feat(deeplink): add handleDeeplink on app startup

config/electron.js

@@ -14,6 +14,7 @@ import runDaemon from './daemon/zcashd-child-process';
 import zcashLog from './daemon/logger';
 import getZecPrice from '../services/zec-price';
 import store from './electron-store';
+import { handleDeeplink } from './handle-deeplink';
 
 dotenv.config();
 
@@ -79,6 +80,35 @@ const createWindow = () => {
   exports.mainWindow = mainWindow;
 };
 
+app.setAsDefaultProtocolClient('zcash');
+
+const instanceLock = app.requestSingleInstanceLock();
+if (instanceLock) {
+  app.on('second-instance', (event: Object, argv: string[]) => {
+    handleDeeplink({
+      app,
+      mainWindow,
+      argv,
+      listenOpenUrl: false,
+    });
+
+    if (mainWindow) {
+      if (mainWindow.isMinimized()) {
+        mainWindow.restore();
+      }
+
+      mainWindow.focus();
+    }
+  });
+} else {
+  app.quit();
+}
+
+app.on('will-finish-launching', () => handleDeeplink({
+  app,
+  mainWindow,
+}));
+
 /* eslint-disable-next-line consistent-return */
 app.on('ready', async () => {
   createWindow();

config/handle-deeplink.js

@@ -0,0 +1,36 @@
+// @flow
+import { typeof app as ElectronApp, type electron$BrowserWindow } from 'electron'; // eslint-disable-line
+
+const sendMessage = (mainWindow, url) => {
+  if (mainWindow) {
+    if (mainWindow.isVisible()) {
+      mainWindow.webContents.send('on-deep-link', url);
+    } else {
+      mainWindow.on('show', () => mainWindow.webContents.send('on-deep-link', url));
+    }
+  }
+};
+
+export const handleDeeplink = ({
+  app,
+  mainWindow,
+  argv = process.argv,
+  listenOpenUrl = true,
+}: {
+  app: ElectronApp,
+  mainWindow: electron$BrowserWindow,
+  argv?: string[],
+  listenOpenUrl?: boolean,
+}) => {
+  if (listenOpenUrl) {
+    app.on('open-url', (event: Object, url: string) => {
+      event.preventDefault();
+      sendMessage(mainWindow, url);
+    });
+  }
+
+  if (process.platform === 'win32' || process.platform === 'linux') {
+    const argIndex = argv.findIndex(item => /zcash:(\/\/)?/.test(item));
+    if (argIndex !== -1) sendMessage(mainWindow, argv[argIndex]);
+  }
+};