wikimedia / mediawiki

includes/WebStart.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 52 and the first side effect is on line 30.

/**
 * This does the initial set up for a web request.
 * It does some security checks, starts the profiler and loads the
 * configuration, and optionally loads Setup.php depending on whether
 * MW_NO_SETUP is defined.
 *
 * Setup.php (if loaded) then sets up GlobalFunctions, the AutoLoader,
 * and the configuration globals.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

if ( ini_get( 'mbstring.func_overload' ) ) {
	die( 'MediaWiki does not support installations where mbstring.func_overload is non-zero.' );
}

# bug 15461: Make IE8 turn off content sniffing. Everybody else should ignore this
# We're adding it here so that it's *always* set, even for alternate entry
# points and when $wgOut gets disabled or overridden.
header( 'X-Content-Type-Options: nosniff' );

/**
 * @var float Request start time as fractional seconds since epoch
 * @deprecated since 1.25; use $_SERVER['REQUEST_TIME_FLOAT'] or
 *   WebRequest::getElapsedTime() instead.
 */
$wgRequestTime = $_SERVER['REQUEST_TIME_FLOAT'];

unset( $IP );

# Valid web server entry point, enable includes.
# Please don't move this line to includes/Defines.php. This line essentially
# defines a valid entry point. If you put it in includes/Defines.php, then
# any script that includes it becomes an entry point, thereby defeating
# its purpose.
define( 'MEDIAWIKI', true );

# Full path to working directory.
# Makes it possible to for example to have effective exclude path in apc.
# __DIR__ breaks symlinked includes, but realpath() returns false
# if we don't have permissions on parent directories.
$IP = getenv( 'MW_INSTALL_PATH' );
if ( $IP === false ) {
	$IP = realpath( '.' ) ?: dirname( __DIR__ );
}

# Grab profiling functions
require_once "$IP/includes/profiler/ProfilerFunctions.php";

# Start the autoloader, so that extensions can derive classes from core files
require_once "$IP/includes/AutoLoader.php";

# Load up some global defines.
require_once "$IP/includes/Defines.php";

# Start the profiler
$wgProfiler = [];
if ( file_exists( "$IP/StartProfiler.php" ) ) {
	require "$IP/StartProfiler.php";
}

# Load default settings
require_once "$IP/includes/DefaultSettings.php";

# Load global functions
require_once "$IP/includes/GlobalFunctions.php";

# Load composer's autoloader if present
if ( is_readable( "$IP/vendor/autoload.php" ) ) {
	require_once "$IP/vendor/autoload.php";
}

# Assert that composer dependencies were successfully loaded
# Purposely no leading \ due to it breaking HHVM RepoAuthorative mode
# PHP works fine with both versions
# See https://github.com/facebook/hhvm/issues/5833
if ( !interface_exists( 'Psr\Log\LoggerInterface' ) ) {
	$message = (
		'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
		"library</a> to be present. This library is not embedded directly in MediaWiki's " .
		"git repository and must be installed separately by the end user.\n\n" .
		'Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
		'#Fetch_external_libraries">mediawiki.org</a> for help on installing ' .
		'the required components.'
	);
	echo $message;
	trigger_error( $message, E_USER_ERROR );
	die( 1 );
}

if ( defined( 'MW_CONFIG_CALLBACK' ) ) {
	# Use a callback function to configure MediaWiki
	call_user_func( MW_CONFIG_CALLBACK );
} else {
	if ( !defined( 'MW_CONFIG_FILE' ) ) {
		define( 'MW_CONFIG_FILE', "$IP/LocalSettings.php" );
	}

	# LocalSettings.php is the per site customization file. If it does not exist
	# the wiki installer needs to be launched or the generated file uploaded to
	# the root wiki directory. Give a hint, if it is not readable by the server.
	if ( !is_readable( MW_CONFIG_FILE ) ) {
		require_once "$IP/includes/NoLocalSettings.php";
		die();
	}

	# Include site settings. $IP may be changed (hopefully before the AutoLoader is invoked)
	require_once MW_CONFIG_FILE;
}

# Initialise output buffering
# Check that there is no previous output or previously set up buffers, because
# that would cause us to potentially mix gzip and non-gzip output, creating a
# big mess.
if ( ob_get_level() == 0 ) {
	require_once "$IP/includes/OutputHandler.php";
	ob_start( 'wfOutputHandler' );
}

if ( !defined( 'MW_NO_SETUP' ) ) {
	require_once "$IP/includes/Setup.php";
}

# Multiple DBs or commits might be used; keep the request as transactional as possible
if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] === 'POST' ) {
	ignore_user_abort( true );
}

if ( !defined( 'MW_API' ) &&
	RequestContext::getMain()->getRequest()->getHeader( 'Promise-Non-Write-API-Action' )
) {
	header( 'Cache-Control: no-cache' );
	header( 'Content-Type: text/html; charset=utf-8' );
	HttpStatus::header( 400 );
	$error = wfMessage( 'nonwrite-api-promise-error' )->escaped();
	$content = <<<EOT
<!DOCTYPE html>
<html>
<head><meta charset="UTF-8" /></head>
<body>
$error
</body>
</html>

EOT;
	header( 'Content-Length: ' . strlen( $content ) );
	echo $content;
	die();
}