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tf_controller_webhooks.go
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tf_controller_webhooks.go
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package controllers
import (
"bytes"
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"sigs.k8s.io/kustomize/kyaml/yaml"
"strings"
"text/template"
"github.com/hashicorp/go-cleanhttp"
infrav1 "github.com/weaveworks/tf-controller/api/v1alpha1"
"github.com/weaveworks/tf-controller/runner"
ctrl "sigs.k8s.io/controller-runtime"
)
func shouldProcessPostPlanningWebhooks(terraform infrav1.Terraform) bool {
if terraform.Spec.Webhooks == nil || len(terraform.Spec.Webhooks) < 1 {
return false
}
for _, webhook := range terraform.Spec.Webhooks {
if webhook.Stage == infrav1.PostPlanningWebhook {
return true
}
}
// TODO add better condition here
return false
}
func (r *TerraformReconciler) prepareWebhookPayload(terraform infrav1.Terraform, runnerClient runner.RunnerClient, payloadType string) ([]byte, error) {
toBytes, err := terraform.ToBytes(r.Scheme)
if err != nil {
err = fmt.Errorf("failed to marshal Terraform resource: %w", err)
return nil, err
}
reply, err := runnerClient.ShowPlanFile(context.Background(), &runner.ShowPlanFileRequest{
TfInstance: "1",
Filename: runner.TFPlanName,
})
if err != nil {
err = fmt.Errorf("failed to get plan file: %w", err)
return nil, err
}
planInJSON := reply.JsonOutput
planObj, err := yaml.ConvertJSONToYamlNode(string(planInJSON))
if err != nil {
err = fmt.Errorf("failed to convert plan file to YAML: %w", err)
return nil, err
}
obj, err := yaml.ConvertJSONToYamlNode(string(toBytes))
if err != nil {
err = fmt.Errorf("failed to convert Terraform resource to YAML: %w", err)
return nil, err
}
if payloadType == "SpecAndPlan" {
obj, err = obj.Pipe(
yaml.Tee(yaml.Clear("status")),
yaml.Tee(
yaml.LookupCreate(yaml.MappingNode, "status"),
yaml.SetField("tfplan", planObj),
),
)
} else if payloadType == "SpecOnly" {
obj, err = obj.Pipe(
yaml.Tee(yaml.Clear("status")),
)
} else if payloadType == "PlanOnly" {
obj = planObj
} else {
return nil, fmt.Errorf("unknown payload type: %s", payloadType)
}
if err != nil {
err = fmt.Errorf("failed to add tfplan to Terraform resource: %w", err)
return nil, err
}
jsonBytes, err := obj.MarshalJSON()
if err != nil {
err = fmt.Errorf("failed to marshal Terraform resource with plan: %w", err)
return nil, err
}
return jsonBytes, nil
}
func (r *TerraformReconciler) processPostPlanningWebhooks(ctx context.Context, terraform infrav1.Terraform, runnerClient runner.RunnerClient, revision string) (infrav1.Terraform, error) {
log := ctrl.LoggerFrom(ctx)
hooks := []infrav1.Webhook{}
for _, webhook := range terraform.Spec.Webhooks {
if webhook.Stage == infrav1.PostPlanningWebhook {
hooks = append(hooks, webhook)
}
}
if len(hooks) == 0 {
return terraform, nil
}
disableWebhookTLSVerification := os.Getenv("DISABLE_WEBHOOK_TLS_VERIFY") == "1"
for _, webhook := range hooks {
log.Info("processing post-planning webhook", "webhook", webhook.URL)
// We skip webhook if it's not enabled
if webhook.IsEnabled() == false {
continue
}
log.Info("webhook is enabled, processing")
payloadBytes, err := r.prepareWebhookPayload(terraform, runnerClient, webhook.PayloadType)
if err != nil {
err = fmt.Errorf("failed to prepare webhook payload: %w", err)
return terraform, err
}
log.Info("webhook payload prepared")
cli := cleanhttp.DefaultClient()
if disableWebhookTLSVerification == false {
log.Info("webhook TLS verification is enabled")
// parse webhook.URL and get the server name
u, err := url.Parse(webhook.URL)
if err != nil {
err = fmt.Errorf("failed to parse webhook URL: %w", err)
return terraform, err
}
log.Info("webhook URL parsed", "host", u.Host)
caCertPath := "/etc/certs/" + u.Hostname() + "/ca.crt"
caCertPool := x509.NewCertPool()
caCert, err := ioutil.ReadFile(caCertPath)
if err == nil {
caCertPool.AppendCertsFromPEM(caCert)
}
log.Info("webhook CA cert loaded", "path", caCertPath)
tlsCertPath := "/etc/certs/" + u.Hostname() + "/tls.crt"
tlsKeyPath := "/etc/certs/" + u.Hostname() + "/tls.key"
certificate, err := tls.LoadX509KeyPair(tlsCertPath, tlsKeyPath)
if err != nil {
err = fmt.Errorf("failed to load webhook TLS certificate: %w", err)
return terraform, err
}
log.Info("webhook TLS cert loaded", "path", tlsCertPath, "keypath", tlsKeyPath)
cli.Transport.(*http.Transport).TLSClientConfig = &tls.Config{
RootCAs: caCertPool,
Certificates: []tls.Certificate{certificate},
}
log.Info("webhook TLS config set")
}
post, err := cli.Post(webhook.URL, "application/json", bytes.NewReader(payloadBytes))
if err != nil {
err = fmt.Errorf("failed to send webhook: %w", err)
return terraform, err
}
log.Info("webhook sent")
if post.StatusCode != 200 {
return terraform, fmt.Errorf("webhook %s returned %d: %s", webhook.URL, post.StatusCode, post.Status)
}
log.Info(fmt.Sprintf("webhook returned %d: %s", post.StatusCode, post.Status))
// read json from post.Body, unmarshall to map[string]interface{}
jsonReply := map[string]interface{}{}
err = json.NewDecoder(post.Body).Decode(&jsonReply)
if err != nil {
err = fmt.Errorf("failed to decode webhook reply: %w", err)
return terraform, err
}
log.Info("webhook reply decoded")
// Test if the reply contains a good result
testExprTpl, err := template.New("testexpr").Parse(webhook.TestExpression)
if err != nil {
err = fmt.Errorf("failed to parse webhook test expression: %w", err)
return terraform, err
}
log.Info("webhook test expression parsed")
var testExprBuf bytes.Buffer
err = testExprTpl.Execute(&testExprBuf, jsonReply)
if err != nil {
err = fmt.Errorf("failed to execute webhook test expression: %w", err)
return terraform, err
}
log.Info("webhook test expression executed")
testResult := strings.TrimSpace(testExprBuf.String())
if testResult == "true" || testResult == "yes" {
log.Info("webhook test expression returned true, webhook is successful")
continue
} else if testResult == "false" || testResult == "no" {
// do nothing
} else {
return terraform, fmt.Errorf("webhook test expression %q returned unexpected result: %s", webhook.TestExpression, testResult)
}
log.Info("webhook test expression returned false, webhook is not successful - prepare error message")
// Extract the error message from the webhook response
errMsgTpl, err := template.New("errmsg").Parse(webhook.ErrorMessageTemplate)
if err != nil {
err = fmt.Errorf("failed to parse webhook error message template: %w", err)
return terraform, err
}
log.Info("webhook error message template parsed")
var errorMessage bytes.Buffer
err = errMsgTpl.Execute(&errorMessage, jsonReply)
if err != nil {
err = fmt.Errorf("failed to execute webhook error message template: %w", err)
return terraform, err
}
log.Info("webhook error message template executed")
terraform = infrav1.TerraformPostPlanningWebhookFailed(terraform, revision, errorMessage.String())
webhookErr := fmt.Errorf(errorMessage.String())
return terraform, webhookErr
}
return terraform, nil
}