New: Use ASP.NET Core instead of Nancy

src/Radarr.Api.V3/Notifications/NotificationController.cs

@@ -0,0 +1,26 @@
+using NzbDrone.Core.Notifications;
+using Radarr.Http;
+
+namespace Radarr.Api.V3.Notifications
+{
+    [V3ApiController]
+    public class NotificationController : ProviderControllerBase<NotificationResource, INotification, NotificationDefinition>
+    {
+        public static readonly NotificationResourceMapper ResourceMapper = new NotificationResourceMapper();
+
+        public NotificationController(NotificationFactory notificationFactory)
+            : base(notificationFactory, "notification", ResourceMapper)
+        {
+        }
+
+        protected override void Validate(NotificationDefinition definition, bool includeWarnings)
+        {
+            if (!definition.OnGrab && !definition.OnDownload)
+            {
+                return;
+            }
+
+            base.Validate(definition, includeWarnings);
+        }
+    }
+}