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                 $rl = MediaWikiServices::getInstance()->getRevisionLookup();
 367                 $oldRev = $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 368                 if ( $request->getVal( 'direction' ) == 'next' ) {
 369                         $nextid = 0;
 370                         if ( $oldRev ) {
 371                                 $nextRev = $rl->getNextRevision( $oldRev );
 372                                 if ( $nextRev ) {
 373                                         $nextid = $nextRev->getId();
 374                                 }
 375                         }
 376                         if ( $nextid ) {
 377                                 $oldid = $nextid;
 378                                 $this->mRevision = null;
 379                         } else {
 380                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 381                         }
 382                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 383                         $previd = 0;
 384                         if ( $oldRev ) {
 385                                 $prevRev = $rl->getPreviousRevision( $oldRev );
 386                                 if ( $prevRev ) {
 387                                         $previd = $prevRev->getId();
 388                                 }
 389                         }
 390                         if ( $previd ) {
 391                                 $oldid = $previd;
 392                                 $this->mRevision = null;
 393                         }
 394                 }
 395
 396                 $this->mRevIdFetched = $this->mRevision ? $this->mRevision->getId() : 0;
 397
 398                 return $oldid;
 399         }
 400
 401         /**
 402          * Get text content object
 403          * Does *NOT* follow redirects.
 404          * @todo When is this null?
 405          * @deprecated since 1.32, use fetchRevisionRecord() instead.
 406          *
 407          * @note Code that wants to retrieve page content from the database should
 408          * use WikiPage::getContent().
 409          *
 410          * @return Content|null|bool
 411          *
 412          * @since 1.21
 413          */
 414         protected function fetchContentObject() {
 415                 if ( !$this->mContentLoaded ) {
 416                         $this->fetchRevisionRecord();
 417                 }
 418
 419                 return $this->mContentObject;
 420         }
 421
 422         /**
 423          * Fetches the revision to work on.
 424          * The revision is typically loaded from the database, but may also be a fake representing
 425          * an error message or content supplied by an extension. Refer to $this->fetchResult for
 426          * the revision actually loaded from the database, and any errors encountered while doing
 427          * that.
 428          *
 429          * @return RevisionRecord|null
 430          */
 431         protected function fetchRevisionRecord() {
 432                 if ( $this->fetchResult ) {
 433                         return $this->mRevision ? $this->mRevision->getRevisionRecord() : null;
 434                 }
 435
 436                 $this->mContentLoaded = true;
 437                 $this->mContentObject = null;
 438
 439                 $oldid = $this->getOldID();
 440
 441                 // $this->mRevision might already be fetched by getOldIDFromRequest()
 442                 if ( !$this->mRevision ) {
 443                         if ( !$oldid ) {
 444                                 $this->mRevision = $this->mPage->getRevision();
 445
 446                                 if ( !$this->mRevision ) {
 447                                         wfDebug( __METHOD__ . " failed to find page data for title " .
 448                                                 $this->getTitle()->getPrefixedText() . "\n" );
 449
 450                                         // Just for sanity, output for this case is done by showMissingArticle().
 451                                         $this->fetchResult = Status::newFatal( 'noarticletext' );
 452                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 453                                         return null;
 454                                 }
 455                         } else {
 456                                 $this->mRevision = Revision::newFromId( $oldid );
 457
 458                                 if ( !$this->mRevision ) {
 459                                         wfDebug( __METHOD__ . " failed to load revision, rev_id $oldid\n" );
 460
 461                                         $this->fetchResult = Status::newFatal( 'missing-revision', $oldid );
 462                                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 463                                         return null;
 464                                 }
 465                         }
 466                 }
 467
 468                 $this->mRevIdFetched = $this->mRevision->getId();
 469                 $this->fetchResult = Status::newGood( $this->mRevision );
 470
 471                 if (
 472                         !$this->mRevision->userCan( RevisionRecord::DELETED_TEXT, $this->getContext()->getUser() )
 473                 ) {
 474                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 475                                 $this->mRevision->getId() . "\n" );
 476
 477                         // Just for sanity, output for this case is done by showDeletedRevisionHeader().
 478                         $this->fetchResult = Status::newFatal( 'rev-deleted-text-permission' );
 479                         $this->applyContentOverride( $this->makeFetchErrorContent() );
 480                         return null;
 481                 }
 482
 483                 if ( Hooks::isRegistered( 'ArticleAfterFetchContentObject' ) ) {
 484                         $contentObject = $this->mRevision->getContent(
 485                                 RevisionRecord::FOR_THIS_USER,
 486                                 $this->getContext()->getUser()
 487                         );
 488
 489                         $hookContentObject = $contentObject;
 490
 491                                 // Avoid PHP 7.1 warning of passing $this by reference
 492                         $articlePage = $this;
 493
 494                         Hooks::run(
 495                                 'ArticleAfterFetchContentObject',
 496                                 [ &$articlePage, &$hookContentObject ],
 497                                 '1.32'
 498                         );
 499
 500                         if ( $hookContentObject !== $contentObject ) {
 501                                 // A hook handler is trying to override the content
 502                                 $this->applyContentOverride( $hookContentObject );
 503                         }
 504                 }
 505
 506                 // For B/C only
 507                 $this->mContentObject = $this->mRevision->getContent(
 508                         RevisionRecord::FOR_THIS_USER,
 509                         $this->getContext()->getUser()
 510                 );
 511
 512                 return $this->mRevision->getRevisionRecord();
 513         }
 514
 515         /**
 516          * Returns a Content object representing any error in $this->fetchContent, or null
 517          * if there is no such error.
 518          *
 519          * @return Content|null
 520          */
 521         private function makeFetchErrorContent() {
 522                 if ( !$this->fetchResult || $this->fetchResult->isOK() ) {
 523                         return null;
 524                 }
 525
 526                 return new MessageContent( $this->fetchResult->getMessage() );
 527         }
 528
 529         /**
 530          * Applies a content override by constructing a fake Revision object and assigning
 531          * it to mRevision. The fake revision will not have a user, timestamp or summary set.
 532          *
 533          * This mechanism exists mainly to accommodate extensions that use the
 534          * ArticleAfterFetchContentObject. Once that hook has been removed, there should no longer
 535          * be a need for a fake revision object. fetchRevisionRecord() presently also uses this mechanism
 536          * to report errors, but that could be changed to use $this->fetchResult instead.
 537          *
 538          * @param Content $override Content to be used instead of the actual page content,
 539          *        coming from an extension or representing an error message.
 540          */
 541         private function applyContentOverride( Content $override ) {
 542                 // Construct a fake revision
 543                 $rev = new MutableRevisionRecord( $this->getTitle() );
 544                 $rev->setContent( SlotRecord::MAIN, $override );
 545
 546                 $this->mRevision = new Revision( $rev );
 547
 548                 // For B/C only
 549                 $this->mContentObject = $override;
 550         }
 551
 552         /**
 553          * Returns true if the currently-referenced revision is the current edit
 554          * to this page (and it exists).
 555          * @return bool
 556          */
 557         public function isCurrent() {
 558                 # If no oldid, this is the current version.
 559                 if ( $this->getOldID() == 0 ) {
 560                         return true;
 561                 }
 562
 563                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 564         }
 565
 566         /**
 567          * Get the fetched Revision object depending on request parameters or null
 568          * on failure. The revision returned may be a fake representing an error message or
 569          * wrapping content supplied by an extension. Refer to $this->fetchResult for the
 570          * revision actually loaded from the database.
 571          *
 572          * @since 1.19
 573          * @return Revision|null
 574          */
 575         public function getRevisionFetched() {
 576                 $this->fetchRevisionRecord();
 577
 578                 if ( $this->fetchResult->isOK() ) {
 579                         return $this->mRevision;
 580                 }
 581         }
 582
 583         /**
 584          * Use this to fetch the rev ID used on page views
 585          *
 586          * Before fetchRevisionRecord was called, this returns the page's latest revision,
 587          * regardless of what getOldID() returns.
 588          *
 589          * @return int Revision ID of last article revision
 590          */
 591         public function getRevIdFetched() {
 592                 if ( $this->fetchResult && $this->fetchResult->isOK() ) {
 593                         return $this->fetchResult->value->getId();
 594                 } else {
 595                         return $this->mPage->getLatest();
 596                 }
 597         }
 598
 599         /**
 600          * This is the default action of the index.php entry point: just view the
 601          * page of the given title.
 602          */
 603         public function view() {
 604                 global $wgUseFileCache;
 605
 606                 # Get variables from query string
 607                 # As side effect this will load the revision and update the title
 608                 # in a revision ID is passed in the request, so this should remain
 609                 # the first call of this method even if $oldid is used way below.
 610                 $oldid = $this->getOldID();
 611
 612                 $user = $this->getContext()->getUser();
 613                 # Another whitelist check in case getOldID() is altering the title
 614                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 615                 if ( count( $permErrors ) ) {
 616                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 617                         throw new PermissionsError( 'read', $permErrors );
 618                 }
 619
 620                 $outputPage = $this->getContext()->getOutput();
 621                 # getOldID() may as well want us to redirect somewhere else
 622                 if ( $this->mRedirectUrl ) {
 623                         $outputPage->redirect( $this->mRedirectUrl );
 624                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 625
 626                         return;
 627                 }
 628
 629                 # If we got diff in the query, we want to see a diff page instead of the article.
 630                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 631                         wfDebug( __METHOD__ . ": showing diff page\n" );
 632                         $this->showDiffPage();
 633
 634                         return;
 635                 }
 636
 637                 # Set page title (may be overridden by DISPLAYTITLE)
 638                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 639
 640                 $outputPage->setArticleFlag( true );
 641                 # Allow frames by default
 642                 $outputPage->allowClickjacking();
 643
 644                 $parserCache = MediaWikiServices::getInstance()->getParserCache();
 645
 646                 $parserOptions = $this->getParserOptions();
 647                 $poOptions = [];
 648                 # Render printable version, use printable version cache
 649                 if ( $outputPage->isPrintable() ) {
 650                         $parserOptions->setIsPrintable( true );
 651                         $poOptions['enableSectionEditLinks'] = false;
 652                 } elseif ( $this->viewIsRenderAction || !$this->isCurrent() ||
 653                         !MediaWikiServices::getInstance()->getPermissionManager()
 654                                 ->quickUserCan( 'edit', $user, $this->getTitle() )
 655                 ) {
 656                         $poOptions['enableSectionEditLinks'] = false;
 657                 }
 658
 659                 # Try client and file cache
 660                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 661                         # Try to stream the output from file cache
 662                         if ( $wgUseFileCache && $this->tryFileCache() ) {
 663                                 wfDebug( __METHOD__ . ": done file cache\n" );
 664                                 # tell wgOut that output is taken care of
 665                                 $outputPage->disable();
 666                                 $this->mPage->doViewUpdates( $user, $oldid );
 667
 668                                 return;
 669                         }
 670                 }
 671
 672                 # Should the parser cache be used?
 673                 $useParserCache = $this->mPage->shouldCheckParserCache( $parserOptions, $oldid );
 674                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 675                 if ( $user->getStubThreshold() ) {
 676                         MediaWikiServices::getInstance()->getStatsdDataFactory()->increment( 'pcache_miss_stub' );
 677                 }
 678
 679                 $this->showRedirectedFromHeader();
 680                 $this->showNamespaceHeader();
 681
 682                 # Iterate through the possible ways of constructing the output text.
 683                 # Keep going until $outputDone is set, or we run out of things to do.
 684                 $pass = 0;
 685                 $outputDone = false;
 686                 $this->mParserOutput = false;
 687
 688                 while ( !$outputDone && ++$pass ) {
 689                         switch ( $pass ) {
 690                                 case 1:
 691                                         // Avoid PHP 7.1 warning of passing $this by reference
 692                                         $articlePage = $this;
 693                                         Hooks::run( 'ArticleViewHeader', [ &$articlePage, &$outputDone, &$useParserCache ] );
 694                                         break;
 695                                 case 2:
 696                                         # Early abort if the page doesn't exist
 697                                         if ( !$this->mPage->exists() ) {
 698                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 699                                                 $this->showMissingArticle();
 700                                                 $this->mPage->doViewUpdates( $user );
 701                                                 return;
 702                                         }
 703
 704                                         # Try the parser cache
 705                                         if ( $useParserCache ) {
 706                                                 $this->mParserOutput = $parserCache->get( $this->mPage, $parserOptions );
 707
 708                                                 if ( $this->mParserOutput !== false ) {
 709                                                         if ( $oldid ) {
 710                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 711                                                                 $this->setOldSubtitle( $oldid );
 712                                                         } else {
 713                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 714                                                         }
 715                                                         $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 716                                                         # Ensure that UI elements requiring revision ID have
 717                                                         # the correct version information.
 718                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 719                                                         # Preload timestamp to avoid a DB hit
 720                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 721                                                         if ( $cachedTimestamp !== null ) {
 722                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 723                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 724                                                         }
 725                                                         $outputDone = true;
 726                                                 }
 727                                         }
 728                                         break;
 729                                 case 3:
 730                                         # Are we looking at an old revision
 731                                         $rev = $this->fetchRevisionRecord();
 732                                         if ( $oldid && $this->fetchResult->isOK() ) {
 733                                                 $this->setOldSubtitle( $oldid );
 734
 735                                                 if ( !$this->showDeletedRevisionHeader() ) {
 736                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 737                                                         return;
 738                                                 }
 739                                         }
 740
 741                                         # Ensure that UI elements requiring revision ID have
 742                                         # the correct version information.
 743                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 744                                         # Preload timestamp to avoid a DB hit
 745                                         $outputPage->setRevisionTimestamp( $this->mPage->getTimestamp() );
 746
 747                                         # Pages containing custom CSS or JavaScript get special treatment
 748                                         if ( $this->getTitle()->isSiteConfigPage() || $this->getTitle()->isUserConfigPage() ) {
 749                                                 $dir = $this->getContext()->getLanguage()->getDir();
 750                                                 $lang = $this->getContext()->getLanguage()->getHtmlCode();
 751
 752                                                 $outputPage->wrapWikiMsg(
 753                                                         "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 754                                                         'clearyourcache'
 755                                                 );
 756                                         } elseif ( !Hooks::run( 'ArticleRevisionViewCustom', [
 757                                                         $rev,
 758                                                         $this->getTitle(),
 759                                                         $oldid,
 760                                                         $outputPage,
 761                                                 ] )
 762                                         ) {
 763                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 764                                                 // Allow extensions do their own custom view for certain pages
 765                                                 $outputDone = true;
 766                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 767                                                 [ $this->fetchContentObject(), $this->getTitle(), $outputPage ], '1.32' )
 768                                         ) {
 769                                                 // NOTE: sync with hooks called in DifferenceEngine::renderNewRevision()
 770                                                 // Allow extensions do their own custom view for certain pages
 771                                                 $outputDone = true;
 772                                         }
 773                                         break;
 774                                 case 4:
 775                                         # Run the parse, protected by a pool counter
 776                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 777
 778                                         $rev = $this->fetchRevisionRecord();
 779                                         $error = null;
 780
 781                                         if ( $rev ) {
 782                                                 $poolArticleView = new PoolWorkArticleView(
 783                                                         $this->getPage(),
 784                                                         $parserOptions,
 785                                                         $this->getRevIdFetched(),
 786                                                         $useParserCache,
 787                                                         $rev,
 788                                                         // permission checking was done earlier via showDeletedRevisionHeader()
 789                                                         RevisionRecord::RAW
 790                                                 );
 791                                                 $ok = $poolArticleView->execute();
 792                                                 $error = $poolArticleView->getError();
 793                                                 $this->mParserOutput = $poolArticleView->getParserOutput() ?: null;
 794
 795                                                 # Don't cache a dirty ParserOutput object
 796                                                 if ( $poolArticleView->getIsDirty() ) {
 797                                                         $outputPage->setCdnMaxage( 0 );
 798                                                         $outputPage->addHTML( "<!-- parser cache is expired, " .
 799                                                                 "sending anyway due to pool overload-->\n" );
 800                                                 }
 801                                         } else {
 802                                                 $ok = false;
 803                                         }
 804
 805                                         if ( !$ok ) {
 806                                                 if ( $error ) {
 807                                                         $outputPage->clearHTML(); // for release() errors
 808                                                         $outputPage->enableClientCache( false );
 809                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 810
 811                                                         $errortext = $error->getWikiText(
 812                                                                 false, 'view-pool-error', $this->getContext()->getLanguage()
 813                                                         );
 814                                                         $outputPage->wrapWikiTextAsInterface( 'errorbox', $errortext );
 815                                                 }
 816                                                 # Connection or timeout error
 817                                                 return;
 818                                         }
 819
 820                                         if ( $this->mParserOutput ) {
 821                                                 $outputPage->addParserOutput( $this->mParserOutput, $poOptions );
 822                                         }
 823
 824                                         if ( $rev && $this->getRevisionRedirectTarget( $rev ) ) {
 825                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 826                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 827                                         }
 828
 829                                         $outputDone = true;
 830                                         break;
 831                                 # Should be unreachable, but just in case...
 832                                 default:
 833                                         break 2;
 834                         }
 835                 }
 836
 837                 // Get the ParserOutput actually *displayed* here.
 838                 // Note that $this->mParserOutput is the *current*/oldid version output.
 839                 // Note that the ArticleViewHeader hook is allowed to set $outputDone to a
 840                 // ParserOutput instance.
 841                 $pOutput = ( $outputDone instanceof ParserOutput )
 842                         ? $outputDone // object fetched by hook
 843                         : ( $this->mParserOutput ?: null ); // ParserOutput or null, avoid false
 844
 845                 # Adjust title for main page & pages with displaytitle
 846                 if ( $pOutput ) {
 847                         $this->adjustDisplayTitle( $pOutput );
 848                 }
 849
 850                 # For the main page, overwrite the <title> element with the con-
 851                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 852                 # that's not empty).
 853                 # This message always exists because it is in the i18n files
 854                 if ( $this->getTitle()->isMainPage() ) {
 855                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 856                         if ( !$msg->isDisabled() ) {
 857                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 858                         }
 859                 }
 860
 861                 # Use adaptive TTLs for CDN so delayed/failed purges are noticed less often.
 862                 # This could use getTouched(), but that could be scary for major template edits.
 863                 $outputPage->adaptCdnTTL( $this->mPage->getTimestamp(), IExpiringStore::TTL_DAY );
 864
 865                 # Check for any __NOINDEX__ tags on the page using $pOutput
 866                 $policy = $this->getRobotPolicy( 'view', $pOutput ?: null );
 867                 $outputPage->setIndexPolicy( $policy['index'] );
 868                 $outputPage->setFollowPolicy( $policy['follow'] ); // FIXME: test this
 869
 870                 $this->showViewFooter();
 871                 $this->mPage->doViewUpdates( $user, $oldid ); // FIXME: test this
 872
 873                 # Load the postEdit module if the user just saved this revision
 874                 # See also EditPage::setPostEditCookie
 875                 $request = $this->getContext()->getRequest();
 876                 $cookieKey = EditPage::POST_EDIT_COOKIE_KEY_PREFIX . $this->getRevIdFetched();
 877                 $postEdit = $request->getCookie( $cookieKey );
 878                 if ( $postEdit ) {
 879                         # Clear the cookie. This also prevents caching of the response.
 880                         $request->response()->clearCookie( $cookieKey );
 881                         $outputPage->addJsConfigVars( 'wgPostEdit', $postEdit );
 882                         $outputPage->addModules( 'mediawiki.action.view.postEdit' ); // FIXME: test this
 883                 }
 884         }
 885
 886         /**
 887          * @param RevisionRecord $revision
 888          * @return null|Title
 889          */
 890         private function getRevisionRedirectTarget( RevisionRecord $revision ) {
 891                 // TODO: find a *good* place for the code that determines the redirect target for
 892                 // a given revision!
 893                 // NOTE: Use main slot content. Compare code in DerivedPageDataUpdater::revisionIsRedirect.
 894                 $content = $revision->getContent( SlotRecord::MAIN );
 895                 return $content ? $content->getRedirectTarget() : null;
 896         }
 897
 898         /**
 899          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 900          * @param ParserOutput $pOutput
 901          */
 902         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 903                 $out = $this->getContext()->getOutput();
 904
 905                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 906                 $titleText = $pOutput->getTitleText();
 907                 if ( strval( $titleText ) !== '' ) {
 908                         $out->setPageTitle( $titleText );
 909                         $out->setDisplayTitle( $titleText );
 910                 }
 911         }
 912
 913         /**
 914          * Show a diff page according to current request variables. For use within
 915          * Article::view() only, other callers should use the DifferenceEngine class.
 916          */
 917         protected function showDiffPage() {
 918                 $request = $this->getContext()->getRequest();
 919                 $user = $this->getContext()->getUser();
 920                 $diff = $request->getVal( 'diff' );
 921                 $rcid = $request->getVal( 'rcid' );
 922                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 923                 $purge = $request->getVal( 'action' ) == 'purge';
 924                 $unhide = $request->getInt( 'unhide' ) == 1;
 925                 $oldid = $this->getOldID();
 926
 927                 $rev = $this->getRevisionFetched();
 928
 929                 if ( !$rev ) {
 930                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 931                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 932                                 ->params( $oldid )
 933                                 ->numParams( 1 )
 934                                 ->parseAsBlock();
 935                         $this->getContext()->getOutput()->addHTML( $msg );
 936                         return;
 937                 }
 938
 939                 $contentHandler = $rev->getContentHandler();
 940                 $de = $contentHandler->createDifferenceEngine(
 941                         $this->getContext(),
 942                         $oldid,
 943                         $diff,
 944                         $rcid,
 945                         $purge,
 946                         $unhide
 947                 );
 948
 949                 // DifferenceEngine directly fetched the revision:
 950                 $this->mRevIdFetched = $de->getNewid();
 951                 $de->showDiffPage( $diffOnly );
 952
 953                 // Run view updates for the newer revision being diffed (and shown
 954                 // below the diff if not $diffOnly).
 955                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 956                 // New can be false, convert it to 0 - this conveniently means the latest revision
 957                 $this->mPage->doViewUpdates( $user, (int)$new );
 958         }
 959
 960         /**
 961          * Get the robot policy to be used for the current view
 962          * @param string $action The action= GET parameter
 963          * @param ParserOutput|null $pOutput
 964          * @return array The policy that should be set
 965          * @todo actions other than 'view'
 966          */
 967         public function getRobotPolicy( $action, ParserOutput $pOutput = null ) {
 968                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 969
 970                 $ns = $this->getTitle()->getNamespace();
 971
 972                 # Don't index user and user talk pages for blocked users (T13443)
 973                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 974                         $specificTarget = null;
 975                         $vagueTarget = null;
 976                         $titleText = $this->getTitle()->getText();
 977                         if ( IP::isValid( $titleText ) ) {
 978                                 $vagueTarget = $titleText;
 979                         } else {
 980                                 $specificTarget = $titleText;
 981                         }
 982                         if ( DatabaseBlock::newFromTarget( $specificTarget, $vagueTarget ) instanceof DatabaseBlock ) {
 983                                 return [
 984                                         'index' => 'noindex',
 985                                         'follow' => 'nofollow'
 986                                 ];
 987                         }
 988                 }
 989
 990                 if ( $this->mPage->getId() === 0 || $this->getOldID() ) {
 991                         # Non-articles (special pages etc), and old revisions
 992                         return [
 993                                 'index' => 'noindex',
 994                                 'follow' => 'nofollow'
 995                         ];
 996                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 997                         # Discourage indexing of printable versions, but encourage following
 998                         return [
 999                                 'index' => 'noindex',
1000                                 'follow' => 'follow'
1001                         ];
1002                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
1003                         # For ?curid=x urls, disallow indexing
1004                         return [
1005                                 'index' => 'noindex',
1006                                 'follow' => 'follow'
1007                         ];
1008                 }
1009
1010                 # Otherwise, construct the policy based on the various config variables.
1011                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1012
1013                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1014                         # Honour customised robot policies for this namespace
1015                         $policy = array_merge(
1016                                 $policy,
1017                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1018                         );
1019                 }
1020                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
1021                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1022                         # a final sanity check that we have really got the parser output.
1023                         $policy = array_merge(
1024                                 $policy,
1025                                 [ 'index' => $pOutput->getIndexPolicy() ]
1026                         );
1027                 }
1028
1029                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
1030                         # (T16900) site config can override user-defined __INDEX__ or __NOINDEX__
1031                         $policy = array_merge(
1032                                 $policy,
1033                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
1034                         );
1035                 }
1036
1037                 return $policy;
1038         }
1039
1040         /**
1041          * Converts a String robot policy into an associative array, to allow
1042          * merging of several policies using array_merge().
1043          * @param array|string $policy Returns empty array on null/false/'', transparent
1044          *   to already-converted arrays, converts string.
1045          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
1046          */
1047         public static function formatRobotPolicy( $policy ) {
1048                 if ( is_array( $policy ) ) {
1049                         return $policy;
1050                 } elseif ( !$policy ) {
1051                         return [];
1052                 }
1053
1054                 $policy = explode( ',', $policy );
1055                 $policy = array_map( 'trim', $policy );
1056
1057                 $arr = [];
1058                 foreach ( $policy as $var ) {
1059                         if ( in_array( $var, [ 'index', 'noindex' ] ) ) {
1060                                 $arr['index'] = $var;
1061                         } elseif ( in_array( $var, [ 'follow', 'nofollow' ] ) ) {
1062                                 $arr['follow'] = $var;
1063                         }
1064                 }
1065
1066                 return $arr;
1067         }
1068
1069         /**
1070          * If this request is a redirect view, send "redirected from" subtitle to
1071          * the output. Returns true if the header was needed, false if this is not
1072          * a redirect view. Handles both local and remote redirects.
1073          *
1074          * @return bool
1075          */
1076         public function showRedirectedFromHeader() {
1077                 global $wgRedirectSources;
1078
1079                 $context = $this->getContext();
1080                 $outputPage = $context->getOutput();
1081                 $request = $context->getRequest();
1082                 $rdfrom = $request->getVal( 'rdfrom' );
1083
1084                 // Construct a URL for the current page view, but with the target title
1085                 $query = $request->getValues();
1086                 unset( $query['rdfrom'] );
1087                 unset( $query['title'] );
1088                 if ( $this->getTitle()->isRedirect() ) {
1089                         // Prevent double redirects
1090                         $query['redirect'] = 'no';
1091                 }
1092                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
1093
1094                 if ( isset( $this->mRedirectedFrom ) ) {
1095                         // Avoid PHP 7.1 warning of passing $this by reference
1096                         $articlePage = $this;
1097
1098                         // This is an internally redirected page view.
1099                         // We'll need a backlink to the source page for navigation.
1100                         if ( Hooks::run( 'ArticleViewRedirect', [ &$articlePage ] ) ) {
1101                                 $redir = Linker::linkKnown(
1102                                         $this->mRedirectedFrom,
1103                                         null,
1104                                         [],
1105                                         [ 'redirect' => 'no' ]
1106                                 );
1107
1108                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1109                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1110                                 . "</span>" );
1111
1112                                 // Add the script to update the displayed URL and
1113                                 // set the fragment if one was specified in the redirect
1114                                 $outputPage->addJsConfigVars( [
1115                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1116                                 ] );
1117                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1118
1119                                 // Add a <link rel="canonical"> tag
1120                                 $outputPage->setCanonicalUrl( $this->getTitle()->getCanonicalURL() );
1121
1122                                 // Tell the output object that the user arrived at this article through a redirect
1123                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1124
1125                                 return true;
1126                         }
1127                 } elseif ( $rdfrom ) {
1128                         // This is an externally redirected view, from some other wiki.
1129                         // If it was reported from a trusted site, supply a backlink.
1130                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1131                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1132                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1133                                         $context->msg( 'redirectedfrom' )->rawParams( $redir )->parse()
1134                                 . "</span>" );
1135
1136                                 // Add the script to update the displayed URL
1137                                 $outputPage->addJsConfigVars( [
1138                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1139                                 ] );
1140                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1141
1142                                 return true;
1143                         }
1144                 }
1145
1146                 return false;
1147         }
1148
1149         /**
1150          * Show a header specific to the namespace currently being viewed, like
1151          * [[MediaWiki:Talkpagetext]]. For Article::view().
1152          */
1153         public function showNamespaceHeader() {
1154                 if ( $this->getTitle()->isTalkPage() && !wfMessage( 'talkpageheader' )->isDisabled() ) {
1155                         $this->getContext()->getOutput()->wrapWikiMsg(
1156                                 "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1157                                 [ 'talkpageheader' ]
1158                         );
1159                 }
1160         }
1161
1162         /**
1163          * Show the footer section of an ordinary page view
1164          */
1165         public function showViewFooter() {
1166                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1167                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1168                         && IP::isValid( $this->getTitle()->getText() )
1169                 ) {
1170                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1171                 }
1172
1173                 // Show a footer allowing the user to patrol the shown revision or page if possible
1174                 $patrolFooterShown = $this->showPatrolFooter();
1175
1176                 Hooks::run( 'ArticleViewFooter', [ $this, $patrolFooterShown ] );
1177         }
1178
1179         /**
1180          * If patrol is possible, output a patrol UI box. This is called from the
1181          * footer section of ordinary page views. If patrol is not possible or not
1182          * desired, does nothing.
1183          * Side effect: When the patrol link is build, this method will call
1184          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1185          *
1186          * @return bool
1187          */
1188         public function showPatrolFooter() {
1189                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgUseFilePatrol;
1190
1191                 // Allow hooks to decide whether to not output this at all
1192                 if ( !Hooks::run( 'ArticleShowPatrolFooter', [ $this ] ) ) {
1193                         return false;
1194                 }
1195
1196                 $outputPage = $this->getContext()->getOutput();
1197                 $user = $this->getContext()->getUser();
1198                 $title = $this->getTitle();
1199                 $rc = false;
1200
1201                 if ( !MediaWikiServices::getInstance()->getPermissionManager()
1202                                 ->quickUserCan( 'patrol', $user, $title )
1203                         || !( $wgUseRCPatrol || $wgUseNPPatrol
1204                                 || ( $wgUseFilePatrol && $title->inNamespace( NS_FILE ) ) )
1205                 ) {
1206                         // Patrolling is disabled or the user isn't allowed to
1207                         return false;
1208                 }
1209
1210                 if ( $this->mRevision
1211                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1212                 ) {
1213                         // The current revision is already older than what could be in the RC table
1214                         // 6h tolerance because the RC might not be cleaned out regularly
1215                         return false;
1216                 }
1217
1218                 // Check for cached results
1219                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1220                 $key = $cache->makeKey( 'unpatrollable-page', $title->getArticleID() );
1221                 if ( $cache->get( $key ) ) {
1222                         return false;
1223                 }
1224
1225                 $dbr = wfGetDB( DB_REPLICA );
1226                 $oldestRevisionTimestamp = $dbr->selectField(
1227                         'revision',
1228                         'MIN( rev_timestamp )',
1229                         [ 'rev_page' => $title->getArticleID() ],
1230                         __METHOD__
1231                 );
1232
1233                 // New page patrol: Get the timestamp of the oldest revison which
1234                 // the revision table holds for the given page. Then we look
1235                 // whether it's within the RC lifespan and if it is, we try
1236                 // to get the recentchanges row belonging to that entry
1237                 // (with rc_new = 1).
1238                 $recentPageCreation = false;
1239                 if ( $oldestRevisionTimestamp
1240                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1241                 ) {
1242                         // 6h tolerance because the RC might not be cleaned out regularly
1243                         $recentPageCreation = true;
1244                         $rc = RecentChange::newFromConds(
1245                                 [
1246                                         'rc_new' => 1,
1247                                         'rc_timestamp' => $oldestRevisionTimestamp,
1248                                         'rc_namespace' => $title->getNamespace(),
1249                                         'rc_cur_id' => $title->getArticleID()
1250                                 ],
1251                                 __METHOD__
1252                         );
1253                         if ( $rc ) {
1254                                 // Use generic patrol message for new pages
1255                                 $markPatrolledMsg = wfMessage( 'markaspatrolledtext' );
1256                         }
1257                 }
1258
1259                 // File patrol: Get the timestamp of the latest upload for this page,
1260                 // check whether it is within the RC lifespan and if it is, we try
1261                 // to get the recentchanges row belonging to that entry
1262                 // (with rc_type = RC_LOG, rc_log_type = upload).
1263                 $recentFileUpload = false;
1264                 if ( ( !$rc || $rc->getAttribute( 'rc_patrolled' ) ) && $wgUseFilePatrol
1265                         && $title->getNamespace() === NS_FILE ) {
1266                         // Retrieve timestamp of most recent upload
1267                         $newestUploadTimestamp = $dbr->selectField(
1268                                 'image',
1269                                 'MAX( img_timestamp )',
1270                                 [ 'img_name' => $title->getDBkey() ],
1271                                 __METHOD__
1272                         );
1273                         if ( $newestUploadTimestamp
1274                                 && RecentChange::isInRCLifespan( $newestUploadTimestamp, 21600 )
1275                         ) {
1276                                 // 6h tolerance because the RC might not be cleaned out regularly
1277                                 $recentFileUpload = true;
1278                                 $rc = RecentChange::newFromConds(
1279                                         [
1280                                                 'rc_type' => RC_LOG,
1281                                                 'rc_log_type' => 'upload',
1282                                                 'rc_timestamp' => $newestUploadTimestamp,
1283                                                 'rc_namespace' => NS_FILE,
1284                                                 'rc_cur_id' => $title->getArticleID()
1285                                         ],
1286                                         __METHOD__
1287                                 );
1288                                 if ( $rc ) {
1289                                         // Use patrol message specific to files
1290                                         $markPatrolledMsg = wfMessage( 'markaspatrolledtext-file' );
1291                                 }
1292                         }
1293                 }
1294
1295                 if ( !$recentPageCreation && !$recentFileUpload ) {
1296                         // Page creation and latest upload (for files) is too old to be in RC
1297
1298                         // We definitely can't patrol so cache the information
1299                         // When a new file version is uploaded, the cache is cleared
1300                         $cache->set( $key, '1' );
1301
1302                         return false;
1303                 }
1304
1305                 if ( !$rc ) {
1306                         // Don't cache: This can be hit if the page gets accessed very fast after
1307                         // its creation / latest upload or in case we have high replica DB lag. In case
1308                         // the revision is too old, we will already return above.
1309                         return false;
1310                 }
1311
1312                 if ( $rc->getAttribute( 'rc_patrolled' ) ) {
1313                         // Patrolled RC entry around
1314
1315                         // Cache the information we gathered above in case we can't patrol
1316                         // Don't cache in case we can patrol as this could change
1317                         $cache->set( $key, '1' );
1318
1319                         return false;
1320                 }
1321
1322                 if ( $rc->getPerformer()->equals( $user ) ) {
1323                         // Don't show a patrol link for own creations/uploads. If the user could
1324                         // patrol them, they already would be patrolled
1325                         return false;
1326                 }
1327
1328                 $outputPage->preventClickjacking();
1329                 if ( MediaWikiServices::getInstance()
1330                                 ->getPermissionManager()
1331                                 ->userHasRight( $user, 'writeapi' )
1332                 ) {
1333                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1334                 }
1335
1336                 $link = Linker::linkKnown(
1337                         $title,
1338                         $markPatrolledMsg->escaped(),
1339                         [],
1340                         [
1341                                 'action' => 'markpatrolled',
1342                                 'rcid' => $rc->getAttribute( 'rc_id' ),
1343                         ]
1344                 );
1345
1346                 $outputPage->addHTML(
1347                         "<div class='patrollink' data-mw='interface'>" .
1348                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1349                         '</div>'
1350                 );
1351
1352                 return true;
1353         }
1354
1355         /**
1356          * Purge the cache used to check if it is worth showing the patrol footer
1357          * For example, it is done during re-uploads when file patrol is used.
1358          * @param int $articleID ID of the article to purge
1359          * @since 1.27
1360          */
1361         public static function purgePatrolFooterCache( $articleID ) {
1362                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
1363                 $cache->delete( $cache->makeKey( 'unpatrollable-page', $articleID ) );
1364         }
1365
1366         /**
1367          * Show the error text for a missing article. For articles in the MediaWiki
1368          * namespace, show the default message text. To be called from Article::view().
1369          */
1370         public function showMissingArticle() {
1371                 global $wgSend404Code;
1372
1373                 $outputPage = $this->getContext()->getOutput();
1374                 // Whether the page is a root user page of an existing user (but not a subpage)
1375                 $validUserPage = false;
1376
1377                 $title = $this->getTitle();
1378
1379                 $services = MediaWikiServices::getInstance();
1380
1381                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1382                 if ( $title->getNamespace() == NS_USER
1383                         || $title->getNamespace() == NS_USER_TALK
1384                 ) {
1385                         $rootPart = explode( '/', $title->getText() )[0];
1386                         $user = User::newFromName( $rootPart, false /* allow IP users */ );
1387                         $ip = User::isIP( $rootPart );
1388                         $block = DatabaseBlock::newFromTarget( $user, $user );
1389
1390                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1391                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1392                                         [ 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ] );
1393                         } elseif (
1394                                 !is_null( $block ) &&
1395                                 $block->getType() != DatabaseBlock::TYPE_AUTO &&
1396                                 ( $block->isSitewide() || $user->isBlockedFrom( $title ) )
1397                         ) {
1398                                 // Show log extract if the user is sitewide blocked or is partially
1399                                 // blocked and not allowed to edit their user page or user talk page
1400                                 LogEventsList::showLogExtract(
1401                                         $outputPage,
1402                                         'block',
1403                                         $services->getNamespaceInfo()->getCanonicalName( NS_USER ) . ':' .
1404                                                 $block->getTarget(),
1405                                         '',
1406                                         [
1407                                                 'lim' => 1,
1408                                                 'showIfEmpty' => false,
1409                                                 'msgKey' => [
1410                                                         'blocked-notice-logextract',
1411                                                         $user->getName() # Support GENDER in notice
1412                                                 ]
1413                                         ]
1414                                 );
1415                                 $validUserPage = !$title->isSubpage();
1416                         } else {
1417                                 $validUserPage = !$title->isSubpage();
1418                         }
1419                 }
1420
1421                 Hooks::run( 'ShowMissingArticle', [ $this ] );
1422
1423                 # Show delete and move logs if there were any such events.
1424                 # The logging query can DOS the site when bots/crawlers cause 404 floods,
1425                 # so be careful showing this. 404 pages must be cheap as they are hard to cache.
1426                 $dbCache = ObjectCache::getInstance( 'db-replicated' );
1427                 $key = $dbCache->makeKey( 'page-recent-delete', md5( $title->getPrefixedText() ) );
1428                 $loggedIn = $this->getContext()->getUser()->isLoggedIn();
1429                 $sessionExists = $this->getContext()->getRequest()->getSession()->isPersistent();
1430                 if ( $loggedIn || $dbCache->get( $key ) || $sessionExists ) {
1431                         $logTypes = [ 'delete', 'move', 'protect' ];
1432
1433                         $dbr = wfGetDB( DB_REPLICA );
1434
1435                         $conds = [ 'log_action != ' . $dbr->addQuotes( 'revision' ) ];
1436                         // Give extensions a chance to hide their (unrelated) log entries
1437                         Hooks::run( 'Article::MissingArticleConditions', [ &$conds, $logTypes ] );
1438                         LogEventsList::showLogExtract(
1439                                 $outputPage,
1440                                 $logTypes,
1441                                 $title,
1442                                 '',
1443                                 [
1444                                         'lim' => 10,
1445                                         'conds' => $conds,
1446                                         'showIfEmpty' => false,
1447                                         'msgKey' => [ $loggedIn || $sessionExists
1448                                                 ? 'moveddeleted-notice'
1449                                                 : 'moveddeleted-notice-recent'
1450                                         ]
1451                                 ]
1452                         );
1453                 }
1454
1455                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1456                         // If there's no backing content, send a 404 Not Found
1457                         // for better machine handling of broken links.
1458                         $this->getContext()->getRequest()->response()->statusHeader( 404 );
1459                 }
1460
1461                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1462                 $policy = $this->getRobotPolicy( 'view' );
1463                 $outputPage->setIndexPolicy( $policy['index'] );
1464                 $outputPage->setFollowPolicy( $policy['follow'] );
1465
1466                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', [ $this ] );
1467
1468                 if ( !$hookResult ) {
1469                         return;
1470                 }
1471
1472                 # Show error message
1473                 $oldid = $this->getOldID();
1474                 $pm = MediaWikiServices::getInstance()->getPermissionManager();
1475                 if ( !$oldid && $title->getNamespace() === NS_MEDIAWIKI && $title->hasSourceText() ) {
1476                         // use fake Content object for system message
1477                         $parserOptions = ParserOptions::newCanonical( 'canonical' );
1478                         $outputPage->addParserOutput( $this->getEmptyPageParserOutput( $parserOptions ) );
1479                 } else {
1480                         if ( $oldid ) {
1481                                 $text = wfMessage( 'missing-revision', $oldid )->plain();
1482                         } elseif ( $pm->quickUserCan( 'create', $this->getContext()->getUser(), $title ) &&
1483                                 $pm->quickUserCan( 'edit', $this->getContext()->getUser(), $title )
1484                         ) {
1485                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1486                                 $text = wfMessage( $message )->plain();
1487                         } else {
1488                                 $text = wfMessage( 'noarticletext-nopermission' )->plain();
1489                         }
1490
1491                         $dir = $this->getContext()->getLanguage()->getDir();
1492                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
1493                         $outputPage->addWikiTextAsInterface( Xml::openElement( 'div', [
1494                                 'class' => "noarticletext mw-content-$dir",
1495                                 'dir' => $dir,
1496                                 'lang' => $lang,
1497                         ] ) . "\n$text\n</div>" );
1498                 }
1499         }
1500
1501         /**
1502          * If the revision requested for view is deleted, check permissions.
1503          * Send either an error message or a warning header to the output.
1504          *
1505          * @return bool True if the view is allowed, false if not.
1506          */
1507         public function showDeletedRevisionHeader() {
1508                 if ( !$this->mRevision->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
1509                         // Not deleted
1510                         return true;
1511                 }
1512
1513                 $outputPage = $this->getContext()->getOutput();
1514                 $user = $this->getContext()->getUser();
1515                 // If the user is not allowed to see it...
1516                 if ( !$this->mRevision->userCan( RevisionRecord::DELETED_TEXT, $user ) ) {
1517                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1518                                 'rev-deleted-text-permission' );
1519
1520                         return false;
1521                 // If the user needs to confirm that they want to see it...
1522                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1523                         # Give explanation and add a link to view the revision...
1524                         $oldid = intval( $this->getOldID() );
1525                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1526                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1527                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1528                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1529                                 [ $msg, $link ] );
1530
1531                         return false;
1532                 // We are allowed to see...
1533                 } else {
1534                         $msg = $this->mRevision->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ?
1535                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1536                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1537
1538                         return true;
1539                 }
1540         }
1541
1542         /**
1543          * Generate the navigation links when browsing through an article revisions
1544          * It shows the information as:
1545          *   Revision as of \<date\>; view current revision
1546          *   \<- Previous version | Next Version -\>
1547          *
1548          * @param int $oldid Revision ID of this article revision
1549          */
1550         public function setOldSubtitle( $oldid = 0 ) {
1551                 // Avoid PHP 7.1 warning of passing $this by reference
1552                 $articlePage = $this;
1553
1554                 if ( !Hooks::run( 'DisplayOldSubtitle', [ &$articlePage, &$oldid ] ) ) {
1555                         return;
1556                 }
1557
1558                 $context = $this->getContext();
1559                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1560
1561                 # Cascade unhide param in links for easy deletion browsing
1562                 $extraParams = [];
1563                 if ( $unhide ) {
1564                         $extraParams['unhide'] = 1;
1565                 }
1566
1567                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1568                         $revision = $this->mRevision;
1569                 } else {
1570                         $revision = Revision::newFromId( $oldid );
1571                 }
1572
1573                 $timestamp = $revision->getTimestamp();
1574
1575                 $current = ( $oldid == $this->mPage->getLatest() );
1576                 $language = $context->getLanguage();
1577                 $user = $context->getUser();
1578
1579                 $td = $language->userTimeAndDate( $timestamp, $user );
1580                 $tddate = $language->userDate( $timestamp, $user );
1581                 $tdtime = $language->userTime( $timestamp, $user );
1582
1583                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1584                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1585
1586                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1587                         ? 'revision-info-current'
1588                         : 'revision-info';
1589
1590                 $outputPage = $context->getOutput();
1591                 $revisionInfo = "<div id=\"mw-{$infomsg}\">" .
1592                         $context->msg( $infomsg, $td )
1593                                 ->rawParams( $userlinks )
1594                                 ->params( $revision->getId(), $tddate, $tdtime, $revision->getUserText() )
1595                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1596                                 ->parse() .
1597                         "</div>";
1598
1599                 $lnk = $current
1600                         ? $context->msg( 'currentrevisionlink' )->escaped()
1601                         : Linker::linkKnown(
1602                                 $this->getTitle(),
1603                                 $context->msg( 'currentrevisionlink' )->escaped(),
1604                                 [],
1605                                 $extraParams
1606                         );
1607                 $curdiff = $current
1608                         ? $context->msg( 'diff' )->escaped()
1609                         : Linker::linkKnown(
1610                                 $this->getTitle(),
1611                                 $context->msg( 'diff' )->escaped(),
1612                                 [],
1613                                 [
1614                                         'diff' => 'cur',
1615                                         'oldid' => $oldid
1616                                 ] + $extraParams
1617                         );
1618                 $rl = MediaWikiServices::getInstance()->getRevisionLookup();
1619                 $prevExist = (bool)$rl->getPreviousRevision( $revision->getRevisionRecord() );
1620                 $prevlink = $prevExist
1621                         ? Linker::linkKnown(
1622                                 $this->getTitle(),
1623                                 $context->msg( 'previousrevision' )->escaped(),
1624                                 [],
1625                                 [
1626                                         'direction' => 'prev',
1627                                         'oldid' => $oldid
1628                                 ] + $extraParams
1629                         )
1630                         : $context->msg( 'previousrevision' )->escaped();
1631                 $prevdiff = $prevExist
1632                         ? Linker::linkKnown(
1633                                 $this->getTitle(),
1634                                 $context->msg( 'diff' )->escaped(),
1635                                 [],
1636                                 [
1637                                         'diff' => 'prev',
1638                                         'oldid' => $oldid
1639                                 ] + $extraParams
1640                         )
1641                         : $context->msg( 'diff' )->escaped();
1642                 $nextlink = $current
1643                         ? $context->msg( 'nextrevision' )->escaped()
1644                         : Linker::linkKnown(
1645                                 $this->getTitle(),
1646                                 $context->msg( 'nextrevision' )->escaped(),
1647                                 [],
1648                                 [
1649                                         'direction' => 'next',
1650                                         'oldid' => $oldid
1651                                 ] + $extraParams
1652                         );
1653                 $nextdiff = $current
1654                         ? $context->msg( 'diff' )->escaped()
1655                         : Linker::linkKnown(
1656                                 $this->getTitle(),
1657                                 $context->msg( 'diff' )->escaped(),
1658                                 [],
1659                                 [
1660                                         'diff' => 'next',
1661                                         'oldid' => $oldid
1662                                 ] + $extraParams
1663                         );
1664
1665                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1666                 if ( $cdel !== '' ) {
1667                         $cdel .= ' ';
1668                 }
1669
1670                 // the outer div is need for styling the revision info and nav in MobileFrontend
1671                 $outputPage->addSubtitle( "<div class=\"mw-revision\">" . $revisionInfo .
1672                         "<div id=\"mw-revision-nav\">" . $cdel .
1673                         $context->msg( 'revision-nav' )->rawParams(
1674                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1675                         )->escaped() . "</div></div>" );
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          * @param Title|array $target Destination(s) to redirect
1685          * @param bool $appendSubtitle [optional]
1686          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1687          * @return string Containing HTML with redirect link
1688          *
1689          * @deprecated since 1.30
1690          */
1691         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1692                 $lang = $this->getTitle()->getPageLanguage();
1693                 $out = $this->getContext()->getOutput();
1694                 if ( $appendSubtitle ) {
1695                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1696                 }
1697                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1698                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1699         }
1700
1701         /**
1702          * Return the HTML for the top of a redirect page
1703          *
1704          * Chances are you should just be using the ParserOutput from
1705          * WikitextContent::getParserOutput instead of calling this for redirects.
1706          *
1707          * @since 1.23
1708          * @param Language $lang
1709          * @param Title|array $target Destination(s) to redirect
1710          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1711          * @return string Containing HTML with redirect link
1712          */
1713         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1714                 if ( !is_array( $target ) ) {
1715                         $target = [ $target ];
1716                 }
1717
1718                 $html = '<ul class="redirectText">';
1719                 /** @var Title $title */
1720                 foreach ( $target as $title ) {
1721                         $html .= '<li>' . Linker::link(
1722                                 $title,
1723                                 htmlspecialchars( $title->getFullText() ),
1724                                 [],
1725                                 // Make sure wiki page redirects are not followed
1726                                 $title->isRedirect() ? [ 'redirect' => 'no' ] : [],
1727                                 ( $forceKnown ? [ 'known', 'noclasses' ] : [] )
1728                         ) . '</li>';
1729                 }
1730                 $html .= '</ul>';
1731
1732                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->escaped();
1733
1734                 return '<div class="redirectMsg">' .
1735                         '<p>' . $redirectToText . '</p>' .
1736                         $html .
1737                         '</div>';
1738         }
1739
1740         /**
1741          * Adds help link with an icon via page indicators.
1742          * Link target can be overridden by a local message containing a wikilink:
1743          * the message key is: 'namespace-' + namespace number + '-helppage'.
1744          * @param string $to Target MediaWiki.org page title or encoded URL.
1745          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
1746          * @since 1.25
1747          */
1748         public function addHelpLink( $to, $overrideBaseUrl = false ) {
1749                 $msg = wfMessage(
1750                         'namespace-' . $this->getTitle()->getNamespace() . '-helppage'
1751                 );
1752
1753                 $out = $this->getContext()->getOutput();
1754                 if ( !$msg->isDisabled() ) {
1755                         $helpUrl = Skin::makeUrl( $msg->plain() );
1756                         $out->addHelpLink( $helpUrl, true );
1757                 } else {
1758                         $out->addHelpLink( $to, $overrideBaseUrl );
1759                 }
1760         }
1761
1762         /**
1763          * Handle action=render
1764          */
1765         public function render() {
1766                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1767                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1768                 // We later set 'enableSectionEditLinks=false' based on this; also used by ImagePage
1769                 $this->viewIsRenderAction = true;
1770                 $this->view();
1771         }
1772
1773         /**
1774          * action=protect handler
1775          */
1776         public function protect() {
1777                 $form = new ProtectionForm( $this );
1778                 $form->execute();
1779         }
1780
1781         /**
1782          * action=unprotect handler (alias)
1783          */
1784         public function unprotect() {
1785                 $this->protect();
1786         }
1787
1788         /**
1789          * UI entry point for page deletion
1790          */
1791         public function delete() {
1792                 # This code desperately needs to be totally rewritten
1793
1794                 $title = $this->getTitle();
1795                 $context = $this->getContext();
1796                 $user = $context->getUser();
1797                 $request = $context->getRequest();
1798
1799                 # Check permissions
1800                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1801                 if ( count( $permissionErrors ) ) {
1802                         throw new PermissionsError( 'delete', $permissionErrors );
1803                 }
1804
1805                 # Read-only check...
1806                 if ( wfReadOnly() ) {
1807                         throw new ReadOnlyError;
1808                 }
1809
1810                 # Better double-check that it hasn't been deleted yet!
1811                 $this->mPage->loadPageData(
1812                         $request->wasPosted() ? WikiPage::READ_LATEST : WikiPage::READ_NORMAL
1813                 );
1814                 if ( !$this->mPage->exists() ) {
1815                         $deleteLogPage = new LogPage( 'delete' );
1816                         $outputPage = $context->getOutput();
1817                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1818                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1819                                         [ 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) ]
1820                                 );
1821                         $outputPage->addHTML(
1822                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1823                         );
1824                         LogEventsList::showLogExtract(
1825                                 $outputPage,
1826                                 'delete',
1827                                 $title
1828                         );
1829
1830                         return;
1831                 }
1832
1833                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1834                 $deleteReason = $request->getText( 'wpReason' );
1835
1836                 if ( $deleteReasonList == 'other' ) {
1837                         $reason = $deleteReason;
1838                 } elseif ( $deleteReason != '' ) {
1839                         // Entry from drop down menu + additional comment
1840                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1841                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1842                 } else {
1843                         $reason = $deleteReasonList;
1844                 }
1845
1846                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1847                         [ 'delete', $this->getTitle()->getPrefixedText() ] )
1848                 ) {
1849                         # Flag to hide all contents of the archived revisions
1850
1851                         $suppress = $request->getCheck( 'wpSuppress' ) && MediaWikiServices::getInstance()
1852                                         ->getPermissionManager()
1853                                         ->userHasRight( $user, 'suppressrevision' );
1854
1855                         $this->doDelete( $reason, $suppress );
1856
1857                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1858
1859                         return;
1860                 }
1861
1862                 // Generate deletion reason
1863                 $hasHistory = false;
1864                 if ( !$reason ) {
1865                         try {
1866                                 $reason = $this->generateReason( $hasHistory );
1867                         } catch ( Exception $e ) {
1868                                 # if a page is horribly broken, we still want to be able to
1869                                 # delete it. So be lenient about errors here.
1870                                 wfDebug( "Error while building auto delete summary: $e" );
1871                                 $reason = '';
1872                         }
1873                 }
1874
1875                 // If the page has a history, insert a warning
1876                 if ( $hasHistory ) {
1877                         $title = $this->getTitle();
1878
1879                         // The following can use the real revision count as this is only being shown for users
1880                         // that can delete this page.
1881                         // This, as a side-effect, also makes sure that the following query isn't being run for
1882                         // pages with a larger history, unless the user has the 'bigdelete' right
1883                         // (and is about to delete this page).
1884                         $dbr = wfGetDB( DB_REPLICA );
1885                         $revisions = $edits = (int)$dbr->selectField(
1886                                 'revision',
1887                                 'COUNT(rev_page)',
1888                                 [ 'rev_page' => $title->getArticleID() ],
1889                                 __METHOD__
1890                         );
1891
1892                         // @todo i18n issue/patchwork message
1893                         $context->getOutput()->addHTML(
1894                                 '<strong class="mw-delete-warning-revisions">' .
1895                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1896                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1897                                         $context->msg( 'history' )->escaped(),
1898                                         [],
1899                                         [ 'action' => 'history' ] ) .
1900                                 '</strong>'
1901                         );
1902
1903                         if ( $title->isBigDeletion() ) {
1904                                 global $wgDeleteRevisionsLimit;
1905                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1906                                         [
1907                                                 'delete-warning-toobig',
1908                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1909                                         ]
1910                                 );
1911                         }
1912                 }
1913
1914                 $this->confirmDelete( $reason );
1915         }
1916
1917         /**
1918          * Output deletion confirmation dialog
1919          * @todo Move to another file?
1920          * @param string $reason Prefilled reason
1921          */
1922         public function confirmDelete( $reason ) {
1923                 wfDebug( "Article::confirmDelete\n" );
1924
1925                 $title = $this->getTitle();
1926                 $ctx = $this->getContext();
1927                 $outputPage = $ctx->getOutput();
1928                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1929                 $outputPage->addBacklinkSubtitle( $title );
1930                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1931                 $outputPage->addModules( 'mediawiki.action.delete' );
1932
1933                 $backlinkCache = $title->getBacklinkCache();
1934                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1935                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1936                                 'deleting-backlinks-warning' );
1937                 }
1938
1939                 $subpageQueryLimit = 51;
1940                 $subpages = $title->getSubpages( $subpageQueryLimit );
1941                 $subpageCount = count( $subpages );
1942                 if ( $subpageCount > 0 ) {
1943                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1944                                 [ 'deleting-subpages-warning', Message::numParam( $subpageCount ) ] );
1945                 }
1946                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1947
1948                 Hooks::run( 'ArticleConfirmDelete', [ $this, $outputPage, &$reason ] );
1949
1950                 $user = $this->getContext()->getUser();
1951                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1952
1953                 $outputPage->enableOOUI();
1954
1955                 $fields = [];
1956
1957                 $options = Xml::listDropDownOptions(
1958                         $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->text(),
1959                         [ 'other' => $ctx->msg( 'deletereasonotherlist' )->inContentLanguage()->text() ]
1960                 );
1961                 $options = Xml::listDropDownOptionsOoui( $options );
1962
1963                 $fields[] = new OOUI\FieldLayout(
1964                         new OOUI\DropdownInputWidget( [
1965                                 'name' => 'wpDeleteReasonList',
1966                                 'inputId' => 'wpDeleteReasonList',
1967                                 'tabIndex' => 1,
1968                                 'infusable' => true,
1969                                 'value' => '',
1970                                 'options' => $options
1971                         ] ),
1972                         [
1973                                 'label' => $ctx->msg( 'deletecomment' )->text(),
1974                                 'align' => 'top',
1975                         ]
1976                 );
1977
1978                 // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
1979                 // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
1980                 // Unicode codepoints.
1981                 $fields[] = new OOUI\FieldLayout(
1982                         new OOUI\TextInputWidget( [
1983                                 'name' => 'wpReason',
1984                                 'inputId' => 'wpReason',
1985                                 'tabIndex' => 2,
1986                                 'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
1987                                 'infusable' => true,
1988                                 'value' => $reason,
1989                                 'autofocus' => true,
1990                         ] ),
1991                         [
1992                                 'label' => $ctx->msg( 'deleteotherreason' )->text(),
1993                                 'align' => 'top',
1994                         ]
1995                 );
1996
1997                 if ( $user->isLoggedIn() ) {
1998                         $fields[] = new OOUI\FieldLayout(
1999                                 new OOUI\CheckboxInputWidget( [
2000                                         'name' => 'wpWatch',
2001                                         'inputId' => 'wpWatch',
2002                                         'tabIndex' => 3,
2003                                         'selected' => $checkWatch,
2004                                 ] ),
2005                                 [
2006                                         'label' => $ctx->msg( 'watchthis' )->text(),
2007                                         'align' => 'inline',
2008                                         'infusable' => true,
2009                                 ]
2010                         );
2011                 }
2012                 $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
2013                 if ( $permissionManager->userHasRight( $user, 'suppressrevision' ) ) {
2014                         $fields[] = new OOUI\FieldLayout(
2015                                 new OOUI\CheckboxInputWidget( [
2016                                         'name' => 'wpSuppress',
2017                                         'inputId' => 'wpSuppress',
2018                                         'tabIndex' => 4,
2019                                 ] ),
2020                                 [
2021                                         'label' => $ctx->msg( 'revdelete-suppress' )->text(),
2022                                         'align' => 'inline',
2023                                         'infusable' => true,
2024                                 ]
2025                         );
2026                 }
2027
2028                 $fields[] = new OOUI\FieldLayout(
2029                         new OOUI\ButtonInputWidget( [
2030                                 'name' => 'wpConfirmB',
2031                                 'inputId' => 'wpConfirmB',
2032                                 'tabIndex' => 5,
2033                                 'value' => $ctx->msg( 'deletepage' )->text(),
2034                                 'label' => $ctx->msg( 'deletepage' )->text(),
2035                                 'flags' => [ 'primary', 'destructive' ],
2036                                 'type' => 'submit',
2037                         ] ),
2038                         [
2039                                 'align' => 'top',
2040                         ]
2041                 );
2042
2043                 $fieldset = new OOUI\FieldsetLayout( [
2044                         'label' => $ctx->msg( 'delete-legend' )->text(),
2045                         'id' => 'mw-delete-table',
2046                         'items' => $fields,
2047                 ] );
2048
2049                 $form = new OOUI\FormLayout( [
2050                         'method' => 'post',
2051                         'action' => $title->getLocalURL( 'action=delete' ),
2052                         'id' => 'deleteconfirm',
2053                 ] );
2054                 $form->appendContent(
2055                         $fieldset,
2056                         new OOUI\HtmlSnippet(
2057                                 Html::hidden( 'wpEditToken', $user->getEditToken( [ 'delete', $title->getPrefixedText() ] ) )
2058                         )
2059                 );
2060
2061                 $outputPage->addHTML(
2062                         new OOUI\PanelLayout( [
2063                                 'classes' => [ 'deletepage-wrapper' ],
2064                                 'expanded' => false,
2065                                 'padded' => true,
2066                                 'framed' => true,
2067                                 'content' => $form,
2068                         ] )
2069                 );
2070
2071                 if ( $permissionManager->userHasRight( $user, 'editinterface' ) ) {
2072                         $link = Linker::linkKnown(
2073                                 $ctx->msg( 'deletereason-dropdown' )->inContentLanguage()->getTitle(),
2074                                 wfMessage( 'delete-edit-reasonlist' )->escaped(),
2075                                 [],
2076                                 [ 'action' => 'edit' ]
2077                         );
2078                         $outputPage->addHTML( '<p class="mw-delete-editreasons">' . $link . '</p>' );
2079                 }
2080
2081                 $deleteLogPage = new LogPage( 'delete' );
2082                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2083                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
2084         }
2085
2086         /**
2087          * Perform a deletion and output success or failure messages
2088          * @param string $reason
2089          * @param bool $suppress
2090          * @param bool $immediate false allows deleting over time via the job queue
2091          * @throws FatalError
2092          * @throws MWException
2093          */
2094         public function doDelete( $reason, $suppress = false, $immediate = false ) {
2095                 $error = '';
2096                 $context = $this->getContext();
2097                 $outputPage = $context->getOutput();
2098                 $user = $context->getUser();
2099                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error, $user,
2100                         [], 'delete', $immediate );
2101
2102                 if ( $status->isOK() ) {
2103                         $deleted = $this->getTitle()->getPrefixedText();
2104
2105                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
2106                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
2107
2108                         if ( $status->isGood() ) {
2109                                 $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
2110                                 $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
2111                                 Hooks::run( 'ArticleDeleteAfterSuccess', [ $this->getTitle(), $outputPage ] );
2112                         } else {
2113                                 $outputPage->addWikiMsg( 'delete-scheduled', wfEscapeWikiText( $deleted ) );
2114                         }
2115
2116                         $outputPage->returnToMain( false );
2117                 } else {
2118                         $outputPage->setPageTitle(
2119                                 wfMessage( 'cannotdelete-title',
2120                                         $this->getTitle()->getPrefixedText() )
2121                         );
2122
2123                         if ( $error == '' ) {
2124                                 $outputPage->wrapWikiTextAsInterface(
2125                                         'error mw-error-cannotdelete',
2126                                         $status->getWikiText( false, false, $context->getLanguage() )
2127                                 );
2128                                 $deleteLogPage = new LogPage( 'delete' );
2129                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
2130
2131                                 LogEventsList::showLogExtract(
2132                                         $outputPage,
2133                                         'delete',
2134                                         $this->getTitle()
2135                                 );
2136                         } else {
2137                                 $outputPage->addHTML( $error );
2138                         }
2139                 }
2140         }
2141
2142         /* Caching functions */
2143
2144         /**
2145          * checkLastModified returns true if it has taken care of all
2146          * output to the client that is necessary for this request.
2147          * (that is, it has sent a cached version of the page)
2148          *
2149          * @return bool True if cached version send, false otherwise
2150          */
2151         protected function tryFileCache() {
2152                 static $called = false;
2153
2154                 if ( $called ) {
2155                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2156                         return false;
2157                 }
2158
2159                 $called = true;
2160                 if ( $this->isFileCacheable() ) {
2161                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
2162                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
2163                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2164                                 $cache->loadFromFileCache( $this->getContext() );
2165                                 return true;
2166                         } else {
2167                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2168                                 ob_start( [ &$cache, 'saveToFileCache' ] );
2169                         }
2170                 } else {
2171                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2172                 }
2173
2174                 return false;
2175         }
2176
2177         /**
2178          * Check if the page can be cached
2179          * @param int $mode One of the HTMLFileCache::MODE_* constants (since 1.28)
2180          * @return bool
2181          */
2182         public function isFileCacheable( $mode = HTMLFileCache::MODE_NORMAL ) {
2183                 $cacheable = false;
2184
2185                 if ( HTMLFileCache::useFileCache( $this->getContext(), $mode ) ) {
2186                         $cacheable = $this->mPage->getId()
2187                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
2188                         // Extension may have reason to disable file caching on some pages.
2189                         if ( $cacheable ) {
2190                                 // Avoid PHP 7.1 warning of passing $this by reference
2191                                 $articlePage = $this;
2192                                 $cacheable = Hooks::run( 'IsFileCacheable', [ &$articlePage ] );
2193                         }
2194                 }
2195
2196                 return $cacheable;
2197         }
2198
2199         /** #@- */
2200
2201         /**
2202          * Lightweight method to get the parser output for a page, checking the parser cache
2203          * and so on. Doesn't consider most of the stuff that Article::view() is forced to
2204          * consider, so it's not appropriate to use there.
2205          *
2206          * @since 1.16 (r52326) for LiquidThreads
2207          *
2208          * @param int|null $oldid Revision ID or null
2209          * @param User|null $user The relevant user
2210          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
2211          */
2212         public function getParserOutput( $oldid = null, User $user = null ) {
2213                 // XXX: bypasses mParserOptions and thus setParserOptions()
2214
2215                 if ( $user === null ) {
2216                         $parserOptions = $this->getParserOptions();
2217                 } else {
2218                         $parserOptions = $this->mPage->makeParserOptions( $user );
2219                 }
2220
2221                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
2222         }
2223
2224         /**
2225          * Override the ParserOptions used to render the primary article wikitext.
2226          *
2227          * @param ParserOptions $options
2228          * @throws MWException If the parser options where already initialized.
2229          */
2230         public function setParserOptions( ParserOptions $options ) {
2231                 if ( $this->mParserOptions ) {
2232                         throw new MWException( "can't change parser options after they have already been set" );
2233                 }
2234
2235                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
2236                 $this->mParserOptions = clone $options;
2237         }
2238
2239         /**
2240          * Get parser options suitable for rendering the primary article wikitext
2241          * @return ParserOptions
2242          */
2243         public function getParserOptions() {
2244                 if ( !$this->mParserOptions ) {
2245                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
2246                 }
2247                 // Clone to allow modifications of the return value without affecting cache
2248                 return clone $this->mParserOptions;
2249         }
2250
2251         /**
2252          * Sets the context this Article is executed in
2253          *
2254          * @param IContextSource $context
2255          * @since 1.18
2256          */
2257         public function setContext( $context ) {
2258                 $this->mContext = $context;
2259         }
2260
2261         /**
2262          * Gets the context this Article is executed in
2263          *
2264          * @return IContextSource
2265          * @since 1.18
2266          */
2267         public function getContext() {
2268                 if ( $this->mContext instanceof IContextSource ) {
2269                         return $this->mContext;
2270                 } else {
2271                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
2272                                 "Return RequestContext::getMain(); for sanity\n" );
2273                         return RequestContext::getMain();
2274                 }
2275         }
2276
2277         /**
2278          * Use PHP's magic __get handler to handle accessing of
2279          * raw WikiPage fields for backwards compatibility.
2280          *
2281          * @param string $fname Field name
2282          * @return mixed
2283          */
2284         public function __get( $fname ) {
2285                 if ( property_exists( $this->mPage, $fname ) ) {
2286                         # wfWarn( "Access to raw $fname field " . __CLASS__ );
2287                         return $this->mPage->$fname;
2288                 }
2289                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2290         }
2291
2292         /**
2293          * Use PHP's magic __set handler to handle setting of
2294          * raw WikiPage fields for backwards compatibility.
2295          *
2296          * @param string $fname Field name
2297          * @param mixed $fvalue New value
2298          */
2299         public function __set( $fname, $fvalue ) {
2300                 if ( property_exists( $this->mPage, $fname ) ) {
2301                         # wfWarn( "Access to raw $fname field of " . __CLASS__ );
2302                         $this->mPage->$fname = $fvalue;
2303                 // Note: extensions may want to toss on new fields
2304                 } elseif ( !in_array( $fname, [ 'mContext', 'mPage' ] ) ) {
2305                         $this->mPage->$fname = $fvalue;
2306                 } else {
2307                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2308                 }
2309         }
2310
2311         /**
2312          * Call to WikiPage function for backwards compatibility.
2313          * @see WikiPage::checkFlags
2314          */
2315         public function checkFlags( $flags ) {
2316                 return $this->mPage->checkFlags( $flags );
2317         }
2318
2319         /**
2320          * Call to WikiPage function for backwards compatibility.
2321          * @see WikiPage::checkTouched
2322          */
2323         public function checkTouched() {
2324                 return $this->mPage->checkTouched();
2325         }
2326
2327         /**
2328          * Call to WikiPage function for backwards compatibility.
2329          * @see WikiPage::clearPreparedEdit
2330          */
2331         public function clearPreparedEdit() {
2332                 $this->mPage->clearPreparedEdit();
2333         }
2334
2335         /**
2336          * Call to WikiPage function for backwards compatibility.
2337          * @see WikiPage::doDeleteArticleReal
2338          */
2339         public function doDeleteArticleReal(
2340                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2341                 $tags = [], $immediate = false
2342         ) {
2343                 return $this->mPage->doDeleteArticleReal(
2344                         $reason, $suppress, $u1, $u2, $error, $user, $tags, 'delete', $immediate
2345                 );
2346         }
2347
2348         /**
2349          * Call to WikiPage function for backwards compatibility.
2350          * @see WikiPage::doDeleteUpdates
2351          */
2352         public function doDeleteUpdates(
2353                 $id,
2354                 Content $content = null,
2355                 $revision = null,
2356                 User $user = null
2357         ) {
2358                 $this->mPage->doDeleteUpdates( $id, $content, $revision, $user );
2359         }
2360
2361         /**
2362          * Call to WikiPage function for backwards compatibility.
2363          * @deprecated since 1.29. Use WikiPage::doEditContent() directly instead
2364          * @see WikiPage::doEditContent
2365          */
2366         public function doEditContent( Content $content, $summary, $flags = 0, $originalRevId = false,
2367                 User $user = null, $serialFormat = null
2368         ) {
2369                 wfDeprecated( __METHOD__, '1.29' );
2370                 return $this->mPage->doEditContent( $content, $summary, $flags, $originalRevId,
2371                         $user, $serialFormat
2372                 );
2373         }
2374
2375         /**
2376          * Call to WikiPage function for backwards compatibility.
2377          * @see WikiPage::doEditUpdates
2378          */
2379         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2380                 return $this->mPage->doEditUpdates( $revision, $user, $options );
2381         }
2382
2383         /**
2384          * Call to WikiPage function for backwards compatibility.
2385          * @see WikiPage::doPurge
2386          * @note In 1.28 (and only 1.28), this took a $flags parameter that
2387          *  controlled how much purging was done.
2388          */
2389         public function doPurge() {
2390                 return $this->mPage->doPurge();
2391         }
2392
2393         /**
2394          * Call to WikiPage function for backwards compatibility.
2395          * @see WikiPage::doViewUpdates
2396          */
2397         public function doViewUpdates( User $user, $oldid = 0 ) {
2398                 $this->mPage->doViewUpdates( $user, $oldid );
2399         }
2400
2401         /**
2402          * Call to WikiPage function for backwards compatibility.
2403          * @see WikiPage::exists
2404          */
2405         public function exists() {
2406                 return $this->mPage->exists();
2407         }
2408
2409         /**
2410          * Call to WikiPage function for backwards compatibility.
2411          * @see WikiPage::followRedirect
2412          */
2413         public function followRedirect() {
2414                 return $this->mPage->followRedirect();
2415         }
2416
2417         /**
2418          * Call to WikiPage function for backwards compatibility.
2419          * @see ContentHandler::getActionOverrides
2420          */
2421         public function getActionOverrides() {
2422                 return $this->mPage->getActionOverrides();
2423         }
2424
2425         /**
2426          * Call to WikiPage function for backwards compatibility.
2427          * @see WikiPage::getAutoDeleteReason
2428          */
2429         public function getAutoDeleteReason( &$hasHistory ) {
2430                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2431         }
2432
2433         /**
2434          * Call to WikiPage function for backwards compatibility.
2435          * @see WikiPage::getCategories
2436          */
2437         public function getCategories() {
2438                 return $this->mPage->getCategories();
2439         }
2440
2441         /**
2442          * Call to WikiPage function for backwards compatibility.
2443          * @see WikiPage::getComment
2444          */
2445         public function getComment( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2446                 return $this->mPage->getComment( $audience, $user );
2447         }
2448
2449         /**
2450          * Call to WikiPage function for backwards compatibility.
2451          * @see WikiPage::getContentHandler
2452          */
2453         public function getContentHandler() {
2454                 return $this->mPage->getContentHandler();
2455         }
2456
2457         /**
2458          * Call to WikiPage function for backwards compatibility.
2459          * @see WikiPage::getContentModel
2460          */
2461         public function getContentModel() {
2462                 return $this->mPage->getContentModel();
2463         }
2464
2465         /**
2466          * Call to WikiPage function for backwards compatibility.
2467          * @see WikiPage::getContributors
2468          */
2469         public function getContributors() {
2470                 return $this->mPage->getContributors();
2471         }
2472
2473         /**
2474          * Call to WikiPage function for backwards compatibility.
2475          * @see WikiPage::getCreator
2476          */
2477         public function getCreator( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2478                 return $this->mPage->getCreator( $audience, $user );
2479         }
2480
2481         /**
2482          * Call to WikiPage function for backwards compatibility.
2483          * @see WikiPage::getDeletionUpdates
2484          */
2485         public function getDeletionUpdates( Content $content = null ) {
2486                 return $this->mPage->getDeletionUpdates( $content );
2487         }
2488
2489         /**
2490          * Call to WikiPage function for backwards compatibility.
2491          * @see WikiPage::getHiddenCategories
2492          */
2493         public function getHiddenCategories() {
2494                 return $this->mPage->getHiddenCategories();
2495         }
2496
2497         /**
2498          * Call to WikiPage function for backwards compatibility.
2499          * @see WikiPage::getId
2500          */
2501         public function getId() {
2502                 return $this->mPage->getId();
2503         }
2504
2505         /**
2506          * Call to WikiPage function for backwards compatibility.
2507          * @see WikiPage::getLatest
2508          */
2509         public function getLatest() {
2510                 return $this->mPage->getLatest();
2511         }
2512
2513         /**
2514          * Call to WikiPage function for backwards compatibility.
2515          * @see WikiPage::getLinksTimestamp
2516          */
2517         public function getLinksTimestamp() {
2518                 return $this->mPage->getLinksTimestamp();
2519         }
2520
2521         /**
2522          * Call to WikiPage function for backwards compatibility.
2523          * @see WikiPage::getMinorEdit
2524          */
2525         public function getMinorEdit() {
2526                 return $this->mPage->getMinorEdit();
2527         }
2528
2529         /**
2530          * Call to WikiPage function for backwards compatibility.
2531          * @see WikiPage::getOldestRevision
2532          */
2533         public function getOldestRevision() {
2534                 return $this->mPage->getOldestRevision();
2535         }
2536
2537         /**
2538          * Call to WikiPage function for backwards compatibility.
2539          * @see WikiPage::getRedirectTarget
2540          */
2541         public function getRedirectTarget() {
2542                 return $this->mPage->getRedirectTarget();
2543         }
2544
2545         /**
2546          * Call to WikiPage function for backwards compatibility.
2547          * @see WikiPage::getRedirectURL
2548          */
2549         public function getRedirectURL( $rt ) {
2550                 return $this->mPage->getRedirectURL( $rt );
2551         }
2552
2553         /**
2554          * Call to WikiPage function for backwards compatibility.
2555          * @see WikiPage::getRevision
2556          */
2557         public function getRevision() {
2558                 return $this->mPage->getRevision();
2559         }
2560
2561         /**
2562          * Call to WikiPage function for backwards compatibility.
2563          * @see WikiPage::getTimestamp
2564          */
2565         public function getTimestamp() {
2566                 return $this->mPage->getTimestamp();
2567         }
2568
2569         /**
2570          * Call to WikiPage function for backwards compatibility.
2571          * @see WikiPage::getTouched
2572          */
2573         public function getTouched() {
2574                 return $this->mPage->getTouched();
2575         }
2576
2577         /**
2578          * Call to WikiPage function for backwards compatibility.
2579          * @see WikiPage::getUndoContent
2580          */
2581         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
2582                 return $this->mPage->getUndoContent( $undo, $undoafter );
2583         }
2584
2585         /**
2586          * Call to WikiPage function for backwards compatibility.
2587          * @see WikiPage::getUser
2588          */
2589         public function getUser( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2590                 return $this->mPage->getUser( $audience, $user );
2591         }
2592
2593         /**
2594          * Call to WikiPage function for backwards compatibility.
2595          * @see WikiPage::getUserText
2596          */
2597         public function getUserText( $audience = RevisionRecord::FOR_PUBLIC, User $user = null ) {
2598                 return $this->mPage->getUserText( $audience, $user );
2599         }
2600
2601         /**
2602          * Call to WikiPage function for backwards compatibility.
2603          * @see WikiPage::hasViewableContent
2604          */
2605         public function hasViewableContent() {
2606                 return $this->mPage->hasViewableContent();
2607         }
2608
2609         /**
2610          * Call to WikiPage function for backwards compatibility.
2611          * @see WikiPage::insertOn
2612          */
2613         public function insertOn( $dbw, $pageId = null ) {
2614                 return $this->mPage->insertOn( $dbw, $pageId );
2615         }
2616
2617         /**
2618          * Call to WikiPage function for backwards compatibility.
2619          * @see WikiPage::insertProtectNullRevision
2620          */
2621         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2622                 array $expiry, $cascade, $reason, $user = null
2623         ) {
2624                 return $this->mPage->insertProtectNullRevision( $revCommentMsg, $limit,
2625                         $expiry, $cascade, $reason, $user
2626                 );
2627         }
2628
2629         /**
2630          * Call to WikiPage function for backwards compatibility.
2631          * @see WikiPage::insertRedirect
2632          */
2633         public function insertRedirect() {
2634                 return $this->mPage->insertRedirect();
2635         }
2636
2637         /**
2638          * Call to WikiPage function for backwards compatibility.
2639          * @see WikiPage::insertRedirectEntry
2640          */
2641         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
2642                 return $this->mPage->insertRedirectEntry( $rt, $oldLatest );
2643         }
2644
2645         /**
2646          * Call to WikiPage function for backwards compatibility.
2647          * @see WikiPage::isCountable
2648          */
2649         public function isCountable( $editInfo = false ) {
2650                 return $this->mPage->isCountable( $editInfo );
2651         }
2652
2653         /**
2654          * Call to WikiPage function for backwards compatibility.
2655          * @see WikiPage::isRedirect
2656          */
2657         public function isRedirect() {
2658                 return $this->mPage->isRedirect();
2659         }
2660
2661         /**
2662          * Call to WikiPage function for backwards compatibility.
2663          * @see WikiPage::loadFromRow
2664          */
2665         public function loadFromRow( $data, $from ) {
2666                 return $this->mPage->loadFromRow( $data, $from );
2667         }
2668
2669         /**
2670          * Call to WikiPage function for backwards compatibility.
2671          * @see WikiPage::loadPageData
2672          */
2673         public function loadPageData( $from = 'fromdb' ) {
2674                 $this->mPage->loadPageData( $from );
2675         }
2676
2677         /**
2678          * Call to WikiPage function for backwards compatibility.
2679          * @see WikiPage::lockAndGetLatest
2680          */
2681         public function lockAndGetLatest() {
2682                 return $this->mPage->lockAndGetLatest();
2683         }
2684
2685         /**
2686          * Call to WikiPage function for backwards compatibility.
2687          * @see WikiPage::makeParserOptions
2688          */
2689         public function makeParserOptions( $context ) {
2690                 return $this->mPage->makeParserOptions( $context );
2691         }
2692
2693         /**
2694          * Call to WikiPage function for backwards compatibility.
2695          * @see WikiPage::pageDataFromId
2696          */
2697         public function pageDataFromId( $dbr, $id, $options = [] ) {
2698                 return $this->mPage->pageDataFromId( $dbr, $id, $options );
2699         }
2700
2701         /**
2702          * Call to WikiPage function for backwards compatibility.
2703          * @see WikiPage::pageDataFromTitle
2704          */
2705         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
2706                 return $this->mPage->pageDataFromTitle( $dbr, $title, $options );
2707         }
2708
2709         /**
2710          * Call to WikiPage function for backwards compatibility.
2711          * @see WikiPage::prepareContentForEdit
2712          */
2713         public function prepareContentForEdit(
2714                 Content $content, $revision = null, User $user = null,
2715                 $serialFormat = null, $useCache = true
2716         ) {
2717                 return $this->mPage->prepareContentForEdit(
2718                         $content, $revision, $user,
2719                         $serialFormat, $useCache
2720                 );
2721         }
2722
2723         /**
2724          * Call to WikiPage function for backwards compatibility.
2725          * @see WikiPage::protectDescription
2726          */
2727         public function protectDescription( array $limit, array $expiry ) {
2728                 return $this->mPage->protectDescription( $limit, $expiry );
2729         }
2730
2731         /**
2732          * Call to WikiPage function for backwards compatibility.
2733          * @see WikiPage::protectDescriptionLog
2734          */
2735         public function protectDescriptionLog( array $limit, array $expiry ) {
2736                 return $this->mPage->protectDescriptionLog( $limit, $expiry );
2737         }
2738
2739         /**
2740          * Call to WikiPage function for backwards compatibility.
2741          * @see WikiPage::replaceSectionAtRev
2742          */
2743         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
2744                 $sectionTitle = '', $baseRevId = null
2745         ) {
2746                 return $this->mPage->replaceSectionAtRev( $sectionId, $sectionContent,
2747                         $sectionTitle, $baseRevId
2748                 );
2749         }
2750
2751         /**
2752          * Call to WikiPage function for backwards compatibility.
2753          * @see WikiPage::replaceSectionContent
2754          */
2755         public function replaceSectionContent(
2756                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
2757         ) {
2758                 return $this->mPage->replaceSectionContent(
2759                         $sectionId, $sectionContent, $sectionTitle, $edittime
2760                 );
2761         }
2762
2763         /**
2764          * Call to WikiPage function for backwards compatibility.
2765          * @see WikiPage::setTimestamp
2766          */
2767         public function setTimestamp( $ts ) {
2768                 $this->mPage->setTimestamp( $ts );
2769         }
2770
2771         /**
2772          * Call to WikiPage function for backwards compatibility.
2773          * @see WikiPage::shouldCheckParserCache
2774          */
2775         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
2776                 return $this->mPage->shouldCheckParserCache( $parserOptions, $oldId );
2777         }
2778
2779         /**
2780          * Call to WikiPage function for backwards compatibility.
2781          * @see WikiPage::supportsSections
2782          */
2783         public function supportsSections() {
2784                 return $this->mPage->supportsSections();
2785         }
2786
2787         /**
2788          * Call to WikiPage function for backwards compatibility.
2789          * @see WikiPage::triggerOpportunisticLinksUpdate
2790          */
2791         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
2792                 return $this->mPage->triggerOpportunisticLinksUpdate( $parserOutput );
2793         }
2794
2795         /**
2796          * Call to WikiPage function for backwards compatibility.
2797          * @see WikiPage::updateCategoryCounts
2798          */
2799         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
2800                 return $this->mPage->updateCategoryCounts( $added, $deleted, $id );
2801         }
2802
2803         /**
2804          * Call to WikiPage function for backwards compatibility.
2805          * @see WikiPage::updateIfNewerOn
2806          */
2807         public function updateIfNewerOn( $dbw, $revision ) {
2808                 return $this->mPage->updateIfNewerOn( $dbw, $revision );
2809         }
2810
2811         /**
2812          * Call to WikiPage function for backwards compatibility.
2813          * @see WikiPage::updateRedirectOn
2814          */
2815         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
2816                 return $this->mPage->updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect );
2817         }
2818
2819         /**
2820          * Call to WikiPage function for backwards compatibility.
2821          * @see WikiPage::updateRevisionOn
2822          */
2823         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
2824                 $lastRevIsRedirect = null
2825         ) {
2826                 return $this->mPage->updateRevisionOn( $dbw, $revision, $lastRevision,
2827                         $lastRevIsRedirect
2828                 );
2829         }
2830
2831         /**
2832          * @param array $limit
2833          * @param array $expiry
2834          * @param bool &$cascade
2835          * @param string $reason
2836          * @param User $user
2837          * @return Status
2838          */
2839         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2840                 $reason, User $user
2841         ) {
2842                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2843         }
2844
2845         /**
2846          * @param array $limit
2847          * @param string $reason
2848          * @param int &$cascade
2849          * @param array $expiry
2850          * @return bool
2851          */
2852         public function updateRestrictions( $limit = [], $reason = '',
2853                 &$cascade = 0, $expiry = []
2854         ) {
2855                 return $this->mPage->doUpdateRestrictions(
2856                         $limit,
2857                         $expiry,
2858                         $cascade,
2859                         $reason,
2860                         $this->getContext()->getUser()
2861                 );
2862         }
2863
2864         /**
2865          * @param string $reason
2866          * @param bool $suppress
2867          * @param int|null $u1 Unused
2868          * @param bool|null $u2 Unused
2869          * @param string &$error
2870          * @param bool $immediate false allows deleting over time via the job queue
2871          * @return bool
2872          * @throws FatalError
2873          * @throws MWException
2874          */
2875         public function doDeleteArticle(
2876                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', $immediate = false
2877         ) {
2878                 return $this->mPage->doDeleteArticle( $reason, $suppress, $u1, $u2, $error,
2879                         null, $immediate );
2880         }
2881
2882         /**
2883          * @param string $fromP
2884          * @param string $summary
2885          * @param string $token
2886          * @param bool $bot
2887          * @param array &$resultDetails
2888          * @param User|null $user
2889          * @return array
2890          */
2891         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2892                 if ( !$user ) {
2893                         $user = $this->getContext()->getUser();
2894                 }
2895
2896                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2897         }
2898
2899         /**
2900          * @param string $fromP
2901          * @param string $summary
2902          * @param bool $bot
2903          * @param array &$resultDetails
2904          * @param User|null $guser
2905          * @return array
2906          */
2907         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2908                 if ( !$guser ) {
2909                         $guser = $this->getContext()->getUser();
2910                 }
2911
2912                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2913         }
2914
2915         /**
2916          * @param bool &$hasHistory
2917          * @return mixed
2918          */
2919         public function generateReason( &$hasHistory ) {
2920                 $title = $this->mPage->getTitle();
2921                 $handler = ContentHandler::getForTitle( $title );
2922                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2923         }
2924
2925         // ******
2926 }