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path: root/cmd/acme/config.go
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package main

import (
	"crypto/x509"
	"errors"
	"io/ioutil"
	"os/user"
	"path"
	"strings"
	"time"

	"dim13.org/acme"
	"gopkg.in/yaml.v2"
)

const (
	defKeySize = 2048
	day        = time.Hour * 24
	week       = day * 7
	defGrace   = week
	keyPath    = "private"
	crtPath    = "certs"
)

type Config struct {
	Gracetime time.Duration
	Listen    string
	ListenTLS string
	BaseDir   string
	KeySize   int
	Provider  []provider
	Hook      map[string]string
}

type provider struct {
	Directory string
	Account   []account
}

type account struct {
	Mail    string
	Phone   string
	KeySize int
	KeyFile string
	Domain  []domain
}

type domain struct {
	Altnames []string
	KeySize  int
	KeyFile  string
	CrtFile  string
	Webroot  string
	Hook     []string
}

var (
	errNoKey      = errors.New("no key file specified")
	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 p, 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
	}

	replace := func(s string) string { return strings.Replace(s, ".", "_", -1) }

	for i, pro := range c.Provider {
		if pro.Directory == "" {
			pro.Directory = acme.LE1
		}
		c.Provider[i] = pro
		for i, acc := range pro.Account {
			if acc.KeySize == 0 {
				acc.KeySize = c.KeySize
			}
			if acc.Mail == "" {
				return nil, errNoMail
			}
			if acc.KeyFile == "" {
				return nil, errNoKey
			}
			if c.BaseDir != "" {
				acc.KeyFile = path.Join(c.BaseDir, acc.KeyFile)
			}
			pro.Account[i] = acc
			for i, dom := range acc.Domain {
				if dom.KeySize == 0 {
					dom.KeySize = c.KeySize
				}
				if len(dom.Altnames) == 0 {
					return nil, errNoAltNames
				}
				dom.Altnames = checkWWW(dom.Altnames)
				d := dom.Altnames[0]
				if dom.KeyFile == "" {
					dom.KeyFile = path.Join(keyPath, replace(d)+".key")
				}
				if dom.CrtFile == "" {
					dom.CrtFile = path.Join(crtPath, replace(d)+".pem")
				}
				if c.BaseDir != "" {
					dom.KeyFile = path.Join(c.BaseDir, dom.KeyFile)
					dom.CrtFile = path.Join(c.BaseDir, dom.CrtFile)
				}
				acc.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) renew(cert *x509.Certificate) bool {
	return time.Now().Add(c.Gracetime).After(cert.NotAfter)
}