golang 获取token方法

package main

import (

	"fmt"

	"time"

	"github.com/dgrijalva/jwt-go"

)

const (

	SECRETKEY = "202203021124355xxx" //私钥

)

// 自定义 Claims

type CustomClaims struct {

	UserId int64

	jwt.StandardClaims

}

func main() {

	//生成 token

	maxAge := 60 * 60 * 24

	customClaims := &CustomClaims{

		UserId: 11, //用户 id

		StandardClaims: jwt.StandardClaims{

			ExpiresAt: time.Now().Add(time.Duration(maxAge) * time.Second).Unix(), // 过期时间，必须设置

			Issuer:    "root",                                                     // 非必须，也可以填充用户名，

		},

	}

	//采用 HMAC SHA256 加密算法

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, customClaims)

	tokenString, err := token.SignedString([]byte(SECRETKEY))

	if err != nil {

		fmt.Println(err)

	}

	fmt.Printf("token: %v\n", tokenString)

	fmt.Println("Token=====", tokenString)

	//解析 token

	ret, err := ParseToken(tokenString)

	if err != nil {

		fmt.Println(err)

	}

	fmt.Printf("userinfo: %v\n", ret)

	fmt.Println("====创建时间", ret.ExpiresAt)

}

// 解析 token

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, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])

		}

		return []byte(SECRETKEY), nil

	})

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

		return claims, nil

	} else {

		return nil, err

	}

}