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.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.iam.v1.Iam;
import com.google.api.services.iam.v1.IamScopes;
import com.google.api.services.iam.v1.model.CreateServiceAccountKeyRequest;
import com.google.api.services.iam.v1.model.ServiceAccountKey;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Base64;
import java.util.Collections;

public class CreateServiceAccountKey {

  // Creates a key for a service account.
  public static String createKey(String projectId, String serviceAccountName) {
    // String projectId = "my-project-id";
    // String serviceAccountName = "my-service-account-name";

    Iam service = null;
    try {
      service = initService();
    } catch (IOException | GeneralSecurityException e) {
      System.out.println("Unable to initialize service: \n" + e);
      return null;
    }

    // Construct the service account email.
    // You can modify the ".iam.gserviceaccount.com" to match the service account name in which
    // you want to create the key.
    // See, https://cloud.google.com/iam/docs/creating-managing-service-account-keys?hl=en#creating
    String serviceAccountEmail = serviceAccountName + "@" + projectId + ".iam.gserviceaccount.com";
    try {
      ServiceAccountKey key =
          service
              .projects()
              .serviceAccounts()
              .keys()
              .create(
                  "projects/-/serviceAccounts/" + serviceAccountEmail,
                  new CreateServiceAccountKeyRequest())
              .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.
      String jsonKeyFile = new String(Base64.getDecoder().decode(key.getPrivateKeyData()));

      System.out.println("Key created successfully");
      String keyName = key.getName();
      return keyName.substring(keyName.lastIndexOf("/") + 1).trim();
    } catch (IOException e) {
      System.out.println("Unable to create service account key: \n" + e);
      return null;
    }
  }

  private static Iam initService() throws GeneralSecurityException, IOException {
    // Use the Application Default Credentials strategy for authentication. For more info, see:
    // https://cloud.google.com/docs/authentication/production#finding_credentials_automatically
    GoogleCredentials credential =
        GoogleCredentials.getApplicationDefault()
            .createScoped(Collections.singleton(IamScopes.CLOUD_PLATFORM));
    // Initialize the IAM service, which can be used to send requests to the IAM API.
    Iam service =
        new Iam.Builder(
            GoogleNetHttpTransport.newTrustedTransport(),
            GsonFactory.getDefaultInstance(),
            new HttpCredentialsAdapter(credential))
            .setApplicationName("service-account-keys")
            .build();
    return service;
  }
}

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.

import os

from google.oauth2 import service_account
import googleapiclient.discovery  # type: ignore

def create_key(service_account_email: str) -> None:
    """Creates a key for a service account."""

    credentials = service_account.Credentials.from_service_account_file(
        filename=os.environ["GOOGLE_APPLICATION_CREDENTIALS"],
        scopes=["https://www.googleapis.com/auth/cloud-platform"],
    )

    service = googleapiclient.discovery.build("iam", "v1", credentials=credentials)

    key = (
        service.projects()
        .serviceAccounts()
        .keys()
        .create(name="projects/-/serviceAccounts/" + service_account_email, body={})
        .execute()
    )

    # The privateKeyData field contains the base64-encoded service account key
    # in JSON format.
    # TODO(Developer): Save the below key {json_key_file} to a secure location.
    #  You cannot download it again later.
    # import base64
    # json_key_file = base64.b64decode(key['privateKeyData']).decode('utf-8')

    if not key["disabled"]:
        print("Created json key")

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