Created class `OC_USER_BACKEND` for general user managment

It's possible to use `OC_USER` as normal but the real stuff
is done by the `OC_USER::$_backend` class, setted using
`OC_USER::setBackend()` (this is done in inc/lib_user.php)

7 files changed, 590 insertions, 465 deletions

diff --git a/inc/User/backend.php b/inc/User/backend.php
new file mode 100755
index 00000000000..a036f061443
--- /dev/null
+++ b/inc/User/backend.php
@@ -0,0 +1,123 @@
+<?php
+
+/**
+* ownCloud
+*
+* @author Frank Karlitschek 
+* @copyright 2010 Frank Karlitschek karlitschek@kde.org 
+* 
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+* License as published by the Free Software Foundation; either 
+* version 3 of the License, or any later version.
+* 
+* This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
+*  
+* You should have received a copy of the GNU Lesser General Public 
+* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+* 
+*/
+
+
+
+/**
+ * Base class for user management
+ *
+ * @author Aldo "xoen" Giambelluca <xoen@xoen.org>
+ * @author fabian <fabian@web2.0-apps.de>
+ */
+abstract class OC_USER_BACKEND {
+
+	/**
+	 * Check if the login button is pressed and logg the user in
+	 *
+	 */
+	abstract public static function loginLisener();
+
+	/**
+	 * Try to create a new user
+	 *
+	 */
+	abstract public static function createUser($username, $password);
+
+	/**
+	 * Try to login a user
+	 *
+	 */
+	abstract public static function login($username, $password);
+
+	/**
+	 * Check if the logout button is pressed and logout the user
+	 *
+	 */
+	abstract public static function logoutLisener();
+
+	/**
+	 * Check if a user is logged in
+	 *
+	 */
+	abstract public static function isLoggedIn();
+
+	/**
+	 * Try to create a new group
+	 *
+	 */
+	abstract public static function createGroup($groupName);
+
+	/**
+	 * Get the ID of a user
+	 *
+	 */
+	abstract public static function getUserId($username, $noCache=false);
+
+	/**
+	 * Get the ID of a group
+	 *
+	 */
+	abstract public static function getGroupId($groupName, $noCache=false);
+
+	/**
+	 * Get the name of a group
+	 *
+	 */
+	abstract public static function getGroupName($groupId, $noCache=false);
+
+	/**
+	 * Check if a user belongs to a group
+	 *
+	 */
+	abstract public static function inGroup($username, $groupName);
+
+	/**
+	 * Add a user to a group
+	 *
+	 */
+	abstract public static function addToGroup($username, $groupName);
+
+	/**
+	 * Generate a random password
+	 */
+	abstract public static function generatePassword();
+
+	/**
+	 * Get all groups the user belongs to
+	 *
+	 */
+	abstract public static function getUserGroups($username);
+
+	/**
+	 * Set the password of a user
+	 *
+	 */
+	abstract public static function setPassword($username, $password);
+
+	/**
+	 * Check the password of a user
+	 *
+	 */
+	abstract public static function checkPassword($username, $password);
+
+}
diff --git a/inc/User/database.php b/inc/User/database.php
index c4239eb07cd..13880f1f662 100755
--- a/inc/User/database.php
+++ b/inc/User/database.php
@@ -21,307 +21,292 @@
 * 
 */
 
-require_once $SERVERROOT . '/inc/lib_user.php';
+oc_require_once('inc/User/backend.php');
 
 
 
 /**
- * Class for usermanagement in a SQL Database (e.g. MySQL, SQLite)
+ * Class for user management in a SQL Database (e.g. MySQL, SQLite)
  *
  */
-class OC_USER_DATABASE extends OC_USER_ABSTRACT {
+class OC_USER_DATABASE extends OC_USER_BACKEND {
 
 	/**
-	 * Check if the login button is pressed and logg the user in
-	 *
-	 */
-	public static function loginLisener() {
-		if ( isset($_POST['loginbutton']) AND isset($_POST['password']) AND isset($_POST['login']) ) {
-			if ( self::login($_POST['login'], $_POST['password']) ) {
+	* check if the login button is pressed and logg the user in
+	*
+	*/
+	public static function loginLisener(){
+		if(isset($_POST['loginbutton']) and isset($_POST['password']) and isset($_POST['login'])){
+			if(OC_USER::login($_POST['login'],$_POST['password'])){
 				echo 1;
-				OC_LOG::event($_SESSION['username'], 1, '');
+				OC_LOG::event($_SESSION['username'],1,'');
 				echo 2;
-				if ( ( isset($CONFIG_HTTPFORCESSL) AND $CONFIG_HTTPFORCESSL )
-				     OR ( isset($_SERVER['HTTPS']) AND ('on' === $_SERVER['HTTPS']) ) ) {
-					$url = 'https://' . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];
-				} else {
-					$url = 'http://'. $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];
+				if((isset($CONFIG_HTTPFORCESSL) and $CONFIG_HTTPFORCESSL) or isset($_SERVER['HTTPS']) and $_SERVER['HTTPS'] == 'on') { 
+					$url = "https://". $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI']; 
+				}else{
+					$url = "http://". $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI']; 
 				}
-				header('Location: $url');
+				header("Location: $url");
 				die();
-			} else {
-				return 'error';
-			}
+			}else{
+				return('error');
+			} 
 		}
-
 		return('');
 	}
 
 	/**
-	 * Try to create a new user
-	 *
-	 */
-	public static function createUser($username, $password) {
+	* try to create a new user
+	*
+	*/
+	public static function createUser($username,$password){
 		global $CONFIG_DBTABLEPREFIX;
-
-		if ( 0 !== self::getUserId($username, true) ) {
+		if(OC_USER::getuserid($username,true)!=0){
 			return false;
-		} else {
-			$usernameClean = strtolower($username);
-			$password = sha1($password);
-			$username = OC_DB::escape($username);
-			$usernameClean = OC_DB::escape($usernameClean);
-			$query = "INSERT INTO  `{$CONFIG_DBTABLEPREFIX}users` (`user_name` ,`user_name_clean` ,`user_password`) VALUES ('$username',  '$usernameClean',  '$password')";
-			$result = OC_DB::query($query);
-
-			return ($result) ? true : false;
+		}else{
+			$usernameclean=strtolower($username);
+			$password=sha1($password);
+			$username=OC_DB::escape($username);
+			$usernameclean=OC_DB::escape($usernameclean);
+			$query="INSERT INTO  `{$CONFIG_DBTABLEPREFIX}users` (`user_name` ,`user_name_clean` ,`user_password`) VALUES ('$username',  '$usernameclean',  '$password')";
+			$result=OC_DB::query($query);
+			return ($result)?true:false;
 		}
-	}
 
+	}
+	
 	/**
-	 * Try to login a user
-	 *
-	 */
-	public static function login($username, $password) {
+	* try to login a user
+	*
+	*/
+	public static function login($username,$password){
 		global $CONFIG_DBTABLEPREFIX;
 
-		$password = sha1($password);
-		$usernameClean = strtolower($username);
-		$username = OC_DB::escape($username);
-		$usernameClean = OC_DB::escape($usernameClean);
-		$query = "SELECT user_id FROM {$CONFIG_DBTABLEPREFIX}users WHERE user_name_clean = '$usernameClean' AND  user_password =  '$password' LIMIT 1";
-		$result = OC_DB::select($query);
-		if ( isset($result[0]) AND isset($result[0]['user_id']) ) {
-			$_SESSION['user_id'] = $result[0]['user_id'];
-			$_SESSION['username'] = $username;
-			$_SESSION['username_clean'] = $usernameClean;
-
+		$password=sha1($password);
+		$usernameclean=strtolower($username);
+		$username=OC_DB::escape($username);
+		$usernameclean=OC_DB::escape($usernameclean);
+		$query = "SELECT user_id FROM {$CONFIG_DBTABLEPREFIX}users WHERE user_name_clean = '$usernameclean' AND  user_password =  '$password' LIMIT 1";
+		$result=OC_DB::select($query);
+		if(isset($result[0]) && isset($result[0]['user_id'])){
+			$_SESSION['user_id']=$result[0]['user_id'];
+			$_SESSION['username']=$username;
+			$_SESSION['username_clean']=$usernameclean;
 			return true;
-		} else {
+		}else{
 			return false;
 		}
 	}
-
+	
 	/**
-	 * Check if the logout button is pressed and logout the user
-	 *
-	 */
-	public static function logoutLisener() {
-		if ( isset($_GET['logoutbutton']) AND isset($_SESSION['username']) ) {
-			OC_LOG::event($_SESSION['username'], 2, '');
-			$_SESSION['user_id'] = false;
-			$_SESSION['username'] = '';
-			$_SESSION['username_clean'] = '';
+	* check if the logout button is pressed and logout the user
+	*
+	*/
+	public static function logoutLisener(){
+		if(isset($_GET['logoutbutton']) && isset($_SESSION['username'])){
+			OC_LOG::event($_SESSION['username'],2,'');
+			$_SESSION['user_id']=false;
+			$_SESSION['username']='';
+			$_SESSION['username_clean']='';
 		}
 	}
-
+	
 	/**
-	 * Check if a user is logged in
-	 *
-	 */
-	public static function isLoggedIn() {
-		if ( isset($_SESSION['user_id']) AND $_SESSION['user_id'] ) {
-			return true;
-		} else {
-			return false;
-		}
+	* check if a user is logged in
+	*
+	*/
+	public static function isLoggedIn(){
+		return (isset($_SESSION['user_id']) && $_SESSION['user_id'])?true:false;
 	}
-
+	
 	/**
-	 * Try to create a new group
-	 *
-	 */
-	public static function createGroup($groupName) {
+	* try to create a new group
+	*
+	*/
+	public static function createGroup($groupname){
 		global $CONFIG_DBTABLEPREFIX;
-
-		if ( 0 === self::getGroupId($groupName, true) ) {
-			$groupName = OC_DB::escape($groupName);
-			$query = "INSERT INTO  `{$CONFIG_DBTABLEPREFIX}groups` (`group_name`) VALUES ('$groupName')";
-			$result = OC_DB::query($query);
-
-			return $result ? true : false;
-		} else {
+		if(OC_USER::getgroupid($groupname,true)==0){
+			$groupname=OC_DB::escape($groupname);
+			$query="INSERT INTO  `{$CONFIG_DBTABLEPREFIX}groups` (`group_name`) VALUES ('$groupname')";
+			$result=OC_DB::query($query);
+			return ($result)?true:false;
+		}else{
 			return false;
 		}
 	}
-
+	
 	/**
-	 * Get the ID of a user
-	 *
-	 */
-	public static function getUserId($username, $noCache=false) {
+	* get the id of a user
+	*
+	*/
+	public static function getUserId($username,$nocache=false){
 		global $CONFIG_DBTABLEPREFIX;
-
-		$usernameClean = strtolower($username);
-		//try to use cached value to save an sql query
-		if ( !$noCache AND isset($_SESSION['user_id_cache'][$usernameClean]) ) {
-			return $_SESSION['user_id_cache'][$usernameClean];
+		$usernameclean=strtolower($username);
+		if(!$nocache and isset($_SESSION['user_id_cache'][$usernameclean])){//try to use cached value to save an sql query
+			return $_SESSION['user_id_cache'][$usernameclean];
 		}
-		$usernameClean = OC_DB::escape($usernameClean);
-		$query = "SELECT user_id FROM {$CONFIG_DBTABLEPREFIX}users WHERE user_name_clean = '$usernameClean'";
-		$result = OC_DB::select($query);
-		if ( !is_array($result) ) {
+		$usernameclean=OC_DB::escape($usernameclean);
+		$query="SELECT user_id FROM {$CONFIG_DBTABLEPREFIX}users WHERE user_name_clean = '$usernameclean'";
+		$result=OC_DB::select($query);
+		if(!is_array($result)){
 			return 0;
 		}
-		if ( isset($result[0]) AND isset($result[0]['user_id']) ) {
-			$_SESSION['user_id_cache'][$usernameClean] = $result[0]['user_id'];
+		if(isset($result[0]) && isset($result[0]['user_id'])){
+			$_SESSION['user_id_cache'][$usernameclean]=$result[0]['user_id'];
 			return $result[0]['user_id'];
-		} else {
+		}else{
 			return 0;
 		}
 	}
-
+	
 	/**
-	 * Get the ID of a group
-	 *
-	 */
-	public static function getGroupId($groupName, $noCache=false) {
+	* get the id of a group
+	*
+	*/
+	public static function getGroupId($groupname,$nocache=false){
 		global $CONFIG_DBTABLEPREFIX;
-
-		//try to use cached value to save an sql query
-		if ( !$noCache AND isset($_SESSION['group_id_cache'][$groupName]) ) {
-			return $_SESSION['group_id_cache'][$groupName];
+		if(!$nocache and isset($_SESSION['group_id_cache'][$groupname])){//try to use cached value to save an sql query
+			return $_SESSION['group_id_cache'][$groupname];
 		}
-		$groupName = OC_DB::escape($groupName);
-		$query = "SELECT group_id FROM {$CONFIG_DBTABLEPREFIX}groups WHERE group_name = '$groupName'";
-		$result = OC_DB::select($query);
-		if ( !is_array($result) ) {
+		$groupname=OC_DB::escape($groupname);
+		$query="SELECT group_id FROM {$CONFIG_DBTABLEPREFIX}groups WHERE group_name = '$groupname'";
+		$result=OC_DB::select($query);
+		if(!is_array($result)){
 			return 0;
 		}
-		if ( isset($result[0]) AND isset($result[0]['group_id']) ) {
-			$_SESSION['group_id_cache'][$groupName] = $result[0]['group_id'];
-
+		if(isset($result[0]) && isset($result[0]['group_id'])){
+			$_SESSION['group_id_cache'][$groupname]=$result[0]['group_id'];
 			return $result[0]['group_id'];
-		} else {
+		}else{
 			return 0;
 		}
 	}
-
+	
 	/**
-	 * Get the name of a group
-	 *
-	 */
-	public static function getGroupName($groupId, $noCache=false) {
+	* get the name of a group
+	*
+	*/
+	public static function getGroupName($groupid,$nocache=false){
 		global $CONFIG_DBTABLEPREFIX;
-
-		//try to use cached value to save an sql query
-		if ( !$noCache AND ($name = array_search($groupId,$_SESSION['group_id_cache'])) ) {
+		if($nocache and $name=array_search($groupid,$_SESSION['group_id_cache'])){//try to use cached value to save an sql query
 			return $name;
 		}
-		$groupId = (integer)$groupId;
-		$query = "SELECT group_name FROM {$CONFIG_DBTABLEPREFIX}groups WHERE group_id = '$groupId' LIMIT 1";
-		$result = OC_DB::select($query);
-		if ( isset($result[0]) AND isset($result[0]['group_name']) ) {
+		$groupid=(integer)$groupid;
+		$query="SELECT group_name FROM {$CONFIG_DBTABLEPREFIX}groups WHERE group_id = '$groupid' LIMIT 1";
+		$result=OC_DB::select($query);
+		if(isset($result[0]) && isset($result[0]['group_name'])){
 			return $result[0]['group_name'];
-		} else {
+		}else{
 			return 0;
 		}
 	}
-
+	
 	/**
-	 * Check if a user belongs to a group
-	 *
-	 */
-	public static function inGroup($username, $groupName) {
+	* check if a user belongs to a group
+	*
+	*/
+	public static function inGroup($username,$groupname){
 		global $CONFIG_DBTABLEPREFIX;
 
-		$userId = self::getUserId($username);
-		$groupId = self::getGroupId($groupName);
-		if ( ($groupId > 0) AND ($userId > 0) ) {
-			$query = "SELECT * FROM  {$CONFIG_DBTABLEPREFIX}user_group WHERE group_id = '$groupId'  AND user_id = '$userId';";
-			$result = OC_DB::select($query);
-			if ( isset($result[0]) AND isset($result[0]['user_group_id']) ) {
+		$userid=OC_USER::getuserid($username);
+		$groupid=OC_USER::getgroupid($groupname);
+		if($groupid>0 and $userid>0){
+			$query="SELECT * FROM  {$CONFIG_DBTABLEPREFIX}user_group WHERE group_id = '$groupid'  AND user_id = '$userid';";
+			$result=OC_DB::select($query);
+			if(isset($result[0]) && isset($result[0]['user_group_id'])){
 				return true;
-			} else {
+			}else{
 				return false;
 			}
-		} else {
+		}else{
 			return false;
 		}
 	}
-
+	
 	/**
-	 * Add a user to a group
-	 *
-	 */
-	public static function addToGroup($username, $groupName) {
+	* add a user to a group
+	*
+	*/
+	public static function addToGroup($username,$groupname){
 		global $CONFIG_DBTABLEPREFIX;
 
-		if ( !self::inGroup($username, $groupName) ) {
-			$userId = self::getuserid($username);
-			$groupId = self::getgroupid($groupName);
-			if ( (0 !== $groupId) AND (0 !== $userId) ) {
-				$query = "INSERT INTO `{$CONFIG_DBTABLEPREFIX}user_group` (`user_id` ,`group_id`) VALUES ('$userId',  '$groupId');";
-				$result = OC_DB::query($query);
-				if ( $result ) {
+		if(!OC_USER::ingroup($username,$groupname)){
+			$userid=OC_USER::getuserid($username);
+			$groupid=OC_USER::getgroupid($groupname);
+			if($groupid!=0 and $userid!=0){
+				$query="INSERT INTO `{$CONFIG_DBTABLEPREFIX}user_group` (`user_id` ,`group_id`) VALUES ('$userid',  '$groupid');";
+				$result=OC_DB::query($query);
+				if($result){
 					return true;
-				} else {
+				}else{
 					return false;
 				}
-			} else {
+			}else{
 				return false;
 			}
-		} else {
+		}else{
 			return true;
 		}
 	}
-
-	public static function generatePassword() {
-		return uniqId();
+	
+	public static function generatePassword(){
+		return uniqid();
 	}
 
 	/**
-	 * Get all groups the user belongs to
-	 *
-	 */
-	public static function getUserGroups($username) {
+	* get all groups the user belongs to
+	*
+	*/
+	public static function getUserGroups($username){
 		global $CONFIG_DBTABLEPREFIX;
 
-		$userId = self::getUserId($username);
-		$query = "SELECT group_id FROM {$CONFIG_DBTABLEPREFIX}user_group WHERE user_id = '$userId'";
-		$result = OC_DB::select($query);
-		$groups = array();
-		if ( is_array($result) ) {
-			foreach ( $result as $group ) {
-				$groupId = $group['group_id'];
-				$groups[] = self::getGroupName($groupId);
+		$userid=OC_USER::getuserid($username);
+		$query = "SELECT group_id FROM {$CONFIG_DBTABLEPREFIX}user_group WHERE user_id = '$userid'";
+		$result=OC_DB::select($query);
+		$groups=array();
+		if(is_array($result)){
+			foreach($result as $group){
+				$groupid=$group['group_id'];
+				$groups[]=OC_USER::getgroupname($groupid);
 			}
 		}
-
 		return $groups;
 	}
-
+	
 	/**
-	 * Set the password of a user
-	 *
-	 */
-	public static function setPassword($username, $password) {
+	* set the password of a user
+	*
+	*/
+	public static function setPassword($username,$password){
 		global $CONFIG_DBTABLEPREFIX;
 
-		$password = sha1($password);
-		$userId = self::getUserId($username);
-		$query = "UPDATE {$CONFIG_DBTABLEPREFIX}users SET user_password = '$password' WHERE user_id ='$userId'";
-		$result = OC_DB::query($query);
-
-		return $result ? true : false;
+		$password=sha1($password);
+		$userid=OC_USER::getuserid($username);
+		$query = "UPDATE {$CONFIG_DBTABLEPREFIX}users SET user_password = '$password' WHERE user_id ='$userid'";
+		$result=OC_DB::query($query);
+		if($result){
+			return true;
+		}else{
+			return false;
+		}
 	}
 
 	/**
-	* Check the password of a user
+	* check the password of a user
 	*
 	*/
-	public static function checkPassword($username, $password) {
+	public static function checkPassword($username,$password){
 		global $CONFIG_DBTABLEPREFIX;
 
-		$password = sha1($password);
-		$usernameClean = strtolower($username);
-		$username = OC_DB::escape($username);
-		$usernameClean = OC_DB::escape($usernameClean);
-		$query = "SELECT user_id FROM '{$CONFIG_DBTABLEPREFIX}users' WHERE user_name_clean = '$usernameClean' AND user_password =  '$password' LIMIT 1";
-		$result = OC_DB::select($query);
-		if ( isset($result[0]) AND isset($result[0]['user_id']) AND ($result[0]['user_id'] > 0) ) {
+		$password=sha1($password);
+		$usernameclean=strtolower($username);
+		$username=OC_DB::escape($username);
+		$usernameclean=OC_DB::escape($usernameclean);
+		$query = "SELECT user_id FROM '{$CONFIG_DBTABLEPREFIX}users' WHERE user_name_clean = '$usernameclean' AND user_password =  '$password' LIMIT 1";
+		$result=OC_DB::select($query);
+		if(isset($result[0]) && isset($result[0]['user_id']) && $result[0]['user_id']>0){
 			return true;
-		} else {
+		}else{
 			return false;
 		}
 	}
diff --git a/inc/User/ldap.php b/inc/User/ldap.php
index 9ce36975bd3..c91f900342e 100755
--- a/inc/User/ldap.php
+++ b/inc/User/ldap.php
@@ -21,13 +21,9 @@
 * 
 */
 
-require_once $SERVERROOT . '/inc/lib_user.php';
-require_once $SERVERROOT . '/inc/User/mod_auth.php';
+oc_require_once('inc/User/mod_auth.php');
 
 
 
-/**
- * Class for usermanagement in a SQL Database (e.g. MySql, SQLite)
- */
 class OC_USER_LDAP extends OC_USER_MOD_AUTH {
 }
diff --git a/inc/User/mod_auth.php b/inc/User/mod_auth.php
index 8bab4394a5d..0595e74024b 100755
--- a/inc/User/mod_auth.php
+++ b/inc/User/mod_auth.php
@@ -21,55 +21,52 @@
 * 
 */
 
-require_once $SERVERROOT . '/inc/lib_user.php';
+oc_require_once('inc/User/backend.php');
 
 
 
 /**
- * Class for usermanagement in a SQL Database (e.g. MySQL, SQLite)
+ * Class for user management
  *
  */
-class OC_USER_MOD_AUTH extends OC_USER_ABSTRACT {
-	
+class OC_USER_MOD_AUTH extends OC_USER_BACKEND {
+
 	/**
-	 * Check if the login button is pressed and logg the user in
-	 *
-	 */
-	public static function loginLisener() {
-		return '';
+	* check if the login button is pressed and logg the user in
+	*
+	*/
+	public static function loginLisener(){
+		return('');
 	}
-	
-	
+
 	/**
-	 * Try to create a new user
-	 *
-	 */
-	public static function createUser($username, $password) {
+	* try to create a new user
+	*
+	*/
+	public static function createUser($username,$password){
 		return false;
 	}
-	
-	/**
-	 * Try to login a user
-	 *
-	 */
-	public static function login($username, $password) {
-		if ( isset($_SERVER['PHP_AUTH_USER']) AND ('' !== $_SERVER['PHP_AUTH_USER']) ) {
-			$_SESSION['user_id'] = $_SERVER['PHP_AUTH_USER'];
-			$_SESSION['username'] = $_SERVER['PHP_AUTH_USER'];
-			$_SESSION['username_clean'] = $_SERVER['PHP_AUTH_USER'];
 
+	/**
+	* try to login a user
+	*
+	*/
+	public static function login($username,$password){
+		if (isset($_SERVER["PHP_AUTH_USER"]) && $_SERVER["PHP_AUTH_USER"] != "") {
+			$_SESSION['user_id']= $_SERVER["PHP_AUTH_USER"];
+			$_SESSION['username']= $_SERVER["PHP_AUTH_USER"];
+			$_SESSION['username_clean']= $_SERVER["PHP_AUTH_USER"];
 			return true;
 		}
-
 		return false;
 	}
 	
 	/**
-	 * Check if the logout button is pressed and logout the user
-	 *
-	 */
-	public static function logoutLisener() {
-		if ( isset($_GET['logoutbutton']) AND isset($_SESSION['username']) ) {
+	* check if the logout button is pressed and logout the user
+	*
+	*/
+	public static function logoutLisener(){
+		if(isset($_GET['logoutbutton']) && isset($_SESSION['username'])){
 			header('WWW-Authenticate: Basic realm="ownCloud"');
 			header('HTTP/1.0 401 Unauthorized');
 			die('401 Unauthorized');
@@ -77,107 +74,105 @@ class OC_USER_MOD_AUTH extends OC_USER_ABSTRACT {
 	}
 	
 	/**
-	 * Check if a user is logged in
-	 *
-	 */
-	public static function isLoggedIn() {
-		if ( isset($_SESSION['user_id']) AND $_SESSION['user_id'] ) {
+	* check if a user is logged in
+	*
+	*/
+	public static function isLoggedIn(){
+		if (isset($_SESSION['user_id']) && $_SESSION['user_id']) {
 			return true;
-		} else {
-			if ( isset($_SERVER['PHP_AUTH_USER']) AND ('' !== $_SERVER['PHP_AUTH_USER']) ) {
-				$_SESSION['user_id'] = $_SERVER['PHP_AUTH_USER'];
-				$_SESSION['username'] = $_SERVER['PHP_AUTH_USER'];
-				$_SESSION['username_clean'] = $_SERVER['PHP_AUTH_USER'];
-
-				return true;;
+		}
+		else {
+			if (isset($_SERVER["PHP_AUTH_USER"]) && $_SERVER["PHP_AUTH_USER"] != "") {
+				$_SESSION['user_id']= $_SERVER["PHP_AUTH_USER"];
+				$_SESSION['username']= $_SERVER["PHP_AUTH_USER"];
+				$_SESSION['username_clean']= $_SERVER["PHP_AUTH_USER"];
+				return true;
 			}
 		}
-
 		return false;
 	}
 	
 	/**
-	 * Try to create a new group
-	 *
-	 */
-	public static function createGroup($groupName) {
+	* try to create a new group
+	*
+	*/
+	public static function createGroup($groupname){
 		// does not work with MOD_AUTH (only or some modules)
 		return false;
 	}
 	
 	/**
-	 * Get the ID of a user
-	 *
-	 */
-	public static function getUserId($username, $noCache=false) {
+	* get the id of a user
+	*
+	*/
+	public static function getUserId($username,$nocache=false){
 		// does not work with MOD_AUTH (only or some modules)
 		return 0;
 	}
 	
 	/**
-	 * Get the ID of a group
-	 *
-	 */
-	public static function getGroupId($groupName, $noCache=false) {
+	* get the id of a group
+	*
+	*/
+	public static function getGroupId($groupname,$nocache=false){
 		// does not work with MOD_AUTH (only or some modules)
 		return 0;
 	}
 	
 	/**
-	 * Get the name of a group
-	 *
-	 */
-	public static function getGroupName($groupId, $noCache=false) {
+	* get the name of a group
+	*
+	*/
+	public static function getGroupName($groupid,$nocache=false){
 		// does not work with MOD_AUTH (only or some modules)
 		return 0;
 	}
 	
 	/**
-	 * Check if a user belongs to a group
-	 *
-	 */
-	public static function inGroup($username, $groupName) {
+	* check if a user belongs to a group
+	*
+	*/
+	public static function inGroup($username,$groupname){
 		// does not work with MOD_AUTH (only or some modules)
 		return false;
 	}
 	
 	/**
-	 * Add a user to a group
-	 *
-	 */
-	public static function addToGroup($username, $groupName) {
+	* add a user to a group
+	*
+	*/
+	public static function addToGroup($username,$groupname){
 		// does not work with MOD_AUTH (only or some modules)
 		return false;
 	}
 	
-	public static function generatePassword() {
-		return uniqId();
+	public static function generatePassword(){
+		return uniqid();
 	}
 	
 	/**
-	 * Get all groups the user belongs to
-	 *
-	 */
-	public static function getUserGroups($username) {
+	* get all groups the user belongs to
+	*
+	*/
+	public static function getUserGroups($username){
 		// does not work with MOD_AUTH (only or some modules)
-		$groups = array();
-
+		$groups=array();
 		return $groups;
 	}
 	
 	/**
-	 * Set the password of a user
-	 *
-	 */
-	public static function setPassword($username, $password) {
+	* set the password of a user
+	*
+	*/
+	public static function setPassword($username,$password){
 		return false;
 	}
 	
 	/**
-	 * Check the password of a user
-	 *
-	 */
-	public static function checkPassword($username, $password) {
+	* check the password of a user
+	*
+	*/
+	public static function checkPassword($username,$password){
 		// does not work with MOD_AUTH (only or some modules)
 		return false;
 	}
diff --git a/inc/lib_base.php b/inc/lib_base.php
index 7068aad3f4e..df6df15cc23 100755
--- a/inc/lib_base.php
+++ b/inc/lib_base.php
@@ -48,20 +48,20 @@ if($WEBROOT!='' and $WEBROOT[0]!=='/'){
 // set_include_path(get_include_path().PATH_SEPARATOR.$SERVERROOT.PATH_SEPARATOR.$SERVERROOT.'/inc'.PATH_SEPARATOR.$SERVERROOT.'/config');
 
 // define default config values
-$CONFIG_INSTALLED = false;
-$CONFIG_DATADIRECTORY = $SERVERROOT . '/data';
-$CONFIG_BACKUPDIRECTORY = $SERVERROOT . '/backup';
-$CONFIG_HTTPFORCESSL = false;
-$CONFIG_ENABLEBACKUP = false;
-$CONFIG_DATEFORMAT = 'j M Y G:i';
-$CONFIG_DBNAME = 'owncloud';
-$CONFIG_DBTYPE = 'sqlite';
+$CONFIG_INSTALLED=false;
+$CONFIG_DATADIRECTORY=$SERVERROOT.'/data';
+$CONFIG_BACKUPDIRECTORY=$SERVERROOT.'/backup';
+$CONFIG_HTTPFORCESSL=false;
+$CONFIG_ENABLEBACKUP=false;
+$CONFIG_DATEFORMAT='j M Y G:i';
+$CONFIG_DBNAME='owncloud';
+$CONFIG_DBTYPE='sqlite';
 
 // include the generated configfile
-@include_once($SERVERROOT . '/config/config.php');
+@include_once($SERVERROOT.'/config/config.php');
 
-// Store this in a seperate variable so we can change the data directory to jail users.
-$CONFIG_DATADIRECTORY_ROOT = $CONFIG_DATADIRECTORY;
+
+$CONFIG_DATADIRECTORY_ROOT=$CONFIG_DATADIRECTORY;// store this in a seperate variable so we can change the data directory to jail users.
 // redirect to https site if configured
 if(isset($CONFIG_HTTPFORCESSL) and $CONFIG_HTTPFORCESSL){
   if(!isset($_SERVER['HTTPS']) or $_SERVER['HTTPS'] != 'on') { 
@@ -86,33 +86,10 @@ oc_require_once('lib_connect.php');
 oc_require_once('lib_remotestorage.php');
 
 
-
-// Load the choosen user manager
-if ( isset($CONFIG_BACKEND) ) {
-	switch ( $CONFIG_BACKEND ) {
-		case 'mysql':
-		case 'sqlite':
-			require_once 'User/database.php';
-			$userManager = new OC_USER_DATABASE();
-			break;
-		case 'ldap':
-			require_once 'User/ldap.php';
-			$userManager = new OC_USER_LDAP();
-			break;
-		default:
-			require_once 'User/database.php';
-			$userManager = new OC_USER_DATABASE();
-			break;
-	}
-} else {
-	require_once 'User/database.php';
-	$userManager = new OC_USER_DATABASE();
-}
-
 if(!is_dir($CONFIG_DATADIRECTORY_ROOT)){
 	@mkdir($CONFIG_DATADIRECTORY_ROOT) or die("Can't create data directory ($CONFIG_DATADIRECTORY_ROOT), you can usually fix this by setting the owner of '$SERVERROOT' to the user that the web server uses (www-data for debian/ubuntu)");
 }
-if ( $userManager::isLoggedIn() ) {
+if(OC_USER::isLoggedIn()){
 	//jail the user in a seperate data folder
 	$CONFIG_DATADIRECTORY=$CONFIG_DATADIRECTORY_ROOT.'/'.$_SESSION['username_clean'];
 	if(!is_dir($CONFIG_DATADIRECTORY)){
@@ -151,11 +128,11 @@ if(isset($plugins[0])) foreach($plugins as $plugin) require_once($SERVERROOT.'/p
 
 
 // check if the server is correctly configured for ownCloud
-OC_UTIL::checkServer();
+OC_UTIL::checkserver();
 
 // listen for login or logout actions
-$userManager::logoutLisener();
-$loginresult = $userManager::loginLisener();
+OC_USER::logoutlisener();
+$loginresult=OC_USER::loginlisener();
 
 /**
  * Class for utility functions
@@ -285,27 +262,25 @@ class OC_UTIL {
    * show the main navigation
    *
    */
-	public static function showNavigation(){
-		global $WEBROOT;
-		global $SERVERROOT;
-		global $userManager;
-
-		echo('<table class="center" cellpadding="5" cellspacing="0" border="0"><tr>');
-		echo('<td class="navigationitem1"><a href="'.$WEBROOT.'/">'.$_SESSION['username'].'</a></td>');
-		if ($_SERVER['SCRIPT_NAME']==$WEBROOT.'/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/">Files</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/">Files</a></td>');
+  public static function showNavigation(){
+    global $WEBROOT;
+    global $SERVERROOT;
+    echo('<table class="center" cellpadding="5" cellspacing="0" border="0"><tr>');
+    echo('<td class="navigationitem1"><a href="'.$WEBROOT.'/">'.$_SESSION['username'].'</a></td>');
+    if($_SERVER['SCRIPT_NAME']==$WEBROOT.'/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/">Files</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/">Files</a></td>');
 
-		foreach(OC_UTIL::$NAVIGATION as $NAVI) {
-			if(dirname($_SERVER['SCRIPT_NAME'])==$WEBROOT.$NAVI['url']) echo('<td class="navigationitemselected"><a href="'.$WEBROOT.$NAVI['url'].'">'.$NAVI['name'].'</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.$NAVI['url'].'">'.$NAVI['name'].'</a></td>');
-		}
+    foreach(OC_UTIL::$NAVIGATION as $NAVI) {
+      if(dirname($_SERVER['SCRIPT_NAME'])==$WEBROOT.$NAVI['url']) echo('<td class="navigationitemselected"><a href="'.$WEBROOT.$NAVI['url'].'">'.$NAVI['name'].'</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.$NAVI['url'].'">'.$NAVI['name'].'</a></td>');
+    }
 
-		if($_SERVER['SCRIPT_NAME']==$WEBROOT.'/log/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/log">Log</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/log">Log</a></td>');
-		if($_SERVER['SCRIPT_NAME']==$WEBROOT.'/settings/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/settings">Settings</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/settings">Settings</a></td>');
-		if ( $userManager::inGroup($_SESSION['username'], 'admin') ) {
-			if($_SERVER['SCRIPT_NAME']==$WEBROOT.'/admin/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/admin">Admin Panel</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/admin">Admin Panel</a></td>');
-		}
-		echo('<td class="navigationitem"><a href="?logoutbutton=1">Logout</a></td>');
-		echo('</tr></table>');
+	if($_SERVER['SCRIPT_NAME']==$WEBROOT.'/log/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/log">Log</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/log">Log</a></td>');
+	if($_SERVER['SCRIPT_NAME']==$WEBROOT.'/settings/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/settings">Settings</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/settings">Settings</a></td>');
+	if(OC_USER::ingroup($_SESSION['username'],'admin')){
+		if($_SERVER['SCRIPT_NAME']==$WEBROOT.'/admin/index.php') echo('<td class="navigationitemselected"><a href="'.$WEBROOT.'/admin">Admin Panel</a></td>'); else echo('<td class="navigationitem"><a href="'.$WEBROOT.'/admin">Admin Panel</a></td>');
 	}
+    echo('<td class="navigationitem"><a href="?logoutbutton=1">Logout</a></td>');
+    echo('</tr></table>');
+  }
 
 
   /**
diff --git a/inc/lib_config.php b/inc/lib_config.php
index 8418cd574e7..ff4ead8b6be 100644
--- a/inc/lib_config.php
+++ b/inc/lib_config.php
@@ -1,7 +1,5 @@
 <?php
-
-class OC_CONFIG {
-
+class OC_CONFIG{
    /**
    * show the configform
    *
@@ -16,74 +14,66 @@ class OC_CONFIG {
     oc_require('templates/configform.php');
   }
   
-	/**
-	* show the configform
-	*
-	*/
-	public static function showAdminForm(){
-		global $CONFIG_ADMINLOGIN;
-		global $CONFIG_ADMINPASSWORD;
-		global $CONFIG_DATADIRECTORY;
-		global $CONFIG_HTTPFORCESSL;
-		global $CONFIG_DATEFORMAT;
-		global $CONFIG_DBNAME;
-		global $CONFIG_DBTABLEPREFIX;
-		global $CONFIG_INSTALLED;
-
-		global $userManager;
-
-		$allow = false;
-		if ( !$CONFIG_INSTALLED ) {
-			$allow = true;
-		} elseif ( $userManager::isLoggedIn() ) {
-			if ( $userManager::inGroup($_SESSION['username'], 'admin') ) {
-				$allow = true;
+  /**
+   * show the configform
+   *
+   */
+  public static function showAdminForm(){
+    global $CONFIG_ADMINLOGIN;
+    global $CONFIG_ADMINPASSWORD;
+    global $CONFIG_DATADIRECTORY;
+    global $CONFIG_HTTPFORCESSL;
+    global $CONFIG_DATEFORMAT;
+    global $CONFIG_DBNAME;
+	global $CONFIG_DBTABLEPREFIX;
+    global $CONFIG_INSTALLED;
+		$allow=false;
+		if(!$CONFIG_INSTALLED){
+			$allow=true;
+		}elseif(OC_USER::isLoggedIn()){
+			if(OC_USER::ingroup($_SESSION['username'],'admin')){
+				$allow=true;
 			}
 		}
-
-		if ( $allow ) {
-			oc_require('templates/adminform.php');
-		}
+    if($allow){
+		oc_require('templates/adminform.php');
 	}
+  }
 
 	public static function createUserLisener(){
-		global $userManager;
-
-		if ( $userManager::isLoggedIn() ) {
-			if ( $userManager::ingroup($_SESSION['username'], 'admin') ) {
-				if ( isset($_POST['new_username']) AND isset($_POST['new_password']) ) {
-					if ( $userManager::createUser($_POST['new_username'], $_POST['new_password']) ) {
+		if(OC_USER::isLoggedIn()){
+			if(OC_USER::ingroup($_SESSION['username'],'admin')){
+				if(isset($_POST['new_username']) and isset($_POST['new_password'])){
+					if(OC_USER::createuser($_POST['new_username'],$_POST['new_password'])){
 						return 'user successfully created';
-					} else {
+					}else{
 						return 'error while trying to create user';
 					}
 				}else{
 					return false;
 				}
-			} else {
+			}else{
 				return false;
 			}
 		}
 	}
 	
-	public static function createGroupLisener() {
-		global $userManager;
-
-		if ( $userManager::isLoggedIn() ) {
-			if ( isset($_POST['creategroup']) AND 1==$_POST['creategroup'] ) {
-				if ( $userManager::createGroup($_POST['groupname']) ) {
-					if ( $userManager::addTogroup($_SESSION['username'], $_POST['groupname']) ) {
+	public static function createGroupLisener(){
+		if(OC_USER::isLoggedIn()){
+			if(isset($_POST['creategroup']) and $_POST['creategroup']==1){
+				if(OC_USER::creategroup($_POST['groupname'])){
+					if(OC_USER::addtogroup($_SESSION['username'],$_POST['groupname'])){
 						return 'group successfully created';
-					} else {
+					}else{
 						return 'error while trying to add user to the new created group';
 					}
-				} else {
+				}else{
 					return 'error while trying to create group';
 				}
-			} else {
+			}else{
 				return false;
 			}
-		} else {
+		}else{
 			return false;
 		}
 	}
@@ -93,13 +83,11 @@ class OC_CONFIG {
    * lisen for configuration changes
    *
    */
-	public static function configLisener() {
-		global $userManager;
-
-		if($userManager::isLoggedIn()){
+	public static function configLisener(){
+		if(OC_USER::isLoggedIn()){
 			if(isset($_POST['config']) and $_POST['config']==1){
 				$error='';
-				if(!$userManager::checkpassword($_SESSION['username'],$_POST['currentpassword'])){
+				if(!OC_USER::checkpassword($_SESSION['username'],$_POST['currentpassword'])){
 					$error.='wrong password<br />';
 				}else{
 					if(isset($_POST['changepass']) and $_POST['changepass']==1){
@@ -107,7 +95,7 @@ class OC_CONFIG {
 						if(!isset($_POST['password2'])    or empty($_POST['password2']))    $error.='retype password not set<br />';
 						if($_POST['password']<>$_POST['password2'] )                        $error.='passwords are not the same<br />';
 						if(empty($error)){
-							if(!$userManager::setpassword($_SESSION['username'],$_POST['password'])){
+							if(!OC_USER::setpassword($_SESSION['username'],$_POST['password'])){
 								$error.='error while trying to set password<br />';
 							}
 						}
@@ -155,13 +143,11 @@ class OC_CONFIG {
 	*/
 	public static function writeAdminLisener(){
 		global $CONFIG_INSTALLED;
-		global $userManager;
-
 		$allow=false;
 		if(!$CONFIG_INSTALLED){
 			$allow=true;
-		}elseif($userManager::isLoggedIn()){
-			if($userManager::ingroup($_SESSION['username'],'admin')){
+		}elseif(OC_USER::isLoggedIn()){
+			if(OC_USER::ingroup($_SESSION['username'],'admin')){
 				$allow=true;
 			}
 		}
@@ -184,7 +170,7 @@ class OC_CONFIG {
 				$error='';
 				$FIRSTRUN=!$CONFIG_INSTALLED;
 				if(!$FIRSTRUN){
-					if(!$userManager::login($_SESSION['username'],$_POST['currentpassword'])){
+					if(!OC_USER::login($_SESSION['username'],$_POST['currentpassword'])){
 					$error.='wrong password<br />';
 					}
 				}
@@ -262,15 +248,15 @@ class OC_CONFIG {
 						}
 					}
 					if($FIRSTRUN){
-						if(!$userManager::createuser($_POST['adminlogin'],$_POST['adminpassword']) && !$userManager::login($_POST['adminlogin'],$_POST['adminpassword'])){
+						if(!OC_USER::createuser($_POST['adminlogin'],$_POST['adminpassword']) && !OC_USER::login($_POST['adminlogin'],$_POST['adminpassword'])){
 							$error.='error while trying to create the admin user<br/>';
 						}
-						if($userManager::getgroupid('admin')==0){
-							if(!$userManager::creategroup('admin')){
+						if(OC_USER::getgroupid('admin')==0){
+							if(!OC_USER::creategroup('admin')){
 								$error.='error while trying to create the admin group<br/>';
 							}
 						}
-						if(!$userManager::addtogroup($_POST['adminlogin'],'admin')){
+						if(!OC_USER::addtogroup($_POST['adminlogin'],'admin')){
 							$error.='error while trying to add the admin user to the admin group<br/>';
 						}
 					}
@@ -379,3 +365,6 @@ class OC_CONFIG {
 		}
 	}
 }
+?>
+
+
diff --git a/inc/lib_user.php b/inc/lib_user.php
index 394377984cb..e20c5624f12 100755
--- a/inc/lib_user.php
+++ b/inc/lib_user.php
@@ -21,6 +21,8 @@
 * 
 */
 
+global $CONFIG_BACKEND;
+
 
 
 if ( !$CONFIG_INSTALLED ) {
@@ -29,7 +31,7 @@ if ( !$CONFIG_INSTALLED ) {
 	$_SESSION['username_clean'] = '';
 }
 
-// Cache the userid's an groupid's
+//cache the userid's an groupid's
 if ( !isset($_SESSION['user_id_cache']) ) {
 	$_SESSION['user_id_cache'] = array();
 }
@@ -37,98 +39,158 @@ if ( !isset($_SESSION['group_id_cache']) ) {
 	$_SESSION['group_id_cache'] = array();
 }
 
+OC_USER::setBackend($CONFIG_BACKEND);
+
 
 
 /**
- * Class for user management
+ * Class for User Management
  *
  */
-abstract class OC_USER_ABSTRACT {
+class OC_USER {
+
+	// The backend used for user management
+	private static $_backend;
+
+	/**
+	* Set the User Authentication Module
+	*/
+	public static function setBackend($backend='database') {
+		if ( (null === $backend) OR (!is_string($backend)) ) {
+			$backend = 'database';
+		}
+
+		switch ( $backend ) {
+			case 'mysql':
+			case 'sqlite':
+				oc_require_once('inc/User/database.php');
+				self::$_backend = new OC_USER_DATABASE();
+				break;
+			case 'ldap':
+				oc_require_once('inc/User/ldap.php');
+				self::$_backend = new OC_USER_LDAP();
+				break;
+			default:
+				oc_require_once('inc/User/database.php');
+				self::$_backend = new OC_USER_DATABASE();
+				break;
+		}
+	}
 
 	/**
-	 * Check if the login button is pressed and logg the user in
-	 *
-	 */
-	abstract public static function loginLisener();
+	* check if the login button is pressed and logg the user in
+	*
+	*/
+	public static function loginLisener() {
+		return self::$_backend->loginLisener();
+	}
 
 	/**
-	 * Try to create a new user
-	 *
-	 */
-	abstract public static function createUser($username, $password);
+	* try to create a new user
+	*
+	*/
+	public static function createUser($username, $password) {
+		return self::$_backend->createUser($username, $password);
+	}
 
 	/**
-	 * Try to login a user
-	 *
-	 */
-	abstract public static function login($username, $password);
+	* try to login a user
+	*
+	*/
+	public static function login($username, $password) {
+		return self::$_backend->login($username, $password);
+	}
 
 	/**
-	 * Check if the logout button is pressed and logout the user
-	 *
-	 */
-	abstract public static function logoutLisener();
+	* check if the logout button is pressed and logout the user
+	*
+	*/
+	public static function logoutLisener() {
+		return self::$_backend->logoutLisener();
+	}
 
 	/**
-	 * Check if a user is logged in
-	 *
-	 */
-	abstract public static function isLoggedIn();
+	* check if a user is logged in
+	*
+	*/
+	public static function isLoggedIn() {
+		return self::$_backend->isLoggedIn();
+	}
 
 	/**
-	 * Try to create a new group
-	 *
-	 */
-	abstract public static function createGroup($groupName);
+	* try to create a new group
+	*
+	*/
+	public static function createGroup($groupName) {
+		return self::$_backend->createGroup($groupName);
+	}
 
 	/**
-	 * Get the ID of a user
-	 *
-	 */
-	abstract public static function getUserId($username, $noCache=false);
+	* get the id of a user
+	*
+	*/
+	public static function getUserId($username, $noCache=false) {
+		return self::$_backend->getUserId($username, $noCache=false);
+	}
 
 	/**
-	 * Get the ID of a group
-	 *
-	 */
-	abstract public static function getGroupId($groupName, $noCache=false);
+	* get the id of a group
+	*
+	*/
+	public static function getGroupId($groupName, $noCache=false) {
+		return self::$_backend->getGroupId($groupName, $noCache=false);
+	}
 
 	/**
-	 * Get the name of a group
-	 *
-	 */
-	abstract public static function getGroupName($groupId, $noCache=false);
+	* get the name of a group
+	*
+	*/
+	public static function getGroupName($groupId, $noCache=false) {
+		return self::$_backend->getGroupName($groupId, $noCache=false);
+	}
 
 	/**
-	 * Check if a user belongs to a group
-	 *
-	 */
-	abstract public static function inGroup($username, $groupName);
+	* check if a user belongs to a group
+	*
+	*/
+	public static function inGroup($username, $groupName) {
+		return self::$_backend->inGroup($username, $groupName);
+	}
 
 	/**
-	 * Add a user to a group
-	 *
-	 */
-	abstract public static function addToGroup($username, $groupName);
+	* add a user to a group
+	*
+	*/
+	public static function addToGroup($username, $groupName) {
+		return self::$_backend->addToGroup($username, $groupName);
+	}
 
-	abstract public static function generatePassword();
+	public static function generatePassword() {
+		return uniqId();
+	}
 
 	/**
-	 * Get all groups the user belongs to
-	 *
-	 */
-	abstract public static function getUserGroups($username);
+	* get all groups the user belongs to
+	*
+	*/
+	public static function getUserGroups($username) {
+		return self::$_backend->getUserGroups($username);
+	}
 
 	/**
-	 * Set the password of a user
-	 *
-	 */
-	abstract public static function setPassword($username, $password);
+	* set the password of a user
+	*
+	*/
+	public static function setPassword($username, $password) {
+		return self::$_backend->setPassword($username, $password);
+	}
 
 	/**
-	 * Check the password of a user
-	 *
-	 */
-	abstract public static function checkPassword($username, $password);
+	* check the password of a user
+	*
+	*/
+	public static function checkPassword($username, $password) {
+		return self::$_backend->checkPassword($username, $password);
+	}
 
 }