feat(tasks): add file janitor task for cleaning up unused files and schedule it

worker/internal/tasks/file.go

@@ -55,3 +55,63 @@ func RemoveFile(ctx context.Context, task *asynq.Task) error {
 	}
 	return nil
 }
+
+func FileJanitor(_ context.Context, _ *asynq.Task) error {
+	uploadPath, err := u.GetUploadDirPath()
+	if err != nil {
+		return err
+	}
+
+	entries, err := os.ReadDir(uploadPath)
+	if err != nil {
+		return err
+	}
+
+	allFileInfo, err := models.GetRedisFileInfoAll()
+	if err != nil {
+		return err
+	}
+
+	// Case 1: 本地有但 fileInfoMap 無 → 直接刪除
+	for _, entry := range entries {
+		name := entry.Name()
+		fileId := strings.TrimSuffix(name, "_tmp")
+		if _, exists := allFileInfo[fileId]; !exists {
+			if err := os.RemoveAll(filepath.Join(uploadPath, name)); err != nil {
+				return err
+			}
+		}
+	}
+
+	// Case 2 & 3: 遍歷 fileInfoMap
+	now := time.Now().Unix()
+	for fileId, rawInfo := range allFileInfo {
+		var info models.RedisFileInfo
+		if err := json.Unmarshal([]byte(rawInfo), &info); err != nil {
+			continue
+		}
+
+		// Case 2: init 狀態且已過期
+		if info.FileType == models.FileTypeInit && info.CreatedAt+info.Expire < now {
+			if err := pkgservices.SetFileRemoveTask(fileId, 0); err != nil {
+				return err
+			}
+			continue
+		}
+
+		// Case 3: 已完成上傳但無 share 關係
+		if info.FileType == models.FileTypeUpload {
+			shareIDs, err := models.GetRedisFileShareRelational(fileId)
+			if err != nil {
+				return err
+			}
+			if len(shareIDs) == 0 {
+				if err := pkgservices.SetFileRemoveTask(fileId, 0); err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	return nil
+}

worker/main.go

@@ -46,10 +46,20 @@ func main() {
 	mux.HandleFunc("share:remove", tasks.RemoveShare)
 	mux.HandleFunc("share:notify", tasks.ShareNotify)
 	mux.HandleFunc("file:remove", tasks.RemoveFile)
+	mux.HandleFunc("file:janitor", tasks.FileJanitor)
 	mux.HandleFunc("image:compress", tasks.CompressImage)
 	mux.HandleFunc("image:convert", tasks.ConvertImage)
 	mux.HandleFunc("text:translate", tasks.TranslateText)
 
+	scheduler := asynq.NewScheduler(utils.RedisURI2AsynqOpt(utils.GetEnv("redis.url")), nil)
+	if _, err := scheduler.Register("0 3 * * *", asynq.NewTask("file:janitor", nil)); err != nil {
+		log.Fatalf("could not register scheduler: %v", err)
+	}
+	if err := scheduler.Start(); err != nil {
+		log.Fatalf("could not start scheduler: %v", err)
+	}
+	defer scheduler.Shutdown()
+
 	if err := srv.Run(mux); err != nil {
 		log.Fatalf("could not run server: %v", err)
 	}