How do I find a Google user's ID without the user logging in, in advance?

Question

I don't where to ask questions at https://developers.google.com/identity/ so I am asking here.

I've been tinkering with using Google as an authentication provider. I've setup my app with:

GOOGLE_CLIENT_ID
GOOGLE_CLIENT_SECRET

Though now I'm interested in assigning admin permissions in my test code to other Google users identified by email address. How do I know what the ID is of say example@gmail.com so I can add that person to an admin list?

I don't want the user to login first to figure out their 21 digit ID!

So you want to know what a user's Google ID is based on their email before they log into your program. Is that right? — Rob, May 23 '19 at 02:47

score 1 · Answer 1 · edited Jun 21 '19 at 00:24

1

There is no way for you to search on a google email address and get any information about that user including their Google user id. This would have a large number of security ramifications in my opinion.

You need to have the user login then you can use the user info endpoint to get back the information you need.

edited Jun 21 '19 at 00:24

André Tzermias

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answered May 23 '19 at 07:29

Linda Lawton - DaImTo

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How do I find a Google user's ID without the user logging in, in advance?

1 Answers1