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

import (
	"errors"
	"io/ioutil"
	"path"
	"strings"
	"time"

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

const defKeySize = 2048

type Config struct {
	Defaults defaults
	Provider map[string]provider
	Account  map[string]account
	Hook     map[string]hook
	Desire   map[string]desire
	Flow     []flow
}

type flow struct {
	Provider string
	Account  string
	Desire   string
}

type defaults struct {
	Gracetime time.Duration
	Listen    string
	ListenTLS string
	Provider  string
	Account   string
	Basedir   string
	KeySize   int
}

type provider struct {
	Directory string
	*acme.Provider
}

type account struct {
	Mail       string
	Phone      string
	KeySize    int
	Key        string
	registered bool
	*acme.Account
	acme.Contacts
}

type hook struct {
	CMD string
}

type desire struct {
	Provider string
	Account  string
	Altnames []string
	KeySize  int
	Key      string
	Cert     string
	Webroot  string
	Hooks    []string
	provider *provider
	account  *account
	*acme.Desire
}

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
	}
	// apply defaults
	if c.Defaults.KeySize == 0 {
		c.Defaults.KeySize = defKeySize
	}
	for k, v := range c.Account {
		if v.KeySize == 0 {
			v.KeySize = c.Defaults.KeySize
		}
		if v.Mail == "" {
			return nil, errNoMail
		}
		if v.Key == "" {
			return nil, errNoKey
		}
		if c.Defaults.Basedir != "" {
			v.Key = path.Join(c.Defaults.Basedir, v.Key)
		}
		c.Account[k] = v
	}
	for k, v := range c.Desire {
		if v.Provider == "" {
			if c.Defaults.Provider != "" {
				v.Provider = c.Defaults.Provider
			} else {
				return nil, errNoProvider
			}
		}
		//v.provider = c.Provider[v.Provider]
		if v.Account == "" {
			if c.Defaults.Account != "" {
				v.Account = c.Defaults.Account
			} else {
				return nil, errNoAccount
			}
		}
		//v.account = c.Account[v.Account]
		if v.KeySize == 0 {
			v.KeySize = c.Defaults.KeySize
		}
		if v.Key == "" {
			return nil, errNoKey
		}
		if v.Cert == "" {
			return nil, errNoCert
		}
		if c.Defaults.Basedir != "" {
			v.Key = path.Join(c.Defaults.Basedir, v.Key)
			v.Cert = path.Join(c.Defaults.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
}

type Gracetime struct{ time.Duration }

func (g *Gracetime) UnmarshalText(s []byte) error {
	var err error
	g.Duration, err = time.ParseDuration(string(s))
	return err
}