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tls.go
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tls.go
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package listener
import (
"crypto/tls"
"fmt"
"log"
"net"
"path/filepath"
"sync"
"github.com/fsnotify/fsnotify"
)
type tlsListener struct {
net.Listener
cert string
key string
lockCrt sync.RWMutex
crt *tls.Certificate
once sync.Once
closeCh chan struct{}
}
func NewTlsListener(inner net.Listener, cert, key string) net.Listener {
t := &tlsListener{
cert: cert,
key: key,
closeCh: make(chan struct{}),
}
go t.watcher()
t.Listener = tls.NewListener(
inner, &tls.Config{
GetCertificate: t.getCertificate,
},
)
return t
}
func (t *tlsListener) getCertificate(_ *tls.ClientHelloInfo) (*tls.Certificate, error) {
t.lockCrt.RLock()
defer t.lockCrt.RUnlock()
if t.crt == nil {
return nil, fmt.Errorf("tls listener: certificate is not set")
}
return t.crt, nil
}
func (t *tlsListener) update() {
crt, err := tls.LoadX509KeyPair(t.cert, t.key)
if err != nil {
log.Printf("tls listener: load certificate: %s", err)
return
}
t.lockCrt.Lock()
defer t.lockCrt.Unlock()
t.crt = &crt
}
func certModified(event fsnotify.Event, cert string) bool {
return filepath.Clean(event.Name) == cert && event.Has(fsnotify.Create|fsnotify.Write)
}
func symlinkModified(cur, prev string) bool {
return cur != "" && cur != prev
}
func (t *tlsListener) watcher() {
t.update()
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Printf("tls listener: watcher: %s", err)
return
}
defer watcher.Close()
// https://github.com/cloudflare/certinel/
certPath := filepath.Clean(t.cert)
certDir, _ := filepath.Split(certPath)
realCertPath, _ := filepath.EvalSymlinks(certPath)
if err := watcher.Add(certDir); err != nil {
log.Printf("tls listener: watcher: %s", err)
return
}
for {
select {
case <-t.closeCh:
return
case event := <-watcher.Events:
currentPath, err := filepath.EvalSymlinks(certPath)
if err != nil {
continue
}
if certModified(event, certPath) || symlinkModified(currentPath, realCertPath) {
realCertPath = currentPath
t.update()
log.Println("tls listener: watcher: certificate updated")
}
case err := <-watcher.Errors:
log.Printf("tls listener: watcher error: %s", err)
}
}
}
func (t *tlsListener) Close() error {
err := t.Listener.Close()
t.once.Do(func() {
close(t.closeCh)
})
return err
}