Add cluster topology metadata validatino

api/v1beta1/common_types.go

@@ -18,7 +18,10 @@ package v1beta1
 
 import (
 	corev1 "k8s.io/api/core/v1"
+	apivalidation "k8s.io/apimachinery/pkg/api/validation"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	metav1validation "k8s.io/apimachinery/pkg/apis/meta/v1/validation"
+	"k8s.io/apimachinery/pkg/util/validation/field"
 )
 
 const (
@@ -297,3 +300,16 @@ type ObjectMeta struct {
 	// +optional
 	Annotations map[string]string `json:"annotations,omitempty"`
 }
+
+// Validate validates the labels and annotations in ObjectMeta.
+func (metadata *ObjectMeta) Validate(parent *field.Path) field.ErrorList {
+	allErrs := metav1validation.ValidateLabels(
+		metadata.Labels,
+		parent.Child("labels"),
+	)
+	allErrs = append(allErrs, apivalidation.ValidateAnnotations(
+		metadata.Annotations,
+		parent.Child("annotations"),
+	)...)
+	return allErrs
+}

internal/webhooks/cluster.go

@@ -255,6 +255,9 @@ func (webhook *Cluster) validateTopology(ctx context.Context, oldCluster, newClu
 		)
 	}
 
+	// metadata in topology should be valid
+	allErrs = append(allErrs, validateTopologyMetadata(newCluster.Spec.Topology, fldPath)...)
+
 	// upgrade concurrency should be a numeric value.
 	if concurrency, ok := newCluster.Annotations[clusterv1.ClusterTopologyUpgradeConcurrencyAnnotation]; ok {
 		concurrencyAnnotationField := field.NewPath("metadata", "annotations", clusterv1.ClusterTopologyUpgradeConcurrencyAnnotation)
@@ -629,3 +632,16 @@ func clusterClassIsReconciled(clusterClass *clusterv1.ClusterClass) error {
 	}
 	return nil
 }
+
+func validateTopologyMetadata(topology *clusterv1.Topology, fldPath *field.Path) field.ErrorList {
+	var allErrs field.ErrorList
+	allErrs = append(allErrs, topology.ControlPlane.Metadata.Validate(fldPath.Child("controlPlane", "metadata"))...)
+	if topology.Workers != nil {
+		for idx, md := range topology.Workers.MachineDeployments {
+			allErrs = append(allErrs, md.Metadata.Validate(
+				fldPath.Child("workers", "machineDeployments").Index(idx).Child("metadata"),
+			)...)
+		}
+	}
+	return allErrs
+}