310104667d
Signing and inputs/outputs management is common for different transactions, so make separate functions for them.
108 lines
3.5 KiB
Go
108 lines
3.5 KiB
Go
package rpc
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import (
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"github.com/CityOfZion/neo-go/pkg/core/transaction"
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"github.com/CityOfZion/neo-go/pkg/crypto"
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"github.com/CityOfZion/neo-go/pkg/crypto/keys"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/util"
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errs "github.com/pkg/errors"
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)
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// CreateRawContractTransaction returns contract-type Transaction built from specified parameters.
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func CreateRawContractTransaction(params ContractTxParams) (*transaction.Transaction, error) {
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var (
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err error
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tx = transaction.NewContractTX()
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toAddressHash, fromAddressHash util.Uint160
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fromAddress string
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receiverOutput *transaction.Output
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wif, assetID, address, amount, balancer = params.wif, params.assetID, params.address, params.value, params.balancer
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)
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fromAddress = wif.PrivateKey.Address()
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if fromAddressHash, err = crypto.Uint160DecodeAddress(fromAddress); err != nil {
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return nil, errs.Wrapf(err, "Failed to take script hash from address: %v", fromAddress)
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}
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if toAddressHash, err = crypto.Uint160DecodeAddress(address); err != nil {
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return nil, errs.Wrapf(err, "Failed to take script hash from address: %v", address)
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}
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tx.Attributes = append(tx.Attributes,
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&transaction.Attribute{
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Usage: transaction.Script,
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Data: fromAddressHash.Bytes(),
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})
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if err = AddInputsAndUnspentsToTx(tx, fromAddress, assetID, amount, balancer); err != nil {
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return nil, errs.Wrap(err, "failed to add inputs and unspents to transaction")
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}
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receiverOutput = transaction.NewOutput(assetID, amount, toAddressHash)
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tx.AddOutput(receiverOutput)
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if err = SignTx(tx, &wif); err != nil {
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return nil, errs.Wrap(err, "failed to sign tx")
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}
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return tx, nil
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}
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// AddInputsAndUnspentsToTx adds inputs needed to transaction and one output
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// with change.
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func AddInputsAndUnspentsToTx(tx *transaction.Transaction, address string, assetID util.Uint256, amount util.Fixed8, balancer BalanceGetter) error {
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scriptHash, err := crypto.Uint160DecodeAddress(address)
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if err != nil {
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return errs.Wrapf(err, "failed to take script hash from address: %v", address)
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}
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inputs, spent, err := balancer.CalculateInputs(address, assetID, amount)
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if err != nil {
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return errs.Wrap(err, "failed to get inputs")
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}
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for _, input := range inputs {
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tx.AddInput(&input)
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}
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if senderUnspent := spent - amount; senderUnspent > 0 {
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senderOutput := transaction.NewOutput(assetID, senderUnspent, scriptHash)
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tx.AddOutput(senderOutput)
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}
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return nil
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}
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// SignTx signs given transaction in-place using given key.
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func SignTx(tx *transaction.Transaction, wif *keys.WIF) error {
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var witness transaction.Witness
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var err error
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if witness.InvocationScript, err = GetInvocationScript(tx, wif); err != nil {
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return errs.Wrap(err, "failed to create invocation script")
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}
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witness.VerificationScript = wif.GetVerificationScript()
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tx.Scripts = append(tx.Scripts, &witness)
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tx.Hash()
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return nil
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}
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// GetInvocationScript returns NEO VM script containing transaction signature.
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func GetInvocationScript(tx *transaction.Transaction, wif *keys.WIF) ([]byte, error) {
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const (
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pushbytes64 = 0x40
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)
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var (
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err error
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buf = io.NewBufBinWriter()
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signature []byte
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)
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tx.EncodeBinary(buf.BinWriter)
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if buf.Err != nil {
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return nil, errs.Wrap(buf.Err, "Failed to encode transaction to binary")
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}
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data := buf.Bytes()
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signature, err = wif.PrivateKey.Sign(data[:(len(data) - 1)])
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if err != nil {
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return nil, errs.Wrap(err, "Failed ti sign transaction with private key")
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}
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return append([]byte{pushbytes64}, signature...), nil
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}
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