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\Storage\MutableRevisionRecord;
  24 use MediaWiki\Storage\RevisionRecord;
  25
  26 /**
  27  * Class for viewing MediaWiki article and history.
  28  *
  29  * This maintains WikiPage functions for backwards compatibility.
  30  *
  31  * @todo Move and rewrite code to an Action class
  32  *
  33  * See design.txt for an overview.
  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         private $disableSectionEditForRender = 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, 'parsemag' );
 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( '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 ( $this->disableSectionEditForRender
 636                         || !$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                                                 );
 771                                                 $ok = $poolArticleView->execute();
 772                                                 $error = $poolArticleView->getError();
 773                                                 $this->mParserOutput = $poolArticleView->getParserOutput() ?: null;
 774
 775                                                 # Don't cache a dirty ParserOutput object
 776                                                 if ( $poolArticleView->getIsDirty() ) {
 777                                                         $outputPage->setCdnMaxage( 0 );
 778                                                         $outputPage->addHTML( "<!-- parser cache is expired, " .
 779                                                                 "sending anyway due to pool overload-->\n" );
 780                                                 }
 781                                         } else {
 782                                                 $ok = false;
 783                                         }
 784
 785                                         if ( !$ok ) {
 786                                                 if ( $error ) {
 787                                                         $outputPage->clearHTML(); // for release() errors
 788                                                         $outputPage->enableClientCache( false );
 789                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 790
 791                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 792                                                         $outputPage->addWikiText( Html::errorBox( $errortext ) );
 793                                                 }
 794                                                 # Connection or timeout error
 795                                                 return;
 796                                         }
 797
 798                                         if ( $this->mParserOutput ) {
 799                                                 $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 800                                         }
 801
 802                                         if ( $rev && $this->getRevisionRedirectTarget( $rev ) ) {
 803                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 804                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 805                                         }
 806
 807                                         $outputDone = true;
 808                                         break;
 809                                 # Should be unreachable, but just in case...
 810                                 default:
 811                                         break 2;
 812                         }
 813                 }
 814
 815                 // Get the ParserOutput actually *displayed* here.
 816                 // Note that $this->mParserOutput is the *current*/oldid version output.
 817                 // Note that the ArticleViewHeader hook is allowed to set $outputDone to a
 818                 // ParserOutput instance.
 819                 $pOutput = ( $outputDone instanceof ParserOutput )
 820                         ? $outputDone // object fetched by hook
 821                         : $this->mParserOutput ?: null; // ParserOutput or null, avoid false
 822
 823                 # Adjust title for main page & pages with displaytitle
 824                 if ( $pOutput ) {
 825                         $this->adjustDisplayTitle( $pOutput );
 826                 }
 827
 828                 # For the main page, overwrite the <title> element with the con-
 829                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 830                 # that's not empty).
 831                 # This message always exists because it is in the i18n files
 832                 if ( $this->getTitle()->isMainPage() ) {
 833                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 834                         if ( !$msg->isDisabled() ) {
 835                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 836                         }
 837                 }
 838
 839                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 840                 # This could use getTouched(), but that could be scary for major template edits.
 841                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 842
 843                 # Check for any __NOINDEX__ tags on the page using $pOutput
 844                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 845                 $outputPage->setIndexPolicy( $policy['index'] );
 846                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 847
 848                 $this->showViewFooter();
 849                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 850
 851                 # Load the postEdit module if the user just saved this revision
 852                 # See also EditPage::setPostEditCookie
 853                 $request = $this->getContext()->getRequest();
 854                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 855                 $postEdit = $request->getCookie( $cookieKey );
 856                 if ( $postEdit ) {
 857                         # Clear the cookie. This also prevents caching of the response.
 858                         $request->response()->clearCookie( $cookieKey );
 859                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 860                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 861                 }
 862         }
 863
 864         /**
 865          * @param RevisionRecord $revision
 866          * @return null|Title
 867          */
 868         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 869                 // TODO: find a *good* place for the code that determines the redirect target for
 870                 // a given revision!
 871                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 872                 $content = $revision->getContent( 'main' );
 873                 return $content ? $content->getRedirectTarget() : null;
 874         }
 875
 876         /**
 877          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 878          * @param ParserOutput $pOutput
 879          */
 880         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 881                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 882                 $titleText = $pOutput->getTitleText();
 883                 if ( strval( $titleText ) !== '' ) {
 884                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 885                 }
 886         }
 887
 888         /**
 889          * Show a diff page according to current request variables. For use within
 890          * Article::view() only, other callers should use the DifferenceEngine class.
 891          */
 892         protected function showDiffPage() {
 893                 $request = $this->getContext()->getRequest();
 894                 $user = $this->getContext()->getUser();
 895                 $diff = $request->getVal( 'diff' );
 896                 $rcid = $request->getVal( 'rcid' );
 897                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 898                 $purge = $request->getVal( 'action' ) == 'purge';
 899                 $unhide = $request->getInt( 'unhide' ) == 1;
 900                 $oldid = $this->getOldID();
 901
 902                 $rev = $this->getRevisionFetched();
 903
 904                 if ( !$rev ) {
 905                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 906                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 907                                 ->params( $oldid )
 908                                 ->numParams( 1 )
 909                                 ->parseAsBlock();
 910                         $this->getContext()->getOutput()->addHTML( $msg );
 911                         return;
 912                 }
 913
 914                 $contentHandler = $rev->getContentHandler();
 915                 $de = $contentHandler->createDifferenceEngine(
 916                         $this->getContext(),
 917                         $oldid,
 918                         $diff,
 919                         $rcid,
 920                         $purge,
 921                         $unhide
 922                 );
 923
 924                 // DifferenceEngine directly fetched the revision:
 925                 $this->mRevIdFetched = $de->getNewid();
 926                 $de->showDiffPage( $diffOnly );
 927
 928                 // Run view updates for the newer revision being diffed (and shown
 929                 // below the diff if not $diffOnly).
 930                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 931                 // New can be false, convert it to 0 - this conveniently means the latest revision
 932                 $this->mPage->doViewUpdates( $user, (int)$new );
 933         }
 934
 935         /**
 936          * Get the robot policy to be used for the current view
 937          * @param string $action The action= GET parameter
 938          * @param ParserOutput|null $pOutput
 939          * @return array The policy that should be set
 940          * @todo actions other than 'view'
 941          */
 942         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 943                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 944
 945                 $ns = $this->getTitle()->getNamespace();
 946
 947                 # Don't index user and user talk pages for blocked users (T13443)
 948                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 949                         $specificTarget = null;
 950                         $vagueTarget = null;
 951                         $titleText = $this->getTitle()->getText();
 952                         if ( IP::isValid( $titleText ) ) {
 953                                 $vagueTarget = $titleText;
 954                         } else {
 955                                 $specificTarget = $titleText;
 956                         }
 957                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 958                                 return [
 959                                         'index' => 'noindex',
 960                                         'follow' => 'nofollow'
 961                                 ];
 962                         }
 963                 }
 964
 965                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 966                         # Non-articles (special pages etc), and old revisions
 967                         return [
 968                                 'index' => 'noindex',
 969                                 'follow' => 'nofollow'
 970                         ];
 971                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 972                         # Discourage indexing of printable versions, but encourage following
 973                         return [
 974                                 'index' => 'noindex',
 975                                 'follow' => 'follow'
 976                         ];
 977                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 978                         # For ?curid=x urls, disallow indexing
 979                         return [
 980                                 'index' => 'noindex',
 981                                 'follow' => 'follow'
 982                         ];
 983                 }
 984
 985                 # Otherwise, construct the policy based on the various config variables.
 986                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 987
 988                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 989                         # Honour customised robot policies for this namespace
 990                         $policy = array_merge(
 991                                 $policy,
 992                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 993                         );
 994                 }
 995                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 996                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 997                         # a final sanity check that we have really got the parser output.
 998                         $policy = array_merge(
 999                                 $policy,
1000                                 [ 'index' => $pOutput->getIndexPolicy() ]
1001                         );
1002                 }
1003
1004                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1005                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1006                         $policy = array_merge(
1007                                 $policy,
1008                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1009                         );
1010                 }
1011
1012                 return $policy;
1013         }
1014
1015         /**
1016          * Converts a String robot policy into an associative array, to allow
1017          * merging of several policies using array_merge().
1018          * @param array|string $policy Returns empty array on null/false/'', transparent
1019          *   to already-converted arrays, converts string.
1020          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1021          */
1022         public static function formatRobotPolicy( $policy ) {
1023                 if ( is_array( $policy ) ) {
1024                         return $policy;
1025                 } elseif ( !$policy ) {
1026                         return [];
1027                 }
1028
1029                 $policy = explode( ',', $policy );
1030                 $policy = array_map( 'trim', $policy );
1031
1032                 $arr = [];
1033                 foreach ( $policy as $var ) {
1034                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1035                                 $arr['index'] = $var;
1036                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1037                                 $arr['follow'] = $var;
1038                         }
1039                 }
1040
1041                 return $arr;
1042         }
1043
1044         /**
1045          * If this request is a redirect view, send "redirected from" subtitle to
1046          * the output. Returns true if the header was needed, false if this is not
1047          * a redirect view. Handles both local and remote redirects.
1048          *
1049          * @return bool
1050          */
1051         public function showRedirectedFromHeader() {
1052                 global $wgRedirectSources;
1053
1054                 $context = $this->getContext();
1055                 $outputPage = $context->getOutput();
1056                 $request = $context->getRequest();
1057                 $rdfrom = $request->getVal( 'rdfrom' );
1058
1059                 // Construct a URL for the current page view, but with the target title
1060                 $query = $request->getValues();
1061                 unset( $query['rdfrom'] );
1062                 unset( $query['title'] );
1063                 if ( $this->getTitle()->isRedirect() ) {
1064                         // Prevent double redirects
1065                         $query['redirect'] = 'no';
1066                 }
1067                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1068
1069                 if ( isset( $this->mRedirectedFrom ) ) {
1070                         // Avoid PHP 7.1 warning of passing $this by reference
1071                         $articlePage = $this;
1072
1073                         // This is an internally redirected page view.
1074                         // We'll need a backlink to the source page for navigation.
1075                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1076                                 $redir = Linker::linkKnown(
1077                                         $this->mRedirectedFrom,
1078                                         null,
1079                                         [],
1080                                         [ 'redirect' => 'no' ]
1081                                 );
1082
1083                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1084                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1085                                 . "</span>" );
1086
1087                                 // Add the script to update the displayed URL and
1088                                 // set the fragment if one was specified in the redirect
1089                                 $outputPage->addJsConfigVars( [
1090                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1091                                 ] );
1092                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1093
1094                                 // Add a <link rel="canonical"> tag
1095                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1096
1097                                 // Tell the output object that the user arrived at this article through a redirect
1098                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1099
1100                                 return true;
1101                         }
1102                 } elseif ( $rdfrom ) {
1103                         // This is an externally redirected view, from some other wiki.
1104                         // If it was reported from a trusted site, supply a backlink.
1105                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1106                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1107                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1108                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1109                                 . "</span>" );
1110
1111                                 // Add the script to update the displayed URL
1112                                 $outputPage->addJsConfigVars( [
1113                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1114                                 ] );
1115                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1116
1117                                 return true;
1118                         }
1119                 }
1120
1121                 return false;
1122         }
1123
1124         /**
1125          * Show a header specific to the namespace currently being viewed, like
1126          * [[MediaWiki:Talkpagetext]]. For Article::view().
1127          */
1128         public function showNamespaceHeader() {
1129                 if ( $this->getTitle()->isTalkPage() ) {
1130                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1131                                 $this->getContext()->getOutput()->wrapWikiMsg(
1132                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1133                                         [ 'talkpageheader' ]
1134                                 );
1135                         }
1136                 }
1137         }
1138
1139         /**
1140          * Show the footer section of an ordinary page view
1141          */
1142         public function showViewFooter() {
1143                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1144                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1145                         && IP::isValid( $this->getTitle()->getText() )
1146                 ) {
1147                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1148                 }
1149
1150                 // Show a footer allowing the user to patrol the shown revision or page if possible
1151                 $patrolFooterShown = $this->showPatrolFooter();
1152
1153                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1154         }
1155
1156         /**
1157          * If patrol is possible, output a patrol UI box. This is called from the
1158          * footer section of ordinary page views. If patrol is not possible or not
1159          * desired, does nothing.
1160          * Side effect: When the patrol link is build, this method will call
1161          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1162          *
1163          * @return bool
1164          */
1165         public function showPatrolFooter() {
1166                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1167
1168                 // Allow hooks to decide whether to not output this at all
1169                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1170                         return false;
1171                 }
1172
1173                 $outputPage = $this->getContext()->getOutput();
1174                 $user = $this->getContext()->getUser();
1175                 $title = $this->getTitle();
1176                 $rc = false;
1177
1178                 if ( !$title->quickUserCan( 'patrol', $user )
1179                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1180                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1181                 ) {
1182                         // Patrolling is disabled or the user isn't allowed to
1183                         return false;
1184                 }
1185
1186                 if ( $this->mRevision
1187                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1188                 ) {
1189                         // The current revision is already older than what could be in the RC table
1190                         // 6h tolerance because the RC might not be cleaned out regularly
1191                         return false;
1192                 }
1193
1194                 // Check for cached results
1195                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1196                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1197                 if ( $cache->get( $key ) ) {
1198                         return false;
1199                 }
1200
1201                 $dbr = wfGetDB( DB_REPLICA );
1202                 $oldestRevisionTimestamp = $dbr->selectField(
1203                         'revision',
1204                         'MIN( rev_timestamp )',
1205                         [ 'rev_page' => $title->getArticleID() ],
1206                         __METHOD__
1207                 );
1208
1209                 // New page patrol: Get the timestamp of the oldest revison which
1210                 // the revision table holds for the given page. Then we look
1211                 // whether it's within the RC lifespan and if it is, we try
1212                 // to get the recentchanges row belonging to that entry
1213                 // (with rc_new = 1).
1214                 $recentPageCreation = false;
1215                 if ( $oldestRevisionTimestamp
1216                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1217                 ) {
1218                         // 6h tolerance because the RC might not be cleaned out regularly
1219                         $recentPageCreation = true;
1220                         $rc = RecentChange::newFromConds(
1221                                 [
1222                                         'rc_new' => 1,
1223                                         'rc_timestamp' => $oldestRevisionTimestamp,
1224                                         'rc_namespace' => $title->getNamespace(),
1225                                         'rc_cur_id' => $title->getArticleID()
1226                                 ],
1227                                 __METHOD__
1228                         );
1229                         if ( $rc ) {
1230                                 // Use generic patrol message for new pages
1231                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1232                         }
1233                 }
1234
1235                 // File patrol: Get the timestamp of the latest upload for this page,
1236                 // check whether it is within the RC lifespan and if it is, we try
1237                 // to get the recentchanges row belonging to that entry
1238                 // (with rc_type = RC_LOG, rc_log_type = upload).
1239                 $recentFileUpload = false;
1240                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1241                         && $title->getNamespace() === NS_FILE ) {
1242                         // Retrieve timestamp of most recent upload
1243                         $newestUploadTimestamp = $dbr->selectField(
1244                                 'image',
1245                                 'MAX( img_timestamp )',
1246                                 [ 'img_name' => $title->getDBkey() ],
1247                                 __METHOD__
1248                         );
1249                         if ( $newestUploadTimestamp
1250                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1251                         ) {
1252                                 // 6h tolerance because the RC might not be cleaned out regularly
1253                                 $recentFileUpload = true;
1254                                 $rc = RecentChange::newFromConds(
1255                                         [
1256                                                 'rc_type' => RC_LOG,
1257                                                 'rc_log_type' => 'upload',
1258                                                 'rc_timestamp' => $newestUploadTimestamp,
1259                                                 'rc_namespace' => NS_FILE,
1260                                                 'rc_cur_id' => $title->getArticleID()
1261                                         ],
1262                                         __METHOD__
1263                                 );
1264                                 if ( $rc ) {
1265                                         // Use patrol message specific to files
1266                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1267                                 }
1268                         }
1269                 }
1270
1271                 if ( !$recentPageCreation && !$recentFileUpload ) {
1272                         // Page creation and latest upload (for files) is too old to be in RC
1273
1274                         // We definitely can't patrol so cache the information
1275                         // When a new file version is uploaded, the cache is cleared
1276                         $cache->set( $key, '1' );
1277
1278                         return false;
1279                 }
1280
1281                 if ( !$rc ) {
1282                         // Don't cache: This can be hit if the page gets accessed very fast after
1283                         // its creation / latest upload or in case we have high replica DB lag. In case
1284                         // the revision is too old, we will already return above.
1285                         return false;
1286                 }
1287
1288                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1289                         // Patrolled RC entry around
1290
1291                         // Cache the information we gathered above in case we can't patrol
1292                         // Don't cache in case we can patrol as this could change
1293                         $cache->set( $key, '1' );
1294
1295                         return false;
1296                 }
1297
1298                 if ( $rc->getPerformer()->equals( $user ) ) {
1299                         // Don't show a patrol link for own creations/uploads. If the user could
1300                         // patrol them, they already would be patrolled
1301                         return false;
1302                 }
1303
1304                 $outputPage->preventClickjacking();
1305                 if ( $user->isAllowed( 'writeapi' ) ) {
1306                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1307                 }
1308
1309                 $link = Linker::linkKnown(
1310                         $title,
1311                         $markPatrolledMsg->escaped(),
1312                         [],
1313                         [
1314                                 'action' => 'markpatrolled',
1315                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1316                         ]
1317                 );
1318
1319                 $outputPage->addHTML(
1320                         "<div class='patrollink' data-mw='interface'>" .
1321                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1322                         '</div>'
1323                 );
1324
1325                 return true;
1326         }
1327
1328         /**
1329          * Purge the cache used to check if it is worth showing the patrol footer
1330          * For example, it is done during re-uploads when file patrol is used.
1331          * @param int $articleID ID of the article to purge
1332          * @since 1.27
1333          */
1334         public static function purgePatrolFooterCache( $articleID ) {
1335                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1336                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1337         }
1338
1339         /**
1340          * Show the error text for a missing article. For articles in the MediaWiki
1341          * namespace, show the default message text. To be called from Article::view().
1342          */
1343         public function showMissingArticle() {
1344                 global $wgSend404Code;
1345
1346                 $outputPage = $this->getContext()->getOutput();
1347                 // Whether the page is a root user page of an existing user (but not a subpage)
1348                 $validUserPage = false;
1349
1350                 $title = $this->getTitle();
1351
1352                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1353                 if ( $title->getNamespace() == NS_USER
1354                         || $title->getNamespace() == NS_USER_TALK
1355                 ) {
1356                         $rootPart = explode( '/', $title->getText() )[0];
1357                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1358                         $ip = User::isIP( $rootPart );
1359                         $block = Block::newFromTarget( $user, $user );
1360
1361                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1362                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1363                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1364                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1365                                 # Show log extract if the user is currently blocked
1366                                 LogEventsList::showLogExtract(
1367                                         $outputPage,
1368                                         'block',
1369                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1370                                         '',
1371                                         [
1372                                                 'lim' => 1,
1373                                                 'showIfEmpty' => false,
1374                                                 'msgKey' => [
1375                                                         'blocked-notice-logextract',
1376                                                         $user->getName() # Support GENDER in notice
1377                                                 ]
1378                                         ]
1379                                 );
1380                                 $validUserPage = !$title->isSubpage();
1381                         } else {
1382                                 $validUserPage = !$title->isSubpage();
1383                         }
1384                 }
1385
1386                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1387
1388                 # Show delete and move logs if there were any such events.
1389                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1390                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1391                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
1392                 $key = $cache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1393                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1394                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1395                 if ( $loggedIn || $cache->get( $key ) || $sessionExists ) {
1396                         $logTypes = [ 'delete', 'move', 'protect' ];
1397
1398                         $dbr = wfGetDB( DB_REPLICA );
1399
1400                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1401                         // Give extensions a chance to hide their (unrelated) log entries
1402                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1403                         LogEventsList::showLogExtract(
1404                                 $outputPage,
1405                                 $logTypes,
1406                                 $title,
1407                                 '',
1408                                 [
1409                                         'lim' => 10,
1410                                         'conds' => $conds,
1411                                         'showIfEmpty' => false,
1412                                         'msgKey' => [ $loggedIn || $sessionExists
1413                                                 ? 'moveddeleted-notice'
1414                                                 : 'moveddeleted-notice-recent'
1415                                         ]
1416                                 ]
1417                         );
1418                 }
1419
1420                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1421                         // If there's no backing content, send a 404 Not Found
1422                         // for better machine handling of broken links.
1423                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1424                 }
1425
1426                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1427                 $policy = $this->getRobotPolicy( 'view' );
1428                 $outputPage->setIndexPolicy( $policy['index'] );
1429                 $outputPage->setFollowPolicy( $policy['follow'] );
1430
1431                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1432
1433                 if ( !$hookResult ) {
1434                         return;
1435                 }
1436
1437                 # Show error message
1438                 $oldid = $this->getOldID();
1439                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1440                         // use fake Content object for system message
1441                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1442                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1443                 } else {
1444                         if ( $oldid ) {
1445                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1446                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1447                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1448                         ) {
1449                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1450                                 $text = wfMessage( $message )->plain();
1451                         } else {
1452                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1453                         }
1454
1455                         $dir = $this->getContext()->getLanguage()->getDir();
1456                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1457                         $outputPage->addWikiText( Xml::openElement( 'div', [
1458                                 'class' => "noarticletext mw-content-$dir",
1459                                 'dir' => $dir,
1460                                 'lang' => $lang,
1461                         ] ) . "\n$text\n</div>" );
1462                 }
1463         }
1464
1465         /**
1466          * If the revision requested for view is deleted, check permissions.
1467          * Send either an error message or a warning header to the output.
1468          *
1469          * @return bool True if the view is allowed, false if not.
1470          */
1471         public function showDeletedRevisionHeader() {
1472                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1473                         // Not deleted
1474                         return true;
1475                 }
1476
1477                 $outputPage = $this->getContext()->getOutput();
1478                 $user = $this->getContext()->getUser();
1479                 // If the user is not allowed to see it...
1480                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1481                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1482                                 'rev-deleted-text-permission' );
1483
1484                         return false;
1485                 // If the user needs to confirm that they want to see it...
1486                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1487                         # Give explanation and add a link to view the revision...
1488                         $oldid = intval( $this->getOldID() );
1489                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1490                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1491                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1492                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1493                                 [ $msg, $link ] );
1494
1495                         return false;
1496                 // We are allowed to see...
1497                 } else {
1498                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1499                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1500                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1501
1502                         return true;
1503                 }
1504         }
1505
1506         /**
1507          * Generate the navigation links when browsing through an article revisions
1508          * It shows the information as:
1509          *   Revision as of \<date\>; view current revision
1510          *   \<- Previous version | Next Version -\>
1511          *
1512          * @param int $oldid Revision ID of this article revision
1513          */
1514         public function setOldSubtitle( $oldid = 0 ) {
1515                 // Avoid PHP 7.1 warning of passing $this by reference
1516                 $articlePage = $this;
1517
1518                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1519                         return;
1520                 }
1521
1522                 $context = $this->getContext();
1523                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1524
1525                 # Cascade unhide param in links for easy deletion browsing
1526                 $extraParams = [];
1527                 if ( $unhide ) {
1528                         $extraParams['unhide'] = 1;
1529                 }
1530
1531                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1532                         $revision = $this->mRevision;
1533                 } else {
1534                         $revision = Revision::newFromId( $oldid );
1535                 }
1536
1537                 $timestamp = $revision->getTimestamp();
1538
1539                 $current = ( $oldid == $this->mPage->getLatest() );
1540                 $language = $context->getLanguage();
1541                 $user = $context->getUser();
1542
1543                 $td = $language->userTimeAndDate( $timestamp, $user );
1544                 $tddate = $language->userDate( $timestamp, $user );
1545                 $tdtime = $language->userTime( $timestamp, $user );
1546
1547                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1548                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1549
1550                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1551                         ? 'revision-info-current'
1552                         : 'revision-info';
1553
1554                 $outputPage = $context->getOutput();
1555                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1556                         $context->msg( $infomsg, $td )
1557                                 ->rawParams( $userlinks )
1558                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1559                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1560                                 ->parse() .
1561                         "</div>";
1562
1563                 $lnk = $current
1564                         ? $context->msg( 'currentrevisionlink' )->escaped()
1565                         : Linker::linkKnown(
1566                                 $this->getTitle(),
1567                                 $context->msg( 'currentrevisionlink' )->escaped(),
1568                                 [],
1569                                 $extraParams
1570                         );
1571                 $curdiff = $current
1572                         ? $context->msg( 'diff' )->escaped()
1573                         : Linker::linkKnown(
1574                                 $this->getTitle(),
1575                                 $context->msg( 'diff' )->escaped(),
1576                                 [],
1577                                 [
1578                                         'diff' => 'cur',
1579                                         'oldid' => $oldid
1580                                 ] + $extraParams
1581                         );
1582                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1583                 $prevlink = $prev
1584                         ? Linker::linkKnown(
1585                                 $this->getTitle(),
1586                                 $context->msg( 'previousrevision' )->escaped(),
1587                                 [],
1588                                 [
1589                                         'direction' => 'prev',
1590                                         'oldid' => $oldid
1591                                 ] + $extraParams
1592                         )
1593                         : $context->msg( 'previousrevision' )->escaped();
1594                 $prevdiff = $prev
1595                         ? Linker::linkKnown(
1596                                 $this->getTitle(),
1597                                 $context->msg( 'diff' )->escaped(),
1598                                 [],
1599                                 [
1600                                         'diff' => 'prev',
1601                                         'oldid' => $oldid
1602                                 ] + $extraParams
1603                         )
1604                         : $context->msg( 'diff' )->escaped();
1605                 $nextlink = $current
1606                         ? $context->msg( 'nextrevision' )->escaped()
1607                         : Linker::linkKnown(
1608                                 $this->getTitle(),
1609                                 $context->msg( 'nextrevision' )->escaped(),
1610                                 [],
1611                                 [
1612                                         'direction' => 'next',
1613                                         'oldid' => $oldid
1614                                 ] + $extraParams
1615                         );
1616                 $nextdiff = $current
1617                         ? $context->msg( 'diff' )->escaped()
1618                         : Linker::linkKnown(
1619                                 $this->getTitle(),
1620                                 $context->msg( 'diff' )->escaped(),
1621                                 [],
1622                                 [
1623                                         'diff' => 'next',
1624                                         'oldid' => $oldid
1625                                 ] + $extraParams
1626                         );
1627
1628                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1629                 if ( $cdel !== '' ) {
1630                         $cdel .= ' ';
1631                 }
1632
1633                 // the outer div is need for styling the revision info and nav in MobileFrontend
1634                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1635                         "<div id=\"mw-revision-nav\">" . $cdel .
1636                         $context->msg( 'revision-nav' )->rawParams(
1637                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1638                         )->escaped() . "</div></div>" );
1639         }
1640
1641         /**
1642          * Return the HTML for the top of a redirect page
1643          *
1644          * Chances are you should just be using the ParserOutput from
1645          * WikitextContent::getParserOutput instead of calling this for redirects.
1646          *
1647          * @param Title|array $target Destination(s) to redirect
1648          * @param bool $appendSubtitle [optional]
1649          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1650          * @return string Containing HTML with redirect link
1651          *
1652          * @deprecated since 1.30
1653          */
1654         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1655                 $lang = $this->getTitle()->getPageLanguage();
1656                 $out = $this->getContext()->getOutput();
1657                 if ( $appendSubtitle ) {
1658                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1659                 }
1660                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1661                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1662         }
1663
1664         /**
1665          * Return the HTML for the top of a redirect page
1666          *
1667          * Chances are you should just be using the ParserOutput from
1668          * WikitextContent::getParserOutput instead of calling this for redirects.
1669          *
1670          * @since 1.23
1671          * @param Language $lang
1672          * @param Title|array $target Destination(s) to redirect
1673          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1674          * @return string Containing HTML with redirect link
1675          */
1676         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1677                 if ( !is_array( $target ) ) {
1678                         $target = [ $target ];
1679                 }
1680
1681                 $html = '<ul class="redirectText">';
1682                 /** @var Title $title */
1683                 foreach ( $target as $title ) {
1684                         $html .= '<li>' . Linker::link(
1685                                 $title,
1686                                 htmlspecialchars( $title->getFullText() ),
1687                                 [],
1688                                 // Make sure wiki page redirects are not followed
1689                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1690                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1691                         ) . '</li>';
1692                 }
1693                 $html .= '</ul>';
1694
1695                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1696
1697                 return '<div class="redirectMsg">' .
1698                         '<p>' . $redirectToText . '</p>' .
1699                         $html .
1700                         '</div>';
1701         }
1702
1703         /**
1704          * Adds help link with an icon via page indicators.
1705          * Link target can be overridden by a local message containing a wikilink:
1706          * the message key is: 'namespace-' + namespace number + '-helppage'.
1707          * @param string $to Target MediaWiki.org page title or encoded URL.
1708          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1709          * @since 1.25
1710          */
1711         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1712                 $msg = wfMessage(
1713                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1714                 );
1715
1716                 $out = $this->getContext()->getOutput();
1717                 if ( !$msg->isDisabled() ) {
1718                         $helpUrl = Skin::makeUrl( $msg->plain() );
1719                         $out->addHelpLink( $helpUrl, true );
1720                 } else {
1721                         $out->addHelpLink( $to, $overrideBaseUrl );
1722                 }
1723         }
1724
1725         /**
1726          * Handle action=render
1727          */
1728         public function render() {
1729                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1730                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1731                 $this->disableSectionEditForRender = true;
1732                 $this->view();
1733         }
1734
1735         /**
1736          * action=protect handler
1737          */
1738         public function protect() {
1739                 $form = new ProtectionForm( $this );
1740                 $form->execute();
1741         }
1742
1743         /**
1744          * action=unprotect handler (alias)
1745          */
1746         public function unprotect() {
1747                 $this->protect();
1748         }
1749
1750         /**
1751          * UI entry point for page deletion
1752          */
1753         public function delete() {
1754                 # This code desperately needs to be totally rewritten
1755
1756                 $title = $this->getTitle();
1757                 $context = $this->getContext();
1758                 $user = $context->getUser();
1759                 $request = $context->getRequest();
1760
1761                 # Check permissions
1762                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1763                 if ( count( $permissionErrors ) ) {
1764                         throw new PermissionsError( 'delete', $permissionErrors );
1765                 }
1766
1767                 # Read-only check...
1768                 if ( wfReadOnly() ) {
1769                         throw new ReadOnlyError;
1770                 }
1771
1772                 # Better double-check that it hasn't been deleted yet!
1773                 $this->mPage->loadPageData(
1774                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1775                 );
1776                 if ( !$this->mPage->exists() ) {
1777                         $deleteLogPage = new LogPage( 'delete' );
1778                         $outputPage = $context->getOutput();
1779                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1780                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1781                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1782                                 );
1783                         $outputPage->addHTML(
1784                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1785                         );
1786                         LogEventsList::showLogExtract(
1787                                 $outputPage,
1788                                 'delete',
1789                                 $title
1790                         );
1791
1792                         return;
1793                 }
1794
1795                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1796                 $deleteReason = $request->getText( 'wpReason' );
1797
1798                 if ( $deleteReasonList == 'other' ) {
1799                         $reason = $deleteReason;
1800                 } elseif ( $deleteReason != '' ) {
1801                         // Entry from drop down menu + additional comment
1802                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1803                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1804                 } else {
1805                         $reason = $deleteReasonList;
1806                 }
1807
1808                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1809                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1810                 ) {
1811                         # Flag to hide all contents of the archived revisions
1812                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1813
1814                         $this->doDelete( $reason, $suppress );
1815
1816                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1817
1818                         return;
1819                 }
1820
1821                 // Generate deletion reason
1822                 $hasHistory = false;
1823                 if ( !$reason ) {
1824                         try {
1825                                 $reason = $this->generateReason( $hasHistory );
1826                         } catch ( Exception $e ) {
1827                                 # if a page is horribly broken, we still want to be able to
1828                                 # delete it. So be lenient about errors here.
1829                                 wfDebug( "Error while building auto delete summary: $e" );
1830                                 $reason = '';
1831                         }
1832                 }
1833
1834                 // If the page has a history, insert a warning
1835                 if ( $hasHistory ) {
1836                         $title = $this->getTitle();
1837
1838                         // The following can use the real revision count as this is only being shown for users
1839                         // that can delete this page.
1840                         // This, as a side-effect, also makes sure that the following query isn't being run for
1841                         // pages with a larger history, unless the user has the 'bigdelete' right
1842                         // (and is about to delete this page).
1843                         $dbr = wfGetDB( DB_REPLICA );
1844                         $revisions = $edits = (int)$dbr->selectField(
1845                                 'revision',
1846                                 'COUNT(rev_page)',
1847                                 [ 'rev_page' => $title->getArticleID() ],
1848                                 __METHOD__
1849                         );
1850
1851                         // @todo i18n issue/patchwork message
1852                         $context->getOutput()->addHTML(
1853                                 '<strong class="mw-delete-warning-revisions">' .
1854                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1855                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1856                                         $context->msg( 'history' )->escaped(),
1857                                         [],
1858                                         [ 'action' => 'history' ] ) .
1859                                 '</strong>'
1860                         );
1861
1862                         if ( $title->isBigDeletion() ) {
1863                                 global $wgDeleteRevisionsLimit;
1864                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1865                                         [
1866                                                 'delete-warning-toobig',
1867                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1868                                         ]
1869                                 );
1870                         }
1871                 }
1872
1873                 $this->confirmDelete( $reason );
1874         }
1875
1876         /**
1877          * Output deletion confirmation dialog
1878          * @todo Move to another file?
1879          * @param string $reason Prefilled reason
1880          */
1881         public function confirmDelete( $reason ) {
1882                 wfDebug( "Article::confirmDelete\n" );
1883
1884                 $title = $this->getTitle();
1885                 $ctx = $this->getContext();
1886                 $outputPage = $ctx->getOutput();
1887                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1888                 $outputPage->addBacklinkSubtitle( $title );
1889                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1890                 $outputPage->addModules( 'mediawiki.action.delete' );
1891
1892                 $backlinkCache = $title->getBacklinkCache();
1893                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1894                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1895                                 'deleting-backlinks-warning' );
1896                 }
1897
1898                 $subpageQueryLimit = 51;
1899                 $subpages = $title->getSubpages( $subpageQueryLimit );
1900                 $subpageCount = count( $subpages );
1901                 if ( $subpageCount > 0 ) {
1902                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1903                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1904                 }
1905                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1906
1907                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1908
1909                 $user = $this->getContext()->getUser();
1910                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1911
1912                 $outputPage->enableOOUI();
1913
1914                 $options = Xml::listDropDownOptions(
1915                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1916                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1917                 );
1918                 $options = Xml::listDropDownOptionsOoui( $options );
1919
1920                 $fields[] = new OOUI\FieldLayout(
1921                         new OOUI\DropdownInputWidget( [
1922                                 'name' => 'wpDeleteReasonList',
1923                                 'inputId' => 'wpDeleteReasonList',
1924                                 'tabIndex' => 1,
1925                                 'infusable' => true,
1926                                 'value' => '',
1927                                 'options' => $options
1928                         ] ),
1929                         [
1930                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1931                                 'align' => 'top',
1932                         ]
1933                 );
1934
1935                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1936                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1937                 // Unicode codepoints (or 255 UTF-8 bytes for old schema).
1938                 $conf = $this->getContext()->getConfig();
1939                 $oldCommentSchema = $conf->get( 'CommentTableSchemaMigrationStage' ) === MIGRATION_OLD;
1940                 $fields[] = new OOUI\FieldLayout(
1941                         new OOUI\TextInputWidget( [
1942                                 'name' => 'wpReason',
1943                                 'inputId' => 'wpReason',
1944                                 'tabIndex' => 2,
1945                                 'maxLength' => $oldCommentSchema ? 255 : CommentStore::COMMENT_CHARACTER_LIMIT,
1946                                 'infusable' => true,
1947                                 'value' => $reason,
1948                                 'autofocus' => true,
1949                         ] ),
1950                         [
1951                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1952                                 'align' => 'top',
1953                         ]
1954                 );
1955
1956                 if ( $user->isLoggedIn() ) {
1957                         $fields[] = new OOUI\FieldLayout(
1958                                 new OOUI\CheckboxInputWidget( [
1959                                         'name' => 'wpWatch',
1960                                         'inputId' => 'wpWatch',
1961                                         'tabIndex' => 3,
1962                                         'selected' => $checkWatch,
1963                                 ] ),
1964                                 [
1965                                         'label' => $ctx->msg( 'watchthis' )->text(),
1966                                         'align' => 'inline',
1967                                         'infusable' => true,
1968                                 ]
1969                         );
1970                 }
1971
1972                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1973                         $fields[] = new OOUI\FieldLayout(
1974                                 new OOUI\CheckboxInputWidget( [
1975                                         'name' => 'wpSuppress',
1976                                         'inputId' => 'wpSuppress',
1977                                         'tabIndex' => 4,
1978                                 ] ),
1979                                 [
1980                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1981                                         'align' => 'inline',
1982                                         'infusable' => true,
1983                                 ]
1984                         );
1985                 }
1986
1987                 $fields[] = new OOUI\FieldLayout(
1988                         new OOUI\ButtonInputWidget( [
1989                                 'name' => 'wpConfirmB',
1990                                 'inputId' => 'wpConfirmB',
1991                                 'tabIndex' => 5,
1992                                 'value' => $ctx->msg( 'deletepage' )->text(),
1993                                 'label' => $ctx->msg( 'deletepage' )->text(),
1994                                 'flags' => [ 'primary', 'destructive' ],
1995                                 'type' => 'submit',
1996                         ] ),
1997                         [
1998                                 'align' => 'top',
1999                         ]
2000                 );
2001
2002                 $fieldset = new OOUI\FieldsetLayout( [
2003                         'label' => $ctx->msg( 'delete-legend' )->text(),
2004                         'id' => 'mw-delete-table',
2005                         'items' => $fields,
2006                 ] );
2007
2008                 $form = new OOUI\FormLayout( [
2009                         'method' => 'post',
2010                         'action' => $title->getLocalURL( 'action=delete' ),
2011                         'id' => 'deleteconfirm',
2012                 ] );
2013                 $form->appendContent(
2014                         $fieldset,
2015                         new OOUI\HtmlSnippet(
2016                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2017                         )
2018                 );
2019
2020                 $outputPage->addHTML(
2021                         new OOUI\PanelLayout( [
2022                                 'classes' => [ 'deletepage-wrapper' ],
2023                                 'expanded' => false,
2024                                 'padded' => true,
2025                                 'framed' => true,
2026                                 'content' => $form,
2027                         ] )
2028                 );
2029
2030                 if ( $user->isAllowed( 'editinterface' ) ) {
2031                         $link = Linker::linkKnown(
2032                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2033                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2034                                 [],
2035                                 [ 'action' => 'edit' ]
2036                         );
2037                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2038                 }
2039
2040                 $deleteLogPage = new LogPage( 'delete' );
2041                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2042                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2043         }
2044
2045         /**
2046          * Perform a deletion and output success or failure messages
2047          * @param string $reason
2048          * @param bool $suppress
2049          */
2050         public function doDelete( $reason, $suppress = false ) {
2051                 $error = '';
2052                 $context = $this->getContext();
2053                 $outputPage = $context->getOutput();
2054                 $user = $context->getUser();
2055                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user );
2056
2057                 if ( $status->isGood() ) {
2058                         $deleted = $this->getTitle()->getPrefixedText();
2059
2060                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2061                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2062
2063                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2064
2065                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2066
2067                         Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2068
2069                         $outputPage->returnToMain( false );
2070                 } else {
2071                         $outputPage->setPageTitle(
2072                                 wfMessage( 'cannotdelete-title',
2073                                         $this->getTitle()->getPrefixedText() )
2074                         );
2075
2076                         if ( $error == '' ) {
2077                                 $outputPage->addWikiText(
2078                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
2079                                 );
2080                                 $deleteLogPage = new LogPage( 'delete' );
2081                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2082
2083                                 LogEventsList::showLogExtract(
2084                                         $outputPage,
2085                                         'delete',
2086                                         $this->getTitle()
2087                                 );
2088                         } else {
2089                                 $outputPage->addHTML( $error );
2090                         }
2091                 }
2092         }
2093
2094         /* Caching functions */
2095
2096         /**
2097          * checkLastModified returns true if it has taken care of all
2098          * output to the client that is necessary for this request.
2099          * (that is, it has sent a cached version of the page)
2100          *
2101          * @return bool True if cached version send, false otherwise
2102          */
2103         protected function tryFileCache() {
2104                 static $called = false;
2105
2106                 if ( $called ) {
2107                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2108                         return false;
2109                 }
2110
2111                 $called = true;
2112                 if ( $this->isFileCacheable() ) {
2113                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2114                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2115                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2116                                 $cache->loadFromFileCache( $this->getContext() );
2117                                 return true;
2118                         } else {
2119                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2120                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2121                         }
2122                 } else {
2123                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2124                 }
2125
2126                 return false;
2127         }
2128
2129         /**
2130          * Check if the page can be cached
2131          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2132          * @return bool
2133          */
2134         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2135                 $cacheable = false;
2136
2137                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2138                         $cacheable = $this->mPage->getId()
2139                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2140                         // Extension may have reason to disable file caching on some pages.
2141                         if ( $cacheable ) {
2142                                 // Avoid PHP 7.1 warning of passing $this by reference
2143                                 $articlePage = $this;
2144                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2145                         }
2146                 }
2147
2148                 return $cacheable;
2149         }
2150
2151         /**#@-*/
2152
2153         /**
2154          * Lightweight method to get the parser output for a page, checking the parser cache
2155          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
2156          * consider, so it's not appropriate to use there.
2157          *
2158          * @since 1.16 (r52326) for LiquidThreads
2159          *
2160          * @param int|null $oldid Revision ID or null
2161          * @param User|null $user The relevant user
2162          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2163          */
2164         public function getParserOutput( $oldid = null, User $user = null ) {
2165                 // XXX: bypasses mParserOptions and thus setParserOptions()
2166
2167                 if ( $user === null ) {
2168                         $parserOptions = $this->getParserOptions();
2169                 } else {
2170                         $parserOptions = $this->mPage->makeParserOptions( $user );
2171                 }
2172
2173                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2174         }
2175
2176         /**
2177          * Override the ParserOptions used to render the primary article wikitext.
2178          *
2179          * @param ParserOptions $options
2180          * @throws MWException If the parser options where already initialized.
2181          */
2182         public function setParserOptions( ParserOptions $options ) {
2183                 if ( $this->mParserOptions ) {
2184                         throw new MWException( "can't change parser options after they have already been set" );
2185                 }
2186
2187                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2188                 $this->mParserOptions = clone $options;
2189         }
2190
2191         /**
2192          * Get parser options suitable for rendering the primary article wikitext
2193          * @return ParserOptions
2194          */
2195         public function getParserOptions() {
2196                 if ( !$this->mParserOptions ) {
2197                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2198                 }
2199                 // Clone to allow modifications of the return value without affecting cache
2200                 return clone $this->mParserOptions;
2201         }
2202
2203         /**
2204          * Sets the context this Article is executed in
2205          *
2206          * @param IContextSource $context
2207          * @since 1.18
2208          */
2209         public function setContext( $context ) {
2210                 $this->mContext = $context;
2211         }
2212
2213         /**
2214          * Gets the context this Article is executed in
2215          *
2216          * @return IContextSource
2217          * @since 1.18
2218          */
2219         public function getContext() {
2220                 if ( $this->mContext instanceof IContextSource ) {
2221                         return $this->mContext;
2222                 } else {
2223                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2224                                 "Return RequestContext::getMain(); for sanity\n" );
2225                         return RequestContext::getMain();
2226                 }
2227         }
2228
2229         /**
2230          * Use PHP's magic __get handler to handle accessing of
2231          * raw WikiPage fields for backwards compatibility.
2232          *
2233          * @param string $fname Field name
2234          * @return mixed
2235          */
2236         public function __get( $fname ) {
2237                 if ( property_exists( $this->mPage, $fname ) ) {
2238                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2239                         return $this->mPage->$fname;
2240                 }
2241                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2242         }
2243
2244         /**
2245          * Use PHP's magic __set handler to handle setting of
2246          * raw WikiPage fields for backwards compatibility.
2247          *
2248          * @param string $fname Field name
2249          * @param mixed $fvalue New value
2250          */
2251         public function __set( $fname, $fvalue ) {
2252                 if ( property_exists( $this->mPage, $fname ) ) {
2253                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2254                         $this->mPage->$fname = $fvalue;
2255                 // Note: extensions may want to toss on new fields
2256                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2257                         $this->mPage->$fname = $fvalue;
2258                 } else {
2259                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2260                 }
2261         }
2262
2263         /**
2264          * Call to WikiPage function for backwards compatibility.
2265          * @see WikiPage::checkFlags
2266          */
2267         public function checkFlags( $flags ) {
2268                 return $this->mPage->checkFlags( $flags );
2269         }
2270
2271         /**
2272          * Call to WikiPage function for backwards compatibility.
2273          * @see WikiPage::checkTouched
2274          */
2275         public function checkTouched() {
2276                 return $this->mPage->checkTouched();
2277         }
2278
2279         /**
2280          * Call to WikiPage function for backwards compatibility.
2281          * @see WikiPage::clearPreparedEdit
2282          */
2283         public function clearPreparedEdit() {
2284                 $this->mPage->clearPreparedEdit();
2285         }
2286
2287         /**
2288          * Call to WikiPage function for backwards compatibility.
2289          * @see WikiPage::doDeleteArticleReal
2290          */
2291         public function doDeleteArticleReal(
2292                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2293                 $tags = []
2294         ) {
2295                 return $this->mPage->doDeleteArticleReal(
2296                         $reason, $suppress, $u1, $u2, $error, $user, $tags
2297                 );
2298         }
2299
2300         /**
2301          * Call to WikiPage function for backwards compatibility.
2302          * @see WikiPage::doDeleteUpdates
2303          */
2304         public function doDeleteUpdates( $id, Content $content = null ) {
2305                 return $this->mPage->doDeleteUpdates( $id, $content );
2306         }
2307
2308         /**
2309          * Call to WikiPage function for backwards compatibility.
2310          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2311          * @see WikiPage::doEditContent
2312          */
2313         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2314                 User $user = null, $serialFormat = null
2315         ) {
2316                 wfDeprecated( __METHOD__, '1.29' );
2317                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2318                         $user, $serialFormat
2319                 );
2320         }
2321
2322         /**
2323          * Call to WikiPage function for backwards compatibility.
2324          * @see WikiPage::doEditUpdates
2325          */
2326         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2327                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2328         }
2329
2330         /**
2331          * Call to WikiPage function for backwards compatibility.
2332          * @see WikiPage::doPurge
2333          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2334          *  controlled how much purging was done.
2335          */
2336         public function doPurge() {
2337                 return $this->mPage->doPurge();
2338         }
2339
2340         /**
2341          * Call to WikiPage function for backwards compatibility.
2342          * @see WikiPage::doViewUpdates
2343          */
2344         public function doViewUpdates( User $user, $oldid = 0 ) {
2345                 $this->mPage->doViewUpdates( $user, $oldid );
2346         }
2347
2348         /**
2349          * Call to WikiPage function for backwards compatibility.
2350          * @see WikiPage::exists
2351          */
2352         public function exists() {
2353                 return $this->mPage->exists();
2354         }
2355
2356         /**
2357          * Call to WikiPage function for backwards compatibility.
2358          * @see WikiPage::followRedirect
2359          */
2360         public function followRedirect() {
2361                 return $this->mPage->followRedirect();
2362         }
2363
2364         /**
2365          * Call to WikiPage function for backwards compatibility.
2366          * @see ContentHandler::getActionOverrides
2367          */
2368         public function getActionOverrides() {
2369                 return $this->mPage->getActionOverrides();
2370         }
2371
2372         /**
2373          * Call to WikiPage function for backwards compatibility.
2374          * @see WikiPage::getAutoDeleteReason
2375          */
2376         public function getAutoDeleteReason( &$hasHistory ) {
2377                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2378         }
2379
2380         /**
2381          * Call to WikiPage function for backwards compatibility.
2382          * @see WikiPage::getCategories
2383          */
2384         public function getCategories() {
2385                 return $this->mPage->getCategories();
2386         }
2387
2388         /**
2389          * Call to WikiPage function for backwards compatibility.
2390          * @see WikiPage::getComment
2391          */
2392         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2393                 return $this->mPage->getComment( $audience, $user );
2394         }
2395
2396         /**
2397          * Call to WikiPage function for backwards compatibility.
2398          * @see WikiPage::getContentHandler
2399          */
2400         public function getContentHandler() {
2401                 return $this->mPage->getContentHandler();
2402         }
2403
2404         /**
2405          * Call to WikiPage function for backwards compatibility.
2406          * @see WikiPage::getContentModel
2407          */
2408         public function getContentModel() {
2409                 return $this->mPage->getContentModel();
2410         }
2411
2412         /**
2413          * Call to WikiPage function for backwards compatibility.
2414          * @see WikiPage::getContributors
2415          */
2416         public function getContributors() {
2417                 return $this->mPage->getContributors();
2418         }
2419
2420         /**
2421          * Call to WikiPage function for backwards compatibility.
2422          * @see WikiPage::getCreator
2423          */
2424         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2425                 return $this->mPage->getCreator( $audience, $user );
2426         }
2427
2428         /**
2429          * Call to WikiPage function for backwards compatibility.
2430          * @see WikiPage::getDeletionUpdates
2431          */
2432         public function getDeletionUpdates( Content $content = null ) {
2433                 return $this->mPage->getDeletionUpdates( $content );
2434         }
2435
2436         /**
2437          * Call to WikiPage function for backwards compatibility.
2438          * @see WikiPage::getHiddenCategories
2439          */
2440         public function getHiddenCategories() {
2441                 return $this->mPage->getHiddenCategories();
2442         }
2443
2444         /**
2445          * Call to WikiPage function for backwards compatibility.
2446          * @see WikiPage::getId
2447          */
2448         public function getId() {
2449                 return $this->mPage->getId();
2450         }
2451
2452         /**
2453          * Call to WikiPage function for backwards compatibility.
2454          * @see WikiPage::getLatest
2455          */
2456         public function getLatest() {
2457                 return $this->mPage->getLatest();
2458         }
2459
2460         /**
2461          * Call to WikiPage function for backwards compatibility.
2462          * @see WikiPage::getLinksTimestamp
2463          */
2464         public function getLinksTimestamp() {
2465                 return $this->mPage->getLinksTimestamp();
2466         }
2467
2468         /**
2469          * Call to WikiPage function for backwards compatibility.
2470          * @see WikiPage::getMinorEdit
2471          */
2472         public function getMinorEdit() {
2473                 return $this->mPage->getMinorEdit();
2474         }
2475
2476         /**
2477          * Call to WikiPage function for backwards compatibility.
2478          * @see WikiPage::getOldestRevision
2479          */
2480         public function getOldestRevision() {
2481                 return $this->mPage->getOldestRevision();
2482         }
2483
2484         /**
2485          * Call to WikiPage function for backwards compatibility.
2486          * @see WikiPage::getRedirectTarget
2487          */
2488         public function getRedirectTarget() {
2489                 return $this->mPage->getRedirectTarget();
2490         }
2491
2492         /**
2493          * Call to WikiPage function for backwards compatibility.
2494          * @see WikiPage::getRedirectURL
2495          */
2496         public function getRedirectURL( $rt ) {
2497                 return $this->mPage->getRedirectURL( $rt );
2498         }
2499
2500         /**
2501          * Call to WikiPage function for backwards compatibility.
2502          * @see WikiPage::getRevision
2503          */
2504         public function getRevision() {
2505                 return $this->mPage->getRevision();
2506         }
2507
2508         /**
2509          * Call to WikiPage function for backwards compatibility.
2510          * @see WikiPage::getTimestamp
2511          */
2512         public function getTimestamp() {
2513                 return $this->mPage->getTimestamp();
2514         }
2515
2516         /**
2517          * Call to WikiPage function for backwards compatibility.
2518          * @see WikiPage::getTouched
2519          */
2520         public function getTouched() {
2521                 return $this->mPage->getTouched();
2522         }
2523
2524         /**
2525          * Call to WikiPage function for backwards compatibility.
2526          * @see WikiPage::getUndoContent
2527          */
2528         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2529                 return $this->mPage->getUndoContent( $undo, $undoafter );
2530         }
2531
2532         /**
2533          * Call to WikiPage function for backwards compatibility.
2534          * @see WikiPage::getUser
2535          */
2536         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2537                 return $this->mPage->getUser( $audience, $user );
2538         }
2539
2540         /**
2541          * Call to WikiPage function for backwards compatibility.
2542          * @see WikiPage::getUserText
2543          */
2544         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2545                 return $this->mPage->getUserText( $audience, $user );
2546         }
2547
2548         /**
2549          * Call to WikiPage function for backwards compatibility.
2550          * @see WikiPage::hasViewableContent
2551          */
2552         public function hasViewableContent() {
2553                 return $this->mPage->hasViewableContent();
2554         }
2555
2556         /**
2557          * Call to WikiPage function for backwards compatibility.
2558          * @see WikiPage::insertOn
2559          */
2560         public function insertOn( $dbw, $pageId = null ) {
2561                 return $this->mPage->insertOn( $dbw, $pageId );
2562         }
2563
2564         /**
2565          * Call to WikiPage function for backwards compatibility.
2566          * @see WikiPage::insertProtectNullRevision
2567          */
2568         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2569                 array $expiry, $cascade, $reason, $user = null
2570         ) {
2571                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2572                         $expiry, $cascade, $reason, $user
2573                 );
2574         }
2575
2576         /**
2577          * Call to WikiPage function for backwards compatibility.
2578          * @see WikiPage::insertRedirect
2579          */
2580         public function insertRedirect() {
2581                 return $this->mPage->insertRedirect();
2582         }
2583
2584         /**
2585          * Call to WikiPage function for backwards compatibility.
2586          * @see WikiPage::insertRedirectEntry
2587          */
2588         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2589                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2590         }
2591
2592         /**
2593          * Call to WikiPage function for backwards compatibility.
2594          * @see WikiPage::isCountable
2595          */
2596         public function isCountable( $editInfo = false ) {
2597                 return $this->mPage->isCountable( $editInfo );
2598         }
2599
2600         /**
2601          * Call to WikiPage function for backwards compatibility.
2602          * @see WikiPage::isRedirect
2603          */
2604         public function isRedirect() {
2605                 return $this->mPage->isRedirect();
2606         }
2607
2608         /**
2609          * Call to WikiPage function for backwards compatibility.
2610          * @see WikiPage::loadFromRow
2611          */
2612         public function loadFromRow( $data, $from ) {
2613                 return $this->mPage->loadFromRow( $data, $from );
2614         }
2615
2616         /**
2617          * Call to WikiPage function for backwards compatibility.
2618          * @see WikiPage::loadPageData
2619          */
2620         public function loadPageData( $from = 'fromdb' ) {
2621                 $this->mPage->loadPageData( $from );
2622         }
2623
2624         /**
2625          * Call to WikiPage function for backwards compatibility.
2626          * @see WikiPage::lockAndGetLatest
2627          */
2628         public function lockAndGetLatest() {
2629                 return $this->mPage->lockAndGetLatest();
2630         }
2631
2632         /**
2633          * Call to WikiPage function for backwards compatibility.
2634          * @see WikiPage::makeParserOptions
2635          */
2636         public function makeParserOptions( $context ) {
2637                 return $this->mPage->makeParserOptions( $context );
2638         }
2639
2640         /**
2641          * Call to WikiPage function for backwards compatibility.
2642          * @see WikiPage::pageDataFromId
2643          */
2644         public function pageDataFromId( $dbr, $id, $options = [] ) {
2645                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2646         }
2647
2648         /**
2649          * Call to WikiPage function for backwards compatibility.
2650          * @see WikiPage::pageDataFromTitle
2651          */
2652         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2653                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2654         }
2655
2656         /**
2657          * Call to WikiPage function for backwards compatibility.
2658          * @see WikiPage::prepareContentForEdit
2659          */
2660         public function prepareContentForEdit(
2661                 Content $content, $revision = null, User $user = null,
2662                 $serialFormat = null, $useCache = true
2663         ) {
2664                 return $this->mPage->prepareContentForEdit(
2665                         $content, $revision, $user,
2666                         $serialFormat, $useCache
2667                 );
2668         }
2669
2670         /**
2671          * Call to WikiPage function for backwards compatibility.
2672          * @see WikiPage::protectDescription
2673          */
2674         public function protectDescription( array $limit, array $expiry ) {
2675                 return $this->mPage->protectDescription( $limit, $expiry );
2676         }
2677
2678         /**
2679          * Call to WikiPage function for backwards compatibility.
2680          * @see WikiPage::protectDescriptionLog
2681          */
2682         public function protectDescriptionLog( array $limit, array $expiry ) {
2683                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2684         }
2685
2686         /**
2687          * Call to WikiPage function for backwards compatibility.
2688          * @see WikiPage::replaceSectionAtRev
2689          */
2690         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2691                 $sectionTitle = '', $baseRevId = null
2692         ) {
2693                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2694                         $sectionTitle, $baseRevId
2695                 );
2696         }
2697
2698         /**
2699          * Call to WikiPage function for backwards compatibility.
2700          * @see WikiPage::replaceSectionContent
2701          */
2702         public function replaceSectionContent(
2703                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2704         ) {
2705                 return $this->mPage->replaceSectionContent(
2706                         $sectionId, $sectionContent, $sectionTitle, $edittime
2707                 );
2708         }
2709
2710         /**
2711          * Call to WikiPage function for backwards compatibility.
2712          * @see WikiPage::setTimestamp
2713          */
2714         public function setTimestamp( $ts ) {
2715                 return $this->mPage->setTimestamp( $ts );
2716         }
2717
2718         /**
2719          * Call to WikiPage function for backwards compatibility.
2720          * @see WikiPage::shouldCheckParserCache
2721          */
2722         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2723                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2724         }
2725
2726         /**
2727          * Call to WikiPage function for backwards compatibility.
2728          * @see WikiPage::supportsSections
2729          */
2730         public function supportsSections() {
2731                 return $this->mPage->supportsSections();
2732         }
2733
2734         /**
2735          * Call to WikiPage function for backwards compatibility.
2736          * @see WikiPage::triggerOpportunisticLinksUpdate
2737          */
2738         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2739                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2740         }
2741
2742         /**
2743          * Call to WikiPage function for backwards compatibility.
2744          * @see WikiPage::updateCategoryCounts
2745          */
2746         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2747                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2748         }
2749
2750         /**
2751          * Call to WikiPage function for backwards compatibility.
2752          * @see WikiPage::updateIfNewerOn
2753          */
2754         public function updateIfNewerOn( $dbw, $revision ) {
2755                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2756         }
2757
2758         /**
2759          * Call to WikiPage function for backwards compatibility.
2760          * @see WikiPage::updateRedirectOn
2761          */
2762         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2763                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2764         }
2765
2766         /**
2767          * Call to WikiPage function for backwards compatibility.
2768          * @see WikiPage::updateRevisionOn
2769          */
2770         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2771                 $lastRevIsRedirect = null
2772         ) {
2773                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2774                         $lastRevIsRedirect
2775                 );
2776         }
2777
2778         /**
2779          * @param array $limit
2780          * @param array $expiry
2781          * @param bool &$cascade
2782          * @param string $reason
2783          * @param User $user
2784          * @return Status
2785          */
2786         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2787                 $reason, User $user
2788         ) {
2789                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2790         }
2791
2792         /**
2793          * @param array $limit
2794          * @param string $reason
2795          * @param int &$cascade
2796          * @param array $expiry
2797          * @return bool
2798          */
2799         public function updateRestrictions( $limit = [], $reason = '',
2800                 &$cascade = 0, $expiry = []
2801         ) {
2802                 return $this->mPage->doUpdateRestrictions(
2803                         $limit,
2804                         $expiry,
2805                         $cascade,
2806                         $reason,
2807                         $this->getContext()->getUser()
2808                 );
2809         }
2810
2811         /**
2812          * @param string $reason
2813          * @param bool $suppress
2814          * @param int|null $u1 Unused
2815          * @param bool|null $u2 Unused
2816          * @param string &$error
2817          * @return bool
2818          */
2819         public function doDeleteArticle(
2820                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = ''
2821         ) {
2822                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error );
2823         }
2824
2825         /**
2826          * @param string $fromP
2827          * @param string $summary
2828          * @param string $token
2829          * @param bool $bot
2830          * @param array &$resultDetails
2831          * @param User|null $user
2832          * @return array
2833          */
2834         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2835                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2836                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2837         }
2838
2839         /**
2840          * @param string $fromP
2841          * @param string $summary
2842          * @param bool $bot
2843          * @param array &$resultDetails
2844          * @param User|null $guser
2845          * @return array
2846          */
2847         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2848                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2849                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2850         }
2851
2852         /**
2853          * @param bool &$hasHistory
2854          * @return mixed
2855          */
2856         public function generateReason( &$hasHistory ) {
2857                 $title = $this->mPage->getTitle();
2858                 $handler = ContentHandler::getForTitle( $title );
2859                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2860         }
2861
2862         // ******
2863 }