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kwite_webhook.go
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kwite_webhook.go
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/*
kwite_webhook.go
Copyright (c) 2019-2020 VMware, Inc.
SPDX-License-Identifier: https://spdx.org/licenses/MIT.html
*/
package v1beta1
import (
"text/template"
"github.com/tdhite/kwite/pkg/funcs"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
validationutils "k8s.io/apimachinery/pkg/util/validation"
"k8s.io/apimachinery/pkg/util/validation/field"
ctrl "sigs.k8s.io/controller-runtime"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
"sigs.k8s.io/controller-runtime/pkg/webhook"
)
// log is for logging in this package.
var kwitelog = logf.Log.WithName("kwite-resource")
func (r *Kwite) SetupWebhookWithManager(mgr ctrl.Manager) error {
return ctrl.NewWebhookManagedBy(mgr).
For(r).
Complete()
}
// +kubebuilder:webhook:path=/mutate-web-kwite-site-v1beta1-kwite,mutating=true,failurePolicy=fail,groups=web.kwite.site,resources=kwites,verbs=create;update,versions=v1beta1,name=mkwite.kb.io
var _ webhook.Defaulter = &Kwite{}
// Default implements webhook.Defaulter so a webhook will be registered for the type
func (r *Kwite) Default() {
kwitelog.Info("default", "name", r.Name)
if r.Spec.Url == "" {
r.Spec.Url = "/"
}
if r.Spec.Image == "" {
r.Spec.Image = "kwite:latest"
}
if r.Spec.Port == 0 {
r.Spec.Port = 8080
}
if r.Spec.MaxReplicas <= 0 {
r.Spec.MaxReplicas = 1
}
if r.Spec.MinReplicas <= 0 {
r.Spec.MinReplicas = 0
}
if r.Spec.Public == nil {
r.Spec.Public = new(bool)
}
if r.Spec.Memory == "" {
r.Spec.Memory = "64Mi"
}
if r.Spec.CPU == "" {
r.Spec.CPU = "200m"
}
if r.Spec.TargetCpu == 0 {
r.Spec.TargetCpu = 80
}
if r.Spec.SecurityContext == nil {
nonRoot := true
readOnly := true
allowEscalate := false
var user int64 = 65534
r.Spec.SecurityContext = &corev1.SecurityContext{
RunAsNonRoot: &nonRoot,
ReadOnlyRootFilesystem: &readOnly,
AllowPrivilegeEscalation: &allowEscalate,
RunAsUser: &user,
}
}
}
// +kubebuilder:webhook:verbs=create;update,path=/validate-web-kwite-site-v1beta1-kwite,mutating=false,failurePolicy=fail,groups=web.kwite.site,resources=kwites,versions=v1beta1,name=vkwite.kb.io
var _ webhook.Validator = &Kwite{}
// ValidateCreate implements webhook.Validator so a webhook will be registered for the type
func (r *Kwite) ValidateCreate() error {
kwitelog.Info("validate create", "name", r.Name)
return r.validateKwite()
}
// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type
func (r *Kwite) ValidateUpdate(old runtime.Object) error {
kwitelog.Info("validate update", "name", r.Name)
return r.validateKwite()
}
// ValidateDelete implements webhook.Validator so a webhook will be registered for the type
func (r *Kwite) ValidateDelete() error {
kwitelog.Info("validate delete", "name", r.Name)
return nil
}
// Validate the kwite object
func (r *Kwite) validateKwite() error {
var allErrs field.ErrorList
allErrs = r.validateKwiteName(allErrs)
allErrs = r.validateKwiteSpec(allErrs)
if len(allErrs) == 0 {
return nil
}
return apierrors.NewInvalid(
schema.GroupKind{Group: "web.kwite.site", Kind: "Kwite"},
r.Name, allErrs)
}
// Validate that the Kwite name conforms to the rules on object fields
func (r *Kwite) validateKwiteName(allErrs field.ErrorList) field.ErrorList {
if len(r.ObjectMeta.Name) > validationutils.DNS1035LabelMaxLength {
// The kwite name length is 63 character like all Kubernetes objects
// (which must fit in a DNS subdomain).
fe := field.Invalid(field.NewPath("metadata").Child("name"), r.Name, "must be no more than 63 characters")
allErrs = append(allErrs, fe)
}
return allErrs
}
// Validate the Kwite Spec object
func (r *Kwite) validateKwiteSpec(allErrs field.ErrorList) field.ErrorList {
// The field helpers from the kubernetes API machinery help us return nicely
// structured validation errors.
fldPath := field.NewPath("spec")
if fe := r.validateQuantity(fldPath, "CPU", r.Spec.CPU); fe != nil {
allErrs = append(allErrs, fe)
}
if fe := r.validateQuantity(fldPath, "Memory", r.Spec.Memory); fe != nil {
allErrs = append(allErrs, fe)
}
if fe := r.validateTemplate(fldPath, "template", &r.Spec.Template); fe != nil {
allErrs = append(allErrs, fe)
}
if fe := r.validateTemplate(fldPath, "ready", &r.Spec.Ready); fe != nil {
allErrs = append(allErrs, fe)
}
if fe := r.validateTemplate(fldPath, "alive", &r.Spec.Alive); fe != nil {
allErrs = append(allErrs, fe)
}
return allErrs
}
// Validate that the quantity conforms to the rules on Kubernetes quantities.
func (r *Kwite) validateQuantity(fldPath *field.Path, name, value interface{}) *field.Error {
if _, err := resource.ParseQuantity(value.(string)); err != nil {
return field.Invalid(fldPath, value, err.Error())
}
return nil
}
// Validate that the Template within the Spec parses successfully
func (r *Kwite) validateTemplate(fldPath *field.Path, name string, t *string) *field.Error {
_, err := template.New(name).Funcs(funcs.TextTemplateFuncs()).Parse(string(*t))
if err != nil {
return field.Invalid(fldPath.Child(name), r.Name, err.Error())
}
return nil
}