This page describes how to find the email address of a project's
Cloud Storage service agent, which is a specialized service account created
and managed by Cloud Storage. For an overview of Cloud Storage
service agents, including when they're created and how they're used, see
[Service Accounts for Cloud Storage](https://docs.cloud.google.com/storage/docs/projects.md.txt#service-accounts). For a general overview of
service accounts in Google Cloud, see [Service Accounts](https://docs.cloud.google.com/iam/docs/service-accounts).

## Before you begin

In order to get the required permissions for finding the email address of a
project's service agent, ask your administrator to grant you the View Service
Accounts (`roles/iam.serviceAccountViewer`) role on the project.

This predefined role contains the `resourcemanager.projects.get` permission,
which is required to access the service agent of a project. You can also get
this permission with other [predefined roles](https://docs.cloud.google.com/iam/docs/understanding-roles). To see which roles are
associated with which permissions, refer to [IAM roles for
Cloud Storage](https://docs.cloud.google.com/storage/docs/access-control/iam-roles).

For instructions on using roles to control access to projects, see
[Manage access](https://docs.cloud.google.com/iam/docs/granting-changing-revoking-access.md.txt).

## Get the email address of a project's Cloud Storage service agent

### Console

1. In the Google Cloud console, go to the Cloud Storage **Settings** page.  

   [Go to Settings](https://console.cloud.google.com/storage/settings)
2. In the **Project Access** tab, the email address appears in the **Cloud
   Storage Service Account** section.

### Command line

Use the [`gcloud storage service-agent`](https://docs.cloud.google.com/sdk/gcloud/reference/storage/service-agent) command:

```
gcloud storage service-agent --project=PROJECT_IDENTIFIER
```

where `PROJECT_IDENTIFIER` is the ID or number of
the relevant project. For example, `my-project`.

### Client libraries


### C++


For more information, see the
[Cloud Storage C++ API
reference documentation](https://docs.cloud.google.com/cpp/docs/reference/storage/latest).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```c++
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client) {
  StatusOr<gcs::ServiceAccount> account = client.GetServiceAccount();
  if (!account) throw std::move(account).status();

  std::cout << "The service account details are " << *account << "\n";
}
```

### C#


For more information, see the
[Cloud Storage C# API
reference documentation](https://cloud.google.com/dotnet/docs/reference/Google.Cloud.Storage.V1/latest).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```c#

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

public class GetStorageServiceAccountSample
{
	public string GetStorageServiceAccount(string projectId = "your-project-id")
	{
		var storage = StorageClient.Create();

		var serviceAccountEmail = storage.GetStorageServiceAccountEmail(projectId);

		Console.WriteLine($"The GCS service account for project {projectId} is: {serviceAccountEmail}.");
		return serviceAccountEmail;
	}
}
```

### Go


For more information, see the
[Cloud Storage Go API
reference documentation](https://pkg.go.dev/cloud.google.com/go/storage).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```go
import (
	"context"
	"fmt"
	"io"
	"time"

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

// getServiceAccount gets the default Cloud Storage service account email address.
func getServiceAccount(w io.Writer, projectID string) error {
	// projectID := "my-project-id"

	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %w", err)
	}
	defer client.Close()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()

	serviceAccount, err := client.ServiceAccount(ctx, projectID)
	if err != nil {
		return fmt.Errorf("ServiceAccount: %w", err)
	}

	fmt.Fprintf(w, "The GCS service account for project %v is: %v\n", projectID, serviceAccount)
	return nil
}
```

### Java


For more information, see the
[Cloud Storage Java API
reference documentation](https://cloud.google.com/java/docs/reference/google-cloud-storage/latest/overview).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```java
import com.google.cloud.storage.ServiceAccount;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;

public class GetServiceAccount {
  public static void getServiceAccount(String projectId) {
    // The ID of your GCP project
    // String projectId = "your-project-id";

    Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();
    ServiceAccount serviceAccount = storage.getServiceAccount(projectId);
    System.out.println(
        "The GCS service account for project " + projectId + " is: " + serviceAccount.getEmail());
  }
}
```

### Node.js


For more information, see the
[Cloud Storage Node.js API
reference documentation](https://cloud.google.com/nodejs/docs/reference/storage/latest).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```javascript
/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The ID of your GCP project
// const projectId = 'your-project-id';

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

// Creates a client
const storage = new Storage({
  projectId,
});

async function getServiceAccount() {
  const [serviceAccount] = await storage.getServiceAccount();
  console.log(
    `The GCS service account for project ${projectId} is: ${serviceAccount.emailAddress}`
  );
}

getServiceAccount().catch(console.error);
```

### PHP


For more information, see the
[Cloud Storage PHP API
reference documentation](https://googleapis.github.io/google-cloud-php/#/docs/google-cloud/latest/storage/storageclient).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```php
use Google\Cloud\Storage\StorageClient;

/**
 * Get the current service account email.
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 *        (e.g. 'my-project-id')
 */
function get_service_account(string $projectId): void
{
    $storage = new StorageClient([
        'projectId' => $projectId,
    ]);

    $serviceAccountEmail = $storage->getServiceAccount();

    printf('The GCS service account email for project %s is %s', $projectId, $serviceAccountEmail);
}
```

### Python


For more information, see the
[Cloud Storage Python API
reference documentation](https://cloud.google.com/python/docs/reference/storage/latest).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```python
from google.cloud import storage


def get_service_account():
    """Get the service account email"""
    storage_client = storage.Client()

    email = storage_client.get_service_account_email()
    print(
        f"The GCS service account for project {storage_client.project} is: {email} "
    )

```

### Ruby


For more information, see the
[Cloud Storage Ruby API
reference documentation](https://googleapis.dev/ruby/google-cloud-storage/latest/Google/Cloud/Storage.html).


To authenticate to Cloud Storage, set up Application Default Credentials.
For more information, see

[Set up authentication for client libraries](https://docs.cloud.google.com/storage/docs/authentication.md.txt#client-libs).

```ruby
def get_service_account
  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new
  email = storage.service_account_email

  puts "The GCS service account for project #{storage.project_id} is: #{email}"
end
```

<br />

### JSON API

1. Have gcloud CLI [installed and initialized](https://docs.cloud.google.com/sdk/docs/install), which lets
   you generate an access token for the `Authorization` header.

2. Use [`cURL`](http://curl.haxx.se/) to call the JSON API with a [`GET` serviceAccount](https://docs.cloud.google.com/storage/docs/json_api/v1/projects/serviceAccount/get.md.txt)
   request:

   ```
   curl -X GET -H "Authorization: Bearer $(gcloud auth print-access-token)" \
   "https://storage.googleapis.com/storage/v1/projects/PROJECT_ID/serviceAccount"
   ```

   Where `PROJECT_ID` is the ID or number of the
   relevant project. For example, `my-project`.

## What's next

- Learn about [service accounts and service agents in Cloud Storage](https://docs.cloud.google.com/storage/docs/projects.md.txt#service-accounts).
- [Assign a Cloud Key Management Service encryption key](https://docs.cloud.google.com/storage/docs/encryption/using-customer-managed-keys.md.txt#service-agent-access) to a service agent.