package hmac

import (
	baseHmac "crypto/hmac"
	"crypto/sha256"
	"encoding/base64"
	"encoding/hex"
)

var _ HMAC = (*hmac)(nil)

type HMAC interface {
	i()

	Sha256ToString(data string) string
	Sha256ToBase64String(data string) string
}

type hmac struct {
	secret string
}

func New(secret string) HMAC {
	return &hmac{secret: secret}
}

func (m *hmac) i() {}

func (m *hmac) Sha256ToString(data string) string {
	h := baseHmac.New(sha256.New, []byte(m.secret))
	h.Write([]byte(data))
	return hex.EncodeToString(h.Sum(nil))
}

func (m *hmac) Sha256ToBase64String(data string) string {
	h := baseHmac.New(sha256.New, []byte(m.secret))
	h.Write([]byte(data))
	return base64.StdEncoding.EncodeToString(h.Sum(nil))
}