code: func StaticAuthenticator(username, password, otp string, user *empire.User) Authenticator {
  	return AuthenticatorFunc(func(givenUsername, givenPassword, givenOtp string) (*Session, error) {
  		if givenUsername != username {
  			return nil, ErrForbidden
  		}
  
  		if givenPassword != password {
  			return nil, ErrForbidden
  		}
  
  		if givenOtp != otp {
  			return nil, ErrTwoFactor
  		}
  
  		return NewSession(user), nil
  	})
  }
docs: // StaticAuthenticator returns an Authenticator that returns the provided user
  // when the given credentials are provided.