feat: adds a validation hook

api/variables/variables.go

@@ -0,0 +1,33 @@
+// Copyright 2023 D2iQ, Inc. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package variables
+
+import (
+	"encoding/json"
+	"fmt"
+
+	runtimehooksv1 "sigs.k8s.io/cluster-api/exp/runtime/hooks/api/v1alpha1"
+)
+
+func UnmarshalRuntimeVariable[T any](runtimeVariable *runtimehooksv1.Variable, obj *T) error {
+	err := json.Unmarshal(runtimeVariable.Value.Raw, obj)
+	if err != nil {
+		return fmt.Errorf("error unmarshalling variable: %w", err)
+	}
+
+	return nil
+}
+
+//nolint:gocritic // no need for named results
+func GetRuntimhookVariableByName(
+	name string,
+	variables []runtimehooksv1.Variable,
+) (*runtimehooksv1.Variable, int) {
+	for i, runtimevar := range variables {
+		if runtimevar.Name == name {
+			return &runtimevar, i
+		}
+	}
+	return nil, -1
+}

cmd/main.go

@@ -34,6 +34,7 @@ import (
 	dockermutation "github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/docker/mutation"
 	dockerworkerconfig "github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/docker/workerconfig"
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/generic/lifecycle"
+	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/generic/validation"
 	nutanixclusterconfig "github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/nutanix/clusterconfig"
 	nutanixmutation "github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/nutanix/mutation"
 	nutanixworkerconfig "github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/nutanix/workerconfig"
@@ -84,6 +85,7 @@ func main() {
 
 	genericLifecycleHandlers := lifecycle.New(globalOptions)
 
+	validationHandlers := validation.New()
 	// Initialize and parse command line flags.
 	logs.AddFlags(pflag.CommandLine, logs.SkipLoggingConfigurationFlags())
 	logsv1.AddFlags(logOptions, pflag.CommandLine)
@@ -142,6 +144,7 @@ func main() {
 	}
 
 	var allHandlers []handlers.Named
+	allHandlers = append(allHandlers, validationHandlers.AllHandlers(mgr)...)
 	allHandlers = append(allHandlers, genericLifecycleHandlers.AllHandlers(mgr)...)
 	allHandlers = append(allHandlers, awsMetaHandlers...)
 	allHandlers = append(allHandlers, dockerMetaHandlers...)

pkg/handlers/generic/validation/handlers.go

@@ -0,0 +1,24 @@
+// Copyright 2023 D2iQ, Inc. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package validation
+
+import (
+	"sigs.k8s.io/controller-runtime/pkg/manager"
+
+	"github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix/common/pkg/capi/clustertopology/handlers"
+	"github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix/pkg/handlers/generic/validation/helm"
+)
+
+type Handlers struct{}
+
+func New() *Handlers {
+	return &Handlers{}
+}
+
+func (h *Handlers) AllHandlers(mgr manager.Manager) []handlers.Named {
+	validationHandler := helm.New(mgr.GetClient())
+	return []handlers.Named{
+		validationHandler,
+	}
+}

pkg/handlers/generic/validation/helm/handler.go

@@ -0,0 +1,87 @@
+// Copyright 2023 D2iQ, Inc. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package helm
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net/http"
+
+	runtimehooksv1 "sigs.k8s.io/cluster-api/exp/runtime/hooks/api/v1alpha1"
+	ctrl "sigs.k8s.io/controller-runtime"
+	ctrlclient "sigs.k8s.io/controller-runtime/pkg/client"
+
+	"github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix/api/v1alpha1"
+	"github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix/api/variables"
+	"github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix/pkg/handlers/generic/clusterconfig"
+)
+
+type HelmRegistryValidator struct {
+	client       ctrlclient.Client
+	variableName string
+}
+
+func New(
+	c ctrlclient.Client,
+) *HelmRegistryValidator {
+	return &HelmRegistryValidator{
+		client:       c,
+		variableName: clusterconfig.MetaVariableName,
+	}
+}
+
+func (h *HelmRegistryValidator) Name() string {
+	return "HelmRegistryValidator"
+}
+
+func (h *HelmRegistryValidator) ValidateTopology(
+	ctx context.Context,
+	req *runtimehooksv1.ValidateTopologyRequest,
+	res *runtimehooksv1.ValidateTopologyResponse,
+) {
+	log := ctrl.LoggerFrom(ctx)
+	clusterVar, ind := variables.GetRuntimhookVariableByName(h.variableName, req.Variables)
+	if ind == -1 {
+		log.V(5).Info(fmt.Sprintf("did not find variable %s in %v", h.variableName, req.Variables))
+		return
+	}
+	var cluster v1alpha1.ClusterConfig
+	if err := variables.UnmarshalRuntimeVariable[v1alpha1.ClusterConfig](clusterVar, &cluster); err != nil {
+		failString := fmt.Sprintf("failed  to unmarshal variable %v to clusterConfig", clusterVar)
+		log.Error(err, failString)
+		res.SetStatus(runtimehooksv1.ResponseStatusFailure)
+		res.SetMessage(failString)
+		return
+	}
+	helmChartRepo := cluster.Spec.Addons.HelmChartRepository
+	cl := &http.Client{
+		Transport: &http.Transport{
+			//nolint:gosec // this is done because customers can occasionally have self signed
+			// or no certificates to OCI registries
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		},
+	}
+	resp, err := cl.Get(fmt.Sprintf("%s/v2", *helmChartRepo))
+	if err != nil {
+		failString := fmt.Sprintf("failed to ping provided helm registry %s", *helmChartRepo)
+		log.Error(err, failString)
+		res.SetStatus(runtimehooksv1.ResponseStatusFailure)
+		res.SetMessage(failString)
+		return
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusUnauthorized {
+		res.SetStatus(runtimehooksv1.ResponseStatusSuccess)
+		return
+	}
+	failString := fmt.Sprintf(
+		"failed to get 401 or 200 response from hitting registry: %s got status: %d",
+		*helmChartRepo,
+		resp.StatusCode,
+	)
+	log.Error(err, failString)
+	res.SetStatus(runtimehooksv1.ResponseStatusFailure)
+	res.SetMessage(failString)
+}