Google calendar service

gcal.py

import datetime
import config
import pickle
import os.path
from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request

# If modifying these scopes, delete the file token.pickle.
SCOPES = ['https://www.googleapis.com/auth/calendar']

def get_calendar_service():
	creds = None
	if os.path.exists("gcal_token.pickle"):
		with open("gcal_token.pickle", 'rb') as token:
			creds = pickle.load(token)
	# If there are no (valid) credentials available, let the user log in.
	if not creds or not creds.valid:
		if creds and creds.expired and creds.refresh_token:
			creds.refresh(Request())
		else:
			flow = InstalledAppFlow.from_client_secrets_file("gcal_client_secret.googleusercontent.com.json", SCOPES)
			creds = flow.run_local_server(port=0)

		with open("gcal_token.pickle", 'wb') as token:
			pickle.dump(creds, token)

	service = build('calendar', 'v3', credentials=creds)
	return service