Setting up a subscriber to changes in a Google folder

gdrive_service.py

# python 3.7.4

import json
import datetime  # for the expiration property: a date string to epoch millisec
import uuid  # for the id property

from apiclient import discovery
from google.oauth2 import service_account

try:
    ep = lambda year, month, day, hour, min: int(
        datetime.datetime(year, month, day, hour, min).timestamp()
    )
    API = "drive"
    API_VERSION = "v3"  # from "v3"
    scopes = [
        "https://www.googleapis.com/auth/drive",
        "https://www.googleapis.com/auth/drive.file",
    ]
    with open("client_servacc.json", "r") as read_file:
        serv_acct_info = json.load(read_file)

    # this needs to change to get credentials from a string object instead of a file
    # https://google-auth.readthedocs.io/en/latest/reference/google.oauth2.service_account.html
    # in preparation for AWS SSM storage
    credentials = service_account.Credentials.from_service_account_info(
        serv_acct_info, scopes=scopes
    )

    drive_service = discovery.build(API, API_VERSION, credentials=credentials)

    folderId = "<the Google folder id>"

    # request body
    data = {
        "id": str(uuid.uuid4()),
        "type": "web_hook",
        "address": "<the URL to use to receive notifications, must be SSL certified",
        "expiration": ep(2019, 10, 31, 6, 0),
    }

    response = drive_service.files().watch(fileId=folderId, body=data).execute()
    print(response)

    # sample successful request response
    # https://developers.google.com/drive/api/v3/reference/files/watch?authuser=0#response_1

except OSError as e:
    print(e)