Set IAM policies

import (
	"context"
	"fmt"
	"io"

	iam "cloud.google.com/go/iam/apiv1/iampb"
	securitycenter "cloud.google.com/go/securitycenter/apiv1"
)

// setSourceIamPolicy grants user roles/securitycenter.findingsEditor permision
// for a source. sourceName is the full resource name of the source to be
// updated. user is an email address that IAM can grant permissions to.
func setSourceIamPolicy(w io.Writer, sourceName string, user string) error {
	// sourceName := "organizations/111122222444/sources/1234"
	// user := "someuser@some_domain.com
	// Instantiate a context and a security service client to make API calls.
	ctx := context.Background()
	client, err := securitycenter.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("securitycenter.NewClient: %w", err)
	}
	defer client.Close() // Closing the client safely cleans up background resources.

	// Retrieve the existing policy so we can update only a specific
	// field.
	existing, err := client.GetIamPolicy(ctx, &iam.GetIamPolicyRequest{
		Resource: sourceName,
	})
	if err != nil {
		return fmt.Errorf("GetIamPolicy(%s): %w", sourceName, err)
	}

	req := &iam.SetIamPolicyRequest{
		Resource: sourceName,
		Policy: &iam.Policy{
			// Enables partial update of existing policy
			Etag: existing.Etag,
			Bindings: []*iam.Binding{{
				Role: "roles/securitycenter.findingsEditor",
				// New IAM Binding for the user.
				Members: []string{fmt.Sprintf("user:%s", user)},
			},
			},
		},
	}
	policy, err := client.SetIamPolicy(ctx, req)
	if err != nil {
		return fmt.Errorf("SetIamPolicy(%s, %v): %w", sourceName, req.Policy, err)
	}

	fmt.Fprint(w, "Bindings:\n")
	for _, binding := range policy.Bindings {
		for _, member := range binding.Members {
			fmt.Fprintf(w, "Principal: %s Role: %s\n", member, binding.Role)
		}
	}
	return nil
}

static Policy setIamPolicySource(SourceName sourceName, String userEmail) {
  try (SecurityCenterClient client = SecurityCenterClient.create()) {
    // userEmail = "someuser@domain.com"
    // Set up IAM Policy for the user userMail to use the role findingsEditor.
    // The user must be a valid google account.
    Policy oldPolicy = client.getIamPolicy(sourceName.toString());
    Binding bindings =
        Binding.newBuilder()
            .setRole("roles/securitycenter.findingsEditor")
            .addMembers("user:" + userEmail)
            .build();
    Policy policy = oldPolicy.toBuilder().addBindings(bindings).build();

    // Start setting up a request to set IAM policy for a source.
    // SourceName sourceName = SourceName.of("123234324", "423432321");
    SetIamPolicyRequest.Builder request =
        SetIamPolicyRequest.newBuilder().setPolicy(policy).setResource(sourceName.toString());

    // Call the API.
    Policy response = client.setIamPolicy(request.build());

    System.out.println("Policy: " + response);
    return response;
  } catch (IOException e) {
    throw new RuntimeException("Couldn't create client.", e);
  }
}

// Imports the Google Cloud client library.
const {SecurityCenterClient} = require('@google-cloud/security-center');

// Creates a new client.
const client = new SecurityCenterClient();

async function setSourceIamPolicy() {
  // sourceName is the full resource name of the source to be
  // updated.
  // user is an email address that IAM can grant permissions to.
  /*
   * TODO(developer): Uncomment the following lines
   */
  // const sourceName = "organizations/111122222444/sources/1234";
  // const user = "someuser@domain.com";
  const [existingPolicy] = await client.getIamPolicy({
    resource: sourceName,
  });

  const [updatedPolicy] = await client.setIamPolicy({
    resource: sourceName,
    policy: {
      // Enables partial update of existing policy
      etag: existingPolicy.etag,
      bindings: [
        {
          role: 'roles/securitycenter.findingsEditor',
          // New IAM Binding for the user.
          members: [`user:${user}`],
        },
      ],
    },
  });
  console.log('Updated policy: %j', updatedPolicy);
}
setSourceIamPolicy();

from google.cloud import securitycenter_v1
from google.iam.v1 import policy_pb2

client = securitycenter_v1.SecurityCenterClient()

# 'source_name' is the resource path for a source that has been
# created previously (you can use list_sources to find a specific one).
# Its format is:
# source_name = "organizations/{organization_id}/sources/{source_id}"
# e.g.:
# source_name = "organizations/111122222444/sources/1234"
# Get the old policy so we can do an incremental update.
old_policy = client.get_iam_policy(request={"resource": source_name})
print(f"Old Policy: {old_policy}")

# Setup a new IAM binding.
binding = policy_pb2.Binding()
binding.role = "roles/securitycenter.findingsEditor"
# user_email is an e-mail address known to Cloud IAM (e.g. a gmail address).
# user_mail = user@somedomain.com
binding.members.append(f"user:{user_email}")

# Setting the e-tag avoids over-write existing policy
updated = client.set_iam_policy(
    request={
        "resource": source_name,
        "policy": {"etag": old_policy.etag, "bindings": [binding]},
    }
)

print(f"Updated Policy: {updated}")