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

import (
	"crypto/rsa"
	"crypto/x509"
	"errors"
	"os"
	"path"
	"strings"
	"time"

	"dim13.org/acme"

	"github.com/BurntSushi/toml"
)

const defKeySize = 2048

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

type defaults struct {
	Gracetime duration
	Listen    string
	ListenTLS string
	Provider  string
	Account   string
	Basedir   string
	Size      int
}

type provider struct {
	Directory string
}

type account struct {
	Mail          string
	Phone         string
	Size          int
	Key           string
	key           *rsa.PrivateKey
	account       *acme.Account
	needsRegister bool
}

type hook struct {
	CMD string
}

type desire struct {
	Provider     string
	Account      string
	Altnames     []string
	Size         int
	Key          string
	Cert         string
	Webroot      string
	Hooks        []string
	provider     *provider
	account      *account
	key          *rsa.PrivateKey
	chain        []*x509.Certificate
	needsNewCert bool
}

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{}
	_, err := toml.DecodeFile(fname, c)
	if err != nil {
		return nil, err
	}
	// apply defaults
	if c.Defaults.Size == 0 {
		c.Defaults.Size = defKeySize
	}
	if c.Defaults.Listen == "" {
		c.Defaults.Listen = "localhost:8080"
	}
	if c.Defaults.ListenTLS == "" {
		c.Defaults.ListenTLS = c.Defaults.Listen
	}
	for k, v := range c.Account {
		if v.Size == 0 {
			v.Size = c.Defaults.Size
		}
		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.Size == 0 {
			v.Size = c.Defaults.Size
		}
		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 PrivKey interface {
	KeyPath() string
	KeySize() int
	HasKey() bool
}

type Cert interface {
	CertPath() string
	HasCert() bool
}

func exists(fname string) bool {
	if _, err := os.Stat(fname); os.IsNotExist(err) {
		return false
	}
	return true
}

func (d desire) CertPath() string { return d.Cert }
func (d desire) KeyPath() string  { return d.Key }
func (d desire) KeySize() int     { return d.Size }
func (d desire) HasKey() bool     { return exists(d.Key) }
func (d desire) HasCert() bool    { return exists(d.Cert) }

func (a account) KeyPath() string { return a.Key }
func (a account) KeySize() int    { return a.Size }
func (a account) HasKey() bool    { return exists(a.Key) }

type duration struct{ time.Duration }

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