extract method

Implementation

@override
Future<Result<T, Rejection>> extract(Request request) async {
  final raw = pathParametersOf(request)[key];
  if (raw == null) {
    return Err(Rejection.badRequest('path parameter "$key" is missing'));
  }

  final String decoded;
  try {
    decoded = Uri.decodeComponent(raw);
  } on ArgumentError {
    return Err(
      Rejection.badRequest(
        'path parameter "$key" is not valid percent-encoding',
      ),
    );
  }

  return coerce<T>(decoded, source: 'path parameter "$key"');
}