tawfekov · April 25, 2013 05:29 · Mar 10, 2012
diff --git a/class.rewrite.php b/class.rewrite.php
@@ -0,0 +1,177 @@
+<?php
+
+	/**
+	 * @package toolkit
+	 */
+
+	/**
+	 * URL rewriter for use in conjunction with the PHP 5.4 internal HTTP server and `rounter.php`.
+	 */
+	namespace Rewrite;
+
+	class Storage {
+		static $matches = array();
+	}
+
+	/**
+	 * Initialize the rewrite environment.
+	 */
+	function initialize() {
+		set_environment($_SERVER['REQUEST_URI']);
+	}
+
+	/**
+	 * Set important environment variables and re-parse the query string.
+	 * @return boolean
+	 */
+	function finalize() {
+		if (defined('REWRITER_FINALIZED')) return false;
+
+		define('REWRITER_FINALIZED', true);
+
+		if (\is_file($_SERVER['DOCUMENT_ROOT'] . $_SERVER['SCRIPT_NAME'])) {
+			$_SERVER['SCRIPT_FILENAME'] = $_SERVER['DOCUMENT_ROOT'] . $_SERVER['SCRIPT_NAME'];
+		}
+
+		if (isset($_SERVER['QUERY_STRING'])) {
+			$_GET = [];
+
+			parse_str($_SERVER['QUERY_STRING'], $_GET);
+		}
+
+		$_SERVER['PHP_SELF'] = $_SERVER['SCRIPT_NAME'];
+
+		return true;
+	}
+
+	/**
+	 * Adjust the server environment variables to match a given URL.
+	 * @param string $url
+	 */
+	function set_environment($url) {
+		$url = rtrim($url, '&?');
+		$request_uri = $script_name = $url;
+		$query_string = null;
+
+		if (strpos($url, '?') > 0) {
+			$script_name = substr($url, 0, strpos($url, '?'));
+			$query_string = substr($url, 1 + strpos($url, '?'));
+		}
+
+		$_SERVER['REQUEST_URI'] = $request_uri;
+		$_SERVER['SCRIPT_NAME'] = $script_name;
+		$_SERVER['QUERY_STRING'] = $query_string;
+	}
+
+	/**
+	 * Parse regular expression matches. eg. $0 or $1
+	 * @param string $url
+	 * @return string
+	 */
+	function parse_matches($url) {
+		$replace = function($bit) {
+			return isset(Storage::$matches[$bit[1]])
+				? Storage::$matches[$bit[1]]
+				: null;
+		};
+
+		return preg_replace_callback('/\$([0-9]+)/', $replace, $url);
+	}
+
+	/**
+	 * Parse Apache style rewrite parameters. eg. %{QUERY_STRING}
+	 * @param string $url
+	 * @return string
+	 */
+	function parse_parameters($url) {
+		$replace = function($bit) {
+			return isset($_SERVER[$bit[1]])
+				? $_SERVER[$bit[1]]
+				: null;
+		};
+
+		return preg_replace_callback('/%\{([A-Z_+]+)\}/', $replace, $url);
+	}
+
+	/**
+	 * Change the internal url to a different url.
+	 * @param string $from Regular expression to match current url, or optional when used in conjunction with `test`.
+	 * @param string $to URL to redirect to.
+	 * @return boolean
+	 */
+	function rewrite($from, $to = null) {
+		if (defined('REWRITER_FINALIZED')) return false;
+
+		$url = $_SERVER['SCRIPT_NAME'];
+
+		// From and To given:
+		if (isset($to)) {
+			$url = preg_replace($from, $to, $url);
+		}
+
+		// Use results from last test:
+		else {
+			$url = parse_matches($from);
+		}
+
+		set_environment(
+			parse_parameters($url)
+		);
+
+		return true;
+	}
+
+	/**
+	 * Redirect the client to a different url.
+	 * @param string $from Regular expression to match current url, or optional when used in conjunction with `test`.
+	 * @param string $to URL to redirect to.
+	 */
+	function redirect($from, $to = null) {
+		if (defined('REWRITER_FINALIZED')) return false;
+
+		$url = $_SERVER['SCRIPT_NAME'];
+
+		// From and To given:
+		if (isset($to)) {
+			$url = preg_replace($from, $to, $url);
+		}
+
+		// Use results from last test:
+		else {
+			$url = parse_matches($from);
+		}
+
+		$url = parse_parameters($url);
+
+		header('Location: ' . $url); exit;
+	}
+
+	/**
+	 * Compare a regular expression against the current request, store the matches for later use.
+	 * @return boolean
+	 */
+	function test($expression) {
+		if (defined('REWRITER_FINALIZED')) return false;
+
+		return 0 < (integer)preg_match($expression, $_SERVER['SCRIPT_NAME'], Storage::$matches);
+	}
+
+	/**
+	 * Does the current request point to a directory?
+	 * @return boolean
+	 */
+	function is_dir() {
+		if (defined('REWRITER_FINALIZED')) return false;
+
+		return \is_dir($_SERVER['DOCUMENT_ROOT'] . $_SERVER['REQUEST_URI']);
+	}
+
+	/**
+	 * Does the current request point to a file?
+	 * @return boolean
+	 */
+	function is_file() {
+		if (defined('REWRITER_FINALIZED')) return false;
+
+		return \is_file($_SERVER['DOCUMENT_ROOT'] . $_SERVER['REQUEST_URI']);
+	}
diff --git a/router.php b/router.php
@@ -0,0 +1,57 @@
+<?php
+
+	/**
+	 * Router for the testing HTTP server built into PHP 5.4.
+	 * Use with the following command from the root directory
+	 * of your Symphony installation:
+	 *
+	 *	php -S localhost:8080 router.php
+	 *
+	 * If you need to add your own rules, copy this file and
+	 * use it as your own custom router.
+	 */
+
+	namespace Rewrite;
+
+	require_once 'symphony/lib/toolkit/class.rewrite.php';
+
+	// Prepare environment:
+	initialize();
+
+	// SECURITY - Protect crucial files
+	test('%^/manifest/(.*)%')
+		| test('%.+\.(sql|xsl)$%')
+		| test('%^/\.%')
+		&& die('<h1>Access Denied</h1>');
+
+	// Do not apply rules when requesting actual files:
+	if (is_file()) return false;
+
+	// Make sure the URL ends in a trailing slash:
+	test('%(?=/$)%')
+		|| redirect('%^.+%', '$0/');
+
+	// Remove references to index.php:
+	test('%/(symphony/)?index.php(/.*/?)%')
+		&& redirect('$1$2');
+
+	// Admin area rewrite:
+	test('%^/symphony/?$%')
+		&& rewrite('/index.php?mode=administration&%{QUERY_STRING}')
+		&& finalize();
+
+	test('%/symphony(\/(.*\/?))?$%')
+		&& rewrite('/index.php?symphony-page=$1&mode=administration&%{QUERY_STRING}')
+		&& finalize();
+
+	// Frontend page rewrite:
+	rewrite('%^/(.*\/?)$%', '/index.php?symphony-page=$1&%{QUERY_STRING}')
+		&& finalize();
+
+	if (isset($_SERVER['SCRIPT_FILENAME'])) {
+		include_once $_SERVER['SCRIPT_FILENAME'];
+	}
+
+	else {
+		include_once 'index.php';
+	}