code: func newAuthenticatorFromBasicAuthFile(basicAuthFile string) (authenticator.Request, error) {
  	basicAuthenticator, err := passwordfile.NewCSV(basicAuthFile)
  	if err != nil {
  		return nil, err
  	}
  
  	return basicauth.New(basicAuthenticator), nil
  }
docs: // newAuthenticatorFromBasicAuthFile returns an authenticator.Request or an error