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parser.go
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parser.go
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/*
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 templating
import (
"context"
"encoding/json"
"fmt"
"strings"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
esv1beta1 "github.com/external-secrets/external-secrets/apis/externalsecrets/v1beta1"
"github.com/external-secrets/external-secrets/pkg/template"
)
const fieldOwnerTemplate = "externalsecrets.external-secrets.io/%v"
var (
errTplCMMissingKey = "error in configmap %s: missing key %s"
errTplSecMissingKey = "error in secret %s: missing key %s"
errExecTpl = "could not execute template: %w"
)
type Parser struct {
Exec template.ExecFunc
DataMap map[string][]byte
Client client.Client
TargetSecret *v1.Secret
}
func (p *Parser) MergeConfigMap(ctx context.Context, namespace string, tpl esv1beta1.TemplateFrom) error {
if tpl.ConfigMap == nil {
return nil
}
var cm v1.ConfigMap
err := p.Client.Get(ctx, types.NamespacedName{
Name: tpl.ConfigMap.Name,
Namespace: namespace,
}, &cm)
if err != nil {
return err
}
for _, k := range tpl.ConfigMap.Items {
val, ok := cm.Data[k.Key]
out := make(map[string][]byte)
if !ok {
return fmt.Errorf(errTplCMMissingKey, tpl.ConfigMap.Name, k.Key)
}
switch k.TemplateAs {
case esv1beta1.TemplateScopeValues:
out[k.Key] = []byte(val)
case esv1beta1.TemplateScopeKeysAndValues:
out[val] = []byte(val)
}
err = p.Exec(out, p.DataMap, k.TemplateAs, tpl.Target, p.TargetSecret)
if err != nil {
return err
}
}
return nil
}
func (p *Parser) MergeSecret(ctx context.Context, namespace string, tpl esv1beta1.TemplateFrom) error {
if tpl.Secret == nil {
return nil
}
var sec v1.Secret
err := p.Client.Get(ctx, types.NamespacedName{
Name: tpl.Secret.Name,
Namespace: namespace,
}, &sec)
if err != nil {
return err
}
for _, k := range tpl.Secret.Items {
val, ok := sec.Data[k.Key]
if !ok {
return fmt.Errorf(errTplSecMissingKey, tpl.Secret.Name, k.Key)
}
out := make(map[string][]byte)
switch k.TemplateAs {
case esv1beta1.TemplateScopeValues:
out[k.Key] = val
case esv1beta1.TemplateScopeKeysAndValues:
out[string(val)] = val
}
err = p.Exec(out, p.DataMap, k.TemplateAs, tpl.Target, p.TargetSecret)
if err != nil {
return err
}
}
return nil
}
func (p *Parser) MergeLiteral(_ context.Context, tpl esv1beta1.TemplateFrom) error {
if tpl.Literal == nil {
return nil
}
out := make(map[string][]byte)
out[*tpl.Literal] = []byte(*tpl.Literal)
return p.Exec(out, p.DataMap, esv1beta1.TemplateScopeKeysAndValues, tpl.Target, p.TargetSecret)
}
func (p *Parser) MergeTemplateFrom(ctx context.Context, namespace string, template *esv1beta1.ExternalSecretTemplate) error {
if template == nil {
return nil
}
for _, tpl := range template.TemplateFrom {
err := p.MergeConfigMap(ctx, namespace, tpl)
if err != nil {
return err
}
err = p.MergeSecret(ctx, namespace, tpl)
if err != nil {
return err
}
err = p.MergeLiteral(ctx, tpl)
if err != nil {
return err
}
}
return nil
}
func (p *Parser) MergeMap(tplMap map[string]string, target esv1beta1.TemplateTarget) error {
byteMap := make(map[string][]byte)
for k, v := range tplMap {
byteMap[k] = []byte(v)
}
err := p.Exec(byteMap, p.DataMap, esv1beta1.TemplateScopeValues, target, p.TargetSecret)
if err != nil {
return fmt.Errorf(errExecTpl, err)
}
return nil
}
func GetManagedAnnotationKeys(secret *v1.Secret, fieldOwner string) ([]string, error) {
return getManagedFieldKeys(secret, fieldOwner, func(fields map[string]any) []string {
metadataFields, exists := fields["f:metadata"]
if !exists {
return nil
}
mf, ok := metadataFields.(map[string]any)
if !ok {
return nil
}
annotationFields, exists := mf["f:annotations"]
if !exists {
return nil
}
af, ok := annotationFields.(map[string]any)
if !ok {
return nil
}
var keys []string
for k := range af {
keys = append(keys, k)
}
return keys
})
}
func GetManagedLabelKeys(secret *v1.Secret, fieldOwner string) ([]string, error) {
return getManagedFieldKeys(secret, fieldOwner, func(fields map[string]any) []string {
metadataFields, exists := fields["f:metadata"]
if !exists {
return nil
}
mf, ok := metadataFields.(map[string]any)
if !ok {
return nil
}
labelFields, exists := mf["f:labels"]
if !exists {
return nil
}
lf, ok := labelFields.(map[string]any)
if !ok {
return nil
}
var keys []string
for k := range lf {
keys = append(keys, k)
}
return keys
})
}
func getManagedFieldKeys(
secret *v1.Secret,
fieldOwner string,
process func(fields map[string]any) []string,
) ([]string, error) {
fqdn := fmt.Sprintf(fieldOwnerTemplate, fieldOwner)
var keys []string
for _, v := range secret.ObjectMeta.ManagedFields {
if v.Manager != fqdn {
continue
}
fields := make(map[string]any)
err := json.Unmarshal(v.FieldsV1.Raw, &fields)
if err != nil {
return nil, fmt.Errorf("error unmarshaling managed fields: %w", err)
}
for _, key := range process(fields) {
if key == "." {
continue
}
keys = append(keys, strings.TrimPrefix(key, "f:"))
}
}
return keys, nil
}