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jwt.go
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jwt.go
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package jwt
import (
"errors"
"fmt"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/geisonbiazus/blog/internal/core/auth"
)
type TokenEncoder struct {
secret []byte
}
func NewTokenEncoder(secret string) *TokenEncoder {
return &TokenEncoder{secret: []byte(secret)}
}
func (m *TokenEncoder) Encode(value string, expiresIn time.Duration) (string, error) {
claims := newClaims(value, expiresIn)
t := jwt.NewWithClaims(jwt.SigningMethodHS512, claims)
signedToken, err := t.SignedString(m.secret)
if err != nil {
return "", fmt.Errorf("error signing string on jwt.TokenManager: %w", err)
}
return signedToken, nil
}
func (m *TokenEncoder) Decode(token string) (string, error) {
t, err := jwt.ParseWithClaims(token, &jwtClaims{}, func(t *jwt.Token) (interface{}, error) {
if t.Method.Alg() != jwt.SigningMethodHS512.Alg() {
return nil, ErrInvalidSigningAlgorithm
}
return m.secret, nil
})
if err != nil {
return "", m.handleDecodingError(err)
}
claims := t.Claims.(*jwtClaims)
return claims.Subject, nil
}
func (m *TokenEncoder) handleDecodingError(err error) error {
if strings.Contains(err.Error(), "token is expired") {
return auth.ErrTokenExpired
}
return fmt.Errorf("error parsing token on jwt.TokenManager: %w", err)
}
var ErrInvalidSigningAlgorithm = errors.New("invalid JWT signing algorithm")
type jwtClaims struct {
jwt.StandardClaims
}
func newClaims(sub string, expiresIn time.Duration) *jwtClaims {
return &jwtClaims{
StandardClaims: jwt.StandardClaims{
Subject: sub,
ExpiresAt: expiresAt(expiresIn),
},
}
}
func expiresAt(expiresIn time.Duration) int64 {
return time.Now().Add(expiresIn).Unix()
}