feat: suggest app

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@haqq/provider-ledger-react-native",
-  "version": "0.0.6",
+  "version": "0.0.7",
   "description": "Provider for react-native ledger",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/commands/get-app-and-version.ts

@@ -0,0 +1,30 @@
+import TransportBLE from '@ledgerhq/react-native-hw-transport-ble';
+
+export const getAppAndVersion = async (
+  transport: TransportBLE,
+): Promise<{
+  name: string;
+  version: string;
+  flags: number | Buffer;
+}> => {
+  const r = await transport.send(0xb0, 0x01, 0x00, 0x00);
+
+  let i = 0;
+  const format = r[i++];
+
+  if (format !== 1) {
+    throw new Error('getAppAndVersion: format not supported');
+  }
+
+  const nameLength = r[i++];
+  const name = r.slice(i, (i += nameLength)).toString('ascii');
+  const versionLength = r[i++];
+  const version = r.slice(i, (i += versionLength)).toString('ascii');
+  const flagLength = r[i++];
+  const flags = r.slice(i, (i += flagLength));
+  return {
+    name,
+    version,
+    flags,
+  };
+};

src/commands/open-app.ts

@@ -0,0 +1,8 @@
+import TransportBLE from '@ledgerhq/react-native-hw-transport-ble';
+
+export const openApp = async (
+  transport: TransportBLE,
+  name: string,
+): Promise<void> => {
+  await transport.send(0xe0, 0xd8, 0x00, 0x00, Buffer.from(name, 'ascii'));
+};

src/commands/quit-app.ts

@@ -0,0 +1,5 @@
+import TransportBLE from '@ledgerhq/react-native-hw-transport-ble';
+
+export const quitApp = async (transport: TransportBLE) => {
+  await transport.send(0xb0, 0xa7, 0x00, 0x00);
+}

src/commands/suggest-app.ts

@@ -0,0 +1,26 @@
+import TransportBLE from '@ledgerhq/react-native-hw-transport-ble';
+import {getAppAndVersion} from './get-app-and-version';
+import {openApp} from './open-app';
+import {quitApp} from './quit-app';
+
+const dashboardNames = ['BOLOS', 'OLOS\u0000'];
+export const isDashboardName = (name: string) => dashboardNames.includes(name);
+
+export const suggestApp = async (
+  transport: TransportBLE,
+  name: string,
+): Promise<void> => {
+  try {
+    const v = await getAppAndVersion(transport);
+
+    if (v.name !== name) {
+      if (!isDashboardName(v.name)) {
+        await quitApp(transport);
+      }
+
+      await openApp(transport, name);
+    }
+  } catch (e) {
+    console.log('suggestApp', e);
+  }
+};

src/provider.ts

@@ -7,6 +7,7 @@ import {
 import AppEth, {ledgerService} from '@ledgerhq/hw-app-eth';
 import TransportBLE from '@ledgerhq/react-native-hw-transport-ble';
 import {utils, UnsignedTransaction} from 'ethers';
+import {suggestApp} from './commands/suggest-app';
 import {getDeviceConnection} from './get-device-connection';
 import {sleep} from './sleep';
 import {ProviderLedgerReactNativeOptions,} from './types';
@@ -24,6 +25,11 @@ export class ProviderLedgerReactNative extends Provider<ProviderLedgerReactNativ
       if (!transport) {
         throw new Error('can_not_connected');
       }
+
+      if (this._options.appName) {
+        await suggestApp(transport, this._options.appName);
+      }
+
       const eth = new AppEth(transport);
 
       const response = await eth.getAddress(hdPath);
@@ -79,6 +85,10 @@ export class ProviderLedgerReactNative extends Provider<ProviderLedgerReactNativ
         throw new Error('can_not_connected');
       }
 
+      if (this._options.appName) {
+        await suggestApp(transport, this._options.appName);
+      }
+
       const eth = new AppEth(transport);
 
       const signature = await eth.signTransaction(this._options.hdPath, unsignedTx, resolution);
@@ -111,6 +121,10 @@ export class ProviderLedgerReactNative extends Provider<ProviderLedgerReactNativ
         throw new Error('can_not_connected')
       }
 
+      if (this._options.appName) {
+        await suggestApp(transport, this._options.appName);
+      }
+
       const eth = new AppEth(transport);
 
       const signature = await eth.signEIP712HashedMessage(this._options.hdPath, domainHash, valuesHash);
@@ -143,6 +157,11 @@ export class ProviderLedgerReactNative extends Provider<ProviderLedgerReactNativ
       if (!transport) {
         throw new Error('can_not_connected');
       }
+
+      if (this._options.appName) {
+        await suggestApp(transport, this._options.appName);
+      }
+
       const eth = new AppEth(transport);
 
       const response = await eth.getAddress(hdPath, true);

src/types.ts

@@ -37,4 +37,5 @@ export enum State {
 export type ProviderLedgerReactNativeOptions = {
   deviceId: string;
   hdPath: string;
+  appName?: string;
 }