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contractContext.go
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contractContext.go
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package contract
import (
"errors"
"math/big"
"sort"
. "github.com/nknorg/nkn/common"
pg "github.com/nknorg/nkn/core/contract/program"
sig "github.com/nknorg/nkn/core/signature"
"github.com/nknorg/nkn/crypto"
_ "github.com/nknorg/nkn/errors"
"github.com/nknorg/nkn/util/log"
)
type ContractContext struct {
Data sig.SignableData
ProgramHashes []Uint160
Codes [][]byte
Parameters [][][]byte
MultiPubkeyPara [][]PubkeyParameter
//temp index for multi sig
tempParaIndex int
}
func NewContractContext(data sig.SignableData) *ContractContext {
programHashes, _ := data.GetProgramHashes() //TODO: check error
hashLen := len(programHashes)
return &ContractContext{
Data: data,
ProgramHashes: programHashes,
Codes: make([][]byte, hashLen),
Parameters: make([][][]byte, hashLen),
MultiPubkeyPara: make([][]PubkeyParameter, hashLen),
tempParaIndex: 0,
}
}
func (ctx *ContractContext) Add(contract *Contract, index int, parameter []byte) error {
i := ctx.GetIndex(contract.ProgramHash)
if i < 0 {
return errors.New("Program Hash is not exist")
}
if ctx.Codes[i] == nil {
ctx.Codes[i] = contract.Code
}
if ctx.Parameters[i] == nil {
ctx.Parameters[i] = make([][]byte, len(contract.Parameters))
}
ctx.Parameters[i][index] = parameter
return nil
}
func (ctx *ContractContext) AddContract(contract *Contract, pubkey *crypto.PubKey, parameter []byte) error {
if contract.GetType() == MultiSigContract {
index := ctx.GetIndex(contract.ProgramHash)
if index < 0 {
log.Error("The program hash is not exist.")
return errors.New("The program hash is not exist.")
}
if ctx.Codes[index] == nil {
ctx.Codes[index] = contract.Code
}
if ctx.Parameters[index] == nil {
ctx.Parameters[index] = make([][]byte, len(contract.Parameters))
}
if err := ctx.Add(contract, ctx.tempParaIndex, parameter); err != nil {
return err
}
ctx.tempParaIndex++
//all paramenters added, sort the parameters
if ctx.tempParaIndex == len(contract.Parameters) {
ctx.tempParaIndex = 0
}
} else {
//add non multi sig contract
index := -1
for i := 0; i < len(contract.Parameters); i++ {
if contract.Parameters[i] == Signature {
if index >= 0 {
return errors.New("Contract Parameters are not supported.")
} else {
index = i
}
}
}
return ctx.Add(contract, index, parameter)
}
return nil
}
func (ctx *ContractContext) AddSignatureToMultiList(contractIndex int, contract *Contract, pubkey *crypto.PubKey, parameter []byte) error {
if ctx.MultiPubkeyPara[contractIndex] == nil {
ctx.MultiPubkeyPara[contractIndex] = make([]PubkeyParameter, len(contract.Parameters))
}
pk, err := pubkey.EncodePoint(true)
if err != nil {
return err
}
pubkeyPara := PubkeyParameter{
PubKey: BytesToHexString(pk),
Parameter: BytesToHexString(parameter),
}
ctx.MultiPubkeyPara[contractIndex] = append(ctx.MultiPubkeyPara[contractIndex], pubkeyPara)
return nil
}
func (ctx *ContractContext) AddMultiSignatures(index int, contract *Contract, pubkey *crypto.PubKey, parameter []byte) error {
pkIndexs, err := ctx.ParseContractPubKeys(contract)
if err != nil {
return errors.New("Contract Parameters are not supported.")
}
paraIndexs := []ParameterIndex{}
for _, pubkeyPara := range ctx.MultiPubkeyPara[index] {
pubKeyBytes, err := HexStringToBytes(pubkeyPara.Parameter)
if err != nil {
return errors.New("Contract AddContract pubKeyBytes HexToBytes failed.")
}
paraIndex := ParameterIndex{
Parameter: pubKeyBytes,
Index: pkIndexs[pubkeyPara.PubKey],
}
paraIndexs = append(paraIndexs, paraIndex)
}
//sort parameter by Index
sort.Sort(sort.Reverse(ParameterIndexSlice(paraIndexs)))
//generate sorted parameter list
for i, paraIndex := range paraIndexs {
if err := ctx.Add(contract, i, paraIndex.Parameter); err != nil {
return err
}
}
ctx.MultiPubkeyPara[index] = nil
return nil
}
func (ctx *ContractContext) ParseContractPubKeys(contract *Contract) (map[string]int, error) {
pubkeyIndex := make(map[string]int)
Index := 0
//parse contract's pubkeys
i := 0
switch contract.Code[i] {
case 1:
i += 2
break
case 2:
i += 3
break
}
for contract.Code[i] == 33 {
i++
//pubkey, err := crypto.DecodePoint(contract.Code[i:33])
//if err != nil {
// return nil, errors.New("[Contract],AddContract DecodePoint failed.")
//}
//add to parameter index
pubkeyIndex[BytesToHexString(contract.Code[i:33])] = Index
i += 33
Index++
}
return pubkeyIndex, nil
}
func (ctx *ContractContext) GetIndex(programHash Uint160) int {
for i := 0; i < len(ctx.ProgramHashes); i++ {
if ctx.ProgramHashes[i] == programHash {
return i
}
}
return -1
}
func (ctx *ContractContext) GetPrograms() []*pg.Program {
if !ctx.IsCompleted() {
return nil
}
programs := make([]*pg.Program, len(ctx.Parameters))
for i := 0; i < len(ctx.Codes); i++ {
sb := pg.NewProgramBuilder()
for _, parameter := range ctx.Parameters[i] {
if len(parameter) <= 2 {
sb.PushNumber(new(big.Int).SetBytes(parameter))
} else {
sb.PushData(parameter)
}
}
programs[i] = &pg.Program{
Code: ctx.Codes[i],
Parameter: sb.ToArray(),
}
}
return programs
}
func (ctx *ContractContext) IsCompleted() bool {
for _, p := range ctx.Parameters {
if p == nil {
return false
}
for _, pp := range p {
if pp == nil {
return false
}
}
}
return true
}