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
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class Article implements Page {
  37         /** @var IContextSource The context this Article is executed in */
  38         protected $mContext;
  39
  40         /** @var WikiPage The WikiPage object of this instance */
  41         protected $mPage;
  42
  43         /** @var ParserOptions ParserOptions object for $wgUser articles */
  44         public $mParserOptions;
  45
  46         /**
  47          * @var string Text of the revision we are working on
  48          * @todo BC cruft
  49          */
  50         public $mContent;
  51
  52         /**
  53          * @var Content Content of the revision we are working on
  54          * @since 1.21
  55          */
  56         public $mContentObject;
  57
  58         /** @var bool Is the content ($mContent) already loaded? */
  59         public $mContentLoaded = false;
  60
  61         /** @var int|null The oldid of the article that is to be shown, 0 for the current revision */
  62         public $mOldId;
  63
  64         /** @var Title Title from which we were redirected here */
  65         public $mRedirectedFrom = null;
  66
  67         /** @var string|bool URL to redirect to or false if none */
  68         public $mRedirectUrl = false;
  69
  70         /** @var int Revision ID of revision we are working on */
  71         public $mRevIdFetched = 0;
  72
  73         /** @var Revision Revision we are working on */
  74         public $mRevision = null;
  75
  76         /** @var ParserOutput */
  77         public $mParserOutput;
  78
  79         /**
  80          * Constructor and clear the article
  81          * @param Title $title Reference to a Title object.
  82          * @param int $oldId Revision ID, null to fetch from request, zero for current
  83          */
  84         public function __construct( Title $title, $oldId = null ) {
  85                 $this->mOldId = $oldId;
  86                 $this->mPage = $this->newPage( $title );
  87         }
  88
  89         /**
  90          * @param Title $title
  91          * @return WikiPage
  92          */
  93         protected function newPage( Title $title ) {
  94                 return new WikiPage( $title );
  95         }
  96
  97         /**
  98          * Constructor from a page id
  99          * @param int $id Article ID to load
 100          * @return Article|null
 101          */
 102         public static function newFromID( $id ) {
 103                 $t = Title::newFromID( $id );
 104                 # @todo FIXME: Doesn't inherit right
 105                 return $t == null ? null : new self( $t );
 106                 # return $t == null ? null : new static( $t ); // PHP 5.3
 107         }
 108
 109         /**
 110          * Create an Article object of the appropriate class for the given page.
 111          *
 112          * @param Title $title
 113          * @param IContextSource $context
 114          * @return Article
 115          */
 116         public static function newFromTitle( $title, IContextSource $context ) {
 117                 if ( NS_MEDIA == $title->getNamespace() ) {
 118                         // FIXME: where should this go?
 119                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 120                 }
 121
 122                 $page = null;
 123                 Hooks::run( 'ArticleFromTitle', array( &$title, &$page, $context ) );
 124                 if ( !$page ) {
 125                         switch ( $title->getNamespace() ) {
 126                                 case NS_FILE:
 127                                         $page = new ImagePage( $title );
 128                                         break;
 129                                 case NS_CATEGORY:
 130                                         $page = new CategoryPage( $title );
 131                                         break;
 132                                 default:
 133                                         $page = new Article( $title );
 134                         }
 135                 }
 136                 $page->setContext( $context );
 137
 138                 return $page;
 139         }
 140
 141         /**
 142          * Create an Article object of the appropriate class for the given page.
 143          *
 144          * @param WikiPage $page
 145          * @param IContextSource $context
 146          * @return Article
 147          */
 148         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 149                 $article = self::newFromTitle( $page->getTitle(), $context );
 150                 $article->mPage = $page; // override to keep process cached vars
 151                 return $article;
 152         }
 153
 154         /**
 155          * Tell the page view functions that this view was redirected
 156          * from another page on the wiki.
 157          * @param Title $from
 158          */
 159         public function setRedirectedFrom( Title $from ) {
 160                 $this->mRedirectedFrom = $from;
 161         }
 162
 163         /**
 164          * Get the title object of the article
 165          *
 166          * @return Title Title object of this page
 167          */
 168         public function getTitle() {
 169                 return $this->mPage->getTitle();
 170         }
 171
 172         /**
 173          * Get the WikiPage object of this instance
 174          *
 175          * @since 1.19
 176          * @return WikiPage
 177          */
 178         public function getPage() {
 179                 return $this->mPage;
 180         }
 181
 182         /**
 183          * Clear the object
 184          */
 185         public function clear() {
 186                 $this->mContentLoaded = false;
 187
 188                 $this->mRedirectedFrom = null; # Title object if set
 189                 $this->mRevIdFetched = 0;
 190                 $this->mRedirectUrl = false;
 191
 192                 $this->mPage->clear();
 193         }
 194
 195         /**
 196          * Note that getContent/loadContent do not follow redirects anymore.
 197          * If you need to fetch redirectable content easily, try
 198          * the shortcut in WikiPage::getRedirectTarget()
 199          *
 200          * This function has side effects! Do not use this function if you
 201          * only want the real revision text if any.
 202          *
 203          * @deprecated since 1.21; use WikiPage::getContent() instead
 204          *
 205          * @return string Return the text of this revision
 206          */
 207         public function getContent() {
 208                 ContentHandler::deprecated( __METHOD__, '1.21' );
 209                 $content = $this->getContentObject();
 210                 return ContentHandler::getContentText( $content );
 211         }
 212
 213         /**
 214          * Returns a Content object representing the pages effective display content,
 215          * not necessarily the revision's content!
 216          *
 217          * Note that getContent/loadContent do not follow redirects anymore.
 218          * If you need to fetch redirectable content easily, try
 219          * the shortcut in WikiPage::getRedirectTarget()
 220          *
 221          * This function has side effects! Do not use this function if you
 222          * only want the real revision text if any.
 223          *
 224          * @return Content Return the content of this revision
 225          *
 226          * @since 1.21
 227          */
 228         protected function getContentObject() {
 229
 230                 if ( $this->mPage->getID() === 0 ) {
 231                         # If this is a MediaWiki:x message, then load the messages
 232                         # and return the message value for x.
 233                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 234                                 $text = $this->getTitle()->getDefaultMessageText();
 235                                 if ( $text === false ) {
 236                                         $text = '';
 237                                 }
 238
 239                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 240                         } else {
 241                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 242                                 $content = new MessageContent( $message, null, 'parsemag' );
 243                         }
 244                 } else {
 245                         $this->fetchContentObject();
 246                         $content = $this->mContentObject;
 247                 }
 248
 249                 return $content;
 250         }
 251
 252         /**
 253          * @return int The oldid of the article that is to be shown, 0 for the current revision
 254          */
 255         public function getOldID() {
 256                 if ( is_null( $this->mOldId ) ) {
 257                         $this->mOldId = $this->getOldIDFromRequest();
 258                 }
 259
 260                 return $this->mOldId;
 261         }
 262
 263         /**
 264          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 265          *
 266          * @return int The old id for the request
 267          */
 268         public function getOldIDFromRequest() {
 269                 $this->mRedirectUrl = false;
 270
 271                 $request = $this->getContext()->getRequest();
 272                 $oldid = $request->getIntOrNull( 'oldid' );
 273
 274                 if ( $oldid === null ) {
 275                         return 0;
 276                 }
 277
 278                 if ( $oldid !== 0 ) {
 279                         # Load the given revision and check whether the page is another one.
 280                         # In that case, update this instance to reflect the change.
 281                         if ( $oldid === $this->mPage->getLatest() ) {
 282                                 $this->mRevision = $this->mPage->getRevision();
 283                         } else {
 284                                 $this->mRevision = Revision::newFromId( $oldid );
 285                                 if ( $this->mRevision !== null ) {
 286                                         // Revision title doesn't match the page title given?
 287                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 288                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 289                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 290                                         }
 291                                 }
 292                         }
 293                 }
 294
 295                 if ( $request->getVal( 'direction' ) == 'next' ) {
 296                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 297                         if ( $nextid ) {
 298                                 $oldid = $nextid;
 299                                 $this->mRevision = null;
 300                         } else {
 301                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 302                         }
 303                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 304                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 305                         if ( $previd ) {
 306                                 $oldid = $previd;
 307                                 $this->mRevision = null;
 308                         }
 309                 }
 310
 311                 return $oldid;
 312         }
 313
 314         /**
 315          * Load the revision (including text) into this object
 316          *
 317          * @deprecated since 1.19; use fetchContent()
 318          */
 319         function loadContent() {
 320                 wfDeprecated( __METHOD__, '1.19' );
 321                 $this->fetchContent();
 322         }
 323
 324         /**
 325          * Get text of an article from database
 326          * Does *NOT* follow redirects.
 327          *
 328          * @protected
 329          * @note This is really internal functionality that should really NOT be
 330          * used by other functions. For accessing article content, use the WikiPage
 331          * class, especially WikiBase::getContent(). However, a lot of legacy code
 332          * uses this method to retrieve page text from the database, so the function
 333          * has to remain public for now.
 334          *
 335          * @return string|bool String containing article contents, or false if null
 336          * @deprecated since 1.21, use WikiPage::getContent() instead
 337          */
 338         function fetchContent() { #BC cruft!
 339                 ContentHandler::deprecated( __METHOD__, '1.21' );
 340
 341                 if ( $this->mContentLoaded && $this->mContent ) {
 342                         return $this->mContent;
 343                 }
 344
 345                 $content = $this->fetchContentObject();
 346
 347                 if ( !$content ) {
 348                         return false;
 349                 }
 350
 351                 // @todo Get rid of mContent everywhere!
 352                 $this->mContent = ContentHandler::getContentText( $content );
 353                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 354
 355                 return $this->mContent;
 356         }
 357
 358         /**
 359          * Get text content object
 360          * Does *NOT* follow redirects.
 361          * @todo When is this null?
 362          *
 363          * @note Code that wants to retrieve page content from the database should
 364          * use WikiPage::getContent().
 365          *
 366          * @return Content|null|bool
 367          *
 368          * @since 1.21
 369          */
 370         protected function fetchContentObject() {
 371                 if ( $this->mContentLoaded ) {
 372                         return $this->mContentObject;
 373                 }
 374
 375                 $this->mContentLoaded = true;
 376                 $this->mContent = null;
 377
 378                 $oldid = $this->getOldID();
 379
 380                 # Pre-fill content with error message so that if something
 381                 # fails we'll have something telling us what we intended.
 382                 //XXX: this isn't page content but a UI message. horrible.
 383                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 384
 385                 if ( $oldid ) {
 386                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 387                         if ( !$this->mRevision ) {
 388                                 $this->mRevision = Revision::newFromId( $oldid );
 389                                 if ( !$this->mRevision ) {
 390                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 391                                         return false;
 392                                 }
 393                         }
 394                 } else {
 395                         if ( !$this->mPage->getLatest() ) {
 396                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 397                                         $this->getTitle()->getPrefixedText() . "\n" );
 398                                 return false;
 399                         }
 400
 401                         $this->mRevision = $this->mPage->getRevision();
 402
 403                         if ( !$this->mRevision ) {
 404                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " .
 405                                         $this->mPage->getLatest() . "\n" );
 406                                 return false;
 407                         }
 408                 }
 409
 410                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 411                 // We should instead work with the Revision object when we need it...
 412                 // Loads if user is allowed
 413                 $content = $this->mRevision->getContent(
 414                         Revision::FOR_THIS_USER,
 415                         $this->getContext()->getUser()
 416                 );
 417
 418                 if ( !$content ) {
 419                         wfDebug( __METHOD__ . " failed to retrieve content of revision " .
 420                                 $this->mRevision->getId() . "\n" );
 421                         return false;
 422                 }
 423
 424                 $this->mContentObject = $content;
 425                 $this->mRevIdFetched = $this->mRevision->getId();
 426
 427                 Hooks::run( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 428
 429                 return $this->mContentObject;
 430         }
 431
 432         /**
 433          * Returns true if the currently-referenced revision is the current edit
 434          * to this page (and it exists).
 435          * @return bool
 436          */
 437         public function isCurrent() {
 438                 # If no oldid, this is the current version.
 439                 if ( $this->getOldID() == 0 ) {
 440                         return true;
 441                 }
 442
 443                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 444         }
 445
 446         /**
 447          * Get the fetched Revision object depending on request parameters or null
 448          * on failure.
 449          *
 450          * @since 1.19
 451          * @return Revision|null
 452          */
 453         public function getRevisionFetched() {
 454                 $this->fetchContentObject();
 455
 456                 return $this->mRevision;
 457         }
 458
 459         /**
 460          * Use this to fetch the rev ID used on page views
 461          *
 462          * @return int Revision ID of last article revision
 463          */
 464         public function getRevIdFetched() {
 465                 if ( $this->mRevIdFetched ) {
 466                         return $this->mRevIdFetched;
 467                 } else {
 468                         return $this->mPage->getLatest();
 469                 }
 470         }
 471
 472         /**
 473          * This is the default action of the index.php entry point: just view the
 474          * page of the given title.
 475          */
 476         public function view() {
 477                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar, $wgMaxRedirects;
 478
 479                 # Get variables from query string
 480                 # As side effect this will load the revision and update the title
 481                 # in a revision ID is passed in the request, so this should remain
 482                 # the first call of this method even if $oldid is used way below.
 483                 $oldid = $this->getOldID();
 484
 485                 $user = $this->getContext()->getUser();
 486                 # Another whitelist check in case getOldID() is altering the title
 487                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 488                 if ( count( $permErrors ) ) {
 489                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 490                         throw new PermissionsError( 'read', $permErrors );
 491                 }
 492
 493                 $outputPage = $this->getContext()->getOutput();
 494                 # getOldID() may as well want us to redirect somewhere else
 495                 if ( $this->mRedirectUrl ) {
 496                         $outputPage->redirect( $this->mRedirectUrl );
 497                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 498
 499                         return;
 500                 }
 501
 502                 # If we got diff in the query, we want to see a diff page instead of the article.
 503                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 504                         wfDebug( __METHOD__ . ": showing diff page\n" );
 505                         $this->showDiffPage();
 506
 507                         return;
 508                 }
 509
 510                 # Set page title (may be overridden by DISPLAYTITLE)
 511                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 512
 513                 $outputPage->setArticleFlag( true );
 514                 # Allow frames by default
 515                 $outputPage->allowClickjacking();
 516
 517                 $parserCache = ParserCache::singleton();
 518
 519                 $parserOptions = $this->getParserOptions();
 520                 # Render printable version, use printable version cache
 521                 if ( $outputPage->isPrintable() ) {
 522                         $parserOptions->setIsPrintable( true );
 523                         $parserOptions->setEditSection( false );
 524                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 525                         $parserOptions->setEditSection( false );
 526                 }
 527
 528                 # Try client and file cache
 529                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 530                         if ( $wgUseETag ) {
 531                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 532                         }
 533
 534                         # Use the greatest of the page's timestamp or the timestamp of any
 535                         # redirect in the chain (bug 67849)
 536                         $timestamp = $this->mPage->getTouched();
 537                         if ( isset( $this->mRedirectedFrom ) ) {
 538                                 $timestamp = max( $timestamp, $this->mRedirectedFrom->getTouched() );
 539
 540                                 # If there can be more than one redirect in the chain, we have
 541                                 # to go through the whole chain too in case an intermediate
 542                                 # redirect was changed.
 543                                 if ( $wgMaxRedirects > 1 ) {
 544                                         $titles = Revision::newFromTitle( $this->mRedirectedFrom )
 545                                                 ->getContent( Revision::FOR_THIS_USER, $user )
 546                                                 ->getRedirectChain();
 547                                         $thisTitle = $this->getTitle();
 548                                         foreach ( $titles as $title ) {
 549                                                 if ( Title::compare( $title, $thisTitle ) === 0 ) {
 550                                                         break;
 551                                                 }
 552                                                 $timestamp = max( $timestamp, $title->getTouched() );
 553                                         }
 554                                 }
 555                         }
 556
 557                         # Is it client cached?
 558                         if ( $outputPage->checkLastModified( $timestamp ) ) {
 559                                 wfDebug( __METHOD__ . ": done 304\n" );
 560
 561                                 return;
 562                         # Try file cache
 563                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 564                                 wfDebug( __METHOD__ . ": done file cache\n" );
 565                                 # tell wgOut that output is taken care of
 566                                 $outputPage->disable();
 567                                 $this->mPage->doViewUpdates( $user, $oldid );
 568
 569                                 return;
 570                         }
 571                 }
 572
 573                 # Should the parser cache be used?
 574                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 575                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 576                 if ( $user->getStubThreshold() ) {
 577                         wfIncrStats( 'pcache_miss_stub' );
 578                 }
 579
 580                 $this->showRedirectedFromHeader();
 581                 $this->showNamespaceHeader();
 582
 583                 # Iterate through the possible ways of constructing the output text.
 584                 # Keep going until $outputDone is set, or we run out of things to do.
 585                 $pass = 0;
 586                 $outputDone = false;
 587                 $this->mParserOutput = false;
 588
 589                 while ( !$outputDone && ++$pass ) {
 590                         switch ( $pass ) {
 591                                 case 1:
 592                                         Hooks::run( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 593                                         break;
 594                                 case 2:
 595                                         # Early abort if the page doesn't exist
 596                                         if ( !$this->mPage->exists() ) {
 597                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 598                                                 $this->showMissingArticle();
 599                                                 $this->mPage->doViewUpdates( $user );
 600                                                 return;
 601                                         }
 602
 603                                         # Try the parser cache
 604                                         if ( $useParserCache ) {
 605                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 606
 607                                                 if ( $this->mParserOutput !== false ) {
 608                                                         if ( $oldid ) {
 609                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 610                                                                 $this->setOldSubtitle( $oldid );
 611                                                         } else {
 612                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 613                                                         }
 614                                                         $outputPage->addParserOutput( $this->mParserOutput );
 615                                                         # Ensure that UI elements requiring revision ID have
 616                                                         # the correct version information.
 617                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 618                                                         # Preload timestamp to avoid a DB hit
 619                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 620                                                         if ( $cachedTimestamp !== null ) {
 621                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 622                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 623                                                         }
 624                                                         $outputDone = true;
 625                                                 }
 626                                         }
 627                                         break;
 628                                 case 3:
 629                                         # This will set $this->mRevision if needed
 630                                         $this->fetchContentObject();
 631
 632                                         # Are we looking at an old revision
 633                                         if ( $oldid && $this->mRevision ) {
 634                                                 $this->setOldSubtitle( $oldid );
 635
 636                                                 if ( !$this->showDeletedRevisionHeader() ) {
 637                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 638                                                         return;
 639                                                 }
 640                                         }
 641
 642                                         # Ensure that UI elements requiring revision ID have
 643                                         # the correct version information.
 644                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 645                                         # Preload timestamp to avoid a DB hit
 646                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 647
 648                                         # Pages containing custom CSS or JavaScript get special treatment
 649                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 650                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 651                                                 $this->showCssOrJsPage();
 652                                                 $outputDone = true;
 653                                         } elseif ( !Hooks::run( 'ArticleContentViewCustom',
 654                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 655
 656                                                 # Allow extensions do their own custom view for certain pages
 657                                                 $outputDone = true;
 658                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 659                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 660
 661                                                 # Allow extensions do their own custom view for certain pages
 662                                                 $outputDone = true;
 663                                         }
 664                                         break;
 665                                 case 4:
 666                                         # Run the parse, protected by a pool counter
 667                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 668
 669                                         $content = $this->getContentObject();
 670                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 671                                                 $this->getRevIdFetched(), $useParserCache, $content );
 672
 673                                         if ( !$poolArticleView->execute() ) {
 674                                                 $error = $poolArticleView->getError();
 675                                                 if ( $error ) {
 676                                                         $outputPage->clearHTML(); // for release() errors
 677                                                         $outputPage->enableClientCache( false );
 678                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 679
 680                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 681                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 682                                                 }
 683                                                 # Connection or timeout error
 684                                                 return;
 685                                         }
 686
 687                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 688                                         $outputPage->addParserOutput( $this->mParserOutput );
 689                                         if ( $content->getRedirectTarget() ) {
 690                                                 $outputPage->addSubtitle( "<span id=\"redirectsub\">" .
 691                                                         $this->getContext()->msg( 'redirectpagesub' )->parse() . "</span>" );
 692                                         }
 693
 694                                         # Don't cache a dirty ParserOutput object
 695                                         if ( $poolArticleView->getIsDirty() ) {
 696                                                 $outputPage->setSquidMaxage( 0 );
 697                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 698                                                         "sending anyway due to pool overload-->\n" );
 699                                         }
 700
 701                                         $outputDone = true;
 702                                         break;
 703                                 # Should be unreachable, but just in case...
 704                                 default:
 705                                         break 2;
 706                         }
 707                 }
 708
 709                 # Get the ParserOutput actually *displayed* here.
 710                 # Note that $this->mParserOutput is the *current* version output.
 711                 $pOutput = ( $outputDone instanceof ParserOutput )
 712                         ? $outputDone // object fetched by hook
 713                         : $this->mParserOutput;
 714
 715                 # Adjust title for main page & pages with displaytitle
 716                 if ( $pOutput ) {
 717                         $this->adjustDisplayTitle( $pOutput );
 718                 }
 719
 720                 # For the main page, overwrite the <title> element with the con-
 721                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 722                 # that's not empty).
 723                 # This message always exists because it is in the i18n files
 724                 if ( $this->getTitle()->isMainPage() ) {
 725                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 726                         if ( !$msg->isDisabled() ) {
 727                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 728                         }
 729                 }
 730
 731                 # Check for any __NOINDEX__ tags on the page using $pOutput
 732                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 733                 $outputPage->setIndexPolicy( $policy['index'] );
 734                 $outputPage->setFollowPolicy( $policy['follow'] );
 735
 736                 $this->showViewFooter();
 737                 $this->mPage->doViewUpdates( $user, $oldid );
 738
 739                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 740
 741         }
 742
 743         /**
 744          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 745          * @param ParserOutput $pOutput
 746          */
 747         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 748                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 749                 $titleText = $pOutput->getTitleText();
 750                 if ( strval( $titleText ) !== '' ) {
 751                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 752                 }
 753         }
 754
 755         /**
 756          * Show a diff page according to current request variables. For use within
 757          * Article::view() only, other callers should use the DifferenceEngine class.
 758          *
 759          * @todo Make protected
 760          */
 761         public function showDiffPage() {
 762                 $request = $this->getContext()->getRequest();
 763                 $user = $this->getContext()->getUser();
 764                 $diff = $request->getVal( 'diff' );
 765                 $rcid = $request->getVal( 'rcid' );
 766                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 767                 $purge = $request->getVal( 'action' ) == 'purge';
 768                 $unhide = $request->getInt( 'unhide' ) == 1;
 769                 $oldid = $this->getOldID();
 770
 771                 $rev = $this->getRevisionFetched();
 772
 773                 if ( !$rev ) {
 774                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 775                         $msg = $this->getContext()->msg( 'difference-missing-revision' )
 776                                 ->params( $oldid )
 777                                 ->numParams( 1 )
 778                                 ->parseAsBlock();
 779                         $this->getContext()->getOutput()->addHtml( $msg );
 780                         return;
 781                 }
 782
 783                 $contentHandler = $rev->getContentHandler();
 784                 $de = $contentHandler->createDifferenceEngine(
 785                         $this->getContext(),
 786                         $oldid,
 787                         $diff,
 788                         $rcid,
 789                         $purge,
 790                         $unhide
 791                 );
 792
 793                 // DifferenceEngine directly fetched the revision:
 794                 $this->mRevIdFetched = $de->mNewid;
 795                 $de->showDiffPage( $diffOnly );
 796
 797                 // Run view updates for the newer revision being diffed (and shown
 798                 // below the diff if not $diffOnly).
 799                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 800                 // New can be false, convert it to 0 - this conveniently means the latest revision
 801                 $this->mPage->doViewUpdates( $user, (int)$new );
 802         }
 803
 804         /**
 805          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 806          * Article::view() only.
 807          *
 808          * This exists mostly to serve the deprecated ShowRawCssJs hook (used to customize these views).
 809          * It has been replaced by the ContentGetParserOutput hook, which lets you do the same but with
 810          * more flexibility.
 811          *
 812          * @param bool $showCacheHint Whether to show a message telling the user
 813          *   to clear the browser cache (default: true).
 814          */
 815         protected function showCssOrJsPage( $showCacheHint = true ) {
 816                 $outputPage = $this->getContext()->getOutput();
 817
 818                 if ( $showCacheHint ) {
 819                         $dir = $this->getContext()->getLanguage()->getDir();
 820                         $lang = $this->getContext()->getLanguage()->getHtmlCode();
 821
 822                         $outputPage->wrapWikiMsg(
 823                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 824                                 'clearyourcache'
 825                         );
 826                 }
 827
 828                 $this->fetchContentObject();
 829
 830                 if ( $this->mContentObject ) {
 831                         // Give hooks a chance to customise the output
 832                         if ( ContentHandler::runLegacyHooks(
 833                                 'ShowRawCssJs',
 834                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 835                         ) {
 836                                 // If no legacy hooks ran, display the content of the parser output, including RL modules,
 837                                 // but excluding metadata like categories and language links
 838                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 839                                 $outputPage->addParserOutputContent( $po );
 840                         }
 841                 }
 842         }
 843
 844         /**
 845          * Get the robot policy to be used for the current view
 846          * @param string $action The action= GET parameter
 847          * @param ParserOutput|null $pOutput
 848          * @return array The policy that should be set
 849          * @todo actions other than 'view'
 850          */
 851         public function getRobotPolicy( $action, $pOutput = null ) {
 852                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 853
 854                 $ns = $this->getTitle()->getNamespace();
 855
 856                 # Don't index user and user talk pages for blocked users (bug 11443)
 857                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 858                         $specificTarget = null;
 859                         $vagueTarget = null;
 860                         $titleText = $this->getTitle()->getText();
 861                         if ( IP::isValid( $titleText ) ) {
 862                                 $vagueTarget = $titleText;
 863                         } else {
 864                                 $specificTarget = $titleText;
 865                         }
 866                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 867                                 return array(
 868                                         'index' => 'noindex',
 869                                         'follow' => 'nofollow'
 870                                 );
 871                         }
 872                 }
 873
 874                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 875                         # Non-articles (special pages etc), and old revisions
 876                         return array(
 877                                 'index' => 'noindex',
 878                                 'follow' => 'nofollow'
 879                         );
 880                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 881                         # Discourage indexing of printable versions, but encourage following
 882                         return array(
 883                                 'index' => 'noindex',
 884                                 'follow' => 'follow'
 885                         );
 886                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 887                         # For ?curid=x urls, disallow indexing
 888                         return array(
 889                                 'index' => 'noindex',
 890                                 'follow' => 'follow'
 891                         );
 892                 }
 893
 894                 # Otherwise, construct the policy based on the various config variables.
 895                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 896
 897                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 898                         # Honour customised robot policies for this namespace
 899                         $policy = array_merge(
 900                                 $policy,
 901                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 902                         );
 903                 }
 904                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 905                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 906                         # a final sanity check that we have really got the parser output.
 907                         $policy = array_merge(
 908                                 $policy,
 909                                 array( 'index' => $pOutput->getIndexPolicy() )
 910                         );
 911                 }
 912
 913                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 914                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 915                         $policy = array_merge(
 916                                 $policy,
 917                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 918                         );
 919                 }
 920
 921                 return $policy;
 922         }
 923
 924         /**
 925          * Converts a String robot policy into an associative array, to allow
 926          * merging of several policies using array_merge().
 927          * @param array|string $policy Returns empty array on null/false/'', transparent
 928          *   to already-converted arrays, converts string.
 929          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 930          */
 931         public static function formatRobotPolicy( $policy ) {
 932                 if ( is_array( $policy ) ) {
 933                         return $policy;
 934                 } elseif ( !$policy ) {
 935                         return array();
 936                 }
 937
 938                 $policy = explode( ',', $policy );
 939                 $policy = array_map( 'trim', $policy );
 940
 941                 $arr = array();
 942                 foreach ( $policy as $var ) {
 943                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 944                                 $arr['index'] = $var;
 945                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 946                                 $arr['follow'] = $var;
 947                         }
 948                 }
 949
 950                 return $arr;
 951         }
 952
 953         /**
 954          * If this request is a redirect view, send "redirected from" subtitle to
 955          * the output. Returns true if the header was needed, false if this is not
 956          * a redirect view. Handles both local and remote redirects.
 957          *
 958          * @return bool
 959          */
 960         public function showRedirectedFromHeader() {
 961                 global $wgRedirectSources;
 962                 $outputPage = $this->getContext()->getOutput();
 963
 964                 $request = $this->getContext()->getRequest();
 965                 $rdfrom = $request->getVal( 'rdfrom' );
 966
 967                 // Construct a URL for the current page view, but with the target title
 968                 $query = $request->getValues();
 969                 unset( $query['rdfrom'] );
 970                 unset( $query['title'] );
 971                 if ( $this->getTitle()->isRedirect() ) {
 972                         // Prevent double redirects
 973                         $query['redirect'] = 'no';
 974                 }
 975                 $redirectTargetUrl = $this->getTitle()->getLinkURL( $query );
 976
 977                 if ( isset( $this->mRedirectedFrom ) ) {
 978                         // This is an internally redirected page view.
 979                         // We'll need a backlink to the source page for navigation.
 980                         if ( Hooks::run( 'ArticleViewRedirect', array( &$this ) ) ) {
 981                                 $redir = Linker::linkKnown(
 982                                         $this->mRedirectedFrom,
 983                                         null,
 984                                         array(),
 985                                         array( 'redirect' => 'no' )
 986                                 );
 987
 988                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
 989                                         wfMessage( 'redirectedfrom' )->rawParams( $redir )->parse()
 990                                 . "</span>" );
 991
 992                                 // Add the script to update the displayed URL and
 993                                 // set the fragment if one was specified in the redirect
 994                                 $outputPage->addJsConfigVars( array(
 995                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
 996                                 ) );
 997                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
 998
 999                                 // Add a <link rel="canonical"> tag
1000                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
1001
1002                                 // Tell the output object that the user arrived at this article through a redirect
1003                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1004
1005                                 return true;
1006                         }
1007                 } elseif ( $rdfrom ) {
1008                         // This is an externally redirected view, from some other wiki.
1009                         // If it was reported from a trusted site, supply a backlink.
1010                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1011                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1012                                 $outputPage->addSubtitle( "<span class=\"mw-redirectedfrom\">" .
1013                                         wfMessage( 'redirectedfrom' )->rawParams( $redir )->parse()
1014                                 . "</span>" );
1015
1016                                 // Add the script to update the displayed URL
1017                                 $outputPage->addJsConfigVars( array(
1018                                         'wgInternalRedirectTargetUrl' => $redirectTargetUrl,
1019                                 ) );
1020                                 $outputPage->addModules( 'mediawiki.action.view.redirect' );
1021
1022                                 return true;
1023                         }
1024                 }
1025
1026                 return false;
1027         }
1028
1029         /**
1030          * Show a header specific to the namespace currently being viewed, like
1031          * [[MediaWiki:Talkpagetext]]. For Article::view().
1032          */
1033         public function showNamespaceHeader() {
1034                 if ( $this->getTitle()->isTalkPage() ) {
1035                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1036                                 $this->getContext()->getOutput()->wrapWikiMsg(
1037                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1038                                         array( 'talkpageheader' )
1039                                 );
1040                         }
1041                 }
1042         }
1043
1044         /**
1045          * Show the footer section of an ordinary page view
1046          */
1047         public function showViewFooter() {
1048                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1049                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1050                         && IP::isValid( $this->getTitle()->getText() )
1051                 ) {
1052                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1053                 }
1054
1055                 // Show a footer allowing the user to patrol the shown revision or page if possible
1056                 $patrolFooterShown = $this->showPatrolFooter();
1057
1058                 Hooks::run( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1059         }
1060
1061         /**
1062          * If patrol is possible, output a patrol UI box. This is called from the
1063          * footer section of ordinary page views. If patrol is not possible or not
1064          * desired, does nothing.
1065          * Side effect: When the patrol link is build, this method will call
1066          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1067          *
1068          * @return bool
1069          */
1070         public function showPatrolFooter() {
1071                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1072
1073                 $outputPage = $this->getContext()->getOutput();
1074                 $user = $this->getContext()->getUser();
1075                 $cache = wfGetMainCache();
1076                 $rc = false;
1077
1078                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1079                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1080                 ) {
1081                         // Patrolling is disabled or the user isn't allowed to
1082                         return false;
1083                 }
1084
1085                 // New page patrol: Get the timestamp of the oldest revison which
1086                 // the revision table holds for the given page. Then we look
1087                 // whether it's within the RC lifespan and if it is, we try
1088                 // to get the recentchanges row belonging to that entry
1089                 // (with rc_new = 1).
1090
1091                 // Check for cached results
1092                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1093                         return false;
1094                 }
1095
1096                 if ( $this->mRevision
1097                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1098                 ) {
1099                         // The current revision is already older than what could be in the RC table
1100                         // 6h tolerance because the RC might not be cleaned out regularly
1101                         return false;
1102                 }
1103
1104                 $dbr = wfGetDB( DB_SLAVE );
1105                 $oldestRevisionTimestamp = $dbr->selectField(
1106                         'revision',
1107                         'MIN( rev_timestamp )',
1108                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1109                         __METHOD__
1110                 );
1111
1112                 if ( $oldestRevisionTimestamp
1113                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1114                 ) {
1115                         // 6h tolerance because the RC might not be cleaned out regularly
1116                         $rc = RecentChange::newFromConds(
1117                                 array(
1118                                         'rc_new' => 1,
1119                                         'rc_timestamp' => $oldestRevisionTimestamp,
1120                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1121                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1122                                         'rc_patrolled' => 0
1123                                 ),
1124                                 __METHOD__,
1125                                 array( 'USE INDEX' => 'new_name_timestamp' )
1126                         );
1127                 }
1128
1129                 if ( !$rc ) {
1130                         // No RC entry around
1131
1132                         // Cache the information we gathered above in case we can't patrol
1133                         // Don't cache in case we can patrol as this could change
1134                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1135
1136                         return false;
1137                 }
1138
1139                 if ( $rc->getPerformer()->equals( $user ) ) {
1140                         // Don't show a patrol link for own creations. If the user could
1141                         // patrol them, they already would be patrolled
1142                         return false;
1143                 }
1144
1145                 $rcid = $rc->getAttribute( 'rc_id' );
1146
1147                 $token = $user->getEditToken( $rcid );
1148
1149                 $outputPage->preventClickjacking();
1150                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1151                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1152                 }
1153
1154                 $link = Linker::linkKnown(
1155                         $this->getTitle(),
1156                         wfMessage( 'markaspatrolledtext' )->escaped(),
1157                         array(),
1158                         array(
1159                                 'action' => 'markpatrolled',
1160                                 'rcid' => $rcid,
1161                                 'token' => $token,
1162                         )
1163                 );
1164
1165                 $outputPage->addHTML(
1166                         "<div class='patrollink'>" .
1167                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1168                         '</div>'
1169                 );
1170
1171                 return true;
1172         }
1173
1174         /**
1175          * Show the error text for a missing article. For articles in the MediaWiki
1176          * namespace, show the default message text. To be called from Article::view().
1177          */
1178         public function showMissingArticle() {
1179                 global $wgSend404Code;
1180
1181                 $outputPage = $this->getContext()->getOutput();
1182                 // Whether the page is a root user page of an existing user (but not a subpage)
1183                 $validUserPage = false;
1184
1185                 $title = $this->getTitle();
1186
1187                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1188                 if ( $title->getNamespace() == NS_USER
1189                         || $title->getNamespace() == NS_USER_TALK
1190                 ) {
1191                         $parts = explode( '/', $title->getText() );
1192                         $rootPart = $parts[0];
1193                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1194                         $ip = User::isIP( $rootPart );
1195                         $block = Block::newFromTarget( $user, $user );
1196
1197                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1198                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1199                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1200                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
1201                                 # Show log extract if the user is currently blocked
1202                                 LogEventsList::showLogExtract(
1203                                         $outputPage,
1204                                         'block',
1205                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
1206                                         '',
1207                                         array(
1208                                                 'lim' => 1,
1209                                                 'showIfEmpty' => false,
1210                                                 'msgKey' => array(
1211                                                         'blocked-notice-logextract',
1212                                                         $user->getName() # Support GENDER in notice
1213                                                 )
1214                                         )
1215                                 );
1216                                 $validUserPage = !$title->isSubpage();
1217                         } else {
1218                                 $validUserPage = !$title->isSubpage();
1219                         }
1220                 }
1221
1222                 Hooks::run( 'ShowMissingArticle', array( $this ) );
1223
1224                 // Give extensions a chance to hide their (unrelated) log entries
1225                 $logTypes = array( 'delete', 'move' );
1226                 $conds = array( "log_action != 'revision'" );
1227                 Hooks::run( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1228
1229                 # Show delete and move logs
1230                 LogEventsList::showLogExtract( $outputPage, $logTypes, $title, '',
1231                         array( 'lim' => 10,
1232                                 'conds' => $conds,
1233                                 'showIfEmpty' => false,
1234                                 'msgKey' => array( 'moveddeleted-notice' ) )
1235                 );
1236
1237                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1238                         // If there's no backing content, send a 404 Not Found
1239                         // for better machine handling of broken links.
1240                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1241                 }
1242
1243                 // Also apply the robot policy for nonexisting pages (even if a 404 was used for sanity)
1244                 $policy = $this->getRobotPolicy( 'view' );
1245                 $outputPage->setIndexPolicy( $policy['index'] );
1246                 $outputPage->setFollowPolicy( $policy['follow'] );
1247
1248                 $hookResult = Hooks::run( 'BeforeDisplayNoArticleText', array( $this ) );
1249
1250                 if ( !$hookResult ) {
1251                         return;
1252                 }
1253
1254                 # Show error message
1255                 $oldid = $this->getOldID();
1256                 if ( $oldid ) {
1257                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1258                 } elseif ( $title->getNamespace() === NS_MEDIAWIKI ) {
1259                         // Use the default message text
1260                         $text = $title->getDefaultMessageText();
1261                 } elseif ( $title->quickUserCan( 'create', $this->getContext()->getUser() )
1262                         && $title->quickUserCan( 'edit', $this->getContext()->getUser() )
1263                 ) {
1264                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1265                         $text = wfMessage( $message )->plain();
1266                 } else {
1267                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1268                 }
1269                 $text = "<div class='noarticletext'>\n$text\n</div>";
1270
1271                 $outputPage->addWikiText( $text );
1272         }
1273
1274         /**
1275          * If the revision requested for view is deleted, check permissions.
1276          * Send either an error message or a warning header to the output.
1277          *
1278          * @return bool True if the view is allowed, false if not.
1279          */
1280         public function showDeletedRevisionHeader() {
1281                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1282                         // Not deleted
1283                         return true;
1284                 }
1285
1286                 $outputPage = $this->getContext()->getOutput();
1287                 $user = $this->getContext()->getUser();
1288                 // If the user is not allowed to see it...
1289                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1290                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1291                                 'rev-deleted-text-permission' );
1292
1293                         return false;
1294                 // If the user needs to confirm that they want to see it...
1295                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1296                         # Give explanation and add a link to view the revision...
1297                         $oldid = intval( $this->getOldID() );
1298                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1299                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1300                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1301                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1302                                 array( $msg, $link ) );
1303
1304                         return false;
1305                 // We are allowed to see...
1306                 } else {
1307                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1308                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1309                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1310
1311                         return true;
1312                 }
1313         }
1314
1315         /**
1316          * Generate the navigation links when browsing through an article revisions
1317          * It shows the information as:
1318          *   Revision as of \<date\>; view current revision
1319          *   \<- Previous version | Next Version -\>
1320          *
1321          * @param int $oldid Revision ID of this article revision
1322          */
1323         public function setOldSubtitle( $oldid = 0 ) {
1324                 if ( !Hooks::run( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1325                         return;
1326                 }
1327
1328                 $context = $this->getContext();
1329                 $unhide = $context->getRequest()->getInt( 'unhide' ) == 1;
1330
1331                 # Cascade unhide param in links for easy deletion browsing
1332                 $extraParams = array();
1333                 if ( $unhide ) {
1334                         $extraParams['unhide'] = 1;
1335                 }
1336
1337                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1338                         $revision = $this->mRevision;
1339                 } else {
1340                         $revision = Revision::newFromId( $oldid );
1341                 }
1342
1343                 $timestamp = $revision->getTimestamp();
1344
1345                 $current = ( $oldid == $this->mPage->getLatest() );
1346                 $language = $context->getLanguage();
1347                 $user = $context->getUser();
1348
1349                 $td = $language->userTimeAndDate( $timestamp, $user );
1350                 $tddate = $language->userDate( $timestamp, $user );
1351                 $tdtime = $language->userTime( $timestamp, $user );
1352
1353                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1354                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1355
1356                 $infomsg = $current && !$context->msg( 'revision-info-current' )->isDisabled()
1357                         ? 'revision-info-current'
1358                         : 'revision-info';
1359
1360                 $outputPage = $context->getOutput();
1361                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" .
1362                         $context->msg( $infomsg, $td )
1363                                 ->rawParams( $userlinks )
1364                                 ->params( $revision->getID(), $tddate, $tdtime, $revision->getUserText() )
1365                                 ->rawParams( Linker::revComment( $revision, true, true ) )
1366                                 ->parse() .
1367                         "</div>"
1368                 );
1369
1370                 $lnk = $current
1371                         ? $context->msg( 'currentrevisionlink' )->escaped()
1372                         : Linker::linkKnown(
1373                                 $this->getTitle(),
1374                                 $context->msg( 'currentrevisionlink' )->escaped(),
1375                                 array(),
1376                                 $extraParams
1377                         );
1378                 $curdiff = $current
1379                         ? $context->msg( 'diff' )->escaped()
1380                         : Linker::linkKnown(
1381                                 $this->getTitle(),
1382                                 $context->msg( 'diff' )->escaped(),
1383                                 array(),
1384                                 array(
1385                                         'diff' => 'cur',
1386                                         'oldid' => $oldid
1387                                 ) + $extraParams
1388                         );
1389                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1390                 $prevlink = $prev
1391                         ? Linker::linkKnown(
1392                                 $this->getTitle(),
1393                                 $context->msg( 'previousrevision' )->escaped(),
1394                                 array(),
1395                                 array(
1396                                         'direction' => 'prev',
1397                                         'oldid' => $oldid
1398                                 ) + $extraParams
1399                         )
1400                         : $context->msg( 'previousrevision' )->escaped();
1401                 $prevdiff = $prev
1402                         ? Linker::linkKnown(
1403                                 $this->getTitle(),
1404                                 $context->msg( 'diff' )->escaped(),
1405                                 array(),
1406                                 array(
1407                                         'diff' => 'prev',
1408                                         'oldid' => $oldid
1409                                 ) + $extraParams
1410                         )
1411                         : $context->msg( 'diff' )->escaped();
1412                 $nextlink = $current
1413                         ? $context->msg( 'nextrevision' )->escaped()
1414                         : Linker::linkKnown(
1415                                 $this->getTitle(),
1416                                 $context->msg( 'nextrevision' )->escaped(),
1417                                 array(),
1418                                 array(
1419                                         'direction' => 'next',
1420                                         'oldid' => $oldid
1421                                 ) + $extraParams
1422                         );
1423                 $nextdiff = $current
1424                         ? $context->msg( 'diff' )->escaped()
1425                         : Linker::linkKnown(
1426                                 $this->getTitle(),
1427                                 $context->msg( 'diff' )->escaped(),
1428                                 array(),
1429                                 array(
1430                                         'diff' => 'next',
1431                                         'oldid' => $oldid
1432                                 ) + $extraParams
1433                         );
1434
1435                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1436                 if ( $cdel !== '' ) {
1437                         $cdel .= ' ';
1438                 }
1439
1440                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1441                         $context->msg( 'revision-nav' )->rawParams(
1442                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1443                         )->escaped() . "</div>" );
1444         }
1445
1446         /**
1447          * Return the HTML for the top of a redirect page
1448          *
1449          * Chances are you should just be using the ParserOutput from
1450          * WikitextContent::getParserOutput instead of calling this for redirects.
1451          *
1452          * @param Title|array $target Destination(s) to redirect
1453          * @param bool $appendSubtitle [optional]
1454          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1455          * @return string Containing HTML with redirect link
1456          */
1457         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1458                 $lang = $this->getTitle()->getPageLanguage();
1459                 $out = $this->getContext()->getOutput();
1460                 if ( $appendSubtitle ) {
1461                         $out->addSubtitle( wfMessage( 'redirectpagesub' ) );
1462                 }
1463                 $out->addModuleStyles( 'mediawiki.action.view.redirectPage' );
1464                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1465         }
1466
1467         /**
1468          * Return the HTML for the top of a redirect page
1469          *
1470          * Chances are you should just be using the ParserOutput from
1471          * WikitextContent::getParserOutput instead of calling this for redirects.
1472          *
1473          * @since 1.23
1474          * @param Language $lang
1475          * @param Title|array $target Destination(s) to redirect
1476          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1477          * @return string Containing HTML with redirect link
1478          */
1479         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1480                 if ( !is_array( $target ) ) {
1481                         $target = array( $target );
1482                 }
1483
1484                 $html = '<ul class="redirectText">';
1485                 /** @var Title $title */
1486                 foreach ( $target as $title ) {
1487                         $html .= '<li>' . Linker::link(
1488                                 $title,
1489                                 htmlspecialchars( $title->getFullText() ),
1490                                 array(),
1491                                 // Automatically append redirect=no to each link, since most of them are
1492                                 // redirect pages themselves.
1493                                 array( 'redirect' => 'no' ),
1494                                 ( $forceKnown ? array( 'known', 'noclasses' ) : array() )
1495                         ) . '</li>';
1496                 }
1497
1498                 $redirectToText = wfMessage( 'redirectto' )->inLanguage( $lang )->text();
1499
1500                 return '<div class="redirectMsg">' .
1501                         '<p>' . $redirectToText . '</p>' .
1502                         $html .
1503                         '</div>';
1504         }
1505
1506         /**
1507          * Handle action=render
1508          */
1509         public function render() {
1510                 $this->getContext()->getRequest()->response()->header( 'X-Robots-Tag: noindex' );
1511                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1512                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1513                 $this->view();
1514         }
1515
1516         /**
1517          * action=protect handler
1518          */
1519         public function protect() {
1520                 $form = new ProtectionForm( $this );
1521                 $form->execute();
1522         }
1523
1524         /**
1525          * action=unprotect handler (alias)
1526          */
1527         public function unprotect() {
1528                 $this->protect();
1529         }
1530
1531         /**
1532          * UI entry point for page deletion
1533          */
1534         public function delete() {
1535                 # This code desperately needs to be totally rewritten
1536
1537                 $title = $this->getTitle();
1538                 $context = $this->getContext();
1539                 $user = $context->getUser();
1540
1541                 # Check permissions
1542                 $permissionErrors = $title->getUserPermissionsErrors( 'delete', $user );
1543                 if ( count( $permissionErrors ) ) {
1544                         throw new PermissionsError( 'delete', $permissionErrors );
1545                 }
1546
1547                 # Read-only check...
1548                 if ( wfReadOnly() ) {
1549                         throw new ReadOnlyError;
1550                 }
1551
1552                 # Better double-check that it hasn't been deleted yet!
1553                 $this->mPage->loadPageData( 'fromdbmaster' );
1554                 if ( !$this->mPage->exists() ) {
1555                         $deleteLogPage = new LogPage( 'delete' );
1556                         $outputPage = $context->getOutput();
1557                         $outputPage->setPageTitle( $context->msg( 'cannotdelete-title', $title->getPrefixedText() ) );
1558                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1559                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1560                                 );
1561                         $outputPage->addHTML(
1562                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1563                         );
1564                         LogEventsList::showLogExtract(
1565                                 $outputPage,
1566                                 'delete',
1567                                 $title
1568                         );
1569
1570                         return;
1571                 }
1572
1573                 $request = $context->getRequest();
1574                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1575                 $deleteReason = $request->getText( 'wpReason' );
1576
1577                 if ( $deleteReasonList == 'other' ) {
1578                         $reason = $deleteReason;
1579                 } elseif ( $deleteReason != '' ) {
1580                         // Entry from drop down menu + additional comment
1581                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1582                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1583                 } else {
1584                         $reason = $deleteReasonList;
1585                 }
1586
1587                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1588                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1589                 ) {
1590                         # Flag to hide all contents of the archived revisions
1591                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1592
1593                         $this->doDelete( $reason, $suppress );
1594
1595                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1596
1597                         return;
1598                 }
1599
1600                 // Generate deletion reason
1601                 $hasHistory = false;
1602                 if ( !$reason ) {
1603                         try {
1604                                 $reason = $this->generateReason( $hasHistory );
1605                         } catch ( Exception $e ) {
1606                                 # if a page is horribly broken, we still want to be able to
1607                                 # delete it. So be lenient about errors here.
1608                                 wfDebug( "Error while building auto delete summary: $e" );
1609                                 $reason = '';
1610                         }
1611                 }
1612
1613                 // If the page has a history, insert a warning
1614                 if ( $hasHistory ) {
1615                         $title = $this->getTitle();
1616
1617                         // The following can use the real revision count as this is only being shown for users
1618                         // that can delete this page.
1619                         // This, as a side-effect, also makes sure that the following query isn't being run for
1620                         // pages with a larger history, unless the user has the 'bigdelete' right
1621                         // (and is about to delete this page).
1622                         $dbr = wfGetDB( DB_SLAVE );
1623                         $revisions = $edits = (int)$dbr->selectField(
1624                                 'revision',
1625                                 'COUNT(rev_page)',
1626                                 array( 'rev_page' => $title->getArticleID() ),
1627                                 __METHOD__
1628                         );
1629
1630                         // @todo FIXME: i18n issue/patchwork message
1631                         $context->getOutput()->addHTML(
1632                                 '<strong class="mw-delete-warning-revisions">' .
1633                                 $context->msg( 'historywarning' )->numParams( $revisions )->parse() .
1634                                 $context->msg( 'word-separator' )->escaped() . Linker::linkKnown( $title,
1635                                         $context->msg( 'history' )->escaped(),
1636                                         array( 'rel' => 'archives' ),
1637                                         array( 'action' => 'history' ) ) .
1638                                 '</strong>'
1639                         );
1640
1641                         if ( $title->isBigDeletion() ) {
1642                                 global $wgDeleteRevisionsLimit;
1643                                 $context->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1644                                         array(
1645                                                 'delete-warning-toobig',
1646                                                 $context->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1647                                         )
1648                                 );
1649                         }
1650                 }
1651
1652                 $this->confirmDelete( $reason );
1653         }
1654
1655         /**
1656          * Output deletion confirmation dialog
1657          * @todo FIXME: Move to another file?
1658          * @param string $reason Prefilled reason
1659          */
1660         public function confirmDelete( $reason ) {
1661                 wfDebug( "Article::confirmDelete\n" );
1662
1663                 $title = $this->getTitle();
1664                 $ctx = $this->getContext();
1665                 $outputPage = $ctx->getOutput();
1666                 $useMediaWikiUIEverywhere = $ctx->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1667                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $title->getPrefixedText() ) );
1668                 $outputPage->addBacklinkSubtitle( $title );
1669                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1670                 $backlinkCache = $title->getBacklinkCache();
1671                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1672                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1673                                 'deleting-backlinks-warning' );
1674                 }
1675                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1676
1677                 Hooks::run( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1678
1679                 $user = $this->getContext()->getUser();
1680
1681                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1682                         $suppress = Html::openElement( 'div', array( 'id' => 'wpDeleteSuppressRow' ) ) .
1683                                 "<strong>" .
1684                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1685                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1686                                         "</strong>" .
1687                                 Html::closeElement( 'div' );
1688                 } else {
1689                         $suppress = '';
1690                 }
1691                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $title );
1692
1693                 $form = Html::openElement( 'form', array( 'method' => 'post',
1694                         'action' => $title->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1695                         Html::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1696                         Html::element( 'legend', null, wfMessage( 'delete-legend' )->text() ) .
1697                         Html::openElement( 'div', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1698                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonListRow' ) ) .
1699                         Html::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1700                         '&nbsp;' .
1701                         Xml::listDropDown(
1702                                 'wpDeleteReasonList',
1703                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1704                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1705                                 '',
1706                                 'wpReasonDropDown',
1707                                 1
1708                         ) .
1709                         Html::closeElement( 'div' ) .
1710                         Html::openElement( 'div', array( 'id' => 'wpDeleteReasonRow' ) ) .
1711                         Html::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1712                         '&nbsp;' .
1713                         Html::input( 'wpReason', $reason, 'text', array(
1714                                 'size' => '60',
1715                                 'maxlength' => '255',
1716                                 'tabindex' => '2',
1717                                 'id' => 'wpReason',
1718                                 'class' => 'mw-ui-input-inline',
1719                                 'autofocus'
1720                         ) ) .
1721                         Html::closeElement( 'div' );
1722
1723                 # Disallow watching if user is not logged in
1724                 if ( $user->isLoggedIn() ) {
1725                         $form .=
1726                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1727                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) );
1728                 }
1729
1730                 $form .=
1731                                 Html::openElement( 'div' ) .
1732                                 $suppress .
1733                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1734                                                 array(
1735                                                         'name' => 'wpConfirmB',
1736                                                         'id' => 'wpConfirmB',
1737                                                         'tabindex' => '5',
1738                                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button mw-ui-destructive' : '',
1739                                                 )
1740                                         ) .
1741                                 Html::closeElement( 'div' ) .
1742                         Html::closeElement( 'div' ) .
1743                         Xml::closeElement( 'fieldset' ) .
1744                         Html::hidden(
1745                                 'wpEditToken',
1746                                 $user->getEditToken( array( 'delete', $title->getPrefixedText() ) )
1747                         ) .
1748                         Xml::closeElement( 'form' );
1749
1750                         if ( $user->isAllowed( 'editinterface' ) ) {
1751                                 $dropdownTitle = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1752                                 $link = Linker::link(
1753                                         $dropdownTitle,
1754                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1755                                         array(),
1756                                         array( 'action' => 'edit' )
1757                                 );
1758                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1759                         }
1760
1761                 $outputPage->addHTML( $form );
1762
1763                 $deleteLogPage = new LogPage( 'delete' );
1764                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1765                 LogEventsList::showLogExtract( $outputPage, 'delete', $title );
1766         }
1767
1768         /**
1769          * Perform a deletion and output success or failure messages
1770          * @param string $reason
1771          * @param bool $suppress
1772          */
1773         public function doDelete( $reason, $suppress = false ) {
1774                 $error = '';
1775                 $outputPage = $this->getContext()->getOutput();
1776                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1777
1778                 if ( $status->isGood() ) {
1779                         $deleted = $this->getTitle()->getPrefixedText();
1780
1781                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1782                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1783
1784                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1785
1786                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1787
1788                         Hooks::run( 'ArticleDeleteAfterSuccess', array( $this->getTitle(), $outputPage ) );
1789
1790                         $outputPage->returnToMain( false );
1791                 } else {
1792                         $outputPage->setPageTitle(
1793                                 wfMessage( 'cannotdelete-title',
1794                                         $this->getTitle()->getPrefixedText() )
1795                         );
1796
1797                         if ( $error == '' ) {
1798                                 $outputPage->addWikiText(
1799                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1800                                 );
1801                                 $deleteLogPage = new LogPage( 'delete' );
1802                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1803
1804                                 LogEventsList::showLogExtract(
1805                                         $outputPage,
1806                                         'delete',
1807                                         $this->getTitle()
1808                                 );
1809                         } else {
1810                                 $outputPage->addHTML( $error );
1811                         }
1812                 }
1813         }
1814
1815         /* Caching functions */
1816
1817         /**
1818          * checkLastModified returns true if it has taken care of all
1819          * output to the client that is necessary for this request.
1820          * (that is, it has sent a cached version of the page)
1821          *
1822          * @return bool True if cached version send, false otherwise
1823          */
1824         protected function tryFileCache() {
1825                 static $called = false;
1826
1827                 if ( $called ) {
1828                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1829                         return false;
1830                 }
1831
1832                 $called = true;
1833                 if ( $this->isFileCacheable() ) {
1834                         $cache = new HTMLFileCache( $this->getTitle(), 'view' );
1835                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1836                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1837                                 $cache->loadFromFileCache( $this->getContext() );
1838                                 return true;
1839                         } else {
1840                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1841                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1842                         }
1843                 } else {
1844                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1845                 }
1846
1847                 return false;
1848         }
1849
1850         /**
1851          * Check if the page can be cached
1852          * @return bool
1853          */
1854         public function isFileCacheable() {
1855                 $cacheable = false;
1856
1857                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1858                         $cacheable = $this->mPage->getID()
1859                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1860                         // Extension may have reason to disable file caching on some pages.
1861                         if ( $cacheable ) {
1862                                 $cacheable = Hooks::run( 'IsFileCacheable', array( &$this ) );
1863                         }
1864                 }
1865
1866                 return $cacheable;
1867         }
1868
1869         /**#@-*/
1870
1871         /**
1872          * Lightweight method to get the parser output for a page, checking the parser cache
1873          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1874          * consider, so it's not appropriate to use there.
1875          *
1876          * @since 1.16 (r52326) for LiquidThreads
1877          *
1878          * @param int|null $oldid Revision ID or null
1879          * @param User $user The relevant user
1880          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1881          */
1882         public function getParserOutput( $oldid = null, User $user = null ) {
1883                 //XXX: bypasses mParserOptions and thus setParserOptions()
1884
1885                 if ( $user === null ) {
1886                         $parserOptions = $this->getParserOptions();
1887                 } else {
1888                         $parserOptions = $this->mPage->makeParserOptions( $user );
1889                 }
1890
1891                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1892         }
1893
1894         /**
1895          * Override the ParserOptions used to render the primary article wikitext.
1896          *
1897          * @param ParserOptions $options
1898          * @throws MWException If the parser options where already initialized.
1899          */
1900         public function setParserOptions( ParserOptions $options ) {
1901                 if ( $this->mParserOptions ) {
1902                         throw new MWException( "can't change parser options after they have already been set" );
1903                 }
1904
1905                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1906                 $this->mParserOptions = clone $options;
1907         }
1908
1909         /**
1910          * Get parser options suitable for rendering the primary article wikitext
1911          * @return ParserOptions
1912          */
1913         public function getParserOptions() {
1914                 if ( !$this->mParserOptions ) {
1915                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1916                 }
1917                 // Clone to allow modifications of the return value without affecting cache
1918                 return clone $this->mParserOptions;
1919         }
1920
1921         /**
1922          * Sets the context this Article is executed in
1923          *
1924          * @param IContextSource $context
1925          * @since 1.18
1926          */
1927         public function setContext( $context ) {
1928                 $this->mContext = $context;
1929         }
1930
1931         /**
1932          * Gets the context this Article is executed in
1933          *
1934          * @return IContextSource
1935          * @since 1.18
1936          */
1937         public function getContext() {
1938                 if ( $this->mContext instanceof IContextSource ) {
1939                         return $this->mContext;
1940                 } else {
1941                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1942                                 "Return RequestContext::getMain(); for sanity\n" );
1943                         return RequestContext::getMain();
1944                 }
1945         }
1946
1947         /**
1948          * Use PHP's magic __get handler to handle accessing of
1949          * raw WikiPage fields for backwards compatibility.
1950          *
1951          * @param string $fname Field name
1952          * @return mixed
1953          */
1954         public function __get( $fname ) {
1955                 if ( property_exists( $this->mPage, $fname ) ) {
1956                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1957                         return $this->mPage->$fname;
1958                 }
1959                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1960         }
1961
1962         /**
1963          * Use PHP's magic __set handler to handle setting of
1964          * raw WikiPage fields for backwards compatibility.
1965          *
1966          * @param string $fname Field name
1967          * @param mixed $fvalue New value
1968          */
1969         public function __set( $fname, $fvalue ) {
1970                 if ( property_exists( $this->mPage, $fname ) ) {
1971                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1972                         $this->mPage->$fname = $fvalue;
1973                 // Note: extensions may want to toss on new fields
1974                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1975                         $this->mPage->$fname = $fvalue;
1976                 } else {
1977                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1978                 }
1979         }
1980
1981         /**
1982          * Use PHP's magic __call handler to transform instance calls to
1983          * WikiPage functions for backwards compatibility.
1984          *
1985          * @param string $fname Name of called method
1986          * @param array $args Arguments to the method
1987          * @return mixed
1988          */
1989         public function __call( $fname, $args ) {
1990                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1991                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1992                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1993                 }
1994                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1995         }
1996
1997         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1998
1999         /**
2000          * @param array $limit
2001          * @param array $expiry
2002          * @param bool $cascade
2003          * @param string $reason
2004          * @param User $user
2005          * @return Status
2006          */
2007         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2008                 $reason, User $user
2009         ) {
2010                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2011         }
2012
2013         /**
2014          * @param array $limit
2015          * @param string $reason
2016          * @param int $cascade
2017          * @param array $expiry
2018          * @return bool
2019          */
2020         public function updateRestrictions( $limit = array(), $reason = '',
2021                 &$cascade = 0, $expiry = array()
2022         ) {
2023                 return $this->mPage->doUpdateRestrictions(
2024                         $limit,
2025                         $expiry,
2026                         $cascade,
2027                         $reason,
2028                         $this->getContext()->getUser()
2029                 );
2030         }
2031
2032         /**
2033          * @param string $reason
2034          * @param bool $suppress
2035          * @param int $id
2036          * @param bool $commit
2037          * @param string $error
2038          * @return bool
2039          */
2040         public function doDeleteArticle( $reason, $suppress = false, $id = 0,
2041                 $commit = true, &$error = ''
2042         ) {
2043                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2044         }
2045
2046         /**
2047          * @param string $fromP
2048          * @param string $summary
2049          * @param string $token
2050          * @param bool $bot
2051          * @param array $resultDetails
2052          * @param User|null $user
2053          * @return array
2054          */
2055         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2056                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2057                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2058         }
2059
2060         /**
2061          * @param string $fromP
2062          * @param string $summary
2063          * @param bool $bot
2064          * @param array $resultDetails
2065          * @param User|null $guser
2066          * @return array
2067          */
2068         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2069                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2070                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2071         }
2072
2073         /**
2074          * @param bool $hasHistory
2075          * @return mixed
2076          */
2077         public function generateReason( &$hasHistory ) {
2078                 $title = $this->mPage->getTitle();
2079                 $handler = ContentHandler::getForTitle( $title );
2080                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2081         }
2082
2083         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2084
2085         /**
2086          * @return array
2087          *
2088          * @deprecated since 1.24, use WikiPage::selectFields() instead
2089          */
2090         public static function selectFields() {
2091                 wfDeprecated( __METHOD__, '1.24' );
2092                 return WikiPage::selectFields();
2093         }
2094
2095         /**
2096          * @param Title $title
2097          *
2098          * @deprecated since 1.24, use WikiPage::onArticleCreate() instead
2099          */
2100         public static function onArticleCreate( $title ) {
2101                 wfDeprecated( __METHOD__, '1.24' );
2102                 WikiPage::onArticleCreate( $title );
2103         }
2104
2105         /**
2106          * @param Title $title
2107          *
2108          * @deprecated since 1.24, use WikiPage::onArticleDelete() instead
2109          */
2110         public static function onArticleDelete( $title ) {
2111                 wfDeprecated( __METHOD__, '1.24' );
2112                 WikiPage::onArticleDelete( $title );
2113         }
2114
2115         /**
2116          * @param Title $title
2117          *
2118          * @deprecated since 1.24, use WikiPage::onArticleEdit() instead
2119          */
2120         public static function onArticleEdit( $title ) {
2121                 wfDeprecated( __METHOD__, '1.24' );
2122                 WikiPage::onArticleEdit( $title );
2123         }
2124
2125         /**
2126          * @param string $oldtext
2127          * @param string $newtext
2128          * @param int $flags
2129          * @return string
2130          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2131          */
2132         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2133                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2134         }
2135         // ******
2136 }