Files
minio/cmd
Feng Ruohang b5409ca112 fix: report logical part sizes in GetObjectAttributes
GetObjectAttributes filled ObjectPart.Size from the on-disk part length
(cmd/object-handlers.go:715), so every compressed or encrypted multipart
object reported transformed sizes that do not sum to the logical
ObjectSize the same response returns from objInfo.GetActualSize().
Report each part's uploaded plaintext length instead: a compressed part
uses its recorded ActualSize, and a separately encrypted part derives the
plaintext length with sio.DecryptedSize, because ActualSize is the
ciphertext length for a replicated SSE-C part and zero for parts written
before actualSize existed.

Only parts of an encrypted multipart object are streams of their own. A
legacy encrypted object carries no multipart marker and is one continuous
stream that the erasure writer split into storage fragments, so those
fragments keep their stored size. Where a part is a stream, one whose
length cannot be a valid encrypted stream has no logical length, and the
request now fails with XMinioObjectTampered rather than reporting the
ciphertext length; DecryptObjectInfo does not catch that case, because
ObjectInfo.isMultipart gives up on the first bad part and only the object
total is then validated.

Tests: TestAPIGetObjectAttributesMultipartLogicalPartSize (plain,
compressed, SSE-C and compressed+SSE-C, consecutive and sparse part
numbers), TestAPIGetObjectAttributesCompressedEmptyTrailingPart,
TestAPIGetObjectAttributesEncryptedPartLengths, and a part-size assertion
added to TestAPISSECMultipartReplicationTrust. Compatibility: the XML
shape is unchanged and nothing is written to disk, only the value of the
existing Size element is corrected.

Fixes pgsty/silo#114

Signed-off-by: Feng Ruohang <rh@vonng.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L7qJqWwy8oFA6aCXWRzXQe
2026-09-05 16:17:39 +08:00
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