⭐Mobile App - process autologin (#1202)

* handle confirmation email autologin token

* do not display error that login page close unexpectedly after autologin

* App.xaml.cs - remove InvokeOnMainThreadAsync

rename method

* added InitializeMainPage extension method

src/MobileUI/Common/ApplicationExtension.cs

@@ -0,0 +1,16 @@
+namespace SSW.Rewards.Mobile.Common;
+public static class ApplicationExtension
+{
+    public static async Task InitializeMainPage(this Application application)
+    {
+        if (!(application.MainPage is AppShell))
+        {
+            await MainThread.InvokeOnMainThreadAsync(() =>
+            {
+                application.MainPage = new AppShell();
+            });
+        }
+
+        await Shell.Current.GoToAsync("//main");
+    }
+}

src/MobileUI/Features/App.xaml.cs

@@ -45,24 +45,32 @@ protected override async void OnAppLinkRequestReceived(Uri uri)
     {
         base.OnAppLinkRequestReceived(uri);
 
-        if (uri.Scheme != ApiClientConstants.RewardsQRCodeProtocol)
+        if (uri.Scheme == ApiClientConstants.RewardsQRCodeProtocol)
         {
-            return;
-        }
-
-        var queryDictionary = System.Web.HttpUtility.ParseQueryString(uri.Query);
-        var code = queryDictionary.Get(ApiClientConstants.RewardsQRCodeProtocolQueryName);
+            var queryDictionary = System.Web.HttpUtility.ParseQueryString(uri.Query);
+            var code = queryDictionary.Get(ApiClientConstants.RewardsQRCodeProtocolQueryName);
 
-        if (_authService.IsLoggedIn)
-        {
-            var vm = ActivatorUtilities.CreateInstance<ScanResultViewModel>(_provider);
-            var popup = new PopupPages.ScanResult(vm, code);
-            await MopupService.Instance.PushAsync(popup);
+            if (_authService.IsLoggedIn)
+            {
+                var vm = ActivatorUtilities.CreateInstance<ScanResultViewModel>(_provider);
+                var popup = new PopupPages.ScanResult(vm, code);
+                await MopupService.Instance.PushAsync(popup);
+            }
+            else
+            {
+                ((LoginPage)MainPage)?.QueueCodeScan(code);
+            }
         }
-        else
+        else if ($"{uri.Scheme}://{uri.Host}" == Constants.AuthRedirectUrl)
         {
-            ((LoginPage)MainPage)?.QueueCodeScan(code);
-        }
+            var queryDictionary = System.Web.HttpUtility.ParseQueryString(uri.Query);
+            var token = queryDictionary.Get("token");
+
+            if (!string.IsNullOrEmpty(token))
+            {
+                await _authService.AutologinAsync(token);
+            }
+        }        
     }
 
     private async Task CheckApiCompatibilityAsync()

src/MobileUI/Features/Login/LoginPageViewModel.cs

@@ -2,6 +2,7 @@
 using CommunityToolkit.Mvvm.Input;
 using Microsoft.AppCenter.Crashes;
 using Mopups.Services;
+using SSW.Rewards.Mobile.Common;
 
 namespace SSW.Rewards.Mobile.ViewModels;
 
@@ -65,8 +66,14 @@ private async Task LoginTapped()
             if (status != ApiStatus.Success)
             {
                 await WaitForWindowClose();
-                var alert = statusAlerts.GetValueOrDefault(status, (Title: "Unexpected Error", Message: "Something went wrong there, please try again later."));
-                await App.Current.MainPage.DisplayAlert(alert.Title, alert.Message, "OK");
+
+                // Only display error if user is not logged in.
+                // Autologin will fall here, if login page is opened, despite being successfull.
+                if (_authService.IsLoggedIn && _authService.HasCachedAccount)
+                {
+                    var alert = statusAlerts.GetValueOrDefault(status, (Title: "Unexpected Error", Message: "Something went wrong there, please try again later."));
+                    await App.Current.MainPage.DisplayAlert(alert.Title, alert.Message, "OK");
+                }
             }
             else
             {
@@ -130,8 +137,8 @@ await Application.Current.MainPage.DisplayAlert("Login Failure",
 
     private async Task OnAfterLogin()
     {
-        Application.Current.MainPage = new AppShell();
-        await Shell.Current.GoToAsync("//main");
+        await Application.Current.InitializeMainPage();
+
         var granted = await _permissionsService.CheckAndRequestPermission<Permissions.PostNotifications>();
         if (granted)
         {

src/MobileUI/Platforms/Android/MainActivity.cs

@@ -1,11 +1,7 @@
 using Android.App;
 using Android.Content.PM;
-using Android.Gms.Extensions;
 using Android.OS;
-using Firebase.Messaging;
 using Microsoft.Maui.Controls.Compatibility.Platform.Android;
-using Microsoft.Maui.Controls.PlatformConfiguration;
-using SSW.Rewards.Mobile.Platforms.Android;
 using Color = Microsoft.Maui.Graphics.Color;
 
 namespace SSW.Rewards.Mobile;

src/MobileUI/Services/AuthenticationService.cs

@@ -1,13 +1,16 @@
+using System.IdentityModel.Tokens.Jwt;
 using IdentityModel.Client;
 using IdentityModel.OidcClient;
 using IdentityModel.OidcClient.Results;
 using Microsoft.AppCenter.Crashes;
+using SSW.Rewards.Mobile.Common;
 using IBrowser = IdentityModel.OidcClient.Browser.IBrowser;
 
 namespace SSW.Rewards.Mobile.Services;
 
 public interface IAuthenticationService
 {
+    Task AutologinAsync(string accessToken);
     Task<ApiStatus> SignInAsync();
     Task<string> GetAccessToken();
     Task SignOut();
@@ -42,6 +45,44 @@ public AuthenticationService(IBrowser browser)
         };
     }
 
+    public async Task AutologinAsync(string accessToken)
+    {
+        try
+        {
+            var tokenHandler = new JwtSecurityTokenHandler();
+            var jwtToken = tokenHandler.ReadJwtToken(accessToken);
+
+            _accessToken = accessToken;
+            _tokenExpiry = jwtToken.ValidTo;
+
+            try
+            {
+                Preferences.Set(nameof(HasCachedAccount), true);
+                DetailsUpdated?.Invoke(this, EventArgs.Empty);
+
+                await Application.Current.InitializeMainPage();
+            }
+            catch (Exception ex)
+            {
+                Crashes.TrackError(new Exception("Failed to set a logged-in state"));
+
+                // TECH DEBT: Workaround for iOS since calling DisplayAlert while a Safari web view is in
+                // the process of closing causes the alert to never appear and the await call never returns.
+                if (DeviceInfo.Platform == DevicePlatform.iOS)
+                {
+                    await Task.Delay(1000);
+                }
+
+                await App.Current.MainPage.DisplayAlert("Login Failure", "There seems to have been a problem logging you in. Please try again.", "OK");
+            }
+        }
+        catch (Exception ex)
+        {
+            Crashes.TrackError(new Exception($"AuthDebug: unknown exception was thrown during SignIn ${ex.Message}; ${ex.StackTrace}"));
+            await SignOut();
+        }
+    }
+
     public async Task<ApiStatus> SignInAsync()
     {
         try