package middleware

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"icloudapp.cn/tools/entity"
	"icloudapp.cn/tools/service"
	"net/http"
	"strings"
)

// 基于JWT认证的中间件   验证token的中间件
func JWTAuthMiddleware() func(c *gin.Context) {
	return func(ctx *gin.Context) {
		//携带Token有三种方式
		//1.放在请求头
		//2.放在请求体
		//3.放在URI
		//这里实现的方法是Token放在header的Authorization，并使用Bearer开头
		authHeader := ctx.Request.Header.Get("Authorization") //获取请求中头部的token
		cookie, _ := ctx.Cookie("poster_sid")
		if authHeader == "" && cookie != "" {
			authHeader = "Bearer " + cookie
		}
		if authHeader == "" {
			ctx.JSON(http.StatusOK, gin.H{
				"code": entity.CodeAuthIsNull,
				"msg":  entity.CodeAuthIsNull.Msg(),
			})
			ctx.Abort() //授权失败，调用Abort以确保没有调用此请求的其余处理程序
			return
		}

		parts := strings.SplitN(authHeader, " ", 2)
		if !(len(parts) == 2 && parts[0] == "Bearer") {
			ctx.JSON(http.StatusOK, gin.H{
				"code": entity.CodeInvalidToken,
				"msg":  entity.CodeInvalidToken.Msg(),
			})
			ctx.Abort()
			return
		}

		posterClaim, err := service.ParseJWTToken(parts[1])
		if err != nil {
			ctx.JSON(http.StatusOK, gin.H{
				"code": entity.CodeTokenExpired,
				"msg":  entity.CodeTokenExpired.Msg(),
			})
			ctx.Abort()
			return
		}
		//token 和 redis 中保存的不匹配，也验证失败
		token := service.GetJWTTokenFromRedis(posterClaim.Uid)
		if token == "" || token != parts[1] {
			ctx.JSON(http.StatusOK, gin.H{
				"code": entity.CodeAuthFail,
				"msg":  entity.CodeAuthFail.Msg(),
			})
			ctx.Abort()
			return
		}

		//将当前请求的username信息保存到请求的上下文c
		ctx.Set("jwt_uid", posterClaim.Uid)
		ctx.Set("jwt_username", posterClaim.Username)
		//设置Request参数
		ctx.AddParam("jwt_uid", fmt.Sprint(posterClaim.Uid))
		ctx.AddParam("jwt_username", posterClaim.Username)
		ctx.Next()
	}
}