token 管理 -- golang-jwt

项目地址：
https://github.com/golang-jwt/jwt

用法：

 package main

 import (
     "fmt"
     "github.com/golang-jwt/jwt"
     "time"
 )

 // 生成
 func GenerateToken(encryptKey string, expireHours, uid int) (string, error) {
     expire := time.Duration(expireHours)
     exp := time.Now().Add(time.Hour * expire).Unix()
     token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
         "uid": uid,
         "exp": exp,
     })
     tokenString, err := token.SignedString([]byte(encryptKey))
     return tokenString, err
 }

 // 解析
 func ParseToken(encryptKey, tokenString string) (int, bool) {
     token, err := jwt.Parse(tokenString, 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(encryptKey), nil
     })
     if err != nil {
         return 0, false
     }
     if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
         if uid, ok := claims["uid"].(float64); ok {
             return int(uid), true
         } else {
             return 0, false
         }
     } else {
         return 0, false
     }
 }
 func main() {
     encryptKey := "test key"
     if token, err := GenerateToken(encryptKey, 1, 100); err != nil {
         fmt.Println(err)
     } else {
         fmt.Println(token)
         uid, ok := ParseToken(encryptKey, token)
         fmt.Println(uid, ok)
     }
 }
 // 输出
 eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE2ODU3NzUzNDAsInVpZCI6MTAwfQ.EeRMRHXQmPXCaJVIETXV0YyFeQPCVThUQgoP6mgaEnc
100 true