Little helper module for building embeddable iframes that work with pym.js and AMP

embed_helper.js

const pym = require('pym.js')

const pymChild = window && window.pymChild ? window.pymChild : new pym.Child()
if ( window && !window.pymChild ) window.pymChild = pymChild

function sendHeight() {
  // Tell pym and AMP to update the height
  pymChild.sendHeight()
  if ( window && window.parent )
    window.parent.postMessage({
      sentinel: 'amp',
      type: 'embed-size',
      height: document.body.scrollHeight
    }, '*')
}

function sendReady() {
  // Tell pym and AMP this embed is ready to be shown
  pymChild.sendMessage('childLoaded', 'ready')
  if ( window && window.parent )
    window.parent.postMessage({
      sentinel: 'amp',
      type: 'embed-ready'
    }, '*')
}

function getParentUrl() {
  const match = window.location.search.match(/parentUrl=(https[^&]+)/)
  if ( match && match.length === 2 ) return decodeURIComponent(match[1])
}

function inAmp() {
  return window.location.hash.match(/amp=1/) || window.location.search.match(/amp=1/)
}

function isIFramed() {
  return window.self !== window.parent
}

module.exports = {
  sendHeight: sendHeight,
  sendReady: sendReady,
  getParentUrl: getParentUrl,
  inAmp: inAmp,
  isIFramed: isIFramed
}