Controlla l'accesso alle risorse con IAM

import (
	"context"
	"fmt"
	"io"

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

// grantAccessToDataset creates a new ACL conceding the READER role to the group "example-analyst-group@google.com"
// For more information on the types of ACLs available see:
// https://cloud.google.com/storage/docs/access-control/lists
func grantAccessToDataset(w io.Writer, projectID, datasetID string) error {
	// TODO(developer): uncomment and update the following lines:
	// projectID := "my-project-id"
	// datasetID := "mydataset"

	ctx := context.Background()

	// Create BigQuery handler.
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %w", err)
	}
	defer client.Close()

	// Create dataset handler
	dataset := client.Dataset(datasetID)

	// Get metadata
	meta, err := dataset.Metadata(ctx)
	if err != nil {
		return fmt.Errorf("bigquery.Dataset.Metadata: %w", err)
	}

	// Find more details about BigQuery Entity Types here:
	// https://pkg.go.dev/cloud.google.com/go/bigquery#EntityType
	//
	// Find more details about BigQuery Access Roles here:
	// https://pkg.go.dev/cloud.google.com/go/bigquery#AccessRole

	entityType := bigquery.GroupEmailEntity
	entityID := "example-analyst-group@google.com"
	roleType := bigquery.ReaderRole

	// Append a new access control entry to the existing access list.
	update := bigquery.DatasetMetadataToUpdate{
		Access: append(meta.Access, &bigquery.AccessEntry{
			Role:       roleType,
			EntityType: entityType,
			Entity:     entityID,
		}),
	}

	// Leverage the ETag for the update to assert there's been no modifications to the
	// dataset since the metadata was originally read.
	meta, err = dataset.Update(ctx, update, meta.ETag)
	if err != nil {
		return err
	}

	fmt.Fprintf(w, "Details for Access entries in dataset %v.\n", datasetID)
	for _, access := range meta.Access {
		fmt.Fprintln(w)
		fmt.Fprintf(w, "Role: %s\n", access.Role)
		fmt.Fprintf(w, "Entities: %v\n", access.Entity)
	}

	return nil
}

import com.google.cloud.bigquery.Acl;
import com.google.cloud.bigquery.Acl.Entity;
import com.google.cloud.bigquery.Acl.Group;
import com.google.cloud.bigquery.Acl.Role;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Dataset;
import com.google.cloud.bigquery.DatasetId;
import java.util.ArrayList;
import java.util.List;

public class GrantAccessToDataset {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    // Project and dataset from which to get the access policy
    String projectId = "MY_PROJECT_ID";
    String datasetName = "MY_DATASET_NAME";
    // Group to add to the ACL
    String entityEmail = "group-to-add@example.com";

    grantAccessToDataset(projectId, datasetName, entityEmail);
  }

  public static void grantAccessToDataset(
      String projectId, String datasetName, String entityEmail) {
    try {
      // Initialize client that will be used to send requests. This client only needs to be created
      // once, and can be reused for multiple requests.
      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

      // Create datasetId with the projectId and the datasetName.
      DatasetId datasetId = DatasetId.of(projectId, datasetName);
      Dataset dataset = bigquery.getDataset(datasetId);

      // Create a new Entity with the corresponding type and email
      // "user-or-group-to-add@example.com"
      // For more information on the types of Entities available see:
      // https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Acl.Entity
      // and
      // https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Acl.Entity.Type
      Entity entity = new Group(entityEmail);

      // Create a new ACL granting the READER role to the group with the entity email
      // "user-or-group-to-add@example.com"
      // For more information on the types of ACLs available see:
      // https://cloud.google.com/storage/docs/access-control/lists
      Acl newEntry = Acl.of(entity, Role.READER);

      // Get a copy of the ACLs list from the dataset and append the new entry.
      List<Acl> acls = new ArrayList<>(dataset.getAcl());
      acls.add(newEntry);

      // Update the ACLs by setting the new list.
      Dataset updatedDataset = bigquery.update(dataset.toBuilder().setAcl(acls).build());
      System.out.println(
          "ACLs of dataset \""
              + updatedDataset.getDatasetId().getDataset()
              + "\" updated successfully");
    } catch (BigQueryException e) {
      System.out.println("ACLs were not updated \n" + e.toString());
    }
  }
}

/**
 * TODO(developer): Update and un-comment below lines.
 */

// const datasetId = "my_project_id.my_dataset_name";

// ID of the user or group from whom you are adding access.
// const entityId = "user-or-group-to-add@example.com";

// One of the "Basic roles for datasets" described here:
// https://cloud.google.com/bigquery/docs/access-control-basic-roles#dataset-basic-roles
// const role = "READER";

const {BigQuery} = require('@google-cloud/bigquery');

// Instantiate a client.
const client = new BigQuery();

// Type of entity you are granting access to.
// Find allowed allowed entity type names here:
// https://cloud.google.com/bigquery/docs/reference/rest/v2/datasets#resource:-dataset
const entityType = 'groupByEmail';

async function grantAccessToDataset() {
  const [dataset] = await client.dataset(datasetId).get();

  // The 'access entries' array is immutable. Create a copy for modifications.
  const entries = [...dataset.metadata.access];

  // Append an AccessEntry to grant the role to a dataset.
  // Find more details about the AccessEntry object in the BigQuery documentation:
  // https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.dataset.AccessEntry
  entries.push({
    role,
    [entityType]: entityId,
  });

  // Assign the array of AccessEntries back to the dataset.
  const metadata = {
    access: entries,
  };

  // Update will only succeed if the dataset
  // has not been modified externally since retrieval.
  //
  // See the BigQuery client library documentation for more details on metadata updates:
  // https://cloud.google.com/nodejs/docs/reference/bigquery/latest

  // Update just the 'access entries' property of the dataset.
  await client.dataset(datasetId).setMetadata(metadata);

  console.log(
    `Role '${role}' granted for entity '${entityId}' in '${datasetId}'.`
  );
}

from google.api_core.exceptions import PreconditionFailed
from google.cloud import bigquery
from google.cloud.bigquery.enums import EntityTypes

# TODO(developer): Update and uncomment the lines below.

# ID of the dataset to grant access to.
# dataset_id = "my_project_id.my_dataset"

# ID of the user or group receiving access to the dataset.
# Alternatively, the JSON REST API representation of the entity,
# such as the view's table reference.
# entity_id = "user-or-group-to-add@example.com"

# One of the "Basic roles for datasets" described here:
# https://cloud.google.com/bigquery/docs/access-control-basic-roles#dataset-basic-roles
# role = "READER"

# Type of entity you are granting access to.
# Find allowed allowed entity type names here:
# https://cloud.google.com/python/docs/reference/bigquery/latest/enums#class-googlecloudbigqueryenumsentitytypesvalue
entity_type = EntityTypes.GROUP_BY_EMAIL

# Instantiate a client.
client = bigquery.Client()

# Get a reference to the dataset.
dataset = client.get_dataset(dataset_id)

# The `access_entries` list is immutable. Create a copy for modifications.
entries = list(dataset.access_entries)

# Append an AccessEntry to grant the role to a dataset.
# Find more details about the AccessEntry object here:
# https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.dataset.AccessEntry
entries.append(
    bigquery.AccessEntry(
        role=role,
        entity_type=entity_type,
        entity_id=entity_id,
    )
)

# Assign the list of AccessEntries back to the dataset.
dataset.access_entries = entries

# Update will only succeed if the dataset
# has not been modified externally since retrieval.
#
# See the BigQuery client library documentation for more details on `update_dataset`:
# https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.client.Client#google_cloud_bigquery_client_Client_update_dataset
try:
    # Update just the `access_entries` property of the dataset.
    dataset = client.update_dataset(
        dataset,
        ["access_entries"],
    )

    # Show a success message.
    full_dataset_id = f"{dataset.project}.{dataset.dataset_id}"
    print(
        f"Role '{role}' granted for entity '{entity_id}'"
        f" in dataset '{full_dataset_id}'."
    )
except PreconditionFailed:  # A read-modify-write error
    print(
        f"Dataset '{dataset.dataset_id}' was modified remotely before this update. "
        "Fetch the latest version and retry."
    )

import (
	"context"
	"fmt"
	"io"

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

// viewDatasetAccessPolicies retrieves the ACL for the given dataset
// For more information on the types of ACLs available see:
// https://cloud.google.com/storage/docs/access-control/lists
func viewDatasetAccessPolicies(w io.Writer, projectID, datasetID string) error {
	// TODO(developer): uncomment and update the following lines:
	// projectID := "my-project-id"
	// datasetID := "mydataset"

	ctx := context.Background()

	// Create new client.
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %w", err)
	}
	defer client.Close()

	// Get dataset's metadata.
	meta, err := client.Dataset(datasetID).Metadata(ctx)
	if err != nil {
		return fmt.Errorf("bigquery.Client.Dataset.Metadata: %w", err)
	}

	fmt.Fprintf(w, "Details for Access entries in dataset %v.\n", datasetID)

	// Iterate over access permissions.
	for _, access := range meta.Access {
		fmt.Fprintln(w)
		fmt.Fprintf(w, "Role: %s\n", access.Role)
		fmt.Fprintf(w, "Entity: %v\n", access.Entity)
	}

	return nil
}

import com.google.cloud.bigquery.Acl;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Dataset;
import com.google.cloud.bigquery.DatasetId;
import java.util.List;

public class GetDatasetAccessPolicy {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    // Project and dataset from which to get the access policy.
    String projectId = "MY_PROJECT_ID";
    String datasetName = "MY_DATASET_NAME";
    getDatasetAccessPolicy(projectId, datasetName);
  }

  public static void getDatasetAccessPolicy(String projectId, String datasetName) {
    try {
      // Initialize client that will be used to send requests. This client only needs to be created
      // once, and can be reused for multiple requests.
      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

      // Create datasetId with the projectId and the datasetName.
      DatasetId datasetId = DatasetId.of(projectId, datasetName);
      Dataset dataset = bigquery.getDataset(datasetId);

      // Show ACL details.
      // Find more information about ACL and the Acl Class here:
      // https://cloud.google.com/storage/docs/access-control/lists
      // https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Acl
      List<Acl> acls = dataset.getAcl();
      System.out.println("ACLs in dataset \"" + dataset.getDatasetId().getDataset() + "\":");
      System.out.println(acls.toString());
      for (Acl acl : acls) {
        System.out.println();
        System.out.println("Role: " + acl.getRole());
        System.out.println("Entity: " + acl.getEntity());
      }
    } catch (BigQueryException e) {
      System.out.println("ACLs info not retrieved. \n" + e.toString());
    }
  }
}

/**
 * TODO(developer): Update and un-comment below lines
 */
// const datasetId = "my_project_id.my_dataset";

const {BigQuery} = require('@google-cloud/bigquery');

// Instantiate a client.
const bigquery = new BigQuery();

async function viewDatasetAccessPolicy() {
  const dataset = bigquery.dataset(datasetId);

  const [metadata] = await dataset.getMetadata();
  const accessEntries = metadata.access || [];

  // Show the list of AccessEntry objects.
  // More details about the AccessEntry object in the BigQuery documentation:
  // https://cloud.google.com/nodejs/docs/reference/bigquery/latest
  console.log(
    `${accessEntries.length} Access entries in dataset '${datasetId}':`
  );
  for (const accessEntry of accessEntries) {
    console.log(`Role: ${accessEntry.role || 'null'}`);
    console.log(`Special group: ${accessEntry.specialGroup || 'null'}`);
    console.log(`User by Email: ${accessEntry.userByEmail || 'null'}`);
  }
}

from google.cloud import bigquery

# Instantiate a client.
client = bigquery.Client()

# TODO(developer): Update and uncomment the lines below.

# Dataset from which to get the access policy.
# dataset_id = "my_dataset"

# Get a reference to the dataset.
dataset = client.get_dataset(dataset_id)

# Show the list of AccessEntry objects.
# More details about the AccessEntry object here:
# https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.dataset.AccessEntry
print(
    f"{len(dataset.access_entries)} Access entries found "
    f"in dataset '{dataset_id}':"
)

for access_entry in dataset.access_entries:
    print()
    print(f"Role: {access_entry.role}")
    print(f"Special group: {access_entry.special_group}")
    print(f"User by Email: {access_entry.user_by_email}")

import (
	"context"
	"fmt"
	"io"

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

// revokeAccessToDataset creates a new ACL removing the dataset access to "example-analyst-group@google.com" entity
// For more information on the types of ACLs available see:
// https://cloud.google.com/storage/docs/access-control/lists
func revokeAccessToDataset(w io.Writer, projectID, datasetID, entity string) error {
	// TODO(developer): uncomment and update the following lines:
	// projectID := "my-project-id"
	// datasetID := "mydataset"
	// entity := "user@mydomain.com"

	ctx := context.Background()

	// Create BigQuery client.
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %w", err)
	}
	defer client.Close()

	// Get dataset handler
	dataset := client.Dataset(datasetID)

	// Get dataset metadata
	meta, err := dataset.Metadata(ctx)
	if err != nil {
		return err
	}

	// Create new access entry list by copying the existing and omiting the access entry entity value
	var newAccessList []*bigquery.AccessEntry
	for _, entry := range meta.Access {
		if entry.Entity != entity {
			newAccessList = append(newAccessList, entry)
		}
	}

	// Only proceed with update if something in the access list was removed.
	// Additionally, we use the ETag from the initial metadata to ensure no
	// other changes were made to the access list in the interim.
	if len(newAccessList) < len(meta.Access) {
		update := bigquery.DatasetMetadataToUpdate{
			Access: newAccessList,
		}
		meta, err = dataset.Update(ctx, update, meta.ETag)
		if err != nil {
			return err
		}
	} else {
		return fmt.Errorf("any access entry was revoked")
	}

	fmt.Fprintf(w, "Details for Access entries in dataset %v.\n", datasetID)

	for _, access := range meta.Access {
		fmt.Fprintln(w)
		fmt.Fprintf(w, "Role: %s\n", access.Role)
		fmt.Fprintf(w, "Entity: %v\n", access.Entity)
	}

	return nil
}

import com.google.cloud.bigquery.Acl;
import com.google.cloud.bigquery.Acl.Entity;
import com.google.cloud.bigquery.Acl.Group;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Dataset;
import com.google.cloud.bigquery.DatasetId;
import java.util.List;

public class RevokeDatasetAccess {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    // Project and dataset from which to get the access policy.
    String projectId = "MY_PROJECT_ID";
    String datasetName = "MY_DATASET_NAME";
    // Group to remove from the ACL
    String entityEmail = "group-to-remove@example.com";

    revokeDatasetAccess(projectId, datasetName, entityEmail);
  }

  public static void revokeDatasetAccess(String projectId, String datasetName, String entityEmail) {
    try {
      // Initialize client that will be used to send requests. This client only needs
      // to be created once, and can be reused for multiple requests.
      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

      // Create datasetId with the projectId and the datasetName.
      DatasetId datasetId = DatasetId.of(projectId, datasetName);
      Dataset dataset = bigquery.getDataset(datasetId);

      // Create a new Entity with the corresponding type and email
      // "user-or-group-to-remove@example.com"
      // For more information on the types of Entities available see:
      // https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Acl.Entity
      // and
      // https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Acl.Entity.Type
      Entity entity = new Group(entityEmail);

      // To revoke access to a dataset, remove elements from the Acl list.
      // Find more information about ACL and the Acl Class here:
      // https://cloud.google.com/storage/docs/access-control/lists
      // https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Acl
      // Remove the entity from the ACLs list.
      List<Acl> acls =
          dataset.getAcl().stream().filter(acl -> !acl.getEntity().equals(entity)).toList();

      // Update the ACLs by setting the new list.
      bigquery.update(dataset.toBuilder().setAcl(acls).build());
      System.out.println("ACLs of \"" + datasetName + "\" updated successfully");
    } catch (BigQueryException e) {
      System.out.println("ACLs were not updated \n" + e.toString());
    }
  }
}

/**
 * TODO(developer): Update and un-comment below lines
 */

// const datasetId = "my_project_id.my_dataset"

// ID of the user or group from whom you are revoking access.
// const entityId = "user-or-group-to-remove@example.com"

const {BigQuery} = require('@google-cloud/bigquery');

// Instantiate a client.
const bigquery = new BigQuery();

async function revokeDatasetAccess() {
  const [dataset] = await bigquery.dataset(datasetId).get();

  // To revoke access to a dataset, remove elements from the access list.
  //
  // See the BigQuery client library documentation for more details on access entries:
  // https://cloud.google.com/nodejs/docs/reference/bigquery/latest

  // Filter access entries to exclude entries matching the specified entity_id
  // and assign a new list back to the access list.
  dataset.metadata.access = dataset.metadata.access.filter(entry => {
    return !(
      entry.entity_id === entityId ||
      entry.userByEmail === entityId ||
      entry.groupByEmail === entityId
    );
  });

  // Update will only succeed if the dataset
  // has not been modified externally since retrieval.
  //
  // See the BigQuery client library documentation for more details on metadata updates:
  // https://cloud.google.com/bigquery/docs/updating-datasets

  // Update just the 'access entries' property of the dataset.
  await dataset.setMetadata(dataset.metadata);

  console.log(`Revoked access to '${entityId}' from '${datasetId}'.`);
}

from google.cloud import bigquery
from google.api_core.exceptions import PreconditionFailed

# TODO(developer): Update and uncomment the lines below.

# ID of the dataset to revoke access to.
# dataset_id = "my-project.my_dataset"

# ID of the user or group from whom you are revoking access.
# Alternatively, the JSON REST API representation of the entity,
# such as a view's table reference.
# entity_id = "user-or-group-to-remove@example.com"

# Instantiate a client.
client = bigquery.Client()

# Get a reference to the dataset.
dataset = client.get_dataset(dataset_id)

# To revoke access to a dataset, remove elements from the AccessEntry list.
#
# See the BigQuery client library documentation for more details on `access_entries`:
# https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.dataset.Dataset#google_cloud_bigquery_dataset_Dataset_access_entries

# Filter `access_entries` to exclude entries matching the specified entity_id
# and assign a new list back to the AccessEntry list.
dataset.access_entries = [
    entry for entry in dataset.access_entries
    if entry.entity_id != entity_id
]

# Update will only succeed if the dataset
# has not been modified externally since retrieval.
#
# See the BigQuery client library documentation for more details on `update_dataset`:
# https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.client.Client#google_cloud_bigquery_client_Client_update_dataset
try:
    # Update just the `access_entries` property of the dataset.
    dataset = client.update_dataset(
        dataset,
        ["access_entries"],
    )

    # Notify user that the API call was successful.
    full_dataset_id = f"{dataset.project}.{dataset.dataset_id}"
    print(f"Revoked dataset access for '{entity_id}' to ' dataset '{full_dataset_id}.'")
except PreconditionFailed:  # A read-modify-write error.
    print(
        f"Dataset '{dataset.dataset_id}' was modified remotely before this update. "
        "Fetch the latest version and retry."
    )

import (
	"context"
	"fmt"
	"io"

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

// grantAccessToResource creates a new ACL conceding the VIEWER role to the group "example-analyst-group@google.com"
// For more information on the types of ACLs available see:
// https://cloud.google.com/storage/docs/access-control/lists
func grantAccessToResource(w io.Writer, projectID, datasetID, resourceID string) error {
	// Resource can be a table or a view
	//
	// TODO(developer): uncomment and update the following lines:
	// projectID := "my-project-id"
	// datasetID := "mydataset"
	// resourceID := "myresource"

	ctx := context.Background()

	// Create new client
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %w", err)
	}
	defer client.Close()

	// Get resource policy.
	policy, err := client.Dataset(datasetID).Table(resourceID).IAM().Policy(ctx)
	if err != nil {
		return fmt.Errorf("bigquery.Dataset.Table.IAM.Policy: %w", err)
	}

	// Find more details about IAM Roles here:
	// https://pkg.go.dev/cloud.google.com/go/iam#RoleName
	entityID := "example-analyst-group@google.com"
	roleType := iam.Viewer

	// Add new policy.
	policy.Add(fmt.Sprintf("group:%s", entityID), roleType)

	// Update resource's policy.
	err = client.Dataset(datasetID).Table(resourceID).IAM().SetPolicy(ctx, policy)
	if err != nil {
		return fmt.Errorf("bigquery.Dataset.Table.IAM.Policy: %w", err)
	}

	// Get resource policy again expecting the update.
	policy, err = client.Dataset(datasetID).Table(resourceID).IAM().Policy(ctx)
	if err != nil {
		return fmt.Errorf("bigquery.Dataset.Table.IAM.Policy: %w", err)
	}

	fmt.Fprintf(w, "Details for Access entries in table or view %v.\n", resourceID)

	for _, role := range policy.Roles() {
		fmt.Fprintln(w)
		fmt.Fprintf(w, "Role: %s\n", role)
		fmt.Fprintf(w, "Entities: %v\n", policy.Members(role))
	}

	return nil
}

import com.google.cloud.Identity;
import com.google.cloud.Policy;
import com.google.cloud.Role;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.TableId;

public class GrantAccessToTableOrView {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    // Project, dataset and resource (table or view) from which to get the access policy.
    String projectId = "MY_PROJECT_ID";
    String datasetName = "MY_DATASET_NAME";
    String resourceName = "MY_TABLE_NAME";
    // Role to add to the policy access
    Role role = Role.of("roles/bigquery.dataViewer");
    // Identity to add to the policy access
    Identity identity = Identity.user("user-add@example.com");
    grantAccessToTableOrView(projectId, datasetName, resourceName, role, identity);
  }

  public static void grantAccessToTableOrView(
      String projectId, String datasetName, String resourceName, Role role, Identity identity) {
    try {
      // Initialize client that will be used to send requests. This client only needs
      // to be created once, and can be reused for multiple requests.
      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

      // Create table identity given the projectId, the datasetName and the resourceName.
      TableId tableId = TableId.of(projectId, datasetName, resourceName);

      // Add new user identity to current IAM policy.
      Policy policy = bigquery.getIamPolicy(tableId);
      policy = policy.toBuilder().addIdentity(role, identity).build();

      // Update the IAM policy by setting the new one.
      bigquery.setIamPolicy(tableId, policy);

      System.out.println("IAM policy of resource \"" + resourceName + "\" updated successfully");
    } catch (BigQueryException e) {
      System.out.println("IAM policy was not updated. \n" + e.toString());
    }
  }
}

/**
 * TODO(developer): Update and un-comment below lines
 */
// const projectId = "YOUR_PROJECT_ID";
// const datasetId = "YOUR_DATASET_ID";
// const tableId = "YOUR_TABLE_ID";
// const principalId = "YOUR_PRINCIPAL_ID";
// const role = "YOUR_ROLE";

const {BigQuery} = require('@google-cloud/bigquery');

// Instantiate a client.
const client = new BigQuery();

async function grantAccessToTableOrView() {
  const dataset = client.dataset(datasetId);
  const table = dataset.table(tableId);

  // Get the IAM access policy for the table or view.
  const [policy] = await table.getIamPolicy();

  // Initialize bindings array.
  if (!policy.bindings) {
    policy.bindings = [];
  }

  // To grant access to a table or view
  // add bindings to the Table or View policy.
  //
  // Find more details about Policy and Binding objects here:
  // https://cloud.google.com/security-command-center/docs/reference/rest/Shared.Types/Policy
  // https://cloud.google.com/security-command-center/docs/reference/rest/Shared.Types/Binding
  const binding = {
    role,
    members: [principalId],
  };
  policy.bindings.push(binding);

  // Set the IAM access policy with updated bindings.
  await table.setIamPolicy(policy);

  // Show a success message.
  console.log(
    `Role '${role}' granted for principal '${principalId}' on resource '${datasetId}.${tableId}'.`
  );
}

await grantAccessToTableOrView();

from google.cloud import bigquery

# TODO(developer): Update and uncomment the lines below.

# Google Cloud Platform project.
# project_id = "my_project_id"

# Dataset where the table or view is.
# dataset_id = "my_dataset"

# Table or view name to get the access policy.
# resource_name = "my_table"

# Principal to grant access to a table or view.
# For more information about principal identifiers see:
# https://cloud.google.com/iam/docs/principal-identifiers
# principal_id = "user:bob@example.com"

# Role to grant to the principal.
# For more information about BigQuery roles see:
# https://cloud.google.com/bigquery/docs/access-control
# role = "roles/bigquery.dataViewer"

# Instantiate a client.
client = bigquery.Client()

# Get the full table or view name.
full_resource_name = f"{project_id}.{dataset_id}.{resource_name}"

# Get the IAM access policy for the table or view.
policy = client.get_iam_policy(full_resource_name)

# To grant access to a table or view, add bindings to the IAM policy.
#
# Find more details about Policy and Binding objects here:
# https://cloud.google.com/security-command-center/docs/reference/rest/Shared.Types/Policy
# https://cloud.google.com/security-command-center/docs/reference/rest/Shared.Types/Binding
binding = {
    "role": role,
    "members": [principal_id, ],
}
policy.bindings.append(binding)

# Set the IAM access policy with updated bindings.
updated_policy = client.set_iam_policy(full_resource_name, policy)

# Show a success message.
print(
    f"Role '{role}' granted for principal '{principal_id}'"
    f" on resource '{full_resource_name}'."
)