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main.go
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main.go
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package main
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
"github.com/cert-manager/cert-manager/pkg/acme/webhook/apis/acme/v1alpha1"
"github.com/cert-manager/cert-manager/pkg/acme/webhook/cmd"
"go.uber.org/zap"
extapi "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
var GroupName = os.Getenv("GROUP_NAME")
var zapLogger, _ = zap.NewProduction()
func main() {
if GroupName == "" {
panic("GROUP_NAME must be specified")
}
cmd.RunWebhookServer(GroupName,
&googledomainsDNSProviderSolver{},
)
}
type googledomainsDNSProviderSolver struct {
client *kubernetes.Clientset
}
type googledomainsDNSProviderConfig struct {
ApiUrl string `json:"apiUrl"`
DomainName string `json:"domainName"`
SecretRef string `json:"secretName"`
SecretKeyRef string `json:"secretKeyName"`
}
type Config struct {
ApiKey, DomainName, ApiUrl string
}
func (c *googledomainsDNSProviderSolver) Name() string {
return "google-domains"
}
func (c *googledomainsDNSProviderSolver) Present(ch *v1alpha1.ChallengeRequest) error {
slogger := zapLogger.Sugar()
slogger.Infof("call function Present: namespace=%s, zone=%s, fqdn=%s", ch.ResourceNamespace, ch.ResolvedZone, ch.ResolvedFQDN)
config, err := clientConfig(c, ch)
if err != nil {
return fmt.Errorf("unable to get secret `%s`; %v", ch.ResourceNamespace, err)
}
addTxtRecord(config, ch)
slogger.Infof("Presented txt record %v", ch.ResolvedFQDN)
return nil
}
func (c *googledomainsDNSProviderSolver) CleanUp(ch *v1alpha1.ChallengeRequest) error {
slogger := zapLogger.Sugar()
slogger.Infof("call function CleanUp: namespace=%s, zone=%s, fqdn=%s", ch.ResourceNamespace, ch.ResolvedZone, ch.ResolvedFQDN)
config, err := clientConfig(c, ch)
if err != nil {
return fmt.Errorf("unable to get secret `%s`; %v", ch.ResourceNamespace, err)
}
removeTxtRecord(config, ch)
slogger.Infof("Cleaned up txt record %v", ch.ResolvedFQDN)
return nil
}
func (c *googledomainsDNSProviderSolver) Initialize(kubeClientConfig *rest.Config, stopCh <-chan struct{}) error {
slogger := zapLogger.Sugar()
k8sClient, err := kubernetes.NewForConfig(kubeClientConfig)
slogger.Infof("Input variable stopCh is %d length", len(stopCh))
if err != nil {
return err
}
c.client = k8sClient
return nil
}
// Helpers -------------------------------------------------------------------
func addTxtRecord(config Config, ch *v1alpha1.ChallengeRequest) {
slogger := zapLogger.Sugar()
url := fmt.Sprintf("%s/acmeChallengeSets/%s:rotateChallenges", config.ApiUrl, config.DomainName)
var jsonStr = fmt.Sprintf(`
{
"accessToken": "%s",
"keepExpiredRecords": "true",
"recordsToAdd":
[
{
"digest": "%s",
"fqdn": "%s"
}
]
}`, config.ApiKey, ch.Key, ch.ResolvedFQDN)
add, err := callDnsApi(url, "POST", bytes.NewBuffer([]byte(jsonStr)), config)
if err != nil {
slogger.Error(err)
}
slogger.Infof("Added TXT record result: %s", string(add))
}
func removeTxtRecord(config Config, ch *v1alpha1.ChallengeRequest) {
slogger := zapLogger.Sugar()
url := fmt.Sprintf("%s/acmeChallengeSets/%s:rotateChallenges", config.ApiUrl, config.DomainName)
var jsonStr = fmt.Sprintf(`
{
"accessToken": "%s",
"keepExpiredRecords": "true",
"recordsToRemove":
[
{
"digest": "%s",
"fqdn": "%s"
}
]
}`, config.ApiKey, ch.Key, ch.ResolvedFQDN)
remove, err := callDnsApi(url, "POST", bytes.NewBuffer([]byte(jsonStr)), config)
if err != nil {
slogger.Error(err)
}
slogger.Infof("Removed TXT record result: %s", string(remove))
}
// Config ------------------------------------------------------
func stringFromSecretData(secretData *map[string][]byte, key string) (string, error) {
data, ok := (*secretData)[key]
if !ok {
return "", fmt.Errorf("key %q not found in secret data", key)
}
return string(data), nil
}
func loadConfig(cfgJSON *extapi.JSON) (googledomainsDNSProviderConfig, error) {
cfg := googledomainsDNSProviderConfig{}
// handle the 'base case' where no configuration has been provided
if cfgJSON == nil {
return cfg, nil
}
if err := json.Unmarshal(cfgJSON.Raw, &cfg); err != nil {
return cfg, fmt.Errorf("error decoding solver config: %v", err)
}
return cfg, nil
}
func clientConfig(c *googledomainsDNSProviderSolver, ch *v1alpha1.ChallengeRequest) (Config, error) {
var config Config
cfg, err := loadConfig(ch.Config)
if err != nil {
return config, err
}
config.ApiUrl = cfg.ApiUrl
config.DomainName = cfg.DomainName
secretName := cfg.SecretRef
secretKeyName := cfg.SecretKeyRef
sec, err := c.client.CoreV1().Secrets(ch.ResourceNamespace).Get(context.TODO(), secretName, metav1.GetOptions{})
if err != nil {
return config, fmt.Errorf("unable to get secret `%s/%s`; %v", secretName, ch.ResourceNamespace, err)
}
apiKey, err := stringFromSecretData(&sec.Data, secretKeyName)
config.ApiKey = apiKey
if err != nil {
return config, fmt.Errorf("unable to get api-key from secret `%s/%s`; %v", secretName, ch.ResourceNamespace, err)
}
return config, nil
}
// REST Request ------------------------------------------------------
func callDnsApi(url string, method string, body io.Reader, config Config) ([]byte, error) {
slogger := zapLogger.Sugar()
req, err := http.NewRequest(method, url, body)
if err != nil {
return []byte{}, fmt.Errorf("unable to execute request %v", err)
}
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer func() {
err := resp.Body.Close()
if err != nil {
slogger.Fatal(err)
}
}()
respBody, _ := io.ReadAll(resp.Body)
if resp.StatusCode == http.StatusOK {
return respBody, nil
}
text := "Error calling API status:" + resp.Status + " url: " + url + " method: " + method
slogger.Error(text)
return nil, errors.New(text)
}