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package acme

import (
	"crypto/rsa"
	"errors"
	"io"
	"net/mail"
	"strings"

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

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

// Account ...
type Account struct {
	Contact Contacts        `json:"contact"`
	PrivKey *rsa.PrivateKey `json:"key"`
	signer  jose.Signer
	nonce   chan string
}

// NewAccount ...
func NewAccount(key *rsa.PrivateKey) (*Account, error) {
	return &Account{PrivKey: key}, 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 {
	Init(jose.NonceSource) error
	Sign([]byte) (io.Reader, error)
}

func (a *Account) Init(n jose.NonceSource) error {
	var err error
	a.signer, err = jose.NewSigner(jose.RS256, a.PrivKey)
	if err != nil {
		return err
	}
	a.signer.SetNonceSource(n)
	return nil
}

func (a *Account) Sign(msg []byte) (io.Reader, error) {
	if a.signer == nil {
		return nil, errors.New("init first")
	}
	obj, err := a.signer.Sign(msg)
	if err != nil {
		return nil, err
	}
	return strings.NewReader(obj.FullSerialize()), nil
}