paseto_maker.go

package token

import (
	"fmt"
	"github.com/aead/chacha20poly1305"
	"github.com/o1egl/paseto"
)

type PasetoMaker struct {
	paseto       *paseto.V2
	symmetricKey []byte
}

func NewPasetoMaker(symmetricKey string) (Maker, error) {

	if len(symmetricKey) != chacha20poly1305.KeySize {
		return nil, fmt.Errorf("invalid key size : must be exactly %d characters", chacha20poly1305.KeySize)
	}

	maker := &PasetoMaker{paseto: paseto.NewV2(), symmetricKey: []byte(symmetricKey)}
	return maker, nil
}

// CreateToken creates a new token for a specific username and duration
func (maker *PasetoMaker) CreateToken(payload Payloads, opt ...interface{}) (string, error) {
	return maker.paseto.Encrypt(maker.symmetricKey, payload, opt)

}

// VerifyToken checks if the token is valid or not
func (maker *PasetoMaker) VerifyToken(token string) (*Payload, error) {
	payload := &Payload{}
	err := maker.paseto.Decrypt(token, maker.symmetricKey, payload, nil)
	if err != nil {
		return nil, ErrInvalidToken
	}

	err = payload.Valid()
	if err != nil {
		return nil, err
	}
	return payload, nil
}