Your IP : 172.69.214.232
<?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 {
/**
* TODO: fold $output, etc, into this
* @var IContextSource
*/
private $context;
/**
* @param $x null|WebRequest
* @return WebRequest
*/
public function request( WebRequest $x = null ) {
$old = $this->context->getRequest();
$this->context->setRequest( $x );
return $old;
}
/**
* @param $x null|OutputPage
* @return OutputPage
*/
public function output( OutputPage $x = null ) {
$old = $this->context->getOutput();
$this->context->setOutput( $x );
return $old;
}
/**
* @param IContextSource|null $context
*/
public function __construct( IContextSource $context = null ) {
if ( !$context ) {
$context = RequestContext::getMain();
}
$this->context = $context;
}
/**
* Parse the request to get the Title object
*
* @return 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 );
} elseif ( $title == '' && $action != 'delete' ) {
$ret = Title::newMainPage();
} 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 );
}
}
// For non-special titles, check for implicit titles
if ( is_null( $ret ) || !$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;
}
}
if ( $ret === null || ( $ret->getDBkey() == '' && $ret->getInterwiki() == '' ) ) {
$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;
}
/**
* Create an Article object of the appropriate class for the given page.
*
* @deprecated in 1.18; use Article::newFromTitle() instead
* @param $title Title
* @param $context IContextSource
* @return Article object
*/
public static function articleFromTitle( $title, IContextSource $context ) {
wfDeprecated( __METHOD__, '1.18' );
return Article::newFromTitle( $title, $context );
}
/**
* 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 $wgServer, $wgUsePathInfo, $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->getInterwiki() == '' ) ||
$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->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->getInterwiki() != '' ) {
$rdfrom = $request->getVal( 'rdfrom' );
if ( $rdfrom ) {
$url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
} else {
$query = $request->getValues();
unset( $query['title'] );
$url = $title->getFullURL( $query );
}
// Check for a redirect loop
if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $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 ( $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.";
}
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;
/**
* $wgArticle is deprecated, do not use it.
* @deprecated since 1.18
*/
global $wgArticle;
$wgArticle = new DeprecatedGlobal( 'wgArticle', $article, '1.18' );
$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() {
global $wgDisableHardRedirects;
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( $target ) ) {
if ( !$wgDisableHardRedirects ) {
// 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 $requestTitle The original title, before any redirects were applied
*/
private function performAction( Page $page, Title $requestTitle ) {
global $wgUseSquid, $wgSquidMaxage;
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 );
if ( $action instanceof Action ) {
# Let Squid cache things if we can purge them.
if ( $wgUseSquid &&
in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
) {
$output->setSquidMaxage( $wgSquidMaxage );
}
$action->show();
wfProfileOut( __METHOD__ );
return;
}
if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
$output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
}
wfProfileOut( __METHOD__ );
}
/**
* Run the current MediaWiki instance
* index.php just calls this
*/
public function run() {
try {
$this->checkMaxLag();
$this->main();
$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() {
global $wgShowHostnames;
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( $wgShowHostnames ) {
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 $wgUseFileCache, $wgTitle, $wgUseAjax;
wfProfileIn( __METHOD__ );
$request = $this->context->getRequest();
if ( $request->getCookie( 'forceHTTPS' )
&& $request->detectProtocol() == 'http'
&& $request->getMethod() == 'GET'
) {
$redirUrl = $request->getFullRequestURL();
$redirUrl = str_replace( 'http://', 'https://', $redirUrl );
// Setup dummy Title, otherwise OutputPage::redirect will fail
$title = Title::newFromText( NS_MAIN, 'REDIR' );
$this->context->setTitle( $title );
$output = $this->context->getOutput();
$output->redirect( $redirUrl );
$output->output();
wfProfileOut( __METHOD__ );
return;
}
// Send Ajax requests to the Ajax dispatcher.
if ( $wgUseAjax && $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();
$dispatcher->performAction();
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 ( $wgUseFileCache && $title->getNamespace() >= 0 ) {
wfProfileIn( 'main-try-filecache' );
if ( HTMLFileCache::useFileCache( $this->context ) ) {
// Try low-level file cache hit
$cache = HTMLFileCache::newFromTitle( $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
$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' );
}
$this->performRequest();
// 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' );
// Execute a job from the queue
$this->doJobs();
// 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" );
}
/**
* Do a job from the job queue
*/
private function doJobs() {
global $wgJobRunRate;
if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
return;
}
if ( $wgJobRunRate < 1 ) {
$max = mt_getrandmax();
if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
return; // the higher $wgJobRunRate, the less likely we return here
}
$n = 1;
} else {
$n = intval( $wgJobRunRate );
}
$group = JobQueueGroup::singleton();
do {
$job = $group->pop( JobQueueGroup::USE_CACHE ); // job from any queue
if ( $job ) {
$output = $job->toString() . "\n";
$t = - microtime( true );
$success = $job->run();
$group->ack( $job ); // done
$t += microtime( true );
$t = round( $t * 1000 );
if ( !$success ) {
$output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
} else {
$output .= "Success, Time: $t ms\n";
}
wfDebugLog( 'jobqueue', $output );
}
} while ( --$n && $job );
}
}