Static is a module containg static type definitions, which are not dependent on Auth_sign.MODEL

VARIABLES is a module which inits and holds field variables for authentication

Session_manager contains

Authenticator is module which provides functions both for authentication and logout

Router is a module which contains handlers for authentication and creates routes for them.

Make_Auth creates a module based on Auth_sign.MODEL. Provides local variables, middlewares and authenticator to run authentication strategies.

Auth_sign is a module containig signatures for modules which can be implemented and integrated from outside the lib, as well as signatures for some inner modules.