yubioath-flutter/lib/android/qr_scanner/qr_scanner_provider.dart

/*
 * Copyright (C) 2022 Yubico.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:yubico_authenticator/app/state.dart';
import 'package:yubico_authenticator/cancellation_exception.dart';
import 'package:yubico_authenticator/theme.dart';

import 'qr_scanner_view.dart';

class AndroidQrScanner implements QrScanner {
  final WithContext _withContext;
  AndroidQrScanner(this._withContext);

  @override
  Future<String?> scanQr([String? _]) async {
    var scannedCode = await _withContext(
        (context) async => await Navigator.of(context).push(PageRouteBuilder(
              pageBuilder: (_, __, ___) =>
                  Theme(data: AppTheme.darkTheme, child: const QrScannerView()),
              transitionDuration: const Duration(seconds: 0),
              reverseTransitionDuration: const Duration(seconds: 0),
            )));
    if (scannedCode == null) {
      // user has cancelled the scan
      throw CancellationException();
    }
    if (scannedCode == '') {
      return null;
    }
    return scannedCode;
  }
}

final androidQrScannerProvider = Provider.family<QrScanner?, bool>(
    (ref, hasCamera) =>
        hasCamera ? AndroidQrScanner(ref.watch(withContextProvider)) : null);