packages/google_sign_in/google_sign_in_platform_interface/lib/src/method_channel_google_sign_in.dart

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'package:flutter/services.dart';
import 'package:meta/meta.dart' show required, visibleForTesting;

import '../google_sign_in_platform_interface.dart';
import 'types.dart';
import 'utils.dart';

/// An implementation of [GoogleSignInPlatform] that uses method channels.
class MethodChannelGoogleSignIn extends GoogleSignInPlatform {
  /// This is only exposed for test purposes. It shouldn't be used by clients of
  /// the plugin as it may break or change at any time.
  @visibleForTesting
  MethodChannel channel =
      const MethodChannel('plugins.flutter.io/google_sign_in');

  @override
  Future<void> init(
      {@required String hostedDomain,
      List<String> scopes = const <String>[],
      SignInOption signInOption = SignInOption.standard,
      String clientId}) {
    return channel.invokeMethod<void>('init', <String, dynamic>{
      'signInOption': signInOption.toString(),
      'scopes': scopes,
      'hostedDomain': hostedDomain,
    });
  }

  @override
  Future<GoogleSignInUserData> signInSilently() {
    return channel
        .invokeMapMethod<String, dynamic>('signInSilently')
        .then(getUserDataFromMap);
  }

  @override
  Future<GoogleSignInUserData> signIn() {
    return channel
        .invokeMapMethod<String, dynamic>('signIn')
        .then(getUserDataFromMap);
  }

  @override
  Future<GoogleSignInTokenData> getTokens(
      {String email, bool shouldRecoverAuth = true}) {
    return channel
        .invokeMapMethod<String, dynamic>('getTokens', <String, dynamic>{
      'email': email,
      'shouldRecoverAuth': shouldRecoverAuth,
    }).then(getTokenDataFromMap);
  }

  @override
  Future<void> signOut() {
    return channel.invokeMapMethod<String, dynamic>('signOut');
  }

  @override
  Future<void> disconnect() {
    return channel.invokeMapMethod<String, dynamic>('disconnect');
  }

  @override
  Future<bool> isSignedIn() {
    return channel.invokeMethod<bool>('isSignedIn');
  }

  @override
  Future<void> clearAuthCache({String token}) {
    return channel.invokeMethod<void>(
      'clearAuthCache',
      <String, String>{'token': token},
    );
  }

  @override
  Future<bool> requestScopes(List<String> scopes) {
    return channel.invokeMethod<bool>(
      'requestScopes',
      <String, List<String>>{'scopes': scopes},
    );
  }
}