/// <summary>
/// Gets the device's current biometric capabilities.
/// </summary>
/// <returns>A <see cref="BiometryCapabilities" /> struct instance.</returns>
public Task <BiometryCapabilities> GetCapabilities()
{
bool _isEnabled = false;
switch (_biometricManager.CanAuthenticate(BiometricManager.Authenticators.BiometricStrong))
{
case BiometricManager.BiometricSuccess:
_isEnabled = true;
break;
case BiometricManager.BiometricErrorNoHardware:
_isEnabled = false;
break;
case BiometricManager.BiometricErrorNoneEnrolled:
_isEnabled = false;
break;
case BiometricManager.BiometricErrorSecurityUpdateRequired:
_isEnabled = false;
break;
default:
break;
}
bool devicePinAvailable = Convert.ToBoolean(_biometricManager.CanAuthenticate(BiometricManager.Authenticators.DeviceCredential));
return(Task.Run(() =>
{
return new BiometryCapabilities(BiometryType.FaceOrFingerprint, _isEnabled, devicePinAvailable);
}));
}
private FingerprintAvailability GetBiometricAvailability()
{
var context = Application.Context;
if (context.CheckCallingOrSelfPermission(Manifest.Permission.UseBiometric) != Permission.Granted &&
context.CheckCallingOrSelfPermission(Manifest.Permission.UseFingerprint) != Permission.Granted)
{
return(FingerprintAvailability.NoPermission);
}
var result = _manager.CanAuthenticate();
switch (result)
{
case BiometricManager.BiometricErrorNoHardware:
return(FingerprintAvailability.NoSensor);
case BiometricManager.BiometricErrorHwUnavailable:
return(FingerprintAvailability.Unknown);
case BiometricManager.BiometricErrorNoneEnrolled:
return(FingerprintAvailability.NoFingerprint);
case BiometricManager.BiometricSuccess:
return(FingerprintAvailability.Available);
}
return(FingerprintAvailability.Unknown);
}
public FingerprintService(
FragmentActivity fragmentActivity,
Context applicationContext,
IObservable <Unit> applicationActivated,
CoreDispatcher dispatcher,
IScheduler backgroundScheduler,
FuncAsync <BiometricPrompt.PromptInfo> promptInfoBuilder)
{
fragmentActivity.Validation().NotNull(nameof(fragmentActivity));
applicationActivated.Validation().NotNull(nameof(applicationActivated));
backgroundScheduler.Validation().NotNull(nameof(backgroundScheduler));
_dispatcher = dispatcher ?? throw new ArgumentNullException(nameof(dispatcher));
_promptInfoBuilder = promptInfoBuilder ?? throw new ArgumentNullException(nameof(promptInfoBuilder));
var executor = ContextCompat.GetMainExecutor(applicationContext);
var callback = new AuthenticationCallback(OnAuthenticationSucceeded, OnAuthenticationFailed, OnAuthenticationError);
_BiometricPrompt = new BiometricPrompt(fragmentActivity, executor, callback);
_BiometricManager = BiometricManager.From(Application.Context);
_keyStore = KeyStore.GetInstance(ANDROID_KEYSTORE);
_keyStore.Load(null);
_canAuthenticate =
applicationActivated
.ObserveOn(backgroundScheduler)
.StartWith(backgroundScheduler, Unit.Default)
.Select(_ => _BiometricManager.CanAuthenticate())
.Replay(1, backgroundScheduler)
.RefCount();
}
