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path: root/cmd/batch/files.go
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package main

import (
	"crypto"
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"io"
	"os"
	"path"
	"path/filepath"
	"time"

	"dim13.org/acme"
)

type Cert struct {
	tls.Certificate
	keyFile string
	crtFile string
	sigFile string
	crypto.PrivateKey
}

func (c Cert) String() string {
	return fmt.Sprint(c.Leaf.DNSNames, " valid until ", c.Leaf.NotAfter)
}

func (c Cert) IsValid(grace time.Duration) bool {
	return time.Now().Add(grace).Before(c.Leaf.NotAfter)
}

func loadFiles(crtFile, keyFile string) (Cert, error) {
	crt, err := tls.LoadX509KeyPair(crtFile, keyFile)
	if err != nil {
		return Cert{}, err
	}
	crt.Leaf, err = x509.ParseCertificate(crt.Certificate[0])
	if err != nil {
		return Cert{}, err
	}
	return Cert{Certificate: crt, keyFile: keyFile, crtFile: crtFile}, nil
}

func newFile(fname string, mode os.FileMode) (io.WriteCloser, error) {
	os.Rename(fname, fname[:len(fname)-4]+".old")
	return os.OpenFile(fname, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, mode)
}

func (c Cert) saveFiles() error {
	fd, err := newFile(c.keyFile, 0600)
	if err != nil {
		return err
	}
	defer fd.Close()
	if err := acme.SaveKey(fd, c.Certificate.PrivateKey); err != nil {
		return err
	}
	fd, err = newFile(c.crtFile, 0644)
	if err != nil {
		return err
	}
	defer fd.Close()
	for _, crt := range c.Certificate.Certificate {
		if err := acme.SaveCert(fd, crt); err != nil {
			return err
		}
	}
	return nil
}

func scanFiles(dir string) ([]Cert, error) {
	var certs []Cert
	keys, err := filepath.Glob(path.Join(dir, "private", "*.key"))
	if err != nil {
		return nil, err
	}
	for _, k := range keys {
		c := filepath.Join(dir, "certs", filepath.Base(k[:len(k)-4])+".pem")
		crt, err := loadFiles(c, k)
		if err != nil {
			continue
		}
		certs = append(certs, crt)
	}
	return certs, nil
}