def s3_list_objects_v1(
    s3_obj, bucketname, prefix="", delimiter="", max_keys=1000, marker=""
):
    """
    Boto3 client based list object version1

    Args:
        s3_obj (obj): MCG or OBC object
        bucketname (str): Name of the bucket
        prefix (str): Limits the response to keys that begin with the specified prefix.
        delimiter (str): Character used to group keys.
        max_keys (int): Maximum number of keys returned in the response. Default 1,000 keys.
        marker (str): key to start with when listing objects in a bucket.

    Returns:
        dict : list object v1 response

    """
    return s3_obj.s3_client.list_objects(
        Bucket=bucketname,
        Prefix=prefix,
        Delimiter=delimiter,
        MaxKeys=max_keys,
        Marker=marker,
    )