Feat: generate thumbnails for image file

pkg/filesystem/validator.go

@@ -57,13 +57,18 @@ func (fs *FileSystem) ValidateExtension(ctx context.Context, fileName string) bo
 		return true
 	}
 
+	return IsInExtensionList(fs.User.Policy.OptionsSerialized.FileType, fileName)
+}
+
+// IsInExtensionList 返回文件的扩展名是否在给定的列表范围内
+func IsInExtensionList(extList []string, fileName string) bool {
 	ext := strings.ToLower(filepath.Ext(fileName))
 	// 无扩展名时
 	if len(ext) == 0 {
 		return false
 	}
 
-	if util.ContainsString(fs.User.Policy.OptionsSerialized.FileType, ext[1:]) {
+	if util.ContainsString(extList, ext[1:]) {
 		return true
 	}