add Touch ID wallet unlock via Swift biometric helper + Bun spawn

apps/desktop/src/bun/index.ts

@@ -27,6 +27,7 @@ import {
 	getBinaryDir,
 	MoneroWalletManager,
 } from './lib/monero'
+import { canPromptTouchID, promptTouchID } from './lib/biometric'
 
 const env = getENV()
 
@@ -133,6 +134,14 @@ type TxEntry = {
 type RPC = {
 	bun: RPCSchema<{
 		requests: {
+			biometricCanAuth: {
+				params: {}
+				response: boolean
+			}
+			biometricAuth: {
+				params: { reason: string }
+				response: boolean
+			}
 			getSecret: {
 				params: {
 					service: string
@@ -357,6 +366,20 @@ const rpc = BrowserView.defineRPC<RPC>({
 	maxRequestTime: 120000,
 	handlers: {
 		requests: {
+			biometricCanAuth: async () => {
+				try {
+					return canPromptTouchID()
+				} catch {
+					return false
+				}
+			},
+			biometricAuth: async ({ reason }) => {
+				try {
+					return promptTouchID(reason)
+				} catch {
+					return false
+				}
+			},
 			getSecret: async ({ name, service }) => {
 				return await Bun.secrets.get({ name, service })
 			},

apps/desktop/src/bun/lib/biometric.ts

@@ -0,0 +1,31 @@
+import { existsSync } from 'fs'
+import { join } from 'path'
+import { fileURLToPath } from 'url'
+import { PATHS } from 'electrobun/bun'
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url))
+
+function findHelper(): string {
+	const candidates = [
+		join(__dirname, '..', 'native', 'biometric-helper'),
+		join(PATHS.RESOURCES_FOLDER, 'native', 'biometric-helper'),
+	]
+	for (const p of candidates) {
+		if (existsSync(p)) return p
+	}
+	throw new Error(
+		`biometric-helper not found at any of:\n${candidates.join('\n')}`,
+	)
+}
+
+const HELPER_PATH = findHelper()
+
+export function canPromptTouchID(): boolean {
+	const result = Bun.spawnSync([HELPER_PATH, '--check'])
+	return result.exitCode === 0
+}
+
+export function promptTouchID(reason: string): boolean {
+	const result = Bun.spawnSync([HELPER_PATH, reason])
+	return result.exitCode === 0
+}

apps/desktop/src/bun/native/biometric-helper.swift

@@ -0,0 +1,32 @@
+import Foundation
+import LocalAuthentication
+
+let context = LAContext()
+var error: NSError?
+let available = context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error)
+
+let isCheck = CommandLine.arguments.contains("--check")
+if isCheck {
+    print(available)
+    exit(available ? 0 : 1)
+}
+
+guard available else {
+    print(error!.localizedDescription)
+    exit(1)
+}
+
+let reason = CommandLine.arguments.last ?? "Authenticate"
+let sem = DispatchSemaphore(value: 0)
+
+context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason) { success, authError in
+    if success {
+        exit(0)
+    }
+    if let err = authError {
+        print(err.localizedDescription)
+    }
+    exit(1)
+}
+
+_ = sem.wait(timeout: .distantFuture)

apps/desktop/src/lib/components/EvmDashboard.svelte

@@ -14,6 +14,7 @@
 	import ArrowDown from '@lucide/svelte/icons/arrow-down'
 	import ArrowUp from '@lucide/svelte/icons/arrow-up'
 	import QrCodeIcon from '@lucide/svelte/icons/qr-code'
+	import Fingerprint from '@lucide/svelte/icons/fingerprint'
 	import * as Dialog from '$lib/components/ui/dialog/index.js'
 	import QRCode from 'qrcode'
 
@@ -101,8 +102,26 @@
 	</Card>
 {:else if w.isLocked}
 	<Card>
+		<CardHeader>
+			<CardTitle>Wallet Locked</CardTitle>
+			<CardDescription>Your seed is stored in the system keychain</CardDescription>
+		</CardHeader>
 		<CardContent>
-			<p class="text-muted-foreground text-xs">Unlocking...</p>
+			{#if w.biometricAvailable}
+				<Button
+					onclick={() => w.unlockWithBiometrics()}
+					disabled={w.loading}>
+					<Fingerprint size={16} />
+					{w.loading ? 'Unlocking...' : 'Unlock with Touch ID'}
+				</Button>
+			{:else}
+				<p class="text-muted-foreground text-xs">
+					Touch ID not available on this device
+				</p>
+			{/if}
+			{#if w.error}
+				<p class="mt-3 text-red-500">{w.error}</p>
+			{/if}
 		</CardContent>
 	</Card>
 {:else}

apps/desktop/src/lib/electrobun.ts

@@ -92,6 +92,14 @@ export type TokenBalanceResult = {
 type RPC = {
 	bun: {
 		requests: {
+			biometricCanAuth: {
+				params: {}
+				response: boolean
+			}
+			biometricAuth: {
+				params: { reason: string }
+				response: boolean
+			}
 			getSecret: {
 				params: {
 					service: string

apps/desktop/src/lib/states/wallet.svelte.ts

@@ -77,6 +77,7 @@ export const Wallet = () => {
 	let moneroTxs = $state<MoneroTxEntry[]>([])
 	let moneroInstalled = $state(false)
 	let moneroDownloading = $state(false)
+	let biometricAvailable = $state(false)
 	let moneroWalletName = $state('')
 	let moneroAccounts = $state<MoneroAccountEntry[]>([])
 	let moneroWallets = $state<string[]>([])
@@ -115,6 +116,7 @@ export const Wallet = () => {
 			seed = raw
 			await refresh()
 		}
+		await checkBiometric()
 		try {
 		} catch (e) {
 			console.log(e)
@@ -159,6 +161,32 @@ export const Wallet = () => {
 		}
 	}
 
+	const checkBiometric = async () => {
+		if (!electrobun.rpc) return
+		const [ok] = await tryCatch(
+			electrobun.rpc.request.biometricCanAuth({}),
+		)
+		biometricAvailable = ok === true
+	}
+
+	const unlockWithBiometrics = async () => {
+		if (!electrobun.rpc) return false
+		const [authed] = await tryCatch(
+			electrobun.rpc.request.biometricAuth({ reason: 'Unlock wallet' }),
+		)
+		if (!authed) return false
+		const [raw] = await tryCatch(
+			electrobun.rpc.request.getSecret({
+				service: 'koins',
+				name: 'vault',
+			}),
+		)
+		if (!raw) return false
+		seed = raw
+		await refresh()
+		return true
+	}
+
 	const lock = () => {
 		seed = ''
 		address = ''
@@ -399,9 +427,11 @@ export const Wallet = () => {
 		get moneroWalletName() { return moneroWalletName },
 		get moneroAccounts() { return moneroAccounts },
 		get moneroWallets() { return moneroWallets },
+		get biometricAvailable() { return biometricAvailable },
 		refresh,
 		init,
 		lock,
+		unlockWithBiometrics,
 		saveVault,
 		switchNetwork,
 		saveApiKey,