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owner.go
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/
owner.go
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/*
* Copyright (C) 2018 The DNA Authors
* This file is part of The DNA library.
*
* The DNA is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The DNA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The DNA. If not, see <http://www.gnu.org/licenses/>.
*/
package ontid
import (
"bytes"
"errors"
"fmt"
"io"
"github.com/dnaproject2/DNA/common/log"
"github.com/dnaproject2/DNA/common/serialization"
"github.com/dnaproject2/DNA/core/states"
"github.com/dnaproject2/DNA/smartcontract/service/native"
"github.com/dnaproject2/DNA/smartcontract/service/native/utils"
)
type owner struct {
key []byte
revoked bool
}
func (this *owner) Serialize(w io.Writer) error {
if err := serialization.WriteVarBytes(w, this.key); err != nil {
return err
}
if err := serialization.WriteBool(w, this.revoked); err != nil {
return err
}
return nil
}
func (this *owner) Deserialize(r io.Reader) error {
v1, err := serialization.ReadVarBytes(r)
if err != nil {
return err
}
v2, err := serialization.ReadBool(r)
if err != nil {
return err
}
this.key = v1
this.revoked = v2
return nil
}
func getAllPk(srvc *native.NativeService, key []byte) ([]*owner, error) {
val, err := utils.GetStorageItem(srvc, key)
if err != nil {
return nil, fmt.Errorf("get storage error, %s", err)
}
if val == nil {
return nil, nil
}
buf := bytes.NewBuffer(val.Value)
owners := make([]*owner, 0)
for buf.Len() > 0 {
var t = new(owner)
err = t.Deserialize(buf)
if err != nil {
return nil, fmt.Errorf("deserialize owners error, %s", err)
}
owners = append(owners, t)
}
return owners, nil
}
func putAllPk(srvc *native.NativeService, key []byte, val []*owner) error {
var buf bytes.Buffer
for _, i := range val {
err := i.Serialize(&buf)
if err != nil {
return fmt.Errorf("serialize owner error, %s", err)
}
}
var v states.StorageItem
v.Value = buf.Bytes()
srvc.CacheDB.Put(key, v.ToArray())
return nil
}
func insertPk(srvc *native.NativeService, encID, pk []byte) (uint32, error) {
key := append(encID, FIELD_PK)
owners, err := getAllPk(srvc, key)
if err != nil {
owners = make([]*owner, 0)
}
size := len(owners)
if size >= 0xFFFFFFFF {
//FIXME currently the limit is for all the keys, including the
// revoked ones.
return 0, errors.New("reach the max limit, cannot add more keys")
}
owners = append(owners, &owner{pk, false})
err = putAllPk(srvc, key, owners)
if err != nil {
return 0, err
}
return uint32(size + 1), nil
}
func getPk(srvc *native.NativeService, encID []byte, index uint32) (*owner, error) {
key := append(encID, FIELD_PK)
owners, err := getAllPk(srvc, key)
if err != nil {
return nil, err
}
if index < 1 || index > uint32(len(owners)) {
return nil, errors.New("invalid key index")
}
return owners[index-1], nil
}
func findPk(srvc *native.NativeService, encID, pub []byte) (uint32, bool, error) {
key := append(encID, FIELD_PK)
owners, err := getAllPk(srvc, key)
if err != nil {
return 0, false, err
}
for i, v := range owners {
if bytes.Equal(pub, v.key) {
return uint32(i + 1), v.revoked, nil
}
}
return 0, false, nil
}
func revokePk(srvc *native.NativeService, encID, pub []byte) (uint32, error) {
key := append(encID, FIELD_PK)
owners, err := getAllPk(srvc, key)
if err != nil {
return 0, err
}
var index uint32 = 0
for i, v := range owners {
if bytes.Equal(pub, v.key) {
index = uint32(i + 1)
if v.revoked {
return index, errors.New("public key has already been revoked")
}
v.revoked = true
}
}
if index == 0 {
return 0, errors.New("revoke failed, public key not found")
}
err = putAllPk(srvc, key, owners)
if err != nil {
return 0, err
}
return index, nil
}
func isOwner(srvc *native.NativeService, encID, pub []byte) bool {
kID, revoked, err := findPk(srvc, encID, pub)
if err != nil {
log.Debug(err)
return false
}
return kID != 0 && !revoked
}