private void SetResultSafe(FingerprintAuthenticationResult result)
{
if (!(_taskCompletionSource.Task.IsCanceled || _taskCompletionSource.Task.IsCompleted || _taskCompletionSource.Task.IsFaulted))
{
_taskCompletionSource.SetResult(result);
}
}
protected override async Task<FingerprintAuthenticationResult> NativeAuthenticateAsync(AuthenticationRequestConfiguration authRequestConfig, CancellationToken cancellationToken = new CancellationToken())
{
var result = new FingerprintAuthenticationResult();
SetupContextProperties(authRequestConfig);
Tuple<bool, NSError> resTuple;
using (cancellationToken.Register(CancelAuthentication))
{
resTuple = await _context.EvaluatePolicyAsync(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, authRequestConfig.Reason);
}
if (resTuple.Item1)
{
result.Status = FingerprintAuthenticationResultStatus.Succeeded;
}
else
{
switch ((LAStatus)(int)resTuple.Item2.Code)
{
case LAStatus.AuthenticationFailed:
var description = resTuple.Item2.Description;
if (description != null && description.Contains("retry limit exceeded"))
{
result.Status = FingerprintAuthenticationResultStatus.TooManyAttempts;
}
else
{
result.Status = FingerprintAuthenticationResultStatus.Failed;
}
break;
case LAStatus.UserCancel:
case LAStatus.AppCancel:
result.Status = FingerprintAuthenticationResultStatus.Canceled;
break;
case LAStatus.UserFallback:
result.Status = FingerprintAuthenticationResultStatus.FallbackRequested;
break;
case LAStatus.TouchIDLockout:
result.Status = FingerprintAuthenticationResultStatus.TooManyAttempts;
break;
default:
result.Status = FingerprintAuthenticationResultStatus.UnknownError;
break;
}
result.ErrorMessage = resTuple.Item2.LocalizedDescription;
}
CreateNewContext();
return result;
}
private async Task SetResultAsync(FingerprintAuthenticationResult result)
{
if (result.Authenticated)
{
await Navigation.PushAsync(new SecretView());
}
else
{
lblStatus.Text = $"{result.Status}: {result.ErrorMessage}";
}
}
public override void OnAuthenticationError(FingerprintState errorCode, ICharSequence errString)
{
base.OnAuthenticationError(errorCode, errString);
var message = errString != null ? errString.ToString() : string.Empty;
var result = new FingerprintAuthenticationResult { Status = FingerprintAuthenticationResultStatus.Failed, ErrorMessage = message };
if (errorCode == FingerprintState.ErrorLockout)
{
result.Status = FingerprintAuthenticationResultStatus.TooManyAttempts;
}
SetResultSafe(result);
}
// https://developer.android.com/reference/android/hardware/fingerprint/FingerprintManager.AuthenticationCallback.html
public override void OnAuthenticationSucceeded(FingerprintManager.AuthenticationResult res)
{
base.OnAuthenticationSucceeded(res);
var result = new FingerprintAuthenticationResult { Status = FingerprintAuthenticationResultStatus.Succeeded };
SetResultSafe(result);
}
private async void Dismiss(FingerprintAuthenticationResult result, bool animation = true)
{
if (animation)
{
await AnimateResultAsync(result.Status);
}
_resultTaskCompletionSource.SetResult(result);
Dismiss();
}
