fix: composesource object_size property should not call itself

minio/commonconfig.py

@@ -466,12 +466,12 @@ def build_headers(self, object_size: int, etag: str):
     @property
     def object_size(self) -> Optional[int]:
         """Get object size."""
-        if self.object_size is None:
+        if self._object_size is None:
             raise MinioException(
                 "build_headers() must be called prior to "
                 "this method invocation",
             )
-        return self.object_size
+        return self._object_size
 
     @property
     def headers(self) -> dict[str, str]:

tests/unit/composesource_test.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# MinIO Python Library for Amazon S3 Compatible Cloud Storage,
+# (C) 2015, 2016 MinIO, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from unittest import TestCase
+
+from minio.commonconfig import ComposeSource
+from minio.error import MinioException
+
+
+class ComposeSourceTest(TestCase):
+    def test_object_size(self):
+        source = ComposeSource(bucket_name="my-bucket",
+                               object_name="my-object")
+        with self.assertRaises(MinioException) as exc:
+            _ = source.object_size
+
+        msg = "build_headers() must be called prior to this method invocation"
+        self.assertEqual(msg, str(exc.exception))