Integrate Auth0 in a MAUI application targetting iOS, macOS or Android by using the Auth0.OIdcClient.MAUI SDK.

The SDK can be installed through Nuget:

Install-Package Auth0.OIdcClient.MAUI

Once the SDK has been installed, you can integrate it by instantiating the Auth0Client:

var client = new Auth0Client(new Auth0ClientOptions()
{
  Domain = "YOUR_AUTH0_DOMAIN",
  ClientId = "YOUR_AUTH0_CLIENT_ID",
  RedirectUri = "myapp://callback",
  PostLogoutRedirectUri = "myapp://callback"
});

In order to use the SDK with Android and Windows, you need some platform specific configuration.

Create a new Activity that extends WebAuthenticatorCallbackActivity:

[Activity(NoHistory = true, LaunchMode = LaunchMode.SingleTop, Exported = true)]
[IntentFilter(new[] { Intent.ActionView },
              Categories = new[] { Intent.CategoryDefault, Intent.CategoryBrowsable },
              DataScheme = CALLBACK_SCHEME)]
public class WebAuthenticatorActivity : Microsoft.Maui.Authentication.WebAuthenticatorCallbackActivity
{
    const string CALLBACK_SCHEME = "myapp";
}

The above activity will ensure the application can handle the myapp://callback URL when Auth0 redirects back to the Android application after logging in.

To make sure it can properly reactivate your application after being redirected back go Auth0, you need to do two things:

• Add the corresponding protocol to the Package.appxmanifest. In this case, this is set to myapp, but you can change this to whatever you like (ensure to update all relevant Auth0 URLs as well).

  <Applications>
    <Application Id="App" Executable="$targetnametoken$.exe" EntryPoint="$targetentrypoint$">
      <Extensions>
        <uap:Extension Category="windows.protocol">
          <uap:Protocol Name="myapp"/>
        </uap:Extension>
      </Extensions>
    </Application>
  </Applications>

• Call Activator.Default.CheckRedirectionActivation() in the Windows specific App.xaml.cs file.

  public App()
  {
    if (Auth0.OidcClient.Platforms.Windows.Activator.Default.CheckRedirectionActivation())
      return;
  
    this.InitializeComponent();
  }

In order to add login, you can call LoginAsync on the Auth0Client instance.

var loginResult = await client.LoginAsync();

The returned LoginResult indicates whether or not the request was succesful through the IsError property. Incase it was succesful, you can retrieve the user using the LoginResult.User property.

if (loginResult.IsError == false)
{
    var user = loginResult.User
}

Logging out of the SDK comes down to calling LogoutAsync on the Auth0Client instance.

await client.LogoutAsync();