<?php
/**
* MediaWiki is the to-be base class for this whole project
*/
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;
}
/**
* 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;
}
/**
* 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;
}
/**
* 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 checkMaxLag( $maxLag ) {
global $wgLoadBalancer, $wgShowHostnames;
list( $host, $lag ) = $wgLoadBalancer->getMaxLag();
if ( $lag > $maxLag ) {
header( 'HTTP/1.1 503 Service Unavailable' );
header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
header( 'X-Database-Lag: ' . intval( $lag ) );
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";
}
return false;
} else {
return true;
}
}
/**
* 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 {
$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 );
}
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();
}
}
return $ret ;
}
/**
* Checks for search query and anon-cannot-read case
*/
function preliminaryChecks ( &$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' );
}
# 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;
}
}
/**
* 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;
}
/* Did match a special case */
wfProfileOut( 'MediaWiki::initializeSpecialCases' );
return true;
}
/**
* 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;
}
if( NS_MEDIA == $title->getNamespace() ) {
// FIXME: where should this go?
$title = Title::makeTitle( NS_IMAGE, $title->getDBkey() );
}
switch( $title->getNamespace() ) {
case NS_IMAGE:
return new ImagePage( $title );
case NS_CATEGORY:
return new CategoryPage( $title );
default:
return new Article( $title );
}
}
/**
* 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( $action == 'view' && !$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 $article;
}
/**
* Cleaning up by doing deferred updates, calling loadbalancer and doing the output
*/
function finalCleanup ( &$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' );
}
/**
* 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', $output );
}
}
/**
* Ends this task peacefully
*/
function restInPeace ( &$loadBalancer ) {
wfLogProfilingData();
$loadBalancer->closeAll();
wfDebug( "Request ended normally\n" );
}
/**
* Perform one of the "standard" actions
*/
function performAction( &$output, &$article, &$title, &$user, &$request ) {
wfProfileIn( 'MediaWiki::performAction' );
$action = $this->getVal('Action');
if( in_array( $action, $this->getVal('DisabledActions',array()) ) ) {
/* No such action; this will switch to the default case */
$action = 'nosuchaction';
}
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' );
}
}; /* End of class MediaWiki */
