private AuthenticateResponse Authenticate(AuthenticateRequest authenticateRequest)
{
var user = users.SingleOrDefault(x => x.Username == authenticateRequest.Username && x.Password == authenticateRequest.Password);
// return null if user not found
if (user == null)
{
return(null);
}
// authentication successful so generate jwt token
var token = AuthJWT.generateJwtToken(user);
return(new AuthenticateResponse(user, token));
}