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package acme

import (
	"crypto"
	"crypto/rand"
	"crypto/rsa"
	"encoding/base64"
	"encoding/json"
	"io"
	"strings"

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

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

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

func LoadAccount(fname string) (*Account, error) {
	key, err := LoadKeyFile(fname)
	if err != nil {
		return nil, err
	}
	return newAccount(key)
}

func NewAccount(size int) (*Account, error) {
	key, err := rsa.GenerateKey(rand.Reader, size)
	if err != nil {
		return nil, err
	}
	return newAccount(key)
}

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
}

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

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

type ThumbSigner interface {
	Signer
	Thumber
}

// Sign implements Signer interface
func (a *Account) Sign(v interface{}, n jose.NonceSource) (io.Reader, error) {
	msg, err := json.Marshal(v)
	if err != nil {
		return nil, err
	}
	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) SaveKey(fname string) error {
	fd, err := CreatePrivFile(fname)
	if err != nil {
		return err
	}
	defer fd.Close()
	return SaveKey(fd, a.key)
}