index.php

   1 <?php
   2 /**
   3  * This is the main web entry point for MediaWiki.
   4  *
   5  * If you are reading this in your web browser, your server is probably
   6  * not configured correctly to run PHP applications!
   7  *
   8  * See the README, INSTALL, and UPGRADE files for basic setup instructions
   9  * and pointers to the online documentation.
  10  *
  11  * http://www.mediawiki.org/
  12  *
  13  * ----------
  14  *
  15  * Copyright (C) 2001-2011 Magnus Manske, Brion Vibber, Lee Daniel Crocker,
  16  * Tim Starling, Erik Möller, Gabriel Wicke, Ævar Arnfjörð Bjarmason,
  17  * Niklas Laxström, Domas Mituzas, Rob Church, Yuri Astrakhan, Aryeh Gregor,
  18  * Aaron Schulz, Andrew Garrett, Raimond Spekking, Alexandre Emsenhuber
  19  * Siebrand Mazeland, Chad Horohoe, Roan Kattouw and others.
  20  *
  21  * This program is free software; you can redistribute it and/or modify
  22  * it under the terms of the GNU General Public License as published by
  23  * the Free Software Foundation; either version 2 of the License, or
  24  * (at your option) any later version.
  25  *
  26  * This program is distributed in the hope that it will be useful,
  27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  29  * GNU General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License along
  32  * with this program; if not, write to the Free Software Foundation, Inc.,
  33  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  34  * http://www.gnu.org/copyleft/gpl.html
  35  *
  36  * @file
  37  */
  38
  39 // Bail on old versions of PHP.  Pretty much every other file in the codebase
  40 // has structures (try/catch, foo()->bar(), etc etc) which throw parse errors in PHP 4.
  41 // Setup.php and ObjectCache.php have structures invalid in PHP 5.0 and 5.1, respectively.
  42 if ( !function_exists( 'version_compare' ) || version_compare( phpversion(), '5.2.0' ) < 0 ) {
  43         $phpversion = htmlspecialchars( phpversion() );
  44         $errorMsg = <<<ENDL
  45                 <p>
  46                         MediaWiki requires PHP 5.2.3 or higher. You are running PHP $phpversion.
  47                 </p>
  48                 <p>
  49                         Please consider <a href="http://www.php.net/downloads.php">upgrading your copy of PHP</a>.
  50                         PHP versions less than 5.3.0 are no longer supported by the PHP Group and will not receive
  51                         security or bugfix updates.
  52                 </p>
  53                 <p>
  54                         If for some reason you are unable to upgrade your PHP version, you will need to
  55                         <a href="http://www.mediawiki.org/wiki/Download">download</a> an older version
  56                         of MediaWiki from our website.  See our
  57                         <a href="http://www.mediawiki.org/wiki/Compatibility#PHP">compatibility page</a>
  58                         for details of which versions are compatible with prior versions of PHP.
  59                 </p>
  60 ENDL;
  61         wfDie( $errorMsg );
  62 }
  63
  64 # Initialise common code.  This gives us access to GlobalFunctions, the AutoLoader, and
  65 # the globals $wgRequest, $wgOut, $wgUser, $wgLang and $wgContLang, amongst others; it
  66 # does *not* load $wgTitle or $wgArticle
  67 require ( dirname( __FILE__ ) . '/includes/WebStart.php' );
  68
  69 wfProfileIn( 'index.php' );
  70 wfProfileIn( 'index.php-setup' );
  71
  72 $maxLag = $wgRequest->getVal( 'maxlag' );
  73 if ( !is_null( $maxLag ) ) {
  74         $lb = wfGetLB(); // foo()->bar() is not supported in PHP4
  75         list( $host, $lag ) = $lb->getMaxLag();
  76         if ( $lag > $maxLag ) {
  77                 header( 'HTTP/1.1 503 Service Unavailable' );
  78                 header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
  79                 header( 'X-Database-Lag: ' . intval( $lag ) );
  80                 header( 'Content-Type: text/plain' );
  81                 if( $wgShowHostnames ) {
  82                         echo "Waiting for $host: $lag seconds lagged\n";
  83                 } else {
  84                         echo "Waiting for a database server: $lag seconds lagged\n";
  85                 }
  86                 exit;
  87         }
  88 }
  89
  90 # Initialize MediaWiki base class
  91 $context = RequestContext::getMain();
  92 $mediaWiki = new MediaWiki( $context );
  93
  94 # Set title from request parameters
  95 $wgTitle = $mediaWiki->getTitle();
  96 $action = $wgRequest->getVal( 'action', 'view' );
  97
  98 wfProfileOut( 'index.php-setup' );
  99
 100 # Send Ajax requests to the Ajax dispatcher.
 101 if ( $wgUseAjax && $action == 'ajax' ) {
 102         $dispatcher = new AjaxDispatcher();
 103         $dispatcher->performAction();
 104         wfProfileOut( 'index.php' );
 105         $mediaWiki->restInPeace();
 106         exit;
 107 }
 108
 109 if ( $wgUseFileCache && $wgTitle !== null ) {
 110         wfProfileIn( 'index.php-filecache' );
 111         // Raw pages should handle cache control on their own,
 112         // even when using file cache. This reduces hits from clients.
 113         if ( $action != 'raw' && HTMLFileCache::useFileCache() ) {
 114                 /* Try low-level file cache hit */
 115                 $cache = new HTMLFileCache( $wgTitle, $action );
 116                 if ( $cache->isFileCacheGood( /* Assume up to date */ ) ) {
 117                         /* Check incoming headers to see if client has this cached */
 118                         if ( !$context->output->checkLastModified( $cache->fileCacheTime() ) ) {
 119                                 $cache->loadFromFileCache();
 120                         }
 121                         # Do any stats increment/watchlist stuff
 122                         $wgArticle = MediaWiki::articleFromTitle( $wgTitle, $context );
 123                         $wgArticle->viewUpdates();
 124                         # Tell OutputPage that output is taken care of
 125                         $context->output->disable();
 126                         wfProfileOut( 'index.php-filecache' );
 127                         $mediaWiki->finalCleanup();
 128                         wfProfileOut( 'index.php' );
 129                         $mediaWiki->restInPeace();
 130                         exit;
 131                 }
 132         }
 133         wfProfileOut( 'index.php-filecache' );
 134 }
 135
 136 # Setting global variables in mediaWiki
 137 $mediaWiki->setVal( 'DisableHardRedirects', $wgDisableHardRedirects );
 138 $mediaWiki->setVal( 'EnableCreativeCommonsRdf', $wgEnableCreativeCommonsRdf );
 139 $mediaWiki->setVal( 'EnableDublinCoreRdf', $wgEnableDublinCoreRdf );
 140 $mediaWiki->setVal( 'Server', $wgServer );
 141 $mediaWiki->setVal( 'SquidMaxage', $wgSquidMaxage );
 142 $mediaWiki->setVal( 'UseExternalEditor', $wgUseExternalEditor );
 143 $mediaWiki->setVal( 'UsePathInfo', $wgUsePathInfo );
 144
 145 $mediaWiki->performRequestForTitle( $wgArticle );
 146 $mediaWiki->finalCleanup();
 147
 148 wfProfileOut( 'index.php' );
 149
 150 $mediaWiki->restInPeace();
 151
 152 /**
 153  * Display something vaguely comprehensible in the event of a totally unrecoverable error.
 154  * Does not assume access to *anything*; no globals, no autloader, no database, no localisation.
 155  * Safe for PHP4 (and putting this here means that WebStart.php and GlobalSettings.php
 156  * no longer need to be).
 157  *
 158  * Calling this function kills execution immediately.
 159  *
 160  * @param $errorMsg String fully-escaped HTML
 161  */
 162 function wfDie( $errorMsg ){
 163         // Use the version set in DefaultSettings if possible, but don't rely on it
 164         global $wgVersion, $wgLogo;
 165         $version = isset( $wgVersion ) && $wgVersion
 166                 ? htmlspecialchars( $wgVersion )
 167                 : '';
 168         $logo = isset( $wgLogo ) && $wgLogo
 169                 ? $wgLogo
 170                 : 'http://upload.wikimedia.org/wikipedia/commons/1/1c/MediaWiki_logo.png';
 171
 172         header( $_SERVER['SERVER_PROTOCOL'] . ' 500 MediaWiki configuration Error', true, 500 );
 173
 174         ?>
 175 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 176 <html xmlns='http://www.w3.org/1999/xhtml' lang='en'>
 177         <head>
 178                 <title>MediaWiki <?php echo $version; ?></title>
 179                 <meta http-equiv='Content-Type' content='text/html; charset=utf-8' />
 180                 <style type='text/css' media='screen'>
 181                         body {
 182                                 color: #000;
 183                                 background-color: #fff;
 184                                 font-family: sans-serif;
 185                                 padding: 2em;
 186                                 text-align: center;
 187                         }
 188                         p, img, h1 {
 189                                 text-align: left;
 190                                 margin: 0.5em 0;
 191                         }
 192                         h1 {
 193                                 font-size: 120%;
 194                         }
 195                 </style>
 196         </head>
 197         <body>
 198                 <img src="<?php echo $logo; ?>" alt='The MediaWiki logo' />
 199                 <h1>MediaWiki <?php echo $version; ?> internal error</h1>
 200                 <div class='error'> <?php echo $errorMsg; ?> </div>
 201         </body>
 202 </html>
 203         <?php
 204         die( 1 );
 205 }