DD.WellWorkover.Cloud/AsbCloudWebApi/Middlewares/SimplifyExceptionsMiddleware.cs

// Ignore Spelling: Middlewares
using AsbCloudApp.Exceptions;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace AsbCloudWebApi.Middlewares
{
    public class SimplifyExceptionsMiddleware
    {
        private readonly RequestDelegate next;

        public SimplifyExceptionsMiddleware(RequestDelegate next)
        {
            this.next = next;
        }

        public async Task InvokeAsync(HttpContext context)
        {
            try
            {
                await next.Invoke(context);
            }
            catch (ArgumentInvalidException ex)
            {
                Console.WriteLine($"ArgumentException in {context.Request.Method}: {ex.Message}");
                context.Response.Clear();
                context.Response.StatusCode = 400;
                context.Response.ContentType = "application/json";
                var body = MakeJsonBody(ex);
                await context.Response.WriteAsync(body);
            }
            catch (ForbidException ex)
            {
                Console.WriteLine($"ForbidException in {context.Request.Method}: {ex.Message}");
                context.Response.Clear();
                context.Response.StatusCode = 403;
            }
            catch (OperationCanceledException ex)
            {
                Console.WriteLine(ex.Message);
            }
            catch (Exception ex) // TODO: find explicit exception. Use Trace. Add body size to message.
            {
                context.Response.Clear();
                context.Response.StatusCode = 500;
                
                if (ex.Message.Contains("Reading the request body timed out due to data arriving too slowly. See MinRequestBodyDataRate."))
                    Console.WriteLine("Reading the request body timed out due to data arriving too slowly.");
                else
                    throw;
            }
        }

        private static string MakeJsonBody(ArgumentInvalidException ex)
        {
            var errors = new Dictionary<string, string[]>() {
                { string.Join(", ", ex.ParamsNames), new[]{ ex.Message } }
            };
            var problem = new ValidationProblemDetails(errors);
            var buffer = System.Text.Json.JsonSerializer.Serialize(problem);
            return buffer;
        }
    }
}