main.js

const { app, dialog, shell, net, BrowserWindow, Notification } = require('electron');

let win;

// to get rid of "Electron Security Warning (Insecure Content-Security-Policy)" warnings;
// using recommanded <meta http-equiv="Content-Security-Policy"> will cause Matomo to
// fail, among other problems
process.env['ELECTRON_DISABLE_SECURITY_WARNINGS'] = 'true';

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

    // and load the index.html of the app. 
    win.loadFile("./dist/index.html");

    // Hide menu bar.
    win.setMenuBarVisibility(false)

    // Open the DevTools.
    // win.webContents.openDevTools();

    // Ask confirmation before closing the app.
    win.on('close', (e) => {
        e.preventDefault();
        // @WARNING renders ugly on Linux
        const choice = dialog.showMessageBoxSync(
            {
              type: "question",
              buttons: [ "Ok", "Cancel"] , // "OK" and "Cancel" are automatically translated
              defaultId: 1,
              cancelId: 1,
              title: "Exit Cassiopée",
              message: "Are you sure you want to exit Cassiopée ?"
           }
        );
        if(choice == 1){
            e.preventDefault();
        } else {
            win.destroy();
        }
    });

    // Emitted when the window is closed.
    win.on('closed', () => {
        win = null;
    });

    // Try to detect updates
    lookForUpdates();
};

/**
 * Calls the Cassiopee update server to check for available updates;
 * if so, displays a desktop notification which, if clicked, will
 * trigger the download of the latest version installer for the
 * current platform
 * 
 * Web updates system prerequisites
 * --------------------------------
 * 
 * ${URL} should point to an http-accessible directory containing:
 * 
 *  1. a file named "releases.json" with a contents of the form
 *    {
 *      "latest": "4.5.0",
 *      "4.5.0": {
 *        "darwin": "cassiopee-setup-4.5.0.dmg",
 *        "linux": "fr.irstea.cassiopee_4.5.0_amd64.deb",
 *        "win32": "Cassiopée Setup 4.5.0.exe"