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
  30 # bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
  31 # We're adding it here so that it's *always* set, even for alternate entry
  32 # points and when $wgOut gets disabled or overridden.
  33 header( 'X-Content-Type-Options: nosniff' );
  34
  35 # Approximate $_SERVER['REQUEST_TIME_FLOAT'] for PHP<5.4
  36 if ( !isset( $_SERVER['REQUEST_TIME_FLOAT'] ) ) {
  37         $_SERVER['REQUEST_TIME_FLOAT'] = microtime( true );
  38 }
  39
  40 /**
  41  * @var float Request start time as fractional seconds since epoch
  42  * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
  43  *   WebRequest::getElapsedTime() instead.
  44  */
  45 $wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];
  46
  47 unset( $IP );
  48
  49 # Valid web server entry point, enable includes.
  50 # Please don't move this line to includes/Defines.php. This line essentially
  51 # defines a valid entry point. If you put it in includes/Defines.php, then
  52 # any script that includes it becomes an entry point, thereby defeating
  53 # its purpose.
  54 define( 'MEDIAWIKI', true );
  55
  56 # Full path to working directory.
  57 # Makes it possible to for example to have effective exclude path in apc.
  58 # __DIR__ breaks symlinked includes, but realpath() returns false
  59 # if we don't have permissions on parent directories.
  60 $IP = getenv( 'MW_INSTALL_PATH' );
  61 if ( $IP === false ) {
  62         $IP = realpath( '.' ) ?: dirname( __DIR__ );
  63 }
  64
  65 # Grab profiling functions
  66 require_once "$IP/includes/profiler/ProfilerFunctions.php";
  67
  68 # Start the autoloader, so that extensions can derive classes from core files
  69 require_once "$IP/includes/AutoLoader.php";
  70
  71 # Load up some global defines.
  72 require_once "$IP/includes/Defines.php";
  73
  74 # Start the profiler
  75 $wgProfiler = array();
  76 if ( file_exists( "$IP/StartProfiler.php" ) ) {
  77         require "$IP/StartProfiler.php";
  78 }
  79
  80 # Load default settings
  81 require_once "$IP/includes/DefaultSettings.php";
  82
  83 # Load global functions
  84 require_once "$IP/includes/GlobalFunctions.php";
  85
  86 # Load composer's autoloader if present
  87 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
  88         require_once "$IP/vendor/autoload.php";
  89 }
  90
  91 # Assert that composer dependencies were successfully loaded
  92 # Purposely no leading \ due to it breaking HHVM RepoAuthorative mode
  93 # PHP works fine with both versions
  94 # See https://github.com/facebook/hhvm/issues/5833
  95 if ( !interface_exists( 'Psr\Log\LoggerInterface' ) ) {
  96         $message = (
  97                 'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
  98                 "library</a> to be present. This library is not embedded directly in MediaWiki's " .
  99                 "git repository and must be installed separately by the end user.\n\n" .
 100                 'Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
 101                 '#Fetch_external_libraries">mediawiki.org</a> for help on installing ' .
 102                 'the required components.'
 103         );
 104         echo $message;
 105         trigger_error( $message, E_USER_ERROR );
 106         die( 1 );
 107 }
 108
 109 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 110         # Use a callback function to configure MediaWiki
 111         call_user_func( MW_CONFIG_CALLBACK );
 112 } else {
 113         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 114                 define( 'MW_CONFIG_FILE', "$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 if ( !defined( 'MW_NO_SETUP' ) ) {
 139         require_once "$IP/includes/Setup.php";
 140 }
 141
 142 # Multiple DBs or commits might be used; keep the request as transactional as possible
 143 if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {
 144         ignore_user_abort( true );
 145 }
 146
 147 if ( !defined( 'MW_API' ) &&
 148         RequestContext::getMain()->getRequest()->getHeader( 'Promise-Non-Write-API-Action' )
 149 ) {
 150         header( 'Cache-Control: no-cache' );
 151         header( 'Content-Type: text/html; charset=utf-8' );
 152         HttpStatus::header( 400 );
 153         $error = wfMessage( 'nonwrite-api-promise-error' )->escaped();
 154         $content = <<<EOT
 155 <!DOCTYPE html>
 156 <html>
 157 <head><meta charset="UTF-8" /></head>
 158 <body>
 159 $error
 160 </body>
 161 </html>
 162
 163 EOT;
 164         header( 'Content-Length: ' . strlen( $content ) );
 165         echo $content;
 166         die();
 167 }