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

import (
	"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
	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 (
	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
	}
	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
}