feat: add function that gets input for given script, add function exp…

…orts (#13)

package.json

@@ -1,7 +1,7 @@
 {
   "type": "module",
   "name": "dlc-btc-lib",
-  "version": "1.0.16",
+  "version": "1.0.17",
   "description": "This library provides a comprehensive set of interfaces and functions for minting dlcBTC tokens on supported blockchains.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/functions/bitcoin/bitcoin-functions.ts

@@ -435,6 +435,26 @@ export function validateScript(script: Uint8Array, outputScript: Uint8Array): bo
   );
 }
 
+export function getInputIndicesByScript(script: Uint8Array, transaction: Transaction): number[] {
+  const inputIndices: number[] = [];
+
+  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 === script.length &&
+      inputScript.every((value, index) => value === script[index])
+    ) {
+      inputIndices.push(index);
+    }
+  });
+  return inputIndices;
+}
+
 export function finalizeUserInputs(
   transaction: Transaction,
   userPayment: P2TROut | P2Ret

src/functions/bitcoin/index.ts

@@ -1,4 +1,9 @@
-import { finalizeUserInputs, getFeeAmount } from '../bitcoin/bitcoin-functions.js';
+import {
+  finalizeUserInputs,
+  getFeeAmount,
+  getFeeRecipientAddressFromPublicKey,
+  getInputIndicesByScript,
+} from '../bitcoin/bitcoin-functions.js';
 import {
   broadcastTransaction,
   fetchBitcoinBlockchainBlockHeight,
@@ -21,4 +26,6 @@ export {
   finalizeUserInputs,
   getFeeAmount,
   getBalance,
+  getFeeRecipientAddressFromPublicKey,
+  getInputIndicesByScript,
 };