/
server.go
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/
server.go
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package admission
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"github.com/go-logr/logr"
admissionv1 "k8s.io/api/admission/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/webhook"
apisixoperatorv1alpha1 "github.com/chever-john/apisix-operator/apis/v1alpha1"
"github.com/chever-john/apisix-operator/internal/validation/dataplane"
)
var (
scheme = runtime.NewScheme()
codecs = serializer.NewCodecFactory(scheme)
)
// NewWebhookServerFromManager creates a webhook server in manager.
func NewWebhookServerFromManager(mgr ctrl.Manager, logger logr.Logger) *webhook.Server {
hookServer := mgr.GetWebhookServer()
handler := NewRequestHandler(mgr.GetClient(), logger)
hookServer.Register("/validate", handler)
return hookServer
}
// Validator is the interface of validating
type Validator interface {
ValidateControlPlane(context.Context, apisixoperatorv1alpha1.ControlPlane) error
ValidateDataPlane(context.Context, apisixoperatorv1alpha1.DataPlane) error
}
// RequestHandler handles the requests of validating objects.
type RequestHandler struct {
// Validator validates the entities that the k8s API-server asks
// it the server to validate.
Validator Validator
Logger logr.Logger
}
// NewRequestHandler create a RequestHandler to handle validation requests.
func NewRequestHandler(c client.Client, l logr.Logger) *RequestHandler {
return &RequestHandler{
Validator: &validator{
dataplaneValidator: dataplane.NewValidator(c),
},
Logger: l.WithValues("component", "validation-server"),
}
}
// ServeHTTP serves for HTTP requests.
func (h *RequestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Body == nil {
h.Logger.Error(fmt.Errorf("empty body"), "received request with empty body")
http.Error(w, "admission review object is missing", http.StatusBadRequest)
return
}
data, err := io.ReadAll(r.Body)
if err != nil {
h.Logger.Error(err, "failed to read request from client")
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
review := &admissionv1.AdmissionReview{}
if err := json.Unmarshal(data, review); err != nil {
h.Logger.Error(err, "failed to parse AdmissionReview object")
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
response, err := h.handleValidation(r.Context(), review.Request)
if err != nil {
h.Logger.Error(err, "failed to run validation")
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
review.Response = response
data, err = json.Marshal(review)
if err != nil {
h.Logger.Error(err, "failed to marshal response")
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
_, err = w.Write(data)
if err != nil {
h.Logger.Error(err, "failed to write response")
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
var (
controlPlaneGVResource = metav1.GroupVersionResource{
Group: apisixoperatorv1alpha1.SchemeGroupVersion.Group,
Version: apisixoperatorv1alpha1.SchemeGroupVersion.Version,
Resource: "controlplanes",
}
dataPlaneGVResource = metav1.GroupVersionResource{
Group: apisixoperatorv1alpha1.SchemeGroupVersion.Group,
Version: apisixoperatorv1alpha1.SchemeGroupVersion.Version,
Resource: "dataplanes",
}
)
func (h *RequestHandler) handleValidation(ctx context.Context, req *admissionv1.AdmissionRequest) (
*admissionv1.AdmissionResponse, error) {
if req == nil {
return &admissionv1.AdmissionResponse{
Allowed: false,
Result: &metav1.Status{
Code: http.StatusBadRequest,
Reason: metav1.StatusReasonBadRequest,
Message: "empty request",
Status: metav1.StatusFailure,
},
}, nil
}
var (
response admissionv1.AdmissionResponse
ok = true
msg string
deserializer = codecs.UniversalDeserializer()
)
switch req.Resource {
case controlPlaneGVResource:
controlPlane := apisixoperatorv1alpha1.ControlPlane{}
if req.Operation == admissionv1.Create || req.Operation == admissionv1.Update {
_, _, err := deserializer.Decode(req.Object.Raw, nil, &controlPlane)
if err != nil {
return nil, err
}
err = h.Validator.ValidateControlPlane(ctx, controlPlane)
if err != nil {
ok = false
msg = err.Error()
}
}
case dataPlaneGVResource:
dataPlane := apisixoperatorv1alpha1.DataPlane{}
if req.Operation == admissionv1.Create || req.Operation == admissionv1.Update {
_, _, err := deserializer.Decode(req.Object.Raw, nil, &dataPlane)
if err != nil {
return nil, err
}
err = h.Validator.ValidateDataPlane(ctx, dataPlane)
if err != nil {
ok = false
msg = err.Error()
}
}
}
response.UID = req.UID
response.Allowed = ok
response.Result = &metav1.Status{
Message: msg,
}
if ok {
response.Result.Code = http.StatusOK
response.Result.Status = metav1.StatusSuccess
} else {
response.Result.Code = http.StatusBadRequest
response.Result.Reason = metav1.StatusReasonBadRequest
response.Result.Status = metav1.StatusFailure
}
return &response, nil
}