}

            SnapshotVersion sv = SnapshotVersion.newBuilder()
                    .classifier(artifact.getClassifier())
                    .extension(artifact.getExtension())
                    .version(version)
                    .updated(lastUpdated)
                    .build();

            versions.put(getKey(sv.getClassifier(), sv.getExtension()), sv);
        }

        artifacts.clear();

            SnapshotVersion sv = SnapshotVersion.newBuilder()
                    .classifier(artifact.getClassifier())
                    .extension(artifact.getExtension())
                    .version(getVersion())
                    .updated(lastUpdated)
                    .build();
            versions.put(getKey(sv.getClassifier(), sv.getExtension()), sv);
        }

	// to make parsing easier.
	v4Auth = strings.ReplaceAll(v4Auth, " ", "")
	if v4Auth == "" {
		return sv, ErrAuthHeaderEmpty
	}

	// Verify if the header algorithm is supported or not.
	if !strings.HasPrefix(v4Auth, signV4Algorithm) {
		return sv, ErrSignatureVersionNotSupported
	}

	// Strip off the Algorithm prefix.
	v4Auth = strings.TrimPrefix(v4Auth, signV4Algorithm)

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