Update IAM policy

Update a table's IAM policy.

Explore further

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

• Control access to resources with IAM

Code sample

Go

Before trying this sample, follow the Go setup instructions in the BigQuery quickstart using client libraries. For more information, see the BigQuery Go API reference documentation.

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

import (
	"context"
	"fmt"

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

// updateIAMPolicy demonstrates updating the ACL on a BigQuery table by adding a new entry to
// an existing policy.
func updateIAMPolicy(projectID, datasetID, tableID string) error {
	// projectID := "my-project-id"
	// datasetID := "mydataset"
	// tableID := "mytable"
	ctx := context.Background()
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %w", err)
	}
	defer client.Close()

	table := client.Dataset(datasetID).Table(tableID)
	policy, err := table.IAM().Policy(ctx)
	if err != nil {
		return fmt.Errorf("failed to get table policy: %w", err)
	}
	newRole := iam.RoleName("roles/bigquery.dataViewer")
	newMember := "allAuthenticatedUsers"
	policy.Add(newMember, newRole)

	if err := table.IAM().SetPolicy(ctx, policy); err != nil {
		return fmt.Errorf("failed to set new table policy: %w", err)
	}

	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the BigQuery quickstart using client libraries. For more information, see the BigQuery Java API reference documentation.

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

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;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

// Sample to update iam policy in table
public class UpdateIamPolicy {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    String datasetName = "MY_DATASET_NAME";
    String tableName = "MY_TABLE_NAME";
    updateIamPolicy(datasetName, tableName);
  }

  public static void updateIamPolicy(String datasetName, String tableName) {
    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();

      TableId tableId = TableId.of(datasetName, tableName);

      Policy policy = bigquery.getIamPolicy(tableId);
      Map<Role, Set<Identity>> binding = new HashMap<>(policy.getBindings());
      binding.remove(Role.of("roles/bigquery.dataViewer"));

      policy.toBuilder().setBindings(binding).build();
      bigquery.setIamPolicy(tableId, policy);

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

What's next

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