通过jwt基于token实现登陆认证通过jwt基于token实现登陆认证

package main
import (
    "fmt"
    "net/http"
    "time"
    "github.com/dgrijalva/jwt-go"
    "github.com/gin-gonic/gin"
)
//自定义一个字符串
var jwtkey = []byte("eryajf.net")
var str string
type Claims struct {
    UserId uint
    jwt.StandardClaims
}
func main() {
    r := gin.Default()
    r.GET("/set", setting)
    r.GET("/get", getting)
    //监听端口默认为8080
    r.Run(":8080")
}
//颁发token
func setting(ctx *gin.Context) {
    expireTime := time.Now().Add(7 * 24 * time.Hour)
    claims := &Claims{
        UserId: 2,
        StandardClaims: jwt.StandardClaims{
            ExpiresAt: expireTime.Unix(), //过期时间
            IssuedAt:  time.Now().Unix(),
            Issuer:    "127.0.0.1",  // 签名颁发者
            Subject:   "user token", //签名主题
        },
    }
    token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
    // fmt.Println(token)
    tokenString, err := token.SignedString(jwtkey)
    if err != nil {
        fmt.Println(err)
    }
    // str = tokenString
    ctx.JSON(http.StatusOK, gin.H{"code": 200, "token": tokenString})
}
//解析token
func getting(ctx *gin.Context) {
    tokenString := ctx.GetHeader("Authorization") //从header中取Authorization这个key，再与刚刚的token进行比对
    // 先判断取到的是否为空，为空则跳出
    if tokenString == "" {
        ctx.JSON(http.StatusUnauthorized, gin.H{"code": 401, "msg": "权限不足"})
        ctx.Abort()
        return
    }
    // 再来解析token，解析失败则跳出
    token, claims, err := ParseToken(tokenString)
    if err != nil || !token.Valid {
        ctx.JSON(http.StatusUnauthorized, gin.H{"code": 401, "msg": "权限不足"})
        ctx.Abort()
        return
    }
    // 最后成功了
    ctx.JSON(http.StatusOK, gin.H{"code": 200, "id": claims.UserId, "msg": "认证通过"})
}
// ParseToken 解析token
func ParseToken(tokenString string) (*jwt.Token, *Claims, error) {
    Claims := &Claims{}
    token, err := jwt.ParseWithClaims(tokenString, Claims, func(token *jwt.Token) (i interface{}, err error) {
        return jwtkey, nil
    })
    return token, Claims, err
}