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configmap.go
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/
configmap.go
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// Copyright 2022 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package resources
import (
"encoding/json"
"fmt"
webhookcip "github.com/sigstore/cosign/pkg/cosign/kubernetes/webhook/clusterimagepolicy"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"knative.dev/pkg/apis/duck"
)
// NewConfigMap returns a new ConfigMap with an entry for the given
// ClusterImagePolicy
func NewConfigMap(ns, name, cipName string, cip *webhookcip.ClusterImagePolicy) (*corev1.ConfigMap, error) {
entry, err := marshal(cip)
if err != nil {
return nil, err
}
cm := &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Namespace: ns,
Name: name,
// TODO(vaikas): Set the ownerrefs. Don't want to keep adding one
// for each CIP.
},
Data: map[string]string{
cipName: entry,
},
}
return cm, nil
}
// CreatePatch updates a particular entry to see if they are differing and
// returning the patch bytes for it that's suitable for calling
// ConfigMap.Patch with.
func CreatePatch(ns, name, cipName string, cm *corev1.ConfigMap, cip *webhookcip.ClusterImagePolicy) ([]byte, error) {
entry, err := marshal(cip)
if err != nil {
return nil, err
}
after := cm.DeepCopy()
if after.Data == nil {
after.Data = make(map[string]string)
}
after.Data[cipName] = entry
jsonPatch, err := duck.CreatePatch(cm, after)
if err != nil {
return nil, fmt.Errorf("creating JSON patch: %w", err)
}
if len(jsonPatch) == 0 {
return nil, nil
}
return jsonPatch.MarshalJSON()
}
// CreateRemovePatch removes an entry from the ConfigMap and returns the patch
// bytes for it that's suitable for calling ConfigMap.Patch with.
func CreateRemovePatch(ns, name string, cm *corev1.ConfigMap, cipName string) ([]byte, error) {
after := cm.DeepCopy()
// Just remove it without checking if it exists. If it doesn't, then no
// patch bytes are created.
delete(after.Data, cipName)
jsonPatch, err := duck.CreatePatch(cm, after)
if err != nil {
return nil, fmt.Errorf("creating JSON patch: %w", err)
}
if len(jsonPatch) == 0 {
return nil, nil
}
return jsonPatch.MarshalJSON()
}
func marshal(spec *webhookcip.ClusterImagePolicy) (string, error) {
bytes, err := json.Marshal(spec)
if err != nil {
return "", err
}
return string(bytes), nil
}