private final String username;
        private final String domain;
        private final AuthType authType;
        private final long timestamp;
        private final String clientAddress;
        private final String serverAddress;

        public AuthenticationMetadata(String username, String domain, AuthType authType, String clientAddress, String serverAddress) {
            this.username = username;

		}
	}

	authType := getRequestAuthType(r)
	var signatureVersion string
	switch authType {
	case authTypeSignedV2, authTypePresignedV2:
		signatureVersion = signV2Algorithm
	case authTypeSigned, authTypePresigned, authTypeStreamingSigned, authTypePostPolicy:
		signatureVersion = signV4Algorithm
	}

	var authtype string
	switch authType {
	case authTypePresignedV2, authTypePresigned:

     *
     * @param authType the type of authorization data
     * @param token the authorization data token
     * @param keys the Kerberos keys for decryption
     * @return a list of parsed authorization data
     * @throws PACDecodingException if the data cannot be decoded
     */

		r.Method == http.MethodPut
}

// Authorization type.
//
//go:generate stringer -type=authType -trimprefix=authType $GOFILE
type authType int

// List of all supported auth types.
const (
	authTypeUnknown authType = iota
	authTypeAnonymous
	authTypePresigned
	authTypePresignedV2
	authTypePostPolicy
	authTypeStreamingSigned
	authTypeSigned

            ASN1Integer authType = ASN1Util.as(ASN1Integer.class, ASN1Util.as(ASN1TaggedObject.class, authElement, 0));
            DEROctetString authData = ASN1Util.as(DEROctetString.class, ASN1Util.as(ASN1TaggedObject.class, authElement, 1));

            this.authorizations.addAll(KerberosAuthData.parse(authType.getValue().intValue(), authData.getOctets(), keys));
        }
    }

    /**

                    ASN1Integer authType = ASN1Util.as(ASN1Integer.class, ASN1Util.as(ASN1TaggedObject.class, authElement, 0));
                    DEROctetString authData = ASN1Util.as(DEROctetString.class, ASN1Util.as(ASN1TaggedObject.class, authElement, 1));

                    this.userAuthorizations.addAll(KerberosAuthData.parse(authType.getValue().intValue(), authData.getOctets(), keys));
                }

        ASN1EncodableVector authVector = new ASN1EncodableVector();
        ASN1EncodableVector elementVector = new ASN1EncodableVector();
        elementVector.add(new DERTaggedObject(0, new ASN1Integer(1))); // authType
        elementVector.add(new DERTaggedObject(1, new DEROctetString(new byte[] { 0x01, 0x02 }))); // authData
        authVector.add(new DERSequence(elementVector));

	)
	if s3Error = isPutActionAllowed(ctx, rAuthType, bucket, object, r, policy.PutObjectAction); s3Error != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
		return
	}

	switch rAuthType {
	case authTypeStreamingSigned, authTypeStreamingSignedTrailer:
		// Initialize stream signature verifier.
		reader, s3Error = newSignV4ChunkedReader(r, rAuthType == authTypeStreamingSignedTrailer)

	if s3Err = isPutActionAllowed(ctx, rAuthType, bucket, object, r, policy.PutObjectAction); s3Err != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}

	switch rAuthType {
	case authTypeStreamingSigned, authTypeStreamingSignedTrailer:
		// Initialize stream signature verifier.
		rd, s3Err = newSignV4ChunkedReader(r, rAuthType == authTypeStreamingSignedTrailer)