Use kubebuilder items markers

The issue kubernetes-sigs/controller-tools#342
was fixed and CRD generator now supports validation markers for array items.

This change uses items markers and removes hack used to add
max length and pattern constraints to hosts.

Signed-off-by: Alexander Yastrebov <alexander.yastrebov@zalando.de>

Makefile

@@ -31,10 +31,7 @@ $(GENERATED): $(CRD_TYPE_SOURCE)
 	bash -x ./hack/update-codegen.sh
 
 $(GENERATED_CRD): go.mod $(GENERATED)
-	go run sigs.k8s.io/controller-tools/cmd/controller-gen@v0.14.0 crd:crdVersions=v1 paths=./apis/... output:crd:dir=.
-	# workaround to add validation to array items. Not supported by controller-gen
-	# ref: https://github.com/kubernetes-sigs/controller-tools/issues/342
-	go run hack/crd/add_hosts_validation.go $(GENERATED_CRD)
+	go run sigs.k8s.io/controller-tools/cmd/controller-gen@master crd:crdVersions=v1 paths=./apis/... output:crd:dir=.
 
 build.local: $(LOCAL_BINARIES) $(GENERATED_CRD)
 build.linux: $(LINUX_BINARIES) $(GENERATED_CRD)

apis/zalando.org/v1/types.go

@@ -43,6 +43,8 @@ type RouteGroupList struct {
 type RouteGroupSpec struct {
 	// List of hostnames for the RouteGroup
 	// +kubebuilder:validation:MinItems=1
+	// +kubebuilder:validation:items:MaxLength=255
+	// +kubebuilder:validation:items:Pattern="^[a-z0-9]([-a-z0-9]*[a-z0-9])?([.][a-z0-9]([-a-z0-9]*[a-z0-9])?)*$"
 	// +listType=set
 	Hosts []string `json:"hosts,omitempty"`
 	// List of backends that can be referenced in the routes
@@ -180,6 +182,8 @@ type RouteGroupTLSSpec struct {
 	// The values in this list must match the host name(s) used for
 	// the RouteGroup in order to terminate TLS for the host(s).
 	// +kubebuilder:validation:MinItems=1
+	// +kubebuilder:validation:items:MaxLength=255
+	// +kubebuilder:validation:items:Pattern="^[a-z0-9]([-a-z0-9]*[a-z0-9])?([.][a-z0-9]([-a-z0-9]*[a-z0-9])?)*$"
 	// +listType=set
 	Hosts []string `json:"hosts"`
 

zalando.org_routegroups.yaml

@@ -1,8 +1,9 @@
+---
 apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.14.0
+    controller-gen.kubebuilder.io/version: v0.14.1-0.20240403150007-6bbabbc0dad8
   name: routegroups.zalando.org
 spec:
   group: zalando.org