added private share api

1 files changed, 58 insertions, 1647 deletions

diff --git a/lib/public/share.php b/lib/public/share.php
index 5066d40354d..adc02dfe8c4 100644
--- a/lib/public/share.php
+++ b/lib/public/share.php
@@ -2,8 +2,9 @@
 /**
  * ownCloud
  *
- * @author Michael Gapczynski
- * @copyright 2012 Michael Gapczynski mtgap@owncloud.com
+ * @author Bjoern Schiessle, Michael Gapczynski
+ * @copyright 2012 Michael Gapczynski <mtgap@owncloud.com>
+ *            2014 Bjoern Schiessle <schiessle@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
@@ -38,6 +39,10 @@ namespace OCP;
  */
 class Share {
 
+	const FORMAT_NONE = -1;
+	const FORMAT_STATUSES = -2;
+	const FORMAT_SOURCES = -3;
+
 	const SHARE_TYPE_USER = 0;
 	const SHARE_TYPE_GROUP = 1;
 	const SHARE_TYPE_LINK = 3;
@@ -45,77 +50,26 @@ class Share {
 	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
-	 * @see lib/public/constants.php
-	 */
-
-	const FORMAT_NONE = -1;
-	const FORMAT_STATUSES = -2;
-	const FORMAT_SOURCES = -3;
-
-	const TOKEN_LENGTH = 32; // see db_structure.xml
-
-	private static $shareTypeUserAndGroups = -1;
-	private static $shareTypeGroupUserUnique = 2;
-	private static $backends = array();
-	private static $backendTypes = array();
-	private static $isResharingAllowed;
-
 	/**
 	 * 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
-	 * @param string $itemType
-	 * @param string $class
-	 * @param string $collectionOf
-	 * @return boolean true if backend is registered or false if error
+	 * @return Returns true if backend is registered or false if error
 	 */
 	public static function registerBackend($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;
+		return \OC\Share\Share::registerBackend($itemType, $class, $collectionOf, $supportedFileExtensions);
 	}
 
 	/**
 	 * Check if the Share API is enabled
-	 * @return boolean true if enabled or false
+	 * @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;
+		return \OC\Share\Share::isEnabled();
 	}
 
 	/**
@@ -123,22 +77,13 @@ class Share {
 	 * @param string $path path
 	 * @return string Prepared path
 	 */
-	public static function prepFileTarget( $path ) {
-
-		// Paths in DB are stored with leading slashes, so add one if necessary
-		if ( substr( $path, 0, 1 ) !== '/' ) {
-
-			$path = '/' . $path;
-
-		}
-
-		return $path;
-
+	public static function prepFileTarget($path) {
+		return \OC\Share\Share::prepFileTarget($path);
 	}
 
 	/**
 	 * Find which users can access a shared item
-	 * @param string $path to the file
+	 * @param $path to the file
 	 * @param $user owner of the file
 	 * @param include owner to the list of users with access to the file
 	 * @return array
@@ -146,101 +91,7 @@ class Share {
 	 *       not '/admin/data/file.txt'
 	 */
 	public static function getUsersSharingFile($path, $user, $includeOwner = false) {
-
-		$shares = array();
-		$publicShare = false;
-		$source = -1;
-		$cache = false;
-
-		$view = new \OC\Files\View('/' . $user . '/files');
-		if ($view->file_exists($path)) {
-			$meta = $view->getFileInfo($path);
-		} else {
-			// if the file doesn't exists yet we start with the parent folder
-			$meta = $view->getFileInfo(dirname($path));
-		}
-
-		if($meta !== false) {
-			$source = $meta['fileid'];
-			$cache = new \OC\Files\Cache\Cache($meta['storage']);
-		}
-
-		while ($source !== -1) {
-
-			// Fetch all shares with another user
-			$query = \OC_DB::prepare(
-				'SELECT `share_with`
-				FROM
-				`*PREFIX*share`
-				WHERE
-				`item_source` = ? AND `share_type` = ? AND `item_type` IN (\'file\', \'folder\')'
-			);
-
-			$result = $query->execute(array($source, self::SHARE_TYPE_USER));
-
-			if (\OCP\DB::isError($result)) {
-				\OCP\Util::writeLog('OCP\Share', \OC_DB::getErrorMessage($result), \OC_Log::ERROR);
-			} else {
-				while ($row = $result->fetchRow()) {
-					$shares[] = $row['share_with'];
-				}
-			}
-			// We also need to take group shares into account
-
-			$query = \OC_DB::prepare(
-				'SELECT `share_with`
-				FROM
-				`*PREFIX*share`
-				WHERE
-				`item_source` = ? AND `share_type` = ? AND `item_type` IN (\'file\', \'folder\')'
-			);
-
-			$result = $query->execute(array($source, self::SHARE_TYPE_GROUP));
-
-			if (\OCP\DB::isError($result)) {
-				\OCP\Util::writeLog('OCP\Share', \OC_DB::getErrorMessage($result), \OC_Log::ERROR);
-			} else {
-				while ($row = $result->fetchRow()) {
-					$usersInGroup = \OC_Group::usersInGroup($row['share_with']);
-					$shares = array_merge($shares, $usersInGroup);
-				}
-			}
-
-			//check for public link shares
-			if (!$publicShare) {
-				$query = \OC_DB::prepare(
-					'SELECT `share_with`
-					FROM
-					`*PREFIX*share`
-					WHERE
-					`item_source` = ? AND `share_type` = ? AND `item_type` IN (\'file\', \'folder\')'
-				);
-
-				$result = $query->execute(array($source, self::SHARE_TYPE_LINK));
-
-				if (\OCP\DB::isError($result)) {
-					\OCP\Util::writeLog('OCP\Share', \OC_DB::getErrorMessage($result), \OC_Log::ERROR);
-				} else {
-					if ($result->fetchRow()) {
-						$publicShare = true;
-					}
-				}
-			}
-
-			// let's get the parent for the next round
-			$meta = $cache->get((int)$source);
-			if($meta !== false) {
-				$source = (int)$meta['parent'];
-			} else {
-				$source = -1;
-			}
-		}
-		// Include owner in list of users, if requested
-		if ($includeOwner) {
-			$shares[] = $user;
-		}
-
-		return array("users" => array_unique($shares), "public" => $publicShare);
+		return \OC\Share\Share::getUsersSharingFile($path, $user, $includeOwner);
 	}
 
 	/**
@@ -250,13 +101,12 @@ class Share {
 	 * @param mixed Parameters (optional)
 	 * @param int Number of items to return (optional) Returns all by default
 	 * @param bool include collections (optional)
-	 * @param string $itemType
 	 * @return Return depends on format
 	 */
 	public static function getItemsSharedWith($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, $includeCollections);
+
+		return \OC\Share\Share::getItemsSharedWith($itemType, $format, $parameters, $limit, $includeCollections);
 	}
 
 	/**
@@ -266,12 +116,12 @@ class Share {
 	 * @param int $format (optional) Format type must be defined by the backend
 	 * @param mixed Parameters (optional)
 	 * @param bool include collections (optional)
-	 * @return string depends on format
+	 * @return Return depends on format
 	 */
 	public static function getItemSharedWith($itemType, $itemTarget, $format = self::FORMAT_NONE,
 		$parameters = null, $includeCollections = false) {
-		return self::getItems($itemType, $itemTarget, self::$shareTypeUserAndGroups, \OC_User::getUser(), null, $format,
-			$parameters, 1, $includeCollections);
+
+		return \OC\Share\Share::getItemSharedWith($itemType, $itemTarget, $format, $parameters, $includeCollections);
 	}
 
 	/**
@@ -282,45 +132,7 @@ class Share {
 	 * @return array Return list of items with file_target, permissions and expiration
 	 */
 	public static function getItemSharedWithUser($itemType, $itemSource, $user) {
-
-		$shares = array();
-
-		// first check if there is a db entry for the specific user
-		$query = \OC_DB::prepare(
-				'SELECT `file_target`, `permissions`, `expiration`
-					FROM
-					`*PREFIX*share`
-					WHERE
-					`item_source` = ? AND `item_type` = ? AND `share_with` = ?'
-				);
-
-		$result = \OC_DB::executeAudited($query, array($itemSource, $itemType, $user));
-
-		while ($row = $result->fetchRow()) {
-			$shares[] = $row;
-		}
-
-		//if didn't found a result than let's look for a group share.
-		if(empty($shares)) {
-			$groups = \OC_Group::getUserGroups($user);
-
-			$query = \OC_DB::prepare(
-					'SELECT `file_target`, `permissions`, `expiration`
-						FROM
-						`*PREFIX*share`
-						WHERE
-						`item_source` = ? AND `item_type` = ? AND `share_with` in (?)'
-					);
-
-			$result = \OC_DB::executeAudited($query, array($itemSource, $itemType, implode(',', $groups)));
-
-			while ($row = $result->fetchRow()) {
-				$shares[] = $row;
-			}
-		}
-
-		return $shares;
-
+		return \OC\Share\Share::getItemSharedWithUser($itemType, $itemSource, $user);
 	}
 
 	/**
@@ -334,8 +146,7 @@ class Share {
 	 */
 	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, $includeCollections, true);
+		return \OC\Share\Share::getItemSharedWithBySource($itemType, $itemSource, $format, $parameters, $includeCollections);
 	}
 
 	/**
@@ -346,8 +157,7 @@ class Share {
 	 * @return Item
 	 */
 	public static function getItemSharedWithByLink($itemType, $itemSource, $uidOwner) {
-		return self::getItems($itemType, $itemSource, self::SHARE_TYPE_LINK, null, $uidOwner, self::FORMAT_NONE,
-			null, 1);
+		return \OC\Share\Share::getItemSharedWithByLink($itemType, $itemSource, $uidOwner);
 	}
 
 	/**
@@ -356,25 +166,7 @@ class Share {
 	 * @return array | bool false will be returned in case the token is unknown or unauthorized
 	 */
 	public static function getShareByToken($token, $checkPasswordProtection = true) {
-		$query = \OC_DB::prepare('SELECT * FROM `*PREFIX*share` WHERE `token` = ?', 1);
-		$result = $query->execute(array($token));
-		if (\OC_DB::isError($result)) {
-			\OC_Log::write('OCP\Share', \OC_DB::getErrorMessage($result) . ', token=' . $token, \OC_Log::ERROR);
-		}
-		$row = $result->fetchRow();
-		if ($row === false) {
-			return false;
-		}
-		if (is_array($row) and self::expireItem($row)) {
-			return false;
-		}
-
-		// password protected shares need to be authenticated
-		if ($checkPasswordProtection && !\OCP\Share::checkPasswordProtectedShare($row)) {
-			return false;
-		}
-
-		return $row;
+		return \OC\Share\Share::getShareByToken($token, $checkPasswordProtection);
 	}
 
 	/**
@@ -382,21 +174,8 @@ class Share {
 	 * @param $linkItem
 	 * @return $fileOwner
 	 */
-	public static function resolveReShare($linkItem)
-	{
-		if (isset($linkItem['parent'])) {
-			$parent = $linkItem['parent'];
-			while (isset($parent)) {
-				$query = \OC_DB::prepare('SELECT * FROM `*PREFIX*share` WHERE `id` = ?', 1);
-				$item = $query->execute(array($parent))->fetchRow();
-				if (isset($item['parent'])) {
-					$parent = $item['parent'];
-				} else {
-					return $item;
-				}
-			}
-		}
-		return $linkItem;
+	public static function resolveReShare($linkItem) {
+		return \OC\Share\Share::resolveReShare($linkItem);
 	}
 
 
@@ -407,13 +186,12 @@ class Share {
 	 * @param mixed Parameters
 	 * @param int Number of items to return (optional) Returns all by default
 	 * @param bool include collections
-	 * @param string $itemType
 	 * @return Return depends on format
 	 */
 	public static function getItemsShared($itemType, $format = self::FORMAT_NONE, $parameters = null,
 		$limit = -1, $includeCollections = false) {
-		return self::getItems($itemType, null, null, null, \OC_User::getUser(), $format,
-			$parameters, $limit, $includeCollections);
+
+		return \OC\Share\Share::getItemsShared($itemType, $format, $parameters, $limit, $includeCollections);
 	}
 
 	/**
@@ -427,8 +205,8 @@ class Share {
 	 */
 	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, $includeCollections);
+
+		return \OC\Share\Share::getItemShared($itemType, $itemSource, $format, $parameters, $includeCollections);
 	}
 
 	/**
@@ -441,19 +219,7 @@ class Share {
 	 * @return Return array of users
 	 */
 	public static function getUsersItemShared($itemType, $itemSource, $uidOwner, $includeCollections = false, $checkExpireDate = true) {
-
-		$users = array();
-		$items = self::getItems($itemType, $itemSource, null, null, $uidOwner, self::FORMAT_NONE, null, -1, $includeCollections, false, $checkExpireDate);
-		if ($items) {
-			foreach ($items as $item) {
-				if ((int)$item['share_type'] === self::SHARE_TYPE_USER) {
-					$users[] = $item['share_with'];
-				} else if ((int)$item['share_type'] === self::SHARE_TYPE_GROUP) {
-					$users = array_merge($users, \OC_Group::usersInGroup($item['share_with']));
-				}
-			}
-		}
-		return $users;
+		return \OC\Share\Share::getUsersItemShared($itemType, $itemSource, $uidOwner, $includeCollections, $checkExpireDate);
 	}
 
 	/**
@@ -473,176 +239,7 @@ class Share {
 	 * @return bool|string Returns true on success or false on failure, Returns token on success for links
 	 */
 	public static function shareItem($itemType, $itemSource, $shareType, $shareWith, $permissions, $itemSourceName = null) {
-		$uidOwner = \OC_User::getUser();
-		$sharingPolicy = \OC_Appconfig::getValue('core', 'shareapi_share_policy', 'global');
-
-		if (is_null($itemSourceName)) {
-			$itemSourceName = $itemSource;
-		}
-
-		// Verify share type and sharing conditions are met
-		if ($shareType === self::SHARE_TYPE_USER) {
-			if ($shareWith == $uidOwner) {
-				$message = 'Sharing '.$itemSourceName.' 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)) {
-				$message = 'Sharing '.$itemSourceName.' failed, because the user '.$shareWith.' does not exist';
-				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
-				throw new \Exception($message);
-			}
-			if ($sharingPolicy == 'groups_only') {
-				$inGroup = array_intersect(\OC_Group::getUserGroups($uidOwner), \OC_Group::getUserGroups($shareWith));
-				if (empty($inGroup)) {
-					$message = 'Sharing '.$itemSourceName.' 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) {
-					$message = 'Sharing '.$itemSourceName.' 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)) {
-				$message = 'Sharing '.$itemSourceName.' failed, because the group '.$shareWith.' does not exist';
-				\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
-				throw new \Exception($message);
-			}
-			if ($sharingPolicy == 'groups_only' && !\OC_Group::inGroup($uidOwner, $shareWith)) {
-				$message = 'Sharing '.$itemSourceName.' 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) {
-					$message = 'Sharing '.$itemSourceName.' 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') {
-				// when updating a link share
-				if ($checkExists = self::getItems($itemType, $itemSource, self::SHARE_TYPE_LINK, null,
-					$uidOwner, self::FORMAT_NONE, null, 1)) {
-					// remember old token
-					$oldToken = $checkExists['token'];
-					$oldPermissions = $checkExists['permissions'];
-					//delete the old share
-					self::delete($checkExists['id']);
-				}
-
-				// 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', ''));
-				} else {
-					// reuse the already set password, but only if we change permissions
-					// otherwise the user disabled the password protection
-					if ($checkExists && (int)$permissions !== (int)$oldPermissions) {
-						$shareWith = $checkExists['share_with'];
-					}
-				}
-
-				// Generate token
-				if (isset($oldToken)) {
-					$token = $oldToken;
-				} else {
-					$token = \OC_Util::generateRandomBytes(self::TOKEN_LENGTH);
-				}
-				$result = self::put($itemType, $itemSource, $shareType, $shareWith, $uidOwner, $permissions,
-					null, $token, $itemSourceName);
-				if ($result) {
-					return $token;
-				} else {
-					return false;
-				}
-			}
-			$message = 'Sharing '.$itemSourceName.' 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 && $files = \OC\Files\Filesystem::getDirectoryContent($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'
-// 						&& $children = \OC\Files\Filesystem::getDirectoryContent($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, null, null, $itemSourceName);
-// 		}
+		return \OC\Share\Share::shareItem($itemType, $itemSource, $shareType, $shareWith, $permissions, $itemSourceName);
 	}
 
 	/**
@@ -651,88 +248,32 @@ class Share {
 	 * @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 boolean true on success or false on failure
+	 * @return Returns true on success or false on failure
 	 */
 	public static function unshare($itemType, $itemSource, $shareType, $shareWith) {
-		if ($item = self::getItems($itemType, $itemSource, $shareType, $shareWith, \OC_User::getUser(),
-			self::FORMAT_NONE, null, 1)) {
-			self::unshareItem($item);
-			return true;
-		}
-		return false;
+		return \OC\Share\Share::unshare($itemType, $itemSource, $shareType, $shareWith);
 	}
 
 	/**
 	 * Unshare an item from all users, groups, and remove all links
 	 * @param string Item type
 	 * @param string Item source
-	 * @param string $itemType
-	 * @param string $itemSource
-	 * @return boolean true on success or false on failure
+	 * @return Returns true on success or false on failure
 	 */
 	public static function unshareAll($itemType, $itemSource) {
-		// Get all of the owners of shares of this item.
-		$query = \OC_DB::prepare( 'SELECT `uid_owner` from `*PREFIX*share` WHERE `item_type`=? AND `item_source`=?' );
-		$result = $query->execute(array($itemType, $itemSource));
-		$shares = array();
-		// Add each owner's shares to the array of all shares for this item.
-		while ($row = $result->fetchRow()) {
-			$shares = array_merge($shares, self::getItems($itemType, $itemSource, null, null, $row['uid_owner']));
-		}
-		if (!empty($shares)) {
-			// Pass all the vars we have for now, they may be useful
-			$hookParams = array(
-				'itemType' => $itemType,
-				'itemSource' => $itemSource,
-				'shares' => $shares,
-			);
-			\OC_Hook::emit('OCP\Share', 'pre_unshareAll', $hookParams);
-			foreach ($shares as $share) {
-				self::unshareItem($share);
-			}
-			\OC_Hook::emit('OCP\Share', 'post_unshareAll', $hookParams);
-			return true;
-		}
-		return false;
+		return \OC\Share\Share::unshareAll($itemType, $itemSource);
 	}
 
 	/**
 	 * Unshare an item shared with the current user
 	 * @param string Item type
 	 * @param string Item target
-	 * @param string $itemType
-	 * @param string $itemTarget
-	 * @return boolean true on success or false on failure
+	 * @return Returns true on success or false on failure
 	 *
 	 * Unsharing from self is not allowed for items inside collections
 	 */
 	public static function unshareFromSelf($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($item['id']);
-			}
-			return true;
-		}
-		return false;
+		return \OC\Share\Share::unshareFromSelf($itemType, $itemTarget);
 	}
 	/**
 	 * sent status if users got informed by mail about share
@@ -742,102 +283,20 @@ class Share {
 	 * @param bool $status
 	 */
 	public static function setSendMailStatus($itemType, $itemSource, $shareType, $status) {
-		$status = $status ? 1 : 0;
-
-		$query = \OC_DB::prepare(
-				'UPDATE `*PREFIX*share`
-					SET `mail_send` = ?
-					WHERE `item_type` = ? AND `item_source` = ? AND `share_type` = ?');
-
-		$result = $query->execute(array($status, $itemType, $itemSource, $shareType));
-
-		if($result === false) {
-			\OC_Log::write('OCP\Share', 'Couldn\'t set send mail status', \OC_Log::ERROR);
-		}
+		return \OC\Share\Share::setSendMailStatus($itemType, $itemSource, $shareType, $status);
 	}
 
 	/**
 	 * Set the permissions of an item for a specific user or group
-	 * @param string $itemType Item type
-	 * @param string $itemSource Item source
-	 * @param int $shareType SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
-	 * @param string $shareWith User or group the item is being shared with
-	 * @param integer|null $permissions CRUDS
-	 * @return boolean true on success or false on failure
+	 * @param string Item type
+	 * @param string Item source
+	 * @param int SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
+	 * @param string User or group the item is being shared with
+	 * @param int CRUDS permissions
+	 * @return Returns true on success or false on failure
 	 */
 	public static function setPermissions($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, $item['id']));
-			if ($itemType === 'file' || $itemType === 'folder') {
-				\OC_Hook::emit('OCP\Share', 'post_update_permissions', array(
-					'itemType' => $itemType,
-					'itemSource' => $itemSource,
-					'shareType' => $shareType,
-					'shareWith' => $shareWith,
-					'uidOwner' => \OC_User::getUser(),
-					'permissions' => $permissions,
-					'path' => $item['path'],
-				));
-			}
-			// Check if permissions were removed
-			if ($item['permissions'] & ~$permissions) {
-				// If share permission is removed all reshares must be deleted
-				if (($item['permissions'] & PERMISSION_SHARE) && (~$permissions & PERMISSION_SHARE)) {
-					self::delete($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)."'";
-						// TODO this should be done with Doctrine platform objects
-						if (\OC_Config::getValue( "dbtype") === 'oci') {
-							$andOp = 'BITAND(`permissions`, ?)';
-						} else {
-							$andOp = '`permissions` & ?';
-						}
-						$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `permissions` = '.$andOp
-							.' 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);
+		return \OC\Share\Share::setPermissions($itemType, $itemSource, $shareType, $shareWith, $permissions);
 	}
 
 	/**
@@ -845,67 +304,10 @@ class Share {
 	 * @param string $itemType
 	 * @param string $itemSource
 	 * @param string $date expiration date
-	 * @return boolean
+	 * @return Share_Backend
 	 */
 	public static function setExpirationDate($itemType, $itemSource, $date) {
-		if ($items = self::getItems($itemType, $itemSource, null, null, \OC_User::getUser(),
-			self::FORMAT_NONE, null, -1, false)) {
-			if (!empty($items)) {
-				if ($date == '') {
-					$date = null;
-				} else {
-					$date = new \DateTime($date);
-				}
-				$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `expiration` = ? WHERE `id` = ?');
-				$query->bindValue(1, $date, 'datetime');
-				foreach ($items as $item) {
-					$query->bindValue(2, (int) $item['id']);
-					$query->execute();
-				}
-				return true;
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Checks whether a share has expired, calls unshareItem() if yes.
-	 * @param array $item Share data (usually database row)
-	 * @return bool True if item was expired, false otherwise.
-	 */
-	protected static function expireItem(array $item) {
-		if (!empty($item['expiration'])) {
-			$now = new \DateTime();
-			$expires = new \DateTime($item['expiration']);
-			if ($now > $expires) {
-				self::unshareItem($item);
-				return true;
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Unshares a share given a share data array
-	 * @param array $item Share data (usually database row)
-	 * @return null
-	 */
-	protected static function unshareItem(array $item) {
-		// Pass all the vars we have for now, they may be useful
-		$hookParams = array(
-			'itemType'      => $item['item_type'],
-			'itemSource'    => $item['item_source'],
-			'shareType'     => $item['share_type'],
-			'shareWith'     => $item['share_with'],
-			'itemParent'    => $item['parent'],
-			'uidOwner'      => $item['uid_owner'],
-		);
-
-		\OC_Hook::emit('OCP\Share', 'pre_unshare', $hookParams + array(
-			'fileSource'	=> $item['file_source'],
-		));
-		self::delete($item['id']);
-		\OC_Hook::emit('OCP\Share', 'post_unshare', $hookParams);
+		return \OC\Share\Share::setExpirationDate($itemType, $itemSource, $date);
 	}
 
 	/**
@@ -914,930 +316,14 @@ class Share {
 	 * @return Share_Backend
 	 */
 	public 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);
-	}
-
-	/**
-	 * Check if resharing is allowed
-	 * @return boolean true if allowed or false
-	 *
-	 * Resharing is allowed by default if not configured
-	 */
-	private static function isResharingAllowed() {
-		if (!isset(self::$isResharingAllowed)) {
-			if (\OC_Appconfig::getValue('core', 'shareapi_allow_resharing', 'yes') == 'yes') {
-				self::$isResharingAllowed = true;
-			} else {
-				self::$isResharingAllowed = false;
-			}
-		}
-		return self::$isResharingAllowed;
-	}
-
-	/**
-	 * 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[] = $type;
-			}
-		}
-		// TODO Add option for collections to be collection of themselves, only 'folder' does it now...
-		if (!self::getBackend($itemType) instanceof Share_Backend_Collection || $itemType != 'folder') {
-			unset($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;
-	}
-
-	/**
-	 * 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 $shareTypeGroupUserUnique
-	 * @param string User or group the item is being shared with
-	 * @param string User that is the owner of shared items (optional)
-	 * @param int Format to convert items to with formatItems()
-	 * @param mixed Parameters to pass to formatItems()
-	 * @param int Number of items to return, -1 to return all matches (optional)
-	 * @param bool Include collection item types (optional)
-	 * @param bool TODO (optional)
-	 * @prams bool check expire date
-	 * @return mixed
-	 *
-	 * See public functions getItem(s)... for parameter usage
-	 *
-	 */
-	private static function getItems($itemType, $item = null, $shareType = null, $shareWith = null,
-		$uidOwner = null, $format = self::FORMAT_NONE, $parameters = null, $limit = -1,
-		$includeCollections = false, $itemShareWithBySource = false, $checkExpireDate  = true) {
-		if (!self::isEnabled()) {
-			if ($limit == 1 || (isset($uidOwner) && isset($item))) {
-				return false;
-			} else {
-				return array();
-			}
-		}
-		$backend = self::getBackend($itemType);
-		$collectionTypes = false;
-		// Get filesystem root to add it to the file target and remove from the
-		// file source, match file_source with the file cache
-		if ($itemType == 'file' || $itemType == 'folder') {
-			if(!is_null($uidOwner)) {
-				$root = \OC\Files\Filesystem::getRoot();
-			} else {
-				$root = '';
-			}
-			$where = 'INNER JOIN `*PREFIX*filecache` ON `file_source` = `*PREFIX*filecache`.`fileid`';
-			if (!isset($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 (\OC_Appconfig::getValue('core', 'shareapi_allow_links', 'yes') !== 'yes') {
-			$where .= ' AND `share_type` != ?';
-			$queryArgs[] = self::SHARE_TYPE_LINK;
-		}
-		if (isset($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` = ?';
-					$item = \OC\Files\Filesystem::normalizePath($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`, `item_source`, `*PREFIX*share`.`parent`,'
-					.' `share_type`, `file_source`, `path`, `expiration`, `storage`, `share_with`, `mail_send`, `uid_owner`';
-			} else {
-				$select = '`id`, `item_type`, `item_source`, `parent`, `share_type`, `share_with`, `expiration`, `mail_send`, `uid_owner`';
-			}
-		} else {
-			if (isset($uidOwner)) {
-				if ($itemType == 'file' || $itemType == 'folder') {
-					$select = '`*PREFIX*share`.`id`, `item_type`, `item_source`, `*PREFIX*share`.`parent`,'
-						.' `share_type`, `share_with`, `file_source`, `path`, `permissions`, `stime`,'
-						.' `expiration`, `token`, `storage`, `mail_send`, `uid_owner`';
-				} else {
-					$select = '`id`, `item_type`, `item_source`, `parent`, `share_type`, `share_with`, `permissions`,'
-						.' `stime`, `file_source`, `expiration`, `token`, `mail_send`, `uid_owner`';
-				}
-			} else {
-				if ($fileDependent) {
-					if (($itemType == 'file' || $itemType == 'folder')
-						&& $format == \OC_Share_Backend_File::FORMAT_GET_FOLDER_CONTENTS
-						|| $format == \OC_Share_Backend_File::FORMAT_FILE_APP_ROOT
-					) {
-						$select = '`*PREFIX*share`.`id`, `item_type`, `item_source`, `*PREFIX*share`.`parent`, `uid_owner`, '
-							.'`share_type`, `share_with`, `file_source`, `path`, `file_target`, '
-							.'`permissions`, `expiration`, `storage`, `*PREFIX*filecache`.`parent` as `file_parent`, '
-							.'`name`, `mtime`, `mimetype`, `mimepart`, `size`, `unencrypted_size`, `encrypted`, `etag`, `mail_send`';
-					} 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`, `token`, `storage`, `mail_send`';
-					}
-				} else {
-					$select = '*';
-				}
-			}
-		}
-		$root = strlen($root);
-		$query = \OC_DB::prepare('SELECT '.$select.' FROM `*PREFIX*share` '.$where, $queryLimit);
-		$result = $query->execute($queryArgs);
-		if (\OC_DB::isError($result)) {
-			\OC_Log::write('OCP\Share',
-				\OC_DB::getErrorMessage($result) . ', select=' . $select . ' where=' . $where,
-				\OC_Log::ERROR);
-		}
-		$items = array();
-		$targets = array();
-		$switchedItems = array();
-		$mounts = array();
-		while ($row = $result->fetchRow()) {
-			if (isset($row['id'])) {
-				$row['id']=(int)$row['id'];
-			}
-			if (isset($row['share_type'])) {
-				$row['share_type']=(int)$row['share_type'];
-			}
-			if (isset($row['parent'])) {
-				$row['parent']=(int)$row['parent'];
-			}
-			if (isset($row['file_parent'])) {
-				$row['file_parent']=(int)$row['file_parent'];
-			}
-			if (isset($row['file_source'])) {
-				$row['file_source']=(int)$row['file_source'];
-			}
-			if (isset($row['permissions'])) {
-				$row['permissions']=(int)$row['permissions'];
-			}
-			if (isset($row['storage'])) {
-				$row['storage']=(int)$row['storage'];
-			}
-			if (isset($row['stime'])) {
-				$row['stime']=(int)$row['stime'];
-			}
-			// 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[$column]];
-					if (isset($items[$id]) && $items[$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[$id]['permissions'] & PERMISSION_SHARE
-							&& (int)$row['permissions'] & PERMISSION_SHARE) {
-							$items[$row['id']] = $items[$id];
-							$switchedItems[$id] = $row['id'];
-							unset($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'])) {
-					// FIXME: Doesn't always construct the correct path, example:
-					// Folder '/a/b', share '/a' and '/a/b' to user2
-					// user2 reshares /Shared/b and ask for share status of /Shared/a/b
-					// expected result: path=/Shared/a/b; actual result /Shared/b because of the parent
-					$query = \OC_DB::prepare('SELECT `file_target` FROM `*PREFIX*share` WHERE `id` = ?');
-					$parentResult = $query->execute(array($row['parent']));
-					if (\OC_DB::isError($result)) {
-						\OC_Log::write('OCP\Share', 'Can\'t select parent: ' .
-								\OC_DB::getErrorMessage($result) . ', select=' . $select . ' where=' . $where,
-								\OC_Log::ERROR);
-					} else {
-						$parentRow = $parentResult->fetchRow();
-						$tmpPath = '/Shared' . $parentRow['file_target'];
-						// find the right position where the row path continues from the target path
-						$pos = strrpos($row['path'], $parentRow['file_target']);
-						$subPath = substr($row['path'], $pos);
-						$splitPath = explode('/', $subPath);
-						foreach (array_slice($splitPath, 2) as $pathPart) {
-							$tmpPath = $tmpPath . '/' . $pathPart;
-						}
-						$row['path'] = $tmpPath;
-					}
-				} else {
-					if (!isset($mounts[$row['storage']])) {
-						$mountPoints = \OC\Files\Filesystem::getMountByNumericId($row['storage']);
-						if (is_array($mountPoints)) {
-							$mounts[$row['storage']] = current($mountPoints);
-						}
-					}
-					if ($mounts[$row['storage']]) {
-						$path = $mounts[$row['storage']]->getMountPoint().$row['path'];
-						$row['path'] = substr($path, $root);
-					}
-				}
-			}
-			if($checkExpireDate) {
-				if (self::expireItem($row)) {
-					continue;
-				}
-			}
-			// Check if resharing is allowed, if not remove share permission
-			if (isset($row['permissions']) && !self::isResharingAllowed()) {
-				$row['permissions'] &= ~PERMISSION_SHARE;
-			}
-			// Add display names to result
-			if ( isset($row['share_with']) && $row['share_with'] != '') {
-				$row['share_with_displayname'] = \OCP\User::getDisplayName($row['share_with']);
-			}
-			if ( isset($row['uid_owner']) && $row['uid_owner'] != '') {
-				$row['displayname_owner'] = \OCP\User::getDisplayName($row['uid_owner']);
-			}
-
-			$items[$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 && $row[$column] == $item && ($row['item_type'] == $itemType || $itemType == 'file')) {
-					if ($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 {
-										$meta = \OC\Files\Filesystem::getFileInfo($child['file_path']);
-										$childItem['file_source'] = $meta['fileid'];
-									}
-									$childItem['file_target'] =
-										\OC\Files\Filesystem::normalizePath($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
-					$toRemove = $row['id'];
-					if (array_key_exists($toRemove, $switchedItems)) {
-						$toRemove = $switchedItems[$toRemove];
-					}
-					unset($items[$toRemove]);
-				}
-			}
-			if (!empty($collectionItems)) {
-				$items = array_merge($items, $collectionItems);
-			}
-			if (empty($items) && $limit == 1) {
-				return false;
-			}
-			if ($format == self::FORMAT_NONE) {
-				return $items;
-			} else if ($format == self::FORMAT_STATUSES) {
-				$statuses = array();
-				foreach ($items as $item) {
-					if ($item['share_type'] == self::SHARE_TYPE_LINK) {
-						$statuses[$item[$column]]['link'] = true;
-					} else if (!isset($statuses[$item[$column]])) {
-						$statuses[$item[$column]]['link'] = false;
-					}
-					if ($itemType == 'file' || $itemType == 'folder') {
-						$statuses[$item[$column]]['path'] = $item['path'];
-					}
-				}
-				return $statuses;
-			} else {
-				return $backend->formatItems($items, $format, $parameters);
-			}
-		} else if ($limit == 1 || (isset($uidOwner) && isset($item))) {
-			return false;
-		}
-		return array();
-	}
-
-	/**
-	 * Put shared item into the database
-	 * @param string $itemType Item type
-	 * @param string $itemSource Item source
-	 * @param integer $shareType SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
-	 * @param string $shareWith User or group the item is being shared with
-	 * @param string $uidOwner User that is the owner of shared item
-	 * @param int $permissions CRUDS permissions
-	 * @param bool|array, $parentFolder Parent folder target (optional)
-	 * @param string $token (optional)
-	 * @param string $itemSourceName name of the source item (optional)
-	 * @return bool Returns true on success or false on failure
-	 */
-	private static function put($itemType, $itemSource, $shareType, $shareWith, $uidOwner,
-		$permissions, $parentFolder = null, $token = null, $itemSourceName = 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) {
-				$message = 'Sharing '.$itemSourceName.' 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 (self::isResharingAllowed() && (int)$checkReshare['permissions'] & PERMISSION_SHARE) {
-				if (~(int)$checkReshare['permissions'] & $permissions) {
-					$message = 'Sharing '.$itemSourceName
-						.' 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 {
-				$message = 'Sharing '.$itemSourceName.' 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 {
-					$meta = \OC\Files\Filesystem::getFileInfo($filePath);
-					$fileSource = $meta['fileid'];
-				}
-				if ($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;
-			}
-		}
-		$query = \OC_DB::prepare('INSERT INTO `*PREFIX*share` (`item_type`, `item_source`, `item_target`,'
-			.' `parent`, `share_type`, `share_with`, `uid_owner`, `permissions`, `stime`, `file_source`,'
-			.' `file_target`, `token`) VALUES (?,?,?,?,?,?,?,?,?,?,?,?)');
-		// Share with a group
-		if ($shareType == self::SHARE_TYPE_GROUP) {
-			$groupItemTarget = self::generateTarget($itemType, $itemSource, $shareType, $shareWith['group'],
-				$uidOwner, $suggestedItemTarget);
-			$run = true;
-			$error = '';
-			\OC_Hook::emit('OCP\Share', 'pre_shared', array(
-				'itemType' => $itemType,
-				'itemSource' => $itemSource,
-				'itemTarget' => $groupItemTarget,
-				'shareType' => $shareType,
-				'shareWith' => $shareWith['group'],
-				'uidOwner' => $uidOwner,
-				'permissions' => $permissions,
-				'fileSource' => $fileSource,
-				'token' => $token,
-				'run' => &$run,
-				'error' => &$error
-			));
-
-			if ($run === false) {
-				throw new \Exception($error);
-			}
-
-			if (isset($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, $token));
-			// 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, $token));
-					$id = \OC_DB::insertid('*PREFIX*share');
-				}
-			}
-			\OC_Hook::emit('OCP\Share', 'post_shared', array(
-				'itemType' => $itemType,
-				'itemSource' => $itemSource,
-				'itemTarget' => $groupItemTarget,
-				'parent' => $parent,
-				'shareType' => $shareType,
-				'shareWith' => $shareWith['group'],
-				'uidOwner' => $uidOwner,
-				'permissions' => $permissions,
-				'fileSource' => $fileSource,
-				'fileTarget' => $groupFileTarget,
-				'id' => $parent,
-				'token' => $token
-			));
-
-			if ($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);
-			$run = true;
-			$error = '';
-			\OC_Hook::emit('OCP\Share', 'pre_shared', array(
-				'itemType' => $itemType,
-				'itemSource' => $itemSource,
-				'itemTarget' => $itemTarget,
-				'shareType' => $shareType,
-				'shareWith' => $shareWith,
-				'uidOwner' => $uidOwner,
-				'permissions' => $permissions,
-				'fileSource' => $fileSource,
-				'token' => $token,
-				'run' => &$run,
-				'error' => &$error
-			));
-
-			if ($run === false) {
-				throw new \Exception($error);
-			}
-
-			if (isset($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, $token));
-			$id = \OC_DB::insertid('*PREFIX*share');
-			\OC_Hook::emit('OCP\Share', 'post_shared', array(
-				'itemType' => $itemType,
-				'itemSource' => $itemSource,
-				'itemTarget' => $itemTarget,
-				'parent' => $parent,
-				'shareType' => $shareType,
-				'shareWith' => $shareWith,
-				'uidOwner' => $uidOwner,
-				'permissions' => $permissions,
-				'fileSource' => $fileSource,
-				'fileTarget' => $fileTarget,
-				'id' => $id,
-				'token' => $token
-			));
-			if ($parentFolder === true) {
-				$parentFolders['id'] = $id;
-				// Return parent folder to preserve file target paths for potential children
-				return $parentFolders;
-			}
-		}
-		return true;
-	}
-
-	/**
-	 * 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 User that is the owner of shared item
-	 * @param string The suggested target originating from a reshare (optional)
-	 * @param int The id of the parent group share (optional)
-	 * @param integer $shareType
-	 * @return string Item target
-	 */
-	private static function generateTarget($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';
-				$columnSource = 'file_source';
-			} else {
-				$column = 'item_target';
-				$columnSource = 'item_source';
-			}
-			if ($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 $target;
-							} else {
-								continue;
-							}
-						}
-						if ($item['uid_owner'] == $uidOwner) {
-							if ($itemType == 'file' || $itemType == 'folder') {
-								$meta = \OC\Files\Filesystem::getFileInfo($itemSource);
-								if ($item['file_source'] == $meta['fileid']) {
-									return $target;
-								}
-							} else if ($item['item_source'] == $itemSource) {
-								return $target;
-							}
-						}
-					}
-					if (!isset($exclude)) {
-						$exclude = array();
-					}
-					// Find similar targets to improve backend's chances to generate a unqiue target
-					if ($userAndGroups) {
-						if ($column == 'file_target') {
-							$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
-								.' WHERE `item_type` IN (\'file\', \'folder\')'
-								.' AND `share_type` IN (?,?,?)'
-								.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')');
-							$result = $checkTargets->execute(array(self::SHARE_TYPE_USER, self::SHARE_TYPE_GROUP,
-								self::$shareTypeGroupUserUnique));
-						} else {
-							$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
-								.' WHERE `item_type` = ? AND `share_type` IN (?,?,?)'
-								.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')');
-							$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_USER,
-								self::SHARE_TYPE_GROUP, self::$shareTypeGroupUserUnique));
-						}
-					} else {
-						if ($column == 'file_target') {
-							$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
-								.' WHERE `item_type` IN (\'file\', \'folder\')'
-								.' AND `share_type` = ? AND `share_with` = ?');
-							$result = $checkTargets->execute(array(self::SHARE_TYPE_GROUP, $shareWith));
-						} else {
-							$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
-								.' WHERE `item_type` = ? AND `share_type` = ? AND `share_with` = ?');
-							$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_GROUP, $shareWith));
-						}
-					}
-					while ($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);
-	}
-
-	/**
-	 * 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)) {
-				$query = \OC_DB::prepare('SELECT `id`, `uid_owner`, `item_type`, `item_target`, `parent`'
-					.' FROM `*PREFIX*share` WHERE `parent` IN ('.$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'] & 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.')');
-			$query->execute();
-		}
+		return \OC\Share\Share::getBackend($itemType);
 	}
 
 	/**
 	 * Delete all shares with type SHARE_TYPE_LINK
 	 */
 	public static function removeAllLinkShares() {
-		// Delete any link shares
-		$query = \OC_DB::prepare('SELECT `id` FROM `*PREFIX*share` WHERE `share_type` = ?');
-		$result = $query->execute(array(self::SHARE_TYPE_LINK));
-		while ($item = $result->fetchRow()) {
-			self::delete($item['id']);
-		}
+		return \OC\Share\Share::removeAllLinkShares();
 	}
 
 	/**
@@ -1849,16 +335,7 @@ class Share {
 	 * @param array arguments
 	 */
 	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']);
-		}
+		return \OC\Share\Share::post_deleteUser($arguments);
 	}
 
 	/**
@@ -1867,33 +344,7 @@ class Share {
 	 * @param array arguments
 	 */
 	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'], $fileTarget));
-				\OC_DB::insertid('*PREFIX*share');
-			}
-		}
+		return \OC\Share\Share::post_addToGroup($arguments);
 	}
 
 	/**
@@ -1901,19 +352,7 @@ class Share {
 	 * @param array arguments
 	 */
 	public static function post_removeFromGroup($arguments) {
-		// TODO Don't call if user deleted?
-		$sql = 'SELECT `id`, `share_type` FROM `*PREFIX*share`'
-			.' WHERE (`share_type` = ? AND `share_with` = ?) OR (`share_type` = ? AND `share_with` = ?)';
-		$result = \OC_DB::executeAudited($sql, 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']);
-			}
-		}
+		return \OC\Share\Share::post_removeFromGroup($arguments);
 	}
 
 	/**
@@ -1921,11 +360,7 @@ class Share {
 	 * @param array arguments
 	 */
 	public static function post_deleteGroup($arguments) {
-		$sql = 'SELECT `id` FROM `*PREFIX*share` WHERE `share_type` = ? AND `share_with` = ?';
-		$result = \OC_DB::executeAudited($sql, array(self::SHARE_TYPE_GROUP, $arguments['gid']));
-		while ($item = $result->fetchRow()) {
-			self::delete($item['id']);
-		}
+		return \OC\Share\Share::post_deleteGroup($arguments);
 	}
 
 	/**
@@ -1935,26 +370,7 @@ class Share {
 	 * @return bool
 	 */
 	public static function checkPasswordProtectedShare(array $linkItem) {
-		if (!isset($linkItem['share_with'])) {
-			return true;
-		}
-		if (!isset($linkItem['share_type'])) {
-			return true;
-		}
-		if (!isset($linkItem['id'])) {
-			return true;
-		}
-
-		if ($linkItem['share_type'] != \OCP\Share::SHARE_TYPE_LINK) {
-			return true;
-		}
-
-		if ( \OC::$session->exists('public_link_authenticated')
-			&& \OC::$session->get('public_link_authenticated') === $linkItem['id'] ) {
-			return true;
-		}
-
-		return false;
+		return \OC\Share\Share::checkPasswordProtectedShare($linkItem);
 	}
 }
 
@@ -1967,9 +383,7 @@ interface Share_Backend {
 	 * Get the source of the item to be stored in the database
 	 * @param string Item source
 	 * @param string Owner of the item
-	 * @param string $itemSource
-	 * @param string $uidOwner
-	 * @return boolean Source
+	 * @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
@@ -1992,8 +406,8 @@ interface Share_Backend {
 
 	/**
 	 * Converts the shared item sources back into the item in the specified format
-	 * @param array $items Shared items
-	 * @param integer $format
+	 * @param array Shared items
+	 * @param int Format
 	 * @return TODO
 	 *
 	 * The items array is a 3-dimensional array with the item_source as the
@@ -2025,9 +439,6 @@ interface Share_Backend_File_Dependent extends Share_Backend {
 	 * Get the file path of the item
 	 * @param string Item source
 	 * @param string User that is the owner of shared item
-	 * @param string $itemSource
-	 * @param string $uidOwner
-	 * @return boolean
 	 */
 	public function getFilePath($itemSource, $uidOwner);