private BiometricPrompt.AuthenticationCallback GetBiometricAuthenticationCallback(Func <Task> action)
{
var callback = new BiometricAuthenticationCallback
{
Success = (result) =>
{
Toast.MakeText(_context, "Authentication succeeded.", ToastLength.Short).Show();
action();
},
Failed = () =>
{
},
Error = (errorCode, errString) =>
{
},
};
return(callback);
}
private void ShowBiometicPrompt(IBioAuthCompleted bioAuthCompleted)
{
var activity = (FragmentActivity)CrossCurrentActivity.Current.Activity;
var executor = ContextCompat.GetMainExecutor(activity);
var callback = new BiometricAuthenticationCallback
{
Success = (AndroidX.Biometric.BiometricPrompt.AuthenticationResult result) => {
try
{
bioAuthCompleted.OnCompleted(BioAuthStatus.SUCCESS);
}
catch (SignatureException)
{
throw new RuntimeException();
}
},
Failed = () => {
// TODO: Show error.
bioAuthCompleted.OnCompleted(BioAuthStatus.FAILED);
},
Help = (BiometricAcquiredStatus helpCode, ICharSequence helpString) => {
// TODO: What do we do here?
}
};
//Create prompt info
var promptInfo = new AndroidX.Biometric.BiometricPrompt.PromptInfo.Builder()
.SetTitle("Biometric login for my app")
.SetSubtitle("Log in using your biometric credential")
.SetNegativeButtonText("Use account password")
.Build();
//Create prompt
var biometricPrompt = new AndroidX.Biometric.BiometricPrompt(activity, executor, callback);
//call Authenticate
biometricPrompt.Authenticate(promptInfo);
}
private BiometricPrompt.AuthenticationCallback GetAuthenticationCallback()
{
// Callback for biometric authentication result
var callback = new BiometricAuthenticationCallback
{
Success = (BiometricPrompt.AuthenticationResult result) => {
var signature = result.CryptoObject.Signature;
try
{
signature.Update(Encoding.ASCII.GetBytes(signatureMessage));
var signatureString = Base64.EncodeToString(signature.Sign(), Base64Flags.UrlSafe);
// Normally, ToBeSignedMessage and Signature are sent to the server and then verified
// Toast.MakeText (getApplicationContext (), signatureMessage + ":" + signatureString, Toast.LENGTH_SHORT).show ();
MessagingCenter.Send <object>("BiometricPrompt", "Success");
}
catch (SignatureException)
{
throw new RuntimeException();
}
},
Failed = () => {
MessagingCenter.Send <object>("BiometricPrompt", "Fail");
// Show error.
},
Help = (BiometricAcquiredStatus helpCode, ICharSequence helpString) => {
//below BiometricAcquiredStatus falls here
//BiometricAcquiredStatus.ImagerDirty;
//BiometricAcquiredStatus.Insufficient;
//BiometricAcquiredStatus.Partial;
//BiometricAcquiredStatus.TooFast;
//BiometricAcquiredStatus.TooSlow;//
}
};
return(callback);
}
