@atomiqlabs/chain-evm
Version:
EVM specific base implementation
60 lines (59 loc) • 2.66 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.BitcoinNoncedOutputClaimHandler = void 0;
const base_1 = require("@atomiqlabs/base");
const IBitcoinClaimHandler_1 = require("./IBitcoinClaimHandler");
const btc_signer_1 = require("@scure/btc-signer");
const buffer_1 = require("buffer");
const ethers_1 = require("ethers");
function getTransactionNonce(btcTx) {
const locktimeSub500M = BigInt(btcTx.lockTime - 500000000);
if (locktimeSub500M < 0n)
throw new Error("Locktime too low!");
const nSequence = BigInt(btcTx.getInput(0).sequence);
return (locktimeSub500M << 24n) | (nSequence & 0x00ffffffn);
}
class BitcoinNoncedOutputClaimHandler extends IBitcoinClaimHandler_1.IBitcoinClaimHandler {
serializeCommitment(data) {
const txoHash = (0, ethers_1.solidityPackedKeccak256)(["uint64", "uint64", "bytes32"], [data.nonce, data.amount, (0, ethers_1.keccak256)(data.output)]);
return buffer_1.Buffer.concat([
buffer_1.Buffer.from(txoHash.substring(2), "hex"),
super.serializeCommitment(data)
]);
}
async getWitness(signer, swapData, witnessData, feeRate) {
if (!swapData.isClaimHandler(this.address))
throw new Error("Invalid claim handler");
const txBuffer = buffer_1.Buffer.from(witnessData.tx.hex, "hex");
const parsedBtcTx = btc_signer_1.Transaction.fromRaw(txBuffer);
const out = parsedBtcTx.getOutput(witnessData.vout);
const { initialTxns, commitment, blockheader, merkleProof } = await this._getWitness(signer, swapData, witnessData, {
output: buffer_1.Buffer.from(out.script),
amount: out.amount,
nonce: getTransactionNonce(parsedBtcTx)
});
const voutAndTxData = buffer_1.Buffer.concat([
base_1.BigIntBufferUtils.toBuffer(BigInt(witnessData.vout), "be", 4),
base_1.BigIntBufferUtils.toBuffer(BigInt(txBuffer.length), "be", 32),
txBuffer
]);
return {
initialTxns,
witness: buffer_1.Buffer.concat([
commitment,
blockheader,
voutAndTxData,
merkleProof
])
};
}
getGas(data) {
return BitcoinNoncedOutputClaimHandler.gas;
}
getType() {
return BitcoinNoncedOutputClaimHandler.type;
}
}
exports.BitcoinNoncedOutputClaimHandler = BitcoinNoncedOutputClaimHandler;
BitcoinNoncedOutputClaimHandler.type = base_1.ChainSwapType.CHAIN_NONCED;
BitcoinNoncedOutputClaimHandler.gas = 40000;