问题
I'm writing an application for limited amount of users and logging to app is designed only via google accounts. Now I need to add functionality of adding permissions of accessing app based on email address. Problem is, on the database level, verification of permission to access app is based on Google ID. Since Google ID is more of less not a secret information, is there a way how to get Google ID of account based on email address, without actually logging in with this account?
来源：https://stackoverflow.com/questions/43279442/google-account-id-by-account-email