includes/page/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use MediaWiki\Block\DatabaseBlock;
  23 use MediaWiki\MediaWikiServices;
  24 use MediaWiki\Revision\MutableRevisionRecord;
  25 use MediaWiki\Revision\RevisionRecord;
  26 use MediaWiki\Revision\SlotRecord;
  27
  28 /**
  29  * Class for viewing MediaWiki article and history.
  30  *
  31  * This maintains WikiPage functions for backwards compatibility.
  32  *
  33  * @todo Move and rewrite code to an Action class
  34  *
  35  * Note: edit user interface and cache support functions have been
  36  * moved to separate EditPage and HTMLFileCache classes.
  37  */
  38 class Article implements Page {
  39         /**
  40          * @var IContextSource|null The context this Article is executed in.
  41          * If null, RequestContext::getMain() is used.
  42          */
  43         protected $mContext;
  44
  45         /** @var WikiPage|null The WikiPage object of this instance */
  46         protected $mPage;
  47
  48         /**
  49          * @var ParserOptions|null ParserOptions object for $wgUser articles.
  50          * Initialized by getParserOptions by calling $this->mPage->makeParserOptions().
  51          */
  52         public $mParserOptions;
  53
  54         /**
  55          * @var Content|null Content of the main slot of $this->mRevision.
  56          * @note This variable is read only, setting it has no effect.
  57          *       Extensions that wish to override the output of Article::view should use a hook.
  58          * @todo MCR: Remove in 1.33
  59          * @deprecated since 1.32
  60          * @since 1.21
  61          */
  62         public $mContentObject;
  63
  64         /**
  65          * @var bool Is the target revision loaded? Set by fetchRevisionRecord().
  66          *
  67          * @deprecated since 1.32. Whether content has been loaded should not be relevant to
  68          * code outside this class.
  69          */
  70         public $mContentLoaded = false;
  71
  72         /**
  73          * @var int|null The oldid of the article that was requested to be shown,
  74          * 0 for the current revision.
  75          * @see $mRevIdFetched
  76          */
  77         public $mOldId;
  78
  79         /** @var Title|null Title from which we were redirected here, if any. */
  80         public $mRedirectedFrom = null;
  81
  82         /** @var string|bool URL to redirect to or false if none */
  83         public $mRedirectUrl = false;
  84
  85         /**
  86          * @var int Revision ID of revision that was loaded.
  87          * @see $mOldId
  88          * @deprecated since 1.32, use getRevIdFetched() instead.
  89          */
  90         public $mRevIdFetched = 0;
  91
  92         /**
  93          * @var Status|null represents the outcome of fetchRevisionRecord().
  94          * $fetchResult->value is the RevisionRecord object, if the operation was successful.
  95          *
  96          * The information in $fetchResult is duplicated by the following deprecated public fields:
  97          * $mRevIdFetched, $mContentLoaded. $mRevision (and $mContentObject) also typically duplicate
  98          * information of the loaded revision, but may be overwritten by extensions or due to errors.
  99          */
 100         private $fetchResult = null;
 101
 102         /**
 103          * @var Revision|null Revision to be shown. Initialized by getOldIDFromRequest()
 104          * or fetchContentObject(). Normally loaded from the database, but may be replaced
 105          * by an extension, or be a fake representing an error message or some such.
 106          * While the output of Article::view is typically based on this revision,
 107          * it may be overwritten by error messages or replaced by extensions.
 108          */
 109         public $mRevision = null;
 110
 111         /**
 112          * @var ParserOutput|null|false The ParserOutput generated for viewing the page,
 113          * initialized by view(). If no ParserOutput could be generated, this is set to false.
 114          * @deprecated since 1.32
 115          */
 116         public $mParserOutput = null;
 117
 118         /**
 119          * @var bool Whether render() was called. With the way subclasses work
 120          * here, there doesn't seem to be any other way to stop calling
 121          * OutputPage::enableSectionEditLinks() and still have it work as it did before.
 122          */
 123         protected $viewIsRenderAction = false;
 124
 125         /**
 126          * Constructor and clear the article
 127          * @param Title $title Reference to a Title object.
 128          * @param int|null $oldId Revision ID, null to fetch from request, zero for current
 129          */
 130         public function __construct( Title $title, $oldId = null ) {
 131                 $this->mOldId = $oldId;
 132                 $this->mPage = $this->newPage( $title );
 133         }
 134
 135         /**
 136          * @param Title $title
 137          * @return WikiPage
 138          */
 139         protected function newPage( Title $title ) {
 140                 return new WikiPage( $title );
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          * @param int $id Article ID to load
 146          * @return Article|null
 147          */
 148         public static function newFromID( $id ) {
 149                 $t = Title::newFromID( $id );
 150                 return $t == null ? null : new static( $t );
 151         }
 152
 153         /**
 154          * Create an Article object of the appropriate class for the given page.
 155          *
 156          * @param Title $title
 157          * @param IContextSource $context
 158          * @return Article
 159          */
 160         public static function newFromTitle( $title, IContextSource $context ) {
 161                 if ( NS_MEDIA == $title->getNamespace() ) {
 162                         // XXX: This should not be here, but where should it go?
 163                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 164                 }
 165
 166                 $page = null;
 167                 Hooks::run( 'ArticleFromTitle', [ &$title, &$page, $context ] );
 168                 if ( !$page ) {
 169                         switch ( $title->getNamespace() ) {
 170                                 case NS_FILE:
 171                                         $page = new ImagePage( $title );
 172                                         break;
 173                                 case NS_CATEGORY:
 174                                         $page = new CategoryPage( $title );
 175                                         break;
 176                                 default:
 177                                         $page = new Article( $title );
 178                         }
 179                 }
 180                 $page->setContext( $context );
 181
 182                 return $page;
 183         }
 184
 185         /**
 186          * Create an Article object of the appropriate class for the given page.
 187          *
 188          * @param WikiPage $page
 189          * @param IContextSource $context
 190          * @return Article
 191          */
 192         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 193                 $article = self::newFromTitle( $page->getTitle(), $context );
 194                 $article->mPage = $page; // override to keep process cached vars
 195                 return $article;
 196         }
 197
 198         /**
 199          * Get the page this view was redirected from
 200          * @return Title|null
 201          * @since 1.28
 202          */
 203         public function getRedirectedFrom() {
 204                 return $this->mRedirectedFrom;
 205         }
 206
 207         /**
 208          * Tell the page view functions that this view was redirected
 209          * from another page on the wiki.
 210          * @param Title $from
 211          */
 212         public function setRedirectedFrom( Title $from ) {
 213                 $this->mRedirectedFrom = $from;
 214         }
 215
 216         /**
 217          * Get the title object of the article
 218          *
 219          * @return Title Title object of this page
 220          */
 221         public function getTitle() {
 222                 return $this->mPage->getTitle();
 223         }
 224
 225         /**
 226          * Get the WikiPage object of this instance
 227          *
 228          * @since 1.19
 229          * @return WikiPage
 230          */
 231         public function getPage() {
 232                 return $this->mPage;
 233         }
 234
 235         /**
 236          * Clear the object
 237          */
 238         public function clear() {
 239                 $this->mContentLoaded = false;
 240
 241                 $this->mRedirectedFrom = null; # Title object if set
 242                 $this->mRevIdFetched = 0;
 243                 $this->mRedirectUrl = false;
 244                 $this->mRevision = null;
 245                 $this->mContentObject = null;
 246                 $this->fetchResult = null;
 247
 248                 // TODO hard-deprecate direct access to public fields
 249
 250                 $this->mPage->clear();
 251         }
 252
 253         /**
 254          * Returns a Content object representing the pages effective display content,
 255          * not necessarily the revision's content!
 256          *
 257          * Note that getContent does not follow redirects anymore.
 258          * If you need to fetch redirectable content easily, try
 259          * the shortcut in WikiPage::getRedirectTarget()
 260          *
 261          * This function has side effects! Do not use this function if you
 262          * only want the real revision text if any.
 263          *
 264          * @deprecated since 1.32, use getRevisionFetched() or fetchRevisionRecord() instead.
 265          *
 266          * @return Content
 267          *
 268          * @since 1.21
 269          */
 270         protected function getContentObject() {
 271                 if ( $this->mPage->getId() === 0 ) {
 272                         $content = $this->getSubstituteContent();
 273                 } else {
 274                         $this->fetchContentObject();
 275                         $content = $this->mContentObject;
 276                 }
 277
 278                 return $content;
 279         }
 280
 281         /**
 282          * Returns Content object to use when the page does not exist.
 283          *
 284          * @return Content
 285          */
 286         private function getSubstituteContent() {
 287                 # If this is a MediaWiki:x message, then load the messages
 288                 # and return the message value for x.
 289                 if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 290                         $text = $this->getTitle()->getDefaultMessageText();
 291                         if ( $text === false ) {
 292                                 $text = '';
 293                         }
 294
 295                         $content = ContentHandler::makeContent( $text, $this->getTitle() );
 296                 } else {
 297                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 298                         $content = new MessageContent( $message, null );
 299                 }
 300
 301                 return $content;
 302         }
 303
 304         /**
 305          * Returns ParserOutput to use when a page does not exist. In some cases, we still want to show
 306          * "virtual" content, e.g. in the MediaWiki namespace, or in the File namespace for non-local
 307          * files.
 308          *
 309          * @param ParserOptions $options
 310          *
 311          * @return ParserOutput
 312          */
 313         protected function getEmptyPageParserOutput( ParserOptions $options ) {
 314                 $content = $this->getSubstituteContent();
 315
 316                 return $content->getParserOutput( $this->getTitle(), 0, $options );
 317         }
 318
 319         /**
 320          * @see getOldIDFromRequest()
 321          * @see getRevIdFetched()
 322          *
 323          * @return int The oldid of the article that is was requested in the constructor or via the
 324          *         context's WebRequest.
 325          */
 326         public function getOldID() {
 327                 if ( is_null( $this->mOldId ) ) {
 328                         $this->mOldId = $this->getOldIDFromRequest();
 329                 }
 330
 331                 return $this->mOldId;
 332         }
 333
 334         /**
 335          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 336          *
 337          * @return int The old id for the request
 338          */
 339         public function getOldIDFromRequest() {
 340                 $this->mRedirectUrl = false;
 341
 342                 $request = $this->getContext()->getRequest();
 343                 $oldid = $request->getIntOrNull( 'oldid' );
 344
 345                 if ( $oldid === null ) {
 346                         return 0;
 347                 }
 348
 349                 if ( $oldid !== 0 ) {
 350                         # Load the given revision and check whether the page is another one.
 351                         # In that case, update this instance to reflect the change.
 352                         if ( $oldid === $this->mPage->getLatest() ) {
 353                                 $this->mRevision = $this->mPage->getRevision();
 354                         } else {
 355                                 $this->mRevision = Revision::newFromId( $oldid );
 356                                 if ( $this->mRevision !== null ) {
 357                                         // Revision title doesn't match the page title given?
 358                                         if ( $this->mPage->getId() != $this->mRevision->getPage() ) {
 359                                                 $function = get_class( $this->mPage ) . '::newFromID';
 360                                                 $this->mPage = $function( $this->mRevision->getPage() );
 361                                         }
 362                                 }
 363                         }
 364                 }
 365
 366                 if ( $request->getVal( 'direction' ) == 'next' ) {
 367                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 368                         if ( $nextid ) {
 369                                 $oldid = $nextid;
 370                                 $this->mRevision = null;
 371                         } else {
 372                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 373                         }
 374                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 375                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 376                         if ( $previd ) {
 377                                 $oldid = $previd;
 378                                 $this->mRevision = null;
 379                         }
 380                 }
 381
 382                 $this->mRevIdFetched = $this->mRevision ? $this->mRevision->getId() : 0;
 383
 384                 return $oldid;
 385         }
 386
 387         /**
 388          * Get text content object
 389          * Does *NOT* follow redirects.
 390          * @todo When is this null?
 391          * @deprecated since 1.32, use fetchRevisionRecord() instead.
 392          *
 393          * @note Code that wants to retrieve page content from the database should
 394          * use WikiPage::getContent().
 395          *
 396          * @return Content|null|bool
 397          *
 398          * @since 1.21
 399          */
 400         protected function fetchContentObject() {
 401                 if ( !$this->mContentLoaded ) {
 402                         $this->fetchRevisionRecord();
 403                 }
 404
 405                 return $this->mContentObject;
 406         }
 407
 408         /**
 409          * Fetches the revision to work on.
 410          * The revision is typically loaded from the database, but may also be a fake representing
 411          * an error message or content supplied by an extension. Refer to $this->fetchResult for
 412          * the revision actually loaded from the database, and any errors encountered while doing
 413          * that.
 414          *
 415          * @return RevisionRecord|null
 416          */
 417         protected function fetchRevisionRecord() {
 418                 if ( $this->fetchResult ) {
 419                         return $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 420                 }
 421
 422                 $this->mContentLoaded = true;
 423                 $this->mContentObject = null;
 424
 425                 $oldid = $this->getOldID();
 426
 427                 // $this->mRevision might already be fetched by getOldIDFromRequest()
 428                 if ( !$this->mRevision ) {
 429                         if ( !$oldid ) {
 430                                 $this->mRevision = $this->mPage->getRevision();
 431
 432                                 if ( !$this->mRevision ) {
 433                                         wfDebug( __METHOD__ . " failed to find page data for title " .
 434                                                 $this->getTitle()->getPrefixedText() . "\n" );
 435
 436                                         // Just for sanity, output for this case is done by showMissingArticle().
 437                                         $this->fetchResult = Status::newFatal( 'noarticletext' );
 438                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 439                                         return null;
 440                                 }
 441                         } else {
 442                                 $this->mRevision = Revision::newFromId( $oldid );
 443
 444                                 if ( !$this->mRevision ) {
 445                                         wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid\n" );
 446
 447                                         $this->fetchResult = Status::newFatal( 'missing-revision', $oldid );
 448                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 449                                         return null;
 450                                 }
 451                         }
 452                 }
 453
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455                 $this->fetchResult = Status::newGood( $this->mRevision );
 456
 457                 if (
 458                         !$this->mRevision->userCan( RevisionRecord::DELETED_TEXT, $this->getContext()->getUser() )
 459                 ) {
 460                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 461                                 $this->mRevision->getId() . "\n" );
 462
 463                         // Just for sanity, output for this case is done by showDeletedRevisionHeader().
 464                         $this->fetchResult = Status::newFatal( 'rev-deleted-text-permission' );
 465                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 466                         return null;
 467                 }
 468
 469                 if ( Hooks::isRegistered( 'ArticleAfterFetchContentObject' ) ) {
 470                         $contentObject = $this->mRevision->getContent(
 471                                 RevisionRecord::FOR_THIS_USER,
 472                                 $this->getContext()->getUser()
 473                         );
 474
 475                         $hookContentObject = $contentObject;
 476
 477                                 // Avoid PHP 7.1 warning of passing $this by reference
 478                         $articlePage = $this;
 479
 480                         Hooks::run(
 481                                 'ArticleAfterFetchContentObject',
 482                                 [ &$articlePage, &$hookContentObject ],
 483                                 '1.32'
 484                         );
 485
 486                         if ( $hookContentObject !== $contentObject ) {
 487                                 // A hook handler is trying to override the content
 488                                 $this->applyContentOverride( $hookContentObject );
 489                         }
 490                 }
 491
 492                 // For B/C only
 493                 $this->mContentObject = $this->mRevision->getContent(
 494                         RevisionRecord::FOR_THIS_USER,
 495                         $this->getContext()->getUser()
 496                 );
 497
 498                 return $this->mRevision->getRevisionRecord();
 499         }
 500
 501         /**
 502          * Returns a Content object representing any error in $this->fetchContent, or null
 503          * if there is no such error.
 504          *
 505          * @return Content|null
 506          */
 507         private function makeFetchErrorContent() {
 508                 if ( !$this->fetchResult || $this->fetchResult->isOK() ) {
 509                         return null;
 510                 }
 511
 512                 return new MessageContent( $this->fetchResult->getMessage() );
 513         }
 514
 515         /**
 516          * Applies a content override by constructing a fake Revision object and assigning
 517          * it to mRevision. The fake revision will not have a user, timestamp or summary set.
 518          *
 519          * This mechanism exists mainly to accommodate extensions that use the
 520          * ArticleAfterFetchContentObject. Once that hook has been removed, there should no longer
 521          * be a need for a fake revision object. fetchRevisionRecord() presently also uses this mechanism
 522          * to report errors, but that could be changed to use $this->fetchResult instead.
 523          *
 524          * @param Content $override Content to be used instead of the actual page content,
 525          *        coming from an extension or representing an error message.
 526          */
 527         private function applyContentOverride( Content $override ) {
 528                 // Construct a fake revision
 529                 $rev = new MutableRevisionRecord( $this->getTitle() );
 530                 $rev->setContent( SlotRecord::MAIN, $override );
 531
 532                 $this->mRevision = new Revision( $rev );
 533
 534                 // For B/C only
 535                 $this->mContentObject = $override;
 536         }
 537
 538         /**
 539          * Returns true if the currently-referenced revision is the current edit
 540          * to this page (and it exists).
 541          * @return bool
 542          */
 543         public function isCurrent() {
 544                 # If no oldid, this is the current version.
 545                 if ( $this->getOldID() == 0 ) {
 546                         return true;
 547                 }
 548
 549                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 550         }
 551
 552         /**
 553          * Get the fetched Revision object depending on request parameters or null
 554          * on failure. The revision returned may be a fake representing an error message or
 555          * wrapping content supplied by an extension. Refer to $this->fetchResult for the
 556          * revision actually loaded from the database.
 557          *
 558          * @since 1.19
 559          * @return Revision|null
 560          */
 561         public function getRevisionFetched() {
 562                 $this->fetchRevisionRecord();
 563
 564                 if ( $this->fetchResult->isOK() ) {
 565                         return $this->mRevision;
 566                 }
 567         }
 568
 569         /**
 570          * Use this to fetch the rev ID used on page views
 571          *
 572          * Before fetchRevisionRecord was called, this returns the page's latest revision,
 573          * regardless of what getOldID() returns.
 574          *
 575          * @return int Revision ID of last article revision
 576          */
 577         public function getRevIdFetched() {
 578                 if ( $this->fetchResult && $this->fetchResult->isOK() ) {
 579                         return $this->fetchResult->value->getId();
 580                 } else {
 581                         return $this->mPage->getLatest();
 582                 }
 583         }
 584
 585         /**
 586          * This is the default action of the index.php entry point: just view the
 587          * page of the given title.
 588          */
 589         public function view() {
 590                 global $wgUseFileCache, $wgDebugToolbar;
 591
 592                 # Get variables from query string
 593                 # As side effect this will load the revision and update the title
 594                 # in a revision ID is passed in the request, so this should remain
 595                 # the first call of this method even if $oldid is used way below.
 596                 $oldid = $this->getOldID();
 597
 598                 $user = $this->getContext()->getUser();
 599                 # Another whitelist check in case getOldID() is altering the title
 600                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 601                 if ( count( $permErrors ) ) {
 602                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 603                         throw new PermissionsError( 'read', $permErrors );
 604                 }
 605
 606                 $outputPage = $this->getContext()->getOutput();
 607                 # getOldID() may as well want us to redirect somewhere else
 608                 if ( $this->mRedirectUrl ) {
 609                         $outputPage->redirect( $this->mRedirectUrl );
 610                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 611
 612                         return;
 613                 }
 614
 615                 # If we got diff in the query, we want to see a diff page instead of the article.
 616                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 617                         wfDebug( __METHOD__ . ": showing diff page\n" );
 618                         $this->showDiffPage();
 619
 620                         return;
 621                 }
 622
 623                 # Set page title (may be overridden by DISPLAYTITLE)
 624                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 625
 626                 $outputPage->setArticleFlag( true );
 627                 # Allow frames by default
 628                 $outputPage->allowClickjacking();
 629
 630                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 631
 632                 $parserOptions = $this->getParserOptions();
 633                 $poOptions = [];
 634                 # Render printable version, use printable version cache
 635                 if ( $outputPage->isPrintable() ) {
 636                         $parserOptions->setIsPrintable( true );
 637                         $poOptions['enableSectionEditLinks'] = false;
 638                 } elseif ( $this->viewIsRenderAction
 639                         || !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user )
 640                 ) {
 641                         $poOptions['enableSectionEditLinks'] = false;
 642                 }
 643
 644                 # Try client and file cache
 645                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 646                         # Try to stream the output from file cache
 647                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 648                                 wfDebug( __METHOD__ . ": done file cache\n" );
 649                                 # tell wgOut that output is taken care of
 650                                 $outputPage->disable();
 651                                 $this->mPage->doViewUpdates( $user, $oldid );
 652
 653                                 return;
 654                         }
 655                 }
 656
 657                 # Should the parser cache be used?
 658                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 659                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 660                 if ( $user->getStubThreshold() ) {
 661                         MediaWikiServices::getInstance()->getStatsdDataFactory()->increment( 'pcache_miss_stub' );
 662                 }
 663
 664                 $this->showRedirectedFromHeader();
 665                 $this->showNamespaceHeader();
 666
 667                 # Iterate through the possible ways of constructing the output text.
 668                 # Keep going until $outputDone is set, or we run out of things to do.
 669                 $pass = 0;
 670                 $outputDone = false;
 671                 $this->mParserOutput = false;
 672
 673                 while ( !$outputDone && ++$pass ) {
 674                         switch ( $pass ) {
 675                                 case 1:
 676                                         // Avoid PHP 7.1 warning of passing $this by reference
 677                                         $articlePage = $this;
 678                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 679                                         break;
 680                                 case 2:
 681                                         # Early abort if the page doesn't exist
 682                                         if ( !$this->mPage->exists() ) {
 683                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 684                                                 $this->showMissingArticle();
 685                                                 $this->mPage->doViewUpdates( $user );
 686                                                 return;
 687                                         }
 688
 689                                         # Try the parser cache
 690                                         if ( $useParserCache ) {
 691                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 692
 693                                                 if ( $this->mParserOutput !== false ) {
 694                                                         if ( $oldid ) {
 695                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 696                                                                 $this->setOldSubtitle( $oldid );
 697                                                         } else {
 698                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 699                                                         }
 700                                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 701                                                         # Ensure that UI elements requiring revision ID have
 702                                                         # the correct version information.
 703                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 704                                                         # Preload timestamp to avoid a DB hit
 705                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 706                                                         if ( $cachedTimestamp !== null ) {
 707                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 708                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 709                                                         }
 710                                                         $outputDone = true;
 711                                                 }
 712                                         }
 713                                         break;
 714                                 case 3:
 715                                         # Are we looking at an old revision
 716                                         $rev = $this->fetchRevisionRecord();
 717                                         if ( $oldid && $this->fetchResult->isOK() ) {
 718                                                 $this->setOldSubtitle( $oldid );
 719
 720                                                 if ( !$this->showDeletedRevisionHeader() ) {
 721                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 722                                                         return;
 723                                                 }
 724                                         }
 725
 726                                         # Ensure that UI elements requiring revision ID have
 727                                         # the correct version information.
 728                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 729                                         # Preload timestamp to avoid a DB hit
 730                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 731
 732                                         # Pages containing custom CSS or JavaScript get special treatment
 733                                         if ( $this->getTitle()->isSiteConfigPage() || $this->getTitle()->isUserConfigPage() ) {
 734                                                 $dir = $this->getContext()->getLanguage()->getDir();
 735                                                 $lang = $this->getContext()->getLanguage()->getHtmlCode();
 736
 737                                                 $outputPage->wrapWikiMsg(
 738                                                         "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 739                                                         'clearyourcache'
 740                                                 );
 741                                         } elseif ( !Hooks::run( 'ArticleRevisionViewCustom', [
 742                                                         $rev,
 743                                                         $this->getTitle(),
 744                                                         $oldid,
 745                                                         $outputPage,
 746                                                 ] )
 747                                         ) {
 748                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 749                                                 // Allow extensions do their own custom view for certain pages
 750                                                 $outputDone = true;
 751                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 752                                                 [ $this->fetchContentObject(), $this->getTitle(), $outputPage ], '1.32' )
 753                                         ) {
 754                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 755                                                 // Allow extensions do their own custom view for certain pages
 756                                                 $outputDone = true;
 757                                         }
 758                                         break;
 759                                 case 4:
 760                                         # Run the parse, protected by a pool counter
 761                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 762
 763                                         $rev = $this->fetchRevisionRecord();
 764                                         $error = null;
 765
 766                                         if ( $rev ) {
 767                                                 $poolArticleView = new PoolWorkArticleView(
 768                                                         $this->getPage(),
 769                                                         $parserOptions,
 770                                                         $this->getRevIdFetched(),
 771                                                         $useParserCache,
 772                                                         $rev,
 773                                                         // permission checking was done earlier via showDeletedRevisionHeader()
 774                                                         RevisionRecord::RAW
 775                                                 );
 776                                                 $ok = $poolArticleView->execute();
 777                                                 $error = $poolArticleView->getError();
 778                                                 $this->mParserOutput = $poolArticleView->getParserOutput() ?: null;
 779
 780                                                 # Don't cache a dirty ParserOutput object
 781                                                 if ( $poolArticleView->getIsDirty() ) {
 782                                                         $outputPage->setCdnMaxage( 0 );
 783                                                         $outputPage->addHTML( "<!-- parser cache is expired, " .
 784                                                                 "sending anyway due to pool overload-->\n" );
 785                                                 }
 786                                         } else {
 787                                                 $ok = false;
 788                                         }
 789
 790                                         if ( !$ok ) {
 791                                                 if ( $error ) {
 792                                                         $outputPage->clearHTML(); // for release() errors
 793                                                         $outputPage->enableClientCache( false );
 794                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 795
 796                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 797                                                         $outputPage->wrapWikiTextAsInterface( 'errorbox', $errortext );
 798                                                 }
 799                                                 # Connection or timeout error
 800                                                 return;
 801                                         }
 802
 803                                         if ( $this->mParserOutput ) {
 804                                                 $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 805                                         }
 806
 807                                         if ( $rev && $this->getRevisionRedirectTarget( $rev ) ) {
 808                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 809                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 810                                         }
 811
 812                                         $outputDone = true;
 813                                         break;
 814                                 # Should be unreachable, but just in case...
 815                                 default:
 816                                         break 2;
 817                         }
 818                 }
 819
 820                 // Get the ParserOutput actually *displayed* here.
 821                 // Note that $this->mParserOutput is the *current*/oldid version output.
 822                 // Note that the ArticleViewHeader hook is allowed to set $outputDone to a
 823                 // ParserOutput instance.
 824                 $pOutput = ( $outputDone instanceof ParserOutput )
 825                         ? $outputDone // object fetched by hook
 826                         : ( $this->mParserOutput ?: null ); // ParserOutput or null, avoid false
 827
 828                 # Adjust title for main page & pages with displaytitle
 829                 if ( $pOutput ) {
 830                         $this->adjustDisplayTitle( $pOutput );
 831                 }
 832
 833                 # For the main page, overwrite the <title> element with the con-
 834                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 835                 # that's not empty).
 836                 # This message always exists because it is in the i18n files
 837                 if ( $this->getTitle()->isMainPage() ) {
 838                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 839                         if ( !$msg->isDisabled() ) {
 840                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 841                         }
 842                 }
 843
 844                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 845                 # This could use getTouched(), but that could be scary for major template edits.
 846                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 847
 848                 # Check for any __NOINDEX__ tags on the page using $pOutput
 849                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 850                 $outputPage->setIndexPolicy( $policy['index'] );
 851                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 852
 853                 $this->showViewFooter();
 854                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 855
 856                 # Load the postEdit module if the user just saved this revision
 857                 # See also EditPage::setPostEditCookie
 858                 $request = $this->getContext()->getRequest();
 859                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 860                 $postEdit = $request->getCookie( $cookieKey );
 861                 if ( $postEdit ) {
 862                         # Clear the cookie. This also prevents caching of the response.
 863                         $request->response()->clearCookie( $cookieKey );
 864                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 865                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 866                 }
 867         }
 868
 869         /**
 870          * @param RevisionRecord $revision
 871          * @return null|Title
 872          */
 873         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 874                 // TODO: find a *good* place for the code that determines the redirect target for
 875                 // a given revision!
 876                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 877                 $content = $revision->getContent( SlotRecord::MAIN );
 878                 return $content ? $content->getRedirectTarget() : null;
 879         }
 880
 881         /**
 882          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 883          * @param ParserOutput $pOutput
 884          */
 885         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 886                 $out = $this->getContext()->getOutput();
 887
 888                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 889                 $titleText = $pOutput->getTitleText();
 890                 if ( strval( $titleText ) !== '' ) {
 891                         $out->setPageTitle( $titleText );
 892                         $out->setDisplayTitle( $titleText );
 893                 }
 894         }
 895
 896         /**
 897          * Show a diff page according to current request variables. For use within
 898          * Article::view() only, other callers should use the DifferenceEngine class.
 899          */
 900         protected function showDiffPage() {
 901                 $request = $this->getContext()->getRequest();
 902                 $user = $this->getContext()->getUser();
 903                 $diff = $request->getVal( 'diff' );
 904                 $rcid = $request->getVal( 'rcid' );
 905                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 906                 $purge = $request->getVal( 'action' ) == 'purge';
 907                 $unhide = $request->getInt( 'unhide' ) == 1;
 908                 $oldid = $this->getOldID();
 909
 910                 $rev = $this->getRevisionFetched();
 911
 912                 if ( !$rev ) {
 913                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 914                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 915                                 ->params( $oldid )
 916                                 ->numParams( 1 )
 917                                 ->parseAsBlock();
 918                         $this->getContext()->getOutput()->addHTML( $msg );
 919                         return;
 920                 }
 921
 922                 $contentHandler = $rev->getContentHandler();
 923                 $de = $contentHandler->createDifferenceEngine(
 924                         $this->getContext(),
 925                         $oldid,
 926                         $diff,
 927                         $rcid,
 928                         $purge,
 929                         $unhide
 930                 );
 931
 932                 // DifferenceEngine directly fetched the revision:
 933                 $this->mRevIdFetched = $de->getNewid();
 934                 $de->showDiffPage( $diffOnly );
 935
 936                 // Run view updates for the newer revision being diffed (and shown
 937                 // below the diff if not $diffOnly).
 938                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 939                 // New can be false, convert it to 0 - this conveniently means the latest revision
 940                 $this->mPage->doViewUpdates( $user, (int)$new );
 941         }
 942
 943         /**
 944          * Get the robot policy to be used for the current view
 945          * @param string $action The action= GET parameter
 946          * @param ParserOutput|null $pOutput
 947          * @return array The policy that should be set
 948          * @todo actions other than 'view'
 949          */
 950         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 951                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 952
 953                 $ns = $this->getTitle()->getNamespace();
 954
 955                 # Don't index user and user talk pages for blocked users (T13443)
 956                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 957                         $specificTarget = null;
 958                         $vagueTarget = null;
 959                         $titleText = $this->getTitle()->getText();
 960                         if ( IP::isValid( $titleText ) ) {
 961                                 $vagueTarget = $titleText;
 962                         } else {
 963                                 $specificTarget = $titleText;
 964                         }
 965                         if ( DatabaseBlock::newFromTarget( $specificTarget, $vagueTarget ) instanceof DatabaseBlock ) {
 966                                 return [
 967                                         'index' => 'noindex',
 968                                         'follow' => 'nofollow'
 969                                 ];
 970                         }
 971                 }
 972
 973                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 974                         # Non-articles (special pages etc), and old revisions
 975                         return [
 976                                 'index' => 'noindex',
 977                                 'follow' => 'nofollow'
 978                         ];
 979                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 980                         # Discourage indexing of printable versions, but encourage following
 981                         return [
 982                                 'index' => 'noindex',
 983                                 'follow' => 'follow'
 984                         ];
 985                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 986                         # For ?curid=x urls, disallow indexing
 987                         return [
 988                                 'index' => 'noindex',
 989                                 'follow' => 'follow'
 990                         ];
 991                 }
 992
 993                 # Otherwise, construct the policy based on the various config variables.
 994                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 995
 996                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 997                         # Honour customised robot policies for this namespace
 998                         $policy = array_merge(
 999                                 $policy,
1000                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1001                         );
1002                 }
1003                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1004                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1005                         # a final sanity check that we have really got the parser output.
1006                         $policy = array_merge(
1007                                 $policy,
1008                                 [ 'index' => $pOutput->getIndexPolicy() ]
1009                         );
1010                 }
1011
1012                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1013                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1014                         $policy = array_merge(
1015                                 $policy,
1016                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1017                         );
1018                 }
1019
1020                 return $policy;
1021         }
1022
1023         /**
1024          * Converts a String robot policy into an associative array, to allow
1025          * merging of several policies using array_merge().
1026          * @param array|string $policy Returns empty array on null/false/'', transparent
1027          *   to already-converted arrays, converts string.
1028          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1029          */
1030         public static function formatRobotPolicy( $policy ) {
1031                 if ( is_array( $policy ) ) {
1032                         return $policy;
1033                 } elseif ( !$policy ) {
1034                         return [];
1035                 }
1036
1037                 $policy = explode( ',', $policy );
1038                 $policy = array_map( 'trim', $policy );
1039
1040                 $arr = [];
1041                 foreach ( $policy as $var ) {
1042                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1043                                 $arr['index'] = $var;
1044                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1045                                 $arr['follow'] = $var;
1046                         }
1047                 }
1048
1049                 return $arr;
1050         }
1051
1052         /**
1053          * If this request is a redirect view, send "redirected from" subtitle to
1054          * the output. Returns true if the header was needed, false if this is not
1055          * a redirect view. Handles both local and remote redirects.
1056          *
1057          * @return bool
1058          */
1059         public function showRedirectedFromHeader() {
1060                 global $wgRedirectSources;
1061
1062                 $context = $this->getContext();
1063                 $outputPage = $context->getOutput();
1064                 $request = $context->getRequest();
1065                 $rdfrom = $request->getVal( 'rdfrom' );
1066
1067                 // Construct a URL for the current page view, but with the target title
1068                 $query = $request->getValues();
1069                 unset( $query['rdfrom'] );
1070                 unset( $query['title'] );
1071                 if ( $this->getTitle()->isRedirect() ) {
1072                         // Prevent double redirects
1073                         $query['redirect'] = 'no';
1074                 }
1075                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1076
1077                 if ( isset( $this->mRedirectedFrom ) ) {
1078                         // Avoid PHP 7.1 warning of passing $this by reference
1079                         $articlePage = $this;
1080
1081                         // This is an internally redirected page view.
1082                         // We'll need a backlink to the source page for navigation.
1083                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1084                                 $redir = Linker::linkKnown(
1085                                         $this->mRedirectedFrom,
1086                                         null,
1087                                         [],
1088                                         [ 'redirect' => 'no' ]
1089                                 );
1090
1091                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1092                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1093                                 . "</span>" );
1094
1095                                 // Add the script to update the displayed URL and
1096                                 // set the fragment if one was specified in the redirect
1097                                 $outputPage->addJsConfigVars( [
1098                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1099                                 ] );
1100                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1101
1102                                 // Add a <link rel="canonical"> tag
1103                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1104
1105                                 // Tell the output object that the user arrived at this article through a redirect
1106                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1107
1108                                 return true;
1109                         }
1110                 } elseif ( $rdfrom ) {
1111                         // This is an externally redirected view, from some other wiki.
1112                         // If it was reported from a trusted site, supply a backlink.
1113                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1114                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1115                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1116                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1117                                 . "</span>" );
1118
1119                                 // Add the script to update the displayed URL
1120                                 $outputPage->addJsConfigVars( [
1121                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1122                                 ] );
1123                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1124
1125                                 return true;
1126                         }
1127                 }
1128
1129                 return false;
1130         }
1131
1132         /**
1133          * Show a header specific to the namespace currently being viewed, like
1134          * [[MediaWiki:Talkpagetext]]. For Article::view().
1135          */
1136         public function showNamespaceHeader() {
1137                 if ( $this->getTitle()->isTalkPage() && !wfMessage( 'talkpageheader' )->isDisabled() ) {
1138                         $this->getContext()->getOutput()->wrapWikiMsg(
1139                                 "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1140                                 [ 'talkpageheader' ]
1141                         );
1142                 }
1143         }
1144
1145         /**
1146          * Show the footer section of an ordinary page view
1147          */
1148         public function showViewFooter() {
1149                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1150                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1151                         && IP::isValid( $this->getTitle()->getText() )
1152                 ) {
1153                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1154                 }
1155
1156                 // Show a footer allowing the user to patrol the shown revision or page if possible
1157                 $patrolFooterShown = $this->showPatrolFooter();
1158
1159                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1160         }
1161
1162         /**
1163          * If patrol is possible, output a patrol UI box. This is called from the
1164          * footer section of ordinary page views. If patrol is not possible or not
1165          * desired, does nothing.
1166          * Side effect: When the patrol link is build, this method will call
1167          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1168          *
1169          * @return bool
1170          */
1171         public function showPatrolFooter() {
1172                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1173
1174                 // Allow hooks to decide whether to not output this at all
1175                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1176                         return false;
1177                 }
1178
1179                 $outputPage = $this->getContext()->getOutput();
1180                 $user = $this->getContext()->getUser();
1181                 $title = $this->getTitle();
1182                 $rc = false;
1183
1184                 if ( !$title->quickUserCan( 'patrol', $user )
1185                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1186                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1187                 ) {
1188                         // Patrolling is disabled or the user isn't allowed to
1189                         return false;
1190                 }
1191
1192                 if ( $this->mRevision
1193                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1194                 ) {
1195                         // The current revision is already older than what could be in the RC table
1196                         // 6h tolerance because the RC might not be cleaned out regularly
1197                         return false;
1198                 }
1199
1200                 // Check for cached results
1201                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1202                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1203                 if ( $cache->get( $key ) ) {
1204                         return false;
1205                 }
1206
1207                 $dbr = wfGetDB( DB_REPLICA );
1208                 $oldestRevisionTimestamp = $dbr->selectField(
1209                         'revision',
1210                         'MIN( rev_timestamp )',
1211                         [ 'rev_page' => $title->getArticleID() ],
1212                         __METHOD__
1213                 );
1214
1215                 // New page patrol: Get the timestamp of the oldest revison which
1216                 // the revision table holds for the given page. Then we look
1217                 // whether it's within the RC lifespan and if it is, we try
1218                 // to get the recentchanges row belonging to that entry
1219                 // (with rc_new = 1).
1220                 $recentPageCreation = false;
1221                 if ( $oldestRevisionTimestamp
1222                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1223                 ) {
1224                         // 6h tolerance because the RC might not be cleaned out regularly
1225                         $recentPageCreation = true;
1226                         $rc = RecentChange::newFromConds(
1227                                 [
1228                                         'rc_new' => 1,
1229                                         'rc_timestamp' => $oldestRevisionTimestamp,
1230                                         'rc_namespace' => $title->getNamespace(),
1231                                         'rc_cur_id' => $title->getArticleID()
1232                                 ],
1233                                 __METHOD__
1234                         );
1235                         if ( $rc ) {
1236                                 // Use generic patrol message for new pages
1237                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1238                         }
1239                 }
1240
1241                 // File patrol: Get the timestamp of the latest upload for this page,
1242                 // check whether it is within the RC lifespan and if it is, we try
1243                 // to get the recentchanges row belonging to that entry
1244                 // (with rc_type = RC_LOG, rc_log_type = upload).
1245                 $recentFileUpload = false;
1246                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1247                         && $title->getNamespace() === NS_FILE ) {
1248                         // Retrieve timestamp of most recent upload
1249                         $newestUploadTimestamp = $dbr->selectField(
1250                                 'image',
1251                                 'MAX( img_timestamp )',
1252                                 [ 'img_name' => $title->getDBkey() ],
1253                                 __METHOD__
1254                         );
1255                         if ( $newestUploadTimestamp
1256                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1257                         ) {
1258                                 // 6h tolerance because the RC might not be cleaned out regularly
1259                                 $recentFileUpload = true;
1260                                 $rc = RecentChange::newFromConds(
1261                                         [
1262                                                 'rc_type' => RC_LOG,
1263                                                 'rc_log_type' => 'upload',
1264                                                 'rc_timestamp' => $newestUploadTimestamp,
1265                                                 'rc_namespace' => NS_FILE,
1266                                                 'rc_cur_id' => $title->getArticleID()
1267                                         ],
1268                                         __METHOD__
1269                                 );
1270                                 if ( $rc ) {
1271                                         // Use patrol message specific to files
1272                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1273                                 }
1274                         }
1275                 }
1276
1277                 if ( !$recentPageCreation && !$recentFileUpload ) {
1278                         // Page creation and latest upload (for files) is too old to be in RC
1279
1280                         // We definitely can't patrol so cache the information
1281                         // When a new file version is uploaded, the cache is cleared
1282                         $cache->set( $key, '1' );
1283
1284                         return false;
1285                 }
1286
1287                 if ( !$rc ) {
1288                         // Don't cache: This can be hit if the page gets accessed very fast after
1289                         // its creation / latest upload or in case we have high replica DB lag. In case
1290                         // the revision is too old, we will already return above.
1291                         return false;
1292                 }
1293
1294                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1295                         // Patrolled RC entry around
1296
1297                         // Cache the information we gathered above in case we can't patrol
1298                         // Don't cache in case we can patrol as this could change
1299                         $cache->set( $key, '1' );
1300
1301                         return false;
1302                 }
1303
1304                 if ( $rc->getPerformer()->equals( $user ) ) {
1305                         // Don't show a patrol link for own creations/uploads. If the user could
1306                         // patrol them, they already would be patrolled
1307                         return false;
1308                 }
1309
1310                 $outputPage->preventClickjacking();
1311                 if ( $user->isAllowed( 'writeapi' ) ) {
1312                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1313                 }
1314
1315                 $link = Linker::linkKnown(
1316                         $title,
1317                         $markPatrolledMsg->escaped(),
1318                         [],
1319                         [
1320                                 'action' => 'markpatrolled',
1321                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1322                         ]
1323                 );
1324
1325                 $outputPage->addHTML(
1326                         "<div class='patrollink' data-mw='interface'>" .
1327                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1328                         '</div>'
1329                 );
1330
1331                 return true;
1332         }
1333
1334         /**
1335          * Purge the cache used to check if it is worth showing the patrol footer
1336          * For example, it is done during re-uploads when file patrol is used.
1337          * @param int $articleID ID of the article to purge
1338          * @since 1.27
1339          */
1340         public static function purgePatrolFooterCache( $articleID ) {
1341                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1342                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1343         }
1344
1345         /**
1346          * Show the error text for a missing article. For articles in the MediaWiki
1347          * namespace, show the default message text. To be called from Article::view().
1348          */
1349         public function showMissingArticle() {
1350                 global $wgSend404Code;
1351
1352                 $outputPage = $this->getContext()->getOutput();
1353                 // Whether the page is a root user page of an existing user (but not a subpage)
1354                 $validUserPage = false;
1355
1356                 $title = $this->getTitle();
1357
1358                 $services = MediaWikiServices::getInstance();
1359
1360                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1361                 if ( $title->getNamespace() == NS_USER
1362                         || $title->getNamespace() == NS_USER_TALK
1363                 ) {
1364                         $rootPart = explode( '/', $title->getText() )[0];
1365                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1366                         $ip = User::isIP( $rootPart );
1367                         $block = DatabaseBlock::newFromTarget( $user, $user );
1368
1369                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1370                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1371                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1372                         } elseif (
1373                                 !is_null( $block ) &&
1374                                 $block->getType() != DatabaseBlock::TYPE_AUTO &&
1375                                 ( $block->isSitewide() || $user->isBlockedFrom( $title ) )
1376                         ) {
1377                                 // Show log extract if the user is sitewide blocked or is partially
1378                                 // blocked and not allowed to edit their user page or user talk page
1379                                 LogEventsList::showLogExtract(
1380                                         $outputPage,
1381                                         'block',
1382                                         $services->getNamespaceInfo()->getCanonicalName( NS_USER ) . ':' .
1383                                                 $block->getTarget(),
1384                                         '',
1385                                         [
1386                                                 'lim' => 1,
1387                                                 'showIfEmpty' => false,
1388                                                 'msgKey' => [
1389                                                         'blocked-notice-logextract',
1390                                                         $user->getName() # Support GENDER in notice
1391                                                 ]
1392                                         ]
1393                                 );
1394                                 $validUserPage = !$title->isSubpage();
1395                         } else {
1396                                 $validUserPage = !$title->isSubpage();
1397                         }
1398                 }
1399
1400                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1401
1402                 # Show delete and move logs if there were any such events.
1403                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1404                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1405                 $dbCache = ObjectCache::getInstance( 'db-replicated' );
1406                 $key = $dbCache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1407                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1408                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1409                 if ( $loggedIn || $dbCache->get( $key ) || $sessionExists ) {
1410                         $logTypes = [ 'delete', 'move', 'protect' ];
1411
1412                         $dbr = wfGetDB( DB_REPLICA );
1413
1414                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1415                         // Give extensions a chance to hide their (unrelated) log entries
1416                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1417                         LogEventsList::showLogExtract(
1418                                 $outputPage,
1419                                 $logTypes,
1420                                 $title,
1421                                 '',
1422                                 [
1423                                         'lim' => 10,
1424                                         'conds' => $conds,
1425                                         'showIfEmpty' => false,
1426                                         'msgKey' => [ $loggedIn || $sessionExists
1427                                                 ? 'moveddeleted-notice'
1428                                                 : 'moveddeleted-notice-recent'
1429                                         ]
1430                                 ]
1431                         );
1432                 }
1433
1434                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1435                         // If there's no backing content, send a 404 Not Found
1436                         // for better machine handling of broken links.
1437                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1438                 }
1439
1440                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1441                 $policy = $this->getRobotPolicy( 'view' );
1442                 $outputPage->setIndexPolicy( $policy['index'] );
1443                 $outputPage->setFollowPolicy( $policy['follow'] );
1444
1445                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1446
1447                 if ( !$hookResult ) {
1448                         return;
1449                 }
1450
1451                 # Show error message
1452                 $oldid = $this->getOldID();
1453                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1454                         // use fake Content object for system message
1455                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1456                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1457                 } else {
1458                         if ( $oldid ) {
1459                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1460                         } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1461                                 && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1462                         ) {
1463                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1464                                 $text = wfMessage( $message )->plain();
1465                         } else {
1466                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1467                         }
1468
1469                         $dir = $this->getContext()->getLanguage()->getDir();
1470                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1471                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1472                                 'class' => "noarticletext mw-content-$dir",
1473                                 'dir' => $dir,
1474                                 'lang' => $lang,
1475                         ] ) . "\n$text\n</div>" );
1476                 }
1477         }
1478
1479         /**
1480          * If the revision requested for view is deleted, check permissions.
1481          * Send either an error message or a warning header to the output.
1482          *
1483          * @return bool True if the view is allowed, false if not.
1484          */
1485         public function showDeletedRevisionHeader() {
1486                 if ( !$this->mRevision->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
1487                         // Not deleted
1488                         return true;
1489                 }
1490
1491                 $outputPage = $this->getContext()->getOutput();
1492                 $user = $this->getContext()->getUser();
1493                 // If the user is not allowed to see it...
1494                 if ( !$this->mRevision->userCan( RevisionRecord::DELETED_TEXT, $user ) ) {
1495                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1496                                 'rev-deleted-text-permission' );
1497
1498                         return false;
1499                 // If the user needs to confirm that they want to see it...
1500                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1501                         # Give explanation and add a link to view the revision...
1502                         $oldid = intval( $this->getOldID() );
1503                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1504                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1505                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1506                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1507                                 [ $msg, $link ] );
1508
1509                         return false;
1510                 // We are allowed to see...
1511                 } else {
1512                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1513                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1514                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1515
1516                         return true;
1517                 }
1518         }
1519
1520         /**
1521          * Generate the navigation links when browsing through an article revisions
1522          * It shows the information as:
1523          *   Revision as of \<date\>; view current revision
1524          *   \<- Previous version | Next Version -\>
1525          *
1526          * @param int $oldid Revision ID of this article revision
1527          */
1528         public function setOldSubtitle( $oldid = 0 ) {
1529                 // Avoid PHP 7.1 warning of passing $this by reference
1530                 $articlePage = $this;
1531
1532                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1533                         return;
1534                 }
1535
1536                 $context = $this->getContext();
1537                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1538
1539                 # Cascade unhide param in links for easy deletion browsing
1540                 $extraParams = [];
1541                 if ( $unhide ) {
1542                         $extraParams['unhide'] = 1;
1543                 }
1544
1545                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1546                         $revision = $this->mRevision;
1547                 } else {
1548                         $revision = Revision::newFromId( $oldid );
1549                 }
1550
1551                 $timestamp = $revision->getTimestamp();
1552
1553                 $current = ( $oldid == $this->mPage->getLatest() );
1554                 $language = $context->getLanguage();
1555                 $user = $context->getUser();
1556
1557                 $td = $language->userTimeAndDate( $timestamp, $user );
1558                 $tddate = $language->userDate( $timestamp, $user );
1559                 $tdtime = $language->userTime( $timestamp, $user );
1560
1561                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1562                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1563
1564                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1565                         ? 'revision-info-current'
1566                         : 'revision-info';
1567
1568                 $outputPage = $context->getOutput();
1569                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1570                         $context->msg( $infomsg, $td )
1571                                 ->rawParams( $userlinks )
1572                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1573                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1574                                 ->parse() .
1575                         "</div>";
1576
1577                 $lnk = $current
1578                         ? $context->msg( 'currentrevisionlink' )->escaped()
1579                         : Linker::linkKnown(
1580                                 $this->getTitle(),
1581                                 $context->msg( 'currentrevisionlink' )->escaped(),
1582                                 [],
1583                                 $extraParams
1584                         );
1585                 $curdiff = $current
1586                         ? $context->msg( 'diff' )->escaped()
1587                         : Linker::linkKnown(
1588                                 $this->getTitle(),
1589                                 $context->msg( 'diff' )->escaped(),
1590                                 [],
1591                                 [
1592                                         'diff' => 'cur',
1593                                         'oldid' => $oldid
1594                                 ] + $extraParams
1595                         );
1596                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1597                 $prevlink = $prev
1598                         ? Linker::linkKnown(
1599                                 $this->getTitle(),
1600                                 $context->msg( 'previousrevision' )->escaped(),
1601                                 [],
1602                                 [
1603                                         'direction' => 'prev',
1604                                         'oldid' => $oldid
1605                                 ] + $extraParams
1606                         )
1607                         : $context->msg( 'previousrevision' )->escaped();
1608                 $prevdiff = $prev
1609                         ? Linker::linkKnown(
1610                                 $this->getTitle(),
1611                                 $context->msg( 'diff' )->escaped(),
1612                                 [],
1613                                 [
1614                                         'diff' => 'prev',
1615                                         'oldid' => $oldid
1616                                 ] + $extraParams
1617                         )
1618                         : $context->msg( 'diff' )->escaped();
1619                 $nextlink = $current
1620                         ? $context->msg( 'nextrevision' )->escaped()
1621                         : Linker::linkKnown(
1622                                 $this->getTitle(),
1623                                 $context->msg( 'nextrevision' )->escaped(),
1624                                 [],
1625                                 [
1626                                         'direction' => 'next',
1627                                         'oldid' => $oldid
1628                                 ] + $extraParams
1629                         );
1630                 $nextdiff = $current
1631                         ? $context->msg( 'diff' )->escaped()
1632                         : Linker::linkKnown(
1633                                 $this->getTitle(),
1634                                 $context->msg( 'diff' )->escaped(),
1635                                 [],
1636                                 [
1637                                         'diff' => 'next',
1638                                         'oldid' => $oldid
1639                                 ] + $extraParams
1640                         );
1641
1642                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1643                 if ( $cdel !== '' ) {
1644                         $cdel .= ' ';
1645                 }
1646
1647                 // the outer div is need for styling the revision info and nav in MobileFrontend
1648                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1649                         "<div id=\"mw-revision-nav\">" . $cdel .
1650                         $context->msg( 'revision-nav' )->rawParams(
1651                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1652                         )->escaped() . "</div></div>" );
1653         }
1654
1655         /**
1656          * Return the HTML for the top of a redirect page
1657          *
1658          * Chances are you should just be using the ParserOutput from
1659          * WikitextContent::getParserOutput instead of calling this for redirects.
1660          *
1661          * @param Title|array $target Destination(s) to redirect
1662          * @param bool $appendSubtitle [optional]
1663          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1664          * @return string Containing HTML with redirect link
1665          *
1666          * @deprecated since 1.30
1667          */
1668         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1669                 $lang = $this->getTitle()->getPageLanguage();
1670                 $out = $this->getContext()->getOutput();
1671                 if ( $appendSubtitle ) {
1672                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1673                 }
1674                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1675                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1676         }
1677
1678         /**
1679          * Return the HTML for the top of a redirect page
1680          *
1681          * Chances are you should just be using the ParserOutput from
1682          * WikitextContent::getParserOutput instead of calling this for redirects.
1683          *
1684          * @since 1.23
1685          * @param Language $lang
1686          * @param Title|array $target Destination(s) to redirect
1687          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1688          * @return string Containing HTML with redirect link
1689          */
1690         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1691                 if ( !is_array( $target ) ) {
1692                         $target = [ $target ];
1693                 }
1694
1695                 $html = '<ul class="redirectText">';
1696                 /** @var Title $title */
1697                 foreach ( $target as $title ) {
1698                         $html .= '<li>' . Linker::link(
1699                                 $title,
1700                                 htmlspecialchars( $title->getFullText() ),
1701                                 [],
1702                                 // Make sure wiki page redirects are not followed
1703                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1704                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1705                         ) . '</li>';
1706                 }
1707                 $html .= '</ul>';
1708
1709                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1710
1711                 return '<div class="redirectMsg">' .
1712                         '<p>' . $redirectToText . '</p>' .
1713                         $html .
1714                         '</div>';
1715         }
1716
1717         /**
1718          * Adds help link with an icon via page indicators.
1719          * Link target can be overridden by a local message containing a wikilink:
1720          * the message key is: 'namespace-' + namespace number + '-helppage'.
1721          * @param string $to Target MediaWiki.org page title or encoded URL.
1722          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1723          * @since 1.25
1724          */
1725         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1726                 $msg = wfMessage(
1727                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1728                 );
1729
1730                 $out = $this->getContext()->getOutput();
1731                 if ( !$msg->isDisabled() ) {
1732                         $helpUrl = Skin::makeUrl( $msg->plain() );
1733                         $out->addHelpLink( $helpUrl, true );
1734                 } else {
1735                         $out->addHelpLink( $to, $overrideBaseUrl );
1736                 }
1737         }
1738
1739         /**
1740          * Handle action=render
1741          */
1742         public function render() {
1743                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1744                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1745                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1746                 $this->viewIsRenderAction = true;
1747                 $this->view();
1748         }
1749
1750         /**
1751          * action=protect handler
1752          */
1753         public function protect() {
1754                 $form = new ProtectionForm( $this );
1755                 $form->execute();
1756         }
1757
1758         /**
1759          * action=unprotect handler (alias)
1760          */
1761         public function unprotect() {
1762                 $this->protect();
1763         }
1764
1765         /**
1766          * UI entry point for page deletion
1767          */
1768         public function delete() {
1769                 # This code desperately needs to be totally rewritten
1770
1771                 $title = $this->getTitle();
1772                 $context = $this->getContext();
1773                 $user = $context->getUser();
1774                 $request = $context->getRequest();
1775
1776                 # Check permissions
1777                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1778                 if ( count( $permissionErrors ) ) {
1779                         throw new PermissionsError( 'delete', $permissionErrors );
1780                 }
1781
1782                 # Read-only check...
1783                 if ( wfReadOnly() ) {
1784                         throw new ReadOnlyError;
1785                 }
1786
1787                 # Better double-check that it hasn't been deleted yet!
1788                 $this->mPage->loadPageData(
1789                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1790                 );
1791                 if ( !$this->mPage->exists() ) {
1792                         $deleteLogPage = new LogPage( 'delete' );
1793                         $outputPage = $context->getOutput();
1794                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1795                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1796                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1797                                 );
1798                         $outputPage->addHTML(
1799                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1800                         );
1801                         LogEventsList::showLogExtract(
1802                                 $outputPage,
1803                                 'delete',
1804                                 $title
1805                         );
1806
1807                         return;
1808                 }
1809
1810                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1811                 $deleteReason = $request->getText( 'wpReason' );
1812
1813                 if ( $deleteReasonList == 'other' ) {
1814                         $reason = $deleteReason;
1815                 } elseif ( $deleteReason != '' ) {
1816                         // Entry from drop down menu + additional comment
1817                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1818                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1819                 } else {
1820                         $reason = $deleteReasonList;
1821                 }
1822
1823                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1824                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1825                 ) {
1826                         # Flag to hide all contents of the archived revisions
1827                         $suppress = $request->getCheck( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1828
1829                         $this->doDelete( $reason, $suppress );
1830
1831                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1832
1833                         return;
1834                 }
1835
1836                 // Generate deletion reason
1837                 $hasHistory = false;
1838                 if ( !$reason ) {
1839                         try {
1840                                 $reason = $this->generateReason( $hasHistory );
1841                         } catch ( Exception $e ) {
1842                                 # if a page is horribly broken, we still want to be able to
1843                                 # delete it. So be lenient about errors here.
1844                                 wfDebug( "Error while building auto delete summary: $e" );
1845                                 $reason = '';
1846                         }
1847                 }
1848
1849                 // If the page has a history, insert a warning
1850                 if ( $hasHistory ) {
1851                         $title = $this->getTitle();
1852
1853                         // The following can use the real revision count as this is only being shown for users
1854                         // that can delete this page.
1855                         // This, as a side-effect, also makes sure that the following query isn't being run for
1856                         // pages with a larger history, unless the user has the 'bigdelete' right
1857                         // (and is about to delete this page).
1858                         $dbr = wfGetDB( DB_REPLICA );
1859                         $revisions = $edits = (int)$dbr->selectField(
1860                                 'revision',
1861                                 'COUNT(rev_page)',
1862                                 [ 'rev_page' => $title->getArticleID() ],
1863                                 __METHOD__
1864                         );
1865
1866                         // @todo i18n issue/patchwork message
1867                         $context->getOutput()->addHTML(
1868                                 '<strong class="mw-delete-warning-revisions">' .
1869                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1870                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1871                                         $context->msg( 'history' )->escaped(),
1872                                         [],
1873                                         [ 'action' => 'history' ] ) .
1874                                 '</strong>'
1875                         );
1876
1877                         if ( $title->isBigDeletion() ) {
1878                                 global $wgDeleteRevisionsLimit;
1879                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1880                                         [
1881                                                 'delete-warning-toobig',
1882                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1883                                         ]
1884                                 );
1885                         }
1886                 }
1887
1888                 $this->confirmDelete( $reason );
1889         }
1890
1891         /**
1892          * Output deletion confirmation dialog
1893          * @todo Move to another file?
1894          * @param string $reason Prefilled reason
1895          */
1896         public function confirmDelete( $reason ) {
1897                 wfDebug( "Article::confirmDelete\n" );
1898
1899                 $title = $this->getTitle();
1900                 $ctx = $this->getContext();
1901                 $outputPage = $ctx->getOutput();
1902                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1903                 $outputPage->addBacklinkSubtitle( $title );
1904                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1905                 $outputPage->addModules( 'mediawiki.action.delete' );
1906
1907                 $backlinkCache = $title->getBacklinkCache();
1908                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1909                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1910                                 'deleting-backlinks-warning' );
1911                 }
1912
1913                 $subpageQueryLimit = 51;
1914                 $subpages = $title->getSubpages( $subpageQueryLimit );
1915                 $subpageCount = count( $subpages );
1916                 if ( $subpageCount > 0 ) {
1917                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1918                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1919                 }
1920                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1921
1922                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1923
1924                 $user = $this->getContext()->getUser();
1925                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1926
1927                 $outputPage->enableOOUI();
1928
1929                 $options = Xml::listDropDownOptions(
1930                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1931                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1932                 );
1933                 $options = Xml::listDropDownOptionsOoui( $options );
1934
1935                 $fields[] = new OOUI\FieldLayout(
1936                         new OOUI\DropdownInputWidget( [
1937                                 'name' => 'wpDeleteReasonList',
1938                                 'inputId' => 'wpDeleteReasonList',
1939                                 'tabIndex' => 1,
1940                                 'infusable' => true,
1941                                 'value' => '',
1942                                 'options' => $options
1943                         ] ),
1944                         [
1945                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1946                                 'align' => 'top',
1947                         ]
1948                 );
1949
1950                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1951                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1952                 // Unicode codepoints.
1953                 $fields[] = new OOUI\FieldLayout(
1954                         new OOUI\TextInputWidget( [
1955                                 'name' => 'wpReason',
1956                                 'inputId' => 'wpReason',
1957                                 'tabIndex' => 2,
1958                                 'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
1959                                 'infusable' => true,
1960                                 'value' => $reason,
1961                                 'autofocus' => true,
1962                         ] ),
1963                         [
1964                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1965                                 'align' => 'top',
1966                         ]
1967                 );
1968
1969                 if ( $user->isLoggedIn() ) {
1970                         $fields[] = new OOUI\FieldLayout(
1971                                 new OOUI\CheckboxInputWidget( [
1972                                         'name' => 'wpWatch',
1973                                         'inputId' => 'wpWatch',
1974                                         'tabIndex' => 3,
1975                                         'selected' => $checkWatch,
1976                                 ] ),
1977                                 [
1978                                         'label' => $ctx->msg( 'watchthis' )->text(),
1979                                         'align' => 'inline',
1980                                         'infusable' => true,
1981                                 ]
1982                         );
1983                 }
1984
1985                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1986                         $fields[] = new OOUI\FieldLayout(
1987                                 new OOUI\CheckboxInputWidget( [
1988                                         'name' => 'wpSuppress',
1989                                         'inputId' => 'wpSuppress',
1990                                         'tabIndex' => 4,
1991                                 ] ),
1992                                 [
1993                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
1994                                         'align' => 'inline',
1995                                         'infusable' => true,
1996                                 ]
1997                         );
1998                 }
1999
2000                 $fields[] = new OOUI\FieldLayout(
2001                         new OOUI\ButtonInputWidget( [
2002                                 'name' => 'wpConfirmB',
2003                                 'inputId' => 'wpConfirmB',
2004                                 'tabIndex' => 5,
2005                                 'value' => $ctx->msg( 'deletepage' )->text(),
2006                                 'label' => $ctx->msg( 'deletepage' )->text(),
2007                                 'flags' => [ 'primary', 'destructive' ],
2008                                 'type' => 'submit',
2009                         ] ),
2010                         [
2011                                 'align' => 'top',
2012                         ]
2013                 );
2014
2015                 $fieldset = new OOUI\FieldsetLayout( [
2016                         'label' => $ctx->msg( 'delete-legend' )->text(),
2017                         'id' => 'mw-delete-table',
2018                         'items' => $fields,
2019                 ] );
2020
2021                 $form = new OOUI\FormLayout( [
2022                         'method' => 'post',
2023                         'action' => $title->getLocalURL( 'action=delete' ),
2024                         'id' => 'deleteconfirm',
2025                 ] );
2026                 $form->appendContent(
2027                         $fieldset,
2028                         new OOUI\HtmlSnippet(
2029                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2030                         )
2031                 );
2032
2033                 $outputPage->addHTML(
2034                         new OOUI\PanelLayout( [
2035                                 'classes' => [ 'deletepage-wrapper' ],
2036                                 'expanded' => false,
2037                                 'padded' => true,
2038                                 'framed' => true,
2039                                 'content' => $form,
2040                         ] )
2041                 );
2042
2043                 if ( $user->isAllowed( 'editinterface' ) ) {
2044                         $link = Linker::linkKnown(
2045                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2046                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2047                                 [],
2048                                 [ 'action' => 'edit' ]
2049                         );
2050                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2051                 }
2052
2053                 $deleteLogPage = new LogPage( 'delete' );
2054                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2055                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2056         }
2057
2058         /**
2059          * Perform a deletion and output success or failure messages
2060          * @param string $reason
2061          * @param bool $suppress
2062          * @param bool $immediate false allows deleting over time via the job queue
2063          * @throws FatalError
2064          * @throws MWException
2065          */
2066         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2067                 $error = '';
2068                 $context = $this->getContext();
2069                 $outputPage = $context->getOutput();
2070                 $user = $context->getUser();
2071                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2072                         [], 'delete', $immediate );
2073
2074                 if ( $status->isOK() ) {
2075                         $deleted = $this->getTitle()->getPrefixedText();
2076
2077                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2078                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2079
2080                         if ( $status->isGood() ) {
2081                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2082                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2083                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2084                         } else {
2085                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2086                         }
2087
2088                         $outputPage->returnToMain( false );
2089                 } else {
2090                         $outputPage->setPageTitle(
2091                                 wfMessage( 'cannotdelete-title',
2092                                         $this->getTitle()->getPrefixedText() )
2093                         );
2094
2095                         if ( $error == '' ) {
2096                                 $outputPage->wrapWikiTextAsInterface(
2097                                         'error mw-error-cannotdelete',
2098                                         $status->getWikiText()
2099                                 );
2100                                 $deleteLogPage = new LogPage( 'delete' );
2101                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2102
2103                                 LogEventsList::showLogExtract(
2104                                         $outputPage,
2105                                         'delete',
2106                                         $this->getTitle()
2107                                 );
2108                         } else {
2109                                 $outputPage->addHTML( $error );
2110                         }
2111                 }
2112         }
2113
2114         /* Caching functions */
2115
2116         /**
2117          * checkLastModified returns true if it has taken care of all
2118          * output to the client that is necessary for this request.
2119          * (that is, it has sent a cached version of the page)
2120          *
2121          * @return bool True if cached version send, false otherwise
2122          */
2123         protected function tryFileCache() {
2124                 static $called = false;
2125
2126                 if ( $called ) {
2127                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2128                         return false;
2129                 }
2130
2131                 $called = true;
2132                 if ( $this->isFileCacheable() ) {
2133                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2134                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2135                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2136                                 $cache->loadFromFileCache( $this->getContext() );
2137                                 return true;
2138                         } else {
2139                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2140                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2141                         }
2142                 } else {
2143                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2144                 }
2145
2146                 return false;
2147         }
2148
2149         /**
2150          * Check if the page can be cached
2151          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2152          * @return bool
2153          */
2154         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2155                 $cacheable = false;
2156
2157                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2158                         $cacheable = $this->mPage->getId()
2159                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2160                         // Extension may have reason to disable file caching on some pages.
2161                         if ( $cacheable ) {
2162                                 // Avoid PHP 7.1 warning of passing $this by reference
2163                                 $articlePage = $this;
2164                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2165                         }
2166                 }
2167
2168                 return $cacheable;
2169         }
2170
2171         /**#@-*/
2172
2173         /**
2174          * Lightweight method to get the parser output for a page, checking the parser cache
2175          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2176          * consider, so it's not appropriate to use there.
2177          *
2178          * @since 1.16 (r52326) for LiquidThreads
2179          *
2180          * @param int|null $oldid Revision ID or null
2181          * @param User|null $user The relevant user
2182          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2183          */
2184         public function getParserOutput( $oldid = null, User $user = null ) {
2185                 // XXX: bypasses mParserOptions and thus setParserOptions()
2186
2187                 if ( $user === null ) {
2188                         $parserOptions = $this->getParserOptions();
2189                 } else {
2190                         $parserOptions = $this->mPage->makeParserOptions( $user );
2191                 }
2192
2193                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2194         }
2195
2196         /**
2197          * Override the ParserOptions used to render the primary article wikitext.
2198          *
2199          * @param ParserOptions $options
2200          * @throws MWException If the parser options where already initialized.
2201          */
2202         public function setParserOptions( ParserOptions $options ) {
2203                 if ( $this->mParserOptions ) {
2204                         throw new MWException( "can't change parser options after they have already been set" );
2205                 }
2206
2207                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2208                 $this->mParserOptions = clone $options;
2209         }
2210
2211         /**
2212          * Get parser options suitable for rendering the primary article wikitext
2213          * @return ParserOptions
2214          */
2215         public function getParserOptions() {
2216                 if ( !$this->mParserOptions ) {
2217                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2218                 }
2219                 // Clone to allow modifications of the return value without affecting cache
2220                 return clone $this->mParserOptions;
2221         }
2222
2223         /**
2224          * Sets the context this Article is executed in
2225          *
2226          * @param IContextSource $context
2227          * @since 1.18
2228          */
2229         public function setContext( $context ) {
2230                 $this->mContext = $context;
2231         }
2232
2233         /**
2234          * Gets the context this Article is executed in
2235          *
2236          * @return IContextSource
2237          * @since 1.18
2238          */
2239         public function getContext() {
2240                 if ( $this->mContext instanceof IContextSource ) {
2241                         return $this->mContext;
2242                 } else {
2243                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2244                                 "Return RequestContext::getMain(); for sanity\n" );
2245                         return RequestContext::getMain();
2246                 }
2247         }
2248
2249         /**
2250          * Use PHP's magic __get handler to handle accessing of
2251          * raw WikiPage fields for backwards compatibility.
2252          *
2253          * @param string $fname Field name
2254          * @return mixed
2255          */
2256         public function __get( $fname ) {
2257                 if ( property_exists( $this->mPage, $fname ) ) {
2258                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2259                         return $this->mPage->$fname;
2260                 }
2261                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2262         }
2263
2264         /**
2265          * Use PHP's magic __set handler to handle setting of
2266          * raw WikiPage fields for backwards compatibility.
2267          *
2268          * @param string $fname Field name
2269          * @param mixed $fvalue New value
2270          */
2271         public function __set( $fname, $fvalue ) {
2272                 if ( property_exists( $this->mPage, $fname ) ) {
2273                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2274                         $this->mPage->$fname = $fvalue;
2275                 // Note: extensions may want to toss on new fields
2276                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2277                         $this->mPage->$fname = $fvalue;
2278                 } else {
2279                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2280                 }
2281         }
2282
2283         /**
2284          * Call to WikiPage function for backwards compatibility.
2285          * @see WikiPage::checkFlags
2286          */
2287         public function checkFlags( $flags ) {
2288                 return $this->mPage->checkFlags( $flags );
2289         }
2290
2291         /**
2292          * Call to WikiPage function for backwards compatibility.
2293          * @see WikiPage::checkTouched
2294          */
2295         public function checkTouched() {
2296                 return $this->mPage->checkTouched();
2297         }
2298
2299         /**
2300          * Call to WikiPage function for backwards compatibility.
2301          * @see WikiPage::clearPreparedEdit
2302          */
2303         public function clearPreparedEdit() {
2304                 $this->mPage->clearPreparedEdit();
2305         }
2306
2307         /**
2308          * Call to WikiPage function for backwards compatibility.
2309          * @see WikiPage::doDeleteArticleReal
2310          */
2311         public function doDeleteArticleReal(
2312                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2313                 $tags = [], $immediate = false
2314         ) {
2315                 return $this->mPage->doDeleteArticleReal(
2316                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2317                 );
2318         }
2319
2320         /**
2321          * Call to WikiPage function for backwards compatibility.
2322          * @see WikiPage::doDeleteUpdates
2323          */
2324         public function doDeleteUpdates(
2325                 $id,
2326                 Content $content = null,
2327                 $revision = null,
2328                 User $user = null
2329         ) {
2330                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2331         }
2332
2333         /**
2334          * Call to WikiPage function for backwards compatibility.
2335          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2336          * @see WikiPage::doEditContent
2337          */
2338         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2339                 User $user = null, $serialFormat = null
2340         ) {
2341                 wfDeprecated( __METHOD__, '1.29' );
2342                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2343                         $user, $serialFormat
2344                 );
2345         }
2346
2347         /**
2348          * Call to WikiPage function for backwards compatibility.
2349          * @see WikiPage::doEditUpdates
2350          */
2351         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2352                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2353         }
2354
2355         /**
2356          * Call to WikiPage function for backwards compatibility.
2357          * @see WikiPage::doPurge
2358          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2359          *  controlled how much purging was done.
2360          */
2361         public function doPurge() {
2362                 return $this->mPage->doPurge();
2363         }
2364
2365         /**
2366          * Call to WikiPage function for backwards compatibility.
2367          * @see WikiPage::doViewUpdates
2368          */
2369         public function doViewUpdates( User $user, $oldid = 0 ) {
2370                 $this->mPage->doViewUpdates( $user, $oldid );
2371         }
2372
2373         /**
2374          * Call to WikiPage function for backwards compatibility.
2375          * @see WikiPage::exists
2376          */
2377         public function exists() {
2378                 return $this->mPage->exists();
2379         }
2380
2381         /**
2382          * Call to WikiPage function for backwards compatibility.
2383          * @see WikiPage::followRedirect
2384          */
2385         public function followRedirect() {
2386                 return $this->mPage->followRedirect();
2387         }
2388
2389         /**
2390          * Call to WikiPage function for backwards compatibility.
2391          * @see ContentHandler::getActionOverrides
2392          */
2393         public function getActionOverrides() {
2394                 return $this->mPage->getActionOverrides();
2395         }
2396
2397         /**
2398          * Call to WikiPage function for backwards compatibility.
2399          * @see WikiPage::getAutoDeleteReason
2400          */
2401         public function getAutoDeleteReason( &$hasHistory ) {
2402                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2403         }
2404
2405         /**
2406          * Call to WikiPage function for backwards compatibility.
2407          * @see WikiPage::getCategories
2408          */
2409         public function getCategories() {
2410                 return $this->mPage->getCategories();
2411         }
2412
2413         /**
2414          * Call to WikiPage function for backwards compatibility.
2415          * @see WikiPage::getComment
2416          */
2417         public function getComment( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2418                 return $this->mPage->getComment( $audience, $user );
2419         }
2420
2421         /**
2422          * Call to WikiPage function for backwards compatibility.
2423          * @see WikiPage::getContentHandler
2424          */
2425         public function getContentHandler() {
2426                 return $this->mPage->getContentHandler();
2427         }
2428
2429         /**
2430          * Call to WikiPage function for backwards compatibility.
2431          * @see WikiPage::getContentModel
2432          */
2433         public function getContentModel() {
2434                 return $this->mPage->getContentModel();
2435         }
2436
2437         /**
2438          * Call to WikiPage function for backwards compatibility.
2439          * @see WikiPage::getContributors
2440          */
2441         public function getContributors() {
2442                 return $this->mPage->getContributors();
2443         }
2444
2445         /**
2446          * Call to WikiPage function for backwards compatibility.
2447          * @see WikiPage::getCreator
2448          */
2449         public function getCreator( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2450                 return $this->mPage->getCreator( $audience, $user );
2451         }
2452
2453         /**
2454          * Call to WikiPage function for backwards compatibility.
2455          * @see WikiPage::getDeletionUpdates
2456          */
2457         public function getDeletionUpdates( Content $content = null ) {
2458                 return $this->mPage->getDeletionUpdates( $content );
2459         }
2460
2461         /**
2462          * Call to WikiPage function for backwards compatibility.
2463          * @see WikiPage::getHiddenCategories
2464          */
2465         public function getHiddenCategories() {
2466                 return $this->mPage->getHiddenCategories();
2467         }
2468
2469         /**
2470          * Call to WikiPage function for backwards compatibility.
2471          * @see WikiPage::getId
2472          */
2473         public function getId() {
2474                 return $this->mPage->getId();
2475         }
2476
2477         /**
2478          * Call to WikiPage function for backwards compatibility.
2479          * @see WikiPage::getLatest
2480          */
2481         public function getLatest() {
2482                 return $this->mPage->getLatest();
2483         }
2484
2485         /**
2486          * Call to WikiPage function for backwards compatibility.
2487          * @see WikiPage::getLinksTimestamp
2488          */
2489         public function getLinksTimestamp() {
2490                 return $this->mPage->getLinksTimestamp();
2491         }
2492
2493         /**
2494          * Call to WikiPage function for backwards compatibility.
2495          * @see WikiPage::getMinorEdit
2496          */
2497         public function getMinorEdit() {
2498                 return $this->mPage->getMinorEdit();
2499         }
2500
2501         /**
2502          * Call to WikiPage function for backwards compatibility.
2503          * @see WikiPage::getOldestRevision
2504          */
2505         public function getOldestRevision() {
2506                 return $this->mPage->getOldestRevision();
2507         }
2508
2509         /**
2510          * Call to WikiPage function for backwards compatibility.
2511          * @see WikiPage::getRedirectTarget
2512          */
2513         public function getRedirectTarget() {
2514                 return $this->mPage->getRedirectTarget();
2515         }
2516
2517         /**
2518          * Call to WikiPage function for backwards compatibility.
2519          * @see WikiPage::getRedirectURL
2520          */
2521         public function getRedirectURL( $rt ) {
2522                 return $this->mPage->getRedirectURL( $rt );
2523         }
2524
2525         /**
2526          * Call to WikiPage function for backwards compatibility.
2527          * @see WikiPage::getRevision
2528          */
2529         public function getRevision() {
2530                 return $this->mPage->getRevision();
2531         }
2532
2533         /**
2534          * Call to WikiPage function for backwards compatibility.
2535          * @see WikiPage::getTimestamp
2536          */
2537         public function getTimestamp() {
2538                 return $this->mPage->getTimestamp();
2539         }
2540
2541         /**
2542          * Call to WikiPage function for backwards compatibility.
2543          * @see WikiPage::getTouched
2544          */
2545         public function getTouched() {
2546                 return $this->mPage->getTouched();
2547         }
2548
2549         /**
2550          * Call to WikiPage function for backwards compatibility.
2551          * @see WikiPage::getUndoContent
2552          */
2553         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2554                 return $this->mPage->getUndoContent( $undo, $undoafter );
2555         }
2556
2557         /**
2558          * Call to WikiPage function for backwards compatibility.
2559          * @see WikiPage::getUser
2560          */
2561         public function getUser( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2562                 return $this->mPage->getUser( $audience, $user );
2563         }
2564
2565         /**
2566          * Call to WikiPage function for backwards compatibility.
2567          * @see WikiPage::getUserText
2568          */
2569         public function getUserText( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2570                 return $this->mPage->getUserText( $audience, $user );
2571         }
2572
2573         /**
2574          * Call to WikiPage function for backwards compatibility.
2575          * @see WikiPage::hasViewableContent
2576          */
2577         public function hasViewableContent() {
2578                 return $this->mPage->hasViewableContent();
2579         }
2580
2581         /**
2582          * Call to WikiPage function for backwards compatibility.
2583          * @see WikiPage::insertOn
2584          */
2585         public function insertOn( $dbw, $pageId = null ) {
2586                 return $this->mPage->insertOn( $dbw, $pageId );
2587         }
2588
2589         /**
2590          * Call to WikiPage function for backwards compatibility.
2591          * @see WikiPage::insertProtectNullRevision
2592          */
2593         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2594                 array $expiry, $cascade, $reason, $user = null
2595         ) {
2596                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2597                         $expiry, $cascade, $reason, $user
2598                 );
2599         }
2600
2601         /**
2602          * Call to WikiPage function for backwards compatibility.
2603          * @see WikiPage::insertRedirect
2604          */
2605         public function insertRedirect() {
2606                 return $this->mPage->insertRedirect();
2607         }
2608
2609         /**
2610          * Call to WikiPage function for backwards compatibility.
2611          * @see WikiPage::insertRedirectEntry
2612          */
2613         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2614                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2615         }
2616
2617         /**
2618          * Call to WikiPage function for backwards compatibility.
2619          * @see WikiPage::isCountable
2620          */
2621         public function isCountable( $editInfo = false ) {
2622                 return $this->mPage->isCountable( $editInfo );
2623         }
2624
2625         /**
2626          * Call to WikiPage function for backwards compatibility.
2627          * @see WikiPage::isRedirect
2628          */
2629         public function isRedirect() {
2630                 return $this->mPage->isRedirect();
2631         }
2632
2633         /**
2634          * Call to WikiPage function for backwards compatibility.
2635          * @see WikiPage::loadFromRow
2636          */
2637         public function loadFromRow( $data, $from ) {
2638                 return $this->mPage->loadFromRow( $data, $from );
2639         }
2640
2641         /**
2642          * Call to WikiPage function for backwards compatibility.
2643          * @see WikiPage::loadPageData
2644          */
2645         public function loadPageData( $from = 'fromdb' ) {
2646                 $this->mPage->loadPageData( $from );
2647         }
2648
2649         /**
2650          * Call to WikiPage function for backwards compatibility.
2651          * @see WikiPage::lockAndGetLatest
2652          */
2653         public function lockAndGetLatest() {
2654                 return $this->mPage->lockAndGetLatest();
2655         }
2656
2657         /**
2658          * Call to WikiPage function for backwards compatibility.
2659          * @see WikiPage::makeParserOptions
2660          */
2661         public function makeParserOptions( $context ) {
2662                 return $this->mPage->makeParserOptions( $context );
2663         }
2664
2665         /**
2666          * Call to WikiPage function for backwards compatibility.
2667          * @see WikiPage::pageDataFromId
2668          */
2669         public function pageDataFromId( $dbr, $id, $options = [] ) {
2670                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2671         }
2672
2673         /**
2674          * Call to WikiPage function for backwards compatibility.
2675          * @see WikiPage::pageDataFromTitle
2676          */
2677         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2678                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2679         }
2680
2681         /**
2682          * Call to WikiPage function for backwards compatibility.
2683          * @see WikiPage::prepareContentForEdit
2684          */
2685         public function prepareContentForEdit(
2686                 Content $content, $revision = null, User $user = null,
2687                 $serialFormat = null, $useCache = true
2688         ) {
2689                 return $this->mPage->prepareContentForEdit(
2690                         $content, $revision, $user,
2691                         $serialFormat, $useCache
2692                 );
2693         }
2694
2695         /**
2696          * Call to WikiPage function for backwards compatibility.
2697          * @see WikiPage::protectDescription
2698          */
2699         public function protectDescription( array $limit, array $expiry ) {
2700                 return $this->mPage->protectDescription( $limit, $expiry );
2701         }
2702
2703         /**
2704          * Call to WikiPage function for backwards compatibility.
2705          * @see WikiPage::protectDescriptionLog
2706          */
2707         public function protectDescriptionLog( array $limit, array $expiry ) {
2708                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2709         }
2710
2711         /**
2712          * Call to WikiPage function for backwards compatibility.
2713          * @see WikiPage::replaceSectionAtRev
2714          */
2715         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2716                 $sectionTitle = '', $baseRevId = null
2717         ) {
2718                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2719                         $sectionTitle, $baseRevId
2720                 );
2721         }
2722
2723         /**
2724          * Call to WikiPage function for backwards compatibility.
2725          * @see WikiPage::replaceSectionContent
2726          */
2727         public function replaceSectionContent(
2728                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2729         ) {
2730                 return $this->mPage->replaceSectionContent(
2731                         $sectionId, $sectionContent, $sectionTitle, $edittime
2732                 );
2733         }
2734
2735         /**
2736          * Call to WikiPage function for backwards compatibility.
2737          * @see WikiPage::setTimestamp
2738          */
2739         public function setTimestamp( $ts ) {
2740                 $this->mPage->setTimestamp( $ts );
2741         }
2742
2743         /**
2744          * Call to WikiPage function for backwards compatibility.
2745          * @see WikiPage::shouldCheckParserCache
2746          */
2747         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2748                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2749         }
2750
2751         /**
2752          * Call to WikiPage function for backwards compatibility.
2753          * @see WikiPage::supportsSections
2754          */
2755         public function supportsSections() {
2756                 return $this->mPage->supportsSections();
2757         }
2758
2759         /**
2760          * Call to WikiPage function for backwards compatibility.
2761          * @see WikiPage::triggerOpportunisticLinksUpdate
2762          */
2763         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2764                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2765         }
2766
2767         /**
2768          * Call to WikiPage function for backwards compatibility.
2769          * @see WikiPage::updateCategoryCounts
2770          */
2771         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2772                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2773         }
2774
2775         /**
2776          * Call to WikiPage function for backwards compatibility.
2777          * @see WikiPage::updateIfNewerOn
2778          */
2779         public function updateIfNewerOn( $dbw, $revision ) {
2780                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2781         }
2782
2783         /**
2784          * Call to WikiPage function for backwards compatibility.
2785          * @see WikiPage::updateRedirectOn
2786          */
2787         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2788                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2789         }
2790
2791         /**
2792          * Call to WikiPage function for backwards compatibility.
2793          * @see WikiPage::updateRevisionOn
2794          */
2795         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2796                 $lastRevIsRedirect = null
2797         ) {
2798                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2799                         $lastRevIsRedirect
2800                 );
2801         }
2802
2803         /**
2804          * @param array $limit
2805          * @param array $expiry
2806          * @param bool &$cascade
2807          * @param string $reason
2808          * @param User $user
2809          * @return Status
2810          */
2811         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2812                 $reason, User $user
2813         ) {
2814                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2815         }
2816
2817         /**
2818          * @param array $limit
2819          * @param string $reason
2820          * @param int &$cascade
2821          * @param array $expiry
2822          * @return bool
2823          */
2824         public function updateRestrictions( $limit = [], $reason = '',
2825                 &$cascade = 0, $expiry = []
2826         ) {
2827                 return $this->mPage->doUpdateRestrictions(
2828                         $limit,
2829                         $expiry,
2830                         $cascade,
2831                         $reason,
2832                         $this->getContext()->getUser()
2833                 );
2834         }
2835
2836         /**
2837          * @param string $reason
2838          * @param bool $suppress
2839          * @param int|null $u1 Unused
2840          * @param bool|null $u2 Unused
2841          * @param string &$error
2842          * @param bool $immediate false allows deleting over time via the job queue
2843          * @return bool
2844          * @throws FatalError
2845          * @throws MWException
2846          */
2847         public function doDeleteArticle(
2848                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2849         ) {
2850                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2851                         null, $immediate );
2852         }
2853
2854         /**
2855          * @param string $fromP
2856          * @param string $summary
2857          * @param string $token
2858          * @param bool $bot
2859          * @param array &$resultDetails
2860          * @param User|null $user
2861          * @return array
2862          */
2863         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2864                 if ( !$user ) {
2865                         $user = $this->getContext()->getUser();
2866                 }
2867
2868                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2869         }
2870
2871         /**
2872          * @param string $fromP
2873          * @param string $summary
2874          * @param bool $bot
2875          * @param array &$resultDetails
2876          * @param User|null $guser
2877          * @return array
2878          */
2879         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2880                 if ( !$guser ) {
2881                         $guser = $this->getContext()->getUser();
2882                 }
2883
2884                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2885         }
2886
2887         /**
2888          * @param bool &$hasHistory
2889          * @return mixed
2890          */
2891         public function generateReason( &$hasHistory ) {
2892                 $title = $this->mPage->getTitle();
2893                 $handler = ContentHandler::getForTitle( $title );
2894                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2895         }
2896
2897         // ******
2898 }