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

import (
	"crypto/rsa"
	"errors"
	"path"
	"strings"

	"github.com/BurntSushi/toml"
)

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 string
	Listen    string
	Provider  string
	Account   string
	Basedir   string
	KeySize   int
}

type provider struct {
	Directory string
}

type account struct {
	Mail    string
	Phone   string
	Key     string
	KeySize int
	key     *rsa.PrivateKey
}

type hook struct {
	CMD string
}

type desire struct {
	Provider string
	Account  string
	Altnames []string
	Key      string
	KeySize  int
	Cert     string
	Webroot  string
	Hooks    []string
	key      *rsa.PrivateKey `toml:"-"`
	account  *account
	provider *provider
}

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")
)

func LoadConfig(fname string) (*Config, error) {
	c := &Config{}
	_, err := toml.DecodeFile(fname, c)
	if err != nil {
		return nil, err
	}
	// apply defaults
	if c.Defaults.KeySize == 0 {
		c.Defaults.KeySize = 2048
	}
	for k, v := range c.Account {
		if v.KeySize == 0 {
			v.KeySize = c.Defaults.KeySize
		}
		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 Keychain interface {
	Path() string
	Size() int
}

func (d desire) Path() string  { return d.Key }
func (d desire) Size() int     { return d.KeySize }
func (a account) Path() string { return a.Key }
func (a account) Size() int    { return a.KeySize }