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backend/app/downloaders/base.py

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+import enum
+
+from abc import ABC, abstractmethod
+from typing import Optional, Union
+
+from app.enmus.note_enums import DownloadQuality
+from app.models.notes_model import AudioDownloadResult
+from os import getenv
+QUALITY_MAP = {
+    "fast": "32",
+    "medium": "64",
+    "slow": "128"
+}
+
+
+class Downloader(ABC):
+    def __init__(self):
+        #TODO 需要修改为可配置
+        self.quality = QUALITY_MAP.get('fast')
+        self.cache_data=getenv('DATA_DIR')
+
+    @abstractmethod
+    def download(self, video_url: str, output_dir: str = None,
+                 quality: DownloadQuality = "fast", need_video: Optional[bool] = False) -> AudioDownloadResult:
+        '''
+
+        :param need_video:
+        :param video_url: 资源链接
+        :param output_dir: 输出路径 默认根目录data
+        :param quality: 音频质量 fast | medium | slow
+        :return:返回一个 AudioDownloadResult 类
+        '''
+        pass
+
+    @staticmethod
+    def download_video(self, video_url: str,
+                       output_dir: Union[str, None] = None) -> str:
+        pass