UPSTREAM: <carry>: Add host assignment plugin for CRD-based routes.

Author: benluddy

openshift-kube-apiserver/admission/admissionenablement/register.go

@@ -18,12 +18,14 @@ import (
 	"k8s.io/kubernetes/openshift-kube-apiserver/admission/network/externalipranger"
 	"k8s.io/kubernetes/openshift-kube-apiserver/admission/network/restrictedendpoints"
 	ingressadmission "k8s.io/kubernetes/openshift-kube-apiserver/admission/route"
+	"k8s.io/kubernetes/openshift-kube-apiserver/admission/route/hostassignment"
 	projectnodeenv "k8s.io/kubernetes/openshift-kube-apiserver/admission/scheduler/nodeenv"
 	schedulerpodnodeconstraints "k8s.io/kubernetes/openshift-kube-apiserver/admission/scheduler/podnodeconstraints"
 )
 
 func RegisterOpenshiftKubeAdmissionPlugins(plugins *admission.Plugins) {
 	authorizationrestrictusers.Register(plugins)
+	hostassignment.Register(plugins)
 	imagepolicy.Register(plugins)
 	ingressadmission.Register(plugins)
 	managementcpusoverride.Register(plugins)
@@ -65,6 +67,7 @@ var (
 		"security.openshift.io/SecurityContextConstraint",
 		"security.openshift.io/SCCExecRestrictions",
 		"route.openshift.io/IngressAdmission",
+		hostassignment.PluginName, // "route.openshift.io/RouteHostAssignment"
 	}
 
 	// openshiftAdmissionPluginsForKubeAfterResourceQuota are the plugins to add after ResourceQuota plugin

openshift-kube-apiserver/admission/route/apis/hostassignment/doc.go

@@ -0,0 +1,4 @@
+// +k8s:deepcopy-gen=package,register
+
+// Package hostassignment is the internal version of the API.
+package hostassignment

openshift-kube-apiserver/admission/route/apis/hostassignment/register.go

@@ -0,0 +1,31 @@
+package hostassignment
+
+import (
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+// SchemeGroupVersion is group version used to register these objects
+var GroupVersion = schema.GroupVersion{Group: "route.openshift.io", Version: runtime.APIVersionInternal}
+
+// Kind takes an unqualified kind and returns back a Group qualified GroupKind
+func Kind(kind string) schema.GroupKind {
+	return GroupVersion.WithKind(kind).GroupKind()
+}
+
+// Resource takes an unqualified resource and returns back a Group qualified GroupResource
+func Resource(resource string) schema.GroupResource {
+	return GroupVersion.WithResource(resource).GroupResource()
+}
+
+var (
+	schemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
+	Install       = schemeBuilder.AddToScheme
+)
+
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(GroupVersion,
+		&HostAssignmentAdmissionConfig{},
+	)
+	return nil
+}

openshift-kube-apiserver/admission/route/apis/hostassignment/types.go

@@ -0,0 +1,17 @@
+package hostassignment
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// HostAssignmentAdmissionConfig is the configuration for the the route host assignment plugin.
+type HostAssignmentAdmissionConfig struct {
+	metav1.TypeMeta
+
+	// domain is used to generate a default host name for a route when the
+	// route's host name is empty. The generated host name will follow this
+	// pattern: "<route-name>.<route-namespace>.<domain>".
+	Domain string
+}

openshift-kube-apiserver/admission/route/apis/hostassignment/v1/doc.go

@@ -0,0 +1,5 @@
+// +k8s:deepcopy-gen=package,register
+// +k8s:conversion-gen=k8s.io/kubernetes/openshift-kube-apiserver/admission/route/apis/hostassignment
+
+// Package v1 is the v1 version of the API.
+package v1

openshift-kube-apiserver/admission/route/apis/hostassignment/v1/register.go

@@ -0,0 +1,64 @@
+/*
+Copyright The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1
+
+import (
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+// GroupName specifies the group name used to register the objects.
+const GroupName = "route.openshift.io"
+
+// GroupVersion specifies the group and the version used to register the objects.
+var GroupVersion = v1.GroupVersion{Group: GroupName, Version: "v1"}
+
+// SchemeGroupVersion is group version used to register these objects
+// Deprecated: use GroupVersion instead.
+var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: "v1"}
+
+// Resource takes an unqualified resource and returns a Group qualified GroupResource
+func Resource(resource string) schema.GroupResource {
+	return SchemeGroupVersion.WithResource(resource).GroupResource()
+}
+
+var (
+	// localSchemeBuilder and AddToScheme will stay in k8s.io/kubernetes.
+	SchemeBuilder      runtime.SchemeBuilder
+	localSchemeBuilder = &SchemeBuilder
+	// Depreciated: use Install instead
+	AddToScheme = localSchemeBuilder.AddToScheme
+	Install     = localSchemeBuilder.AddToScheme
+)
+
+func init() {
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&HostAssignmentAdmissionConfig{},
+	)
+	// AddToGroupVersion allows the serialization of client types like ListOptions.
+	v1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
+}

openshift-kube-apiserver/admission/route/apis/hostassignment/v1/types.go

@@ -0,0 +1,17 @@
+package v1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// HostAssignmentAdmissionConfig is the configuration for the the route host assignment plugin.
+type HostAssignmentAdmissionConfig struct {
+	metav1.TypeMeta `json:",inline"`
+
+	// domain is used to generate a default host name for a route when the
+	// route's host name is empty. The generated host name will follow this
+	// pattern: "<route-name>.<route-namespace>.<domain>".
+	Domain string `json:"domain"`
+}