perf:减少PublishVideo中的数据库查询

backend/internal/middleware/jwt/jwt.go

@@ -124,3 +124,17 @@ func GetAccountID(c *gin.Context) (uint, error) {
 
 	return accountID, nil
 }
+
+func GetUsername(c *gin.Context) (string, error) {
+	val, exists := c.Get("username")
+	if !exists {
+		return "", errors.New("username not found")
+	}
+
+	username, ok := val.(string)
+	if !ok {
+		return "", errors.New("username has invalid type")
+	}
+
+	return username, nil
+}

backend/internal/video/video_handler.go

@@ -38,14 +38,14 @@ func (vh *VideoHandler) PublishVideo(c *gin.Context) {
 		c.JSON(400, gin.H{"error": err.Error()})
 		return
 	}
-	user, err := vh.accountService.FindByID(c.Request.Context(), authorId)
+	username, err := jwt.GetUsername(c)
 	if err != nil {
 		c.JSON(400, gin.H{"error": err.Error()})
 		return
 	}
 	video := &Video{
 		AuthorID:    authorId,
-		Username:    user.Username,
+		Username:    username,
 		Title:       req.Title,
 		Description: req.Description,
 		PlayURL:     req.PlayURL,