google_calendar_client.py

import argparse
import logging
import os
import sys

import httplib2
from apiclient import discovery
from googleapiclient.errors import HttpError
from oauth2client import client
from oauth2client import tools
from oauth2client.clientsecrets import InvalidClientSecretsError
from oauth2client.file import Storage

try:
    flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
    flags = None

SCOPES = 'https://www.googleapis.com/auth/calendar'
CLIENT_SECRET_FILE = 'google-calendar-client-secret.json'
APPLICATION_NAME = 'Google Calendar API Python Quickstart'


class GoogleCalendar:

    def __init__(self, calendar_id):
        """Gets valid user credentials from storage.

        If nothing has been stored, or if the stored credentials are invalid,
        the OAuth2 flow is completed to obtain the new credentials.

        Returns:
            Credentials, the obtained credential.
        """
        home_dir = os.path.expanduser('~')
        credential_dir = os.path.join(home_dir, '.config/bamboohr')
        if not os.path.exists(credential_dir):
            os.makedirs(credential_dir)
        credential_path = os.path.join(credential_dir, 'google-calendar.json')

        store = Storage(credential_path)
        credentials = store.get()
        if not credentials or credentials.invalid:
            try:
                flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
                flow.user_agent = APPLICATION_NAME
                if flags:
                    credentials = tools.run_flow(flow, store, flags)
                else:  # Needed only for compatibility with Python 2.6
                    credentials = tools.run(flow, store)
                print('Storing credentials to ' + credential_path)
            except InvalidClientSecretsError:
                sys.exit("File not found: " + CLIENT_SECRET_FILE + ". You need to create a GCP app to access the Google Calendar APIs. Follow instructions at https://github.com/agentgonzo/bamboohr-google-calendar-sync#Prerequisites")
        http = credentials.authorize(httplib2.Http())
        self.events = discovery.build('calendar', 'v3', http=http).events()
        self.calendar_id = calendar_id

    def update_event(self, id, start, end, status, summary, description):
        """Shows basic usage of the Google Calendar API.

        Creates a Google Calendar API service object and outputs a list of the next
        10 events on the user's calendar.
        """
        event = {
            'id': id,
            'start': {'date': start},
            'end': {'date': end},
            'summary': summary,
            'description': description,
            'status': status
        }
        try:
            self.events.patch(eventId=id, calendarId=self.calendar_id, body=event).execute()
        except HttpError as e:
            logging.info('Could not patch event, trying to create instead')
            self.events.insert(calendarId=self.calendar_id, body=event).execute()


if __name__ == '__main__':
    GoogleCalendar('k7u1kb46aja6i0ue67etm0u2fk@group.calendar.google.com') \
        .update_event('1234567', '2018-02-26', '2018-02-26', 'confirmed', 'Summary', 'Desc')