Support role annotation

apis/core/v1alpha1/annotations.go

@@ -35,6 +35,15 @@ const (
 	// TODO(jaypipes): Link to documentation on cross-account resource
 	// management
 	AnnotationOwnerAccountID = AnnotationPrefix + "owner-account-id"
+	// AnnotationRoleARN is an annotation whose value is the identifier
+	// for the AWS role ARN to manage the resources.  If this annotation
+	// is set on a CR, the Kubernetes user is indicating that the ACK service
+	// controller should create/patch/delete the resource in the specified AWS
+	// role. In order for this cross-account resource management to succeed,
+	// the AWS IAM Role that the ACK service controller runs as needs to have
+	// the ability to call the AWS STS::AssumeRole API call and assume an IAM
+	// Role in the target AWS Account.
+	AnnotationRoleARN = AnnotationPrefix + "role-arn"
 	// AnnotationRegion is an annotation whose value is the identifier for the
 	// the AWS region in which the resources should be created. If this annotation
 	// is set on a CR metadata, that means the user is indicating to the ACK service

pkg/runtime/adoption_reconciler.go

@@ -17,6 +17,7 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/aws/aws-sdk-go/aws/arn"
 	"github.com/go-logr/logr"
 	"github.com/pkg/errors"
 	corev1 "k8s.io/api/core/v1"
@@ -128,6 +129,19 @@ func (r *adoptionReconciler) reconcile(ctx context.Context, req ctrlrt.Request)
 			return requeue.NeededAfter(err, roleARNNotAvailableRequeueDelay)
 		}
 	}
+
+	// If a user specified a namespace with role ARN annotation,
+	// we need to get the role and set the accout ID to that role.
+	roleARNFromAnnotation := r.getRoleARNFromAnnotation(res)
+	if roleARNFromAnnotation != "" {
+		roleARN = roleARNFromAnnotation
+		parsedARN, err := arn.Parse(string(roleARNFromAnnotation))
+		if err != nil {
+			return fmt.Errorf("failed to parsed role ARN %q from namespace annotation: %v", roleARNFromAnnotation, err)
+		}
+		acctID = ackv1alpha1.AWSAccountID(parsedARN.AccountID)
+	}
+
 	region := r.getRegion(res)
 	targetDescriptor := rmf.ResourceDescriptor()
 	endpointURL := r.getEndpointURL(res)
@@ -459,6 +473,20 @@ func (r *adoptionReconciler) getOwnerAccountID(
 	return ackv1alpha1.AWSAccountID(r.cfg.AccountID), false
 }
 
+// getRoleARNFromAnnotation gets the role ARN from the namespace
+// annotation.
+func (r *adoptionReconciler) getRoleARNFromAnnotation(
+	res *ackv1alpha1.AdoptedResource,
+) ackv1alpha1.AWSResourceName {
+	// look for role ARN in the namespace annotations
+	namespace := res.GetNamespace()
+	roleARN, ok := r.cache.Namespaces.GetRoleARN(namespace)
+	if ok {
+		return ackv1alpha1.AWSResourceName(roleARN)
+	}
+	return ""
+}
+
 // getEndpointURL returns the AWS account that owns the supplied resource.
 // We look for the namespace associated endpoint url, if that is set we use it.
 // Otherwise if none of these annotations are set we use the endpoint url specified

pkg/runtime/cache/namespace.go

@@ -36,6 +36,8 @@ type namespaceInfo struct {
 	endpointURL string
 	// {service}.services.k8s.aws/deletion-policy Annotations (keyed by service)
 	deletionPolicies map[string]string
+	// services.k8s.aws/role-arn Annotation
+	roleARN string
 }
 
 // getDefaultRegion returns the default region value
@@ -54,6 +56,14 @@ func (n *namespaceInfo) getOwnerAccountID() string {
 	return n.ownerAccountID
 }
 
+// getRoleARN returns the namespace role ARN
+func (n *namespaceInfo) getRoleARN() string {
+	if n == nil {
+		return ""
+	}
+	return n.roleARN
+}
+
 // getEndpointURL returns the namespace Endpoint URL
 func (n *namespaceInfo) getEndpointURL() string {
 	if n == nil {
@@ -182,6 +192,16 @@ func (c *NamespaceCache) GetOwnerAccountID(namespace string) (string, bool) {
 	return "", false
 }
 
+// GetRoleARN returns the role ARN if it exists
+func (c *NamespaceCache) GetRoleARN(namespace string) (string, bool) {
+	info, ok := c.getNamespaceInfo(namespace)
+	if ok {
+		a := info.getRoleARN()
+		return a, a != ""
+	}
+	return "", false
+}
+
 // GetEndpointURL returns the endpoint URL if it exists
 func (c *NamespaceCache) GetEndpointURL(namespace string) (string, bool) {
 	info, ok := c.getNamespaceInfo(namespace)
@@ -229,6 +249,10 @@ func (c *NamespaceCache) setNamespaceInfoFromK8sObject(ns *corev1.Namespace) {
 	if ok {
 		nsInfo.endpointURL = EndpointURL
 	}
+	RoleARN, ok := nsa[ackv1alpha1.AnnotationRoleARN]
+	if ok {
+		nsInfo.roleARN = RoleARN
+	}
 
 	nsInfo.deletionPolicies = map[string]string{}
 	nsDeletionPolicySuffix := "." + ackv1alpha1.AnnotationDeletionPolicy

pkg/runtime/cache/namespace_test.go

@@ -131,6 +131,101 @@ func TestNamespaceCache(t *testing.T) {
 	require.False(t, ok)
 }
 
+func TestNamespaceCacheWithRoleARN(t *testing.T) {
+	// create a fake k8s client and fake watcher
+	k8sClient := k8sfake.NewSimpleClientset()
+	watcher := watch.NewFake()
+	k8sClient.PrependWatchReactor("production", k8stesting.DefaultWatchReactor(watcher, nil))
+
+	// New logger writing to specific buffer
+	zapOptions := ctrlrtzap.Options{
+		Development: true,
+		Level:       zapcore.InfoLevel,
+	}
+	fakeLogger := ctrlrtzap.New(ctrlrtzap.UseFlagOptions(&zapOptions))
+
+	// initlizing account cache
+	namespaceCache := ackrtcache.NewNamespaceCache(fakeLogger, []string{}, []string{})
+	stopCh := make(chan struct{})
+
+	namespaceCache.Run(k8sClient, stopCh)
+
+	// Test create events
+	_, err := k8sClient.CoreV1().Namespaces().Create(
+		context.Background(),
+		&corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "production",
+				Annotations: map[string]string{
+					ackv1alpha1.AnnotationDefaultRegion: "us-west-2",
+					ackv1alpha1.AnnotationRoleARN:       "arn:aws:iam::123456789012:role/some-role",
+					ackv1alpha1.AnnotationEndpointURL:   "https://amazon-service.region.amazonaws.com",
+				},
+			},
+		},
+		metav1.CreateOptions{},
+	)
+	require.Nil(t, err)
+
+	time.Sleep(time.Second)
+
+	defaultRegion, ok := namespaceCache.GetDefaultRegion("production")
+	require.True(t, ok)
+	require.Equal(t, "us-west-2", defaultRegion)
+
+	roleARN, ok := namespaceCache.GetRoleARN("production")
+	require.True(t, ok)
+	require.Equal(t, "arn:aws:iam::123456789012:role/some-role", roleARN)
+
+	endpointURL, ok := namespaceCache.GetEndpointURL("production")
+	require.True(t, ok)
+	require.Equal(t, "https://amazon-service.region.amazonaws.com", endpointURL)
+
+	// Test update events
+	_, err = k8sClient.CoreV1().Namespaces().Update(
+		context.Background(),
+		&corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "production",
+				Annotations: map[string]string{
+					ackv1alpha1.AnnotationDefaultRegion: "us-est-1",
+					ackv1alpha1.AnnotationRoleARN:       "arn:aws:iam::223456789012:role/some-role",
+					ackv1alpha1.AnnotationEndpointURL:   "https://amazon-other-service.region.amazonaws.com",
+				},
+			},
+		},
+		metav1.UpdateOptions{},
+	)
+	require.Nil(t, err)
+
+	time.Sleep(time.Second)
+
+	defaultRegion, ok = namespaceCache.GetDefaultRegion("production")
+	require.True(t, ok)
+	require.Equal(t, "us-est-1", defaultRegion)
+
+	roleARN, ok = namespaceCache.GetRoleARN("production")
+	require.True(t, ok)
+	require.Equal(t, "arn:aws:iam::223456789012:role/some-role", roleARN)
+
+	endpointURL, ok = namespaceCache.GetEndpointURL("production")
+	require.True(t, ok)
+	require.Equal(t, "https://amazon-other-service.region.amazonaws.com", endpointURL)
+
+	// Test delete events
+	err = k8sClient.CoreV1().Namespaces().Delete(
+		context.Background(),
+		"production",
+		metav1.DeleteOptions{},
+	)
+	require.Nil(t, err)
+
+	time.Sleep(time.Second)
+
+	_, ok = namespaceCache.GetDefaultRegion(testNamespace1)
+	require.False(t, ok)
+}
+
 func TestScopedNamespaceCache(t *testing.T) {
 	defaultConfig := ackrtcache.Config{
 		WatchScope: []string{"watch-scope", "watch-scope-2"},

pkg/runtime/reconciler.go

@@ -20,6 +20,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/aws/aws-sdk-go/aws/arn"
 	backoff "github.com/cenkalti/backoff/v4"
 	"github.com/go-logr/logr"
 	"github.com/pkg/errors"
@@ -178,6 +179,17 @@ func (r *resourceReconciler) Reconcile(ctx context.Context, req ctrlrt.Request)
 			return ctrlrt.Result{}, requeue.NeededAfter(err, roleARNNotAvailableRequeueDelay)
 		}
 	}
+
+	roleARNFromAnnotation := r.getRoleARNFromAnnotation(desired)
+	if roleARNFromAnnotation != "" {
+		roleARN = roleARNFromAnnotation
+		parsedARN, err := arn.Parse(string(roleARNFromAnnotation))
+		if err != nil {
+			return ctrlrt.Result{}, fmt.Errorf("failed to parsed role ARN %q from namespace annotation: %v", roleARNFromAnnotation, err)
+		}
+		acctID = ackv1alpha1.AWSAccountID(parsedARN.AccountID)
+	}
+
 	region := r.getRegion(desired)
 
 	endpointURL := r.getEndpointURL(desired)
@@ -1025,6 +1037,18 @@ func (r *resourceReconciler) getOwnerAccountID(
 	return controllerAccountID, false
 }
 
+func (r *resourceReconciler) getRoleARNFromAnnotation(
+	res acktypes.AWSResource,
+) ackv1alpha1.AWSResourceName {
+	// look for role ARN in the namespace annotations
+	namespace := res.MetaObject().GetNamespace()
+	roleARN, ok := r.cache.Namespaces.GetRoleARN(namespace)
+	if ok {
+		return ackv1alpha1.AWSResourceName(roleARN)
+	}
+	return ""
+}
+
 // getRoleARN return the Role ARN that should be assumed in order to manage
 // the resources.
 func (r *resourceReconciler) getRoleARN(