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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"

	"gopkg.in/yaml.v2"
)

const defKeySize = 2048

type Config struct {
	Gracetime time.Duration
	Listen    string
	ListenTLS string
	Basedir   string
	KeySize   int
	Provider  map[string]string
	Account   map[string]account
	Desire    map[string]desire
	Hook      map[string]string
}

type account struct {
	Mail    string
	Phone   string
	KeySize int
	Key     string
}

type desire struct {
	Provider string
	Account  string
	Altnames []string
	KeySize  int
	Key      string
	Cert     string
	Webroot  string
	Hook     []string
}

var (
	errNoProvider = errors.New("no provider specified")
	errNoAccount  = errors.New("no account specified")
	errNoKey      = errors.New("no key specified")
	errNoCert     = errors.New("no cert specified")
	errNoAltNames = errors.New("no altnames specified")
	errNoMail     = errors.New("no mail specified")
)

func LoadConfig(fname string) (*Config, error) {
	c := &Config{}
	conf, err := ioutil.ReadFile(fname)
	if err != nil {
		return nil, err
	}
	err = yaml.Unmarshal(conf, c)
	if err != nil {
		return nil, err
	}
	if c.Basedir != "" && strings.HasPrefix(c.Basedir, "~") {
		usr, err := user.Current()
		if err != nil {
			return nil, err
		}
		c.Basedir = path.Join(usr.HomeDir, c.Basedir[1:])
	}
	// apply defaults
	if c.KeySize == 0 {
		c.KeySize = defKeySize
	}
	for k, v := range c.Account {
		if v.KeySize == 0 {
			v.KeySize = c.KeySize
		}
		if v.Mail == "" {
			return nil, errNoMail
		}
		if v.Key == "" {
			return nil, errNoKey
		}
		if c.Basedir != "" {
			v.Key = path.Join(c.Basedir, v.Key)
		}
		c.Account[k] = v
	}
	for k, v := range c.Desire {
		if v.Provider == "" {
			return nil, errNoProvider
		}
		if v.Account == "" {
			return nil, errNoAccount
		}
		if v.KeySize == 0 {
			v.KeySize = c.KeySize
		}
		if v.Key == "" {
			return nil, errNoKey
		}
		if v.Cert == "" {
			return nil, errNoCert
		}
		if c.Basedir != "" {
			v.Key = path.Join(c.Basedir, v.Key)
			v.Cert = path.Join(c.Basedir, v.Cert)
		}
		switch len(v.Altnames) {
		case 0:
			return nil, errNoAltNames
		case 1:
			an := v.Altnames[0]
			if strings.HasPrefix(an, "www.") {
				v.Altnames = append(v.Altnames, an[4:])
			}
		}
		c.Desire[k] = v
	}
	return c, nil
}