package wx

import (
	"context"
	"crypto/sha1"
	"fmt"
	"github.com/gogf/gf/v2/frame/g"
	"server/utility/wechat"
	"sort"
	"strings"

	"server/api/wx/v1"
)

func (c *ControllerV1) WeChatVertify(ctx context.Context, req *v1.WeChatVertifyReq) (res *v1.WeChatVertifyRes, err error) {

	// 1. 排序
	params := []string{wechat.GetWeChatClient().GetToken(), req.Timestamp, req.Nonce}
	sort.Strings(params)

	// 2. 拼接成字符串
	str := strings.Join(params, "")

	// 3. SHA1 加密
	h := sha1.New()
	h.Write([]byte(str))
	sha1Str := fmt.Sprintf("%x", h.Sum(nil))

	// 4. 比较签名
	if sha1Str != req.Signature {
		return nil, fmt.Errorf("签名错误")
	}
	g.RequestFromCtx(ctx).Response.Write(req.EchoStr)
	return nil, nil
}