jsauve / oauthtwodemo.xforms

Xamarin.Auth with Xamarin.Forms for iOS and Android

A simple demo of Xamarin.Auth in Xamarin.Forms

This demo does not cover pulling back any profile data (or any other data) from your given auth provider's API (Facebook, Instagram, Twitter, Google, etc, etc, etc), but it will get you authenticated. After successful authentication, it's up to you to make subsequent calls against your chosen API with the auth token you receive.

Edit the App.cs class in the core project:

You'll need to edit the following in the App.cs in order to get the sample working with your OAuth provider:

_Instance.OAuthSettings = 
    new OAuthSettings (
        clientId: "",       // your OAuth2 client id 
        scope: "",          // The scopes for the particular API you're accessing. The format for this will vary by API.
        authorizeUrl: "",   // the auth URL for the service
        redirectUrl: "");   // the redirect URL for the service
        
        // If you'd like to know more about how to integrate with an OAuth provider, 
        // I personally like the Instagram API docs: http://instagram.com/developer/authentication/

What you get:

oauthtwodemo.xforms's Issues

Query relating to redirectUrl ?

Why are you setting the redirectUrl to http://www.facebook.com/connect/login_success.html url, this should be the url of your mobile app right. Can you please explain how does this works?

System.MissingMethodException: Method 'Android.Views.ViewGroup.get_ClipChildren' not found.

intsagram app id created and just put client id, and delte bin and obj folders from project and run the project the above exception error

I dont see OAuth2Authenticator

Where is this OAuth2Authenticator class located , i searched the whole project but its not available?

08-13 12:15:51.419 E/mono ( 1516): System.NullReferenceException: Object reference not set to an instance of an object.

When I attempt to run, I get this error:

An unhandled exception occured.

08-13 12:15:51.419 E/mono    ( 1516): 
08-13 12:15:51.419 E/mono    ( 1516): Unhandled Exception:
08-13 12:15:51.419 E/mono    ( 1516): System.NullReferenceException: Object reference not set to an instance of an object.
08-13 12:15:51.419 E/mono    ( 1516):   at (wrapper dynamic-method) System.Object:841dfca9-313d-4d04-b6fc-473c386af2df (intptr,intptr,bool,int,int,int,int)
08-13 12:15:51.419 E/mono    ( 1516):   at (wrapper native-to-managed) System.Object:841dfca9-313d-4d04-b6fc-473c386af2df (intptr,intptr,int,int,int,int,int)
In mgmain JNI_OnLoad
08-13 12:15:51.419 E/mono-rt ( 1516): [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object.
08-13 12:15:51.419 E/mono-rt ( 1516):   at (wrapper dynamic-method) System.Object:841dfca9-313d-4d04-b6fc-473c386af2df (intptr,intptr,bool,int,int,int,int)
08-13 12:15:51.419 E/mono-rt ( 1516):   at (wrapper native-to-managed) System.Object:841dfca9-313d-4d04-b6fc-473c386af2df (intptr,intptr,int,int,int,int,int)

Do you have any suggestions? TIA.

UPDATE:

This is the line where it is throwing the exception:

            var auth = new OAuth2Authenticator (
                clientId: App.Instance.OAuthSettings.ClientId, // your OAuth2 client id
                scope: App.Instance.OAuthSettings.Scope, // The scopes for the particular API you're accessing. The format for this will vary by API.
                authorizeUrl: new Uri (App.Instance.OAuthSettings.AuthorizeUrl), // the auth URL for the service
                redirectUrl: new Uri (App.Instance.OAuthSettings.RedirectUrl)); // the redirect URL for the service

Problem after migrating to Xamarin.Forms 1.3

Hi,

According to this article: http://developer.xamarin.com/guides/cross-platform/macios/updating-xamarin-forms-apps/

I would like to use LoadApplication (new App ()); instead off SetPage(App.RootPage()); but after this
public static Action SuccessfulLoginAction { get { return new Action (() => { _NavPage.Navigation.PopModalAsync(); }); } }
application crashes because of _NavPage is probably null.

Any workarounds?

Best,
Tomek

Android.Views.WindowManagerBadTokenException: Exception of type 'Android.Views.WindowManagerBadTokenException' was thrown

Hi,
I used your code for my app but when I invoke an action in my android page renderer I get the above error. This is my code:

protected override void OnElementChanged(ElementChangedEventArgs e)
{
base.OnElementChanged(e);

        var activity = this.Context as Activity;

        var auth = new OAuth2Authenticator(
            clientId: App.GoogleApiClientId,
            clientSecret: App.GoogleApiClientSecret,
            scope: "email",
            authorizeUrl: new Uri(App.GoogleApiAuthorizeUrl),
            redirectUrl: new Uri(App.GoogleApiRedirectUrl2),
            accessTokenUrl: new Uri(App.GoogleApiAccessTokenUrl),
            getUsernameAsync: null
        );

        auth.Title = App.GetTextFromKey("Login");
        auth.AllowCancel = false;

        auth.Completed += (sender, eventArgs) =>
        {
            if (eventArgs.IsAuthenticated)
            {
                string code = "";
                eventArgs.Account.Properties.TryGetValue("access_token", out code);
                Console.WriteLine("ac: " + code);

                App.GoogleApiAccesToken = code;

                eventArgs.Account.Properties.TryGetValue("refresh_token", out code);
                Console.WriteLine("rc: " + code);

                NavHelper.Nav.NavigateToValidationPageAction.Invoke();
            }
        };

        activity.StartActivity(auth.GetUI(activity));
    }

public Action NavigateToValidationPageAction
{
get
{
return new Action(() =>
{
App.LoginOk = true;
NavPage.Navigation.PopModalAsync();
}
});
}
}

Doesn't seem to work right with Facebook.

Documented multiple places.

xamarin/Xamarin.Auth#70
http://forums.xamarin.com/discussion/25183/xamarin-forms-xamarin-auth-and-facebook?new=1
http://www.joesauve.com/using-xamarin-auth-with-xamarin-forms/

It will authenticate, but following that you only get a white screen with the red text mentioned in the other posts.

It's worth noting that the Android app works slightly better. For some odd reason you have to login to FB twice but on the second time it will properly redirect to the Profile page.