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package identity
import (
"bytes"
"encoding/json"
"fmt"
"io"
"strings"
"time"
"github.com/pkg/errors"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/packet"
"github.com/MichaelMure/git-bug/repository"
)
var errNoPrivateKey = fmt.Errorf("no private key")
type Key struct {
public *packet.PublicKey
private *packet.PrivateKey
}
// GenerateKey generate a keypair (public+private)
// The type and configuration of the key is determined by the default value in go's OpenPGP.
func GenerateKey() *Key {
entity, err := openpgp.NewEntity("", "", "", &packet.Config{
// The armored format doesn't include the creation time, which makes the round-trip data not being fully equal.
// We don't care about the creation time so we can set it to the zero value.
Time: func() time.Time {
return time.Time{}
},
})
if err != nil {
panic(err)
}
return &Key{
public: entity.PrimaryKey,
private: entity.PrivateKey,
}
}
// generatePublicKey generate only a public key (only useful for testing)
// See GenerateKey for the details.
func generatePublicKey() *Key {
k := GenerateKey()
k.private = nil
return k
}
func (k *Key) Public() *packet.PublicKey {
return k.public
}
func (k *Key) Private() *packet.PrivateKey {
return k.private
}
func (k *Key) Validate() error {
if k.public == nil {
return fmt.Errorf("nil public key")
}
if !k.public.CanSign() {
return fmt.Errorf("public key can't sign")
}
if k.private != nil {
if !k.private.CanSign() {
return fmt.Errorf("private key can't sign")
}
}
return nil
}
func (k *Key) Clone() *Key {
clone := &Key{}
pub := *k.public
clone.public = &pub
if k.private != nil {
priv := *k.private
clone.private = &priv
}
return clone
}
func (k *Key) MarshalJSON() ([]byte, error) {
// Serialize only the public key, in the armored format.
var buf bytes.Buffer
w, err := armor.Encode(&buf, openpgp.PublicKeyType, nil)
if err != nil {
return nil, err
}
err = k.public.Serialize(w)
if err != nil {
return nil, err
}
err = w.Close()
if err != nil {
return nil, err
}
return json.Marshal(buf.String())
}
func (k *Key) UnmarshalJSON(data []byte) error {
// De-serialize only the public key, in the armored format.
var armored string
err := json.Unmarshal(data, &armored)
if err != nil {
return err
}
block, err := armor.Decode(strings.NewReader(armored))
if err == io.EOF {
return fmt.Errorf("no armored data found")
}
if err != nil {
return err
}
if block.Type != openpgp.PublicKeyType {
return fmt.Errorf("invalid key type")
}
p, err := packet.Read(block.Body)
if err != nil {
return errors.Wrap(err, "failed to read public key packet")
}
public, ok := p.(*packet.PublicKey)
if !ok {
return errors.New("got no packet.publicKey")
}
// The armored format doesn't include the creation time, which makes the round-trip data not being fully equal.
// We don't care about the creation time so we can set it to the zero value.
public.CreationTime = time.Time{}
k.public = public
return nil
}
func (k *Key) loadPrivate(repo repository.RepoKeyring) error {
item, err := repo.Keyring().Get(k.public.KeyIdString())
if err == repository.ErrKeyringKeyNotFound {
return errNoPrivateKey
}
if err != nil {
return err
}
block, err := armor.Decode(bytes.NewReader(item.Data))
if err == io.EOF {
return fmt.Errorf("no armored data found")
}
if err != nil {
return err
}
if block.Type != openpgp.PrivateKeyType {
return fmt.Errorf("invalid key type")
}
p, err := packet.Read(block.Body)
if err != nil {
return errors.Wrap(err, "failed to read private key packet")
}
private, ok := p.(*packet.PrivateKey)
if !ok {
return errors.New("got no packet.privateKey")
}
// The armored format doesn't include the creation time, which makes the round-trip data not being fully equal.
// We don't care about the creation time so we can set it to the zero value.
private.CreationTime = time.Time{}
k.private = private
return nil
}
// ensurePrivateKey attempt to load the corresponding private key if it is not loaded already.
// If no private key is found, returns errNoPrivateKey
func (k *Key) ensurePrivateKey(repo repository.RepoKeyring) error {
if k.private != nil {
return nil
}
return k.loadPrivate(repo)
}
func (k *Key) storePrivate(repo repository.RepoKeyring) error {
var buf bytes.Buffer
w, err := armor.Encode(&buf, openpgp.PrivateKeyType, nil)
if err != nil {
return err
}
err = k.private.Serialize(w)
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return repo.Keyring().Set(repository.Item{
Key: k.public.KeyIdString(),
Data: buf.Bytes(),
})
}
func (k *Key) PGPEntity() *openpgp.Entity {
return &openpgp.Entity{
PrimaryKey: k.public,
PrivateKey: k.private,
}
}
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