refactor: return psbt, auto-finalize

packages/snap/snap.manifest.json

@@ -1,13 +1,13 @@
 {
-  "version": "2.0.11",
+  "version": "2.1.0",
   "description": "BOB: Metamask snap to manage your Bitcoin",
   "proposedName": "BOB",
   "repository": {
     "type": "git",
     "url": "https://github.com/bob-collective/bob-snap"
   },
   "source": {
-    "shasum": "Ea+2ea/YTw965c+UA8zhzQIQ8CWIV3yEt5llK6YUjkE=",
+    "shasum": "RxgmYv7eYlRsqDEBd1D8ilbcfoA6zXd0U6qr+qsPEBw=",
     "location": {
       "npm": {
         "filePath": "dist/bundle.js",

packages/snap/src/bitcoin/__tests__/index.test.ts

@@ -106,7 +106,10 @@ changeAddress: tb1qx5wzl3f27d6dgzk9u7h47pqdts60xdpax4w5rf
 
     it('should be able to sign transaction and extract txId and txHex', () => {
       const tx = new BtcPsbt(psbtFixture.base64, BitcoinNetwork.Test);
-      const { txId, txHex } = tx.signPsbt(signer);
+      const psbt = Psbt.fromBase64(tx.signPsbt(signer));
+      expect(psbt.data.inputs[0].finalScriptWitness).toBeDefined();
+      const txId = psbt.extractTransaction().getId();
+      const txHex = psbt.extractTransaction().toHex();
       expect(txId).toBe(
         '4db856b1b7049cce26dc298458796f66d0dee39a5d0651b4c51aa0c66326adec',
       );
@@ -115,6 +118,12 @@ changeAddress: tb1qx5wzl3f27d6dgzk9u7h47pqdts60xdpax4w5rf
       );
     });
 
+    it('should be able to sign transaction without finalizing', () => {
+      const tx = new BtcPsbt(psbtFixture.base64, BitcoinNetwork.Test);
+      const psbt = Psbt.fromBase64(tx.signPsbt(signer, { autoFinalize: false }));
+      expect(psbt.data.inputs[0].finalScriptWitness).toBeUndefined();
+    });
+
     it('should be able to sign taproot transaction and extract txId and txHex', () => {
       bitcoin.initEccLib(ecc);
 
@@ -154,7 +163,9 @@ changeAddress: tb1qx5wzl3f27d6dgzk9u7h47pqdts60xdpax4w5rf
         .toBase64();
 
       const tx = new BtcPsbt(psbtBase64, BitcoinNetwork.Test);
-      const { txId, txHex } = tx.signPsbt(signer);
+      const psbt = Psbt.fromBase64(tx.signPsbt(signer));
+      const txId = psbt.extractTransaction().getId();
+      const txHex = psbt.extractTransaction().toHex();
       expect(txId).toBe(
         'e0a70feca465add48d89fade7c66b68589fc95f21c8e69e3121a4bd6cee3302d',
       );

packages/snap/src/bitcoin/index.ts

@@ -117,18 +117,15 @@ export class BtcPsbt {
         }
     }
 
-    signPsbt(accountSigner: AccountSigner, opts: SignPsbtOptions = {}) {
+    signPsbt(accountSigner: AccountSigner, opts: SignPsbtOptions = { autoFinalize: true }) {
         try {
             const signInputOpts = opts.signInputOpts !== undefined ? opts.signInputOpts : new Array<SignInputOptions>(this.psbt.data.inputs.length).fill({});
             signAllInputsHD(this.psbt, accountSigner, signInputOpts);
-            if (validateSignaturesOfAllInputs(this.psbt, validator, schnorrValidator)) {
+            if (!opts.autoFinalize) {
+                return this.psbt.toBase64();
+            } else if (validateSignaturesOfAllInputs(this.psbt, validator, schnorrValidator)) {
                 this.psbt.finalizeAllInputs();
-                const txId = this.psbt.extractTransaction().getId();
-                const txHex = this.psbt.extractTransaction().toHex();
-                return {
-                    txId,
-                    txHex
-                }
+                return this.psbt.toBase64();
             } else {
                 throw new Error('Signature verification failed');
             }

packages/snap/src/index.ts

@@ -44,7 +44,6 @@ export const onRpcRequest = async ({ origin, request }: RpcRequest) => {
         origin,
         snap,
       );
-    // keep this for backwards compatibility
     case 'btc_signPsbt':
       return signPsbt(
         origin,

packages/snap/src/interface.ts

@@ -12,6 +12,7 @@ export interface GetAllXpubsRequest {
 }
 
 export interface SignPsbtOptions {
+  autoFinalize: boolean,
   signInputOpts?: SignInputOptions[];
 }
 

packages/snap/src/rpc/signPSBT.ts

@@ -9,17 +9,17 @@ import { heading, panel, text, divider } from "@metamask/snaps-ui";
 export async function signPsbt(
   domain: string,
   snap: Snap,
-  psbt: string,
+  psbtBase64: string,
   network: BitcoinNetwork,
   scriptType: ScriptType,
   opts?: SignPsbtOptions
-): Promise<{ txId: string, txHex: string }> {
+): Promise<string> {
   const snapNetwork = await getPersistedData<BitcoinNetwork>(snap, "network", '' as BitcoinNetwork);
   if (snapNetwork != network) {
     throw SnapError.of(RequestErrors.NetworkNotMatch);
   }
 
-  const btcPsbt = new BtcPsbt(psbt, snapNetwork);
+  const btcPsbt = new BtcPsbt(psbtBase64, snapNetwork);
   const txDetails = btcPsbt.extractPsbtJson()
 
   const result = await snap.request({