feat: add baidu obs storage (#9024)

api/extensions/storage/baidu_storage.py

@@ -0,0 +1,60 @@
+import base64
+import hashlib
+from collections.abc import Generator
+
+from baidubce.auth.bce_credentials import BceCredentials
+from baidubce.bce_client_configuration import BceClientConfiguration
+from baidubce.services.bos.bos_client import BosClient
+from flask import Flask
+
+from extensions.storage.base_storage import BaseStorage
+
+
+class BaiduStorage(BaseStorage):
+    """Implementation for baidu obs storage."""
+
+    def __init__(self, app: Flask):
+        super().__init__(app)
+        app_config = self.app.config
+        self.bucket_name = app_config.get("BAIDU_OBS_BUCKET_NAME")
+        client_config = BceClientConfiguration(
+            credentials=BceCredentials(
+                access_key_id=app_config.get("BAIDU_OBS_ACCESS_KEY"),
+                secret_access_key=app_config.get("BAIDU_OBS_SECRET_KEY"),
+            ),
+            endpoint=app_config.get("BAIDU_OBS_ENDPOINT"),
+        )
+
+        self.client = BosClient(config=client_config)
+
+    def save(self, filename, data):
+        md5 = hashlib.md5()
+        md5.update(data)
+        content_md5 = base64.standard_b64encode(md5.digest())
+        self.client.put_object(
+            bucket_name=self.bucket_name, key=filename, data=data, content_length=len(data), content_md5=content_md5
+        )
+
+    def load_once(self, filename: str) -> bytes:
+        response = self.client.get_object(bucket_name=self.bucket_name, key=filename)
+        return response.data.read()
+
+    def load_stream(self, filename: str) -> Generator:
+        def generate(filename: str = filename) -> Generator:
+            response = self.client.get_object(bucket_name=self.bucket_name, key=filename).data
+            while chunk := response.read(4096):
+                yield chunk
+
+        return generate()
+
+    def download(self, filename, target_filepath):
+        self.client.get_object_to_file(bucket_name=self.bucket_name, key=filename, file_name=target_filepath)
+
+    def exists(self, filename):
+        res = self.client.get_object_meta_data(bucket_name=self.bucket_name, key=filename)
+        if res is None:
+            return False
+        return True
+
+    def delete(self, filename):
+        self.client.delete_object(bucket_name=self.bucket_name, key=filename)