silverstripe-framework/main.php

<?php

/************************************************************************************
 ************************************************************************************
 **                                                                                **
 **  If you can read this text in your browser then you don't have PHP installed.  **
 **  Please install PHP 5.3.3 or higher, preferably PHP 5.3.4+.                    **
 **                                                                                **
 ************************************************************************************
 ************************************************************************************/

/**
 * @package framework
 * @subpackage core
 */

if (version_compare(phpversion(), '5.3.3', '<')) {
	header("HTTP/1.1 500 Server Error");
	echo str_replace('$PHPVersion', phpversion(), file_get_contents("dev/install/php5-required.html"));
	die();
}

/**
 * Main file that handles every page request.
 *
 * The main.php does a number of set-up activities for the request.
 *
 *  - Includes the first one of the following files that it finds: (root)/_ss_environment.php,
 *    (root)/../_ss_environment.php, or (root)/../../_ss_environment.php
 *  - Gets an up-to-date manifest from {@link ManifestBuilder}
 *  - Sets up error handlers with {@link Debug::loadErrorHandlers()}
 *  - Calls {@link DB::connect()}, passing it the global variable $databaseConfig that should
 *    be defined in an _config.php
 *  - Sets up the default director rules using {@link Director::$rules}
 *
 * After that, it calls {@link Director::direct()}, which is responsible for doing most of the
 * real work.
 *
 * CONFIGURING THE WEBSERVER
 *
 * To use SilverStripe, every request that doesn't point directly to a file should be rewritten to
 * framework/main.php?url=(url).  For example, http://www.example.com/about-us/rss would be rewritten
 * to http://www.example.com/framework/main.php?url=about-us/rss
 *
 * It's important that requests that point directly to a file aren't rewritten; otherwise, visitors
 * won't be able to download any CSS, JS, image files, or other downloads.
 *
 * On Apache, RewriteEngine can be used to do this.
 *
 * @package framework
 * @subpackage core
 * @see Director::direct()
 */

/**
 * Include the defines that set BASE_PATH, etc
 */
require_once('core/Constants.php');

// we handle our own cache headers in this application
session_cache_limiter('');

// Enable the entity loader to be able to load XML in Zend_Locale_Data
libxml_disable_entity_loader(false);

/**
 * Figure out the request URL
 */
global $url;

// Helper to safely parse and load a querystring fragment
$parseQuery = function($query) {
	parse_str($query, $_GET);
	if ($_GET) $_REQUEST = array_merge((array)$_REQUEST, (array)$_GET);
};

// Apache rewrite rules and IIS use this
if (isset($_GET['url']) && php_sapi_name() !== 'cli-server') {

	// Prevent injection of url= querystring argument by prioritising any leading url argument
	if(isset($_SERVER['QUERY_STRING']) &&
		preg_match('/^(?<url>url=[^&?]*)(?<query>.*[&?]url=.*)$/', $_SERVER['QUERY_STRING'], $results)
	) {
		$queryString = $results['query'].'&'.$results['url'];
		$parseQuery($queryString);
	}

	$url = $_GET['url'];

	// IIS includes get variables in url
	$i = strpos($url, '?');
	if($i !== false) {
		$url = substr($url, 0, $i);
	}

	// Lighttpd and PHP 5.4's built-in webserver use this
} else {
	// Get raw URL -- still needs to be decoded below (after parsing out query string).
	$url = $_SERVER['REQUEST_URI'];

	// Querystring args need to be explicitly parsed
	if(strpos($url,'?') !== false) {
		list($url, $query) = explode('?',$url,2);
		$parseQuery($query);
	}

	// Decode URL now that it has been separated from query string.
	$url = urldecode($url);

	// Pass back to the webserver for files that exist
	if(php_sapi_name() === 'cli-server' && file_exists(BASE_PATH . $url) && is_file(BASE_PATH . $url)) {
		return false;
	}
}

// Remove base folders from the URL if webroot is hosted in a subfolder
if (substr(strtolower($url), 0, strlen(BASE_URL)) == strtolower(BASE_URL)) $url = substr($url, strlen(BASE_URL));

/**
 * Include SilverStripe's core code
 */
require_once('core/startup/ConfirmationTokenChain.php');
require_once('core/startup/ErrorControlChain.php');
require_once('core/startup/ParameterConfirmationToken.php');
require_once('core/startup/URLConfirmationToken.php');

// Prepare tokens and execute chain
$confirmationTokenChain = new ConfirmationTokenChain();
$confirmationTokenChain->pushToken(new URLConfirmationToken('dev/build'));

foreach (array('isTest', 'isDev', 'flush') as $parameter) {
	$confirmationTokenChain->pushToken(new ParameterConfirmationToken($parameter));
}

$chain = new ErrorControlChain();
$chain
	->then(function($chain) use ($confirmationTokenChain) {
		if ($confirmationTokenChain->suppressionRequired()) {
			$confirmationTokenChain->suppressTokens();
		} else {
			// If no redirection is necessary then we can disable error supression
			$chain->setSuppression(false);
		}

		// Load in core
		require_once('core/Core.php');

		// Connect to database
		require_once('model/DB.php');
		global $databaseConfig;
		if ($databaseConfig) DB::connect($databaseConfig);

		// Check if a token is requesting a redirect
		if (!$confirmationTokenChain->reloadRequired()) return;

		// Otherwise, we start up the session if needed
		if(!isset($_SESSION) && Session::request_contains_session_id()) {
			Session::start();
		}

		// Next, check if we're in dev mode, or the database doesn't have any security data, or we are admin
		if (Director::isDev() || !Security::database_is_ready() || Permission::check('ADMIN')) {
			return $confirmationTokenChain->reloadWithToken();
		}

		// Fail and redirect the user to the login page
		$params = array_merge($_GET, $confirmationTokenChain->params(false));
		if (isset($params['url'])) {
			unset($params['url']);
		}
		$backURL = $confirmationTokenChain->getRedirectUrlBase() . '?' . http_build_query($params);
		$loginPage = Director::absoluteURL(Security::config()->get('login_url'));
		$loginPage .= "?BackURL=" . urlencode($backURL);
		header('location: '.$loginPage, true, 302);
		die;
	})
	// Finally if a token was requested but there was an error while figuring out if it's allowed, do it anyway
	->thenIfErrored(function() use ($confirmationTokenChain){
		if ($confirmationTokenChain->reloadRequired()) {
			$confirmationTokenChain->reloadWithToken();
		}
	})
	->execute();

global $databaseConfig;

// Redirect to the installer if no database is selected
if(!isset($databaseConfig) || !isset($databaseConfig['database']) || !$databaseConfig['database']) {
	if(!file_exists(BASE_PATH . '/install.php')) {
		header($_SERVER['SERVER_PROTOCOL'] . " 500 Server Error");
		die('SilverStripe Framework requires a $databaseConfig defined.');
	}
	$s = (isset($_SERVER['SSL']) || (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off')) ? 's' : '';
	$installURL = "http$s://" . $_SERVER['HTTP_HOST'] . BASE_URL . '/install.php';

	// The above dirname() will equate to "\" on Windows when installing directly from http://localhost (not using
	// a sub-directory), this really messes things up in some browsers. Let's get rid of the backslashes
	$installURL = str_replace('\\', '', $installURL);

	header("Location: $installURL");
	die();
}

// Direct away - this is the "main" function, that hands control to the appropriate controller
DataModel::set_inst(new DataModel());
Director::direct($url, DataModel::inst());