From 9233b45966ac1f6b97533902b51b5a1f7145f59e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=A4=D1=80=D0=BE=D0=BB=D0=BE=D0=B2?=
 <nikita.grigorevich@gmail.com>
Date: Thu, 23 Dec 2021 17:15:05 +0500
Subject: [PATCH] Handle ArgumentException in SimplifyExceptionsMiddleware. It
 replaces StatusCode 500 (server error) to StatusCode  400 (bad request)

---
 .../Middlewares/SimplifyExceptionsMiddleware.cs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/AsbCloudWebApi/Middlewares/SimplifyExceptionsMiddleware.cs b/AsbCloudWebApi/Middlewares/SimplifyExceptionsMiddleware.cs
index deae400d..667f1946 100644
--- a/AsbCloudWebApi/Middlewares/SimplifyExceptionsMiddleware.cs
+++ b/AsbCloudWebApi/Middlewares/SimplifyExceptionsMiddleware.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Http;
 using System;
+using System.IO;
 using System.Threading.Tasks;
 
 namespace AsbCloudWebApi.Middlewares
@@ -19,6 +20,15 @@ namespace AsbCloudWebApi.Middlewares
             {
                 await next?.Invoke(context);
             }
+            catch(ArgumentException 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 (TaskCanceledException ex)
             {
                 Console.WriteLine(ex.Message);
@@ -31,5 +41,12 @@ namespace AsbCloudWebApi.Middlewares
                     throw;
             }
         }
+
+        private string MakeJsonBody(ArgumentException ex)
+        {
+            object error = new { name = ex.ParamName, errors = new string[] { ex.Message } };
+            var buffer = System.Text.Json.JsonSerializer.Serialize(error);
+            return buffer;
+        }
     }
 }