diff --git a/apps/contacts/lib/share/addressbook.php b/apps/contacts/lib/share/addressbook.php
new file mode 100644
index 0000000000..9e353453f3
--- /dev/null
+++ b/apps/contacts/lib/share/addressbook.php
@@ -0,0 +1,88 @@
+<?php
+/**
+ * Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+class OC_Share_Backend_Addressbook implements OCP\Share_Backend_Collection {
+	const FORMAT_ADDRESSBOOKS = 1;
+	/**
+	* @brief Get the source of the item to be stored in the database
+	* @param string Item
+	* @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($item, $uid) {
+		$addressbook = OC_Contacts_Addressbook::find( $item );
+		if( $addressbook === false || $addressbook['userid'] != $uid) {
+			return false;
+		}
+		return true;
+	}
+
+	/**
+	* @brief Get a unique name of the item for the specified user
+	* @param string Item
+	* @param string|false User the item is being shared with
+	* @param array|null List of similar item names already existing as shared items
+	* @return string Target name
+	*
+	* This function needs to verify that the user does not already have an item with this name.
+	* If it does generate a new name e.g. name_#
+	*/
+	public function generateTarget($item, $uid, $exclude = null) {
+		$addressbook = OC_Contacts_Addressbook::find( $item );
+		$user_addressbooks = array();
+		foreach(OC_Contacts_Addressbook::all($uid) as $user_addressbook) {
+			$user_addressbooks[] = $user_addressbook['displayname'];
+		}
+		$name = $addressbook['userid']."'s ".$addressbook['displayname'];
+		$suffix = '';
+		while (in_array($name.$suffix, $user_addressbooks)) {
+			$suffix++;
+		}
+		
+		return $name.$suffix;
+	}
+
+	/**
+	* @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) {
+		$addressbooks = array();
+		foreach ($items as $item) {
+			$addressbook = OC_Contacts_Addressbook::find($item['item_source']);
+			$addressbook['displayname'] = $item['item_target'];
+			$addressbooks[] = $addressbook;
+		}
+		return $addressbooks;
+	}
+
+	public function getChildren($item) {
+		$query = OCP\DB::prepare('SELECT id FROM *PREFIX*contacts_cards WHERE addressbookid = ?');
+		$result = $query->execute(array($item));
+		$sources = array();
+		while ($contact = $result->fetchRow()) {
+			$sources[] = $contact['id'];
+		}
+		return $sources;
+	}
+
+}
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diff --git a/apps/contacts/lib/share/contact.php b/apps/contacts/lib/share/contact.php
new file mode 100644
index 0000000000..718c8f9025
--- /dev/null
+++ b/apps/contacts/lib/share/contact.php
@@ -0,0 +1,53 @@
+<?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/>.
+*/
+
+class OC_Share_Backend_Contact implements OCP\Share_Backend {
+
+	const FORMAT_CONTACT = 0;
+
+	private static $contact;
+
+	public function isValidSource($itemSource, $uidOwner) {
+		self::$contact = OC_Contacts_VCard::find($itemSource);
+		if (self::$contact) {
+			return true;
+		}
+		return false;
+	}
+	
+	public function generateTarget($itemSource, $shareWith, $exclude = null) {
+		// TODO Get default addressbook and check for conflicts
+		return self::$contact['fullname'];
+	}
+	
+	public function formatItems($items, $format, $parameters = null) {
+		$contacts = array();
+		if ($format == self::FORMAT_CONTACT) {
+			foreach ($items as $item) {
+				$contact = OC_Contacts_VCard::find($item['item_source']);
+				$contact['fullname'] = $item['item_target'];
+				$contacts[] = $contact;
+			}
+		}
+		return $contacts;
+	}
+
+}
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