User supplied flexible checksums not respected

[aajtodd]

Describe the bug

When a user supplies both checksum_algorithm and a pre-calculated checksum the SDK will go ahead and calculate one anyway and overwrite the user supplied one.

s3.put_object()
    .bucket(bucket_name)
    .key(key_name)
    .checksum_algorithm(aws_sdk_s3::types::ChecksumAlgorithm::Sha256)
    .checksum_sha256("bad-sha")
    .body(body)
    .send()
    .await?;

Expected Behavior

The SDK should detect this and use the user supplied value and do nothing. This is the behavior described in the SEP.

Current Behavior

The user supplied checksum is serialized to a header and then is later overwritten with the value it calculates.

Reproduction Steps

See bug description. Sending a bad value for the checksum should fail but it doesn't because we overwrite it.

Possible Solution

No response

Additional Information/Context

No response

Version

aws-sdk-s3 = "1.21.0"

Environment details (OS name and version, etc.)

macOS 14.4

Logs

No response

[CNorskov]

Same problem here (with a working solution):
#1103 (comment)

In short:
A workaround is not specifying the algorithm. So a working code would be:

s3.put_object()
    .bucket(bucket_name)
    .key(key_name)
    .checksum_sha256("bad-sha")
    .body(body)
    .send()
    .await?;

[aajtodd]

closing as duplicate of #1103

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