* Proper redirect deletion
[lhc/web/wiklou.git] / includes / Wiki.php
index f024105..7945c7a 100644 (file)
 <?php
-
 /**
- * HOWTO
- * Make sure index.php ends with the following lines (find the match for the first lines and replace the rest)
-
-<?php
-       die();
-}
-
-require_once( './LocalSettings.php' );
-require_once( 'includes/Setup.php' );
+ * MediaWiki is the to-be base class for this whole project
+ */
 
-# The wiki action class
-require_once ( "includes/Wiki.php" ) ;
-?>
+class MediaWiki {
 
-*/
+       var $GET; /* Stores the $_GET variables at time of creation, can be changed */
+       var $params = array();
 
+       /** Constructor. It just save the $_GET variable */
+       function __construct() {
+               $this->GET = $_GET;
+       }
 
-#__________________________
-#wiki class
-
-class MediaWikiType {
-
+       /**
+        * Stores key/value pairs to circumvent global variables
+        * Note that keys are case-insensitive!
+        */
+       function setVal( $key, &$value ) {
+               $key = strtolower( $key );
+               $this->params[$key] =& $value;
+       }
 
-#____________________________________________________________________________________
-#Action methods
-       
-       function act_view ( $action ) {
-               global $wgOut , $wgSquidMaxage , $wgArticle ;
-               $wgOut->setSquidMaxage( $wgSquidMaxage );
-               $wgArticle->view();
+       /**
+        * Retrieves key/value pairs to circumvent global variables
+        * Note that keys are case-insensitive!
+        */
+       function getVal( $key, $default = '' ) {
+               $key = strtolower( $key );
+               if( isset( $this->params[$key] ) ) {
+                       return $this->params[$key];
+               }
+               return $default;
        }
-       
-       function act_print ( $action ) {
-               global $wgArticle ;
-               $wgArticle->view () ;
+
+       /**
+        * Initialization of ... everything
+        @return Article either the object to become $wgArticle, or NULL
+        */
+       function initialize ( &$title, &$output, &$user, $request) {
+               wfProfileIn( 'MediaWiki::initialize' );
+               $this->preliminaryChecks ( $title, $output, $request ) ;
+               $article = NULL;
+               if ( !$this->initializeSpecialCases( $title, $output, $request ) ) {
+                       $article = $this->initializeArticle( $title, $request );
+                       if( is_object( $article ) ) {
+                               $this->performAction( $output, $article, $title, $user, $request );
+                       } elseif( is_string( $article ) ) {
+                               $output->redirect( $article );
+                       } else {
+                               throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
+                       }
+               }
+               wfProfileOut( 'MediaWiki::initialize' );
+               return $article;
        }
-       
-       function act_dublincore ( $action ) {
-               global $wgArticle , $wgEnableDublinCoreRdf ;
-               if( !$wgEnableDublinCoreRdf ) {
-                       wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
+
+       function checkMaxLag( $maxLag ) {
+               global $wgLoadBalancer;
+               list( $host, $lag ) = $wgLoadBalancer->getMaxLag();
+               if ( $lag > $maxLag ) {
+                       wfMaxlagError( $host, $lag, $maxLag );
+                       return false;
                } else {
-                       require_once( 'includes/Metadata.php' );
-                       wfDublinCoreRdf( $wgArticle );
+                       return true;
                }
        }
-       
-       function act_creativecommons ( $action ) { 
-               global $wgArticle , $wgEnableCreativeCommonsRdf ;
-               if( !$wgEnableCreativeCommonsRdf ) {
-                       wfHttpError( 403, 'Forbidden', wfMsg('nocreativecommons') );
+
+
+       /**
+        * Checks some initial queries
+        * Note that $title here is *not* a Title object, but a string!
+        */
+       function checkInitialQueries( $title,$action,&$output,$request, $lang) {
+               if ($request->getVal( 'printable' ) == 'yes') {
+                       $output->setPrintable();
+               }
+
+               $ret = NULL ;
+
+
+               if ( '' == $title && 'delete' != $action ) {
+                       $ret = Title::newMainPage();
+               } elseif ( $curid = $request->getInt( 'curid' ) ) {
+                       # URLs like this are generated by RC, because rc_title isn't always accurate
+                       $ret = Title::newFromID( $curid );
                } else {
-                       require_once( 'includes/Metadata.php' );
-                       wfCreativeCommonsRdf( $wgArticle );
+                       $ret = Title::newFromURL( $title );
+                       /* check variant links so that interwiki links don't have to worry about
+                          the possible different language variants
+                       */
+                       if( count($lang->getVariants()) > 1 && !is_null($ret) && $ret->getArticleID() == 0 )
+                               $lang->findVariantLink( $title, $ret );
+
                }
-       }
-       
-       function act_credits ( $action ) { 
-               global $wgArticle ;
-               require_once( 'includes/Credits.php' );
-               showCreditsPage( $wgArticle );
-       }
-       
-       function act_submit ( $action ) { 
-               global $wgCommandLineMode , $wgRequest ;
-               if( !$wgCommandLineMode && !$wgRequest->checkSessionCookie() ) {
-                       # Send a cookie so anons get talk message notifications
-                       User::SetupSession();
+               if ( ( $oldid = $request->getInt( 'oldid' ) )
+                       && ( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) ) {
+                       // Allow oldid to override a changed or missing title.
+                       $rev = Revision::newFromId( $oldid );
+                       if( $rev ) {
+                               $ret = $rev->getTitle();
+                       }
                }
-               $this->act_edit ( $action ) ;
+               return $ret ;
        }
-       
-       function act_edit ( $action ) { 
-               global $wgRequest , $wgUseExternalEditor , $wgUser , $wgArticle ;
-               $internal = $wgRequest->getVal( 'internaledit' );
-               $external = $wgRequest->getVal( 'externaledit' );
-               $section = $wgRequest->getVal( 'section' );
-               $oldid = $wgRequest->getVal( 'oldid' );
-               if(!$wgUseExternalEditor || $action=='submit' || $internal ||
-                       $section || $oldid || (!$wgUser->getOption('externaleditor') && !$external)) {
-                       require_once( 'includes/EditPage.php' );
-                       $editor = new EditPage( $wgArticle );
-                       $editor->submit();
-               } elseif($wgUseExternalEditor && ($external || $wgUser->getOption('externaleditor'))) {
-                       require_once( 'includes/ExternalEdit.php' );
-                       $mode = $wgRequest->getVal( 'mode' );
-                       $extedit = new ExternalEdit( $wgArticle, $mode );
-                       $extedit->edit();
+
+       /**
+        * Checks for search query and anon-cannot-read case
+        */
+       function preliminaryChecks ( &$title, &$output, $request ) {
+
+               if( $request->getCheck( 'search' ) ) {
+                       // Compatibility with old search URLs which didn't use Special:Search
+                       // Just check for presence here, so blank requests still
+                       // show the search page when using ugly URLs (bug 8054).
+                       
+                       // Do this above the read whitelist check for security...
+                       $title = SpecialPage::getTitleFor( 'Search' );
                }
-       }
-       
-       function act_history ( $action ) { 
-               global $wgTitle , $wgArticle , $wgSquidMaxage ;
-               if ($_SERVER['REQUEST_URI'] == $wgTitle->getInternalURL('action=history')) {
-                       $wgOut->setSquidMaxage( $wgSquidMaxage );
+
+               # If the user is not logged in, the Namespace:title of the article must be in
+               # the Read array in order for the user to see it. (We have to check here to
+               # catch special pages etc. We check again in Article::view())
+               if ( !is_null( $title ) && !$title->userCanRead() ) {
+                       $output->loginToUse();
+                       $output->output();
+                       exit;
                }
-               require_once( 'includes/PageHistory.php' );
-               $history = new PageHistory( $wgArticle );
-               $history->history();
-       }
-       
-       function act_raw ( $action ) { 
-               global $wgArticle ;
-               require_once( 'includes/RawPage.php' );
-               $raw = new RawPage( $wgArticle );
-               $raw->view();
+
        }
-       
-       
-       function action_unknown ( $action ) {
-               global $wgArticle , $wgOut ;
-               if (wfRunHooks('UnknownAction', array($action, $wgArticle))) {
-                       $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
+
+       /**
+        * Initialize the object to be known as $wgArticle for special cases
+        */
+       function initializeSpecialCases ( &$title, &$output, $request ) {
+               global $wgRequest;
+               wfProfileIn( 'MediaWiki::initializeSpecialCases' );
+
+               $action = $this->getVal('Action');
+               if( !$title or $title->getDBkey() == '' ) {
+                       $title = SpecialPage::getTitleFor( 'Badtitle' );
+                       # Die now before we mess up $wgArticle and the skin stops working
+                       throw new ErrorPageError( 'badtitle', 'badtitletext' );
+               } else if ( $title->getInterwiki() != '' ) {
+                       if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
+                               $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
+                       } else {
+                               $url = $title->getFullURL();
+                       }
+                       /* Check for a redirect loop */
+                       if ( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
+                               $output->redirect( $url );
+                       } else {
+                               $title = SpecialPage::getTitleFor( 'Badtitle' );
+                               throw new ErrorPageError( 'badtitle', 'badtitletext' );
+                       }
+               } else if ( ( $action == 'view' ) && !$wgRequest->wasPosted() && 
+                       (!isset( $this->GET['title'] ) || $title->getPrefixedDBKey() != $this->GET['title'] ) &&
+                       !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
+               {
+                       $targetUrl = $title->getFullURL();
+                       // Redirect to canonical url, make it a 301 to allow caching
+                       global $wgUsePathInfo;
+                       if( $targetUrl == $wgRequest->getFullRequestURL() ) {
+                               $message = "Redirect loop detected!\n\n" .
+                                       "This means the wiki got confused about what page was " .
+                                       "requested; this sometimes happens when moving a wiki " .
+                                       "to a new server or changing the server configuration.\n\n";
+
+                               if( $wgUsePathInfo ) {
+                                       $message .= "The wiki is trying to interpret the page " .
+                                               "title from the URL path portion (PATH_INFO), which " .
+                                               "sometimes fails depending on the web server. Try " .
+                                               "setting \"\$wgUsePathInfo = false;\" in your " .
+                                               "LocalSettings.php, or check that \$wgArticlePath " .
+                                               "is correct.";
+                               } else {
+                                       $message .= "Your web server was detected as possibly not " .
+                                               "supporting URL path components (PATH_INFO) correctly; " .
+                                               "check your LocalSettings.php for a customized " .
+                                               "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
+                                               "to true.";
+                               }
+                               wfHttpError( 500, "Internal error", $message );
+                               return false;
+                       } else {
+                               $output->setSquidMaxage( 1200 );
+                               $output->redirect( $targetUrl, '301');
+                       }
+               } else if ( NS_SPECIAL == $title->getNamespace() ) {
+                       /* actions that need to be made when we have a special pages */
+                       SpecialPage::executePath( $title );
+               } else {
+                       /* No match to special cases */
+                       wfProfileOut( 'MediaWiki::initializeSpecialCases' );
+                       return false;
                }
-       }
-       
-       
-       function act_watch ( $action ) { $this->article_action ( $action ) ; } 
-       function act_unwatch ( $action ) { $this->article_action ( $action ) ; } 
-       function act_delete ( $action ) { $this->article_action ( $action ) ; } 
-       function act_revert ( $action ) { $this->article_action ( $action ) ; } 
-       function act_rollback ( $action ) { $this->article_action ( $action ) ; } 
-       function act_protect ( $action ) { $this->article_action ( $action ) ; } 
-       function act_unprotect ( $action ) { $this->article_action ( $action ) ; } 
-       function act_info ( $action ) { $this->article_action ( $action ) ; } 
-       function act_markpatrolled ( $action ) { $this->article_action ( $action ) ; } 
-       function act_render ( $action ) { $this->article_action ( $action ) ; } 
-       function act_deletetrackback ( $action ) { $this->article_action ( $action ) ; } 
-       function act_purge ( $action ) { $this->article_action ( $action ) ; } 
-
-       function article_action ( $action ) {
-               global $wgArticle ;
-               $wgArticle->$action() ;
+               /* Did match a special case */
+               wfProfileOut( 'MediaWiki::initializeSpecialCases' );
+               return true;
        }
 
-       
-} ; # end of class MediaWikiType
-
-
-$wgTheWiki = new MediaWikiType ;
-
-
-
-
-       
-#global $wgRequest , $wgOut , $wgTitle , $wgContLang ;
-#global $action , $title , $curid ;
-OutputPage::setEncodings(); # Not really used yet
-wfProfileIn( 'main-misc-setup' );
-
-# Query string fields
-$action = $wgRequest->getVal( 'action', 'view' );
-$title = $wgRequest->getVal( 'title' );
-
-if ($wgRequest->getVal( 'printable' ) == 'yes') {
-       $wgOut->setPrintable();
-}
-
-if ( '' == $title && 'delete' != $action ) {
-       $wgTitle = Title::newFromText( wfMsgForContent( 'mainpage' ) );
-} elseif ( $curid = $wgRequest->getInt( 'curid' ) ) {
-       # URLs like this are generated by RC, because rc_title isn't always accurate
-       $wgTitle = Title::newFromID( $curid );
-} else {
-       $wgTitle = Title::newFromURL( $title );
-       /* check variant links so that interwiki links don't have to worry about
-               the possible different language variants
-       */
-       if( count($wgContLang->getVariants()) > 1 && !is_null($wgTitle) && $wgTitle->getArticleID() == 0 )
-               $wgContLang->findVariantLink( $title, $wgTitle );
-
-}
-wfProfileOut( 'main-misc-setup' );
-
-#global $search , $wgRequest , $wgTitle ;
-$search = $wgRequest->getText( 'search' );
-if( !is_null( $search ) && $search !== '' ) {
-       // Compatibility with old search URLs which didn't use Special:Search
-       // Do this above the read whitelist check for security...
-       $wgTitle = Title::makeTitle( NS_SPECIAL, 'Search' );
-}
-
-#global $wgTitle , $wgOut ;
-# If the user is not logged in, the Namespace:title of the article must be in
-# the Read array in order for the user to see it. (We have to check here to
-# catch special pages etc. We check again in Article::view())
-if ( !is_null( $wgTitle ) && !$wgTitle->userCanRead() ) {
-       $wgOut->loginToUse();
-       $wgOut->output();
-       exit;
-}
-
-#global $wgTitle , $wgArticle , $wgRequest , $wgOut , $wgServer ;
-#global $wgDisableInternalSearch , $wgUseCategoryMagic , $wgDisabledActions ;
-#global $rdfrom , $url , $action , $ns , $rTitle , $search ;
-wfProfileIn( 'main-action' );
-
-if( !$wgDisableInternalSearch && !is_null( $search ) && $search !== '' ) {
-       require_once( 'includes/SpecialSearch.php' );
-       $wgTitle = Title::makeTitle( NS_SPECIAL, 'Search' );
-       wfSpecialSearch();
-} else if( !$wgTitle or $wgTitle->getDBkey() == '' ) {
-       $wgTitle = Title::newFromText( wfMsgForContent( 'badtitle' ) );
-       $wgOut->errorpage( 'badtitle', 'badtitletext' );
-} else if ( $wgTitle->getInterwiki() != '' ) {
-       if( $rdfrom = $wgRequest->getVal( 'rdfrom' ) ) {
-               $url = $wgTitle->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
-       } else {
-               $url = $wgTitle->getFullURL();
-       }
-       # Check for a redirect loop
-       if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url ) && $wgTitle->isLocal() ) {
-               $wgOut->redirect( $url );
-       } else {
-               $wgTitle = Title::newFromText( wfMsgForContent( 'badtitle' ) );
-               $wgOut->errorpage( 'badtitle', 'badtitletext' );
-       }
-} else if ( ( $action == 'view' ) &&
-       (!isset( $_GET['title'] ) || $wgTitle->getPrefixedDBKey() != $_GET['title'] ) &&
-       !count( array_diff( array_keys( $_GET ), array( 'action', 'title' ) ) ) )
-{
-       /* redirect to canonical url, make it a 301 to allow caching */
-       $wgOut->setSquidMaxage( 1200 );
-       $wgOut->redirect( $wgTitle->getFullURL(), '301');
-} else if ( NS_SPECIAL == $wgTitle->getNamespace() ) {
-       # actions that need to be made when we have a special pages
-       SpecialPage::executePath( $wgTitle );
-} else {
-       if ( NS_MEDIA == $wgTitle->getNamespace() ) {
-               $wgTitle = Title::makeTitle( NS_IMAGE, $wgTitle->getDBkey() );
-       }
+       /**
+        * Create an Article object of the appropriate class for the given page.
+        * @param Title $title
+        * @return Article
+        */
+       static function articleFromTitle( $title ) {
+               $article = null;
+               wfRunHooks('ArticleFromTitle', array( &$title, &$article ) );
+               if ( $article ) {
+                       return $article;
+               }
 
-       $ns = $wgTitle->getNamespace();
+               if( NS_MEDIA == $title->getNamespace() ) {
+                       // FIXME: where should this go?
+                       $title = Title::makeTitle( NS_IMAGE, $title->getDBkey() );
+               }
 
-       // Namespace might change when using redirects
-       if($action == 'view' && !$wgRequest->getVal( 'oldid' ) ) {
-               $wgArticle = new Article( $wgTitle );
-               $rTitle = Title::newFromRedirect( $wgArticle->fetchContent() );
-               if($rTitle) {
-                       # Reload from the page pointed to later
-                       $wgArticle->mContentLoaded = false;
-                       $ns = $rTitle->getNamespace();
+               switch( $title->getNamespace() ) {
+                       case NS_IMAGE:
+                               $file = RepoGroup::singleton()->findFile( $title->getText() );
+                               if( $file && $file->getRedirectedFrom() ) {
+                                       return new Article( $title );
+                               } else {
+                                       return new ImagePage( $title );
+                               }
+                       case NS_CATEGORY:
+                               return new CategoryPage( $title );
+                       default:
+                               return new Article( $title );
                }
        }
 
-       // Categories and images are handled by a different class
-       if ( $ns == NS_IMAGE ) {
-               unset($wgArticle);
-               require_once( 'includes/ImagePage.php' );
-               $wgArticle = new ImagePage( $wgTitle );
-       } elseif ( $wgUseCategoryMagic && $ns == NS_CATEGORY ) {
-               unset($wgArticle);
-               require_once( 'includes/CategoryPage.php' );
-               $wgArticle = new CategoryPage( $wgTitle );
+       /**
+        * Initialize the object to be known as $wgArticle for "standard" actions
+        * Create an Article object for the page, following redirects if needed.
+        * @param Title $title
+        * @param Request $request
+        * @param string $action
+        * @return mixed an Article, or a string to redirect to another URL
+        */
+       function initializeArticle( $title, $request ) {
+               global $wgTitle;
+               wfProfileIn( 'MediaWiki::initializeArticle' );
+
+               $action = $this->getVal('Action');
+               $article = $this->articleFromTitle( $title );
+
+               // Namespace might change when using redirects
+               if( ( $action == 'view' || $action == 'render' ) && !$request->getVal( 'oldid' ) &&
+                                               $request->getVal( 'redirect' ) != 'no' ) {
+
+                       $dbr = wfGetDB(DB_SLAVE);
+                       $article->loadPageData($article->pageDataFromTitle($dbr, $title));
+
+                       /* Follow redirects only for... redirects */
+                       if ($article->mIsRedirect) {
+                               $target = $article->followRedirect();
+                               if( is_string( $target ) ) {
+                                       global $wgDisableHardRedirects;
+                                       if( !$wgDisableHardRedirects ) {
+                                               // we'll need to redirect
+                                               return $target;
+                                       }
+                               }
+                               if( is_object( $target ) ) {
+                                       /* Rewrite environment to redirected article */
+                                       $rarticle = $this->articleFromTitle($target);
+                                       $rarticle->loadPageData($rarticle->pageDataFromTitle($dbr,$target));
+                                       if ($rarticle->mTitle->mArticleID) {
+                                               $article = $rarticle;
+                                               $wgTitle = $target;
+                                               $article->setRedirectedFrom( $title );
+                                       } else {
+                                               $wgTitle = $title;
+                                       }
+                               }
+                       } else {
+                               $wgTitle = $article->mTitle;
+                       }
+               }
+               wfProfileOut( 'MediaWiki::initializeArticle' );
+               return $article;
        }
 
-       if ( in_array( $action, $wgDisabledActions ) ) {
-               $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
-       } else {
-               $act = 'act_' . $action ;
-               if ( method_exists ( $wgTheWiki , $act ) ) {
-                       $wgTheWiki->$act ( $action ) ;
-               } else {
-                       $wgTheWiki->action_unknown ( $action ) ;
+       /**
+        * Cleaning up by doing deferred updates, calling loadbalancer and doing the output
+        */
+       function finalCleanup ( &$deferredUpdates, &$loadBalancer, &$output ) {
+               wfProfileIn( 'MediaWiki::finalCleanup' );
+               $this->doUpdates( $deferredUpdates );
+               $this->doJobs();
+               $loadBalancer->saveMasterPos();
+               # Now commit any transactions, so that unreported errors after output() don't roll back the whole thing
+               $loadBalancer->commitAll();
+               $output->output();
+               wfProfileOut( 'MediaWiki::finalCleanup' );
+       }
+
+       /**
+        * Deferred updates aren't really deferred anymore. It's important to report errors to the
+        * user, and that means doing this before OutputPage::output(). Note that for page saves,
+        * the client will wait until the script exits anyway before following the redirect.
+        */
+       function doUpdates ( &$updates ) {
+               wfProfileIn( 'MediaWiki::doUpdates' );
+               $dbw = wfGetDB( DB_MASTER );
+               foreach( $updates as $up ) {
+                       $up->doUpdate();
+
+                       # Commit after every update to prevent lock contention
+                       if ( $dbw->trxLevel() ) {
+                               $dbw->commit();
+                       }
                }
+               wfProfileOut( 'MediaWiki::doUpdates' );
        }
-}
 
-wfProfileOut( 'main-action' );
-#      }
+       /**
+        * Do a job from the job queue
+        */
+       function doJobs() {
+               global $wgJobRunRate;
+
+               if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
+                       return;
+               }
+               if ( $wgJobRunRate < 1 ) {
+                       $max = mt_getrandmax();
+                       if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
+                               return;
+                       }
+                       $n = 1;
+               } else {
+                       $n = intval( $wgJobRunRate );
+               }
 
+               while ( $n-- && false != ($job = Job::pop())) {
+                       $output = $job->toString() . "\n";
+                       $t = -wfTime();
+                       $success = $job->run();
+                       $t += wfTime();
+                       $t = round( $t*1000 );
+                       if ( !$success ) {
+                               $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
+                       } else {
+                               $output .= "Success, Time: $t ms\n";
+                       }
+                       wfDebugLog( 'jobqueue', $output );
+               }
+       }
 
-# Deferred updates aren't really deferred anymore. It's important to report errors to the
-# user, and that means doing this before OutputPage::output(). Note that for page saves,
-# the client will wait until the script exits anyway before following the redirect.
-wfProfileIn( 'main-updates' );
-global $wgDeferredUpdateList ;
-foreach ( $wgDeferredUpdateList as $up ) {
-       $up->doUpdate();
-}
-wfProfileOut( 'main-updates' );
-       
+       /**
+        * Ends this task peacefully
+        */
+       function restInPeace ( &$loadBalancer ) {
+               wfLogProfilingData();
+               $loadBalancer->closeAll();
+               wfDebug( "Request ended normally\n" );
+       }
 
-#global $wgLoadBalancer , $wgOut , $wgPostCommitUpdateList ;
-wfProfileIn( 'main-cleanup' );
-$wgLoadBalancer->saveMasterPos();
+       /**
+        * Perform one of the "standard" actions
+        */
+       function performAction( &$output, &$article, &$title, &$user, &$request ) {
 
-# Now commit any transactions, so that unreported errors after output() don't roll back the whole thing
-$wgLoadBalancer->commitAll();
+               wfProfileIn( 'MediaWiki::performAction' );
 
-$wgOut->output();
+               if ( !wfRunHooks('MediaWikiPerformAction', array($output, $article, $title, $user, $request)) ) {
+                       wfProfileOut( 'MediaWiki::performAction' );
+                       return;
+               }
 
-foreach ( $wgPostCommitUpdateList as $up ) {
-       $up->doUpdate();
-}
+               $action = $this->getVal('Action');
+               if( in_array( $action, $this->getVal('DisabledActions',array()) ) ) {
+                       /* No such action; this will switch to the default case */
+                       $action = 'nosuchaction';
+               }
 
-wfProfileOut( 'main-cleanup' );
+               switch( $action ) {
+                       case 'view':
+                               $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
+                               $article->view();
+                               break;
+                       case 'watch':
+                       case 'unwatch':
+                       case 'delete':
+                       case 'revert':
+                       case 'rollback':
+                       case 'protect':
+                       case 'unprotect':
+                       case 'info':
+                       case 'markpatrolled':
+                       case 'render':
+                       case 'deletetrackback':
+                       case 'purge':
+                               $article->$action();
+                               break;
+                       case 'print':
+                               $article->view();
+                               break;
+                       case 'dublincore':
+                               if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
+                                       wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
+                               } else {
+                                       require_once( 'includes/Metadata.php' );
+                                       wfDublinCoreRdf( $article );
+                               }
+                               break;
+                       case 'creativecommons':
+                               if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
+                                       wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
+                               } else {
+                                       require_once( 'includes/Metadata.php' );
+                                       wfCreativeCommonsRdf( $article );
+                               }
+                               break;
+                       case 'credits':
+                               require_once( 'includes/Credits.php' );
+                               showCreditsPage( $article );
+                               break;
+                       case 'submit':
+                               if( session_id() == '' ) {
+                                       /* Send a cookie so anons get talk message notifications */
+                                       wfSetupSession();
+                               }
+                               /* Continue... */
+                       case 'edit':
+                               if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
+                                       $internal = $request->getVal( 'internaledit' );
+                                       $external = $request->getVal( 'externaledit' );
+                                       $section = $request->getVal( 'section' );
+                                       $oldid = $request->getVal( 'oldid' );
+                                       if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
+                                          $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
+                                               $editor = new EditPage( $article );
+                                               $editor->submit();
+                                       } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
+                                               $mode = $request->getVal( 'mode' );
+                                               $extedit = new ExternalEdit( $article, $mode );
+                                               $extedit->edit();
+                                       }
+                               }
+                               break;
+                       case 'history':
+                               global $wgRequest;
+                               if( $wgRequest->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
+                                       $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
+                               }
+                               $history = new PageHistory( $article );
+                               $history->history();
+                               break;
+                       case 'raw':
+                               $raw = new RawPage( $article );
+                               $raw->view();
+                               break;
+                       default:
+                               if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
+                                       $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
+                               }
+               }
+               wfProfileOut( 'MediaWiki::performAction' );
 
-logProfilingData();
-$wgLoadBalancer->closeAll();
-wfDebug( "Request ended normally\n" );
+       }
 
+}; /* End of class MediaWiki */
 
-       
-?>