WebStart.php
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WebStart.php
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	<?php
	/**
	* The set up for all MediaWiki web requests.
	*
	* It does:
	* - web-related security checks,
	* - decide how and from where to load site configuration (LocalSettings.php),
	* - load Setup.php.
	*
	* 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
	*/

	use MediaWiki\Context\RequestContext;
	use MediaWiki\Settings\SettingsBuilder;

	# T17461: 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' );

	# 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 );

	/**
	* @param SettingsBuilder $settings
	* @return never
	*/
	function wfWebStartNoLocalSettings( SettingsBuilder $settings ) {
	# 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.
	require_once __DIR__ . '/Output/NoLocalSettings.php';
	die();
	}

	require_once __DIR__ . '/BootstrapHelperFunctions.php';

	// If no LocalSettings file exists, try to display an error page
	// (use a callback because it depends on TemplateParser)
	if ( !defined( 'MW_CONFIG_CALLBACK' ) ) {
	wfDetectLocalSettingsFile();
	if ( !is_readable( MW_CONFIG_FILE ) ) {
	define( 'MW_CONFIG_CALLBACK', 'wfWebStartNoLocalSettings' );
	}
	}

	function wfWebStartSetup( SettingsBuilder $settings ) {
	// Initialize the default MediaWiki output buffering if no buffer is already active.
	// This avoids clashes with existing buffers in order to avoid problems,
	// like mixing gzip and non-gzip output.
	if ( ob_get_level() == 0 ) {
	// During HTTP requests, MediaWiki normally buffers the response body in a string
	// within OutputPage and prints it when ready. PHP buffers provide protection against
	// premature sending of HTTP headers due to output from PHP warnings and notices.
	// They also can be used to implement gzip support in PHP without the webserver knowing
	// which requests yield HTML and which yield large files that can be streamed.
	ob_start( [ MediaWiki\Output\OutputHandler::class, 'handle' ] );
	}
	}

	// Custom setup for WebStart entry point
	if ( !defined( 'MW_SETUP_CALLBACK' ) ) {
	define( 'MW_SETUP_CALLBACK', 'wfWebStartSetup' );
	}

	require_once __DIR__ . '/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' ) && !defined( 'MW_REST_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 );
	$errorHtml = wfMessage( 'nonwrite-api-promise-error' )
	->useDatabase( false )
	->inContentLanguage()
	->escaped();
	$content = <<<HTML
	<!DOCTYPE html>
	<html>
	<head><meta charset="UTF-8" /><meta name="color-scheme" content="light dark" /></head>
	<body>
	$errorHtml
	</body>
	</html>

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

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