Middleware createMiddleware()

in lib/src/middleware.dart [49:75]

• 24 lines of code
• 4 McCabe index (conditional complexity)

Middleware createMiddleware({
  FutureOr<Response?> Function(Request)? requestHandler,
  FutureOr<Response> Function(Response)? responseHandler,
  FutureOr<Response> Function(Object error, StackTrace)? errorHandler,
}) {
  requestHandler ??= (request) => null;
  responseHandler ??= (response) => response;

  FutureOr<Response> Function(Object, StackTrace)? onError;
  if (errorHandler != null) {
    onError = (error, stackTrace) {
      if (error is HijackException) throw error;
      return errorHandler(error, stackTrace);
    };
  }

  return (Handler innerHandler) {
    return (request) {
      return Future.sync(() => requestHandler!(request)).then((response) {
        if (response != null) return response;

        return Future.sync(() => innerHandler(request))
            .then((response) => responseHandler!(response), onError: onError);
      });
    };
  };
}