CODEWITHSUNDEEP
javagoogle-cloud-platformgoogle-cloud-storagebucket
Dimas Angga Saputra
Dimas Angga Saputra

Reputation: 221

Url to download file from GCS bucket still accessible after deleting using Java

So I have problem when deleting file from GCS bucket, I create my file using java, the code is like:

public void upload(String projectId, String bucketName, String filePath, String fileName)
  throws IOException, URISyntaxException {

File f = new File(gcsCredDirectory+gcsCredFileName);
if (!f.exists()) {
  f.mkdirs();
}
try(InputStream is = new FileInputStream(f)) {
  StorageOptions storageOptions = StorageOptions.newBuilder()
      .setProjectId(projectId).setCredentials(fromStream(is)).build();
  Storage storage = storageOptions.getService();
  BlobId blobId = BlobId.of(bucketName, fileName);
  BlobInfo blobInfo = BlobInfo.newBuilder(blobId).build();
  Blob result = storage.create(blobInfo, Files.readAllBytes(Paths.get(filePath)));
  URL url = storage.signUrl(blobInfo, MAX_EXPIRED_DATE, TimeUnit.DAYS, SignUrlOption.withV4Signature());
} catch (Exception e) {
  LOGGER.error("ERROR at GoogleCloudStorageServiceImpl.upload cause : ", e);
  throw e;
}

}

The code to create went well, I get the Url to download the file I uploaded and actually can download the file, but after I deleting the file through this code:

public boolean delete(String projectId, String bucketName, String fileName) {
    File f = new File(gcsCredDir+gcsCredFileName);
    if (!f.exists()) {
      f.mkdirs();
    }
    try(InputStream is = new FileInputStream(f)) {
      StorageOptions storageOptions = StorageOptions.newBuilder()
          .setProjectId(projectId)
          .setCredentials(fromStream(is))
          .build();
      boolean result = storageOptions.getService().delete(bucketName, fileName);
      LOGGER.info("Object " + fileName + " was deleted from " + bucketName);
      return result;
    } catch (Exception e) {
      return false;
    }
  }

I was able to see the log Object + fileName + was deleted from + bucketName, but when I access the Url to download the file, I can still download it. I expect the download should failed because the file was deleted.

Any advice?

Thank you

Upvotes: 0

Views: 869

Answers (1)

Rob Evans
Rob Evans

Reputation: 2874

Google has its own caches which will store what you upload for some time after you delete it. You need to override the settings using Headers on upload. Set Cache-Control: max-age=0, no-cache. You can also specify public or private.

  • public means intermediate servers may cache the result (for faster response times).
  • private means only the requesting client may cache the response, but not intermediate servers. This is usually set to enable a client to get a fresh copy each time the request is made.

To try and force the cache to drop the data, some servers accept PURGE requests. These can be issued via curl -vv -X PURGE http(s)://example.com/path/to/resource

Edit:

You can set the cache control headers using gsutil: https://cloud.google.com/storage/docs/gsutil/addlhelp/WorkingWithObjectMetadata

Upvotes: 3

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