From bb144977e02cb130804851444a25fef0590a850e Mon Sep 17 00:00:00 2001
From: Tomasz Slabon <tomasz.slabon@keep.network>
Date: Wed, 25 Oct 2023 17:00:54 +0200
Subject: [PATCH] Verify Bitcoin redeemer script

---
 .../src/services/redemptions/redemptions-service.ts    | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/typescript/src/services/redemptions/redemptions-service.ts b/typescript/src/services/redemptions/redemptions-service.ts
index 363f0454a..03673ce8b 100644
--- a/typescript/src/services/redemptions/redemptions-service.ts
+++ b/typescript/src/services/redemptions/redemptions-service.ts
@@ -7,6 +7,7 @@ import {
   BitcoinAddressConverter,
   BitcoinClient,
   BitcoinNetwork,
+  BitcoinScriptUtils,
   BitcoinTxOutput,
   BitcoinUtxo,
 } from "../../lib/bitcoin"
@@ -58,7 +59,14 @@ export class RedemptionsService {
       bitcoinNetwork
     )
 
-    // TODO: Validate the given script is supported for redemption.
+    if (
+      !BitcoinScriptUtils.isP2PKHScript(redeemerOutputScript) &&
+      !BitcoinScriptUtils.isP2WPKHScript(redeemerOutputScript) &&
+      !BitcoinScriptUtils.isP2SHScript(redeemerOutputScript) &&
+      !BitcoinScriptUtils.isP2WSHScript(redeemerOutputScript)
+    ) {
+      throw new Error("Redeemer output script must be of standard type")
+    }
 
     const { walletPublicKey, mainUtxo } = await this.findWalletForRedemption(
       redeemerOutputScript,