验证来自微信服务器的消息

type WeChatVerify struct {
	Signature string
	Timestamp string
	Nonce     string
	Echostr   string
}

func (p *WeChatVerify) Verify() bool {
	s := []string{token, p.Timestamp, p.Nonce}
	sort.Strings(s)
	str := strings.Join(s, "")
	hashs := sha1.New()
	hashs.Write([]byte(str))

	signature := hex.EncodeToString(hashs.Sum(nil))
	log.Infof("calc signature on local: %s", signature)
	if signature == p.Signature {
		return true
	} else {
		return false
	}
}

func wx(ctx *gin.Context) {
	log.Infof("get request : %s", ctx.Request.URL)
	verify := &WeChatVerify{
		Signature: ctx.Query("signature"),
		Timestamp: ctx.Query("timestamp"),
		Nonce:     ctx.Query("nonce"),
		Echostr:   ctx.Query("echostr"),
	}
	verifyBytes, _ := sonic.Marshal(verify)
	log.Infof("Get WeChatVerify from wechat server: %s", string(verifyBytes))

	if verify.Verify() {
		ctx.Writer.WriteString(verify.Echostr)
	} else {
		log.Error("WeChat Verify failed")
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "WeChat Verify failed"})
	}
}