<?php
  /**

   * ownCloud
   *

   * @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
   * 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 for apps to use.
   * Share Class
   *
   */
  
  // 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 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.
   *
   * It provides the following hooks:
   *  - post_shared
   */

  class Share extends \OC\Share\Constants {

  
  	/**

  	 * Register a sharing backend class that implements OCP\Share_Backend for an item type

  	 * @param string $itemType Item type
  	 * @param string $class Backend class
  	 * @param string $collectionOf (optional) Depends on item type
  	 * @param array $supportedFileExtensions (optional) List of supported file extensions if this item type depends on files
  	 * @return boolean true if backend is registered or false if error

  	 */

  	public static function registerBackend($itemType, $class, $collectionOf = null, $supportedFileExtensions = null) {

  		return \OC\Share\Share::registerBackend($itemType, $class, $collectionOf, $supportedFileExtensions);

  	}
  
  	/**

  	 * Check if the Share API is enabled

  	 * @return boolean true if enabled or false

  	 *
  	 * The Share API is enabled by default if not configured
  	 */

  	public static function isEnabled() {

  		return \OC\Share\Share::isEnabled();

  	}
  
  	/**

  	 * Find which users can access a shared item

  	 * @param string $path to the file
  	 * @param string $ownerUser owner of the file
  	 * @param bool $includeOwner include owner to the list of users with access to the file
  	 * @param bool $returnUserPaths Return an array with the user => path map

  	 * @return array
  	 * @note $path needs to be relative to user data dir, e.g. 'file.txt'
  	 *       not '/admin/data/file.txt'
  	 */

  	public static function getUsersSharingFile($path, $ownerUser, $includeOwner = false, $returnUserPaths = false) {
  		return \OC\Share\Share::getUsersSharingFile($path, $ownerUser, $includeOwner, $returnUserPaths);

  	}
  
  	/**

  	 * Get the items of item type shared with the current user

  	 * @param string $itemType
  	 * @param int $format (optional) Format type must be defined by the backend
  	 * @param mixed $parameters (optional)
  	 * @param int $limit Number of items to return (optional) Returns all by default
  	 * @param bool $includeCollections (optional)
  	 * @return mixed Return depends on format

  	 */

  	public static function getItemsSharedWith($itemType, $format = self::FORMAT_NONE,
  		$parameters = null, $limit = -1, $includeCollections = false) {

  
  		return \OC\Share\Share::getItemsSharedWith($itemType, $format, $parameters, $limit, $includeCollections);
  	}
  
  	/**
  	 * Get the items of item type shared with a user
  	 * @param string $itemType
  	 * @param string $user for which user we want the shares
  	 * @param int $format (optional) Format type must be defined by the backend
  	 * @param mixed $parameters (optional)
  	 * @param int $limit Number of items to return (optional) Returns all by default
  	 * @param bool $includeCollections (optional)
  	 * @return mixed Return depends on format
  	 */
  	public static function getItemsSharedWithUser($itemType, $user, $format = self::FORMAT_NONE,
  		$parameters = null, $limit = -1, $includeCollections = false) {
  
  		return \OC\Share\Share::getItemsSharedWithUser($itemType, $user, $format, $parameters, $limit, $includeCollections);

  	}
  
  	/**

  	 * Get the item of item type shared with the current user
  	 * @param string $itemType
  	 * @param string $itemTarget
  	 * @param int $format (optional) Format type must be defined by the backend

  	 * @param mixed $parameters (optional)
  	 * @param bool $includeCollections (optional)
  	 * @return mixed Return depends on format

  	 */

  	public static function getItemSharedWith($itemType, $itemTarget, $format = self::FORMAT_NONE,
  		$parameters = null, $includeCollections = false) {

  
  		return \OC\Share\Share::getItemSharedWith($itemType, $itemTarget, $format, $parameters, $includeCollections);

  	}
  
  	/**

  	 * Get the item of item type shared with a given user by source
  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @param string $user User user to whom the item was shared
  	 * @return array Return list of items with file_target, permissions and expiration
  	 */
  	public static function getItemSharedWithUser($itemType, $itemSource, $user) {

  		return \OC\Share\Share::getItemSharedWithUser($itemType, $itemSource, $user);

  	}
  
  	/**
  	 * Get the item of item type shared with the current user by source

  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @param int $format (optional) Format type must be defined by the backend
  	 * @param mixed $parameters
  	 * @param bool $includeCollections
  	 * @return mixed Return depends on format

  	 */

  	public static function getItemSharedWithBySource($itemType, $itemSource, $format = self::FORMAT_NONE,
  		$parameters = null, $includeCollections = false) {

  		return \OC\Share\Share::getItemSharedWithBySource($itemType, $itemSource, $format, $parameters, $includeCollections);

  	}
  
  	/**

  	 * Get the item of item type shared by a link

  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @param string $uidOwner Owner of link

  	 * @return Item
  	 */

  	public static function getItemSharedWithByLink($itemType, $itemSource, $uidOwner) {

  		return \OC\Share\Share::getItemSharedWithByLink($itemType, $itemSource, $uidOwner);

  	}
  
  	/**

  	 * Based on the given token the share information will be returned - password protected shares will be verified
  	 * @param string $token

  	 * @return array|bool false will be returned in case the token is unknown or unauthorized

  	 */

  	public static function getShareByToken($token, $checkPasswordProtection = true) {

  		return \OC\Share\Share::getShareByToken($token, $checkPasswordProtection);

  	}
  
  	/**

  	 * resolves reshares down to the last real share

  	 * @param array $linkItem
  	 * @return array file owner

  	 */

  	public static function resolveReShare($linkItem) {
  		return \OC\Share\Share::resolveReShare($linkItem);

  	}
  
  
  	/**

  	 * Get the shared items of item type owned by the current user

  	 * @param string $itemType
  	 * @param int $format (optional) Format type must be defined by the backend
  	 * @param mixed $parameters
  	 * @param int $limit Number of items to return (optional) Returns all by default
  	 * @param bool $includeCollections
  	 * @return mixed Return depends on format

  	 */

  	public static function getItemsShared($itemType, $format = self::FORMAT_NONE, $parameters = null,
  		$limit = -1, $includeCollections = false) {

  
  		return \OC\Share\Share::getItemsShared($itemType, $format, $parameters, $limit, $includeCollections);

  	}
  
  	/**

  	 * Get the shared item of item type owned by the current user

  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @param int $format (optional) Format type must be defined by the backend
  	 * @param mixed $parameters
  	 * @param bool $includeCollections
  	 * @return mixed Return depends on format

  	 */

  	public static function getItemShared($itemType, $itemSource, $format = self::FORMAT_NONE,
  	                                     $parameters = null, $includeCollections = false) {

  
  		return \OC\Share\Share::getItemShared($itemType, $itemSource, $format, $parameters, $includeCollections);

  	}
  
  	/**

  	 * Get all users an item is shared with

  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @param string $uidOwner
  	 * @param bool $includeCollections
  	 * @param bool $checkExpireDate
  	 * @return array Return array of users

  	 */
  	public static function getUsersItemShared($itemType, $itemSource, $uidOwner, $includeCollections = false, $checkExpireDate = true) {

  		return \OC\Share\Share::getUsersItemShared($itemType, $itemSource, $uidOwner, $includeCollections, $checkExpireDate);

  	}
  
  	/**

  	 * Share an item with a user, group, or via private link
  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @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 int $permissions CRUDS

  	 * @param string $itemSourceName
  	 * @param \DateTime $expirationDate

  	 * @return bool|string Returns true on success or false on failure, Returns token on success for links

  	 * @throws \Exception

  	 */

  	public static function shareItem($itemType, $itemSource, $shareType, $shareWith, $permissions, $itemSourceName = null, \DateTime $expirationDate = null) {
  		return \OC\Share\Share::shareItem($itemType, $itemSource, $shareType, $shareWith, $permissions, $itemSourceName, $expirationDate);

  	}
  
  	/**

  	 * Unshare an item from a user, group, or delete a private link

  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @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
  	 * @return boolean true on success or false on failure

  	 */

  	public static function unshare($itemType, $itemSource, $shareType, $shareWith) {

  		return \OC\Share\Share::unshare($itemType, $itemSource, $shareType, $shareWith);

  	}
  
  	/**

  	 * Unshare an item from all users, groups, and remove all links

  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @return boolean true on success or false on failure

  	 */

  	public static function unshareAll($itemType, $itemSource) {

  		return \OC\Share\Share::unshareAll($itemType, $itemSource);

  	}
  
  	/**

  	 * Unshare an item shared with the current user

  	 * @param string $itemType
  	 * @param string $itemTarget
  	 * @return boolean true on success or false on failure

  	 *
  	 * Unsharing from self is not allowed for items inside collections
  	 */

  	public static function unshareFromSelf($itemType, $itemTarget) {

  		return \OC\Share\Share::unshareFromSelf($itemType, $itemTarget);

  	}

  	/**
  	 * sent status if users got informed by mail about share
  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @param int $shareType SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
  	 * @param bool $status
  	 */
  	public static function setSendMailStatus($itemType, $itemSource, $shareType, $status) {

  		return \OC\Share\Share::setSendMailStatus($itemType, $itemSource, $shareType, $status);

  	}

  
  	/**

  	 * Set the permissions of an item for a specific user or group

  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @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 int $permissions CRUDS permissions
  	 * @return boolean true on success or false on failure

  	 */

  	public static function setPermissions($itemType, $itemSource, $shareType, $shareWith, $permissions) {

  		return \OC\Share\Share::setPermissions($itemType, $itemSource, $shareType, $shareWith, $permissions);

  	}

  	/**
  	 * Set expiration date for a share
  	 * @param string $itemType
  	 * @param string $itemSource
  	 * @param string $date expiration date

  	 * @param int $shareTime timestamp from when the file was shared
  	 * @return boolean

  	 */

  	public static function setExpirationDate($itemType, $itemSource, $date, $shareTime = null) {
  		return \OC\Share\Share::setExpirationDate($itemType, $itemSource, $date, $shareTime);

  	}
  
  	/**
  	 * Get the backend class for the specified item type
  	 * @param string $itemType
  	 * @return Share_Backend
  	 */

  	public static function getBackend($itemType) {

  		return \OC\Share\Share::getBackend($itemType);

  	}
  
  	/**

  	 * Delete all shares with type SHARE_TYPE_LINK
  	 */
  	public static function removeAllLinkShares() {

  		return \OC\Share\Share::removeAllLinkShares();

  	}

  	/**
  	 * In case a password protected link is not yet authenticated this function will return false
  	 *
  	 * @param array $linkItem
  	 * @return bool
  	 */
  	public static function checkPasswordProtectedShare(array $linkItem) {

  		return \OC\Share\Share::checkPasswordProtectedShare($linkItem);

  	}

  }
  
  /**

   * Interface that apps must implement to share content.
   */

  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

  	 */

  	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

  	 * @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);
  
  	/**

  	 * Converts the shared item sources back into the item in the specified format

  	 * @param array $items Shared items
  	 * @param int $format

  	 * @return TODO
  	 *
  	 * 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 {
  
  	/**

  	 * Get the file path of the item

  	 * @param string $itemSource
  	 * @param string $uidOwner User that is the owner of shared item
  	 * @return string|false

  	 */

  	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 {
  
  	/**

  	 * Get the sources of the children of the item

  	 * @param string $itemSource

  	 * @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);
  
  }