lnd.xprv/uspv/sortsignsend.go

package uspv

import (
	"bytes"
	"fmt"
	"log"

	"github.com/btcsuite/btcd/txscript"
	"github.com/btcsuite/btcd/wire"
	"github.com/btcsuite/btcutil"
	"github.com/btcsuite/btcutil/bloom"
	"github.com/btcsuite/btcutil/hdkeychain"
	"github.com/btcsuite/btcutil/txsort"
)

func (s *SPVCon) PongBack(nonce uint64) {
	mpong := wire.NewMsgPong(nonce)

	s.outMsgQueue <- mpong
	return
}

func (s *SPVCon) SendFilter(f *bloom.Filter) {
	s.outMsgQueue <- f.MsgFilterLoad()

	return
}

// Rebroadcast sends an inv message of all the unconfirmed txs the db is
// aware of.  This is called after every sync.  Only txids so hopefully not
// too annoying for nodes.
func (s *SPVCon) Rebroadcast() {
	// get all unconfirmed txs
	invMsg, err := s.TS.GetPendingInv()
	if err != nil {
		log.Printf("Rebroadcast error: %s", err.Error())
	}
	if len(invMsg.InvList) == 0 { // nothing to broadcast, so don't
		return
	}
	s.outMsgQueue <- invMsg
	return
}

func P2wpkhScript(adr btcutil.Address) ([]byte, error) {
	switch adr := adr.(type) {
	case *btcutil.AddressPubKeyHash:
		sb := txscript.NewScriptBuilder()
		sb.AddOp(txscript.OP_0)
		sb.AddData(adr.ScriptAddress())
		return sb.Script()
	}
	return nil, fmt.Errorf("%s is not pkh address", adr.String())
}

func (s *SPVCon) NewOutgoingTx(tx *wire.MsgTx) error {
	txid := tx.TxSha()
	// assign height of zero for txs we create
	err := s.TS.AddTxid(&txid, 0)
	if err != nil {
		return err
	}
	_, err = s.TS.Ingest(tx, 0) // our own tx; don't keep track of false positives
	if err != nil {
		return err
	}
	// make an inv message instead of a tx message to be polite
	iv1 := wire.NewInvVect(wire.InvTypeWitnessTx, &txid)
	invMsg := wire.NewMsgInv()
	err = invMsg.AddInvVect(iv1)
	if err != nil {
		return err
	}
	s.outMsgQueue <- invMsg
	return nil
}

func (t *TxStore) SignThis(tx *wire.MsgTx) error {
	fmt.Printf("-= SignThis =-\n")

	// sort tx before signing.
	txsort.InPlaceSort(tx)

	sigs := make([][]byte, len(tx.TxIn))
	// first iterate over each input
	for j, in := range tx.TxIn {
		for k := uint32(0); k < uint32(len(t.Adrs)); k++ {
			child, err := t.rootPrivKey.Child(k + hdkeychain.HardenedKeyStart)
			if err != nil {
				return err
			}
			myadr, err := child.Address(t.Param)
			if err != nil {
				return err
			}
			adrScript, err := txscript.PayToAddrScript(myadr)
			if err != nil {
				return err
			}
			if bytes.Equal(adrScript, in.SignatureScript) {
				fmt.Printf("Hit; key %d matches input %d. Signing.\n", k, j)
				priv, err := child.ECPrivKey()
				if err != nil {
					return err
				}
				sigs[j], err = txscript.SignatureScript(
					tx, j, in.SignatureScript, txscript.SigHashAll, priv, true)
				if err != nil {
					return err
				}
				break
			}
		}
	}
	for i, s := range sigs {
		if s != nil {
			tx.TxIn[i].SignatureScript = s
		}
	}
	return nil
}