public void StartAuthentication(string clientId, string scope, string appSecret, Uri authorizeUrl, Uri redirectUrl, Uri tokenUrl, bool codeChallengeMethod)
{
Xamarin.Auth.OAuth2Authenticator oAuth2 = new Xamarin.Auth.OAuth2Authenticator(clientId,
appSecret,
scope,
authorizeUrl,
redirectUrl,
tokenUrl);
oAuth2.Completed += OnOAuth2Completed;
oAuth2.Error += OnOAuth2Error;
Android.Content.Context context = Android.App.Application.Context;
Android.Content.Intent loginUI = oAuth2.GetUI(context);
loginUI.AddFlags(Android.Content.ActivityFlags.NewTask);
context.StartActivity(loginUI);
}
// IOAuthAuthorizeHandler.AuthorizeAsync implementation
public Task <IDictionary <string, string> > AuthorizeAsync(Uri serviceUri, Uri authorizeUri, Uri callbackUri)
{
// If the TaskCompletionSource is not null, authorization may already be in progress and should be cancelled
if (_taskCompletionSource != null)
{
// Try to cancel any existing authentication task
_taskCompletionSource.TrySetCanceled();
}
// Create a task completion source
_taskCompletionSource = new TaskCompletionSource <IDictionary <string, string> >();
#if __ANDROID__ || __IOS__
#if __ANDROID__
// Get the current Android Activity
Activity activity = (Activity)Android.App.Application.Context;
#endif
#if __IOS__
// Get the current iOS ViewController
var viewController = Xamarin.Forms.Platform.iOS.Platform.GetRenderer(this).ViewController;
#endif
// Create a new Xamarin.Auth.OAuth2Authenticator using the information passed in
Xamarin.Auth.OAuth2Authenticator authenticator = new Xamarin.Auth.OAuth2Authenticator(
clientId: AppClientId,
scope: "",
authorizeUrl: authorizeUri,
redirectUrl: callbackUri)
{
ShowErrors = false
};
// Allow the user to cancel the OAuth attempt
authenticator.AllowCancel = true;
// Define a handler for the OAuth2Authenticator.Completed event
authenticator.Completed += (sender, authArgs) =>
{
try
{
#if __IOS__
// Dismiss the OAuth UI when complete
viewController.DismissViewController(true, null);
#endif
// Check if the user is authenticated
if (authArgs.IsAuthenticated)
{
// If authorization was successful, get the user's account
Xamarin.Auth.Account authenticatedAccount = authArgs.Account;
// Set the result (Credential) for the TaskCompletionSource
_taskCompletionSource.SetResult(authenticatedAccount.Properties);
}
else
{
throw new Exception("Unable to authenticate user.");
}
}
catch (Exception ex)
{
// If authentication failed, set the exception on the TaskCompletionSource
_taskCompletionSource.TrySetException(ex);
// Cancel authentication
authenticator.OnCancelled();
}
#if __ANDROID__
finally
{
// Dismiss the OAuth login
activity.FinishActivity(99);
}
#endif
};
// If an error was encountered when authenticating, set the exception on the TaskCompletionSource
authenticator.Error += (sndr, errArgs) =>
{
// If the user cancels, the Error event is raised but there is no exception ... best to check first
if (errArgs.Exception != null)
{
_taskCompletionSource.TrySetException(errArgs.Exception);
}
else
{
// Login canceled: dismiss the OAuth login
if (_taskCompletionSource != null)
{
_taskCompletionSource.TrySetCanceled();
#if __ANDROID__
activity.FinishActivity(99);
#endif
}
}
// Cancel authentication
authenticator.OnCancelled();
};
// Present the OAuth UI so the user can enter user name and password
#if __ANDROID__
var intent = authenticator.GetUI(activity);
activity.StartActivityForResult(intent, 99);
#endif
#if __IOS__
// Present the OAuth UI (on the app's UI thread) so the user can enter user name and password
Device.BeginInvokeOnMainThread(() =>
{
viewController.PresentViewController(authenticator.GetUI(), true, null);
});
#endif
#endif
// Return completion source task so the caller can await completion
return(_taskCompletionSource.Task);
}
// IOAuthAuthorizeHandler.AuthorizeAsync implementation.
public Task <IDictionary <string, string> > AuthorizeAsync(Uri serviceUri, Uri authorizeUri, Uri callbackUri)
{
// If the TaskCompletionSource is not null, authorization is in progress.
if (_taskCompletionSource != null)
{
// Allow only one authorization process at a time.
throw new Exception();
}
// Create a task completion source.
_taskCompletionSource = new TaskCompletionSource <IDictionary <string, string> >();
// Create a new Xamarin.Auth.OAuth2Authenticator using the information passed in.
_auth = new OAuth2Authenticator(
clientId: AppClientId,
scope: "",
authorizeUrl: authorizeUri,
redirectUrl: new Uri(OAuthRedirectUrl))
{
// Allow the user to cancel the OAuth attempt.
AllowCancel = true
};
// Define a handler for the OAuth2Authenticator.Completed event.
_auth.Completed += (object sender, AuthenticatorCompletedEventArgs args) =>
{
try
{
// Dismiss the OAuth UI when complete.
this.DismissViewController(true, null);
// Throw an exception if the user could not be authenticated.
if (!args.IsAuthenticated)
{
throw new Exception("Unable to authenticate user.");
}
// If authorization was successful, get the user's account.
Xamarin.Auth.Account authenticatedAccount = args.Account;
// Set the result (Credential) for the TaskCompletionSource.
_taskCompletionSource.SetResult(authenticatedAccount.Properties);
}
catch (Exception ex)
{
// If authentication failed, set the exception on the TaskCompletionSource.
_taskCompletionSource.SetException(ex);
}
};
// If an error was encountered when authenticating, set the exception on the TaskCompletionSource.
_auth.Error += (object sender, AuthenticatorErrorEventArgs args) =>
{
if (args.Exception != null)
{
_taskCompletionSource.TrySetException(args.Exception);
}
else
{
_taskCompletionSource.TrySetException(new Exception(args.Message));
}
};
// Present the OAuth UI (on the app's UI thread) so the user can enter user name and password.
InvokeOnMainThread(() => { this.PresentViewController(_auth.GetUI(), true, null); });
// Return completion source task so the caller can await completion.
return(_taskCompletionSource.Task);
}
// IOAuthAuthorizeHandler.AuthorizeAsync implementation.
public Task <IDictionary <string, string> > AuthorizeAsync(Uri serviceUri, Uri authorizeUri, Uri callbackUri)
{
// If the TaskCompletionSource is not null, authorization may already be in progress and should be canceled.
// Try to cancel any existing authentication process.
_taskCompletionSource?.TrySetCanceled();
// Create a task completion source.
_taskCompletionSource = new TaskCompletionSource <IDictionary <string, string> >();
// Create a new Xamarin.Auth.OAuth2Authenticator using the information passed in.
_auth = new OAuth2Authenticator(
clientId: AppClientId,
scope: "",
authorizeUrl: authorizeUri,
redirectUrl: new Uri(OAuthRedirectUrl))
{
ShowErrors = false,
// Allow the user to cancel the OAuth attempt.
AllowCancel = true
};
// Define a handler for the OAuth2Authenticator.Completed event.
_auth.Completed += (o, authArgs) =>
{
try
{
// Dismiss the OAuth UI when complete.
InvokeOnMainThread(() => { UIApplication.SharedApplication.KeyWindow.RootViewController.DismissViewController(true, null); });
// Check if the user is authenticated.
if (authArgs.IsAuthenticated)
{
// If authorization was successful, get the user's account.
Xamarin.Auth.Account authenticatedAccount = authArgs.Account;
// Set the result (Credential) for the TaskCompletionSource.
_taskCompletionSource.SetResult(authenticatedAccount.Properties);
}
else
{
throw new Exception("Unable to authenticate user.");
}
}
catch (Exception ex)
{
// If authentication failed, set the exception on the TaskCompletionSource.
_taskCompletionSource.TrySetException(ex);
// Cancel authentication.
_auth.OnCancelled();
}
};
// If an error was encountered when authenticating, set the exception on the TaskCompletionSource.
_auth.Error += (o, errArgs) =>
{
// If the user cancels, the Error event is raised but there is no exception ... best to check first.
if (errArgs.Exception != null)
{
_taskCompletionSource.TrySetException(errArgs.Exception);
}
else
{
// Login canceled: dismiss the OAuth login.
_taskCompletionSource?.TrySetCanceled();
}
// Cancel authentication.
_auth.OnCancelled();
_auth = null;
};
// Present the OAuth UI (on the app's UI thread) so the user can enter user name and password.
InvokeOnMainThread(() => { UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(_auth.GetUI(), true, null); });
// Return completion source task so the caller can await completion.
return(_taskCompletionSource.Task);
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
spinner = FindViewById <Spinner>(Resource.Id.spinner);
var adapter = new ArrayAdapter <string>(this, Android.Resource.Layout.SimpleSpinnerItem, new string[] { "<none>", "Profile", "Activity", "Heart Rate", "Sleep" });
adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
spinner.Adapter = adapter;
spinner.ItemSelected += (object sender, AdapterView.ItemSelectedEventArgs e) =>
{
if (e.Id == 1) //get profile
{
GetData(Constants.Fitbit.ProfileUrl);
}
else if (e.Id == 2) //get activity
{
GetData(Constants.Fitbit.ActivityUrl.Replace("[date]", DateTime.Today.ToString("yyyy-MM-dd")));
}
else if (e.Id == 3) // get heart rate
{
GetData(Constants.Fitbit.HeartRateUrl.Replace("[date]", "today").Replace("[range]", "1d"));
}
else if (e.Id == 4) //Sleep
{
GetData(Constants.Fitbit.SleepUrl.Replace("[date]", DateTime.Today.ToString("yyyy-MM-dd")));
}
};
spinner.Enabled = false;
textResult = FindViewById <EditText>(Resource.Id.editText1);
Button button1 = FindViewById <Button>(Resource.Id.button1);
// wire up add task button handler
if (button1 != null)
{
button1.Click += (sender, e) =>
{
Toast.MakeText(this, "Trying to authenticate with fitbit!", ToastLength.Short);
//store = AccountStore.Create(this, "test123");
//account = store.FindAccountsForService(Constants.Fitbit.AppName).FirstOrDefault();
/*** OAuth2Authenticator object fails to authenticate with fitbit (it works for google though). However, it fires the OnAuthError method which we can use our way to get around the authentication.
* we simply use it currently to present the fitbit authentication screen for the user, and make use of the OnAuthError event to proceed with our authentication mechanism.
*/
authenticator = new OAuth2Authenticator(Constants.Fitbit.AndroidClientId, Constants.Fitbit.ClientSecret, Constants.Fitbit.Scope,
new Uri(Constants.Fitbit.AuthorizeUrl),
new Uri(Constants.Fitbit.AndroidRedirectUrl), new Uri(Constants.Fitbit.AccessTokenUrl), null, true);
authenticator.AllowCancel = true;
authenticator.Completed += OnAuthCompleted;
authenticator.Error += OnAuthError;
AuthenticationState.Authenticator = authenticator;
auth_ui = authenticator.GetUI(this);
StartActivity(auth_ui);
};
}
}
