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webhooks.go
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webhooks.go
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package webhooks
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
admissionv1 "k8s.io/api/admission/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
v12 "kubevirt.io/client-go/api/v1"
"kubevirt.io/client-go/log"
"kubevirt.io/kubevirt/pkg/virt-api/webhooks"
)
// GetAdmissionReview
func GetAdmissionReview(r *http.Request) (*admissionv1.AdmissionReview, error) {
var body []byte
if r.Body != nil {
if data, err := ioutil.ReadAll(r.Body); err == nil {
body = data
}
}
// verify the content type is accurate
contentType := r.Header.Get("Content-Type")
if contentType != "application/json" {
return nil, fmt.Errorf("contentType=%s, expect application/json", contentType)
}
ar := &admissionv1.AdmissionReview{}
err := json.Unmarshal(body, ar)
return ar, err
}
// ToAdmissionResponseError
func ToAdmissionResponseError(err error) *admissionv1.AdmissionResponse {
log.Log.Reason(err).Error("admission generic error")
return &admissionv1.AdmissionResponse{
Result: &v1.Status{
Message: err.Error(),
Code: http.StatusBadRequest,
},
}
}
func ToAdmissionResponse(causes []v1.StatusCause) *admissionv1.AdmissionResponse {
log.Log.Infof("rejected vmi admission")
globalMessage := ""
for _, cause := range causes {
if globalMessage == "" {
globalMessage = cause.Message
} else {
globalMessage = fmt.Sprintf("%s, %s", globalMessage, cause.Message)
}
}
return &admissionv1.AdmissionResponse{
Result: &v1.Status{
Message: globalMessage,
Reason: v1.StatusReasonInvalid,
Code: http.StatusUnprocessableEntity,
Details: &v1.StatusDetails{
Causes: causes,
},
},
}
}
func ValidationErrorsToAdmissionResponse(errs []error) *admissionv1.AdmissionResponse {
var causes []v1.StatusCause
for _, e := range errs {
causes = append(causes,
v1.StatusCause{
Message: e.Error(),
},
)
}
return ToAdmissionResponse(causes)
}
func ValidateSchema(gvk schema.GroupVersionKind, data []byte) *admissionv1.AdmissionResponse {
in := map[string]interface{}{}
err := json.Unmarshal(data, &in)
if err != nil {
return ToAdmissionResponseError(err)
}
errs := webhooks.Validator.Validate(gvk, in)
if len(errs) > 0 {
return ValidationErrorsToAdmissionResponse(errs)
}
return nil
}
func ValidateRequestResource(request v1.GroupVersionResource, group string, resource string) bool {
gvr := v1.GroupVersionResource{Group: group, Resource: resource}
for _, version := range v12.ApiSupportedWebhookVersions {
gvr.Version = version
if gvr == request {
return true
}
}
return false
}
func ValidateStatus(data []byte) *admissionv1.AdmissionResponse {
in := map[string]interface{}{}
err := json.Unmarshal(data, &in)
if err != nil {
return ToAdmissionResponseError(err)
}
obj := unstructured.Unstructured{Object: in}
gvk := obj.GroupVersionKind()
if gvk.Kind == "" {
return ValidationErrorsToAdmissionResponse([]error{fmt.Errorf("could not determine object kind")})
}
errs := webhooks.Validator.ValidateStatus(gvk, in)
if len(errs) > 0 {
return ValidationErrorsToAdmissionResponse(errs)
}
return nil
}
func GetVMIFromAdmissionReview(ar *admissionv1.AdmissionReview) (new *v12.VirtualMachineInstance, old *v12.VirtualMachineInstance, err error) {
if !ValidateRequestResource(ar.Request.Resource, webhooks.VirtualMachineInstanceGroupVersionResource.Group, webhooks.VirtualMachineInstanceGroupVersionResource.Resource) {
return nil, nil, fmt.Errorf("expect resource to be '%s'", webhooks.VirtualMachineInstanceGroupVersionResource.Resource)
}
raw := ar.Request.Object.Raw
newVMI := v12.VirtualMachineInstance{}
err = json.Unmarshal(raw, &newVMI)
if err != nil {
return nil, nil, err
}
if ar.Request.Operation == admissionv1.Update {
raw := ar.Request.OldObject.Raw
oldVMI := v12.VirtualMachineInstance{}
err = json.Unmarshal(raw, &oldVMI)
if err != nil {
return nil, nil, err
}
return &newVMI, &oldVMI, nil
}
return &newVMI, nil, nil
}
func GetVMFromAdmissionReview(ar *admissionv1.AdmissionReview) (new *v12.VirtualMachine, old *v12.VirtualMachine, err error) {
if !ValidateRequestResource(ar.Request.Resource, webhooks.VirtualMachineGroupVersionResource.Group, webhooks.VirtualMachineGroupVersionResource.Resource) {
return nil, nil, fmt.Errorf("expect resource to be '%s'", webhooks.VirtualMachineGroupVersionResource.Resource)
}
raw := ar.Request.Object.Raw
newVM := v12.VirtualMachine{}
err = json.Unmarshal(raw, &newVM)
if err != nil {
return nil, nil, err
}
if ar.Request.Operation == admissionv1.Update {
raw := ar.Request.OldObject.Raw
oldVM := v12.VirtualMachine{}
err = json.Unmarshal(raw, &oldVM)
if err != nil {
return nil, nil, err
}
return &newVM, &oldVM, nil
}
return &newVM, nil, nil
}