Get IAM policy

Retrieve IAM policy.

Code sample

Go

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

To authenticate to Data Catalog, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import (
	"context"
	"fmt"
	"io"
	"strings"

	datacatalog "cloud.google.com/go/datacatalog/apiv1beta1"
	"cloud.google.com/go/iam/apiv1/iampb"
)

// getIAMPolicy prints information about the IAM policy associated with a
// given taxonomy or policy tag resource.
func getIAMPolicy(w io.Writer, resourceID string) error {
	// resourceID := "projects/myproject/locations/us/taxonomies/1234"
	ctx := context.Background()
	policyClient, err := datacatalog.NewPolicyTagManagerClient(ctx)
	if err != nil {
		return fmt.Errorf("datacatalog.NewPolicyTagManagerClient: %w", err)
	}
	defer policyClient.Close()

	req := &iampb.GetIamPolicyRequest{
		Resource: resourceID,
		Options: &iampb.GetPolicyOptions{
			RequestedPolicyVersion: 3,
		},
	}
	policy, err := policyClient.GetIamPolicy(ctx, req)
	if err != nil {
		return fmt.Errorf("GetIamPolicy: %w", err)
	}
	fmt.Fprintf(w, "Policy has version %d with Etag %x and %d bindings\n", policy.Version, policy.Etag, len(policy.Bindings))
	if len(policy.Bindings) > 0 {
		for _, binding := range policy.Bindings {
			fmt.Fprintf(w, "\trole %s with %d members: (%s)\n", binding.Role, len(binding.Members), strings.Join(binding.Members, ", "))
		}
	}
	return nil
}

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