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(), '5.2.3' ) < 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
  67 require ( dirname( __FILE__ ) . '/includes/WebStart.php' );
  68
  69 try {
  70         wfIndexMain();
  71 } catch ( Exception $e ) {
  72         MWExceptionHandler::handle( $e );
  73 }
  74
  75 function wfIndexMain() {
  76         global $wgRequest, $wgShowHostnames, $mediaWiki, $wgTitle, $wgUseAjax, $wgUseFileCache;
  77
  78         wfProfileIn( 'index.php' );
  79         wfProfileIn( 'index.php-setup' );
  80
  81         $maxLag = $wgRequest->getVal( 'maxlag' );
  82         if ( !is_null( $maxLag ) ) {
  83                 $lb = wfGetLB(); // foo()->bar() is not supported in PHP4
  84                 list( $host, $lag ) = $lb->getMaxLag();
  85                 if ( $lag > $maxLag ) {
  86                         header( 'HTTP/1.1 503 Service Unavailable' );
  87                         header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
  88                         header( 'X-Database-Lag: ' . intval( $lag ) );
  89                         header( 'Content-Type: text/plain' );
  90                         if( $wgShowHostnames ) {
  91                                 echo "Waiting for $host: $lag seconds lagged\n";
  92                         } else {
  93                                 echo "Waiting for a database server: $lag seconds lagged\n";
  94                         }
  95                         return;
  96                 }
  97         }
  98
  99         # Initialize MediaWiki base class
 100         $context = RequestContext::getMain();
 101         $mediaWiki = new MediaWiki( $context );
 102
 103         # Set title from request parameters
 104         $wgTitle = $mediaWiki->getTitle();
 105         $action = $wgRequest->getVal( 'action', 'view' );
 106
 107         wfProfileOut( 'index.php-setup' );
 108
 109         # Send Ajax requests to the Ajax dispatcher.
 110         if ( $wgUseAjax && $action == 'ajax' ) {
 111                 $dispatcher = new AjaxDispatcher();
 112                 $dispatcher->performAction();
 113                 wfProfileOut( 'index.php' );
 114                 $mediaWiki->restInPeace();
 115                 return;
 116         }
 117
 118         if ( $wgUseFileCache && $wgTitle !== null ) {
 119                 wfProfileIn( 'index.php-filecache' );
 120                 // Raw pages should handle cache control on their own,
 121                 // even when using file cache. This reduces hits from clients.
 122                 if ( $action != 'raw' && HTMLFileCache::useFileCache() ) {
 123                         /* Try low-level file cache hit */
 124                         $cache = new HTMLFileCache( $wgTitle, $action );
 125                         if ( $cache->isFileCacheGood( /* Assume up to date */ ) ) {
 126                                 /* Check incoming headers to see if client has this cached */
 127                                 if ( !$context->output->checkLastModified( $cache->fileCacheTime() ) ) {
 128                                         $cache->loadFromFileCache();
 129                                 }
 130                                 # Do any stats increment/watchlist stuff
 131                                 $article = Article::newFromTitle( $wgTitle, $context );
 132                                 $article->viewUpdates();
 133                                 # Tell OutputPage that output is taken care of
 134                                 $context->output->disable();
 135                                 wfProfileOut( 'index.php-filecache' );
 136                                 $mediaWiki->finalCleanup();
 137                                 wfProfileOut( 'index.php' );
 138                                 $mediaWiki->restInPeace();
 139                                 return;
 140                         }
 141                 }
 142                 wfProfileOut( 'index.php-filecache' );
 143         }
 144
 145         /**
 146          * $wgArticle is deprecated, do not use it. This will possibly be removed
 147          * entirely in 1.20 or 1.21
 148          * @deprecated since 1.19
 149          */
 150         global $wgArticle;
 151
 152         $wgArticle = $mediaWiki->performRequest();
 153
 154         $mediaWiki->finalCleanup();
 155
 156         wfProfileOut( 'index.php' );
 157
 158         $mediaWiki->restInPeace();
 159 }
 160
 161 /**
 162  * Display something vaguely comprehensible in the event of a totally unrecoverable error.
 163  * Does not assume access to *anything*; no globals, no autloader, no database, no localisation.
 164  * Safe for PHP4 (and putting this here means that WebStart.php and GlobalSettings.php
 165  * no longer need to be).
 166  *
 167  * Calling this function kills execution immediately.
 168  *
 169  * @param $errorMsg String fully-escaped HTML
 170  */
 171 function wfDie( $errorMsg ){
 172         // Use the version set in DefaultSettings if possible, but don't rely on it
 173         global $wgVersion, $wgLogo;
 174         $version = isset( $wgVersion ) && $wgVersion
 175                 ? htmlspecialchars( $wgVersion )
 176                 : '';
 177         $logo = isset( $wgLogo ) && $wgLogo
 178                 ? $wgLogo
 179                 : 'http://upload.wikimedia.org/wikipedia/commons/1/1c/MediaWiki_logo.png';
 180
 181         header( $_SERVER['SERVER_PROTOCOL'] . ' 500 MediaWiki configuration Error', true, 500 );
 182         header( 'Content-type: text/html; charset=UTF-8' );
 183         // Don't cache error pages!  They cause no end of trouble...
 184         header( 'Cache-control: none' );
 185         header( 'Pragma: nocache' );
 186
 187         ?>
 188 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 189 <html xmlns='http://www.w3.org/1999/xhtml' lang='en'>
 190         <head>
 191                 <title>MediaWiki <?php echo $version; ?></title>
 192                 <meta http-equiv='Content-Type' content='text/html; charset=utf-8' />
 193                 <style type='text/css' media='screen'>
 194                         body {
 195                                 color: #000;
 196                                 background-color: #fff;
 197                                 font-family: sans-serif;
 198                                 padding: 2em;
 199                                 text-align: center;
 200                         }
 201                         p, img, h1 {
 202                                 text-align: left;
 203                                 margin: 0.5em 0;
 204                         }
 205                         h1 {
 206                                 font-size: 120%;
 207                         }
 208                 </style>
 209         </head>
 210         <body>
 211                 <img src="<?php echo $logo; ?>" alt='The MediaWiki logo' />
 212                 <h1>MediaWiki <?php echo $version; ?> internal error</h1>
 213                 <div class='error'> <?php echo $errorMsg; ?> </div>
 214         </body>
 215 </html>
 216         <?php
 217         die( 1 );
 218 }