main.js

const { app, BrowserWindow, ipcMain, session } = require('electron');
const fs = require('fs');
const FB = require('fb');
var Env = JSON.parse(fs.readFileSync(`${__dirname}/env.json`));

const path = require('path')
const url = require('url')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

function createWindow() {
	// Create the browser window.
	mainWindow = new BrowserWindow({
		width: 800,
		height: 600
	})

	// and load the index.html of the app.
	mainWindow.loadURL(url.format({
		pathname: path.join(__dirname, 'index.html'),
		protocol: 'file:',
		slashes: true
	}))

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()

	// Emitted when the window is closed.
	mainWindow.on('closed', function () {
		// Dereference the window object, usually you would store windows
		// in an array if your app supports multi windows, this is the time
		// when you should delete the corresponding element.
		mainWindow = null
	})
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', function () {
	// On OS X it is common for applications and their menu bar
	// to stay active until the user quits explicitly with Cmd + Q
	if (process.platform !== 'darwin') {
		app.quit()
	}
})

app.on('activate', function () {
	// On OS X it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (mainWindow === null) {
		createWindow()
	}
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

// Code to create fb authentication window
ipcMain.on('fb-authenticate', function (event, arg) {
	var options = {
		client_id: Env.fb_client_id,
		scopes: 'email',
		redirect_uri: 'https://www.facebook.com/connect/login_success.html'
	};

	var authWindow = new BrowserWindow({
		width: 450,
		height: 300,
		show: false,
		parent: mainWindow,
		modal: true,
		webPreferences: {
			nodeIntegration: false
		}
	});
	var facebookAuthURL = `https://www.facebook.com/v3.2/dialog/oauth?client_id=${options.client_id}&redirect_uri=${options.redirect_uri}&response_type=token,granted_scopes&scope=${options.scopes}&display=popup`;

	authWindow.loadURL(facebookAuthURL);
	authWindow.webContents.on('did-finish-load', function () {
		authWindow.show();
	});

	var access_token, error;
	var closedByUser = true;

	var handleUrl = function (url) {
		var raw_code = /access_token=([^&]*)/.exec(url) || null;
		access_token = (raw_code && raw_code.length > 1) ? raw_code[1] : null;
		error = /\?error=(.+)$/.exec(url);

		if (access_token || error) {
			closedByUser = false;
			FB.setAccessToken(access_token);
			FB.api('/me', {
				fields: ['id', 'name', 'picture.width(800).height(800)']
			}, function (res) {
				mainWindow.webContents.executeJavaScript("document.getElementById(\"fb-name\").innerHTML = \" Name: " + res.name + "\"");
				mainWindow.webContents.executeJavaScript("document.getElementById(\"fb-id\").innerHTML = \" ID: " + res.id + "\"");
				mainWindow.webContents.executeJavaScript("document.getElementById(\"fb-pp\").src = \"" + res.picture.data.url + "\"");
			});
			authWindow.close();
		}
	}

	authWindow.webContents.on('will-navigate', (event, url) => handleUrl(url));
	var filter = {
		urls: [options.redirect_uri + '*']
	};
	session.defaultSession.webRequest.onCompleted(filter, (details) => {
		var url = details.url;
		handleUrl(url);
	});

	authWindow.on('close', () => event.returnValue = closedByUser ? { error: 'The popup window was closed' } : { access_token, error })
})