Access control with IAM

This document describes the access control options available to you in Pub/Sub.

Overview

Pub/Sub uses Identity and Access Management (IAM) for access control.

In Pub/Sub, access control can be configured at the project level and at the individual resource level. For example:

• Grant access on a per-topic or per-subscription basis, rather than for the whole Cloud project.

  If you have view-only access to a single topic or subscription, you cannot view the topic or subscription using the Google Cloud console. Instead, you can use Google Cloud CLI.

• Grant access with limited capabilities, such as to only publish messages to a topic, or to only consume messages from a subscription, but not to delete the topic or subscription.

• Grant access to all Pub/Sub resources within a project to a group of developers.

For a detailed description of IAM and its features, see the IAM documentation. In particular, see Granting, changing, and revoking access to resources.

Every Pub/Sub method requires the necessary permissions. For a list of the permissions and roles that Pub/Sub IAM supports, see the Roles section, below.

Note: Pub/Sub is not associated with any specific IP address. This is relevant if you rely on IP-based firewall rules.

Permissions and roles

This section summarizes the permissions and roles that Pub/Sub IAM supports.

Required permissions

The following table lists the permissions required to call each method:

REST method	Required permission(s)
projects.snapshots.create	pubsub.snapshots.create on the containing Cloud project and pubsub.subscriptions.consume permission on the source subscription.
projects.snapshots.delete	pubsub.snapshots.delete on the requested snapshot.
projects.snapshots.getIamPolicy	pubsub.snapshots.getIamPolicy on the requested snapshot.
projects.snapshots.list	pubsub.snapshots.list on the requested Cloud project.
projects.snapshots.patch	pubsub.snapshots.update on the requested snapshot.
projects.snapshots.setIamPolicy	pubsub.snapshots.setIamPolicy on the requested snapshot.
projects.snapshots.testIamPermissions	None.
projects.subscriptions.acknowledge	pubsub.subscriptions.consume on the requested subscription.
projects.subscriptions.create	pubsub.subscriptions.create on the containing Cloud project and pubsub.topics.attachSubscription on the requested topic. Note that for creating a subscription in Project A to a Topic T in Project B, the appropriate permissions must be granted on both Project A and on Topic T. In this case, user identity info can be captured in Project B's audit logs.
projects.subscriptions.delete	pubsub.subscriptions.delete on the requested subscription.
projects.subscriptions.get	pubsub.subscriptions.get on the requested subscription.
projects.subscriptions.getIamPolicy	pubsub.subscriptions.getIamPolicy on the requested subscription.
projects.subscriptions.list	pubsub.subscriptions.list on the requested Cloud project.
projects.subscriptions.modifyAckDeadline	pubsub.subscriptions.consume on the requested subscription.
projects.subscriptions.modifyPushConfig	pubsub.subscriptions.update on the requested subscription.
projects.subscriptions.patch	pubsub.subscriptions.update on the requested subscription.
projects.subscriptions.pull	pubsub.subscriptions.consume on the requested subscription.
projects.subscriptions.seek	pubsub.subscriptions.consume on the requested subscription and pubsub.snapshots.seek on the requested snapshot, if any.
projects.subscriptions.setIamPolicy	pubsub.subscriptions.setIamPolicy on the requested subscription.
projects.subscriptions.testIamPermissions	None.
projects.topics.create	pubsub.topics.create on the containing Cloud project.
projects.topics.delete	pubsub.topics.delete on the requested topic.
projects.topics.detachSubscription	pubsub.topics.detachSubscription on the requested topic.
projects.topics.get	pubsub.topics.get on the requested topic.
projects.topics.getIamPolicy	pubsub.topics.getIamPolicy on the requested topic.
projects.topics.list	pubsub.topics.list on the requested Cloud project.
projects.topics.patch	pubsub.topics.update on the requested topic.
projects.topics.publish	pubsub.topics.publish on the requested topic.
projects.topics.setIamPolicy	pubsub.topics.setIamPolicy on the requested topic.
projects.topics.subscriptions.list	pubsub.topics.get on the requested topic.
projects.topics.testIamPermissions	None.

Roles

The following table lists all Pub/Sub roles and the permissions associated with each role:

Role	Permissions
Pub/Sub Admin (roles/pubsub.admin) Provides full access to topics and subscriptions. Lowest-level resources where you can grant this role: Schema Snapshot Subscription Topic	pubsub.* pubsub.schemas.attach pubsub.schemas.commit pubsub.schemas.create pubsub.schemas.delete pubsub.schemas.get pubsub.schemas.getIamPolicy pubsub.schemas.list pubsub.schemas.listRevisions pubsub.schemas.rollback pubsub.schemas.setIamPolicy pubsub.schemas.validate pubsub.snapshots.create pubsub.snapshots.delete pubsub.snapshots.get pubsub.snapshots.getIamPolicy pubsub.snapshots.list pubsub.snapshots.seek pubsub.snapshots.setIamPolicy pubsub.snapshots.update pubsub.subscriptions.consume pubsub.subscriptions.create pubsub.subscriptions.delete pubsub.subscriptions.get pubsub.subscriptions.getIamPolicy pubsub.subscriptions.list pubsub.subscriptions.setIamPolicy pubsub.subscriptions.update pubsub.topics.attachSubscription pubsub.topics.create pubsub.topics.delete pubsub.topics.detachSubscription pubsub.topics.get pubsub.topics.getIamPolicy pubsub.topics.list pubsub.topics.publish pubsub.topics.setIamPolicy pubsub.topics.update pubsub.topics.updateTag resourcemanager.projects.get serviceusage.quotas.get serviceusage.services.get serviceusage.services.list
Pub/Sub Editor (roles/pubsub.editor) Provides access to modify topics and subscriptions, and access to publish and consume messages. Lowest-level resources where you can grant this role: Schema Snapshot Subscription Topic	pubsub.schemas.attach pubsub.schemas.commit pubsub.schemas.create pubsub.schemas.delete pubsub.schemas.get pubsub.schemas.list pubsub.schemas.listRevisions pubsub.schemas.rollback pubsub.schemas.validate pubsub.snapshots.create pubsub.snapshots.delete pubsub.snapshots.get pubsub.snapshots.list pubsub.snapshots.seek pubsub.snapshots.update pubsub.subscriptions.consume pubsub.subscriptions.create pubsub.subscriptions.delete pubsub.subscriptions.get pubsub.subscriptions.list pubsub.subscriptions.update pubsub.topics.attachSubscription pubsub.topics.create pubsub.topics.delete pubsub.topics.detachSubscription pubsub.topics.get pubsub.topics.list pubsub.topics.publish pubsub.topics.update pubsub.topics.updateTag resourcemanager.projects.get serviceusage.quotas.get serviceusage.services.get serviceusage.services.list
Pub/Sub Publisher (roles/pubsub.publisher) Provides access to publish messages to a topic. Lowest-level resources where you can grant this role: Topic	pubsub.topics.publish
Pub/Sub Subscriber (roles/pubsub.subscriber) Provides access to consume messages from a subscription and to attach subscriptions to a topic. Lowest-level resources where you can grant this role: Snapshot Subscription Topic	pubsub.snapshots.seek pubsub.subscriptions.consume pubsub.topics.attachSubscription
Pub/Sub Viewer (roles/pubsub.viewer) Provides access to view topics and subscriptions. Lowest-level resources where you can grant this role: Schema Snapshot Subscription Topic	pubsub.schemas.get pubsub.schemas.list pubsub.schemas.listRevisions pubsub.schemas.validate pubsub.snapshots.get pubsub.snapshots.list pubsub.subscriptions.get pubsub.subscriptions.list pubsub.topics.get pubsub.topics.list resourcemanager.projects.get serviceusage.quotas.get serviceusage.services.get serviceusage.services.list

Controlling access through the Google Cloud console

You can use the Google Cloud console to manage access control for your topics and projects.

To set access controls at the project level, follow these steps:

1. In the Google Cloud console, go to the IAM page.

   Go to IAM

2. Select your project.

3. Click Add.

4. Type in one or more principal names.

5. In the Select a role list, select the role you want to grant.

6. Click Save.

7. Verify that the principal is listed with the role that you granted.

To set access controls for topics and subscriptions, follow these steps:

1. In the Google Cloud console, go to the Pub/Sub Topics list.

   Go to Topics

2. If needed, select your Pub/Sub-enabled project.

3. Perform one of the following steps:

   • To set roles for one or more topics, select the topics.

   • To set roles for a subscription attached to a topic, click the topic ID. In the Topic details page, click the subscription ID. The Subscription details page appears.

4. If the info panel is hidden, click Show info panel.

5. In the Permissions tab, click Add principal.

6. Type in one or more principal names.

7. In the Select a role list, select the role you want to grant.

8. Click Save.

Controlling access through the IAM API

The Pub/Sub IAM API lets you set and get policies on individual topics and subscriptions in a project, and test a user's permissions for a given resource. As with the regular Pub/Sub methods, you can invoke the IAM API methods through the client libraries, or the API Explorer, or directly over HTTP.

Note that you cannot use the Pub/Sub IAM API to manage policies at the Google Cloud project level.

The following sections give examples for how to set and get a policy, and how to test what permissions a caller has for a given resource.

Getting a policy

The getIamPolicy() method allows you to get an existing policy. This method returns a JSON object containing the policy associated with the resource.

Here is some sample code to get a policy for a subscription:

C#

Before trying this sample, follow the C# setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub C# API reference documentation.

using Google.Cloud.Iam.V1;
using Google.Cloud.PubSub.V1;

public class GetSubscriptionIamPolicySample
{
    public Policy GetSubscriptionIamPolicy(string projectId, string subscriptionId)
    {
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        SubscriptionName subscriptionName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId);
        Policy policy = publisher.IAMPolicyClient.GetIamPolicy(new GetIamPolicyRequest
        {
            ResourceAsResourceName = subscriptionName
        });
        return policy;
    }
}

gcloud

Get the subscription policy:

gcloud pubsub subscriptions get-iam-policy \
   projects/${PROJECT}/subscriptions/${SUBSCRIPTION} \
   --format json

Output:

   {
     "etag": "BwUjMhCsNvY=",
     "bindings": [
       {
         "role": "roles/pubsub.admin",
         "members": [
           "user:[e-mail]"
         ]
       },
       {
         "role": "roles/pubsub.editor",
         "members": [
           "serviceAccount:[e-mail]",
           "user:[e-mail]"
       }
     ]
   }

Go

Before trying this sample, follow the Go setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Go API reference documentation.

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/iam"
	"cloud.google.com/go/pubsub"
)

func policy(w io.Writer, projectID, subID string) (*iam.Policy, error) {
	// projectID := "my-project-id"
	// subID := "my-sub"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return nil, fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	policy, err := client.Subscription(subID).IAM().Policy(ctx)
	if err != nil {
		return nil, fmt.Errorf("Subscription: %w", err)
	}
	for _, role := range policy.Roles() {
		fmt.Fprintf(w, "%q: %q\n", role, policy.Members(role))
	}
	return policy, nil
}

Java

Before trying this sample, follow the Java setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Java API reference documentation.

import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.iam.v1.GetIamPolicyRequest;
import com.google.iam.v1.Policy;
import com.google.pubsub.v1.ProjectSubscriptionName;
import java.io.IOException;

public class GetSubscriptionPolicyExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String subscriptionId = "your-subscription-id";

    getSubscriptionPolicyExample(projectId, subscriptionId);
  }

  public static void getSubscriptionPolicyExample(String projectId, String subscriptionId)
      throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
      ProjectSubscriptionName subscriptionName =
          ProjectSubscriptionName.of(projectId, subscriptionId);
      GetIamPolicyRequest getIamPolicyRequest =
          GetIamPolicyRequest.newBuilder().setResource(subscriptionName.toString()).build();
      Policy policy = subscriptionAdminClient.getIamPolicy(getIamPolicyRequest);
      System.out.println("Subscription policy: " + policy);
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Node.js API reference documentation.

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function getSubscriptionPolicy(subscriptionNameOrId) {
  // Retrieves the IAM policy for the subscription
  const [policy] = await pubSubClient
    .subscription(subscriptionNameOrId)
    .iam.getPolicy();

  console.log(`Policy for subscription: ${JSON.stringify(policy.bindings)}.`);
}

Node.js

Before trying this sample, follow the Node.js setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Node.js API reference documentation.

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

// Imports the Google Cloud client library
import {PubSub, Policy} from '@google-cloud/pubsub';

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function getSubscriptionPolicy(subscriptionNameOrId: string) {
  // Retrieves the IAM policy for the subscription
  const [policy]: [Policy] = await pubSubClient
    .subscription(subscriptionNameOrId)
    .iam.getPolicy();

  console.log(`Policy for subscription: ${JSON.stringify(policy.bindings)}.`);
}

PHP

Before trying this sample, follow the PHP setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub PHP API reference documentation.

use Google\Cloud\PubSub\PubSubClient;

/**
 * Prints the policy for a PubSub subscription.
 *
 * @param string $projectId  The Google project ID.
 * @param string $subscriptionName  The Pub/Sub subscription name.
 */
function get_subscription_policy($projectId, $subscriptionName)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $subscription = $pubsub->subscription($subscriptionName);
    $policy = $subscription->iam()->policy();
    print_r($policy);
}

Python

Before trying this sample, follow the Python setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Python API reference documentation.

from google.cloud import pubsub_v1

# TODO(developer): Choose an existing subscription.
# project_id = "your-project-id"
# subscription_id = "your-subscription-id"

client = pubsub_v1.SubscriberClient()
subscription_path = client.subscription_path(project_id, subscription_id)

policy = client.get_iam_policy(request={"resource": subscription_path})

print("Policy for subscription {}:".format(subscription_path))
for binding in policy.bindings:
    print("Role: {}, Members: {}".format(binding.role, binding.members))

client.close()

Ruby

Before trying this sample, follow the Ruby setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Ruby API reference documentation.

# subscription_id = "your-subscription-id"

pubsub = Google::Cloud::Pubsub.new

subscription = pubsub.subscription subscription_id
policy       = subscription.policy

puts "Subscription policy:"
puts policy.roles

Here is some sample code to get a policy for a topic:

C#

Before trying this sample, follow the C# setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub C# API reference documentation.

using Google.Cloud.Iam.V1;
using Google.Cloud.PubSub.V1;

public class GetTopicIamPolicySample
{
    public Policy GetTopicIamPolicy(string projectId, string topicId)
    {
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        TopicName topicName = TopicName.FromProjectTopic(projectId, topicId);
        Policy policy = publisher.IAMPolicyClient.GetIamPolicy(new GetIamPolicyRequest
        {
            ResourceAsResourceName = topicName
        });
        return policy;
    }
}

gcloud

Get the topic policy

gcloud pubsub topics get-iam-policy \
    projects/${PROJECT}/topics/${TOPIC} \
    --format json

Output:

{
  "etag": "BwUjMhCsNvY=",
  "bindings": [
    {
      "role":" roles/pubsub.viewer",
      "members": [
        "user:[e-mail]"
      ]
    }
  ]
}

Go

Before trying this sample, follow the Go setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Go API reference documentation.

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/iam"
	"cloud.google.com/go/pubsub"
)

func policy(w io.Writer, projectID, topicID string) (*iam.Policy, error) {
	// projectID := "my-project-id"
	// topicID := "my-topic"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return nil, fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	policy, err := client.Topic(topicID).IAM().Policy(ctx)
	if err != nil {
		return nil, fmt.Errorf("Policy: %w", err)
	}
	for _, role := range policy.Roles() {
		fmt.Fprint(w, policy.Members(role))
	}
	return policy, nil
}

Java

Before trying this sample, follow the Java setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Java API reference documentation.

import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.iam.v1.GetIamPolicyRequest;
import com.google.iam.v1.Policy;
import com.google.pubsub.v1.TopicName;
import java.io.IOException;

public class GetTopicPolicyExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String topicId = "your-topic-id";

    getTopicPolicyExample(projectId, topicId);
  }

  public static void getTopicPolicyExample(String projectId, String topicId) throws IOException {
    try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
      TopicName topicName = TopicName.of(projectId, topicId);
      GetIamPolicyRequest getIamPolicyRequest =
          GetIamPolicyRequest.newBuilder().setResource(topicName.toString()).build();
      Policy policy = topicAdminClient.getIamPolicy(getIamPolicyRequest);
      System.out.println("Topic policy: " + policy);
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Node.js API reference documentation.

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function getTopicPolicy(topicNameOrId) {
  // Retrieves the IAM policy for the topic
  const [policy] = await pubSubClient.topic(topicNameOrId).iam.getPolicy();
  console.log('Policy for topic: %j.', policy.bindings);
}

PHP

Before trying this sample, follow the PHP setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub PHP API reference documentation.

use Google\Cloud\PubSub\PubSubClient;

/**
 * Prints the policy for a Pub/Sub topic.
 *
 * @param string $projectId  The Google project ID.
 * @param string $topicName  The Pub/Sub topic name.
 */
function get_topic_policy($projectId, $topicName)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $topic = $pubsub->topic($topicName);
    $policy = $topic->iam()->policy();
    print_r($policy);
}

Python

Before trying this sample, follow the Python setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Python API reference documentation.

from google.cloud import pubsub_v1

# TODO(developer): Choose an existing topic.
# project_id = "your-project-id"
# topic_id = "your-topic-id"

client = pubsub_v1.PublisherClient()
topic_path = client.topic_path(project_id, topic_id)

policy = client.get_iam_policy(request={"resource": topic_path})

print("Policy for topic {}:".format(topic_path))
for binding in policy.bindings:
    print("Role: {}, Members: {}".format(binding.role, binding.members))

Ruby

Before trying this sample, follow the Ruby setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Ruby API reference documentation.

# topic_id = "your-topic-id"

pubsub = Google::Cloud::Pubsub.new

topic  = pubsub.topic topic_id
policy = topic.policy

puts "Topic policy:"
puts policy.roles

Setting a policy

The setIamPolicy() method lets you attach a policy to a resource. The setIamPolicy() method takes a SetIamPolicyRequest, which contains the policy to be set and the resource to which the policy is attached. It returns the resulting policy.

Here is some sample code to set a policy for a subscription:

C#

Before trying this sample, follow the C# setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub C# API reference documentation.

using Google.Cloud.Iam.V1;
using Google.Cloud.PubSub.V1;

public class SetSubscriptionIamPolicySample
{
    public Policy SetSubscriptionIamPolicy(string projectId, string subscriptionId, string role, string member)
    {
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        string roleToBeAddedToPolicy = $"roles/{role}";

        Policy policy = new Policy
        {
            Bindings = {
                new Binding
                {
                    Role = roleToBeAddedToPolicy,
                    Members = { member }
                }
            }
        };
        SetIamPolicyRequest request = new SetIamPolicyRequest
        {
            ResourceAsResourceName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId),
            Policy = policy
        };
        Policy response = publisher.IAMPolicyClient.SetIamPolicy(request);
        return response;
    }
}

gcloud

1. Save the policy for the subscription.

gcloud pubsub subscriptions get-iam-policy \
   projects/${PROJECT}/subscriptions/${SUBSCRIPTION} \
   --format json > subscription_policy.json

2. Open subscription_policy.json and update bindings by giving appropriate roles to appropriate principals. For more information about working with subscription_policy.json files, see Policy in the IAM documentation.

   {
     "etag": "BwUjMhCsNvY=",
     "bindings": [
       {
         "role": "roles/pubsub.admin",
         "members": [
           "user:[e-mail]"
         ]
       },
       {
         "role": "roles/pubsub.editor",
         "members": [
           "serviceAccount:[e-mail]"
       }
     ]
   }

3. Apply the new subscription policy.

gcloud pubsub subscriptions set-iam-policy \
  projects/${PROJECT}/subscriptions/${SUBSCRIPTION} \
  subscription_policy.json

Go

Before trying this sample, follow the Go setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Go API reference documentation.

import (
	"context"
	"fmt"

	"cloud.google.com/go/iam"
	"cloud.google.com/go/pubsub"
)

// addUsers adds all IAM users to a subscription.
func addUsers(projectID, subID string) error {
	// projectID := "my-project-id"
	// subID := "my-sub"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	sub := client.Subscription(subID)
	policy, err := sub.IAM().Policy(ctx)
	if err != nil {
		return fmt.Errorf("err getting IAM Policy: %w", err)
	}
	// Other valid prefixes are "serviceAccount:", "user:"
	// See the documentation for more values.
	policy.Add(iam.AllUsers, iam.Viewer)
	policy.Add("group:[e-mail]", iam.Editor)
	if err := sub.IAM().SetPolicy(ctx, policy); err != nil {
		return fmt.Errorf("SetPolicy: %w", err)
	}
	// NOTE: It may be necessary to retry this operation if IAM policies are
	// being modified concurrently. SetPolicy will return an error if the policy
	// was modified since it was retrieved.
	return nil
}

Java

Before trying this sample, follow the Java setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Java API reference documentation.

import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.iam.v1.Binding;
import com.google.iam.v1.GetIamPolicyRequest;
import com.google.iam.v1.Policy;
import com.google.iam.v1.SetIamPolicyRequest;
import com.google.pubsub.v1.ProjectSubscriptionName;
import java.io.IOException;

public class SetSubscriptionPolicyExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String subscriptionId = "your-subscription-id";

    setSubscriptionPolicyExample(projectId, subscriptionId);
  }

  public static void setSubscriptionPolicyExample(String projectId, String subscriptionId)
      throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
      ProjectSubscriptionName subscriptionName =
          ProjectSubscriptionName.of(projectId, subscriptionId);
      GetIamPolicyRequest getIamPolicyRequest =
          GetIamPolicyRequest.newBuilder().setResource(subscriptionName.toString()).build();
      Policy oldPolicy = subscriptionAdminClient.getIamPolicy(getIamPolicyRequest);

      // Create new role -> members binding
      Binding binding =
          Binding.newBuilder()
              .setRole("roles/pubsub.editor")
              .addMembers("domain:google.com")
              .build();

      // Add new binding to updated policy
      Policy updatedPolicy = Policy.newBuilder(oldPolicy).addBindings(binding).build();

      SetIamPolicyRequest setIamPolicyRequest =
          SetIamPolicyRequest.newBuilder()
              .setResource(subscriptionName.toString())
              .setPolicy(updatedPolicy)
              .build();
      Policy newPolicy = subscriptionAdminClient.setIamPolicy(setIamPolicyRequest);
      System.out.println("New subscription policy: " + newPolicy);
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Node.js API reference documentation.

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function setSubscriptionPolicy(subscriptionNameOrId) {
  // The new IAM policy
  const newPolicy = {
    bindings: [
      {
        // Add a group as editors
        role: 'roles/pubsub.editor',
        members: ['group:[e-mail]'],
      },
      {
        // Add all users as viewers
        role: 'roles/pubsub.viewer',
        members: ['allUsers'],
      },
    ],
  };

  // Updates the IAM policy for the subscription
  const [updatedPolicy] = await pubSubClient
    .subscription(subscriptionNameOrId)
    .iam.setPolicy(newPolicy);

  console.log('Updated policy for subscription: %j', updatedPolicy.bindings);
}

PHP

use Google\Cloud\PubSub\PubSubClient;

/**
 * Adds a user to the policy for a Pub/Sub subscription.
 *
 * @param string $projectId  The Google project ID.
 * @param string $subscriptionName  The Pub/Sub subscription name.
 * @param string $userEmail  The user email to add to the policy.
 */
function set_subscription_policy($projectId, $subscriptionName, $userEmail)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $subscription = $pubsub->subscription($subscriptionName);
    $policy = $subscription->iam()->policy();
    $policy['bindings'][] = [
        'role' => 'roles/pubsub.subscriber',
        'members' => ['user:' . $userEmail]
    ];
    $subscription->iam()->setPolicy($policy);

    printf(
        'User %s added to policy for %s' . PHP_EOL,
        $userEmail,
        $subscriptionName
    );
}

Python

Before trying this sample, follow the Python setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Python API reference documentation.

from google.cloud import pubsub_v1

# TODO(developer): Choose an existing subscription.
# project_id = "your-project-id"
# subscription_id = "your-subscription-id"

client = pubsub_v1.SubscriberClient()
subscription_path = client.subscription_path(project_id, subscription_id)

policy = client.get_iam_policy(request={"resource": subscription_path})

# Add all users as viewers.
policy.bindings.add(role="roles/pubsub.viewer", members=["domain:google.com"])

# Add a group as an editor.
policy.bindings.add(role="roles/editor", members=["group:[e-mail]"])

# Set the policy
policy = client.set_iam_policy(
    request={"resource": subscription_path, "policy": policy}
)

print("IAM policy for subscription {} set: {}".format(subscription_id, policy))

client.close()

Ruby

Before trying this sample, follow the Ruby setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Ruby API reference documentation.

# subscription_id       = "your-subscription-id"
# role                  = "roles/pubsub.publisher"
# service_account_email = "serviceAccount:account_name@project_name.iam.gserviceaccount.com"

pubsub = Google::Cloud::Pubsub.new

subscription = pubsub.subscription subscription_id
subscription.policy do |policy|
  policy.add role, service_account_email
end

Here is some sample code to set a policy for a topic:

C#

Before trying this sample, follow the C# setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub C# API reference documentation.

using Google.Cloud.Iam.V1;
using Google.Cloud.PubSub.V1;

public class SetTopicIamPolicySample
{
    public Policy SetTopicIamPolicy(string projectId, string topicId, string role, string member)
    {
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        string roleToBeAddedToPolicy = $"roles/{role}";

        Policy policy = new Policy
        {
            Bindings = {
                new Binding
                {
                    Role = roleToBeAddedToPolicy,
                    Members = { member }
                }
            }
        };
        SetIamPolicyRequest request = new SetIamPolicyRequest
        {
            ResourceAsResourceName = TopicName.FromProjectTopic(projectId, topicId),
            Policy = policy
        };
        Policy response = publisher.IAMPolicyClient.SetIamPolicy(request);
        return response;
    }
}

gcloud

1. Save the policy for the topic.

gcloud pubsub topics get-iam-policy \
   projects/${PROJECT}/topics/${TOPIC} \
   --format json > topic_policy.json

2. Open topic_policy.json and update bindings by giving appropriate roles to appropriate principals. For more information about working with subscription_policy.json files, see Policy in the IAM documentation.

   {
     "etag": "BwUjMhCsNvY=",
     "bindings": [
       {
         "role": "roles/pubsub.editor",
         "members": [
           "user:[e-mail]",
           "user:[e-mail]"
         ]
       }
     ]
   }

3. Apply the new topic policy.

gcloud pubsub topics set-iam-policy  \
   projects/${PROJECT}/topics/${TOPIC}     \
   topic_policy.json

Go

Before trying this sample, follow the Go setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Go API reference documentation.

import (
	"context"
	"fmt"

	"cloud.google.com/go/iam"
	"cloud.google.com/go/pubsub"
)

func addUsers(projectID, topicID string) error {
	// projectID := "my-project-id"
	// topicID := "my-topic"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	topic := client.Topic(topicID)
	policy, err := topic.IAM().Policy(ctx)
	if err != nil {
		return fmt.Errorf("Policy: %w", err)
	}
	// Other valid prefixes are "serviceAccount:", "user:"
	// See the documentation for more values.
	policy.Add(iam.AllUsers, iam.Viewer)
	policy.Add("group:[e-mail]", iam.Editor)
	if err := topic.IAM().SetPolicy(ctx, policy); err != nil {
		return fmt.Errorf("SetPolicy: %w", err)
	}
	// NOTE: It may be necessary to retry this operation if IAM policies are
	// being modified concurrently. SetPolicy will return an error if the policy
	// was modified since it was retrieved.
	return nil
}

Java

Before trying this sample, follow the Java setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Java API reference documentation.

import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.iam.v1.Binding;
import com.google.iam.v1.GetIamPolicyRequest;
import com.google.iam.v1.Policy;
import com.google.iam.v1.SetIamPolicyRequest;
import com.google.pubsub.v1.TopicName;
import java.io.IOException;

public class SetTopicPolicyExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String topicId = "your-topic-id";

    setTopicPolicyExample(projectId, topicId);
  }

  public static void setTopicPolicyExample(String projectId, String topicId) throws IOException {
    try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
      TopicName topicName = TopicName.of(projectId, topicId);
      GetIamPolicyRequest getIamPolicyRequest =
          GetIamPolicyRequest.newBuilder().setResource(topicName.toString()).build();
      Policy oldPolicy = topicAdminClient.getIamPolicy(getIamPolicyRequest);

      // Create new role -> members binding
      Binding binding =
          Binding.newBuilder()
              .setRole("roles/pubsub.editor")
              .addMembers("domain:google.com")
              .build();

      // Add new binding to updated policy
      Policy updatedPolicy = Policy.newBuilder(oldPolicy).addBindings(binding).build();

      SetIamPolicyRequest setIamPolicyRequest =
          SetIamPolicyRequest.newBuilder()
              .setResource(topicName.toString())
              .setPolicy(updatedPolicy)
              .build();
      Policy newPolicy = topicAdminClient.setIamPolicy(setIamPolicyRequest);
      System.out.println("New topic policy: " + newPolicy);
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Node.js API reference documentation.

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function setTopicPolicy(topicNameOrId) {
  // The new IAM policy
  const newPolicy = {
    bindings: [
      {
        // Add a group as editors
        role: 'roles/pubsub.editor',
        members: ['group:[e-mail]'],
      },
      {
        // Add all users as viewers
        role: 'roles/pubsub.viewer',
        members: ['allUsers'],
      },
    ],
  };

  // Updates the IAM policy for the topic
  const [updatedPolicy] = await pubSubClient
    .topic(topicNameOrId)
    .iam.setPolicy(newPolicy);
  console.log('Updated policy for topic: %j', updatedPolicy.bindings);
}

PHP

use Google\Cloud\PubSub\PubSubClient;

/**
 * Adds a user to the policy for a Pub/Sub topic.
 *
 * @param string $projectId  The Google project ID.
 * @param string $topicName  The Pub/Sub topic name.
 * @param string $userEmail  The user email to add to the policy.
 */
function set_topic_policy($projectId, $topicName, $userEmail)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $topic = $pubsub->topic($topicName);
    $policy = $topic->iam()->policy();
    $policy['bindings'][] = [
        'role' => 'roles/pubsub.publisher',
        'members' => ['user:' . $userEmail]
    ];
    $topic->iam()->setPolicy($policy);

    printf(
        'User %s added to policy for %s' . PHP_EOL,
        $userEmail,
        $topicName
    );
}

Python

Before trying this sample, follow the Python setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Python API reference documentation.

from google.cloud import pubsub_v1

# TODO(developer): Choose an existing topic.
# project_id = "your-project-id"
# topic_id = "your-topic-id"

client = pubsub_v1.PublisherClient()
topic_path = client.topic_path(project_id, topic_id)

policy = client.get_iam_policy(request={"resource": topic_path})

# Add all users as viewers.
policy.bindings.add(role="roles/pubsub.viewer", members=["domain:google.com"])

# Add a group as a publisher.
policy.bindings.add(
    role="roles/pubsub.publisher", members=["group:[e-mail]"]
)

# Set the policy
policy = client.set_iam_policy(request={"resource": topic_path, "policy": policy})

print("IAM policy for topic {} set: {}".format(topic_id, policy))

Ruby

Before trying this sample, follow the Ruby setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Ruby API reference documentation.

# topic_id              = "your-topic-id"
# role                  = "roles/pubsub.publisher"
# service_account_email = "serviceAccount:account_name@project_name.iam.gserviceaccount.com"

pubsub = Google::Cloud::Pubsub.new

topic = pubsub.topic topic_id
topic.policy do |policy|
  policy.add role, service_account_email
end

Testing permissions

You can use the testIamPermissions() method to check which of the given permissions can be added or removed for the given resource. It takes as parameters a resource name and a set of permissions, and returns the subset of permissions.

Note: The testIamPermissions is designed to test permission-aware UIs and command-line tools, not authorization. This operation might fail open without warning.

Here is some sample code to test permissions for a subscription:

C#

Before trying this sample, follow the C# setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub C# API reference documentation.

using Google.Cloud.Iam.V1;
using Google.Cloud.PubSub.V1;

public class TestSubscriptionIamPermissionsSample
{
    public TestIamPermissionsResponse TestSubscriptionIamPermissionsResponse(string projectId, string subscriptionId)
    {
        TestIamPermissionsRequest request = new TestIamPermissionsRequest
        {
            ResourceAsResourceName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId),
            Permissions = { "pubsub.subscriptions.get", "pubsub.subscriptions.update" }
        };
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        TestIamPermissionsResponse response = publisher.IAMPolicyClient.TestIamPermissions(request);
        return response;
    }
}

gcloud

gcloud iam list-testable-permissions \
   https://pubsub.googleapis.com/v1/projects/${PROJECT}/subscriptions/${SUBSCRIPTION} \
   --format json

Output:

 [
    {
     "name": "pubsub.subscriptions.consume",
     "stage": "GA"
   },
   {
     "name": "pubsub.subscriptions.delete",
     "stage": "GA"
   },
   {
     "name": "pubsub.subscriptions.get",
     "stage": "GA"
   },
   {
     "name": "pubsub.subscriptions.getIamPolicy",
     "stage": "GA"
    },
   {
     "name": "pubsub.subscriptions.setIamPolicy",
     "stage": "GA"
   },
   {
     "name": "pubsub.subscriptions.update",
     "stage": "GA"
   }
 ]

Go

Before trying this sample, follow the Go setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Go API reference documentation.

import (
	"context"
	"fmt"
	"io"

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

func testPermissions(w io.Writer, projectID, subID string) ([]string, error) {
	// projectID := "my-project-id"
	// subID := "my-sub"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return nil, fmt.Errorf("pubsub.NewClient: %w", err)
	}

	sub := client.Subscription(subID)
	perms, err := sub.IAM().TestPermissions(ctx, []string{
		"pubsub.subscriptions.consume",
		"pubsub.subscriptions.update",
	})
	if err != nil {
		return nil, fmt.Errorf("TestPermissions: %w", err)
	}
	for _, perm := range perms {
		fmt.Fprintf(w, "Allowed: %v\n", perm)
	}

Java

Before trying this sample, follow the Java setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Java API reference documentation.

import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.iam.v1.TestIamPermissionsRequest;
import com.google.iam.v1.TestIamPermissionsResponse;
import com.google.pubsub.v1.ProjectSubscriptionName;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

public class TestSubscriptionPermissionsExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String subscriptionId = "your-subscription-id";

    testSubscriptionPermissionsExample(projectId, subscriptionId);
  }

  public static void testSubscriptionPermissionsExample(String projectId, String subscriptionId)
      throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
      ProjectSubscriptionName subscriptionName =
          ProjectSubscriptionName.of(projectId, subscriptionId);

      List<String> permissions = new LinkedList<>();
      permissions.add("pubsub.subscriptions.consume");
      permissions.add("pubsub.subscriptions.update");

      TestIamPermissionsRequest testIamPermissionsRequest =
          TestIamPermissionsRequest.newBuilder()
              .setResource(subscriptionName.toString())
              .addAllPermissions(permissions)
              .build();

      TestIamPermissionsResponse testedPermissionsResponse =
          subscriptionAdminClient.testIamPermissions(testIamPermissionsRequest);

      System.out.println("Tested:\n" + testedPermissionsResponse);
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Node.js API reference documentation.

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function testSubscriptionPermissions(subscriptionNameOrId) {
  const permissionsToTest = [
    'pubsub.subscriptions.consume',
    'pubsub.subscriptions.update',
  ];

  // Tests the IAM policy for the specified subscription
  const [permissions] = await pubSubClient
    .subscription(subscriptionNameOrId)
    .iam.testPermissions(permissionsToTest);

  console.log('Tested permissions for subscription: %j', permissions);
}

PHP

Before trying this sample, follow the PHP setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub PHP API reference documentation.

use Google\Cloud\PubSub\PubSubClient;

/**
 * Prints the permissions of a subscription.
 *
 * @param string $projectId  The Google project ID.
 * @param string $subscriptionName  The Pub/Sub subscription name.
 */
function test_subscription_permissions($projectId, $subscriptionName)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $subscription = $pubsub->subscription($subscriptionName);
    $permissions = $subscription->iam()->testPermissions([
        'pubsub.subscriptions.consume',
        'pubsub.subscriptions.update'
    ]);
    foreach ($permissions as $permission) {
        printf('Permission: %s' . PHP_EOL, $permission);
    }
}

Python

Before trying this sample, follow the Python setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Python API reference documentation.

from google.cloud import pubsub_v1

# TODO(developer): Choose an existing subscription.
# project_id = "your-project-id"
# subscription_id = "your-subscription-id"

client = pubsub_v1.SubscriberClient()
subscription_path = client.subscription_path(project_id, subscription_id)

permissions_to_check = [
    "pubsub.subscriptions.consume",
    "pubsub.subscriptions.update",
]

allowed_permissions = client.test_iam_permissions(
    request={"resource": subscription_path, "permissions": permissions_to_check}
)

print(
    "Allowed permissions for subscription {}: {}".format(
        subscription_path, allowed_permissions
    )
)

client.close()

Ruby

Before trying this sample, follow the Ruby setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Ruby API reference documentation.

# subscription_id = "your-subscription-id"

pubsub = Google::Cloud::Pubsub.new

subscription = pubsub.subscription subscription_id
permissions  = subscription.test_permissions "pubsub.subscriptions.consume",
                                             "pubsub.subscriptions.update"

puts "Permission to consume" if permissions.include? "pubsub.subscriptions.consume"
puts "Permission to update" if permissions.include? "pubsub.subscriptions.update"

Here is some sample code to test permissions for a topic:

C#

Before trying this sample, follow the C# setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub C# API reference documentation.

using Google.Cloud.Iam.V1;
using Google.Cloud.PubSub.V1;

public class TestTopicIamPermissionsSample
{
    public TestIamPermissionsResponse TestTopicIamPermissions(string projectId, string topicId)
    {
        TestIamPermissionsRequest request = new TestIamPermissionsRequest
        {
            ResourceAsResourceName = TopicName.FromProjectTopic(projectId, topicId),
            Permissions = { "pubsub.topics.get", "pubsub.topics.update" }
        };
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        TestIamPermissionsResponse response = publisher.IAMPolicyClient.TestIamPermissions(request);
        return response;
    }
}

gcloud

gcloud iam list-testable-permissions \
   https://pubsub.googleapis.com/v1/projects/${PROJECT}/topics/${TOPIC} \
   --format json

Output

 [
   {
     "name": "pubsub.topics.attachSubscription",
     "stage": "GA"
   },
   {
     "name": "pubsub.topics.delete",
     "stage": "GA"
   },
   {
     "name": "pubsub.topics.detachSubscription",
     "stage": "GA"
   },
   {
     "name": "pubsub.topics.get",
     "stage": "GA"
   },
   {
     "name": "pubsub.topics.getIamPolicy",
     "stage": "GA"
   },
   {
     "name": "pubsub.topics.publish",
     "stage": "GA"
   },
   {
     "name": "pubsub.topics.setIamPolicy",
     "stage": "GA"
   },
   {
     "name": "pubsub.topics.update",
     "stage": "GA"
   }
 ]

Go

Before trying this sample, follow the Go setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Go API reference documentation.

import (
	"context"
	"fmt"
	"io"

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

func testPermissions(w io.Writer, projectID, topicID string) ([]string, error) {
	// projectID := "my-project-id"
	// topicID := "my-topic"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return nil, fmt.Errorf("pubsub.NewClient: %w", err)
	}

	topic := client.Topic(topicID)
	perms, err := topic.IAM().TestPermissions(ctx, []string{
		"pubsub.topics.publish",
		"pubsub.topics.update",
	})
	if err != nil {
		return nil, fmt.Errorf("TestPermissions: %w", err)
	}
	for _, perm := range perms {
		fmt.Fprintf(w, "Allowed: %v\n", perm)
	}
	return perms, nil
}

Java

Before trying this sample, follow the Java setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Java API reference documentation.

import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.iam.v1.TestIamPermissionsRequest;
import com.google.iam.v1.TestIamPermissionsResponse;
import com.google.pubsub.v1.ProjectTopicName;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

public class TestTopicPermissionsExample {

  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String topicId = "your-topic-id";

    testTopicPermissionsExample(projectId, topicId);
  }

  public static void testTopicPermissionsExample(String projectId, String topicId)
      throws IOException {
    try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
      ProjectTopicName topicName = ProjectTopicName.of(projectId, topicId);

      List<String> permissions = new LinkedList<>();
      permissions.add("pubsub.topics.attachSubscription");
      permissions.add("pubsub.topics.publish");
      permissions.add("pubsub.topics.update");

      TestIamPermissionsRequest testIamPermissionsRequest =
          TestIamPermissionsRequest.newBuilder()
              .setResource(topicName.toString())
              .addAllPermissions(permissions)
              .build();

      TestIamPermissionsResponse testedPermissionsResponse =
          topicAdminClient.testIamPermissions(testIamPermissionsRequest);

      System.out.println("Tested:\n" + testedPermissionsResponse);
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Node.js API reference documentation.

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function testTopicPermissions(topicNameOrId) {
  const permissionsToTest = [
    'pubsub.topics.attachSubscription',
    'pubsub.topics.publish',
    'pubsub.topics.update',
  ];

  // Tests the IAM policy for the specified topic
  const [permissions] = await pubSubClient
    .topic(topicNameOrId)
    .iam.testPermissions(permissionsToTest);

  console.log('Tested permissions for topic: %j', permissions);
}

PHP

Before trying this sample, follow the PHP setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub PHP API reference documentation.

use Google\Cloud\PubSub\PubSubClient;

/**
 * Prints the permissions of a topic.
 *
 * @param string $projectId  The Google project ID.
 * @param string $topicName  The Pub/Sub topic name.
 */
function test_topic_permissions($projectId, $topicName)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $topic = $pubsub->topic($topicName);
    $permissions = $topic->iam()->testPermissions([
        'pubsub.topics.attachSubscription',
        'pubsub.topics.publish',
        'pubsub.topics.update'
    ]);
    foreach ($permissions as $permission) {
        printf('Permission: %s' . PHP_EOL, $permission);
    }
}

Python

Before trying this sample, follow the Python setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Python API reference documentation.

from google.cloud import pubsub_v1

# TODO(developer): Choose an existing topic.
# project_id = "your-project-id"
# topic_id = "your-topic-id"

client = pubsub_v1.PublisherClient()
topic_path = client.topic_path(project_id, topic_id)

permissions_to_check = ["pubsub.topics.publish", "pubsub.topics.update"]

allowed_permissions = client.test_iam_permissions(
    request={"resource": topic_path, "permissions": permissions_to_check}
)

print(
    "Allowed permissions for topic {}: {}".format(topic_path, allowed_permissions)
)

Ruby

Before trying this sample, follow the Ruby setup instructions in Quickstart: Using Client Libraries. For more information, see the Pub/Sub Ruby API reference documentation.

# topic_id = "your-topic-id"

pubsub = Google::Cloud::Pubsub.new

topic       = pubsub.topic topic_id
permissions = topic.test_permissions "pubsub.topics.attachSubscription",
                                     "pubsub.topics.publish", "pubsub.topics.update"

puts "Permission to attach subscription" if permissions.include? "pubsub.topics.attachSubscription"
puts "Permission to publish" if permissions.include? "pubsub.topics.publish"
puts "Permission to update" if permissions.include? "pubsub.topics.update"

Sample use case: cross-project communication

Pub/Sub IAM is useful for fine-tuning access in cross-project communication.

Suppose a service account in Cloud Project A wants to publish messages to a topic in Cloud Project B. First, enable the Pub/Sub API in Project A.

Second, grant the service account Edit permission in Cloud Project B. However, this approach is often too coarse. You can use the IAM API to achieve a more fine-grained level of access.

For example, this snippet uses the setIamPolicy() method in project-b and a prepared topic_policy.json file to grant the service account [e-mail] of project-a the publisher role on the topic projects/project-b/topics/topic-b:

gcloud pubsub topics set-iam-policy \
    projects/project-b/topics/topic-b \
    topic_policy.json

Output:

Updated IAM policy for topic topic-b.
bindings:
- members:
  - serviceAccount:[e-mail]
  role: roles/pubsub.publisher
etag: BwWGrQYX6R4=

Partial availability behavior

Authorization checks depend on the IAM subsystem. In order to offer consistently low response latency for data operations (publishing and message consumption), the system may fall back on cached IAM policies. For information about when your changes will take effect, see the IAM documentation.