实现文件下载功能，添加下载文件方法和相关的文件信息获取逻辑。更新主驱动类以支持文件下载，并在工具类中实现文件下载的进度条显示。

_main.py

@@ -1,4 +1,5 @@
 import re
+import os
 from typing import Dict, List, Optional, Any
 
 from _api import API
@@ -30,6 +31,7 @@ class Driver:
         dir: str = '/',
         page: int = 1,
         limit: int = 100,
+        return_parentFileId: bool = False,
     ):
         """获取目录下的文件列表"""
         logger.info(f"Calling list_dir(dir={dir}, page={page}, limit={limit})")
@@ -43,7 +45,10 @@ class Driver:
                 logger.debug(f"Updated parentFileId: {parentFileId}")
                 files = await self._list_dir_fetch_or_cache(parentFileId=parentFileId, page=page, limit=limit)
         logger.info(f"Returning file list for dir={dir}")
-        return files['data']['fileList']
+        if return_parentFileId:
+            return files['data']['fileList'], parentFileId
+        else:
+            return files['data']['fileList']
     
     async def _list_dir_fetch_or_cache(
         self,
@@ -121,6 +126,48 @@ class Driver:
         logger.debug(f"Directory {filename} not found in fileList.")
         return False
 
+    async def fetch_file(self, parentFileId: int, filename: str, lastFileId: Optional[int] = None, page: int = 1) -> Dict[str, Any]:
+        """获取文件信息"""
+        logger.info(f"Calling fetch_file(parentFileID={parentFileId}, filename={filename})")
+        files = self.utils.get_cached_files(parentFileId=parentFileId, page=page)
+        if not files:
+            files = await self.api.list_files_v2(parentFileId=parentFileId, limit=100, lastFileId=lastFileId)
+            self.utils.cache_files(files=files, parentFileId=parentFileId, page=page)
+        for f in files['data']['fileList']:
+            if f['type'] == 0 and f['filename'] == filename:    
+                logger.debug(f"Found file {filename} in fileList.")
+                return f
+        if lastFileId != -1: # 文件名不在文件列表中，但有lastFileId，继续搜索
+            logger.debug(f"Fetching more files for parentFileId={parentFileId} with lastFileId={lastFileId}")
+            await self.fetch_file(parentFileId=parentFileId, filename=filename, lastFileId=lastFileId, page=page+1)   
+        logger.error(f"Error: {filename} not found in {files['data']['fileList']}")
+        return {}
+    
+    async def download_file(
+        self,
+        file_path: str,
+        save_path: str,
+        progress_bar: bool = True,
+    ):
+        """下载文件"""
+        logger.info(f"Calling download_file(file_path={file_path}, save_path={save_path})")
+        dirname = os.path.dirname(file_path)
+        _, parentFileId = await self.list_dir(dir=dirname, return_parentFileId=True)
+        file = await self.fetch_file(parentFileId=parentFileId, filename=os.path.basename(file_path))
+        if file:
+            logger.debug(f"Downloading file {file_path} to {save_path}")
+            downlod_info = await self.api.download_file(fileId=file['fileId'])
+            if downlod_info.get('code') == 0:
+                logger.debug(f"Downloading file {file_path} to {save_path} started.")
+                self.utils.download_file(url=downlod_info['data']['downloadUrl'], file_path=save_path, progress_bar=progress_bar)
+            else:
+                logger.error(f"Error: {downlod_info.get('message')}")
+        else:
+            logger.error(f"Error: {file_path} not found.")
+        return downlod_info
+        
+
+
 @async_to_sync
 async def main() -> None:
     from privacy import client_id, client_secret
@@ -129,9 +176,8 @@ async def main() -> None:
     logger.info("Starting main()")
     driver = Driver(client_id=client_id, client_secret=client_secret)
     start_time = time.time()
-    dirs = await driver.list_dir(dir='/nas/Documents')
-    utils.print_file_list(dirs)
-    print(utils.computing_time(start_time))
+    dirs = await driver.list_dir(dir='/')
+    
 
     
 if __name__ == '__main__':