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// +build ignore
package main
import (
"bytes"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"log"
"os"
"time"
gmi "git.sr.ht/~adnano/go-gemini"
)
func main() {
var server gmi.Server
if err := server.CertificateStore.Load("/var/lib/gemini/certs"); err != nil {
log.Fatal(err)
}
server.GetCertificate = func(hostname string, store *gmi.CertificateStore) *tls.Certificate {
cert, err := store.Lookup(hostname)
if err != nil {
switch err {
case gmi.ErrCertificateExpired:
// Generate a new certificate if the current one is expired.
log.Print("Old certificate expired, creating new one")
fallthrough
case gmi.ErrCertificateUnknown:
// Generate a certificate if one does not exist.
cert, err := gmi.CreateCertificate(gmi.CertificateOptions{
DNSNames: []string{hostname},
Duration: time.Hour,
})
if err != nil {
// Failed to generate new certificate, abort
return nil
}
// Store and return the new certificate
err = writeCertificate("/var/lib/gemini/certs/"+hostname, cert)
if err != nil {
return nil
}
store.Add(hostname, cert)
return &cert
}
}
return cert
}
var mux gmi.ServeMux
mux.Handle("/", gmi.FileServer(gmi.Dir("/var/www")))
server.Register("localhost", &mux)
if err := server.ListenAndServe(); err != nil {
log.Fatal(err)
}
}
// writeCertificate writes the provided certificate and private key
// to path.crt and path.key respectively.
func writeCertificate(path string, cert tls.Certificate) error {
crt, err := marshalX509Certificate(cert.Leaf.Raw)
if err != nil {
return err
}
key, err := marshalPrivateKey(cert.PrivateKey)
if err != nil {
return err
}
// Write the certificate
crtPath := path + ".crt"
crtOut, err := os.OpenFile(crtPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
if _, err := crtOut.Write(crt); err != nil {
return err
}
// Write the private key
keyPath := path + ".key"
keyOut, err := os.OpenFile(keyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
if _, err := keyOut.Write(key); err != nil {
return err
}
return nil
}
// marshalX509Certificate returns a PEM-encoded version of the given raw certificate.
func marshalX509Certificate(cert []byte) ([]byte, error) {
var b bytes.Buffer
if err := pem.Encode(&b, &pem.Block{Type: "CERTIFICATE", Bytes: cert}); err != nil {
return nil, err
}
return b.Bytes(), nil
}
// marshalPrivateKey returns PEM encoded versions of the given certificate and private key.
func marshalPrivateKey(priv interface{}) ([]byte, error) {
var b bytes.Buffer
privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
if err != nil {
return nil, err
}
if err := pem.Encode(&b, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
return nil, err
}
return b.Bytes(), nil
}
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