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package acme

import (
	"crypto"
	"crypto/rsa"
	"encoding/base64"
	"io"
	"net/mail"
	"os"
	"path"
	"strings"

	"github.com/square/go-jose"
)

// KeySize is a default RSA key size
const KeySize = 2048

// Account ...
type Account struct {
	contact Contacts
	key     *rsa.PrivateKey
	signer  jose.Signer
	nonce   chan string
}

// NewAccount ...
func NewAccount(key *rsa.PrivateKey) (*Account, error) {
	signer, err := jose.NewSigner(jose.RS256, key)
	if err != nil {
		return nil, err
	}
	return &Account{key: key, signer: signer}, nil
}

func (a *Account) AddMail(email string) error {
	m, err := mail.ParseAddress(email)
	if err != nil {
		return err
	}
	a.contact = append(a.contact, Mail(m.Address))
	return nil
}

func (a *Account) AddPhone(phone string) error {
	if ph := strings.TrimSpace(phone); ph != "" {
		a.contact = append(a.contact, Phone(ph))
	}
	return nil
}

// Signer describes a signing interface
type Signer interface {
	Sign([]byte, jose.NonceSource) (io.Reader, error)
}

type Thumber interface {
	Thumb() (string, error)
}

type ThumbSigner interface {
	Signer
	Thumber
}

// Sign implements Signer interface
func (a *Account) Sign(msg []byte, n jose.NonceSource) (io.Reader, error) {
	a.signer.SetNonceSource(n)
	obj, err := a.signer.Sign(msg)
	if err != nil {
		return nil, err
	}
	return strings.NewReader(obj.FullSerialize()), nil
}

func (a *Account) Thumb() (string, error) {
	k := &jose.JsonWebKey{Key: a.key.Public(), Algorithm: "RSA"}
	thumb, err := k.Thumbprint(crypto.SHA256)
	if err != nil {
		return "", err
	}
	return base64.RawURLEncoding.EncodeToString(thumb), nil
}

func KeyAuthorization(s Thumber, token string) (string, error) {
	thumb, err := s.Thumb()
	if err != nil {
		return "", err
	}
	return token + "." + thumb, nil
}

func (a *Account) Save(fname string) error {
	if err := os.MkdirAll(path.Dir(fname), 0700); err != nil {
		return err
	}
	flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC
	fd, err := os.OpenFile(fname, flags, 0600)
	if err != nil {
		return err
	}
	defer fd.Close()
	return SaveKey(fd, a.key)
}