includes/WebStart.php

   1 <?php
   2 /**
   3  * This does the initial set up for a web request.
   4  * It does some security checks, starts the profiler and loads the
   5  * configuration, and optionally loads Setup.php depending on whether
   6  * MW_NO_SETUP is defined.
   7  *
   8  * Setup.php (if loaded) then sets up GlobalFunctions, the AutoLoader,
   9  * and the configuration globals.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  24  * http://www.gnu.org/copyleft/gpl.html
  25  *
  26  * @file
  27  */
  28
  29 # Die if register_globals is enabled (PHP <=5.3)
  30 # This must be done before any globals are set by the code
  31 if ( ini_get( 'register_globals' ) ) {
  32         die( 'MediaWiki does not support installations where register_globals is enabled. Please see '
  33                 . '<a href="https://www.mediawiki.org/wiki/register_globals">mediawiki.org</a> '
  34                 . 'for help on how to disable it.' );
  35 }
  36
  37 if ( function_exists( 'get_magic_quotes_gpc' ) && get_magic_quotes_gpc() ) {
  38         die( 'MediaWiki does not function when magic quotes are enabled. Please see the '
  39                 . '<a href="https://php.net/manual/security.magicquotes.disabling.php">PHP Manual</a> '
  40                 . 'for help on how to disable magic quotes.' );
  41 }
  42
  43
  44 # bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
  45 # We're adding it here so that it's *always* set, even for alternate entry
  46 # points and when $wgOut gets disabled or overridden.
  47 header( 'X-Content-Type-Options: nosniff' );
  48
  49 # Approximate $_SERVER['REQUEST_TIME_FLOAT'] for PHP<5.4
  50 if ( !isset( $_SERVER['REQUEST_TIME_FLOAT'] ) ) {
  51         $_SERVER['REQUEST_TIME_FLOAT'] = microtime( true );
  52 }
  53
  54 /**
  55  * @var float Request start time as fractional seconds since epoch
  56  * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
  57  *   WebRequest::getElapsedTime() instead.
  58  */
  59 $wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];
  60
  61 unset( $IP );
  62
  63 # Valid web server entry point, enable includes.
  64 # Please don't move this line to includes/Defines.php. This line essentially
  65 # defines a valid entry point. If you put it in includes/Defines.php, then
  66 # any script that includes it becomes an entry point, thereby defeating
  67 # its purpose.
  68 define( 'MEDIAWIKI', true );
  69
  70 # Full path to working directory.
  71 # Makes it possible to for example to have effective exclude path in apc.
  72 # __DIR__ breaks symlinked includes, but realpath() returns false
  73 # if we don't have permissions on parent directories.
  74 $IP = getenv( 'MW_INSTALL_PATH' );
  75 if ( $IP === false ) {
  76         $IP = realpath( '.' ) ?: dirname( __DIR__ );
  77 }
  78
  79 # Grab profiling functions
  80 require_once "$IP/includes/profiler/ProfilerFunctions.php";
  81
  82 # Start the autoloader, so that extensions can derive classes from core files
  83 require_once "$IP/includes/AutoLoader.php";
  84
  85 # Load up some global defines.
  86 require_once "$IP/includes/Defines.php";
  87
  88 # Start the profiler
  89 $wgProfiler = array();
  90 if ( file_exists( "$IP/StartProfiler.php" ) ) {
  91         require "$IP/StartProfiler.php";
  92 }
  93
  94
  95 # Load default settings
  96 require_once "$IP/includes/DefaultSettings.php";
  97
  98 # Load global functions
  99 require_once "$IP/includes/GlobalFunctions.php";
 100
 101 # Load composer's autoloader if present
 102 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
 103         require_once "$IP/vendor/autoload.php";
 104 }
 105
 106 # Assert that composer dependencies were successfully loaded
 107 # Purposely no leading \ due to it breaking HHVM RepoAuthorative mode
 108 # PHP works fine with both versions
 109 # See https://github.com/facebook/hhvm/issues/5833
 110 if ( !interface_exists( 'Psr\Log\LoggerInterface' ) ) {
 111         $message = (
 112                 'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
 113                 "library</a> to be present. This library is not embedded directly in MediaWiki's " .
 114                 "git repository and must be installed separately by the end user.\n\n" .
 115                 'Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
 116                 '#Fetch_external_libraries">mediawiki.org</a> for help on installing ' .
 117                 'the required components.'
 118         );
 119         echo $message;
 120         trigger_error( $message, E_USER_ERROR );
 121         die( 1 );
 122 }
 123
 124 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 125         # Use a callback function to configure MediaWiki
 126         call_user_func( MW_CONFIG_CALLBACK );
 127 } else {
 128         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 129                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
 130         }
 131
 132         # LocalSettings.php is the per site customization file. If it does not exist
 133         # the wiki installer needs to be launched or the generated file uploaded to
 134         # the root wiki directory. Give a hint, if it is not readable by the server.
 135         if ( !is_readable( MW_CONFIG_FILE ) ) {
 136                 require_once "$IP/includes/NoLocalSettings.php";
 137                 die();
 138         }
 139
 140         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 141         require_once MW_CONFIG_FILE;
 142 }
 143
 144
 145 # Initialise output buffering
 146 # Check that there is no previous output or previously set up buffers, because
 147 # that would cause us to potentially mix gzip and non-gzip output, creating a
 148 # big mess.
 149 if ( ob_get_level() == 0 ) {
 150         require_once "$IP/includes/OutputHandler.php";
 151         ob_start( 'wfOutputHandler' );
 152 }
 153
 154 if ( !defined( 'MW_NO_SETUP' ) ) {
 155         require_once "$IP/includes/Setup.php";
 156 }
 157
 158 # Multiple DBs or commits might be used; keep the request as transactional as possible
 159 if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {
 160         ignore_user_abort( true );
 161 }
 162
 163 if ( !defined( 'MW_API' ) &&
 164         RequestContext::getMain()->getRequest()->getHeader( 'Promise-Non-Write-API-Action' )
 165 ) {
 166         header( 'Cache-Control: no-cache' );
 167         header( 'Content-Type: text/html; charset=utf-8' );
 168         HttpStatus::header( 400 );
 169         $error = wfMessage( 'nonwrite-api-promise-error' )->escaped();
 170         $content = <<<EOT
 171 <!DOCTYPE html>
 172 <html>
 173 <head><meta charset="UTF-8" /></head>
 174 <body>
 175 $error
 176 </body>
 177 </html>
 178
 179 EOT;
 180         header( 'Content-Length: ' . strlen( $content ) );
 181         echo $content;
 182         die();
 183 }