keepalive-iframe.html

Enable keyboard shortcuts

<!doctype html>

<html>

<meta charset="utf-8">

<script>

const SEARCH_PARAMS = new URL(location.href).searchParams;

const ORIGIN = SEARCH_PARAMS.get('origin') || '';

const FRAME_ORIGIN = new URL(location.href).origin;

const TOKEN = SEARCH_PARAMS.get('token') || '';

const METHOD = SEARCH_PARAMS.get('method') || 'GET';

const SEND_ON_EVENT = SEARCH_PARAMS.get('sendOn') || 'load';

const MODE = SEARCH_PARAMS.get('mode') || 'cors';

const DISALLOW_CROSS_ORIGIN = SEARCH_PARAMS.get('disallowCrossOrigin') || '';

// CORS requests are allowed by this URL by default.

const url = `${ORIGIN}/fetch/api/resources/stash-put.py?key=${TOKEN}&value=on&mode=${MODE}`

    + `&frame_origin=${FRAME_ORIGIN}` + (DISALLOW_CROSS_ORIGIN ? `&disallow_cross_origin=1` : '');

addEventListener(SEND_ON_EVENT, () => {

  let p = fetch(url, {keepalive: true, method: METHOD, mode: MODE});

  window.parent.postMessage(TOKEN, '*');

});

</script>

</html>