<?php
/**
 * @author Björn Schießle <bjoern@schiessle.org>
 * @author Joas Schilling <nickvergessen@owncloud.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin McCorkell <robin@mccorkell.me.uk>
 *
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

// 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;

/**
 * Interface that apps must implement to share content.
 * @since 5.0.0
 */
interface Share_Backend {

	/**
	 * Check if this $itemSource exist for the user
	 * @param string $itemSource
	 * @param string $uidOwner Owner of the item
	 * @return boolean|null Source
	 *
	 * Return false if the item does not exist for the user
	 * @since 5.0.0
	 */
	public function isValidSource($itemSource, $uidOwner);

	/**
	 * Get a unique name of the item for the specified user
	 * @param string $itemSource
	 * @param string|false $shareWith User the item is being shared with
	 * @param array|null $exclude List of similar item names already existing as shared items @deprecated since version OC7
	 * @return string Target name
	 *
	 * This function needs to verify that the user does not already have an item with this name.
	 * If it does generate a new name e.g. name_#
	 * @since 5.0.0
	 */
	public function generateTarget($itemSource, $shareWith, $exclude = null);

	/**
	 * Converts the shared item sources back into the item in the specified format
	 * @param array $items Shared items
	 * @param int $format
	 * @return array
	 *
	 * The items array is a 3-dimensional array with the item_source as the
	 * first key and the share id as the second key to an array with the share
	 * info.
	 *
	 * The key/value pairs included in the share info depend on the function originally called:
	 * If called by getItem(s)Shared: id, item_type, item, item_source,
	 * share_type, share_with, permissions, stime, file_source
	 *
	 * If called by getItem(s)SharedWith: id, item_type, item, item_source,
	 * item_target, share_type, share_with, permissions, stime, file_source,
	 * file_target
	 *
	 * This function allows the backend to control the output of shared items with custom formats.
	 * It is only called through calls to the public getItem(s)Shared(With) functions.
	 * @since 5.0.0
	 */
	public function formatItems($items, $format, $parameters = null);

	/**
	 * Check if a given share type is allowd by the back-end
	 *
	 * @param int $shareType share type
	 * @return boolean
	 *
	 * The back-end can enable/disable specific share types. Just return true if
	 * the back-end doesn't provide any specific settings for it and want to allow
	 * all share types defined by the share API
	 * @since 8.0.0
	 */
	public function isShareTypeAllowed($shareType);

}
