owncloud / core

				}

			}

			// 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 %s failed, because this item is already shared with %s';

					$message_t = $l->t('Sharing %s failed, because this item is already shared with %s', array($itemSourceName, $shareWith));

					\OC_Log::write('OCP\Share', sprintf($message, $itemSourceName, $shareWith), \OC_Log::ERROR);

					throw new \Exception($message_t);

				}

			}

		} else if ($shareType === self::SHARE_TYPE_GROUP) {

			if (!\OC_Group::groupExists($shareWith)) {

				$message = 'Sharing %s failed, because the group %s does not exist';

			}

			// 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 %s failed, because this item is already shared with %s';

					$message_t = $l->t('Sharing %s failed, because this item is already shared with %s', array($itemSourceName, $shareWith));

					\OC_Log::write('OCP\Share', sprintf($message, $itemSourceName, $shareWith), \OC_Log::ERROR);

					throw new \Exception($message_t);

				}

			}

			// Convert share with into an array with the keys group and users

			$group = $shareWith;

			$shareWith = array();