feat:Initial commit

StoreService/Middleware/ErrorHandlingMiddleware.cs

@@ -0,0 +1,79 @@
+using System.Net;
+using System.Text.Json;
+using System.ComponentModel.DataAnnotations;
+
+namespace StoreService.Middleware;
+
+/// <summary>
+/// Global error handling middleware capturing unhandled exceptions and returning structured JSON errors.
+/// </summary>
+public class ErrorHandlingMiddleware
+{
+    #region Fields
+    private readonly RequestDelegate _next;
+    private readonly ILogger _logger;
+    #endregion
+
+    #region Ctor
+    public ErrorHandlingMiddleware(RequestDelegate next, ILogger<ErrorHandlingMiddleware > logger)
+    {
+        _next = next;
+        _logger = logger;
+    }
+    #endregion
+
+    #region Invoke
+    public async Task InvokeAsync(HttpContext context)
+    {
+        try
+        {
+            await _next(context);
+        }
+        catch (Exception ex)
+        {
+            await HandleExceptionAsync(context, ex);
+        }
+    }
+    #endregion
+
+    #region Helpers
+    private async Task HandleExceptionAsync(HttpContext context, Exception ex)
+    {
+        var status = ex switch
+        {
+            ValidationException => (int)HttpStatusCode.BadRequest,
+            ArgumentException => (int)HttpStatusCode.BadRequest,
+            KeyNotFoundException => (int)HttpStatusCode.NotFound,
+            InvalidOperationException => StatusCodes.Status409Conflict,
+            _ => (int)HttpStatusCode.InternalServerError
+        };
+
+        var errorId = Guid.NewGuid().ToString();
+        if (status >= 500)
+        {
+            _logger.LogError(ex, "Unhandled server exception {ErrorId}", errorId);
+        }
+        else
+        {
+            _logger.LogWarning(ex, "Handled domain exception {ErrorId} -> {Status}", errorId, status);
+        }
+
+        var env = context.RequestServices.GetRequiredService<IHostEnvironment>();
+
+        var problem = new
+        {
+            traceId = context.TraceIdentifier,
+            errorId,
+            status,
+            message = ex.Message,
+            details = env.IsDevelopment() ? ex.StackTrace : null
+        };
+
+        context.Response.ContentType = "application/json";
+        context.Response.StatusCode = status;
+        await context.Response.WriteAsync(JsonSerializer.Serialize(problem));
+    }
+    #endregion
+}
+
+