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 /**
  36  * @var float Request start time as fractional seconds since epoch
  37  * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
  38  *   WebRequest::getElapsedTime() instead.
  39  */
  40 $wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];
  41
  42 unset( $IP );
  43
  44 # Valid web server entry point, enable includes.
  45 # Please don't move this line to includes/Defines.php. This line essentially
  46 # defines a valid entry point. If you put it in includes/Defines.php, then
  47 # any script that includes it becomes an entry point, thereby defeating
  48 # its purpose.
  49 define( 'MEDIAWIKI', true );
  50
  51 # Full path to working directory.
  52 # Makes it possible to for example to have effective exclude path in apc.
  53 # __DIR__ breaks symlinked includes, but realpath() returns false
  54 # if we don't have permissions on parent directories.
  55 $IP = getenv( 'MW_INSTALL_PATH' );
  56 if ( $IP === false ) {
  57         $IP = realpath( '.' ) ?: dirname( __DIR__ );
  58 }
  59
  60 # Grab profiling functions
  61 require_once "$IP/includes/profiler/ProfilerFunctions.php";
  62
  63 # Start the autoloader, so that extensions can derive classes from core files
  64 require_once "$IP/includes/AutoLoader.php";
  65
  66 # Load up some global defines.
  67 require_once "$IP/includes/Defines.php";
  68
  69 # Start the profiler
  70 $wgProfiler = array();
  71 if ( file_exists( "$IP/StartProfiler.php" ) ) {
  72         require "$IP/StartProfiler.php";
  73 }
  74
  75 # Load default settings
  76 require_once "$IP/includes/DefaultSettings.php";
  77
  78 # Load global functions
  79 require_once "$IP/includes/GlobalFunctions.php";
  80
  81 # Load composer's autoloader if present
  82 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
  83         require_once "$IP/vendor/autoload.php";
  84 }
  85
  86 # Assert that composer dependencies were successfully loaded
  87 # Purposely no leading \ due to it breaking HHVM RepoAuthorative mode
  88 # PHP works fine with both versions
  89 # See https://github.com/facebook/hhvm/issues/5833
  90 if ( !interface_exists( 'Psr\Log\LoggerInterface' ) ) {
  91         $message = (
  92                 'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
  93                 "library</a> to be present. This library is not embedded directly in MediaWiki's " .
  94                 "git repository and must be installed separately by the end user.\n\n" .
  95                 'Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
  96                 '#Fetch_external_libraries">mediawiki.org</a> for help on installing ' .
  97                 'the required components.'
  98         );
  99         echo $message;
 100         trigger_error( $message, E_USER_ERROR );
 101         die( 1 );
 102 }
 103
 104 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 105         # Use a callback function to configure MediaWiki
 106         call_user_func( MW_CONFIG_CALLBACK );
 107 } else {
 108         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 109                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
 110         }
 111
 112         # LocalSettings.php is the per site customization file. If it does not exist
 113         # the wiki installer needs to be launched or the generated file uploaded to
 114         # the root wiki directory. Give a hint, if it is not readable by the server.
 115         if ( !is_readable( MW_CONFIG_FILE ) ) {
 116                 require_once "$IP/includes/NoLocalSettings.php";
 117                 die();
 118         }
 119
 120         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 121         require_once MW_CONFIG_FILE;
 122 }
 123
 124 # Initialise output buffering
 125 # Check that there is no previous output or previously set up buffers, because
 126 # that would cause us to potentially mix gzip and non-gzip output, creating a
 127 # big mess.
 128 if ( ob_get_level() == 0 ) {
 129         require_once "$IP/includes/OutputHandler.php";
 130         ob_start( 'wfOutputHandler' );
 131 }
 132
 133 if ( !defined( 'MW_NO_SETUP' ) ) {
 134         require_once "$IP/includes/Setup.php";
 135 }
 136
 137 # Multiple DBs or commits might be used; keep the request as transactional as possible
 138 if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {
 139         ignore_user_abort( true );
 140 }
 141
 142 if ( !defined( 'MW_API' ) &&
 143         RequestContext::getMain()->getRequest()->getHeader( 'Promise-Non-Write-API-Action' )
 144 ) {
 145         header( 'Cache-Control: no-cache' );
 146         header( 'Content-Type: text/html; charset=utf-8' );
 147         HttpStatus::header( 400 );
 148         $error = wfMessage( 'nonwrite-api-promise-error' )->escaped();
 149         $content = <<<EOT
 150 <!DOCTYPE html>
 151 <html>
 152 <head><meta charset="UTF-8" /></head>
 153 <body>
 154 $error
 155 </body>
 156 </html>
 157
 158 EOT;
 159         header( 'Content-Length: ' . strlen( $content ) );
 160         echo $content;
 161         die();
 162 }