includes/WebStart.php

   1 <?php
   2 /**
   3  * This does the initial set up for a web request.
   4  *
   5  * It does some security checks, loads autoloaders, constants, and
   6  * global functions, starts the profiler, loads the configuration,
   7  * and loads Setup.php, which loads extensions using the extension
   8  * registration system and initializes the application's global state.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  *
  25  * @file
  26  */
  27
  28 if ( ini_get( 'mbstring.func_overload' ) ) {
  29         die( 'MediaWiki does not support installations where mbstring.func_overload is non-zero.' );
  30 }
  31
  32 # T17461: Make IE8 turn off content sniffing. Everybody else should ignore this
  33 # We're adding it here so that it's *always* set, even for alternate entry
  34 # points and when $wgOut gets disabled or overridden.
  35 header( 'X-Content-Type-Options: nosniff' );
  36
  37 /**
  38  * @var float Request start time as fractional seconds since epoch
  39  * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
  40  *   WebRequest::getElapsedTime() instead.
  41  */
  42 $wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];
  43
  44 unset( $IP );
  45
  46 # Valid web server entry point, enable includes.
  47 # Please don't move this line to includes/Defines.php. This line essentially
  48 # defines a valid entry point. If you put it in includes/Defines.php, then
  49 # any script that includes it becomes an entry point, thereby defeating
  50 # its purpose.
  51 define( 'MEDIAWIKI', true );
  52
  53 # Full path to working directory.
  54 # Makes it possible to for example to have effective exclude path in apc.
  55 # __DIR__ breaks symlinked includes, but realpath() returns false
  56 # if we don't have permissions on parent directories.
  57 $IP = getenv( 'MW_INSTALL_PATH' );
  58 if ( $IP === false ) {
  59         $IP = realpath( '.' ) ?: dirname( __DIR__ );
  60 }
  61
  62 // If no LocalSettings file exists, try to display an error page
  63 // (use a callback because it depends on TemplateParser)
  64 if ( !defined( 'MW_CONFIG_CALLBACK' ) ) {
  65         if ( !defined( 'MW_CONFIG_FILE' ) ) {
  66                 define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
  67         }
  68         if ( !is_readable( MW_CONFIG_FILE ) ) {
  69                 function wfWebStartNoLocalSettings() {
  70                         # LocalSettings.php is the per-site customization file. If it does not exist
  71                         # the wiki installer needs to be launched or the generated file uploaded to
  72                         # the root wiki directory. Give a hint, if it is not readable by the server.
  73                         global $IP;
  74                         require_once "$IP/includes/NoLocalSettings.php";
  75                         die();
  76                 }
  77                 define( 'MW_CONFIG_CALLBACK', 'wfWebStartNoLocalSettings' );
  78         }
  79 }
  80
  81 // Custom setup for WebStart entry point
  82 if ( !defined( 'MW_SETUP_CALLBACK' ) ) {
  83         function wfWebStartSetup() {
  84                 # Initialise output buffering
  85                 # Check that there is no previous output or previously set up buffers, because
  86                 # that would cause us to potentially mix gzip and non-gzip output, creating a
  87                 # big mess.
  88                 global $IP;
  89                 if ( ob_get_level() == 0 ) {
  90                         require_once "$IP/includes/OutputHandler.php";
  91                         ob_start( 'wfOutputHandler' );
  92                 }
  93         }
  94         define( 'MW_SETUP_CALLBACK', 'wfWebStartSetup' );
  95 }
  96
  97 require_once "$IP/includes/Setup.php";
  98
  99 # Multiple DBs or commits might be used; keep the request as transactional as possible
 100 if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {
 101         ignore_user_abort( true );
 102 }
 103
 104 if ( !defined( 'MW_API' ) &&
 105         RequestContext::getMain()->getRequest()->getHeader( 'Promise-Non-Write-API-Action' )
 106 ) {
 107         header( 'Cache-Control: no-cache' );
 108         header( 'Content-Type: text/html; charset=utf-8' );
 109         HttpStatus::header( 400 );
 110         $error = wfMessage( 'nonwrite-api-promise-error' )->escaped();
 111         $content = <<<EOT
 112 <!DOCTYPE html>
 113 <html>
 114 <head><meta charset="UTF-8" /></head>
 115 <body>
 116 $error
 117 </body>
 118 </html>
 119
 120 EOT;
 121         header( 'Content-Length: ' . strlen( $content ) );
 122         echo $content;
 123         die();
 124 }