Add webhook rule checker

Signed-off-by: Per Goncalves da Silva <pegoncal@redhat.com>

Author: Per Goncalves da Silva

internal/operator-controller/rukpak/render/registryv1/validators/validator.go

@@ -264,3 +264,50 @@ func CheckWebhookNameIsDNS1123SubDomain(rv1 *bundle.RegistryV1) []error {
 	}
 	return errs
 }
+
+// unsupportedWebhookRuleAPIGroups contain the API groups that are unsupported for webhook configuration rules in OLMv1
+var unsupportedWebhookRuleAPIGroups = []string{
+	"operators.coreos.com",
+	"*",
+}
+
+// unsupportedAdmissionRegistrationResources contain the resources that are unsupported for webhook configuration rules
+// for the admissionregistration.k8s.io api group
+var unsupportedAdmissionRegistrationResources = []string{
+	"*",
+	"mutatingwebhookconfiguration",
+	"mutatingwebhookconfigurations",
+	"validatingwebhookconfiguration",
+	"validatingwebhookconfigurations",
+}
+
+// CheckWebhookRules ensures webhook rules do not reference unsupported API groups or resources in line with OLMv0 behavior
+// See https://github.com/operator-framework/operator-lifecycle-manager/blob/ccf0c4c91f1e7673e87f3a18947f9a1f88d48438/pkg/controller/install/webhook.go#L19
+// for more details
+func CheckWebhookRules(rv1 *bundle.RegistryV1) []error {
+	var errs []error
+	for _, wh := range rv1.CSV.Spec.WebhookDefinitions {
+		// Rules are not used for conversion webhooks
+		if wh.Type == v1alpha1.ConversionWebhook {
+			continue
+		}
+		webhookName := wh.GenerateName
+		for _, rule := range wh.Rules {
+			for _, apiGroup := range rule.APIGroups {
+				if slices.Contains(unsupportedWebhookRuleAPIGroups, apiGroup) {
+					errs = append(errs, fmt.Errorf("webhook %q contains unsupported rule: unsupported API group %q", webhookName, apiGroup))
+				}
+				if apiGroup == "admissionregistration.k8s.io" {
+					for _, resource := range rule.Resources {
+						if slices.Contains(unsupportedAdmissionRegistrationResources, strings.ToLower(resource)) {
+							errs = append(errs, fmt.Errorf("webhook %q contains unsupported rule: unsupported resource %q for API group %q", webhookName, resource, apiGroup))
+						}
+					}
+				}
+			}
+		}
+	}
+	return slices.SortedFunc(slices.Values(errs), func(err1 error, err2 error) int {
+		return cmp.Compare(err1.Error(), err2.Error())
+	})
+}