demarches-normaliennes/app/javascript/shared/franceconnect.js

const fconnect = {
  tracesUrl: '/traces',
  aboutUrl: ''
};
const document = window.document;

function init() {
  fconnect.currentHost = 'fcp.integ01.dev-franceconnect.fr';

  if (window.location.hostname == 'www.demarches-simplifiees.fr')
    fconnect.currentHost = 'app.franceconnect.gouv.fr';

  var fconnectProfile = document.getElementById('fconnect-profile');
  if (fconnectProfile) {
    var linkAccess = document.querySelector('#fconnect-profile > a');
    var fcLogoutUrl = fconnectProfile.getAttribute('data-fc-logout-url');
    var access = createFCAccessElement(fcLogoutUrl);
    fconnectProfile.appendChild(access);
    linkAccess.onclick = toggleElement.bind(access);
  }
}

addEventListener('DOMContentLoaded', init);

function toggleElement(event) {
  event.preventDefault();
  if (this.style.display === 'block') {
    this.style.display = 'none';
  } else {
    this.style.display = 'block';
  }
}

function closeFCPopin(event) {
  event.preventDefault();
  fconnect.popin.className = 'fade-out';
  setTimeout(function () {
    document.body.removeChild(fconnect.popin);
  }, 200);
}

function openFCPopin() {
  fconnect.popin = document.createElement('div');
  fconnect.popin.id = 'fc-background';

  var iframe = createFCIframe();

  document.body.appendChild(fconnect.popin);

  fconnect.popin.appendChild(iframe);

  setTimeout(function () {
    fconnect.popin.className = 'fade-in';
  }, 200);
}

function createFCIframe() {
  var iframe = document.createElement('iframe');
  iframe.setAttribute('id', 'fconnect-iframe');
  iframe.frameBorder = 0;
  iframe.name = 'fconnect-iframe';
  return iframe;
}

function createFCAccessElement(logoutUrl) {
  var access = document.createElement('div');
  access.id = 'fconnect-access';
  access.innerHTML = '<h5>Vous êtes identifié grâce à FranceConnect</h5>';
  access.appendChild(createAboutLink());
  access.appendChild(document.createElement('hr'));
  access.appendChild(createHistoryLink());
  access.appendChild(createLogoutElement(logoutUrl));
  return access;
}

function createHistoryLink() {
  var historyLink = document.createElement('a');
  historyLink.target = 'fconnect-iframe';
  historyLink.href = '//' + fconnect.currentHost + fconnect.tracesUrl;
  historyLink.onclick = openFCPopin;
  historyLink.innerHTML = 'Historique des connexions/échanges de données';

  return historyLink;
}

function createAboutLink() {
  var aboutLink = document.createElement('a');
  aboutLink.href = fconnect.aboutUrl
    ? '//' + fconnect.currentHost + fconnect.aboutUrl
    : '#';
  if (fconnect.aboutUrl) {
    aboutLink.target = 'fconnect-iframe';
    aboutLink.onclick = openFCPopin;
  }
  aboutLink.innerHTML = "Qu'est-ce-que FranceConnect ?";

  return aboutLink;
}

function createLogoutElement(logoutUrl) {
  var elm = document.createElement('div');
  elm.className = 'logout';
  elm.innerHTML =
    '<a class="btn btn-default" href="' + logoutUrl + '">Se déconnecter</a>';
  return elm;
}

var eventMethod = window.addEventListener ? 'addEventListener' : 'attachEvent';
var eventer = window[eventMethod];
var messageEvent = eventMethod == 'attachEvent' ? 'onmessage' : 'message';

// Listen to message from child window
eventer(
  messageEvent,
  function (e) {
    var key = e.message ? 'message' : 'data';
    var data = e[key];
    if (data === 'close_popup') {
      closeFCPopin(e);
    }
  },
  false
);