1944                 );
1945
1946                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1947                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1948                 // Unicode codepoints.
1949                 $fields[] = new OOUI\FieldLayout(
1950                         new OOUI\TextInputWidget( [
1951                                 'name' => 'wpReason',
1952                                 'inputId' => 'wpReason',
1953                                 'tabIndex' => 2,
1954                                 'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
1955                                 'infusable' => true,
1956                                 'value' => $reason,
1957                                 'autofocus' => true,
1958                         ] ),
1959                         [
1960                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1961                                 'align' => 'top',
1962                         ]
1963                 );
1964
1965                 if ( $user->isLoggedIn() ) {
1966                         $fields[] = new OOUI\FieldLayout(
1967                                 new OOUI\CheckboxInputWidget( [
1968                                         'name' => 'wpWatch',
1969                                         'inputId' => 'wpWatch',
1970                                         'tabIndex' => 3,
1971                                         'selected' => $checkWatch,
1972                                 ] ),
1973                                 [
1974                                         'label' => $ctx->msg( 'watchthis' )->text(),
1975                                         'align' => 'inline',
1976                                         'infusable' => true,
1977                                 ]
1978                         );
1979                 }
1980
1981                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1982                         $fields[] = new OOUI\FieldLayout(
1983                                 new OOUI\CheckboxInputWidget( [
1984                                         'name' => 'wpSuppress',
1985                                         'inputId' => 'wpSuppress',
1986                                         'tabIndex' => 4,
1987                                 ] ),
1988                                 [
1989                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1990                                         'align' => 'inline',
1991                                         'infusable' => true,
1992                                 ]
1993                         );
1994                 }
1995
1996                 $fields[] = new OOUI\FieldLayout(
1997                         new OOUI\ButtonInputWidget( [
1998                                 'name' => 'wpConfirmB',
1999                                 'inputId' => 'wpConfirmB',
2000                                 'tabIndex' => 5,
2001                                 'value' => $ctx->msg( 'deletepage' )->text(),
2002                                 'label' => $ctx->msg( 'deletepage' )->text(),
2003                                 'flags' => [ 'primary', 'destructive' ],
2004                                 'type' => 'submit',
2005                         ] ),
2006                         [
2007                                 'align' => 'top',
2008                         ]
2009                 );
2010
2011                 $fieldset = new OOUI\FieldsetLayout( [
2012                         'label' => $ctx->msg( 'delete-legend' )->text(),
2013                         'id' => 'mw-delete-table',
2014                         'items' => $fields,
2015                 ] );
2016
2017                 $form = new OOUI\FormLayout( [
2018                         'method' => 'post',
2019                         'action' => $title->getLocalURL( 'action=delete' ),
2020                         'id' => 'deleteconfirm',
2021                 ] );
2022                 $form->appendContent(
2023                         $fieldset,
2024                         new OOUI\HtmlSnippet(
2025                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2026                         )
2027                 );
2028
2029                 $outputPage->addHTML(
2030                         new OOUI\PanelLayout( [
2031                                 'classes' => [ 'deletepage-wrapper' ],
2032                                 'expanded' => false,
2033                                 'padded' => true,
2034                                 'framed' => true,
2035                                 'content' => $form,
2036                         ] )
2037                 );
2038
2039                 if ( $user->isAllowed( 'editinterface' ) ) {
2040                         $link = Linker::linkKnown(
2041                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2042                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2043                                 [],
2044                                 [ 'action' => 'edit' ]
2045                         );
2046                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2047                 }
2048
2049                 $deleteLogPage = new LogPage( 'delete' );
2050                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2051                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2052         }
2053
2054         /**
2055          * Perform a deletion and output success or failure messages
2056          * @param string $reason
2057          * @param bool $suppress
2058          * @param bool $immediate false allows deleting over time via the job queue
2059          * @throws FatalError
2060          * @throws MWException
2061          */
2062         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2063                 $error = '';
2064                 $context = $this->getContext();
2065                 $outputPage = $context->getOutput();
2066                 $user = $context->getUser();
2067                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2068                         [], 'delete', $immediate );
2069
2070                 if ( $status->isOK() ) {
2071                         $deleted = $this->getTitle()->getPrefixedText();
2072
2073                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2074                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2075
2076                         if ( $status->isGood() ) {
2077                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2078                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2079                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2080                         } else {
2081                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2082                         }
2083
2084                         $outputPage->returnToMain( false );
2085                 } else {
2086                         $outputPage->setPageTitle(
2087                                 wfMessage( 'cannotdelete-title',
2088                                         $this->getTitle()->getPrefixedText() )
2089                         );
2090
2091                         if ( $error == '' ) {
2092                                 $outputPage->wrapWikiTextAsInterface(
2093                                         'error mw-error-cannotdelete',
2094                                         $status->getWikiText()
2095                                 );
2096                                 $deleteLogPage = new LogPage( 'delete' );
2097                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2098
2099                                 LogEventsList::showLogExtract(
2100                                         $outputPage,
2101                                         'delete',
2102                                         $this->getTitle()
2103                                 );
2104                         } else {
2105                                 $outputPage->addHTML( $error );
2106                         }
2107                 }
2108         }
2109
2110         /* Caching functions */
2111
2112         /**
2113          * checkLastModified returns true if it has taken care of all
2114          * output to the client that is necessary for this request.
2115          * (that is, it has sent a cached version of the page)
2116          *
2117          * @return bool True if cached version send, false otherwise
2118          */
2119         protected function tryFileCache() {
2120                 static $called = false;
2121
2122                 if ( $called ) {
2123                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2124                         return false;
2125                 }
2126
2127                 $called = true;
2128                 if ( $this->isFileCacheable() ) {
2129                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2130                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2131                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2132                                 $cache->loadFromFileCache( $this->getContext() );
2133                                 return true;
2134                         } else {
2135                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2136                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2137                         }
2138                 } else {
2139                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2140                 }
2141
2142                 return false;
2143         }
2144
2145         /**
2146          * Check if the page can be cached
2147          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2148          * @return bool
2149          */
2150         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2151                 $cacheable = false;
2152
2153                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2154                         $cacheable = $this->mPage->getId()
2155                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2156                         // Extension may have reason to disable file caching on some pages.
2157                         if ( $cacheable ) {
2158                                 // Avoid PHP 7.1 warning of passing $this by reference
2159                                 $articlePage = $this;
2160                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2161                         }
2162                 }
2163
2164                 return $cacheable;
2165         }
2166
2167         /**#@-*/
2168
2169         /**
2170          * Lightweight method to get the parser output for a page, checking the parser cache
2171          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2172          * consider, so it's not appropriate to use there.
2173          *
2174          * @since 1.16 (r52326) for LiquidThreads
2175          *
2176          * @param int|null $oldid Revision ID or null
2177          * @param User|null $user The relevant user
2178          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2179          */
2180         public function getParserOutput( $oldid = null, User $user = null ) {
2181                 // XXX: bypasses mParserOptions and thus setParserOptions()
2182
2183                 if ( $user === null ) {
2184                         $parserOptions = $this->getParserOptions();
2185                 } else {
2186                         $parserOptions = $this->mPage->makeParserOptions( $user );
2187                 }
2188
2189                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2190         }
2191
2192         /**
2193          * Override the ParserOptions used to render the primary article wikitext.
2194          *
2195          * @param ParserOptions $options
2196          * @throws MWException If the parser options where already initialized.
2197          */
2198         public function setParserOptions( ParserOptions $options ) {
2199                 if ( $this->mParserOptions ) {
2200                         throw new MWException( "can't change parser options after they have already been set" );
2201                 }
2202
2203                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2204                 $this->mParserOptions = clone $options;
2205         }
2206
2207         /**
2208          * Get parser options suitable for rendering the primary article wikitext
2209          * @return ParserOptions
2210          */
2211         public function getParserOptions() {
2212                 if ( !$this->mParserOptions ) {
2213                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2214                 }
2215                 // Clone to allow modifications of the return value without affecting cache
2216                 return clone $this->mParserOptions;
2217         }
2218
2219         /**
2220          * Sets the context this Article is executed in
2221          *
2222          * @param IContextSource $context
2223          * @since 1.18
2224          */
2225         public function setContext( $context ) {
2226                 $this->mContext = $context;
2227         }
2228
2229         /**
2230          * Gets the context this Article is executed in
2231          *
2232          * @return IContextSource
2233          * @since 1.18
2234          */
2235         public function getContext() {
2236                 if ( $this->mContext instanceof IContextSource ) {
2237                         return $this->mContext;
2238                 } else {
2239                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2240                                 "Return RequestContext::getMain(); for sanity\n" );
2241                         return RequestContext::getMain();
2242                 }
2243         }
2244
2245         /**
2246          * Use PHP's magic __get handler to handle accessing of
2247          * raw WikiPage fields for backwards compatibility.
2248          *
2249          * @param string $fname Field name
2250          * @return mixed
2251          */
2252         public function __get( $fname ) {
2253                 if ( property_exists( $this->mPage, $fname ) ) {
2254                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2255                         return $this->mPage->$fname;
2256                 }
2257                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2258         }
2259
2260         /**
2261          * Use PHP's magic __set handler to handle setting of
2262          * raw WikiPage fields for backwards compatibility.
2263          *
2264          * @param string $fname Field name
2265          * @param mixed $fvalue New value
2266          */
2267         public function __set( $fname, $fvalue ) {
2268                 if ( property_exists( $this->mPage, $fname ) ) {
2269                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2270                         $this->mPage->$fname = $fvalue;
2271                 // Note: extensions may want to toss on new fields
2272                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2273                         $this->mPage->$fname = $fvalue;
2274                 } else {
2275                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2276                 }
2277         }
2278
2279         /**
2280          * Call to WikiPage function for backwards compatibility.
2281          * @see WikiPage::checkFlags
2282          */
2283         public function checkFlags( $flags ) {
2284                 return $this->mPage->checkFlags( $flags );
2285         }
2286
2287         /**
2288          * Call to WikiPage function for backwards compatibility.
2289          * @see WikiPage::checkTouched
2290          */
2291         public function checkTouched() {
2292                 return $this->mPage->checkTouched();
2293         }
2294
2295         /**
2296          * Call to WikiPage function for backwards compatibility.
2297          * @see WikiPage::clearPreparedEdit
2298          */
2299         public function clearPreparedEdit() {
2300                 $this->mPage->clearPreparedEdit();
2301         }
2302
2303         /**
2304          * Call to WikiPage function for backwards compatibility.
2305          * @see WikiPage::doDeleteArticleReal
2306          */
2307         public function doDeleteArticleReal(
2308                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2309                 $tags = [], $immediate = false
2310         ) {
2311                 return $this->mPage->doDeleteArticleReal(
2312                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2313                 );
2314         }
2315
2316         /**
2317          * Call to WikiPage function for backwards compatibility.
2318          * @see WikiPage::doDeleteUpdates
2319          */
2320         public function doDeleteUpdates(
2321                 $id,
2322                 Content $content = null,
2323                 $revision = null,
2324                 User $user = null
2325         ) {
2326                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2327         }
2328
2329         /**
2330          * Call to WikiPage function for backwards compatibility.
2331          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2332          * @see WikiPage::doEditContent
2333          */
2334         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2335                 User $user = null, $serialFormat = null
2336         ) {
2337                 wfDeprecated( __METHOD__, '1.29' );
2338                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2339                         $user, $serialFormat
2340                 );
2341         }
2342
2343         /**
2344          * Call to WikiPage function for backwards compatibility.
2345          * @see WikiPage::doEditUpdates
2346          */
2347         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2348                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2349         }
2350
2351         /**
2352          * Call to WikiPage function for backwards compatibility.
2353          * @see WikiPage::doPurge
2354          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2355          *  controlled how much purging was done.
2356          */
2357         public function doPurge() {
2358                 return $this->mPage->doPurge();
2359         }
2360
2361         /**
2362          * Call to WikiPage function for backwards compatibility.
2363          * @see WikiPage::doViewUpdates
2364          */
2365         public function doViewUpdates( User $user, $oldid = 0 ) {
2366                 $this->mPage->doViewUpdates( $user, $oldid );
2367         }
2368
2369         /**
2370          * Call to WikiPage function for backwards compatibility.
2371          * @see WikiPage::exists
2372          */
2373         public function exists() {
2374                 return $this->mPage->exists();
2375         }
2376
2377         /**
2378          * Call to WikiPage function for backwards compatibility.
2379          * @see WikiPage::followRedirect
2380          */
2381         public function followRedirect() {
2382                 return $this->mPage->followRedirect();
2383         }
2384
2385         /**
2386          * Call to WikiPage function for backwards compatibility.
2387          * @see ContentHandler::getActionOverrides
2388          */
2389         public function getActionOverrides() {
2390                 return $this->mPage->getActionOverrides();
2391         }
2392
2393         /**
2394          * Call to WikiPage function for backwards compatibility.
2395          * @see WikiPage::getAutoDeleteReason
2396          */
2397         public function getAutoDeleteReason( &$hasHistory ) {
2398                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2399         }
2400
2401         /**
2402          * Call to WikiPage function for backwards compatibility.
2403          * @see WikiPage::getCategories
2404          */
2405         public function getCategories() {
2406                 return $this->mPage->getCategories();
2407         }
2408
2409         /**
2410          * Call to WikiPage function for backwards compatibility.
2411          * @see WikiPage::getComment
2412          */
2413         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2414                 return $this->mPage->getComment( $audience, $user );
2415         }
2416
2417         /**
2418          * Call to WikiPage function for backwards compatibility.
2419          * @see WikiPage::getContentHandler
2420          */
2421         public function getContentHandler() {
2422                 return $this->mPage->getContentHandler();
2423         }
2424
2425         /**
2426          * Call to WikiPage function for backwards compatibility.
2427          * @see WikiPage::getContentModel
2428          */
2429         public function getContentModel() {
2430                 return $this->mPage->getContentModel();
2431         }
2432
2433         /**
2434          * Call to WikiPage function for backwards compatibility.
2435          * @see WikiPage::getContributors
2436          */
2437         public function getContributors() {
2438                 return $this->mPage->getContributors();
2439         }
2440
2441         /**
2442          * Call to WikiPage function for backwards compatibility.
2443          * @see WikiPage::getCreator
2444          */
2445         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2446                 return $this->mPage->getCreator( $audience, $user );
2447         }
2448
2449         /**
2450          * Call to WikiPage function for backwards compatibility.
2451          * @see WikiPage::getDeletionUpdates
2452          */
2453         public function getDeletionUpdates( Content $content = null ) {
2454                 return $this->mPage->getDeletionUpdates( $content );
2455         }
2456
2457         /**
2458          * Call to WikiPage function for backwards compatibility.
2459          * @see WikiPage::getHiddenCategories
2460          */
2461         public function getHiddenCategories() {
2462                 return $this->mPage->getHiddenCategories();
2463         }
2464
2465         /**
2466          * Call to WikiPage function for backwards compatibility.
2467          * @see WikiPage::getId
2468          */
2469         public function getId() {
2470                 return $this->mPage->getId();
2471         }
2472
2473         /**
2474          * Call to WikiPage function for backwards compatibility.
2475          * @see WikiPage::getLatest
2476          */
2477         public function getLatest() {
2478                 return $this->mPage->getLatest();
2479         }
2480
2481         /**
2482          * Call to WikiPage function for backwards compatibility.
2483          * @see WikiPage::getLinksTimestamp
2484          */
2485         public function getLinksTimestamp() {
2486                 return $this->mPage->getLinksTimestamp();
2487         }
2488
2489         /**
2490          * Call to WikiPage function for backwards compatibility.
2491          * @see WikiPage::getMinorEdit
2492          */
2493         public function getMinorEdit() {
2494                 return $this->mPage->getMinorEdit();
2495         }
2496
2497         /**
2498          * Call to WikiPage function for backwards compatibility.
2499          * @see WikiPage::getOldestRevision
2500          */
2501         public function getOldestRevision() {
2502                 return $this->mPage->getOldestRevision();
2503         }
2504
2505         /**
2506          * Call to WikiPage function for backwards compatibility.
2507          * @see WikiPage::getRedirectTarget
2508          */
2509         public function getRedirectTarget() {
2510                 return $this->mPage->getRedirectTarget();
2511         }
2512
2513         /**
2514          * Call to WikiPage function for backwards compatibility.
2515          * @see WikiPage::getRedirectURL
2516          */
2517         public function getRedirectURL( $rt ) {
2518                 return $this->mPage->getRedirectURL( $rt );
2519         }
2520
2521         /**
2522          * Call to WikiPage function for backwards compatibility.
2523          * @see WikiPage::getRevision
2524          */
2525         public function getRevision() {
2526                 return $this->mPage->getRevision();
2527         }
2528
2529         /**
2530          * Call to WikiPage function for backwards compatibility.
2531          * @see WikiPage::getTimestamp
2532          */
2533         public function getTimestamp() {
2534                 return $this->mPage->getTimestamp();
2535         }
2536
2537         /**
2538          * Call to WikiPage function for backwards compatibility.
2539          * @see WikiPage::getTouched
2540          */
2541         public function getTouched() {
2542                 return $this->mPage->getTouched();
2543         }
2544
2545         /**
2546          * Call to WikiPage function for backwards compatibility.
2547          * @see WikiPage::getUndoContent
2548          */
2549         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2550                 return $this->mPage->getUndoContent( $undo, $undoafter );
2551         }
2552
2553         /**
2554          * Call to WikiPage function for backwards compatibility.
2555          * @see WikiPage::getUser
2556          */
2557         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2558                 return $this->mPage->getUser( $audience, $user );
2559         }
2560
2561         /**
2562          * Call to WikiPage function for backwards compatibility.
2563          * @see WikiPage::getUserText
2564          */
2565         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2566                 return $this->mPage->getUserText( $audience, $user );
2567         }
2568
2569         /**
2570          * Call to WikiPage function for backwards compatibility.
2571          * @see WikiPage::hasViewableContent
2572          */
2573         public function hasViewableContent() {
2574                 return $this->mPage->hasViewableContent();
2575         }
2576
2577         /**
2578          * Call to WikiPage function for backwards compatibility.
2579          * @see WikiPage::insertOn
2580          */
2581         public function insertOn( $dbw, $pageId = null ) {
2582                 return $this->mPage->insertOn( $dbw, $pageId );
2583         }
2584
2585         /**
2586          * Call to WikiPage function for backwards compatibility.
2587          * @see WikiPage::insertProtectNullRevision
2588          */
2589         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2590                 array $expiry, $cascade, $reason, $user = null
2591         ) {
2592                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2593                         $expiry, $cascade, $reason, $user
2594                 );
2595         }
2596
2597         /**
2598          * Call to WikiPage function for backwards compatibility.
2599          * @see WikiPage::insertRedirect
2600          */
2601         public function insertRedirect() {
2602                 return $this->mPage->insertRedirect();
2603         }
2604
2605         /**
2606          * Call to WikiPage function for backwards compatibility.
2607          * @see WikiPage::insertRedirectEntry
2608          */
2609         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2610                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2611         }
2612
2613         /**
2614          * Call to WikiPage function for backwards compatibility.
2615          * @see WikiPage::isCountable
2616          */
2617         public function isCountable( $editInfo = false ) {
2618                 return $this->mPage->isCountable( $editInfo );
2619         }
2620
2621         /**
2622          * Call to WikiPage function for backwards compatibility.
2623          * @see WikiPage::isRedirect
2624          */
2625         public function isRedirect() {
2626                 return $this->mPage->isRedirect();
2627         }
2628
2629         /**
2630          * Call to WikiPage function for backwards compatibility.
2631          * @see WikiPage::loadFromRow
2632          */
2633         public function loadFromRow( $data, $from ) {
2634                 return $this->mPage->loadFromRow( $data, $from );
2635         }
2636
2637         /**
2638          * Call to WikiPage function for backwards compatibility.
2639          * @see WikiPage::loadPageData
2640          */
2641         public function loadPageData( $from = 'fromdb' ) {
2642                 $this->mPage->loadPageData( $from );
2643         }
2644
2645         /**
2646          * Call to WikiPage function for backwards compatibility.
2647          * @see WikiPage::lockAndGetLatest
2648          */
2649         public function lockAndGetLatest() {
2650                 return $this->mPage->lockAndGetLatest();
2651         }
2652
2653         /**
2654          * Call to WikiPage function for backwards compatibility.
2655          * @see WikiPage::makeParserOptions
2656          */
2657         public function makeParserOptions( $context ) {
2658                 return $this->mPage->makeParserOptions( $context );
2659         }
2660
2661         /**
2662          * Call to WikiPage function for backwards compatibility.
2663          * @see WikiPage::pageDataFromId
2664          */
2665         public function pageDataFromId( $dbr, $id, $options = [] ) {
2666                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2667         }
2668
2669         /**
2670          * Call to WikiPage function for backwards compatibility.
2671          * @see WikiPage::pageDataFromTitle
2672          */
2673         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2674                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2675         }
2676
2677         /**
2678          * Call to WikiPage function for backwards compatibility.
2679          * @see WikiPage::prepareContentForEdit
2680          */
2681         public function prepareContentForEdit(
2682                 Content $content, $revision = null, User $user = null,
2683                 $serialFormat = null, $useCache = true
2684         ) {
2685                 return $this->mPage->prepareContentForEdit(
2686                         $content, $revision, $user,
2687                         $serialFormat, $useCache
2688                 );
2689         }
2690
2691         /**
2692          * Call to WikiPage function for backwards compatibility.
2693          * @see WikiPage::protectDescription
2694          */
2695         public function protectDescription( array $limit, array $expiry ) {
2696                 return $this->mPage->protectDescription( $limit, $expiry );
2697         }
2698
2699         /**
2700          * Call to WikiPage function for backwards compatibility.
2701          * @see WikiPage::protectDescriptionLog
2702          */
2703         public function protectDescriptionLog( array $limit, array $expiry ) {
2704                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2705         }
2706
2707         /**
2708          * Call to WikiPage function for backwards compatibility.
2709          * @see WikiPage::replaceSectionAtRev
2710          */
2711         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2712                 $sectionTitle = '', $baseRevId = null
2713         ) {
2714                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2715                         $sectionTitle, $baseRevId
2716                 );
2717         }
2718
2719         /**
2720          * Call to WikiPage function for backwards compatibility.
2721          * @see WikiPage::replaceSectionContent
2722          */
2723         public function replaceSectionContent(
2724                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2725         ) {
2726                 return $this->mPage->replaceSectionContent(
2727                         $sectionId, $sectionContent, $sectionTitle, $edittime
2728                 );
2729         }
2730
2731         /**
2732          * Call to WikiPage function for backwards compatibility.
2733          * @see WikiPage::setTimestamp
2734          */
2735         public function setTimestamp( $ts ) {
2736                 return $this->mPage->setTimestamp( $ts );
2737         }
2738
2739         /**
2740          * Call to WikiPage function for backwards compatibility.
2741          * @see WikiPage::shouldCheckParserCache
2742          */
2743         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2744                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2745         }
2746
2747         /**
2748          * Call to WikiPage function for backwards compatibility.
2749          * @see WikiPage::supportsSections
2750          */
2751         public function supportsSections() {
2752                 return $this->mPage->supportsSections();
2753         }
2754
2755         /**
2756          * Call to WikiPage function for backwards compatibility.
2757          * @see WikiPage::triggerOpportunisticLinksUpdate
2758          */
2759         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2760                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2761         }
2762
2763         /**
2764          * Call to WikiPage function for backwards compatibility.
2765          * @see WikiPage::updateCategoryCounts
2766          */
2767         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2768                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2769         }
2770
2771         /**
2772          * Call to WikiPage function for backwards compatibility.
2773          * @see WikiPage::updateIfNewerOn
2774          */
2775         public function updateIfNewerOn( $dbw, $revision ) {
2776                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2777         }
2778
2779         /**
2780          * Call to WikiPage function for backwards compatibility.
2781          * @see WikiPage::updateRedirectOn
2782          */
2783         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2784                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2785         }
2786
2787         /**
2788          * Call to WikiPage function for backwards compatibility.
2789          * @see WikiPage::updateRevisionOn
2790          */
2791         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2792                 $lastRevIsRedirect = null
2793         ) {
2794                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2795                         $lastRevIsRedirect
2796                 );
2797         }
2798
2799         /**
2800          * @param array $limit
2801          * @param array $expiry
2802          * @param bool &$cascade
2803          * @param string $reason
2804          * @param User $user
2805          * @return Status
2806          */
2807         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2808                 $reason, User $user
2809         ) {
2810                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2811         }
2812
2813         /**
2814          * @param array $limit
2815          * @param string $reason
2816          * @param int &$cascade
2817          * @param array $expiry
2818          * @return bool
2819          */
2820         public function updateRestrictions( $limit = [], $reason = '',
2821                 &$cascade = 0, $expiry = []
2822         ) {
2823                 return $this->mPage->doUpdateRestrictions(
2824                         $limit,
2825                         $expiry,
2826                         $cascade,
2827                         $reason,
2828                         $this->getContext()->getUser()
2829                 );
2830         }
2831
2832         /**
2833          * @param string $reason
2834          * @param bool $suppress
2835          * @param int|null $u1 Unused
2836          * @param bool|null $u2 Unused
2837          * @param string &$error
2838          * @param bool $immediate false allows deleting over time via the job queue
2839          * @return bool
2840          * @throws FatalError
2841          * @throws MWException
2842          */
2843         public function doDeleteArticle(
2844                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2845         ) {
2846                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2847                         null, $immediate );
2848         }
2849
2850         /**
2851          * @param string $fromP
2852          * @param string $summary
2853          * @param string $token
2854          * @param bool $bot
2855          * @param array &$resultDetails
2856          * @param User|null $user
2857          * @return array
2858          */
2859         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2860                 if ( !$user ) {
2861                         $user = $this->getContext()->getUser();
2862                 }
2863
2864                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2865         }
2866
2867         /**
2868          * @param string $fromP
2869          * @param string $summary
2870          * @param bool $bot
2871          * @param array &$resultDetails
2872          * @param User|null $guser
2873          * @return array
2874          */
2875         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2876                 if ( !$guser ) {
2877                         $guser = $this->getContext()->getUser();
2878                 }
2879
2880                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2881         }
2882
2883         /**
2884          * @param bool &$hasHistory
2885          * @return mixed
2886          */
2887         public function generateReason( &$hasHistory ) {
2888                 $title = $this->mPage->getTitle();
2889                 $handler = ContentHandler::getForTitle( $title );
2890                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2891         }
2892
2893         // ******
2894 }