Check & Fetch the user if exists

Question

When using AWS Appstream API, How do we check if a username(email) exists? And on a similar note how do we fetch that user by username?

I tried searching here on the official docs and while there are methods for creation, deletion, enabling, disabling users but there seems to be no specific method provided to fetch a user from the user pool.

Answer 1

Update: As of now we have a DescribeUsers method, but again this is for fetching all (filterable) users but still we shall have to process all of the results to confirm a user is present or not.

==================================================

For the time being it seems the only band-aid solution is to fire a createUser() request with that username and look for the exception named ResourceAlreadyExistsException. But for all intents and purposes this feels tacky.

_{So for want of better alternative this is the solution, once we have something better, I'll mark that answer as selected, or maybe even update this answer if I get it before others.}