electron-win-url

main.js

//chat://function/?param=bar

const { app, BrowserWindow } = require('electron');
const path = require('path');
const url = require('url');

let mainWindow = null;

let yourURL;

// Force Single Instance Application
const shouldQuit = app.makeSingleInstance((argv, workingDirectory) => {
  // Protocol handler for win
  if (process.platform == 'win32') {
    yourURL = argv.slice(1);
  }
  logEverywhere(yourURL);

  if (win) {
    if (win.isMinimized()) win.restore();
    win.focus();
  }
});

if (shouldQuit) {
  app.quit();
  return;
}

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600
  });

  mainWindow.loadURL(
    url.format({
      pathname: path.join(__dirname, 'index.html'),
      protocol: 'file:',
      slashes: true
    })
  );

  mainWindow.webContents.openDevTools();

  // Protocol handler for win
  if (process.platform == 'win32') {
    yourURL = process.argv.slice(1);
  }
  logEverywhere(yourURL);

  handleURL(yourURL);

  mainWindow.on('closed', function() {
    mainWindow = null;
  });
}

app.on('ready', createWindow);

app.on('window-all-closed', function() {
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', function() {
  if (mainWindow === null) {
    createWindow();
  }
});

app.setAsDefaultProtocolClient('chat');

// Protocol handler for osx
app.on('open-url', function(ev, url) {
  ev.preventDefault();
  yourURL = url;
  logEverywhere(yourURL);
});

function handleURL(url) {
  if (win && win.webContents) {
    win.webContents.executeJavaScript(handleIntent(`${url}`));
  }
  if (url.indexOf('messagenius_dev') != -1) {
    win.webContents.openDevTools();
  }
  if (url.indexOf('messagenius_fullscreen') != -1) {
    win.setFullScreen(true);
  }
}

function logEverywhere(s) {
  console.log(s);
  if (mainWindow && mainWindow.webContents) {
    mainWindow.webContents.executeJavaScript(`console.log("${s}")`);
  }
}