Amazon.S3.Util.AmazonS3Util.SetupForObjectModification C# (CSharp) Method

        static void SetupForObjectModification(IAmazonS3 s3Client, string bucketName, string key, string version, 
            out CopyObjectRequest copyRequest, out PutACLRequest putACLRequest)
        {
            // Get the existing ACL of the object
            GetACLRequest getACLRequest = new GetACLRequest();
            getACLRequest.BucketName = bucketName;
            getACLRequest.Key = key;
            if (version != null)
                getACLRequest.VersionId = version;
            GetACLResponse getACLResponse = s3Client.GetACL(getACLRequest);


            // Set the object's original ACL back onto it because a COPY
            // operation resets the ACL on the destination object.
            putACLRequest = new PutACLRequest();
            putACLRequest.BucketName = bucketName;
            putACLRequest.Key = key;
            putACLRequest.AccessControlList = getACLResponse.AccessControlList;


            ListObjectsResponse listObjectResponse = s3Client.ListObjects(new ListObjectsRequest
            {
                BucketName = bucketName,
                Prefix = key,
                MaxKeys = 1
            });

            if (listObjectResponse.S3Objects.Count != 1)
            {
                throw new InvalidOperationException("No object exists with this bucket name and key.");
            }

            GetObjectMetadataRequest getMetaRequest = new GetObjectMetadataRequest()
            {
                BucketName = bucketName,
                Key = key
            };
            GetObjectMetadataResponse getMetaResponse = s3Client.GetObjectMetadata(getMetaRequest);

            // Set the storage class on the object
            copyRequest = new CopyObjectRequest();
            copyRequest.SourceBucket = copyRequest.DestinationBucket = bucketName;
            copyRequest.SourceKey = copyRequest.DestinationKey = key;
            copyRequest.StorageClass = listObjectResponse.S3Objects[0].StorageClass == "STANDARD" ? S3StorageClass.Standard : S3StorageClass.ReducedRedundancy;
            if (version != null)
                copyRequest.SourceVersionId = version;

            copyRequest.WebsiteRedirectLocation = getMetaResponse.WebsiteRedirectLocation;
            copyRequest.ServerSideEncryptionMethod = getMetaResponse.ServerSideEncryptionMethod;
        }