func NewPolicySys() *PolicySys {
	return &PolicySys{}
}

func getSTSConditionValues(r *http.Request, lc string, cred auth.Credentials) map[string][]string {
	m := make(map[string][]string)
	if d := r.Form.Get("DurationSeconds"); d != "" {
		m["DurationSeconds"] = []string{d}
	}
	return m
}

func getConditionValues(r *http.Request, lc string, cred auth.Credentials) map[string][]string {
	currTime := UTCNow()

	var (