Maui Blazor (Hybrid) App Can't Login #7908

5 Answer(s)

• 

  0

  liangshiwei created one month ago

  Support Team Fullstack Developer

  I will check it

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• 

  0

  liangshiwei created one month ago

  Support Team Fullstack Developer

  Hi,

  I can reproduce the problem, we will fix it in the next patch version.

  your ticket was refunded.

  Here is the temporary solution

   public sealed class MyWebAuthenticator
   {
       /// <summary>
       /// Begin an authentication flow by navigating to the specified url and waiting for a callback/redirect to the callbackUrl scheme.
       /// </summary>
       /// <param name="authorizeUri">Url to navigate to, beginning the authentication flow.</param>
       /// <param name="callbackUri">Expected callback url that the navigation flow will eventually redirect to.</param>
       /// <returns>Returns a result parsed out from the callback url.</returns>
       public static Task<WebAuthenticatorResult> AuthenticateAsync(Uri authorizeUri, Uri callbackUri) =>
           Instance.Authenticate(authorizeUri, callbackUri);
  
       private static readonly MyWebAuthenticator Instance = new MyWebAuthenticator();
  
       private Dictionary<string, TaskCompletionSource<Uri>> tasks = new Dictionary<string, TaskCompletionSource<Uri>>();
  
       private MyWebAuthenticator()
       {
           Microsoft.Windows.AppLifecycle.AppInstance.GetCurrent().Activated += CurrentAppInstance_Activated;
       }
  
       [System.Runtime.CompilerServices.ModuleInitializer]
       internal static void Init()
       {
           try
           {
               OnAppCreation();
           }
           catch (Exception ex)
           {
               System.Diagnostics.Trace.WriteLine("WinUIEx: Failed to initialize the WebAuthenticator: " + ex.Message,
                   "WinUIEx");
           }
       }
  
       private static bool IsUriProtocolDeclared(string scheme)
       {
           if (global::Windows.ApplicationModel.Package.Current is null)
               return false;
           var docPath = Path.Combine(global::Windows.ApplicationModel.Package.Current.InstalledLocation.Path,
               "AppxManifest.xml");
           var doc = XDocument.Load(docPath, LoadOptions.None);
           var reader = doc.CreateReader();
           var namespaceManager = new XmlNamespaceManager(reader.NameTable);
           namespaceManager.AddNamespace("x", "http://schemas.microsoft.com/appx/manifest/foundation/windows10");
           namespaceManager.AddNamespace("uap", "http://schemas.microsoft.com/appx/manifest/uap/windows10");
  
           // Check if the protocol was declared
           var decl = doc.Root?.XPathSelectElements(
               $"//uap:Extension[@Category='windows.protocol']/uap:Protocol[@Name='{scheme}']", namespaceManager);
  
           return decl != null && decl.Any();
       }
  
       private static System.Collections.Specialized.NameValueCollection? GetState(
           Microsoft.Windows.AppLifecycle.AppActivationArguments activatedEventArgs)
       {
           if (activatedEventArgs.Kind == Microsoft.Windows.AppLifecycle.ExtendedActivationKind.Protocol &&
               activatedEventArgs.Data is IProtocolActivatedEventArgs protocolArgs)
           {
               return GetState(protocolArgs);
           }
  
           return null;
       }
  
       private static NameValueCollection? GetState(IProtocolActivatedEventArgs protocolArgs)
       {
           NameValueCollection? vals = null;
           try
           {
               vals = System.Web.HttpUtility.ParseQueryString(protocolArgs.Uri.Query);
           }
           catch { }
  
           try
           {
               if (vals is null || !(vals["state"] is string))
               {
                   var fragment = protocolArgs.Uri.Fragment;
                   if (fragment.StartsWith("#"))
                   {
                       fragment = fragment.Substring(1);
                   }
  
                   vals = System.Web.HttpUtility.ParseQueryString(fragment);
               }
           }
           catch { }
  
           if (vals != null && vals["state"] is string state)
           {
               var vals2 = System.Web.HttpUtility.ParseQueryString(state);
               // Some services doesn't like & encoded state parameters, and breaks them out separately.
               // In that case copy over the important values
               if (vals.AllKeys.Contains("appInstanceId") && !vals2.AllKeys.Contains("appInstanceId"))
                   vals2.Add("appInstanceId", vals["appInstanceId"]);
               if (vals.AllKeys.Contains("signinId") && !vals2.AllKeys.Contains("signinId"))
                   vals2.Add("signinId", vals["signinId"]);
               return vals2;
           }
  
           return null;
       }
  
       private static void OnAppCreation()
       {
           var activatedEventArgs = Microsoft.Windows.AppLifecycle.AppInstance.GetCurrent()?.GetActivatedEventArgs();
           if (activatedEventArgs is null)
               return;
           var state = GetState(activatedEventArgs);
           if (state is not null && state["appInstanceId"] is string id && state["signinId"] is string signinId &&
               !string.IsNullOrEmpty(signinId))
           {
               var instance = Microsoft.Windows.AppLifecycle.AppInstance.GetInstances().Where(i => i.Key == id)
                   .FirstOrDefault();
  
               if (instance is not null && !instance.IsCurrent)
               {
                   // Redirect to correct instance and close this one
                   instance.RedirectActivationToAsync(activatedEventArgs).AsTask().Wait();
                   System.Diagnostics.Process.GetCurrentProcess().Kill();
               }
           }
           else
           {
               var thisInstance = Microsoft.Windows.AppLifecycle.AppInstance.GetCurrent();
               if (string.IsNullOrEmpty(thisInstance.Key))
               {
                   Microsoft.Windows.AppLifecycle.AppInstance.FindOrRegisterForKey(Guid.NewGuid().ToString());
               }
           }
       }
  
       private void CurrentAppInstance_Activated(object? sender, Microsoft.Windows.AppLifecycle.AppActivationArguments e)
       {
           if (e.Kind == Microsoft.Windows.AppLifecycle.ExtendedActivationKind.Protocol)
           {
               if (e.Data is IProtocolActivatedEventArgs protocolArgs)
               {
                   var vals = GetState(protocolArgs);
                   if (vals is not null && vals["signinId"] is string signinId)
                   {
                       ResumeSignin(protocolArgs.Uri, signinId);
                   }
               }
           }
       }
  
       private void ResumeSignin(Uri callbackUri, string signinId)
       {
           if (signinId != null && tasks.ContainsKey(signinId))
           {
               var task = tasks[signinId];
               tasks.Remove(signinId);
               task.TrySetResult(callbackUri);
           }
       }
  
       private async Task<WebAuthenticatorResult> Authenticate(Uri authorizeUri, Uri callbackUri)
       {
           if (global::Windows.ApplicationModel.Package.Current is null)
           {
               throw new InvalidOperationException("The WebAuthenticator requires a packaged app with an AppxManifest");
           }
  
           var scheme = callbackUri.Scheme;
           if(scheme == "https")
           {
               scheme = callbackUri.AbsolutePath.Substring(callbackUri.AbsolutePath.LastIndexOf('/') + 1);
           }
  
           if (!IsUriProtocolDeclared(scheme))
           {
               throw new InvalidOperationException(
                   $"The URI Scheme {callbackUri.Scheme} is not declared in AppxManifest.xml");
           }
  
           var g = Guid.NewGuid();
           UriBuilder b = new UriBuilder(authorizeUri);
  
           var query = System.Web.HttpUtility.ParseQueryString(authorizeUri.Query);
           var state = $"appInstanceId={Microsoft.Windows.AppLifecycle.AppInstance.GetCurrent().Key}&signinId={g}";
           if (query["state"] is string oldstate && !string.IsNullOrEmpty(oldstate))
           {
               // Encode the state parameter
               state += "&state=" + System.Web.HttpUtility.UrlEncode(oldstate);
           }
  
           query["state"] = state;
           b.Query = query.ToString();
           authorizeUri = b.Uri;
  
           var tcs = new TaskCompletionSource<Uri>();
           var process = new System.Diagnostics.Process();
           process.StartInfo.FileName = "rundll32.exe";
           process.StartInfo.Arguments = "url.dll,FileProtocolHandler " + authorizeUri.ToString();
           process.StartInfo.UseShellExecute = true;
           process.Start();
           tasks.Add(g.ToString(), tcs);
           var uri = await tcs.Task.ConfigureAwait(false);
           return new WebAuthenticatorResult(uri);
       }
   }
  

  
  public class MyMauiAuthenticationBrowser : IBrowser, ITransientDependency
  {
      public async Task<BrowserResult> InvokeAsync(BrowserOptions options, CancellationToken cancellationToken = default)
      {
          try
          {
              WebAuthenticatorResult result = null;
              var webAuthenticatorOptions = new WebAuthenticatorOptions
              {
                  Url = new Uri(options.StartUrl),
                  CallbackUrl = new Uri(options.EndUrl),
                  PrefersEphemeralWebBrowserSession = true
              };
  
  #if WINDOWS
          result =
  await Platforms.Windows.MyWebAuthenticator.AuthenticateAsync(webAuthenticatorOptions.Url, webAuthenticatorOptions.CallbackUrl);
  #else
              result = await WebAuthenticator.AuthenticateAsync(new WebAuthenticatorOptions
              {
                  Url = new Uri(options.StartUrl),
                  CallbackUrl = new Uri(options.EndUrl),
                  PrefersEphemeralWebBrowserSession = true
              });
  #endif
  
  
              return new BrowserResult
              {
                  Response = ToRawIdentityUrl(options.EndUrl, result)
              };
          }
          catch (TaskCanceledException)
          {
              return new BrowserResult
              {
                  ResultType = BrowserResultType.UserCancel
              };
          }
          catch (Exception ex)
          {
              return new BrowserResult
              {
                  ResultType = BrowserResultType.UnknownError,
                  Error = ex.ToString()
              };
          }
      }
  
      private static string ToRawIdentityUrl(string redirectUrl, WebAuthenticatorResult result)
      {
          if (DeviceInfo.Platform == DevicePlatform.WinUI)
          {
              var parameters = result.Properties.Select(pair => $"{pair.Key}={pair.Value}");
              var modifiedParameters = parameters.ToList();
  
              var stateParameter = modifiedParameters
                  .FirstOrDefault(p => p.StartsWith("state", StringComparison.OrdinalIgnoreCase));
  
              if (!string.IsNullOrWhiteSpace(stateParameter))
              {
                  // Remove the state key added by WebAuthenticator that includes appInstanceId
                  modifiedParameters = modifiedParameters
                      .Where(p => !p.StartsWith("state", StringComparison.OrdinalIgnoreCase)).ToList();
  
                  stateParameter = System.Web.HttpUtility.UrlDecode(stateParameter).Split('&').Last();
                  modifiedParameters.Add(stateParameter);
              }
  
              var values = string.Join("&", modifiedParameters);
              return $"{redirectUrl}#{values}";
          }
          else
          {
              var parameters = result.Properties.Select(pair => $"{pair.Key}={pair.Value}");
              var values = string.Join("&", parameters);
  
              return $"{redirectUrl}#{values}";
          }
      }
  }
  

  switch (configuration["OAuthConfig:GrantType"])
  {
      case "password":
          context.Services.AddSingleton<IExternalAuthService, PasswordFlowExternalAuthService>();
          var authServiceClientBuild = context.Services.AddHttpClient(PasswordFlowExternalAuthService.HttpClientName);
  #if DEBUG
          authServiceClientBuild.ConfigurePrimaryHttpMessageHandler(GetInsecureHandler);
  #endif
          break;
      case "code":
          context.Services.AddSingleton<IExternalAuthService, CodeFlowExternalAuthService>();
          Configure<OidcClientOptions>(configuration.GetSection("OAuthConfig"));
  
          context.Services.AddTransient<OidcClient>(sp =>
          {
              var options = sp.GetRequiredService<IOptions<OidcClientOptions>>().Value;
              options.Browser = sp.GetRequiredService<MyMauiAuthenticationBrowser>(); // change to MyMauiAuthenticationBrowser
  
  #if DEBUG
              options.BackchannelHandler = GetInsecureHandler();
  #endif
  
              return new OidcClient(options);
          });
          break;
  }
  

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• 

  0

  DWaterfield created one month ago

  Hi,

  Thanks for the temporary solution. Can we just check we have these changes in the correct place as we're getting a compilation error.

  We have the first two code snippets in here next to the classes they're replacing as this seemed to be the correct location?:

  and the 3rd code change is a straight single line change

  This gives us the expected "type or namespace name..... error as MyMauiAuthenticationBrowser is in the Handheld.Maui project and we're making this single line change in the HandheldMauiBlazorModule.cs file of the Handheld.MauiBlazor project

  Is it the intention that we add a project reference from the Handheld.MauiBlazor to the Handheld.Maui project?

  The Visual Studio hint/help is of course just that

  However even when we do that, we have new errors which is why we think adding a reference between the two projects was not the intention?

  

  Can you please advise us where we've gone wrong adding the two classes MyWebAuthenticator and MyMauiAuthenticationBrowser and how we get this temporary solution into the solution as intended?

  Thanks.

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• 

  0

  liangshiwei created one month ago

  Support Team Fullstack Developer

  Please put them to MauiBlazor project

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• 

  0

  DWaterfield created one month ago

  Thank you that works. We look forward to these changes coming through in the next patch version

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