From c8986835efd347ce84c6d52836429c6b9b34644a Mon Sep 17 00:00:00 2001
From: Egge <egge@getcurrent.io>
Date: Wed, 4 Dec 2024 13:47:50 +0100
Subject: [PATCH] use interface isntead of concrete class

---
 src/CashuWallet.ts        | 26 +++++++++++++-------------
 src/model/BlindingData.ts | 11 +++++++++--
 2 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/src/CashuWallet.ts b/src/CashuWallet.ts
index 66cc8578..2939fa15 100644
--- a/src/CashuWallet.ts
+++ b/src/CashuWallet.ts
@@ -32,7 +32,7 @@ import { serializeProof } from '@cashu/crypto/modules/client';
 import { getSignedProofs } from '@cashu/crypto/modules/client/NUT11';
 import { type Proof as NUT11Proof } from '@cashu/crypto/modules/common/index';
 import { SubscriptionCanceller } from './model/types/wallet/websocket.js';
-import { BlindingData } from './model/BlindingData.js';
+import { BlindingData, BlindingDataLike } from './model/BlindingData.js';
 /**
  * The default number of proofs per denomination to keep in a wallet.
  */
@@ -251,7 +251,7 @@ class CashuWallet {
 			pubkey?: string;
 			privkey?: string;
 			requireDleq?: boolean;
-			blindingData?: Array<BlindingData>;
+			blindingData?: Array<BlindingDataLike>;
 		}
 	): Promise<Array<Proof>> {
 		if (typeof token === 'string') {
@@ -307,8 +307,8 @@ class CashuWallet {
 			includeFees?: boolean;
 			includeDleq?: boolean;
 			customBlindingData?: {
-				keep?: Array<BlindingData>;
-				send?: Array<BlindingData>;
+				keep?: Array<BlindingDataLike>;
+				send?: Array<BlindingDataLike>;
 			};
 		}
 	): Promise<SendResponse> {
@@ -489,8 +489,8 @@ class CashuWallet {
 			keysetId?: string;
 			includeFees?: boolean;
 			customBlindingData?: {
-				keep?: Array<BlindingData>;
-				send?: Array<BlindingData>;
+				keep?: Array<BlindingDataLike>;
+				send?: Array<BlindingDataLike>;
 			};
 		}
 	): Promise<SendResponse> {
@@ -788,8 +788,8 @@ class CashuWallet {
 		pubkey?: string,
 		privkey?: string,
 		customBlindingData?: {
-			keep?: Array<BlindingData>;
-			send?: Array<BlindingData>;
+			keep?: Array<BlindingDataLike>;
+			send?: Array<BlindingDataLike>;
 		}
 	): SwapTransaction {
 		const totalAmount = proofsToSend.reduce((total: number, curr: Proof) => total + curr.amount, 0);
@@ -800,8 +800,8 @@ class CashuWallet {
 			);
 		}
 		const keepAmount = totalAmount - amount - this.getFeesForProofs(proofsToSend);
-		let keepBlindingData: Array<BlindingData>;
-		let sendBlindingData: Array<BlindingData>;
+		let keepBlindingData: Array<BlindingDataLike>;
+		let sendBlindingData: Array<BlindingDataLike>;
 
 		if (customBlindingData?.keep) {
 			keepBlindingData = customBlindingData.keep;
@@ -1046,8 +1046,8 @@ class CashuWallet {
 		counter?: number,
 		pubkey?: string,
 		outputAmounts?: Array<number>
-	): Array<BlindingData> {
-		let blindingData: Array<BlindingData>;
+	): Array<BlindingDataLike> {
+		let blindingData: Array<BlindingDataLike>;
 		if (pubkey) {
 			blindingData = BlindingData.createP2PKData(pubkey, amount, keyset, outputAmounts);
 		} else if (counter || counter === 0) {
@@ -1079,7 +1079,7 @@ class CashuWallet {
 		amount: number,
 		keyset: MintKeys,
 		counter?: number
-	): Array<BlindingData> {
+	): Array<BlindingDataLike> {
 		let count = Math.ceil(Math.log2(amount)) || 1;
 		//Prevent count from being -Infinity
 		if (count < 0) {
diff --git a/src/model/BlindingData.ts b/src/model/BlindingData.ts
index 6ea90555..b8415641 100644
--- a/src/model/BlindingData.ts
+++ b/src/model/BlindingData.ts
@@ -1,6 +1,5 @@
 import { createP2PKsecret } from '@cashu/crypto/modules/client/NUT11';
 import {
-	Keys,
 	MintKeys,
 	Proof,
 	SerializedBlindedMessage,
@@ -19,7 +18,15 @@ import { verifyDLEQProof_reblind } from '@cashu/crypto/modules/client/NUT12';
 import { bytesToNumber, numberToHexPadded64, splitAmount } from '../utils';
 import { deriveBlindingFactor, deriveSecret } from '@cashu/crypto/modules/client/NUT09';
 
-export class BlindingData {
+export interface BlindingDataLike {
+	blindedMessage: SerializedBlindedMessage;
+	blindingFactor: bigint;
+	secret: Uint8Array;
+
+	toProof: (signature: SerializedBlindedSignature, keyset: MintKeys) => Proof;
+}
+
+export class BlindingData implements BlindingDataLike {
 	blindedMessage: SerializedBlindedMessage;
 	blindingFactor: bigint;
 	secret: Uint8Array;