includes/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         /**@{{
  38          * @private
  39          */
  40
  41         /**
  42          * The context this Article is executed in
  43          * @var IContextSource $mContext
  44          */
  45         protected $mContext;
  46
  47         /**
  48          * The WikiPage object of this instance
  49          * @var WikiPage $mPage
  50          */
  51         protected $mPage;
  52
  53         /**
  54          * ParserOptions object for $wgUser articles
  55          * @var ParserOptions $mParserOptions
  56          */
  57         public $mParserOptions;
  58
  59         /**
  60          * Text of the revision we are working on
  61          * @var string $mContent
  62          */
  63         var $mContent;                    // !< #BC cruft
  64
  65         /**
  66          * Content of the revision we are working on
  67          * @var Content
  68          * @since 1.21
  69          */
  70         var $mContentObject;              // !<
  71
  72         /**
  73          * Is the content ($mContent) already loaded?
  74          * @var bool $mContentLoaded
  75          */
  76         var $mContentLoaded = false;      // !<
  77
  78         /**
  79          * The oldid of the article that is to be shown, 0 for the
  80          * current revision
  81          * @var int|null $mOldId
  82          */
  83         var $mOldId;                      // !<
  84
  85         /**
  86          * Title from which we were redirected here
  87          * @var Title $mRedirectedFrom
  88          */
  89         var $mRedirectedFrom = null;
  90
  91         /**
  92          * URL to redirect to or false if none
  93          * @var string|false $mRedirectUrl
  94          */
  95         var $mRedirectUrl = false;        // !<
  96
  97         /**
  98          * Revision ID of revision we are working on
  99          * @var int $mRevIdFetched
 100          */
 101         var $mRevIdFetched = 0;           // !<
 102
 103         /**
 104          * Revision we are working on
 105          * @var Revision $mRevision
 106          */
 107         var $mRevision = null;
 108
 109         /**
 110          * ParserOutput object
 111          * @var ParserOutput $mParserOutput
 112          */
 113         var $mParserOutput;
 114
 115         /**@}}*/
 116
 117         /**
 118          * Constructor and clear the article
 119          * @param $title Title Reference to a Title object.
 120          * @param $oldId Integer revision ID, null to fetch from request, zero for current
 121          */
 122         public function __construct( Title $title, $oldId = null ) {
 123                 $this->mOldId = $oldId;
 124                 $this->mPage = $this->newPage( $title );
 125         }
 126
 127         /**
 128          * @param $title Title
 129          * @return WikiPage
 130          */
 131         protected function newPage( Title $title ) {
 132                 return new WikiPage( $title );
 133         }
 134
 135         /**
 136          * Constructor from a page id
 137          * @param int $id article ID to load
 138          * @return Article|null
 139          */
 140         public static function newFromID( $id ) {
 141                 $t = Title::newFromID( $id );
 142                 # @todo FIXME: Doesn't inherit right
 143                 return $t == null ? null : new self( $t );
 144                 # return $t == null ? null : new static( $t ); // PHP 5.3
 145         }
 146
 147         /**
 148          * Create an Article object of the appropriate class for the given page.
 149          *
 150          * @param $title Title
 151          * @param $context IContextSource
 152          * @return Article object
 153          */
 154         public static function newFromTitle( $title, IContextSource $context ) {
 155                 if ( NS_MEDIA == $title->getNamespace() ) {
 156                         // FIXME: where should this go?
 157                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 158                 }
 159
 160                 $page = null;
 161                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 162                 if ( !$page ) {
 163                         switch ( $title->getNamespace() ) {
 164                                 case NS_FILE:
 165                                         $page = new ImagePage( $title );
 166                                         break;
 167                                 case NS_CATEGORY:
 168                                         $page = new CategoryPage( $title );
 169                                         break;
 170                                 default:
 171                                         $page = new Article( $title );
 172                         }
 173                 }
 174                 $page->setContext( $context );
 175
 176                 return $page;
 177         }
 178
 179         /**
 180          * Create an Article object of the appropriate class for the given page.
 181          *
 182          * @param $page WikiPage
 183          * @param $context IContextSource
 184          * @return Article object
 185          */
 186         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 187                 $article = self::newFromTitle( $page->getTitle(), $context );
 188                 $article->mPage = $page; // override to keep process cached vars
 189                 return $article;
 190         }
 191
 192         /**
 193          * Tell the page view functions that this view was redirected
 194          * from another page on the wiki.
 195          * @param $from Title object.
 196          */
 197         public function setRedirectedFrom( Title $from ) {
 198                 $this->mRedirectedFrom = $from;
 199         }
 200
 201         /**
 202          * Get the title object of the article
 203          *
 204          * @return Title object of this page
 205          */
 206         public function getTitle() {
 207                 return $this->mPage->getTitle();
 208         }
 209
 210         /**
 211          * Get the WikiPage object of this instance
 212          *
 213          * @since 1.19
 214          * @return WikiPage
 215          */
 216         public function getPage() {
 217                 return $this->mPage;
 218         }
 219
 220         /**
 221          * Clear the object
 222          */
 223         public function clear() {
 224                 $this->mContentLoaded = false;
 225
 226                 $this->mRedirectedFrom = null; # Title object if set
 227                 $this->mRevIdFetched = 0;
 228                 $this->mRedirectUrl = false;
 229
 230                 $this->mPage->clear();
 231         }
 232
 233         /**
 234          * Note that getContent/loadContent do not follow redirects anymore.
 235          * If you need to fetch redirectable content easily, try
 236          * the shortcut in WikiPage::getRedirectTarget()
 237          *
 238          * This function has side effects! Do not use this function if you
 239          * only want the real revision text if any.
 240          *
 241          * @deprecated in 1.21; use WikiPage::getContent() instead
 242          *
 243          * @return string Return the text of this revision
 244          */
 245         public function getContent() {
 246                 ContentHandler::deprecated( __METHOD__, '1.21' );
 247                 $content = $this->getContentObject();
 248                 return ContentHandler::getContentText( $content );
 249         }
 250
 251         /**
 252          * Returns a Content object representing the pages effective display content,
 253          * not necessarily the revision's content!
 254          *
 255          * Note that getContent/loadContent do not follow redirects anymore.
 256          * If you need to fetch redirectable content easily, try
 257          * the shortcut in WikiPage::getRedirectTarget()
 258          *
 259          * This function has side effects! Do not use this function if you
 260          * only want the real revision text if any.
 261          *
 262          * @return Content Return the content of this revision
 263          *
 264          * @since 1.21
 265          */
 266         protected function getContentObject() {
 267                 wfProfileIn( __METHOD__ );
 268
 269                 if ( $this->mPage->getID() === 0 ) {
 270                         # If this is a MediaWiki:x message, then load the messages
 271                         # and return the message value for x.
 272                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 273                                 $text = $this->getTitle()->getDefaultMessageText();
 274                                 if ( $text === false ) {
 275                                         $text = '';
 276                                 }
 277
 278                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 279                         } else {
 280                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 281                                 $content = new MessageContent( $message, null, 'parsemag' );
 282                         }
 283                 } else {
 284                         $this->fetchContentObject();
 285                         $content = $this->mContentObject;
 286                 }
 287
 288                 wfProfileOut( __METHOD__ );
 289                 return $content;
 290         }
 291
 292         /**
 293          * @return int The oldid of the article that is to be shown, 0 for the
 294          *             current revision
 295          */
 296         public function getOldID() {
 297                 if ( is_null( $this->mOldId ) ) {
 298                         $this->mOldId = $this->getOldIDFromRequest();
 299                 }
 300
 301                 return $this->mOldId;
 302         }
 303
 304         /**
 305          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 306          *
 307          * @return int The old id for the request
 308          */
 309         public function getOldIDFromRequest() {
 310                 $this->mRedirectUrl = false;
 311
 312                 $request = $this->getContext()->getRequest();
 313                 $oldid = $request->getIntOrNull( 'oldid' );
 314
 315                 if ( $oldid === null ) {
 316                         return 0;
 317                 }
 318
 319                 if ( $oldid !== 0 ) {
 320                         # Load the given revision and check whether the page is another one.
 321                         # In that case, update this instance to reflect the change.
 322                         if ( $oldid === $this->mPage->getLatest() ) {
 323                                 $this->mRevision = $this->mPage->getRevision();
 324                         } else {
 325                                 $this->mRevision = Revision::newFromId( $oldid );
 326                                 if ( $this->mRevision !== null ) {
 327                                         // Revision title doesn't match the page title given?
 328                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 329                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 330                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 331                                         }
 332                                 }
 333                         }
 334                 }
 335
 336                 if ( $request->getVal( 'direction' ) == 'next' ) {
 337                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 338                         if ( $nextid ) {
 339                                 $oldid = $nextid;
 340                                 $this->mRevision = null;
 341                         } else {
 342                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 343                         }
 344                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 345                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 346                         if ( $previd ) {
 347                                 $oldid = $previd;
 348                                 $this->mRevision = null;
 349                         }
 350                 }
 351
 352                 return $oldid;
 353         }
 354
 355         /**
 356          * Load the revision (including text) into this object
 357          *
 358          * @deprecated in 1.19; use fetchContent()
 359          */
 360         function loadContent() {
 361                 wfDeprecated( __METHOD__, '1.19' );
 362                 $this->fetchContent();
 363         }
 364
 365         /**
 366          * Get text of an article from database
 367          * Does *NOT* follow redirects.
 368          *
 369          * @protected
 370          * @note this is really internal functionality that should really NOT be used by other functions. For accessing
 371          *       article content, use the WikiPage class, especially WikiBase::getContent(). However, a lot of legacy code
 372          *       uses this method to retrieve page text from the database, so the function has to remain public for now.
 373          *
 374          * @return mixed string containing article contents, or false if null
 375          * @deprecated in 1.21, use WikiPage::getContent() instead
 376          */
 377         function fetchContent() { #BC cruft!
 378                 ContentHandler::deprecated( __METHOD__, '1.21' );
 379
 380                 if ( $this->mContentLoaded && $this->mContent ) {
 381                         return $this->mContent;
 382                 }
 383
 384                 wfProfileIn( __METHOD__ );
 385
 386                 $content = $this->fetchContentObject();
 387
 388                 // @todo Get rid of mContent everywhere!
 389                 $this->mContent = ContentHandler::getContentText( $content );
 390                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 391
 392                 wfProfileOut( __METHOD__ );
 393
 394                 return $this->mContent;
 395         }
 396
 397         /**
 398          * Get text content object
 399          * Does *NOT* follow redirects.
 400          * TODO: when is this null?
 401          *
 402          * @note code that wants to retrieve page content from the database should use WikiPage::getContent().
 403          *
 404          * @return Content|null|boolean false
 405          *
 406          * @since 1.21
 407          */
 408         protected function fetchContentObject() {
 409                 if ( $this->mContentLoaded ) {
 410                         return $this->mContentObject;
 411                 }
 412
 413                 wfProfileIn( __METHOD__ );
 414
 415                 $this->mContentLoaded = true;
 416                 $this->mContent = null;
 417
 418                 $oldid = $this->getOldID();
 419
 420                 # Pre-fill content with error message so that if something
 421                 # fails we'll have something telling us what we intended.
 422                 //XXX: this isn't page content but a UI message. horrible.
 423                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 424
 425                 if ( $oldid ) {
 426                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 427                         if ( !$this->mRevision ) {
 428                                 $this->mRevision = Revision::newFromId( $oldid );
 429                                 if ( !$this->mRevision ) {
 430                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 431                                         wfProfileOut( __METHOD__ );
 432                                         return false;
 433                                 }
 434                         }
 435                 } else {
 436                         if ( !$this->mPage->getLatest() ) {
 437                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 438                                 wfProfileOut( __METHOD__ );
 439                                 return false;
 440                         }
 441
 442                         $this->mRevision = $this->mPage->getRevision();
 443
 444                         if ( !$this->mRevision ) {
 445                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 446                                 wfProfileOut( __METHOD__ );
 447                                 return false;
 448                         }
 449                 }
 450
 451                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 452                 // We should instead work with the Revision object when we need it...
 453                 $this->mContentObject = $this->mRevision->getContent( Revision::FOR_THIS_USER, $this->getContext()->getUser() ); // Loads if user is allowed
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455
 456                 wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 457
 458                 wfProfileOut( __METHOD__ );
 459
 460                 return $this->mContentObject;
 461         }
 462
 463         /**
 464          * No-op
 465          * @deprecated since 1.18
 466          */
 467         public function forUpdate() {
 468                 wfDeprecated( __METHOD__, '1.18' );
 469         }
 470
 471         /**
 472          * Returns true if the currently-referenced revision is the current edit
 473          * to this page (and it exists).
 474          * @return bool
 475          */
 476         public function isCurrent() {
 477                 # If no oldid, this is the current version.
 478                 if ( $this->getOldID() == 0 ) {
 479                         return true;
 480                 }
 481
 482                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 483         }
 484
 485         /**
 486          * Get the fetched Revision object depending on request parameters or null
 487          * on failure.
 488          *
 489          * @since 1.19
 490          * @return Revision|null
 491          */
 492         public function getRevisionFetched() {
 493                 $this->fetchContentObject();
 494
 495                 return $this->mRevision;
 496         }
 497
 498         /**
 499          * Use this to fetch the rev ID used on page views
 500          *
 501          * @return int revision ID of last article revision
 502          */
 503         public function getRevIdFetched() {
 504                 if ( $this->mRevIdFetched ) {
 505                         return $this->mRevIdFetched;
 506                 } else {
 507                         return $this->mPage->getLatest();
 508                 }
 509         }
 510
 511         /**
 512          * This is the default action of the index.php entry point: just view the
 513          * page of the given title.
 514          */
 515         public function view() {
 516                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 517
 518                 wfProfileIn( __METHOD__ );
 519
 520                 # Get variables from query string
 521                 # As side effect this will load the revision and update the title
 522                 # in a revision ID is passed in the request, so this should remain
 523                 # the first call of this method even if $oldid is used way below.
 524                 $oldid = $this->getOldID();
 525
 526                 $user = $this->getContext()->getUser();
 527                 # Another whitelist check in case getOldID() is altering the title
 528                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 529                 if ( count( $permErrors ) ) {
 530                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 531                         wfProfileOut( __METHOD__ );
 532                         throw new PermissionsError( 'read', $permErrors );
 533                 }
 534
 535                 $outputPage = $this->getContext()->getOutput();
 536                 # getOldID() may as well want us to redirect somewhere else
 537                 if ( $this->mRedirectUrl ) {
 538                         $outputPage->redirect( $this->mRedirectUrl );
 539                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 540                         wfProfileOut( __METHOD__ );
 541
 542                         return;
 543                 }
 544
 545                 # If we got diff in the query, we want to see a diff page instead of the article.
 546                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 547                         wfDebug( __METHOD__ . ": showing diff page\n" );
 548                         $this->showDiffPage();
 549                         wfProfileOut( __METHOD__ );
 550
 551                         return;
 552                 }
 553
 554                 # Set page title (may be overridden by DISPLAYTITLE)
 555                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 556
 557                 $outputPage->setArticleFlag( true );
 558                 # Allow frames by default
 559                 $outputPage->allowClickjacking();
 560
 561                 $parserCache = ParserCache::singleton();
 562
 563                 $parserOptions = $this->getParserOptions();
 564                 # Render printable version, use printable version cache
 565                 if ( $outputPage->isPrintable() ) {
 566                         $parserOptions->setIsPrintable( true );
 567                         $parserOptions->setEditSection( false );
 568                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 569                         $parserOptions->setEditSection( false );
 570                 }
 571
 572                 # Try client and file cache
 573                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 574                         if ( $wgUseETag ) {
 575                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 576                         }
 577
 578                         # Is it client cached?
 579                         if ( $outputPage->checkLastModified( $this->mPage->getTouched() ) ) {
 580                                 wfDebug( __METHOD__ . ": done 304\n" );
 581                                 wfProfileOut( __METHOD__ );
 582
 583                                 return;
 584                         # Try file cache
 585                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 586                                 wfDebug( __METHOD__ . ": done file cache\n" );
 587                                 # tell wgOut that output is taken care of
 588                                 $outputPage->disable();
 589                                 $this->mPage->doViewUpdates( $user, $oldid );
 590                                 wfProfileOut( __METHOD__ );
 591
 592                                 return;
 593                         }
 594                 }
 595
 596                 # Should the parser cache be used?
 597                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 598                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 599                 if ( $user->getStubThreshold() ) {
 600                         wfIncrStats( 'pcache_miss_stub' );
 601                 }
 602
 603                 $this->showRedirectedFromHeader();
 604                 $this->showNamespaceHeader();
 605
 606                 # Iterate through the possible ways of constructing the output text.
 607                 # Keep going until $outputDone is set, or we run out of things to do.
 608                 $pass = 0;
 609                 $outputDone = false;
 610                 $this->mParserOutput = false;
 611
 612                 while ( !$outputDone && ++$pass ) {
 613                         switch ( $pass ) {
 614                                 case 1:
 615                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 616                                         break;
 617                                 case 2:
 618                                         # Early abort if the page doesn't exist
 619                                         if ( !$this->mPage->exists() ) {
 620                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 621                                                 $this->showMissingArticle();
 622                                                 wfProfileOut( __METHOD__ );
 623                                                 return;
 624                                         }
 625
 626                                         # Try the parser cache
 627                                         if ( $useParserCache ) {
 628                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 629
 630                                                 if ( $this->mParserOutput !== false ) {
 631                                                         if ( $oldid ) {
 632                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 633                                                                 $this->setOldSubtitle( $oldid );
 634                                                         } else {
 635                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 636                                                         }
 637                                                         $outputPage->addParserOutput( $this->mParserOutput );
 638                                                         # Ensure that UI elements requiring revision ID have
 639                                                         # the correct version information.
 640                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 641                                                         # Preload timestamp to avoid a DB hit
 642                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 643                                                         if ( $cachedTimestamp !== null ) {
 644                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 645                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 646                                                         }
 647                                                         $outputDone = true;
 648                                                 }
 649                                         }
 650                                         break;
 651                                 case 3:
 652                                         # This will set $this->mRevision if needed
 653                                         $this->fetchContentObject();
 654
 655                                         # Are we looking at an old revision
 656                                         if ( $oldid && $this->mRevision ) {
 657                                                 $this->setOldSubtitle( $oldid );
 658
 659                                                 if ( !$this->showDeletedRevisionHeader() ) {
 660                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 661                                                         wfProfileOut( __METHOD__ );
 662                                                         return;
 663                                                 }
 664                                         }
 665
 666                                         # Ensure that UI elements requiring revision ID have
 667                                         # the correct version information.
 668                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 669                                         # Preload timestamp to avoid a DB hit
 670                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 671
 672                                         # Pages containing custom CSS or JavaScript get special treatment
 673                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 674                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 675                                                 $this->showCssOrJsPage();
 676                                                 $outputDone = true;
 677                                         } elseif ( !wfRunHooks( 'ArticleContentViewCustom',
 678                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 679
 680                                                 # Allow extensions do their own custom view for certain pages
 681                                                 $outputDone = true;
 682                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 683                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 684
 685                                                 # Allow extensions do their own custom view for certain pages
 686                                                 $outputDone = true;
 687                                         }
 688                                         break;
 689                                 case 4:
 690                                         # Run the parse, protected by a pool counter
 691                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 692
 693                                         $content = $this->getContentObject();
 694                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 695                                                 $this->getRevIdFetched(), $useParserCache, $content );
 696
 697                                         if ( !$poolArticleView->execute() ) {
 698                                                 $error = $poolArticleView->getError();
 699                                                 if ( $error ) {
 700                                                         $outputPage->clearHTML(); // for release() errors
 701                                                         $outputPage->enableClientCache( false );
 702                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 703
 704                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 705                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 706                                                 }
 707                                                 # Connection or timeout error
 708                                                 wfProfileOut( __METHOD__ );
 709                                                 return;
 710                                         }
 711
 712                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 713                                         $outputPage->addParserOutput( $this->mParserOutput );
 714                                         if ( $content->getRedirectTarget() ) {
 715                                                 $outputPage->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
 716                                         }
 717
 718                                         # Don't cache a dirty ParserOutput object
 719                                         if ( $poolArticleView->getIsDirty() ) {
 720                                                 $outputPage->setSquidMaxage( 0 );
 721                                                 $outputPage->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
 722                                         }
 723
 724                                         $outputDone = true;
 725                                         break;
 726                                 # Should be unreachable, but just in case...
 727                                 default:
 728                                         break 2;
 729                         }
 730                 }
 731
 732                 # Get the ParserOutput actually *displayed* here.
 733                 # Note that $this->mParserOutput is the *current* version output.
 734                 $pOutput = ( $outputDone instanceof ParserOutput )
 735                         ? $outputDone // object fetched by hook
 736                         : $this->mParserOutput;
 737
 738                 # Adjust title for main page & pages with displaytitle
 739                 if ( $pOutput ) {
 740                         $this->adjustDisplayTitle( $pOutput );
 741                 }
 742
 743                 # For the main page, overwrite the <title> element with the con-
 744                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 745                 # that's not empty).
 746                 # This message always exists because it is in the i18n files
 747                 if ( $this->getTitle()->isMainPage() ) {
 748                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 749                         if ( !$msg->isDisabled() ) {
 750                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 751                         }
 752                 }
 753
 754                 # Check for any __NOINDEX__ tags on the page using $pOutput
 755                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 756                 $outputPage->setIndexPolicy( $policy['index'] );
 757                 $outputPage->setFollowPolicy( $policy['follow'] );
 758
 759                 $this->showViewFooter();
 760                 $this->mPage->doViewUpdates( $user, $oldid );
 761
 762                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 763
 764                 wfProfileOut( __METHOD__ );
 765         }
 766
 767         /**
 768          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 769          * @param $pOutput ParserOutput
 770          */
 771         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 772                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 773                 $titleText = $pOutput->getTitleText();
 774                 if ( strval( $titleText ) !== '' ) {
 775                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 776                 }
 777         }
 778
 779         /**
 780          * Show a diff page according to current request variables. For use within
 781          * Article::view() only, other callers should use the DifferenceEngine class.
 782          *
 783          * @todo Make protected
 784          */
 785         public function showDiffPage() {
 786                 $request = $this->getContext()->getRequest();
 787                 $user = $this->getContext()->getUser();
 788                 $diff = $request->getVal( 'diff' );
 789                 $rcid = $request->getVal( 'rcid' );
 790                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 791                 $purge = $request->getVal( 'action' ) == 'purge';
 792                 $unhide = $request->getInt( 'unhide' ) == 1;
 793                 $oldid = $this->getOldID();
 794
 795                 $rev = $this->getRevisionFetched();
 796
 797                 if ( !$rev ) {
 798                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 799                         $this->getContext()->getOutput()->addWikiMsg( 'difference-missing-revision', $oldid, 1 );
 800                         return;
 801                 }
 802
 803                 $contentHandler = $rev->getContentHandler();
 804                 $de = $contentHandler->createDifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 805
 806                 // DifferenceEngine directly fetched the revision:
 807                 $this->mRevIdFetched = $de->mNewid;
 808                 $de->showDiffPage( $diffOnly );
 809
 810                 // Run view updates for the newer revision being diffed (and shown below the diff if not $diffOnly)
 811                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 812                 // New can be false, convert it to 0 - this conveniently means the latest revision
 813                 $this->mPage->doViewUpdates( $user, (int)$new );
 814         }
 815
 816         /**
 817          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 818          * Article::view() only.
 819          *
 820          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 821          * page views.
 822          *
 823          * @param bool $showCacheHint whether to show a message telling the user to clear the browser cache (default: true).
 824          */
 825         protected function showCssOrJsPage( $showCacheHint = true ) {
 826                 $outputPage = $this->getContext()->getOutput();
 827
 828                 if ( $showCacheHint ) {
 829                         $dir = $this->getContext()->getLanguage()->getDir();
 830                         $lang = $this->getContext()->getLanguage()->getCode();
 831
 832                         $outputPage->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 833                                 'clearyourcache' );
 834                 }
 835
 836                 $this->fetchContentObject();
 837
 838                 if ( $this->mContentObject ) {
 839                         // Give hooks a chance to customise the output
 840                         if ( ContentHandler::runLegacyHooks( 'ShowRawCssJs', array( $this->mContentObject, $this->getTitle(), $outputPage ) ) ) {
 841                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 842                                 $outputPage->addHTML( $po->getText() );
 843                         }
 844                 }
 845         }
 846
 847         /**
 848          * Get the robot policy to be used for the current view
 849          * @param string $action the action= GET parameter
 850          * @param $pOutput ParserOutput|null
 851          * @return Array the policy that should be set
 852          * TODO: actions other than 'view'
 853          */
 854         public function getRobotPolicy( $action, $pOutput = null ) {
 855                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 856
 857                 $ns = $this->getTitle()->getNamespace();
 858
 859                 # Don't index user and user talk pages for blocked users (bug 11443)
 860                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 861                         $specificTarget = null;
 862                         $vagueTarget = null;
 863                         $titleText = $this->getTitle()->getText();
 864                         if ( IP::isValid( $titleText ) ) {
 865                                 $vagueTarget = $titleText;
 866                         } else {
 867                                 $specificTarget = $titleText;
 868                         }
 869                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 870                                 return array(
 871                                         'index' => 'noindex',
 872                                         'follow' => 'nofollow'
 873                                 );
 874                         }
 875                 }
 876
 877                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 878                         # Non-articles (special pages etc), and old revisions
 879                         return array(
 880                                 'index' => 'noindex',
 881                                 'follow' => 'nofollow'
 882                         );
 883                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 884                         # Discourage indexing of printable versions, but encourage following
 885                         return array(
 886                                 'index' => 'noindex',
 887                                 'follow' => 'follow'
 888                         );
 889                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 890                         # For ?curid=x urls, disallow indexing
 891                         return array(
 892                                 'index' => 'noindex',
 893                                 'follow' => 'follow'
 894                         );
 895                 }
 896
 897                 # Otherwise, construct the policy based on the various config variables.
 898                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 899
 900                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 901                         # Honour customised robot policies for this namespace
 902                         $policy = array_merge(
 903                                 $policy,
 904                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 905                         );
 906                 }
 907                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 908                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 909                         # a final sanity check that we have really got the parser output.
 910                         $policy = array_merge(
 911                                 $policy,
 912                                 array( 'index' => $pOutput->getIndexPolicy() )
 913                         );
 914                 }
 915
 916                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 917                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 918                         $policy = array_merge(
 919                                 $policy,
 920                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 921                         );
 922                 }
 923
 924                 return $policy;
 925         }
 926
 927         /**
 928          * Converts a String robot policy into an associative array, to allow
 929          * merging of several policies using array_merge().
 930          * @param $policy Mixed, returns empty array on null/false/'', transparent
 931          *            to already-converted arrays, converts String.
 932          * @return Array: 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 933          */
 934         public static function formatRobotPolicy( $policy ) {
 935                 if ( is_array( $policy ) ) {
 936                         return $policy;
 937                 } elseif ( !$policy ) {
 938                         return array();
 939                 }
 940
 941                 $policy = explode( ',', $policy );
 942                 $policy = array_map( 'trim', $policy );
 943
 944                 $arr = array();
 945                 foreach ( $policy as $var ) {
 946                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 947                                 $arr['index'] = $var;
 948                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 949                                 $arr['follow'] = $var;
 950                         }
 951                 }
 952
 953                 return $arr;
 954         }
 955
 956         /**
 957          * If this request is a redirect view, send "redirected from" subtitle to
 958          * the output. Returns true if the header was needed, false if this is not
 959          * a redirect view. Handles both local and remote redirects.
 960          *
 961          * @return boolean
 962          */
 963         public function showRedirectedFromHeader() {
 964                 global $wgRedirectSources;
 965                 $outputPage = $this->getContext()->getOutput();
 966
 967                 $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 968
 969                 if ( isset( $this->mRedirectedFrom ) ) {
 970                         // This is an internally redirected page view.
 971                         // We'll need a backlink to the source page for navigation.
 972                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 973                                 $redir = Linker::linkKnown(
 974                                         $this->mRedirectedFrom,
 975                                         null,
 976                                         array(),
 977                                         array( 'redirect' => 'no' )
 978                                 );
 979
 980                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 981
 982                                 // Set the fragment if one was specified in the redirect
 983                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 984                                         $outputPage->addJsConfigVars( 'wgRedirectToFragment', $this->getTitle()->getFragmentForURL() );
 985                                         $outputPage->addModules( 'mediawiki.action.view.redirectToFragment' );
 986                                 }
 987
 988                                 // Add a <link rel="canonical"> tag
 989                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 990
 991                                 // Tell the output object that the user arrived at this article through a redirect
 992                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 993
 994                                 return true;
 995                         }
 996                 } elseif ( $rdfrom ) {
 997                         // This is an externally redirected view, from some other wiki.
 998                         // If it was reported from a trusted site, supply a backlink.
 999                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1000                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1001                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
1002
1003                                 return true;
1004                         }
1005                 }
1006
1007                 return false;
1008         }
1009
1010         /**
1011          * Show a header specific to the namespace currently being viewed, like
1012          * [[MediaWiki:Talkpagetext]]. For Article::view().
1013          */
1014         public function showNamespaceHeader() {
1015                 if ( $this->getTitle()->isTalkPage() ) {
1016                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1017                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1018                         }
1019                 }
1020         }
1021
1022         /**
1023          * Show the footer section of an ordinary page view
1024          */
1025         public function showViewFooter() {
1026                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1027                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
1028                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1029                 }
1030
1031                 // Show a footer allowing the user to patrol the shown revision or page if possible
1032                 $patrolFooterShown = $this->showPatrolFooter();
1033
1034                 wfRunHooks( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1035
1036         }
1037
1038         /**
1039          * If patrol is possible, output a patrol UI box. This is called from the
1040          * footer section of ordinary page views. If patrol is not possible or not
1041          * desired, does nothing.
1042          * Side effect: When the patrol link is build, this method will call
1043          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1044          *
1045          * @return bool
1046          */
1047         public function showPatrolFooter() {
1048                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1049
1050                 $outputPage = $this->getContext()->getOutput();
1051                 $user = $this->getContext()->getUser();
1052                 $cache = wfGetMainCache();
1053                 $rc = false;
1054
1055                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user ) || !( $wgUseRCPatrol || $wgUseNPPatrol ) ) {
1056                         // Patrolling is disabled or the user isn't allowed to
1057                         return false;
1058                 }
1059
1060                 wfProfileIn( __METHOD__ );
1061
1062                 // New page patrol: Get the timestamp of the oldest revison which
1063                 // the revision table holds for the given page. Then we look
1064                 // whether it's within the RC lifespan and if it is, we try
1065                 // to get the recentchanges row belonging to that entry
1066                 // (with rc_new = 1).
1067
1068                 // Check for cached results
1069                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1070                         wfProfileOut( __METHOD__ );
1071                         return false;
1072                 }
1073
1074                 if ( $this->mRevision && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 ) ) {
1075                         // The current revision is already older than what could be in the RC table
1076                         // 6h tolerance because the RC might not be cleaned out regularly
1077                         wfProfileOut( __METHOD__ );
1078                         return false;
1079                 }
1080
1081                 $dbr = wfGetDB( DB_SLAVE );
1082                 $oldestRevisionTimestamp = $dbr->selectField(
1083                         'revision',
1084                         'MIN( rev_timestamp )',
1085                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1086                         __METHOD__
1087                 );
1088
1089                 if ( $oldestRevisionTimestamp && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 ) ) {
1090                         // 6h tolerance because the RC might not be cleaned out regularly
1091                         $rc = RecentChange::newFromConds(
1092                                 array(
1093                                         'rc_new' => 1,
1094                                         'rc_timestamp' => $oldestRevisionTimestamp,
1095                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1096                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1097                                         'rc_patrolled' => 0
1098                                 ),
1099                                 __METHOD__,
1100                                 array( 'USE INDEX' => 'new_name_timestamp' )
1101                         );
1102                 }
1103
1104                 if ( !$rc ) {
1105                         // No RC entry around
1106
1107                         // Cache the information we gathered above in case we can't patrol
1108                         // Don't cache in case we can patrol as this could change
1109                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1110
1111                         wfProfileOut( __METHOD__ );
1112                         return false;
1113                 }
1114
1115                 if ( $rc->getPerformer()->getName() == $user->getName() ) {
1116                         // Don't show a patrol link for own creations. If the user could
1117                         // patrol them, they already would be patrolled
1118                         wfProfileOut( __METHOD__ );
1119                         return false;
1120                 }
1121
1122                 $rcid = $rc->getAttribute( 'rc_id' );
1123
1124                 $token = $user->getEditToken( $rcid );
1125
1126                 $outputPage->preventClickjacking();
1127                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1128                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1129                 }
1130
1131                 $link = Linker::linkKnown(
1132                         $this->getTitle(),
1133                         wfMessage( 'markaspatrolledtext' )->escaped(),
1134                         array(),
1135                         array(
1136                                 'action' => 'markpatrolled',
1137                                 'rcid' => $rcid,
1138                                 'token' => $token,
1139                         )
1140                 );
1141
1142                 $outputPage->addHTML(
1143                         "<div class='patrollink'>" .
1144                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1145                         '</div>'
1146                 );
1147
1148                 wfProfileOut( __METHOD__ );
1149                 return true;
1150         }
1151
1152         /**
1153          * Show the error text for a missing article. For articles in the MediaWiki
1154          * namespace, show the default message text. To be called from Article::view().
1155          */
1156         public function showMissingArticle() {
1157                 global $wgSend404Code;
1158                 $outputPage = $this->getContext()->getOutput();
1159                 // Whether the page is a root user page of an existing user (but not a subpage)
1160                 $validUserPage = false;
1161
1162                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1163                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
1164                         $parts = explode( '/', $this->getTitle()->getText() );
1165                         $rootPart = $parts[0];
1166                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1167                         $ip = User::isIP( $rootPart );
1168
1169                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1170                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1171                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1172                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1173                                 LogEventsList::showLogExtract(
1174                                         $outputPage,
1175                                         'block',
1176                                         $user->getUserPage(),
1177                                         '',
1178                                         array(
1179                                                 'lim' => 1,
1180                                                 'showIfEmpty' => false,
1181                                                 'msgKey' => array(
1182                                                         'blocked-notice-logextract',
1183                                                         $user->getName() # Support GENDER in notice
1184                                                 )
1185                                         )
1186                                 );
1187                                 $validUserPage = !$this->getTitle()->isSubpage();
1188                         } else {
1189                                 $validUserPage = !$this->getTitle()->isSubpage();
1190                         }
1191                 }
1192
1193                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1194
1195                 // Give extensions a chance to hide their (unrelated) log entries
1196                 $logTypes = array( 'delete', 'move' );
1197                 $conds = array( "log_action != 'revision'" );
1198                 wfRunHooks( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1199
1200                 # Show delete and move logs
1201                 LogEventsList::showLogExtract( $outputPage, $logTypes, $this->getTitle(), '',
1202                         array( 'lim' => 10,
1203                                 'conds' => $conds,
1204                                 'showIfEmpty' => false,
1205                                 'msgKey' => array( 'moveddeleted-notice' ) )
1206                 );
1207
1208                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1209                         // If there's no backing content, send a 404 Not Found
1210                         // for better machine handling of broken links.
1211                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1212                 }
1213
1214                 if ( $validUserPage ) {
1215                         // Also apply the robot policy for nonexisting user pages (as those aren't served as 404)
1216                         $policy = $this->getRobotPolicy( 'view' );
1217                         $outputPage->setIndexPolicy( $policy['index'] );
1218                         $outputPage->setFollowPolicy( $policy['follow'] );
1219                 }
1220
1221                 $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
1222
1223                 if ( ! $hookResult ) {
1224                         return;
1225                 }
1226
1227                 # Show error message
1228                 $oldid = $this->getOldID();
1229                 if ( $oldid ) {
1230                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1231                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
1232                         // Use the default message text
1233                         $text = $this->getTitle()->getDefaultMessageText();
1234                 } elseif ( $this->getTitle()->quickUserCan( 'create', $this->getContext()->getUser() )
1235                         && $this->getTitle()->quickUserCan( 'edit', $this->getContext()->getUser() )
1236                 ) {
1237                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1238                         $text = wfMessage( $message )->plain();
1239                 } else {
1240                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1241                 }
1242                 $text = "<div class='noarticletext'>\n$text\n</div>";
1243
1244                 $outputPage->addWikiText( $text );
1245         }
1246
1247         /**
1248          * If the revision requested for view is deleted, check permissions.
1249          * Send either an error message or a warning header to the output.
1250          *
1251          * @return boolean true if the view is allowed, false if not.
1252          */
1253         public function showDeletedRevisionHeader() {
1254                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1255                         // Not deleted
1256                         return true;
1257                 }
1258
1259                 $outputPage = $this->getContext()->getOutput();
1260                 $user = $this->getContext()->getUser();
1261                 // If the user is not allowed to see it...
1262                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1263                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1264                                 'rev-deleted-text-permission' );
1265
1266                         return false;
1267                 // If the user needs to confirm that they want to see it...
1268                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1269                         # Give explanation and add a link to view the revision...
1270                         $oldid = intval( $this->getOldID() );
1271                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1272                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1273                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1274                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1275                                 array( $msg, $link ) );
1276
1277                         return false;
1278                 // We are allowed to see...
1279                 } else {
1280                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1281                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1282                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1283
1284                         return true;
1285                 }
1286         }
1287
1288         /**
1289          * Generate the navigation links when browsing through an article revisions
1290          * It shows the information as:
1291          *   Revision as of \<date\>; view current revision
1292          *   \<- Previous version | Next Version -\>
1293          *
1294          * @param int $oldid revision ID of this article revision
1295          */
1296         public function setOldSubtitle( $oldid = 0 ) {
1297                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1298                         return;
1299                 }
1300
1301                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1302
1303                 # Cascade unhide param in links for easy deletion browsing
1304                 $extraParams = array();
1305                 if ( $unhide ) {
1306                         $extraParams['unhide'] = 1;
1307                 }
1308
1309                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1310                         $revision = $this->mRevision;
1311                 } else {
1312                         $revision = Revision::newFromId( $oldid );
1313                 }
1314
1315                 $timestamp = $revision->getTimestamp();
1316
1317                 $current = ( $oldid == $this->mPage->getLatest() );
1318                 $language = $this->getContext()->getLanguage();
1319                 $user = $this->getContext()->getUser();
1320
1321                 $td = $language->userTimeAndDate( $timestamp, $user );
1322                 $tddate = $language->userDate( $timestamp, $user );
1323                 $tdtime = $language->userTime( $timestamp, $user );
1324
1325                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1326                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1327
1328                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1329                         ? 'revision-info-current'
1330                         : 'revision-info';
1331
1332                 $outputPage = $this->getContext()->getOutput();
1333                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1334                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1335                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1336
1337                 $lnk = $current
1338                         ? wfMessage( 'currentrevisionlink' )->escaped()
1339                         : Linker::linkKnown(
1340                                 $this->getTitle(),
1341                                 wfMessage( 'currentrevisionlink' )->escaped(),
1342                                 array(),
1343                                 $extraParams
1344                         );
1345                 $curdiff = $current
1346                         ? wfMessage( 'diff' )->escaped()
1347                         : Linker::linkKnown(
1348                                 $this->getTitle(),
1349                                 wfMessage( 'diff' )->escaped(),
1350                                 array(),
1351                                 array(
1352                                         'diff' => 'cur',
1353                                         'oldid' => $oldid
1354                                 ) + $extraParams
1355                         );
1356                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1357                 $prevlink = $prev
1358                         ? Linker::linkKnown(
1359                                 $this->getTitle(),
1360                                 wfMessage( 'previousrevision' )->escaped(),
1361                                 array(),
1362                                 array(
1363                                         'direction' => 'prev',
1364                                         'oldid' => $oldid
1365                                 ) + $extraParams
1366                         )
1367                         : wfMessage( 'previousrevision' )->escaped();
1368                 $prevdiff = $prev
1369                         ? Linker::linkKnown(
1370                                 $this->getTitle(),
1371                                 wfMessage( 'diff' )->escaped(),
1372                                 array(),
1373                                 array(
1374                                         'diff' => 'prev',
1375                                         'oldid' => $oldid
1376                                 ) + $extraParams
1377                         )
1378                         : wfMessage( 'diff' )->escaped();
1379                 $nextlink = $current
1380                         ? wfMessage( 'nextrevision' )->escaped()
1381                         : Linker::linkKnown(
1382                                 $this->getTitle(),
1383                                 wfMessage( 'nextrevision' )->escaped(),
1384                                 array(),
1385                                 array(
1386                                         'direction' => 'next',
1387                                         'oldid' => $oldid
1388                                 ) + $extraParams
1389                         );
1390                 $nextdiff = $current
1391                         ? wfMessage( 'diff' )->escaped()
1392                         : Linker::linkKnown(
1393                                 $this->getTitle(),
1394                                 wfMessage( 'diff' )->escaped(),
1395                                 array(),
1396                                 array(
1397                                         'diff' => 'next',
1398                                         'oldid' => $oldid
1399                                 ) + $extraParams
1400                         );
1401
1402                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1403                 if ( $cdel !== '' ) {
1404                         $cdel .= ' ';
1405                 }
1406
1407                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1408                         wfMessage( 'revision-nav' )->rawParams(
1409                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1410                         )->escaped() . "</div>" );
1411         }
1412
1413         /**
1414          * Return the HTML for the top of a redirect page
1415          *
1416          * Chances are you should just be using the ParserOutput from
1417          * WikitextContent::getParserOutput instead of calling this for redirects.
1418          *
1419          * @param $target Title|Array of destination(s) to redirect
1420          * @param $appendSubtitle Boolean [optional]
1421          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1422          * @return string containing HMTL with redirect link
1423          */
1424         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1425                 $lang = $this->getTitle()->getPageLanguage();
1426                 if ( $appendSubtitle ) {
1427                         $out = $this->getContext()->getOutput();
1428                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
1429                 }
1430                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1431         }
1432
1433         /**
1434          * Return the HTML for the top of a redirect page
1435          *
1436          * Chances are you should just be using the ParserOutput from
1437          * WikitextContent::getParserOutput instead of calling this for redirects.
1438          *
1439          * @since 1.23
1440          * @param Language $lang
1441          * @param Title|array $target destination(s) to redirect
1442          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1443          * @return string containing HMTL with redirect link
1444          */
1445         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1446                 global $wgStylePath;
1447
1448                 if ( !is_array( $target ) ) {
1449                         $target = array( $target );
1450                 }
1451
1452                 $imageDir = $lang->getDir();
1453
1454                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1455
1456                 /**
1457                  * @var $title Title
1458                  */
1459                 $title = array_shift( $target );
1460
1461                 if ( $forceKnown ) {
1462                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1463                 } else {
1464                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1465                 }
1466
1467                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1468                 $alt = $lang->isRTL() ? '←' : '→';
1469                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1470                 foreach ( $target as $rt ) {
1471                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1472                         if ( $forceKnown ) {
1473                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1474                         } else {
1475                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1476                         }
1477                 }
1478
1479                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1480                 return '<div class="redirectMsg">' .
1481                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1482                         '<span class="redirectText">' . $link . '</span></div>';
1483         }
1484
1485         /**
1486          * Handle action=render
1487          */
1488         public function render() {
1489                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1490                 $this->view();
1491         }
1492
1493         /**
1494          * action=protect handler
1495          */
1496         public function protect() {
1497                 $form = new ProtectionForm( $this );
1498                 $form->execute();
1499         }
1500
1501         /**
1502          * action=unprotect handler (alias)
1503          */
1504         public function unprotect() {
1505                 $this->protect();
1506         }
1507
1508         /**
1509          * UI entry point for page deletion
1510          */
1511         public function delete() {
1512                 # This code desperately needs to be totally rewritten
1513
1514                 $title = $this->getTitle();
1515                 $user = $this->getContext()->getUser();
1516
1517                 # Check permissions
1518                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1519                 if ( count( $permission_errors ) ) {
1520                         throw new PermissionsError( 'delete', $permission_errors );
1521                 }
1522
1523                 # Read-only check...
1524                 if ( wfReadOnly() ) {
1525                         throw new ReadOnlyError;
1526                 }
1527
1528                 # Better double-check that it hasn't been deleted yet!
1529                 $this->mPage->loadPageData( 'fromdbmaster' );
1530                 if ( !$this->mPage->exists() ) {
1531                         $deleteLogPage = new LogPage( 'delete' );
1532                         $outputPage = $this->getContext()->getOutput();
1533                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1534                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1535                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1536                                 );
1537                         $outputPage->addHTML(
1538                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1539                         );
1540                         LogEventsList::showLogExtract(
1541                                 $outputPage,
1542                                 'delete',
1543                                 $title
1544                         );
1545
1546                         return;
1547                 }
1548
1549                 $request = $this->getContext()->getRequest();
1550                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1551                 $deleteReason = $request->getText( 'wpReason' );
1552
1553                 if ( $deleteReasonList == 'other' ) {
1554                         $reason = $deleteReason;
1555                 } elseif ( $deleteReason != '' ) {
1556                         // Entry from drop down menu + additional comment
1557                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1558                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1559                 } else {
1560                         $reason = $deleteReasonList;
1561                 }
1562
1563                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1564                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1565                 ) {
1566                         # Flag to hide all contents of the archived revisions
1567                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1568
1569                         $this->doDelete( $reason, $suppress );
1570
1571                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1572
1573                         return;
1574                 }
1575
1576                 // Generate deletion reason
1577                 $hasHistory = false;
1578                 if ( !$reason ) {
1579                         try {
1580                                 $reason = $this->generateReason( $hasHistory );
1581                         } catch ( MWException $e ) {
1582                                 # if a page is horribly broken, we still want to be able to delete it. so be lenient about errors here.
1583                                 wfDebug( "Error while building auto delete summary: $e" );
1584                                 $reason = '';
1585                         }
1586                 }
1587
1588                 // If the page has a history, insert a warning
1589                 if ( $hasHistory ) {
1590                         $revisions = $this->mTitle->estimateRevisionCount();
1591                         // @todo FIXME: i18n issue/patchwork message
1592                         $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
1593                                 wfMessage( 'historywarning' )->numParams( $revisions )->parse() .
1594                                 wfMessage( 'word-separator' )->plain() . Linker::linkKnown( $title,
1595                                         wfMessage( 'history' )->escaped(),
1596                                         array( 'rel' => 'archives' ),
1597                                         array( 'action' => 'history' ) ) .
1598                                 '</strong>'
1599                         );
1600
1601                         if ( $this->mTitle->isBigDeletion() ) {
1602                                 global $wgDeleteRevisionsLimit;
1603                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1604                                         array( 'delete-warning-toobig', $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit ) ) );
1605                         }
1606                 }
1607
1608                 $this->confirmDelete( $reason );
1609         }
1610
1611         /**
1612          * Output deletion confirmation dialog
1613          * @todo FIXME: Move to another file?
1614          * @param string $reason prefilled reason
1615          */
1616         public function confirmDelete( $reason ) {
1617                 wfDebug( "Article::confirmDelete\n" );
1618
1619                 $outputPage = $this->getContext()->getOutput();
1620                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1621                 $outputPage->addBacklinkSubtitle( $this->getTitle() );
1622                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1623                 if ( $this->getTitle()->getBacklinkCache()->hasLinks( 'pagelinks' ) ) {
1624                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1625                                 'deleting-backlinks-warning' );
1626                 }
1627                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1628
1629                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1630
1631                 $user = $this->getContext()->getUser();
1632
1633                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1634                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1635                                         <td></td>
1636                                         <td class='mw-input'><strong>" .
1637                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1638                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1639                                         "</strong></td>
1640                                 </tr>";
1641                 } else {
1642                         $suppress = '';
1643                 }
1644                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $this->getTitle() );
1645
1646                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1647                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1648                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1649                         Xml::tags( 'legend', null, wfMessage( 'delete-legend' )->escaped() ) .
1650                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1651                         "<tr id=\"wpDeleteReasonListRow\">
1652                                 <td class='mw-label'>" .
1653                                         Xml::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1654                                 "</td>
1655                                 <td class='mw-input'>" .
1656                                         Xml::listDropDown( 'wpDeleteReasonList',
1657                                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1658                                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(), '', 'wpReasonDropDown', 1 ) .
1659                                 "</td>
1660                         </tr>
1661                         <tr id=\"wpDeleteReasonRow\">
1662                                 <td class='mw-label'>" .
1663                                         Xml::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1664                                 "</td>
1665                                 <td class='mw-input'>" .
1666                                 Html::input( 'wpReason', $reason, 'text', array(
1667                                         'size' => '60',
1668                                         'maxlength' => '255',
1669                                         'tabindex' => '2',
1670                                         'id' => 'wpReason',
1671                                         'autofocus'
1672                                 ) ) .
1673                                 "</td>
1674                         </tr>";
1675
1676                 # Disallow watching if user is not logged in
1677                 if ( $user->isLoggedIn() ) {
1678                         $form .= "
1679                         <tr>
1680                                 <td></td>
1681                                 <td class='mw-input'>" .
1682                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1683                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1684                                 "</td>
1685                         </tr>";
1686                 }
1687
1688                 $form .= "
1689                         $suppress
1690                         <tr>
1691                                 <td></td>
1692                                 <td class='mw-submit'>" .
1693                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1694                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1695                                 "</td>
1696                         </tr>" .
1697                         Xml::closeElement( 'table' ) .
1698                         Xml::closeElement( 'fieldset' ) .
1699                         Html::hidden( 'wpEditToken', $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1700                         Xml::closeElement( 'form' );
1701
1702                         if ( $user->isAllowed( 'editinterface' ) ) {
1703                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1704                                 $link = Linker::link(
1705                                         $title,
1706                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1707                                         array(),
1708                                         array( 'action' => 'edit' )
1709                                 );
1710                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1711                         }
1712
1713                 $outputPage->addHTML( $form );
1714
1715                 $deleteLogPage = new LogPage( 'delete' );
1716                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1717                 LogEventsList::showLogExtract( $outputPage, 'delete',
1718                         $this->getTitle()
1719                 );
1720         }
1721
1722         /**
1723          * Perform a deletion and output success or failure messages
1724          * @param $reason
1725          * @param $suppress bool
1726          */
1727         public function doDelete( $reason, $suppress = false ) {
1728                 $error = '';
1729                 $outputPage = $this->getContext()->getOutput();
1730                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1731                 if ( $status->isGood() ) {
1732                         $deleted = $this->getTitle()->getPrefixedText();
1733
1734                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1735                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1736
1737                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1738
1739                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1740                         $outputPage->returnToMain( false );
1741                 } else {
1742                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1743                         if ( $error == '' ) {
1744                                 $outputPage->addWikiText(
1745                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1746                                 );
1747                                 $deleteLogPage = new LogPage( 'delete' );
1748                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1749
1750                                 LogEventsList::showLogExtract(
1751                                         $outputPage,
1752                                         'delete',
1753                                         $this->getTitle()
1754                                 );
1755                         } else {
1756                                 $outputPage->addHTML( $error );
1757                         }
1758                 }
1759         }
1760
1761         /* Caching functions */
1762
1763         /**
1764          * checkLastModified returns true if it has taken care of all
1765          * output to the client that is necessary for this request.
1766          * (that is, it has sent a cached version of the page)
1767          *
1768          * @return boolean true if cached version send, false otherwise
1769          */
1770         protected function tryFileCache() {
1771                 static $called = false;
1772
1773                 if ( $called ) {
1774                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1775                         return false;
1776                 }
1777
1778                 $called = true;
1779                 if ( $this->isFileCacheable() ) {
1780                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1781                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1782                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1783                                 $cache->loadFromFileCache( $this->getContext() );
1784                                 return true;
1785                         } else {
1786                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1787                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1788                         }
1789                 } else {
1790                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1791                 }
1792
1793                 return false;
1794         }
1795
1796         /**
1797          * Check if the page can be cached
1798          * @return bool
1799          */
1800         public function isFileCacheable() {
1801                 $cacheable = false;
1802
1803                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1804                         $cacheable = $this->mPage->getID()
1805                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1806                         // Extension may have reason to disable file caching on some pages.
1807                         if ( $cacheable ) {
1808                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1809                         }
1810                 }
1811
1812                 return $cacheable;
1813         }
1814
1815         /**#@-*/
1816
1817         /**
1818          * Lightweight method to get the parser output for a page, checking the parser cache
1819          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1820          * consider, so it's not appropriate to use there.
1821          *
1822          * @since 1.16 (r52326) for LiquidThreads
1823          *
1824          * @param $oldid mixed integer Revision ID or null
1825          * @param $user User The relevant user
1826          * @return ParserOutput or false if the given revision ID is not found
1827          */
1828         public function getParserOutput( $oldid = null, User $user = null ) {
1829                 //XXX: bypasses mParserOptions and thus setParserOptions()
1830
1831                 if ( $user === null ) {
1832                         $parserOptions = $this->getParserOptions();
1833                 } else {
1834                         $parserOptions = $this->mPage->makeParserOptions( $user );
1835                 }
1836
1837                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1838         }
1839
1840         /**
1841          * Override the ParserOptions used to render the primary article wikitext.
1842          *
1843          * @param ParserOptions $options
1844          * @throws MWException if the parser options where already initialized.
1845          */
1846         public function setParserOptions( ParserOptions $options ) {
1847                 if ( $this->mParserOptions ) {
1848                         throw new MWException( "can't change parser options after they have already been set" );
1849                 }
1850
1851                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1852                 $this->mParserOptions = clone $options;
1853         }
1854
1855         /**
1856          * Get parser options suitable for rendering the primary article wikitext
1857          * @return ParserOptions
1858          */
1859         public function getParserOptions() {
1860                 if ( !$this->mParserOptions ) {
1861                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1862                 }
1863                 // Clone to allow modifications of the return value without affecting cache
1864                 return clone $this->mParserOptions;
1865         }
1866
1867         /**
1868          * Sets the context this Article is executed in
1869          *
1870          * @param $context IContextSource
1871          * @since 1.18
1872          */
1873         public function setContext( $context ) {
1874                 $this->mContext = $context;
1875         }
1876
1877         /**
1878          * Gets the context this Article is executed in
1879          *
1880          * @return IContextSource
1881          * @since 1.18
1882          */
1883         public function getContext() {
1884                 if ( $this->mContext instanceof IContextSource ) {
1885                         return $this->mContext;
1886                 } else {
1887                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1888                         return RequestContext::getMain();
1889                 }
1890         }
1891
1892         /**
1893          * Info about this page
1894          * @deprecated since 1.19
1895          */
1896         public function info() {
1897                 wfDeprecated( __METHOD__, '1.19' );
1898                 Action::factory( 'info', $this )->show();
1899         }
1900
1901         /**
1902          * Mark this particular edit/page as patrolled
1903          * @deprecated since 1.18
1904          */
1905         public function markpatrolled() {
1906                 wfDeprecated( __METHOD__, '1.18' );
1907                 Action::factory( 'markpatrolled', $this )->show();
1908         }
1909
1910         /**
1911          * Handle action=purge
1912          * @deprecated since 1.19
1913          * @return Action|bool|null false if the action is disabled, null if it is not recognised
1914          */
1915         public function purge() {
1916                 return Action::factory( 'purge', $this )->show();
1917         }
1918
1919         /**
1920          * Handle action=revert
1921          * @deprecated since 1.19
1922          */
1923         public function revert() {
1924                 wfDeprecated( __METHOD__, '1.19' );
1925                 Action::factory( 'revert', $this )->show();
1926         }
1927
1928         /**
1929          * Handle action=rollback
1930          * @deprecated since 1.19
1931          */
1932         public function rollback() {
1933                 wfDeprecated( __METHOD__, '1.19' );
1934                 Action::factory( 'rollback', $this )->show();
1935         }
1936
1937         /**
1938          * User-interface handler for the "watch" action.
1939          * Requires Request to pass a token as of 1.18.
1940          * @deprecated since 1.18
1941          */
1942         public function watch() {
1943                 wfDeprecated( __METHOD__, '1.18' );
1944                 Action::factory( 'watch', $this )->show();
1945         }
1946
1947         /**
1948          * Add this page to the current user's watchlist
1949          *
1950          * This is safe to be called multiple times
1951          *
1952          * @return bool true on successful watch operation
1953          * @deprecated since 1.18
1954          */
1955         public function doWatch() {
1956                 wfDeprecated( __METHOD__, '1.18' );
1957                 return WatchAction::doWatch( $this->getTitle(), $this->getContext()->getUser() );
1958         }
1959
1960         /**
1961          * User interface handler for the "unwatch" action.
1962          * Requires Request to pass a token as of 1.18.
1963          * @deprecated since 1.18
1964          */
1965         public function unwatch() {
1966                 wfDeprecated( __METHOD__, '1.18' );
1967                 Action::factory( 'unwatch', $this )->show();
1968         }
1969
1970         /**
1971          * Stop watching a page
1972          * @return bool true on successful unwatch
1973          * @deprecated since 1.18
1974          */
1975         public function doUnwatch() {
1976                 wfDeprecated( __METHOD__, '1.18' );
1977                 return WatchAction::doUnwatch( $this->getTitle(), $this->getContext()->getUser() );
1978         }
1979
1980         /**
1981          * Output a redirect back to the article.
1982          * This is typically used after an edit.
1983          *
1984          * @deprecated in 1.18; call OutputPage::redirect() directly
1985          * @param $noRedir Boolean: add redirect=no
1986          * @param string $sectionAnchor section to redirect to, including "#"
1987          * @param string $extraQuery extra query params
1988          */
1989         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1990                 wfDeprecated( __METHOD__, '1.18' );
1991                 if ( $noRedir ) {
1992                         $query = 'redirect=no';
1993                         if ( $extraQuery ) {
1994                                 $query .= "&$extraQuery";
1995                         }
1996                 } else {
1997                         $query = $extraQuery;
1998                 }
1999
2000                 $this->getContext()->getOutput()->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
2001         }
2002
2003         /**
2004          * Use PHP's magic __get handler to handle accessing of
2005          * raw WikiPage fields for backwards compatibility.
2006          *
2007          * @param string $fname Field name
2008          */
2009         public function __get( $fname ) {
2010                 if ( property_exists( $this->mPage, $fname ) ) {
2011                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
2012                         return $this->mPage->$fname;
2013                 }
2014                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2015         }
2016
2017         /**
2018          * Use PHP's magic __set handler to handle setting of
2019          * raw WikiPage fields for backwards compatibility.
2020          *
2021          * @param string $fname Field name
2022          * @param $fvalue mixed New value
2023          */
2024         public function __set( $fname, $fvalue ) {
2025                 if ( property_exists( $this->mPage, $fname ) ) {
2026                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
2027                         $this->mPage->$fname = $fvalue;
2028                 // Note: extensions may want to toss on new fields
2029                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
2030                         $this->mPage->$fname = $fvalue;
2031                 } else {
2032                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2033                 }
2034         }
2035
2036         /**
2037          * Use PHP's magic __call handler to transform instance calls to
2038          * WikiPage functions for backwards compatibility.
2039          *
2040          * @param string $fname Name of called method
2041          * @param array $args Arguments to the method
2042          * @return mixed
2043          */
2044         public function __call( $fname, $args ) {
2045                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2046                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2047                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2048                 }
2049                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2050         }
2051
2052         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2053
2054         /**
2055          * @param $limit array
2056          * @param $expiry array
2057          * @param $cascade bool
2058          * @param $reason string
2059          * @param $user User
2060          * @return Status
2061          */
2062         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2063                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2064         }
2065
2066         /**
2067          * @param $limit array
2068          * @param $reason string
2069          * @param $cascade int
2070          * @param $expiry array
2071          * @return bool
2072          */
2073         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2074                 return $this->mPage->doUpdateRestrictions(
2075                         $limit,
2076                         $expiry,
2077                         $cascade,
2078                         $reason,
2079                         $this->getContext()->getUser()
2080                 );
2081         }
2082
2083         /**
2084          * @param $reason string
2085          * @param $suppress bool
2086          * @param $id int
2087          * @param $commit bool
2088          * @param $error string
2089          * @return bool
2090          */
2091         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2092                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2093         }
2094
2095         /**
2096          * @param $fromP
2097          * @param $summary
2098          * @param $token
2099          * @param $bot
2100          * @param $resultDetails
2101          * @param $user User
2102          * @return array
2103          */
2104         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2105                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2106                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2107         }
2108
2109         /**
2110          * @param $fromP
2111          * @param $summary
2112          * @param $bot
2113          * @param $resultDetails
2114          * @param $guser User
2115          * @return array
2116          */
2117         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2118                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2119                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2120         }
2121
2122         /**
2123          * @param $hasHistory bool
2124          * @return mixed
2125          */
2126         public function generateReason( &$hasHistory ) {
2127                 $title = $this->mPage->getTitle();
2128                 $handler = ContentHandler::getForTitle( $title );
2129                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2130         }
2131
2132         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2133
2134         /**
2135          * @return array
2136          */
2137         public static function selectFields() {
2138                 return WikiPage::selectFields();
2139         }
2140
2141         /**
2142          * @param $title Title
2143          */
2144         public static function onArticleCreate( $title ) {
2145                 WikiPage::onArticleCreate( $title );
2146         }
2147
2148         /**
2149          * @param $title Title
2150          */
2151         public static function onArticleDelete( $title ) {
2152                 WikiPage::onArticleDelete( $title );
2153         }
2154
2155         /**
2156          * @param $title Title
2157          */
2158         public static function onArticleEdit( $title ) {
2159                 WikiPage::onArticleEdit( $title );
2160         }
2161
2162         /**
2163          * @param $oldtext
2164          * @param $newtext
2165          * @param $flags
2166          * @return string
2167          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2168          */
2169         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2170                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2171         }
2172         // ******
2173 }