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extract.go
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/
extract.go
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package cert
import (
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"io/ioutil"
"log"
"os"
"path/filepath"
"sort"
"strings"
"time"
"github.com/fsnotify/fsnotify"
"github.com/grantae/certinfo"
"go.uber.org/zap"
)
const (
endCertificate = "-----END CERTIFICATE-----"
timeFormat = "02.01.2006"
)
// Certs all certificates
type Certs interface {
WatchFileChanges()
Certs() []Cert
}
func New(log *zap.SugaredLogger, acme string, certsDir string) (Certs, error) {
c := &certs{
log: log,
acme: acme,
dir: certsDir,
certs: make(map[string]Cert),
}
return c, c.extract()
}
type certs struct {
certs map[string]Cert
log *zap.SugaredLogger
acme string
dir string
}
// Cert a certificate
type Cert struct {
Name string
NotBefore time.Time
NotAfter time.Time
}
// NotBeforeString NotBefore as string
func (c *Cert) NotBeforeString() string {
return c.NotBefore.Format(timeFormat)
}
// NotAfterString NotAfter as string
func (c *Cert) NotAfterString() string {
return c.NotAfter.Format(timeFormat)
}
// Certs get the current certs
func (c *certs) Certs() []Cert {
var certs []Cert
for _, value := range c.certs {
certs = append(certs, value)
}
sort.Slice(certs, func(i, j int) bool {
return certs[i].Name > certs[j].Name
})
return certs
}
// WatchFileChanges watch acme file changes and update the certs
func (c *certs) WatchFileChanges() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
done := make(chan bool)
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Op&fsnotify.Write == fsnotify.Write {
c.log.Infow("modified file", "name", event.Name)
time.Sleep(time.Second)
if err := c.extract(); err != nil {
c.log.Error(err)
}
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
c.log.Error(err)
}
}
}()
err = watcher.Add(c.acme)
if err != nil {
log.Fatal(err)
}
<-done
}
func (c *certs) extract() error {
dat, err := ioutil.ReadFile(c.acme)
if err != nil {
return err
}
acme := &Acme{}
if err := json.Unmarshal(dat, acme); err != nil {
return err
}
for _, r := range *acme {
for _, crt := range r.Certificates {
c.log.Infow("extracting certs", "domain", crt.Domain.Main)
dir := filepath.Join(c.dir, crt.Domain.Main)
err = os.MkdirAll(dir, os.ModePerm)
if err != nil {
return err
}
var fullChain []byte
if fullChain, err = c.writeCert(filepath.Join(dir, "fullchain.pem"), crt.Certificate); err != nil {
return err
}
cert, chain := c.splitCert(fullChain)
err = ioutil.WriteFile(filepath.Join(dir, "cert.pem"), cert, 0644)
if err != nil {
return err
}
err = ioutil.WriteFile(filepath.Join(dir, "chain.pem"), chain, 0644)
if err != nil {
return err
}
info, infoCrt, err := c.info(cert)
if err == nil {
err = ioutil.WriteFile(filepath.Join(dir, "info"), []byte(info), 0644)
if err != nil {
return err
}
}
if err != nil {
return err
}
if _, err := c.writeCert(filepath.Join(dir, "privkey.pem"), crt.Key); err != nil {
return err
}
c.certs[crt.Domain.Main] = Cert{
Name: crt.Domain.Main,
NotBefore: infoCrt.NotBefore,
NotAfter: infoCrt.NotAfter,
}
}
}
return nil
}
func (c *certs) splitCert(fullChain []byte) ([]byte, []byte) {
var cert []string
var chain []string
certDone := false
for _, l := range strings.Split(string(fullChain), "\n") {
if strings.TrimSpace(l) != "" {
if !certDone {
cert = append(cert, l)
certDone = endCertificate == strings.TrimSpace(l)
} else {
chain = append(chain, l)
}
}
}
return []byte(strings.Join(cert, "\n")), []byte(strings.Join(chain, "\n"))
}
func (c *certs) info(cert []byte) (string, *x509.Certificate, error) {
block, _ := pem.Decode(cert)
if block == nil {
return "", nil, errors.New("error decoding cert")
}
crt, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return "", nil, err
}
info, err := certinfo.CertificateText(crt)
return info, crt, err
}
func (c *certs) writeCert(path string, data string) ([]byte, error) {
cert, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return nil, err
}
err = ioutil.WriteFile(path, cert, 0644)
if err != nil {
return nil, err
}
return cert, nil
}