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RotateObjectEncryptionKey.java
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RotateObjectEncryptionKey.java
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/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.storage.object;
// [START storage_rotate_encryption_key]
import com.google.cloud.storage.Blob;
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
public class RotateObjectEncryptionKey {
public static void rotateObjectEncryptionKey(
String projectId,
String bucketName,
String objectName,
String oldEncryptionKey,
String newEncryptionKey) {
// The ID of your GCP project
// String projectId = "your-project-id";
// The ID of your GCS bucket
// String bucketName = "your-unique-bucket-name";
// The ID of your GCS object
// String objectName = "your-object-name";
// The Base64 encoded AES-256 encryption key originally used to encrypt the object. See the
// documentation
// on Customer-Supplied Encryption keys for more info:
// https://cloud.google.com/storage/docs/encryption/using-customer-supplied-keys
// String oldEncryptionKey = "TIbv/fjexq+VmtXzAlc63J4z5kFmWJ6NdAPQulQBT7g="
// The new encryption key to use
// String newEncryptionKey = "0mMWhFvQOdS4AmxRpo8SJxXn5MjFhbz7DkKBUdUIef8="
Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();
BlobId blobId = BlobId.of(bucketName, objectName);
Blob blob = storage.get(blobId);
if (blob == null) {
System.out.println("The object " + objectName + " wasn't found in " + bucketName);
return;
}
// Optional: set a generation-match precondition to avoid potential race
// conditions and data corruptions. The request to upload returns a 412 error if
// the object's generation number does not match your precondition.
Storage.BlobSourceOption precondition =
Storage.BlobSourceOption.generationMatch(blob.getGeneration());
// You can't change an object's encryption key directly, the only way is to overwrite the object
Storage.CopyRequest request =
Storage.CopyRequest.newBuilder()
.setSource(blobId)
.setSourceOptions(
Storage.BlobSourceOption.decryptionKey(oldEncryptionKey), precondition)
.setTarget(blobId, Storage.BlobTargetOption.encryptionKey(newEncryptionKey))
.build();
storage.copy(request);
System.out.println(
"Rotated encryption key for object " + objectName + "in bucket " + bucketName);
}
}
// [END storage_rotate_encryption_key]