Description of problem:
complete-multipart-upload is not returning ChecksumType in the response along with checksum.
this doc says ChecksumType will also be returned in complete-multipart-upload response
https://docs.aws.amazon.com/cli/latest/reference/s3api/complete-multipart-upload.html

but get-object-attributes returns ChecksumType also as expected.


log snippet:

multipart upload for obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi
executing cmd: /usr/local/bin/aws s3api create-multipart-upload --bucket bkt1 --key obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi --endpoint-url http://10.0.65.187:80 --checksum-algorithm sha1
cmd excuted
{
    "ChecksumAlgorithm": "SHA1",
    "Bucket": "bkt1",
    "Key": "obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi",
    "UploadId": "2~1o6JU2JKkM08u50n8CJ0cpou5R5XFel"
}

executing cmd: /usr/local/bin/aws s3api upload-part --bucket bkt1 --key obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi --endpoint-url http://10.0.65.187:80 --part-number 1 --upload-id 2~1o6JU2JKkM08u50n8CJ0cpou5R5XFel --body obj10MB.parts/aa --checksum-algorithm sha1
cmd excuted
{
    "ETag": "\"5f363e0e58a95f06cbe9bbc662c5dfb6\"",
    "ChecksumSHA1": "LpXXWCxTWD+or7VOD+eiWXySy7o="
}

executing cmd: /usr/local/bin/aws s3api upload-part --bucket bkt1 --key obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi --endpoint-url http://10.0.65.187:80 --part-number 2 --upload-id 2~1o6JU2JKkM08u50n8CJ0cpou5R5XFel --body obj10MB.parts/ab --checksum-algorithm sha1
cmd excuted
{
    "ETag": "\"443b86c26729f5f24407c7236957d653\"",
    "ChecksumSHA1": "muoQKAGJRnSzaacZnt59tAAJp1E="
}

executing cmd: /usr/local/bin/aws s3api complete-multipart-upload --bucket bkt1 --key obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi --endpoint-url http://10.0.65.187:80 --upload-id 2~1o6JU2JKkM08u50n8CJ0cpou5R5XFel --multipart-upload file://parts.json
cmd excuted
{
    "Location": "http://10.0.65.187/bkt1/obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi",
    "Bucket": "bkt1",
    "Key": "obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi",
    "ETag": "\"bf4ac386d613c42233666c89a2571b61-2\"",
    "ChecksumSHA1": "QA/1P9V02ipPHOPyWBbPMkvziFg=-2"
}

executing cmd: /usr/local/bin/aws --endpoint-url http://10.0.65.187:80 s3api get-object-attributes --bucket bkt1 --key obj2_awsv2_default_checksum_verify_checksum_type_sha1_multi --object-attributes checksum etag ObjectParts ObjectSize StorageClass
cmd excuted
{
    "LastModified": "2025-03-27T11:45:15+00:00",
    "ETag": "bf4ac386d613c42233666c89a2571b61-2",
    "Checksum": {
        "ChecksumSHA1": "QA/1P9V02ipPHOPyWBbPMkvziFg=-2",
        "ChecksumType": "COMPOSITE"
    },
    "ObjectParts": {
        "TotalPartsCount": 2,
        "IsTruncated": false,
        "Parts": [
            {
                "PartNumber": 1,
                "Size": 5242880,
                "ChecksumSHA1": "LpXXWCxTWD+or7VOD+eiWXySy7o="
            },
            {
                "PartNumber": 2,
                "Size": 4757120,
                "ChecksumSHA1": "muoQKAGJRnSzaacZnt59tAAJp1E="
            }
        ]
    },
    "StorageClass": "STANDARD",
    "ObjectSize": 10000000
}



Version-Release number of selected component (if applicable):
ceph version 19.2.0-122.el9cp

How reproducible:
always

Steps to Reproduce:
1.create multipart upload with any checksum algorithm in the request
2.upload parts
3.complete-multipart-upload is not returning ChecksumType in the request along with checksum value. but the get-object-attributes of the object returns both checksum and ChecksumType

Actual results:
complete-multipart-upload is not returning ChecksumType in the response along with checksum.

Expected results:
expected complete-multipart-upload returns ChecksumType also in the response along with checksum value.

Additional info:
logs: https://docs.google.com/document/d/1v__zZu6UhFdoEeABpEYf5cA46wLQOWh0ImKvEIXtZUA/edit?usp=sharing