package op

import (
	"errors"

	"gopkg.in/square/go-jose.v2"
)

var (
	ErrSignerCreationFailed = errors.New("signer creation failed")
)

type SigningKey interface {
	SignatureAlgorithm() jose.SignatureAlgorithm
	Key() interface{}
	ID() string
}

func SignerFromKey(key SigningKey) (jose.Signer, error) {
	signer, err := jose.NewSigner(jose.SigningKey{
		Algorithm: key.SignatureAlgorithm(),
		Key: &jose.JSONWebKey{
			Key:   key.Key(),
			KeyID: key.ID(),
		},
	}, &jose.SignerOptions{})
	if err != nil {
		return nil, ErrSignerCreationFailed //TODO: log / wrap error?
	}
	return signer, nil
}

type Key interface {
	ID() string
	Algorithm() jose.SignatureAlgorithm
	Use() string
	Key() interface{}
}