/**
* Creates the initial multisig contract and incomplete refund transaction which can be requested
* at the appropriate time using {@link PaymentChannelClientState#getIncompleteRefundTransaction}
* and {@link PaymentChannelClientState#getMultisigContract()}. The way the contract is crafted
* can be adjusted by overriding {@link
* PaymentChannelClientState#editContractSendRequest(com.google.bitcoin.core.Wallet.SendRequest)}.
* By default unconfirmed coins are allowed to be used, as for micropayments the risk should be
* relatively low.
*
* @throws ValueOutOfRangeException if the value being used is too small to be accepted by the
* network
* @throws InsufficientMoneyException if the wallet doesn't contain enough balance to initiate
*/
public synchronized void initiate() throws ValueOutOfRangeException, InsufficientMoneyException {
final NetworkParameters params = wallet.getParams();
Transaction template = new Transaction(params);
// We always place the client key before the server key because, if either side wants some
// privacy, they can
// use a fresh key for the the multisig contract and nowhere else
List<ECKey> keys = Lists.newArrayList(myKey, serverMultisigKey);
// There is also probably a change output, but we don't bother shuffling them as it's obvious
// from the
// format which one is the change. If we start obfuscating the change output better in future
// this may
// be worth revisiting.
TransactionOutput multisigOutput =
template.addOutput(totalValue, ScriptBuilder.createMultiSigOutputScript(2, keys));
if (multisigOutput.getMinNonDustValue().compareTo(totalValue) > 0)
throw new ValueOutOfRangeException("totalValue too small to use");
Wallet.SendRequest req = Wallet.SendRequest.forTx(template);
req.coinSelector = AllowUnconfirmedCoinSelector.get();
editContractSendRequest(req);
req.shuffleOutputs = false; // TODO: Fix things so shuffling is usable.
wallet.completeTx(req);
Coin multisigFee = req.tx.getFee();
multisigContract = req.tx;
// Build a refund transaction that protects us in the case of a bad server that's just trying to
// cause havoc
// by locking up peoples money (perhaps as a precursor to a ransom attempt). We time lock it so
// the server
// has an assurance that we cannot take back our money by claiming a refund before the channel
// closes - this
// relies on the fact that since Bitcoin 0.8 time locked transactions are non-final. This will
// need to change
// in future as it breaks the intended design of timelocking/tx replacement, but for now it
// simplifies this
// specific protocol somewhat.
refundTx = new Transaction(params);
refundTx
.addInput(multisigOutput)
.setSequenceNumber(0); // Allow replacement when it's eventually reactivated.
refundTx.setLockTime(expiryTime);
if (totalValue.compareTo(Coin.CENT) < 0) {
// Must pay min fee.
final Coin valueAfterFee = totalValue.subtract(Transaction.REFERENCE_DEFAULT_MIN_TX_FEE);
if (Transaction.MIN_NONDUST_OUTPUT.compareTo(valueAfterFee) > 0)
throw new ValueOutOfRangeException("totalValue too small to use");
refundTx.addOutput(valueAfterFee, myKey.toAddress(params));
refundFees = multisigFee.add(Transaction.REFERENCE_DEFAULT_MIN_TX_FEE);
} else {
refundTx.addOutput(totalValue, myKey.toAddress(params));
refundFees = multisigFee;
}
refundTx.getConfidence().setSource(TransactionConfidence.Source.SELF);
log.info(
"initiated channel with multi-sig contract {}, refund {}",
multisigContract.getHashAsString(),
refundTx.getHashAsString());
state = State.INITIATED;
// Client should now call getIncompleteRefundTransaction() and send it to the server.
}
public static List<String> getAddresses() {
Blocks blocks = Blocks.getInstance();
List<ECKey> keys = blocks.wallet.getKeys();
List<String> addresses = new ArrayList<String>();
for (ECKey key : keys) {
addresses.add(key.toAddress(blocks.params).toString());
}
return addresses;
}
private synchronized Transaction makeUnsignedChannelContract(Coin valueToMe)
throws ValueOutOfRangeException {
Transaction tx = new Transaction(wallet.getParams());
tx.addInput(multisigContract.getOutput(0));
// Our output always comes first.
// TODO: We should drop myKey in favor of output key + multisig key separation
// (as its always obvious who the client is based on T2 output order)
tx.addOutput(valueToMe, myKey.toAddress(wallet.getParams()));
return tx;
}
@Override
public void showKey(ECKey key, String dir, boolean testnet) throws IOException {
NetworkParameters params = LotteryTx.getNetworkParameters(testnet);
writeln("Generated new <public key, secret key> pair" + (testnet ? " (for the testnet)" : ""));
writeln("They were saved under the " + dir + " directory");
writeln("The address, public key and the private key are:");
writeln(key.toAddress(params).toString());
writeln(Utils.bytesToHexString(key.getPubKey()));
writeln(key.getPrivateKeyEncoded(params).toString());
}
private byte[] determinePaymentRequest(final boolean includeBluetoothMac) {
final ECKey key = (ECKey) addressView.getSelectedItem();
final Address address = key.toAddress(Constants.NETWORK_PARAMETERS);
return PaymentProtocol.createPaymentRequest(
amountCalculatorLink.getAmount(),
address,
null,
includeBluetoothMac && bluetoothMac != null ? "bt:" + bluetoothMac : null)
.toByteArray();
}
public void sweepKey(ECKey key, long fee, int accountId, JSONArray outputs) {
mLogger.info("sweepKey starting");
mLogger.info("key addr " + key.toAddress(mParams).toString());
Transaction tx = new Transaction(mParams);
long balance = 0;
ArrayList<Script> scripts = new ArrayList<Script>();
try {
for (int ii = 0; ii < outputs.length(); ++ii) {
JSONObject output;
output = outputs.getJSONObject(ii);
String tx_hash = output.getString("tx_hash");
int tx_output_n = output.getInt("tx_output_n");
String script = output.getString("script");
// Reverse byte order, create hash.
Sha256Hash hash = new Sha256Hash(WalletUtil.msgHexToBytes(tx_hash));
tx.addInput(
new TransactionInput(
mParams, tx, new byte[] {}, new TransactionOutPoint(mParams, tx_output_n, hash)));
scripts.add(new Script(Hex.decode(script)));
balance += output.getLong("value");
}
} catch (JSONException e) {
e.printStackTrace();
throw new RuntimeException("trouble parsing unspent outputs");
}
// Compute balance - fee.
long amount = balance - fee;
mLogger.info(String.format("sweeping %d", amount));
// Figure out the destination address.
Address to = mHDWallet.nextReceiveAddress(accountId);
mLogger.info("sweeping to " + to.toString());
// Add output.
tx.addOutput(BigInteger.valueOf(amount), to);
WalletUtil.signTransactionInputs(tx, Transaction.SigHash.ALL, key, scripts);
mLogger.info("tx bytes: " + new String(Hex.encode(tx.bitcoinSerialize())));
// mKit.peerGroup().broadcastTransaction(tx);
broadcastTransaction(mKit.peerGroup(), tx);
mLogger.info("sweepKey finished");
}
private String determineBitcoinRequestStr(final boolean includeBluetoothMac) {
final ECKey key = (ECKey) addressView.getSelectedItem();
final Address address = key.toAddress(Constants.NETWORK_PARAMETERS);
final BigInteger amount = amountCalculatorLink.getAmount();
final StringBuilder uri =
new StringBuilder(BitcoinURI.convertToBitcoinURI(address, amount, null, null));
if (includeBluetoothMac && bluetoothMac != null) {
uri.append(amount == null ? '?' : '&');
uri.append(Bluetooth.MAC_URI_PARAM).append('=').append(bluetoothMac);
}
return uri.toString();
}
public Address determineSelectedAddress() {
final String selectedAddress = prefs.getString(Constants.PREFS_KEY_SELECTED_ADDRESS, null);
Address firstAddress = null;
for (final ECKey key : wallet.getKeys()) {
if (!wallet.isKeyRotating(key)) {
final Address address = key.toAddress(Constants.NETWORK_PARAMETERS);
if (address.toString().equals(selectedAddress)) return address;
if (firstAddress == null) firstAddress = address;
}
}
return firstAddress;
}
public void setUp(BlockStore blockStore) throws Exception {
BriefLogFormatter.init();
unitTestParams = UnitTestParams.get();
Wallet.SendRequest.DEFAULT_FEE_PER_KB = BigInteger.ZERO;
this.blockStore = blockStore;
wallet = new Wallet(unitTestParams);
key = new ECKey();
address = key.toAddress(unitTestParams);
wallet.addKey(key);
blockChain = new BlockChain(unitTestParams, wallet, blockStore);
startPeerServers();
if (clientType == ClientType.NIO_CLIENT_MANAGER
|| clientType == ClientType.BLOCKING_CLIENT_MANAGER) {
channels.startAsync();
channels.awaitRunning();
}
socketAddress = new InetSocketAddress("127.0.0.1", 1111);
}
