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webhook.go
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webhook.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 webhook
import (
"context"
"encoding/json"
"fmt"
"strconv"
"time"
"github.com/PaesslerAG/jsonpath"
corev1 "k8s.io/api/core/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
esv1beta1 "github.com/external-secrets/external-secrets/apis/externalsecrets/v1beta1"
"github.com/external-secrets/external-secrets/pkg/common/webhook"
"github.com/external-secrets/external-secrets/pkg/utils"
)
const (
errNotImplemented = "not implemented"
)
// https://github.com/external-secrets/external-secrets/issues/644
var _ esv1beta1.SecretsClient = &WebHook{}
var _ esv1beta1.Provider = &Provider{}
// Provider satisfies the provider interface.
type Provider struct{}
type WebHook struct {
wh webhook.Webhook
store esv1beta1.GenericStore
storeKind string
url string
}
func init() {
esv1beta1.Register(&Provider{}, &esv1beta1.SecretStoreProvider{
Webhook: &esv1beta1.WebhookProvider{},
})
}
// Capabilities return the provider supported capabilities (ReadOnly, WriteOnly, ReadWrite).
func (p *Provider) Capabilities() esv1beta1.SecretStoreCapabilities {
return esv1beta1.SecretStoreReadOnly
}
func (p *Provider) NewClient(_ context.Context, store esv1beta1.GenericStore, kube client.Client, namespace string) (esv1beta1.SecretsClient, error) {
wh := webhook.Webhook{
Kube: kube,
Namespace: namespace,
}
whClient := &WebHook{
store: store,
wh: wh,
storeKind: store.GetObjectKind().GroupVersionKind().Kind,
}
if whClient.storeKind == esv1beta1.ClusterSecretStoreKind {
whClient.wh.ClusterScoped = true
}
provider, err := getProvider(store)
if err != nil {
return nil, err
}
whClient.url = provider.URL
whClient.wh.HTTP, err = whClient.wh.GetHTTPClient(provider)
if err != nil {
return nil, err
}
return whClient, nil
}
func (p *Provider) ValidateStore(_ esv1beta1.GenericStore) (admission.Warnings, error) {
return nil, nil
}
func getProvider(store esv1beta1.GenericStore) (*webhook.Spec, error) {
spc := store.GetSpec()
if spc == nil || spc.Provider == nil || spc.Provider.Webhook == nil {
return nil, fmt.Errorf("missing store provider webhook")
}
out := webhook.Spec{}
d, err := json.Marshal(spc.Provider.Webhook)
if err != nil {
return nil, err
}
err = json.Unmarshal(d, &out)
return &out, err
}
func (w *WebHook) DeleteSecret(_ context.Context, _ esv1beta1.PushSecretRemoteRef) error {
return fmt.Errorf(errNotImplemented)
}
func (w *WebHook) SecretExists(_ context.Context, _ esv1beta1.PushSecretRemoteRef) (bool, error) {
return false, fmt.Errorf(errNotImplemented)
}
// Not Implemented PushSecret.
func (w *WebHook) PushSecret(_ context.Context, _ *corev1.Secret, _ esv1beta1.PushSecretData) error {
return fmt.Errorf(errNotImplemented)
}
// Empty GetAllSecrets.
func (w *WebHook) GetAllSecrets(_ context.Context, _ esv1beta1.ExternalSecretFind) (map[string][]byte, error) {
// TO be implemented
return nil, fmt.Errorf(errNotImplemented)
}
func (w *WebHook) GetSecret(ctx context.Context, ref esv1beta1.ExternalSecretDataRemoteRef) ([]byte, error) {
provider, err := getProvider(w.store)
if err != nil {
return nil, fmt.Errorf("failed to get store: %w", err)
}
result, err := w.wh.GetWebhookData(ctx, provider, &ref)
if err != nil {
return nil, err
}
// Only parse as json if we have a jsonpath set
data, err := w.wh.GetTemplateData(ctx, &ref, provider.Secrets)
if err != nil {
return nil, err
}
resultJSONPath, err := webhook.ExecuteTemplateString(provider.Result.JSONPath, data)
if err != nil {
return nil, err
}
if resultJSONPath != "" {
jsondata := any(nil)
if err := json.Unmarshal(result, &jsondata); err != nil {
return nil, fmt.Errorf("failed to parse response json: %w", err)
}
jsondata, err = jsonpath.Get(resultJSONPath, jsondata)
if err != nil {
return nil, fmt.Errorf("failed to get response path %s: %w", resultJSONPath, err)
}
return extractSecretData(jsondata)
}
return result, nil
}
// tries to extract data from an any
// it is supposed to return a single value.
func extractSecretData(jsondata any) ([]byte, error) {
switch val := jsondata.(type) {
case bool:
return []byte(strconv.FormatBool(val)), nil
case nil:
return []byte{}, nil
case int:
return []byte(strconv.Itoa(val)), nil
case float64:
return []byte(strconv.FormatFloat(val, 'f', 0, 64)), nil
case []byte:
return val, nil
case string:
return []byte(val), nil
// due to backwards compatibility we must keep this!
// in case we see a []something we pick the first element and return it
case []any:
if len(val) == 0 {
return nil, fmt.Errorf("filter worked but didn't get any result")
}
return extractSecretData(val[0])
// in case we encounter a map we serialize it instead of erroring out
// The user should use that data from within a template and figure
// out how to deal with it.
case map[string]any:
return json.Marshal(val)
default:
return nil, fmt.Errorf("failed to get response (wrong type: %T)", jsondata)
}
}
func (w *WebHook) GetSecretMap(ctx context.Context, ref esv1beta1.ExternalSecretDataRemoteRef) (map[string][]byte, error) {
provider, err := getProvider(w.store)
if err != nil {
return nil, fmt.Errorf("failed to get store: %w", err)
}
return w.wh.GetSecretMap(ctx, provider, &ref)
}
func (w *WebHook) Close(_ context.Context) error {
return nil
}
func (w *WebHook) Validate() (esv1beta1.ValidationResult, error) {
timeout := 15 * time.Second
url := w.url
if err := utils.NetworkValidate(url, timeout); err != nil {
return esv1beta1.ValidationResultError, err
}
return esv1beta1.ValidationResultReady, nil
}