Is it possible to get full code of Identity from GitHub?

Hi,

I have the self hosted Bitwarden ,which is deployed in our local server.

I want to modify the server side code for the request https://identity.bitwarden.com/connect/token,which is for login action of browser extension.

where can I find the C# code from the downloaded server module?

I find that in the downloaded code ,the Identity folder is with less code.

Thanks a lot!