feat(iam): add iam bindings to crds

api/v1/iam_binding.go

@@ -0,0 +1,29 @@
+/*
+Copyright 2022.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1
+
+// IamBinding provides authorative binding of permissions to for the resource.
+type IamBinding struct {
+	// Role granted for the service accounts on topic / subscription level.
+	//+kubebuilder:validation:Required
+	//+kubebuilder:example="roles/pubsub.publisher"
+	Role string `json:"role"`
+
+	// Service accounts assigned with the role
+	//+kubebuilder:validation:Required
+	ServiceAccounts []string `json:"serviceAccounts"`
+}

api/v1/subscription_types.go

@@ -37,6 +37,10 @@ type SubscriptionSpec struct {
 	// project ID of topic
 	//+kubebuilder:validation:XValidation:message="Immutable field",rule="self == oldSelf"
 	TopicProjectID string `json:"topicProjectID,omitempty"`
+
+	// Authorative IAM Binding for subscription
+	//+kubebuilder:validation:Optional
+	Bindings []IamBinding `json:"bindings,omitempty"`
 }
 
 // SubscriptionStatus defines the observed state of Subscription

api/v1/topic_types.go

@@ -29,6 +29,10 @@ type TopicSpec struct {
 	// ID of topic
 	//+kubebuilder:validation:XValidation:message="Immutable field",rule="self == oldSelf"
 	TopicID string `json:"topicID,omitempty"`
+
+	// Authorative IAM Binding for topic
+	//+kubebuilder:validation:Optional
+	Bindings []IamBinding `json:"bindings,omitempty"`
 }
 
 // TopicStatus defines the observed state of Topic

config/crd/bases/googlecloudpubsuboperator.quipper.github.io_subscriptions.yaml

@@ -34,6 +34,27 @@ spec:
           spec:
             description: SubscriptionSpec defines the desired state of Subscription
             properties:
+              bindings:
+                description: Authorative IAM Binding for subscription
+                items:
+                  description: IamBinding provides authorative binding of permissions
+                    to for the resource.
+                  properties:
+                    role:
+                      description: Role granted for the service accounts on topic
+                        / subscription level.
+                      example: roles/pubsub.publisher
+                      type: string
+                    serviceAccounts:
+                      description: Service accounts assigned with the role
+                      items:
+                        type: string
+                      type: array
+                  required:
+                  - role
+                  - serviceAccounts
+                  type: object
+                type: array
               subscriptionID:
                 description: subscription ID
                 type: string

config/crd/bases/googlecloudpubsuboperator.quipper.github.io_topics.yaml

@@ -34,6 +34,27 @@ spec:
           spec:
             description: TopicSpec defines the desired state of Topic
             properties:
+              bindings:
+                description: Authorative IAM Binding for topic
+                items:
+                  description: IamBinding provides authorative binding of permissions
+                    to for the resource.
+                  properties:
+                    role:
+                      description: Role granted for the service accounts on topic
+                        / subscription level.
+                      example: roles/pubsub.publisher
+                      type: string
+                    serviceAccounts:
+                      description: Service accounts assigned with the role
+                      items:
+                        type: string
+                      type: array
+                  required:
+                  - role
+                  - serviceAccounts
+                  type: object
+                type: array
               projectID:
                 description: ID of project
                 type: string

internal/controller/subscription_controller.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"time"
 
+	"cloud.google.com/go/iam"
 	"cloud.google.com/go/pubsub"
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -102,6 +103,14 @@ func (r *SubscriptionReconciler) Reconcile(ctx context.Context, req ctrl.Request
 		if isPubSubAlreadyExistsError(err) {
 			// don't treat as error
 			logger.Info("PubSub subscription already exists")
+
+			// update iam policy
+			if err = r.updateIamPolicy(ctx, subscription.Spec.SubscriptionProjectID, subscription.Spec.SubscriptionID, subscription.Spec.Bindings); err != nil {
+				logger.Error(err, "Unable to update iam policy for topic")
+				return ctrl.Result{}, err
+			}
+			logger.Info("Updated IAM policy for subscription", "id", subscription.Spec.SubscriptionID)
+
 			subscriptionPatch := crclient.MergeFrom(subscription.DeepCopy())
 			subscription.Status.Phase = googlecloudpubsuboperatorv1.SubscriptionStatusPhaseActive
 			if err := r.Client.Status().Patch(ctx, &subscription, subscriptionPatch); err != nil {
@@ -130,6 +139,13 @@ func (r *SubscriptionReconciler) Reconcile(ctx context.Context, req ctrl.Request
 	}
 	logger.Info(fmt.Sprintf("Subscription created: %v", s.ID()), "subscription", subscription)
 
+	// update iam policy
+	if err = r.updateIamPolicy(ctx, subscription.Spec.SubscriptionProjectID, subscription.Spec.SubscriptionID, subscription.Spec.Bindings); err != nil {
+		logger.Error(err, "Unable to update iam policy for topic")
+		return ctrl.Result{}, err
+	}
+	logger.Info("Updated IAM policy for subscription", "id", s.ID())
+
 	subscriptionPatch := crclient.MergeFrom(subscription.DeepCopy())
 	subscription.Status.Phase = googlecloudpubsuboperatorv1.SubscriptionStatusPhaseActive
 	if err := r.Client.Status().Patch(ctx, &subscription, subscriptionPatch); err != nil {
@@ -184,3 +200,24 @@ func (r *SubscriptionReconciler) deleteSubscription(ctx context.Context, subscri
 	}
 	return nil
 }
+
+// updateIamPolicy sets the topic iam policy to match the defined spec, if the bindings are non nil.
+func (r *SubscriptionReconciler) updateIamPolicy(ctx context.Context, projectID, subscriptionID string, bindings []googlecloudpubsuboperatorv1.IamBinding) error {
+	if bindings != nil {
+		c, err := r.NewClient(ctx, projectID)
+		if err != nil {
+			return fmt.Errorf("pubsub.NewClient: %w", err)
+		}
+		defer c.Close()
+
+		policy := &iam.Policy{}
+		for _, bind := range bindings {
+			for _, member := range bind.ServiceAccounts {
+				policy.Add(member, iam.RoleName(bind.Role))
+			}
+		}
+
+		return c.Subscription(subscriptionID).IAM().SetPolicy(ctx, policy)
+	}
+	return nil
+}

internal/controller/subscription_controller_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"time"
 
+	"cloud.google.com/go/iam"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 	googlecloudpubsuboperatorv1 "github.com/quipper/google-cloud-pubsub-operator/api/v1"
@@ -52,6 +53,61 @@ var _ = Describe("Subscription controller", func() {
 			}, 3*time.Second, 100*time.Millisecond).Should(Succeed())
 		})
 
+		It("Should create a Pub/Sub Subscription with IAM Binding", func(ctx context.Context) {
+			const projectID = "subscription-project-1"
+			const subscriptionID = "my-subscription-with-iam"
+			psClient, err := pubsubtest.NewClient(ctx, projectID, psServer)
+			Expect(err).ShouldNot(HaveOccurred())
+
+			By("Creating a Topic")
+			topicID := "my-topic-2"
+			_, err = psClient.CreateTopic(ctx, topicID)
+			Expect(err).ShouldNot(HaveOccurred())
+
+			By("Creating a Subscription")
+			subscription := &googlecloudpubsuboperatorv1.Subscription{
+				TypeMeta: metav1.TypeMeta{
+					APIVersion: "googlecloudpubsuboperator.quipper.github.io/v1",
+					Kind:       "Subscription",
+				},
+				ObjectMeta: metav1.ObjectMeta{
+					GenerateName: "example-",
+					Namespace:    "default",
+				},
+				Spec: googlecloudpubsuboperatorv1.SubscriptionSpec{
+					SubscriptionProjectID: projectID,
+					SubscriptionID:        subscriptionID,
+					TopicProjectID:        projectID,
+					TopicID:               topicID,
+					Bindings: []googlecloudpubsuboperatorv1.IamBinding{
+						{
+							Role: "roles/pubsub.consumer",
+							ServiceAccounts: []string{
+								"[email protected]",
+							},
+						},
+					},
+				},
+			}
+			Expect(k8sClient.Create(ctx, subscription)).Should(Succeed())
+
+			By("Checking if the Subscription exists")
+			Eventually(func(g Gomega) {
+				sub := psClient.Subscription(subscriptionID)
+				subscriptionExists, err := sub.Exists(ctx)
+				g.Expect(err).ShouldNot(HaveOccurred())
+				g.Expect(subscriptionExists).Should(BeTrue())
+
+				policy, err := sub.IAM().Policy(ctx)
+				g.Expect(err).ShouldNot(HaveOccurred())
+
+				consumers := policy.Members(iam.RoleName("roles/pubsub.consumer"))
+				g.Expect(consumers).Should(ContainElement("[email protected]"))
+				g.Expect(consumers).Should(HaveLen(1))
+
+			}, 3*time.Second, 100*time.Millisecond).Should(Succeed())
+		})
+
 		It("Should update the status if error", func(ctx context.Context) {
 			const projectID = "subscription-project-2"
 

internal/controller/suite_test.go

@@ -20,16 +20,20 @@ import (
 	"context"
 	"fmt"
 	"path/filepath"
+	"reflect"
 	"runtime"
 	"testing"
 	"time"
+	"unsafe"
 
+	"cloud.google.com/go/iam/apiv1/iampb"
 	"cloud.google.com/go/pubsub"
 	"cloud.google.com/go/pubsub/pstest"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 	"github.com/quipper/google-cloud-pubsub-operator/internal/pubsubtest"
 	"google.golang.org/api/option"
+	"google.golang.org/grpc"
 	"k8s.io/client-go/kubernetes/scheme"
 	"k8s.io/client-go/rest"
 	clocktesting "k8s.io/utils/clock/testing"
@@ -104,6 +108,21 @@ var _ = BeforeSuite(func() {
 	psServer = pstest.NewServer(
 		pubsubtest.CreateTopicErrorInjectionReactor(),
 	)
+
+	// try to get access to `Gsrv` thru `*testutil.Server`, that's on first field of `pstest.Server`
+	rs := reflect.ValueOf(psServer).Elem()
+
+	// *testutil.Server
+	tsrv := rs.Field(0)
+	tsrv = reflect.NewAt(tsrv.Type(), unsafe.Pointer(tsrv.UnsafeAddr())).Elem()
+
+	// *grpc.Server is found from the exported field `Gsrv`
+	gsrv := reflect.Indirect(tsrv).FieldByName("Gsrv").Interface().(*grpc.Server)
+
+	// trying to register fake iam policy server
+	// this fails randomly because Registering is not possible after `grsv.Serve()` is called.
+	iampb.RegisterIAMPolicyServer(gsrv, pubsubtest.CreateFakeIamPolicyServer())
+
 	DeferCleanup(func() {
 		Expect(psServer.Close()).Should(Succeed())
 	})