What is the REST (or CLI) API for logging in to Amazon Cognito user pools

Question

How do i make logins happen via Amazon Cognito REST APIs (for user pools) on platforms for which there is no official SDK? - Note that i am asking

Answer 1

I have a similar problem and was wondering how to integrate Cognito within an Elixir backend and found this library: https://github.com/aws-beam/aws-elixir

From what I can understand by reading its source code, they ultimately make a POST request that contains the header "X-Amz-Target": "AWSCognitoIdentityProviderService.#{name_of_api_action}" (this is here: https://github.com/aws-beam/aws-elixir/blob/master/lib/aws/cognito_identity_provider.ex#L564). That's without the authorization headers, they are added elsewhere, but I found it interesting. The functions that construct the request URL are following, so you should be able to get an idea of the endpoint that gets called.

I must say I tried following this article written in Japanese - https://qiita.com/yujikawa/items/e79929ed14277102f4b8, and couldn't manage to make it work, maybe because I was not sure what the proper AWS_ENDPOINT environment variable should be. I am currently thinking of trying out the Ruby SDK, from the looks of the documentation it seems fine. But, nonetheless, this information may still help someone.