refactor: add auth interface and unit tests (#4518)

Signed-off-by: Charles-Edouard Brétéché <charled.breteche@gmail.com>

Signed-off-by: Charles-Edouard Brétéché <charled.breteche@gmail.com>

pkg/auth/auth.go

@@ -11,7 +11,17 @@ import (
 )
 
 // CanIOptions provides utility to check if user has authorization for the given operation
-type CanIOptions struct {
+type CanIOptions interface {
+	// RunAccessCheck checks if the caller can perform the operation
+	// - operation is a combination of namespace, kind, verb
+	// - can only evaluate a single verb
+	// - group version resource is determined from the kind using the discovery client REST mapper
+	// - If disallowed, the reason and evaluationError is available in the logs
+	// - each can generates a SelfSubjectAccessReview resource and response is evaluated for permissions
+	RunAccessCheck() (bool, error)
+}
+
+type canIOptions struct {
 	namespace string
 	verb      string
 	kind      string
@@ -19,8 +29,8 @@ type CanIOptions struct {
 }
 
 // NewCanI returns a new instance of operation access controller evaluator
-func NewCanI(client dclient.Interface, kind, namespace, verb string) *CanIOptions {
-	return &CanIOptions{
+func NewCanI(client dclient.Interface, kind, namespace, verb string) CanIOptions {
+	return &canIOptions{
 		namespace: namespace,
 		kind:      kind,
 		verb:      verb,
@@ -34,7 +44,7 @@ func NewCanI(client dclient.Interface, kind, namespace, verb string) *CanIOption
 // - group version resource is determined from the kind using the discovery client REST mapper
 // - If disallowed, the reason and evaluationError is available in the logs
 // - each can generates a SelfSubjectAccessReview resource and response is evaluated for permissions
-func (o *CanIOptions) RunAccessCheck() (bool, error) {
+func (o *canIOptions) RunAccessCheck() (bool, error) {
 	// get GroupVersionResource from RESTMapper
 	// get GVR from kind
 	gvr, err := o.client.Discovery().GetGVRFromKind(o.kind)

pkg/auth/auth_test.go

@@ -1,48 +1,92 @@
 package auth
 
-// import (
-// 	"testing"
-// 	"time"
+import (
+	"testing"
 
-// 	"github.com/golang/glog"
-// 	"github.com/kyverno/kyverno/pkg/config"
-// 	dclient "github.com/kyverno/kyverno/pkg/clients/dclient"
-// 	"github.com/kyverno/kyverno/pkg/signal"
-// )
+	"github.com/kyverno/kyverno/pkg/clients/dclient"
+	"github.com/stretchr/testify/assert"
+)
 
-// func Test_Auth_pass(t *testing.T) {
-// 	// needs running cluster
-// 	var kubeconfig string
-// 	stopCh := signal.SetupSignalHandler()
-// 	kubeconfig = "/Users/shivd/.kube/config"
-// 	clientConfig, err := config.CreateClientConfig(kubeconfig)
-// 	if err != nil {
-// 		glog.Fatalf("Error building kubeconfig: %v\n", err)
-// 	}
+func TestNewCanI(t *testing.T) {
+	type args struct {
+		client    dclient.Interface
+		kind      string
+		namespace string
+		verb      string
+	}
+	tests := []struct {
+		name string
+		args args
+	}{{
+		name: "deployments",
+		args: args{
+			client:    dclient.NewEmptyFakeClient(),
+			kind:      "Deployment",
+			namespace: "default",
+			verb:      "test",
+		},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := NewCanI(tt.args.client, tt.args.kind, tt.args.namespace, tt.args.verb)
+			assert.NotNil(t, got)
+		})
+	}
+}
 
-// 	// DYNAMIC CLIENT
-// 	// - client for all registered resources
-// 	// - invalidate local cache of registered resource every 10 seconds
-// 	client, err := dclient.NewClient(clientConfig, 10*time.Second, stopCh)
-// 	if err != nil {
-// 		glog.Fatalf("Error creating client: %v\n", err)
-// 	}
-
-// 	// Can i authenticate
-
-// 	kind := "Deployment"
-// 	namespace := "default"
-// 	verb := "test"
-// 	canI := NewCanI(client, kind, namespace, verb)
-// 	ok, err := canI.RunAccessCheck()
-// 	if err != nil {
-// 		t.Error(err)
-// 	}
-// 	if ok {
-// 		t.Log("allowed")
-// 	} else {
-// 		t.Log("notallowed")
-// 	}
-// 	t.FailNow()
-
-// }
+func TestCanIOptions_RunAccessCheck(t *testing.T) {
+	type fields struct {
+		namespace string
+		verb      string
+		kind      string
+		client    dclient.Interface
+	}
+	tests := []struct {
+		name    string
+		fields  fields
+		want    bool
+		wantErr bool
+	}{{
+		name: "deployments",
+		fields: fields{
+			client:    dclient.NewEmptyFakeClient(),
+			kind:      "Deployment",
+			namespace: "default",
+			verb:      "test",
+		},
+		want:    false,
+		wantErr: false,
+	}, {
+		name: "unknown",
+		fields: fields{
+			client:    dclient.NewEmptyFakeClient(),
+			kind:      "Unknown",
+			namespace: "default",
+			verb:      "test",
+		},
+		want:    false,
+		wantErr: true,
+	}, {
+		name: "v2 pods",
+		fields: fields{
+			client:    dclient.NewEmptyFakeClient(),
+			kind:      "v2/Pod",
+			namespace: "default",
+			verb:      "test",
+		},
+		want:    false,
+		wantErr: true,
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := NewCanI(tt.fields.client, tt.fields.kind, tt.fields.namespace, tt.fields.verb)
+			got, err := o.RunAccessCheck()
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, tt.want, got)
+			}
+		})
+	}
+}

pkg/clients/dclient/fake.go

@@ -31,8 +31,9 @@ func NewEmptyFakeClient() Interface {
 	scheme := runtime.NewScheme()
 
 	return &client{
-		client:  fake.NewSimpleDynamicClientWithCustomListKinds(scheme, gvrToListKind, objects...),
-		kclient: kubefake.NewSimpleClientset(objects...),
+		client:          fake.NewSimpleDynamicClientWithCustomListKinds(scheme, gvrToListKind, objects...),
+		kclient:         kubefake.NewSimpleClientset(objects...),
+		discoveryClient: NewFakeDiscoveryClient(nil),
 	}
 }