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admission.go
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admission.go
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package orchestration
import (
"context"
"encoding/json"
"fmt"
"net/http"
"strings"
"github.com/atlassian/voyager"
"github.com/atlassian/voyager/pkg/admission"
orch_v1 "github.com/atlassian/voyager/pkg/apis/orchestration/v1"
"github.com/go-chi/chi"
"github.com/pkg/errors"
"go.uber.org/zap"
admissionv1beta1 "k8s.io/api/admission/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
var stateResource = metav1.GroupVersionResource{
Group: orch_v1.SchemeGroupVersion.Group,
Version: orch_v1.SchemeGroupVersion.Version,
Resource: orch_v1.StateResourcePlural,
}
func SetupAdmissionWebhooks(r *chi.Mux) {
r.Post(
"/admission/statevalidation",
admission.AdmitFuncHandlerFunc("statevalidation", stateValidationAdmitFunc))
}
func stateValidationAdmitFunc(ctx context.Context, logger *zap.Logger, admissionReview admissionv1beta1.AdmissionReview) (*admissionv1beta1.AdmissionResponse, error) {
admissionRequest := admissionReview.Request
// Validate supported operations
if admissionRequest.Operation != admissionv1beta1.Create && admissionRequest.Operation != admissionv1beta1.Update {
return nil, errors.Errorf("only create or update is supported, got %q", admissionRequest.Operation)
}
if admissionRequest.Resource != stateResource {
return nil, errors.Errorf("only State is supported, got %q", admissionRequest.Resource)
}
state := orch_v1.State{}
if err := json.Unmarshal(admissionRequest.Object.Raw, &state); err != nil {
return nil, errors.WithStack(err)
}
return admitState(&state)
}
func admitState(state *orch_v1.State) (*admissionv1beta1.AdmissionResponse, error) {
// Very dumb TODO - this validation code should probably exist somewhere else
// to avoid the admission webhook having the entire validation impl here.
// For a better errorlist implementation, maybe take a look at
// kubernetes apimachinery/pkg/util/validation/field/errors.go
var errorlist []string
resourceNames := make(map[voyager.ResourceName]struct{})
for _, stateResource := range state.Spec.Resources {
if _, ok := resourceNames[stateResource.Name]; ok {
errorlist = append(errorlist, fmt.Sprintf("duplicate resource name %q", stateResource.Name))
} else {
resourceNames[stateResource.Name] = struct{}{}
}
}
if len(errorlist) > 0 {
return &admissionv1beta1.AdmissionResponse{
Allowed: false,
Result: &metav1.Status{
Message: strings.Join(errorlist, ", "),
Code: http.StatusUnprocessableEntity,
Reason: metav1.StatusReasonInvalid,
},
}, nil
}
return &admissionv1beta1.AdmissionResponse{
Allowed: true,
Result: &metav1.Status{
Message: "no validation errors found in State",
},
}, nil
}