refacto error handling

src/Yavsc.Org/Helpers/ErrorViewHelpers.cs

@@ -0,0 +1,52 @@
+using Microsoft.AspNetCore.Mvc;
+using Yavsc.Models;
+
+public static class ErrorViewHelpers
+{
+    public static IActionResult ErrorView<T>(this Controller controller, string message)
+    {
+        var logger = controller.HttpContext.RequestServices.GetRequiredService<ILoggerFactory>()
+            .CreateLogger<T>();
+        
+        logger.LogError(message);
+        Dictionary<string, string> dictionary = new Dictionary<string, string>();
+        
+        if  (!controller.ModelState.IsValid)
+        {
+            foreach (var modelState in controller.ModelState.Values)
+            {
+                foreach (var error in modelState.Errors)
+                {
+                    logger.LogError("ModelState error: {0}", error.ErrorMessage);
+                    foreach (var key in controller.ModelState.Keys)
+                    {
+                        logger.LogError("ModelState key: {0}", key);
+                        dictionary.Add(key, 
+                        string.Join("\n", 
+                        controller.ModelState[key].Errors.Select( e => e.ErrorMessage).ToArray()));
+                    }
+                }
+            }
+        }
+
+        if (controller.HttpContext.Request.Headers.ContainsKey("Accept")
+         && controller.HttpContext.Request.Headers["Accept"].ToString().Contains("application/json"))
+        {
+            return controller.Json(new
+            {
+                RequestId = controller.HttpContext.TraceIdentifier,
+                Description = message,
+                ModelErrors = dictionary
+            });
+        }
+
+        return controller.View("Error",
+            new ErrorViewModel
+            {
+                RequestId = controller.HttpContext.TraceIdentifier,
+                Description = message,
+                ModelErrors = dictionary
+            }
+        );
+    }
+}