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decoder.go
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decoder.go
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package key
import (
"github.com/pkg/errors"
"github.com/spikeekips/mitum/util/encoder"
"github.com/spikeekips/mitum/util/hint"
)
// KeyDecoder is basic unmarshaler for Keys. It can unmarshal Privatekey and
// publickey.
type KeyDecoder struct {
ty hint.Type
b []byte
}
// Encode is used with encoder.Encoder.
// var de struct {
// Key KeyDecoder
// }
//
// err := json.Unmarshal(b, &de)
// if err != nil {
// return err
// }
//
// enc := jsonenc.NewEncoder()
// uk, err := de.Key.Encode(enc)
// if err != nil {
// return err
// }
//
// priv, ok := uk.(Privtekey)
// pub, ok := uk.(Publickey)
func (kd *KeyDecoder) Encode(enc encoder.Encoder) (Key, error) {
if len(kd.b) < 1 {
return nil, nil
}
return decodeKey(kd.b, kd.ty, enc)
}
func (kd KeyDecoder) Type() hint.Type {
return kd.ty
}
func (kd KeyDecoder) Body() []byte {
return kd.b
}
// PrivatekeyDecoder is basic unmarshaler for Privatekey.
type PrivatekeyDecoder struct {
KeyDecoder
}
func (kd *PrivatekeyDecoder) Encode(enc encoder.Encoder) (Privatekey, error) {
k, err := kd.KeyDecoder.Encode(enc)
switch {
case err != nil:
return nil, err
case k == nil:
return nil, nil
}
priv, ok := k.(Privatekey)
if !ok {
return nil, errors.Errorf("not Privatekey: %T", k)
}
return priv, nil
}
// PublickeyDecoder is basic unmarshaler for Privatekey.
type PublickeyDecoder struct {
KeyDecoder
}
func (kd *PublickeyDecoder) Encode(enc encoder.Encoder) (Publickey, error) {
k, err := kd.KeyDecoder.Encode(enc)
switch {
case err != nil:
return nil, err
case k == nil:
return nil, nil
}
pub, ok := k.(Publickey)
if !ok {
return nil, errors.Errorf("not Publickey: %T", k)
}
return pub, nil
}
// DecodeKeyFromString parses and decodes Key from string.
func DecodeKeyFromString(s string, enc encoder.Encoder) (Key, error) {
if len(s) < 1 {
return nil, nil
}
p, ty, err := hint.ParseFixedTypedString(s, KeyTypeSize)
if err != nil {
return nil, errors.Wrapf(err, "failed to decode key, %q", s)
}
return decodeKey([]byte(p), ty, enc)
}
func DecodePrivatekeyFromString(s string, enc encoder.Encoder) (Privatekey, error) {
k, err := DecodeKeyFromString(s, enc)
switch {
case err != nil:
return nil, errors.Wrapf(err, "failed to decode privatekey, %q", s)
case k == nil:
return nil, nil
}
priv, ok := k.(Privatekey)
if !ok {
return nil, errors.Errorf("not privatekey: %T", k)
}
return priv, nil
}
func DecodePublickeyFromString(s string, enc encoder.Encoder) (Publickey, error) {
k, err := DecodeKeyFromString(s, enc)
switch {
case err != nil:
return nil, errors.Wrapf(err, "failed to decode publickey, %q", s)
case k == nil:
return nil, nil
}
pub, ok := k.(Publickey)
if !ok {
return nil, errors.Errorf("not publickey: %T", k)
}
return pub, nil
}
func decodeKey(b []byte, ty hint.Type, enc encoder.Encoder) (Key, error) {
var k Key
err := encoder.DecodeWithHint(b, enc, hint.NewHint(ty, ""), &k)
return k, err
}