add download message image

app/utils.py

@@ -31,9 +31,7 @@ def get_message_resource(client, message_id, file_key, file_type, save_dir):
 
     # 处理业务结果
 
-    # 处理业务结果
-
-    file_path = os.path.join(save_dir, file_key)
+    file_path = os.path.join(save_dir, file_key + ".png")
     with open(file_path, "wb") as f:
         f.write(response.file.read())