JWT GenToken&ParseToken

JWT(Json Web Token)

获取Token、解密Token

jwt.go

package jwt

import (
	"errors"
	"time"

	"github.com/golang-jwt/jwt/v5"
)

var jwtSecret = []byte("secret")

type CustomClaims struct {
	Username string `json:"username"`
	jwt.RegisteredClaims
}

func GenToken(username string) (string, error) {
	claims := CustomClaims{
		Username: username,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(2 * time.Hour)), // 过期时间
			IssuedAt:  jwt.NewNumericDate(time.Now()),                    // 签发时间
			NotBefore: jwt.NewNumericDate(time.Now()),                    // 生效时间
			Issuer:    "bluebell-app",                                    // 签发人
			Subject:   "user-token",                                      // token主题
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString(jwtSecret)
}

func ParseToken(tokenString string) (*CustomClaims, error) {
	token, err := jwt.ParseWithClaims(tokenString, &CustomClaims{}, func(token *jwt.Token) (interface{}, error) {
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, errors.New("unexpected signing method")
		}
		return jwtSecret, nil
	})

	if err != nil {
		return nil, err
	}

	if claims, ok := token.Claims.(*CustomClaims); ok && token.Valid {
		return claims, nil
	}

	return nil, errors.New("invalid token")
}