From 37fd1fb76dd9a01151a3877afcc7b5c2409e70d4 Mon Sep 17 00:00:00 2001
From: Antoni Spaanderman <56turtle56@gmail.com>
Date: Sun, 24 Jul 2022 18:44:27 +0200
Subject: [PATCH] move parseMultisigScript to bitcoin.util.ts

---
 frontend/src/app/bitcoin.utils.ts             | 40 ++++++++++++++++++-
 .../address-labels.component.ts               | 39 +-----------------
 2 files changed, 40 insertions(+), 39 deletions(-)

diff --git a/frontend/src/app/bitcoin.utils.ts b/frontend/src/app/bitcoin.utils.ts
index e5cdde87f..d1f0d6553 100644
--- a/frontend/src/app/bitcoin.utils.ts
+++ b/frontend/src/app/bitcoin.utils.ts
@@ -1,5 +1,4 @@
 import { Transaction, Vin } from './interfaces/electrs.interface';
-import { parseMultisigScript } from './components/address-labels/address-labels.component';
 
 const P2SH_P2WPKH_COST = 21 * 4; // the WU cost for the non-witness part of P2SH-P2WPKH
 const P2SH_P2WSH_COST  = 35 * 4; // the WU cost for the non-witness part of P2SH-P2WSH
@@ -114,6 +113,45 @@ export function calcSegwitFeeGains(tx: Transaction) {
   };
 }
 
+/** extracts m and n from a multisig script (asm), returns nothing if it is not a multisig script */
+export function parseMultisigScript(script: string): void | { m: number, n: number } {
+  if (!script) {
+    return;
+  }
+  const ops = script.split(' ');
+  if (ops.length < 3 || ops.pop() !== 'OP_CHECKMULTISIG') {
+    return;
+  }
+  const opN = ops.pop();
+  if (!opN.startsWith('OP_PUSHNUM_')) {
+    return;
+  }
+  const n = parseInt(opN.match(/[0-9]+/)[0], 10);
+  if (ops.length < n * 2 + 1) {
+    return;
+  }
+  // pop n public keys
+  for (let i = 0; i < n; i++) {
+    if (!/^0((2|3)\w{64}|4\w{128})$/.test(ops.pop())) {
+      return;
+    }
+    if (!/^OP_PUSHBYTES_(33|65)$/.test(ops.pop())) {
+      return;
+    }
+  }
+  const opM = ops.pop();
+  if (!opM.startsWith('OP_PUSHNUM_')) {
+    return;
+  }
+  const m = parseInt(opM.match(/[0-9]+/)[0], 10);
+
+  if (ops.length) {
+    return;
+  }
+
+  return { m, n };
+}
+
 // https://github.com/shesek/move-decimal-point
 export function moveDec(num: number, n: number) {
   let frac, int, neg, ref;
diff --git a/frontend/src/app/components/address-labels/address-labels.component.ts b/frontend/src/app/components/address-labels/address-labels.component.ts
index 6dc10f6e9..331114ff4 100644
--- a/frontend/src/app/components/address-labels/address-labels.component.ts
+++ b/frontend/src/app/components/address-labels/address-labels.component.ts
@@ -1,6 +1,7 @@
 import { Component, ChangeDetectionStrategy, Input, OnChanges } from '@angular/core';
 import { Vin, Vout } from '../../interfaces/electrs.interface';
 import { StateService } from 'src/app/services/state.service';
+import { parseMultisigScript } from 'src/app/bitcoin.utils';
 
 @Component({
   selector: 'app-address-labels',
@@ -109,41 +110,3 @@ export class AddressLabelsComponent implements OnChanges {
     this.detectMultisig(this.vout.scriptpubkey_asm);
   }
 }
-
-export function parseMultisigScript(script: string): void | { m: number, n: number } {
-  if (!script) {
-    return;
-  }
-  const ops = script.split(' ');
-  if (ops.length < 3 || ops.pop() !== 'OP_CHECKMULTISIG') {
-    return;
-  }
-  const opN = ops.pop();
-  if (!opN.startsWith('OP_PUSHNUM_')) {
-    return;
-  }
-  const n = parseInt(opN.match(/[0-9]+/)[0], 10);
-  if (ops.length < n * 2 + 1) {
-    return;
-  }
-  // pop n public keys
-  for (let i = 0; i < n; i++) {
-    if (!/^0((2|3)\w{64}|4\w{128})$/.test(ops.pop())) {
-      return;
-    }
-    if (!/^OP_PUSHBYTES_(33|65)$/.test(ops.pop())) {
-      return;
-    }
-  }
-  const opM = ops.pop();
-  if (!opM.startsWith('OP_PUSHNUM_')) {
-    return;
-  }
-  const m = parseInt(opM.match(/[0-9]+/)[0], 10);
-
-  if (ops.length) {
-    return;
-  }
-
-  return { m, n };
-}