Update to MediaWiki 1.24.1

1 files changed, 704 insertions, 0 deletions

diff --git a/includes/MediaWiki.php b/includes/MediaWiki.php
new file mode 100644
index 00000000..402494ec
--- /dev/null
+++ b/includes/MediaWiki.php
@@ -0,0 +1,704 @@
+<?php
+/**
+ * Helper class for the index.php entry point.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * The MediaWiki class is the helper class for the index.php entry point.
+ *
+ * @internal documentation reviewed 15 Mar 2010
+ */
+class MediaWiki {
+	/**
+	 * @var IContextSource
+	 */
+	private $context;
+
+	/**
+	 * @var Config
+	 */
+	private $config;
+
+	/**
+	 * @param IContextSource|null $context
+	 */
+	public function __construct( IContextSource $context = null ) {
+		if ( !$context ) {
+			$context = RequestContext::getMain();
+		}
+
+		$this->context = $context;
+		$this->config = $context->getConfig();
+	}
+
+	/**
+	 * Parse the request to get the Title object
+	 *
+	 * @return Title Title object to be $wgTitle
+	 */
+	private function parseTitle() {
+		global $wgContLang;
+
+		$request = $this->context->getRequest();
+		$curid = $request->getInt( 'curid' );
+		$title = $request->getVal( 'title' );
+		$action = $request->getVal( 'action', 'view' );
+
+		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).
+			$ret = SpecialPage::getTitleFor( 'Search' );
+		} elseif ( $curid ) {
+			// URLs like this are generated by RC, because rc_title isn't always accurate
+			$ret = Title::newFromID( $curid );
+		} else {
+			$ret = Title::newFromURL( $title );
+			// Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
+			// in wikitext links to tell Parser to make a direct file link
+			if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
+				$ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
+			}
+			// 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( $ret ) && $ret->getArticleID() == 0
+			) {
+				$wgContLang->findVariantLink( $title, $ret );
+			}
+		}
+
+		// If title is not provided, always allow oldid and diff to set the title.
+		// If title is provided, allow oldid and diff to override the title, unless
+		// we are talking about a special page which might use these parameters for
+		// other purposes.
+		if ( $ret === null || !$ret->isSpecialPage() ) {
+			// We can have urls with just ?diff=,?oldid= or even just ?diff=
+			$oldid = $request->getInt( 'oldid' );
+			$oldid = $oldid ? $oldid : $request->getInt( 'diff' );
+			// Allow oldid to override a changed or missing title
+			if ( $oldid ) {
+				$rev = Revision::newFromId( $oldid );
+				$ret = $rev ? $rev->getTitle() : $ret;
+			}
+		}
+
+		// Use the main page as default title if nothing else has been provided
+		if ( $ret === null
+			&& strval( $title ) === ''
+			&& !$request->getCheck( 'curid' )
+			&& $action !== 'delete'
+		) {
+			$ret = Title::newMainPage();
+		}
+
+		if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
+			$ret = SpecialPage::getTitleFor( 'Badtitle' );
+		}
+
+		return $ret;
+	}
+
+	/**
+	 * Get the Title object that we'll be acting on, as specified in the WebRequest
+	 * @return Title
+	 */
+	public function getTitle() {
+		if ( $this->context->getTitle() === null ) {
+			$this->context->setTitle( $this->parseTitle() );
+		}
+		return $this->context->getTitle();
+	}
+
+	/**
+	 * Returns the name of the action that will be executed.
+	 *
+	 * @return string Action
+	 */
+	public function getAction() {
+		static $action = null;
+
+		if ( $action === null ) {
+			$action = Action::getActionName( $this->context );
+		}
+
+		return $action;
+	}
+
+	/**
+	 * Performs the request.
+	 * - bad titles
+	 * - read restriction
+	 * - local interwiki redirects
+	 * - redirect loop
+	 * - special pages
+	 * - normal pages
+	 *
+	 * @throws MWException|PermissionsError|BadTitleError|HttpError
+	 * @return void
+	 */
+	private function performRequest() {
+		global $wgTitle;
+
+		wfProfileIn( __METHOD__ );
+
+		$request = $this->context->getRequest();
+		$requestTitle = $title = $this->context->getTitle();
+		$output = $this->context->getOutput();
+		$user = $this->context->getUser();
+
+		if ( $request->getVal( 'printable' ) === 'yes' ) {
+			$output->setPrintable();
+		}
+
+		$unused = null; // To pass it by reference
+		wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
+
+		// Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
+		if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
+			|| $title->isSpecial( 'Badtitle' )
+		) {
+			$this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
+			wfProfileOut( __METHOD__ );
+			throw new BadTitleError();
+		}
+
+		// Check user's permissions to read this page.
+		// We have to check here to catch special pages etc.
+		// We will check again in Article::view().
+		$permErrors = $title->isSpecial( 'RunJobs' )
+			? array() // relies on HMAC key signature alone
+			: $title->getUserPermissionsErrors( 'read', $user );
+		if ( count( $permErrors ) ) {
+			// Bug 32276: allowing the skin to generate output with $wgTitle or
+			// $this->context->title set to the input title would allow anonymous users to
+			// determine whether a page exists, potentially leaking private data. In fact, the
+			// curid and oldid request  parameters would allow page titles to be enumerated even
+			// when they are not guessable. So we reset the title to Special:Badtitle before the
+			// permissions error is displayed.
+			//
+			// The skin mostly uses $this->context->getTitle() these days, but some extensions
+			// still use $wgTitle.
+
+			$badTitle = SpecialPage::getTitleFor( 'Badtitle' );
+			$this->context->setTitle( $badTitle );
+			$wgTitle = $badTitle;
+
+			wfProfileOut( __METHOD__ );
+			throw new PermissionsError( 'read', $permErrors );
+		}
+
+		$pageView = false; // was an article or special page viewed?
+
+		// Interwiki redirects
+		if ( $title->isExternal() ) {
+			$rdfrom = $request->getVal( 'rdfrom' );
+			if ( $rdfrom ) {
+				$url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
+			} else {
+				$query = $request->getValues();
+				unset( $query['title'] );
+				$url = $title->getFullURL( $query );
+			}
+			// Check for a redirect loop
+			if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
+				&& $title->isLocal()
+			) {
+				// 301 so google et al report the target as the actual url.
+				$output->redirect( $url, 301 );
+			} else {
+				$this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
+				wfProfileOut( __METHOD__ );
+				throw new BadTitleError();
+			}
+		// Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
+		} elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
+			&& ( $request->getVal( 'title' ) === null
+				|| $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
+			&& !count( $request->getValueNames( array( 'action', 'title' ) ) )
+			&& wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) )
+		) {
+			if ( $title->isSpecialPage() ) {
+				list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
+				if ( $name ) {
+					$title = SpecialPage::getTitleFor( $name, $subpage );
+				}
+			}
+			$targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
+			// Redirect to canonical url, make it a 301 to allow caching
+			if ( $targetUrl == $request->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 ( $this->config->get( 'UsePathInfo' ) ) {
+					$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.";
+				}
+				throw new HttpError( 500, $message );
+			} else {
+				$output->setSquidMaxage( 1200 );
+				$output->redirect( $targetUrl, '301' );
+			}
+		// Special pages
+		} elseif ( NS_SPECIAL == $title->getNamespace() ) {
+			$pageView = true;
+			// Actions that need to be made when we have a special pages
+			SpecialPageFactory::executePath( $title, $this->context );
+		} else {
+			// ...otherwise treat it as an article view. The article
+			// may be a redirect to another article or URL.
+			$article = $this->initializeArticle();
+			if ( is_object( $article ) ) {
+				$pageView = true;
+				$this->performAction( $article, $requestTitle );
+			} elseif ( is_string( $article ) ) {
+				$output->redirect( $article );
+			} else {
+				wfProfileOut( __METHOD__ );
+				throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
+					. " returned neither an object nor a URL" );
+			}
+		}
+
+		if ( $pageView ) {
+			// Promote user to any groups they meet the criteria for
+			$user->addAutopromoteOnceGroups( 'onView' );
+		}
+
+		wfProfileOut( __METHOD__ );
+	}
+
+	/**
+	 * Initialize the main Article object for "standard" actions (view, etc)
+	 * Create an Article object for the page, following redirects if needed.
+	 *
+	 * @return mixed An Article, or a string to redirect to another URL
+	 */
+	private function initializeArticle() {
+		wfProfileIn( __METHOD__ );
+
+		$title = $this->context->getTitle();
+		if ( $this->context->canUseWikiPage() ) {
+			// Try to use request context wiki page, as there
+			// is already data from db saved in per process
+			// cache there from this->getAction() call.
+			$page = $this->context->getWikiPage();
+			$article = Article::newFromWikiPage( $page, $this->context );
+		} else {
+			// This case should not happen, but just in case.
+			$article = Article::newFromTitle( $title, $this->context );
+			$this->context->setWikiPage( $article->getPage() );
+		}
+
+		// NS_MEDIAWIKI has no redirects.
+		// It is also used for CSS/JS, so performance matters here...
+		if ( $title->getNamespace() == NS_MEDIAWIKI ) {
+			wfProfileOut( __METHOD__ );
+			return $article;
+		}
+
+		$request = $this->context->getRequest();
+
+		// Namespace might change when using redirects
+		// Check for redirects ...
+		$action = $request->getVal( 'action', 'view' );
+		$file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
+		if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
+			&& !$request->getVal( 'oldid' ) // ... and are not old revisions
+			&& !$request->getVal( 'diff' ) // ... and not when showing diff
+			&& $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
+			// ... and the article is not a non-redirect image page with associated file
+			&& !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
+		) {
+			// Give extensions a change to ignore/handle redirects as needed
+			$ignoreRedirect = $target = false;
+
+			wfRunHooks( 'InitializeArticleMaybeRedirect',
+				array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
+
+			// Follow redirects only for... redirects.
+			// If $target is set, then a hook wanted to redirect.
+			if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
+				// Is the target already set by an extension?
+				$target = $target ? $target : $article->followRedirect();
+				if ( is_string( $target ) ) {
+					if ( !$this->config->get( 'DisableHardRedirects' ) ) {
+						// we'll need to redirect
+						wfProfileOut( __METHOD__ );
+						return $target;
+					}
+				}
+				if ( is_object( $target ) ) {
+					// Rewrite environment to redirected article
+					$rarticle = Article::newFromTitle( $target, $this->context );
+					$rarticle->loadPageData();
+					if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
+						$rarticle->setRedirectedFrom( $title );
+						$article = $rarticle;
+						$this->context->setTitle( $target );
+						$this->context->setWikiPage( $article->getPage() );
+					}
+				}
+			} else {
+				$this->context->setTitle( $article->getTitle() );
+				$this->context->setWikiPage( $article->getPage() );
+			}
+		}
+
+		wfProfileOut( __METHOD__ );
+		return $article;
+	}
+
+	/**
+	 * Perform one of the "standard" actions
+	 *
+	 * @param Page $page
+	 * @param Title $requestTitle The original title, before any redirects were applied
+	 */
+	private function performAction( Page $page, Title $requestTitle ) {
+		wfProfileIn( __METHOD__ );
+
+		$request = $this->context->getRequest();
+		$output = $this->context->getOutput();
+		$title = $this->context->getTitle();
+		$user = $this->context->getUser();
+
+		if ( !wfRunHooks( 'MediaWikiPerformAction',
+				array( $output, $page, $title, $user, $request, $this ) )
+		) {
+			wfProfileOut( __METHOD__ );
+			return;
+		}
+
+		$act = $this->getAction();
+
+		$action = Action::factory( $act, $page, $this->context );
+
+		if ( $action instanceof Action ) {
+			# Let Squid cache things if we can purge them.
+			if ( $this->config->get( 'UseSquid' ) &&
+				in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
+			) {
+				$output->setSquidMaxage( $this->config->get( 'SquidMaxage' ) );
+			}
+
+			$action->show();
+			wfProfileOut( __METHOD__ );
+			return;
+		}
+
+		if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
+			$output->setStatusCode( 404 );
+			$output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
+		}
+
+		wfProfileOut( __METHOD__ );
+	}
+
+	/**
+	 * Run the current MediaWiki instance
+	 * index.php just calls this
+	 */
+	public function run() {
+		try {
+			$this->checkMaxLag();
+			try {
+				$this->main();
+			} catch ( ErrorPageError $e ) {
+				// Bug 62091: while exceptions are convenient to bubble up GUI errors,
+				// they are not internal application faults. As with normal requests, this
+				// should commit, print the output, do deferred updates, jobs, and profiling.
+				wfGetLBFactory()->commitMasterChanges();
+				$e->report(); // display the GUI error
+			}
+			if ( function_exists( 'fastcgi_finish_request' ) ) {
+				fastcgi_finish_request();
+			}
+			$this->triggerJobs();
+			$this->restInPeace();
+		} catch ( Exception $e ) {
+			MWExceptionHandler::handle( $e );
+		}
+	}
+
+	/**
+	 * Checks if the request should abort due to a lagged server,
+	 * for given maxlag parameter.
+	 * @return bool
+	 */
+	private function checkMaxLag() {
+		wfProfileIn( __METHOD__ );
+		$maxLag = $this->context->getRequest()->getVal( 'maxlag' );
+		if ( !is_null( $maxLag ) ) {
+			list( $host, $lag ) = wfGetLB()->getMaxLag();
+			if ( $lag > $maxLag ) {
+				$resp = $this->context->getRequest()->response();
+				$resp->header( 'HTTP/1.1 503 Service Unavailable' );
+				$resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
+				$resp->header( 'X-Database-Lag: ' . intval( $lag ) );
+				$resp->header( 'Content-Type: text/plain' );
+				if ( $this->config->get( 'ShowHostnames' ) ) {
+					echo "Waiting for $host: $lag seconds lagged\n";
+				} else {
+					echo "Waiting for a database server: $lag seconds lagged\n";
+				}
+
+				wfProfileOut( __METHOD__ );
+
+				exit;
+			}
+		}
+		wfProfileOut( __METHOD__ );
+		return true;
+	}
+
+	private function main() {
+		global $wgTitle;
+
+		wfProfileIn( __METHOD__ );
+
+		$request = $this->context->getRequest();
+
+		// Send Ajax requests to the Ajax dispatcher.
+		if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action', 'view' ) == 'ajax' ) {
+
+			// Set a dummy title, because $wgTitle == null might break things
+			$title = Title::makeTitle( NS_MAIN, 'AJAX' );
+			$this->context->setTitle( $title );
+			$wgTitle = $title;
+
+			$dispatcher = new AjaxDispatcher( $this->config );
+			$dispatcher->performAction( $this->context->getUser() );
+			wfProfileOut( __METHOD__ );
+			return;
+		}
+
+		// Get title from request parameters,
+		// is set on the fly by parseTitle the first time.
+		$title = $this->getTitle();
+		$action = $this->getAction();
+		$wgTitle = $title;
+
+		// If the user has forceHTTPS set to true, or if the user
+		// is in a group requiring HTTPS, or if they have the HTTPS
+		// preference set, redirect them to HTTPS.
+		// Note: Do this after $wgTitle is setup, otherwise the hooks run from
+		// isLoggedIn() will do all sorts of weird stuff.
+		if (
+			$request->getProtocol() == 'http' &&
+			(
+				$request->getCookie( 'forceHTTPS', '' ) ||
+				// check for prefixed version for currently logged in users
+				$request->getCookie( 'forceHTTPS' ) ||
+				// Avoid checking the user and groups unless it's enabled.
+				(
+					$this->context->getUser()->isLoggedIn()
+					&& $this->context->getUser()->requiresHTTPS()
+				)
+			)
+		) {
+			$oldUrl = $request->getFullRequestURL();
+			$redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
+
+			// ATTENTION: This hook is likely to be removed soon due to overall design of the system.
+			if ( wfRunHooks( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
+
+				if ( $request->wasPosted() ) {
+					// This is weird and we'd hope it almost never happens. This
+					// means that a POST came in via HTTP and policy requires us
+					// redirecting to HTTPS. It's likely such a request is going
+					// to fail due to post data being lost, but let's try anyway
+					// and just log the instance.
+					//
+					// @todo FIXME: See if we could issue a 307 or 308 here, need
+					// to see how clients (automated & browser) behave when we do
+					wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
+				}
+				// Setup dummy Title, otherwise OutputPage::redirect will fail
+				$title = Title::newFromText( NS_MAIN, 'REDIR' );
+				$this->context->setTitle( $title );
+				$output = $this->context->getOutput();
+				// Since we only do this redir to change proto, always send a vary header
+				$output->addVaryHeader( 'X-Forwarded-Proto' );
+				$output->redirect( $redirUrl );
+				$output->output();
+				wfProfileOut( __METHOD__ );
+				return;
+			}
+		}
+
+		if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
+			wfProfileIn( 'main-try-filecache' );
+			if ( HTMLFileCache::useFileCache( $this->context ) ) {
+				// Try low-level file cache hit
+				$cache = new HTMLFileCache( $title, $action );
+				if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
+					// Check incoming headers to see if client has this cached
+					$timestamp = $cache->cacheTimestamp();
+					if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
+						$cache->loadFromFileCache( $this->context );
+					}
+					// Do any stats increment/watchlist stuff
+					// Assume we're viewing the latest revision (this should always be the case with file cache)
+					$this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
+					// Tell OutputPage that output is taken care of
+					$this->context->getOutput()->disable();
+					wfProfileOut( 'main-try-filecache' );
+					wfProfileOut( __METHOD__ );
+					return;
+				}
+			}
+			wfProfileOut( 'main-try-filecache' );
+		}
+
+		// Actually do the work of the request and build up any output
+		$this->performRequest();
+
+		// Either all DB and deferred updates should happen or none.
+		// The later should not be cancelled due to client disconnect.
+		ignore_user_abort( true );
+		// Now commit any transactions, so that unreported errors after
+		// output() don't roll back the whole DB transaction
+		wfGetLBFactory()->commitMasterChanges();
+
+		// Output everything!
+		$this->context->getOutput()->output();
+
+		wfProfileOut( __METHOD__ );
+	}
+
+	/**
+	 * Ends this task peacefully
+	 */
+	public function restInPeace() {
+		// Do any deferred jobs
+		DeferredUpdates::doUpdates( 'commit' );
+
+		// Log profiling data, e.g. in the database or UDP
+		wfLogProfilingData();
+
+		// Commit and close up!
+		$factory = wfGetLBFactory();
+		$factory->commitMasterChanges();
+		$factory->shutdown();
+
+		wfDebug( "Request ended normally\n" );
+	}
+
+	/**
+	 * Potentially open a socket and sent an HTTP request back to the server
+	 * to run a specified number of jobs. This registers a callback to cleanup
+	 * the socket once it's done.
+	 */
+	protected function triggerJobs() {
+		$jobRunRate = $this->config->get( 'JobRunRate' );
+		if ( $jobRunRate <= 0 || wfReadOnly() ) {
+			return;
+		} elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
+			return; // recursion guard
+		}
+
+		$section = new ProfileSection( __METHOD__ );
+
+		if ( $jobRunRate < 1 ) {
+			$max = mt_getrandmax();
+			if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
+				return; // the higher the job run rate, the less likely we return here
+			}
+			$n = 1;
+		} else {
+			$n = intval( $jobRunRate );
+		}
+
+		if ( !$this->config->get( 'RunJobsAsync' ) ) {
+			// Fall back to running the job here while the user waits
+			$runner = new JobRunner();
+			$runner->run( array( 'maxJobs'  => $n ) );
+			return;
+		}
+
+		try {
+			if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
+				return; // do not send request if there are probably no jobs
+			}
+		} catch ( JobQueueError $e ) {
+			MWExceptionHandler::logException( $e );
+			return; // do not make the site unavailable
+		}
+
+		$query = array( 'title' => 'Special:RunJobs',
+			'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
+		$query['signature'] = SpecialRunJobs::getQuerySignature(
+			$query, $this->config->get( 'SecretKey' ) );
+
+		$errno = $errstr = null;
+		$info = wfParseUrl( $this->config->get( 'Server' ) );
+		wfSuppressWarnings();
+		$sock = fsockopen(
+			$info['host'],
+			isset( $info['port'] ) ? $info['port'] : 80,
+			$errno,
+			$errstr,
+			// If it takes more than 100ms to connect to ourselves there
+			// is a problem elsewhere.
+			0.1
+		);
+		wfRestoreWarnings();
+		if ( !$sock ) {
+			wfDebugLog( 'runJobs', "Failed to start cron API (socket error $errno): $errstr\n" );
+			// Fall back to running the job here while the user waits
+			$runner = new JobRunner();
+			$runner->run( array( 'maxJobs'  => $n ) );
+			return;
+		}
+
+		$url = wfAppendQuery( wfScript( 'index' ), $query );
+		$req = "POST $url HTTP/1.1\r\nHost: {$info['host']}\r\nConnection: Close\r\nContent-Length: 0\r\n\r\n";
+
+		wfDebugLog( 'runJobs', "Running $n job(s) via '$url'\n" );
+		// Send a cron API request to be performed in the background.
+		// Give up if this takes too long to send (which should be rare).
+		stream_set_timeout( $sock, 1 );
+		$bytes = fwrite( $sock, $req );
+		if ( $bytes !== strlen( $req ) ) {
+			wfDebugLog( 'runJobs', "Failed to start cron API (socket write error)\n" );
+		} else {
+			// Do not wait for the response (the script should handle client aborts).
+			// Make sure that we don't close before that script reaches ignore_user_abort().
+			$status = fgets( $sock );
+			if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
+				wfDebugLog( 'runJobs', "Failed to start cron API: received '$status'\n" );
+			}
+		}
+		fclose( $sock );
+	}
+}