mirror of
https://github.com/FairwindsOps/polaris.git
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112 lines
3.2 KiB
Go
112 lines
3.2 KiB
Go
// Copyright 2019 ReactiveOps
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package webhook
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import (
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"context"
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"fmt"
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"net/http"
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"os"
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conf "github.com/reactiveops/fairwinds/pkg/config"
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validator "github.com/reactiveops/fairwinds/pkg/validator"
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admissionregistrationv1beta1 "k8s.io/api/admissionregistration/v1beta1"
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appsv1 "k8s.io/api/apps/v1"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/manager"
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"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission/builder"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission/types"
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)
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// Validator validates k8s resources.
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type Validator struct {
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client client.Client
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decoder types.Decoder
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Config conf.Configuration
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}
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var _ inject.Client = &Validator{}
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// InjectClient injects the client.
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func (v *Validator) InjectClient(c client.Client) error {
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v.client = c
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return nil
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}
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var _ inject.Decoder = &Validator{}
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// InjectDecoder injects the decoder.
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func (v *Validator) InjectDecoder(d types.Decoder) error {
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v.decoder = d
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return nil
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}
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var _ admission.Handler = &Validator{}
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// NewWebhook creates a validating admission webhook for the apiType.
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func NewWebhook(name string, mgr manager.Manager, validator Validator, apiType runtime.Object) *admission.Webhook {
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name = fmt.Sprintf("%s.k8s.io", name)
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path := fmt.Sprintf("/validating-%s", name)
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webhook, err := builder.NewWebhookBuilder().
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Name(name).
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Validating().
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Path(path).
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Operations(admissionregistrationv1beta1.Create, admissionregistrationv1beta1.Update).
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WithManager(mgr).
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ForType(apiType).
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Handlers(&validator).
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Build()
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if err != nil {
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fmt.Printf("Unable to setup validating webhook: %s\n", name)
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fmt.Printf("Error: %v\n", err)
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os.Exit(1)
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}
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return webhook
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}
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// Handle for Validator to run validation checks.
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func (v *Validator) Handle(ctx context.Context, req types.Request) types.Response {
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var err error
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var allowed bool
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var reason string
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var results validator.ResourceResult
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switch req.AdmissionRequest.Kind.Kind {
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case "Deployment":
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deploy := appsv1.Deployment{}
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err = v.decoder.Decode(req, &deploy)
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results = validator.ValidateDeploy(v.Config, &deploy)
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case "Pod":
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pod := corev1.Pod{}
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err = v.decoder.Decode(req, &pod)
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results = validator.ValidatePod(v.Config, &pod.Spec)
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}
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if err != nil {
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return admission.ErrorResponse(http.StatusBadRequest, err)
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}
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if results.Summary.Errors > 0 {
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// TODO: Decide what message we want to return here.
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allowed, reason = false, "failed validation checks, view details on dashbaord."
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}
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return admission.ValidationResponse(allowed, reason)
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}
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