feat: add user input finalization function

src/dlc-handlers/private-key-dlc-handler.ts

@@ -10,6 +10,7 @@ import {
   createTaprootMultisigPayment,
   deriveUnhardenedKeyPairFromRootPrivateKey,
   deriveUnhardenedPublicKey,
+  finalizeUserInputIndices,
   getBalance,
   getFeeRate,
   getUnspendableKeyCommittedToUUID,
@@ -263,7 +264,7 @@ export class PrivateKeyDLCHandler {
     }
   }
 
-  signPSBT(psbt: Transaction, transactionType: 'funding' | 'deposit' | 'closing'): Transaction {
+  signPSBT(psbt: Transaction, transactionType: 'funding' | 'deposit' | 'withdraw'): Transaction {
     switch (transactionType) {
       case 'funding':
         psbt.sign(this.getPrivateKey('p2wpkh'));
@@ -272,8 +273,9 @@ export class PrivateKeyDLCHandler {
       case 'deposit':
         psbt.sign(this.getPrivateKey('p2tr'));
         psbt.sign(this.getPrivateKey('p2wpkh'));
+        finalizeUserInputIndices(psbt, this.getPayment().nativeSegwitPayment);
         break;
-      case 'closing':
+      case 'withdraw':
         psbt.sign(this.getPrivateKey('p2tr'));
         break;
       default:

src/dlc-handlers/software-wallet-dlc-handler.ts

@@ -222,8 +222,6 @@ export class SoftwareWalletDLCHandler {
         customFeeRate ??
         BigInt(await getFeeRate(this.bitcoinBlockchainFeeRecommendationAPI, feeRateMultiplier));
 
-      console.log('vault', vault);
-
       const withdrawalTransaction = await createWithdrawalTransaction(
         this.bitcoinBlockchainAPI,
         withdrawAmount,

src/functions/bitcoin/bitcoin-functions.ts

@@ -428,6 +428,29 @@ export function validateScript(script: Uint8Array, outputScript: Uint8Array): bo
   );
 }
 
+export function finalizeUserInputIndices(
+  transaction: Transaction,
+  userPayment: P2TROut | P2Ret
+): Transaction {
+  const userPaymentScript = userPayment.script;
+  createRangeFromLength(transaction.inputsLength).forEach(index => {
+    const inputScript = transaction.getInput(index).witnessUtxo?.script;
+
+    if (!inputScript) {
+      throw new Error('Could not get Input Script');
+    }
+
+    if (
+      inputScript.length === userPaymentScript.length &&
+      inputScript.every((value, index) => value === userPaymentScript[index])
+    ) {
+      transaction.finalizeIdx(index);
+    }
+  });
+
+  return transaction;
+}
+
 /**
  * Converts an ECDSA Public Key to a Schnorr Public Key.
  * @param publicKey - The ECDSA Public Key.

src/functions/bitcoin/psbt-functions.ts

@@ -57,7 +57,13 @@ export async function createFundingTransaction(
     network: bitcoinNetwork,
   });
 
-  const fundingTX = selected?.tx;
+  if (!selected) {
+    throw new Error(
+      'Failed to select Inputs for the Funding Transaction. Ensure sufficient funds are available.'
+    );
+  }
+
+  const fundingTX = selected.tx;
 
   if (!fundingTX) throw new Error('Could not create Funding Transaction');
 
@@ -127,8 +133,6 @@ export async function createDepositTransaction(
 
   const userUTXOs = await getUTXOs(depositPayment, bitcoinBlockchainURL);
 
-  console.log('userUTXOs', userUTXOs);
-
   const additionalDepositOutputs = [
     {
       address: feeAddress,
@@ -140,8 +144,6 @@ export async function createDepositTransaction(
     },
   ];
 
-  console.log('additionalDepositOutputs', additionalDepositOutputs);
-
   const additionalDepositSelected = selectUTXO(userUTXOs, additionalDepositOutputs, 'default', {
     changeAddress: depositPaymentAddress,
     feePerByte: feeRate,
@@ -150,8 +152,6 @@ export async function createDepositTransaction(
     network: bitcoinNetwork,
   });
 
-  console.log('additionalDepositSelected', additionalDepositSelected);
-
   if (!additionalDepositSelected) {
     throw new Error(
       'Failed to select Inputs for the Additional Deposit Transaction. Ensure sufficient funds are available.'
@@ -168,20 +168,17 @@ export async function createDepositTransaction(
     ...multisigPayment,
   };
 
-  const depositInputPromises = additionalDepositSelected.inputs.map(async input => {
-    const txID = input.txid;
-    if (!txID) {
-      throw new Error('Could not get Transaction ID from Input');
-    }
-    const utxo = userUTXOs.find((utxo: any) => utxo.txid === txID && utxo.index === input.index);
-    console.log('utxo', utxo);
-    if (utxo) {
-      return utxo;
-    }
-  });
+  const depositInputPromises = additionalDepositSelected.inputs
+    .map(async input => {
+      const txID = input.txid;
+      if (!txID) {
+        throw new Error('Could not get Transaction ID from Input');
+      }
+      return userUTXOs.find((utxo: any) => utxo.txid === txID && utxo.index === input.index);
+    })
+    .filter(utxo => utxo !== undefined);
 
   const depositInputs = await Promise.all(depositInputPromises);
-  console.log('depositInputs', depositInputs);
   depositInputs.push(vaultInput);
 
   const depositOutputs = [
@@ -203,8 +200,6 @@ export async function createDepositTransaction(
     network: bitcoinNetwork,
   });
 
-  console.log('depositSelected', depositSelected);
-
   if (!depositSelected) {
     throw new Error(
       'Failed to select Inputs for the Deposit Transaction. Ensure sufficient funds are available.'
@@ -316,7 +311,13 @@ export async function createWithdrawalTransaction(
     network: bitcoinNetwork,
   });
 
-  const withdrawTX = selected?.tx;
+  if (!selected) {
+    throw new Error(
+      'Failed to select Inputs for the Withdrawal Transaction. Ensure sufficient funds are available.'
+    );
+  }
+
+  const withdrawTX = selected.tx;
 
   if (!withdrawTX) throw new Error('Could not create Withdrawal Transaction');