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   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 (though not $wgTitle).
  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. '
  33          . 'Please see <a href="https://www.mediawiki.org/wiki/register_globals">mediawiki.org</a> '
  34          . 'for help on how to disable it.' );
  35  }
  36  
  37  # bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
  38  # We're adding it here so that it's *always* set, even for alternate entry
  39  # points and when $wgOut gets disabled or overridden.
  40  header( 'X-Content-Type-Options: nosniff' );
  41  
  42  $wgRequestTime = microtime( true );
  43  unset( $IP );
  44  
  45  # Valid web server entry point, enable includes.
  46  # Please don't move this line to includes/Defines.php. This line essentially
  47  # defines a valid entry point. If you put it in includes/Defines.php, then
  48  # any script that includes it becomes an entry point, thereby defeating
  49  # its purpose.
  50  define( 'MEDIAWIKI', true );
  51  
  52  # Full path to working directory.
  53  # Makes it possible to for example to have effective exclude path in apc.
  54  # __DIR__ breaks symlinked includes, but realpath() returns false
  55  # if we don't have permissions on parent directories.
  56  $IP = getenv( 'MW_INSTALL_PATH' );
  57  if ( $IP === false ) {
  58      $IP = realpath( '.' ) ?: dirname( __DIR__ );
  59  }
  60  
  61  # Load the profiler
  62  require_once "$IP/includes/profiler/Profiler.php";
  63  $wgRUstart = wfGetRusage() ?: array();
  64  
  65  # Start the autoloader, so that extensions can derive classes from core files
  66  require_once "$IP/includes/AutoLoader.php";
  67  
  68  # Load up some global defines.
  69  require_once "$IP/includes/Defines.php";
  70  
  71  # Start the profiler
  72  $wgProfiler = array();
  73  if ( file_exists( "$IP/StartProfiler.php" ) ) {
  74      require "$IP/StartProfiler.php";
  75  }
  76  
  77  wfProfileIn( 'WebStart.php-conf' );
  78  
  79  # Load default settings
  80  require_once "$IP/includes/DefaultSettings.php";
  81  
  82  # Load composer's autoloader if present
  83  if ( is_readable( "$IP/vendor/autoload.php" ) ) {
  84      require_once "$IP/vendor/autoload.php";
  85  }
  86  
  87  if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
  88      # Use a callback function to configure MediaWiki
  89      call_user_func( MW_CONFIG_CALLBACK );
  90  } else {
  91      if ( !defined( 'MW_CONFIG_FILE' ) ) {
  92          define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
  93      }
  94  
  95      # LocalSettings.php is the per site customization file. If it does not exist
  96      # the wiki installer needs to be launched or the generated file uploaded to
  97      # the root wiki directory. Give a hint, if it is not readable by the server.
  98      if ( !is_readable( MW_CONFIG_FILE ) ) {
  99          require_once "$IP/includes/templates/NoLocalSettings.php";
 100          die();
 101      }
 102  
 103      # Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
 104      require_once MW_CONFIG_FILE;
 105  }
 106  
 107  wfProfileOut( 'WebStart.php-conf' );
 108  
 109  wfProfileIn( 'WebStart.php-ob_start' );
 110  # Initialise output buffering
 111  # Check that there is no previous output or previously set up buffers, because
 112  # that would cause us to potentially mix gzip and non-gzip output, creating a
 113  # big mess.
 114  if ( !defined( 'MW_NO_OUTPUT_BUFFER' ) && ob_get_level() == 0 ) {
 115      require_once "$IP/includes/OutputHandler.php";
 116      ob_start( 'wfOutputHandler' );
 117  }
 118  wfProfileOut( 'WebStart.php-ob_start' );
 119  
 120  if ( !defined( 'MW_NO_SETUP' ) ) {
 121      require_once "$IP/includes/Setup.php";
 122  }