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name.go
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name.go
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package name
import (
"bytes"
"encoding/binary"
"fmt"
"strings"
"github.com/aergoio/aergo/state"
"github.com/aergoio/aergo/types"
)
var prefix = []byte("name")
type NameMap struct {
Version byte
Owner []byte
Destination []byte
}
func CreateName(scs *state.ContractState, tx *types.TxBody, sender, receiver *state.V, name string) error {
amount := tx.GetAmountBigInt()
sender.SubBalance(amount)
receiver.AddBalance(amount)
return createName(scs, []byte(name), sender.ID())
}
func createName(scs *state.ContractState, name []byte, owner []byte) error {
// return setAddress(scs, name, owner)
return registerOwner(scs, name, owner, owner)
}
//UpdateName is avaliable after bid implement
func UpdateName(bs *state.BlockState, scs *state.ContractState, tx *types.TxBody,
sender, receiver *state.V, name, to string) error {
amount := tx.GetAmountBigInt()
if len(getAddress(scs, []byte(name))) <= types.NameLength {
return fmt.Errorf("%s is not created yet", string(name))
}
destination, _ := types.DecodeAddress(to)
destination = GetAddress(scs, destination)
sender.SubBalance(amount)
receiver.AddBalance(amount)
contract, err := bs.StateDB.OpenContractStateAccount(types.ToAccountID(destination))
if err != nil {
return types.ErrTxInvalidRecipient
}
creator, err := contract.GetData([]byte("Creator"))
if err != nil {
return err
}
ownerAddr := destination
if creator != nil {
ownerAddr, err = types.DecodeAddress(string(creator))
if err != nil {
return types.ErrTxInvalidRecipient
}
}
return updateName(scs, []byte(name), ownerAddr, destination)
}
func updateName(scs *state.ContractState, name []byte, owner []byte, to []byte) error {
//return setAddress(scs, name, to)
return registerOwner(scs, name, owner, to)
}
//Resolve is resolve name for chain
func Resolve(bs *state.BlockState, name []byte) []byte {
if len(name) == types.AddressLength ||
bytes.Equal(name, []byte(types.AergoSystem)) ||
bytes.Equal(name, []byte(types.AergoName)) {
return name
}
scs, err := openContract(bs)
if err != nil {
return name
}
return getAddress(scs, name)
}
func openContract(bs *state.BlockState) (*state.ContractState, error) {
v, err := bs.GetAccountStateV([]byte("aergo.name"))
if err != nil {
return nil, err
}
scs, err := bs.StateDB.OpenContractState(v.AccountID(), v.State())
if err != nil {
return nil, err
}
return scs, nil
}
//GetAddress is resolve name for mempool
func GetAddress(scs *state.ContractState, name []byte) []byte {
if len(name) == types.AddressLength ||
bytes.Equal(name, []byte(types.AergoSystem)) ||
bytes.Equal(name, []byte(types.AergoName)) {
return name
}
return getAddress(scs, name)
}
func getAddress(scs *state.ContractState, name []byte) []byte {
nameMap := getNameMap(scs, name, true)
if nameMap != nil {
return nameMap.Destination
}
return nil
}
func GetOwner(scs *state.ContractState, name []byte) []byte {
return getOwner(scs, name, true)
}
func getOwner(scs *state.ContractState, name []byte, useInitial bool) []byte {
nameMap := getNameMap(scs, name, useInitial)
if nameMap != nil {
return nameMap.Owner
}
return nil
}
func getNameMap(scs *state.ContractState, name []byte, useInitial bool) *NameMap {
lowerCaseName := strings.ToLower(string(name))
key := append(prefix, lowerCaseName...)
var err error
var ownerdata []byte
if useInitial {
ownerdata, err = scs.GetInitialData(key)
} else {
ownerdata, err = scs.GetData(key)
}
if err != nil {
return nil
}
return deserializeNameMap(ownerdata)
}
func registerOwner(scs *state.ContractState, name, owner, destination []byte) error {
nameMap := &NameMap{Version: 1, Owner: owner, Destination: destination}
return setNameMap(scs, name, nameMap)
}
func setNameMap(scs *state.ContractState, name []byte, n *NameMap) error {
lowerCaseName := strings.ToLower(string(name))
key := append(prefix, lowerCaseName...)
return scs.SetData(key, serializeNameMap(n))
}
func serializeNameMap(n *NameMap) []byte {
var ret []byte
if n != nil {
ret = append(ret, n.Version)
buf := make([]byte, 8)
binary.LittleEndian.PutUint64(buf, uint64(len(n.Owner)))
ret = append(ret, buf...)
ret = append(ret, n.Owner...)
binary.LittleEndian.PutUint64(buf, uint64(len(n.Destination)))
ret = append(ret, buf...)
ret = append(ret, n.Destination...)
}
return ret
}
func deserializeNameMap(data []byte) *NameMap {
if data != nil {
version := data[0]
if version != 1 {
panic("could not deserializeOwner, not supported version")
}
offset := 1
next := offset + 8
sizeOfAddr := binary.LittleEndian.Uint64(data[offset:next])
offset = next
next = offset + int(sizeOfAddr)
owner := data[offset:next]
offset = next
next = offset + 8
sizeOfDest := binary.LittleEndian.Uint64(data[offset:next])
offset = next
next = offset + int(sizeOfDest)
destination := data[offset:next]
return &NameMap{
Version: version,
Owner: owner,
Destination: destination,
}
}
return nil
}
/*
version 0
func setAddress(scs *state.ContractState, name, address []byte) error {
owner := &Owner{Address: address}
return setOwner(scs, name, owner)
}
func serializeOwner(owner *Owner) []byte {
if owner != nil {
return owner.Address
}
return nil
}
func deserializeOwner(data []byte) *Owner {
if data != nil {
return &Owner{Address: data}
}
return nil
}
*/