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 # bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
  44 # We're adding it here so that it's *always* set, even for alternate entry
  45 # points and when $wgOut gets disabled or overridden.
  46 header( 'X-Content-Type-Options: nosniff' );
  47
  48 # Approximate $_SERVER['REQUEST_TIME_FLOAT'] for PHP<5.4
  49 if ( !isset( $_SERVER['REQUEST_TIME_FLOAT'] ) ) {
  50         $_SERVER['REQUEST_TIME_FLOAT'] = microtime( true );
  51 }
  52
  53 /**
  54  * @var float Request start time as fractional seconds since epoch
  55  * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
  56  *   WebRequest::getElapsedTime() instead.
  57  */
  58 $wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];
  59
  60 unset( $IP );
  61
  62 # Valid web server entry point, enable includes.
  63 # Please don't move this line to includes/Defines.php. This line essentially
  64 # defines a valid entry point. If you put it in includes/Defines.php, then
  65 # any script that includes it becomes an entry point, thereby defeating
  66 # its purpose.
  67 define( 'MEDIAWIKI', true );
  68
  69 # Full path to working directory.
  70 # Makes it possible to for example to have effective exclude path in apc.
  71 # __DIR__ breaks symlinked includes, but realpath() returns false
  72 # if we don't have permissions on parent directories.
  73 $IP = getenv( 'MW_INSTALL_PATH' );
  74 if ( $IP === false ) {
  75         $IP = realpath( '.' ) ?: dirname( __DIR__ );
  76 }
  77
  78 # Grab profiling functions
  79 require_once "$IP/includes/profiler/ProfilerFunctions.php";
  80
  81 # Start the autoloader, so that extensions can derive classes from core files
  82 require_once "$IP/includes/AutoLoader.php";
  83
  84 # Load up some global defines.
  85 require_once "$IP/includes/Defines.php";
  86
  87 # Start the profiler
  88 $wgProfiler = array();
  89 if ( file_exists( "$IP/StartProfiler.php" ) ) {
  90         require "$IP/StartProfiler.php";
  91 }
  92
  93 # Load default settings
  94 require_once "$IP/includes/DefaultSettings.php";
  95
  96 # Load global functions
  97 require_once "$IP/includes/GlobalFunctions.php";
  98
  99 # Load composer's autoloader if present
 100 if ( is_readable( "$IP/vendor/autoload.php" ) ) {
 101         require_once "$IP/vendor/autoload.php";
 102 }
 103
 104 # Assert that composer dependencies were successfully loaded
 105 # Purposely no leading \ due to it breaking HHVM RepoAuthorative mode
 106 # PHP works fine with both versions
 107 # See https://github.com/facebook/hhvm/issues/5833
 108 if ( !interface_exists( 'Psr\Log\LoggerInterface' ) ) {
 109         $message = (
 110                 'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
 111                 "library</a> to be present. This library is not embedded directly in MediaWiki's " .
 112                 "git repository and must be installed separately by the end user.\n\n" .
 113                 'Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
 114                 '#Fetch_external_libraries">mediawiki.org</a> for help on installing ' .
 115                 'the required components.'
 116         );
 117         echo $message;
 118         trigger_error( $message, E_USER_ERROR );
 119         die( 1 );
 120 }
 121
 122 if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
 123         # Use a callback function to configure MediaWiki
 124         call_user_func( MW_CONFIG_CALLBACK );
 125 } else {
 126         if ( !defined( 'MW_CONFIG_FILE' ) ) {
 127                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
 128         }
 129
 130         # LocalSettings.php is the per site customization file. If it does not exist
 131         # the wiki installer needs to be launched or the generated file uploaded to
 132         # the root wiki directory. Give a hint, if it is not readable by the server.
 133         if ( !is_readable( MW_CONFIG_FILE ) ) {
 134                 require_once "$IP/includes/NoLocalSettings.php";
 135                 die();
 136         }
 137
 138         # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 139         require_once MW_CONFIG_FILE;
 140 }
 141
 142 # Initialise output buffering
 143 # Check that there is no previous output or previously set up buffers, because
 144 # that would cause us to potentially mix gzip and non-gzip output, creating a
 145 # big mess.
 146 if ( ob_get_level() == 0 ) {
 147         require_once "$IP/includes/OutputHandler.php";
 148         ob_start( 'wfOutputHandler' );
 149 }
 150
 151 if ( !defined( 'MW_NO_SETUP' ) ) {
 152         require_once "$IP/includes/Setup.php";
 153 }
 154
 155 # Multiple DBs or commits might be used; keep the request as transactional as possible
 156 if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {
 157         ignore_user_abort( true );
 158 }
 159
 160 if ( !defined( 'MW_API' ) &&
 161         RequestContext::getMain()->getRequest()->getHeader( 'Promise-Non-Write-API-Action' )
 162 ) {
 163         header( 'Cache-Control: no-cache' );
 164         header( 'Content-Type: text/html; charset=utf-8' );
 165         HttpStatus::header( 400 );
 166         $error = wfMessage( 'nonwrite-api-promise-error' )->escaped();
 167         $content = <<<EOT
 168 <!DOCTYPE html>
 169 <html>
 170 <head><meta charset="UTF-8" /></head>
 171 <body>
 172 $error
 173 </body>
 174 </html>
 175
 176 EOT;
 177         header( 'Content-Length: ' . strlen( $content ) );
 178         echo $content;
 179         die();
 180 }