includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Revision\MutableRevisionRecord;
  24 use MediaWiki\Revision\RevisionRecord;
  25 use MediaWiki\Revision\SlotRecord;
  26
  27 /**
  28  * Class for viewing MediaWiki article and history.
  29  *
  30  * This maintains WikiPage functions for backwards compatibility.
  31  *
  32  * @todo Move and rewrite code to an Action class
  33  *
  34  * Note: edit user interface and cache support functions have been
  35  * moved to separate EditPage and HTMLFileCache classes.
  36  */
  37 class Article implements Page {
  38         /**
  39          * @var IContextSource|null The context this Article is executed in.
  40          * If null, RequestContext::getMain() is used.
  41          */
  42         protected $mContext;
  43
  44         /** @var WikiPage|null The WikiPage object of this instance */
  45         protected $mPage;
  46
  47         /**
  48          * @var ParserOptions|null ParserOptions object for $wgUser articles.
  49          * Initialized by getParserOptions by calling $this->mPage->makeParserOptions().
  50          */
  51         public $mParserOptions;
  52
  53         /**
  54          * @var Content|null Content of the main slot of $this->mRevision.
  55          * @note This variable is read only, setting it has no effect.
  56          *       Extensions that wish to override the output of Article::view should use a hook.
  57          * @todo MCR: Remove in 1.33
  58          * @deprecated since 1.32
  59          * @since 1.21
  60          */
  61         public $mContentObject;
  62
  63         /**
  64          * @var bool Is the target revision loaded? Set by fetchRevisionRecord().
  65          *
  66          * @deprecated since 1.32. Whether content has been loaded should not be relevant to
  67          * code outside this class.
  68          */
  69         public $mContentLoaded = false;
  70
  71         /**
  72          * @var int|null The oldid of the article that was requested to be shown,
  73          * 0 for the current revision.
  74          * @see $mRevIdFetched
  75          */
  76         public $mOldId;
  77
  78         /** @var Title|null Title from which we were redirected here, if any. */
  79         public $mRedirectedFrom = null;
  80
  81         /** @var string|bool URL to redirect to or false if none */
  82         public $mRedirectUrl = false;
  83
  84         /**
  85          * @var int Revision ID of revision that was loaded.
  86          * @see $mOldId
  87          * @deprecated since 1.32, use getRevIdFetched() instead.
  88          */
  89         public $mRevIdFetched = 0;
  90
  91         /**
  92          * @var Status|null represents the outcome of fetchRevisionRecord().
  93          * $fetchResult->value is the RevisionRecord object, if the operation was successful.
  94          *
  95          * The information in $fetchResult is duplicated by the following deprecated public fields:
  96          * $mRevIdFetched, $mContentLoaded. $mRevision (and $mContentObject) also typically duplicate
  97          * information of the loaded revision, but may be overwritten by extensions or due to errors.
  98          */
  99         private $fetchResult = null;
 100
 101         /**
 102          * @var Revision|null Revision to be shown. Initialized by getOldIDFromRequest()
 103          * or fetchContentObject(). Normally loaded from the database, but may be replaced
 104          * by an extension, or be a fake representing an error message or some such.
 105          * While the output of Article::view is typically based on this revision,
 106          * it may be overwritten by error messages or replaced by extensions.
 107          */
 108         public $mRevision = null;
 109
 110         /**
 111          * @var ParserOutput|null|false The ParserOutput generated for viewing the page,
 112          * initialized by view(). If no ParserOutput could be generated, this is set to false.
 113          * @deprecated since 1.32
 114          */
 115         public $mParserOutput = null;
 116
 117         /**
 118          * @var bool Whether render() was called. With the way subclasses work
 119          * here, there doesn't seem to be any other way to stop calling
 120          * OutputPage::enableSectionEditLinks() and still have it work as it did before.
 121          */
 122         protected $viewIsRenderAction = false;
 123
 124         /**
 125          * Constructor and clear the article
 126          * @param Title $title Reference to a Title object.
 127          * @param int|null $oldId Revision ID, null to fetch from request, zero for current
 128          */
 129         public function __construct( Title $title, $oldId = null ) {
 130                 $this->mOldId = $oldId;
 131                 $this->mPage = $this->newPage( $title );
 132         }
 133
 134         /**
 135          * @param Title $title
 136          * @return WikiPage
 137          */
 138         protected function newPage( Title $title ) {
 139                 return new WikiPage( $title );
 140         }
 141
 142         /**
 143          * Constructor from a page id
 144          * @param int $id Article ID to load
 145          * @return Article|null
 146          */
 147         public static function newFromID( $id ) {
 148                 $t = Title::newFromID( $id );
 149                 return $t == null ? null : new static( $t );
 150         }
 151
 152         /**
 153          * Create an Article object of the appropriate class for the given page.
 154          *
 155          * @param Title $title
 156          * @param IContextSource $context
 157          * @return Article
 158          */
 159         public static function newFromTitle( $title, IContextSource $context ) {
 160                 if ( NS_MEDIA == $title->getNamespace() ) {
 161                         // XXX: This should not be here, but where should it go?
 162                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 163                 }
 164
 165                 $page = null;
 166                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 167                 if ( !$page ) {
 168                         switch ( $title->getNamespace() ) {
 169                                 case NS_FILE:
 170                                         $page = new ImagePage( $title );
 171                                         break;
 172                                 case NS_CATEGORY:
 173                                         $page = new CategoryPage( $title );
 174                                         break;
 175                                 default:
 176                                         $page = new Article( $title );
 177                         }
 178                 }
 179                 $page->setContext( $context );
 180
 181                 return $page;
 182         }
 183
 184         /**
 185          * Create an Article object of the appropriate class for the given page.
 186          *
 187          * @param WikiPage $page
 188          * @param IContextSource $context
 189          * @return Article
 190          */
 191         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 192                 $article = self::newFromTitle( $page->getTitle(), $context );
 193                 $article->mPage = $page; // override to keep process cached vars
 194                 return $article;
 195         }
 196
 197         /**
 198          * Get the page this view was redirected from
 199          * @return Title|null
 200          * @since 1.28
 201          */
 202         public function getRedirectedFrom() {
 203                 return $this->mRedirectedFrom;
 204         }
 205
 206         /**
 207          * Tell the page view functions that this view was redirected
 208          * from another page on the wiki.
 209          * @param Title $from
 210          */
 211         public function setRedirectedFrom( Title $from ) {
 212                 $this->mRedirectedFrom = $from;
 213         }
 214
 215         /**
 216          * Get the title object of the article
 217          *
 218          * @return Title Title object of this page
 219          */
 220         public function getTitle() {
 221                 return $this->mPage->getTitle();
 222         }
 223
 224         /**
 225          * Get the WikiPage object of this instance
 226          *
 227          * @since 1.19
 228          * @return WikiPage
 229          */
 230         public function getPage() {
 231                 return $this->mPage;
 232         }
 233
 234         /**
 235          * Clear the object
 236          */
 237         public function clear() {
 238                 $this->mContentLoaded = false;
 239
 240                 $this->mRedirectedFrom = null; # Title object if set
 241                 $this->mRevIdFetched = 0;
 242                 $this->mRedirectUrl = false;
 243                 $this->mRevision = null;
 244                 $this->mContentObject = null;
 245                 $this->fetchResult = null;
 246
 247                 // TODO hard-deprecate direct access to public fields
 248
 249                 $this->mPage->clear();
 250         }
 251
 252         /**
 253          * Returns a Content object representing the pages effective display content,
 254          * not necessarily the revision's content!
 255          *
 256          * Note that getContent does not follow redirects anymore.
 257          * If you need to fetch redirectable content easily, try
 258          * the shortcut in WikiPage::getRedirectTarget()
 259          *
 260          * This function has side effects! Do not use this function if you
 261          * only want the real revision text if any.
 262          *
 263          * @deprecated since 1.32, use getRevisionFetched() or fetchRevisionRecord() instead.
 264          *
 265          * @return Content
 266          *
 267          * @since 1.21
 268          */
 269         protected function getContentObject() {
 270                 if ( $this->mPage->getId() === 0 ) {
 271                         $content = $this->getSubstituteContent();
 272                 } else {
 273                         $this->fetchContentObject();
 274                         $content = $this->mContentObject;
 275                 }
 276
 277                 return $content;
 278         }
 279
 280         /**
 281          * Returns Content object to use when the page does not exist.
 282          *
 283          * @return Content
 284          */
 285         private function getSubstituteContent() {
 286                 # If this is a MediaWiki:x message, then load the messages
 287                 # and return the message value for x.
 288                 if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 289                         $text = $this->getTitle()->getDefaultMessageText();
 290                         if ( $text === false ) {
 291                                 $text = '';
 292                         }
 293
 294                         $content = ContentHandler::makeContent( $text, $this->getTitle() );
 295                 } else {
 296                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 297                         $content = new MessageContent( $message, null );
 298                 }
 299
 300                 return $content;
 301         }
 302
 303         /**
 304          * Returns ParserOutput to use when a page does not exist. In some cases, we still want to show
 305          * "virtual" content, e.g. in the MediaWiki namespace, or in the File namespace for non-local
 306          * files.
 307          *
 308          * @param ParserOptions $options
 309          *
 310          * @return ParserOutput
 311          */
 312         protected function getEmptyPageParserOutput( ParserOptions $options ) {
 313                 $content = $this->getSubstituteContent();
 314
 315                 return $content->getParserOutput( $this->getTitle(), 0, $options );
 316         }
 317
 318         /**
 319          * @see getOldIDFromRequest()
 320          * @see getRevIdFetched()
 321          *
 322          * @return int The oldid of the article that is was requested in the constructor or via the
 323          *         context's WebRequest.
 324          */
 325         public function getOldID() {
 326                 if ( is_null( $this->mOldId ) ) {
 327                         $this->mOldId = $this->getOldIDFromRequest();
 328                 }
 329
 330                 return $this->mOldId;
 331         }
 332
 333         /**
 334          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 335          *
 336          * @return int The old id for the request
 337          */
 338         public function getOldIDFromRequest() {
 339                 $this->mRedirectUrl = false;
 340
 341                 $request = $this->getContext()->getRequest();
 342                 $oldid = $request->getIntOrNull( 'oldid' );
 343
 344                 if ( $oldid === null ) {
 345                         return 0;
 346                 }
 347
 348                 if ( $oldid !== 0 ) {
 349                         # Load the given revision and check whether the page is another one.
 350                         # In that case, update this instance to reflect the change.
 351                         if ( $oldid === $this->mPage->getLatest() ) {
 352                                 $this->mRevision = $this->mPage->getRevision();
 353                         } else {
 354                                 $this->mRevision = Revision::newFromId( $oldid );
 355                                 if ( $this->mRevision !== null ) {
 356                                         // Revision title doesn't match the page title given?
 357                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 358                                                 $function = get_class( $this->mPage ) . '::newFromID';
 359                                                 $this->mPage = $function( $this->mRevision->getPage() );
 360                                         }
 361                                 }
 362                         }
 363                 }
 364
 365                 if ( $request->getVal( 'direction' ) == 'next' ) {
 366                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 367                         if ( $nextid ) {
 368                                 $oldid = $nextid;
 369                                 $this->mRevision = null;
 370                         } else {
 371                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 372                         }
 373                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 374                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 375                         if ( $previd ) {
 376                                 $oldid = $previd;
 377                                 $this->mRevision = null;
 378                         }
 379                 }
 380
 381                 $this->mRevIdFetched = $this->mRevision ? $this->mRevision->getId() : 0;
 382
 383                 return $oldid;
 384         }
 385
 386         /**
 387          * Get text content object
 388          * Does *NOT* follow redirects.
 389          * @todo When is this null?
 390          * @deprecated since 1.32, use fetchRevisionRecord() instead.
 391          *
 392          * @note Code that wants to retrieve page content from the database should
 393          * use WikiPage::getContent().
 394          *
 395          * @return Content|null|bool
 396          *
 397          * @since 1.21
 398          */
 399         protected function fetchContentObject() {
 400                 if ( !$this->mContentLoaded ) {
 401                         $this->fetchRevisionRecord();
 402                 }
 403
 404                 return $this->mContentObject;
 405         }
 406
 407         /**
 408          * Fetches the revision to work on.
 409          * The revision is typically loaded from the database, but may also be a fake representing
 410          * an error message or content supplied by an extension. Refer to $this->fetchResult for
 411          * the revision actually loaded from the database, and any errors encountered while doing
 412          * that.
 413          *
 414          * @return RevisionRecord|null
 415          */
 416         protected function fetchRevisionRecord() {
 417                 if ( $this->fetchResult ) {
 418                         return $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 419                 }
 420
 421                 $this->mContentLoaded = true;
 422                 $this->mContentObject = null;
 423
 424                 $oldid = $this->getOldID();
 425
 426                 // $this->mRevision might already be fetched by getOldIDFromRequest()
 427                 if ( !$this->mRevision ) {
 428                         if ( !$oldid ) {
 429                                 $this->mRevision = $this->mPage->getRevision();
 430
 431                                 if ( !$this->mRevision ) {
 432                                         wfDebug( __METHOD__ . " failed to find page data for title " .
 433                                                 $this->getTitle()->getPrefixedText() . "\n" );
 434
 435                                         // Just for sanity, output for this case is done by showMissingArticle().
 436                                         $this->fetchResult = Status::newFatal( 'noarticletext' );
 437                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 438                                         return null;
 439                                 }
 440                         } else {
 441                                 $this->mRevision = Revision::newFromId( $oldid );
 442
 443                                 if ( !$this->mRevision ) {
 444                                         wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid\n" );
 445
 446                                         $this->fetchResult = Status::newFatal( 'missing-revision', $oldid );
 447                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 448                                         return null;
 449                                 }
 450                         }
 451                 }
 452
 453                 $this->mRevIdFetched = $this->mRevision->getId();
 454                 $this->fetchResult = Status::newGood( $this->mRevision );
 455
 456                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $this->getContext()->getUser() ) ) {
 457                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 458                                 $this->mRevision->getId() . "\n" );
 459
 460                         // Just for sanity, output for this case is done by showDeletedRevisionHeader().
 461                         $this->fetchResult = Status::newFatal( 'rev-deleted-text-permission' );
 462                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 463                         return null;
 464                 }
 465
 466                 if ( Hooks::isRegistered( 'ArticleAfterFetchContentObject' ) ) {
 467                         $contentObject = $this->mRevision->getContent(
 468                                 Revision::FOR_THIS_USER,
 469                                 $this->getContext()->getUser()
 470                         );
 471
 472                         $hookContentObject = $contentObject;
 473
 474                                 // Avoid PHP 7.1 warning of passing $this by reference
 475                         $articlePage = $this;
 476
 477                         Hooks::run(
 478                                 'ArticleAfterFetchContentObject',
 479                                 [ &$articlePage, &$hookContentObject ],
 480                                 '1.32'
 481                         );
 482
 483                         if ( $hookContentObject !== $contentObject ) {
 484                                 // A hook handler is trying to override the content
 485                                 $this->applyContentOverride( $hookContentObject );
 486                         }
 487                 }
 488
 489                 // For B/C only
 490                 $this->mContentObject = $this->mRevision->getContent(
 491                         Revision::FOR_THIS_USER,
 492                         $this->getContext()->getUser()
 493                 );
 494
 495                 return $this->mRevision->getRevisionRecord();
 496         }
 497
 498         /**
 499          * Returns a Content object representing any error in $this->fetchContent, or null
 500          * if there is no such error.
 501          *
 502          * @return Content|null
 503          */
 504         private function makeFetchErrorContent() {
 505                 if ( !$this->fetchResult || $this->fetchResult->isOK() ) {
 506                         return null;
 507                 }
 508
 509                 return new MessageContent( $this->fetchResult->getMessage() );
 510         }
 511
 512         /**
 513          * Applies a content override by constructing a fake Revision object and assigning
 514          * it to mRevision. The fake revision will not have a user, timestamp or summary set.
 515          *
 516          * This mechanism exists mainly to accommodate extensions that use the
 517          * ArticleAfterFetchContentObject. Once that hook has been removed, there should no longer
 518          * be a need for a fake revision object. fetchRevisionRecord() presently also uses this mechanism
 519          * to report errors, but that could be changed to use $this->fetchResult instead.
 520          *
 521          * @param Content $override Content to be used instead of the actual page content,
 522          *        coming from an extension or representing an error message.
 523          */
 524         private function applyContentOverride( Content $override ) {
 525                 // Construct a fake revision
 526                 $rev = new MutableRevisionRecord( $this->getTitle() );
 527                 $rev->setContent( SlotRecord::MAIN, $override );
 528
 529                 $this->mRevision = new Revision( $rev );
 530
 531                 // For B/C only
 532                 $this->mContentObject = $override;
 533         }
 534
 535         /**
 536          * Returns true if the currently-referenced revision is the current edit
 537          * to this page (and it exists).
 538          * @return bool
 539          */
 540         public function isCurrent() {
 541                 # If no oldid, this is the current version.
 542                 if ( $this->getOldID() == 0 ) {
 543                         return true;
 544                 }
 545
 546                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 547         }
 548
 549         /**
 550          * Get the fetched Revision object depending on request parameters or null
 551          * on failure. The revision returned may be a fake representing an error message or
 552          * wrapping content supplied by an extension. Refer to $this->fetchResult for the
 553          * revision actually loaded from the database.
 554          *
 555          * @since 1.19
 556          * @return Revision|null
 557          */
 558         public function getRevisionFetched() {
 559                 $this->fetchRevisionRecord();
 560
 561                 if ( $this->fetchResult->isOK() ) {
 562                         return $this->mRevision;
 563                 }
 564         }
 565
 566         /**
 567          * Use this to fetch the rev ID used on page views
 568          *
 569          * Before fetchRevisionRecord was called, this returns the page's latest revision,
 570          * regardless of what getOldID() returns.
 571          *
 572          * @return int Revision ID of last article revision
 573          */
 574         public function getRevIdFetched() {
 575                 if ( $this->fetchResult && $this->fetchResult->isOK() ) {
 576                         return $this->fetchResult->value->getId();
 577                 } else {
 578                         return $this->mPage->getLatest();
 579                 }
 580         }
 581
 582         /**
 583          * This is the default action of the index.php entry point: just view the
 584          * page of the given title.
 585          */
 586         public function view() {
 587                 global $wgUseFileCache, $wgDebugToolbar;
 588
 589                 # Get variables from query string
 590                 # As side effect this will load the revision and update the title
 591                 # in a revision ID is passed in the request, so this should remain
 592                 # the first call of this method even if $oldid is used way below.
 593                 $oldid = $this->getOldID();
 594
 595                 $user = $this->getContext()->getUser();
 596                 # Another whitelist check in case getOldID() is altering the title
 597                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 598                 if ( count( $permErrors ) ) {
 599                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 600                         throw new PermissionsError( 'read', $permErrors );
 601                 }
 602
 603                 $outputPage = $this->getContext()->getOutput();
 604                 # getOldID() may as well want us to redirect somewhere else
 605                 if ( $this->mRedirectUrl ) {
 606                         $outputPage->redirect( $this->mRedirectUrl );
 607                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 608
 609                         return;
 610                 }
 611
 612                 # If we got diff in the query, we want to see a diff page instead of the article.
 613                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 614                         wfDebug( __METHOD__ . ": showing diff page\n" );
 615                         $this->showDiffPage();
 616
 617                         return;
 618                 }
 619
 620                 # Set page title (may be overridden by DISPLAYTITLE)
 621                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 622
 623                 $outputPage->setArticleFlag( true );
 624                 # Allow frames by default
 625                 $outputPage->allowClickjacking();
 626
 627                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 628
 629                 $parserOptions = $this->getParserOptions();
 630                 $poOptions = [];
 631                 # Render printable version, use printable version cache
 632                 if ( $outputPage->isPrintable() ) {
 633                         $parserOptions->setIsPrintable( true );
 634                         $poOptions['enableSectionEditLinks'] = false;
 635                 } elseif ( $this->viewIsRenderAction
 636                         || !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user )
 637                 ) {
 638                         $poOptions['enableSectionEditLinks'] = false;
 639                 }
 640
 641                 # Try client and file cache
 642                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 643                         # Try to stream the output from file cache
 644                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 645                                 wfDebug( __METHOD__ . ": done file cache\n" );
 646                                 # tell wgOut that output is taken care of
 647                                 $outputPage->disable();
 648                                 $this->mPage->doViewUpdates( $user, $oldid );
 649
 650                                 return;
 651                         }
 652                 }
 653
 654                 # Should the parser cache be used?
 655                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 656                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 657                 if ( $user->getStubThreshold() ) {
 658                         MediaWikiServices::getInstance()->getStatsdDataFactory()->increment( 'pcache_miss_stub' );
 659                 }
 660
 661                 $this->showRedirectedFromHeader();
 662                 $this->showNamespaceHeader();
 663
 664                 # Iterate through the possible ways of constructing the output text.
 665                 # Keep going until $outputDone is set, or we run out of things to do.
 666                 $pass = 0;
 667                 $outputDone = false;
 668                 $this->mParserOutput = false;
 669
 670                 while ( !$outputDone && ++$pass ) {
 671                         switch ( $pass ) {
 672                                 case 1:
 673                                         // Avoid PHP 7.1 warning of passing $this by reference
 674                                         $articlePage = $this;
 675                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 676                                         break;
 677                                 case 2:
 678                                         # Early abort if the page doesn't exist
 679                                         if ( !$this->mPage->exists() ) {
 680                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 681                                                 $this->showMissingArticle();
 682                                                 $this->mPage->doViewUpdates( $user );
 683                                                 return;
 684                                         }
 685
 686                                         # Try the parser cache
 687                                         if ( $useParserCache ) {
 688                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 689
 690                                                 if ( $this->mParserOutput !== false ) {
 691                                                         if ( $oldid ) {
 692                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 693                                                                 $this->setOldSubtitle( $oldid );
 694                                                         } else {
 695                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 696                                                         }
 697                                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 698                                                         # Ensure that UI elements requiring revision ID have
 699                                                         # the correct version information.
 700                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 701                                                         # Preload timestamp to avoid a DB hit
 702                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 703                                                         if ( $cachedTimestamp !== null ) {
 704                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 705                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 706                                                         }
 707                                                         $outputDone = true;
 708                                                 }
 709                                         }
 710                                         break;
 711                                 case 3:
 712                                         # Are we looking at an old revision
 713                                         $rev = $this->fetchRevisionRecord();
 714                                         if ( $oldid && $this->fetchResult->isOK() ) {
 715                                                 $this->setOldSubtitle( $oldid );
 716
 717                                                 if ( !$this->showDeletedRevisionHeader() ) {
 718                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 719                                                         return;
 720                                                 }
 721                                         }
 722
 723                                         # Ensure that UI elements requiring revision ID have
 724                                         # the correct version information.
 725                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 726                                         # Preload timestamp to avoid a DB hit
 727                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 728
 729                                         # Pages containing custom CSS or JavaScript get special treatment
 730                                         if ( $this->getTitle()->isSiteConfigPage() || $this->getTitle()->isUserConfigPage() ) {
 731                                                 $dir = $this->getContext()->getLanguage()->getDir();
 732                                                 $lang = $this->getContext()->getLanguage()->getHtmlCode();
 733
 734                                                 $outputPage->wrapWikiMsg(
 735                                                         "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 736                                                         'clearyourcache'
 737                                                 );
 738                                         } elseif ( !Hooks::run( 'ArticleRevisionViewCustom', [
 739                                                         $rev,
 740                                                         $this->getTitle(),
 741                                                         $oldid,
 742                                                         $outputPage,
 743                                                 ] )
 744                                         ) {
 745                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 746                                                 // Allow extensions do their own custom view for certain pages
 747                                                 $outputDone = true;
 748                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 749                                                 [ $this->fetchContentObject(), $this->getTitle(), $outputPage ], '1.32' )
 750                                         ) {
 751                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 752                                                 // Allow extensions do their own custom view for certain pages
 753                                                 $outputDone = true;
 754                                         }
 755                                         break;
 756                                 case 4:
 757                                         # Run the parse, protected by a pool counter
 758                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 759
 760                                         $rev = $this->fetchRevisionRecord();
 761                                         $error = null;
 762
 763                                         if ( $rev ) {
 764                                                 $poolArticleView = new PoolWorkArticleView(
 765                                                         $this->getPage(),
 766                                                         $parserOptions,
 767                                                         $this->getRevIdFetched(),
 768                                                         $useParserCache,
 769                                                         $rev,
 770                                                         // permission checking was done earlier via showDeletedRevisionHeader()
 771                                                         RevisionRecord::RAW
 772                                                 );
 773                                                 $ok = $poolArticleView->execute();
 774                                                 $error = $poolArticleView->getError();
 775                                                 $this->mParserOutput = $poolArticleView->getParserOutput() ?: null;
 776
 777                                                 # Don't cache a dirty ParserOutput object
 778                                                 if ( $poolArticleView->getIsDirty() ) {
 779                                                         $outputPage->setCdnMaxage( 0 );
 780                                                         $outputPage->addHTML( "<!-- parser cache is expired, " .
 781                                                                 "sending anyway due to pool overload-->\n" );
 782                                                 }
 783                                         } else {
 784                                                 $ok = false;
 785                                         }
 786
 787                                         if ( !$ok ) {
 788                                                 if ( $error ) {
 789                                                         $outputPage->clearHTML(); // for release() errors
 790                                                         $outputPage->enableClientCache( false );
 791                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 792
 793                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 794                                                         $outputPage->wrapWikiTextAsInterface( 'errorbox', $errortext );
 795                                                 }
 796                                                 # Connection or timeout error
 797                                                 return;
 798                                         }
 799
 800                                         if ( $this->mParserOutput ) {
 801                                                 $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 802                                         }
 803
 804                                         if ( $rev && $this->getRevisionRedirectTarget( $rev ) ) {
 805                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 806                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 807                                         }
 808
 809                                         $outputDone = true;
 810                                         break;
 811                                 # Should be unreachable, but just in case...
 812                                 default:
 813                                         break 2;
 814                         }
 815                 }
 816
 817                 // Get the ParserOutput actually *displayed* here.
 818                 // Note that $this->mParserOutput is the *current*/oldid version output.
 819                 // Note that the ArticleViewHeader hook is allowed to set $outputDone to a
 820                 // ParserOutput instance.
 821                 $pOutput = ( $outputDone instanceof ParserOutput )
 822                         ? $outputDone // object fetched by hook
 823                         : ( $this->mParserOutput ?: null ); // ParserOutput or null, avoid false
 824
 825                 # Adjust title for main page & pages with displaytitle
 826                 if ( $pOutput ) {
 827                         $this->adjustDisplayTitle( $pOutput );
 828                 }
 829
 830                 # For the main page, overwrite the <title> element with the con-
 831                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 832                 # that's not empty).
 833                 # This message always exists because it is in the i18n files
 834                 if ( $this->getTitle()->isMainPage() ) {
 835                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 836                         if ( !$msg->isDisabled() ) {
 837                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 838                         }
 839                 }
 840
 841                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 842                 # This could use getTouched(), but that could be scary for major template edits.
 843                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 844
 845                 # Check for any __NOINDEX__ tags on the page using $pOutput
 846                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 847                 $outputPage->setIndexPolicy( $policy['index'] );
 848                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 849
 850                 $this->showViewFooter();
 851                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 852
 853                 # Load the postEdit module if the user just saved this revision
 854                 # See also EditPage::setPostEditCookie
 855                 $request = $this->getContext()->getRequest();
 856                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 857                 $postEdit = $request->getCookie( $cookieKey );
 858                 if ( $postEdit ) {
 859                         # Clear the cookie. This also prevents caching of the response.
 860                         $request->response()->clearCookie( $cookieKey );
 861                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 862                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 863                 }
 864         }
 865
 866         /**
 867          * @param RevisionRecord $revision
 868          * @return null|Title
 869          */
 870         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 871                 // TODO: find a *good* place for the code that determines the redirect target for
 872                 // a given revision!
 873                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 874                 $content = $revision->getContent( SlotRecord::MAIN );
 875                 return $content ? $content->getRedirectTarget() : null;
 876         }
 877
 878         /**
 879          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 880          * @param ParserOutput $pOutput
 881          */
 882         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 883                 $out = $this->getContext()->getOutput();
 884
 885                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 886                 $titleText = $pOutput->getTitleText();
 887                 if ( strval( $titleText ) !== '' ) {
 888                         $out->setPageTitle( $titleText );
 889                         $out->setDisplayTitle( $titleText );
 890                 }
 891         }
 892
 893         /**
 894          * Show a diff page according to current request variables. For use within
 895          * Article::view() only, other callers should use the DifferenceEngine class.
 896          */
 897         protected function showDiffPage() {
 898                 $request = $this->getContext()->getRequest();
 899                 $user = $this->getContext()->getUser();
 900                 $diff = $request->getVal( 'diff' );
 901                 $rcid = $request->getVal( 'rcid' );
 902                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 903                 $purge = $request->getVal( 'action' ) == 'purge';
 904                 $unhide = $request->getInt( 'unhide' ) == 1;
 905                 $oldid = $this->getOldID();
 906
 907                 $rev = $this->getRevisionFetched();
 908
 909                 if ( !$rev ) {
 910                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 911                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 912                                 ->params( $oldid )
 913                                 ->numParams( 1 )
 914                                 ->parseAsBlock();
 915                         $this->getContext()->getOutput()->addHTML( $msg );
 916                         return;
 917                 }
 918
 919                 $contentHandler = $rev->getContentHandler();
 920                 $de = $contentHandler->createDifferenceEngine(
 921                         $this->getContext(),
 922                         $oldid,
 923                         $diff,
 924                         $rcid,
 925                         $purge,
 926                         $unhide
 927                 );
 928
 929                 // DifferenceEngine directly fetched the revision:
 930                 $this->mRevIdFetched = $de->getNewid();
 931                 $de->showDiffPage( $diffOnly );
 932
 933                 // Run view updates for the newer revision being diffed (and shown
 934                 // below the diff if not $diffOnly).
 935                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 936                 // New can be false, convert it to 0 - this conveniently means the latest revision
 937                 $this->mPage->doViewUpdates( $user, (int)$new );
 938         }
 939
 940         /**
 941          * Get the robot policy to be used for the current view
 942          * @param string $action The action= GET parameter
 943          * @param ParserOutput|null $pOutput
 944          * @return array The policy that should be set
 945          * @todo actions other than 'view'
 946          */
 947         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 948                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 949
 950                 $ns = $this->getTitle()->getNamespace();
 951
 952                 # Don't index user and user talk pages for blocked users (T13443)
 953                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 954                         $specificTarget = null;
 955                         $vagueTarget = null;
 956                         $titleText = $this->getTitle()->getText();
 957                         if ( IP::isValid( $titleText ) ) {
 958                                 $vagueTarget = $titleText;
 959                         } else {
 960                                 $specificTarget = $titleText;
 961                         }
 962                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 963                                 return [
 964                                         'index' => 'noindex',
 965                                         'follow' => 'nofollow'
 966                                 ];
 967                         }
 968                 }
 969
 970                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 971                         # Non-articles (special pages etc), and old revisions
 972                         return [
 973                                 'index' => 'noindex',
 974                                 'follow' => 'nofollow'
 975                         ];
 976                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 977                         # Discourage indexing of printable versions, but encourage following
 978                         return [
 979                                 'index' => 'noindex',
 980                                 'follow' => 'follow'
 981                         ];
 982                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 983                         # For ?curid=x urls, disallow indexing
 984                         return [
 985                                 'index' => 'noindex',
 986                                 'follow' => 'follow'
 987                         ];
 988                 }
 989
 990                 # Otherwise, construct the policy based on the various config variables.
 991                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 992
 993                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 994                         # Honour customised robot policies for this namespace
 995                         $policy = array_merge(
 996                                 $policy,
 997                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 998                         );
 999                 }
1000                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1001                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1002                         # a final sanity check that we have really got the parser output.
1003                         $policy = array_merge(
1004                                 $policy,
1005                                 [ 'index' => $pOutput->getIndexPolicy() ]
1006                         );
1007                 }
1008
1009                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1010                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1011                         $policy = array_merge(
1012                                 $policy,
1013                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1014                         );
1015                 }
1016
1017                 return $policy;
1018         }
1019
1020         /**
1021          * Converts a String robot policy into an associative array, to allow
1022          * merging of several policies using array_merge().
1023          * @param array|string $policy Returns empty array on null/false/'', transparent
1024          *   to already-converted arrays, converts string.
1025          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1026          */
1027         public static function formatRobotPolicy( $policy ) {
1028                 if ( is_array( $policy ) ) {
1029                         return $policy;
1030                 } elseif ( !$policy ) {
1031                         return [];
1032                 }
1033
1034                 $policy = explode( ',', $policy );
1035                 $policy = array_map( 'trim', $policy );
1036
1037                 $arr = [];
1038                 foreach ( $policy as $var ) {
1039                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1040                                 $arr['index'] = $var;
1041                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1042                                 $arr['follow'] = $var;
1043                         }
1044                 }
1045
1046                 return $arr;
1047         }
1048
1049         /**
1050          * If this request is a redirect view, send "redirected from" subtitle to
1051          * the output. Returns true if the header was needed, false if this is not
1052          * a redirect view. Handles both local and remote redirects.
1053          *
1054          * @return bool
1055          */
1056         public function showRedirectedFromHeader() {
1057                 global $wgRedirectSources;
1058
1059                 $context = $this->getContext();
1060                 $outputPage = $context->getOutput();
1061                 $request = $context->getRequest();
1062                 $rdfrom = $request->getVal( 'rdfrom' );
1063
1064                 // Construct a URL for the current page view, but with the target title
1065                 $query = $request->getValues();
1066                 unset( $query['rdfrom'] );
1067                 unset( $query['title'] );
1068                 if ( $this->getTitle()->isRedirect() ) {
1069                         // Prevent double redirects
1070                         $query['redirect'] = 'no';
1071                 }
1072                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1073
1074                 if ( isset( $this->mRedirectedFrom ) ) {
1075                         // Avoid PHP 7.1 warning of passing $this by reference
1076                         $articlePage = $this;
1077
1078                         // This is an internally redirected page view.
1079                         // We'll need a backlink to the source page for navigation.
1080                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1081                                 $redir = Linker::linkKnown(
1082                                         $this->mRedirectedFrom,
1083                                         null,
1084                                         [],
1085                                         [ 'redirect' => 'no' ]
1086                                 );
1087
1088                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1089                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1090                                 . "</span>" );
1091
1092                                 // Add the script to update the displayed URL and
1093                                 // set the fragment if one was specified in the redirect
1094                                 $outputPage->addJsConfigVars( [
1095                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1096                                 ] );
1097                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1098
1099                                 // Add a <link rel="canonical"> tag
1100                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1101
1102                                 // Tell the output object that the user arrived at this article through a redirect
1103                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1104
1105                                 return true;
1106                         }
1107                 } elseif ( $rdfrom ) {
1108                         // This is an externally redirected view, from some other wiki.
1109                         // If it was reported from a trusted site, supply a backlink.
1110                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1111                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1112                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1113                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1114                                 . "</span>" );
1115
1116                                 // Add the script to update the displayed URL
1117                                 $outputPage->addJsConfigVars( [
1118                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1119                                 ] );
1120                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1121
1122                                 return true;
1123                         }
1124                 }
1125
1126                 return false;
1127         }
1128
1129         /**
1130          * Show a header specific to the namespace currently being viewed, like
1131          * [[MediaWiki:Talkpagetext]]. For Article::view().
1132          */
1133         public function showNamespaceHeader() {
1134                 if ( $this->getTitle()->isTalkPage() && !wfMessage( 'talkpageheader' )->isDisabled() ) {
1135                         $this->getContext()->getOutput()->wrapWikiMsg(
1136                                 "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1137                                 [ 'talkpageheader' ]
1138                         );
1139                 }
1140         }
1141
1142         /**
1143          * Show the footer section of an ordinary page view
1144          */
1145         public function showViewFooter() {
1146                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1147                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1148                         && IP::isValid( $this->getTitle()->getText() )
1149                 ) {
1150                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1151                 }
1152
1153                 // Show a footer allowing the user to patrol the shown revision or page if possible
1154                 $patrolFooterShown = $this->showPatrolFooter();
1155
1156                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1157         }
1158
1159         /**
1160          * If patrol is possible, output a patrol UI box. This is called from the
1161          * footer section of ordinary page views. If patrol is not possible or not
1162          * desired, does nothing.
1163          * Side effect: When the patrol link is build, this method will call
1164          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1165          *
1166          * @return bool
1167          */
1168         public function showPatrolFooter() {
1169                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1170
1171                 // Allow hooks to decide whether to not output this at all
1172                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1173                         return false;
1174                 }
1175
1176                 $outputPage = $this->getContext()->getOutput();
1177                 $user = $this->getContext()->getUser();
1178                 $title = $this->getTitle();
1179                 $rc = false;
1180
1181                 if ( !$title->quickUserCan( 'patrol', $user )
1182                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1183                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1184                 ) {
1185                         // Patrolling is disabled or the user isn't allowed to
1186                         return false;
1187                 }
1188
1189                 if ( $this->mRevision
1190                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1191                 ) {
1192                         // The current revision is already older than what could be in the RC table
1193                         // 6h tolerance because the RC might not be cleaned out regularly
1194                         return false;
1195                 }
1196
1197                 // Check for cached results
1198                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1199                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1200                 if ( $cache->get( $key ) ) {
1201                         return false;
1202                 }
1203
1204                 $dbr = wfGetDB( DB_REPLICA );
1205                 $oldestRevisionTimestamp = $dbr->selectField(
1206                         'revision',
1207                         'MIN( rev_timestamp )',
1208                         [ 'rev_page' => $title->getArticleID() ],
1209                         __METHOD__
1210                 );
1211
1212                 // New page patrol: Get the timestamp of the oldest revison which
1213                 // the revision table holds for the given page. Then we look
1214                 // whether it's within the RC lifespan and if it is, we try
1215                 // to get the recentchanges row belonging to that entry
1216                 // (with rc_new = 1).
1217                 $recentPageCreation = false;
1218                 if ( $oldestRevisionTimestamp
1219                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1220                 ) {
1221                         // 6h tolerance because the RC might not be cleaned out regularly
1222                         $recentPageCreation = true;
1223                         $rc = RecentChange::newFromConds(
1224                                 [
1225                                         'rc_new' => 1,
1226                                         'rc_timestamp' => $oldestRevisionTimestamp,
1227                                         'rc_namespace' => $title->getNamespace(),
1228                                         'rc_cur_id' => $title->getArticleID()
1229                                 ],
1230                                 __METHOD__
1231                         );
1232                         if ( $rc ) {
1233                                 // Use generic patrol message for new pages
1234                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1235                         }
1236                 }
1237
1238                 // File patrol: Get the timestamp of the latest upload for this page,
1239                 // check whether it is within the RC lifespan and if it is, we try
1240                 // to get the recentchanges row belonging to that entry
1241                 // (with rc_type = RC_LOG, rc_log_type = upload).
1242                 $recentFileUpload = false;
1243                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1244                         && $title->getNamespace() === NS_FILE ) {
1245                         // Retrieve timestamp of most recent upload
1246                         $newestUploadTimestamp = $dbr->selectField(
1247                                 'image',
1248                                 'MAX( img_timestamp )',
1249                                 [ 'img_name' => $title->getDBkey() ],
1250                                 __METHOD__
1251                         );
1252                         if ( $newestUploadTimestamp
1253                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1254                         ) {
1255                                 // 6h tolerance because the RC might not be cleaned out regularly
1256                                 $recentFileUpload = true;
1257                                 $rc = RecentChange::newFromConds(
1258                                         [
1259                                                 'rc_type' => RC_LOG,
1260                                                 'rc_log_type' => 'upload',
1261                                                 'rc_timestamp' => $newestUploadTimestamp,
1262                                                 'rc_namespace' => NS_FILE,
1263                                                 'rc_cur_id' => $title->getArticleID()
1264                                         ],
1265                                         __METHOD__
1266                                 );
1267                                 if ( $rc ) {
1268                                         // Use patrol message specific to files
1269                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1270                                 }
1271                         }
1272                 }
1273
1274                 if ( !$recentPageCreation && !$recentFileUpload ) {
1275                         // Page creation and latest upload (for files) is too old to be in RC
1276
1277                         // We definitely can't patrol so cache the information
1278                         // When a new file version is uploaded, the cache is cleared
1279                         $cache->set( $key, '1' );
1280
1281                         return false;
1282                 }
1283
1284                 if ( !$rc ) {
1285                         // Don't cache: This can be hit if the page gets accessed very fast after
1286                         // its creation / latest upload or in case we have high replica DB lag. In case
1287                         // the revision is too old, we will already return above.
1288                         return false;
1289                 }
1290
1291                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1292                         // Patrolled RC entry around
1293
1294                         // Cache the information we gathered above in case we can't patrol
1295                         // Don't cache in case we can patrol as this could change
1296                         $cache->set( $key, '1' );
1297
1298                         return false;
1299                 }
1300
1301                 if ( $rc->getPerformer()->equals( $user ) ) {
1302                         // Don't show a patrol link for own creations/uploads. If the user could
1303                         // patrol them, they already would be patrolled
1304                         return false;
1305                 }
1306
1307                 $outputPage->preventClickjacking();
1308                 if ( $user->isAllowed( 'writeapi' ) ) {
1309                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1310                 }
1311
1312                 $link = Linker::linkKnown(
1313                         $title,
1314                         $markPatrolledMsg->escaped(),
1315                         [],
1316                         [
1317                                 'action' => 'markpatrolled',
1318                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1319                         ]
1320                 );
1321
1322                 $outputPage->addHTML(
1323                         "<div class='patrollink' data-mw='interface'>" .
1324                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1325                         '</div>'
1326                 );
1327
1328                 return true;
1329         }
1330
1331         /**
1332          * Purge the cache used to check if it is worth showing the patrol footer
1333          * For example, it is done during re-uploads when file patrol is used.
1334          * @param int $articleID ID of the article to purge
1335          * @since 1.27
1336          */
1337         public static function purgePatrolFooterCache( $articleID ) {
1338                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1339                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1340         }
1341
1342         /**
1343          * Show the error text for a missing article. For articles in the MediaWiki
1344          * namespace, show the default message text. To be called from Article::view().
1345          */
1346         public function showMissingArticle() {
1347                 global $wgSend404Code;
1348
1349                 $outputPage = $this->getContext()->getOutput();
1350                 // Whether the page is a root user page of an existing user (but not a subpage)
1351                 $validUserPage = false;
1352
1353                 $title = $this->getTitle();
1354
1355                 $services = MediaWikiServices::getInstance();
1356
1357                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1358                 if ( $title->getNamespace() == NS_USER
1359                         || $title->getNamespace() == NS_USER_TALK
1360                 ) {
1361                         $rootPart = explode( '/', $title->getText() )[0];
1362                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1363                         $ip = User::isIP( $rootPart );
1364                         $block = Block::newFromTarget( $user, $user );
1365
1366                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1367                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1368                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1369                         } elseif (
1370                                 !is_null( $block ) &&
1371                                 $block->getType() != Block::TYPE_AUTO &&
1372                                 ( $block->isSitewide() || $user->isBlockedFrom( $title ) )
1373                         ) {
1374                                 // Show log extract if the user is sitewide blocked or is partially
1375                                 // blocked and not allowed to edit their user page or user talk page
1376                                 LogEventsList::showLogExtract(
1377                                         $outputPage,
1378                                         'block',
1379                                         $services->getNamespaceInfo()->getCanonicalName( NS_USER ) . ':' .
1380                                                 $block->getTarget(),
1381                                         '',
1382                                         [
1383                                                 'lim' => 1,
1384                                                 'showIfEmpty' => false,
1385                                                 'msgKey' => [
1386                                                         'blocked-notice-logextract',
1387                                                         $user->getName() # Support GENDER in notice
1388                                                 ]
1389                                         ]
1390                                 );
1391                                 $validUserPage = !$title->isSubpage();
1392                         } else {
1393                                 $validUserPage = !$title->isSubpage();
1394                         }
1395                 }
1396
1397                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1398
1399                 # Show delete and move logs if there were any such events.
1400                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1401                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1402                 $cache = $services->getMainObjectStash();
1403                 $key = $cache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1404                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1405                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1406                 if ( $loggedIn || $cache->get( $key ) || $sessionExists ) {
1407                         $logTypes = [ 'delete', 'move', 'protect' ];
1408
1409                         $dbr = wfGetDB( DB_REPLICA );
1410
1411                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1412                         // Give extensions a chance to hide their (unrelated) log entries
1413                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1414                         LogEventsList::showLogExtract(
1415                                 $outputPage,
1416                                 $logTypes,
1417                                 $title,
1418                                 '',
1419                                 [
1420                                         'lim' => 10,
1421                                         'conds' => $conds,
1422                                         'showIfEmpty' => false,
1423                                         'msgKey' => [ $loggedIn || $sessionExists
1424                                                 ? 'moveddeleted-notice'
1425                                                 : 'moveddeleted-notice-recent'
1426                                         ]
1427                                 ]
1428                         );
1429                 }
1430
1431                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1432                         // If there's no backing content, send a 404 Not Found
1433                         // for better machine handling of broken links.
1434                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1435                 }
1436
1437                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1438                 $policy = $this->getRobotPolicy( 'view' );
1439                 $outputPage->setIndexPolicy( $policy['index'] );
1440                 $outputPage->setFollowPolicy( $policy['follow'] );
1441
1442                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1443
1444                 if ( !$hookResult ) {
1445                         return;
1446                 }
1447
1448                 # Show error message
1449                 $oldid = $this->getOldID();
1450                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1451                         // use fake Content object for system message
1452                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1453                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1454                 } else {
1455                         if ( $oldid ) {
1456                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1457                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1458                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1459                         ) {
1460                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1461                                 $text = wfMessage( $message )->plain();
1462                         } else {
1463                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1464                         }
1465
1466                         $dir = $this->getContext()->getLanguage()->getDir();
1467                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1468                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1469                                 'class' => "noarticletext mw-content-$dir",
1470                                 'dir' => $dir,
1471                                 'lang' => $lang,
1472                         ] ) . "\n$text\n</div>" );
1473                 }
1474         }
1475
1476         /**
1477          * If the revision requested for view is deleted, check permissions.
1478          * Send either an error message or a warning header to the output.
1479          *
1480          * @return bool True if the view is allowed, false if not.
1481          */
1482         public function showDeletedRevisionHeader() {
1483                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1484                         // Not deleted
1485                         return true;
1486                 }
1487
1488                 $outputPage = $this->getContext()->getOutput();
1489                 $user = $this->getContext()->getUser();
1490                 // If the user is not allowed to see it...
1491                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1492                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1493                                 'rev-deleted-text-permission' );
1494
1495                         return false;
1496                 // If the user needs to confirm that they want to see it...
1497                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1498                         # Give explanation and add a link to view the revision...
1499                         $oldid = intval( $this->getOldID() );
1500                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1501                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1502                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1503                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1504                                 [ $msg, $link ] );
1505
1506                         return false;
1507                 // We are allowed to see...
1508                 } else {
1509                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1510                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1511                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1512
1513                         return true;
1514                 }
1515         }
1516
1517         /**
1518          * Generate the navigation links when browsing through an article revisions
1519          * It shows the information as:
1520          *   Revision as of \<date\>; view current revision
1521          *   \<- Previous version | Next Version -\>
1522          *
1523          * @param int $oldid Revision ID of this article revision
1524          */
1525         public function setOldSubtitle( $oldid = 0 ) {
1526                 // Avoid PHP 7.1 warning of passing $this by reference
1527                 $articlePage = $this;
1528
1529                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1530                         return;
1531                 }
1532
1533                 $context = $this->getContext();
1534                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1535
1536                 # Cascade unhide param in links for easy deletion browsing
1537                 $extraParams = [];
1538                 if ( $unhide ) {
1539                         $extraParams['unhide'] = 1;
1540                 }
1541
1542                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1543                         $revision = $this->mRevision;
1544                 } else {
1545                         $revision = Revision::newFromId( $oldid );
1546                 }
1547
1548                 $timestamp = $revision->getTimestamp();
1549
1550                 $current = ( $oldid == $this->mPage->getLatest() );
1551                 $language = $context->getLanguage();
1552                 $user = $context->getUser();
1553
1554                 $td = $language->userTimeAndDate( $timestamp, $user );
1555                 $tddate = $language->userDate( $timestamp, $user );
1556                 $tdtime = $language->userTime( $timestamp, $user );
1557
1558                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1559                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1560
1561                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1562                         ? 'revision-info-current'
1563                         : 'revision-info';
1564
1565                 $outputPage = $context->getOutput();
1566                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1567                         $context->msg( $infomsg, $td )
1568                                 ->rawParams( $userlinks )
1569                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1570                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1571                                 ->parse() .
1572                         "</div>";
1573
1574                 $lnk = $current
1575                         ? $context->msg( 'currentrevisionlink' )->escaped()
1576                         : Linker::linkKnown(
1577                                 $this->getTitle(),
1578                                 $context->msg( 'currentrevisionlink' )->escaped(),
1579                                 [],
1580                                 $extraParams
1581                         );
1582                 $curdiff = $current
1583                         ? $context->msg( 'diff' )->escaped()
1584                         : Linker::linkKnown(
1585                                 $this->getTitle(),
1586                                 $context->msg( 'diff' )->escaped(),
1587                                 [],
1588                                 [
1589                                         'diff' => 'cur',
1590                                         'oldid' => $oldid
1591                                 ] + $extraParams
1592                         );
1593                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1594                 $prevlink = $prev
1595                         ? Linker::linkKnown(
1596                                 $this->getTitle(),
1597                                 $context->msg( 'previousrevision' )->escaped(),
1598                                 [],
1599                                 [
1600                                         'direction' => 'prev',
1601                                         'oldid' => $oldid
1602                                 ] + $extraParams
1603                         )
1604                         : $context->msg( 'previousrevision' )->escaped();
1605                 $prevdiff = $prev
1606                         ? Linker::linkKnown(
1607                                 $this->getTitle(),
1608                                 $context->msg( 'diff' )->escaped(),
1609                                 [],
1610                                 [
1611                                         'diff' => 'prev',
1612                                         'oldid' => $oldid
1613                                 ] + $extraParams
1614                         )
1615                         : $context->msg( 'diff' )->escaped();
1616                 $nextlink = $current
1617                         ? $context->msg( 'nextrevision' )->escaped()
1618                         : Linker::linkKnown(
1619                                 $this->getTitle(),
1620                                 $context->msg( 'nextrevision' )->escaped(),
1621                                 [],
1622                                 [
1623                                         'direction' => 'next',
1624                                         'oldid' => $oldid
1625                                 ] + $extraParams
1626                         );
1627                 $nextdiff = $current
1628                         ? $context->msg( 'diff' )->escaped()
1629                         : Linker::linkKnown(
1630                                 $this->getTitle(),
1631                                 $context->msg( 'diff' )->escaped(),
1632                                 [],
1633                                 [
1634                                         'diff' => 'next',
1635                                         'oldid' => $oldid
1636                                 ] + $extraParams
1637                         );
1638
1639                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1640                 if ( $cdel !== '' ) {
1641                         $cdel .= ' ';
1642                 }
1643
1644                 // the outer div is need for styling the revision info and nav in MobileFrontend
1645                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1646                         "<div id=\"mw-revision-nav\">" . $cdel .
1647                         $context->msg( 'revision-nav' )->rawParams(
1648                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1649                         )->escaped() . "</div></div>" );
1650         }
1651
1652         /**
1653          * Return the HTML for the top of a redirect page
1654          *
1655          * Chances are you should just be using the ParserOutput from
1656          * WikitextContent::getParserOutput instead of calling this for redirects.
1657          *
1658          * @param Title|array $target Destination(s) to redirect
1659          * @param bool $appendSubtitle [optional]
1660          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1661          * @return string Containing HTML with redirect link
1662          *
1663          * @deprecated since 1.30
1664          */
1665         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1666                 $lang = $this->getTitle()->getPageLanguage();
1667                 $out = $this->getContext()->getOutput();
1668                 if ( $appendSubtitle ) {
1669                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1670                 }
1671                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1672                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1673         }
1674
1675         /**
1676          * Return the HTML for the top of a redirect page
1677          *
1678          * Chances are you should just be using the ParserOutput from
1679          * WikitextContent::getParserOutput instead of calling this for redirects.
1680          *
1681          * @since 1.23
1682          * @param Language $lang
1683          * @param Title|array $target Destination(s) to redirect
1684          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1685          * @return string Containing HTML with redirect link
1686          */
1687         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1688                 if ( !is_array( $target ) ) {
1689                         $target = [ $target ];
1690                 }
1691
1692                 $html = '<ul class="redirectText">';
1693                 /** @var Title $title */
1694                 foreach ( $target as $title ) {
1695                         $html .= '<li>' . Linker::link(
1696                                 $title,
1697                                 htmlspecialchars( $title->getFullText() ),
1698                                 [],
1699                                 // Make sure wiki page redirects are not followed
1700                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1701                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1702                         ) . '</li>';
1703                 }
1704                 $html .= '</ul>';
1705
1706                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1707
1708                 return '<div class="redirectMsg">' .
1709                         '<p>' . $redirectToText . '</p>' .
1710                         $html .
1711                         '</div>';
1712         }
1713
1714         /**
1715          * Adds help link with an icon via page indicators.
1716          * Link target can be overridden by a local message containing a wikilink:
1717          * the message key is: 'namespace-' + namespace number + '-helppage'.
1718          * @param string $to Target MediaWiki.org page title or encoded URL.
1719          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1720          * @since 1.25
1721          */
1722         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1723                 $msg = wfMessage(
1724                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1725                 );
1726
1727                 $out = $this->getContext()->getOutput();
1728                 if ( !$msg->isDisabled() ) {
1729                         $helpUrl = Skin::makeUrl( $msg->plain() );
1730                         $out->addHelpLink( $helpUrl, true );
1731                 } else {
1732                         $out->addHelpLink( $to, $overrideBaseUrl );
1733                 }
1734         }
1735
1736         /**
1737          * Handle action=render
1738          */
1739         public function render() {
1740                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1741                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1742                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1743                 $this->viewIsRenderAction = true;
1744                 $this->view();
1745         }
1746
1747         /**
1748          * action=protect handler
1749          */
1750         public function protect() {
1751                 $form = new ProtectionForm( $this );
1752                 $form->execute();
1753         }
1754
1755         /**
1756          * action=unprotect handler (alias)
1757          */
1758         public function unprotect() {
1759                 $this->protect();
1760         }
1761
1762         /**
1763          * UI entry point for page deletion
1764          */
1765         public function delete() {
1766                 # This code desperately needs to be totally rewritten
1767
1768                 $title = $this->getTitle();
1769                 $context = $this->getContext();
1770                 $user = $context->getUser();
1771                 $request = $context->getRequest();
1772
1773                 # Check permissions
1774                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1775                 if ( count( $permissionErrors ) ) {
1776                         throw new PermissionsError( 'delete', $permissionErrors );
1777                 }
1778
1779                 # Read-only check...
1780                 if ( wfReadOnly() ) {
1781                         throw new ReadOnlyError;
1782                 }
1783
1784                 # Better double-check that it hasn't been deleted yet!
1785                 $this->mPage->loadPageData(
1786                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1787                 );
1788                 if ( !$this->mPage->exists() ) {
1789                         $deleteLogPage = new LogPage( 'delete' );
1790                         $outputPage = $context->getOutput();
1791                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1792                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1793                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1794                                 );
1795                         $outputPage->addHTML(
1796                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1797                         );
1798                         LogEventsList::showLogExtract(
1799                                 $outputPage,
1800                                 'delete',
1801                                 $title
1802                         );
1803
1804                         return;
1805                 }
1806
1807                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1808                 $deleteReason = $request->getText( 'wpReason' );
1809
1810                 if ( $deleteReasonList == 'other' ) {
1811                         $reason = $deleteReason;
1812                 } elseif ( $deleteReason != '' ) {
1813                         // Entry from drop down menu + additional comment
1814                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1815                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1816                 } else {
1817                         $reason = $deleteReasonList;
1818                 }
1819
1820                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1821                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1822                 ) {
1823                         # Flag to hide all contents of the archived revisions
1824                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1825
1826                         $this->doDelete( $reason, $suppress );
1827
1828                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1829
1830                         return;
1831                 }
1832
1833                 // Generate deletion reason
1834                 $hasHistory = false;
1835                 if ( !$reason ) {
1836                         try {
1837                                 $reason = $this->generateReason( $hasHistory );
1838                         } catch ( Exception $e ) {
1839                                 # if a page is horribly broken, we still want to be able to
1840                                 # delete it. So be lenient about errors here.
1841                                 wfDebug( "Error while building auto delete summary: $e" );
1842                                 $reason = '';
1843                         }
1844                 }
1845
1846                 // If the page has a history, insert a warning
1847                 if ( $hasHistory ) {
1848                         $title = $this->getTitle();
1849
1850                         // The following can use the real revision count as this is only being shown for users
1851                         // that can delete this page.
1852                         // This, as a side-effect, also makes sure that the following query isn't being run for
1853                         // pages with a larger history, unless the user has the 'bigdelete' right
1854                         // (and is about to delete this page).
1855                         $dbr = wfGetDB( DB_REPLICA );
1856                         $revisions = $edits = (int)$dbr->selectField(
1857                                 'revision',
1858                                 'COUNT(rev_page)',
1859                                 [ 'rev_page' => $title->getArticleID() ],
1860                                 __METHOD__
1861                         );
1862
1863                         // @todo i18n issue/patchwork message
1864                         $context->getOutput()->addHTML(
1865                                 '<strong class="mw-delete-warning-revisions">' .
1866                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1867                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1868                                         $context->msg( 'history' )->escaped(),
1869                                         [],
1870                                         [ 'action' => 'history' ] ) .
1871                                 '</strong>'
1872                         );
1873
1874                         if ( $title->isBigDeletion() ) {
1875                                 global $wgDeleteRevisionsLimit;
1876                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1877                                         [
1878                                                 'delete-warning-toobig',
1879                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1880                                         ]
1881                                 );
1882                         }
1883                 }
1884
1885                 $this->confirmDelete( $reason );
1886         }
1887
1888         /**
1889          * Output deletion confirmation dialog
1890          * @todo Move to another file?
1891          * @param string $reason Prefilled reason
1892          */
1893         public function confirmDelete( $reason ) {
1894                 wfDebug( "Article::confirmDelete\n" );
1895
1896                 $title = $this->getTitle();
1897                 $ctx = $this->getContext();
1898                 $outputPage = $ctx->getOutput();
1899                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1900                 $outputPage->addBacklinkSubtitle( $title );
1901                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1902                 $outputPage->addModules( 'mediawiki.action.delete' );
1903
1904                 $backlinkCache = $title->getBacklinkCache();
1905                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1906                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1907                                 'deleting-backlinks-warning' );
1908                 }
1909
1910                 $subpageQueryLimit = 51;
1911                 $subpages = $title->getSubpages( $subpageQueryLimit );
1912                 $subpageCount = count( $subpages );
1913                 if ( $subpageCount > 0 ) {
1914                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1915                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1916                 }
1917                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1918
1919                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1920
1921                 $user = $this->getContext()->getUser();
1922                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1923
1924                 $outputPage->enableOOUI();
1925
1926                 $options = Xml::listDropDownOptions(
1927                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1928                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1929                 );
1930                 $options = Xml::listDropDownOptionsOoui( $options );
1931
1932                 $fields[] = new OOUI\FieldLayout(
1933                         new OOUI\DropdownInputWidget( [
1934                                 'name' => 'wpDeleteReasonList',
1935                                 'inputId' => 'wpDeleteReasonList',
1936                                 'tabIndex' => 1,
1937                                 'infusable' => true,
1938                                 'value' => '',
1939                                 'options' => $options
1940                         ] ),
1941                         [
1942                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1943                                 'align' => 'top',
1944                         ]
1945                 );
1946
1947                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1948                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1949                 // Unicode codepoints.
1950                 $fields[] = new OOUI\FieldLayout(
1951                         new OOUI\TextInputWidget( [
1952                                 'name' => 'wpReason',
1953                                 'inputId' => 'wpReason',
1954                                 'tabIndex' => 2,
1955                                 'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
1956                                 'infusable' => true,
1957                                 'value' => $reason,
1958                                 'autofocus' => true,
1959                         ] ),
1960                         [
1961                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1962                                 'align' => 'top',
1963                         ]
1964                 );
1965
1966                 if ( $user->isLoggedIn() ) {
1967                         $fields[] = new OOUI\FieldLayout(
1968                                 new OOUI\CheckboxInputWidget( [
1969                                         'name' => 'wpWatch',
1970                                         'inputId' => 'wpWatch',
1971                                         'tabIndex' => 3,
1972                                         'selected' => $checkWatch,
1973                                 ] ),
1974                                 [
1975                                         'label' => $ctx->msg( 'watchthis' )->text(),
1976                                         'align' => 'inline',
1977                                         'infusable' => true,
1978                                 ]
1979                         );
1980                 }
1981
1982                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1983                         $fields[] = new OOUI\FieldLayout(
1984                                 new OOUI\CheckboxInputWidget( [
1985                                         'name' => 'wpSuppress',
1986                                         'inputId' => 'wpSuppress',
1987                                         'tabIndex' => 4,
1988                                 ] ),
1989                                 [
1990                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1991                                         'align' => 'inline',
1992                                         'infusable' => true,
1993                                 ]
1994                         );
1995                 }
1996
1997                 $fields[] = new OOUI\FieldLayout(
1998                         new OOUI\ButtonInputWidget( [
1999                                 'name' => 'wpConfirmB',
2000                                 'inputId' => 'wpConfirmB',
2001                                 'tabIndex' => 5,
2002                                 'value' => $ctx->msg( 'deletepage' )->text(),
2003                                 'label' => $ctx->msg( 'deletepage' )->text(),
2004                                 'flags' => [ 'primary', 'destructive' ],
2005                                 'type' => 'submit',
2006                         ] ),
2007                         [
2008                                 'align' => 'top',
2009                         ]
2010                 );
2011
2012                 $fieldset = new OOUI\FieldsetLayout( [
2013                         'label' => $ctx->msg( 'delete-legend' )->text(),
2014                         'id' => 'mw-delete-table',
2015                         'items' => $fields,
2016                 ] );
2017
2018                 $form = new OOUI\FormLayout( [
2019                         'method' => 'post',
2020                         'action' => $title->getLocalURL( 'action=delete' ),
2021                         'id' => 'deleteconfirm',
2022                 ] );
2023                 $form->appendContent(
2024                         $fieldset,
2025                         new OOUI\HtmlSnippet(
2026                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2027                         )
2028                 );
2029
2030                 $outputPage->addHTML(
2031                         new OOUI\PanelLayout( [
2032                                 'classes' => [ 'deletepage-wrapper' ],
2033                                 'expanded' => false,
2034                                 'padded' => true,
2035                                 'framed' => true,
2036                                 'content' => $form,
2037                         ] )
2038                 );
2039
2040                 if ( $user->isAllowed( 'editinterface' ) ) {
2041                         $link = Linker::linkKnown(
2042                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2043                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2044                                 [],
2045                                 [ 'action' => 'edit' ]
2046                         );
2047                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2048                 }
2049
2050                 $deleteLogPage = new LogPage( 'delete' );
2051                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2052                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2053         }
2054
2055         /**
2056          * Perform a deletion and output success or failure messages
2057          * @param string $reason
2058          * @param bool $suppress
2059          * @param bool $immediate false allows deleting over time via the job queue
2060          * @throws FatalError
2061          * @throws MWException
2062          */
2063         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2064                 $error = '';
2065                 $context = $this->getContext();
2066                 $outputPage = $context->getOutput();
2067                 $user = $context->getUser();
2068                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2069                         [], 'delete', $immediate );
2070
2071                 if ( $status->isOK() ) {
2072                         $deleted = $this->getTitle()->getPrefixedText();
2073
2074                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2075                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2076
2077                         if ( $status->isGood() ) {
2078                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2079                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2080                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2081                         } else {
2082                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2083                         }
2084
2085                         $outputPage->returnToMain( false );
2086                 } else {
2087                         $outputPage->setPageTitle(
2088                                 wfMessage( 'cannotdelete-title',
2089                                         $this->getTitle()->getPrefixedText() )
2090                         );
2091
2092                         if ( $error == '' ) {
2093                                 $outputPage->wrapWikiTextAsInterface(
2094                                         'error mw-error-cannotdelete',
2095                                         $status->getWikiText()
2096                                 );
2097                                 $deleteLogPage = new LogPage( 'delete' );
2098                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2099
2100                                 LogEventsList::showLogExtract(
2101                                         $outputPage,
2102                                         'delete',
2103                                         $this->getTitle()
2104                                 );
2105                         } else {
2106                                 $outputPage->addHTML( $error );
2107                         }
2108                 }
2109         }
2110
2111         /* Caching functions */
2112
2113         /**
2114          * checkLastModified returns true if it has taken care of all
2115          * output to the client that is necessary for this request.
2116          * (that is, it has sent a cached version of the page)
2117          *
2118          * @return bool True if cached version send, false otherwise
2119          */
2120         protected function tryFileCache() {
2121                 static $called = false;
2122
2123                 if ( $called ) {
2124                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2125                         return false;
2126                 }
2127
2128                 $called = true;
2129                 if ( $this->isFileCacheable() ) {
2130                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2131                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2132                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2133                                 $cache->loadFromFileCache( $this->getContext() );
2134                                 return true;
2135                         } else {
2136                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2137                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2138                         }
2139                 } else {
2140                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2141                 }
2142
2143                 return false;
2144         }
2145
2146         /**
2147          * Check if the page can be cached
2148          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2149          * @return bool
2150          */
2151         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2152                 $cacheable = false;
2153
2154                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2155                         $cacheable = $this->mPage->getId()
2156                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2157                         // Extension may have reason to disable file caching on some pages.
2158                         if ( $cacheable ) {
2159                                 // Avoid PHP 7.1 warning of passing $this by reference
2160                                 $articlePage = $this;
2161                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2162                         }
2163                 }
2164
2165                 return $cacheable;
2166         }
2167
2168         /**#@-*/
2169
2170         /**
2171          * Lightweight method to get the parser output for a page, checking the parser cache
2172          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2173          * consider, so it's not appropriate to use there.
2174          *
2175          * @since 1.16 (r52326) for LiquidThreads
2176          *
2177          * @param int|null $oldid Revision ID or null
2178          * @param User|null $user The relevant user
2179          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2180          */
2181         public function getParserOutput( $oldid = null, User $user = null ) {
2182                 // XXX: bypasses mParserOptions and thus setParserOptions()
2183
2184                 if ( $user === null ) {
2185                         $parserOptions = $this->getParserOptions();
2186                 } else {
2187                         $parserOptions = $this->mPage->makeParserOptions( $user );
2188                 }
2189
2190                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2191         }
2192
2193         /**
2194          * Override the ParserOptions used to render the primary article wikitext.
2195          *
2196          * @param ParserOptions $options
2197          * @throws MWException If the parser options where already initialized.
2198          */
2199         public function setParserOptions( ParserOptions $options ) {
2200                 if ( $this->mParserOptions ) {
2201                         throw new MWException( "can't change parser options after they have already been set" );
2202                 }
2203
2204                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2205                 $this->mParserOptions = clone $options;
2206         }
2207
2208         /**
2209          * Get parser options suitable for rendering the primary article wikitext
2210          * @return ParserOptions
2211          */
2212         public function getParserOptions() {
2213                 if ( !$this->mParserOptions ) {
2214                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2215                 }
2216                 // Clone to allow modifications of the return value without affecting cache
2217                 return clone $this->mParserOptions;
2218         }
2219
2220         /**
2221          * Sets the context this Article is executed in
2222          *
2223          * @param IContextSource $context
2224          * @since 1.18
2225          */
2226         public function setContext( $context ) {
2227                 $this->mContext = $context;
2228         }
2229
2230         /**
2231          * Gets the context this Article is executed in
2232          *
2233          * @return IContextSource
2234          * @since 1.18
2235          */
2236         public function getContext() {
2237                 if ( $this->mContext instanceof IContextSource ) {
2238                         return $this->mContext;
2239                 } else {
2240                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2241                                 "Return RequestContext::getMain(); for sanity\n" );
2242                         return RequestContext::getMain();
2243                 }
2244         }
2245
2246         /**
2247          * Use PHP's magic __get handler to handle accessing of
2248          * raw WikiPage fields for backwards compatibility.
2249          *
2250          * @param string $fname Field name
2251          * @return mixed
2252          */
2253         public function __get( $fname ) {
2254                 if ( property_exists( $this->mPage, $fname ) ) {
2255                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2256                         return $this->mPage->$fname;
2257                 }
2258                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2259         }
2260
2261         /**
2262          * Use PHP's magic __set handler to handle setting of
2263          * raw WikiPage fields for backwards compatibility.
2264          *
2265          * @param string $fname Field name
2266          * @param mixed $fvalue New value
2267          */
2268         public function __set( $fname, $fvalue ) {
2269                 if ( property_exists( $this->mPage, $fname ) ) {
2270                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2271                         $this->mPage->$fname = $fvalue;
2272                 // Note: extensions may want to toss on new fields
2273                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2274                         $this->mPage->$fname = $fvalue;
2275                 } else {
2276                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2277                 }
2278         }
2279
2280         /**
2281          * Call to WikiPage function for backwards compatibility.
2282          * @see WikiPage::checkFlags
2283          */
2284         public function checkFlags( $flags ) {
2285                 return $this->mPage->checkFlags( $flags );
2286         }
2287
2288         /**
2289          * Call to WikiPage function for backwards compatibility.
2290          * @see WikiPage::checkTouched
2291          */
2292         public function checkTouched() {
2293                 return $this->mPage->checkTouched();
2294         }
2295
2296         /**
2297          * Call to WikiPage function for backwards compatibility.
2298          * @see WikiPage::clearPreparedEdit
2299          */
2300         public function clearPreparedEdit() {
2301                 $this->mPage->clearPreparedEdit();
2302         }
2303
2304         /**
2305          * Call to WikiPage function for backwards compatibility.
2306          * @see WikiPage::doDeleteArticleReal
2307          */
2308         public function doDeleteArticleReal(
2309                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2310                 $tags = [], $immediate = false
2311         ) {
2312                 return $this->mPage->doDeleteArticleReal(
2313                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2314                 );
2315         }
2316
2317         /**
2318          * Call to WikiPage function for backwards compatibility.
2319          * @see WikiPage::doDeleteUpdates
2320          */
2321         public function doDeleteUpdates(
2322                 $id,
2323                 Content $content = null,
2324                 $revision = null,
2325                 User $user = null
2326         ) {
2327                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2328         }
2329
2330         /**
2331          * Call to WikiPage function for backwards compatibility.
2332          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2333          * @see WikiPage::doEditContent
2334          */
2335         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2336                 User $user = null, $serialFormat = null
2337         ) {
2338                 wfDeprecated( __METHOD__, '1.29' );
2339                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2340                         $user, $serialFormat
2341                 );
2342         }
2343
2344         /**
2345          * Call to WikiPage function for backwards compatibility.
2346          * @see WikiPage::doEditUpdates
2347          */
2348         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2349                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2350         }
2351
2352         /**
2353          * Call to WikiPage function for backwards compatibility.
2354          * @see WikiPage::doPurge
2355          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2356          *  controlled how much purging was done.
2357          */
2358         public function doPurge() {
2359                 return $this->mPage->doPurge();
2360         }
2361
2362         /**
2363          * Call to WikiPage function for backwards compatibility.
2364          * @see WikiPage::doViewUpdates
2365          */
2366         public function doViewUpdates( User $user, $oldid = 0 ) {
2367                 $this->mPage->doViewUpdates( $user, $oldid );
2368         }
2369
2370         /**
2371          * Call to WikiPage function for backwards compatibility.
2372          * @see WikiPage::exists
2373          */
2374         public function exists() {
2375                 return $this->mPage->exists();
2376         }
2377
2378         /**
2379          * Call to WikiPage function for backwards compatibility.
2380          * @see WikiPage::followRedirect
2381          */
2382         public function followRedirect() {
2383                 return $this->mPage->followRedirect();
2384         }
2385
2386         /**
2387          * Call to WikiPage function for backwards compatibility.
2388          * @see ContentHandler::getActionOverrides
2389          */
2390         public function getActionOverrides() {
2391                 return $this->mPage->getActionOverrides();
2392         }
2393
2394         /**
2395          * Call to WikiPage function for backwards compatibility.
2396          * @see WikiPage::getAutoDeleteReason
2397          */
2398         public function getAutoDeleteReason( &$hasHistory ) {
2399                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2400         }
2401
2402         /**
2403          * Call to WikiPage function for backwards compatibility.
2404          * @see WikiPage::getCategories
2405          */
2406         public function getCategories() {
2407                 return $this->mPage->getCategories();
2408         }
2409
2410         /**
2411          * Call to WikiPage function for backwards compatibility.
2412          * @see WikiPage::getComment
2413          */
2414         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2415                 return $this->mPage->getComment( $audience, $user );
2416         }
2417
2418         /**
2419          * Call to WikiPage function for backwards compatibility.
2420          * @see WikiPage::getContentHandler
2421          */
2422         public function getContentHandler() {
2423                 return $this->mPage->getContentHandler();
2424         }
2425
2426         /**
2427          * Call to WikiPage function for backwards compatibility.
2428          * @see WikiPage::getContentModel
2429          */
2430         public function getContentModel() {
2431                 return $this->mPage->getContentModel();
2432         }
2433
2434         /**
2435          * Call to WikiPage function for backwards compatibility.
2436          * @see WikiPage::getContributors
2437          */
2438         public function getContributors() {
2439                 return $this->mPage->getContributors();
2440         }
2441
2442         /**
2443          * Call to WikiPage function for backwards compatibility.
2444          * @see WikiPage::getCreator
2445          */
2446         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2447                 return $this->mPage->getCreator( $audience, $user );
2448         }
2449
2450         /**
2451          * Call to WikiPage function for backwards compatibility.
2452          * @see WikiPage::getDeletionUpdates
2453          */
2454         public function getDeletionUpdates( Content $content = null ) {
2455                 return $this->mPage->getDeletionUpdates( $content );
2456         }
2457
2458         /**
2459          * Call to WikiPage function for backwards compatibility.
2460          * @see WikiPage::getHiddenCategories
2461          */
2462         public function getHiddenCategories() {
2463                 return $this->mPage->getHiddenCategories();
2464         }
2465
2466         /**
2467          * Call to WikiPage function for backwards compatibility.
2468          * @see WikiPage::getId
2469          */
2470         public function getId() {
2471                 return $this->mPage->getId();
2472         }
2473
2474         /**
2475          * Call to WikiPage function for backwards compatibility.
2476          * @see WikiPage::getLatest
2477          */
2478         public function getLatest() {
2479                 return $this->mPage->getLatest();
2480         }
2481
2482         /**
2483          * Call to WikiPage function for backwards compatibility.
2484          * @see WikiPage::getLinksTimestamp
2485          */
2486         public function getLinksTimestamp() {
2487                 return $this->mPage->getLinksTimestamp();
2488         }
2489
2490         /**
2491          * Call to WikiPage function for backwards compatibility.
2492          * @see WikiPage::getMinorEdit
2493          */
2494         public function getMinorEdit() {
2495                 return $this->mPage->getMinorEdit();
2496         }
2497
2498         /**
2499          * Call to WikiPage function for backwards compatibility.
2500          * @see WikiPage::getOldestRevision
2501          */
2502         public function getOldestRevision() {
2503                 return $this->mPage->getOldestRevision();
2504         }
2505
2506         /**
2507          * Call to WikiPage function for backwards compatibility.
2508          * @see WikiPage::getRedirectTarget
2509          */
2510         public function getRedirectTarget() {
2511                 return $this->mPage->getRedirectTarget();
2512         }
2513
2514         /**
2515          * Call to WikiPage function for backwards compatibility.
2516          * @see WikiPage::getRedirectURL
2517          */
2518         public function getRedirectURL( $rt ) {
2519                 return $this->mPage->getRedirectURL( $rt );
2520         }
2521
2522         /**
2523          * Call to WikiPage function for backwards compatibility.
2524          * @see WikiPage::getRevision
2525          */
2526         public function getRevision() {
2527                 return $this->mPage->getRevision();
2528         }
2529
2530         /**
2531          * Call to WikiPage function for backwards compatibility.
2532          * @see WikiPage::getTimestamp
2533          */
2534         public function getTimestamp() {
2535                 return $this->mPage->getTimestamp();
2536         }
2537
2538         /**
2539          * Call to WikiPage function for backwards compatibility.
2540          * @see WikiPage::getTouched
2541          */
2542         public function getTouched() {
2543                 return $this->mPage->getTouched();
2544         }
2545
2546         /**
2547          * Call to WikiPage function for backwards compatibility.
2548          * @see WikiPage::getUndoContent
2549          */
2550         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2551                 return $this->mPage->getUndoContent( $undo, $undoafter );
2552         }
2553
2554         /**
2555          * Call to WikiPage function for backwards compatibility.
2556          * @see WikiPage::getUser
2557          */
2558         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2559                 return $this->mPage->getUser( $audience, $user );
2560         }
2561
2562         /**
2563          * Call to WikiPage function for backwards compatibility.
2564          * @see WikiPage::getUserText
2565          */
2566         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
2567                 return $this->mPage->getUserText( $audience, $user );
2568         }
2569
2570         /**
2571          * Call to WikiPage function for backwards compatibility.
2572          * @see WikiPage::hasViewableContent
2573          */
2574         public function hasViewableContent() {
2575                 return $this->mPage->hasViewableContent();
2576         }
2577
2578         /**
2579          * Call to WikiPage function for backwards compatibility.
2580          * @see WikiPage::insertOn
2581          */
2582         public function insertOn( $dbw, $pageId = null ) {
2583                 return $this->mPage->insertOn( $dbw, $pageId );
2584         }
2585
2586         /**
2587          * Call to WikiPage function for backwards compatibility.
2588          * @see WikiPage::insertProtectNullRevision
2589          */
2590         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2591                 array $expiry, $cascade, $reason, $user = null
2592         ) {
2593                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2594                         $expiry, $cascade, $reason, $user
2595                 );
2596         }
2597
2598         /**
2599          * Call to WikiPage function for backwards compatibility.
2600          * @see WikiPage::insertRedirect
2601          */
2602         public function insertRedirect() {
2603                 return $this->mPage->insertRedirect();
2604         }
2605
2606         /**
2607          * Call to WikiPage function for backwards compatibility.
2608          * @see WikiPage::insertRedirectEntry
2609          */
2610         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2611                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2612         }
2613
2614         /**
2615          * Call to WikiPage function for backwards compatibility.
2616          * @see WikiPage::isCountable
2617          */
2618         public function isCountable( $editInfo = false ) {
2619                 return $this->mPage->isCountable( $editInfo );
2620         }
2621
2622         /**
2623          * Call to WikiPage function for backwards compatibility.
2624          * @see WikiPage::isRedirect
2625          */
2626         public function isRedirect() {
2627                 return $this->mPage->isRedirect();
2628         }
2629
2630         /**
2631          * Call to WikiPage function for backwards compatibility.
2632          * @see WikiPage::loadFromRow
2633          */
2634         public function loadFromRow( $data, $from ) {
2635                 return $this->mPage->loadFromRow( $data, $from );
2636         }
2637
2638         /**
2639          * Call to WikiPage function for backwards compatibility.
2640          * @see WikiPage::loadPageData
2641          */
2642         public function loadPageData( $from = 'fromdb' ) {
2643                 $this->mPage->loadPageData( $from );
2644         }
2645
2646         /**
2647          * Call to WikiPage function for backwards compatibility.
2648          * @see WikiPage::lockAndGetLatest
2649          */
2650         public function lockAndGetLatest() {
2651                 return $this->mPage->lockAndGetLatest();
2652         }
2653
2654         /**
2655          * Call to WikiPage function for backwards compatibility.
2656          * @see WikiPage::makeParserOptions
2657          */
2658         public function makeParserOptions( $context ) {
2659                 return $this->mPage->makeParserOptions( $context );
2660         }
2661
2662         /**
2663          * Call to WikiPage function for backwards compatibility.
2664          * @see WikiPage::pageDataFromId
2665          */
2666         public function pageDataFromId( $dbr, $id, $options = [] ) {
2667                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2668         }
2669
2670         /**
2671          * Call to WikiPage function for backwards compatibility.
2672          * @see WikiPage::pageDataFromTitle
2673          */
2674         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2675                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2676         }
2677
2678         /**
2679          * Call to WikiPage function for backwards compatibility.
2680          * @see WikiPage::prepareContentForEdit
2681          */
2682         public function prepareContentForEdit(
2683                 Content $content, $revision = null, User $user = null,
2684                 $serialFormat = null, $useCache = true
2685         ) {
2686                 return $this->mPage->prepareContentForEdit(
2687                         $content, $revision, $user,
2688                         $serialFormat, $useCache
2689                 );
2690         }
2691
2692         /**
2693          * Call to WikiPage function for backwards compatibility.
2694          * @see WikiPage::protectDescription
2695          */
2696         public function protectDescription( array $limit, array $expiry ) {
2697                 return $this->mPage->protectDescription( $limit, $expiry );
2698         }
2699
2700         /**
2701          * Call to WikiPage function for backwards compatibility.
2702          * @see WikiPage::protectDescriptionLog
2703          */
2704         public function protectDescriptionLog( array $limit, array $expiry ) {
2705                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2706         }
2707
2708         /**
2709          * Call to WikiPage function for backwards compatibility.
2710          * @see WikiPage::replaceSectionAtRev
2711          */
2712         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2713                 $sectionTitle = '', $baseRevId = null
2714         ) {
2715                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2716                         $sectionTitle, $baseRevId
2717                 );
2718         }
2719
2720         /**
2721          * Call to WikiPage function for backwards compatibility.
2722          * @see WikiPage::replaceSectionContent
2723          */
2724         public function replaceSectionContent(
2725                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2726         ) {
2727                 return $this->mPage->replaceSectionContent(
2728                         $sectionId, $sectionContent, $sectionTitle, $edittime
2729                 );
2730         }
2731
2732         /**
2733          * Call to WikiPage function for backwards compatibility.
2734          * @see WikiPage::setTimestamp
2735          */
2736         public function setTimestamp( $ts ) {
2737                 $this->mPage->setTimestamp( $ts );
2738         }
2739
2740         /**
2741          * Call to WikiPage function for backwards compatibility.
2742          * @see WikiPage::shouldCheckParserCache
2743          */
2744         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2745                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2746         }
2747
2748         /**
2749          * Call to WikiPage function for backwards compatibility.
2750          * @see WikiPage::supportsSections
2751          */
2752         public function supportsSections() {
2753                 return $this->mPage->supportsSections();
2754         }
2755
2756         /**
2757          * Call to WikiPage function for backwards compatibility.
2758          * @see WikiPage::triggerOpportunisticLinksUpdate
2759          */
2760         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2761                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2762         }
2763
2764         /**
2765          * Call to WikiPage function for backwards compatibility.
2766          * @see WikiPage::updateCategoryCounts
2767          */
2768         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2769                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2770         }
2771
2772         /**
2773          * Call to WikiPage function for backwards compatibility.
2774          * @see WikiPage::updateIfNewerOn
2775          */
2776         public function updateIfNewerOn( $dbw, $revision ) {
2777                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2778         }
2779
2780         /**
2781          * Call to WikiPage function for backwards compatibility.
2782          * @see WikiPage::updateRedirectOn
2783          */
2784         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2785                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2786         }
2787
2788         /**
2789          * Call to WikiPage function for backwards compatibility.
2790          * @see WikiPage::updateRevisionOn
2791          */
2792         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2793                 $lastRevIsRedirect = null
2794         ) {
2795                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2796                         $lastRevIsRedirect
2797                 );
2798         }
2799
2800         /**
2801          * @param array $limit
2802          * @param array $expiry
2803          * @param bool &$cascade
2804          * @param string $reason
2805          * @param User $user
2806          * @return Status
2807          */
2808         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2809                 $reason, User $user
2810         ) {
2811                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2812         }
2813
2814         /**
2815          * @param array $limit
2816          * @param string $reason
2817          * @param int &$cascade
2818          * @param array $expiry
2819          * @return bool
2820          */
2821         public function updateRestrictions( $limit = [], $reason = '',
2822                 &$cascade = 0, $expiry = []
2823         ) {
2824                 return $this->mPage->doUpdateRestrictions(
2825                         $limit,
2826                         $expiry,
2827                         $cascade,
2828                         $reason,
2829                         $this->getContext()->getUser()
2830                 );
2831         }
2832
2833         /**
2834          * @param string $reason
2835          * @param bool $suppress
2836          * @param int|null $u1 Unused
2837          * @param bool|null $u2 Unused
2838          * @param string &$error
2839          * @param bool $immediate false allows deleting over time via the job queue
2840          * @return bool
2841          * @throws FatalError
2842          * @throws MWException
2843          */
2844         public function doDeleteArticle(
2845                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2846         ) {
2847                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2848                         null, $immediate );
2849         }
2850
2851         /**
2852          * @param string $fromP
2853          * @param string $summary
2854          * @param string $token
2855          * @param bool $bot
2856          * @param array &$resultDetails
2857          * @param User|null $user
2858          * @return array
2859          */
2860         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2861                 if ( !$user ) {
2862                         $user = $this->getContext()->getUser();
2863                 }
2864
2865                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2866         }
2867
2868         /**
2869          * @param string $fromP
2870          * @param string $summary
2871          * @param bool $bot
2872          * @param array &$resultDetails
2873          * @param User|null $guser
2874          * @return array
2875          */
2876         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2877                 if ( !$guser ) {
2878                         $guser = $this->getContext()->getUser();
2879                 }
2880
2881                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2882         }
2883
2884         /**
2885          * @param bool &$hasHistory
2886          * @return mixed
2887          */
2888         public function generateReason( &$hasHistory ) {
2889                 $title = $this->mPage->getTitle();
2890                 $handler = ContentHandler::getForTitle( $title );
2891                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2892         }
2893
2894         // ******
2895 }