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diff --git a/apps/user_ldap/lib/User_Proxy.php b/apps/user_ldap/lib/User_Proxy.php
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+++ b/apps/user_ldap/lib/User_Proxy.php
@@ -0,0 +1,276 @@
+<?php
+/**
+ * @author Arthur Schiwon <blizzz@owncloud.com>
+ * @author Christopher Schäpers <kondou@ts.unde.re>
+ * @author Lukas Reschke <lukas@owncloud.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\User_LDAP;
+
+use OCA\user_ldap\lib\ILDAPWrapper;
+use OCA\User_LDAP\lib\User\User;
+use \OCA\user_ldap\User_LDAP;
+use OCP\IConfig;
+
+class User_Proxy extends lib\Proxy implements \OCP\IUserBackend, \OCP\UserInterface {
+	private $backends = array();
+	private $refBackend = null;
+
+	/**
+	 * Constructor
+	 * @param array $serverConfigPrefixes array containing the config Prefixes
+	 */
+	public function __construct(array $serverConfigPrefixes, ILDAPWrapper $ldap, IConfig $ocConfig) {
+		parent::__construct($ldap);
+		foreach($serverConfigPrefixes as $configPrefix) {
+			$this->backends[$configPrefix] =
+				new User_LDAP($this->getAccess($configPrefix), $ocConfig);
+			if(is_null($this->refBackend)) {
+				$this->refBackend = &$this->backends[$configPrefix];
+			}
+		}
+	}
+
+	/**
+	 * Tries the backends one after the other until a positive result is returned from the specified method
+	 * @param string $uid the uid connected to the request
+	 * @param string $method the method of the user backend that shall be called
+	 * @param array $parameters an array of parameters to be passed
+	 * @return mixed the result of the method or false
+	 */
+	protected function walkBackends($uid, $method, $parameters) {
+		$cacheKey = $this->getUserCacheKey($uid);
+		foreach($this->backends as $configPrefix => $backend) {
+			$instance = $backend;
+			if(!method_exists($instance, $method)
+				&& method_exists($this->getAccess($configPrefix), $method)) {
+				$instance = $this->getAccess($configPrefix);
+			}
+			if($result = call_user_func_array(array($instance, $method), $parameters)) {
+				$this->writeToCache($cacheKey, $configPrefix);
+				return $result;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Asks the backend connected to the server that supposely takes care of the uid from the request.
+	 * @param string $uid the uid connected to the request
+	 * @param string $method the method of the user backend that shall be called
+	 * @param array $parameters an array of parameters to be passed
+	 * @param mixed $passOnWhen the result matches this variable
+	 * @return mixed the result of the method or false
+	 */
+	protected function callOnLastSeenOn($uid, $method, $parameters, $passOnWhen) {
+		$cacheKey = $this->getUserCacheKey($uid);
+		$prefix = $this->getFromCache($cacheKey);
+		//in case the uid has been found in the past, try this stored connection first
+		if(!is_null($prefix)) {
+			if(isset($this->backends[$prefix])) {
+				$instance = $this->backends[$prefix];
+				if(!method_exists($instance, $method)
+					&& method_exists($this->getAccess($prefix), $method)) {
+					$instance = $this->getAccess($prefix);
+				}
+				$result = call_user_func_array(array($instance, $method), $parameters);
+				if($result === $passOnWhen) {
+					//not found here, reset cache to null if user vanished
+					//because sometimes methods return false with a reason
+					$userExists = call_user_func_array(
+						array($this->backends[$prefix], 'userExists'),
+						array($uid)
+					);
+					if(!$userExists) {
+						$this->writeToCache($cacheKey, null);
+					}
+				}
+				return $result;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Check if backend implements actions
+	 * @param int $actions bitwise-or'ed actions
+	 * @return boolean
+	 *
+	 * Returns the supported actions as int to be
+	 * compared with OC_USER_BACKEND_CREATE_USER etc.
+	 */
+	public function implementsActions($actions) {
+		//it's the same across all our user backends obviously
+		return $this->refBackend->implementsActions($actions);
+	}
+
+	/**
+	 * Backend name to be shown in user management
+	 * @return string the name of the backend to be shown
+	 */
+	public function getBackendName() {
+		return $this->refBackend->getBackendName();
+	}
+
+	/**
+	 * Get a list of all users
+	 *
+	 * @param string $search
+	 * @param null|int $limit
+	 * @param null|int $offset
+	 * @return string[] an array of all uids
+	 */
+	public function getUsers($search = '', $limit = 10, $offset = 0) {
+		//we do it just as the /OC_User implementation: do not play around with limit and offset but ask all backends
+		$users = array();
+		foreach($this->backends as $backend) {
+			$backendUsers = $backend->getUsers($search, $limit, $offset);
+			if (is_array($backendUsers)) {
+				$users = array_merge($users, $backendUsers);
+			}
+		}
+		return $users;
+	}
+
+	/**
+	 * check if a user exists
+	 * @param string $uid the username
+	 * @return boolean
+	 */
+	public function userExists($uid) {
+		return $this->handleRequest($uid, 'userExists', array($uid));
+	}
+
+	/**
+	 * check if a user exists on LDAP
+	 * @param string|\OCA\User_LDAP\lib\User\User $user either the ownCloud user
+	 * name or an instance of that user
+	 * @return boolean
+	 */
+	public function userExistsOnLDAP($user) {
+		$id = ($user instanceof User) ? $user->getUsername() : $user;
+		return $this->handleRequest($id, 'userExistsOnLDAP', array($user));
+	}
+
+	/**
+	 * Check if the password is correct
+	 * @param string $uid The username
+	 * @param string $password The password
+	 * @return bool
+	 *
+	 * Check if the password is correct without logging in the user
+	 */
+	public function checkPassword($uid, $password) {
+		return $this->handleRequest($uid, 'checkPassword', array($uid, $password));
+	}
+
+	/**
+	 * returns the username for the given login name, if available
+	 *
+	 * @param string $loginName
+	 * @return string|false
+	 */
+	public function loginName2UserName($loginName) {
+		$id = 'LOGINNAME,' . $loginName;
+		return $this->handleRequest($id, 'loginName2UserName', array($loginName));
+	}
+
+	/**
+	 * get the user's home directory
+	 * @param string $uid the username
+	 * @return boolean
+	 */
+	public function getHome($uid) {
+		return $this->handleRequest($uid, 'getHome', array($uid));
+	}
+
+	/**
+	 * get display name of the user
+	 * @param string $uid user ID of the user
+	 * @return string display name
+	 */
+	public function getDisplayName($uid) {
+		return $this->handleRequest($uid, 'getDisplayName', array($uid));
+	}
+
+	/**
+	 * checks whether the user is allowed to change his avatar in ownCloud
+	 * @param string $uid the ownCloud user name
+	 * @return boolean either the user can or cannot
+	 */
+	public function canChangeAvatar($uid) {
+		return $this->handleRequest($uid, 'canChangeAvatar', array($uid), true);
+	}
+
+	/**
+	 * Get a list of all display names and user ids.
+	 * @param string $search
+	 * @param string|null $limit
+	 * @param string|null $offset
+	 * @return array an array of all displayNames (value) and the corresponding uids (key)
+	 */
+	public function getDisplayNames($search = '', $limit = null, $offset = null) {
+		//we do it just as the /OC_User implementation: do not play around with limit and offset but ask all backends
+		$users = array();
+		foreach($this->backends as $backend) {
+			$backendUsers = $backend->getDisplayNames($search, $limit, $offset);
+			if (is_array($backendUsers)) {
+				$users = $users + $backendUsers;
+			}
+		}
+		return $users;
+	}
+
+	/**
+	 * delete a user
+	 * @param string $uid The username of the user to delete
+	 * @return bool
+	 *
+	 * Deletes a user
+	 */
+	public function deleteUser($uid) {
+		return $this->handleRequest($uid, 'deleteUser', array($uid));
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function hasUserListings() {
+		return $this->refBackend->hasUserListings();
+	}
+
+	/**
+	 * Count the number of users
+	 * @return int|bool
+	 */
+	public function countUsers() {
+		$users = false;
+		foreach($this->backends as $backend) {
+			$backendUsers = $backend->countUsers();
+			if ($backendUsers !== false) {
+				$users += $backendUsers;
+			}
+		}
+		return $users;
+	}
+
+}