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<!DOCTYPE html>
<title>Helper IFrame</title>
<script>
'use strict';
async function onLoad() {
// Load the innermost child iframe and its content.
const params = new URLSearchParams(self.location.search);
const frame = document.createElement('iframe');
frame.src = params.get('target');
document.body.appendChild(frame);
self.addEventListener('message', evt => {
// Pass any operations request messages to the
// innermost child iframe.
if (evt.data.op){
// Ensure that the iframe has loaded before passing
// on the message.
frame.addEventListener('load', function(){
frame.contentWindow.postMessage(evt.data, '*');
});
}
else {
// All other messages, should be sent back to the
// top-level site.
if (self.opener)
self.opener.postMessage(evt.data, '*');
else
self.top.postMessage(evt.data, '*');
}
});
}
self.addEventListener('load', onLoad);
</script>
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