feat(ExceptionHandlingMiddleware): add middleware to handle error

src/DigitalData.UserManager.API/Middleware/ExceptionHandlingMiddleware.cs

@@ -0,0 +1,84 @@
+using DigitalData.Core.Exceptions;
+using System.Net;
+using System.Text.Json;
+
+namespace DigitalData.UserManager.API.Middleware;
+
+//TODO: Fix and use DigitalData.Core.Exceptions.Middleware
+/// <summary>
+/// Middleware for handling exceptions globally in the application.
+/// Captures exceptions thrown during the request pipeline execution,
+/// logs them, and returns an appropriate HTTP response with a JSON error message.
+/// </summary>
+[Obsolete("Use DigitalData.Core.Exceptions.Middleware")]
+public class ExceptionHandlingMiddleware
+{
+    private readonly RequestDelegate _next;
+    private readonly ILogger<ExceptionHandlingMiddleware> _logger;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ExceptionHandlingMiddleware"/> class.
+    /// </summary>
+    /// <param name="next">The next middleware in the request pipeline.</param>
+    /// <param name="logger">The logger instance for logging exceptions.</param>
+    public ExceptionHandlingMiddleware(RequestDelegate next, ILogger<ExceptionHandlingMiddleware> logger)
+    {
+        _next = next;
+        _logger = logger;
+    }
+
+    /// <summary>
+    /// Invokes the middleware to handle the HTTP request.
+    /// </summary>
+    /// <param name="context">The HTTP context of the current request.</param>
+    /// <returns>A task that represents the asynchronous operation.</returns>
+    public async Task InvokeAsync(HttpContext context)
+    {
+        try
+        {
+            await _next(context); // Continue down the pipeline
+        }
+        catch (Exception ex)
+        {
+            await HandleExceptionAsync(context, ex, _logger);
+        }
+    }
+
+    /// <summary>
+    /// Handles exceptions by logging them and writing an appropriate JSON response.
+    /// </summary>
+    /// <param name="context">The HTTP context of the current request.</param>
+    /// <param name="exception">The exception that occurred.</param>
+    /// <param name="logger">The logger instance for logging the exception.</param>
+    /// <returns>A task that represents the asynchronous operation.</returns>
+    private static async Task HandleExceptionAsync(HttpContext context, Exception exception, ILogger logger)
+    {
+        context.Response.ContentType = "application/json";
+
+        string message;
+
+        switch (exception)
+        {
+            case BadRequestException badRequestEx:
+                context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
+                message = badRequestEx.Message;
+                break;
+
+            case NotFoundException notFoundEx:
+                context.Response.StatusCode = (int)HttpStatusCode.NotFound;
+                message = notFoundEx.Message;
+                break;
+
+            default:
+                logger.LogError(exception, "Unhandled exception occurred.");
+                context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
+                message = "An unexpected error occurred.";
+                break;
+        }
+
+        await context.Response.WriteAsync(JsonSerializer.Serialize(new
+        {
+            message
+        }));
+    }
+}

src/DigitalData.UserManager.API/Program.cs

@@ -1,23 +1,24 @@
-using Microsoft.EntityFrameworkCore;
-using DigitalData.UserManager.Application;
-using DigitalData.Core.Application;
-using NLog.Web;
-using NLog;
-using DigitalData.Core.API;
-using DigitalData.UserManager.API.Controllers;
-using DigitalData.UserManager.Application.Services;
-using Microsoft.Data.SqlClient;
-using Newtonsoft.Json;
-using Microsoft.IdentityModel.Tokens;
-using DigitalData.UserManager.Application.DTOs.User;
-using DigitalData.UserManager.API.Models;
 using DigitalData.Auth.Client;
-using DigitalData.UserManager.API;
-using Microsoft.AspNetCore.Authentication.JwtBearer;
-using Microsoft.Extensions.Options;
 using DigitalData.Core.Abstractions.Security.Extensions;
-using Microsoft.OpenApi.Models;
+using DigitalData.Core.API;
+using DigitalData.Core.Application;
+using DigitalData.UserManager.API;
+using DigitalData.UserManager.API.Controllers;
+using DigitalData.UserManager.API.Middleware;
+using DigitalData.UserManager.API.Models;
+using DigitalData.UserManager.Application;
+using DigitalData.UserManager.Application.DTOs.User;
+using DigitalData.UserManager.Application.Services;
 using DigitalData.UserManager.DependencyInjection;
+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.Data.SqlClient;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using Microsoft.IdentityModel.Tokens;
+using Microsoft.OpenApi.Models;
+using Newtonsoft.Json;
+using NLog;
+using NLog.Web;
 
 var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
 logger.Debug("init main");
@@ -170,6 +171,8 @@ try {
         return dCnnStr;
     });
 
+    app.UseMiddleware<ExceptionHandlingMiddleware>();
+
     app.UseCors("DefaultCorsPolicy");
 
     if (builder.Configuration.GetValue<bool>("UseSwagger"))