feat: add callback

backend/app/http/pays.go

@@ -0,0 +1,50 @@
+package http
+
+import (
+	"fmt"
+	"net/http"
+
+	"quyun/providers/wepay"
+
+	"github.com/go-pay/gopay"
+	"github.com/go-pay/gopay/wechat/v3"
+	"github.com/go-pay/util/js"
+	"github.com/gofiber/fiber/v3"
+)
+
+type pays struct {
+	wepay *wepay.Client
+}
+
+// Callback
+// @Router			/pay/callback [get]
+func (ctl *pays) Callback(ctx fiber.Ctx) error {
+	body := ctx.Body()
+	si := &wechat.SignInfo{
+		HeaderTimestamp: ctx.Get(wechat.HeaderTimestamp),
+		HeaderNonce:     ctx.Get(wechat.HeaderNonce),
+		HeaderSignature: ctx.Get(wechat.HeaderSignature),
+		HeaderSerial:    ctx.Get(wechat.HeaderSerial),
+		SignBody:        string(body),
+	}
+	notifyReq := &wechat.V3NotifyReq{SignInfo: si}
+	if err := js.UnmarshalBytes(body, notifyReq); err != nil {
+		return ctx.Status(http.StatusBadRequest).JSON(fiber.Map{"error": fmt.Sprintf("json unmarshal error:%v", err)})
+	}
+
+	// 获取微信平台证书
+	certMap := ctl.wepay.WxPublicKeyMap()
+
+	// 验证异步通知的签名
+	err := notifyReq.VerifySignByPKMap(certMap)
+	if err != nil {
+		return ctx.Status(http.StatusBadRequest).JSON(fiber.Map{"error": "Invalid signature"})
+	}
+
+	// TODO: add process order job
+
+	return ctx.Status(http.StatusOK).JSON(&wechat.V3NotifyRsp{
+		Code:    gopay.SUCCESS,
+		Message: "成功",
+	})
+}