List roles

Demonstrates listing roles.

Explore further

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

• Create and manage custom roles

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;
[](std::string const& project) {
  iam::IAMClient client(iam::MakeIAMConnection());
  int count = 0;
  google::iam::admin::v1::ListRolesRequest request;
  request.set_parent(project);
  for (auto& role : client.ListRoles(request)) {
    if (!role) throw std::move(role).status();
    std::cout << "Roles successfully retrieved: " << role->name() << "\n";
    ++count;
  }
  if (count == 0) {
    std::cout << "No roles found in project: " << project << "\n";
  }
}

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.Collections.Generic;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Iam.v1;
using Google.Apis.Iam.v1.Data;

public partial class CustomRoles
{
    public static IList<Role> ListRoles(string projectId)
    {
        var credential = GoogleCredential.GetApplicationDefault()
            .CreateScoped(IamService.Scope.CloudPlatform);
        var service = new IamService(new IamService.Initializer
        {
            HttpClientInitializer = credential
        });

        var response = service.Projects.Roles.List("projects/" + projectId)
            .Execute();
        foreach (var role in response.Roles)
        {
            Console.WriteLine(role.Name);
        }
        return response.Roles;
    }
}

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"
	"fmt"
	"io"

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

// listRoles lists a project's roles.
func listRoles(w io.Writer, projectID string) ([]*iam.Role, error) {
	ctx := context.Background()
	service, err := iam.NewService(ctx)
	if err != nil {
		return nil, fmt.Errorf("iam.NewService: %w", err)
	}

	response, err := service.Projects.Roles.List("projects/" + projectID).Do()
	if err != nil {
		return nil, fmt.Errorf("Projects.Roles.List: %w", err)
	}
	for _, role := range response.Roles {
		fmt.Fprintf(w, "Listing role: %v\n", role.Name)
	}
	return response.Roles, 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.cloud.iam.admin.v1.IAMClient.ListRolesPagedResponse;
import com.google.iam.admin.v1.ListRolesRequest;
import java.io.IOException;

/** List roles in a project. */
public class ListRoles {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace the variable before running the sample.
    String projectId = "your-project-id";

    listRoles(projectId);
  }

  public static void listRoles(String projectId) throws IOException {
    ListRolesRequest listRolesRequest =
        ListRolesRequest.newBuilder().setParent("projects/" + projectId).build();

    // Initialize client for sending requests. This client only needs to be created
    // once, and can be reused for multiple requests.
    try (IAMClient iamClient = IAMClient.create()) {
      ListRolesPagedResponse listRolesResponse = iamClient.listRoles(listRolesRequest);
      listRolesResponse.iterateAll().forEach(role -> System.out.println(role));
    }
  }
}

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.iam_admin_v1 import IAMClient, ListRolesRequest, RoleView
from google.cloud.iam_admin_v1.services.iam.pagers import ListRolesPager


def list_roles(
    project_id: str, show_deleted: bool = True, role_view: RoleView = RoleView.BASIC
) -> ListRolesPager:
    """Lists IAM roles in a GCP project.

    Args:
        project_id: GCP project ID
        show_deleted: Whether to include deleted roles in the results
        role_view: Level of detail for the returned roles (e.g., BASIC or FULL)

    Returns: A pager for traversing through the roles
    """

    client = IAMClient()
    parent = f"projects/{project_id}"
    request = ListRolesRequest(parent=parent, show_deleted=show_deleted, view=role_view)
    roles = client.list_roles(request)
    for page in roles.pages:
        for role in page.roles:
            print(role)
    print("Listed all iam roles")
    return roles

What's next

To search and filter code samples for other Google Cloud products, see the Google Cloud sample browser.