oak-blob-cloud-azure/src/main/java/org/apache/jackrabbit/oak/blob/cloud/azure/blobstorage/AzureBlobStoreBackend.java [1004:1051]:
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            try {
                byte[] secret = getOrCreateReferenceKey();
                String uploadToken = new DataRecordUploadToken(blobId, uploadId).getEncodedToken(secret);
                return new DataRecordUpload() {
                    @Override
                    @NotNull
                    public String getUploadToken() {
                        return uploadToken;
                    }

                    @Override
                    public long getMinPartSize() {
                        return minPartSize;
                    }

                    @Override
                    public long getMaxPartSize() {
                        return maxPartSize;
                    }

                    @Override
                    @NotNull
                    public Collection<URI> getUploadURIs() {
                        return uploadPartURIs;
                    }
                };
            } catch (DataStoreException e) {
                LOG.warn("Unable to obtain data store key");
            }
        }

        return null;
    }

    DataRecord completeHttpUpload(@NotNull String uploadTokenStr)
            throws DataRecordUploadException, DataStoreException {

        if (Strings.isNullOrEmpty(uploadTokenStr)) {
            throw new IllegalArgumentException("uploadToken required");
        }

        DataRecordUploadToken uploadToken = DataRecordUploadToken.fromEncodedToken(uploadTokenStr, getOrCreateReferenceKey());
        String key = uploadToken.getBlobId();
        DataIdentifier blobId = new DataIdentifier(getIdentifierName(key));

        DataRecord record = null;
        try {
            record = getRecord(blobId);
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oak-blob-cloud/src/main/java/org/apache/jackrabbit/oak/blob/cloud/s3/S3Backend.java [911:959]:
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            try {
                byte[] secret = getOrCreateReferenceKey();
                String uploadToken = new DataRecordUploadToken(blobId, uploadId).getEncodedToken(secret);

                return new DataRecordUpload() {
                    @Override
                    @NotNull
                    public String getUploadToken() {
                        return uploadToken;
                    }

                    @Override
                    public long getMinPartSize() {
                        return minPartSize;
                    }

                    @Override
                    public long getMaxPartSize() {
                        return maxPartSize;
                    }

                    @Override
                    @NotNull
                    public Collection<URI> getUploadURIs() {
                        return uploadPartURIs;
                    }
                };
            } catch (DataStoreException e) {
                LOG.warn("Unable to obtain data store key");
            }
        }

        return null;
    }

    DataRecord completeHttpUpload(@NotNull String uploadTokenStr)
            throws DataRecordUploadException, DataStoreException {

        if (Strings.isNullOrEmpty(uploadTokenStr)) {
            throw new IllegalArgumentException("uploadToken required");
        }

        DataRecordUploadToken uploadToken = DataRecordUploadToken.fromEncodedToken(uploadTokenStr, getOrCreateReferenceKey());
        String key = uploadToken.getBlobId();
        DataIdentifier blobId = new DataIdentifier(getIdentifierName(key));

        DataRecord record = null;
        try {
            record = getRecord(blobId);
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