Electron 3 + Facebook login with `webRequest.onBeforeRequest` instead of webContents `"did-get-redirect-request"`

electron-3.0.2-facebook-login.js

  ipcMain.on('facebook-sign-on', function onFacebookSignOn(
    event,
    repromptFacebook,
  ) {
    const options = {
      client_id: FACEBOOK_CLIENT_ID,
      scope: 'public_profile,email',
      redirect_uri: 'https://www.facebook.com/connect/login_success.html',
      auth_type: repromptFacebook ? 'rerequest' : '',
    };

    if (authWindow) {
      authWindow.webContents.focus();
    } else {
      authWindow = new BrowserWindow({
        show: false,
        webPreferences: {
          nodeIntegration: false,
        },
      });
    }

    function handleNavigation(address) {
      const urlParts = url.parse(address);

      if (urlParts.query) {
        const urlParams = qs.parse(urlParts.query);
        if (urlParams.error) {
          const error = urlParams.error_code === '200'
                        ? 'User pressed cancel'
                        : 'Error during auth';

          mainWindow.webContents.executeJavaScript(`store.dispatch({
            type: 'FACEBOOK_TOKEN_ERROR',
            payload: {
              error: '${error}'
            },
          })`);

          authWindow.close();
        }
      }

      if (urlParts.hash) {
        const hashWithoutHashbang = urlParts.hash.slice(1);
        const hashParams = qs.parse(hashWithoutHashbang);
        const accessToken = hashParams.access_token;
        if (accessToken) {
          mainWindow.webContents.executeJavaScript(`store.dispatch({
            type: 'FACEBOOK_TOKEN_RECEIVED',
            token: '${accessToken}',
          })`);

          authWindow.close();
        }
      }
    }

    const facebookAuthURL =
      'https://www.facebook.com/v2.8/dialog/oauth' +
      `?client_id=${options.client_id}&redirect_uri=${options.redirect_uri}` +
      `&response_type=token&scope=${options.scope}&display=popup` +
      (repromptFacebook ? `&auth_type=${options.auth_type}` : '');

    authWindow && authWindow.webContents.on(
      'dom-ready',
      function onAuthReady() {
        authWindow.show();
      }
    );

    authWindow && authWindow.on('closed', function onAuthWindowClose() {
      authWindow = null;
    });

    // user has selected "cancel" in fb dialog
    authWindow && authWindow.webContents.on(
      'will-navigate',
      function onAuthWindowWillNavigate(ev, newUrl) {
        handleNavigation(newUrl);
      }
    );

    // all new windows that facebook dialog might need to open should open
    // in user’s default browser
    authWindow.webContents.on(
      'new-window',
      function onAuthWindowNewWindow(ev, newWindowUrl) {
        ev.preventDefault();
        shell.openExternal(newWindowUrl);
      }
    );

    // user already authenticated
    session.defaultSession.webRequest.onBeforeRequest({
      urls: ['https://www.facebook.com/connect/login_success.html']
    }, function onBeforeRequest(details, callback) {
      handleNavigation(details.url);
      callback({ cancel: true });
    });

    authWindow.loadURL(facebookAuthURL);
  });