includes/WebStart.php

   1 <?php
   2 /**
   3  * This does the initial set up for a web request.
   4  *
   5  * It does some security checks, loads autoloaders, constants, and
   6  * global functions, starts the profiler, loads the configuration,
   7  * and loads Setup.php, which loads extensions using the extension
   8  * registration system and initializes the application's global state.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  *
  25  * @file
  26  */
  27
  28 if ( ini_get( 'mbstring.func_overload' ) ) {
  29         die( 'MediaWiki does not support installations where mbstring.func_overload is non-zero.' );
  30 }
  31
  32 # T17461: Make IE8 turn off content sniffing. Everybody else should ignore this
  33 # We're adding it here so that it's *always* set, even for alternate entry
  34 # points and when $wgOut gets disabled or overridden.
  35 header( 'X-Content-Type-Options: nosniff' );
  36
  37 /**
  38  * @var float Request start time as fractional seconds since epoch
  39  * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
  40  *   WebRequest::getElapsedTime() instead.
  41  */
  42 $wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];
  43
  44 unset( $IP );
  45
  46 # Valid web server entry point, enable includes.
  47 # Please don't move this line to includes/Defines.php. This line essentially
  48 # defines a valid entry point. If you put it in includes/Defines.php, then
  49 # any script that includes it becomes an entry point, thereby defeating
  50 # its purpose.
  51 define( 'MEDIAWIKI', true );
  52
  53 # Full path to working directory.
  54 # Makes it possible to for example to have effective exclude path in apc.
  55 # __DIR__ breaks symlinked includes, but realpath() returns false
  56 # if we don't have permissions on parent directories.
  57 $IP = getenv( 'MW_INSTALL_PATH' );
  58 if ( $IP === false ) {
  59         $IP = realpath( '.' ) ?: dirname( __DIR__ );
  60 }
  61
  62 # Grab profiling functions
  63 require_once "$IP/includes/profiler/ProfilerFunctions.php";
  64
  65 # Start the autoloader, so that extensions can derive classes from core files
  66 require_once "$IP/includes/AutoLoader.php";
  67
  68 # Load up some global defines.
  69 require_once "$IP/includes/Defines.php";
  70
  71 # Start the profiler
  72 $wgProfiler = [];
  73 if ( file_exists( "$IP/StartProfiler.php" ) ) {
  74         require "$IP/StartProfiler.php";
  75 }
  76
  77 # Load default settings
  78 require_once "$IP/includes/DefaultSettings.php";
  79
  80 # Load global functions
  81 require_once "$IP/includes/GlobalFunctions.php";
  82
  83 # Load composer's autoloader if present
  84 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
  85         require_once "$IP/vendor/autoload.php";
  86 }
  87
  88 # Assert that composer dependencies were successfully loaded
  89 # Purposely no leading \ due to it breaking HHVM RepoAuthorative mode
  90 # PHP works fine with both versions
  91 # See https://github.com/facebook/hhvm/issues/5833
  92 if ( !interface_exists( 'Psr\Log\LoggerInterface' ) ) {
  93         $message = (
  94                 'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
  95                 "library</a> to be present. This library is not embedded directly in MediaWiki's " .
  96                 "git repository and must be installed separately by the end user.\n\n" .
  97                 'Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
  98                 '#Fetch_external_libraries">mediawiki.org</a> for help on installing ' .
  99                 'the required components.'
 100         );
 101         echo $message;
 102         trigger_error( $message, E_USER_ERROR );
 103         die( 1 );
 104 }
 105
 106 # Install a header callback
 107 MediaWiki\HeaderCallback::register();
 108
 109 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 110         # Use a callback function to configure MediaWiki
 111         call_user_func( MW_CONFIG_CALLBACK );
 112 } else {
 113         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 114                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
 115         }
 116
 117         # LocalSettings.php is the per site customization file. If it does not exist
 118         # the wiki installer needs to be launched or the generated file uploaded to
 119         # the root wiki directory. Give a hint, if it is not readable by the server.
 120         if ( !is_readable( MW_CONFIG_FILE ) ) {
 121                 require_once "$IP/includes/NoLocalSettings.php";
 122                 die();
 123         }
 124
 125         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 126         require_once MW_CONFIG_FILE;
 127 }
 128
 129 # Initialise output buffering
 130 # Check that there is no previous output or previously set up buffers, because
 131 # that would cause us to potentially mix gzip and non-gzip output, creating a
 132 # big mess.
 133 if ( ob_get_level() == 0 ) {
 134         require_once "$IP/includes/OutputHandler.php";
 135         ob_start( 'wfOutputHandler' );
 136 }
 137
 138 require_once "$IP/includes/Setup.php";
 139
 140 # Multiple DBs or commits might be used; keep the request as transactional as possible
 141 if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {
 142         ignore_user_abort( true );
 143 }
 144
 145 if ( !defined( 'MW_API' ) &&
 146         RequestContext::getMain()->getRequest()->getHeader( 'Promise-Non-Write-API-Action' )
 147 ) {
 148         header( 'Cache-Control: no-cache' );
 149         header( 'Content-Type: text/html; charset=utf-8' );
 150         HttpStatus::header( 400 );
 151         $error = wfMessage( 'nonwrite-api-promise-error' )->escaped();
 152         $content = <<<EOT
 153 <!DOCTYPE html>
 154 <html>
 155 <head><meta charset="UTF-8" /></head>
 156 <body>
 157 $error
 158 </body>
 159 </html>
 160
 161 EOT;
 162         header( 'Content-Length: ' . strlen( $content ) );
 163         echo $content;
 164         die();
 165 }