Where I can find codebase for auth API

Where I can find code base for the api in openemr
http://localhost/apis/api/auth
Unable to locate the codebase here GitHub - openemr/openemr: OpenEMR is the most popular open source electronic health records and medical practice management solution. OpenEMR's goal is a superior alternative to its proprietary counterparts.
Can anyone help me out

hi @Rashi, here’s the readme

Hi Stephen,
Thanks for your reply.I have already read this README file but unable to locate code file where the logic is written as I need to customized the response. Can you help me in locating that.

No longer is an endpoint. We now support oauth2 and openid connect as the readme points out.
I can think of no reason to change any request results for authentication requests.

The resource/dispatch server sits at openemr/apis with authorization server at openemr/oauth2 and classes are in openemr/src