Merge pull request #7284 from alvasw/BtcWalletV2_Implement_addMiningF…

…eesToBsqTx

BtcWalletV2: Implement addMiningFeesToBsqTx

core/src/main/java/bisq/core/btc/wallet/BtcWalletV2.java

@@ -0,0 +1,35 @@
+package bisq.core.btc.wallet;
+
+import org.bitcoinj.core.Coin;
+import org.bitcoinj.core.InsufficientMoneyException;
+import org.bitcoinj.core.Transaction;
+import org.bitcoinj.wallet.CoinSelector;
+import org.bitcoinj.wallet.SendRequest;
+import org.bitcoinj.wallet.Wallet;
+
+public class BtcWalletV2 {
+    private final CoinSelector coinSelector;
+    private final Wallet wallet;
+
+    public BtcWalletV2(CoinSelector coinSelector, Wallet wallet) {
+        this.coinSelector = coinSelector;
+        this.wallet = wallet;
+    }
+
+    public Transaction addMiningFeesToBsqTx(Transaction bsqTx, Coin txFee) throws InsufficientMoneyException {
+        int signOffset = bsqTx.getInputs().size();
+
+        SendRequest sendRequest = SendRequest.forTx(bsqTx);
+        sendRequest.ensureMinRequiredFee = true;
+        sendRequest.feePerKb = txFee;
+        sendRequest.shuffleOutputs = false;
+        sendRequest.signInputs = false;
+        sendRequest.coinSelector = coinSelector;
+
+        wallet.completeTx(sendRequest);
+
+        Transaction finalTx = sendRequest.tx;
+        BisqTransactionSigner.sign(wallet, finalTx, signOffset);
+        return finalTx;
+    }
+}