fix SnowballObject typing (#1449)

Signed-off-by: Bala.FA <bala@minio.io>

Author: balamurugana

minio/api.py

@@ -34,7 +34,7 @@
 from datetime import datetime, timedelta
 from io import BytesIO
 from random import random
-from typing import IO, BinaryIO, Iterator, TextIO, Tuple, Union, cast
+from typing import BinaryIO, Iterator, TextIO, Tuple, Union, cast
 from urllib.parse import urlunsplit
 from xml.etree import ElementTree as ET
 
@@ -3020,7 +3020,7 @@ def upload_snowball_objects(
                     info.mtime = int(
                         time.to_float(obj.mod_time or time.utcnow()),
                     )
-                    tar.addfile(info, cast(Union[IO[bytes], None], obj.data))
+                    tar.addfile(info, obj.data)
 
         if not name:
             length = cast(BytesIO, fileobj).tell()

minio/commonconfig.py

@@ -21,7 +21,7 @@
 
 from abc import ABCMeta
 from datetime import datetime
-from typing import Type, TypeVar, cast
+from typing import IO, Type, TypeVar, cast
 from xml.etree import ElementTree as ET
 
 from .error import MinioException
@@ -533,7 +533,7 @@ def __init__(
             self,
             object_name: str,
             filename: str | None = None,
-            data: bytes | None = None,
+            data: IO[bytes] | None = None,
             length: int | None = None,
             mod_time: datetime | None = None,
     ):
@@ -544,6 +544,8 @@ def __init__(
             self._length = length
         else:
             raise ValueError("only one of filename or data must be provided")
+        if data is not None and length is None:
+            raise ValueError("length must be provided for data")
         if mod_time is not None and not isinstance(mod_time, datetime):
             raise ValueError("mod_time must be datetime type")
         self._mod_time = mod_time
@@ -559,7 +561,7 @@ def filename(self) -> str | None:
         return self._filename
 
     @property
-    def data(self) -> bytes | None:
+    def data(self) -> IO[bytes] | None:
         """Get data."""
         return self._data