How to use Xamarin.Forms with Xamarin.Auth to store and retrieve Account object

Question

In a Xamarin.Forms project and I'd like to use Xamarin.Auth just to store and retrieve Account object securely. Please note that I am not taking about integrating with Facebook, Google or any other service that serves end-to-end oAuth login experience.

score 2 · Answer 1 · answered Feb 25 '15 at 20:54

If you are only after secure storage of objects then XLabs.Platform has ISecureStorage interface which is implemented for iOS, Android & WP. If you are working with Forms I would suggest installing XLabs.Forms package from NuGet and then using Ioc (XLabs.Ioc) inject the implementations to PCL code. You can also use XLabs.Serialization to serializer/deserialize bytes using Json.NET, ServiceStack or other serializers like ProtoBuffer (available as XLabs.Serialization plugins).

https://github.com/XLabs/Xamarin-Forms-Labs/blob/master/src/Platform/XLabs.Platform/Services/ISecureStorage.cs

https://www.nuget.org/packages?q=XLabs

score 1 · Answer 2 · answered Feb 25 '15 at 15:18

This topic is being discussed over at the Xamarin Forums. You might want to check out the thread there.

Xamarin.Auth is not a PCL and platform specific. You'll need to work with custom renderers. First create a Forms page for your login:

public class LoginPage : ContentPage
{
}

then implement it for the platforms, here for instance iOS:

[assembly: ExportRenderer (typeof (LoginPage), typeof (LoginPageRenderer))]

namespace Demo.XForms.iOS
{
    public class LoginPageRenderer : PageRenderer
    {
        public override void ViewDidAppear (bool animated)
        {
            base.ViewDidAppear (animated);

            var auth = new OAuth2Authenticator (
                clientId: ...,
                scope: "basic",
                authorizeUrl: new Uri ("..."),
                redirectUrl: new Uri ("..."));

            auth.Completed += (sender, eventArgs) => {
                DismissViewController (true, null);
                if (eventArgs.IsAuthenticated) {
                    App.SaveToken(eventArgs.Account.Properties["access_token"]);
                } else {
                    // The user cancelled
                }
            };

            PresentViewController (auth.GetUI (), true, null);
        }
    }
}

With that in place you can use it from within Forms:

this.MainPage = new LoginPage ();

this.myself · Answer 3 · 2019-07-23T07:11:55.440

In 2019, you can use SecureStorage from Xamarin.Essentials to store account information. Under the hood, it uses the the platform standards: Keychain on iOS, Keystore on Android. Thus it also supports backup to cloud, but also needs permissions.

https://learn.microsoft.com/en-us/xamarin/essentials/secure-storage

Also, the AccountStore in Xamarin.Auth is deprecated now and they are advising to use SecureStorage from Xamarin.Essentials now.

How to use Xamarin.Forms with Xamarin.Auth to store and retrieve Account object

3 Answers3