nextcloud / server

		 * Check if file is not already shared with the remote user

		 */

		$alreadyShared = $this->getSharedWith($shareWith, self::SHARE_TYPE_REMOTE, $share->getNode(), 1, 0);

		if (!empty($alreadyShared)) {

			$message = 'Sharing %s failed, because this item is already shared with %s';

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

			$this->logger->debug(sprintf($message, $share->getNode()->getName(), $shareWith), ['app' => 'Federated File Sharing']);

			throw new \Exception($message_t);

		}

		// don't allow federated shares if source and target server are the same

		 * Check if file is not already shared with the remote user

		 */

		$alreadyShared = $this->getSharedWith($shareWith, \OCP\Share::SHARE_TYPE_EMAIL, $share->getNode(), 1, 0);

		if (!empty($alreadyShared)) {

			$message = 'Sharing %s failed, this item is already shared with %s';

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

			$this->logger->debug(sprintf($message, $share->getNode()->getName(), $shareWith), ['app' => 'Federated File Sharing']);

			throw new \Exception($message_t);

		}

		// if the admin enforces a password for all mail shares we create a

		// random password and send it to the recipient