Eseguire l'autenticazione e connettersi a un database

gcloud firestore databases describe \
--database=DATABASE_ID \
--format='yaml(locationId, uid)'

com.google.cloud:google-cloud-firestore-admin:3.33.1
com.google.cloud:google-cloud-resourcemanager:1.76.0

import com.google.cloud.firestore.v1.FirestoreAdminClient;
import com.google.cloud.resourcemanager.v3.ProjectName;
import com.google.cloud.resourcemanager.v3.ProjectsClient;
import com.google.firestore.admin.v1.CreateUserCredsRequest;
import com.google.firestore.admin.v1.GetUserCredsRequest;
import com.google.firestore.admin.v1.UserCreds;
import com.google.iam.v1.Binding;
import com.google.iam.v1.GetIamPolicyRequest;
import com.google.iam.v1.GetPolicyOptions;
import com.google.iam.v1.Policy;
import com.google.iam.v1.SetIamPolicyRequest;
import com.google.protobuf.FieldMask;
import com.google.type.Expr;

public class FirestoreUserCredsExample {
  /**
   *   Provision user credentials and configure an IAM policy to allow SCRAM authentication into the
   *   specified Firestore with Mongo Compatibility database.
   */
  private static void provisionFirestoreUserCredsAndIAM(
      String projectId, String databaseId, String userName) throws Exception {
    UserCreds userCreds = createUserCreds(projectId, databaseId, userName);

    // Note the password returned in the UserCreds proto - it cannot be retrieved again
    // after the initial call to the createUserCreds API.
    System.out.printf(
        "Created credentials for username: %s:\nIAM principal: %s\nPassword: [%s]\n",
        userName, userCreds.getResourceIdentity().getPrincipal(), userCreds.getSecurePassword());

    // Provision an IAM binding for the principal associated with these user credentials.
    updateIamPolicyForUserCreds(projectId, databaseId, userName, userCreds);

    // Emit the password again.
    System.out.printf(
        "Successfully configured IAM policy for database: %s, username: %s\n",
        databaseId, userName);
    System.out.printf("Please make a note of the password: [%s]\n", userCreds.getSecurePassword());
  }

  /** Provision new user credentials using the FirestoreAdminClient. */
  private static UserCreds createUserCreds(String projectId, String databaseId, String userName)
      throws Exception {
    FirestoreAdminClient firestoreAdminClient = FirestoreAdminClient.create();
    return firestoreAdminClient.createUserCreds(
        CreateUserCredsRequest.newBuilder()
            .setParent(String.format("projects/%s/databases/%s", projectId, databaseId))
            .setUserCredsId(userName)
            .build());
  }

  /** Update the IAM policy using the Resource Manager ProjectsClient. */
  private static void updateIamPolicyForUserCreds(
      String projectId, String databaseId, String userName, UserCreds userCreds) throws Exception {
    try (ProjectsClient projectsClient = ProjectsClient.create()) {
      ProjectName projectName = ProjectName.of(projectId);

      // Get the current IAM policy.
      Policy currentPolicy =
          projectsClient.getIamPolicy(
              GetIamPolicyRequest.newBuilder()
                  .setResource(projectName.toString())
                  .setOptions(GetPolicyOptions.newBuilder().setRequestedPolicyVersion(3).build())
                  .build());

      String role = "roles/datastore.user";
      String title = String.format("Conditional IAM binding for %s", userName);
      String expression =
          String.format("resource.name == \"projects/%s/databases/%s\"", projectId, databaseId);

      // Construct an updated IAM policy with an additional binding for the user credentials.
      Policy.Builder policyBuilder = currentPolicy.toBuilder();
      Binding newBinding =
          Binding.newBuilder()
              .setRole(role)
              .setCondition(Expr.newBuilder().setTitle(title).setExpression(expression).build())
              .addMembers(userCreds.getResourceIdentity().getPrincipal())
              .build();
      policyBuilder.addBindings(newBinding);

      // Update the policy
      SetIamPolicyRequest request =
          SetIamPolicyRequest.newBuilder()
              .setResource(projectName.toString())
              .setPolicy(policyBuilder.build())
              .setUpdateMask(FieldMask.newBuilder().addPaths("bindings").addPaths("etag").build())
              .build();
      System.out.println(request);

      Policy updatedPolicy = projectsClient.setIamPolicy(request);
      System.out.println("Policy updated successfully: " + updatedPolicy);
    }
  }
}

pip install google-cloud-iam
pip install google-cloud-firestore
pip install google-cloud-resource-manager

from google.cloud import resourcemanager_v3
from google.cloud.firestore_admin_v1 import FirestoreAdminClient
from google.cloud.firestore_admin_v1 import types
from google.iam.v1 import iam_policy_pb2
from google.iam.v1 import policy_pb2
from google.type import expr_pb2

def create_user_creds(project_id: str, database_id: str, user_name: str):
  """Provision new user credentials using the FirestoreAdminClient."""
  client = FirestoreAdminClient()
  request = types.CreateUserCredsRequest(
      parent=f'projects/{project_id}/databases/{database_id}',
      user_creds_id=user_name,
  )
  response = client.create_user_creds(request)
  return response

def update_iam_policy_for_user_creds(
    project_id: str, database_id: str, user_name: str, user_creds
):
  """Update the IAM policy using the Resource Manager ProjectsClient."""
  client = resourcemanager_v3.ProjectsClient()
  request = iam_policy_pb2.GetIamPolicyRequest()
  request.resource = f'projects/{project_id}'
  request.options.requested_policy_version = 3

  # Get the current IAM policy
  current_policy = client.get_iam_policy(request)

  # Construct an updated IAM policy with an additional binding
  # for the user credentials.
  updated_policy = policy_pb2.Policy()
  binding = policy_pb2.Binding()
  iam_condition = expr_pb2.Expr()

  iam_condition.title = f'Conditional IAM binding for {user_name}'
  iam_condition.expression = (
      f'resource.name == "projects/{project_id}/databases/{database_id}"'
  )

  binding.role = 'roles/datastore.user'
  binding.condition.CopyFrom(iam_condition)
  binding.members.append(user_creds.resource_identity.principal)
  updated_policy.bindings.append(binding)

  # Update the policy
  updated_policy.MergeFrom(current_policy)
  set_policy_request = iam_policy_pb2.SetIamPolicyRequest()
  set_policy_request.resource = f'projects/{project_id}'
  set_policy_request.policy.CopyFrom(updated_policy)

  final_policy = client.set_iam_policy(set_policy_request)
  print(f'Policy updated successfully {final_policy}')

def provision_firestore_user_creds_and_iam(
    project_id: str, database_id: str, user_name: str
):
  """Provision user credentials and configure an IAM policy."""
  user_creds = create_user_creds(project_id, database_id, user_name)

  # Note the password returned in the UserCreds proto - it cannot be
  # retrieved again after the initial call to the create_user_creds API.
  print(f'Created credentials for username: {user_name}')
  print(f'IAM principal: {user_creds.resource_identity.principal}')
  print(f'Password: [{user_creds.secure_password}]')

  # Provision an IAM binding for the principal associated with
  # these user credentials.
  update_iam_policy_for_user_creds(
      project_id, database_id, user_name, user_creds
  )

  # Emit the password again
  print(
      f'Successfully configured IAM policy for database: {database_id},'
      f' username: {user_name}'
  )
  print(f'Please make a note of the password: [{user_creds.secure_password}]')