Create a service account key

Demonstrates creating a service account key.

Explore further

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

• Create and delete service account keys

Code sample

C++

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM C++ API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

namespace iam = ::google::cloud::iam_admin_v1;
return [](std::string const& name) {
  iam::IAMClient client(iam::MakeIAMConnection());
  auto response = client.CreateServiceAccountKey(
      name,
      google::iam::admin::v1::ServiceAccountPrivateKeyType::
          TYPE_GOOGLE_CREDENTIALS_FILE,
      google::iam::admin::v1::ServiceAccountKeyAlgorithm::KEY_ALG_RSA_2048);
  if (!response) throw std::move(response).status();
  std::cout << "ServiceAccountKey successfully created: "
            << response->DebugString() << "\n"
            << "Please save the key in a secure location, as they cannot "
               "be downloaded later\n";
  return response->name();
}

C#

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM C# API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

using System;
using System.Text;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Iam.v1;
using Google.Apis.Iam.v1.Data;

public partial class ServiceAccountKeys
{
    public static ServiceAccountKey CreateKey(string serviceAccountEmail)
    {
        var credential = GoogleCredential.GetApplicationDefault()
            .CreateScoped(IamService.Scope.CloudPlatform);
        var service = new IamService(new IamService.Initializer
        {
            HttpClientInitializer = credential
        });

        var key = service.Projects.ServiceAccounts.Keys.Create(
            new CreateServiceAccountKeyRequest(),
            "projects/-/serviceAccounts/" + serviceAccountEmail)
            .Execute();

        // The PrivateKeyData field contains the base64-encoded service account key
        // in JSON format.
        // TODO(Developer): Save the below key (jsonKeyFile) to a secure location.
        //  You cannot download it later.
        byte[] valueBytes = System.Convert.FromBase64String(key.PrivateKeyData);
        string jsonKeyContent = Encoding.UTF8.GetString(valueBytes);

        Console.WriteLine("Key created successfully");
        return key;
    }
}

Go

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Go API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import (
	"context"
	// "encoding/base64"
	"fmt"
	"io"

	iam "google.golang.org/api/iam/v1"
)

// createKey creates a service account key.
func createKey(w io.Writer, serviceAccountEmail string) (*iam.ServiceAccountKey, error) {
	ctx := context.Background()
	service, err := iam.NewService(ctx)
	if err != nil {
		return nil, fmt.Errorf("iam.NewService: %w", err)
	}

	resource := "projects/-/serviceAccounts/" + serviceAccountEmail
	request := &iam.CreateServiceAccountKeyRequest{}
	key, err := service.Projects.ServiceAccounts.Keys.Create(resource, request).Do()
	if err != nil {
		return nil, fmt.Errorf("Projects.ServiceAccounts.Keys.Create: %w", err)
	}
	// The PrivateKeyData field contains the base64-encoded service account key
	// in JSON format.
	// TODO(Developer): Save the below key (jsonKeyFile) to a secure location.
	// You cannot download it later.
	// jsonKeyFile, _ := base64.StdEncoding.DecodeString(key.PrivateKeyData)
	fmt.Fprintf(w, "Key created successfully")
	return key, nil
}

Java

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Java API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import com.google.cloud.iam.admin.v1.IAMClient;
import com.google.gson.Gson;
import com.google.iam.admin.v1.CreateServiceAccountKeyRequest;
import com.google.iam.admin.v1.ServiceAccountKey;
import java.io.IOException;

public class CreateServiceAccountKey {

  public static void main(String[] args) throws IOException {
    // TODO(Developer): Replace the below variables before running.
    String projectId = "your-project-id";
    String serviceAccountName = "your-service-account-name";

    ServiceAccountKey key = createKey(projectId, serviceAccountName);
    Gson gson = new Gson();

    // System.out.println("Service account key: " + gson.toJson(key));
  }

  // Creates a key for a service account.
  public static ServiceAccountKey createKey(String projectId, String accountName)
          throws IOException {
    String email = String.format("%s@%s.iam.gserviceaccount.com", accountName, projectId);

    // Initialize client that will be used to send requests.
    // This client only needs to be created once, and can be reused for multiple requests.
    try (IAMClient iamClient = IAMClient.create()) {
      CreateServiceAccountKeyRequest req = CreateServiceAccountKeyRequest.newBuilder()
              .setName(String.format("projects/%s/serviceAccounts/%s", projectId, email))
              .build();
      ServiceAccountKey createdKey = iamClient.createServiceAccountKey(req);
      System.out.println("Key created successfully");

      return createdKey;
    }
  }
}

Python

To learn how to install and use the client library for IAM, see IAM client libraries. For more information, see the IAM Python API reference documentation.

To authenticate to IAM, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from google.cloud import iam_admin_v1
from google.cloud.iam_admin_v1 import types


def create_key(project_id: str, account: str) -> types.ServiceAccountKey:
    """
    Creates a key for a service account.

    project_id: ID or number of the Google Cloud project you want to use.
    account: ID or email which is unique identifier of the service account.
    """

    iam_admin_client = iam_admin_v1.IAMClient()
    request = types.CreateServiceAccountKeyRequest()
    request.name = f"projects/{project_id}/serviceAccounts/{account}"

    key = iam_admin_client.create_service_account_key(request=request)

    # The private_key_data field contains the stringified service account key
    # in JSON format. You cannot download it again later.
    # If you want to get the value, you can do it in a following way:
    # import json
    # json_key_data = json.loads(key.private_key_data)
    # key_id = json_key_data["private_key_id"]

    return key

What's next

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