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