Get an HMAC key

Get an HMAC key with its access ID.

Documentation pages that include this code sample

To view the code sample used in context, see the following documentation:

Code sample


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

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;


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

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";


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

import (


// 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


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

// 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());


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

 * 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}`);


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

use Google\Cloud\Storage\StorageClient;

 * Get an HMAC key.
 * @param string $accessId Access ID for an HMAC key.
 * @param string $projectId Google Cloud Project ID.
function get_hmac_key($accessId, $projectId)
    $storage = new StorageClient();
    $hmacKey = $storage->hmacKey($accessId, $projectId);

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


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

from 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(
    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


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

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

  require "google/cloud/storage"

  storage =

  # 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:                #{}"
  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:                #{}"
  puts "Created At:            #{hmac_key.created_at}"
  puts "Updated At:            #{hmac_key.updated_at}"
  puts "Etag:                  #{hmac_key.etag}"

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