index.php

   1 <?php
   2
   3 /**
   4  * This is the main web entry point for MediaWiki.
   5  *
   6  * If you are reading this in your web browser, your server is probably
   7  * not configured correctly to run PHP applications!
   8  *
   9  * See the README, INSTALL, and UPGRADE files for basic setup instructions
  10  * and pointers to the online documentation.
  11  *
  12  * http://www.mediawiki.org/
  13  *
  14  * ----------
  15  *
  16  * Copyright (C) 2001-2011 Magnus Manske, Brion Vibber, Lee Daniel Crocker,
  17  * Tim Starling, Erik Möller, Gabriel Wicke, Ævar Arnfjörð Bjarmason,
  18  * Niklas Laxström, Domas Mituzas, Rob Church, Yuri Astrakhan, Aryeh Gregor,
  19  * Aaron Schulz, Andrew Garrett, Raimond Spekking, Alexandre Emsenhuber
  20  * Siebrand Mazeland, Chad Horohoe, Roan Kattouw and others.
  21  *
  22  * This program is free software; you can redistribute it and/or modify
  23  * it under the terms of the GNU General Public License as published by
  24  * the Free Software Foundation; either version 2 of the License, or
  25  * (at your option) any later version.
  26  *
  27  * This program is distributed in the hope that it will be useful,
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  30  * GNU General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public License along
  33  * with this program; if not, write to the Free Software Foundation, Inc.,
  34  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  35  * http://www.gnu.org/copyleft/gpl.html
  36  *
  37  * @file
  38  */
  39
  40 # Initialise common code.  This gives us access to GlobalFunctions, the AutoLoader, and
  41 # the globals $wgRequest, $wgOut, $wgUser, $wgLang and $wgContLang, amongst others; it
  42 # does *not* load $wgTitle or $wgArticle
  43 require ( dirname( __FILE__ ) . '/includes/WebStart.php' );
  44
  45 wfProfileIn( 'index.php' );
  46 wfProfileIn( 'index.php-setup' );
  47
  48 $maxLag = $wgRequest->getVal( 'maxlag' );
  49 if ( !is_null( $maxLag ) ) {
  50         list( $host, $lag ) = wfGetLB()->getMaxLag();
  51         if ( $lag > $maxLag ) {
  52                 header( 'HTTP/1.1 503 Service Unavailable' );
  53                 header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
  54                 header( 'X-Database-Lag: ' . intval( $lag ) );
  55                 header( 'Content-Type: text/plain' );
  56                 if( $wgShowHostnames ) {
  57                         echo "Waiting for $host: $lag seconds lagged\n";
  58                 } else {
  59                         echo "Waiting for a database server: $lag seconds lagged\n";
  60                 }
  61                 exit;
  62         }
  63 }
  64
  65 # Initialize MediaWiki base class
  66 $context = RequestContext::getMain();
  67 $mediaWiki = new MediaWiki( $context );
  68
  69 # Set title from request parameters
  70 $wgTitle = $mediaWiki->getTitle();
  71 $action = $wgRequest->getVal( 'action', 'view' );
  72
  73 wfProfileOut( 'index.php-setup' );
  74
  75 # Send Ajax requests to the Ajax dispatcher.
  76 if ( $wgUseAjax && $action == 'ajax' ) {
  77         $dispatcher = new AjaxDispatcher();
  78         $dispatcher->performAction();
  79         wfProfileOut( 'index.php' );
  80         $mediaWiki->restInPeace();
  81         exit;
  82 }
  83
  84 if ( $wgUseFileCache && $wgTitle !== null ) {
  85         wfProfileIn( 'index.php-filecache' );
  86         // Raw pages should handle cache control on their own,
  87         // even when using file cache. This reduces hits from clients.
  88         if ( $action != 'raw' && HTMLFileCache::useFileCache() ) {
  89                 /* Try low-level file cache hit */
  90                 $cache = new HTMLFileCache( $wgTitle, $action );
  91                 if ( $cache->isFileCacheGood( /* Assume up to date */ ) ) {
  92                         /* Check incoming headers to see if client has this cached */
  93                         if ( !$context->output->checkLastModified( $cache->fileCacheTime() ) ) {
  94                                 $cache->loadFromFileCache();
  95                         }
  96                         # Do any stats increment/watchlist stuff
  97                         $wgArticle = MediaWiki::articleFromTitle( $wgTitle );
  98                         $wgArticle->viewUpdates();
  99                         # Tell OutputPage that output is taken care of
 100                         $context->output->disable();
 101                         wfProfileOut( 'index.php-filecache' );
 102                         $mediaWiki->finalCleanup();
 103                         wfProfileOut( 'index.php' );
 104                         $mediaWiki->restInPeace();
 105                         exit;
 106                 }
 107         }
 108         wfProfileOut( 'index.php-filecache' );
 109 }
 110
 111 # Setting global variables in mediaWiki
 112 $mediaWiki->setVal( 'DisableHardRedirects', $wgDisableHardRedirects );
 113 $mediaWiki->setVal( 'EnableCreativeCommonsRdf', $wgEnableCreativeCommonsRdf );
 114 $mediaWiki->setVal( 'EnableDublinCoreRdf', $wgEnableDublinCoreRdf );
 115 $mediaWiki->setVal( 'Server', $wgServer );
 116 $mediaWiki->setVal( 'SquidMaxage', $wgSquidMaxage );
 117 $mediaWiki->setVal( 'UseExternalEditor', $wgUseExternalEditor );
 118 $mediaWiki->setVal( 'UsePathInfo', $wgUsePathInfo );
 119
 120 $mediaWiki->performRequestForTitle( $wgArticle );
 121 $mediaWiki->finalCleanup();
 122
 123 wfProfileOut( 'index.php' );
 124
 125 $mediaWiki->restInPeace();