Add configuration file assets and required functions

Dockerfile

@@ -20,6 +20,7 @@ COPY cmd/main.go cmd/main.go
 COPY api/ api/
 COPY pkg/controllers/ pkg/controllers/
 COPY pkg/cert/ pkg/cert/
+COPY pkg/config/ pkg/config/
 COPY pkg/webhooks/ pkg/webhooks/
 COPY pkg/utils pkg/utils
 

PROJECT

@@ -21,4 +21,12 @@ resources:
     defaulting: true
     validation: true
     webhookVersion: v1
+- api:
+    crdVersion: v1
+    namespaced: true
+  domain: lws.x-k8s.io
+  group: lws
+  kind: Configuration
+  path: sigs.k8s.io/lws/api/config/v1alpha1
+  version: v1alpha1
 version: "3"

api/config/v1alpha1/configuration_types.go

@@ -0,0 +1,130 @@
+/*
+Copyright 2025 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 v1alpha1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	configv1alpha1 "k8s.io/component-base/config/v1alpha1"
+)
+
+// +k8s:defaulter-gen=true
+// +kubebuilder:object:root=true
+
+// Configuration is the Schema for the configurations API
+type Configuration struct {
+	metav1.TypeMeta `json:",inline"`
+
+	// ControllerManager returns the configurations for controllers
+	ControllerManager `json:",inline"`
+
+	// InternalCertManagerment is configuration for internalCertManagerment
+	InternalCertManagement *InternalCertManagement `json:"internalCertManagement,omitempty"`
+
+	// ClientConnection is configuration of the client while connecting to API Server
+	ClientConnection *ClientConnection `json:"clientConnection,omitempty"`
+}
+
+type ControllerManager struct {
+	// Webhook contains the controllers webhook configuration
+	// +optional
+	Webhook ControllerWebhook `json:"webhook,omitempty"`
+
+	// LeaderElection is the LeaderElection config to be used when configuring
+	// the manager.Manager leader election
+	// +optional
+	LeaderElection *configv1alpha1.LeaderElectionConfiguration `json:"leaderElection,omitempty"`
+
+	// Metrics contains the controller metrics configuration
+	// +optional
+	Metrics ControllerMetrics `json:"metrics,omitempty"`
+
+	// Health contains the controller health configuration
+	// +optional
+	Health ControllerHealth `json:"health,omitempty"`
+}
+
+// ControllerWebhook defines the webhook server for the controller.
+type ControllerWebhook struct {
+	// Port is the port that the webhook server serves at.
+	// It is used to set webhook.Server.Port.
+	// +optional
+	Port *int `json:"port,omitempty"`
+
+	// Host is the hostname that the webhook server binds to.
+	// It is used to set webhook.Server.Host.
+	// +optional
+	Host string `json:"host,omitempty"`
+
+	// CertDir is the directory that contains the server key and certificate.
+	// if not set, webhook server would look up the server key and certificate in
+	// {TempDir}/k8s-webhook-server/serving-certs. The server key and certificate
+	// must be named tls.key and tls.crt, respectively.
+	// +optional
+	CertDir string `json:"certDir,omitempty"`
+}
+
+// ControllerMetrics defines the metrics configs.
+type ControllerMetrics struct {
+	// BindAddress is the TCP address that the controller should bind to
+	// for serving prometheus metrics.
+	// It can be set to "0" to disable the metrics serving.
+	// +optional
+	BindAddress string `json:"bindAddress,omitempty"`
+}
+
+// ControllerHealth defines the health configs.
+type ControllerHealth struct {
+	// HealthProbeBindAddress is the TCP address that the controller should bind to
+	// for serving health probes
+	// It can be set to "0" or "" to disable serving the health probe.
+	// +optional
+	HealthProbeBindAddress string `json:"healthProbeBindAddress,omitempty"`
+
+	// ReadinessEndpointName, defaults to "readyz"
+	// +optional
+	ReadinessEndpointName string `json:"readinessEndpointName,omitempty"`
+
+	// LivenessEndpointName, defaults to "healthz"
+	// +optional
+	LivenessEndpointName string `json:"livenessEndpointName,omitempty"`
+}
+
+// InternalCertManagement defines internal certificate management configs
+type InternalCertManagement struct {
+	// Enable controls whether to enable internal cert management or not.
+	// Defaults to true. If you want to use a third-party management, e.g. cert-manager,
+	// set it to false. See the user guide for more information.
+	Enable *bool `json:"enable,omitempty"`
+
+	// WebhookServiceName is the name of the Service used as part of the DNSName.
+	// Defaults to lws-webhook-service.
+	WebhookServiceName *string `json:"webhookServiceName,omitempty"`
+
+	// WebhookSecretName is the name of the Secret used to store CA and server certs.
+	// Defaults to lws-webhook-server-cert.
+	WebhookSecretName *string `json:"webhookSecretName,omitempty"`
+}
+
+// ClientConnection defines the connection related fields while connecting to API Server
+type ClientConnection struct {
+	// QPS controls the number of queries per second allowed for K8S api server
+	// connection.
+	QPS *float32 `json:"qps,omitempty"`
+
+	// Burst allows extra queries to accumulate when a client is exceeding its rate.
+	Burst *int32 `json:"burst,omitempty"`
+}

api/config/v1alpha1/defaults.go

@@ -0,0 +1,90 @@
+/*
+Copyright 2025 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 v1alpha1
+
+import (
+	"time"
+
+	configv1alpha1 "k8s.io/component-base/config/v1alpha1"
+	"k8s.io/utils/ptr"
+)
+
+const (
+	DefaultWebhookServiceName                  = "lws-webhook-service"
+	DefaultWebhookSecretName                   = "lws-webhook-server-cert"
+	DefaultWebhookPort                         = 9443
+	DefaultHealthProbeBindAddress              = ":8081"
+	DefaultMetricsBindAddress                  = ":8443"
+	DefaultLeaderElectionID                    = "b8b2488c.x-k8s.io"
+	DefaultLeaderElectionLeaseDuration         = 15 * time.Second
+	DefaultLeaderElectionRenewDeadline         = 10 * time.Second
+	DefaultLeaderElectionRetryPeriod           = 2 * time.Second
+	DefaultResourceLock                        = "leases"
+	DefaultClientConnectionQPS         float32 = 500
+	DefaultClientConnectionBurst       int32   = 500
+)
+
+// SetDefaults_Configuration sets default values for ComponentConfig.
+//
+//nolint:revive // format required by generated code for defaulting
+func SetDefaults_Configuration(cfg *Configuration) {
+	if cfg.Webhook.Port == nil {
+		cfg.Webhook.Port = ptr.To(DefaultWebhookPort)
+	}
+	if len(cfg.Metrics.BindAddress) == 0 {
+		cfg.Metrics.BindAddress = DefaultMetricsBindAddress
+	}
+	if len(cfg.Health.HealthProbeBindAddress) == 0 {
+		cfg.Health.HealthProbeBindAddress = DefaultHealthProbeBindAddress
+	}
+
+	if cfg.LeaderElection == nil {
+		cfg.LeaderElection = &configv1alpha1.LeaderElectionConfiguration{}
+	}
+	if len(cfg.LeaderElection.ResourceName) == 0 {
+		cfg.LeaderElection.ResourceName = DefaultLeaderElectionID
+	}
+	if len(cfg.LeaderElection.ResourceLock) == 0 {
+		cfg.LeaderElection.ResourceLock = DefaultResourceLock
+	}
+	// Use the default LeaderElectionConfiguration options
+	configv1alpha1.RecommendedDefaultLeaderElectionConfiguration(cfg.LeaderElection)
+
+	if cfg.InternalCertManagement == nil {
+		cfg.InternalCertManagement = &InternalCertManagement{}
+	}
+	if cfg.InternalCertManagement.Enable == nil {
+		cfg.InternalCertManagement.Enable = ptr.To(true)
+	}
+	if *cfg.InternalCertManagement.Enable {
+		if cfg.InternalCertManagement.WebhookServiceName == nil {
+			cfg.InternalCertManagement.WebhookServiceName = ptr.To(DefaultWebhookServiceName)
+		}
+		if cfg.InternalCertManagement.WebhookSecretName == nil {
+			cfg.InternalCertManagement.WebhookSecretName = ptr.To(DefaultWebhookSecretName)
+		}
+	}
+	if cfg.ClientConnection == nil {
+		cfg.ClientConnection = &ClientConnection{}
+	}
+	if cfg.ClientConnection.QPS == nil {
+		cfg.ClientConnection.QPS = ptr.To(DefaultClientConnectionQPS)
+	}
+	if cfg.ClientConnection.Burst == nil {
+		cfg.ClientConnection.Burst = ptr.To(DefaultClientConnectionBurst)
+	}
+}