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Added /refund/LITECOIN/{ataddress} API

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This is designed to be called by the buyer, and will force refund their P2SH transaction associated with the supplied AT. The tradebot responsible for this trade must be present in the user's db for this API access the necessary data. It must be called after lockTime has passed, which for LTC is currently 60 minutes from the time that the P2SH was funded. Trying to refund before this time will result in a FOREIGN_BLOCKCHAIN_TOO_SOON error.
This commit is contained in:
CalDescent 2021-05-22 10:09:28 +01:00
parent 326ef498b0
commit 39575e8542
1 changed files with 95 additions and 2 deletions
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97
src/main/java/org/qortal/api/resource/CrossChainHtlcResource.java
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@ -28,6 +28,7 @@ import org.qortal.api.model.CrossChainBitcoinyHTLCStatus;
import org.qortal.crosschain.*;
import org.qortal.data.at.ATData;
import org.qortal.data.crosschain.CrossChainTradeData;
import org.qortal.data.crosschain.TradeBotData;
import org.qortal.repository.DataException;
import org.qortal.repository.Repository;
import org.qortal.repository.RepositoryManager;
@ -174,8 +175,6 @@ public class CrossChainHtlcResource {
}
}
// TODO: refund
@GET
@Path("/redeem/LITECOIN/{ataddress}/{tradePrivateKey}/{secret}/{receivingAddress}")
@Operation(
@ -282,6 +281,100 @@ public class CrossChainHtlcResource {
return false;
}
@GET
@Path("/refund/LITECOIN/{ataddress}")
@Operation(
summary = "Refunds HTLC associated with supplied AT",
responses = {
@ApiResponse(
content = @Content(mediaType = MediaType.TEXT_PLAIN, schema = @Schema(type = "boolean"))
)
}
)
@ApiErrors({ApiError.INVALID_CRITERIA, ApiError.INVALID_ADDRESS, ApiError.ADDRESS_UNKNOWN})
public boolean refundHtlc(@PathParam("ataddress") String atAddress) {
Security.checkApiCallAllowed(request);
try (final Repository repository = RepositoryManager.getRepository()) {
ATData atData = repository.getATRepository().fromATAddress(atAddress);
if (atData == null)
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.ADDRESS_UNKNOWN);
ACCT acct = SupportedBlockchain.getAcctByCodeHash(atData.getCodeHash());
if (acct == null)
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
CrossChainTradeData crossChainTradeData = acct.populateTradeData(repository, atData);
if (crossChainTradeData == null)
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
List<TradeBotData> allTradeBotData = repository.getCrossChainRepository().getAllTradeBotData();
TradeBotData tradeBotData = allTradeBotData.stream().filter(tradeBotDataItem -> tradeBotDataItem.getAtAddress().equals(atAddress)).findFirst().orElse(null);
if (tradeBotData == null)
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
int lockTime = tradeBotData.getLockTimeA();
// We can't refund P2SH-A until lockTime-A has passed
if (NTP.getTime() <= lockTime * 1000L)
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_TOO_SOON);
Litecoin litecoin = Litecoin.getInstance();
// We can't refund P2SH-A until median block time has passed lockTime-A (see BIP113)
int medianBlockTime = litecoin.getMedianBlockTime();
if (medianBlockTime <= lockTime)
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_TOO_SOON);
byte[] redeemScriptA = BitcoinyHTLC.buildScript(tradeBotData.getTradeForeignPublicKeyHash(), lockTime, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
String p2shAddressA = litecoin.deriveP2shAddress(redeemScriptA);
// Fee for redeem/refund is subtracted from P2SH-A balance.
long feeTimestamp = calcFeeTimestamp(lockTime, crossChainTradeData.tradeTimeout);
long p2shFee = Litecoin.getInstance().getP2shFee(feeTimestamp);
long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(litecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
switch (htlcStatusA) {
case UNFUNDED:
case FUNDING_IN_PROGRESS:
// Still waiting for P2SH-A to be funded...
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_TOO_SOON);
case REDEEM_IN_PROGRESS:
case REDEEMED:
case REFUND_IN_PROGRESS:
case REFUNDED:
// Too late!
return false;
case FUNDED:{
Coin refundAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
ECKey refundKey = ECKey.fromPrivate(tradeBotData.getTradePrivateKey());
List<TransactionOutput> fundingOutputs = litecoin.getUnspentOutputs(p2shAddressA);
// Determine receive address for refund
String receiveAddress = litecoin.getUnusedReceiveAddress(tradeBotData.getForeignKey());
Address receiving = Address.fromString(litecoin.getNetworkParameters(), receiveAddress);
Transaction p2shRefundTransaction = BitcoinyHTLC.buildRefundTransaction(litecoin.getNetworkParameters(), refundAmount, refundKey,
fundingOutputs, redeemScriptA, lockTime, receiving.getHash());
litecoin.broadcastTransaction(p2shRefundTransaction);
return true; // TODO: validate?
}
}
} catch (DataException e) {
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
} catch (ForeignBlockchainException e) {
throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_BALANCE_ISSUE, e);
}
return false;
}
private long calcFeeTimestamp(int lockTimeA, int tradeTimeout) {
return (lockTimeA - tradeTimeout * 60) * 1000L;
}