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mastodon/public/embed.js

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JavaScript
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// @ts-check
(function () {
'use strict';
/**
* @param {() => void} loaded
*/
var ready = function (loaded) {
if (document.readyState === 'complete') {
loaded();
} else {
document.addEventListener('readystatechange', function () {
if (document.readyState === 'complete') {
loaded();
}
});
}
};
ready(function () {
/** @type {Map<number, HTMLIFrameElement>} */
var iframes = new Map();
window.addEventListener('message', function (e) {
var data = e.data || {};
if (typeof data !== 'object' || data.type !== 'setHeight' || !iframes.has(data.id)) {
return;
}
var iframe = iframes.get(data.id);
if(!iframe) return;
if ('source' in e && iframe.contentWindow !== e.source) {
return;
}
iframe.height = data.height;
});
document.querySelectorAll('iframe.mastodon-embed').forEach(iframe => {
// select unique id for each iframe
var id = 0, failCount = 0, idBuffer = new Uint32Array(1);
while (id === 0 || iframes.has(id)) {
id = crypto.getRandomValues(idBuffer)[0];
failCount++;
if (failCount > 100) {
// give up and assign (easily guessable) unique number if getRandomValues is broken or no luck
id = -(iframes.size + 1);
break;
}
}
iframes.set(id, iframe);
iframe.scrolling = 'no';
iframe.style.overflow = 'hidden';
iframe.onload = function () {
iframe.contentWindow.postMessage({
type: 'setHeight',
id: id,
}, '*');
};
iframe.onload();
});
});
})();