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 if ( ini_get( 'mbstring.func_overload' ) ) {
  30         die( 'MediaWiki does not support installations where mbstring.func_overload is non-zero.' );
  31 }
  32
  33 # bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
  34 # We're adding it here so that it's *always* set, even for alternate entry
  35 # points and when $wgOut gets disabled or overridden.
  36 header( 'X-Content-Type-Options: nosniff' );
  37
  38 /**
  39  * @var float Request start time as fractional seconds since epoch
  40  * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
  41  *   WebRequest::getElapsedTime() instead.
  42  */
  43 $wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];
  44
  45 unset( $IP );
  46
  47 # Valid web server entry point, enable includes.
  48 # Please don't move this line to includes/Defines.php. This line essentially
  49 # defines a valid entry point. If you put it in includes/Defines.php, then
  50 # any script that includes it becomes an entry point, thereby defeating
  51 # its purpose.
  52 define( 'MEDIAWIKI', true );
  53
  54 # Full path to working directory.
  55 # Makes it possible to for example to have effective exclude path in apc.
  56 # __DIR__ breaks symlinked includes, but realpath() returns false
  57 # if we don't have permissions on parent directories.
  58 $IP = getenv( 'MW_INSTALL_PATH' );
  59 if ( $IP === false ) {
  60         $IP = realpath( '.' ) ?: dirname( __DIR__ );
  61 }
  62
  63 # Grab profiling functions
  64 require_once "$IP/includes/profiler/ProfilerFunctions.php";
  65
  66 # Start the autoloader, so that extensions can derive classes from core files
  67 require_once "$IP/includes/AutoLoader.php";
  68
  69 # Load up some global defines.
  70 require_once "$IP/includes/Defines.php";
  71
  72 # Start the profiler
  73 $wgProfiler = [];
  74 if ( file_exists( "$IP/StartProfiler.php" ) ) {
  75         require "$IP/StartProfiler.php";
  76 }
  77
  78 # Load default settings
  79 require_once "$IP/includes/DefaultSettings.php";
  80
  81 # Load global functions
  82 require_once "$IP/includes/GlobalFunctions.php";
  83
  84 # Load composer's autoloader if present
  85 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
  86         require_once "$IP/vendor/autoload.php";
  87 }
  88
  89 # Assert that composer dependencies were successfully loaded
  90 # Purposely no leading \ due to it breaking HHVM RepoAuthorative mode
  91 # PHP works fine with both versions
  92 # See https://github.com/facebook/hhvm/issues/5833
  93 if ( !interface_exists( 'Psr\Log\LoggerInterface' ) ) {
  94         $message = (
  95                 'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
  96                 "library</a> to be present. This library is not embedded directly in MediaWiki's " .
  97                 "git repository and must be installed separately by the end user.\n\n" .
  98                 'Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
  99                 '#Fetch_external_libraries">mediawiki.org</a> for help on installing ' .
 100                 'the required components.'
 101         );
 102         echo $message;
 103         trigger_error( $message, E_USER_ERROR );
 104         die( 1 );
 105 }
 106
 107 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 108         # Use a callback function to configure MediaWiki
 109         call_user_func( MW_CONFIG_CALLBACK );
 110 } else {
 111         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 112                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
 113         }
 114
 115         # LocalSettings.php is the per site customization file. If it does not exist
 116         # the wiki installer needs to be launched or the generated file uploaded to
 117         # the root wiki directory. Give a hint, if it is not readable by the server.
 118         if ( !is_readable( MW_CONFIG_FILE ) ) {
 119                 require_once "$IP/includes/NoLocalSettings.php";
 120                 die();
 121         }
 122
 123         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 124         require_once MW_CONFIG_FILE;
 125 }
 126
 127 # Initialise output buffering
 128 # Check that there is no previous output or previously set up buffers, because
 129 # that would cause us to potentially mix gzip and non-gzip output, creating a
 130 # big mess.
 131 if ( ob_get_level() == 0 ) {
 132         require_once "$IP/includes/OutputHandler.php";
 133         ob_start( 'wfOutputHandler' );
 134 }
 135
 136 if ( !defined( 'MW_NO_SETUP' ) ) {
 137         require_once "$IP/includes/Setup.php";
 138 }
 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 }