authenticate method
- required String localizedReason,
- bool useErrorDialogs = true,
- bool stickyAuth = false,
- AndroidAuthMessages androidAuthStrings = const AndroidAuthMessages(),
- IOSAuthMessages iOSAuthStrings = const IOSAuthMessages(),
- bool sensitiveTransaction = true,
- bool biometricOnly = false,
Authenticates the user with biometrics available on the device while also allowing the user to use device authentication - pin, pattern, passcode.
Returns a Future holding true, if the user successfully authenticated, false otherwise.
localizedReason
is the message to show to user while prompting them
for authentication. This is typically along the lines of: 'Please scan
your finger to access MyApp.'. This must not be empty.
useErrorDialogs
= true means the system will attempt to handle user
fixable issues encountered while authenticating. For instance, if
fingerprint reader exists on the phone but there's no fingerprint
registered, the plugin will attempt to take the user to settings to add
one. Anything that is not user fixable, such as no biometric sensor on
device, will be returned as a PlatformException.
stickyAuth
is used when the application goes into background for any
reason while the authentication is in progress. Due to security reasons,
the authentication has to be stopped at that time. If stickyAuth is set
to true, authentication resumes when the app is resumed. If it is set to
false (default), then as soon as app is paused a failure message is sent
back to Dart and it is up to the client app to restart authentication or
do something else.
Construct AndroidAuthStrings
and IOSAuthStrings
if you want to
customize messages in the dialogs.
Setting sensitiveTransaction
to true enables platform specific
precautions. For instance, on face unlock, Android opens a confirmation
dialog after the face is recognized to make sure the user meant to unlock
their phone.
Setting biometricOnly
to true prevents authenticates from using non-biometric
local authentication such as pin, passcode, and passcode.
Throws an PlatformException if there were technical problems with local authentication (e.g. lack of relevant hardware). This might throw PlatformException with error code otherOperatingSystem on the iOS simulator.
Implementation
Future<bool> authenticate({
required String localizedReason,
bool useErrorDialogs = true,
bool stickyAuth = false,
AndroidAuthMessages androidAuthStrings = const AndroidAuthMessages(),
IOSAuthMessages iOSAuthStrings = const IOSAuthMessages(),
bool sensitiveTransaction = true,
bool biometricOnly = false,
}) async {
assert(localizedReason.isNotEmpty);
final Map<String, Object> args = <String, Object>{
'localizedReason': localizedReason,
'useErrorDialogs': useErrorDialogs,
'stickyAuth': stickyAuth,
'sensitiveTransaction': sensitiveTransaction,
'biometricOnly': biometricOnly,
};
if (_platform.isIOS) {
args.addAll(iOSAuthStrings.args);
} else if (_platform.isAndroid) {
args.addAll(androidAuthStrings.args);
} else {
throw PlatformException(
code: otherOperatingSystem,
message: 'Local authentication does not support non-Android/iOS '
'operating systems.',
details: 'Your operating system is ${_platform.operatingSystem}',
);
}
return (await _channel.invokeMethod<bool>('authenticate', args)) ?? false;
}