import org.eclipse.aether.internal.impl.checksum.DefaultChecksumAlgorithmFactorySelector;
import org.eclipse.aether.internal.impl.checksum.Md5ChecksumAlgorithmFactory;
import org.eclipse.aether.internal.impl.checksum.Sha1ChecksumAlgorithmFactory;
import org.eclipse.aether.internal.impl.checksum.Sha256ChecksumAlgorithmFactory;
import org.eclipse.aether.internal.impl.checksum.Sha512ChecksumAlgorithmFactory;

	MinIOServerStatus = "x-minio-server-status"

	// Content Checksums
	AmzChecksumAlgo   = "x-amz-checksum-algorithm"
	AmzChecksumCRC32  = "x-amz-checksum-crc32"
	AmzChecksumCRC32C = "x-amz-checksum-crc32c"
	AmzChecksumSHA1   = "x-amz-checksum-sha1"
	AmzChecksumSHA256 = "x-amz-checksum-sha256"
	AmzChecksumMode   = "x-amz-checksum-mode"

	// Delete special flag to force delete a bucket or a prefix

  }

  private static void assertChecksum(ImmutableSupplier<Checksum> supplier, String input) {
    byte[] bytes = HashTestUtils.ascii(input);

    Checksum checksum = supplier.get();
    checksum.update(bytes, 0, bytes.length);
    long value = checksum.getValue();

    String toString = "name";
    HashFunction func = new ChecksumHashFunction(supplier, 32, toString);

	r.md5.Write(p[:n])

	if err == io.EOF && len(r.checksum) != 0 {
		if etag := r.ETag(); !Equal(etag, r.checksum) {
			return n, VerifyError{
				Expected: r.checksum,
				Computed: etag,
			}
		}
	}
	return n, err
}

// ETag returns the ETag of all the content read
// so far. Reading more content changes the MD5
// checksum. Therefore, calling ETag multiple
// times may return different results.

	if err != nil {
		return levent.Event{}, err
	}

	ckSum := sha256.Sum256([]byte(cred.AccessKey + u.RawQuery))

	eventData := levent.Event{
		GetObjectContext: &levent.GetObjectContext{
			InputS3URL:  u.String(),
			OutputRoute: shortuuid.New(),
			OutputToken: hex.EncodeToString(ckSum[:]),
		},
		UserRequest: levent.UserRequest{
			URL:     r.URL.String(),
			Headers: r.Header.Clone(),

            log.trace(
                String.format(
                    "Checksum data %s type %d signature %s",
                    Hexdump.toHexString(checksumData),
                    this.serverSignature.getType(),
                    Hexdump.toHexString(this.serverSignature.getChecksum())));
        }

        byte checksum[] = PacMac.calculateMac(this.serverSignature.getType(), keys, checksumData);

        wagon.clearExpectedContent();
        wagon.addExpectedContent("path", "lower-case-checksum");
        wagon.addExpectedContent("path.sha1", "2a25dc564a3b34f68237fc849066cbc7bb7a36a1");
        wagonManager.getArtifact(artifact, repo, null, false);

        wagon.clearExpectedContent();
        wagon.addExpectedContent("path", "upper-case-checksum");
        wagon.addExpectedContent("path.sha1", "B7BB97D7D0B9244398D9B47296907F73313663E6");

		VersionPurgeStatus:         ri.VersionPurgeStatus,
		VersionPurgeStatusInternal: ri.VersionPurgeStatusInternal,
		DeleteMarker:               true,
		UserDefined:                map[string]string{},
		Checksum:                   ri.Checksum,
	}
}

// ReplicateObjectInfo represents object info to be replicated
type ReplicateObjectInfo struct {
	Name                       string
	Bucket                     string

	NEndpoints int
	CmdLines   []string
	MinioEnv   map[string]string
	Checksum   string
}

// Diff - returns error on first difference found in two configs.
func (s1 *ServerSystemConfig) Diff(s2 *ServerSystemConfig) error {
	if s1.Checksum != s2.Checksum {
		return fmt.Errorf("Expected MinIO binary checksum: %s, seen: %s", s1.Checksum, s2.Checksum)
	}

	ns1 := s1.NEndpoints
	ns2 := s2.NEndpoints
	if ns1 != ns2 {

	return fmt.Sprintf("Size mismatch: got %d, want %d", e.Got, e.Want)
}

// ChecksumMismatch - when content checksum does not match with what was sent from client.
type ChecksumMismatch struct {
	Want string
	Got  string
}

func (e ChecksumMismatch) Error() string {
	return "Bad checksum: Want " + e.Want + " does not match calculated " + e.Got
}

// IsChecksumMismatch matches if 'err' is hash.ChecksumMismatch