Fix merge conflicts

11 files changed, 1598 insertions, 310 deletions

diff --git a/lib/public/app.php b/lib/public/app.php
index 28411933beb..809a656f17f 100644
--- a/lib/public/app.php
+++ b/lib/public/app.php
@@ -26,7 +26,7 @@
  *
  */
 
-// use OCP namespace for all classes that are considered public. 
+// use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP;
 
@@ -34,105 +34,109 @@ namespace OCP;
  * This class provides functions to manage apps in ownCloud
  */
 class App {
-        /**
-         * @brief adds an entry to the navigation
-         * @param $data array containing the data
-         * @returns true/false
-         *
-         * This function adds a new entry to the navigation visible to users. $data
-         * is an associative array.
-         * The following keys are required:
-         *   - id: unique id for this entry ('addressbook_index')
-         *   - href: link to the page
-         *   - name: Human readable name ('Addressbook')
-         *
-         * The following keys are optional:
-         *   - icon: path to the icon of the app
-         *   - order: integer, that influences the position of your application in
-         *     the navigation. Lower values come first.
-         */
-        public static function addNavigationEntry( $data ){
-		return \OC_App::addNavigationEntry( $data );
+	/**
+	 * @brief Makes owncloud aware of this app
+	 * @brief This call is deprecated and not necessary to use.
+	 * @param $data array with all information
+	 * @returns true/false
+	 *
+	 * @deprecated this method is deprecated
+	 * Do not call it anymore
+	 * It'll remain in our public API for compatibility reasons
+	 *
+	 */
+	public static function register( $data ) {
+		return true; // don't do anything
 	}
 
+	/**
+	 * @brief adds an entry to the navigation
+	 * @param $data array containing the data
+	 * @returns true/false
+	 *
+	 * This function adds a new entry to the navigation visible to users. $data
+	 * is an associative array.
+	 * The following keys are required:
+	 *   - id: unique id for this entry ('addressbook_index')
+	 *   - href: link to the page
+	 *   - name: Human readable name ('Addressbook')
+	 *
+	 * The following keys are optional:
+	 *   - icon: path to the icon of the app
+	 *   - order: integer, that influences the position of your application in
+	 *	 the navigation. Lower values come first.
+	 */
+	public static function addNavigationEntry( $data ) {
+		return \OC_App::addNavigationEntry( $data );
+	}
 
-        /**
-         * @brief marks a navigation entry as active
-         * @param $id id of the entry
-         * @returns true/false
-         *
-         * This function sets a navigation entry as active and removes the 'active'
-         * property from all other entries. The templates can use this for
-         * highlighting the current position of the user.
-         */
-        public static function setActiveNavigationEntry( $id ){
+	/**
+	 * @brief marks a navigation entry as active
+	 * @param $id id of the entry
+	 * @returns true/false
+	 *
+	 * This function sets a navigation entry as active and removes the 'active'
+	 * property from all other entries. The templates can use this for
+	 * highlighting the current position of the user.
+	 */
+	public static function setActiveNavigationEntry( $id ) {
 		return \OC_App::setActiveNavigationEntry( $id );
 	}
 
-
-        /**
-         * @brief Register a Configuration Screen that should appear in the personal settings section.
-         * @param $app string appid
-         * @param $page string page to be included
-        */
-        public static function registerPersonal( $app, $page ){
+	/**
+	 * @brief Register a Configuration Screen that should appear in the personal settings section.
+	 * @param $app string appid
+	 * @param $page string page to be included
+	*/
+	public static function registerPersonal( $app, $page ) {
 		return \OC_App::registerPersonal( $app, $page );
 	}
 
-
 	/**
-         * @brief Register a Configuration Screen that should appear in the Admin section.
-         * @param $app string appid
-         * @param $page string page to be included
+	 * @brief Register a Configuration Screen that should appear in the Admin section.
+	 * @param $app string appid
+	 * @param $page string page to be included
 	 */
-	public static function registerAdmin( $app, $page ){
+	public static function registerAdmin( $app, $page ) {
 		return \OC_App::registerAdmin( $app, $page );
 	}
 
-
-        /**
-         * @brief Read app metadata from the info.xml file
-         * @param string $app id of the app or the path of the info.xml file
-         * @param boolean path (optional)
-         * @returns array
-        */
-        public static function getAppInfo( $app, $path=false ){
+	/**
+	 * @brief Read app metadata from the info.xml file
+	 * @param string $app id of the app or the path of the info.xml file
+	 * @param boolean path (optional)
+	 * @returns array
+	*/
+	public static function getAppInfo( $app, $path=false ) {
 		return \OC_App::getAppInfo( $app, $path);
 	}
 
-
-
-        /**
-         * @brief checks whether or not an app is enabled
-         * @param $app app
-         * @returns true/false
-         *
-         * This function checks whether or not an app is enabled.
-         */
-        public static function isEnabled( $app ){
+	/**
+	 * @brief checks whether or not an app is enabled
+	 * @param $app app
+	 * @returns true/false
+	 *
+	 * This function checks whether or not an app is enabled.
+	 */
+	public static function isEnabled( $app ) {
 		return \OC_App::isEnabled( $app );
 	}
 
+	/**
+	 * @brief Check if the app is enabled, redirects to home if not
+	 * @param $app app
+	 * @returns true/false
+	*/
+	public static function checkAppEnabled( $app ) {
+		return \OC_Util::checkAppEnabled( $app );
+	}
 
-        /**
-         * @brief Check if the app is enabled, redirects to home if not 
-         * @param $app app
-         * @returns true/false
-        */
-        public static function checkAppEnabled( $app ){
-                return \OC_Util::checkAppEnabled( $app );
-        }
-
-
-        /**
-         * @brief Get the last version of the app, either from appinfo/version or from appinfo/info.xml 
-         * @param $app app
-         * @returns true/false
-         */
-        public static function getAppVersion( $app ){
+	/**
+	 * @brief Get the last version of the app, either from appinfo/version or from appinfo/info.xml
+	 * @param $app app
+	 * @returns true/false
+	 */
+	public static function getAppVersion( $app ) {
 		return \OC_App::getAppVersion( $app );
 	}
-
-
-
 }
diff --git a/lib/public/backgroundjob.php b/lib/public/backgroundjob.php
new file mode 100644
index 00000000000..aba7d2b7620
--- /dev/null
+++ b/lib/public/backgroundjob.php
@@ -0,0 +1,117 @@
+<?php
+/**
+* ownCloud
+*
+* @author Jakob Sack
+* @copyright 2012 Jakob Sack owncloud@jakobsack.de
+*
+* 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 Affero General Public
+* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*
+*/
+
+/**
+ * Public interface of ownCloud forbackground jobs.
+ */
+
+// use OCP namespace for all classes that are considered public.
+// This means that they should be used by apps instead of the internal ownCloud classes
+namespace OCP;
+
+/**
+ * This class provides functions to manage backgroundjobs in ownCloud
+ *
+ * There are two kind of background jobs in ownCloud: regular tasks and
+ * queued tasks.
+ *
+ * Regular tasks have to be registered in appinfo.php and
+ * will run on a regular base. Fetching news could be a task that should run
+ * frequently.
+ *
+ * Queued tasks have to be registered each time you want to execute them.
+ * An example of the queued task would be the creation of the thumbnail. As
+ * soon as the user uploads a picture the gallery app registers the queued
+ * task "create thumbnail" and saves the path in the parameter instead of doing
+ * the work right away. This makes the app more responsive. As soon as the task
+ * is done it will be deleted from the list.
+ */
+class BackgroundJob {
+	/**
+	 * @brief creates a regular task
+	 * @param $klass class name
+	 * @param $method method name
+	 * @return true
+	 */
+	public static function addRegularTask( $klass, $method ) {
+		return \OC_BackgroundJob_RegularTask::register( $klass, $method );
+	}
+
+	/**
+	 * @brief gets all regular tasks
+	 * @return associative array
+	 *
+	 * key is string "$klass-$method", value is array( $klass, $method )
+	 */
+	static public function allRegularTasks() {
+		return \OC_BackgroundJob_RegularTask::all();
+	}
+
+	/**
+	 * @brief Gets one queued task
+	 * @param $id ID of the task
+	 * @return associative array
+	 */
+	public static function findQueuedTask( $id ) {
+		return \OC_BackgroundJob_QueuedTask::find( $id );
+	}
+
+	/**
+	 * @brief Gets all queued tasks
+	 * @return array with associative arrays
+	 */
+	public static function allQueuedTasks() {
+		return \OC_BackgroundJob_QueuedTask::all();
+	}
+
+	/**
+	 * @brief Gets all queued tasks of a specific app
+	 * @param $app app name
+	 * @return array with associative arrays
+	 */
+	public static function queuedTaskWhereAppIs( $app ) {
+		return \OC_BackgroundJob_QueuedTask::whereAppIs( $app );
+	}
+
+	/**
+	 * @brief queues a task
+	 * @param $app app name
+	 * @param $klass class name
+	 * @param $method method name
+	 * @param $parameters all useful data as text
+	 * @return id of task
+	 */
+	public static function addQueuedTask( $app, $klass, $method, $parameters ) {
+		return \OC_BackgroundJob_QueuedTask::add( $app, $klass, $method, $parameters );
+	}
+
+	/**
+	 * @brief deletes a queued task
+	 * @param $id id of task
+	 * @return true/false
+	 *
+	 * Deletes a report
+	 */
+	public static function deleteQueuedTask( $id ) {
+		return \OC_BackgroundJob_QueuedTask::delete( $id );
+	}
+}
diff --git a/lib/public/config.php b/lib/public/config.php
index ab01902ffe6..377150115ff 100644
--- a/lib/public/config.php
+++ b/lib/public/config.php
@@ -27,7 +27,7 @@
  */
 
 /**
- * @brief use OCP namespace for all classes that are considered public. 
+ * @brief use OCP namespace for all classes that are considered public.
  *
  * Classes that use this namespace are for use by apps, and not for use by internal
  * OC classes
@@ -38,8 +38,6 @@ namespace OCP;
  * This class provides functions to read and write configuration data. configuration can be on a system, application or user level
  */
 class Config {
-
-
 	/**
 	 * @brief Gets a value from config.php
 	 * @param $key key
@@ -49,11 +47,10 @@ class Config {
 	 * This function gets the value from config.php. If it does not exist,
 	 * $default will be returned.
 	 */
-	public static function getSystemValue( $key, $default = null ){
+	public static function getSystemValue( $key, $default = null ) {
 		return(\OC_Config::getValue( $key, $default ));
 	}
 
-
 	/**
 	 * @brief Sets a value
 	 * @param $key key
@@ -63,74 +60,64 @@ class Config {
 	 * This function sets the value and writes the config.php. If the file can
 	 * not be written, false will be returned.
 	 */
-	public static function setSystemValue( $key, $value ){
+	public static function setSystemValue( $key, $value ) {
 		return(\OC_Config::setValue( $key, $value ));
 	}
 
-
-        /**
-         * @brief Gets the config value
-         * @param $app app
-         * @param $key key
-         * @param $default = null, default value if the key does not exist
-         * @returns the value or $default
-         *
-         * This function gets a value from the appconfig table. If the key does
-         * not exist the default value will be returnes
-         */
-        public static function getAppValue( $app, $key, $default = null ){
+	/**
+	 * @brief Gets the config value
+	 * @param $app app
+	 * @param $key key
+	 * @param $default = null, default value if the key does not exist
+	 * @returns the value or $default
+	 *
+	 * This function gets a value from the appconfig table. If the key does
+	 * not exist the default value will be returnes
+	 */
+	public static function getAppValue( $app, $key, $default = null ) {
 		return(\OC_Appconfig::getValue( $app, $key, $default ));
 	}
 
-
-        /**
-         * @brief sets a value in the appconfig
-         * @param $app app
-         * @param $key key
-         * @param $value value
-         * @returns true/false
-         *
-         * Sets a value. If the key did not exist before it will be created.
-         */
-        public static function setAppValue( $app, $key, $value ){
+	/**
+	 * @brief sets a value in the appconfig
+	 * @param $app app
+	 * @param $key key
+	 * @param $value value
+	 * @returns true/false
+	 *
+	 * Sets a value. If the key did not exist before it will be created.
+	 */
+	public static function setAppValue( $app, $key, $value ) {
 		return(\OC_Appconfig::setValue( $app, $key, $value ));
 	}
 
-
-        /**
-         * @brief Gets the preference
-         * @param $user user
-         * @param $app app
-         * @param $key key
-         * @param $default = null, default value if the key does not exist
-         * @returns the value or $default
-         *
-         * This function gets a value from the prefernces table. If the key does
-         * not exist the default value will be returnes
-         */
-        public static function getUserValue( $user, $app, $key, $default = null ){
+	/**
+	 * @brief Gets the preference
+	 * @param $user user
+	 * @param $app app
+	 * @param $key key
+	 * @param $default = null, default value if the key does not exist
+	 * @returns the value or $default
+	 *
+	 * This function gets a value from the prefernces table. If the key does
+	 * not exist the default value will be returnes
+	 */
+	public static function getUserValue( $user, $app, $key, $default = null ) {
 		return(\OC_Preferences::getValue( $user, $app, $key, $default ));
 	}
 
-
-        /**
-         * @brief sets a value in the preferences
-         * @param $user user
-         * @param $app app
-         * @param $key key
-         * @param $value value
-         * @returns true/false
-         *
-         * Adds a value to the preferences. If the key did not exist before, it
-         * will be added automagically.
-         */
-        public static function setUserValue( $user, $app, $key, $value ){
+	/**
+	 * @brief sets a value in the preferences
+	 * @param $user user
+	 * @param $app app
+	 * @param $key key
+	 * @param $value value
+	 * @returns true/false
+	 *
+	 * Adds a value to the preferences. If the key did not exist before, it
+	 * will be added automagically.
+	 */
+	public static function setUserValue( $user, $app, $key, $value ) {
 		return(\OC_Preferences::setValue(  $user, $app, $key, $value ));
 	}
-
-
-
-
-
-
 }
diff --git a/lib/public/db.php b/lib/public/db.php
index 3a33f7674d8..6ce62b27ca2 100644
--- a/lib/public/db.php
+++ b/lib/public/db.php
@@ -26,7 +26,7 @@
  *
  */
 
-// use OCP namespace for all classes that are considered public. 
+// use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP;
 
@@ -34,8 +34,6 @@ namespace OCP;
  * This class provides access to the internal database system. Use this class exlusively if you want to access databases
  */
 class DB {
-
-
 	/**
 	 * @brief Prepare a SQL query
 	 * @param $query Query string
@@ -43,11 +41,10 @@ class DB {
 	 *
 	 * SQL query via MDB2 prepare(), needs to be execute()'d!
 	 */
-	static public function prepare( $query ){
-		return(\OC_DB::prepare($query));
+	static public function prepare( $query, $limit=null, $offset=null ) {
+		return(\OC_DB::prepare($query,$limit,$offset));
 	}
 
-
 	/**
 	 * @brief gets last value of autoincrement
 	 * @param $table string The optional table name (will replace *PREFIX*) and add sequence suffix
@@ -58,36 +55,30 @@ class DB {
 	 * Call this method right after the insert command or other functions may
 	 * cause trouble!
 	 */
-	public static function insertid($table=null){
+	public static function insertid($table=null) {
 		return(\OC_DB::insertid($table));
 	}
 
-
 	/**
 	 * @brief Start a transaction
 	 */
-	public static function beginTransaction(){
+	public static function beginTransaction() {
 		return(\OC_DB::beginTransaction());
 	}
 
-
 	/**
 	 * @brief Commit the database changes done during a transaction that is in progress
 	 */
-	public static function commit(){
+	public static function commit() {
 		return(\OC_DB::commit());
 	}
 
-
 	/**
 	 * @brief check if a result is an error, works with MDB2 and PDOException
 	 * @param mixed $result
 	 * @return bool
 	 */
-	public static function isError($result){
+	public static function isError($result) {
 		return(\OC_DB::isError($result));
 	}
-
-
-
 }
diff --git a/lib/public/files.php b/lib/public/files.php
index 32b3f036744..90889c59ad8 100644
--- a/lib/public/files.php
+++ b/lib/public/files.php
@@ -26,7 +26,7 @@
  *
  */
 
-// use OCP namespace for all classes that are considered public. 
+// use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP;
 
@@ -34,8 +34,6 @@ namespace OCP;
  * This class provides access to the internal filesystem abstraction layer. Use this class exlusively if you want to access files
  */
 class Files {
-
-
 	/**
 	 * @brief Recusive deletion of folders
 	 * @param string $dir path to the folder
@@ -45,29 +43,26 @@ class Files {
 		\OC_Helper::rmdirr( $dir );
 	}
 
-
 	/**
 	 * get the mimetype form a local file
 	 * @param string path
 	 * @return string
 	 * does NOT work for ownClouds filesystem, use OC_FileSystem::getMimeType instead
 	 */
-	static function getMimeType( $path ){
+	static function getMimeType( $path ) {
 		return(\OC_Helper::getMimeType( $path ));
 	}
 
-
 	/**
 	 * copy the contents of one stream to another
 	 * @param resource source
 	 * @param resource target
 	 * @return int the number of bytes copied
 	 */
-	public static function streamCopy( $source, $target ){
+	public static function streamCopy( $source, $target ) {
 		return(\OC_Helper::streamCopy( $source, $target ));
 	}
 
-
 	/**
 	 * create a temporary file with an unique filename
 	 * @param string postfix
@@ -75,22 +70,20 @@ class Files {
 	 *
 	 * temporary files are automatically cleaned up after the script is finished
 	 */
-	public static function tmpFile( $postfix='' ){
+	public static function tmpFile( $postfix='' ) {
 		return(\OC_Helper::tmpFile( $postfix ));
 	}
 
-
 	/**
 	 * create a temporary folder with an unique filename
 	 * @return string
 	 *
 	 * temporary files are automatically cleaned up after the script is finished
 	 */
-	public static function tmpFolder(){
+	public static function tmpFolder() {
 		return(\OC_Helper::tmpFolder());
 	}
 
-
 	/**
 	 * Adds a suffix to the name in case the file exists
 	 *
@@ -98,20 +91,16 @@ class Files {
 	 * @param $filename
 	 * @return string
 	 */
-	public static function buildNotExistingFileName( $path, $filename ){
+	public static function buildNotExistingFileName( $path, $filename ) {
 		return(\OC_Helper::buildNotExistingFileName( $path, $filename ));
 	}
 
-        /**
-         * @param string appid
-         * @param $app app
-         * @return OC_FilesystemView
-         */
-        public static function getStorage( $app ){
+	/**
+	 * @param string appid
+	 * @param $app app
+	 * @return OC_FilesystemView
+	 */
+	public static function getStorage( $app ) {
 		return \OC_App::getStorage( $app );
 	}
-
-
-
-
 }
diff --git a/lib/public/json.php b/lib/public/json.php
index 99df79173eb..2186dd8ee49 100644
--- a/lib/public/json.php
+++ b/lib/public/json.php
@@ -26,7 +26,7 @@
  *
  */
 
-// use OCP namespace for all classes that are considered public. 
+// use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP;
 
@@ -34,92 +34,91 @@ namespace OCP;
  * This class provides convinient functions to generate and send JSON data. Usefull for Ajax calls
  */
 class JSON {
-
 	/**
 	* @brief Encode and print $data in JSON format
 	* @param array $data The data to use
 	* @param string $setContentType the optional content type
 	* @return string json formatted string.
 	*/
-	public static function encodedPrint( $data, $setContentType=true ){
+	public static function encodedPrint( $data, $setContentType=true ) {
 		return(\OC_JSON::encodedPrint( $data, $setContentType ));
 	}
 
 	/**
 	* Check if the user is logged in, send json error msg if not.
-	* 
+	*
 	* This method checks if a user is logged in. If not, a json error
 	* response will be return and the method will exit from execution
 	* of the script.
 	* The returned json will be in the format:
-	* 
+	*
 	*     {"status":"error","data":{"message":"Authentication error."}}
-	* 
+	*
 	* Add this call to the start of all ajax method files that requires
 	* an authenticated user.
-	* 
+	*
 	* @return string json formatted error string if not authenticated.
 	*/
-	public static function checkLoggedIn(){
+	public static function checkLoggedIn() {
 		return(\OC_JSON::checkLoggedIn());
 	}
 
 	/**
 	* Check an ajax get/post call if the request token is valid.
-	* 
+	*
 	* This method checks for a valid variable 'requesttoken' in $_GET,
 	* $_POST and $_SERVER. If a valid token is not found, a json error
 	* response will be return and the method will exit from execution
 	* of the script.
 	* The returned json will be in the format:
-	* 
+	*
 	*     {"status":"error","data":{"message":"Token expired. Please reload page."}}
-	* 
-	* Add this call to the start of all ajax method files that creates, 
+	*
+	* Add this call to the start of all ajax method files that creates,
 	* updates or deletes anything.
 	* In cases where you e.g. use an ajax call to load a dialog containing
 	* a submittable form, you will need to add the requesttoken first as a
 	* parameter to the ajax call, then assign it to the template and finally
 	* add a hidden input field also named 'requesttoken' containing the value.
-	* 
+	*
 	* @return string json formatted error string if not valid.
 	*/
-	public static function callCheck(){
+	public static function callCheck() {
 		return(\OC_JSON::callCheck());
 	}
 
 	/**
 	* Send json success msg
-	* 
+	*
 	* Return a json success message with optional extra data.
-	* @see OCP\JSON::error() 		for the format to use.
-	* 
+	* @see OCP\JSON::error()		for the format to use.
+	*
 	* @param array $data The data to use
 	* @return string json formatted string.
 	*/
-	public static function success( $data = array() ){
+	public static function success( $data = array() ) {
 		return(\OC_JSON::success( $data ));
 	}
 
 	/**
 	* Send json error msg
-	* 
-	* Return a json error message with optional extra data for 
+	*
+	* Return a json error message with optional extra data for
 	* error message or app specific data.
-	* 
+	*
 	* Example use:
-	* 
+	*
 	*     $id = [some value]
 	*     OCP\JSON::error(array('data':array('message':'An error happened', 'id': $id)));
-	* 
+	*
 	* Will return the json formatted string:
-	* 
+	*
 	*     {"status":"error","data":{"message":"An error happened", "id":[some value]}}
-	* 
+	*
 	* @param array $data The data to use
 	* @return string json formatted error string.
 	*/
-	public static function error( $data = array() ){
+	public static function error( $data = array() ) {
 		return(\OC_JSON::error( $data ));
 	}
 
@@ -128,47 +127,46 @@ class JSON {
 	* @param array $type The contwnt type header
 	* @return string json formatted string.
 	*/
-	public static function setContentTypeHeader( $type='application/json' ){
+	public static function setContentTypeHeader( $type='application/json' ) {
 		return(\OC_JSON::setContentTypeHeader( $type ));
 	}
 
 	/**
 	* Check if the App is enabled and send JSON error message instead
-	* 
+	*
 	* This method checks if a specific app is enabled. If not, a json error
 	* response will be return and the method will exit from execution
 	* of the script.
 	* The returned json will be in the format:
-	* 
+	*
 	*     {"status":"error","data":{"message":"Application is not enabled."}}
-	* 
+	*
 	* Add this call to the start of all ajax method files that requires
 	* a specific app to be enabled.
-	* 
+	*
 	* @param string $app The app to check
 	* @return string json formatted string if not enabled.
 	*/
-	public static function checkAppEnabled( $app ){
+	public static function checkAppEnabled( $app ) {
 		return(\OC_JSON::checkAppEnabled( $app ));
 	}
 
 	/**
 	* Check if the user is a admin, send json error msg if not
-	* 
+	*
 	* This method checks if the current user has admin rights. If not, a json error
 	* response will be return and the method will exit from execution
 	* of the script.
 	* The returned json will be in the format:
-	* 
+	*
 	*     {"status":"error","data":{"message":"Authentication error."}}
-	* 
+	*
 	* Add this call to the start of all ajax method files that requires
 	* administrative rights.
-	* 
+	*
 	* @return string json formatted string if not admin user.
 	*/
-	public static function checkAdminUser(){
+	public static function checkAdminUser() {
 		return(\OC_JSON::checkAdminUser());
 	}
-
 }
diff --git a/lib/public/response.php b/lib/public/response.php
index 8dff3bcd354..95e67a85720 100644
--- a/lib/public/response.php
+++ b/lib/public/response.php
@@ -26,7 +26,7 @@
  *
  */
 
-// use OCP namespace for all classes that are considered public. 
+// use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP;
 
@@ -34,8 +34,6 @@ namespace OCP;
  * This class provides convinient functions to send the correct http response headers
  */
 class Response {
-
-
 	/**
 	* @brief Enable response caching by sending correct HTTP headers
 	* @param $cache_time time to cache the response
@@ -47,7 +45,6 @@ class Response {
 		return(\OC_Response::enableCaching( $cache_time ));
 	}
 
-
 	/**
 	* Checks and set Last-Modified header, when the request matches sends a
 	* 'not modified' response
@@ -57,7 +54,6 @@ class Response {
 		return(\OC_Response::setLastModifiedHeader( $lastModified ));
 	}
 
-
 	/**
 	* @brief disable browser caching
 	* @see enableCaching with cache_time = 0
@@ -66,7 +62,6 @@ class Response {
 		return(\OC_Response::disableCaching());
 	}
 
-
 	/**
 	* Checks and set ETag header, when the request matches sends a
 	* 'not modified' response
@@ -76,7 +71,6 @@ class Response {
 		return(\OC_Response::setETagHeader( $etag ));
 	}
 
-
 	/**
 	* @brief Send file as response, checking and setting caching headers
 	* @param $filepath of file to send
@@ -102,6 +96,4 @@ class Response {
 	static public function redirect( $location ) {
 		return(\OC_Response::redirect( $location ));
 	}
-
-
-}
+}
\ No newline at end of file
diff --git a/lib/public/share.php b/lib/public/share.php
new file mode 100644
index 00000000000..b215d7f9389
--- /dev/null
+++ b/lib/public/share.php
@@ -0,0 +1,1224 @@
+<?php
+/**
+* ownCloud
+*
+* @author Michael Gapczynski
+* @copyright 2012 Michael Gapczynski mtgap@owncloud.com
+*
+* 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 Affero General Public
+* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*/
+namespace OCP;
+
+\OC_Hook::connect('OC_User', 'post_deleteUser', 'OCP\Share', 'post_deleteUser');
+\OC_Hook::connect('OC_User', 'post_addToGroup', 'OCP\Share', 'post_addToGroup');
+\OC_Hook::connect('OC_User', 'post_removeFromGroup', 'OCP\Share', 'post_removeFromGroup');
+\OC_Hook::connect('OC_User', 'post_deleteGroup', 'OCP\Share', 'post_deleteGroup');
+
+/**
+* This class provides the ability for apps to share their content between users.
+* Apps must create a backend class that implements OCP\Share_Backend and register it with this class.
+*/
+class Share {
+
+	const SHARE_TYPE_USER = 0;
+	const SHARE_TYPE_GROUP = 1;
+	const SHARE_TYPE_LINK = 3;
+	const SHARE_TYPE_EMAIL = 4;
+	const SHARE_TYPE_CONTACT = 5;
+	const SHARE_TYPE_REMOTE = 6;
+
+	/** CRUDS permissions (Create, Read, Update, Delete, Share) using a bitmask
+	* Construct permissions for share() and setPermissions with Or (|) e.g. Give user read and update permissions: PERMISSION_READ | PERMISSION_UPDATE
+	* Check if permission is granted with And (&) e.g. Check if delete is granted: if ($permissions & PERMISSION_DELETE)
+	* Remove permissions with And (&) and Not (~) e.g. Remove the update permission: $permissions &= ~PERMISSION_UPDATE
+	* Apps are required to handle permissions on their own, this class only stores and manages the permissions of shares
+	*/
+	const PERMISSION_CREATE = 4;
+	const PERMISSION_READ = 1;
+	const PERMISSION_UPDATE = 2;
+	const PERMISSION_DELETE = 8;
+	const PERMISSION_SHARE = 16;
+
+	const FORMAT_NONE = -1;
+	const FORMAT_STATUSES = -2;
+	const FORMAT_SOURCES = -3;
+
+	private static $shareTypeUserAndGroups = -1;
+	private static $shareTypeGroupUserUnique = 2;
+	private static $backends = array();
+	private static $backendTypes = array();
+
+	/**
+	* @brief Register a sharing backend class that implements OCP\Share_Backend for an item type
+	* @param string Item type
+	* @param string Backend class
+	* @param string (optional) Depends on item type
+	* @param array (optional) List of supported file extensions if this item type depends on files
+	* @return Returns true if backend is registered or false if error
+	*/
+	public static function registerBackend($itemType, $class, $collectionOf = null, $supportedFileExtensions = null) {
+		if (self::isEnabled()) {
+			if (!isset(self::$backendTypes[$itemType])) {
+				self::$backendTypes[$itemType] = array('class' => $class, 'collectionOf' => $collectionOf, 'supportedFileExtensions' => $supportedFileExtensions);
+				if(count(self::$backendTypes) === 1) {
+					\OC_Util::addScript('core', 'share');
+					\OC_Util::addStyle('core', 'share');
+				}
+				return true;
+			}
+			\OC_Log::write('OCP\Share', 'Sharing backend '.$class.' not registered, '.self::$backendTypes[$itemType]['class'].' is already registered for '.$itemType, \OC_Log::WARN);
+		}
+		return false;
+	}
+
+	/**
+	* @brief Check if the Share API is enabled
+	* @return Returns true if enabled or false
+	*
+	* The Share API is enabled by default if not configured
+	*
+	*/
+	public static function isEnabled() {
+		if (\OC_Appconfig::getValue('core', 'shareapi_enabled', 'yes') == 'yes') {
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	* @brief Get the items of item type shared with the current user
+	* @param string Item type
+	* @param int Format (optional) Format type must be defined by the backend
+	* @param int Number of items to return (optional) Returns all by default
+	* @return Return depends on format
+	*/
+	public static function getItemsSharedWith($itemType, $format = self::FORMAT_NONE, $parameters = null, $limit = -1, $includeCollections = false) {
+		return self::getItems($itemType, null, self::$shareTypeUserAndGroups, \OC_User::getUser(), null, $format, $parameters, $limit, $includeCollections);
+	}
+
+	/**
+	* @brief Get the item of item type shared with the current user
+	* @param string Item type
+	* @param string Item target
+	* @param int Format (optional) Format type must be defined by the backend
+	* @return Return depends on format
+	*/
+	public static function getItemSharedWith($itemType, $itemTarget, $format = self::FORMAT_NONE, $parameters = null, $includeCollections = false) {
+		return self::getItems($itemType, $itemTarget, self::$shareTypeUserAndGroups, \OC_User::getUser(), null, $format, $parameters, 1, $includeCollections);
+	}
+
+	/**
+	* @brief Get the item of item type shared with the current user by source
+	* @param string Item type
+	* @param string Item source
+	* @param int Format (optional) Format type must be defined by the backend
+	* @return Return depends on format
+	*/
+	public static function getItemSharedWithBySource($itemType, $itemSource, $format = self::FORMAT_NONE, $parameters = null, $includeCollections = false) {
+		return self::getItems($itemType, $itemSource, self::$shareTypeUserAndGroups, \OC_User::getUser(), null, $format, $parameters, 1, $includeCollections, true);
+	}
+
+	/**
+	* @brief Get the item of item type shared by a link
+	* @param string Item type
+	* @param string Item source
+	* @param string Owner of link
+	* @return Item
+	*/
+	public static function getItemSharedWithByLink($itemType, $itemSource, $uidOwner) {
+		return self::getItems($itemType, $itemSource, self::SHARE_TYPE_LINK, null, $uidOwner, self::FORMAT_NONE, null, 1);
+	}
+
+	/**
+	* @brief Get the shared items of item type owned by the current user
+	* @param string Item type
+	* @param int Format (optional) Format type must be defined by the backend
+	* @param int Number of items to return (optional) Returns all by default
+	* @return Return depends on format
+	*/
+	public static function getItemsShared($itemType, $format = self::FORMAT_NONE, $parameters = null, $limit = -1, $includeCollections = false) {
+		return self::getItems($itemType, null, null, null, \OC_User::getUser(), $format, $parameters, $limit, $includeCollections);
+	}
+
+	/**
+	* @brief Get the shared item of item type owned by the current user
+	* @param string Item type
+	* @param string Item source
+	* @param int Format (optional) Format type must be defined by the backend
+	* @return Return depends on format
+	*/
+	public static function getItemShared($itemType, $itemSource, $format = self::FORMAT_NONE, $parameters = null, $includeCollections = false) {
+		return self::getItems($itemType, $itemSource, null, null, \OC_User::getUser(), $format, $parameters, -1, $includeCollections);
+	}
+
+	/**
+	* @brief Share an item with a user, group, or via private link
+	* @param string Item type
+	* @param string Item source
+	* @param int SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
+	* @param string User or group the item is being shared with
+	* @param int CRUDS permissions
+	* @return bool Returns true on success or false on failure
+	*/
+	public static function shareItem($itemType, $itemSource, $shareType, $shareWith, $permissions) {
+		$uidOwner = \OC_User::getUser();
+		// Verify share type and sharing conditions are met
+		if ($shareType === self::SHARE_TYPE_USER) {
+			if ($shareWith == $uidOwner) {
+				$message = 'Sharing '.$itemSource.' failed, because the user '.$shareWith.' is the item owner';
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+			if (!\OC_User::userExists($shareWith)) {
+				$message = 'Sharing '.$itemSource.' failed, because the user '.$shareWith.' does not exist';
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+			if (\OC_Appconfig::getValue('core', 'shareapi_share_policy', 'global') == 'groups_only') {
+				$inGroup = array_intersect(\OC_Group::getUserGroups($uidOwner), \OC_Group::getUserGroups($shareWith));
+				if (empty($inGroup)) {
+					$message = 'Sharing '.$itemSource.' failed, because the user '.$shareWith.' is not a member of any groups that '.$uidOwner.' is a member of';
+					\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+					throw new \Exception($message);
+				}
+			}
+			// Check if the item source is already shared with the user, either from the same owner or a different user
+			if ($checkExists = self::getItems($itemType, $itemSource, self::$shareTypeUserAndGroups, $shareWith, null, self::FORMAT_NONE, null, 1, true, true)) {
+				// Only allow the same share to occur again if it is the same owner and is not a user share, this use case is for increasing permissions for a specific user
+				if ($checkExists['uid_owner'] != $uidOwner || $checkExists['share_type'] == $shareType) {
+					$message = 'Sharing '.$itemSource.' failed, because this item is already shared with '.$shareWith;
+					\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+					throw new \Exception($message);
+				}
+			}
+		} else if ($shareType === self::SHARE_TYPE_GROUP) {
+			if (!\OC_Group::groupExists($shareWith)) {
+				$message = 'Sharing '.$itemSource.' failed, because the group '.$shareWith.' does not exist';
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+			if (!\OC_Group::inGroup($uidOwner, $shareWith)) {
+				$message = 'Sharing '.$itemSource.' failed, because '.$uidOwner.' is not a member of the group '.$shareWith;
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+			// Check if the item source is already shared with the group, either from the same owner or a different user
+			// The check for each user in the group is done inside the put() function
+			if ($checkExists = self::getItems($itemType, $itemSource, self::SHARE_TYPE_GROUP, $shareWith, null, self::FORMAT_NONE, null, 1, true, true)) {
+				// Only allow the same share to occur again if it is the same owner and is not a group share, this use case is for increasing permissions for a specific user
+				if ($checkExists['uid_owner'] != $uidOwner || $checkExists['share_type'] == $shareType) {
+					$message = 'Sharing '.$itemSource.' failed, because this item is already shared with '.$shareWith;
+					\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+					throw new \Exception($message);
+				}
+			}
+			// Convert share with into an array with the keys group and users
+			$group = $shareWith;
+			$shareWith = array();
+			$shareWith['group'] = $group;
+			$shareWith['users'] = array_diff(\OC_Group::usersInGroup($group), array($uidOwner));
+		} else if ($shareType === self::SHARE_TYPE_LINK) {
+			if (\OC_Appconfig::getValue('core', 'shareapi_allow_links', 'yes') == 'yes') {
+				if ($checkExists = self::getItems($itemType, $itemSource, self::SHARE_TYPE_LINK, null, $uidOwner, self::FORMAT_NONE, null, 1)) {
+					// If password is set delete the old link
+					if (isset($shareWith)) {
+						self::delete($checkExists['id']);
+					} else {
+						$message = 'Sharing '.$itemSource.' failed, because this item is already shared with a link';
+						\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+						throw new \Exception($message);
+					}
+				}
+				// Generate hash of password - same method as user passwords
+				if (isset($shareWith)) {
+					$forcePortable = (CRYPT_BLOWFISH != 1);
+					$hasher = new \PasswordHash(8, $forcePortable);
+					$shareWith = $hasher->HashPassword($shareWith.\OC_Config::getValue('passwordsalt', ''));
+				}
+				return self::put($itemType, $itemSource, $shareType, $shareWith, $uidOwner, $permissions);
+			}
+			$message = 'Sharing '.$itemSource.' failed, because sharing with links is not allowed';
+			\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+			throw new \Exception($message);
+			return false;
+// 		} else if ($shareType === self::SHARE_TYPE_CONTACT) {
+// 			if (!\OC_App::isEnabled('contacts')) {
+// 				$message = 'Sharing '.$itemSource.' failed, because the contacts app is not enabled';
+// 				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+// 				return false;
+// 			}
+// 			$vcard = \OC_Contacts_App::getContactVCard($shareWith);
+// 			if (!isset($vcard)) {
+// 				$message = 'Sharing '.$itemSource.' failed, because the contact does not exist';
+// 				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+// 				throw new \Exception($message);
+// 			}
+// 			$details = \OC_Contacts_VCard::structureContact($vcard);
+// 			// TODO Add ownCloud user to contacts vcard
+// 			if (!isset($details['EMAIL'])) {
+// 				$message = 'Sharing '.$itemSource.' failed, because no email address is associated with the contact';
+// 				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+// 				throw new \Exception($message);
+// 			}
+// 			return self::shareItem($itemType, $itemSource, self::SHARE_TYPE_EMAIL, $details['EMAIL'], $permissions);
+		} else {
+			// Future share types need to include their own conditions
+			$message = 'Share type '.$shareType.' is not valid for '.$itemSource;
+			\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+			throw new \Exception($message);
+		}
+		// If the item is a folder, scan through the folder looking for equivalent item types
+		if ($itemType == 'folder') {
+			$parentFolder = self::put('folder', $itemSource, $shareType, $shareWith, $uidOwner, $permissions, true);
+			if ($parentFolder && $files = \OC_Files::getDirectoryContent($itemSource)) {
+				for ($i = 0; $i < count($files); $i++) {
+					$name = substr($files[$i]['name'], strpos($files[$i]['name'], $itemSource) - strlen($itemSource));
+					if ($files[$i]['mimetype'] == 'httpd/unix-directory' && $children = \OC_Files::getDirectoryContent($name, '/')) {
+						// Continue scanning into child folders
+						array_push($files, $children);
+					} else {
+						// Check file extension for an equivalent item type to convert to
+						$extension = strtolower(substr($itemSource, strrpos($itemSource, '.') + 1));
+						foreach (self::$backends as $type => $backend) {
+							if (isset($backend->dependsOn) && $backend->dependsOn == 'file' && isset($backend->supportedFileExtensions) && in_array($extension, $backend->supportedFileExtensions)) {
+								$itemType = $type;
+								break;
+							}
+						}
+						// Pass on to put() to check if this item should be converted, the item won't be inserted into the database unless it can be converted
+						self::put($itemType, $name, $shareType, $shareWith, $uidOwner, $permissions, $parentFolder);
+					}
+				}
+				return true;
+			}
+			return false;
+		} else {
+			// Put the item into the database
+			return self::put($itemType, $itemSource, $shareType, $shareWith, $uidOwner, $permissions);
+		}
+	}
+
+	/**
+	* @brief Unshare an item from a user, group, or delete a private link
+	* @param string Item type
+	* @param string Item source
+	* @param int SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
+	* @param string User or group the item is being shared with
+	* @return Returns true on success or false on failure
+	*/
+	public static function unshare($itemType, $itemSource, $shareType, $shareWith) {
+		if ($item = self::getItems($itemType, $itemSource, $shareType, $shareWith, \OC_User::getUser(), self::FORMAT_NONE, null, 1)) {
+			self::delete($item['id']);
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	* @brief Unshare an item shared with the current user
+	* @param string Item type
+	* @param string Item target
+	* @return Returns true on success or false on failure
+	*
+	* Unsharing from self is not allowed for items inside collections
+	*
+	*/
+	public static function unshareFromSelf($itemType, $itemTarget) {
+		if ($item = self::getItemSharedWith($itemType, $itemTarget)) {
+			if ((int)$item['share_type'] === self::SHARE_TYPE_GROUP) {
+				// Insert an extra row for the group share and set permission to 0 to prevent it from showing up for the user
+				$query = \OC_DB::prepare('INSERT INTO `*PREFIX*share` (`item_type`, `item_source`, `item_target`, `parent`, `share_type`, `share_with`, `uid_owner`, `permissions`, `stime`, `file_source`, `file_target`) VALUES (?,?,?,?,?,?,?,?,?,?,?)');
+				$query->execute(array($item['item_type'], $item['item_source'], $item['item_target'], $item['id'], self::$shareTypeGroupUserUnique, \OC_User::getUser(), $item['uid_owner'], 0, $item['stime'], $item['file_source'], $item['file_target']));
+				\OC_DB::insertid('*PREFIX*share');
+				// Delete all reshares by this user of the group share
+				self::delete($item['id'], true, \OC_User::getUser());
+			} else if ((int)$item['share_type'] === self::$shareTypeGroupUserUnique) {
+				// Set permission to 0 to prevent it from showing up for the user
+				$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `permissions` = ? WHERE `id` = ?');
+				$query->execute(array(0, $item['id']));
+				self::delete($item['id'], true);
+			} else {
+				self::delete($item['id']);
+			}
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	* @brief Set the permissions of an item for a specific user or group
+	* @param string Item type
+	* @param string Item source
+	* @param int SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
+	* @param string User or group the item is being shared with
+	* @param int CRUDS permissions
+	* @return Returns true on success or false on failure
+	*/
+	public static function setPermissions($itemType, $itemSource, $shareType, $shareWith, $permissions) {
+		if ($item = self::getItems($itemType, $itemSource, $shareType, $shareWith, \OC_User::getUser(), self::FORMAT_NONE, null, 1, false)) {
+			// Check if this item is a reshare and verify that the permissions granted don't exceed the parent shared item
+			if (isset($item['parent'])) {
+				$query = \OC_DB::prepare('SELECT `permissions` FROM `*PREFIX*share` WHERE `id` = ?', 1);
+				$result = $query->execute(array($item['parent']))->fetchRow();
+				if (~(int)$result['permissions'] & $permissions) {
+					$message = 'Setting permissions for '.$itemSource.' failed, because the permissions exceed permissions granted to '.\OC_User::getUser();
+					\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+					throw new \Exception($message);
+				}
+			}
+			$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `permissions` = ? WHERE `id` = ?');
+			$query->execute(array($permissions, $item['id']));
+			// Check if permissions were removed
+			if ($item['permissions'] & ~$permissions) {
+				// If share permission is removed all reshares must be deleted
+				if (($item['permissions'] & self::PERMISSION_SHARE) && (~$permissions & self::PERMISSION_SHARE)) {
+					self::delete($item['id'], true);
+				} else {
+					$ids = array();
+					$parents = array($item['id']);
+					while (!empty($parents)) {
+						$parents = "'".implode("','", $parents)."'";
+						$query = \OC_DB::prepare('SELECT `id`, `permissions` FROM `*PREFIX*share` WHERE `parent` IN ('.$parents.')');
+						$result = $query->execute();
+						// Reset parents array, only go through loop again if items are found that need permissions removed
+						$parents = array();
+						while ($item = $result->fetchRow()) {
+							// Check if permissions need to be removed
+							if ($item['permissions'] & ~$permissions) {
+								// Add to list of items that need permissions removed
+								$ids[] = $item['id'];
+								$parents[] = $item['id'];
+							}
+						}
+					}
+					// Remove the permissions for all reshares of this item
+					if (!empty($ids)) {
+						$ids = "'".implode("','", $ids)."'";
+						$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `permissions` = `permissions` & ? WHERE `id` IN ('.$ids.')');
+						$query->execute(array($permissions));
+					}
+				}
+			}
+			return true;
+		}
+		$message = 'Setting permissions for '.$itemSource.' failed, because the item was not found';
+		\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+		throw new \Exception($message);
+	}
+
+	public static function setExpirationDate($itemType, $itemSource, $date) {
+		if ($item = self::getItems($itemType, $itemSource, null, null, \OC_User::getUser(), self::FORMAT_NONE, null, 1, false)) {
+			error_log('setting');
+			$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `expiration` = ? WHERE `id` = ?');
+			$query->execute(array($date, $item['id']));
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	* @brief Get the backend class for the specified item type
+	* @param string Item type
+	* @return Sharing backend object
+	*/
+	private static function getBackend($itemType) {
+		if (isset(self::$backends[$itemType])) {
+			return self::$backends[$itemType];
+		} else if (isset(self::$backendTypes[$itemType]['class'])) {
+			$class = self::$backendTypes[$itemType]['class'];
+			if (class_exists($class)) {
+				self::$backends[$itemType] = new $class;
+				if (!(self::$backends[$itemType] instanceof Share_Backend)) {
+					$message = 'Sharing backend '.$class.' must implement the interface OCP\Share_Backend';
+					\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+					throw new \Exception($message);
+				}
+				return self::$backends[$itemType];
+			} else {
+				$message = 'Sharing backend '.$class.' not found';
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+		}
+		$message = 'Sharing backend for '.$itemType.' not found';
+		\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+		throw new \Exception($message);
+	}
+
+	/**
+	* @brief Get a list of collection item types for the specified item type
+	* @param string Item type
+	* @return array
+	*/
+	private static function getCollectionItemTypes($itemType) {
+		$collectionTypes = array($itemType);
+		foreach (self::$backendTypes as $type => $backend) {
+			if (in_array($backend['collectionOf'], $collectionTypes)) {
+				$collectionTypes[] = $type;
+			}
+		}
+		if (!self::getBackend($itemType) instanceof Share_Backend_Collection) {
+			unset($collectionTypes[0]);
+		}
+		// Return array if collections were found or the item type is a collection itself - collections can be inside collections
+		if (count($collectionTypes) > 0) {
+			return $collectionTypes;
+		}
+		return false;
+	}
+
+	/**
+	* @brief Get shared items from the database
+	* @param string Item type
+	* @param string Item source or target (optional)
+	* @param int SHARE_TYPE_USER, SHARE_TYPE_GROUP, SHARE_TYPE_LINK, $shareTypeUserAndGroups, or $shareTypeGroupUserUnique
+	* @param string User or group the item is being shared with
+	* @param string User that is the owner of shared items (optional)
+	* @param int Format to convert items to with formatItems()
+	* @param mixed Parameters to pass to formatItems()
+	* @param int Number of items to return, -1 to return all matches (optional)
+	* @param bool Include collection item types (optional)
+	* @return mixed
+	*
+	* See public functions getItem(s)... for parameter usage
+	*
+	*/
+	private static function getItems($itemType, $item = null, $shareType = null, $shareWith = null, $uidOwner = null, $format = self::FORMAT_NONE, $parameters = null, $limit = -1, $includeCollections = false, $itemShareWithBySource = false) {
+		if (!self::isEnabled()) {
+			if ($limit == 1 || (isset($uidOwner) && isset($item))) {
+				return false;
+			} else {
+				return array();
+			}
+		}
+		$backend = self::getBackend($itemType);
+		// Get filesystem root to add it to the file target and remove from the file source, match file_source with the file cache
+		if ($itemType == 'file' || $itemType == 'folder') {
+			$root = \OC_Filesystem::getRoot();
+			$where = 'INNER JOIN `*PREFIX*fscache` ON `file_source` = `*PREFIX*fscache`.`id`';
+			if (!isset($item)) {
+				$where .= ' WHERE `file_target` IS NOT NULL';
+			}
+			$fileDependent = true;
+			$queryArgs = array();
+		} else {
+			$fileDependent = false;
+			$root = '';
+			if ($includeCollections && !isset($item) && ($collectionTypes = self::getCollectionItemTypes($itemType))) {
+				// If includeCollections is true, find collections of this item type, e.g. a music album contains songs
+				if (!in_array($itemType, $collectionTypes)) {
+					$itemTypes = array_merge(array($itemType), $collectionTypes);
+				} else {
+					$itemTypes = $collectionTypes;
+				}
+				$placeholders = join(',', array_fill(0, count($itemTypes), '?'));
+				$where .= ' WHERE item_type IN ('.$placeholders.'))';
+				$queryArgs = $itemTypes;
+			} else {
+				$where = ' WHERE `item_type` = ?';
+				$queryArgs = array($itemType);
+			}
+		}
+		if (isset($shareType)) {
+			// Include all user and group items
+			if ($shareType == self::$shareTypeUserAndGroups && isset($shareWith)) {
+				$where .= ' AND `share_type` IN (?,?,?)';
+				$queryArgs[] = self::SHARE_TYPE_USER;
+				$queryArgs[] = self::SHARE_TYPE_GROUP;
+				$queryArgs[] = self::$shareTypeGroupUserUnique;
+				$userAndGroups = array_merge(array($shareWith), \OC_Group::getUserGroups($shareWith));
+				$placeholders = join(',', array_fill(0, count($userAndGroups), '?'));
+				$where .= ' AND `share_with` IN ('.$placeholders.')';
+				$queryArgs = array_merge($queryArgs, $userAndGroups);
+				// Don't include own group shares
+				$where .= ' AND `uid_owner` != ?';
+				$queryArgs[] = $shareWith;
+			} else {
+				$where .= ' AND `share_type` = ?';
+				$queryArgs[] = $shareType;
+				if (isset($shareWith)) {
+					$where .= ' AND `share_with` = ?';
+					$queryArgs[] = $shareWith;
+				}
+			}
+		}
+		if (isset($uidOwner)) {
+			$where .= ' AND `uid_owner` = ?';
+			$queryArgs[] = $uidOwner;
+			if (!isset($shareType)) {
+				// Prevent unique user targets for group shares from being selected
+				$where .= ' AND `share_type` != ?';
+				$queryArgs[] = self::$shareTypeGroupUserUnique;
+			}
+			if ($itemType == 'file' || $itemType == 'folder') {
+				$column = 'file_source';
+			} else {
+				$column = 'item_source';
+			}
+		} else {
+			if ($itemType == 'file' || $itemType == 'folder') {
+				$column = 'file_target';
+			} else {
+				$column = 'item_target';
+			}
+		}
+		if (isset($item)) {
+			if ($includeCollections && $collectionTypes = self::getCollectionItemTypes($itemType)) {
+				$where .= ' AND (';
+			} else {
+				$where .= ' AND';
+			}
+			// If looking for own shared items, check item_source else check item_target
+			if (isset($uidOwner) || $itemShareWithBySource) {
+				// If item type is a file, file source needs to be checked in case the item was converted
+				if ($itemType == 'file' || $itemType == 'folder') {
+					$where .= ' `file_source` = ?';
+					$column = 'file_source';
+				} else {
+					$where .= ' `item_source` = ?';
+					$column = 'item_source';
+				}
+			} else {
+				if ($itemType == 'file' || $itemType == 'folder') {
+					$where .= ' `file_target` = ?';
+					$item = \OC_Filesystem::normalizePath($item);
+				} else {
+					$where .= ' `item_target` = ?';
+				}
+			}
+			$queryArgs[] = $item;
+			if ($includeCollections && $collectionTypes) {
+				$placeholders = join(',', array_fill(0, count($collectionTypes), '?'));
+				$where .= ' OR item_type IN ('.$placeholders.'))';
+				$queryArgs = array_merge($queryArgs, $collectionTypes);
+			}
+		}
+		if ($limit != -1 && !$includeCollections) {
+			if ($shareType == self::$shareTypeUserAndGroups) {
+				// Make sure the unique user target is returned if it exists, unique targets should follow the group share in the database
+				// If the limit is not 1, the filtering can be done later
+				$where .= ' ORDER BY `*PREFIX*share`.`id` DESC';
+			}
+			// The limit must be at least 3, because filtering needs to be done
+			if ($limit < 3) {
+				$queryLimit = 3;
+			} else {
+				$queryLimit = $limit;
+			}
+		} else {
+			$queryLimit = null;
+		}
+		// TODO Optimize selects
+		if ($format == self::FORMAT_STATUSES) {
+			if ($itemType == 'file' || $itemType == 'folder') {
+				$select = '`*PREFIX*share`.`id`, `item_type`, `*PREFIX*share`.`parent`, `share_type`, `file_source`, `path`, `expiration`';
+			} else {
+				$select = '`id`, `item_type`, `item_source`, `parent`, `share_type`, `expiration`';
+			}
+		} else {
+			if (isset($uidOwner)) {
+				if ($itemType == 'file' || $itemType == 'folder') {
+					$select = '`*PREFIX*share`.`id`, `item_type`, `*PREFIX*share`.`parent`, `share_type`, `share_with`, `file_source`, `path`, `permissions`, `stime`, `expiration`';
+				} else {
+					$select = '`id`, `item_type`, `item_source`, `parent`, `share_type`, `share_with`, `permissions`, `stime`, `file_source`, `expiration`';
+				}
+			} else {
+				if ($fileDependent) {
+					if (($itemType == 'file' || $itemType == 'folder') && $format == \OC_Share_Backend_File::FORMAT_FILE_APP || $format == \OC_Share_Backend_File::FORMAT_FILE_APP_ROOT) {
+						$select = '`*PREFIX*share`.`id`, `item_type`, `*PREFIX*share`.`parent`, `share_type`, `share_with`, `file_source`, `path`, `file_target`, `permissions`, `expiration`, `name`, `ctime`, `mtime`, `mimetype`, `size`, `encrypted`, `versioned`, `writable`';
+					} else {
+						$select = '`*PREFIX*share`.`id`, `item_type`, `item_source`, `item_target`, `*PREFIX*share`.`parent`, `share_type`, `share_with`, `uid_owner`, `file_source`, `path`, `file_target`, `permissions`, `stime`, `expiration`';
+					}
+				} else {
+					$select = '*';
+				}
+			}
+		}
+		$root = strlen($root);
+		$query = \OC_DB::prepare('SELECT '.$select.' FROM `*PREFIX*share` '.$where, $queryLimit);
+		$result = $query->execute($queryArgs);
+		$items = array();
+		$targets = array();
+		while ($row = $result->fetchRow()) {
+			// Filter out duplicate group shares for users with unique targets
+			if ($row['share_type'] == self::$shareTypeGroupUserUnique && isset($items[$row['parent']])) {
+				$row['share_type'] = self::SHARE_TYPE_GROUP;
+				$row['share_with'] = $items[$row['parent']]['share_with'];
+				// Remove the parent group share
+				unset($items[$row['parent']]);
+				if ($row['permissions'] == 0) {
+					continue;
+				}
+			} else if (!isset($uidOwner)) {
+				// Check if the same target already exists
+				if (isset($targets[$row[$column]])) {
+					// Check if the same owner shared with the user twice through a group and user share - this is allowed
+					$id = $targets[$row[$column]];
+					if ($items[$id]['uid_owner'] == $row['uid_owner']) {
+						// Switch to group share type to ensure resharing conditions aren't bypassed
+						if ($items[$id]['share_type'] != self::SHARE_TYPE_GROUP) {
+							$items[$id]['share_type'] = self::SHARE_TYPE_GROUP;
+							$items[$id]['share_with'] = $row['share_with'];
+						}
+						// Switch ids if sharing permission is granted on only one share to ensure correct parent is used if resharing
+						if (~(int)$items[$id]['permissions'] & self::PERMISSION_SHARE && (int)$row['permissions'] & self::PERMISSION_SHARE) {
+							$items[$row['id']] = $items[$id];
+							unset($items[$id]);
+							$id = $row['id'];
+						}
+						// Combine the permissions for the item
+						$items[$id]['permissions'] |= (int)$row['permissions'];
+						continue;
+					}
+				} else {
+					$targets[$row[$column]] = $row['id'];
+				}
+			}
+			// Remove root from file source paths if retrieving own shared items
+			if (isset($uidOwner) && isset($row['path'])) {
+				if (isset($row['parent'])) {
+					$row['path'] = '/Shared/'.basename($row['path']);
+				} else {
+					$row['path'] = substr($row['path'], $root);
+				}
+			}
+			if (isset($row['expiration'])) {
+				$time = new \DateTime();
+				if ($row['expiration'] < date('Y-m-d H:i', $time->format('U') - $time->getOffset())) {
+					self::delete($row['id']);
+					continue;
+				}
+			}
+			$items[$row['id']] = $row;
+		}
+		if (!empty($items)) {
+			$collectionItems = array();
+			foreach ($items as &$row) {
+				// Return only the item instead of a 2-dimensional array
+				if ($limit == 1 && $row['item_type'] == $itemType && $row[$column] == $item) {
+					if ($format == self::FORMAT_NONE) {
+						return $row;
+					} else {
+						break;
+					}
+				}
+				// Check if this is a collection of the requested item type
+				if ($includeCollections && $collectionTypes && in_array($row['item_type'], $collectionTypes)) {
+					if (($collectionBackend = self::getBackend($row['item_type'])) && $collectionBackend instanceof Share_Backend_Collection) {
+						// Collections can be inside collections, check if the item is a collection
+						if (isset($item) && $row['item_type'] == $itemType && $row[$column] == $item) {
+							$collectionItems[] = $row;
+						} else {
+							$collection = array();
+							$collection['item_type'] = $row['item_type'];
+							if ($row['item_type'] == 'file' || $row['item_type'] == 'folder') {
+								$collection['path'] = basename($row['path']);
+							}
+							$row['collection'] = $collection;
+							// Fetch all of the children sources
+							$children = $collectionBackend->getChildren($row[$column]);
+							foreach ($children as $child) {
+								$childItem = $row;
+								$childItem['item_type'] = $itemType;
+								if ($row['item_type'] != 'file' && $row['item_type'] != 'folder') {
+									$childItem['item_source'] = $child['source'];
+									$childItem['item_target'] = $child['target'];
+								}
+								if ($backend instanceof Share_Backend_File_Dependent) {
+									if ($row['item_type'] == 'file' || $row['item_type'] == 'folder') {
+										$childItem['file_source'] = $child['source'];
+									} else {
+										$childItem['file_source'] = \OC_FileCache::getId($child['file_path']);
+									}
+									$childItem['file_target'] = \OC_Filesystem::normalizePath($child['file_path']);
+								}
+								if (isset($item)) {
+									if ($childItem[$column] == $item) {
+										// Return only the item instead of a 2-dimensional array
+										if ($limit == 1) {
+											if ($format == self::FORMAT_NONE) {
+												return $childItem;
+											} else {
+												// Unset the items array and break out of both loops
+												$items = array();
+												$items[] = $childItem;
+												break 2;
+											}
+										} else {
+											$collectionItems[] = $childItem;
+										}
+									}
+								} else {
+									$collectionItems[] = $childItem;
+								}
+							}
+						}
+					}
+					// Remove collection item
+					unset($items[$row['id']]);
+				}
+			}
+			if (!empty($collectionItems)) {
+				$items = array_merge($items, $collectionItems);
+			}
+			if ($format == self::FORMAT_NONE) {
+				return $items;
+			} else if ($format == self::FORMAT_STATUSES) {
+				$statuses = array();
+				// Switch column to path for files and folders, used for determining statuses inside of folders
+				if ($itemType == 'file' || $itemType == 'folder') {
+					$column = 'path';
+				}
+				foreach ($items as $item) {
+					if ($item['share_type'] == self::SHARE_TYPE_LINK) {
+						$statuses[$item[$column]] = true;
+					} else if (!isset($statuses[$item[$column]])) {
+						$statuses[$item[$column]] = false;
+					}
+				}
+				return $statuses;
+			} else {
+				return $backend->formatItems($items, $format, $parameters);
+			}
+		} else if ($limit == 1 || (isset($uidOwner) && isset($item))) {
+			return false;
+		}
+		return array();
+	}
+
+	/**
+	* @brief Put shared item into the database
+	* @param string Item type
+	* @param string Item source
+	* @param int SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
+	* @param string User or group the item is being shared with
+	* @param int CRUDS permissions
+	* @param bool|array Parent folder target (optional)
+	* @return bool Returns true on success or false on failure
+	*/
+	private static function put($itemType, $itemSource, $shareType, $shareWith, $uidOwner, $permissions, $parentFolder = null) {
+		$backend = self::getBackend($itemType);
+		// Check if this is a reshare
+		if ($checkReshare = self::getItemSharedWithBySource($itemType, $itemSource, self::FORMAT_NONE, null, true)) {
+			// Check if attempting to share back to owner
+			if ($checkReshare['uid_owner'] == $shareWith && $shareType == self::SHARE_TYPE_USER) {
+				$message = 'Sharing '.$itemSource.' failed, because the user '.$shareWith.' is the original sharer';
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+			// Check if share permissions is granted
+			if ((int)$checkReshare['permissions'] & self::PERMISSION_SHARE) {
+				if (~(int)$checkReshare['permissions'] & $permissions) {
+					$message = 'Sharing '.$itemSource.' failed, because the permissions exceed permissions granted to '.$uidOwner;
+					\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+					throw new \Exception($message);
+				} else {
+					// TODO Don't check if inside folder
+					$parent = $checkReshare['id'];
+					$itemSource = $checkReshare['item_source'];
+					$fileSource = $checkReshare['file_source'];
+					$suggestedItemTarget = $checkReshare['item_target'];
+					$suggestedFileTarget = $checkReshare['file_target'];
+					$filePath = $checkReshare['file_target'];
+				}
+			} else {
+				$message = 'Sharing '.$itemSource.' failed, because resharing is not allowed';
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+		} else {
+			$parent = null;
+			$suggestedItemTarget = null;
+			$suggestedFileTarget = null;
+			if (!$backend->isValidSource($itemSource, $uidOwner)) {
+				$message = 'Sharing '.$itemSource.' failed, because the sharing backend for '.$itemType.' could not find its source';
+				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+				throw new \Exception($message);
+			}
+			$parent = null;
+			if ($backend instanceof Share_Backend_File_Dependent) {
+				$filePath = $backend->getFilePath($itemSource, $uidOwner);
+				if ($itemType == 'file' || $itemType == 'folder') {
+					$fileSource = $itemSource;
+				} else {
+					$fileSource = \OC_FileCache::getId($filePath);
+				}
+				if ($fileSource == -1) {
+					$message = 'Sharing '.$itemSource.' failed, because the file could not be found in the file cache';
+					\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+					throw new \Exception($message);
+				}
+			} else {
+				$filePath = null;
+				$fileSource = null;
+			}
+		}
+		$query = \OC_DB::prepare('INSERT INTO `*PREFIX*share` (`item_type`, `item_source`, `item_target`, `parent`, `share_type`, `share_with`, `uid_owner`, `permissions`, `stime`, `file_source`, `file_target`) VALUES (?,?,?,?,?,?,?,?,?,?,?)');
+		// Share with a group
+		if ($shareType == self::SHARE_TYPE_GROUP) {
+			$groupItemTarget = self::generateTarget($itemType, $itemSource, $shareType, $shareWith['group'], $uidOwner, $suggestedItemTarget);
+			if (isset($fileSource)) {
+				if ($parentFolder) {
+					if ($parentFolder === true) {
+						$groupFileTarget = self::generateTarget('file', $filePath, $shareType, $shareWith['group'], $uidOwner, $suggestedFileTarget);
+						// Set group default file target for future use
+						$parentFolders[0]['folder'] = $groupFileTarget;
+					} else {
+						// Get group default file target
+						$groupFileTarget = $parentFolder[0]['folder'].$itemSource;
+						$parent = $parentFolder[0]['id'];
+					}
+				} else {
+					$groupFileTarget = self::generateTarget('file', $filePath, $shareType, $shareWith['group'], $uidOwner, $suggestedFileTarget);
+				}
+			} else {
+				$groupFileTarget = null;
+			}
+			$query->execute(array($itemType, $itemSource, $groupItemTarget, $parent, $shareType, $shareWith['group'], $uidOwner, $permissions, time(), $fileSource, $groupFileTarget));
+			// Save this id, any extra rows for this group share will need to reference it
+			$parent = \OC_DB::insertid('*PREFIX*share');
+			// Loop through all users of this group in case we need to add an extra row
+			foreach ($shareWith['users'] as $uid) {
+				$itemTarget = self::generateTarget($itemType, $itemSource, self::SHARE_TYPE_USER, $uid, $uidOwner, $suggestedItemTarget, $parent);
+				if (isset($fileSource)) {
+					if ($parentFolder) {
+						if ($parentFolder === true) {
+							$fileTarget = self::generateTarget('file', $filePath, self::SHARE_TYPE_USER, $uid, $uidOwner, $suggestedFileTarget, $parent);
+							if ($fileTarget != $groupFileTarget) {
+								$parentFolders[$uid]['folder'] = $fileTarget;
+							}
+						} else if (isset($parentFolder[$uid])) {
+							$fileTarget = $parentFolder[$uid]['folder'].$itemSource;
+							$parent = $parentFolder[$uid]['id'];
+						}
+					} else {
+						$fileTarget = self::generateTarget('file', $filePath, self::SHARE_TYPE_USER, $uid, $uidOwner, $suggestedFileTarget, $parent);
+					}
+				} else {
+					$fileTarget = null;
+				}
+				// Insert an extra row for the group share if the item or file target is unique for this user
+				if ($itemTarget != $groupItemTarget || (isset($fileSource) && $fileTarget != $groupFileTarget)) {
+					$query->execute(array($itemType, $itemSource, $itemTarget, $parent, self::$shareTypeGroupUserUnique, $uid, $uidOwner, $permissions, time(), $fileSource, $fileTarget));
+					\OC_DB::insertid('*PREFIX*share');
+				}
+			}
+			if ($parentFolder === true) {
+				// Return parent folders to preserve file target paths for potential children
+				return $parentFolders;
+			}
+		} else {
+			$itemTarget = self::generateTarget($itemType, $itemSource, $shareType, $shareWith, $uidOwner, $suggestedItemTarget);
+			if (isset($fileSource)) {
+				if ($parentFolder) {
+					if ($parentFolder === true) {
+						$fileTarget = self::generateTarget('file', $filePath, $shareType, $shareWith, $uidOwner, $suggestedFileTarget);
+						$parentFolders['folder'] = $fileTarget;
+					} else {
+						$fileTarget = $parentFolder['folder'].$itemSource;
+						$parent = $parentFolder['id'];
+					}
+				} else {
+					$fileTarget = self::generateTarget('file', $filePath, $shareType, $shareWith, $uidOwner, $suggestedFileTarget);
+				}
+			} else {
+				$fileTarget = null;
+			}
+			$query->execute(array($itemType, $itemSource, $itemTarget, $parent, $shareType, $shareWith, $uidOwner, $permissions, time(), $fileSource, $fileTarget));
+			$id = \OC_DB::insertid('*PREFIX*share');
+			if ($parentFolder === true) {
+				$parentFolders['id'] = $id;
+				// Return parent folder to preserve file target paths for potential children
+				return $parentFolders;
+			}
+		}
+		return true;
+	}
+
+	/**
+	* @brief Generate a unique target for the item
+	* @param string Item type
+	* @param string Item source
+	* @param int SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
+	* @param string User or group the item is being shared with
+	* @param string The suggested target originating from a reshare (optional)
+	* @param int The id of the parent group share (optional)
+	* @return string Item target
+	*/
+	private static function generateTarget($itemType, $itemSource, $shareType, $shareWith, $uidOwner, $suggestedTarget = null, $groupParent = null) {
+		$backend = self::getBackend($itemType);
+		if ($shareType == self::SHARE_TYPE_LINK) {
+			if (isset($suggestedTarget)) {
+				return $suggestedTarget;
+			}
+			return $backend->generateTarget($itemSource, false);
+		} else {
+			if ($itemType == 'file' || $itemType == 'folder') {
+				$column = 'file_target';
+			} else {
+				$column = 'item_target';
+			}
+			if ($shareType == self::SHARE_TYPE_USER) {
+				// Share with is a user, so set share type to user and groups
+				$shareType = self::$shareTypeUserAndGroups;
+				$userAndGroups = array_merge(array($shareWith), \OC_Group::getUserGroups($shareWith));
+			} else {
+				$userAndGroups = false;
+			}
+			$exclude = null;
+			// Backend has 3 opportunities to generate a unique target
+			for ($i = 0; $i < 2; $i++) {
+				// Check if suggested target exists first
+				if ($i == 0 && isset($suggestedTarget)) {
+					$target = $suggestedTarget;
+				} else {
+					if ($shareType == self::SHARE_TYPE_GROUP) {
+						$target = $backend->generateTarget($itemSource, false, $exclude);
+					} else {
+						$target = $backend->generateTarget($itemSource, $shareWith, $exclude);
+					}
+					if (is_array($exclude) && in_array($target, $exclude)) {
+						break;
+					}
+				}
+				// Check if target already exists
+				$checkTarget = self::getItems($itemType, $target, $shareType, $shareWith);
+				if (!empty($checkTarget)) {
+					foreach ($checkTarget as $item) {
+						// Skip item if it is the group parent row
+						if (isset($groupParent) && $item['id'] == $groupParent) {
+							if (count($checkTarget) == 1) {
+								return $target;
+							} else {
+								continue;
+							}
+						}
+						// If matching target is from the same owner, use the same target. The share type will be different so this isn't the same share.
+						if ($item['uid_owner'] == $uidOwner) {
+							return $target;
+						}
+					}
+					if (!isset($exclude)) {
+						$exclude = array();
+					}
+					// Find similar targets to improve backend's chances to generate a unqiue target
+					if ($userAndGroups) {
+						$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share` WHERE `item_type` = ? AND `share_type` IN (?,?,?) AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\') AND `'.$column.'` LIKE ?');
+						$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_USER, self::SHARE_TYPE_GROUP, self::$shareTypeGroupUserUnique, '%'.$target.'%'));
+					} else {
+						$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share` WHERE `item_type` = ? AND `share_type` = ? AND `share_with` = ? AND `'.$column.'` LIKE ?');
+						$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_GROUP, $shareWith, '%'.$target.'%'));
+					}
+					while ($row = $result->fetchRow()) {
+						$exclude[] = $row[$column];
+					}
+				} else {
+					return $target;
+				}
+			}
+		}
+		$message = 'Sharing backend registered for '.$itemType.' did not generate a unique target for '.$itemSource;
+		\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
+		throw new \Exception($message);
+	}
+
+	/**
+	* @brief Delete all reshares of an item
+	* @param int Id of item to delete
+	* @param bool If true, exclude the parent from the delete (optional)
+	* @param string The user that the parent was shared with (optinal)
+	*/
+	private static function delete($parent, $excludeParent = false, $uidOwner = null) {
+		$ids = array($parent);
+		$parents = array($parent);
+		while (!empty($parents)) {
+			$parents = "'".implode("','", $parents)."'";
+			// Check the owner on the first search of reshares, useful for finding and deleting the reshares by a single user of a group share
+			if (count($ids) == 1 && isset($uidOwner)) {
+				$query = \OC_DB::prepare('SELECT `id` FROM `*PREFIX*share` WHERE `parent` IN ('.$parents.') AND `uid_owner` = ?');
+				$result = $query->execute(array($uidOwner));
+			} else {
+				$query = \OC_DB::prepare('SELECT `id`, `item_type`, `item_target`, `parent`, `uid_owner` FROM `*PREFIX*share` WHERE `parent` IN ('.$parents.')');
+				$result = $query->execute();
+			}
+			// Reset parents array, only go through loop again if items are found
+			$parents = array();
+			while ($item = $result->fetchRow()) {
+				// Search for a duplicate parent share, this occurs when an item is shared to the same user through a group and user or the same item is shared by different users
+				$userAndGroups = array_merge(array($item['uid_owner']), \OC_Group::getUserGroups($item['uid_owner']));
+				$query = \OC_DB::prepare('SELECT `id`, `permissions` FROM `*PREFIX*share` WHERE `item_type` = ? AND `item_target` = ? AND `share_type` IN (?,?,?) AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\') AND `uid_owner` != ? AND `id` != ?');
+				$duplicateParent = $query->execute(array($item['item_type'], $item['item_target'], self::SHARE_TYPE_USER, self::SHARE_TYPE_GROUP, self::$shareTypeGroupUserUnique, $item['uid_owner'], $item['parent']))->fetchRow();
+				if ($duplicateParent) {
+					// Change the parent to the other item id if share permission is granted
+					if ($duplicateParent['permissions'] & self::PERMISSION_SHARE) {
+						$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `parent` = ? WHERE `id` = ?');
+						$query->execute(array($duplicateParent['id'], $item['id']));
+						continue;
+					}
+				}
+				$ids[] = $item['id'];
+				$parents[] = $item['id'];
+			}
+		}
+		if ($excludeParent) {
+			unset($ids[0]);
+		}
+		if (!empty($ids)) {
+			$ids = "'".implode("','", $ids)."'";
+			$query = \OC_DB::prepare('DELETE FROM `*PREFIX*share` WHERE `id` IN ('.$ids.')');
+			$query->execute();
+		}
+	}
+
+	/**
+	* Hook Listeners
+	*/
+
+	public static function post_deleteUser($arguments) {
+		// Delete any items shared with the deleted user
+		$query = \OC_DB::prepare('DELETE FROM `*PREFIX*share` WHERE `share_with` = ? AND `share_type` = ? OR `share_type` = ?');
+		$result = $query->execute(array($arguments['uid'], self::SHARE_TYPE_USER, self::$shareTypeGroupUserUnique));
+		// Delete any items the deleted user shared
+		$query = \OC_DB::prepare('SELECT `id` FROM `*PREFIX*share` WHERE `uid_owner` = ?');
+		$result = $query->execute(array($arguments['uid']));
+		while ($item = $result->fetchRow()) {
+			self::delete($item['id']);
+		}
+	}
+
+	public static function post_addToGroup($arguments) {
+		// Find the group shares and check if the user needs a unique target
+		$query = \OC_DB::prepare('SELECT * FROM `*PREFIX*share` WHERE `share_type` = ? AND `share_with` = ?');
+		$result = $query->execute(array(self::SHARE_TYPE_GROUP, $arguments['gid']));
+		$query = \OC_DB::prepare('INSERT INTO `*PREFIX*share` (`item_type`, `item_source`, `item_target`, `parent`, `share_type`, `share_with`, `uid_owner`, `permissions`, `stime`, `file_source`, `file_target`) VALUES (?,?,?,?,?,?,?,?,?,?,?)');
+		while ($item = $result->fetchRow()) {
+			if ($item['item_type'] == 'file' || $item['item_type'] == 'file') {
+				$itemTarget = null;
+			} else {
+				$itemTarget = self::generateTarget($item['item_type'], $item['item_source'], self::SHARE_TYPE_USER, $arguments['uid'], $item['uid_owner'], $item['item_target'], $item['id']);
+			}
+			if (isset($item['file_source'])) {
+				$fileTarget = self::generateTarget($item['item_type'], $item['item_source'], self::SHARE_TYPE_USER, $arguments['uid'], $item['uid_owner'], $item['file_target'], $item['id']);
+			} else {
+				$fileTarget = null;
+			}
+			// Insert an extra row for the group share if the item or file target is unique for this user
+			if ($itemTarget != $item['item_target'] || $fileTarget != $item['file_target']) {
+				$query->execute(array($item['item_type'], $item['item_source'], $itemTarget, $item['id'], self::$shareTypeGroupUserUnique, $arguments['uid'], $item['uid_owner'], $item['permissions'], $item['stime'], $item['file_source'], $fileTarget));
+				\OC_DB::insertid('*PREFIX*share');
+			}
+		}
+	}
+
+	public static function post_removeFromGroup($arguments) {
+		// TODO Don't call if user deleted?
+		$query = \OC_DB::prepare('SELECT `id`, `share_type` FROM `*PREFIX*share` WHERE (`share_type` = ? AND `share_with` = ?) OR (`share_type` = ? AND `share_with` = ?)');
+		$result = $query->execute(array(self::SHARE_TYPE_GROUP, $arguments['gid'], self::$shareTypeGroupUserUnique, $arguments['uid']));
+		while ($item = $result->fetchRow()) {
+			if ($item['share_type'] == self::SHARE_TYPE_GROUP) {
+				// Delete all reshares by this user of the group share
+				self::delete($item['id'], true, $arguments['uid']);
+			} else {
+				self::delete($item['id']);
+			}
+		}
+	}
+
+	public static function post_deleteGroup($arguments) {
+		$query = \OC_DB::prepare('SELECT id FROM `*PREFIX*share` WHERE `share_type` = ? AND `share_with` = ?');
+		$result = $query->execute(array(self::SHARE_TYPE_GROUP, $arguments['gid']));
+		while ($item = $result->fetchRow()) {
+			self::delete($item['id']);
+		}
+	}
+
+}
+
+/**
+* Interface that apps must implement to share content.
+*/
+interface Share_Backend {
+
+	/**
+	* @brief Get the source of the item to be stored in the database
+	* @param string Item source
+	* @param string Owner of the item
+	* @return mixed|array|false Source
+	*
+	* Return an array if the item is file dependent, the array needs two keys: 'item' and 'file'
+	* Return false if the item does not exist for the user
+	*
+	* The formatItems() function will translate the source returned back into the item
+	*/
+	public function isValidSource($itemSource, $uidOwner);
+
+	/**
+	* @brief Get a unique name of the item for the specified user
+	* @param string Item source
+	* @param string|false User the item is being shared with
+	* @param array|null List of similar item names already existing as shared items
+	* @return string Target name
+	*
+	* This function needs to verify that the user does not already have an item with this name.
+	* If it does generate a new name e.g. name_#
+	*/
+	public function generateTarget($itemSource, $shareWith, $exclude = null);
+
+	/**
+	* @brief Converts the shared item sources back into the item in the specified format
+	* @param array Shared items
+	* @param int Format
+	* @return ?
+	*
+	* The items array is a 3-dimensional array with the item_source as the first key and the share id as the second key to an array with the share info.
+	* The key/value pairs included in the share info depend on the function originally called:
+	* If called by getItem(s)Shared: id, item_type, item, item_source, share_type, share_with, permissions, stime, file_source
+	* If called by getItem(s)SharedWith: id, item_type, item, item_source, item_target, share_type, share_with, permissions, stime, file_source, file_target
+	* This function allows the backend to control the output of shared items with custom formats.
+	* It is only called through calls to the public getItem(s)Shared(With) functions.
+	*/
+	public function formatItems($items, $format, $parameters = null);
+
+}
+
+/**
+* Interface for share backends that share content that is dependent on files.
+* Extends the Share_Backend interface.
+*/
+interface Share_Backend_File_Dependent extends Share_Backend {
+
+	/**
+	* @brief Get the file path of the item
+	* @param
+	* @param
+	* @return
+	*/
+	public function getFilePath($itemSource, $uidOwner);
+
+}
+
+/**
+* Interface for collections of of items implemented by another share backend.
+* Extends the Share_Backend interface.
+*/
+interface Share_Backend_Collection extends Share_Backend {
+
+	/**
+	* @brief Get the sources of the children of the item
+	* @param string Item source
+	* @return array Returns an array of children each inside an array with the keys: source, target, and file_path if applicable
+	*/
+	public function getChildren($itemSource);
+
+}
diff --git a/lib/public/template.php b/lib/public/template.php
index a0ed618cb2c..4cda3650866 100644
--- a/lib/public/template.php
+++ b/lib/public/template.php
@@ -26,7 +26,7 @@
  *
  */
 
-// use OCP namespace for all classes that are considered public. 
+// use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP;
 
@@ -39,7 +39,7 @@ namespace OCP;
  *
  * For further information have a look at OC_Helper::imagePath
  */
-function image_path( $app, $image ){
+function image_path( $app, $image ) {
 	return(\image_path( $app, $image ));
 }
 
@@ -50,7 +50,7 @@ function image_path( $app, $image ){
  * @param $mimetype mimetype
  * @returns link to the image
  */
-function mimetype_icon( $mimetype ){
+function mimetype_icon( $mimetype ) {
 	return(\mimetype_icon( $mimetype ));
 }
 
@@ -61,7 +61,7 @@ function mimetype_icon( $mimetype ){
  * @param $bytes size in bytes
  * @returns size as string
  */
-function human_file_size( $bytes ){
+function human_file_size( $bytes ) {
 	return(\human_file_size( $bytes ));
 }
 
@@ -88,13 +88,13 @@ function simple_file_size($bytes) {
 
 /**
  * @brief Generate html code for an options block.
- * @param $options the options 
- * @param $selected which one is selected? 
- * @param $params the parameters 
+ * @param $options the options
+ * @param $selected which one is selected?
+ * @param $params the parameters
  * @returns html options
  */
 function html_select_options($options, $selected, $params=array()) {
-	return(\html_select_options($options, $selected, $params)); 
+	return(\html_select_options($options, $selected, $params));
 }
 
 
diff --git a/lib/public/user.php b/lib/public/user.php
index 713e366b968..b320ce8ea0c 100644
--- a/lib/public/user.php
+++ b/lib/public/user.php
@@ -26,7 +26,7 @@
  *
  */
 
-// use OCP namespace for all classes that are considered public. 
+// use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP;
 
@@ -34,60 +34,53 @@ namespace OCP;
  * This class provides access to the user management. You can get information about the currently logged in user and the permissions for example
  */
 class User {
-
-
 	/**
 	 * @brief get the user id of the user currently logged in.
 	 * @return string uid or false
 	 */
-	public static function getUser(){
+	public static function getUser() {
 		return \OC_USER::getUser();
 	}
 
-
 	/**
 	 * @brief Get a list of all users
 	 * @returns array with all uids
 	 *
 	 * Get a list of all users.
 	 */
-	public static function getUsers(){
+	public static function getUsers($search = '', $limit = null, $offset = null) {
 		return \OC_USER::getUsers();
 	}
 
-
 	/**
 	 * @brief Check if the user is logged in
 	 * @returns true/false
 	 *
 	 * Checks if the user is logged in
 	 */
-	public static function isLoggedIn(){
+	public static function isLoggedIn() {
 		return \OC_USER::isLoggedIn();
 	}
 
-
 	/**
 	 * @brief check if a user exists
 	 * @param string $uid the username
 	 * @return boolean
 	 */
-	public static function userExists( $uid ){
+	public static function userExists( $uid ) {
 		return \OC_USER::userExists( $uid );
 	}
 
-
 	/**
 	 * @brief Loggs the user out including all the session data
 	 * @returns true
 	 *
 	 * Logout, destroys session
 	 */
-	public static function logout(){
+	public static function logout() {
 		return \OC_USER::logout();
 	}
 
-
 	/**
 	 * @brief Check if the password is correct
 	 * @param $uid The username
@@ -96,27 +89,22 @@ class User {
 	 *
 	 * Check if the password is correct without logging in the user
 	 */
-	public static function checkPassword( $uid, $password ){
+	public static function checkPassword( $uid, $password ) {
 		return \OC_USER::checkPassword( $uid, $password );
 	}
 
+	/**
+	* Check if the user is a admin, redirects to home if not
+	*/
+	public static function checkAdminUser() {
+		\OC_Util::checkAdminUser();
+	}
 
-        /**
-        * Check if the user is a admin, redirects to home if not
-        */
-        public static function checkAdminUser(){
-                \OC_Util::checkAdminUser();
-        }
-
-
-        /**
-        * Check if the user is logged in, redirects to home if not. With
-        * redirect URL parameter to the request URI.
-        */
-        public static function checkLoggedIn(){
-                \OC_Util::checkLoggedIn();
-        }
-
-
-
+	/**
+	* Check if the user is logged in, redirects to home if not. With
+	* redirect URL parameter to the request URI.
+	*/
+	public static function checkLoggedIn() {
+		\OC_Util::checkLoggedIn();
+	}
 }
diff --git a/lib/public/util.php b/lib/public/util.php
index 75ca29f7129..747448e62eb 100644
--- a/lib/public/util.php
+++ b/lib/public/util.php
@@ -34,8 +34,6 @@ namespace OCP;
  * This class provides different helper functions to make the life of a developer easier
  */
 class Util {
-
-
 	// consts for Logging
 	const DEBUG=0;
 	const INFO=1;
@@ -43,16 +41,14 @@ class Util {
 	const ERROR=3;
 	const FATAL=4;
 
-
 	/**
 	 * @brief get the current installed version of ownCloud
 	 * @return array
 	 */
-	public static function getVersion(){
+	public static function getVersion() {
 		return(\OC_Util::getVersion());
 	}
 
-
 	/**
 	 * @brief send an email
 	 * @param string $toaddress
@@ -68,36 +64,33 @@ class Util {
 		\OC_MAIL::send( $toaddress, $toname, $subject, $mailtext, $fromaddress, $fromname, $html=0, $altbody='', $ccaddress='', $ccname='', $bcc='');
 	}
 
-
-        /**
+	/**
 	 * @brief write a message in the log
 	 * @param string $app
 	 * @param string $message
 	 * @param int level
-         */
-        public static function writeLog( $app, $message, $level ) {
-                // call the internal log class
-                \OC_LOG::write( $app, $message, $level );
-        }
-
+	 */
+	public static function writeLog( $app, $message, $level ) {
+		// call the internal log class
+		\OC_LOG::write( $app, $message, $level );
+	}
 
 	/**
 	 * @brief add a css file
 	 * @param url  $url
 	 */
-	public static function addStyle( $application, $file = null ){
+	public static function addStyle( $application, $file = null ) {
 		\OC_Util::addStyle( $application, $file );
-        }
-
+	}
 
 	/**
 	 * @brief add a javascript file
 	 * @param appid  $application
 	 * @param filename  $file
 	 */
-	public static function addScript( $application, $file = null ){
+	public static function addScript( $application, $file = null ) {
 		\OC_Util::addScript( $application, $file );
-        }
+	}
 
 	/**
 	 * @brief Add a custom element to the header
@@ -105,7 +98,7 @@ class Util {
 	 * @param array $attributes array of attributes for the element
 	 * @param string $text the text content for the element
 	 */
-	public static function addHeader( $tag, $attributes, $text=''){
+	public static function addHeader( $tag, $attributes, $text='') {
 		\OC_Util::addHeader( $tag, $attributes, $text );
 	}
 
@@ -114,25 +107,23 @@ class Util {
 	 * @param int timestamp $timestamp
 	 * @param bool dateOnly option to ommit time from the result
 	 */
-	public static function formatDate( $timestamp,$dateOnly=false){
+	public static function formatDate( $timestamp,$dateOnly=false) {
 		return(\OC_Util::formatDate( $timestamp,$dateOnly ));
 	}
 
-
-
 	/**
 	 * @brief Creates an absolute url
 	 * @param $app app
 	 * @param $file file
+	 * @param $args array with param=>value, will be appended to the returned url
 	 * @returns the url
 	 *
 	 * Returns a absolute url to the given app and file.
 	 */
-	public static function linkToAbsolute( $app, $file ) {
-		return(\OC_Helper::linkToAbsolute( $app, $file ));
+	public static function linkToAbsolute( $app, $file, $args = array() ) {
+		return(\OC_Helper::linkToAbsolute( $app, $file, $args ));
 	}
 
-
 	/**
 	 * @brief Creates an absolute url for remote use
 	 * @param $service id
@@ -144,17 +135,28 @@ class Util {
 		return(\OC_Helper::linkToRemote( $service ));
 	}
 
+	/**
+	 * @brief Creates an absolute url for public use
+	 * @param $service id
+	 * @returns the url
+	 *
+	 * Returns a absolute url to the given app and file.
+	 */
+	public static function linkToPublic($service) {
+		return \OC_Helper::linkToPublic($service);
+	}
 
 	/**
 	* @brief Creates an url
 	* @param $app app
 	* @param $file file
+	* @param $args array with param=>value, will be appended to the returned url
 	* @returns the url
 	*
 	* Returns a url to the given app and file.
 	*/
-	public static function linkTo( $app, $file ){
-		return(\OC_Helper::linkTo( $app, $file ));
+	public static function linkTo( $app, $file, $args = array() ) {
+		return(\OC_Helper::linkTo( $app, $file, $args ));
 	}
 
 	/**
@@ -165,7 +167,7 @@ class Util {
 	 * reverse proxies
 	 */
 	public static function getServerHost() {
-		return(\OC_Helper::serverHost());
+		return(\OC_Request::serverHost());
 	}
 
 	/**
@@ -175,7 +177,7 @@ class Util {
 	 * Returns the server protocol. It respects reverse proxy servers and load balancers
 	 */
 	public static function getServerProtocol() {
-		return(\OC_Helper::serverProtocol());
+		return(\OC_Request::serverProtocol());
 	}
 
 	/**
@@ -186,11 +188,10 @@ class Util {
 	 *
 	 * Returns the path to the image.
 	 */
-        public static function imagePath( $app, $image ){
+	public static function imagePath( $app, $image ) {
 		return(\OC_Helper::imagePath( $app, $image ));
 	}
 
-
 	/**
 	 * @brief Make a human file size
 	 * @param $bytes file size in bytes
@@ -198,7 +199,7 @@ class Util {
 	 *
 	 * Makes 2048 to 2 kB.
 	 */
-	public static function humanFileSize( $bytes ){
+	public static function humanFileSize( $bytes ) {
 		return(\OC_Helper::humanFileSize( $bytes ));
 	}
 
@@ -211,7 +212,7 @@ class Util {
 	 *
 	 * Inspired by: http://www.php.net/manual/en/function.filesize.php#92418
 	 */
-	public static function computerFileSize( $str ){
+	public static function computerFileSize( $str ) {
 		return(\OC_Helper::computerFileSize( $str ));
 	}
 
@@ -227,11 +228,10 @@ class Util {
 	 *
 	 * TODO: write example
 	 */
-	static public function connectHook( $signalclass, $signalname, $slotclass, $slotname ){
+	static public function connectHook( $signalclass, $signalname, $slotclass, $slotname ) {
 		return(\OC_Hook::connect( $signalclass, $signalname, $slotclass, $slotname ));
 	}
 
-
 	/**
 	 * @brief emitts a signal
 	 * @param $signalclass class name of emitter
@@ -243,25 +243,23 @@ class Util {
 	 *
 	 * TODO: write example
 	 */
-	static public function emitHook( $signalclass, $signalname, $params = array()){
+	static public function emitHook( $signalclass, $signalname, $params = array()) {
 		return(\OC_Hook::emit( $signalclass, $signalname, $params ));
 	}
 
-
 	/**
- 	 * Register an get/post call. This is important to prevent CSRF attacks
+	 * Register an get/post call. This is important to prevent CSRF attacks
 	 * TODO: write example
 	 */
-	public static function callRegister(){
+	public static function callRegister() {
 		return(\OC_Util::callRegister());
 	}
 
-
 	/**
 	 * Check an ajax get/post call if the request token is valid. exit if not.
 	 * Todo: Write howto
 	 */
-	public static function callCheck(){
+	public static function callCheck() {
 		return(\OC_Util::callCheck());
 	}
 
@@ -273,7 +271,7 @@ class Util {
 	 * @param string or array of strings
 	 * @return array with sanitized strings or a single sinitized string, depends on the input parameter.
 	 */
-	public static function sanitizeHTML( $value ){
+	public static function sanitizeHTML( $value ) {
 		return(\OC_Util::sanitizeHTML($value));
 	}
 
@@ -287,7 +285,7 @@ class Util {
 	*
 	*
 	*/
-	public static function mb_array_change_key_case($input, $case = MB_CASE_LOWER, $encoding = 'UTF-8'){
+	public static function mb_array_change_key_case($input, $case = MB_CASE_LOWER, $encoding = 'UTF-8') {
 		return(\OC_Helper::mb_array_change_key_case($input, $case, $encoding));
 	}