From f3aa502157efa11ac3c76e8471d69d0ac9f69f1f Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Tue, 10 Feb 2015 11:51:09 +0100
Subject: [PATCH] Overhauled WCF 2.1 route system

---
 com.woltlab.wcf/option.xml                    |   7 +-
 .../builder/ControllerCacheBuilder.class.php  |   7 +-
 ...lControllerReplacementOptionType.class.php | 120 ++++++++
 .../system/request/FlexibleRoute.class.php    | 289 ++++++++++++++++++
 .../files/lib/system/request/IRoute.class.php |  52 ++++
 .../lib/system/request/LinkHandler.class.php  |   6 +-
 .../system/request/RequestHandler.class.php   |  66 +++-
 .../files/lib/system/request/Route.class.php  |  27 +-
 .../lib/system/request/RouteHandler.class.php |  93 +++++-
 wcfsetup/install/lang/de.xml                  |  16 +-
 wcfsetup/install/lang/en.xml                  |  16 +-
 11 files changed, 643 insertions(+), 56 deletions(-)
 create mode 100644 wcfsetup/install/files/lib/system/option/UrlControllerReplacementOptionType.class.php
 create mode 100644 wcfsetup/install/files/lib/system/request/FlexibleRoute.class.php
 create mode 100644 wcfsetup/install/files/lib/system/request/IRoute.class.php

diff --git a/com.woltlab.wcf/option.xml b/com.woltlab.wcf/option.xml
index 6eb2698d87..6f8daebd22 100644
--- a/com.woltlab.wcf/option.xml
+++ b/com.woltlab.wcf/option.xml
@@ -430,16 +430,16 @@
 				<categoryname>general.page.seo</categoryname>
 				<optiontype>boolean</optiontype>
 				<defaultvalue>0</defaultvalue>
+				<enableoptions>!url_controller_replacement</enableoptions>
 			</option>
 			<option name="url_omit_index_php">
 				<categoryname>general.page.seo</categoryname>
 				<optiontype>boolean</optiontype>
 				<defaultvalue>0</defaultvalue>
 			</option>
-			<option name="url_to_lowercase">
+			<option name="url_controller_replacement">
 				<categoryname>general.page.seo</categoryname>
-				<optiontype>boolean</optiontype>
-				<defaultvalue>1</defaultvalue>
+				<optiontype>urlControllerReplacement</optiontype>
 			</option>
 			<option name="url_title_component_replacement">
 				<categoryname>general.page.seo</categoryname>
@@ -1402,5 +1402,6 @@ DESC:wcf.global.sortOrder.descending]]></selectoptions>
 	<delete>
 		<option name="cache_source_memcached_use_pconnect" />
 		<option name="http_gzip_level" />
+		<option name="url_to_lowercase" />
 	</delete>
 </data>
diff --git a/wcfsetup/install/files/lib/system/cache/builder/ControllerCacheBuilder.class.php b/wcfsetup/install/files/lib/system/cache/builder/ControllerCacheBuilder.class.php
index 78c75151fe..e10123e330 100644
--- a/wcfsetup/install/files/lib/system/cache/builder/ControllerCacheBuilder.class.php
+++ b/wcfsetup/install/files/lib/system/cache/builder/ControllerCacheBuilder.class.php
@@ -51,20 +51,21 @@ class ControllerCacheBuilder extends AbstractCacheBuilder {
 		$controllers = array();
 		$path .= $type . '/';
 		
-		$files = glob($path . '*' . ucfirst($type) . '.class.php');
+		$type = ucfirst($type);
+		$files = glob($path . '*' . $type . '.class.php');
 		if ($files === false) {
 			return array();
 		}
 		
 		foreach ($files as $file) {
 			$file = basename($file);
-			if (preg_match('~^([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)(Action|Form|Page)\.class\.php$~', $file, $match)) {
+			if (preg_match('~^([A-Z][A-Za-z0-9]*)' . $type . '\.class\.php$~', $file, $match)) {
 				if ($match[1] === 'I') {
 					continue;
 				}
 				
 				$controller = mb_strtolower($match[1]);
-				$fqn = '\\' . $abbreviation . '\\' . ($isACP ? 'acp\\' : '') . $type . '\\' . $match[1] . $match[2];
+				$fqn = '\\' . $abbreviation . '\\' . ($isACP ? 'acp\\' : '') . $type . '\\' . $match[1] . $type;
 				
 				$controllers[$controller] = $fqn;
 			}
diff --git a/wcfsetup/install/files/lib/system/option/UrlControllerReplacementOptionType.class.php b/wcfsetup/install/files/lib/system/option/UrlControllerReplacementOptionType.class.php
new file mode 100644
index 0000000000..c212f8377d
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/option/UrlControllerReplacementOptionType.class.php
@@ -0,0 +1,120 @@
+<?php
+namespace wcf\system\option;
+use wcf\data\option\Option;
+use wcf\util\StringUtil;
+use wcf\system\exception\UserInputException;
+use wcf\system\WCF;
+use wcf\system\cache\builder\ControllerCacheBuilder;
+
+/**
+ * Option type implementation for URL controller replacements.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2015 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	com.woltlab.wcf
+ * @subpackage	system.option
+ * @category	Community Framework
+ */
+class UrlControllerReplacementOptionType extends TextareaOptionType {
+	/**
+	 * list of known controllers grouped by application
+	 * @var	array<array>
+	 */
+	protected $controllers = null;
+	
+	/**
+	 * @see	\wcf\system\option\IOptionType::getData()
+	 */
+	public function getData(Option $option, $newValue) {
+		return $this->cleanup($newValue);
+	}
+	
+	/**
+	 * @see	\wcf\system\option\IOptionType::validate()
+	 */
+	public function validate(Option $option, $newValue) {
+		$newValue = $this->cleanup($newValue);
+		if (!empty($newValue)) {
+			$lines = explode("\n", $newValue);
+			
+			$aliases = array();
+			$controllers = array();
+			for ($i = 0, $length = count($lines); $i < $length; $i++) {
+				$line = $lines[$i];
+				if (preg_match('~^(?P<controller>[a-z0-9\-]+)=(?P<alias>[a-z0-9\-]+)$~', $line, $matches)) {
+					// check if there is already a replacement for given controller
+					if (in_array($matches['controller'], $controllers)) {
+						WCF::getTPL()->assign('urlControllerReplacementError', $matches['controller']);
+						throw new UserInputException($option->optionName, 'controllerReplacementDuplicateController', array('controller' => $matches['controller']));
+					}
+					
+					// check if there is already the same alias for a different controller
+					if (in_array($matches['alias'], $aliases)) {
+						WCF::getTPL()->assign('urlControllerReplacementError', $matches['alias']);
+						throw new UserInputException($option->optionName, 'controllerReplacementDuplicateAlias', array('alias' => $matches['alias']));
+					}
+					
+					$aliases[] = $matches['alias'];
+					$controllers[] = $matches['controller'];
+					
+					// check if controller exists
+					if (!$this->isKnownController($matches['controller'])) {
+						WCF::getTPL()->assign('urlControllerReplacementError', $matches['controller']);
+						throw new UserInputException($option->optionName, 'controllerReplacementUnknown', array('controller' => $matches['controller']));
+					}
+					
+					// check if alias collides with an existing controller name
+					if ($this->isKnownController($matches['alias'])) {
+						WCF::getTPL()->assign('urlControllerReplacementError', $matches['alias']);
+						throw new UserInputException($option->optionName, 'controllerReplacementCollision', array('alias' => $matches['alias']));
+					}
+				}
+				else {
+					throw new UserInputException($option->optionName, 'controllerReplacementInvalidFormat', array('line' => $line));
+				}
+			}
+		}
+	}
+	
+	/**
+	 * Cleans up newlines and converts input to lower-case.
+	 * 
+	 * @param	string		$newValue
+	 * @return	string
+	 */
+	protected function cleanup($newValue) {
+		$newValue = StringUtil::unifyNewlines($newValue);
+		$newValue = trim($newValue);
+		$newValue = preg_replace('~\n+~', "\n", $newValue);
+		$newValue = mb_strtolower($newValue);
+		
+		return $newValue;
+	}
+	
+	/**
+	 * Returns true if given controller name is known to the system, used to
+	 * prevent aliases colliding with existing ones.
+	 * 
+	 * @param	string		$controller
+	 * @return	boolean
+	 */
+	protected function isKnownController($controller) {
+		if ($this->controllers === null) {
+			$this->controllers = ControllerCacheBuilder::getInstance()->getData(array(
+				'environment' => 'user'
+			));
+		}
+		
+		$controller = str_replace('-', '', $controller);
+		foreach ($this->controllers as $types) {
+			foreach ($types as $controllers) {
+				if (isset($controllers[$controller])) {
+					return true;
+				}
+			}
+		}
+		
+		return false;
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/request/FlexibleRoute.class.php b/wcfsetup/install/files/lib/system/request/FlexibleRoute.class.php
new file mode 100644
index 0000000000..163a47934e
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/request/FlexibleRoute.class.php
@@ -0,0 +1,289 @@
+<?php
+namespace wcf\system\request;
+use wcf\system\application\ApplicationHandler;
+use wcf\system\menu\page\PageMenu;
+
+/**
+ * Flexible route implementation to resolve HTTP requests.
+ * 
+ * Inspired by routing mechanism used by ASP.NET MVC and released under the terms of
+ * the Microsoft Public License (MS-PL) http://www.opensource.org/licenses/ms-pl.html
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2015 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	com.woltlab.wcf
+ * @subpackage	system.request
+ * @category	Community Framework
+ */
+class FlexibleRoute implements IRoute {
+	/**
+	 * schema for outgoing links
+	 * @var	array<array>
+	 */
+	protected $buildSchema = array();
+	
+	/**
+	 * route is restricted to ACP
+	 * @var	boolean
+	 */
+	protected $isACP = false;
+	
+	/**
+	 * pattern for incoming requests
+	 * @var	string
+	 */
+	protected $pattern = '';
+	
+	/**
+	 * list of required components
+	 * @var	array<string>
+	 */
+	protected $requireComponents = array();
+	
+	/**
+	 * parsed request data
+	 * @var	array<mixed>
+	 */
+	protected $routeData = array();
+	
+	/**
+	 * cached list of transformed controller names
+	 * @var	array<string>
+	 */
+	protected static $controllerNames = array();
+	
+	/**
+	 * Creates a new flexible route instace.
+	 * 
+	 * @param	boolean		$isACP
+	 */
+	public function __construct($isACP) {
+		$this->isACP = $isACP;
+		
+		$this->pattern = '~
+			/?
+			(?:
+				(?P<controller>[A-Za-z0-9\-]+)
+				(?:
+					/
+					(?P<id>\d+)	
+				)?
+			)?
+		~x';
+		$this->setBuildSchema('/{controller}/{id}-{title}/');
+	}
+	
+	/**
+	 * Sets the build schema used to build outgoing links.
+	 * 
+	 * @param	string		$buildSchema
+	 */
+	public function setBuildSchema($buildSchema) {
+		$this->buildSchema = array();
+		
+		$buildSchema = ltrim($buildSchema, '/');
+		$components = preg_split('~{([a-z]+)}~', $buildSchema, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
+		$delimiters = array('/', '-', '.', '_');
+		
+		foreach ($components as $component) {
+			$type = 'component';
+			if (in_array($component, $delimiters)) {
+				$type = 'separator';
+			}
+			
+			$this->buildSchema[] = array(
+				'type' => $type,
+				'value' => $component
+			);
+		}
+	}
+	
+	/**
+	 * Sets the route pattern used to evaluate an incoming request.
+	 * 
+	 * @param	string		$pattern
+	 */
+	public function setPattern($pattern) {
+		$this->pattern = $pattern;
+	}
+	
+	/**
+	 * Sets the list of required components.
+	 * 
+	 * @param	array<string>	$requiredComponents
+	 */
+	public function setRequiredComponents(array $requiredComponents) {
+		$this->requireComponents = $requiredComponents;
+	}
+	
+	/**
+	 * @see	\wcf\system\request\IRoute::buildLink()
+	 */
+	public function buildLink(array $components) {
+		$application = (isset($components['application'])) ? $components['application'] : null;
+		
+		// drop application component to avoid being appended as query string
+		unset($components['application']);
+		
+		$link = '';
+		
+		// handle default values for controller
+		$buildRoute = true;
+		if (count($components) == 1 && isset($components['controller'])) {
+			$ignoreController = false;
+			
+			if (!RequestHandler::getInstance()->isACPRequest()) {
+				$landingPage = PageMenu::getInstance()->getLandingPage();
+				if ($landingPage !== null && strcasecmp($landingPage->getController(), $components['controller']) == 0) {
+					$ignoreController = true;
+				}
+				
+				// check if this is the default controller of the requested application
+				if (!$ignoreController && $application !== null) {
+					if (RouteHandler::getInstance()->getDefaultController($application) == $components['controller']) {
+						// check if this is the primary application and the landing page originates to the same application
+						$primaryApplication = ApplicationHandler::getInstance()->getPrimaryApplication();
+						$abbreviation = ApplicationHandler::getInstance()->getAbbreviation($primaryApplication->packageID);
+						if ($abbreviation != $application || $landingPage === null || $landingPage->getApplication() != 'wcf') {
+							$ignoreController = true;
+						}
+					}
+				}
+			}
+			
+			// drops controller from route
+			if ($ignoreController) {
+				$buildRoute = false;
+				
+				// unset the controller, since it would otherwise be added with http_build_query()
+				unset($components['controller']);
+			}
+		}
+		
+		if ($buildRoute) {
+			$lastSeparator = null;
+			foreach ($this->buildSchema as $component) {
+				$value = $component['value'];
+				
+				if ($component['type'] === 'separator') {
+					$lastSeparator = $value;
+				}
+				else {
+					// routes are build from left-to-right
+					if (empty($components[$value])) {
+						break;
+					}
+					
+					if ($lastSeparator !== null) {
+						$link .= $lastSeparator;
+						$lastSeparator = null;
+					}
+					
+					// handle controller names
+					if ($value === 'controller') {
+						$components[$value] = $this->getControllerName($application, $components[$value]);
+					}
+					
+					$link .= $components[$value];
+					unset($components[$value]);
+				}
+			}
+			
+			if (!empty($link)) {
+				$link .= '/';
+			}
+		}
+		
+		if ($this->isACP || !URL_OMIT_INDEX_PHP) {
+			if (!empty($link)) {
+				$link = 'index.php?' . $link;
+			}
+		}
+		
+		if (!empty($components)) {
+			if (strpos($link, '?') === false) $link .= '?';
+			else $link .= '&';
+			
+			$link .= http_build_query($components, '', '&');
+		}
+		
+		return $link;
+	}
+	
+	/**
+	 * @see	\wcf\system\request\IRoute::canHandle()
+	 */
+	public function canHandle(array $components) {
+		if (!empty($this->requireComponents)) {
+			foreach ($this->requireComponents as $component => $pattern) {
+				if (empty($components[$component])) {
+					return false;
+				}
+				
+				if ($pattern && !preg_match($pattern, $components[$component])) {
+					return false;
+				}
+			}
+		}
+		
+		return true;
+	}
+	
+	/**
+	 * @see	\wcf\system\request\IRoute::getRouteData()
+	 */
+	public function getRouteData() {
+		return $this->routeData;
+	}
+	
+	/**
+	 * @see	\wcf\system\request\IRoute::isACP()
+	 */
+	public function isACP() {
+		return $this->isACP;
+	}
+	
+	/**
+	 * @see	\wcf\system\request\IRoute::matches()
+	 */
+	public function matches($requestURL) {
+		if (preg_match($this->pattern, $requestURL, $matches)) {
+			foreach ($matches as $key => $value) {
+				if (!is_numeric($key)) {
+					$this->routeData[$key] = $value;
+				}
+			}
+			
+			$this->routeData['isDefaultController'] = (!isset($this->routeData['controller']));
+			
+			return true;
+		}
+		
+		return false;
+	}
+	
+	/**
+	 * Returns the transformed controller name.
+	 * 
+	 * @param	string		$application
+	 * @param	string		$controller
+	 * @return	string
+	 */
+	protected function getControllerName($application, $controller) {
+		if (!isset(self::$controllerNames[$controller])) {
+			$parts = preg_split('~([A-Z][a-z0-9]+)~', $controller, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
+			$controllerName = '';
+			for ($i = 0, $length = count($parts); $i < $length; $i++) {
+				if (!empty($controllerName)) $controllerName .= '-';
+				$controllerName .= strtolower($parts[$i]);
+			}
+			
+			$alias = RequestHandler::getInstance()->getAliasByController($controllerName);
+			
+			self::$controllerNames[$controller] = ($alias) ?: $controllerName;
+		}
+		
+		return self::$controllerNames[$controller];
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/request/IRoute.class.php b/wcfsetup/install/files/lib/system/request/IRoute.class.php
new file mode 100644
index 0000000000..7ba99e62a1
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/request/IRoute.class.php
@@ -0,0 +1,52 @@
+<?php
+namespace wcf\system\request;
+
+/**
+ * Default interface for route implementations.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2015 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	com.woltlab.wcf
+ * @subpackage	system.request
+ * @category	Community Framework
+ */
+interface IRoute {
+	/**
+	 * Builds a link upon route components.
+	 * 
+	 * @param	array		$components
+	 * @return	string
+	 */
+	public function buildLink(array $components);
+	
+	/**
+	 * Returns true if current route can handle the build request.
+	 * 
+	 * @param	array		$components
+	 * @return	boolean
+	 */
+	public function canHandle(array $components);
+	
+	/**
+	 * Returns parsed route data.
+	 * 
+	 * @return	array
+	 */
+	public function getRouteData();
+	
+	/**
+	 * Returns true if route applies for ACP.
+	 * 
+	 * @return	boolean
+	 */
+	public function isACP();
+	
+	/**
+	 * Returns true if given request url matches this route.
+	 * 
+	 * @param	string		$requestURL
+	 * @return	boolean
+	 */
+	public function matches($requestURL);
+}
diff --git a/wcfsetup/install/files/lib/system/request/LinkHandler.class.php b/wcfsetup/install/files/lib/system/request/LinkHandler.class.php
index 1db4ae1429..353f7b7999 100644
--- a/wcfsetup/install/files/lib/system/request/LinkHandler.class.php
+++ b/wcfsetup/install/files/lib/system/request/LinkHandler.class.php
@@ -12,7 +12,7 @@ use wcf\util\StringUtil;
  * Handles relative links within the wcf.
  * 
  * @author	Marcel Werk
- * @copyright	2001-2014 WoltLab GmbH
+ * @copyright	2001-2015 WoltLab GmbH
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	com.woltlab.wcf
  * @subpackage	system.request
@@ -156,7 +156,7 @@ class LinkHandler extends SingletonFactory {
 			// trim to 80 characters
 			$parameters['title'] = rtrim(mb_substr($parameters['title'], 0, 80), '-');
 			
-			if (URL_TO_LOWERCASE) {
+			if (!URL_LEGACY_MODE) {
 				$parameters['title'] = mb_strtolower($parameters['title']);
 			}
 			
@@ -164,7 +164,7 @@ class LinkHandler extends SingletonFactory {
 			if ($encodeTitle) $parameters['title'] = rawurlencode($parameters['title']);
 		}
 		
-		$parameters['controller'] = (URL_TO_LOWERCASE) ? mb_strtolower($controller) : $controller;
+		$parameters['controller'] = $controller;
 		$routeURL = RouteHandler::getInstance()->buildRoute($parameters, $isACP);
 		if (!$isRaw && !empty($url)) {
 			$routeURL .= (strpos($routeURL, '?') === false) ? '?' : '&';
diff --git a/wcfsetup/install/files/lib/system/request/RequestHandler.class.php b/wcfsetup/install/files/lib/system/request/RequestHandler.class.php
index 17734a7dfc..eb099df7e7 100644
--- a/wcfsetup/install/files/lib/system/request/RequestHandler.class.php
+++ b/wcfsetup/install/files/lib/system/request/RequestHandler.class.php
@@ -15,7 +15,7 @@ use wcf\util\HeaderUtil;
  * Handles http requests.
  * 
  * @author	Marcel Werk
- * @copyright	2001-2014 WoltLab GmbH
+ * @copyright	2001-2015 WoltLab GmbH
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	com.woltlab.wcf
  * @subpackage	system.request
@@ -34,6 +34,12 @@ class RequestHandler extends SingletonFactory {
 	 */
 	protected $controllers = null;
 	
+	/**
+	 * list of controller aliases
+	 * @var	array<string>
+	 */
+	protected $controllerAliases = array();
+	
 	/**
 	 * true, if current domain mismatch any known domain
 	 * @var	boolean
@@ -78,6 +84,14 @@ class RequestHandler extends SingletonFactory {
 			$this->controllers = ControllerCacheBuilder::getInstance()->getData(array(
 				'environment' => ($this->isACPRequest ? 'admin' : 'user')
 			));
+			
+			if (!URL_LEGACY_MODE && URL_CONTROLLER_REPLACEMENT) {
+				$controllerAliases = explode("\n", URL_CONTROLLER_REPLACEMENT);
+				for ($i = 0, $length = count($controllerAliases); $i < $length; $i++) {
+					$tmp = explode('=', $controllerAliases[$i]);
+					$this->controllerAliases[$tmp[0]] = $tmp[1];
+				}
+			}
 		}
 	}
 	
@@ -162,12 +176,28 @@ class RequestHandler extends SingletonFactory {
 						exit;
 					}
 				}
+				
+				// handle controller aliasing
+				if (!URL_LEGACY_MODE && isset($routeData['controller'])) {
+					// aliased controller, pretend it does not exist
+					if ($this->getAliasByController($routeData['controller']) !== null) {
+						throw new IllegalLinkException();
+					}
+					
+					$controller = $this->getControllerByAlias($routeData['controller']);
+					if ($controller !== null) {
+						$routeData['controller'] = $controller;
+					}
+				}
+			}
+			else if (empty($routeData['controller'])) {
+				$routeData['controller'] = 'Index';
 			}
 			
 			$controller = $routeData['controller'];
 			
 			// validate class name
-			if (!preg_match('~^[a-z0-9_]+$~i', $controller)) {
+			if (!preg_match('~^[a-z0-9' . (URL_LEGACY_MODE ? '' : '\-') . ']+$~i', $controller)) {
 				throw new SystemException("Illegal class name '".$controller."'");
 			}
 			
@@ -249,7 +279,6 @@ class RequestHandler extends SingletonFactory {
 	 */
 	protected function getClassData($controller, $pageType, $application) {
 		$className = false;
-		
 		if ($this->controllers !== null) {
 			$className = $this->lookupController($controller, $pageType, $application);
 			if ($className === false && $application != 'wcf') {
@@ -293,6 +322,8 @@ class RequestHandler extends SingletonFactory {
 	protected function lookupController($controller, $pageType, $application) {
 		if (isset($this->controllers[$application]) && isset($this->controllers[$application][$pageType])) {
 			$ciController = mb_strtolower($controller);
+			if (!URL_LEGACY_MODE) $ciController = str_replace('-', '', $ciController);
+			
 			if (isset($this->controllers[$application][$pageType][$ciController])) {
 				return $this->controllers[$application][$pageType][$ciController];
 			}
@@ -327,4 +358,33 @@ class RequestHandler extends SingletonFactory {
 	public function inRescueMode() {
 		return $this->inRescueMode;
 	}
+	
+	/**
+	 * Returns the alias by controller or null if there is no match.
+	 * 
+	 * @param	string		$controller
+	 * @return	string
+	 */
+	public function getAliasByController($controller) {
+		if (isset($this->controllerAliases[$controller])) {
+			return $this->controllerAliases[$controller];
+		}
+		
+		return null;
+	}
+	
+	/**
+	 * Returns the controller by alias or null if there is no match.
+	 * 
+	 * @param	string		$alias
+	 * @return	string
+	 */
+	public function getControllerByAlias($alias) {
+		$controller = array_search($alias, $this->controllerAliases);
+		if ($controller !== false) {
+			return $controller;
+		}
+		
+		return null;
+	}
 }
diff --git a/wcfsetup/install/files/lib/system/request/Route.class.php b/wcfsetup/install/files/lib/system/request/Route.class.php
index 3b529626b8..32cdfdf30d 100644
--- a/wcfsetup/install/files/lib/system/request/Route.class.php
+++ b/wcfsetup/install/files/lib/system/request/Route.class.php
@@ -12,13 +12,13 @@ use wcf\system\WCF;
  * the Microsoft Public License (MS-PL) http://www.opensource.org/licenses/ms-pl.html
  * 
  * @author	Alexander Ebert
- * @copyright	2001-2014 WoltLab GmbH
+ * @copyright	2001-2015 WoltLab GmbH
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	com.woltlab.wcf
  * @subpackage	system.request
  * @category	Community Framework
  */
-class Route {
+class Route implements IRoute {
 	/**
 	 * route controller if controller is no part of the route schema
 	 * @var	string
@@ -128,10 +128,7 @@ class Route {
 	}
 	
 	/**
-	 * Returns true if given request url matches this route.
-	 * 
-	 * @param	string		$requestURL
-	 * @return	boolean
+	 * @see	\wcf\system\request\IRoute::matches()
 	 */
 	public function matches($requestURL) {
 		$urlParts = $this->getParts($requestURL);
@@ -194,9 +191,7 @@ class Route {
 	}
 	
 	/**
-	 * Returns parsed route data.
-	 * 
-	 * @return	array
+	 * @see	\wcf\system\request\IRoute::getRouteData()
 	 */
 	public function getRouteData() {
 		return $this->routeData;
@@ -221,10 +216,7 @@ class Route {
 	}
 	
 	/**
-	 * Returns true if current route can handle the build request.
-	 * 
-	 * @param	array		$components
-	 * @return	boolean
+	 * @see	\wcf\system\request\IRoute::canHandle()
 	 */
 	public function canHandle(array $components) {
 		foreach ($this->routeSchema as $schemaPart) {
@@ -256,10 +248,7 @@ class Route {
 	}
 	
 	/**
-	 * Builds a link upon route components.
-	 * 
-	 * @param	array		$components
-	 * @return	string
+	 * @see	\wcf\system\request\IRoute::buildLink()
 	 */
 	public function buildLink(array $components) {
 		$application = (isset($components['application'])) ? $components['application'] : null;
@@ -345,9 +334,7 @@ class Route {
 	}
 	
 	/**
-	 * Returns true if route applies for ACP.
-	 * 
-	 * @return	boolean
+	 * @see	\wcf\system\request\IRoute::isACP()
 	 */
 	public function isACP() {
 		return $this->isACP;
diff --git a/wcfsetup/install/files/lib/system/request/RouteHandler.class.php b/wcfsetup/install/files/lib/system/request/RouteHandler.class.php
index e626f9bb5c..5ad3a35bb6 100644
--- a/wcfsetup/install/files/lib/system/request/RouteHandler.class.php
+++ b/wcfsetup/install/files/lib/system/request/RouteHandler.class.php
@@ -1,8 +1,10 @@
 <?php
 namespace wcf\system\request;
+use wcf\system\application\ApplicationHandler;
 use wcf\system\event\EventHandler;
 use wcf\system\exception\SystemException;
 use wcf\system\SingletonFactory;
+use wcf\system\WCF;
 use wcf\util\FileUtil;
 
 /**
@@ -12,7 +14,7 @@ use wcf\util\FileUtil;
  * the Microsoft Public License (MS-PL) http://www.opensource.org/licenses/ms-pl.html
  * 
  * @author	Alexander Ebert
- * @copyright	2001-2014 WoltLab GmbH
+ * @copyright	2001-2015 WoltLab GmbH
  * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  * @package	com.woltlab.wcf
  * @subpackage	system.request
@@ -49,6 +51,12 @@ class RouteHandler extends SingletonFactory {
 	 */
 	protected static $secure = null;
 	
+	/**
+	 * list of application abbreviation and default controller name
+	 * @var	array<string>
+	 */
+	protected $defaultControllers = null;
+	
 	/**
 	 * true, if default controller is used (support for custom landing page)
 	 * @var	boolean
@@ -57,7 +65,7 @@ class RouteHandler extends SingletonFactory {
 	
 	/**
 	 * list of available routes
-	 * @var	array<\wcf\system\request\Route>
+	 * @var	array<\wcf\system\request\IRoute>
 	 */
 	protected $routes = array();
 	
@@ -81,32 +89,41 @@ class RouteHandler extends SingletonFactory {
 	 * Adds default routes.
 	 */
 	protected function addDefaultRoutes() {
-		$acpRoute = new Route('ACP_default', true);
-		$acpRoute->setSchema('/{controller}/{id}');
-		$acpRoute->setParameterOption('controller', 'Index', null, true);
-		$acpRoute->setParameterOption('id', null, '\d+', true);
-		$this->addRoute($acpRoute);
-		
-		$defaultRoute = new Route('default');
-		$defaultRoute->setSchema('/{controller}/{id}');
-		$defaultRoute->setParameterOption('controller', null, null, true);
-		$defaultRoute->setParameterOption('id', null, '\d+', true);
-		$this->addRoute($defaultRoute);
+		if (URL_LEGACY_MODE) {
+			$acpRoute = new Route('ACP_default', true);
+			$acpRoute->setSchema('/{controller}/{id}');
+			$acpRoute->setParameterOption('controller', 'Index', null, true);
+			$acpRoute->setParameterOption('id', null, '\d+', true);
+			$this->addRoute($acpRoute);
+			
+			$defaultRoute = new Route('default');
+			$defaultRoute->setSchema('/{controller}/{id}');
+			$defaultRoute->setParameterOption('controller', null, null, true);
+			$defaultRoute->setParameterOption('id', null, '\d+', true);
+			$this->addRoute($defaultRoute);
+		}
+		else {
+			$acpRoute = new FlexibleRoute(true);
+			$this->addRoute($acpRoute);
+			
+			$defaultRoute = new FlexibleRoute(false);
+			$this->addRoute($defaultRoute);
+		}
 	}
 	
 	/**
 	 * Adds a new route to the beginning of all routes.
 	 * 
-	 * @param	\wcf\system\request\Route	$route
+	 * @param	\wcf\system\request\IRoute	$route
 	 */
-	public function addRoute(Route $route) {
+	public function addRoute(IRoute $route) {
 		array_unshift($this->routes, $route);
 	}
 	
 	/**
 	 * Returns all registered routes. 
 	 * 
-	 * @return	array<\wcf\system\request\Route>
+	 * @return	array<\wcf\system\request\IRoute>
 	 **/
 	public function getRoutes() {
 		return $this->routes; 
@@ -314,4 +331,48 @@ class RouteHandler extends SingletonFactory {
 		
 		return self::$pathInfo;
 	}
+	
+	/**
+	 * Returns the default controller name for given application.
+	 * 
+	 * @param	string		$application
+	 * @return	string
+	 */
+	public function getDefaultController($application) {
+		$this->loadDefaultControllers();
+		
+		if (isset($this->defaultControllers[$application])) {
+			return $this->defaultControllers[$application];
+		}
+		
+		return '';
+	}
+	
+	/**
+	 * Loads the default controllers for each active application.
+	 */
+	protected function loadDefaultControllers() {
+		if ($this->defaultControllers === null) {
+			$this->defaultControllers = array();
+			
+			foreach (ApplicationHandler::getInstance()->getApplications() as $application) {
+				$app = WCF::getApplicationObject($application);
+				
+				if (!$app) {
+					continue;
+				}
+				
+				$controller = $app->getPrimaryController();
+				
+				if (!$controller) {
+					continue;
+				}
+				
+				$controller = explode('\\', $controller);
+				$controllerName = preg_replace('~(Action|Form|Page)$~', '', array_pop($controller));
+				
+				$this->defaultControllers[$controller[0]] = $controllerName;
+			}
+		}
+	}
 }
diff --git a/wcfsetup/install/lang/de.xml b/wcfsetup/install/lang/de.xml
index deacd860af..402e8fa838 100644
--- a/wcfsetup/install/lang/de.xml
+++ b/wcfsetup/install/lang/de.xml
@@ -737,6 +737,10 @@
 		<item name="wcf.acp.option.cookie_path"><![CDATA[Cookiepfad]]></item>
 		<item name="wcf.acp.option.cookie_path.description"><![CDATA[Der Cookiepfad wird absolut zum Document Root angegeben - also z.B. "/forum" für http://www.woltlab.de/forum.]]></item>
 		<item name="wcf.acp.option.cookie_prefix"><![CDATA[Präfix für Cookienamen]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementCollision"><![CDATA[Das Alias „{$urlControllerReplacementError}“ kollidiert mit einem real existierenden Controller und ist daher unzulässig.]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementDuplicateAlias"><![CDATA[Das Alias „{$urlControllerReplacementError}“ wird bereits verwendet.]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementDuplicateController"><![CDATA[Dem Controller „{$urlControllerReplacementError}“ wurde bereits ein Alias zugewiesen.]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementDuplicateUnknown"><![CDATA[Der Controller „{$urlControllerReplacementError}“ ist unbekannt.]]></item>
 		<item name="wcf.acp.option.error.tooHigh"><![CDATA[Der angegebene Wert ist zu hoch.{if $option->maxvalue !== null} Der maximale Wert ist {#$option->maxvalue}.{/if}]]></item>
 		<item name="wcf.acp.option.error.tooLow"><![CDATA[Der angegebene Wert ist zu gering.{if $option->minvalue !== null} Der minimale Wert ist {#$option->minvalue}.{/if}]]></item>
 		<item name="wcf.acp.option.export"><![CDATA[Optionen sichern]]></item>
@@ -981,6 +985,12 @@
 Beispiele:<br />
 WBB=WoltLab Burning Board<br />
 GmbH=Gesellschaft mit beschränkter Haftung]]></item>
+		<item name="wcf.acp.option.url_controller_replacement"><![CDATA[Controller-Umbenennung]]></item>
+		<item name="wcf.acp.option.url_controller_replacement.description"><![CDATA[Sie können die Controller umbenennen und diesen so eine neue Bezeichnung zuweisen, pro Zeile können Sie einen Alias definieren. Die Angabe muss im Format „realer-name=neuer-name“ erfolgen und darf aus Kompatibilitätsgründen nur aus den Kleinbuchstaben a-z, den Zahlen 0-9 sowie Bindestrichen bestehen. Beispiele:
+<ul class="nativeList">
+	<li>„board-list=forums“, der Link „http://example.com/index.php?board-list/“ wird zu „http://example.com/index.php?forums/“</li>
+	<li>„members-list=profile“, der Link „http://example.com/index.php?members-list/“ wird zu „http://example.com/index.php?profile/“</li>
+</ul>]]></item>
 		<item name="wcf.acp.option.users_online_record_no_guests"><![CDATA[Nur registrierte Benutzer im Benutzer-Online-Rekord zählen]]></item>
 		<item name="wcf.acp.option.users_online_enable_legend"><![CDATA[Legende der Benutzergruppen anzeigen]]></item>
 		<item name="wcf.acp.option.category.general.system.googleMaps"><![CDATA[Google Maps]]></item>
@@ -1005,15 +1015,13 @@ GmbH=Gesellschaft mit beschränkter Haftung]]></item>
 		<item name="wcf.acp.option.module_cookie_policy_page"><![CDATA[Erklärung zum „Einsatz von Cookies“ aktivieren]]></item>
 		<item name="wcf.acp.option.module_cookie_policy_page.description"><![CDATA[Weist Besucher beim ersten Aufruf der Seite gemäß EU-Richtlinie 2009/136/EG auf den Einsatz von Cookies hin.]]></item>
 		<item name="wcf.acp.option.url_omit_index_php"><![CDATA[Link-Umschreibungen aktivieren]]></item>
-		<item name="wcf.acp.option.url_omit_index_php.description"><![CDATA[Wandelt Links in eine vereinfachte Form um, aus „http://example.com/?Thread/1-Dies-ist-ein-Test/“ wird „http://example.com/thread/1-dies-ist-ein-test/“ und vergleichbar. Achtung: Die Aktivierung der Link-Umschreibungen erfordert Rewrite-Unterstützung in Ihrem Webserver sowie eine entsprechende Konfiguration. Fehlerhafte Einstellungen können hier dazu führen, dass Links nicht mehr aufrufbar sind.]]></item>
+		<item name="wcf.acp.option.url_omit_index_php.description"><![CDATA[Wandelt Links in eine vereinfachte Form um, aus „http://example.com/index.php?thread/1-dies-ist-ein-test/“ wird „http://example.com/thread/1-dies-ist-ein-test/“ und vergleichbar. Achtung: Die Aktivierung der Link-Umschreibungen erfordert Rewrite-Unterstützung in Ihrem Webserver sowie eine entsprechende Konfiguration. Fehlerhafte Einstellungen können hier dazu führen, dass Links nicht mehr aufrufbar sind.]]></item>
 		<item name="wcf.acp.option.url_legacy_mode"><![CDATA[Kompatibilitätsmodus für Links aktivieren]]></item>
 		<item name="wcf.acp.option.url_legacy_mode.description"><![CDATA[Die Aktivierung dieses Modus erzwingt die URL-Struktur von WoltLab Community Framework 2.0 und sollte nur aus Kompatibilitätsgründen zur Beibehaltung der Link-Gültigkeit aktiviert werden:
 <ul class="nativeList">
 	<li>WCF 2.0: „index.php/Thread/123-Title/“</li>
-	<li>WCF 2.1+: „?Thread/123-Title/“</li>
+	<li>WCF 2.1+: „index.php?thread/123-title/“</li>
 </ul>]]></item>
-		<item name="wcf.acp.option.url_to_lowercase"><![CDATA[Durchgehende Kleinschreibung in Links aktivieren]]></item>
-		<item name="wcf.acp.option.url_to_lowercase.description"><![CDATA[Links verwenden keine Großbuchstaben mehr, aus „Thread/1-Dies-ist-ein-Test/“ wird „thread/1-dies-ist-ein-test/“.]]></item>
 		<item name="wcf.acp.option.module_wcf_ad"><![CDATA[Werbung]]></item>
 		<item name="wcf.acp.option.module_wcf_ad.description"><![CDATA[Aktiviert die <a href="{link controller='AdList'}{/link}">Verwaltung von Werbe-Anzeigen</a>.]]></item>
 		<item name="wcf.acp.option.captcha_type"><![CDATA[Captcha-Art]]></item>
diff --git a/wcfsetup/install/lang/en.xml b/wcfsetup/install/lang/en.xml
index a15a776d1d..f77a81687d 100644
--- a/wcfsetup/install/lang/en.xml
+++ b/wcfsetup/install/lang/en.xml
@@ -736,6 +736,10 @@ Examples for medium ID detection:
 		<item name="wcf.acp.option.cookie_path"><![CDATA[Cookie Path]]></item>
 		<item name="wcf.acp.option.cookie_path.description"><![CDATA[Value should be absolute to Document Root, e.g. “/forum” for “http://www.woltlab.com/forum”.]]></item>
 		<item name="wcf.acp.option.cookie_prefix"><![CDATA[Cookie Prefix]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementCollision"><![CDATA[The alias “{$urlControllerReplacementError}” equals an existing controller and cannot be used.]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementDuplicateAlias"><![CDATA[The alias “{$urlControllerReplacementError}” is already in use.]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementDuplicateController"><![CDATA[The controller “{$urlControllerReplacementError}” has already been aliased.]]></item>
+		<item name="wcf.acp.option.error.controllerReplacementDuplicateUnknown"><![CDATA[The controller “{$urlControllerReplacementError}” is unknown.]]></item>
 		<item name="wcf.acp.option.error.tooHigh"><![CDATA[Exceeds the maximum value{if $option->maxvalue !== null} of {#$option->maxvalue}{/if}.]]></item>
 		<item name="wcf.acp.option.error.tooLow"><![CDATA[Below the minimum value{if $option->minvalue !== null} of {#$option->minvalue}{/if}.]]></item>
 		<item name="wcf.acp.option.export"><![CDATA[Download Options]]></item>
@@ -981,6 +985,12 @@ Examples for medium ID detection:
 Examples:<br />
 WBB=WoltLab Burning Board<br />
 GmbH=Gesellschaft mit beschränkter Haftung]]></item>
+		<item name="wcf.acp.option.url_controller_replacement"><![CDATA[Controller Aliasing]]></item>
+		<item name="wcf.acp.option.url_controller_replacement.description"><![CDATA[You can rename controllers by assigning an alias to them, please provide only one alias per line. Aliases must be defined as “real-name=custom-name” and contain only lower-case a-z, the numbers 0-9 and the dash for compatibility reasons. Examples:
+<ul class="nativeList">
+	<li>“board-list=forums”, the link “http://example.com/index.php?board-list/” will turn into “http://example.com/index.php?forums/”</li>
+	<li>“members-list=profiles”, the link “http://example.com/index.php?members-list/” will turn into “http://example.com/index.php?profiles/”</li>
+</ul>]]></item>
 		<item name="wcf.acp.option.users_online_enable_legend"><![CDATA[Display legend for “Users Online” list]]></item>
 		<item name="wcf.acp.option.category.general.system.googleMaps"><![CDATA[Google Maps]]></item>
 		<item name="wcf.acp.option.google_maps_zoom"><![CDATA[Map Zoom]]></item>
@@ -1004,15 +1014,13 @@ GmbH=Gesellschaft mit beschränkter Haftung]]></item>
 		<item name="wcf.acp.option.module_cookie_policy_page"><![CDATA[Enable explanation on “Cookie Usage”]]></item>
 		<item name="wcf.acp.option.module_cookie_policy_page.description"><![CDATA[Displays a notice on cookie usage according to EU Directive 2009/136/EG upon first visit.]]></item>
 		<item name="wcf.acp.option.url_omit_index_php"><![CDATA[Enable URL-Rewrite]]></item>
-		<item name="wcf.acp.option.url_omit_index_php.description"><![CDATA[Rewrites URLs into a better readable representation, turning links like “http://example.com/?Thread/1-Hello-I-am-John-Doe/” into “http://example.com/thread/1-hello-i-am-john-doe/” and similar. Heads up! This option requires a rewrite module installed on your webserver and an appropriate configuration; It will not work without any prior configuration applied by you!]]></item>
+		<item name="wcf.acp.option.url_omit_index_php.description"><![CDATA[Rewrites URLs into a better readable representation, turning links like “http://example.com/index.php?thread/1-hello-i-am-john-doe/” into “http://example.com/thread/1-hello-i-am-john-doe/” and similar. Heads up! This option requires a rewrite module installed on your webserver and an appropriate configuration; It will not work without any prior configuration applied by you!]]></item>
 		<item name="wcf.acp.option.url_legacy_mode"><![CDATA[Enable link compatibility mode]]></item>
 		<item name="wcf.acp.option.url_legacy_mode.description"><![CDATA[Enabling this option forces the system to use WoltLab Community Framework 2.0-compilant URLs and should only be used to ensure compatibility with legacy URLs:
 <ul class="nativeList">
 	<li>WCF 2.0: “index.php/Thread/123-Title/”</li>
-	<li>WCF 2.1+: “?Thread/123-Title/”</li>
+	<li>WCF 2.1+: “index.php?thread/123-title/”</li>
 </ul>]]></item>
-		<item name="wcf.acp.option.url_to_lowercase"><![CDATA[Force lower-case links]]></item>
-		<item name="wcf.acp.option.url_to_lowercase.description"><![CDATA[Links will no longer contain uppercase letters turning links like “Thread/1-Hello-I-am-John-Doe/” into “thread/1-hello-i-am-john-doe/”.]]></item>
 		<item name="wcf.acp.option.module_wcf_ad"><![CDATA[Ads]]></item>
 		<item name="wcf.acp.option.module_wcf_ad.description"><![CDATA[Enables the <a href="{link controller='AdList'}{/link}">advertisement management</a>.]]></item>
 		<item name="wcf.acp.option.captcha_type"><![CDATA[Captcha Type]]></item>
-- 
2.20.1