94 lines
2.9 KiB
Go
94 lines
2.9 KiB
Go
/*
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Copyright 2019 The Jetstack cert-manager contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"flag"
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"os"
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"time"
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"github.com/openshift/generic-admission-server/pkg/cmd"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/klog"
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"github.com/jetstack/cert-manager/pkg/apis/certmanager/v1alpha1"
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"github.com/jetstack/cert-manager/pkg/logs"
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"github.com/jetstack/cert-manager/pkg/webhook"
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"github.com/jetstack/cert-manager/pkg/webhook/handlers"
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)
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var (
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GroupName = "webhook." + v1alpha1.SchemeGroupVersion.Group
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)
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var (
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validationFuncs = map[schema.GroupVersionKind]handlers.ValidationFunc{
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v1alpha1.SchemeGroupVersion.WithKind(v1alpha1.CertificateKind): webhook.ValidateCertificate,
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v1alpha1.SchemeGroupVersion.WithKind(v1alpha1.CertificateRequestKind): webhook.ValidateCertificateRequest,
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v1alpha1.SchemeGroupVersion.WithKind(v1alpha1.IssuerKind): webhook.ValidateIssuer,
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v1alpha1.SchemeGroupVersion.WithKind(v1alpha1.ClusterIssuerKind): webhook.ValidateClusterIssuer,
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}
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)
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var validationHook cmd.ValidatingAdmissionHook = handlers.NewFuncBackedValidator(logs.Log, GroupName, webhook.Scheme, validationFuncs)
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var mutationHook cmd.MutatingAdmissionHook = handlers.NewSchemeBackedDefaulter(logs.Log, GroupName, webhook.Scheme)
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func main() {
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// Avoid "logging before flag.Parse" errors from glog
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flag.CommandLine.Parse([]string{})
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// parse the command line flags to pull out the tls-cert-file
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// argument. This flag will be parsed by code inside cmd.RunAdmissionServer
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// so no need to pass it through the call stack or have nice errors
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tlsflagSet := flag.NewFlagSet("tls", flag.ContinueOnError)
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tlsflagVal := tlsflagSet.String("tls-cert-file", "", "")
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tlsflagSet.Parse(os.Args[1:])
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if *tlsflagVal != "" {
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runfilewatch(*tlsflagVal)
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}
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cmd.RunAdmissionServer(
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validationHook,
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mutationHook,
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)
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}
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func runfilewatch(filename string) {
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info, err := os.Stat(filename)
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if err != nil {
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// missing TLS cert file will get turned into a proper error later
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return
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}
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modtime := info.ModTime()
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go func() {
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for {
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time.Sleep(1 * time.Minute)
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info, err := os.Stat(filename)
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if err != nil {
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continue
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}
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if info.ModTime().After(modtime) {
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// let the k8s scheduler restart us
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// TODO(dmo): figure out if there's a way to do this with clean
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// shutdown
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klog.Info("Detected change in TLS certificate %s. Restarting to pick up new certificate", filename)
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os.Exit(0)
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}
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}
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}()
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}
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