diff --git a/internal/base/middleware/avatar.go b/internal/base/middleware/avatar.go
index d38e76c9..82e6ceab 100644
--- a/internal/base/middleware/avatar.go
+++ b/internal/base/middleware/avatar.go
@@ -17,12 +17,12 @@ import (
 
 type AvatarMiddleware struct {
 	serviceConfig   *service_config.ServiceConfig
-	uploaderService *uploader.UploaderService
+	uploaderService uploader.UploaderService
 }
 
 // NewAvatarMiddleware new auth user middleware
 func NewAvatarMiddleware(serviceConfig *service_config.ServiceConfig,
-	uploaderService *uploader.UploaderService,
+	uploaderService uploader.UploaderService,
 ) *AvatarMiddleware {
 	return &AvatarMiddleware{
 		serviceConfig:   serviceConfig,
diff --git a/internal/controller/upload_controller.go b/internal/controller/upload_controller.go
index 9429eba5..3154cc85 100644
--- a/internal/controller/upload_controller.go
+++ b/internal/controller/upload_controller.go
@@ -21,11 +21,11 @@ const (
 
 // UploadController upload controller
 type UploadController struct {
-	uploaderService *uploader.UploaderService
+	uploaderService uploader.UploaderService
 }
 
 // NewUploadController new controller
-func NewUploadController(uploaderService *uploader.UploaderService) *UploadController {
+func NewUploadController(uploaderService uploader.UploaderService) *UploadController {
 	return &UploadController{
 		uploaderService: uploaderService,
 	}
diff --git a/internal/controller/user_controller.go b/internal/controller/user_controller.go
index 88e57ca3..51fbc4ea 100644
--- a/internal/controller/user_controller.go
+++ b/internal/controller/user_controller.go
@@ -24,7 +24,7 @@ type UserController struct {
 	userService           *service.UserService
 	authService           *auth.AuthService
 	actionService         *action.CaptchaService
-	uploaderService       *uploader.UploaderService
+	uploaderService       uploader.UploaderService
 	emailService          *export.EmailService
 	siteInfoCommonService *siteinfo_common.SiteInfoCommonService
 }
@@ -35,7 +35,7 @@ func NewUserController(
 	userService *service.UserService,
 	actionService *action.CaptchaService,
 	emailService *export.EmailService,
-	uploaderService *uploader.UploaderService,
+	uploaderService uploader.UploaderService,
 	siteInfoCommonService *siteinfo_common.SiteInfoCommonService,
 ) *UserController {
 	return &UserController{
diff --git a/internal/service/uploader/upload.go b/internal/service/uploader/upload.go
index 3de12ff2..3b978521 100644
--- a/internal/service/uploader/upload.go
+++ b/internal/service/uploader/upload.go
@@ -51,29 +51,36 @@ var (
 	}
 )
 
-// UploaderService user service
-type UploaderService struct {
+type UploaderService interface {
+	UploadAvatarFile(ctx *gin.Context) (url string, err error)
+	AvatarThumbFile(ctx *gin.Context, uploadPath, fileName string, size int) (avatarFile []byte, err error)
+	UploadPostFile(ctx *gin.Context) (url string, err error)
+	UploadBrandingFile(ctx *gin.Context) (url string, err error)
+}
+
+// uploaderService uploader service
+type uploaderService struct {
 	serviceConfig   *service_config.ServiceConfig
 	siteInfoService *siteinfo_common.SiteInfoCommonService
 }
 
 // NewUploaderService new upload service
 func NewUploaderService(serviceConfig *service_config.ServiceConfig,
-	siteInfoService *siteinfo_common.SiteInfoCommonService) *UploaderService {
+	siteInfoService *siteinfo_common.SiteInfoCommonService) UploaderService {
 	for _, subPath := range subPathList {
 		err := dir.CreateDirIfNotExist(filepath.Join(serviceConfig.UploadPath, subPath))
 		if err != nil {
 			panic(err)
 		}
 	}
-	return &UploaderService{
+	return &uploaderService{
 		serviceConfig:   serviceConfig,
 		siteInfoService: siteInfoService,
 	}
 }
 
 // UploadAvatarFile upload avatar file
-func (us *UploaderService) UploadAvatarFile(ctx *gin.Context) (url string, err error) {
+func (us *uploaderService) UploadAvatarFile(ctx *gin.Context) (url string, err error) {
 	url, err = us.tryToUploadByPlugin(ctx, plugin.UserAvatar)
 	if err != nil {
 		return "", err
@@ -98,7 +105,7 @@ func (us *UploaderService) UploadAvatarFile(ctx *gin.Context) (url string, err e
 	return us.uploadFile(ctx, file, avatarFilePath)
 }
 
-func (us *UploaderService) AvatarThumbFile(ctx *gin.Context, uploadPath, fileName string, size int) (
+func (us *uploaderService) AvatarThumbFile(ctx *gin.Context, uploadPath, fileName string, size int) (
 	avatarfile []byte, err error) {
 	if size > 1024 {
 		size = 1024
@@ -151,7 +158,7 @@ func (us *UploaderService) AvatarThumbFile(ctx *gin.Context, uploadPath, fileNam
 	return buf.Bytes(), nil
 }
 
-func (us *UploaderService) UploadPostFile(ctx *gin.Context) (
+func (us *uploaderService) UploadPostFile(ctx *gin.Context) (
 	url string, err error) {
 	url, err = us.tryToUploadByPlugin(ctx, plugin.UserAvatar)
 	if err != nil {
@@ -177,7 +184,7 @@ func (us *UploaderService) UploadPostFile(ctx *gin.Context) (
 	return us.uploadFile(ctx, file, avatarFilePath)
 }
 
-func (us *UploaderService) UploadBrandingFile(ctx *gin.Context) (
+func (us *uploaderService) UploadBrandingFile(ctx *gin.Context) (
 	url string, err error) {
 	url, err = us.tryToUploadByPlugin(ctx, plugin.UserAvatar)
 	if err != nil {
@@ -204,7 +211,7 @@ func (us *UploaderService) UploadBrandingFile(ctx *gin.Context) (
 	return us.uploadFile(ctx, file, avatarFilePath)
 }
 
-func (us *UploaderService) uploadFile(ctx *gin.Context, file *multipart.FileHeader, fileSubPath string) (
+func (us *uploaderService) uploadFile(ctx *gin.Context, file *multipart.FileHeader, fileSubPath string) (
 	url string, err error) {
 	siteGeneral, err := us.siteInfoService.GetSiteGeneral(ctx)
 	if err != nil {
@@ -230,7 +237,7 @@ func (us *UploaderService) uploadFile(ctx *gin.Context, file *multipart.FileHead
 	return url, nil
 }
 
-func (us *UploaderService) tryToUploadByPlugin(ctx *gin.Context, source plugin.UploadSource) (
+func (us *uploaderService) tryToUploadByPlugin(ctx *gin.Context, source plugin.UploadSource) (
 	url string, err error) {
 	_ = plugin.CallStorage(func(fn plugin.Storage) error {
 		resp := fn.UploadFile(ctx, source)