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Added PirateChainHTLC.getFundingTxid(), to lookup the txid that funded a P2SH.
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@@ -173,6 +173,69 @@ public class PirateChainHTLC {
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return null;
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}
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/**
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* Returns a string containing the txid of the transaction that funded supplied <tt>p2shAddress</tt>
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* We have to do this in a bit of a roundabout way due to the Pirate Light Client server omitting
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* transaction hashes from the raw transaction data.
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* <p>
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* @throws ForeignBlockchainException if error occurs
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*/
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public static String getFundingTxid(BitcoinyBlockchainProvider blockchain, String p2shAddress) throws ForeignBlockchainException {
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byte[] ourScriptPubKey = addressToScriptPubKey(p2shAddress);
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// HASH160(redeem script) for this p2shAddress
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byte[] ourRedeemScriptHash = addressToRedeemScriptHash(p2shAddress);
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// Firstly look for an unspent output
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// Note: we can't include unconfirmed transactions here because the Pirate light wallet server requires a block range
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List<UnspentOutput> unspentOutputs = blockchain.getUnspentOutputs(p2shAddress, false);
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for (UnspentOutput unspentOutput : unspentOutputs) {
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if (!Arrays.equals(ourScriptPubKey, unspentOutput.script)) {
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continue;
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}
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return HashCode.fromBytes(unspentOutput.hash).toString();
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}
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// No valid unspent outputs, so must be already spent...
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// Note: we can't include unconfirmed transactions here because the Pirate light wallet server requires a block range
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List<BitcoinyTransaction> transactions = blockchain.getAddressBitcoinyTransactions(p2shAddress, BitcoinyBlockchainProvider.EXCLUDE_UNCONFIRMED);
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// Sort by confirmed first, followed by ascending height
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transactions.sort(BitcoinyTransaction.CONFIRMED_FIRST.thenComparing(BitcoinyTransaction::getHeight));
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for (BitcoinyTransaction bitcoinyTransaction : transactions) {
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// Acceptable funding is one transaction output, so we're expecting only one input
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if (bitcoinyTransaction.inputs.size() != 1)
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// Wrong number of inputs
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continue;
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String scriptSig = bitcoinyTransaction.inputs.get(0).scriptSig;
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List<byte[]> scriptSigChunks = extractScriptSigChunks(HashCode.fromString(scriptSig).asBytes());
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if (scriptSigChunks.size() < 3 || scriptSigChunks.size() > 4)
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// Not valid chunks for our form of HTLC
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continue;
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// Last chunk is redeem script
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byte[] redeemScriptBytes = scriptSigChunks.get(scriptSigChunks.size() - 1);
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byte[] redeemScriptHash = Crypto.hash160(redeemScriptBytes);
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if (!Arrays.equals(redeemScriptHash, ourRedeemScriptHash))
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// Not spending our specific HTLC redeem script
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continue;
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return bitcoinyTransaction.inputs.get(0).outputTxHash;
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}
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return null;
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}
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/**
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* Returns HTLC status, given P2SH address and expected redeem/refund amount
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* <p>
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