feat(source link): record downloads for redirected source link

middleware/file.go

@@ -23,6 +23,7 @@ func ValidateSourceLink() gin.HandlerFunc {
 			return
 		}
 
+		sourceLink.Downloaded()
 		c.Set("source_link", sourceLink)
 		c.Next()
 	}

models/source_link.go

@@ -39,3 +39,9 @@ func GetSourceLinkByID(id interface{}) (*SourceLink, error) {
 
 	return link, result.Error
 }
+
+// Viewed 增加访问次数
+func (s *SourceLink) Downloaded() {
+	s.Downloads++
+	DB.Model(s).UpdateColumn("downloads", gorm.Expr("downloads + ?", 1))
+}