How to api call of google calendar in flutter

기록용으로 메모해 두어요. 

먼저 Firebase google login 이 구현이 되어있다고 가정하고, 진행 할게요. 

만약 Firebase google login이 설정이 되어있지 않다면, 다른 분들의 글에서 참고해서 셋팅해주세요.

 

1. google api 라이브러리 설치

pubspec.yaml

googleapis: ^13.1.0

 

2. 전체 코드 

import 'dart:async';

import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:signal/core/core.dart';
import 'package:googleapis/calendar/v3.dart' as calendar;
import 'package:http/http.dart' as http;

class GoogleCalendarTest {
  Future<void> callCalendarAPI() async {
  ///scopes에 요청할 권한을 미리 정의해 주어야 해요!!!!
    final GoogleSignIn googleSignIn = GoogleSignIn(
      scopes: [
        calendar.CalendarApi.calendarScope,
        calendar.CalendarApi.calendarReadonlyScope,
      ],
    );
    final GoogleSignInAccount? googleUser = await googleSignIn.signIn();
    if (googleUser == null) {
      Logger.log('Google Sign In Fail');
      return;
    }
    final googleAuth = await googleUser.authentication;
    final credential = GoogleAuthProvider.credential(
      accessToken: googleAuth.accessToken,
      idToken: googleAuth.idToken,
    );
    http.Client client = http.Client();
    final authHeaders = {
      'Authorization': 'Bearer ${credential.accessToken}',
    };

    final baseClient = AuthenticatedClient(client, authHeaders);
    final calendarApi = calendar.CalendarApi(baseClient);
    final calendarListResource = calendarApi.calendarList;
    final calendarList = await calendarListResource.list();
    calendarList.items?.forEach((element) {
      Logger.log('Calendar Id: ${element.id}');
    });
    final events = await calendarApi.events.list(calendarList.items?.firstOrNull?.id ?? 'primary');
    events.items?.forEach((element) {
      Logger.log('element.summary: ${element.summary}, date: ${element.start?.dateTime}');
    });

    return Future.value();
  }
}

class AuthenticatedClient extends http.BaseClient {
  final http.Client _inner;
  final Map<String, String> _headers;

  AuthenticatedClient(this._inner, this._headers);

  @override
  Future<http.StreamedResponse> send(http.BaseRequest request) {
    return _inner.send(request..headers.addAll(_headers));
  }
}

 

3. 실행

///테스트 코드
void run() async {
  GoogleCalendarTest().callCalendarAPI();
}