forked from Qortal/qortal
First draft of Pirate Chain trade bot. Not tested yet.
This has been modified to a) use full public keys instead of PKH, and b) hand off all transaction building, signing, and broadcasting to the (heavily customized) Pirate light wallet library.
This commit is contained in:
CalDescent
parent
9e1b23caf6
commit
7c807f754e
@ -0,0 +1,904 @@
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package org.qortal.controller.tradebot;
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import com.google.common.hash.HashCode;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.bitcoinj.core.*;
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import org.qortal.account.PrivateKeyAccount;
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import org.qortal.account.PublicKeyAccount;
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import org.qortal.api.model.crosschain.TradeBotCreateRequest;
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import org.qortal.asset.Asset;
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import org.qortal.crosschain.*;
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import org.qortal.crypto.Crypto;
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import org.qortal.data.at.ATData;
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import org.qortal.data.crosschain.CrossChainTradeData;
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import org.qortal.data.crosschain.TradeBotData;
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import org.qortal.data.transaction.BaseTransactionData;
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import org.qortal.data.transaction.DeployAtTransactionData;
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import org.qortal.data.transaction.MessageTransactionData;
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import org.qortal.group.Group;
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import org.qortal.repository.DataException;
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import org.qortal.repository.Repository;
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import org.qortal.transaction.DeployAtTransaction;
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import org.qortal.transaction.MessageTransaction;
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import org.qortal.transaction.Transaction.ValidationResult;
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import org.qortal.transform.TransformationException;
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import org.qortal.transform.transaction.DeployAtTransactionTransformer;
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import org.qortal.utils.Base58;
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import org.qortal.utils.NTP;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Map;
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import java.util.stream.Collectors;
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import static java.util.Arrays.stream;
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import static java.util.stream.Collectors.toMap;
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/**
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* Performing cross-chain trading steps on behalf of user.
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* <p>
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* We deal with three different independent state-spaces here:
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* <ul>
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* <li>Qortal blockchain</li>
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* <li>Foreign blockchain</li>
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* <li>Trade-bot entries</li>
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* </ul>
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*/
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public class PirateChainACCTv3TradeBot implements AcctTradeBot {
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private static final Logger LOGGER = LogManager.getLogger(PirateChainACCTv3TradeBot.class);
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public enum State implements TradeBot.StateNameAndValueSupplier {
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BOB_WAITING_FOR_AT_CONFIRM(10, false, false),
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BOB_WAITING_FOR_MESSAGE(15, true, true),
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BOB_WAITING_FOR_AT_REDEEM(25, true, true),
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BOB_DONE(30, false, false),
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BOB_REFUNDED(35, false, false),
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ALICE_WAITING_FOR_AT_LOCK(85, true, true),
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ALICE_DONE(95, false, false),
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ALICE_REFUNDING_A(105, true, true),
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ALICE_REFUNDED(110, false, false);
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private static final Map<Integer, State> map = stream(State.values()).collect(toMap(state -> state.value, state -> state));
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public final int value;
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public final boolean requiresAtData;
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public final boolean requiresTradeData;
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State(int value, boolean requiresAtData, boolean requiresTradeData) {
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this.value = value;
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this.requiresAtData = requiresAtData;
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this.requiresTradeData = requiresTradeData;
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}
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public static State valueOf(int value) {
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return map.get(value);
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}
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@Override
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public String getState() {
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return this.name();
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}
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@Override
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public int getStateValue() {
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return this.value;
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}
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}
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/** Maximum time Bob waits for his AT creation transaction to be confirmed into a block. (milliseconds) */
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private static final long MAX_AT_CONFIRMATION_PERIOD = 24 * 60 * 60 * 1000L; // ms
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private static PirateChainACCTv3TradeBot instance;
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private final List<String> endStates = Arrays.asList(State.BOB_DONE, State.BOB_REFUNDED, State.ALICE_DONE, State.ALICE_REFUNDING_A, State.ALICE_REFUNDED).stream()
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.map(State::name)
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.collect(Collectors.toUnmodifiableList());
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private PirateChainACCTv3TradeBot() {
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}
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public static synchronized PirateChainACCTv3TradeBot getInstance() {
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if (instance == null)
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instance = new PirateChainACCTv3TradeBot();
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return instance;
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}
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@Override
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public List<String> getEndStates() {
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return this.endStates;
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}
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/**
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* Creates a new trade-bot entry from the "Bob" viewpoint, i.e. OFFERing QORT in exchange for ARRR.
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* <p>
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* Generates:
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* <ul>
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* <li>new 'trade' private key</li>
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* </ul>
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* Derives:
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* <ul>
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* <li>'native' (as in Qortal) public key, public key hash, address (starting with Q)</li>
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* <li>'foreign' (as in PirateChain) public key, public key hash</li>
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* </ul>
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* A Qortal AT is then constructed including the following as constants in the 'data segment':
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* <ul>
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* <li>'native'/Qortal 'trade' address - used as a MESSAGE contact</li>
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* <li>'foreign'/PirateChain public key hash - used by Alice's P2SH scripts to allow redeem</li>
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* <li>QORT amount on offer by Bob</li>
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* <li>ARRR amount expected in return by Bob (from Alice)</li>
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* <li>trading timeout, in case things go wrong and everyone needs to refund</li>
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* </ul>
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* Returns a DEPLOY_AT transaction that needs to be signed and broadcast to the Qortal network.
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* <p>
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* Trade-bot will wait for Bob's AT to be deployed before taking next step.
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* <p>
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* @param repository
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* @param tradeBotCreateRequest
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* @return raw, unsigned DEPLOY_AT transaction
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* @throws DataException
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*/
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public byte[] createTrade(Repository repository, TradeBotCreateRequest tradeBotCreateRequest) throws DataException {
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byte[] tradePrivateKey = TradeBot.generateTradePrivateKey();
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byte[] tradeNativePublicKey = TradeBot.deriveTradeNativePublicKey(tradePrivateKey);
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byte[] tradeNativePublicKeyHash = Crypto.hash160(tradeNativePublicKey);
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String tradeNativeAddress = Crypto.toAddress(tradeNativePublicKey);
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byte[] tradeForeignPublicKey = TradeBot.deriveTradeForeignPublicKey(tradePrivateKey);
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byte[] tradeForeignPublicKeyHash = Crypto.hash160(tradeForeignPublicKey);
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if (!PirateChain.getInstance().isValidAddress(tradeBotCreateRequest.receivingAddress)) {
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throw new DataException("Unsupported Pirate Chain receiving address: " + tradeBotCreateRequest.receivingAddress);
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}
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Bech32.Bech32Data decodedReceivingAddress = Bech32.decode(tradeBotCreateRequest.receivingAddress);
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byte[] pirateChainReceivingAccountInfo = decodedReceivingAddress.data;
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PublicKeyAccount creator = new PublicKeyAccount(repository, tradeBotCreateRequest.creatorPublicKey);
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// Deploy AT
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long timestamp = NTP.getTime();
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byte[] reference = creator.getLastReference();
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long fee = 0L;
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byte[] signature = null;
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BaseTransactionData baseTransactionData = new BaseTransactionData(timestamp, Group.NO_GROUP, reference, creator.getPublicKey(), fee, signature);
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String name = "QORT/ARRR ACCT";
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String description = "QORT/ARRR cross-chain trade";
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String aTType = "ACCT";
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String tags = "ACCT QORT ARRR";
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byte[] creationBytes = PirateChainACCTv3.buildQortalAT(tradeNativeAddress, tradeForeignPublicKey, tradeBotCreateRequest.qortAmount,
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tradeBotCreateRequest.foreignAmount, tradeBotCreateRequest.tradeTimeout);
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long amount = tradeBotCreateRequest.fundingQortAmount;
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DeployAtTransactionData deployAtTransactionData = new DeployAtTransactionData(baseTransactionData, name, description, aTType, tags, creationBytes, amount, Asset.QORT);
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DeployAtTransaction deployAtTransaction = new DeployAtTransaction(repository, deployAtTransactionData);
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fee = deployAtTransaction.calcRecommendedFee();
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deployAtTransactionData.setFee(fee);
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DeployAtTransaction.ensureATAddress(deployAtTransactionData);
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String atAddress = deployAtTransactionData.getAtAddress();
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TradeBotData tradeBotData = new TradeBotData(tradePrivateKey, PirateChainACCTv3.NAME,
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State.BOB_WAITING_FOR_AT_CONFIRM.name(), State.BOB_WAITING_FOR_AT_CONFIRM.value,
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creator.getAddress(), atAddress, timestamp, tradeBotCreateRequest.qortAmount,
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tradeNativePublicKey, tradeNativePublicKeyHash, tradeNativeAddress,
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null, null,
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SupportedBlockchain.PIRATECHAIN.name(),
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tradeForeignPublicKey, tradeForeignPublicKeyHash,
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tradeBotCreateRequest.foreignAmount, null, null, null, pirateChainReceivingAccountInfo);
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TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Built AT %s. Waiting for deployment", atAddress));
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// Attempt to backup the trade bot data
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TradeBot.backupTradeBotData(repository, null);
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// Return to user for signing and broadcast as we don't have their Qortal private key
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try {
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return DeployAtTransactionTransformer.toBytes(deployAtTransactionData);
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} catch (TransformationException e) {
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throw new DataException("Failed to transform DEPLOY_AT transaction?", e);
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}
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}
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/**
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* Creates a trade-bot entry from the 'Alice' viewpoint, i.e. matching ARRR to an existing offer.
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* <p>
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* Requires a chosen trade offer from Bob, passed by <tt>crossChainTradeData</tt>
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* and access to a PirateChain wallet via <tt>xprv58</tt>.
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* <p>
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* The <tt>crossChainTradeData</tt> contains the current trade offer state
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* as extracted from the AT's data segment.
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* <p>
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* Access to a funded wallet is via a PirateChain BIP32 hierarchical deterministic key,
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* passed via <tt>xprv58</tt>.
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* <b>This key will be stored in your node's database</b>
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* to allow trade-bot to create/fund the necessary P2SH transactions!
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* However, due to the nature of BIP32 keys, it is possible to give the trade-bot
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* only a subset of wallet access (see BIP32 for more details).
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* <p>
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* As an example, the xprv58 can be extract from a <i>legacy, password-less</i>
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* Electrum wallet by going to the console tab and entering:<br>
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* <tt>wallet.keystore.xprv</tt><br>
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* which should result in a base58 string starting with either 'xprv' (for PirateChain main-net)
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* or 'tprv' for (PirateChain test-net).
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* <p>
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* It is envisaged that the value in <tt>xprv58</tt> will actually come from a Qortal-UI-managed wallet.
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* <p>
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* If sufficient funds are available, <b>this method will actually fund the P2SH-A</b>
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* with the PirateChain amount expected by 'Bob'.
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* <p>
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* If the PirateChain transaction is successfully broadcast to the network then
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* we also send a MESSAGE to Bob's trade-bot to let them know.
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* <p>
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* The trade-bot entry is saved to the repository and the cross-chain trading process commences.
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* <p>
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* @param repository
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* @param crossChainTradeData chosen trade OFFER that Alice wants to match
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* @param seed58 funded wallet xprv in base58
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* @return true if P2SH-A funding transaction successfully broadcast to PirateChain network, false otherwise
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* @throws DataException
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*/
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public ResponseResult startResponse(Repository repository, ATData atData, ACCT acct, CrossChainTradeData crossChainTradeData, String seed58, String receivingAddress) throws DataException {
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byte[] tradePrivateKey = TradeBot.generateTradePrivateKey();
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byte[] secretA = TradeBot.generateSecret();
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byte[] hashOfSecretA = Crypto.hash160(secretA);
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byte[] tradeNativePublicKey = TradeBot.deriveTradeNativePublicKey(tradePrivateKey);
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byte[] tradeNativePublicKeyHash = Crypto.hash160(tradeNativePublicKey);
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String tradeNativeAddress = Crypto.toAddress(tradeNativePublicKey);
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byte[] tradeForeignPublicKey = TradeBot.deriveTradeForeignPublicKey(tradePrivateKey);
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byte[] tradeForeignPublicKeyHash = Crypto.hash160(tradeForeignPublicKey);
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byte[] receivingPublicKeyHash = Base58.decode(receivingAddress); // Actually the whole address, not just PKH
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String tradePrivateKey58 = Base58.encode(tradePrivateKey);
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String tradeForeignPublicKey58 = Base58.encode(tradeForeignPublicKey);
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String secret58 = Base58.encode(secretA);
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// We need to generate lockTime-A: add tradeTimeout to now
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long now = NTP.getTime();
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int lockTimeA = crossChainTradeData.tradeTimeout * 60 + (int) (now / 1000L);
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TradeBotData tradeBotData = new TradeBotData(tradePrivateKey, PirateChainACCTv3.NAME,
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State.ALICE_WAITING_FOR_AT_LOCK.name(), State.ALICE_WAITING_FOR_AT_LOCK.value,
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receivingAddress, crossChainTradeData.qortalAtAddress, now, crossChainTradeData.qortAmount,
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tradeNativePublicKey, tradeNativePublicKeyHash, tradeNativeAddress,
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secretA, hashOfSecretA,
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SupportedBlockchain.PIRATECHAIN.name(),
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tradeForeignPublicKey, tradeForeignPublicKeyHash,
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crossChainTradeData.expectedForeignAmount, seed58, null, lockTimeA, receivingPublicKeyHash);
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// Attempt to backup the trade bot data
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// Include tradeBotData as an additional parameter, since it's not in the repository yet
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TradeBot.backupTradeBotData(repository, Arrays.asList(tradeBotData));
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// Check we have enough funds via xprv58 to fund P2SH to cover expectedForeignAmount
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long p2shFee;
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try {
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p2shFee = PirateChain.getInstance().getP2shFee(now);
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} catch (ForeignBlockchainException e) {
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LOGGER.debug("Couldn't estimate PirateChain fees?");
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return ResponseResult.NETWORK_ISSUE;
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}
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// Fee for redeem/refund is subtracted from P2SH-A balance.
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// Do not include fee for funding transaction as this is covered by buildSpend()
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long amountA = crossChainTradeData.expectedForeignAmount + p2shFee /*redeeming/refunding P2SH-A*/;
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// P2SH-A to be funded
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byte[] redeemScriptBytes = PirateChainHTLC.buildScript(tradeForeignPublicKey, lockTimeA, crossChainTradeData.creatorForeignPKH, hashOfSecretA);
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String p2shAddress = PirateChain.getInstance().deriveP2shAddress(redeemScriptBytes);
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byte[] redeemScriptWithPrefixBytes = PirateChainHTLC.buildScriptWithPrefix(tradeForeignPublicKey, lockTimeA, crossChainTradeData.creatorForeignPKH, hashOfSecretA);
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String redeemScriptWithPrefix58 = Base58.encode(redeemScriptWithPrefixBytes);
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// Send to P2SH address
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try {
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String txid = PirateChain.getInstance().fundP2SH(seed58, p2shAddress, amountA, redeemScriptWithPrefix58);
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LOGGER.info("fundingTxidHex: {}", txid);
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} catch (ForeignBlockchainException e) {
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LOGGER.debug("Unable to build and send P2SH-A funding transaction - lack of funds?");
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return ResponseResult.BALANCE_ISSUE;
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}
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// Attempt to send MESSAGE to Bob's Qortal trade address
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byte[] messageData = PirateChainACCTv3.buildOfferMessage(tradeBotData.getTradeForeignPublicKey(), tradeBotData.getHashOfSecret(), tradeBotData.getLockTimeA());
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String messageRecipient = crossChainTradeData.qortalCreatorTradeAddress;
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boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, messageData);
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if (!isMessageAlreadySent) {
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PrivateKeyAccount sender = new PrivateKeyAccount(repository, tradeBotData.getTradePrivateKey());
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MessageTransaction messageTransaction = MessageTransaction.build(repository, sender, Group.NO_GROUP, messageRecipient, messageData, false, false);
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messageTransaction.computeNonce();
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messageTransaction.sign(sender);
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// reset repository state to prevent deadlock
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repository.discardChanges();
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ValidationResult result = messageTransaction.importAsUnconfirmed();
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if (result != ValidationResult.OK) {
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LOGGER.warn(() -> String.format("Unable to send MESSAGE to Bob's trade-bot %s: %s", messageRecipient, result.name()));
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return ResponseResult.NETWORK_ISSUE;
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}
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}
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TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Funding P2SH-A %s. Messaged Bob. Waiting for AT-lock", p2shAddress));
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return ResponseResult.OK;
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}
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public static String hex(byte[] bytes) {
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StringBuilder result = new StringBuilder();
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for (byte aByte : bytes) {
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result.append(String.format("%02x", aByte));
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// upper case
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// result.append(String.format("%02X", aByte));
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}
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return result.toString();
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}
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@Override
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public boolean canDelete(Repository repository, TradeBotData tradeBotData) throws DataException {
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State tradeBotState = State.valueOf(tradeBotData.getStateValue());
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if (tradeBotState == null)
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return true;
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// If the AT doesn't exist then we might as well let the user tidy up
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if (!repository.getATRepository().exists(tradeBotData.getAtAddress()))
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return true;
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switch (tradeBotState) {
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case BOB_WAITING_FOR_AT_CONFIRM:
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case ALICE_DONE:
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case BOB_DONE:
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case ALICE_REFUNDED:
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case BOB_REFUNDED:
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case ALICE_REFUNDING_A:
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return true;
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default:
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return false;
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}
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}
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@Override
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public void progress(Repository repository, TradeBotData tradeBotData) throws DataException, ForeignBlockchainException {
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State tradeBotState = State.valueOf(tradeBotData.getStateValue());
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if (tradeBotState == null) {
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LOGGER.info(() -> String.format("Trade-bot entry for AT %s has invalid state?", tradeBotData.getAtAddress()));
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return;
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}
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ATData atData = null;
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CrossChainTradeData tradeData = null;
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if (tradeBotState.requiresAtData) {
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// Attempt to fetch AT data
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atData = repository.getATRepository().fromATAddress(tradeBotData.getAtAddress());
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if (atData == null) {
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LOGGER.debug(() -> String.format("Unable to fetch trade AT %s from repository", tradeBotData.getAtAddress()));
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return;
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}
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if (tradeBotState.requiresTradeData) {
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tradeData = PirateChainACCTv3.getInstance().populateTradeData(repository, atData);
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if (tradeData == null) {
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LOGGER.warn(() -> String.format("Unable to fetch ACCT trade data for AT %s from repository", tradeBotData.getAtAddress()));
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return;
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}
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}
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}
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switch (tradeBotState) {
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case BOB_WAITING_FOR_AT_CONFIRM:
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handleBobWaitingForAtConfirm(repository, tradeBotData);
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break;
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case BOB_WAITING_FOR_MESSAGE:
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TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
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handleBobWaitingForMessage(repository, tradeBotData, atData, tradeData);
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break;
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|
||||
case ALICE_WAITING_FOR_AT_LOCK:
|
||||
TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
|
||||
handleAliceWaitingForAtLock(repository, tradeBotData, atData, tradeData);
|
||||
break;
|
||||
|
||||
case BOB_WAITING_FOR_AT_REDEEM:
|
||||
TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
|
||||
handleBobWaitingForAtRedeem(repository, tradeBotData, atData, tradeData);
|
||||
break;
|
||||
|
||||
case ALICE_DONE:
|
||||
case BOB_DONE:
|
||||
break;
|
||||
|
||||
case ALICE_REFUNDING_A:
|
||||
TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
|
||||
handleAliceRefundingP2shA(repository, tradeBotData, atData, tradeData);
|
||||
break;
|
||||
|
||||
case ALICE_REFUNDED:
|
||||
case BOB_REFUNDED:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Trade-bot is waiting for Bob's AT to deploy.
|
||||
* <p>
|
||||
* If AT is deployed, then trade-bot's next step is to wait for MESSAGE from Alice.
|
||||
*/
|
||||
private void handleBobWaitingForAtConfirm(Repository repository, TradeBotData tradeBotData) throws DataException {
|
||||
if (!repository.getATRepository().exists(tradeBotData.getAtAddress())) {
|
||||
if (NTP.getTime() - tradeBotData.getTimestamp() <= MAX_AT_CONFIRMATION_PERIOD)
|
||||
return;
|
||||
|
||||
// We've waited ages for AT to be confirmed into a block but something has gone awry.
|
||||
// After this long we assume transaction loss so give up with trade-bot entry too.
|
||||
tradeBotData.setState(State.BOB_REFUNDED.name());
|
||||
tradeBotData.setStateValue(State.BOB_REFUNDED.value);
|
||||
tradeBotData.setTimestamp(NTP.getTime());
|
||||
// We delete trade-bot entry here instead of saving, hence not using updateTradeBotState()
|
||||
repository.getCrossChainRepository().delete(tradeBotData.getTradePrivateKey());
|
||||
repository.saveChanges();
|
||||
|
||||
LOGGER.info(() -> String.format("AT %s never confirmed. Giving up on trade", tradeBotData.getAtAddress()));
|
||||
TradeBot.notifyStateChange(tradeBotData);
|
||||
return;
|
||||
}
|
||||
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_WAITING_FOR_MESSAGE,
|
||||
() -> String.format("AT %s confirmed ready. Waiting for trade message", tradeBotData.getAtAddress()));
|
||||
}
|
||||
|
||||
/**
|
||||
* Trade-bot is waiting for MESSAGE from Alice's trade-bot, containing Alice's trade info.
|
||||
* <p>
|
||||
* It's possible Bob has cancelling his trade offer, receiving an automatic QORT refund,
|
||||
* in which case trade-bot is done with this specific trade and finalizes on refunded state.
|
||||
* <p>
|
||||
* Assuming trade is still on offer, trade-bot checks the contents of MESSAGE from Alice's trade-bot.
|
||||
* <p>
|
||||
* Details from Alice are used to derive P2SH-A address and this is checked for funding balance.
|
||||
* <p>
|
||||
* Assuming P2SH-A has at least expected PirateChain balance,
|
||||
* Bob's trade-bot constructs a zero-fee, PoW MESSAGE to send to Bob's AT with more trade details.
|
||||
* <p>
|
||||
* On processing this MESSAGE, Bob's AT should switch into 'TRADE' mode and only trade with Alice.
|
||||
* <p>
|
||||
* Trade-bot's next step is to wait for Alice to redeem the AT, which will allow Bob to
|
||||
* extract secret-A needed to redeem Alice's P2SH.
|
||||
* @throws ForeignBlockchainException
|
||||
*/
|
||||
private void handleBobWaitingForMessage(Repository repository, TradeBotData tradeBotData,
|
||||
ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
|
||||
// If AT has finished then Bob likely cancelled his trade offer
|
||||
if (atData.getIsFinished()) {
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_REFUNDED,
|
||||
() -> String.format("AT %s cancelled - trading aborted", tradeBotData.getAtAddress()));
|
||||
return;
|
||||
}
|
||||
|
||||
PirateChain pirateChain = PirateChain.getInstance();
|
||||
|
||||
String address = tradeBotData.getTradeNativeAddress();
|
||||
List<MessageTransactionData> messageTransactionsData = repository.getMessageRepository().getMessagesByParticipants(null, address, null, null, null);
|
||||
|
||||
for (MessageTransactionData messageTransactionData : messageTransactionsData) {
|
||||
if (messageTransactionData.isText())
|
||||
continue;
|
||||
|
||||
// We're expecting: HASH160(secret-A), Alice's PirateChain pubkeyhash and lockTime-A
|
||||
byte[] messageData = messageTransactionData.getData();
|
||||
PirateChainACCTv3.OfferMessageData offerMessageData = PirateChainACCTv3.extractOfferMessageData(messageData);
|
||||
if (offerMessageData == null)
|
||||
continue;
|
||||
|
||||
byte[] aliceForeignPublicKey = offerMessageData.partnerPirateChainPublicKey;
|
||||
byte[] hashOfSecretA = offerMessageData.hashOfSecretA;
|
||||
int lockTimeA = (int) offerMessageData.lockTimeA;
|
||||
long messageTimestamp = messageTransactionData.getTimestamp();
|
||||
int refundTimeout = PirateChainACCTv3.calcRefundTimeout(messageTimestamp, lockTimeA);
|
||||
|
||||
// Determine P2SH-A address and confirm funded
|
||||
byte[] redeemScriptA = PirateChainHTLC.buildScript(aliceForeignPublicKey, lockTimeA, tradeBotData.getTradeForeignPublicKey(), hashOfSecretA);
|
||||
String p2shAddressA = pirateChain.deriveP2shAddress(redeemScriptA);
|
||||
|
||||
long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
|
||||
long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
|
||||
final long minimumAmountA = tradeBotData.getForeignAmount() + p2shFee;
|
||||
|
||||
PirateChainHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddressA, minimumAmountA);
|
||||
|
||||
switch (htlcStatusA) {
|
||||
case UNFUNDED:
|
||||
case FUNDING_IN_PROGRESS:
|
||||
// There might be another MESSAGE from someone else with an actually funded P2SH-A...
|
||||
continue;
|
||||
|
||||
case REDEEM_IN_PROGRESS:
|
||||
case REDEEMED:
|
||||
// We've already redeemed this?
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_DONE,
|
||||
() -> String.format("P2SH-A %s already spent? Assuming trade complete", p2shAddressA));
|
||||
return;
|
||||
|
||||
case REFUND_IN_PROGRESS:
|
||||
case REFUNDED:
|
||||
// This P2SH-A is burnt, but there might be another MESSAGE from someone else with an actually funded P2SH-A...
|
||||
continue;
|
||||
|
||||
case FUNDED:
|
||||
// Fall-through out of switch...
|
||||
break;
|
||||
}
|
||||
|
||||
// Good to go - send MESSAGE to AT
|
||||
|
||||
String aliceNativeAddress = Crypto.toAddress(messageTransactionData.getCreatorPublicKey());
|
||||
|
||||
// Build outgoing message, padding each part to 32 bytes to make it easier for AT to consume
|
||||
byte[] outgoingMessageData = PirateChainACCTv3.buildTradeMessage(aliceNativeAddress, aliceForeignPublicKey, hashOfSecretA, lockTimeA, refundTimeout);
|
||||
String messageRecipient = tradeBotData.getAtAddress();
|
||||
|
||||
boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, outgoingMessageData);
|
||||
if (!isMessageAlreadySent) {
|
||||
PrivateKeyAccount sender = new PrivateKeyAccount(repository, tradeBotData.getTradePrivateKey());
|
||||
MessageTransaction outgoingMessageTransaction = MessageTransaction.build(repository, sender, Group.NO_GROUP, messageRecipient, outgoingMessageData, false, false);
|
||||
|
||||
outgoingMessageTransaction.computeNonce();
|
||||
outgoingMessageTransaction.sign(sender);
|
||||
|
||||
// reset repository state to prevent deadlock
|
||||
repository.discardChanges();
|
||||
ValidationResult result = outgoingMessageTransaction.importAsUnconfirmed();
|
||||
|
||||
if (result != ValidationResult.OK) {
|
||||
LOGGER.warn(() -> String.format("Unable to send MESSAGE to AT %s: %s", messageRecipient, result.name()));
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_WAITING_FOR_AT_REDEEM,
|
||||
() -> String.format("Locked AT %s to %s. Waiting for AT redeem", tradeBotData.getAtAddress(), aliceNativeAddress));
|
||||
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Trade-bot is waiting for Bob's AT to switch to TRADE mode and lock trade to Alice only.
|
||||
* <p>
|
||||
* It's possible that Bob has cancelled his trade offer in the mean time, or that somehow
|
||||
* this process has taken so long that we've reached P2SH-A's locktime, or that someone else
|
||||
* has managed to trade with Bob. In any of these cases, trade-bot switches to begin the refunding process.
|
||||
* <p>
|
||||
* Assuming Bob's AT is locked to Alice, trade-bot checks AT's state data to make sure it is correct.
|
||||
* <p>
|
||||
* If all is well, trade-bot then redeems AT using Alice's secret-A, releasing Bob's QORT to Alice.
|
||||
* <p>
|
||||
* In revealing a valid secret-A, Bob can then redeem the ARRR funds from P2SH-A.
|
||||
* <p>
|
||||
* @throws ForeignBlockchainException
|
||||
*/
|
||||
private void handleAliceWaitingForAtLock(Repository repository, TradeBotData tradeBotData,
|
||||
ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
|
||||
if (aliceUnexpectedState(repository, tradeBotData, atData, crossChainTradeData))
|
||||
return;
|
||||
|
||||
PirateChain pirateChain = PirateChain.getInstance();
|
||||
int lockTimeA = tradeBotData.getLockTimeA();
|
||||
|
||||
// Refund P2SH-A if we've passed lockTime-A
|
||||
if (NTP.getTime() >= lockTimeA * 1000L) {
|
||||
byte[] redeemScriptA = PirateChainHTLC.buildScript(tradeBotData.getTradeForeignPublicKey(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
|
||||
String p2shAddressA = pirateChain.deriveP2shAddress(redeemScriptA);
|
||||
|
||||
long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
|
||||
long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
|
||||
long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
|
||||
|
||||
PirateChainHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddressA, minimumAmountA);
|
||||
|
||||
switch (htlcStatusA) {
|
||||
case UNFUNDED:
|
||||
case FUNDING_IN_PROGRESS:
|
||||
case FUNDED:
|
||||
break;
|
||||
|
||||
case REDEEM_IN_PROGRESS:
|
||||
case REDEEMED:
|
||||
// Already redeemed?
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
|
||||
() -> String.format("P2SH-A %s already spent? Assuming trade completed", p2shAddressA));
|
||||
return;
|
||||
|
||||
case REFUND_IN_PROGRESS:
|
||||
case REFUNDED:
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDED,
|
||||
() -> String.format("P2SH-A %s already refunded. Trade aborted", p2shAddressA));
|
||||
return;
|
||||
|
||||
}
|
||||
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDING_A,
|
||||
() -> atData.getIsFinished()
|
||||
? String.format("AT %s cancelled. Refunding P2SH-A %s - aborting trade", tradeBotData.getAtAddress(), p2shAddressA)
|
||||
: String.format("LockTime-A reached, refunding P2SH-A %s - aborting trade", p2shAddressA));
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
// We're waiting for AT to be in TRADE mode
|
||||
if (crossChainTradeData.mode != AcctMode.TRADING)
|
||||
return;
|
||||
|
||||
// AT is in TRADE mode and locked to us as checked by aliceUnexpectedState() above
|
||||
|
||||
// Find our MESSAGE to AT from previous state
|
||||
List<MessageTransactionData> messageTransactionsData = repository.getMessageRepository().getMessagesByParticipants(tradeBotData.getTradeNativePublicKey(),
|
||||
crossChainTradeData.qortalCreatorTradeAddress, null, null, null);
|
||||
if (messageTransactionsData == null || messageTransactionsData.isEmpty()) {
|
||||
LOGGER.warn(() -> String.format("Unable to find our message to trade creator %s?", crossChainTradeData.qortalCreatorTradeAddress));
|
||||
return;
|
||||
}
|
||||
|
||||
long recipientMessageTimestamp = messageTransactionsData.get(0).getTimestamp();
|
||||
int refundTimeout = PirateChainACCTv3.calcRefundTimeout(recipientMessageTimestamp, lockTimeA);
|
||||
|
||||
// Our calculated refundTimeout should match AT's refundTimeout
|
||||
if (refundTimeout != crossChainTradeData.refundTimeout) {
|
||||
LOGGER.debug(() -> String.format("Trade AT refundTimeout '%d' doesn't match our refundTimeout '%d'", crossChainTradeData.refundTimeout, refundTimeout));
|
||||
// We'll eventually refund
|
||||
return;
|
||||
}
|
||||
|
||||
// We're good to redeem AT
|
||||
|
||||
// Send 'redeem' MESSAGE to AT using both secret
|
||||
byte[] secretA = tradeBotData.getSecret();
|
||||
String qortalReceivingAddress = Base58.encode(tradeBotData.getReceivingAccountInfo()); // Actually contains whole address, not just PKH
|
||||
byte[] messageData = PirateChainACCTv3.buildRedeemMessage(secretA, qortalReceivingAddress);
|
||||
String messageRecipient = tradeBotData.getAtAddress();
|
||||
|
||||
boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, messageData);
|
||||
if (!isMessageAlreadySent) {
|
||||
PrivateKeyAccount sender = new PrivateKeyAccount(repository, tradeBotData.getTradePrivateKey());
|
||||
MessageTransaction messageTransaction = MessageTransaction.build(repository, sender, Group.NO_GROUP, messageRecipient, messageData, false, false);
|
||||
|
||||
messageTransaction.computeNonce();
|
||||
messageTransaction.sign(sender);
|
||||
|
||||
// Reset repository state to prevent deadlock
|
||||
repository.discardChanges();
|
||||
ValidationResult result = messageTransaction.importAsUnconfirmed();
|
||||
|
||||
if (result != ValidationResult.OK) {
|
||||
LOGGER.warn(() -> String.format("Unable to send MESSAGE to AT %s: %s", messageRecipient, result.name()));
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
|
||||
() -> String.format("Redeeming AT %s. Funds should arrive at %s",
|
||||
tradeBotData.getAtAddress(), qortalReceivingAddress));
|
||||
}
|
||||
|
||||
/**
|
||||
* Trade-bot is waiting for Alice to redeem Bob's AT, thus revealing secret-A which is required to spend the ARRR funds from P2SH-A.
|
||||
* <p>
|
||||
* It's possible that Bob's AT has reached its trading timeout and automatically refunded QORT back to Bob. In which case,
|
||||
* trade-bot is done with this specific trade and finalizes in refunded state.
|
||||
* <p>
|
||||
* Assuming trade-bot can extract a valid secret-A from Alice's MESSAGE then trade-bot uses that to redeem the ARRR funds from P2SH-A
|
||||
* to Bob's 'foreign'/PirateChain trade legacy-format address, as derived from trade private key.
|
||||
* <p>
|
||||
* (This could potentially be 'improved' to send ARRR to any address of Bob's choosing by changing the transaction output).
|
||||
* <p>
|
||||
* If trade-bot successfully broadcasts the transaction, then this specific trade is done.
|
||||
* @throws ForeignBlockchainException
|
||||
*/
|
||||
private void handleBobWaitingForAtRedeem(Repository repository, TradeBotData tradeBotData,
|
||||
ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
|
||||
// AT should be 'finished' once Alice has redeemed QORT funds
|
||||
if (!atData.getIsFinished())
|
||||
// Not finished yet
|
||||
return;
|
||||
|
||||
// If AT is REFUNDED or CANCELLED then something has gone wrong
|
||||
if (crossChainTradeData.mode == AcctMode.REFUNDED || crossChainTradeData.mode == AcctMode.CANCELLED) {
|
||||
// Alice hasn't redeemed the QORT, so there is no point in trying to redeem the ARRR
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_REFUNDED,
|
||||
() -> String.format("AT %s has auto-refunded - trade aborted", tradeBotData.getAtAddress()));
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
byte[] secretA = PirateChainACCTv3.getInstance().findSecretA(repository, crossChainTradeData);
|
||||
if (secretA == null) {
|
||||
LOGGER.debug(() -> String.format("Unable to find secret-A from redeem message to AT %s?", tradeBotData.getAtAddress()));
|
||||
return;
|
||||
}
|
||||
|
||||
// Use secret-A to redeem P2SH-A
|
||||
|
||||
PirateChain pirateChain = PirateChain.getInstance();
|
||||
|
||||
byte[] receivingAccountInfo = tradeBotData.getReceivingAccountInfo();
|
||||
int lockTimeA = crossChainTradeData.lockTimeA;
|
||||
byte[] redeemScriptA = PirateChainHTLC.buildScript(crossChainTradeData.partnerForeignPKH, lockTimeA, crossChainTradeData.creatorForeignPKH, crossChainTradeData.hashOfSecretA);
|
||||
String p2shAddressA = pirateChain.deriveP2shAddress(redeemScriptA);
|
||||
|
||||
// Fee for redeem/refund is subtracted from P2SH-A balance.
|
||||
long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
|
||||
long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
|
||||
long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
|
||||
String receivingAddress = Bech32.encode("zs", receivingAccountInfo);
|
||||
|
||||
PirateChainHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddressA, minimumAmountA);
|
||||
|
||||
switch (htlcStatusA) {
|
||||
case UNFUNDED:
|
||||
case FUNDING_IN_PROGRESS:
|
||||
// P2SH-A suddenly not funded? Our best bet at this point is to hope for AT auto-refund
|
||||
return;
|
||||
|
||||
case REDEEM_IN_PROGRESS:
|
||||
case REDEEMED:
|
||||
// Double-check that we have redeemed P2SH-A...
|
||||
break;
|
||||
|
||||
case REFUND_IN_PROGRESS:
|
||||
case REFUNDED:
|
||||
// Wait for AT to auto-refund
|
||||
return;
|
||||
|
||||
case FUNDED: {
|
||||
// Get funding txid
|
||||
String fundingTxidHex = PirateChainHTLC.getUnspentFundingTxid(pirateChain.getBlockchainProvider(), p2shAddressA, minimumAmountA);
|
||||
if (fundingTxidHex == null) {
|
||||
throw new ForeignBlockchainException("Missing funding txid when redeeming P2SH");
|
||||
}
|
||||
String fundingTxid58 = Base58.encode(HashCode.fromString(fundingTxidHex).asBytes());
|
||||
|
||||
// Redeem P2SH
|
||||
Coin redeemAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
|
||||
byte[] privateKey = tradeBotData.getTradePrivateKey();
|
||||
String secret58 = Base58.encode(secretA);
|
||||
String privateKey58 = Base58.encode(privateKey);
|
||||
String redeemScript58 = Base58.encode(redeemScriptA);
|
||||
|
||||
String txid = PirateChain.getInstance().redeemP2sh(tradeBotData.getForeignKey(), p2shAddressA,
|
||||
receivingAddress, redeemAmount.value, redeemScript58, fundingTxid58, secret58, privateKey58);
|
||||
LOGGER.info("Redeem txid: {}", txid);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_DONE,
|
||||
() -> String.format("P2SH-A %s redeemed. Funds should arrive at %s", tradeBotData.getAtAddress(), receivingAddress));
|
||||
}
|
||||
|
||||
/**
|
||||
* Trade-bot is attempting to refund P2SH-A.
|
||||
* @throws ForeignBlockchainException
|
||||
*/
|
||||
private void handleAliceRefundingP2shA(Repository repository, TradeBotData tradeBotData,
|
||||
ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
|
||||
int lockTimeA = tradeBotData.getLockTimeA();
|
||||
|
||||
// We can't refund P2SH-A until lockTime-A has passed
|
||||
if (NTP.getTime() <= lockTimeA * 1000L)
|
||||
return;
|
||||
|
||||
PirateChain pirateChain = PirateChain.getInstance();
|
||||
|
||||
// We can't refund P2SH-A until median block time has passed lockTime-A (see BIP113)
|
||||
int medianBlockTime = pirateChain.getMedianBlockTime();
|
||||
if (medianBlockTime <= lockTimeA)
|
||||
return;
|
||||
|
||||
byte[] redeemScriptA = PirateChainHTLC.buildScript(tradeBotData.getTradeForeignPublicKey(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
|
||||
String p2shAddressA = pirateChain.deriveP2shAddress(redeemScriptA);
|
||||
|
||||
// Fee for redeem/refund is subtracted from P2SH-A balance.
|
||||
long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
|
||||
long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
|
||||
long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
|
||||
PirateChainHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddressA, minimumAmountA);
|
||||
|
||||
switch (htlcStatusA) {
|
||||
case UNFUNDED:
|
||||
case FUNDING_IN_PROGRESS:
|
||||
// Still waiting for P2SH-A to be funded...
|
||||
return;
|
||||
|
||||
case REDEEM_IN_PROGRESS:
|
||||
case REDEEMED:
|
||||
// Too late!
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
|
||||
() -> String.format("P2SH-A %s already spent!", p2shAddressA));
|
||||
return;
|
||||
|
||||
case REFUND_IN_PROGRESS:
|
||||
case REFUNDED:
|
||||
break;
|
||||
|
||||
case FUNDED:{
|
||||
// Get funding txid
|
||||
String fundingTxidHex = PirateChainHTLC.getUnspentFundingTxid(pirateChain.getBlockchainProvider(), p2shAddressA, minimumAmountA);
|
||||
if (fundingTxidHex == null) {
|
||||
throw new ForeignBlockchainException("Missing funding txid when refunding P2SH");
|
||||
}
|
||||
String fundingTxid58 = Base58.encode(HashCode.fromString(fundingTxidHex).asBytes());
|
||||
|
||||
Coin refundAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
|
||||
byte[] privateKey = tradeBotData.getTradePrivateKey();
|
||||
String privateKey58 = Base58.encode(privateKey);
|
||||
String redeemScript58 = Base58.encode(redeemScriptA);
|
||||
String receivingAddress = pirateChain.getWalletAddress(tradeBotData.getForeignKey());
|
||||
|
||||
String txid = PirateChain.getInstance().refundP2sh(tradeBotData.getForeignKey(), p2shAddressA,
|
||||
receivingAddress, refundAmount.value, redeemScript58, fundingTxid58, lockTimeA, privateKey58);
|
||||
LOGGER.info("Refund txid: {}", txid);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDED,
|
||||
() -> String.format("LockTime-A reached. Refunded P2SH-A %s. Trade aborted", p2shAddressA));
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns true if Alice finds AT unexpectedly cancelled, refunded, redeemed or locked to someone else.
|
||||
* <p>
|
||||
* Will automatically update trade-bot state to <tt>ALICE_REFUNDING_A</tt> or <tt>ALICE_DONE</tt> as necessary.
|
||||
*
|
||||
* @throws DataException
|
||||
* @throws ForeignBlockchainException
|
||||
*/
|
||||
private boolean aliceUnexpectedState(Repository repository, TradeBotData tradeBotData,
|
||||
ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
|
||||
// This is OK
|
||||
if (!atData.getIsFinished() && crossChainTradeData.mode == AcctMode.OFFERING)
|
||||
return false;
|
||||
|
||||
boolean isAtLockedToUs = tradeBotData.getTradeNativeAddress().equals(crossChainTradeData.qortalPartnerAddress);
|
||||
|
||||
if (!atData.getIsFinished() && crossChainTradeData.mode == AcctMode.TRADING)
|
||||
if (isAtLockedToUs) {
|
||||
// AT is trading with us - OK
|
||||
return false;
|
||||
} else {
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDING_A,
|
||||
() -> String.format("AT %s trading with someone else: %s. Refunding & aborting trade", tradeBotData.getAtAddress(), crossChainTradeData.qortalPartnerAddress));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
if (atData.getIsFinished() && crossChainTradeData.mode == AcctMode.REDEEMED && isAtLockedToUs) {
|
||||
// We've redeemed already?
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
|
||||
() -> String.format("AT %s already redeemed by us. Trade completed", tradeBotData.getAtAddress()));
|
||||
} else {
|
||||
// Any other state is not good, so start defensive refund
|
||||
TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDING_A,
|
||||
() -> String.format("AT %s cancelled/refunded/redeemed by someone else/invalid state. Refunding & aborting trade", tradeBotData.getAtAddress()));
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
private long calcFeeTimestamp(int lockTimeA, int tradeTimeout) {
|
||||
return (lockTimeA - tradeTimeout * 60) * 1000L;
|
||||
}
|
||||
|
||||
}
|
||||
@ -102,6 +102,7 @@ public class TradeBot implements Listener {
|
||||
acctTradeBotSuppliers.put(DogecoinACCTv3.class, DogecoinACCTv3TradeBot::getInstance);
|
||||
acctTradeBotSuppliers.put(DigibyteACCTv3.class, DigibyteACCTv3TradeBot::getInstance);
|
||||
acctTradeBotSuppliers.put(RavencoinACCTv3.class, RavencoinACCTv3TradeBot::getInstance);
|
||||
acctTradeBotSuppliers.put(PirateChainACCTv3.class, PirateChainACCTv3TradeBot::getInstance);
|
||||
}
|
||||
|
||||
private static TradeBot instance;
|
||||
|
||||
@ -85,6 +85,20 @@ public enum SupportedBlockchain {
|
||||
public ACCT getLatestAcct() {
|
||||
return RavencoinACCTv3.getInstance();
|
||||
}
|
||||
},
|
||||
|
||||
PIRATECHAIN(Arrays.asList(
|
||||
Triple.valueOf(PirateChainACCTv3.NAME, PirateChainACCTv3.CODE_BYTES_HASH, PirateChainACCTv3::getInstance)
|
||||
)) {
|
||||
@Override
|
||||
public ForeignBlockchain getInstance() {
|
||||
return PirateChain.getInstance();
|
||||
}
|
||||
|
||||
@Override
|
||||
public ACCT getLatestAcct() {
|
||||
return PirateChainACCTv3.getInstance();
|
||||
}
|
||||
};
|
||||
|
||||
private static final Map<ByteArray, Supplier<ACCT>> supportedAcctsByCodeHash = Arrays.stream(SupportedBlockchain.values())
|
||||
|
||||
Loading…
Reference in New Issue
Block a user