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https://github.com/nspcc-dev/neo-go.git
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44901ca867
It is needed to be able to create Contracts from the outside.
265 lines
6.5 KiB
Go
265 lines
6.5 KiB
Go
package wallet
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/encoding/address"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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// Account represents a NEO account. It holds the private and public key
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// along with some metadata.
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type Account struct {
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// NEO private key.
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privateKey *keys.PrivateKey
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// NEO public key.
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publicKey []byte
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// Account import file.
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wif string
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// NEO public address.
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Address string `json:"address"`
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// Encrypted WIF of the account also known as the key.
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EncryptedWIF string `json:"key"`
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// Label is a label the user had made for this account.
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Label string `json:"label"`
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// Contract is a Contract object which describes the details of the contract.
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// This field can be null (for watch-only address).
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Contract *Contract `json:"contract"`
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// Indicates whether the account is locked by the user.
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// the client shouldn't spend the funds in a locked account.
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Locked bool `json:"lock"`
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// Indicates whether the account is the default change account.
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Default bool `json:"isDefault"`
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}
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// Contract represents a subset of the smartcontract to embed in the
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// Account so it's NEP-6 compliant.
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type Contract struct {
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// Script of the contract deployed on the blockchain.
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Script []byte `json:"script"`
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// A list of parameters used deploying this contract.
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Parameters []ContractParam `json:"parameters"`
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// Indicates whether the contract has been deployed to the blockchain.
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Deployed bool `json:"deployed"`
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}
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// contract is an intermediate struct used for json unmarshalling.
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type contract struct {
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// Script is a hex-encoded script of the contract.
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Script string `json:"script"`
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// A list of parameters used deploying this contract.
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Parameters []ContractParam `json:"parameters"`
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// Indicates whether the contract has been deployed to the blockchain.
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Deployed bool `json:"deployed"`
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}
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// ContractParam is a descriptor of a contract parameter
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// containing type and optional name.
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type ContractParam struct {
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Name string `json:"name"`
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Type smartcontract.ParamType `json:"type"`
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}
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// ScriptHash returns the hash of contract's script.
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func (c Contract) ScriptHash() util.Uint160 {
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return hash.Hash160(c.Script)
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}
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// MarshalJSON implements json.Marshaler interface.
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func (c Contract) MarshalJSON() ([]byte, error) {
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var cc contract
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cc.Script = hex.EncodeToString(c.Script)
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cc.Parameters = c.Parameters
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cc.Deployed = c.Deployed
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return json.Marshal(cc)
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}
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// UnmarshalJSON implements json.Unmarshaler interface.
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func (c *Contract) UnmarshalJSON(data []byte) error {
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var cc contract
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if err := json.Unmarshal(data, &cc); err != nil {
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return err
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}
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script, err := hex.DecodeString(cc.Script)
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if err != nil {
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return err
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}
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c.Script = script
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c.Parameters = cc.Parameters
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c.Deployed = cc.Deployed
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return nil
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}
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// NewAccount creates a new Account with a random generated PrivateKey.
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func NewAccount() (*Account, error) {
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priv, err := keys.NewPrivateKey()
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if err != nil {
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return nil, err
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}
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return newAccountFromPrivateKey(priv), nil
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}
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// SignTx signs transaction t and updates it's Witnesses.
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func (a *Account) SignTx(t *transaction.Transaction) error {
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if a.privateKey == nil {
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return errors.New("account is not unlocked")
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}
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data := t.GetSignedPart()
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sign := a.privateKey.Sign(data)
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t.Scripts = append(t.Scripts, transaction.Witness{
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InvocationScript: append([]byte{byte(opcode.PUSHBYTES64)}, sign...),
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VerificationScript: a.getVerificationScript(),
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})
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return nil
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}
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func (a *Account) getVerificationScript() []byte {
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if a.Contract != nil {
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return a.Contract.Script
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}
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return a.PrivateKey().PublicKey().GetVerificationScript()
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}
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// Decrypt decrypts the EncryptedWIF with the given passphrase returning error
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// if anything goes wrong.
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func (a *Account) Decrypt(passphrase string) error {
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var err error
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if a.EncryptedWIF == "" {
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return errors.New("no encrypted wif in the account")
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}
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a.privateKey, err = keys.NEP2Decrypt(a.EncryptedWIF, passphrase)
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if err != nil {
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return err
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}
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a.publicKey = a.privateKey.PublicKey().Bytes()
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a.wif = a.privateKey.WIF()
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return nil
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}
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// Encrypt encrypts the wallet's PrivateKey with the given passphrase
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// under the NEP-2 standard.
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func (a *Account) Encrypt(passphrase string) error {
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wif, err := keys.NEP2Encrypt(a.privateKey, passphrase)
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if err != nil {
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return err
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}
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a.EncryptedWIF = wif
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return nil
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}
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// PrivateKey returns private key corresponding to the account.
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func (a *Account) PrivateKey() *keys.PrivateKey {
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return a.privateKey
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}
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// NewAccountFromWIF creates a new Account from the given WIF.
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func NewAccountFromWIF(wif string) (*Account, error) {
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privKey, err := keys.NewPrivateKeyFromWIF(wif)
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if err != nil {
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return nil, err
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}
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return newAccountFromPrivateKey(privKey), nil
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}
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// NewAccountFromEncryptedWIF creates a new Account from the given encrypted WIF.
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func NewAccountFromEncryptedWIF(wif string, pass string) (*Account, error) {
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priv, err := keys.NEP2Decrypt(wif, pass)
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if err != nil {
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return nil, err
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}
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a := newAccountFromPrivateKey(priv)
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a.EncryptedWIF = wif
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return a, nil
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}
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// ConvertMultisig sets a's contract to multisig contract with m sufficient signatures.
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func (a *Account) ConvertMultisig(m int, pubs []*keys.PublicKey) error {
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var found bool
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for i := range pubs {
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if bytes.Equal(a.publicKey, pubs[i].Bytes()) {
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found = true
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break
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}
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}
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if !found {
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return errors.New("own public key was not found among multisig keys")
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}
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script, err := smartcontract.CreateMultiSigRedeemScript(m, pubs)
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if err != nil {
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return err
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}
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a.Address = address.Uint160ToString(hash.Hash160(script))
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a.Contract = &Contract{
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Script: script,
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Parameters: getContractParams(m),
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}
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return nil
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}
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// newAccountFromPrivateKey creates a wallet from the given PrivateKey.
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func newAccountFromPrivateKey(p *keys.PrivateKey) *Account {
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pubKey := p.PublicKey()
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pubAddr := p.Address()
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wif := p.WIF()
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a := &Account{
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publicKey: pubKey.Bytes(),
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privateKey: p,
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Address: pubAddr,
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wif: wif,
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Contract: &Contract{
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Script: pubKey.GetVerificationScript(),
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Parameters: getContractParams(1),
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},
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}
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return a
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}
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func getContractParams(n int) []ContractParam {
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params := make([]ContractParam, n)
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for i := range params {
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params[i].Name = fmt.Sprintf("parameter%d", i)
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params[i].Type = smartcontract.SignatureType
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}
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return params
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}
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