Handle null case when encoding / decoding sha1 in BaseFileVersion

b2sdk/_internal/file_version.py

@@ -95,13 +95,19 @@ def __init__(
             self.mod_time_millis = self.upload_timestamp
 
     @classmethod
-    def _decode_content_sha1(cls, content_sha1):
+    def _decode_content_sha1(cls, content_sha1: str | None) -> tuple[str | None, bool]:
+        if content_sha1 is None:
+            return None, True
         if content_sha1.startswith(UNVERIFIED_CHECKSUM_PREFIX):
             return content_sha1[len(UNVERIFIED_CHECKSUM_PREFIX) :], False
         return content_sha1, True
 
     @classmethod
-    def _encode_content_sha1(cls, content_sha1, content_sha1_verified):
+    def _encode_content_sha1(
+        cls, content_sha1: str | None, content_sha1_verified: bool
+    ) -> str | None:
+        if content_sha1 is None:
+            return None
         if not content_sha1_verified:
             return f'{UNVERIFIED_CHECKSUM_PREFIX}{content_sha1}'
         return content_sha1

changelog.d/553.fixed.md

@@ -0,0 +1 @@
+Handle null case when encoding / decoding `content_sha1` in BaseFileVersion.

test/unit/file_version/test_file_version.py

@@ -117,6 +117,14 @@ def test_clone_file_version_and_download_version(self):
         assert isinstance(cloned, DownloadVersion)
         assert cloned.as_dict() == {**download_version.as_dict(), 'legalHold': LegalHold.OFF.value}
 
+    def test_clone_file_version_with_unknown_sha1(self):
+        cloned = self.file_version._clone(content_sha1=None)
+
+        assert isinstance(cloned, VFileVersion)
+        assert cloned.content_sha1 is None
+        assert cloned.content_sha1_verified is True
+        assert 'contentSha1' not in cloned.as_dict()
+
     def test_update_legal_hold(self):
         new_file_version = self.file_version.update_legal_hold(LegalHold.ON)
         assert isinstance(new_file_version, VFileVersion)