Current File : //data/www_bck/varak.net_bck/havranipapuce.varak.net/includes/MediaWiki.php
<?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
*/
use MediaWiki\Logger\LoggerFactory;
/**
* The MediaWiki class is the helper class for the index.php entry point.
*/
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' );
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->hasTitle() ) {
$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;
$request = $this->context->getRequest();
$requestTitle = $title = $this->context->getTitle();
$output = $this->context->getOutput();
$user = $this->context->getUser();
if ( $request->getVal( 'printable' ) === 'yes' ) {
$output->setPrintable();
}
$unused = null; // To pass it by reference
Hooks::run( 'BeforeInitialize', array( &$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' ) );
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;
throw new PermissionsError( 'read', $permErrors );
}
// 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' ) );
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' ) ) )
&& Hooks::run( '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() ) {
// 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 ) ) {
$this->performAction( $article, $requestTitle );
} elseif ( is_string( $article ) ) {
$output->redirect( $article );
} else {
throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
. " returned neither an object nor a URL" );
}
}
}
/**
* 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() {
$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 ) {
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 = $target = false;
Hooks::run( 'InitializeArticleMaybeRedirect',
array( &$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
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() );
}
}
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 ) {
$request = $this->context->getRequest();
$output = $this->context->getOutput();
$title = $this->context->getTitle();
$user = $this->context->getUser();
if ( !Hooks::run( 'MediaWikiPerformAction',
array( $output, $page, $title, $user, $request, $this ) )
) {
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(
// Use PROTO_INTERNAL because that's what getSquidURLs() uses
wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
$requestTitle->getSquidURLs()
)
) {
$output->setSquidMaxage( $this->config->get( 'SquidMaxage' ) );
}
$action->show();
return;
}
if ( Hooks::run( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
$output->setStatusCode( 404 );
$output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
}
}
/**
* 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::handleException( $e );
}
}
/**
* Checks if the request should abort due to a lagged server,
* for given maxlag parameter.
* @return bool
*/
private function checkMaxLag() {
$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";
}
exit;
}
}
return true;
}
private function main() {
global $wgTitle;
$request = $this->context->getRequest();
// Send Ajax requests to the Ajax dispatcher.
if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
// Set a dummy title, because $wgTitle == null might break things
$title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
. __METHOD__
);
$this->context->setTitle( $title );
$wgTitle = $title;
$dispatcher = new AjaxDispatcher( $this->config );
$dispatcher->performAction( $this->context->getUser() );
return;
}
// Get title from request parameters,
// is set on the fly by parseTitle the first time.
$title = $this->getTitle();
$action = $this->getAction();
$wgTitle = $title;
$trxProfiler = Profiler::instance()->getTransactionProfiler();
$trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
// Aside from rollback, master queries should not happen on GET requests.
// Periodic or "in passing" updates on GET should use the job queue.
if ( !$request->wasPosted()
&& in_array( $action, array( 'view', 'edit', 'history' ) )
) {
$trxProfiler->setExpectation( 'masterConns', 0, __METHOD__ );
$trxProfiler->setExpectation( 'writes', 0, __METHOD__ );
} else {
$trxProfiler->setExpectation( 'maxAffected', 500, __METHOD__ );
}
// 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 ( Hooks::run( '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( 'REDIR', NS_MAIN );
$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();
return;
}
}
if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
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();
return;
}
}
}
// 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();
}
/**
* Ends this task peacefully
*/
public function restInPeace() {
// Ignore things like master queries/connections on GET requests
// as long as they are in deferred updates (which catch errors).
Profiler::instance()->getTransactionProfiler()->resetExpectations();
// 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
}
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 );
}
$runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
if ( !$this->config->get( 'RunJobsAsync' ) ) {
// Fall back to running the job here while the user waits
$runner = new JobRunner( $runJobsLogger );
$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 ) {
$runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
// Fall back to running the job here while the user waits
$runner = new JobRunner( $runJobsLogger );
$runner->run( array( 'maxJobs' => $n ) );
return;
}
$url = wfAppendQuery( wfScript( 'index' ), $query );
$req = (
"POST $url HTTP/1.1\r\n" .
"Host: {$info['host']}\r\n" .
"Connection: Close\r\n" .
"Content-Length: 0\r\n\r\n"
);
$runJobsLogger->info( "Running $n job(s) via '$url'" );
// 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 ) ) {
$runJobsLogger->error( "Failed to start cron API (socket write error)" );
} 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 ) ) {
$runJobsLogger->error( "Failed to start cron API: received '$status'" );
}
}
fclose( $sock );
}
}
Mini Shell