Use uniform bucket-level access

Overview

This page shows you how to enable, disable, and check the status of uniform bucket-level access on a bucket in Cloud Storage.

Required roles

To get the permissions that you need to set and manage uniform bucket-level access on a bucket, ask your administrator to grant you the Storage Admin (roles/storage.admin) role on the bucket. This predefined role contains the permissions required to set and manage uniform bucket-level access. To see the exact permissions that are required, expand the Required permissions section:

Required permissions

  • storage.buckets.get
  • storage.buckets.list
    • This permission is only required if you plan on using the Google Cloud console to perform the instructions on this page.
  • storage.buckets.update

You might also be able to get these permissions with custom roles.

For information about granting roles on buckets, see Use IAM with buckets.

Check for ACL usage

Before you enable uniform bucket-level access, use Cloud Monitoring to ensure your bucket is not using ACLs for any workflows. For more information, see Check object ACL usage.

Console

To view the metrics for a monitored resource by using the Metrics Explorer, do the following:

  1. In the Google Cloud console, go to the  Metrics explorer page:

    Go to Metrics explorer

    If you use the search bar to find this page, then select the result whose subheading is Monitoring.

  2. In the toolbar of the Google Cloud console, select your Google Cloud project. For App Hub configurations, select the App Hub host project or the app-enabled folder's management project.
  3. In the Metric element, expand the Select a metric menu, enter ACLs usage in the filter bar, and then use the submenus to select a specific resource type and metric:
    1. In the Active resources menu, select GCS Bucket.
    2. In the Active metric categories menu, select Authz.
    3. In the Active metrics menu, select ACLs usage.
    4. Click Apply.
    The fully qualified name for this metric is storage.googleapis.com/authz/acl_operations_count..
  4. Configure how the data is viewed. For example, to view your data by the ACL operation, for the Aggregation element, set the first menu to Sum and the second menu to acl_operation.

    For more information about configuring a chart, see Select metrics when using Metrics Explorer.

See storage for a complete list of metrics available for Cloud Storage. For information about time series, see Metrics, time series, and resources.

JSON API

  1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

  2. Use cURL to call the Monitoring JSON API:

    curl \
'https://monitoring.googleapis.com/v3/projects/PROJECT_ID/timeSeries?filter=metric.type%20%3D%20%22storage.googleapis.com%2Fauthz%2Facl_operations_count%22&interval.endTime=END_TIME&interval.startTime=START_TIME' \
--header 'Authorization: Bearer $(gcloud auth print-access-token)' \
--header 'Accept: application/json'

    Where:

    • PROJECT_ID is the project ID or number for which you want to view ACL usage. For example, my-project.
    • END_TIME is the end of the time range for which you want to view ACL usage. For example, 2019-11-02T15:01:23.045123456Z.
    • START_TIME is the start of the time range for which you want to view ACL usage. For example, 2016-10-02T15:01:23.045123456Z.

If the request returns an empty object {}, there is no recent ACL usage for your project.

Set uniform bucket-level access

Console

  1. In the Google Cloud console, go to the Cloud Storage Buckets page.

    Go to Buckets

  2. In the list of buckets, click the name of the bucket for which you want to enable or disable uniform bucket-level access.

  3. Select the Permissions tab near the top of the page.

  4. In the field named Access Control, click the Switch to link.

  5. In the menu that appears, select Uniform or Fine-grained.

  6. Click Save.

To learn how to get detailed error information about failed Cloud Storage operations in the Google Cloud console, see Troubleshooting.

Command line

Use the gcloud storage buckets update command:

gcloud storage buckets update gs://BUCKET_NAME --STATE

Where:

  • BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.
  • STATE is either uniform-bucket-level-access to enable uniform bucket-level access or no-uniform-bucket-level-access to disable it.

Client libraries

C++

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:

namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name) {
  gcs::BucketIamConfiguration configuration;
  configuration.uniform_bucket_level_access =
      gcs::UniformBucketLevelAccess{true, {}};
  StatusOr<gcs::BucketMetadata> updated = client.PatchBucket(
      bucket_name, gcs::BucketMetadataPatchBuilder().SetIamConfiguration(
                       std::move(configuration)));
  if (!updated) throw std::move(updated).status();

  std::cout << "Successfully enabled Uniform Bucket Level Access on bucket "
            << updated->name() << "\n";
}

The following sample disables uniform bucket-level access on a bucket:

namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name) {
  gcs::BucketIamConfiguration configuration;
  configuration.uniform_bucket_level_access =
      gcs::UniformBucketLevelAccess{false, {}};
  StatusOr<gcs::BucketMetadata> updated = client.PatchBucket(
      bucket_name, gcs::BucketMetadataPatchBuilder().SetIamConfiguration(
                       std::move(configuration)));
  if (!updated) throw std::move(updated).status();

  std::cout << "Successfully disabled Uniform Bucket Level Access on bucket "
            << updated->name() << "\n";
}

C#

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:


using Google.Apis.Storage.v1.Data;
using Google.Cloud.Storage.V1;
using System;

public class EnableUniformBucketLevelAccessSample
{
    public Bucket EnableUniformBucketLevelAccess(string bucketName = "your-unique-bucket-name")
    {
        var storage = StorageClient.Create();
        var bucket = storage.GetBucket(bucketName);
        bucket.IamConfiguration.UniformBucketLevelAccess.Enabled = true;
        bucket = storage.UpdateBucket(bucket);

        Console.WriteLine($"Uniform bucket-level access was enabled for {bucketName}.");
        return bucket;
    }
}

The following sample disables uniform bucket-level access on a bucket:


using Google.Apis.Storage.v1.Data;
using Google.Cloud.Storage.V1;
using System;

public class DisableUniformBucketLevelAccessSample
{
    public Bucket DisableUniformBucketLevelAccess(string bucketName = "your-unique-bucket-name")
    {
        var storage = StorageClient.Create();
        var bucket = storage.GetBucket(bucketName);
        bucket.IamConfiguration.UniformBucketLevelAccess.Enabled = false;
        bucket.IamConfiguration.BucketPolicyOnly.Enabled = false;
        bucket = storage.UpdateBucket(bucket);

        Console.WriteLine($"Uniform bucket-level access was disabled for {bucketName}.");
        return bucket;
    }
}

Go

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:

import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/storage"
)

// enableUniformBucketLevelAccess sets uniform bucket-level access to true.
func enableUniformBucketLevelAccess(w io.Writer, bucketName string) error {
	// bucketName := "bucket-name"
	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %w", err)
	}
	defer client.Close()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()

	bucket := client.Bucket(bucketName)
	enableUniformBucketLevelAccess := storage.BucketAttrsToUpdate{
		UniformBucketLevelAccess: &storage.UniformBucketLevelAccess{
			Enabled: true,
		},
	}
	if _, err := bucket.Update(ctx, enableUniformBucketLevelAccess); err != nil {
		return fmt.Errorf("Bucket(%q).Update: %w", bucketName, err)
	}
	fmt.Fprintf(w, "Uniform bucket-level access was enabled for %v\n", bucketName)
	return nil
}

The following sample disables uniform bucket-level access on a bucket:

import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/storage"
)

// disableUniformBucketLevelAccess sets uniform bucket-level access to false.
func disableUniformBucketLevelAccess(w io.Writer, bucketName string) error {
	// bucketName := "bucket-name"
	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %w", err)
	}
	defer client.Close()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()

	bucket := client.Bucket(bucketName)
	disableUniformBucketLevelAccess := storage.BucketAttrsToUpdate{
		UniformBucketLevelAccess: &storage.UniformBucketLevelAccess{
			Enabled: false,
		},
	}
	if _, err := bucket.Update(ctx, disableUniformBucketLevelAccess); err != nil {
		return fmt.Errorf("Bucket(%q).Update: %w", bucketName, err)
	}
	fmt.Fprintf(w, "Uniform bucket-level access was disabled for %v\n", bucketName)
	return nil
}

Java

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:


import com.google.cloud.storage.Bucket;
import com.google.cloud.storage.BucketInfo;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.Storage.BucketTargetOption;
import com.google.cloud.storage.StorageException;
import com.google.cloud.storage.StorageOptions;

public class EnableUniformBucketLevelAccess {
  public static void enableUniformBucketLevelAccess(String projectId, String bucketName)
      throws StorageException {
    // The ID of your GCP project
    // String projectId = "your-project-id";

    // The ID of your GCS bucket
    // String bucketName = "your-unique-bucket-name";

    Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();

    // first look up the bucket, so we will have its metageneration
    Bucket bucket = storage.get(bucketName);

    BucketInfo.IamConfiguration iamConfiguration =
        BucketInfo.IamConfiguration.newBuilder().setIsUniformBucketLevelAccessEnabled(true).build();

    storage.update(
        bucket.toBuilder()
            .setIamConfiguration(iamConfiguration)
            .setAcl(null)
            .setDefaultAcl(null)
            .build(),
        BucketTargetOption.metagenerationMatch());

    System.out.println("Uniform bucket-level access was enabled for " + bucketName);
  }
}

The following sample disables uniform bucket-level access on a bucket:


import com.google.cloud.storage.Bucket;
import com.google.cloud.storage.BucketInfo;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.Storage.BucketTargetOption;
import com.google.cloud.storage.StorageException;
import com.google.cloud.storage.StorageOptions;

public class DisableUniformBucketLevelAccess {
  public static void disableUniformBucketLevelAccess(String projectId, String bucketName)
      throws StorageException {
    // The ID of your GCP project
    // String projectId = "your-project-id";

    // The ID of your GCS bucket
    // String bucketName = "your-unique-bucket-name";

    Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();

    // first look up the bucket, so we will have its metageneration
    Bucket bucket = storage.get(bucketName);

    BucketInfo.IamConfiguration iamConfiguration =
        BucketInfo.IamConfiguration.newBuilder()
            .setIsUniformBucketLevelAccessEnabled(false)
            .build();

    storage.update(
        bucket.toBuilder().setIamConfiguration(iamConfiguration).build(),
        BucketTargetOption.metagenerationMatch());

    System.out.println("Uniform bucket-level access was disabled for " + bucketName);
  }
}

Node.js

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

// Enables uniform bucket-level access for the bucket
async function enableUniformBucketLevelAccess() {
  await storage.bucket(bucketName).setMetadata({
    iamConfiguration: {
      uniformBucketLevelAccess: {
        enabled: true,
      },
    },
  });

  console.log(`Uniform bucket-level access was enabled for ${bucketName}.`);
}

enableUniformBucketLevelAccess().catch(console.error);

The following sample disables uniform bucket-level access on a bucket:

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();
async function disableUniformBucketLevelAccess() {
  // Disables uniform bucket-level access for the bucket
  await storage.bucket(bucketName).setMetadata({
    iamConfiguration: {
      uniformBucketLevelAccess: {
        enabled: false,
      },
    },
  });

  console.log(`Uniform bucket-level access was disabled for ${bucketName}.`);
}

disableUniformBucketLevelAccess().catch(console.error);

PHP

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:

use Google\Cloud\Storage\StorageClient;

/**
 * Enable uniform bucket-level access.
 *
 * @param string $bucketName The name of your Cloud Storage bucket.
 *        (e.g. 'my-bucket')
 */
function enable_uniform_bucket_level_access(string $bucketName): void
{
    $storage = new StorageClient();
    $bucket = $storage->bucket($bucketName);
    $bucket->update([
        'iamConfiguration' => [
            'uniformBucketLevelAccess' => [
                'enabled' => true
            ],
        ]
    ]);
    printf('Uniform bucket-level access was enabled for %s' . PHP_EOL, $bucketName);
}

The following sample disables uniform bucket-level access on a bucket:

use Google\Cloud\Storage\StorageClient;

/**
 * Enable uniform bucket-level access.
 *
 * @param string $bucketName The name of your Cloud Storage bucket.
 *        (e.g. 'my-bucket')
 */
function disable_uniform_bucket_level_access(string $bucketName): void
{
    $storage = new StorageClient();
    $bucket = $storage->bucket($bucketName);
    $bucket->update([
        'iamConfiguration' => [
            'uniformBucketLevelAccess' => [
                'enabled' => false
            ],
        ]
    ]);
    printf('Uniform bucket-level access was disabled for %s' . PHP_EOL, $bucketName);
}

Python

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:

from google.cloud import storage


def enable_uniform_bucket_level_access(bucket_name):
    """Enable uniform bucket-level access for a bucket"""
    # bucket_name = "my-bucket"

    storage_client = storage.Client()
    bucket = storage_client.get_bucket(bucket_name)

    bucket.iam_configuration.uniform_bucket_level_access_enabled = True
    bucket.patch()

    print(
        f"Uniform bucket-level access was enabled for {bucket.name}."
    )

The following sample disables uniform bucket-level access on a bucket:

from google.cloud import storage


def disable_uniform_bucket_level_access(bucket_name):
    """Disable uniform bucket-level access for a bucket"""
    # bucket_name = "my-bucket"

    storage_client = storage.Client()
    bucket = storage_client.get_bucket(bucket_name)

    bucket.iam_configuration.uniform_bucket_level_access_enabled = False
    bucket.patch()

    print(
        f"Uniform bucket-level access was disabled for {bucket.name}."
    )

Ruby

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample enables uniform bucket-level access on a bucket:

def enable_uniform_bucket_level_access bucket_name:
  # The ID of your GCS bucket
  # bucket_name = "your-unique-bucket-name"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new
  bucket  = storage.bucket bucket_name

  bucket.uniform_bucket_level_access = true

  puts "Uniform bucket-level access was enabled for #{bucket_name}."
end

The following sample disables uniform bucket-level access on a bucket:

def disable_uniform_bucket_level_access bucket_name:
  # The ID of your GCS bucket
  # bucket_name = "your-unique-bucket-name"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new
  bucket  = storage.bucket bucket_name

  bucket.uniform_bucket_level_access = false

  puts "Uniform bucket-level access was disabled for #{bucket_name}."
end

REST APIs

JSON API

  1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

  2. Create a JSON file that contains the following information:

    {
  "iamConfiguration": {
      "uniformBucketLevelAccess": {
        "enabled": STATE
      }
  }
}

    Where STATE is either true or false.

  3. Use cURL to call the JSON API with a PATCH Bucket request:

    curl -X PATCH --data-binary @JSON_FILE_NAME \
-H "Authorization: Bearer $(gcloud auth print-access-token)" \
-H "Content-Type: application/json" \
"https://storage.googleapis.com/storage/v1/b/BUCKET_NAME?fields=iamConfiguration"

    Where:

    • JSON_FILE_NAME is the path for the file that you created in Step 2.
    • BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

XML API

The XML API cannot be used to work with uniform bucket-level access. Use one of the other Cloud Storage tools, such as the gcloud CLI, instead.

View uniform bucket-level access status

Console

  1. In the Google Cloud console, go to the Cloud Storage Buckets page.

    Go to Buckets

  2. Click the name of the bucket whose status you want to view.

  3. Click the Configuration tab.

    The uniform bucket-level access status for the bucket is found in the Access control field.

To learn how to get detailed error information about failed Cloud Storage operations in the Google Cloud console, see Troubleshooting.

Command line

Use the gcloud storage buckets describe command with the --format flag:

gcloud storage buckets describe gs://BUCKET_NAME --format="default(uniform_bucket_level_access)"

Where BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

If successful, the response looks like:

uniform_bucket_level_access: true

Client libraries

C++

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 

namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name) {
  StatusOr<gcs::BucketMetadata> bucket_metadata =
      client.GetBucketMetadata(bucket_name);
  if (!bucket_metadata) throw std::move(bucket_metadata).status();

  if (bucket_metadata->has_iam_configuration() &&
      bucket_metadata->iam_configuration()
          .uniform_bucket_level_access.has_value()) {
    gcs::UniformBucketLevelAccess uniform_bucket_level_access =
        *bucket_metadata->iam_configuration().uniform_bucket_level_access;

    std::cout << "Uniform Bucket Level Access is enabled for "
              << bucket_metadata->name() << "\n";
    std::cout << "Bucket will be locked on " << uniform_bucket_level_access
              << "\n";
  } else {
    std::cout << "Uniform Bucket Level Access is not enabled for "
              << bucket_metadata->name() << "\n";
  }
}

C#

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 


using Google.Cloud.Storage.V1;
using System;
using static Google.Apis.Storage.v1.Data.Bucket.IamConfigurationData;

public class GetUniformBucketLevelAccessSample
{
    public UniformBucketLevelAccessData GetUniformBucketLevelAccess(
        string bucketName = "your-unique-bucket-name")
    {
        var storage = StorageClient.Create();
        var bucket = storage.GetBucket(bucketName);
        var uniformBucketLevelAccess = bucket.IamConfiguration.UniformBucketLevelAccess;

        bool uniformBucketLevelAccessEnabled = uniformBucketLevelAccess.Enabled ?? false;
        if (uniformBucketLevelAccessEnabled)
        {
            Console.WriteLine($"Uniform bucket-level access is enabled for {bucketName}.");
            Console.WriteLine(
                $"Uniform bucket-level access will be locked on {uniformBucketLevelAccess.LockedTime}.");
        }
        else
        {
            Console.WriteLine($"Uniform bucket-level access is not enabled for {bucketName}.");
        }
        return uniformBucketLevelAccess;
    }
}

Go

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 

import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/storage"
)

// getUniformBucketLevelAccess gets uniform bucket-level access.
func getUniformBucketLevelAccess(w io.Writer, bucketName string) (*storage.BucketAttrs, error) {
	// bucketName := "bucket-name"
	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("storage.NewClient: %w", err)
	}
	defer client.Close()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()

	attrs, err := client.Bucket(bucketName).Attrs(ctx)
	if err != nil {
		return nil, fmt.Errorf("Bucket(%q).Attrs: %w", bucketName, err)
	}
	uniformBucketLevelAccess := attrs.UniformBucketLevelAccess
	if uniformBucketLevelAccess.Enabled {
		fmt.Fprintf(w, "Uniform bucket-level access is enabled for %q.\n", attrs.Name)
		fmt.Fprintf(w, "Bucket will be locked on %q.\n", uniformBucketLevelAccess.LockedTime)
	} else {
		fmt.Fprintf(w, "Uniform bucket-level access is not enabled for %q.\n", attrs.Name)
	}
	return attrs, nil
}

Java

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 


import com.google.cloud.storage.Bucket;
import com.google.cloud.storage.BucketInfo;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageException;
import com.google.cloud.storage.StorageOptions;
import java.util.Date;

public class GetUniformBucketLevelAccess {
  public static void getUniformBucketLevelAccess(String projectId, String bucketName)
      throws StorageException {
    // The ID of your GCP project
    // String projectId = "your-project-id";

    // The ID of your GCS bucket
    // String bucketName = "your-unique-bucket-name";

    Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();
    Bucket bucket =
        storage.get(
            bucketName, Storage.BucketGetOption.fields(Storage.BucketField.IAMCONFIGURATION));
    BucketInfo.IamConfiguration iamConfiguration = bucket.getIamConfiguration();

    Boolean enabled = iamConfiguration.isUniformBucketLevelAccessEnabled();
    Date lockedTime = new Date(iamConfiguration.getUniformBucketLevelAccessLockedTime());

    if (enabled != null && enabled) {
      System.out.println("Uniform bucket-level access is enabled for " + bucketName);
      System.out.println("Bucket will be locked on " + lockedTime);
    } else {
      System.out.println("Uniform bucket-level access is disabled for " + bucketName);
    }
  }
}

Node.js

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

async function getUniformBucketLevelAccess() {
  // Gets Bucket Metadata and checks if uniform bucket-level access is enabled.
  const [metadata] = await storage.bucket(bucketName).getMetadata();

  if (metadata.iamConfiguration) {
    const uniformBucketLevelAccess =
      metadata.iamConfiguration.uniformBucketLevelAccess;
    console.log(`Uniform bucket-level access is enabled for ${bucketName}.`);
    console.log(
      `Bucket will be locked on ${uniformBucketLevelAccess.lockedTime}.`
    );
  } else {
    console.log(
      `Uniform bucket-level access is not enabled for ${bucketName}.`
    );
  }
}

getUniformBucketLevelAccess().catch(console.error);

PHP

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 

use Google\Cloud\Storage\StorageClient;

/**
 * Enable uniform bucket-level access.
 *
 * @param string $bucketName The name of your Cloud Storage bucket.
 *        (e.g. 'my-bucket')
 */
function get_uniform_bucket_level_access(string $bucketName): void
{
    $storage = new StorageClient();
    $bucket = $storage->bucket($bucketName);
    $bucketInformation = $bucket->info();
    $ubla = $bucketInformation['iamConfiguration']['uniformBucketLevelAccess'];
    if ($ubla['enabled']) {
        printf('Uniform bucket-level access is enabled for %s' . PHP_EOL, $bucketName);
        printf('Uniform bucket-level access will be locked on %s' . PHP_EOL, $ubla['LockedTime']);
    } else {
        printf('Uniform bucket-level access is disabled for %s' . PHP_EOL, $bucketName);
    }
}

Python

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 

from google.cloud import storage


def get_uniform_bucket_level_access(bucket_name):
    """Get uniform bucket-level access for a bucket"""
    # bucket_name = "my-bucket"

    storage_client = storage.Client()
    bucket = storage_client.get_bucket(bucket_name)
    iam_configuration = bucket.iam_configuration

    if iam_configuration.uniform_bucket_level_access_enabled:
        print(
            f"Uniform bucket-level access is enabled for {bucket.name}."
        )
        print(
            "Bucket will be locked on {}.".format(
                iam_configuration.uniform_bucket_level_locked_time
            )
        )
    else:
        print(
            f"Uniform bucket-level access is disabled for {bucket.name}."
        )

Ruby

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 

def get_uniform_bucket_level_access bucket_name:
  # The ID of your GCS bucket
  # bucket_name = "your-unique-bucket-name"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new
  bucket  = storage.bucket bucket_name

  if bucket.uniform_bucket_level_access?
    puts "Uniform bucket-level access is enabled for #{bucket_name}."
    puts "Bucket will be locked on #{bucket.uniform_bucket_level_access_locked_at}."
  else
    puts "Uniform bucket-level access is disabled for #{bucket_name}."
  end
end

REST APIs

JSON API

  1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

  2. Use cURL to call the JSON API with a GET Bucket request that includes the desired fields:

    curl -X GET -H "Authorization: Bearer $(gcloud auth print-access-token)" \
"https://storage.googleapis.com/storage/v1/b/BUCKET_NAME?fields=iamConfiguration"

    Where BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

    If the bucket has uniform bucket-level access enabled, the response looks like the following example:

    {
  "iamConfiguration": {
      "uniformBucketLevelAccess": {
        "enabled": true,
        "lockedTime": "LOCK_DATE"
      }
    }
  }

XML API

The XML API cannot be used to work with uniform bucket-level access. Use one of the other Cloud Storage tools, such as the gcloud CLI, instead.

What's next