Guida rapida

Dimostra l'utilizzo di base di IAM.

Per saperne di più

Per la documentazione dettagliata che include questo esempio di codice, consulta quanto segue:

Esempio di codice

C++

Per scoprire come installare e utilizzare la libreria client per IAM, consulta Librerie client IAM. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API IAM C++.

Per autenticarti in IAM, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

#include "google/cloud/iam/admin/v1/iam_client.h"
#include "google/cloud/project.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[0] << " <project-id>\n";
    return 1;
  }

  // Create a namespace alias to make the code easier to read.
  namespace iam = ::google::cloud::iam_admin_v1;
  iam::IAMClient client(iam::MakeIAMConnection());
  auto const project = google::cloud::Project(argv[1]);
  std::cout << "Service Accounts for project: " << project.project_id() << "\n";
  int count = 0;
  for (auto sa : client.ListServiceAccounts(project.FullName())) {
    if (!sa) throw std::move(sa).status();
    std::cout << sa->name() << "\n";
    ++count;
  }
  if (count == 0) std::cout << "No Service Accounts found.\n";

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

C#

Per scoprire come installare e utilizzare la libreria client per IAM, consulta Librerie client IAM. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API IAM C#.

Per autenticarti in IAM, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 


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

public class QuickStart
{
    public static void Main(string[] args)
    {
        // TODO: Replace with your project ID
        var projectId = "your-project";
        // TODO: Replace with the ID of your member in the form "user:member@example.com"
        var member = "your-member";
        // Role to be granted
        var role = "roles/logging.logWriter";

        // Initialize service
        CloudResourceManagerService crmService = InitializeService();

        // Grant your member the "Log Writer" role for your project
        AddBinding(crmService, projectId, member, role);

        // Get the project's policy and print all members with the the "Log Writer" role
        var policy = GetPolicy(crmService, projectId);
        var binding = policy.Bindings.FirstOrDefault(x => x.Role == role);
        Console.WriteLine("Role: " + binding.Role);
        Console.Write("Members: ");
        foreach (var m in binding.Members)
        {
            Console.Write("[" + m + "] ");
        }
        Console.WriteLine();

        // Remove member from the "Log Writer" role
        RemoveMember(crmService, projectId, member, role);
    }

    public static CloudResourceManagerService InitializeService()
    {
        // Get credentials
        var credential = GoogleCredential.GetApplicationDefault()
            .CreateScoped(IamService.Scope.CloudPlatform);

        // Create the Cloud Resource Manager service object
        CloudResourceManagerService crmService = new CloudResourceManagerService(
            new CloudResourceManagerService.Initializer
            {
                HttpClientInitializer = credential
            });

        return crmService;
    }

    public static Policy GetPolicy(CloudResourceManagerService crmService, String projectId)
    {
        // Get the project's policy by calling the
        // Cloud Resource Manager Projects API
        var policy = crmService.Projects.GetIamPolicy(
            new GetIamPolicyRequest(),
            projectId).Execute();
        return policy;
    }

    public static void SetPolicy(CloudResourceManagerService crmService, String projectId, Policy policy)
    {
        // Set the project's policy by calling the
        // Cloud Resource Manager Projects API
        crmService.Projects.SetIamPolicy(
           new SetIamPolicyRequest
           {
               Policy = policy
           }, projectId).Execute();
    }

    public static void AddBinding(
        CloudResourceManagerService crmService,
        string projectId,
        string member,
        string role)
    {
        // Get the project's policy
        var policy = GetPolicy(crmService, projectId);

        // Find binding in policy
        var binding = policy.Bindings.FirstOrDefault(x => x.Role == role);

        // If binding already exists, add member to binding
        if (binding != null)
        {
            binding.Members.Add(member);
        }
        // If binding does not exist, add binding to policy
        else
        {
            binding = new Binding
            {
                Role = role,
                Members = new List<string> { member }
            };
            policy.Bindings.Add(binding);
        }

        // Set the updated policy
        SetPolicy(crmService, projectId, policy);
    }

    public static void RemoveMember(
        CloudResourceManagerService crmService,
        string projectId,
        string member,
        string role)
    {
        // Get the project's policy 
        var policy = GetPolicy(crmService, projectId);

        // Remove the member from the role
        var binding = policy.Bindings.FirstOrDefault(x => x.Role == role);
        if (binding == null)
        {
            Console.WriteLine("Role does not exist in policy.");
        }
        else
        {
            if (binding.Members.Contains(member))
            {
                binding.Members.Remove(member);
            }
            else
            {
                Console.WriteLine("The member has not been granted this role.");
            }

            if (binding.Members.Count == 0)
            {
                policy.Bindings.Remove(binding);
            }
        }

        // Set the updated policy
        SetPolicy(crmService, projectId, policy);
    }
}

Go

Per scoprire come installare e utilizzare la libreria client per IAM, consulta Librerie client IAM. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API IAM Go.

Per autenticarti in IAM, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 


package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"strings"
	"time"

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

func main() {
	// TODO: Add your project ID
	projectID := flag.String("project_id", "", "Cloud Project ID")
	// TODO: Add the ID of your member in the form "user:member@example.com"
	member := flag.String("member_id", "", "Your member ID")
	flag.Parse()

	// The role to be granted
	var role string = "roles/logging.logWriter"

	// Initializes the Cloud Resource Manager service
	ctx := context.Background()
	crmService, err := cloudresourcemanager.NewService(ctx)
	if err != nil {
		log.Fatalf("cloudresourcemanager.NewService: %v", err)
	}

	// Grants your member the "Log writer" role for your project
	addBinding(crmService, *projectID, *member, role)

	// Gets the project's policy and prints all members with the "Log Writer" role
	policy := getPolicy(crmService, *projectID)
	// Find the policy binding for role. Only one binding can have the role.
	var binding *cloudresourcemanager.Binding
	for _, b := range policy.Bindings {
		if b.Role == role {
			binding = b
			break
		}
	}
	fmt.Println("Role: ", binding.Role)
	fmt.Print("Members: ", strings.Join(binding.Members, ", "))

	// Removes member from the "Log writer" role
	removeMember(crmService, *projectID, *member, role)

}

// addBinding adds the member to the project's IAM policy
func addBinding(crmService *cloudresourcemanager.Service, projectID, member, role string) {

	policy := getPolicy(crmService, projectID)

	// Find the policy binding for role. Only one binding can have the role.
	var binding *cloudresourcemanager.Binding
	for _, b := range policy.Bindings {
		if b.Role == role {
			binding = b
			break
		}
	}

	if binding != nil {
		// If the binding exists, adds the member to the binding
		binding.Members = append(binding.Members, member)
	} else {
		// If the binding does not exist, adds a new binding to the policy
		binding = &cloudresourcemanager.Binding{
			Role:    role,
			Members: []string{member},
		}
		policy.Bindings = append(policy.Bindings, binding)
	}

	setPolicy(crmService, projectID, policy)

}

// removeMember removes the member from the project's IAM policy
func removeMember(crmService *cloudresourcemanager.Service, projectID, member, role string) {

	policy := getPolicy(crmService, projectID)

	// Find the policy binding for role. Only one binding can have the role.
	var binding *cloudresourcemanager.Binding
	var bindingIndex int
	for i, b := range policy.Bindings {
		if b.Role == role {
			binding = b
			bindingIndex = i
			break
		}
	}

	// Order doesn't matter for bindings or members, so to remove, move the last item
	// into the removed spot and shrink the slice.
	if len(binding.Members) == 1 {
		// If the member is the only member in the binding, removes the binding
		last := len(policy.Bindings) - 1
		policy.Bindings[bindingIndex] = policy.Bindings[last]
		policy.Bindings = policy.Bindings[:last]
	} else {
		// If there is more than one member in the binding, removes the member
		var memberIndex int
		for i, mm := range binding.Members {
			if mm == member {
				memberIndex = i
			}
		}
		last := len(policy.Bindings[bindingIndex].Members) - 1
		binding.Members[memberIndex] = binding.Members[last]
		binding.Members = binding.Members[:last]
	}

	setPolicy(crmService, projectID, policy)

}

// getPolicy gets the project's IAM policy
func getPolicy(crmService *cloudresourcemanager.Service, projectID string) *cloudresourcemanager.Policy {

	ctx := context.Background()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()
	request := new(cloudresourcemanager.GetIamPolicyRequest)
	policy, err := crmService.Projects.GetIamPolicy(projectID, request).Do()
	if err != nil {
		log.Fatalf("Projects.GetIamPolicy: %v", err)
	}

	return policy
}

// setPolicy sets the project's IAM policy
func setPolicy(crmService *cloudresourcemanager.Service, projectID string, policy *cloudresourcemanager.Policy) {

	ctx := context.Background()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()
	request := new(cloudresourcemanager.SetIamPolicyRequest)
	request.Policy = policy
	policy, err := crmService.Projects.SetIamPolicy(projectID, request).Do()
	if err != nil {
		log.Fatalf("Projects.SetIamPolicy: %v", err)
	}
}

Java

Per scoprire come installare e utilizzare la libreria client per IAM, consulta Librerie client IAM. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API IAM Java.

Per autenticarti in IAM, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 


import com.google.cloud.iam.admin.v1.IAMClient;
import com.google.iam.admin.v1.ServiceAccountName;
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.protobuf.FieldMask;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Quickstart {

  public static void main(String[] args) throws IOException {
    // TODO: Replace with your project ID.
    String projectId = "your-project";
    // TODO: Replace with your service account name.
    String serviceAccount = "your-service-account";
    // TODO: Replace with the ID of your member in the form "user:member@example.com"
    String member = "your-member";
    // The role to be granted.
    String role = "roles/logging.logWriter";

    quickstart(projectId, serviceAccount, member, role);
  }

  // Creates new policy and adds binding.
  // Checks if changes are present and removes policy.
  public static void quickstart(String projectId, String serviceAccount,
                                String member, String role) throws IOException {

    // Construct the service account email.
    // You can modify the ".iam.gserviceaccount.com" to match the name of the service account
    // to use for authentication.
    serviceAccount = serviceAccount + "@" + projectId + ".iam.gserviceaccount.com";

    // 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()) {

      // Grants your member the "Log writer" role for your project.
      addBinding(iamClient, projectId, serviceAccount, member, role);

      // Get the project's policy and print all members with the "Log Writer" role
      Policy policy = getPolicy(iamClient, projectId, serviceAccount);

      Binding binding = null;
      List<Binding> bindings = policy.getBindingsList();

      for (Binding b : bindings) {
        if (b.getRole().equals(role)) {
          binding = b;
          break;
        }
      }

      System.out.println("Role: " + binding.getRole());
      System.out.print("Members: ");

      for (String m : binding.getMembersList()) {
        System.out.print("[" + m + "] ");
      }
      System.out.println();

      // Removes member from the "Log writer" role.
      removeMember(iamClient, projectId, serviceAccount, member, role);
    }
  }

  public static void addBinding(IAMClient iamClient, String projectId, String serviceAccount,
                                String member, String role) {
    // Gets the project's policy.
    Policy policy = getPolicy(iamClient, projectId, serviceAccount);

    // If policy is not retrieved, return early.
    if (policy == null) {
      return;
    }

    Policy.Builder updatedPolicy = policy.toBuilder();

    // Get the binding if present in the policy.
    Binding binding = null;
    for (Binding b : updatedPolicy.getBindingsList()) {
      if (b.getRole().equals(role)) {
        binding = b;
        break;
      }
    }

    if (binding != null) {
      // If binding already exists, adds member to binding.
      binding.getMembersList().add(member);
    } else {
      // If binding does not exist, adds binding to policy.
      binding = Binding.newBuilder()
              .setRole(role)
              .addMembers(member)
              .build();
      updatedPolicy.addBindings(binding);
    }

    // Sets the updated policy.
    setPolicy(iamClient, projectId, serviceAccount, updatedPolicy.build());
  }

  public static void removeMember(IAMClient iamClient, String projectId, String serviceAccount,
                                  String member, String role) {
    // Gets the project's policy.
    Policy.Builder policy = getPolicy(iamClient, projectId, serviceAccount).toBuilder();

    // Removes the member from the role.
    Binding binding = null;
    for (Binding b : policy.getBindingsList()) {
      if (b.getRole().equals(role)) {
        binding = b;
        break;
      }
    }

    if (binding != null && binding.getMembersList().contains(member)) {
      List<String> newMemberList = new ArrayList<>(binding.getMembersList());
      newMemberList.remove(member);

      Binding newBinding = binding.toBuilder().clearMembers()
              .addAllMembers(newMemberList)
              .build();
      List<Binding> newBindingList = new ArrayList<>(policy.getBindingsList());
      newBindingList.remove(binding);

      if (!newBinding.getMembersList().isEmpty()) {
        newBindingList.add(newBinding);
      }

      policy.clearBindings()
              .addAllBindings(newBindingList);
    }

    // Sets the updated policy.
    setPolicy(iamClient, projectId, serviceAccount, policy.build());
  }

  public static Policy getPolicy(IAMClient iamClient, String projectId, String serviceAccount) {
    // Gets the project's policy by calling the
    // IAMClient API.
    GetIamPolicyRequest request = GetIamPolicyRequest.newBuilder()
            .setResource(ServiceAccountName.of(projectId, serviceAccount).toString())
            .build();
    return iamClient.getIamPolicy(request);
  }

  private static void setPolicy(IAMClient iamClient, String projectId,
                                String serviceAccount, Policy policy) {
    List<String> paths = Arrays.asList("bindings", "etag");
    // Sets a project's policy.
    SetIamPolicyRequest request = SetIamPolicyRequest.newBuilder()
            .setResource(ServiceAccountName.of(projectId, serviceAccount).toString())
            .setPolicy(policy)
            // A FieldMask specifying which fields of the policy to modify. Only
            // the fields in the mask will be modified. If no mask is provided, the
            // following default mask is used:
            // `paths: "bindings, etag"`
            .setUpdateMask(FieldMask.newBuilder().addAllPaths(paths).build())
            .build();
    iamClient.setIamPolicy(request);
  }
}

Python

Per scoprire come installare e utilizzare la libreria client per IAM, consulta Librerie client IAM. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API IAM Python.

Per autenticarti in IAM, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

from google.cloud import resourcemanager_v3
from google.iam.v1 import iam_policy_pb2, policy_pb2


def quickstart(project_id: str, member: str) -> None:
    """Gets a policy, adds a member, prints their permissions, and removes the member.

    project_id: ID or number of the Google Cloud project you want to use.
    member: The principals requesting the access.
    """

    # Role to be granted.
    role = "roles/logging.logWriter"
    crm_service = resourcemanager_v3.ProjectsClient()

    # Grants your member the 'Log Writer' role for the project.
    modify_policy_add_role(crm_service, project_id, role, member)

    # Gets the project's policy and prints all members with the 'Log Writer' role.
    policy = get_policy(crm_service, project_id)
    binding = next(b for b in policy.bindings if b.role == role)
    print(f"Role: {(binding.role)}")
    print("Members: ")
    for m in binding.members:
        print(f"[{m}]")

    # Removes the member from the 'Log Writer' role.
    modify_policy_remove_member(crm_service, project_id, role, member)


def get_policy(
    crm_service: resourcemanager_v3.ProjectsClient, project_id: str
) -> policy_pb2.Policy:
    """Gets IAM policy for a project."""

    request = iam_policy_pb2.GetIamPolicyRequest()
    request.resource = f"projects/{project_id}"

    policy = crm_service.get_iam_policy(request)
    return policy


def set_policy(
    crm_service: resourcemanager_v3.ProjectsClient,
    project_id: str,
    policy: policy_pb2.Policy,
) -> None:
    """Adds a new role binding to a policy."""

    request = iam_policy_pb2.SetIamPolicyRequest()
    request.resource = f"projects/{project_id}"
    request.policy.CopyFrom(policy)

    crm_service.set_iam_policy(request)


def modify_policy_add_role(
    crm_service: resourcemanager_v3.ProjectsClient,
    project_id: str,
    role: str,
    member: str,
) -> None:
    """Adds a new role binding to a policy."""

    policy = get_policy(crm_service, project_id)

    for bind in policy.bindings:
        if bind.role == role:
            bind.members.append(member)
            break
    else:
        binding = policy_pb2.Binding()
        binding.role = role
        binding.members.append(member)
        policy.bindings.append(binding)

    set_policy(crm_service, project_id, policy)


def modify_policy_remove_member(
    crm_service: resourcemanager_v3.ProjectsClient,
    project_id: str,
    role: str,
    member: str,
) -> None:
    """Removes a  member from a role binding."""

    policy = get_policy(crm_service, project_id)

    for bind in policy.bindings:
        if bind.role == role:
            if member in bind.members:
                bind.members.remove(member)
            break

    set_policy(crm_service, project_id, policy)


if __name__ == "__main__":
    # TODO: replace with your project ID
    project_id = "your-project-id"
    # TODO: Replace with the ID of your member in the form 'user:member@example.com'.
    member = "your-member"
    quickstart(project_id, member)

Passaggi successivi

Per cercare e filtrare gli esempi di codice per altri prodotti Google Cloud, consulta il browser di esempi di Google Cloud.