adding new mindforge applications

Mindforge.API/Middlewares/ExceptionHandlingMiddleware.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Mindforge.API.Exceptions;
+
+namespace Mindforge.API.Middlewares
+{
+    public class ExceptionHandlingMiddleware
+    {
+        private readonly RequestDelegate _next;
+        private readonly ILogger<ExceptionHandlingMiddleware> _logger;
+
+        public ExceptionHandlingMiddleware(RequestDelegate next, ILogger<ExceptionHandlingMiddleware> logger)
+        {
+            _next = next;
+            _logger = logger;
+        }
+
+        public async Task InvokeAsync(HttpContext context)
+        {
+            try
+            {
+                await _next(context);
+            }
+            catch (UserException ex)
+            {
+                _logger.LogWarning(ex, "User error");
+                await HandleExceptionAsync(context, StatusCodes.Status400BadRequest, ex.Message);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Internal server error");
+                await HandleExceptionAsync(context, StatusCodes.Status500InternalServerError, $"Internal server error: {ex.Message}");
+            }
+        }
+
+        private static Task HandleExceptionAsync(HttpContext context, int statusCode, string message)
+        {
+            context.Response.ContentType = "application/json";
+            context.Response.StatusCode = statusCode;
+
+            var result = JsonSerializer.Serialize(new { error = message });
+            return context.Response.WriteAsync(result);
+        }
+    }
+}