Go JWT token

Go JWT token

生成token

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

func GenerateJWT(username string) (string, error) {
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
		"username": username,
		"exp":      time.Now().Add(time.Hour * 72).Unix(),
	})

	signedToken, err := token.SignedString([]byte("secret"))
	return "Bearer " + signedToken, err
}

解析token

func ParseJWT(tokenString string) (string, error) {
	if len(tokenString) > 7 && tokenString[:7] == "Bearer " {
		tokenString = tokenString[7:]
	}

	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, errors.New("unexpected Signing Method")
		}
		return []byte("secret"), nil
	})

	if err != nil {
		return "", err
	}

	if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
		username, ok := claims["username"].(string)
		if !ok {
			return "", errors.New("username claim is not a string")
		}
		return username, nil
	}

	return "", err
}