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package main
import (
"errors"
"io/ioutil"
"os/user"
"path"
"strings"
"time"
"github.com/dim13/acme"
"gopkg.in/yaml.v2"
)
const (
defKeySize = 2048
defGrace = time.Hour * 24 * 7 // one week
keyPath = "private"
crtPath = "certs"
)
type config struct {
Gracetime time.Duration
Listen string
ListenTLS string
BaseDir string
KeySize int
Directory string
Desire []desire
Hook map[string]string
}
type desire struct {
Mail string
Phone string
KeySize int
KeyFile string
Domain []domain
}
type domain struct {
Gracetime time.Duration
Altnames []string
KeySize int
KeyFile string
CrtFile string
Webroot string
Hook []string
}
var (
errNoAltNames = errors.New("no altnames specified")
errNoMail = errors.New("no mail specified")
)
func expandHome(p string) (string, error) {
if strings.HasPrefix(p, "~") {
usr, err := user.Current()
if err != nil {
return "", err
}
return path.Join(usr.HomeDir, p[1:]), nil
}
return p, nil
}
func LoadConfig(fname string) (*config, error) {
conf, err := ioutil.ReadFile(fname)
if err != nil {
return nil, err
}
c := new(config)
err = yaml.Unmarshal(conf, c)
if err != nil {
return nil, err
}
c.BaseDir, err = expandHome(c.BaseDir)
if err != nil {
return nil, err
}
// apply defaults
if c.Gracetime == 0 {
c.Gracetime = defGrace
}
if c.KeySize == 0 {
c.KeySize = defKeySize
}
if c.Directory == "" {
c.Directory = acme.LE1
}
for i, des := range c.Desire {
if des.KeySize == 0 {
des.KeySize = c.KeySize
}
if des.Mail == "" {
return nil, errNoMail
}
if des.KeyFile == "" {
des.KeyFile = des.Mail + ".key"
}
des.KeyFile = path.Join(c.BaseDir, keyPath, des.KeyFile)
c.Desire[i] = des
for i, dom := range des.Domain {
if dom.Gracetime == 0 {
dom.Gracetime = c.Gracetime
}
if dom.KeySize == 0 {
dom.KeySize = c.KeySize
}
if len(dom.Altnames) == 0 {
return nil, errNoAltNames
}
dom.Altnames = checkWWW(dom.Altnames)
if dom.KeyFile == "" {
dom.KeyFile = dom.Altnames[0] + ".key"
}
if dom.CrtFile == "" {
dom.CrtFile = dom.Altnames[0] + ".pem"
}
dom.KeyFile = path.Join(c.BaseDir, keyPath, dom.KeyFile)
dom.CrtFile = path.Join(c.BaseDir, crtPath, dom.CrtFile)
des.Domain[i] = dom
}
}
return c, nil
}
func checkWWW(altnames []string) []string {
ch := make(chan string)
go func(ch chan string, s []string) {
for _, an := range s {
if strings.HasPrefix(an, "www.") {
ch <- an[4:]
}
}
close(ch)
}(ch, altnames)
has := func(s string) bool {
for _, an := range altnames {
if an == s {
return true
}
}
return false
}
for d := range ch {
if !has(d) {
altnames = append(altnames, d)
}
}
return altnames
}
func (c config) dump() ([]byte, error) {
return yaml.Marshal(c)
}
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