Récupérer une image à flouter depuis Cloud Storage, puis l'importer dans un bucket de stockage

Ce tutoriel explique comment utiliser Cloud Run, l'API Cloud Vision et ImageMagick pour détecter et flouter les images choquantes importées dans un bucket Cloud Storage.

En savoir plus

Pour obtenir une documentation détaillée incluant cet exemple de code, consultez les articles suivants :

Exemple de code

Go

Pour vous authentifier auprès de Cloud Run, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.


// blur blurs the image stored at gs://inputBucket/name and stores the result in
// gs://outputBucket/name.
func blur(ctx context.Context, inputBucket, outputBucket, name string) error {
	inputBlob := storageClient.Bucket(inputBucket).Object(name)
	r, err := inputBlob.NewReader(ctx)
	if err != nil {
		return fmt.Errorf("NewReader: %w", err)
	}

	outputBlob := storageClient.Bucket(outputBucket).Object(name)
	w := outputBlob.NewWriter(ctx)
	defer w.Close()

	// Use - as input and output to use stdin and stdout.
	cmd := exec.Command("convert", "-", "-blur", "0x8", "-")
	cmd.Stdin = r
	cmd.Stdout = w

	if err := cmd.Run(); err != nil {
		return fmt.Errorf("cmd.Run: %w", err)
	}

	log.Printf("Blurred image uploaded to gs://%s/%s", outputBlob.BucketName(), outputBlob.ObjectName())

	return nil
}

Java

  // Blurs the file described by blobInfo using ImageMagick,
  // and uploads it to the blurred bucket.
  public static void blur(BlobInfo blobInfo) throws IOException {
    String bucketName = blobInfo.getBucket();
    String fileName = blobInfo.getName();
    // Download image
    Blob blob = storage.get(BlobId.of(bucketName, fileName));
    Path download = Paths.get("/tmp/", fileName);
    blob.downloadTo(download);

    // Construct the command.
    List<String> args = new ArrayList<>();
    args.add("convert");
    args.add(download.toString());
    args.add("-blur");
    args.add("0x8");
    Path upload = Paths.get("/tmp/", "blurred-" + fileName);
    args.add(upload.toString());
    try {
      ProcessBuilder pb = new ProcessBuilder(args);
      Process process = pb.start();
      process.waitFor();
    } catch (Exception e) {
      System.out.println(String.format("Error: %s", e.getMessage()));
    }

    // Upload image to blurred bucket.
    BlobId blurredBlobId = BlobId.of(BLURRED_BUCKET_NAME, fileName);
    BlobInfo blurredBlobInfo =
        BlobInfo.newBuilder(blurredBlobId).setContentType(blob.getContentType()).build();
    try {
      byte[] blurredFile = Files.readAllBytes(upload);
      Blob blurredBlob = storage.create(blurredBlobInfo, blurredFile);
      System.out.println(
          String.format("Blurred image uploaded to: gs://%s/%s", BLURRED_BUCKET_NAME, fileName));
    } catch (Exception e) {
      System.out.println(String.format("Error in upload: %s", e.getMessage()));
    }

    // Remove images from fileSystem
    Files.delete(download);
    Files.delete(upload);
  }
}

Node.js

// Blurs the given file using ImageMagick, and uploads it to another bucket.
const blurImage = async (file, blurredBucketName) => {
  const tempLocalPath = `/tmp/${path.parse(file.name).base}`;

  // Download file from bucket.
  try {
    await file.download({destination: tempLocalPath});

    console.log(`Downloaded ${file.name} to ${tempLocalPath}.`);
  } catch (err) {
    throw new Error(`File download failed: ${err}`);
  }

  await new Promise((resolve, reject) => {
    gm(tempLocalPath)
      .blur(0, 16)
      .write(tempLocalPath, (err, stdout) => {
        if (err) {
          console.error('Failed to blur image.', err);
          reject(err);
        } else {
          console.log(`Blurred image: ${file.name}`);
          resolve(stdout);
        }
      });
  });

  // Upload result to a different bucket, to avoid re-triggering this function.
  const blurredBucket = storage.bucket(blurredBucketName);

  // Upload the Blurred image back into the bucket.
  const gcsPath = `gs://${blurredBucketName}/${file.name}`;
  try {
    await blurredBucket.upload(tempLocalPath, {destination: file.name});
    console.log(`Uploaded blurred image to: ${gcsPath}`);
  } catch (err) {
    throw new Error(`Unable to upload blurred image to ${gcsPath}: ${err}`);
  }

  // Delete the temporary file.
  const unlink = promisify(fs.unlink);
  return unlink(tempLocalPath);
};

Python

def __blur_image(current_blob):
    """Blurs the given file using ImageMagick.

    Args:
        current_blob: a Cloud Storage blob
    """
    file_name = current_blob.name
    _, temp_local_filename = tempfile.mkstemp()

    # Download file from bucket.
    current_blob.download_to_filename(temp_local_filename)
    print(f"Image {file_name} was downloaded to {temp_local_filename}.")

    # Blur the image using ImageMagick.
    with Image(filename=temp_local_filename) as image:
        image.resize(*image.size, blur=16, filter="hamming")
        image.save(filename=temp_local_filename)

    print(f"Image {file_name} was blurred.")

    # Upload result to a second bucket, to avoid re-triggering the function.
    # You could instead re-upload it to the same bucket + tell your function
    # to ignore files marked as blurred (e.g. those with a "blurred" prefix)
    blur_bucket_name = os.getenv("BLURRED_BUCKET_NAME")
    blur_bucket = storage_client.bucket(blur_bucket_name)
    new_blob = blur_bucket.blob(file_name)
    new_blob.upload_from_filename(temp_local_filename)
    print(f"Blurred image uploaded to: gs://{blur_bucket_name}/{file_name}")

    # Delete the temporary file.
    os.remove(temp_local_filename)

Étapes suivantes

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