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2b17c31957
* Bump lins * Code refactoring * Fixign issues * Fixing issues * Fixing issues * Fixing issues * [WIP] * [WIP] * [WIP] * Trying to fix tests * Trying to fix tests * Fixing issues * Fixing issues * Fixing issues * Fixing issues * Fixing issues * Fixing issues * Revert go mod * Revert go mod * Revert go mod * Revert go mod * Fixing issues * Fixing issue * Code refactoring * Updating json schema version * Updating json schema version
102 lines
3.2 KiB
Go
102 lines
3.2 KiB
Go
// Copyright 2022 FairwindsOps Inc
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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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"github.com/fairwindsops/polaris/pkg/config"
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"github.com/fairwindsops/polaris/pkg/mutation"
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"github.com/sirupsen/logrus"
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"gomodules.xyz/jsonpatch/v2"
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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/webhook"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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"sigs.k8s.io/yaml"
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)
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// Mutator mutate k8s resources.
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type Mutator struct {
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Client client.Client
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Config config.Configuration
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decoder *admission.Decoder
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}
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// NewMutateWebhook creates a mutating admission webhook for the apiType.
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func NewMutateWebhook(ctx context.Context, mgr manager.Manager, c config.Configuration) {
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path := "/mutate"
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decoder := admission.NewDecoder(runtime.NewScheme())
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mutator := Mutator{
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Client: mgr.GetClient(),
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decoder: &decoder,
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Config: c,
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}
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mgr.GetWebhookServer().Register(path, &webhook.Admission{Handler: &mutator})
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}
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func (m *Mutator) mutate(ctx context.Context, req admission.Request) ([]jsonpatch.Operation, error) {
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results, kubeResources, err := GetValidatedResults(ctx, req.AdmissionRequest.Kind.Kind, m.decoder, req, m.Config)
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if err != nil {
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logrus.Errorf("Error while validating resource: %v", err)
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return nil, err
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}
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if results == nil {
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logrus.Infof("Not mutating owned pod")
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return nil, nil
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}
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patches := mutation.GetMutationsFromResult(results)
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originalYaml, err := yaml.JSONToYAML(kubeResources.OriginalObjectJSON)
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if err != nil {
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logrus.Errorf("Failed to convert JSON to YAML: %v", err)
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return nil, err
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}
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mutatedYamlStr, err := mutation.ApplyAllMutations(string(originalYaml), patches)
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if err != nil {
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logrus.Errorf("Failed to apply mutations: %v", err)
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return nil, err
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}
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mutatedJson, err := yaml.YAMLToJSON([]byte(mutatedYamlStr))
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if err != nil {
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logrus.Errorf("Failed to convert YAML to JSON: %v", err)
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return nil, err
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}
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ops, err := jsonpatch.CreatePatch(kubeResources.OriginalObjectJSON, mutatedJson)
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if err != nil {
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logrus.Errorf("Failed to create patch from mutation: %v", err)
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return nil, err
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}
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return ops, nil
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}
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// Handle for Validator to run validation checks.
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func (m *Mutator) Handle(ctx context.Context, req admission.Request) admission.Response {
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logrus.Info("Starting mutation request")
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patches, err := m.mutate(ctx, req)
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if err != nil {
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logrus.Errorf("Error while getting mutations: %v", err)
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return admission.Errored(403, err)
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}
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if patches == nil {
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logrus.Infof("No patches generated")
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return admission.Allowed("Allowed")
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}
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logrus.Infof("Generated %d patches", len(patches))
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return admission.Patched("", patches...)
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}
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