Server connectivity for calendar and some abstraction for server.

Wino.Calendar/App.xaml.cs

@@ -1,7 +1,12 @@
 using System;
 using System.Collections.Generic;
+using CommunityToolkit.Mvvm.Messaging;
 using Microsoft.Extensions.DependencyInjection;
+using Serilog;
+using Windows.ApplicationModel;
 using Windows.ApplicationModel.Activation;
+using Windows.ApplicationModel.AppService;
+using Windows.ApplicationModel.Background;
 using Windows.UI.Core.Preview;
 using Wino.Activation;
 using Wino.Calendar.Activation;
@@ -10,16 +15,23 @@ using Wino.Calendar.ViewModels;
 using Wino.Core;
 using Wino.Core.Domain.Interfaces;
 using Wino.Core.UWP;
+using Wino.Messaging.Client.Connection;
+using Wino.Messaging.Server;
 
 namespace Wino.Calendar
 {
-    public sealed partial class App : WinoApplication
+    public sealed partial class App : WinoApplication, IRecipient<NewSynchronizationRequested>
     {
         public override string AppCenterKey => "dfdad6ab-95f9-44cc-9112-45ec6730c49e";
 
+        private BackgroundTaskDeferral connectionBackgroundTaskDeferral;
+        private BackgroundTaskDeferral toastActionBackgroundTaskDeferral;
+
         public App()
         {
             InitializeComponent();
+
+            WeakReferenceMessenger.Default.Register(this);
         }
 
         public override IServiceProvider ConfigureServices()
@@ -86,5 +98,47 @@ namespace Wino.Calendar
 
         protected override ActivationHandler<IActivatedEventArgs> GetDefaultActivationHandler()
             => new DefaultActivationHandler();
+
+        public void Receive(NewSynchronizationRequested message)
+        {
+
+        }
+
+
+
+        protected override void OnBackgroundActivated(BackgroundActivatedEventArgs args)
+        {
+            base.OnBackgroundActivated(args);
+
+            if (args.TaskInstance.TriggerDetails is AppServiceTriggerDetails appServiceTriggerDetails)
+            {
+                LogActivation("OnBackgroundActivated -> AppServiceTriggerDetails received.");
+
+                // Only accept connections from callers in the same package
+                if (appServiceTriggerDetails.CallerPackageFamilyName == Package.Current.Id.FamilyName)
+                {
+                    // Connection established from the fulltrust process
+
+                    connectionBackgroundTaskDeferral = args.TaskInstance.GetDeferral();
+                    args.TaskInstance.Canceled += OnConnectionBackgroundTaskCanceled;
+
+                    AppServiceConnectionManager.Connection = appServiceTriggerDetails.AppServiceConnection;
+
+                    WeakReferenceMessenger.Default.Send(new WinoServerConnectionEstablished());
+                }
+            }
+        }
+
+        public void OnConnectionBackgroundTaskCanceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
+        {
+            sender.Canceled -= OnConnectionBackgroundTaskCanceled;
+
+            Log.Information($"Server connection background task was canceled. Reason: {reason}");
+
+            connectionBackgroundTaskDeferral?.Complete();
+            connectionBackgroundTaskDeferral = null;
+
+            AppServiceConnectionManager.Connection = null;
+        }
     }
 }