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 // Load global constants, including MW_VERSION and MW_MIN_PHP_VERSION
  40 require_once( dirname( __FILE__ ) . '/includes/Defines.php' );
  41
  42 // Bail on old versions of PHP.  Pretty much every other file in the codebase
  43 // has structures (try/catch, foo()->bar(), etc etc) which throw parse errors in PHP 4.
  44 // Setup.php and ObjectCache.php have structures invalid in PHP 5.0 and 5.1, respectively.
  45 if ( !function_exists( 'version_compare' ) || version_compare( phpversion(), MW_MIN_PHP_VERSION ) < 0 ) {
  46         $phpversion = htmlspecialchars( phpversion() );
  47         $reqVersion = htmlspecialchars( MW_MIN_PHP_VERSION );
  48         $errorMsg = <<<ENDL
  49                 <p>
  50                         MediaWiki requires PHP $reqVersion or higher. You are running PHP $phpversion.
  51                 </p>
  52                 <p>
  53                         Please consider <a href="http://www.php.net/downloads.php">upgrading your copy of PHP</a>.
  54                         PHP versions less than 5.3.0 are no longer supported by the PHP Group and will not receive
  55                         security or bugfix updates.
  56                 </p>
  57                 <p>
  58                         If for some reason you are unable to upgrade your PHP version, you will need to
  59                         <a href="http://www.mediawiki.org/wiki/Download">download</a> an older version
  60                         of MediaWiki from our website.  See our
  61                         <a href="http://www.mediawiki.org/wiki/Compatibility#PHP">compatibility page</a>
  62                         for details of which versions are compatible with prior versions of PHP.
  63                 </p>
  64 ENDL;
  65         wfDie( $errorMsg );
  66 }
  67
  68 # Initialise common code.  This gives us access to GlobalFunctions, the AutoLoader, and
  69 # the globals $wgRequest, $wgOut, $wgUser, $wgLang and $wgContLang, amongst others; it
  70 # does *not* load $wgTitle or $wgArticle
  71 require ( dirname( __FILE__ ) . '/includes/WebStart.php' );
  72
  73 wfProfileIn( 'index.php' );
  74 wfProfileIn( 'index.php-setup' );
  75
  76 $maxLag = $wgRequest->getVal( 'maxlag' );
  77 if ( !is_null( $maxLag ) ) {
  78         $lb = wfGetLB(); // foo()->bar() is not supported in PHP4
  79         list( $host, $lag ) = $lb->getMaxLag();
  80         if ( $lag > $maxLag ) {
  81                 header( 'HTTP/1.1 503 Service Unavailable' );
  82                 header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
  83                 header( 'X-Database-Lag: ' . intval( $lag ) );
  84                 header( 'Content-Type: text/plain' );
  85                 if( $wgShowHostnames ) {
  86                         echo "Waiting for $host: $lag seconds lagged\n";
  87                 } else {
  88                         echo "Waiting for a database server: $lag seconds lagged\n";
  89                 }
  90                 exit;
  91         }
  92 }
  93
  94 # Initialize MediaWiki base class
  95 $context = RequestContext::getMain();
  96 $mediaWiki = new MediaWiki( $context );
  97
  98 # Set title from request parameters
  99 $wgTitle = $mediaWiki->getTitle();
 100 $action = $wgRequest->getVal( 'action', 'view' );
 101
 102 wfProfileOut( 'index.php-setup' );
 103
 104 # Send Ajax requests to the Ajax dispatcher.
 105 if ( $wgUseAjax && $action == 'ajax' ) {
 106         $dispatcher = new AjaxDispatcher();
 107         $dispatcher->performAction();
 108         wfProfileOut( 'index.php' );
 109         $mediaWiki->restInPeace();
 110         exit;
 111 }
 112
 113 if ( $wgUseFileCache && $wgTitle !== null ) {
 114         wfProfileIn( 'index.php-filecache' );
 115         // Raw pages should handle cache control on their own,
 116         // even when using file cache. This reduces hits from clients.
 117         if ( $action != 'raw' && HTMLFileCache::useFileCache() ) {
 118                 /* Try low-level file cache hit */
 119                 $cache = new HTMLFileCache( $wgTitle, $action );
 120                 if ( $cache->isFileCacheGood( /* Assume up to date */ ) ) {
 121                         /* Check incoming headers to see if client has this cached */
 122                         if ( !$context->output->checkLastModified( $cache->fileCacheTime() ) ) {
 123                                 $cache->loadFromFileCache();
 124                         }
 125                         # Do any stats increment/watchlist stuff
 126                         $wgArticle = MediaWiki::articleFromTitle( $wgTitle, $context );
 127                         $wgArticle->viewUpdates();
 128                         # Tell OutputPage that output is taken care of
 129                         $context->output->disable();
 130                         wfProfileOut( 'index.php-filecache' );
 131                         $mediaWiki->finalCleanup();
 132                         wfProfileOut( 'index.php' );
 133                         $mediaWiki->restInPeace();
 134                         exit;
 135                 }
 136         }
 137         wfProfileOut( 'index.php-filecache' );
 138 }
 139
 140 # Setting global variables in mediaWiki
 141 $mediaWiki->setVal( 'DisableHardRedirects', $wgDisableHardRedirects );
 142 $mediaWiki->setVal( 'EnableCreativeCommonsRdf', $wgEnableCreativeCommonsRdf );
 143 $mediaWiki->setVal( 'EnableDublinCoreRdf', $wgEnableDublinCoreRdf );
 144 $mediaWiki->setVal( 'Server', $wgServer );
 145 $mediaWiki->setVal( 'SquidMaxage', $wgSquidMaxage );
 146 $mediaWiki->setVal( 'UseExternalEditor', $wgUseExternalEditor );
 147 $mediaWiki->setVal( 'UsePathInfo', $wgUsePathInfo );
 148
 149 $mediaWiki->performRequestForTitle( $wgArticle );
 150 $mediaWiki->finalCleanup();
 151
 152 wfProfileOut( 'index.php' );
 153
 154 $mediaWiki->restInPeace();
 155
 156 /**
 157  * Display something vaguely comprehensible in the event of a totally unrecoverable error.
 158  * Does not assume access to *anything*; no globals, no autloader, no database, no localisation.
 159  * Safe for PHP4 (and putting this here means that WebStart.php and GlobalSettings.php
 160  * no longer need to be).
 161  *
 162  * Calling this function kills execution immediately.
 163  *
 164  * @param $errorMsg String fully-escaped HTML
 165  */
 166 function wfDie( $errorMsg ){
 167         global $wgLogo;
 168         $version = htmlspecialchars( MW_VERSION );
 169         $logo = isset( $wgLogo ) && $wgLogo
 170                 ? $wgLogo
 171                 : 'http://upload.wikimedia.org/wikipedia/commons/1/1c/MediaWiki_logo.png';
 172
 173         header( $_SERVER['SERVER_PROTOCOL'] . ' 500 MediaWiki configuration Error', true, 500 );
 174         header( 'Content-type: text/html; charset=UTF-8' );
 175         // Don't cache error pages!  They cause no end of trouble...
 176         header( 'Cache-control: none' );
 177         header( 'Pragma: nocache' );
 178
 179         ?>
 180 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 181 <html xmlns='http://www.w3.org/1999/xhtml' lang='en'>
 182         <head>
 183                 <title>MediaWiki <?php echo $version; ?></title>
 184                 <meta http-equiv='Content-Type' content='text/html; charset=utf-8' />
 185                 <style type='text/css' media='screen'>
 186                         body {
 187                                 color: #000;
 188                                 background-color: #fff;
 189                                 font-family: sans-serif;
 190                                 padding: 2em;
 191                                 text-align: center;
 192                         }
 193                         p, img, h1 {
 194                                 text-align: left;
 195                                 margin: 0.5em 0;
 196                         }
 197                         h1 {
 198                                 font-size: 120%;
 199                         }
 200                 </style>
 201         </head>
 202         <body>
 203                 <img src="<?php echo $logo; ?>" alt='The MediaWiki logo' />
 204                 <h1>MediaWiki <?php echo $version; ?> internal error</h1>
 205                 <div class='error'> <?php echo $errorMsg; ?> </div>
 206         </body>
 207 </html>
 208         <?php
 209         die( 1 );
 210 }