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nfc_provider.dart
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nfc_provider.dart
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// Created by Crt Vavros, copyright © 2022 ZeroPass. All rights reserved.
import 'dart:io';
import 'dart:typed_data';
import 'package:dmrtd/dmrtd.dart';
import 'package:dmrtd/extensions.dart';
import 'package:logging/logging.dart';
import 'package:flutter_nfc_kit/flutter_nfc_kit.dart';
enum NfcStatus { notSupported, disabled, enabled }
class NfcProviderError extends ComProviderError {
NfcProviderError([String message = ""]) : super(message);
NfcProviderError.fromException(Exception e) : super(e.toString());
@override
String toString() => 'NfcProviderError: $message';
}
class NfcProvider extends ComProvider {
static final _log = Logger('nfc.provider');
Duration timeout = const Duration(seconds: 10); /// [Android] Default timeout.
NfcProvider() : super(_log);
NFCTag? _tag;
/// On iOS, sets NFC reader session alert message.
Future<void> setIosAlertMessage(String message) async {
if (Platform.isIOS) {
return await FlutterNfcKit.setIosAlertMessage(message);
}
}
static Future<NfcStatus> get nfcStatus async {
NFCAvailability a = await FlutterNfcKit.nfcAvailability;
switch (a) {
case NFCAvailability.disabled:
return NfcStatus.disabled;
case NFCAvailability.available:
return NfcStatus.enabled;
default:
return NfcStatus.notSupported;
}
}
@override
Future<void> connect({Duration? timeout, String iosAlertMessage = "Hold your iPhone near the biometric Passport"}) async {
if (isConnected()) {
return;
}
try {
_tag = await FlutterNfcKit.poll(
timeout: timeout ?? this.timeout,
iosAlertMessage: iosAlertMessage,
readIso14443A: true,
readIso14443B: true,
readIso18092: false,
readIso15693: false);
if (_tag!.type != NFCTagType.iso7816) {
_log.info("Ignoring non ISO-7816 tag: ${_tag!.type}");
return await disconnect();
}
} on Exception catch (e) {
throw NfcProviderError.fromException(e);
}
}
@override
Future<void> disconnect(
{String? iosAlertMessage, String? iosErrorMessage}) async {
if (isConnected()) {
_log.debug("Disconnecting");
try {
_tag = null;
return await FlutterNfcKit.finish(
iosAlertMessage: iosAlertMessage, iosErrorMessage: iosErrorMessage);
} on Exception catch(e) {
throw NfcProviderError.fromException(e);
}
}
}
@override
bool isConnected() {
return _tag != null;
}
@override
Future<Uint8List> transceive(final Uint8List data,
{Duration? timeout}) async {
try {
return await FlutterNfcKit.transceive(data, timeout: timeout ?? this.timeout);
} on Exception catch(e) {
throw NfcProviderError.fromException(e);
}
}
}