code: func newAuthenticatorFromTokenFile(tokenAuthFile string) (authenticator.Token, error) {
  	tokenAuthenticator, err := tokenfile.NewCSV(tokenAuthFile)
  	if err != nil {
  		return nil, err
  	}
  
  	return tokenAuthenticator, nil
  }
docs: // newAuthenticatorFromTokenFile returns an authenticator.Token or an error