payload.go

func encodeJSON(x interface{}) (b []byte, e error) {
	buf := bytes.NewBufferString("")
	enc := json.NewEncoder(buf)

	if e = enc.Encode(x); e == nil {
		b = buf.Bytes()
	}

	return
}

func (p *Payload) MarshalJSON() ([]byte, error) {
	t := make(map[string]interface{})

	for k, v := range *p.Values {
		switch len(v) {
		case 1:
			t[k] = v[0]
		case 0:
		default:
			t[k] = v
		}
	}

	if len(p.Payload) > 0 {
		t["Payload"] = p.Payload
	}

	return encodeJSON(t)
}

func (p *Payload) JSONEncode() (r string, e error) {
	s, e := encodeJSON(p)

	if e == nil {
		r = string(s)
	}

	return
}