includes/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class Article implements Page {
  37         /**@{{
  38          * @private
  39          */
  40
  41         /**
  42          * The context this Article is executed in
  43          * @var IContextSource $mContext
  44          */
  45         protected $mContext;
  46
  47         /**
  48          * The WikiPage object of this instance
  49          * @var WikiPage $mPage
  50          */
  51         protected $mPage;
  52
  53         /**
  54          * ParserOptions object for $wgUser articles
  55          * @var ParserOptions $mParserOptions
  56          */
  57         public $mParserOptions;
  58
  59         /**
  60          * Text of the revision we are working on
  61          * @var string $mContent
  62          */
  63         var $mContent;                    // !< #BC cruft
  64
  65         /**
  66          * Content of the revision we are working on
  67          * @var Content
  68          * @since 1.21
  69          */
  70         var $mContentObject;              // !<
  71
  72         /**
  73          * Is the content ($mContent) already loaded?
  74          * @var bool $mContentLoaded
  75          */
  76         var $mContentLoaded = false;      // !<
  77
  78         /**
  79          * The oldid of the article that is to be shown, 0 for the
  80          * current revision
  81          * @var int|null $mOldId
  82          */
  83         var $mOldId;                      // !<
  84
  85         /**
  86          * Title from which we were redirected here
  87          * @var Title $mRedirectedFrom
  88          */
  89         var $mRedirectedFrom = null;
  90
  91         /**
  92          * URL to redirect to or false if none
  93          * @var string|false $mRedirectUrl
  94          */
  95         var $mRedirectUrl = false;        // !<
  96
  97         /**
  98          * Revision ID of revision we are working on
  99          * @var int $mRevIdFetched
 100          */
 101         var $mRevIdFetched = 0;           // !<
 102
 103         /**
 104          * Revision we are working on
 105          * @var Revision $mRevision
 106          */
 107         var $mRevision = null;
 108
 109         /**
 110          * ParserOutput object
 111          * @var ParserOutput $mParserOutput
 112          */
 113         var $mParserOutput;
 114
 115         /**@}}*/
 116
 117         /**
 118          * Constructor and clear the article
 119          * @param $title Title Reference to a Title object.
 120          * @param $oldId Integer revision ID, null to fetch from request, zero for current
 121          */
 122         public function __construct( Title $title, $oldId = null ) {
 123                 $this->mOldId = $oldId;
 124                 $this->mPage = $this->newPage( $title );
 125         }
 126
 127         /**
 128          * @param $title Title
 129          * @return WikiPage
 130          */
 131         protected function newPage( Title $title ) {
 132                 return new WikiPage( $title );
 133         }
 134
 135         /**
 136          * Constructor from a page id
 137          * @param int $id article ID to load
 138          * @return Article|null
 139          */
 140         public static function newFromID( $id ) {
 141                 $t = Title::newFromID( $id );
 142                 # @todo FIXME: Doesn't inherit right
 143                 return $t == null ? null : new self( $t );
 144                 # return $t == null ? null : new static( $t ); // PHP 5.3
 145         }
 146
 147         /**
 148          * Create an Article object of the appropriate class for the given page.
 149          *
 150          * @param $title Title
 151          * @param $context IContextSource
 152          * @return Article object
 153          */
 154         public static function newFromTitle( $title, IContextSource $context ) {
 155                 if ( NS_MEDIA == $title->getNamespace() ) {
 156                         // FIXME: where should this go?
 157                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 158                 }
 159
 160                 $page = null;
 161                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 162                 if ( !$page ) {
 163                         switch ( $title->getNamespace() ) {
 164                                 case NS_FILE:
 165                                         $page = new ImagePage( $title );
 166                                         break;
 167                                 case NS_CATEGORY:
 168                                         $page = new CategoryPage( $title );
 169                                         break;
 170                                 default:
 171                                         $page = new Article( $title );
 172                         }
 173                 }
 174                 $page->setContext( $context );
 175
 176                 return $page;
 177         }
 178
 179         /**
 180          * Create an Article object of the appropriate class for the given page.
 181          *
 182          * @param $page WikiPage
 183          * @param $context IContextSource
 184          * @return Article object
 185          */
 186         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 187                 $article = self::newFromTitle( $page->getTitle(), $context );
 188                 $article->mPage = $page; // override to keep process cached vars
 189                 return $article;
 190         }
 191
 192         /**
 193          * Tell the page view functions that this view was redirected
 194          * from another page on the wiki.
 195          * @param $from Title object.
 196          */
 197         public function setRedirectedFrom( Title $from ) {
 198                 $this->mRedirectedFrom = $from;
 199         }
 200
 201         /**
 202          * Get the title object of the article
 203          *
 204          * @return Title object of this page
 205          */
 206         public function getTitle() {
 207                 return $this->mPage->getTitle();
 208         }
 209
 210         /**
 211          * Get the WikiPage object of this instance
 212          *
 213          * @since 1.19
 214          * @return WikiPage
 215          */
 216         public function getPage() {
 217                 return $this->mPage;
 218         }
 219
 220         /**
 221          * Clear the object
 222          */
 223         public function clear() {
 224                 $this->mContentLoaded = false;
 225
 226                 $this->mRedirectedFrom = null; # Title object if set
 227                 $this->mRevIdFetched = 0;
 228                 $this->mRedirectUrl = false;
 229
 230                 $this->mPage->clear();
 231         }
 232
 233         /**
 234          * Note that getContent/loadContent do not follow redirects anymore.
 235          * If you need to fetch redirectable content easily, try
 236          * the shortcut in WikiPage::getRedirectTarget()
 237          *
 238          * This function has side effects! Do not use this function if you
 239          * only want the real revision text if any.
 240          *
 241          * @deprecated in 1.21; use WikiPage::getContent() instead
 242          *
 243          * @return string Return the text of this revision
 244          */
 245         public function getContent() {
 246                 ContentHandler::deprecated( __METHOD__, '1.21' );
 247                 $content = $this->getContentObject();
 248                 return ContentHandler::getContentText( $content );
 249         }
 250
 251         /**
 252          * Returns a Content object representing the pages effective display content,
 253          * not necessarily the revision's content!
 254          *
 255          * Note that getContent/loadContent do not follow redirects anymore.
 256          * If you need to fetch redirectable content easily, try
 257          * the shortcut in WikiPage::getRedirectTarget()
 258          *
 259          * This function has side effects! Do not use this function if you
 260          * only want the real revision text if any.
 261          *
 262          * @return Content Return the content of this revision
 263          *
 264          * @since 1.21
 265          */
 266         protected function getContentObject() {
 267                 wfProfileIn( __METHOD__ );
 268
 269                 if ( $this->mPage->getID() === 0 ) {
 270                         # If this is a MediaWiki:x message, then load the messages
 271                         # and return the message value for x.
 272                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 273                                 $text = $this->getTitle()->getDefaultMessageText();
 274                                 if ( $text === false ) {
 275                                         $text = '';
 276                                 }
 277
 278                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 279                         } else {
 280                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 281                                 $content = new MessageContent( $message, null, 'parsemag' );
 282                         }
 283                 } else {
 284                         $this->fetchContentObject();
 285                         $content = $this->mContentObject;
 286                 }
 287
 288                 wfProfileOut( __METHOD__ );
 289                 return $content;
 290         }
 291
 292         /**
 293          * @return int The oldid of the article that is to be shown, 0 for the
 294          *             current revision
 295          */
 296         public function getOldID() {
 297                 if ( is_null( $this->mOldId ) ) {
 298                         $this->mOldId = $this->getOldIDFromRequest();
 299                 }
 300
 301                 return $this->mOldId;
 302         }
 303
 304         /**
 305          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 306          *
 307          * @return int The old id for the request
 308          */
 309         public function getOldIDFromRequest() {
 310                 $this->mRedirectUrl = false;
 311
 312                 $request = $this->getContext()->getRequest();
 313                 $oldid = $request->getIntOrNull( 'oldid' );
 314
 315                 if ( $oldid === null ) {
 316                         return 0;
 317                 }
 318
 319                 if ( $oldid !== 0 ) {
 320                         # Load the given revision and check whether the page is another one.
 321                         # In that case, update this instance to reflect the change.
 322                         if ( $oldid === $this->mPage->getLatest() ) {
 323                                 $this->mRevision = $this->mPage->getRevision();
 324                         } else {
 325                                 $this->mRevision = Revision::newFromId( $oldid );
 326                                 if ( $this->mRevision !== null ) {
 327                                         // Revision title doesn't match the page title given?
 328                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 329                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 330                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 331                                         }
 332                                 }
 333                         }
 334                 }
 335
 336                 if ( $request->getVal( 'direction' ) == 'next' ) {
 337                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 338                         if ( $nextid ) {
 339                                 $oldid = $nextid;
 340                                 $this->mRevision = null;
 341                         } else {
 342                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 343                         }
 344                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 345                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 346                         if ( $previd ) {
 347                                 $oldid = $previd;
 348                                 $this->mRevision = null;
 349                         }
 350                 }
 351
 352                 return $oldid;
 353         }
 354
 355         /**
 356          * Load the revision (including text) into this object
 357          *
 358          * @deprecated in 1.19; use fetchContent()
 359          */
 360         function loadContent() {
 361                 wfDeprecated( __METHOD__, '1.19' );
 362                 $this->fetchContent();
 363         }
 364
 365         /**
 366          * Get text of an article from database
 367          * Does *NOT* follow redirects.
 368          *
 369          * @protected
 370          * @note this is really internal functionality that should really NOT be used by other functions. For accessing
 371          *       article content, use the WikiPage class, especially WikiBase::getContent(). However, a lot of legacy code
 372          *       uses this method to retrieve page text from the database, so the function has to remain public for now.
 373          *
 374          * @return mixed string containing article contents, or false if null
 375          * @deprecated in 1.21, use WikiPage::getContent() instead
 376          */
 377         function fetchContent() { #BC cruft!
 378                 ContentHandler::deprecated( __METHOD__, '1.21' );
 379
 380                 if ( $this->mContentLoaded && $this->mContent ) {
 381                         return $this->mContent;
 382                 }
 383
 384                 wfProfileIn( __METHOD__ );
 385
 386                 $content = $this->fetchContentObject();
 387
 388                 // @todo Get rid of mContent everywhere!
 389                 $this->mContent = ContentHandler::getContentText( $content );
 390                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 391
 392                 wfProfileOut( __METHOD__ );
 393
 394                 return $this->mContent;
 395         }
 396
 397         /**
 398          * Get text content object
 399          * Does *NOT* follow redirects.
 400          * TODO: when is this null?
 401          *
 402          * @note code that wants to retrieve page content from the database should use WikiPage::getContent().
 403          *
 404          * @return Content|null|boolean false
 405          *
 406          * @since 1.21
 407          */
 408         protected function fetchContentObject() {
 409                 if ( $this->mContentLoaded ) {
 410                         return $this->mContentObject;
 411                 }
 412
 413                 wfProfileIn( __METHOD__ );
 414
 415                 $this->mContentLoaded = true;
 416                 $this->mContent = null;
 417
 418                 $oldid = $this->getOldID();
 419
 420                 # Pre-fill content with error message so that if something
 421                 # fails we'll have something telling us what we intended.
 422                 //XXX: this isn't page content but a UI message. horrible.
 423                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 424
 425                 if ( $oldid ) {
 426                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 427                         if ( !$this->mRevision ) {
 428                                 $this->mRevision = Revision::newFromId( $oldid );
 429                                 if ( !$this->mRevision ) {
 430                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 431                                         wfProfileOut( __METHOD__ );
 432                                         return false;
 433                                 }
 434                         }
 435                 } else {
 436                         if ( !$this->mPage->getLatest() ) {
 437                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 438                                 wfProfileOut( __METHOD__ );
 439                                 return false;
 440                         }
 441
 442                         $this->mRevision = $this->mPage->getRevision();
 443
 444                         if ( !$this->mRevision ) {
 445                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 446                                 wfProfileOut( __METHOD__ );
 447                                 return false;
 448                         }
 449                 }
 450
 451                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 452                 // We should instead work with the Revision object when we need it...
 453                 $this->mContentObject = $this->mRevision->getContent( Revision::FOR_THIS_USER, $this->getContext()->getUser() ); // Loads if user is allowed
 454                 $this->mRevIdFetched = $this->mRevision->getId();
 455
 456                 wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 457
 458                 wfProfileOut( __METHOD__ );
 459
 460                 return $this->mContentObject;
 461         }
 462
 463         /**
 464          * No-op
 465          * @deprecated since 1.18
 466          */
 467         public function forUpdate() {
 468                 wfDeprecated( __METHOD__, '1.18' );
 469         }
 470
 471         /**
 472          * Returns true if the currently-referenced revision is the current edit
 473          * to this page (and it exists).
 474          * @return bool
 475          */
 476         public function isCurrent() {
 477                 # If no oldid, this is the current version.
 478                 if ( $this->getOldID() == 0 ) {
 479                         return true;
 480                 }
 481
 482                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 483         }
 484
 485         /**
 486          * Get the fetched Revision object depending on request parameters or null
 487          * on failure.
 488          *
 489          * @since 1.19
 490          * @return Revision|null
 491          */
 492         public function getRevisionFetched() {
 493                 $this->fetchContentObject();
 494
 495                 return $this->mRevision;
 496         }
 497
 498         /**
 499          * Use this to fetch the rev ID used on page views
 500          *
 501          * @return int revision ID of last article revision
 502          */
 503         public function getRevIdFetched() {
 504                 if ( $this->mRevIdFetched ) {
 505                         return $this->mRevIdFetched;
 506                 } else {
 507                         return $this->mPage->getLatest();
 508                 }
 509         }
 510
 511         /**
 512          * This is the default action of the index.php entry point: just view the
 513          * page of the given title.
 514          */
 515         public function view() {
 516                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 517
 518                 wfProfileIn( __METHOD__ );
 519
 520                 # Get variables from query string
 521                 # As side effect this will load the revision and update the title
 522                 # in a revision ID is passed in the request, so this should remain
 523                 # the first call of this method even if $oldid is used way below.
 524                 $oldid = $this->getOldID();
 525
 526                 $user = $this->getContext()->getUser();
 527                 # Another whitelist check in case getOldID() is altering the title
 528                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 529                 if ( count( $permErrors ) ) {
 530                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 531                         wfProfileOut( __METHOD__ );
 532                         throw new PermissionsError( 'read', $permErrors );
 533                 }
 534
 535                 $outputPage = $this->getContext()->getOutput();
 536                 # getOldID() may as well want us to redirect somewhere else
 537                 if ( $this->mRedirectUrl ) {
 538                         $outputPage->redirect( $this->mRedirectUrl );
 539                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 540                         wfProfileOut( __METHOD__ );
 541
 542                         return;
 543                 }
 544
 545                 # If we got diff in the query, we want to see a diff page instead of the article.
 546                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 547                         wfDebug( __METHOD__ . ": showing diff page\n" );
 548                         $this->showDiffPage();
 549                         wfProfileOut( __METHOD__ );
 550
 551                         return;
 552                 }
 553
 554                 # Set page title (may be overridden by DISPLAYTITLE)
 555                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 556
 557                 $outputPage->setArticleFlag( true );
 558                 # Allow frames by default
 559                 $outputPage->allowClickjacking();
 560
 561                 $parserCache = ParserCache::singleton();
 562
 563                 $parserOptions = $this->getParserOptions();
 564                 # Render printable version, use printable version cache
 565                 if ( $outputPage->isPrintable() ) {
 566                         $parserOptions->setIsPrintable( true );
 567                         $parserOptions->setEditSection( false );
 568                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 569                         $parserOptions->setEditSection( false );
 570                 }
 571
 572                 # Try client and file cache
 573                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 574                         if ( $wgUseETag ) {
 575                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 576                         }
 577
 578                         # Is it client cached?
 579                         if ( $outputPage->checkLastModified( $this->mPage->getTouched() ) ) {
 580                                 wfDebug( __METHOD__ . ": done 304\n" );
 581                                 wfProfileOut( __METHOD__ );
 582
 583                                 return;
 584                         # Try file cache
 585                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 586                                 wfDebug( __METHOD__ . ": done file cache\n" );
 587                                 # tell wgOut that output is taken care of
 588                                 $outputPage->disable();
 589                                 $this->mPage->doViewUpdates( $user, $oldid );
 590                                 wfProfileOut( __METHOD__ );
 591
 592                                 return;
 593                         }
 594                 }
 595
 596                 # Should the parser cache be used?
 597                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 598                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 599                 if ( $user->getStubThreshold() ) {
 600                         wfIncrStats( 'pcache_miss_stub' );
 601                 }
 602
 603                 $this->showRedirectedFromHeader();
 604                 $this->showNamespaceHeader();
 605
 606                 # Iterate through the possible ways of constructing the output text.
 607                 # Keep going until $outputDone is set, or we run out of things to do.
 608                 $pass = 0;
 609                 $outputDone = false;
 610                 $this->mParserOutput = false;
 611
 612                 while ( !$outputDone && ++$pass ) {
 613                         switch ( $pass ) {
 614                                 case 1:
 615                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 616                                         break;
 617                                 case 2:
 618                                         # Early abort if the page doesn't exist
 619                                         if ( !$this->mPage->exists() ) {
 620                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 621                                                 $this->showMissingArticle();
 622                                                 wfProfileOut( __METHOD__ );
 623                                                 return;
 624                                         }
 625
 626                                         # Try the parser cache
 627                                         if ( $useParserCache ) {
 628                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 629
 630                                                 if ( $this->mParserOutput !== false ) {
 631                                                         if ( $oldid ) {
 632                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 633                                                                 $this->setOldSubtitle( $oldid );
 634                                                         } else {
 635                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 636                                                         }
 637                                                         $outputPage->addParserOutput( $this->mParserOutput );
 638                                                         # Ensure that UI elements requiring revision ID have
 639                                                         # the correct version information.
 640                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 641                                                         # Preload timestamp to avoid a DB hit
 642                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 643                                                         if ( $cachedTimestamp !== null ) {
 644                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 645                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 646                                                         }
 647                                                         $outputDone = true;
 648                                                 }
 649                                         }
 650                                         break;
 651                                 case 3:
 652                                         # This will set $this->mRevision if needed
 653                                         $this->fetchContentObject();
 654
 655                                         # Are we looking at an old revision
 656                                         if ( $oldid && $this->mRevision ) {
 657                                                 $this->setOldSubtitle( $oldid );
 658
 659                                                 if ( !$this->showDeletedRevisionHeader() ) {
 660                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 661                                                         wfProfileOut( __METHOD__ );
 662                                                         return;
 663                                                 }
 664                                         }
 665
 666                                         # Ensure that UI elements requiring revision ID have
 667                                         # the correct version information.
 668                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 669                                         # Preload timestamp to avoid a DB hit
 670                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 671
 672                                         # Pages containing custom CSS or JavaScript get special treatment
 673                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 674                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 675                                                 $this->showCssOrJsPage();
 676                                                 $outputDone = true;
 677                                         } elseif ( !wfRunHooks( 'ArticleContentViewCustom',
 678                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 679
 680                                                 # Allow extensions do their own custom view for certain pages
 681                                                 $outputDone = true;
 682                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 683                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 684
 685                                                 # Allow extensions do their own custom view for certain pages
 686                                                 $outputDone = true;
 687                                         }
 688                                         break;
 689                                 case 4:
 690                                         # Run the parse, protected by a pool counter
 691                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 692
 693                                         $content = $this->getContentObject();
 694                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 695                                                 $this->getRevIdFetched(), $useParserCache, $content );
 696
 697                                         if ( !$poolArticleView->execute() ) {
 698                                                 $error = $poolArticleView->getError();
 699                                                 if ( $error ) {
 700                                                         $outputPage->clearHTML(); // for release() errors
 701                                                         $outputPage->enableClientCache( false );
 702                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 703
 704                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 705                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 706                                                 }
 707                                                 # Connection or timeout error
 708                                                 wfProfileOut( __METHOD__ );
 709                                                 return;
 710                                         }
 711
 712                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 713                                         $outputPage->addParserOutput( $this->mParserOutput );
 714                                         if ( $content->getRedirectTarget() ) {
 715                                                 $outputPage->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
 716                                         }
 717
 718                                         # Don't cache a dirty ParserOutput object
 719                                         if ( $poolArticleView->getIsDirty() ) {
 720                                                 $outputPage->setSquidMaxage( 0 );
 721                                                 $outputPage->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
 722                                         }
 723
 724                                         $outputDone = true;
 725                                         break;
 726                                 # Should be unreachable, but just in case...
 727                                 default:
 728                                         break 2;
 729                         }
 730                 }
 731
 732                 # Get the ParserOutput actually *displayed* here.
 733                 # Note that $this->mParserOutput is the *current* version output.
 734                 $pOutput = ( $outputDone instanceof ParserOutput )
 735                         ? $outputDone // object fetched by hook
 736                         : $this->mParserOutput;
 737
 738                 # Adjust title for main page & pages with displaytitle
 739                 if ( $pOutput ) {
 740                         $this->adjustDisplayTitle( $pOutput );
 741                 }
 742
 743                 # For the main page, overwrite the <title> element with the con-
 744                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 745                 # that's not empty).
 746                 # This message always exists because it is in the i18n files
 747                 if ( $this->getTitle()->isMainPage() ) {
 748                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 749                         if ( !$msg->isDisabled() ) {
 750                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 751                         }
 752                 }
 753
 754                 # Check for any __NOINDEX__ tags on the page using $pOutput
 755                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 756                 $outputPage->setIndexPolicy( $policy['index'] );
 757                 $outputPage->setFollowPolicy( $policy['follow'] );
 758
 759                 $this->showViewFooter();
 760                 $this->mPage->doViewUpdates( $user, $oldid );
 761
 762                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 763
 764                 wfProfileOut( __METHOD__ );
 765         }
 766
 767         /**
 768          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 769          * @param $pOutput ParserOutput
 770          */
 771         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 772                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 773                 $titleText = $pOutput->getTitleText();
 774                 if ( strval( $titleText ) !== '' ) {
 775                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 776                 }
 777         }
 778
 779         /**
 780          * Show a diff page according to current request variables. For use within
 781          * Article::view() only, other callers should use the DifferenceEngine class.
 782          *
 783          * @todo Make protected
 784          */
 785         public function showDiffPage() {
 786                 $request = $this->getContext()->getRequest();
 787                 $user = $this->getContext()->getUser();
 788                 $diff = $request->getVal( 'diff' );
 789                 $rcid = $request->getVal( 'rcid' );
 790                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 791                 $purge = $request->getVal( 'action' ) == 'purge';
 792                 $unhide = $request->getInt( 'unhide' ) == 1;
 793                 $oldid = $this->getOldID();
 794
 795                 $rev = $this->getRevisionFetched();
 796
 797                 if ( !$rev ) {
 798                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 799                         $this->getContext()->getOutput()->addWikiMsg( 'difference-missing-revision', $oldid, 1 );
 800                         return;
 801                 }
 802
 803                 $contentHandler = $rev->getContentHandler();
 804                 $de = $contentHandler->createDifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 805
 806                 // DifferenceEngine directly fetched the revision:
 807                 $this->mRevIdFetched = $de->mNewid;
 808                 $de->showDiffPage( $diffOnly );
 809
 810                 // Run view updates for the newer revision being diffed (and shown below the diff if not $diffOnly)
 811                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 812                 // New can be false, convert it to 0 - this conveniently means the latest revision
 813                 $this->mPage->doViewUpdates( $user, (int)$new );
 814         }
 815
 816         /**
 817          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 818          * Article::view() only.
 819          *
 820          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 821          * page views.
 822          *
 823          * @param bool $showCacheHint whether to show a message telling the user to clear the browser cache (default: true).
 824          */
 825         protected function showCssOrJsPage( $showCacheHint = true ) {
 826                 $outputPage = $this->getContext()->getOutput();
 827
 828                 if ( $showCacheHint ) {
 829                         $dir = $this->getContext()->getLanguage()->getDir();
 830                         $lang = $this->getContext()->getLanguage()->getCode();
 831
 832                         $outputPage->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 833                                 'clearyourcache' );
 834                 }
 835
 836                 $this->fetchContentObject();
 837
 838                 if ( $this->mContentObject ) {
 839                         // Give hooks a chance to customise the output
 840                         if ( ContentHandler::runLegacyHooks( 'ShowRawCssJs', array( $this->mContentObject, $this->getTitle(), $outputPage ) ) ) {
 841                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 842                                 $outputPage->addHTML( $po->getText() );
 843                         }
 844                 }
 845         }
 846
 847         /**
 848          * Get the robot policy to be used for the current view
 849          * @param string $action the action= GET parameter
 850          * @param $pOutput ParserOutput|null
 851          * @return Array the policy that should be set
 852          * TODO: actions other than 'view'
 853          */
 854         public function getRobotPolicy( $action, $pOutput = null ) {
 855                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 856
 857                 $ns = $this->getTitle()->getNamespace();
 858
 859                 # Don't index user and user talk pages for blocked users (bug 11443)
 860                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 861                         $specificTarget = null;
 862                         $vagueTarget = null;
 863                         $titleText = $this->getTitle()->getText();
 864                         if ( IP::isValid( $titleText ) ) {
 865                                 $vagueTarget = $titleText;
 866                         } else {
 867                                 $specificTarget = $titleText;
 868                         }
 869                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 870                                 return array(
 871                                         'index' => 'noindex',
 872                                         'follow' => 'nofollow'
 873                                 );
 874                         }
 875                 }
 876
 877                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 878                         # Non-articles (special pages etc), and old revisions
 879                         return array(
 880                                 'index' => 'noindex',
 881                                 'follow' => 'nofollow'
 882                         );
 883                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 884                         # Discourage indexing of printable versions, but encourage following
 885                         return array(
 886                                 'index' => 'noindex',
 887                                 'follow' => 'follow'
 888                         );
 889                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 890                         # For ?curid=x urls, disallow indexing
 891                         return array(
 892                                 'index' => 'noindex',
 893                                 'follow' => 'follow'
 894                         );
 895                 }
 896
 897                 # Otherwise, construct the policy based on the various config variables.
 898                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 899
 900                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 901                         # Honour customised robot policies for this namespace
 902                         $policy = array_merge(
 903                                 $policy,
 904                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 905                         );
 906                 }
 907                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 908                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 909                         # a final sanity check that we have really got the parser output.
 910                         $policy = array_merge(
 911                                 $policy,
 912                                 array( 'index' => $pOutput->getIndexPolicy() )
 913                         );
 914                 }
 915
 916                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 917                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 918                         $policy = array_merge(
 919                                 $policy,
 920                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 921                         );
 922                 }
 923
 924                 return $policy;
 925         }
 926
 927         /**
 928          * Converts a String robot policy into an associative array, to allow
 929          * merging of several policies using array_merge().
 930          * @param $policy Mixed, returns empty array on null/false/'', transparent
 931          *            to already-converted arrays, converts String.
 932          * @return Array: 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 933          */
 934         public static function formatRobotPolicy( $policy ) {
 935                 if ( is_array( $policy ) ) {
 936                         return $policy;
 937                 } elseif ( !$policy ) {
 938                         return array();
 939                 }
 940
 941                 $policy = explode( ',', $policy );
 942                 $policy = array_map( 'trim', $policy );
 943
 944                 $arr = array();
 945                 foreach ( $policy as $var ) {
 946                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 947                                 $arr['index'] = $var;
 948                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 949                                 $arr['follow'] = $var;
 950                         }
 951                 }
 952
 953                 return $arr;
 954         }
 955
 956         /**
 957          * If this request is a redirect view, send "redirected from" subtitle to
 958          * the output. Returns true if the header was needed, false if this is not
 959          * a redirect view. Handles both local and remote redirects.
 960          *
 961          * @return boolean
 962          */
 963         public function showRedirectedFromHeader() {
 964                 global $wgRedirectSources;
 965                 $outputPage = $this->getContext()->getOutput();
 966
 967                 $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 968
 969                 if ( isset( $this->mRedirectedFrom ) ) {
 970                         // This is an internally redirected page view.
 971                         // We'll need a backlink to the source page for navigation.
 972                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 973                                 $redir = Linker::linkKnown(
 974                                         $this->mRedirectedFrom,
 975                                         null,
 976                                         array(),
 977                                         array( 'redirect' => 'no' )
 978                                 );
 979
 980                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 981
 982                                 // Set the fragment if one was specified in the redirect
 983                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 984                                         $outputPage->addInlineScript( Xml::encodeJsCall(
 985                                                 'redirectToFragment', array( $this->getTitle()->getFragmentForURL() )
 986                                         ) );
 987                                 }
 988
 989                                 // Add a <link rel="canonical"> tag
 990                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
 991
 992                                 // Tell the output object that the user arrived at this article through a redirect
 993                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 994
 995                                 return true;
 996                         }
 997                 } elseif ( $rdfrom ) {
 998                         // This is an externally redirected view, from some other wiki.
 999                         // If it was reported from a trusted site, supply a backlink.
1000                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1001                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1002                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
1003
1004                                 return true;
1005                         }
1006                 }
1007
1008                 return false;
1009         }
1010
1011         /**
1012          * Show a header specific to the namespace currently being viewed, like
1013          * [[MediaWiki:Talkpagetext]]. For Article::view().
1014          */
1015         public function showNamespaceHeader() {
1016                 if ( $this->getTitle()->isTalkPage() ) {
1017                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1018                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1019                         }
1020                 }
1021         }
1022
1023         /**
1024          * Show the footer section of an ordinary page view
1025          */
1026         public function showViewFooter() {
1027                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1028                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
1029                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1030                 }
1031
1032                 // Show a footer allowing the user to patrol the shown revision or page if possible
1033                 $patrolFooterShown = $this->showPatrolFooter();
1034
1035                 wfRunHooks( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
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          * Side effect: When the patrol link is build, this method will call
1044          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1045          *
1046          * @return bool
1047          */
1048         public function showPatrolFooter() {
1049                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1050
1051                 $outputPage = $this->getContext()->getOutput();
1052                 $user = $this->getContext()->getUser();
1053                 $cache = wfGetMainCache();
1054                 $rc = false;
1055
1056                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user ) || !( $wgUseRCPatrol || $wgUseNPPatrol ) ) {
1057                         // Patrolling is disabled or the user isn't allowed to
1058                         return false;
1059                 }
1060
1061                 wfProfileIn( __METHOD__ );
1062
1063                 // New page patrol: Get the timestamp of the oldest revison which
1064                 // the revision table holds for the given page. Then we look
1065                 // whether it's within the RC lifespan and if it is, we try
1066                 // to get the recentchanges row belonging to that entry
1067                 // (with rc_new = 1).
1068
1069                 // Check for cached results
1070                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1071                         wfProfileOut( __METHOD__ );
1072                         return false;
1073                 }
1074
1075                 if ( $this->mRevision && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 ) ) {
1076                         // The current revision is already older than what could be in the RC table
1077                         // 6h tolerance because the RC might not be cleaned out regularly
1078                         wfProfileOut( __METHOD__ );
1079                         return false;
1080                 }
1081
1082                 $dbr = wfGetDB( DB_SLAVE );
1083                 $oldestRevisionTimestamp = $dbr->selectField(
1084                         'revision',
1085                         'MIN( rev_timestamp )',
1086                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1087                         __METHOD__
1088                 );
1089
1090                 if ( $oldestRevisionTimestamp && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 ) ) {
1091                         // 6h tolerance because the RC might not be cleaned out regularly
1092                         $rc = RecentChange::newFromConds(
1093                                 array(
1094                                         'rc_new' => 1,
1095                                         'rc_timestamp' => $oldestRevisionTimestamp,
1096                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1097                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1098                                         'rc_patrolled' => 0
1099                                 ),
1100                                 __METHOD__,
1101                                 array( 'USE INDEX' => 'new_name_timestamp' )
1102                         );
1103                 }
1104
1105                 if ( !$rc ) {
1106                         // No RC entry around
1107
1108                         // Cache the information we gathered above in case we can't patrol
1109                         // Don't cache in case we can patrol as this could change
1110                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1111
1112                         wfProfileOut( __METHOD__ );
1113                         return false;
1114                 }
1115
1116                 if ( $rc->getPerformer()->getName() == $user->getName() ) {
1117                         // Don't show a patrol link for own creations. If the user could
1118                         // patrol them, they already would be patrolled
1119                         wfProfileOut( __METHOD__ );
1120                         return false;
1121                 }
1122
1123                 $rcid = $rc->getAttribute( 'rc_id' );
1124
1125                 $token = $user->getEditToken( $rcid );
1126
1127                 $outputPage->preventClickjacking();
1128                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1129                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1130                 }
1131
1132                 $link = Linker::linkKnown(
1133                         $this->getTitle(),
1134                         wfMessage( 'markaspatrolledtext' )->escaped(),
1135                         array(),
1136                         array(
1137                                 'action' => 'markpatrolled',
1138                                 'rcid' => $rcid,
1139                                 'token' => $token,
1140                         )
1141                 );
1142
1143                 $outputPage->addHTML(
1144                         "<div class='patrollink'>" .
1145                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1146                         '</div>'
1147                 );
1148
1149                 wfProfileOut( __METHOD__ );
1150                 return true;
1151         }
1152
1153         /**
1154          * Show the error text for a missing article. For articles in the MediaWiki
1155          * namespace, show the default message text. To be called from Article::view().
1156          */
1157         public function showMissingArticle() {
1158                 global $wgSend404Code;
1159                 $outputPage = $this->getContext()->getOutput();
1160                 // Whether the page is a root user page of an existing user (but not a subpage)
1161                 $validUserPage = false;
1162
1163                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1164                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
1165                         $parts = explode( '/', $this->getTitle()->getText() );
1166                         $rootPart = $parts[0];
1167                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1168                         $ip = User::isIP( $rootPart );
1169
1170                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1171                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1172                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1173                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1174                                 LogEventsList::showLogExtract(
1175                                         $outputPage,
1176                                         'block',
1177                                         $user->getUserPage(),
1178                                         '',
1179                                         array(
1180                                                 'lim' => 1,
1181                                                 'showIfEmpty' => false,
1182                                                 'msgKey' => array(
1183                                                         'blocked-notice-logextract',
1184                                                         $user->getName() # Support GENDER in notice
1185                                                 )
1186                                         )
1187                                 );
1188                                 $validUserPage = !$this->getTitle()->isSubpage();
1189                         } else {
1190                                 $validUserPage = !$this->getTitle()->isSubpage();
1191                         }
1192                 }
1193
1194                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1195
1196                 // Give extensions a chance to hide their (unrelated) log entries
1197                 $logTypes = array( 'delete', 'move' );
1198                 $conds = array( "log_action != 'revision'" );
1199                 wfRunHooks( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1200
1201                 # Show delete and move logs
1202                 LogEventsList::showLogExtract( $outputPage, $logTypes, $this->getTitle(), '',
1203                         array( 'lim' => 10,
1204                                 'conds' => $conds,
1205                                 'showIfEmpty' => false,
1206                                 'msgKey' => array( 'moveddeleted-notice' ) )
1207                 );
1208
1209                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1210                         // If there's no backing content, send a 404 Not Found
1211                         // for better machine handling of broken links.
1212                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1213                 }
1214
1215                 if ( $validUserPage ) {
1216                         // Also apply the robot policy for nonexisting user pages (as those aren't served as 404)
1217                         $policy = $this->getRobotPolicy( 'view' );
1218                         $outputPage->setIndexPolicy( $policy['index'] );
1219                         $outputPage->setFollowPolicy( $policy['follow'] );
1220                 }
1221
1222                 $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
1223
1224                 if ( ! $hookResult ) {
1225                         return;
1226                 }
1227
1228                 # Show error message
1229                 $oldid = $this->getOldID();
1230                 if ( $oldid ) {
1231                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1232                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
1233                         // Use the default message text
1234                         $text = $this->getTitle()->getDefaultMessageText();
1235                 } elseif ( $this->getTitle()->quickUserCan( 'create', $this->getContext()->getUser() )
1236                         && $this->getTitle()->quickUserCan( 'edit', $this->getContext()->getUser() )
1237                 ) {
1238                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1239                         $text = wfMessage( $message )->plain();
1240                 } else {
1241                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1242                 }
1243                 $text = "<div class='noarticletext'>\n$text\n</div>";
1244
1245                 $outputPage->addWikiText( $text );
1246         }
1247
1248         /**
1249          * If the revision requested for view is deleted, check permissions.
1250          * Send either an error message or a warning header to the output.
1251          *
1252          * @return boolean true if the view is allowed, false if not.
1253          */
1254         public function showDeletedRevisionHeader() {
1255                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1256                         // Not deleted
1257                         return true;
1258                 }
1259
1260                 $outputPage = $this->getContext()->getOutput();
1261                 $user = $this->getContext()->getUser();
1262                 // If the user is not allowed to see it...
1263                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1264                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1265                                 'rev-deleted-text-permission' );
1266
1267                         return false;
1268                 // If the user needs to confirm that they want to see it...
1269                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1270                         # Give explanation and add a link to view the revision...
1271                         $oldid = intval( $this->getOldID() );
1272                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1273                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1274                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1275                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1276                                 array( $msg, $link ) );
1277
1278                         return false;
1279                 // We are allowed to see...
1280                 } else {
1281                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1282                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1283                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1284
1285                         return true;
1286                 }
1287         }
1288
1289         /**
1290          * Generate the navigation links when browsing through an article revisions
1291          * It shows the information as:
1292          *   Revision as of \<date\>; view current revision
1293          *   \<- Previous version | Next Version -\>
1294          *
1295          * @param int $oldid revision ID of this article revision
1296          */
1297         public function setOldSubtitle( $oldid = 0 ) {
1298                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1299                         return;
1300                 }
1301
1302                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1303
1304                 # Cascade unhide param in links for easy deletion browsing
1305                 $extraParams = array();
1306                 if ( $unhide ) {
1307                         $extraParams['unhide'] = 1;
1308                 }
1309
1310                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1311                         $revision = $this->mRevision;
1312                 } else {
1313                         $revision = Revision::newFromId( $oldid );
1314                 }
1315
1316                 $timestamp = $revision->getTimestamp();
1317
1318                 $current = ( $oldid == $this->mPage->getLatest() );
1319                 $language = $this->getContext()->getLanguage();
1320                 $user = $this->getContext()->getUser();
1321
1322                 $td = $language->userTimeAndDate( $timestamp, $user );
1323                 $tddate = $language->userDate( $timestamp, $user );
1324                 $tdtime = $language->userTime( $timestamp, $user );
1325
1326                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1327                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1328
1329                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1330                         ? 'revision-info-current'
1331                         : 'revision-info';
1332
1333                 $outputPage = $this->getContext()->getOutput();
1334                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1335                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1336                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1337
1338                 $lnk = $current
1339                         ? wfMessage( 'currentrevisionlink' )->escaped()
1340                         : Linker::linkKnown(
1341                                 $this->getTitle(),
1342                                 wfMessage( 'currentrevisionlink' )->escaped(),
1343                                 array(),
1344                                 $extraParams
1345                         );
1346                 $curdiff = $current
1347                         ? wfMessage( 'diff' )->escaped()
1348                         : Linker::linkKnown(
1349                                 $this->getTitle(),
1350                                 wfMessage( 'diff' )->escaped(),
1351                                 array(),
1352                                 array(
1353                                         'diff' => 'cur',
1354                                         'oldid' => $oldid
1355                                 ) + $extraParams
1356                         );
1357                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1358                 $prevlink = $prev
1359                         ? Linker::linkKnown(
1360                                 $this->getTitle(),
1361                                 wfMessage( 'previousrevision' )->escaped(),
1362                                 array(),
1363                                 array(
1364                                         'direction' => 'prev',
1365                                         'oldid' => $oldid
1366                                 ) + $extraParams
1367                         )
1368                         : wfMessage( 'previousrevision' )->escaped();
1369                 $prevdiff = $prev
1370                         ? Linker::linkKnown(
1371                                 $this->getTitle(),
1372                                 wfMessage( 'diff' )->escaped(),
1373                                 array(),
1374                                 array(
1375                                         'diff' => 'prev',
1376                                         'oldid' => $oldid
1377                                 ) + $extraParams
1378                         )
1379                         : wfMessage( 'diff' )->escaped();
1380                 $nextlink = $current
1381                         ? wfMessage( 'nextrevision' )->escaped()
1382                         : Linker::linkKnown(
1383                                 $this->getTitle(),
1384                                 wfMessage( 'nextrevision' )->escaped(),
1385                                 array(),
1386                                 array(
1387                                         'direction' => 'next',
1388                                         'oldid' => $oldid
1389                                 ) + $extraParams
1390                         );
1391                 $nextdiff = $current
1392                         ? wfMessage( 'diff' )->escaped()
1393                         : Linker::linkKnown(
1394                                 $this->getTitle(),
1395                                 wfMessage( 'diff' )->escaped(),
1396                                 array(),
1397                                 array(
1398                                         'diff' => 'next',
1399                                         'oldid' => $oldid
1400                                 ) + $extraParams
1401                         );
1402
1403                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1404                 if ( $cdel !== '' ) {
1405                         $cdel .= ' ';
1406                 }
1407
1408                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1409                         wfMessage( 'revision-nav' )->rawParams(
1410                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1411                         )->escaped() . "</div>" );
1412         }
1413
1414         /**
1415          * Return the HTML for the top of a redirect page
1416          *
1417          * Chances are you should just be using the ParserOutput from
1418          * WikitextContent::getParserOutput instead of calling this for redirects.
1419          *
1420          * @param $target Title|Array of destination(s) to redirect
1421          * @param $appendSubtitle Boolean [optional]
1422          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1423          * @return string containing HMTL with redirect link
1424          */
1425         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1426                 $lang = $this->getTitle()->getPageLanguage();
1427                 if ( $appendSubtitle ) {
1428                         $out = $this->getContext()->getOutput();
1429                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
1430                 }
1431                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1432         }
1433
1434         /**
1435          * Return the HTML for the top of a redirect page
1436          *
1437          * Chances are you should just be using the ParserOutput from
1438          * WikitextContent::getParserOutput instead of calling this for redirects.
1439          *
1440          * @since 1.23
1441          * @param Language $lang
1442          * @param Title|array $target destination(s) to redirect
1443          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1444          * @return string containing HMTL with redirect link
1445          */
1446         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1447                 global $wgStylePath;
1448
1449                 if ( !is_array( $target ) ) {
1450                         $target = array( $target );
1451                 }
1452
1453                 $imageDir = $lang->getDir();
1454
1455                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1456
1457                 /**
1458                  * @var $title Title
1459                  */
1460                 $title = array_shift( $target );
1461
1462                 if ( $forceKnown ) {
1463                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1464                 } else {
1465                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1466                 }
1467
1468                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1469                 $alt = $lang->isRTL() ? '←' : '→';
1470                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1471                 foreach ( $target as $rt ) {
1472                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1473                         if ( $forceKnown ) {
1474                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1475                         } else {
1476                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1477                         }
1478                 }
1479
1480                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1481                 return '<div class="redirectMsg">' .
1482                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1483                         '<span class="redirectText">' . $link . '</span></div>';
1484         }
1485
1486         /**
1487          * Handle action=render
1488          */
1489         public function render() {
1490                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1491                 $this->view();
1492         }
1493
1494         /**
1495          * action=protect handler
1496          */
1497         public function protect() {
1498                 $form = new ProtectionForm( $this );
1499                 $form->execute();
1500         }
1501
1502         /**
1503          * action=unprotect handler (alias)
1504          */
1505         public function unprotect() {
1506                 $this->protect();
1507         }
1508
1509         /**
1510          * UI entry point for page deletion
1511          */
1512         public function delete() {
1513                 # This code desperately needs to be totally rewritten
1514
1515                 $title = $this->getTitle();
1516                 $user = $this->getContext()->getUser();
1517
1518                 # Check permissions
1519                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1520                 if ( count( $permission_errors ) ) {
1521                         throw new PermissionsError( 'delete', $permission_errors );
1522                 }
1523
1524                 # Read-only check...
1525                 if ( wfReadOnly() ) {
1526                         throw new ReadOnlyError;
1527                 }
1528
1529                 # Better double-check that it hasn't been deleted yet!
1530                 $this->mPage->loadPageData( 'fromdbmaster' );
1531                 if ( !$this->mPage->exists() ) {
1532                         $deleteLogPage = new LogPage( 'delete' );
1533                         $outputPage = $this->getContext()->getOutput();
1534                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1535                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1536                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1537                                 );
1538                         $outputPage->addHTML(
1539                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1540                         );
1541                         LogEventsList::showLogExtract(
1542                                 $outputPage,
1543                                 'delete',
1544                                 $title
1545                         );
1546
1547                         return;
1548                 }
1549
1550                 $request = $this->getContext()->getRequest();
1551                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1552                 $deleteReason = $request->getText( 'wpReason' );
1553
1554                 if ( $deleteReasonList == 'other' ) {
1555                         $reason = $deleteReason;
1556                 } elseif ( $deleteReason != '' ) {
1557                         // Entry from drop down menu + additional comment
1558                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1559                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1560                 } else {
1561                         $reason = $deleteReasonList;
1562                 }
1563
1564                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1565                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1566                 ) {
1567                         # Flag to hide all contents of the archived revisions
1568                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1569
1570                         $this->doDelete( $reason, $suppress );
1571
1572                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1573
1574                         return;
1575                 }
1576
1577                 // Generate deletion reason
1578                 $hasHistory = false;
1579                 if ( !$reason ) {
1580                         try {
1581                                 $reason = $this->generateReason( $hasHistory );
1582                         } catch ( MWException $e ) {
1583                                 # if a page is horribly broken, we still want to be able to delete it. so be lenient about errors here.
1584                                 wfDebug( "Error while building auto delete summary: $e" );
1585                                 $reason = '';
1586                         }
1587                 }
1588
1589                 // If the page has a history, insert a warning
1590                 if ( $hasHistory ) {
1591                         $revisions = $this->mTitle->estimateRevisionCount();
1592                         // @todo FIXME: i18n issue/patchwork message
1593                         $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
1594                                 wfMessage( 'historywarning' )->numParams( $revisions )->parse() .
1595                                 wfMessage( 'word-separator' )->plain() . Linker::linkKnown( $title,
1596                                         wfMessage( 'history' )->escaped(),
1597                                         array( 'rel' => 'archives' ),
1598                                         array( 'action' => 'history' ) ) .
1599                                 '</strong>'
1600                         );
1601
1602                         if ( $this->mTitle->isBigDeletion() ) {
1603                                 global $wgDeleteRevisionsLimit;
1604                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1605                                         array( 'delete-warning-toobig', $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit ) ) );
1606                         }
1607                 }
1608
1609                 $this->confirmDelete( $reason );
1610         }
1611
1612         /**
1613          * Output deletion confirmation dialog
1614          * @todo FIXME: Move to another file?
1615          * @param string $reason prefilled reason
1616          */
1617         public function confirmDelete( $reason ) {
1618                 wfDebug( "Article::confirmDelete\n" );
1619
1620                 $outputPage = $this->getContext()->getOutput();
1621                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1622                 $outputPage->addBacklinkSubtitle( $this->getTitle() );
1623                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1624                 if ( $this->getTitle()->getBacklinkCache()->hasLinks( 'pagelinks' ) ) {
1625                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1626                                 'deleting-backlinks-warning' );
1627                 }
1628                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1629
1630                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1631
1632                 $user = $this->getContext()->getUser();
1633
1634                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1635                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1636                                         <td></td>
1637                                         <td class='mw-input'><strong>" .
1638                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1639                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1640                                         "</strong></td>
1641                                 </tr>";
1642                 } else {
1643                         $suppress = '';
1644                 }
1645                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $this->getTitle() );
1646
1647                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1648                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1649                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1650                         Xml::tags( 'legend', null, wfMessage( 'delete-legend' )->escaped() ) .
1651                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1652                         "<tr id=\"wpDeleteReasonListRow\">
1653                                 <td class='mw-label'>" .
1654                                         Xml::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1655                                 "</td>
1656                                 <td class='mw-input'>" .
1657                                         Xml::listDropDown( 'wpDeleteReasonList',
1658                                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1659                                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(), '', 'wpReasonDropDown', 1 ) .
1660                                 "</td>
1661                         </tr>
1662                         <tr id=\"wpDeleteReasonRow\">
1663                                 <td class='mw-label'>" .
1664                                         Xml::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1665                                 "</td>
1666                                 <td class='mw-input'>" .
1667                                 Html::input( 'wpReason', $reason, 'text', array(
1668                                         'size' => '60',
1669                                         'maxlength' => '255',
1670                                         'tabindex' => '2',
1671                                         'id' => 'wpReason',
1672                                         'autofocus'
1673                                 ) ) .
1674                                 "</td>
1675                         </tr>";
1676
1677                 # Disallow watching if user is not logged in
1678                 if ( $user->isLoggedIn() ) {
1679                         $form .= "
1680                         <tr>
1681                                 <td></td>
1682                                 <td class='mw-input'>" .
1683                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1684                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1685                                 "</td>
1686                         </tr>";
1687                 }
1688
1689                 $form .= "
1690                         $suppress
1691                         <tr>
1692                                 <td></td>
1693                                 <td class='mw-submit'>" .
1694                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1695                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1696                                 "</td>
1697                         </tr>" .
1698                         Xml::closeElement( 'table' ) .
1699                         Xml::closeElement( 'fieldset' ) .
1700                         Html::hidden( 'wpEditToken', $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1701                         Xml::closeElement( 'form' );
1702
1703                         if ( $user->isAllowed( 'editinterface' ) ) {
1704                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1705                                 $link = Linker::link(
1706                                         $title,
1707                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1708                                         array(),
1709                                         array( 'action' => 'edit' )
1710                                 );
1711                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1712                         }
1713
1714                 $outputPage->addHTML( $form );
1715
1716                 $deleteLogPage = new LogPage( 'delete' );
1717                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1718                 LogEventsList::showLogExtract( $outputPage, 'delete',
1719                         $this->getTitle()
1720                 );
1721         }
1722
1723         /**
1724          * Perform a deletion and output success or failure messages
1725          * @param $reason
1726          * @param $suppress bool
1727          */
1728         public function doDelete( $reason, $suppress = false ) {
1729                 $error = '';
1730                 $outputPage = $this->getContext()->getOutput();
1731                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1732                 if ( $status->isGood() ) {
1733                         $deleted = $this->getTitle()->getPrefixedText();
1734
1735                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1736                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1737
1738                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1739
1740                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1741                         $outputPage->returnToMain( false );
1742                 } else {
1743                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1744                         if ( $error == '' ) {
1745                                 $outputPage->addWikiText(
1746                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1747                                 );
1748                                 $deleteLogPage = new LogPage( 'delete' );
1749                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1750
1751                                 LogEventsList::showLogExtract(
1752                                         $outputPage,
1753                                         'delete',
1754                                         $this->getTitle()
1755                                 );
1756                         } else {
1757                                 $outputPage->addHTML( $error );
1758                         }
1759                 }
1760         }
1761
1762         /* Caching functions */
1763
1764         /**
1765          * checkLastModified returns true if it has taken care of all
1766          * output to the client that is necessary for this request.
1767          * (that is, it has sent a cached version of the page)
1768          *
1769          * @return boolean true if cached version send, false otherwise
1770          */
1771         protected function tryFileCache() {
1772                 static $called = false;
1773
1774                 if ( $called ) {
1775                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1776                         return false;
1777                 }
1778
1779                 $called = true;
1780                 if ( $this->isFileCacheable() ) {
1781                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1782                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1783                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1784                                 $cache->loadFromFileCache( $this->getContext() );
1785                                 return true;
1786                         } else {
1787                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1788                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1789                         }
1790                 } else {
1791                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1792                 }
1793
1794                 return false;
1795         }
1796
1797         /**
1798          * Check if the page can be cached
1799          * @return bool
1800          */
1801         public function isFileCacheable() {
1802                 $cacheable = false;
1803
1804                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1805                         $cacheable = $this->mPage->getID()
1806                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1807                         // Extension may have reason to disable file caching on some pages.
1808                         if ( $cacheable ) {
1809                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1810                         }
1811                 }
1812
1813                 return $cacheable;
1814         }
1815
1816         /**#@-*/
1817
1818         /**
1819          * Lightweight method to get the parser output for a page, checking the parser cache
1820          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1821          * consider, so it's not appropriate to use there.
1822          *
1823          * @since 1.16 (r52326) for LiquidThreads
1824          *
1825          * @param $oldid mixed integer Revision ID or null
1826          * @param $user User The relevant user
1827          * @return ParserOutput or false if the given revision ID is not found
1828          */
1829         public function getParserOutput( $oldid = null, User $user = null ) {
1830                 //XXX: bypasses mParserOptions and thus setParserOptions()
1831
1832                 if ( $user === null ) {
1833                         $parserOptions = $this->getParserOptions();
1834                 } else {
1835                         $parserOptions = $this->mPage->makeParserOptions( $user );
1836                 }
1837
1838                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1839         }
1840
1841         /**
1842          * Override the ParserOptions used to render the primary article wikitext.
1843          *
1844          * @param ParserOptions $options
1845          * @throws MWException if the parser options where already initialized.
1846          */
1847         public function setParserOptions( ParserOptions $options ) {
1848                 if ( $this->mParserOptions ) {
1849                         throw new MWException( "can't change parser options after they have already been set" );
1850                 }
1851
1852                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1853                 $this->mParserOptions = clone $options;
1854         }
1855
1856         /**
1857          * Get parser options suitable for rendering the primary article wikitext
1858          * @return ParserOptions
1859          */
1860         public function getParserOptions() {
1861                 if ( !$this->mParserOptions ) {
1862                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1863                 }
1864                 // Clone to allow modifications of the return value without affecting cache
1865                 return clone $this->mParserOptions;
1866         }
1867
1868         /**
1869          * Sets the context this Article is executed in
1870          *
1871          * @param $context IContextSource
1872          * @since 1.18
1873          */
1874         public function setContext( $context ) {
1875                 $this->mContext = $context;
1876         }
1877
1878         /**
1879          * Gets the context this Article is executed in
1880          *
1881          * @return IContextSource
1882          * @since 1.18
1883          */
1884         public function getContext() {
1885                 if ( $this->mContext instanceof IContextSource ) {
1886                         return $this->mContext;
1887                 } else {
1888                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1889                         return RequestContext::getMain();
1890                 }
1891         }
1892
1893         /**
1894          * Info about this page
1895          * @deprecated since 1.19
1896          */
1897         public function info() {
1898                 wfDeprecated( __METHOD__, '1.19' );
1899                 Action::factory( 'info', $this )->show();
1900         }
1901
1902         /**
1903          * Mark this particular edit/page as patrolled
1904          * @deprecated since 1.18
1905          */
1906         public function markpatrolled() {
1907                 wfDeprecated( __METHOD__, '1.18' );
1908                 Action::factory( 'markpatrolled', $this )->show();
1909         }
1910
1911         /**
1912          * Handle action=purge
1913          * @deprecated since 1.19
1914          * @return Action|bool|null false if the action is disabled, null if it is not recognised
1915          */
1916         public function purge() {
1917                 return Action::factory( 'purge', $this )->show();
1918         }
1919
1920         /**
1921          * Handle action=revert
1922          * @deprecated since 1.19
1923          */
1924         public function revert() {
1925                 wfDeprecated( __METHOD__, '1.19' );
1926                 Action::factory( 'revert', $this )->show();
1927         }
1928
1929         /**
1930          * Handle action=rollback
1931          * @deprecated since 1.19
1932          */
1933         public function rollback() {
1934                 wfDeprecated( __METHOD__, '1.19' );
1935                 Action::factory( 'rollback', $this )->show();
1936         }
1937
1938         /**
1939          * User-interface handler for the "watch" action.
1940          * Requires Request to pass a token as of 1.18.
1941          * @deprecated since 1.18
1942          */
1943         public function watch() {
1944                 wfDeprecated( __METHOD__, '1.18' );
1945                 Action::factory( 'watch', $this )->show();
1946         }
1947
1948         /**
1949          * Add this page to the current user's watchlist
1950          *
1951          * This is safe to be called multiple times
1952          *
1953          * @return bool true on successful watch operation
1954          * @deprecated since 1.18
1955          */
1956         public function doWatch() {
1957                 wfDeprecated( __METHOD__, '1.18' );
1958                 return WatchAction::doWatch( $this->getTitle(), $this->getContext()->getUser() );
1959         }
1960
1961         /**
1962          * User interface handler for the "unwatch" action.
1963          * Requires Request to pass a token as of 1.18.
1964          * @deprecated since 1.18
1965          */
1966         public function unwatch() {
1967                 wfDeprecated( __METHOD__, '1.18' );
1968                 Action::factory( 'unwatch', $this )->show();
1969         }
1970
1971         /**
1972          * Stop watching a page
1973          * @return bool true on successful unwatch
1974          * @deprecated since 1.18
1975          */
1976         public function doUnwatch() {
1977                 wfDeprecated( __METHOD__, '1.18' );
1978                 return WatchAction::doUnwatch( $this->getTitle(), $this->getContext()->getUser() );
1979         }
1980
1981         /**
1982          * Output a redirect back to the article.
1983          * This is typically used after an edit.
1984          *
1985          * @deprecated in 1.18; call OutputPage::redirect() directly
1986          * @param $noRedir Boolean: add redirect=no
1987          * @param string $sectionAnchor section to redirect to, including "#"
1988          * @param string $extraQuery extra query params
1989          */
1990         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1991                 wfDeprecated( __METHOD__, '1.18' );
1992                 if ( $noRedir ) {
1993                         $query = 'redirect=no';
1994                         if ( $extraQuery ) {
1995                                 $query .= "&$extraQuery";
1996                         }
1997                 } else {
1998                         $query = $extraQuery;
1999                 }
2000
2001                 $this->getContext()->getOutput()->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
2002         }
2003
2004         /**
2005          * Use PHP's magic __get handler to handle accessing of
2006          * raw WikiPage fields for backwards compatibility.
2007          *
2008          * @param string $fname Field name
2009          */
2010         public function __get( $fname ) {
2011                 if ( property_exists( $this->mPage, $fname ) ) {
2012                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
2013                         return $this->mPage->$fname;
2014                 }
2015                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2016         }
2017
2018         /**
2019          * Use PHP's magic __set handler to handle setting of
2020          * raw WikiPage fields for backwards compatibility.
2021          *
2022          * @param string $fname Field name
2023          * @param $fvalue mixed New value
2024          */
2025         public function __set( $fname, $fvalue ) {
2026                 if ( property_exists( $this->mPage, $fname ) ) {
2027                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
2028                         $this->mPage->$fname = $fvalue;
2029                 // Note: extensions may want to toss on new fields
2030                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
2031                         $this->mPage->$fname = $fvalue;
2032                 } else {
2033                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2034                 }
2035         }
2036
2037         /**
2038          * Use PHP's magic __call handler to transform instance calls to
2039          * WikiPage functions for backwards compatibility.
2040          *
2041          * @param string $fname Name of called method
2042          * @param array $args Arguments to the method
2043          * @return mixed
2044          */
2045         public function __call( $fname, $args ) {
2046                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2047                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2048                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2049                 }
2050                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2051         }
2052
2053         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2054
2055         /**
2056          * @param $limit array
2057          * @param $expiry array
2058          * @param $cascade bool
2059          * @param $reason string
2060          * @param $user User
2061          * @return Status
2062          */
2063         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2064                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2065         }
2066
2067         /**
2068          * @param $limit array
2069          * @param $reason string
2070          * @param $cascade int
2071          * @param $expiry array
2072          * @return bool
2073          */
2074         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2075                 return $this->mPage->doUpdateRestrictions(
2076                         $limit,
2077                         $expiry,
2078                         $cascade,
2079                         $reason,
2080                         $this->getContext()->getUser()
2081                 );
2082         }
2083
2084         /**
2085          * @param $reason string
2086          * @param $suppress bool
2087          * @param $id int
2088          * @param $commit bool
2089          * @param $error string
2090          * @return bool
2091          */
2092         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2093                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2094         }
2095
2096         /**
2097          * @param $fromP
2098          * @param $summary
2099          * @param $token
2100          * @param $bot
2101          * @param $resultDetails
2102          * @param $user User
2103          * @return array
2104          */
2105         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2106                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2107                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2108         }
2109
2110         /**
2111          * @param $fromP
2112          * @param $summary
2113          * @param $bot
2114          * @param $resultDetails
2115          * @param $guser User
2116          * @return array
2117          */
2118         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2119                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2120                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2121         }
2122
2123         /**
2124          * @param $hasHistory bool
2125          * @return mixed
2126          */
2127         public function generateReason( &$hasHistory ) {
2128                 $title = $this->mPage->getTitle();
2129                 $handler = ContentHandler::getForTitle( $title );
2130                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2131         }
2132
2133         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2134
2135         /**
2136          * @return array
2137          */
2138         public static function selectFields() {
2139                 return WikiPage::selectFields();
2140         }
2141
2142         /**
2143          * @param $title Title
2144          */
2145         public static function onArticleCreate( $title ) {
2146                 WikiPage::onArticleCreate( $title );
2147         }
2148
2149         /**
2150          * @param $title Title
2151          */
2152         public static function onArticleDelete( $title ) {
2153                 WikiPage::onArticleDelete( $title );
2154         }
2155
2156         /**
2157          * @param $title Title
2158          */
2159         public static function onArticleEdit( $title ) {
2160                 WikiPage::onArticleEdit( $title );
2161         }
2162
2163         /**
2164          * @param $oldtext
2165          * @param $newtext
2166          * @param $flags
2167          * @return string
2168          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2169          */
2170         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2171                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2172         }
2173         // ******
2174 }