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