runAsync method

Implementation

@override
Future<void> runAsync(String label, List<String> args) async {
  if (args.length < 2) {
    server.log('Wrong usage, use ${getUsage()}', level: LogLevel.error);
    return;
  }
  final operations = {'list', 'add', 'remove', 'set'};
  final operation = operations.contains(args.first) ? args.first : 'set';
  final userReference = operation == 'set' && !operations.contains(args.first)
      ? args.first
      : args[1];
  final requestedRoles =
      operation == 'set' && !operations.contains(args.first)
      ? args.skip(1).toSet()
      : args.skip(2).toSet();
  final user = await server.userManager.getUserByReference(userReference);
  if (user == null) {
    server.log('User not found: $userReference', level: LogLevel.error);
    return;
  }
  if (operation == 'list') {
    if (args.length != 2) {
      server.log('Wrong usage, use ${getUsage()}', level: LogLevel.error);
      return;
    }
    server.log(
      '$userReference roles: ${user.roles.join(', ')}',
      level: LogLevel.info,
    );
    return;
  }
  if (requestedRoles.isEmpty ||
      requestedRoles.any(
        (role) => !server.configManager.serverRoles.containsKey(role),
      )) {
    server.log('Unknown or missing role.', level: LogLevel.error);
    return;
  }
  var roles = Set<String>.from(user.roles);
  switch (operation) {
    case 'add':
      roles.addAll(requestedRoles);
    case 'remove':
      if (requestedRoles.contains(kDefaultServerRole)) {
        server.log(
          'The default role $kDefaultServerRole cannot be removed.',
          level: LogLevel.error,
        );
        return;
      }
      roles.removeAll(requestedRoles);
    case 'set':
      roles = requestedRoles;
  }
  roles.add(kDefaultServerRole);
  if (!await server.userManager.changeRoles(userReference, roles)) return;
  await server.broadcastAllServerStates();
  server.log(
    'Changed $userReference roles to ${roles.join(', ')}',
    level: LogLevel.info,
  );
}