@Test
public void testSimplePayment() throws Exception {
// Create a PaymentRequest and make sure the correct values are parsed by the PaymentSession.
MockPaymentSession paymentSession = new MockPaymentSession(newSimplePaymentRequest());
assertEquals(paymentRequestMemo, paymentSession.getMemo());
assertEquals(nanoCoins, paymentSession.getValue());
assertEquals(simplePaymentUrl, paymentSession.getPaymentUrl());
assertTrue(new Date(time * 1000L).equals(paymentSession.getDate()));
assertTrue(paymentSession.getSendRequest().tx.equals(tx));
assertFalse(paymentSession.isExpired());
// Send the payment and verify that the correct information is sent.
// Add a dummy input to tx so it is considered valid.
tx.addInput(new TransactionInput(params, tx, outputToMe.getScriptBytes()));
ArrayList<Transaction> txns = new ArrayList<Transaction>();
txns.add(tx);
Address refundAddr = new Address(params, serverKey.getPubKeyHash());
paymentSession.sendPayment(txns, refundAddr, paymentMemo);
assertEquals(1, paymentSession.getPaymentLog().size());
assertEquals(simplePaymentUrl, paymentSession.getPaymentLog().get(0).getUrl().toString());
Protos.Payment payment = paymentSession.getPaymentLog().get(0).getPayment();
assertEquals(paymentMemo, payment.getMemo());
assertEquals(merchantData, payment.getMerchantData());
assertEquals(1, payment.getRefundToCount());
assertEquals(nanoCoins.longValue(), payment.getRefundTo(0).getAmount());
TransactionOutput refundOutput = new TransactionOutput(params, null, nanoCoins, refundAddr);
ByteString refundScript = ByteString.copyFrom(refundOutput.getScriptBytes());
assertTrue(refundScript.equals(payment.getRefundTo(0).getScript()));
}
/**
* Verify the transaction structure as follows
*
* <ul>
* <li>A transaction must have at least one input and one output
* <li>A transaction output may not specify a negative number of coins
* <li>The sum of all of the output amounts must not exceed 21,000,000 BTC
* <li>A non-coinbase transaction may not contain any unconnected inputs
* <li>A connected output may not be used by more than one input
* <li>The input script must contain only push-data operations
* </ul>
*
* @param canonical TRUE to enforce canonical transactions
* @throws VerificationException Script verification failed
*/
public void verify(boolean canonical) throws VerificationException {
try {
// Must have at least one input and one output
if (txInputs.isEmpty() || txOutputs.isEmpty())
throw new VerificationException(
"Transaction does not have at least 1 input and 1 output",
RejectMessage.REJECT_INVALID,
txHash);
// No output value may be negative
// Sum of all output values must not exceed MAX_MONEY
BigInteger outTotal = BigInteger.ZERO;
for (TransactionOutput txOut : txOutputs) {
BigInteger outValue = txOut.getValue();
if (outValue.signum() < 0)
throw new VerificationException(
"Transaction output value is negative", RejectMessage.REJECT_INVALID, txHash);
outTotal = outTotal.add(outValue);
if (outTotal.compareTo(NetParams.MAX_MONEY) > 0)
throw new VerificationException(
"Total transaction output amount exceeds maximum",
RejectMessage.REJECT_INVALID,
txHash);
byte[] scriptBytes = txOut.getScriptBytes();
}
if (!coinBase) {
// All inputs must have connected outputs
// No outpoint may be used more than once
// Input scripts must consist of only push-data operations
List<OutPoint> outPoints = new ArrayList<>(txInputs.size());
for (TransactionInput txIn : txInputs) {
OutPoint outPoint = txIn.getOutPoint();
if (outPoint.getHash().equals(Sha256Hash.ZERO_HASH) || outPoint.getIndex() < 0)
throw new VerificationException(
"Non-coinbase transaction contains unconnected inputs",
RejectMessage.REJECT_INVALID,
txHash);
if (outPoints.contains(outPoint))
throw new VerificationException(
"Connected output used in multiple inputs", RejectMessage.REJECT_INVALID, txHash);
outPoints.add(outPoint);
if (canonical) {
if (!Script.checkInputScript(txIn.getScriptBytes()))
throw new VerificationException(
"Input script must contain only canonical push-data operations",
RejectMessage.REJECT_NONSTANDARD,
txHash);
}
}
}
} catch (EOFException exc) {
throw new VerificationException(
"End-of-data while processing script", RejectMessage.REJECT_MALFORMED, txHash);
}
}
/**
* If this input is connected, check the output is connected back to this input and release it if
* so, making it spendable once again.
*
* @return true if the disconnection took place, false if it was not connected.
*/
public boolean disconnect() {
if (outpoint.fromTx == null) return false;
TransactionOutput output = outpoint.fromTx.getOutput((int) outpoint.getIndex());
if (output.getSpentBy() == this) {
output.markAsUnspent();
outpoint.fromTx = null;
return true;
} else {
return false;
}
}
/**
* Verifies that this input can spend the given output. Note that this input must be a part of a
* transaction. Also note that the consistency of the outpoint will be checked, even if this input
* has not been connected.
*
* @param output the output that this input is supposed to spend.
* @throws ScriptException If the script doesn't verify.
* @throws VerificationException If the outpoint doesn't match the given output.
*/
public void verify(TransactionOutput output) throws VerificationException {
if (output.parent != null) {
if (!getOutpoint().getHash().equals(output.getParentTransaction().getHash()))
throw new VerificationException(
"This input does not refer to the tx containing the output.");
if (getOutpoint().getIndex() != output.getIndex())
throw new VerificationException("This input refers to a different output on the given tx.");
}
Script pubKey = output.getScriptPubKey();
int myIndex = getParentTransaction().getInputs().indexOf(this);
getScriptSig().correctlySpends(getParentTransaction(), myIndex, pubKey);
}
/** Creates an UNSIGNED input that links to the given output */
TransactionInput(
NetworkParameters params, Transaction parentTransaction, TransactionOutput output) {
super(params);
long outputIndex = output.getIndex();
if (output.getParentTransaction() != null) {
outpoint = new TransactionOutPoint(params, outputIndex, output.getParentTransaction());
} else {
outpoint = new TransactionOutPoint(params, output);
}
scriptBytes = EMPTY_ARRAY;
sequence = NO_SEQUENCE;
setParent(parentTransaction);
this.value = output.getValue();
length = 41;
}
@Override
void bitcoinSerializeToStream(OutputStream stream) throws IOException {
Utils.uint32ToByteStreamLE(height, stream);
stream.write(chainHead.getBytes());
stream.write(new VarInt(hits.length).encode());
stream.write(hits);
stream.write(new VarInt(outputs.size()).encode());
for (TransactionOutput output : outputs) {
// TODO: Allow these to be specified, if one day we care about sending this message ourselves
// (currently it's just used for unit testing).
Utils.uint32ToByteStreamLE(0L, stream); // Version
Utils.uint32ToByteStreamLE(0L, stream); // Height
output.bitcoinSerializeToStream(stream);
}
}
private boolean isConfirmed(TransactionOutput output) {
return output
.getParentTransaction()
.getConfidence()
.getConfidenceType()
.equals(TransactionConfidence.ConfidenceType.BUILDING);
}
// Create a payment transaction with valueToMe going back to us
private synchronized Wallet.SendRequest makeUnsignedChannelContract(Coin valueToMe) {
Transaction tx = new Transaction(wallet.getParams());
if (!totalValue.subtract(valueToMe).equals(Coin.ZERO)) {
clientOutput.setValue(totalValue.subtract(valueToMe));
tx.addOutput(clientOutput);
}
tx.addInput(multisigContract.getOutput(0));
return Wallet.SendRequest.forTx(tx);
}
/**
* Connects this input to the relevant output of the referenced transaction. Connecting means
* updating the internal pointers and spent flags. If the mode is to ABORT_ON_CONFLICT then the
* spent output won't be changed, but the outpoint.fromTx pointer will still be updated.
*
* @param transaction The transaction to try.
* @param mode Whether to abort if there's a pre-existing connection or not.
* @return NO_SUCH_TX if transaction is not the prevtx, ALREADY_SPENT if there was a conflict,
* SUCCESS if not.
*/
public ConnectionResult connect(Transaction transaction, ConnectMode mode) {
if (!transaction.getHash().equals(outpoint.getHash())) return ConnectionResult.NO_SUCH_TX;
checkElementIndex(
(int) outpoint.getIndex(), transaction.getOutputs().size(), "Corrupt transaction");
TransactionOutput out = transaction.getOutput((int) outpoint.getIndex());
if (!out.isAvailableForSpending()) {
if (getParentTransaction().equals(outpoint.fromTx)) {
// Already connected.
return ConnectionResult.SUCCESS;
} else if (mode == ConnectMode.DISCONNECT_ON_CONFLICT) {
out.markAsUnspent();
} else if (mode == ConnectMode.ABORT_ON_CONFLICT) {
outpoint.fromTx = out.getParentTransaction();
return TransactionInput.ConnectionResult.ALREADY_SPENT;
}
}
connect(out);
return TransactionInput.ConnectionResult.SUCCESS;
}
@Override
public CoinSelection select(Coin target, List<TransactionOutput> candidates) {
try {
LinkedList<TransactionOutput> gathered = Lists.newLinkedList();
Coin valueGathered = Coin.ZERO;
for (TransactionOutput output : candidates) {
if (ignorePending && !isConfirmed(output)) continue;
// Find the key that controls output, assuming it's a regular pay-to-pubkey or
// pay-to-address output.
// We ignore any other kind of exotic output on the assumption we can't spend it ourselves.
final Script scriptPubKey = output.getScriptPubKey();
ECKey controllingKey;
if (scriptPubKey.isSentToRawPubKey()) {
controllingKey = wallet.findKeyFromPubKey(scriptPubKey.getPubKey());
} else if (scriptPubKey.isSentToAddress()) {
controllingKey = wallet.findKeyFromPubHash(scriptPubKey.getPubKeyHash());
} else {
log.info("Skipping tx output {} because it's not of simple form.", output);
continue;
}
checkNotNull(
controllingKey, "Coin selector given output as candidate for which we lack the key");
if (controllingKey.getCreationTimeSeconds() >= unixTimeSeconds) continue;
// It's older than the cutoff time so select.
valueGathered = valueGathered.add(output.getValue());
gathered.push(output);
if (gathered.size() >= MAX_SIMULTANEOUS_INPUTS) {
log.warn(
"Reached {} inputs, going further would yield a tx that is too large, stopping here.",
gathered.size());
break;
}
}
return new CoinSelection(valueGathered, gathered);
} catch (ScriptException e) {
throw new RuntimeException(
e); // We should never have problems understanding scripts in our wallet.
}
}
@Test
public void testDefaults() throws Exception {
Protos.Output.Builder outputBuilder =
Protos.Output.newBuilder().setScript(ByteString.copyFrom(outputToMe.getScriptBytes()));
Protos.PaymentDetails paymentDetails =
Protos.PaymentDetails.newBuilder().setTime(time).addOutputs(outputBuilder).build();
Protos.PaymentRequest paymentRequest =
Protos.PaymentRequest.newBuilder()
.setSerializedPaymentDetails(paymentDetails.toByteString())
.build();
MockPaymentSession paymentSession = new MockPaymentSession(paymentRequest);
assertEquals(BigInteger.ZERO, paymentSession.getValue());
assertNull(paymentSession.getPaymentUrl());
assertNull(paymentSession.getMemo());
}
@Test
public void testExpiredPaymentRequest() throws Exception {
MockPaymentSession paymentSession = new MockPaymentSession(newExpiredPaymentRequest());
assertTrue(paymentSession.isExpired());
// Send the payment and verify that an exception is thrown.
// Add a dummy input to tx so it is considered valid.
tx.addInput(new TransactionInput(params, tx, outputToMe.getScriptBytes()));
ArrayList<Transaction> txns = new ArrayList<Transaction>();
txns.add(tx);
try {
paymentSession.sendPayment(txns, null, null);
} catch (PaymentRequestException.Expired e) {
assertEquals(0, paymentSession.getPaymentLog().size());
assertEquals(e.getMessage(), "PaymentRequest is expired");
return;
}
fail("Expected exception due to expired PaymentRequest");
}
private Protos.PaymentRequest newSimplePaymentRequest() {
Protos.Output.Builder outputBuilder =
Protos.Output.newBuilder()
.setAmount(nanoCoins.longValue())
.setScript(ByteString.copyFrom(outputToMe.getScriptBytes()));
Protos.PaymentDetails paymentDetails =
Protos.PaymentDetails.newBuilder()
.setNetwork("test")
.setTime(time)
.setPaymentUrl(simplePaymentUrl)
.addOutputs(outputBuilder)
.setMemo(paymentRequestMemo)
.setMerchantData(merchantData)
.build();
Protos.PaymentRequest paymentRequest =
Protos.PaymentRequest.newBuilder()
.setPaymentDetailsVersion(1)
.setPkiType("none")
.setSerializedPaymentDetails(paymentDetails.toByteString())
.build();
return paymentRequest;
}
private static Protos.Transaction makeTxProto(WalletTransaction wtx) {
Transaction tx = wtx.getTransaction();
Protos.Transaction.Builder txBuilder = Protos.Transaction.newBuilder();
txBuilder
.setPool(getProtoPool(wtx))
.setHash(hashToByteString(tx.getHash()))
.setVersion((int) tx.getVersion())
.setTime(tx.getTime());
if (tx.getUpdateTime() != null) {
txBuilder.setUpdatedAt(tx.getUpdateTime().getTime());
}
if (tx.getLockTime() > 0) {
txBuilder.setLockTime((int) tx.getLockTime());
}
// Handle inputs.
for (TransactionInput input : tx.getInputs()) {
Protos.TransactionInput.Builder inputBuilder =
Protos.TransactionInput.newBuilder()
.setScriptBytes(ByteString.copyFrom(input.getScriptBytes()))
.setTransactionOutPointHash(hashToByteString(input.getOutpoint().getHash()))
.setTransactionOutPointIndex((int) input.getOutpoint().getIndex());
if (input.hasSequence()) inputBuilder.setSequence((int) input.getSequenceNumber());
if (input.getValue() != null) inputBuilder.setValue(input.getValue().value);
txBuilder.addTransactionInput(inputBuilder);
}
// Handle outputs.
for (TransactionOutput output : tx.getOutputs()) {
Protos.TransactionOutput.Builder outputBuilder =
Protos.TransactionOutput.newBuilder()
.setScriptBytes(ByteString.copyFrom(output.getScriptBytes()))
.setValue(output.getValue().value);
final TransactionInput spentBy = output.getSpentBy();
if (spentBy != null) {
Sha256Hash spendingHash = spentBy.getParentTransaction().getHash();
int spentByTransactionIndex = spentBy.getParentTransaction().getInputs().indexOf(spentBy);
outputBuilder
.setSpentByTransactionHash(hashToByteString(spendingHash))
.setSpentByTransactionIndex(spentByTransactionIndex);
}
txBuilder.addTransactionOutput(outputBuilder);
}
// Handle which blocks tx was seen in.
final Map<Sha256Hash, Integer> appearsInHashes = tx.getAppearsInHashes();
if (appearsInHashes != null) {
for (Map.Entry<Sha256Hash, Integer> entry : appearsInHashes.entrySet()) {
txBuilder.addBlockHash(hashToByteString(entry.getKey()));
txBuilder.addBlockRelativityOffsets(entry.getValue());
}
}
if (tx.hasConfidence()) {
TransactionConfidence confidence = tx.getConfidence();
Protos.TransactionConfidence.Builder confidenceBuilder =
Protos.TransactionConfidence.newBuilder();
writeConfidence(txBuilder, confidence, confidenceBuilder);
}
Protos.Transaction.Purpose purpose;
switch (tx.getPurpose()) {
case UNKNOWN:
purpose = Protos.Transaction.Purpose.UNKNOWN;
break;
case USER_PAYMENT:
purpose = Protos.Transaction.Purpose.USER_PAYMENT;
break;
case KEY_ROTATION:
purpose = Protos.Transaction.Purpose.KEY_ROTATION;
break;
case ASSURANCE_CONTRACT_CLAIM:
purpose = Protos.Transaction.Purpose.ASSURANCE_CONTRACT_CLAIM;
break;
case ASSURANCE_CONTRACT_PLEDGE:
purpose = Protos.Transaction.Purpose.ASSURANCE_CONTRACT_PLEDGE;
break;
case ASSURANCE_CONTRACT_STUB:
purpose = Protos.Transaction.Purpose.ASSURANCE_CONTRACT_STUB;
break;
default:
throw new RuntimeException("New tx purpose serialization not implemented.");
}
txBuilder.setPurpose(purpose);
ExchangeRate exchangeRate = tx.getExchangeRate();
if (exchangeRate != null) {
Protos.ExchangeRate.Builder exchangeRateBuilder =
Protos.ExchangeRate.newBuilder()
.setCoinValue(exchangeRate.coin.value)
.setFiatValue(exchangeRate.fiat.value)
.setFiatCurrencyCode(exchangeRate.fiat.currencyCode);
txBuilder.setExchangeRate(exchangeRateBuilder);
}
if (tx.getMemo() != null) txBuilder.setMemo(tx.getMemo());
return txBuilder.build();
}
@Override
/** Used during reorgs to connect a block previously on a fork */
protected synchronized TransactionOutputChanges connectTransactions(StoredBlock newBlock)
throws VerificationException, BlockStoreException, PrunedException {
checkState(lock.isHeldByCurrentThread());
if (!params.passesCheckpoint(newBlock.getHeight(), newBlock.getHeader().getHash()))
throw new VerificationException("Block failed checkpoint lockin at " + newBlock.getHeight());
blockStore.beginDatabaseBatchWrite();
StoredUndoableBlock block = blockStore.getUndoBlock(newBlock.getHeader().getHash());
if (block == null) {
// We're trying to re-org too deep and the data needed has been deleted.
blockStore.abortDatabaseBatchWrite();
throw new PrunedException(newBlock.getHeader().getHash());
}
TransactionOutputChanges txOutChanges;
try {
List<Transaction> transactions = block.getTransactions();
if (transactions != null) {
LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
LinkedList<StoredTransactionOutput> txOutsCreated =
new LinkedList<StoredTransactionOutput>();
long sigOps = 0;
final Set<VerifyFlag> verifyFlags = EnumSet.noneOf(VerifyFlag.class);
if (newBlock.getHeader().getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME)
verifyFlags.add(VerifyFlag.P2SH);
if (!params.isCheckpoint(newBlock.getHeight())) {
for (Transaction tx : transactions) {
Sha256Hash hash = tx.getHash();
if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
throw new VerificationException("Block failed BIP30 test!");
}
}
if (scriptVerificationExecutor.isShutdown())
scriptVerificationExecutor =
Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
List<Future<VerificationException>> listScriptVerificationResults =
new ArrayList<Future<VerificationException>>(transactions.size());
for (final Transaction tx : transactions) {
boolean isCoinBase = tx.isCoinBase();
Coin valueIn = Coin.ZERO;
Coin valueOut = Coin.ZERO;
final List<Script> prevOutScripts = new LinkedList<Script>();
if (!isCoinBase) {
for (int index = 0; index < tx.getInputs().size(); index++) {
final TransactionInput in = tx.getInputs().get(index);
final StoredTransactionOutput prevOut =
blockStore.getTransactionOutput(
in.getOutpoint().getHash(), in.getOutpoint().getIndex());
if (prevOut == null)
throw new VerificationException(
"Attempted spend of a non-existent or already spent output!");
if (newBlock.getHeight() - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
throw new VerificationException(
"Tried to spend coinbase at depth "
+ (newBlock.getHeight() - prevOut.getHeight()));
valueIn = valueIn.add(prevOut.getValue());
if (verifyFlags.contains(VerifyFlag.P2SH)) {
Script script = new Script(prevOut.getScriptBytes());
if (script.isPayToScriptHash())
sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
if (sigOps > Block.MAX_BLOCK_SIGOPS)
throw new VerificationException("Too many P2SH SigOps in block");
}
prevOutScripts.add(new Script(prevOut.getScriptBytes()));
blockStore.removeUnspentTransactionOutput(prevOut);
txOutsSpent.add(prevOut);
}
}
Sha256Hash hash = tx.getHash();
for (TransactionOutput out : tx.getOutputs()) {
valueOut = valueOut.add(out.getValue());
StoredTransactionOutput newOut =
new StoredTransactionOutput(
hash,
out.getIndex(),
out.getValue(),
newBlock.getHeight(),
isCoinBase,
out.getScriptBytes());
blockStore.addUnspentTransactionOutput(newOut);
txOutsCreated.add(newOut);
}
// All values were already checked for being non-negative (as it is verified in
// Transaction.verify())
// but we check again here just for defence in depth. Transactions with zero output value
// are OK.
if (valueOut.signum() < 0 || valueOut.compareTo(NetworkParameters.MAX_MONEY) > 0)
throw new VerificationException("Transaction output value out of range");
if (!isCoinBase) {
// Because correctlySpends modifies transactions, this must come after we are done with
// tx
FutureTask<VerificationException> future =
new FutureTask<VerificationException>(
new Verifier(tx, prevOutScripts, verifyFlags));
scriptVerificationExecutor.execute(future);
listScriptVerificationResults.add(future);
}
}
txOutChanges = new TransactionOutputChanges(txOutsCreated, txOutsSpent);
for (Future<VerificationException> future : listScriptVerificationResults) {
VerificationException e;
try {
e = future.get();
} catch (InterruptedException thrownE) {
throw new RuntimeException(thrownE); // Shouldn't happen
} catch (ExecutionException thrownE) {
log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
throw new VerificationException(
"Bug in Script.correctlySpends, likely script malformed in some new and interesting way.",
thrownE);
}
if (e != null) throw e;
}
} else {
txOutChanges = block.getTxOutChanges();
if (!params.isCheckpoint(newBlock.getHeight()))
for (StoredTransactionOutput out : txOutChanges.txOutsCreated) {
Sha256Hash hash = out.getHash();
if (blockStore.getTransactionOutput(hash, out.getIndex()) != null)
throw new VerificationException("Block failed BIP30 test!");
}
for (StoredTransactionOutput out : txOutChanges.txOutsCreated)
blockStore.addUnspentTransactionOutput(out);
for (StoredTransactionOutput out : txOutChanges.txOutsSpent)
blockStore.removeUnspentTransactionOutput(out);
}
} catch (VerificationException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
} catch (BlockStoreException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
}
return txOutChanges;
}
@Override
protected TransactionOutputChanges connectTransactions(int height, Block block)
throws VerificationException, BlockStoreException {
checkState(lock.isHeldByCurrentThread());
if (block.transactions == null)
throw new RuntimeException(
"connectTransactions called with Block that didn't have transactions!");
if (!params.passesCheckpoint(height, block.getHash()))
throw new VerificationException("Block failed checkpoint lockin at " + height);
blockStore.beginDatabaseBatchWrite();
LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
LinkedList<StoredTransactionOutput> txOutsCreated = new LinkedList<StoredTransactionOutput>();
long sigOps = 0;
final Set<VerifyFlag> verifyFlags = EnumSet.noneOf(VerifyFlag.class);
if (block.getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME)
verifyFlags.add(VerifyFlag.P2SH);
if (scriptVerificationExecutor.isShutdown())
scriptVerificationExecutor =
Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
List<Future<VerificationException>> listScriptVerificationResults =
new ArrayList<Future<VerificationException>>(block.transactions.size());
try {
if (!params.isCheckpoint(height)) {
// BIP30 violator blocks are ones that contain a duplicated transaction. They are all in the
// checkpoints list and we therefore only check non-checkpoints for duplicated transactions
// here. See the
// BIP30 document for more details on this:
// https://github.com.matthewmitchell/bips/blob/master/bip-0030.mediawiki
for (Transaction tx : block.transactions) {
Sha256Hash hash = tx.getHash();
// If we already have unspent outputs for this hash, we saw the tx already. Either the
// block is
// being added twice (bug) or the block is a BIP30 violator.
if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
throw new VerificationException("Block failed BIP30 test!");
if (verifyFlags.contains(
VerifyFlag
.P2SH)) // We already check non-BIP16 sigops in Block.verifyTransactions(true)
sigOps += tx.getSigOpCount();
}
}
for (final Transaction tx : block.transactions) {
boolean isCoinBase = tx.isCoinBase();
Coin valueIn = Coin.ZERO;
Coin valueOut = Coin.ZERO;
final List<Script> prevOutScripts = new LinkedList<Script>();
if (!isCoinBase) {
// For each input of the transaction remove the corresponding output from the set of
// unspent
// outputs.
for (int index = 0; index < tx.getInputs().size(); index++) {
TransactionInput in = tx.getInputs().get(index);
StoredTransactionOutput prevOut =
blockStore.getTransactionOutput(
in.getOutpoint().getHash(), in.getOutpoint().getIndex());
if (prevOut == null)
throw new VerificationException(
"Attempted to spend a non-existent or already spent output!");
// Coinbases can't be spent until they mature, to avoid re-orgs destroying entire
// transaction
// chains. The assumption is there will ~never be re-orgs deeper than the spendable
// coinbase
// chain depth.
if (height - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
throw new VerificationException(
"Tried to spend coinbase at depth " + (height - prevOut.getHeight()));
// TODO: Check we're not spending the genesis transaction here. Satoshis code won't
// allow it.
valueIn = valueIn.add(prevOut.getValue());
if (verifyFlags.contains(VerifyFlag.P2SH)) {
if (new Script(prevOut.getScriptBytes()).isPayToScriptHash())
sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
if (sigOps > Block.MAX_BLOCK_SIGOPS)
throw new VerificationException("Too many P2SH SigOps in block");
}
prevOutScripts.add(new Script(prevOut.getScriptBytes()));
// in.getScriptSig().correctlySpends(tx, index, new Script(params,
// prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length));
blockStore.removeUnspentTransactionOutput(prevOut);
txOutsSpent.add(prevOut);
}
}
Sha256Hash hash = tx.getHash();
for (TransactionOutput out : tx.getOutputs()) {
valueOut = valueOut.add(out.getValue());
// For each output, add it to the set of unspent outputs so it can be consumed in future.
StoredTransactionOutput newOut =
new StoredTransactionOutput(
hash, out.getIndex(), out.getValue(), height, isCoinBase, out.getScriptBytes());
blockStore.addUnspentTransactionOutput(newOut);
txOutsCreated.add(newOut);
}
// All values were already checked for being non-negative (as it is verified in
// Transaction.verify())
// but we check again here just for defence in depth. Transactions with zero output value
// are OK.
if (valueOut.signum() < 0 || valueOut.compareTo(NetworkParameters.MAX_MONEY) > 0)
throw new VerificationException("Transaction output value out of range");
if (!isCoinBase && runScripts) {
// Because correctlySpends modifies transactions, this must come after we are done with tx
FutureTask<VerificationException> future =
new FutureTask<VerificationException>(new Verifier(tx, prevOutScripts, verifyFlags));
scriptVerificationExecutor.execute(future);
listScriptVerificationResults.add(future);
}
}
for (Future<VerificationException> future : listScriptVerificationResults) {
VerificationException e;
try {
e = future.get();
} catch (InterruptedException thrownE) {
throw new RuntimeException(thrownE); // Shouldn't happen
} catch (ExecutionException thrownE) {
log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
throw new VerificationException(
"Bug in Script.correctlySpends, likely script malformed in some new and interesting way.",
thrownE);
}
if (e != null) throw e;
}
} catch (VerificationException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
} catch (BlockStoreException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
}
return new TransactionOutputChanges(txOutsCreated, txOutsSpent);
}
@Override
/** Used during reorgs to connect a block previously on a fork */
protected synchronized TransactionOutputChanges connectTransactions(StoredBlock newBlock)
throws VerificationException, BlockStoreException, PrunedException {
checkState(lock.isLocked());
if (!params.passesCheckpoint(newBlock.getHeight(), newBlock.getHeader().getHash()))
throw new VerificationException("Block failed checkpoint lockin at " + newBlock.getHeight());
blockStore.beginDatabaseBatchWrite();
StoredUndoableBlock block = blockStore.getUndoBlock(newBlock.getHeader().getHash());
if (block == null) {
// We're trying to re-org too deep and the data needed has been deleted.
blockStore.abortDatabaseBatchWrite();
throw new PrunedException(newBlock.getHeader().getHash());
}
TransactionOutputChanges txOutChanges;
try {
List<Transaction> transactions = block.getTransactions();
if (transactions != null) {
LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
LinkedList<StoredTransactionOutput> txOutsCreated =
new LinkedList<StoredTransactionOutput>();
long sigOps = 0;
final boolean enforcePayToScriptHash =
newBlock.getHeader().getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME;
if (!params.isCheckpoint(newBlock.getHeight())) {
for (Transaction tx : transactions) {
Sha256Hash hash = tx.getHash();
if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
throw new VerificationException("Block failed BIP30 test!");
}
}
BigInteger totalFees = BigInteger.ZERO;
BigInteger coinbaseValue = null;
if (scriptVerificationExecutor.isShutdown())
scriptVerificationExecutor =
Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
List<Future<VerificationException>> listScriptVerificationResults =
new ArrayList<Future<VerificationException>>(transactions.size());
for (final Transaction tx : transactions) {
boolean isCoinBase = tx.isCoinBase();
BigInteger valueIn = BigInteger.ZERO;
BigInteger valueOut = BigInteger.ZERO;
if (!isCoinBase) {
for (int index = 0; index < tx.getInputs().size(); index++) {
final TransactionInput in = tx.getInputs().get(index);
final StoredTransactionOutput prevOut =
blockStore.getTransactionOutput(
in.getOutpoint().getHash(), in.getOutpoint().getIndex());
if (prevOut == null)
throw new VerificationException(
"Attempted spend of a non-existent or already spent output!");
if (newBlock.getHeight() - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
throw new VerificationException(
"Tried to spend coinbase at depth "
+ (newBlock.getHeight() - prevOut.getHeight()));
valueIn = valueIn.add(prevOut.getValue());
if (enforcePayToScriptHash) {
Script script =
new Script(
params, prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length);
if (script.isPayToScriptHash())
sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
if (sigOps > Block.MAX_BLOCK_SIGOPS)
throw new VerificationException("Too many P2SH SigOps in block");
}
// All of these copies are terribly ugly, however without them,
// I see some odd concurrency issues where scripts throw exceptions
// (mostly "Attempted OP_* on empty stack" or similar) when they shouldn't.
// In my tests, total time spent in net.usecredits.credits.core when
// downloading the chain is < 0.5%, so doing this is no big efficiency issue.
// TODO: Find out the underlying issue and create a better work-around
// TODO: Thoroughly test that this fixes the issue like the non-StoredBlock version
// does
final int currentIndex = index;
final Script scriptSig = in.getScriptSig();
final Script scriptPubKey =
new Script(params, prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length);
FutureTask<VerificationException> future =
new FutureTask<VerificationException>(
new Callable<VerificationException>() {
public VerificationException call() {
try {
scriptSig.correctlySpends(
tx, currentIndex, scriptPubKey, enforcePayToScriptHash);
} catch (VerificationException e) {
return e;
}
return null;
}
});
scriptVerificationExecutor.execute(future);
listScriptVerificationResults.add(future);
blockStore.removeUnspentTransactionOutput(prevOut);
txOutsSpent.add(prevOut);
}
}
Sha256Hash hash = tx.getHash();
for (TransactionOutput out : tx.getOutputs()) {
valueOut = valueOut.add(out.getValue());
StoredTransactionOutput newOut =
new StoredTransactionOutput(
hash,
out.getIndex(),
out.getValue(),
newBlock.getHeight(),
isCoinBase,
out.getScriptBytes());
blockStore.addUnspentTransactionOutput(newOut);
txOutsCreated.add(newOut);
}
// All values were already checked for being non-negative (as it is verified in
// Transaction.verify())
// but we check again here just for defence in depth. Transactions with zero output value
// are OK.
if (valueOut.compareTo(BigInteger.ZERO) < 0 || valueOut.compareTo(params.MAX_MONEY) > 0)
throw new VerificationException("Transaction output value out of rage");
if (isCoinBase) {
coinbaseValue = valueOut;
} else {
if (valueIn.compareTo(valueOut) < 0 || valueIn.compareTo(params.MAX_MONEY) > 0)
throw new VerificationException("Transaction input value out of range");
totalFees = totalFees.add(valueIn.subtract(valueOut));
}
}
if (totalFees.compareTo(params.MAX_MONEY) > 0
|| newBlock
.getHeader()
.getBlockInflation(newBlock.getHeight())
.add(totalFees)
.compareTo(coinbaseValue)
< 0) throw new VerificationException("Transaction fees out of range");
txOutChanges = new TransactionOutputChanges(txOutsCreated, txOutsSpent);
for (Future<VerificationException> future : listScriptVerificationResults) {
VerificationException e;
try {
e = future.get();
} catch (InterruptedException thrownE) {
throw new RuntimeException(thrownE); // Shouldn't happen
} catch (ExecutionException thrownE) {
log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
throw new VerificationException(
"Bug in Script.correctlySpends, likely script malformed in some new and interesting way.");
}
if (e != null) throw e;
}
} else {
txOutChanges = block.getTxOutChanges();
if (!params.isCheckpoint(newBlock.getHeight()))
for (StoredTransactionOutput out : txOutChanges.txOutsCreated) {
Sha256Hash hash = out.getHash();
if (blockStore.getTransactionOutput(hash, out.getIndex()) != null)
throw new VerificationException("Block failed BIP30 test!");
}
for (StoredTransactionOutput out : txOutChanges.txOutsCreated)
blockStore.addUnspentTransactionOutput(out);
for (StoredTransactionOutput out : txOutChanges.txOutsSpent)
blockStore.removeUnspentTransactionOutput(out);
}
} catch (VerificationException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
} catch (BlockStoreException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
}
return txOutChanges;
}
@Override
protected TransactionOutputChanges connectTransactions(int height, Block block)
throws VerificationException, BlockStoreException {
checkState(lock.isLocked());
if (block.transactions == null)
throw new RuntimeException(
"connectTransactions called with Block that didn't have transactions!");
if (!params.passesCheckpoint(height, block.getHash()))
throw new VerificationException("Block failed checkpoint lockin at " + height);
blockStore.beginDatabaseBatchWrite();
LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
LinkedList<StoredTransactionOutput> txOutsCreated = new LinkedList<StoredTransactionOutput>();
long sigOps = 0;
final boolean enforceBIP16 = block.getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME;
if (scriptVerificationExecutor.isShutdown())
scriptVerificationExecutor =
Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
List<Future<VerificationException>> listScriptVerificationResults =
new ArrayList<Future<VerificationException>>(block.transactions.size());
try {
if (!params.isCheckpoint(height)) {
// BIP30 violator blocks are ones that contain a duplicated transaction. They are all in the
// checkpoints list and we therefore only check non-checkpoints for duplicated transactions
// here. See the
// BIP30 document for more details on this: https://en.litecoin.it/wiki/BIP_0030
for (Transaction tx : block.transactions) {
Sha256Hash hash = tx.getHash();
// If we already have unspent outputs for this hash, we saw the tx already. Either the
// block is
// being added twice (bug) or the block is a BIP30 violator.
if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
throw new VerificationException("Block failed BIP30 test!");
if (enforceBIP16) // We already check non-BIP16 sigops in Block.verifyTransactions(true)
sigOps += tx.getSigOpCount();
}
}
BigInteger totalFees = BigInteger.ZERO;
BigInteger coinbaseValue = null;
for (Transaction tx : block.transactions) {
boolean isCoinBase = tx.isCoinBase();
BigInteger valueIn = BigInteger.ZERO;
BigInteger valueOut = BigInteger.ZERO;
if (!isCoinBase) {
// For each input of the transaction remove the corresponding output from the set of
// unspent
// outputs.
for (int index = 0; index < tx.getInputs().size(); index++) {
TransactionInput in = tx.getInputs().get(index);
StoredTransactionOutput prevOut =
blockStore.getTransactionOutput(
in.getOutpoint().getHash(), in.getOutpoint().getIndex());
if (prevOut == null)
throw new VerificationException(
"Attempted to spend a non-existent or already spent output!");
// Coinbases can't be spent until they mature, to avoid re-orgs destroying entire
// transaction
// chains. The assumption is there will ~never be re-orgs deeper than the spendable
// coinbase
// chain depth.
if (height - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
throw new VerificationException(
"Tried to spend coinbase at depth " + (height - prevOut.getHeight()));
// TODO: Check we're not spending the genesis transaction here. Satoshis code won't
// allow it.
valueIn = valueIn.add(prevOut.getValue());
if (enforceBIP16) {
if (new Script(params, prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length)
.isPayToScriptHash()) sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
if (sigOps > Block.MAX_BLOCK_SIGOPS)
throw new VerificationException("Too many P2SH SigOps in block");
}
// All of these copies are terribly ugly, however without them,
// I see some odd concurrency issues where scripts throw exceptions
// (mostly "Attempted OP_* on empty stack" or similar) when they shouldn't.
// In my tests, total time spent in net.usecredits.credits.core when
// downloading the chain is < 0.5%, so doing this is no big efficiency issue.
// TODO: Find out the underlying issue and create a better work-around
final int currentIndex = index;
final Transaction txCache;
try {
txCache = new Transaction(params, tx.unsafeLitecoinSerialize());
} catch (ProtocolException e1) {
throw new RuntimeException(e1);
}
final Script scriptSig = in.getScriptSig();
final Script scriptPubKey =
new Script(params, prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length);
FutureTask<VerificationException> future =
new FutureTask<VerificationException>(
new Callable<VerificationException>() {
public VerificationException call() {
try {
scriptSig.correctlySpends(
txCache, currentIndex, scriptPubKey, enforceBIP16);
} catch (VerificationException e) {
return e;
}
return null;
}
});
scriptVerificationExecutor.execute(future);
listScriptVerificationResults.add(future);
// in.getScriptSig().correctlySpends(tx, index, new Script(params,
// prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length));
blockStore.removeUnspentTransactionOutput(prevOut);
txOutsSpent.add(prevOut);
}
}
Sha256Hash hash = tx.getHash();
for (TransactionOutput out : tx.getOutputs()) {
valueOut = valueOut.add(out.getValue());
// For each output, add it to the set of unspent outputs so it can be consumed in future.
StoredTransactionOutput newOut =
new StoredTransactionOutput(
hash, out.getIndex(), out.getValue(), height, isCoinBase, out.getScriptBytes());
blockStore.addUnspentTransactionOutput(newOut);
txOutsCreated.add(newOut);
}
// All values were already checked for being non-negative (as it is verified in
// Transaction.verify())
// but we check again here just for defence in depth. Transactions with zero output value
// are OK.
if (valueOut.compareTo(BigInteger.ZERO) < 0 || valueOut.compareTo(params.MAX_MONEY) > 0)
throw new VerificationException("Transaction output value out of rage");
if (isCoinBase) {
coinbaseValue = valueOut;
} else {
if (valueIn.compareTo(valueOut) < 0 || valueIn.compareTo(params.MAX_MONEY) > 0)
throw new VerificationException("Transaction input value out of range");
totalFees = totalFees.add(valueIn.subtract(valueOut));
}
}
if (totalFees.compareTo(params.MAX_MONEY) > 0
|| block.getBlockInflation(height).add(totalFees).compareTo(coinbaseValue) < 0)
throw new VerificationException("Transaction fees out of range");
for (Future<VerificationException> future : listScriptVerificationResults) {
VerificationException e;
try {
e = future.get();
} catch (InterruptedException thrownE) {
throw new RuntimeException(thrownE); // Shouldn't happen
} catch (ExecutionException thrownE) {
log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
throw new VerificationException(
"Bug in Script.correctlySpends, likely script malformed in some new and interesting way.");
}
if (e != null) throw e;
}
} catch (VerificationException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
} catch (BlockStoreException e) {
scriptVerificationExecutor.shutdownNow();
blockStore.abortDatabaseBatchWrite();
throw e;
}
return new TransactionOutputChanges(txOutsCreated, txOutsSpent);
}
/**
* Serializes the transaction for use in a signature
*
* @param index Current transaction index
* @param sigHashType Signature hash type
* @param subScriptBytes Replacement script for the current input
* @param outBuffer Output buffer
* @throws ScriptException Transaction index out-of-range
*/
public final void serializeForSignature(
int index, int sigHashType, byte[] subScriptBytes, SerializedBuffer outBuffer)
throws ScriptException {
int hashType;
boolean anyoneCanPay;
//
// The transaction input must be within range
//
if (index < 0 || index >= txInputs.size())
throw new ScriptException("Transaction input index is not valid");
//
// Check for a valid hash type
//
// Note that SIGHASH_ANYONE_CAN_PAY is or'ed with one of the other hash types. So we need
// to remove it when checking for a valid signature.
//
// SIGHASH_ALL: This is the default. It indicates that everything about the transaction is
// signed
// except for the input scripts. Signing the input scripts as well would
// obviously make
// it impossible to construct a transaction.
// SIGHASH_NONE: The outputs are not signed and can be anything. This mode allows others to
// update
// the transaction by changing their inputs sequence numbers. This means that
// all
// input sequence numbers are set to 0 except for the current input.
// SIGHASH_SINGLE: Outputs up to and including the current input index number are included.
// Outputs
// before the current index have a -1 value and an empty script. All input
// sequence
// numbers are set to 0 except for the current input.
//
// The SIGHASH_ANYONE_CAN_PAY modifier can be combined with the above three modes. When set,
// only that
// input is signed and the other inputs can be anything.
//
// In all cases, the script for the current input is replaced with the script from the connected
// output. All other input scripts are set to an empty script.
//
// The reference client accepts an invalid hash types and treats it as SIGHASH_ALL. So we need
// to
// do the same.
//
anyoneCanPay = ((sigHashType & ScriptOpCodes.SIGHASH_ANYONE_CAN_PAY) != 0);
hashType = sigHashType & (255 - ScriptOpCodes.SIGHASH_ANYONE_CAN_PAY);
if (hashType != ScriptOpCodes.SIGHASH_ALL
&& hashType != ScriptOpCodes.SIGHASH_NONE
&& hashType != ScriptOpCodes.SIGHASH_SINGLE) hashType = ScriptOpCodes.SIGHASH_ALL;
//
// Serialize the version
//
outBuffer.putInt(txVersion);
//
// Serialize the inputs
//
// For SIGHASH_ANYONE_CAN_PAY, only the current input is included in the signature.
// Otherwise, all inputs are included.
//
List<TransactionInput> sigInputs;
if (anyoneCanPay) {
sigInputs = new ArrayList<>(1);
sigInputs.add(txInputs.get(index));
} else {
sigInputs = txInputs;
}
outBuffer.putVarInt(sigInputs.size());
byte[] emptyScriptBytes = new byte[0];
for (TransactionInput txInput : sigInputs)
txInput.serializeForSignature(
index,
hashType,
(txInput.getIndex() == index ? subScriptBytes : emptyScriptBytes),
outBuffer);
//
// Serialize the outputs
//
if (hashType == ScriptOpCodes.SIGHASH_NONE) {
//
// There are no outputs for SIGHASH_NONE
//
outBuffer.putVarInt(0);
} else if (hashType == ScriptOpCodes.SIGHASH_SINGLE) {
//
// The output list is resized to the input index+1
//
if (txOutputs.size() <= index)
throw new ScriptException("Input index out-of-range for SIGHASH_SINGLE");
outBuffer.putVarInt(index + 1);
for (TransactionOutput txOutput : txOutputs) {
if (txOutput.getIndex() > index) break;
txOutput.serializeForSignature(index, hashType, outBuffer);
}
} else {
//
// All outputs are serialized for SIGHASH_ALL
//
outBuffer.putVarInt(txOutputs.size());
for (TransactionOutput txOutput : txOutputs)
txOutput.serializeForSignature(index, hashType, outBuffer);
}
//
// Serialize the lock time
//
outBuffer.putUnsignedInt(txLockTime);
}
/**
* Called when the client provides us with a new signature and wishes to increment total payment
* by size. Verifies the provided signature and only updates values if everything checks out. If
* the new refundSize is not the lowest we have seen, it is simply ignored.
*
* @param refundSize How many satoshis of the original contract are refunded to the client (the
* rest are ours)
* @param signatureBytes The new signature spending the multi-sig contract to a new payment
* transaction
* @throws VerificationException If the signature does not verify or size is out of range (incl
* being rejected by the network as dust).
* @return true if there is more value left on the channel, false if it is now fully used up.
*/
public synchronized boolean incrementPayment(Coin refundSize, byte[] signatureBytes)
throws VerificationException, ValueOutOfRangeException, InsufficientMoneyException {
checkState(state == State.READY);
checkNotNull(refundSize);
checkNotNull(signatureBytes);
TransactionSignature signature = TransactionSignature.decodeFromBitcoin(signatureBytes, true);
// We allow snapping to zero for the payment amount because it's treated specially later, but
// not less than
// the dust level because that would prevent the transaction from being relayed/mined.
final boolean fullyUsedUp = refundSize.equals(Coin.ZERO);
if (refundSize.compareTo(clientOutput.getMinNonDustValue()) < 0 && !fullyUsedUp)
throw new ValueOutOfRangeException(
"Attempt to refund negative value or value too small to be accepted by the network");
Coin newValueToMe = totalValue.subtract(refundSize);
if (newValueToMe.signum() < 0)
throw new ValueOutOfRangeException("Attempt to refund more than the contract allows.");
if (newValueToMe.compareTo(bestValueToMe) < 0)
throw new ValueOutOfRangeException("Attempt to roll back payment on the channel.");
// Get the wallet's copy of the multisigContract (ie with confidence information), if this is
// null, the wallet
// was not connected to the peergroup when the contract was broadcast (which may cause issues
// down the road, and
// disables our double-spend check next)
Transaction walletContract = wallet.getTransaction(multisigContract.getHash());
checkNotNull(
walletContract,
"Wallet did not contain multisig contract {} after state was marked READY",
multisigContract.getHash());
// Note that we check for DEAD state here, but this test is essentially useless in production
// because we will
// miss most double-spends due to bloom filtering right now anyway. This will eventually fixed
// by network-wide
// double-spend notifications, so we just wait instead of attempting to add all dependant
// outpoints to our bloom
// filters (and probably missing lots of edge-cases).
if (walletContract.getConfidence().getConfidenceType()
== TransactionConfidence.ConfidenceType.DEAD) {
close();
throw new VerificationException("Multisig contract was double-spent");
}
Transaction.SigHash mode;
// If the client doesn't want anything back, they shouldn't sign any outputs at all.
if (fullyUsedUp) mode = Transaction.SigHash.NONE;
else mode = Transaction.SigHash.SINGLE;
if (signature.sigHashMode() != mode || !signature.anyoneCanPay())
throw new VerificationException(
"New payment signature was not signed with the right SIGHASH flags.");
Wallet.SendRequest req = makeUnsignedChannelContract(newValueToMe);
// Now check the signature is correct.
// Note that the client must sign with SIGHASH_{SINGLE/NONE} | SIGHASH_ANYONECANPAY to allow us
// to add additional
// inputs (in case we need to add significant fee, or something...) and any outputs we want to
// pay to.
Sha256Hash sighash = req.tx.hashForSignature(0, multisigScript, mode, true);
if (!clientKey.verify(sighash, signature))
throw new VerificationException("Signature does not verify on tx\n" + req.tx);
bestValueToMe = newValueToMe;
bestValueSignature = signatureBytes;
updateChannelInWallet();
return !fullyUsedUp;
}
/**
* Internal use only: connects this TransactionInput to the given output (updates pointers and
* spent flags)
*/
public void connect(TransactionOutput out) {
outpoint.fromTx = out.getParentTransaction();
out.markAsSpent(this);
value = out.getValue();
}
