includes/Wiki.php

   1 <?php
   2 /**
   3  * Helper class for the index.php entry point.
   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  * The MediaWiki class is the helper class for the index.php entry point.
  25  *
  26  * @internal documentation reviewed 15 Mar 2010
  27  */
  28 class MediaWiki {
  29
  30         /**
  31          * TODO: fold $output, etc, into this
  32          * @var IContextSource
  33          */
  34         private $context;
  35
  36         /**
  37          * @var string
  38          */
  39         private $performedAction = 'nosuchaction';
  40
  41         public function request( WebRequest $x = null ) {
  42                 $old = $this->context->getRequest();
  43                 $this->context->setRequest( $x );
  44                 return $old;
  45         }
  46
  47         public function output( OutputPage $x = null ) {
  48                 $old = $this->context->getOutput();
  49                 $this->context->setOutput( $x );
  50                 return $old;
  51         }
  52
  53         public function __construct( IContextSource $context = null ) {
  54                 if ( !$context ) {
  55                         $context = RequestContext::getMain();
  56                 }
  57
  58                 $this->context = $context;
  59                 $this->context->setTitle( $this->parseTitle() );
  60         }
  61
  62         /**
  63          * Parse the request to get the Title object
  64          *
  65          * @return Title object to be $wgTitle
  66          */
  67         private function parseTitle() {
  68                 global $wgContLang;
  69
  70                 $request = $this->context->getRequest();
  71                 $curid = $request->getInt( 'curid' );
  72                 $title = $request->getVal( 'title' );
  73
  74                 if ( $request->getCheck( 'search' ) ) {
  75                         // Compatibility with old search URLs which didn't use Special:Search
  76                         // Just check for presence here, so blank requests still
  77                         // show the search page when using ugly URLs (bug 8054).
  78                         $ret = SpecialPage::getTitleFor( 'Search' );
  79                 } elseif ( $curid ) {
  80                         // URLs like this are generated by RC, because rc_title isn't always accurate
  81                         $ret = Title::newFromID( $curid );
  82                 } elseif ( $title == '' && $this->getAction() != 'delete' ) {
  83                         $ret = Title::newMainPage();
  84                 } else {
  85                         $ret = Title::newFromURL( $title );
  86                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  87                         // in wikitext links to tell Parser to make a direct file link
  88                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  89                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  90                         }
  91                         // Check variant links so that interwiki links don't have to worry
  92                         // about the possible different language variants
  93                         if ( count( $wgContLang->getVariants() ) > 1
  94                                 && !is_null( $ret ) && $ret->getArticleID() == 0 )
  95                         {
  96                                 $wgContLang->findVariantLink( $title, $ret );
  97                         }
  98                 }
  99                 // For non-special titles, check for implicit titles
 100                 if ( is_null( $ret ) || !$ret->isSpecialPage() ) {
 101                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 102                         $oldid = $request->getInt( 'oldid' );
 103                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 104                         // Allow oldid to override a changed or missing title
 105                         if ( $oldid ) {
 106                                 $rev = Revision::newFromId( $oldid );
 107                                 $ret = $rev ? $rev->getTitle() : $ret;
 108                         }
 109                 }
 110
 111                 if ( $ret === null || ( $ret->getDBkey() == '' && $ret->getInterwiki() == '' ) ) {
 112                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 113                 }
 114
 115                 return $ret;
 116         }
 117
 118         /**
 119          * Get the Title object that we'll be acting on, as specified in the WebRequest
 120          * @return Title
 121          */
 122         public function getTitle() {
 123                 if( $this->context->getTitle() === null ){
 124                         $this->context->setTitle( $this->parseTitle() );
 125                 }
 126                 return $this->context->getTitle();
 127         }
 128
 129         /**
 130          * Performs the request.
 131          * - bad titles
 132          * - read restriction
 133          * - local interwiki redirects
 134          * - redirect loop
 135          * - special pages
 136          * - normal pages
 137          *
 138          * @return void
 139          */
 140         private function performRequest() {
 141                 global $wgServer, $wgUsePathInfo, $wgTitle;
 142
 143                 wfProfileIn( __METHOD__ );
 144
 145                 $request = $this->context->getRequest();
 146                 $title = $this->context->getTitle();
 147                 $output = $this->context->getOutput();
 148                 $user = $this->context->getUser();
 149
 150                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 151                         $output->setPrintable();
 152                 }
 153
 154                 $unused = null; // To pass it by reference
 155                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 156
 157                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 158                 if ( is_null( $title ) || ( $title->getDBkey() == '' && $title->getInterwiki() == '' ) ||
 159                         $title->isSpecial( 'Badtitle' ) )
 160                 {
 161                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 162                         wfProfileOut( __METHOD__ );
 163                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 164                 }
 165
 166                 // Check user's permissions to read this page.
 167                 // We have to check here to catch special pages etc.
 168                 // We will check again in Article::view().
 169                 $permErrors = $title->getUserPermissionsErrors( 'read', $user );
 170                 if ( count( $permErrors ) ) {
 171                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 172                         // $this->context->title set to the input title would allow anonymous users to
 173                         // determine whether a page exists, potentially leaking private data. In fact, the
 174                         // curid and oldid request  parameters would allow page titles to be enumerated even
 175                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 176                         // permissions error is displayed.
 177                         //
 178                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 179                         // still use $wgTitle.
 180
 181                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 182                         $this->context->setTitle( $badTitle );
 183                         $wgTitle = $badTitle;
 184
 185                         wfProfileOut( __METHOD__ );
 186                         throw new PermissionsError( 'read', $permErrors );
 187                 }
 188
 189                 $pageView = false; // was an article or special page viewed?
 190
 191                 // Interwiki redirects
 192                 if ( $title->getInterwiki() != '' ) {
 193                         $rdfrom = $request->getVal( 'rdfrom' );
 194                         if ( $rdfrom ) {
 195                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 196                         } else {
 197                                 $query = $request->getValues();
 198                                 unset( $query['title'] );
 199                                 $url = $title->getFullURL( $query );
 200                         }
 201                         // Check for a redirect loop
 202                         if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url )
 203                                 && $title->isLocal() )
 204                         {
 205                                 // 301 so google et al report the target as the actual url.
 206                                 $output->redirect( $url, 301 );
 207                         } else {
 208                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 209                                 wfProfileOut( __METHOD__ );
 210                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 211                         }
 212                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 213                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 214                         && ( $request->getVal( 'title' ) === null ||
 215                                 $title->getPrefixedDBKey() != $request->getVal( 'title' ) )
 216                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 217                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) ) )
 218                 {
 219                         if ( $title->isSpecialPage() ) {
 220                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 221                                 if ( $name ) {
 222                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 223                                 }
 224                         }
 225                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 226                         // Redirect to canonical url, make it a 301 to allow caching
 227                         if ( $targetUrl == $request->getFullRequestURL() ) {
 228                                 $message = "Redirect loop detected!\n\n" .
 229                                         "This means the wiki got confused about what page was " .
 230                                         "requested; this sometimes happens when moving a wiki " .
 231                                         "to a new server or changing the server configuration.\n\n";
 232
 233                                 if ( $wgUsePathInfo ) {
 234                                         $message .= "The wiki is trying to interpret the page " .
 235                                                 "title from the URL path portion (PATH_INFO), which " .
 236                                                 "sometimes fails depending on the web server. Try " .
 237                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 238                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 239                                                 "is correct.";
 240                                 } else {
 241                                         $message .= "Your web server was detected as possibly not " .
 242                                                 "supporting URL path components (PATH_INFO) correctly; " .
 243                                                 "check your LocalSettings.php for a customized " .
 244                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 245                                                 "to true.";
 246                                 }
 247                                 throw new HttpError( 500, $message );
 248                         } else {
 249                                 $output->setSquidMaxage( 1200 );
 250                                 $output->redirect( $targetUrl, '301' );
 251                         }
 252                 // Special pages
 253                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 254                         $pageView = true;
 255                         // Actions that need to be made when we have a special pages
 256                         SpecialPageFactory::executePath( $title, $this->context );
 257                 } else {
 258                         // ...otherwise treat it as an article view. The article
 259                         // may be a redirect to another article or URL.
 260                         $article = $this->initializeArticle();
 261                         if ( is_object( $article ) ) {
 262                                 $pageView = true;
 263                                 /**
 264                                  * $wgArticle is deprecated, do not use it.
 265                                  * This will be removed entirely in 1.20.
 266                                  * @deprecated since 1.18
 267                                  */
 268                                 global $wgArticle;
 269                                 $wgArticle = $article;
 270
 271                                 $this->performAction( $article );
 272                         } elseif ( is_string( $article ) ) {
 273                                 $output->redirect( $article );
 274                         } else {
 275                                 wfProfileOut( __METHOD__ );
 276                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
 277                         }
 278                 }
 279
 280                 if ( $pageView ) {
 281                         // Promote user to any groups they meet the criteria for
 282                         $user->addAutopromoteOnceGroups( 'onView' );
 283                 }
 284
 285                 wfProfileOut( __METHOD__ );
 286         }
 287
 288         /**
 289          * Create an Article object of the appropriate class for the given page.
 290          *
 291          * @deprecated in 1.18; use Article::newFromTitle() instead
 292          * @param $title Title
 293          * @param $context IContextSource
 294          * @return Article object
 295          */
 296         public static function articleFromTitle( $title, IContextSource $context ) {
 297                 wfDeprecated( __METHOD__, '1.18' );
 298                 return Article::newFromTitle( $title, $context );
 299         }
 300
 301         /**
 302          * Returns the action that will be executed, not necessarily the one passed
 303          * passed through the "action" parameter. Actions disabled in
 304          * $wgDisabledActions will be replaced by "nosuchaction".
 305          *
 306          * The return value is merely a suggestion, not the actually performed action,
 307          * which may be different. The actually performed action is determined by performAction().
 308          * Requests like action=nonsense will make this function return "nonsense".
 309          * Use getPerformedAction() to get the performed action.
 310          *
 311          * @return string: action
 312          */
 313         public function getAction() {
 314                 global $wgDisabledActions;
 315
 316                 $request = $this->context->getRequest();
 317                 $action = $request->getVal( 'action', 'view' );
 318
 319                 // Check for disabled actions
 320                 if ( in_array( $action, $wgDisabledActions ) ) {
 321                         return 'nosuchaction';
 322                 }
 323
 324                 // Workaround for bug #20966: inability of IE to provide an action dependent
 325                 // on which submit button is clicked.
 326                 if ( $action === 'historysubmit' ) {
 327                         if ( $request->getBool( 'revisiondelete' ) ) {
 328                                 return 'revisiondelete';
 329                         } else {
 330                                 return 'view';
 331                         }
 332                 } elseif ( $action == 'editredlink' ) {
 333                         return 'edit';
 334                 }
 335
 336                 return $action;
 337         }
 338
 339         /**
 340          * Initialize the main Article object for "standard" actions (view, etc)
 341          * Create an Article object for the page, following redirects if needed.
 342          *
 343          * @return mixed an Article, or a string to redirect to another URL
 344          */
 345         private function initializeArticle() {
 346                 global $wgDisableHardRedirects;
 347
 348                 wfProfileIn( __METHOD__ );
 349
 350                 $title = $this->context->getTitle();
 351                 $article = Article::newFromTitle( $title, $this->context );
 352                 $this->context->setWikiPage( $article->getPage() );
 353                 // NS_MEDIAWIKI has no redirects.
 354                 // It is also used for CSS/JS, so performance matters here...
 355                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 356                         wfProfileOut( __METHOD__ );
 357                         return $article;
 358                 }
 359
 360                 $request = $this->context->getRequest();
 361
 362                 // Namespace might change when using redirects
 363                 // Check for redirects ...
 364                 $action = $request->getVal( 'action', 'view' );
 365                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 366                 if ( ( $action == 'view' || $action == 'render' )       // ... for actions that show content
 367                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 368                         !$request->getVal( 'diff' ) &&    // ... and not when showing diff
 369                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 370                         // ... and the article is not a non-redirect image page with associated file
 371                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 372                 {
 373                         // Give extensions a change to ignore/handle redirects as needed
 374                         $ignoreRedirect = $target = false;
 375
 376                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 377                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 378
 379                         // Follow redirects only for... redirects.
 380                         // If $target is set, then a hook wanted to redirect.
 381                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 382                                 // Is the target already set by an extension?
 383                                 $target = $target ? $target : $article->followRedirect();
 384                                 if ( is_string( $target ) ) {
 385                                         if ( !$wgDisableHardRedirects ) {
 386                                                 // we'll need to redirect
 387                                                 wfProfileOut( __METHOD__ );
 388                                                 return $target;
 389                                         }
 390                                 }
 391                                 if ( is_object( $target ) ) {
 392                                         // Rewrite environment to redirected article
 393                                         $rarticle = Article::newFromTitle( $target, $this->context );
 394                                         $rarticle->loadPageData();
 395                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 396                                                 $rarticle->setRedirectedFrom( $title );
 397                                                 $article = $rarticle;
 398                                                 $this->context->setTitle( $target );
 399                                                 $this->context->setWikiPage( $article->getPage() );
 400                                         }
 401                                 }
 402                         } else {
 403                                 $this->context->setTitle( $article->getTitle() );
 404                                 $this->context->setWikiPage( $article->getPage() );
 405                         }
 406                 }
 407
 408                 wfProfileOut( __METHOD__ );
 409                 return $article;
 410         }
 411
 412         /**
 413          * Cleaning up request by doing deferred updates, DB transaction, and the output
 414          */
 415         public function finalCleanup() {
 416                 wfProfileIn( __METHOD__ );
 417                 // Now commit any transactions, so that unreported errors after
 418                 // output() don't roll back the whole DB transaction
 419                 $factory = wfGetLBFactory();
 420                 $factory->commitMasterChanges();
 421                 // Output everything!
 422                 $this->context->getOutput()->output();
 423                 // Do any deferred jobs
 424                 DeferredUpdates::doUpdates( 'commit' );
 425                 $this->doJobs();
 426                 wfProfileOut( __METHOD__ );
 427         }
 428
 429         /**
 430          * Do a job from the job queue
 431          */
 432         private function doJobs() {
 433                 global $wgJobRunRate;
 434
 435                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 436                         return;
 437                 }
 438                 if ( $wgJobRunRate < 1 ) {
 439                         $max = mt_getrandmax();
 440                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 441                                 return;
 442                         }
 443                         $n = 1;
 444                 } else {
 445                         $n = intval( $wgJobRunRate );
 446                 }
 447
 448                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 449                         $output = $job->toString() . "\n";
 450                         $t = -wfTime();
 451                         $success = $job->run();
 452                         $t += wfTime();
 453                         $t = round( $t * 1000 );
 454                         if ( !$success ) {
 455                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 456                         } else {
 457                                 $output .= "Success, Time: $t ms\n";
 458                         }
 459                         wfDebugLog( 'jobqueue', $output );
 460                 }
 461         }
 462
 463         /**
 464          * Ends this task peacefully
 465          */
 466         public function restInPeace() {
 467                 MessageCache::logMessages();
 468                 wfLogProfilingData();
 469                 // Commit and close up!
 470                 $factory = wfGetLBFactory();
 471                 $factory->commitMasterChanges();
 472                 $factory->shutdown();
 473                 wfDebug( "Request ended normally\n" );
 474         }
 475
 476         /**
 477          * Perform one of the "standard" actions
 478          *
 479          * @param $article Article
 480          */
 481         private function performAction( Page $article ) {
 482                 global $wgSquidMaxage;
 483
 484                 wfProfileIn( __METHOD__ );
 485
 486                 $request = $this->context->getRequest();
 487                 $output = $this->context->getOutput();
 488                 $title = $this->context->getTitle();
 489                 $user = $this->context->getUser();
 490
 491                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 492                         array( $output, $article, $title, $user, $request, $this ) ) )
 493                 {
 494                         wfProfileOut( __METHOD__ );
 495                         return;
 496                 }
 497
 498                 $act = $this->getAction();
 499
 500                 $action = Action::factory( $act, $article );
 501                 if ( $action instanceof Action ) {
 502                         $this->performedAction = $act;
 503                         $action->show();
 504                         wfProfileOut( __METHOD__ );
 505                         return;
 506                 }
 507
 508                 switch( $act ) {
 509                         case 'view':
 510                                 $output->setSquidMaxage( $wgSquidMaxage );
 511                                 $this->performedAction = $act;
 512                                 $article->view();
 513                                 break;
 514                         case 'delete':
 515                         case 'protect':
 516                         case 'unprotect':
 517                         case 'render':
 518                                 $this->performedAction = $act;
 519                                 $article->$act();
 520                                 break;
 521                         case 'submit':
 522                                 if ( session_id() == '' ) {
 523                                         // Send a cookie so anons get talk message notifications
 524                                         wfSetupSession();
 525                                 }
 526                                 // Continue...
 527                         case 'edit':
 528                                 if ( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 529                                         $this->performedAction = 'edit';
 530                                         if ( ExternalEdit::useExternalEngine( $this->context, 'edit' )
 531                                                 && $act == 'edit' && !$request->getVal( 'section' )
 532                                                 && !$request->getVal( 'oldid' ) )
 533                                         {
 534                                                 $extedit = new ExternalEdit( $this->context );
 535                                                 $extedit->execute();
 536                                         } else {
 537                                                 $editor = new EditPage( $article );
 538                                                 $editor->edit();
 539                                         }
 540                                 }
 541                                 break;
 542                         default:
 543                                 if ( wfRunHooks( 'UnknownAction', array( $act, $article ) ) ) {
 544                                         $this->performedAction = 'nosuchaction';
 545                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 546                                 }
 547                 }
 548                 wfProfileOut( __METHOD__ );
 549         }
 550
 551         /**
 552          * Returns the real action as determined by performAction.
 553          * Do not use internally in this class as it depends on the actions by this class.
 554          *
 555          * @since 1.19
 556          *
 557          * @return string: action
 558          */
 559         public function getPerformedAction() {
 560                 return $this->performedAction;
 561         }
 562
 563         /**
 564          * Run the current MediaWiki instance
 565          * index.php just calls this
 566          */
 567         public function run() {
 568                 try {
 569                         $this->checkMaxLag();
 570                         $this->main();
 571                         $this->restInPeace();
 572                 } catch ( Exception $e ) {
 573                         MWExceptionHandler::handle( $e );
 574                 }
 575         }
 576
 577         /**
 578          * Checks if the request should abort due to a lagged server,
 579          * for given maxlag parameter.
 580          */
 581         private function checkMaxLag() {
 582                 global $wgShowHostnames;
 583
 584                 wfProfileIn( __METHOD__ );
 585                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 586                 if ( !is_null( $maxLag ) ) {
 587                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 588                         if ( $lag > $maxLag ) {
 589                                 $resp = $this->context->getRequest()->response();
 590                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 591                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 592                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 593                                 $resp->header( 'Content-Type: text/plain' );
 594                                 if( $wgShowHostnames ) {
 595                                         echo "Waiting for $host: $lag seconds lagged\n";
 596                                 } else {
 597                                         echo "Waiting for a database server: $lag seconds lagged\n";
 598                                 }
 599
 600                                 wfProfileOut( __METHOD__ );
 601
 602                                 exit;
 603                         }
 604                 }
 605                 wfProfileOut( __METHOD__ );
 606                 return true;
 607         }
 608
 609         private function main() {
 610                 global $wgUseFileCache, $wgTitle, $wgUseAjax;
 611
 612                 wfProfileIn( __METHOD__ );
 613
 614                 # Set title from request parameters
 615                 $wgTitle = $this->getTitle();
 616                 $action = $this->getAction();
 617
 618                 # Send Ajax requests to the Ajax dispatcher.
 619                 if ( $wgUseAjax && $action == 'ajax' ) {
 620                         $dispatcher = new AjaxDispatcher();
 621                         $dispatcher->performAction();
 622                         wfProfileOut( __METHOD__ );
 623                         return;
 624                 }
 625
 626                 if ( $wgUseFileCache && $this->getTitle()->getNamespace() >= 0 ) {
 627                         wfProfileIn( 'main-try-filecache' );
 628                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 629                                 /* Try low-level file cache hit */
 630                                 $cache = HTMLFileCache::newFromTitle( $this->getTitle(), $action );
 631                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 632                                         /* Check incoming headers to see if client has this cached */
 633                                         $timestamp = $cache->cacheTimestamp();
 634                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 635                                                 $cache->loadFromFileCache( $this->context );
 636                                         }
 637                                         # Do any stats increment/watchlist stuff
 638                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 639                                         # Tell OutputPage that output is taken care of
 640                                         $this->context->getOutput()->disable();
 641                                         wfProfileOut( 'main-try-filecache' );
 642                                         wfProfileOut( __METHOD__ );
 643                                         return;
 644                                 }
 645                         }
 646                         wfProfileOut( 'main-try-filecache' );
 647                 }
 648
 649                 $this->performRequest();
 650                 $this->finalCleanup();
 651
 652                 wfProfileOut( __METHOD__ );
 653         }
 654 }