List HMAC keys

List the HMAC keys in a project.

Explore further

For detailed documentation that includes this code sample, see the following:

• Manage HMAC keys for service accounts

Code sample

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) {
  int count = 0;
  gcs::ListHmacKeysReader hmac_keys_list = client.ListHmacKeys();
  for (auto& key : hmac_keys_list) {
    if (!key) throw std::move(key).status();

    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";
  }
}

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.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;
    }
}

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"
	"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: %w", 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: %w", 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
}

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.api.gax.paging.Page;
import com.google.cloud.storage.HmacKey;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageException;
import com.google.cloud.storage.StorageOptions;

public class ListHmacKeys {
  public static void listHmacKeys(String projectId) throws StorageException {
    // The ID of the project to which the service account belongs.
    // String projectId = "project-id";

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

    Page<HmacKey.HmacKeyMetadata> page =
        storage.listHmacKeys(Storage.ListHmacKeysOption.projectId(projectId));

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

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 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}`);
  }
}

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;

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

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 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(
            f"Service Account Email: {hmac_key.service_account_email}"
        )
        print(f"Access ID: {hmac_key.access_id}")
    return hmac_keys

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 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

What's next

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