Metadata values starting with space leading to signature mismatch on PUT

[sidharthrajaram]

When the following is done:

minio_client.fput_object(
    MY_BUCKET,
    f"some/path/file.ext",
    my_file_path,
    metadata={"SomeField": "     some value"}
)

Signature mismatch occurs:

minio.error.S3Error: S3 operation failed; code: SignatureDoesNotMatch, message: The request signature we calculated does not match the signature you provided. Check your key and signing method.

When I remove the spaces before some value, put object happens fine.

Looks like there is replacement/removal of spaces happening here:

minio-py/minio/signer.py

Line 77 in 57c5e37

_MULTI_SPACE_REGEX.sub(" ", value) for value in values

prior to signing which is leading to the signature mismatch.

[sidharthrajaram]

Tested same thing on Go SDK with no issue.