Managing HMAC keys for service accounts

Go to concepts

This page shows you how to create, disable, and delete Hash-based Message Authentication Code (HMAC) keys associated with service accounts in your project.

Prerequisites

Before using this feature in Cloud Storage, you should:

1. Have sufficient permission to work with HMAC keys in the desired project:

   • If you own the project, you most likely have the necessary permissions.

   • You should have the IAM permissions that are prefixed with storage.hmacKeys for the project. See Using IAM Permissions for instructions on how to get a role, such as Storage HMAC Key Admin, that has these permissions.

2. Have a service account in your project that you intend to create HMAC keys for. See Creating a service account if you don't currently have one.

Creating an HMAC key

Important: When you create an HMAC key, you are given the secret for that key, which you must store securely. If you lose the secret, you are no longer able to use the HMAC key to authorize requests.

To create an HMAC key for a service account:

Console

1. In the Google Cloud Console, go to the Cloud Storage Browser page.
   

   Go to Browser

2. Click Settings.

3. Select the Interoperability tab.

4. Click + Create a key for a service account.

5. Select the service account you want the HMAC key to be associated with.

6. Click Create key.

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

gsutil

Use the hmac create command:

gsutil hmac create SERVICE_ACCOUNT_EMAIL

Where SERVICE_ACCOUNT_EMAIL is the email address associated with your service account. For example, [e-mail].

If successful, the response looks like:

AccessId: GOOGTS7C7FUP3AIRVJTE2BCDKINBTES3HC2GY5CBFJDCQ2SYHV6A6XXVTJFSA
SecretKey: de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9

Code samples

C++

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

View on GitHub Feedback

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
return [](gcs::Client client, std::string const& service_account_email) {
  StatusOr<std::pair<gcs::HmacKeyMetadata, std::string>> key_info =
      client.CreateHmacKey(service_account_email);
  if (!key_info) throw std::runtime_error(key_info.status().message());

  std::cout << "The base64 encoded secret is: " << key_info->second
            << "\nDo not miss that secret, there is no API to recover it."
            << "\nThe HMAC key metadata is: " << key_info->first << "\n";
  return key_info->first.access_id();
}

C#

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

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

public class CreateHmacKeySample
{
    public HmacKey CreateHmacKey(
        string projectId = "your-project-id",
        string serviceAccountEmail = "[e-mail]")
    {
        var storage = StorageClient.Create();
        var key = storage.CreateHmacKey(projectId, serviceAccountEmail);

        var secret = key.Secret;
        var metadata = key.Metadata;

        Console.WriteLine($"The Base64 encoded secret is: {secret}");
        Console.WriteLine("Make sure to save that secret, there's no API to recover it.");
        Console.WriteLine("The HMAC key metadata is:");
        Console.WriteLine($"ID: {metadata.Id}");
        Console.WriteLine($"Access ID: {metadata.AccessId}");
        Console.WriteLine($"Project ID: {metadata.ProjectId}");
        Console.WriteLine($"Service Account Email: {metadata.ServiceAccountEmail}");
        Console.WriteLine($"State: {metadata.State}");
        Console.WriteLine($"Time Created: {metadata.TimeCreated}");
        Console.WriteLine($"Time Updated: {metadata.Updated}");
        Console.WriteLine($"ETag: {metadata.ETag}");
        return key;
    }
}

Go

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

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

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

// createHMACKey creates a new HMAC key using the given project and service account.
func createHMACKey(w io.Writer, projectID string, serviceAccountEmail string) (*storage.HMACKey, error) {
	ctx := context.Background()

	// Initialize client.
	client, err := storage.NewClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("storage.NewClient: %v", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	ctx, cancel := context.WithTimeout(ctx, time.Minute)
	defer cancel()
	key, err := client.CreateHMACKey(ctx, projectID, serviceAccountEmail)
	if err != nil {
		return nil, fmt.Errorf("CreateHMACKey: %v", err)
	}

	fmt.Fprintf(w, "%s\n", key)
	fmt.Fprintf(w, "The base64 encoded secret is %s\n", key.Secret)
	fmt.Fprintln(w, "Do not miss that secret, there is no API to recover it.")
	fmt.Fprintln(w, "The HMAC key metadata is")
	fmt.Fprintf(w, "%+v", key)

	return key, nil
}

Java

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

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// Instantiate a Google Cloud Storage client
Storage storage = StorageOptions.getDefaultInstance().getService();

// The service account email for which the new HMAC key will be created.
// String serviceAccountEmail = "[e-mail]";
//
// The ID of the project to which the service account belongs.
// String projectId = "project-id";

ServiceAccount account = ServiceAccount.of(serviceAccountEmail);
HmacKey hmacKey =
    storage.createHmacKey(account, Storage.CreateHmacKeyOption.projectId(projectId));

String secret = hmacKey.getSecretKey();
HmacKeyMetadata metadata = hmacKey.getMetadata();

System.out.println("The Base64 encoded secret is: " + secret);
System.out.println("Do not miss that secret, there is no API to recover it.");
System.out.println("The HMAC key metadata is:");
System.out.println("ID: " + metadata.getId());
System.out.println("Access ID: " + metadata.getAccessId());
System.out.println("Project ID: " + metadata.getProjectId());
System.out.println("Service Account Email: " + metadata.getServiceAccount().getEmail());
System.out.println("State: " + metadata.getState().toString());
System.out.println("Time Created: " + new Date(metadata.getCreateTime()).toString());
System.out.println("Time Updated: " + new Date(metadata.getUpdateTime()).toString());
System.out.println("ETag: " + metadata.getEtag());

Node.js

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

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/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The service account email for which the new HMAC key will be created
// const serviceAccountEmail = '[e-mail]';

// The ID of the project to which the service account belongs
// const projectId = 'project-id';

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

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

// Create HMAC SA Key
async function createHmacKey() {
  const [hmacKey, secret] = await storage.createHmacKey(serviceAccountEmail, {
    projectId,
  });

  console.log(`The base64 encoded secret is: ${secret}`);
  console.log('Do not miss that secret, there is no API to recover it.');
  console.log('The HMAC key metadata is:');
  for (const [key, value] of Object.entries(hmacKey.metadata)) {
    console.log(`${key}: ${value}`);
  }
}

PHP

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

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use Google\Cloud\Storage\StorageClient;

/**
 * Create a new HMAC key.
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 * @param string $serviceAccountEmail Service account email to associate with the new HMAC key.
 */
function create_hmac_key($projectId, $serviceAccountEmail)
{
    // $projectId = 'my-project-id';
    // $serviceAccountEmail = '[e-mail]';

    $storage = new StorageClient();
    // By default createHmacKey will use the projectId used by StorageClient().
    $hmacKeyCreated = $storage->createHmacKey($serviceAccountEmail, ['projectId' => $projectId]);

    printf('The base64 encoded secret is: %s' . PHP_EOL, $hmacKeyCreated->secret());
    print('Do not miss that secret, there is no API to recover it.' . PHP_EOL);
    printf('HMAC key Metadata: %s' . PHP_EOL, print_r($hmacKeyCreated->hmacKey()->info(), true));
}

Python

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

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from google.cloud import storage


def create_key(project_id, service_account_email):
    """
    Create a new HMAC key using the given project and service account.
    """
    # project_id = 'Your Google Cloud project ID'
    # service_account_email = 'Service account used to generate HMAC key'

    storage_client = storage.Client(project=project_id)

    hmac_key, secret = storage_client.create_hmac_key(
        service_account_email=service_account_email, project_id=project_id
    )

    print("The base64 encoded secret is {}".format(secret))
    print("Do not miss that secret, there is no API to recover it.")
    print("The HMAC key metadata is:")
    print("Service Account Email: {}".format(hmac_key.service_account_email))
    print("Key ID: {}".format(hmac_key.id))
    print("Access ID: {}".format(hmac_key.access_id))
    print("Project ID: {}".format(hmac_key.project))
    print("State: {}".format(hmac_key.state))
    print("Created At: {}".format(hmac_key.time_created))
    print("Updated At: {}".format(hmac_key.updated))
    print("Etag: {}".format(hmac_key.etag))
    return hmac_key

Ruby

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

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def create_hmac_key service_account_email:
  # The service account email used to generate an HMAC key
  # service_account_email = "[e-mail]"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new

  # By default Storage#create_hmac_key uses the Storage client project_id
  hmac_key = storage.create_hmac_key service_account_email

  puts "The base64 encoded secret is: #{hmac_key.secret}"
  puts "Do not miss that secret, there is no API to recover it."
  puts "\nThe HMAC key metadata is:"
  puts "Key ID:                #{hmac_key.id}"
  puts "Service Account Email: #{hmac_key.service_account_email}"
  puts "Access ID:             #{hmac_key.access_id}"
  puts "Project ID:            #{hmac_key.project_id}"
  puts "Active:                #{hmac_key.active?}"
  puts "Created At:            #{hmac_key.created_at}"
  puts "Updated At:            #{hmac_key.updated_at}"
  puts "Etag:                  #{hmac_key.etag}"
end

REST APIs

JSON API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

2. Use cURL to call the JSON API with a POST hmacKeys request,:

   curl -X POST \
     -H "Authorization: Bearer OAUTH2_TOKEN" \
     "https://storage.googleapis.com/storage/v1/projects/PROJECT_ID/hmacKeys?serviceAccountEmail=SERVICE_ACCOUNT_EMAIL"

   Where:

   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • PROJECT_ID is the ID for the project associated with the key you want to create. For example, my-pet-project.
   • SERVICE_ACCOUNT_EMAIL is the email address associated with your service account. For example, [e-mail].

XML API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

2. Use cURL to call the XML API with a POST HMAC Key request:

   curl -X POST \
     -H "Authorization: Bearer OAUTH2_TOKEN" \
     "https://storage.googleapis.com/?Action=CreateAccessKey&UserName=SERVICE_ACCOUNT_EMAIL"

   Where:

   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • SERVICE_ACCOUNT_EMAIL is the email address associated with your service account. For example, [e-mail].

Getting HMAC key information

To list the HMAC keys for a project, and get information about the keys:

Console

1. In the Google Cloud Console, go to the Cloud Storage Browser page.
   

   Go to Browser

2. Click Settings.

3. Select the Interoperability tab.

gsutil

1. Use the hmac list command to list hmac keys in your project:

   gsutil hmac list

   If successful, gsutil returns a list of hmac key access IDs, along with the service account associated with each key.

2. Use the hmac get command to retrieve metadata for a specific key:

   gsutil hmac get KEY_ACCESS_ID 

   Where KEY_ACCESS_ID is the access ID for the desired key.

Code samples

C++

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

The following sample retrieves a list of HMAC keys associated with a project:

google/cloud/storage/examples/storage_service_account_samples.cc

View on GitHub Feedback

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client) {
  int count = 0;
  gcs::ListHmacKeysReader hmac_keys_list = client.ListHmacKeys();
  for (auto const& key : hmac_keys_list) {
    if (!key) throw std::runtime_error(key.status().message());

    std::cout << "service_account_email = " << key->service_account_email()
              << "\naccess_id = " << key->access_id() << "\n";
    ++count;
  }
  if (count == 0) {
    std::cout << "No HMAC keys in default project\n";
  }
}

The following sample retrieves information for a specific HMAC key:

google/cloud/storage/examples/storage_service_account_samples.cc

View on GitHub Feedback

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& access_id) {
  StatusOr<gcs::HmacKeyMetadata> hmac_key = client.GetHmacKey(access_id);
  if (!hmac_key) throw std::runtime_error(hmac_key.status().message());

  std::cout << "The HMAC key metadata is: " << *hmac_key << "\n";
}

C#

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

The following sample retrieves a list of HMAC keys associated with a project:

storage/api/Storage.Samples/ListHmacKeys.cs

View on GitHub Feedback

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

public class ListHmacKeysSample
{
    public IEnumerable<HmacKeyMetadata> ListHmacKeys(string projectId = "your-project-id")
    {
        var storage = StorageClient.Create();
        var keys = storage.ListHmacKeys(projectId);

        foreach (var key in keys)
        {
            Console.WriteLine($"Service Account Email: {key.ServiceAccountEmail}");
            Console.WriteLine($"Access ID: {key.AccessId}");
        }
        return keys;
    }
}

The following sample retrieves information for a specific HMAC key:

storage/api/Storage.Samples/GetHmacKey.cs

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

public class GetHmacKeySample
{
    public HmacKeyMetadata GetHmacKey(
        string projectId = "your-project-id",
        string accessId = "your-access-id")
    {
        var storage = StorageClient.Create();
        var metadata = storage.GetHmacKey(projectId, accessId);

        Console.WriteLine("The HMAC key metadata is:");
        Console.WriteLine($"ID: {metadata.Id}");
        Console.WriteLine($"Access ID: {metadata.AccessId}");
        Console.WriteLine($"Project ID: {metadata.ProjectId}");
        Console.WriteLine($"Service Account Email: {metadata.ServiceAccountEmail}");
        Console.WriteLine($"State: {metadata.State}");
        Console.WriteLine($"Time Created: {metadata.TimeCreated}");
        Console.WriteLine($"Time Updated: {metadata.Updated}");
        Console.WriteLine($"ETag: {metadata.ETag}");
        return metadata;
    }
}

Go

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

The following sample retrieves a list of HMAC keys associated with a project:

storage/service_account/hmac/list.go

View on GitHub Feedback

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

	"cloud.google.com/go/storage"
	"google.golang.org/api/iterator"
)

// listHMACKeys lists all HMAC keys associated with the project.
func listHMACKeys(w io.Writer, projectID string) ([]*storage.HMACKey, error) {
	ctx := context.Background()

	// Initialize client.
	client, err := storage.NewClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("storage.NewClient: %v", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	ctx, cancel := context.WithTimeout(ctx, time.Minute)
	defer cancel()
	iter := client.ListHMACKeys(ctx, projectID)
	var keys []*storage.HMACKey
	for {
		key, err := iter.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return nil, fmt.Errorf("ListHMACKeys: %v", err)
		}
		fmt.Fprintf(w, "Service Account Email: %s\n", key.ServiceAccountEmail)
		fmt.Fprintf(w, "Access ID: %s\n", key.AccessID)

		keys = append(keys, key)
	}

	return keys, nil
}

The following sample retrieves information for a specific HMAC key:

storage/service_account/hmac/get.go

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

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

// getHMACKey retrieves the HMACKeyMetadata with the given access id.
func getHMACKey(w io.Writer, accessID string, projectID string) (*storage.HMACKey, error) {
	ctx := context.Background()

	// Initialize client.
	client, err := storage.NewClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("storage.NewClient: %v", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	handle := client.HMACKeyHandle(projectID, accessID)
	ctx, cancel := context.WithTimeout(ctx, time.Minute)
	defer cancel()
	key, err := handle.Get(ctx)
	if err != nil {
		return nil, fmt.Errorf("Get: %v", err)
	}

	fmt.Fprintln(w, "The HMAC key metadata is:")
	fmt.Fprintf(w, "%+v", key)
	return key, nil
}

Java

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

The following sample retrieves a list of HMAC keys associated with a project:

google-cloud-examples/src/main/java/com/google/cloud/examples/storage/snippets/StorageSnippets.java

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// Instantiate a Google Cloud Storage client
Storage storage = StorageOptions.getDefaultInstance().getService();

// The ID of the project to which the service account belongs.
// String projectId = "project-id";
Page<HmacKeyMetadata> page = storage.listHmacKeys(ListHmacKeysOption.projectId(projectId));

for (HmacKeyMetadata metadata : page.iterateAll()) {
  System.out.println("Service Account Email: " + metadata.getServiceAccount().getEmail());
  System.out.println("Access ID: " + metadata.getAccessId());
}

The following sample retrieves information for a specific HMAC key:

google-cloud-examples/src/main/java/com/google/cloud/examples/storage/snippets/StorageSnippets.java

View on GitHub Feedback

// Instantiate a Google Cloud Storage client
Storage storage = StorageOptions.getDefaultInstance().getService();

// The access ID of the HMAC key, e.g. "GOOG0234230X00"
// String accessId = "GOOG0234230X00";
//
// The ID of the project to which the service account belongs.
// String projectId = "project-id";
HmacKeyMetadata metadata =
    storage.getHmacKey(accessId, Storage.GetHmacKeyOption.projectId(projectId));

System.out.println("The HMAC key metadata is:");
System.out.println("ID: " + metadata.getId());
System.out.println("Access ID: " + metadata.getAccessId());
System.out.println("Project ID: " + metadata.getProjectId());
System.out.println("Service Account Email: " + metadata.getServiceAccount().getEmail());
System.out.println("State: " + metadata.getState().toString());
System.out.println("Time Created: " + new Date(metadata.getCreateTime()).toString());
System.out.println("Time Updated: " + new Date(metadata.getUpdateTime()).toString());
System.out.println("ETag: " + metadata.getEtag());

Node.js

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

The following sample retrieves a list of HMAC keys associated with a project:

samples/hmacKeysList.js

View on GitHub Feedback

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The ID of the project to which the service account belongs
// const projectId = 'project-id';

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

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

// List HMAC SA Keys' Metadata
async function listHmacKeys() {
  const [hmacKeys] = await storage.getHmacKeys({projectId});

  // hmacKeys is an array of HmacKey objects.
  for (const hmacKey of hmacKeys) {
    console.log(
      `Service Account Email: ${hmacKey.metadata.serviceAccountEmail}`
    );
    console.log(`Access Id: ${hmacKey.metadata.accessId}`);
  }
}

The following sample retrieves information for a specific HMAC key:

samples/hmacKeyGet.js

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/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The access ID of the HMAC key
// const hmacKeyAccessId = 'GOOG0234230X00';

// The ID of the project to which the service account belongs
// const projectId = 'project-id';

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

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

// Get HMAC SA Key Metadata
async function getHmacKey() {
  const hmacKey = storage.hmacKey(hmacKeyAccessId, {projectId});

  // Populate the hmacKey object with metadata from server.
  await hmacKey.getMetadata();

  console.log('The HMAC key metadata is:');
  for (const [key, value] of Object.entries(hmacKey.metadata)) {
    console.log(`${key}: ${value}`);
  }
}

PHP

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

The following sample retrieves a list of HMAC keys associated with a project:

storage/src/list_hmac_keys.php

View on GitHub Feedback

use Google\Cloud\Storage\StorageClient;

/**
 * List HMAC keys.
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 */
function list_hmac_keys($projectId)
{
    // $projectId = 'my-project-id';

    $storage = new StorageClient();
    // By default hmacKeys will use the projectId used by StorageClient() to list HMAC Keys.
    $hmacKeys = $storage->hmacKeys(['projectId' => $projectId]);

    printf('HMAC Key\'s:' . PHP_EOL);
    foreach ($hmacKeys as $hmacKey) {
        printf('Service Account Email: %s' . PHP_EOL, $hmacKey->info()['serviceAccountEmail']);
        printf('Access Id: %s' . PHP_EOL, $hmacKey->info()['accessId']);
    }
}

The following sample retrieves information for a specific HMAC key:

storage/src/get_hmac_key.php

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use Google\Cloud\Storage\StorageClient;

/**
 * Get an HMAC key.
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 * @param string $accessId Access ID for an HMAC key.
 */
function get_hmac_key($projectId, $accessId)
{
    // $projectId = 'my-project-id';
    // $accessId = 'GOOG0234230X00';

    $storage = new StorageClient();
    $hmacKey = $storage->hmacKey($accessId, $projectId);

    printf('HMAC key Metadata: %s' . PHP_EOL, print_r($hmacKey->info(), true));
}

Python

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

The following sample retrieves a list of HMAC keys associated with a project:

storage/cloud-client/storage_list_hmac_keys.py

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from google.cloud import storage


def list_keys(project_id):
    """
    List all HMAC keys associated with the project.
    """
    # project_id = "Your Google Cloud project ID"

    storage_client = storage.Client(project=project_id)
    hmac_keys = storage_client.list_hmac_keys(project_id=project_id)
    print("HMAC Keys:")
    for hmac_key in hmac_keys:
        print(
            "Service Account Email: {}".format(hmac_key.service_account_email)
        )
        print("Access ID: {}".format(hmac_key.access_id))
    return hmac_keys

The following sample retrieves information for a specific HMAC key:

storage/cloud-client/storage_get_hmac_key.py

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from google.cloud import storage


def get_key(access_id, project_id):
    """
    Retrieve the HMACKeyMetadata with the given access id.
    """
    # project_id = "Your Google Cloud project ID"
    # access_id = "ID of an HMAC key"

    storage_client = storage.Client(project=project_id)

    hmac_key = storage_client.get_hmac_key_metadata(
        access_id, project_id=project_id
    )

    print("The HMAC key metadata is:")
    print("Service Account Email: {}".format(hmac_key.service_account_email))
    print("Key ID: {}".format(hmac_key.id))
    print("Access ID: {}".format(hmac_key.access_id))
    print("Project ID: {}".format(hmac_key.project))
    print("State: {}".format(hmac_key.state))
    print("Created At: {}".format(hmac_key.time_created))
    print("Updated At: {}".format(hmac_key.updated))
    print("Etag: {}".format(hmac_key.etag))
    return hmac_key

Ruby

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

The following sample retrieves a list of HMAC keys associated with a project:

google-cloud-storage/samples/storage_list_hmac_keys.rb

View on GitHub Feedback

def list_hmac_keys
  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new

  # By default Storage#hmac_keys uses the Storage client project_id
  hmac_keys = storage.hmac_keys

  puts "HMAC Keys:"
  hmac_keys.all do |hmac_key|
    puts "Service Account Email: #{hmac_key.service_account_email}"
    puts "Access ID: #{hmac_key.access_id}"
  end
end

The following sample retrieves information for a specific HMAC key:

google-cloud-storage/samples/storage_get_hmac_key.rb

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def get_hmac_key access_id:
  # The access ID of the HMAC key
  # access_id = "GOOG0234230X00"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new

  # By default Storage#hmac_keys uses the Storage client project_id
  hmac_key = storage.hmac_key access_id

  puts "The HMAC key metadata is:"
  puts "Key ID:                #{hmac_key.id}"
  puts "Service Account Email: #{hmac_key.service_account_email}"
  puts "Access ID:             #{hmac_key.access_id}"
  puts "Project ID:            #{hmac_key.project_id}"
  puts "Active:                #{hmac_key.active?}"
  puts "Created At:            #{hmac_key.created_at}"
  puts "Updated At:            #{hmac_key.updated_at}"
  puts "Etag:                  #{hmac_key.etag}"
end

REST APIs

JSON API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

2. Use cURL to call the JSON API with a LIST hmacKeys request:

   curl -X GET \
     -H "Authorization: Bearer OAUTH2_TOKEN" \
     -H "Content-Type: application/json" \
     "https://storage.googleapis.com/storage/v1/projects/PROJECT_ID/hmacKeys"

   Where:

   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • PROJECT_ID is the ID for the project associated with the keys you want to list. For example, my-pet-project.

XML API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

2. Use cURL to call the XML API with a GET HMAC Key request:

   curl -X GET \
     -H "Authorization: Bearer OAUTH2_TOKEN" \
     "https://storage.googleapis.com/?Action=ListAccessKeys&UserName=SERVICE_ACCOUNT_EMAIL"

   Where:

   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • SERVICE_ACCOUNT_EMAIL is the email address associated with your service account. For example, [e-mail].

Updating the state of an HMAC key

To switch an HMAC key between being active and inactive:

Console

1. In the Google Cloud Console, go to the Cloud Storage Browser page.
   

   Go to Browser

2. Click Settings.

3. Select the Interoperability tab.

4. Click the name of the service account associated with the key you want to update.

5. Click the more actions menu () associated with the key you want to update.

6. Select the state you want to apply to the key.

7. In the confirmation window that appears, confirm you want to change the state of the key.

gsutil

Use the hmac update command:

gsutil hmac update -s STATE ACCESS_KEY_ID

Where:

• STATE is the desired state for the key. For example, INACTIVE.
• ACCESS_KEY_ID is the access ID associated with the key you are updating.

If successful, gsutil returns the updated metadata of the HMAC key.

Code samples

C++

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

The following sample deactivates an HMAC key:

google/cloud/storage/examples/storage_service_account_samples.cc

View on GitHub Feedback

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& access_id) {
  StatusOr<gcs::HmacKeyMetadata> updated = client.UpdateHmacKey(
      access_id, gcs::HmacKeyMetadata().set_state(
                     gcs::HmacKeyMetadata::state_inactive()));
  if (!updated) throw std::runtime_error(updated.status().message());

  if (updated->state() != gcs::HmacKeyMetadata::state_inactive()) {
    throw std::runtime_error("The HMAC key is active, this is unexpected");
  }
  std::cout << "The HMAC key is now inactive\nFull metadata: " << *updated
            << "\n";
}

The following sample activates an HMAC key:

google/cloud/storage/examples/storage_service_account_samples.cc

View on GitHub Feedback

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& access_id) {
  StatusOr<gcs::HmacKeyMetadata> updated = client.UpdateHmacKey(
      access_id,
      gcs::HmacKeyMetadata().set_state(gcs::HmacKeyMetadata::state_active()));
  if (!updated) throw std::runtime_error(updated.status().message());

  if (updated->state() != gcs::HmacKeyMetadata::state_active()) {
    throw std::runtime_error(
        "The HMAC key is NOT active, this is unexpected");
  }
  std::cout << "The HMAC key is now active\nFull metadata: " << *updated
            << "\n";
}

C#

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

The following sample deactivates an HMAC key:

storage/api/Storage.Samples/DeactivateHmacKey.cs

View on GitHub Feedback

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

public class DeactivateHmacKeySample
{
    public HmacKeyMetadata DeactivateHmacKey(
        string projectId = "your-project-id",
        string accessId = "your-access-id")
    {
        var storage = StorageClient.Create();
        var metadata = storage.GetHmacKey(projectId, accessId);
        metadata.State = HmacKeyStates.Inactive;
        var updatedMetadata = storage.UpdateHmacKey(metadata);

        Console.WriteLine("The HMAC key is now inactive.");
        Console.WriteLine("The HMAC key metadata is:");
        Console.WriteLine($"ID: {updatedMetadata.Id}");
        Console.WriteLine($"Access ID: {updatedMetadata.AccessId}");
        Console.WriteLine($"Project ID: {updatedMetadata.ProjectId}");
        Console.WriteLine($"Service Account Email: {updatedMetadata.ServiceAccountEmail}");
        Console.WriteLine($"State: {updatedMetadata.State}");
        Console.WriteLine($"Time Created: {updatedMetadata.TimeCreated}");
        Console.WriteLine($"Time Updated: {updatedMetadata.Updated}");
        Console.WriteLine($"ETag: {updatedMetadata.ETag}");
        return updatedMetadata;
    }
}

The following sample activates an HMAC key:

storage/api/Storage.Samples/ActivateHmacKey.cs

View on GitHub Feedback

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

public class ActivateHmacKeySample
{
    public HmacKeyMetadata ActivateHmacKey(
        string projectId = "your-project-id",
        string accessId = "access-id")
    {
        var storage = StorageClient.Create();
        var metadata = storage.GetHmacKey(projectId, accessId);
        metadata.State = HmacKeyStates.Active;
        var updatedMetadata = storage.UpdateHmacKey(metadata);

        Console.WriteLine("The HMAC key is now active.");
        Console.WriteLine("The HMAC key metadata is:");
        Console.WriteLine($"ID: {updatedMetadata.Id}");
        Console.WriteLine($"Access ID: {updatedMetadata.AccessId}");
        Console.WriteLine($"Project ID: {updatedMetadata.ProjectId}");
        Console.WriteLine($"Service Account Email: {updatedMetadata.ServiceAccountEmail}");
        Console.WriteLine($"State: {updatedMetadata.State}");
        Console.WriteLine($"Time Created: {updatedMetadata.TimeCreated}");
        Console.WriteLine($"Time Updated: {updatedMetadata.Updated}");
        Console.WriteLine($"ETag: {updatedMetadata.ETag}");
        return updatedMetadata;
    }
}

Go

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

The following sample deactivates an HMAC key:

storage/service_account/hmac/deactivate.go

View on GitHub Feedback

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

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

// deactivateHMACKey deactivates the HMAC key with the given access ID.
func deactivateHMACKey(w io.Writer, accessID string, projectID string) (*storage.HMACKey, error) {
	ctx := context.Background()

	// Initialize client.
	client, err := storage.NewClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("storage.NewClient: %v", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	ctx, cancel := context.WithTimeout(ctx, time.Minute)
	defer cancel()
	handle := client.HMACKeyHandle(projectID, accessID)
	key, err := handle.Update(ctx, storage.HMACKeyAttrsToUpdate{State: "INACTIVE"})
	if err != nil {
		return nil, fmt.Errorf("Update: %v", err)
	}

	fmt.Fprintln(w, "The HMAC key metadata is:")
	fmt.Fprintf(w, "%+v", key)

	return key, nil
}

The following sample activates an HMAC key:

storage/service_account/hmac/activate.go

View on GitHub Feedback

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

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

// activateHMACKey activates the HMAC key with the given access ID.
func activateHMACKey(w io.Writer, accessID string, projectID string) (*storage.HMACKey, error) {
	ctx := context.Background()

	// Initialize client.
	client, err := storage.NewClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("storage.NewClient: %v", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	handle := client.HMACKeyHandle(projectID, accessID)
	ctx, cancel := context.WithTimeout(ctx, time.Minute)
	defer cancel()
	key, err := handle.Update(ctx, storage.HMACKeyAttrsToUpdate{State: "ACTIVE"})
	if err != nil {
		return nil, fmt.Errorf("Update: %v", err)
	}

	fmt.Fprintln(w, "The HMAC key metadata is:")
	fmt.Fprintf(w, "%+v", key)

	return key, nil
}

Java

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

The following sample deactivates an HMAC key:

google-cloud-examples/src/main/java/com/google/cloud/examples/storage/snippets/StorageSnippets.java

View on GitHub Feedback

// Instantiate a Google Cloud Storage client
Storage storage = StorageOptions.getDefaultInstance().getService();

// The access ID of the HMAC key, e.g. "GOOG0234230X00"
// String accessId = "GOOG0234230X00";
//
// The ID of the project to which the service account belongs.
// String projectId = "project-id";
HmacKeyMetadata metadata =
    storage.getHmacKey(accessId, Storage.GetHmacKeyOption.projectId(projectId));
HmacKeyMetadata newMetadata = storage.updateHmacKeyState(metadata, HmacKeyState.INACTIVE);

System.out.println("The HMAC key is now inactive.");
System.out.println("The HMAC key metadata is:");
System.out.println("ID: " + newMetadata.getId());
System.out.println("Access ID: " + newMetadata.getAccessId());
System.out.println("Project ID: " + newMetadata.getProjectId());
System.out.println("Service Account Email: " + newMetadata.getServiceAccount().getEmail());
System.out.println("State: " + newMetadata.getState().toString());
System.out.println("Time Created: " + new Date(newMetadata.getCreateTime()).toString());
System.out.println("Time Updated: " + new Date(newMetadata.getUpdateTime()).toString());
System.out.println("ETag: " + newMetadata.getEtag());

The following sample activates an HMAC key:

google-cloud-examples/src/main/java/com/google/cloud/examples/storage/snippets/StorageSnippets.java

View on GitHub Feedback

// Instantiate a Google Cloud Storage client
Storage storage = StorageOptions.getDefaultInstance().getService();

// The access ID of the HMAC key, e.g. "GOOG0234230X00"
// String accessId = "GOOG0234230X00";
//
// The ID of the project to which the service account belongs.
// String projectId = "project-id";
HmacKeyMetadata metadata =
    storage.getHmacKey(accessId, Storage.GetHmacKeyOption.projectId(projectId));
HmacKeyMetadata newMetadata = storage.updateHmacKeyState(metadata, HmacKeyState.ACTIVE);

System.out.println("The HMAC key is now active.");
System.out.println("The HMAC key metadata is:");
System.out.println("ID: " + newMetadata.getId());
System.out.println("Access ID: " + newMetadata.getAccessId());
System.out.println("Project ID: " + newMetadata.getProjectId());
System.out.println("Service Account Email: " + newMetadata.getServiceAccount().getEmail());
System.out.println("State: " + newMetadata.getState().toString());
System.out.println("Time Created: " + new Date(newMetadata.getCreateTime()).toString());
System.out.println("Time Updated: " + new Date(newMetadata.getUpdateTime()).toString());
System.out.println("ETag: " + newMetadata.getEtag());

Node.js

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

The following sample deactivates an HMAC key:

samples/hmacKeyDeactivate.js

View on GitHub Feedback

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The access ID of the HMAC key
// const hmacKeyAccessId = 'GOOG0234230X00';

// The ID of the project to which the service account belongs
// const projectId = 'project-id';

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

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

// Deactivate HMAC SA Key
async function deactivateHmacKey() {
  const hmacKey = storage.hmacKey(hmacKeyAccessId, {projectId});
  const [hmacKeyMetadata] = await hmacKey.setMetadata({state: 'INACTIVE'});

  console.log('The HMAC key is now inactive.');
  console.log('The HMAC key metadata is:');
  for (const [key, value] of Object.entries(hmacKeyMetadata)) {
    console.log(`${key}: ${value}`);
  }
}

The following sample activates an HMAC key:

samples/hmacKeyActivate.js

View on GitHub Feedback

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The access ID of the HMAC key
// const hmacKeyAccessId = 'GOOG0234230X00';

// The ID of the project to which the service account belongs
// const projectId = 'project-id';

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

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

// Activate HMAC SA Key
async function activateHmacKey() {
  const hmacKey = storage.hmacKey(hmacKeyAccessId, {projectId});
  const [hmacKeyMetadata] = await hmacKey.setMetadata({state: 'ACTIVE'});

  console.log('The HMAC key is now active.');
  console.log('The HMAC key metadata is:');
  for (const [key, value] of Object.entries(hmacKeyMetadata)) {
    console.log(`${key}: ${value}`);
  }
}

PHP

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

The following sample deactivates an HMAC key:

storage/src/deactivate_hmac_key.php

View on GitHub Feedback

use Google\Cloud\Storage\StorageClient;

/**
 * Deactivate an HMAC key.
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 * @param string $accessId Access ID for an inactive HMAC key.
 */
function deactivate_hmac_key($projectId, $accessId)
{
    // $projectId = 'my-project-id';
    // $accessId = 'GOOG0234230X00';

    $storage = new StorageClient();
    // By default hmacKey will use the projectId used by StorageClient().
    $hmacKey = $storage->hmacKey($accessId, $projectId);

    $hmacKey->update('INACTIVE');

    print('The HMAC key is now inactive.' . PHP_EOL);
    printf('HMAC key Metadata: %s' . PHP_EOL, print_r($hmacKey->info(), true));
}

The following sample activates an HMAC key:

storage/src/activate_hmac_key.php

View on GitHub Feedback

use Google\Cloud\Storage\StorageClient;

/**
 * Activate an HMAC key.
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 * @param string $accessId Access ID for an inactive HMAC key.
 */
function activate_hmac_key($projectId, $accessId)
{
    // $projectId = 'my-project-id';
    // $accessId = 'GOOG0234230X00';

    $storage = new StorageClient();
    // By default hmacKey will use the projectId used by StorageClient().
    $hmacKey = $storage->hmacKey($accessId, $projectId);

    $hmacKey->update('ACTIVE');

    print('The HMAC key is now active.' . PHP_EOL);
    printf('HMAC key Metadata: %s' . PHP_EOL, print_r($hmacKey->info(), true));
}

Python

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

The following sample deactivates an HMAC key:

storage/cloud-client/storage_deactivate_hmac_key.py

View on GitHub Feedback

from google.cloud import storage


def deactivate_key(access_id, project_id):
    """
    Deactivate the HMAC key with the given access ID.
    """
    # project_id = "Your Google Cloud project ID"
    # access_id = "ID of an active HMAC key"

    storage_client = storage.Client(project=project_id)

    hmac_key = storage_client.get_hmac_key_metadata(
        access_id, project_id=project_id
    )
    hmac_key.state = "INACTIVE"
    hmac_key.update()

    print("The HMAC key is now inactive.")
    print("The HMAC key metadata is:")
    print("Service Account Email: {}".format(hmac_key.service_account_email))
    print("Key ID: {}".format(hmac_key.id))
    print("Access ID: {}".format(hmac_key.access_id))
    print("Project ID: {}".format(hmac_key.project))
    print("State: {}".format(hmac_key.state))
    print("Created At: {}".format(hmac_key.time_created))
    print("Updated At: {}".format(hmac_key.updated))
    print("Etag: {}".format(hmac_key.etag))
    return hmac_key

The following sample activates an HMAC key:

storage/cloud-client/storage_activate_hmac_key.py

View on GitHub Feedback

from google.cloud import storage


def activate_key(access_id, project_id):
    """
    Activate the HMAC key with the given access ID.
    """
    # project_id = "Your Google Cloud project ID"
    # access_id = "ID of an inactive HMAC key"

    storage_client = storage.Client(project=project_id)

    hmac_key = storage_client.get_hmac_key_metadata(
        access_id, project_id=project_id
    )
    hmac_key.state = "ACTIVE"
    hmac_key.update()

    print("The HMAC key metadata is:")
    print("Service Account Email: {}".format(hmac_key.service_account_email))
    print("Key ID: {}".format(hmac_key.id))
    print("Access ID: {}".format(hmac_key.access_id))
    print("Project ID: {}".format(hmac_key.project))
    print("State: {}".format(hmac_key.state))
    print("Created At: {}".format(hmac_key.time_created))
    print("Updated At: {}".format(hmac_key.updated))
    print("Etag: {}".format(hmac_key.etag))
    return hmac_key

Ruby

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

The following sample deactivates an HMAC key:

google-cloud-storage/samples/storage_deactivate_hmac_key.rb

View on GitHub Feedback

def deactivate_hmac_key access_id:
  # The access ID of the HMAC key
  # access_id = "GOOG0234230X00"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new

  # By default Storage#hmac_keys uses the Storage client project_id
  hmac_key = storage.hmac_key access_id

  hmac_key.inactive!

  puts "The HMAC key is now inactive."
  puts "The HMAC key metadata is:"
  puts "Key ID:                #{hmac_key.id}"
  puts "Service Account Email: #{hmac_key.service_account_email}"
  puts "Access ID:             #{hmac_key.access_id}"
  puts "Project ID:            #{hmac_key.project_id}"
  puts "Active:                #{hmac_key.active?}"
  puts "Created At:            #{hmac_key.created_at}"
  puts "Updated At:            #{hmac_key.updated_at}"
  puts "Etag:                  #{hmac_key.etag}"
end

The following sample activates an HMAC key:

google-cloud-storage/samples/storage_activate_hmac_key.rb

View on GitHub Feedback

def activate_hmac_key access_id:
  # The access ID of the HMAC key
  # access_id = "GOOG0234230X00"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new

  # By default Storage#hmac_keys uses the Storage client project_id
  hmac_key = storage.hmac_key access_id

  hmac_key.active!

  puts "The HMAC key is now active."
  puts "The HMAC key metadata is:"
  puts "Key ID:                #{hmac_key.id}"
  puts "Service Account Email: #{hmac_key.service_account_email}"
  puts "Access ID:             #{hmac_key.access_id}"
  puts "Project ID:            #{hmac_key.project_id}"
  puts "Active:                #{hmac_key.active?}"
  puts "Created At:            #{hmac_key.created_at}"
  puts "Updated At:            #{hmac_key.updated_at}"
  puts "Etag:                  #{hmac_key.etag}"
end

REST APIs

JSON API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

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

   {"state": "STATE"}

   Where STATE is the desired state for the key. For example, INACTIVE.

3. Use cURL to call the JSON API with a PUT hmacKeys request:

   curl -X PUT --data-binary @JSON_FILE_NAME.json \
     -H "Authorization: Bearer OAUTH2_TOKEN" \
     -H "Content-Type: application/json" \
     "https://storage.googleapis.com/storage/v1/projects/PROJECT_ID/hmacKeys/ACCESS_KEY_ID"

   Where:

   • JSON_FILE_NAME is the file you created in Step 2.
   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • PROJECT_ID is the ID for the project associated with the key you want to update. For example, my-pet-project.
   • ACCESS_KEY_ID is the access ID associated with the key you are updating.

XML API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

2. Use cURL to call the XML API with a POST HMAC Key request:

   curl -X POST \
       -H "Authorization: Bearer OAUTH2_TOKEN" \
       "https://storage.googleapis.com/?Action=UpdateAccessKey&AccessKeyId=ACCESS_KEY_ID&Status=STATUS"

   Where:

   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • ACCESS_KEY_ID is the access ID associated with the key you are updating.
   • STATUS is the desired status for the key. For example, Inactive.

When you change the state of an HMAC key, it takes up to 3 minutes for the state change to propagate through the Cloud Storage system. For this reason, you should wait at least 3 minutes between making an HMAC key inactive and deleting the key.

Deleting an HMAC key

Caution: HMAC keys cannot be recovered once you delete them. If you want to keep an HMAC key but prevent it from being used, set its state to INACTIVE.

An HMAC key must be in an inactive state in order to delete it. To delete an inactive HMAC key:

Console

1. In the Google Cloud Console, go to the Cloud Storage Browser page.
   

   Go to Browser

2. Click Settings.

3. Select the Interoperability tab.

4. Click the name of the service account associated with the key you want to update.

5. Click the more actions menu () associated with the key you want to update.

6. Select Delete from the drop-down menu.

7. In the text box that appears, enter the first 10 chracters of the access key ID as they are given in the window.

8. Click Delete.

gsutil

Use the hmac delete command:

gsutil hmac delete ACCESS_KEY_ID

Where ACCESS_KEY_ID is the access ID associated with the key you are deleting.

If successful, gsutil does not return a response.

Code samples

C++

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

View on GitHub Feedback

namespace gcs = google::cloud::storage;
[](gcs::Client client, std::string const& access_id) {
  google::cloud::Status status = client.DeleteHmacKey(access_id);
  if (!status.ok()) throw std::runtime_error(status.message());

  std::cout << "The key is deleted, though it may still appear"
            << " in ListHmacKeys() results.\n";
}

C#

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

View on GitHub Feedback

using Google.Cloud.Storage.V1;
using System;

public class DeleteHmacKeySample
{
    public void DeleteHmacKey(
        string projectId = "your-project-id",
        string accessId = "your-access-id")
    {
        var storage = StorageClient.Create();
        storage.DeleteHmacKey(projectId, accessId);

        Console.WriteLine($"Key {accessId} was deleted.");
    }
}

Go

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

View on GitHub Feedback

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

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

// deleteHMACKey deletes the HMAC key with the given access ID. Key must have state
// INACTIVE in order to succeed.
func deleteHMACKey(w io.Writer, accessID string, projectID string) error {
	ctx := context.Background()

	// Initialize client.
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %v", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	handle := client.HMACKeyHandle(projectID, accessID)
	ctx, cancel := context.WithTimeout(ctx, time.Minute)
	defer cancel()
	if err = handle.Delete(ctx); err != nil {
		return fmt.Errorf("Delete: %v", err)
	}

	fmt.Fprintln(w, "The key is deleted, though it may still appear in ListHMACKeys results.")

	return nil
}

Java

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

View on GitHub Feedback

// Instantiate a Google Cloud Storage client
Storage storage = StorageOptions.getDefaultInstance().getService();

// The access ID of the HMAC key, e.g. "GOOG0234230X00"
// String accessId = "GOOG0234230X00";
//
// The ID of the project to which the service account belongs.
// String projectId = "project-id";
HmacKeyMetadata metadata =
    storage.getHmacKey(accessId, Storage.GetHmacKeyOption.projectId(projectId));
storage.deleteHmacKey(metadata);

System.out.println(
    "The key is deleted, though it will still appear in getHmacKeys() results given showDeletedKey is true.");

Node.js

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

View on GitHub Feedback

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The access ID of the HMAC key
// const hmacKeyAccessId = 'GOOG0234230X00';

// The ID of the project to which the service account belongs
// const projectId = 'project-id';

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

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

// Delete HMAC SA Key
async function deleteHmacKey() {
  const hmacKey = storage.hmacKey(hmacKeyAccessId, {projectId});
  await hmacKey.delete();

  console.log(
    'The key is deleted, though it may still appear in getHmacKeys() results.'
  );
}

PHP

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

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use Google\Cloud\Storage\StorageClient;

/**
 * Delete an HMAC key.
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 * @param string $accessId Access ID for an HMAC key.
 */
function delete_hmac_key($projectId, $accessId)
{
    // $projectId = 'my-project-id';
    // $accessId = 'GOOG0234230X00';

    $storage = new StorageClient();
    // By default hmacKey will use the projectId used by StorageClient().
    $hmacKey = $storage->hmacKey($accessId, $projectId);

    $hmacKey->delete();
    print(
      'The key is deleted, though it may still appear in the results of calls ' .
      'to StorageClient.hmacKeys([\'showDeletedKeys\' => true])' . PHP_EOL
    );
}

Python

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

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from google.cloud import storage


def delete_key(access_id, project_id):
    """
    Delete the HMAC key with the given access ID. Key must have state INACTIVE
    in order to succeed.
    """
    # project_id = "Your Google Cloud project ID"
    # access_id = "ID of an HMAC key (must be in INACTIVE state)"

    storage_client = storage.Client(project=project_id)

    hmac_key = storage_client.get_hmac_key_metadata(
        access_id, project_id=project_id
    )
    hmac_key.delete()

    print(
        "The key is deleted, though it may still appear in list_hmac_keys()"
        " results."
    )

Ruby

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

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def delete_hmac_key access_id:
  # The access ID of the HMAC key
  # access_id = "GOOG0234230X00"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new

  # By default Storage#hmac_keys uses the Storage client project_id
  hmac_key = storage.hmac_key access_id

  hmac_key.delete!

  puts "The key is deleted, though it may still appear in Client#hmac_keys results."
end

REST APIs

JSON API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

2. Use cURL to call the JSON API with a DELETE hmacKeys request:

   curl -X DELETE \
     -H "Authorization: Bearer OAUTH2_TOKEN" \
     "https://storage.googleapis.com/storage/v1/projects/PROJECT_ID/hmacKeys/ACCESS_KEY_ID"

   Where:

   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • PROJECT_ID is the ID for the project associated with the key you want to delete. For example, my-pet-project.
   • ACCESS_KEY_ID is the access ID associated with the key you are deleting.

XML API

1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

2. Use cURL to call the XML API with a POST HMAC Key request:

   curl -X POST \
       -H "Authorization: Bearer OAUTH2_TOKEN" \
       "https://storage.googleapis.com/?Action=DeleteAccessKey&AccessKeyId=ACCESS_KEY_ID"

   Where:

   • OAUTH2_TOKEN is the access token you generated in Step 1.
   • ACCESS_KEY_ID is the access ID associated with the key you are deleting.

What's next

• Follow the guidelines for migrating from user account HMAC keys to service account HMAC keys.
• Use an HMAC key in an authenticated request.