feat: support balance pay

backend/app/http/posts.go

@@ -5,12 +5,14 @@ import (
 	"strconv"
 	"time"
 
+	"quyun/app/jobs"
 	"quyun/app/models"
 	"quyun/app/requests"
 	"quyun/database/conds"
 	"quyun/database/fields"
 	"quyun/database/schemas/public/model"
 	"quyun/providers/ali"
+	"quyun/providers/job"
 	"quyun/providers/wepay"
 
 	"github.com/go-pay/gopay/wechat/v3"
@@ -28,6 +30,7 @@ type ListQuery struct {
 type posts struct {
 	wepay *wepay.Client
 	oss   *ali.OSSClient
+	job   *job.Job
 }
 
 // List posts
@@ -276,6 +279,22 @@ func (ctl *posts) Buy(ctx fiber.Ctx, id int64, user *model.Users) (*wechat.JSAPI
 	}
 
 	payPrice := post.Price * int64(post.Discount) / 100
+	if user.Balance >= payPrice {
+		err = models.Users.SetBalance(ctx.Context(), user.ID, user.Balance-payPrice)
+		if err != nil {
+			return nil, errors.Wrap(err, "余额支付失败")
+		}
+
+		if err := ctl.job.Add(&jobs.BalancePayNotify{OrderNo: order.OrderNo}); err != nil {
+			log.Errorf("add job error:%v", err)
+			return nil, errors.Wrap(err, "Failed to add job")
+		}
+
+		return &wechat.JSAPIPayParams{
+			AppId: "balance",
+		}, nil
+	}
+
 	prePayResp, err := ctl.wepay.V3TransactionJsapi(ctx.Context(), func(bm *wepay.BodyMap) {
 		bm.
 			Expire(30 * time.Minute).