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@@ -1,6 +1,11 @@
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+// @ts-check
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+
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(function() {
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'use strict';
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+ /**
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+ * @param {() => void} loaded
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+ */
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var ready = function(loaded) {
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if (['interactive', 'complete'].indexOf(document.readyState) !== -1) {
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loaded();
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@@ -10,25 +15,42 @@
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};
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ready(function() {
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- var iframes = [];
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+ /** @type {Map<number, HTMLIFrameElement>} */
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+ var iframes = new Map();
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window.addEventListener('message', function(e) {
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var data = e.data || {};
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- if (data.type !== 'setHeight' || !iframes[data.id] || window.location.origin !== e.origin || data.id.toString() === '__proto__') {
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+ if (typeof data !== 'object' || data.type !== 'setHeight' || !iframes.has(data.id)) {
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+ return;
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+ }
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+
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+ var iframe = iframes.get(data.id);
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+
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+ if ('source' in e && iframe.contentWindow !== e.source) {
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return;
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}
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- iframes[data.id].height = data.height;
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+ iframe.height = data.height;
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});
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[].forEach.call(document.querySelectorAll('iframe.mastodon-embed'), function(iframe) {
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- iframe.scrolling = 'no';
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- iframe.style.overflow = 'hidden';
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+ // select unique id for each iframe
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+ var id = 0, failCount = 0, idBuffer = new Uint32Array(1);
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+ while (id === 0 || iframes.has(id)) {
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+ id = crypto.getRandomValues(idBuffer)[0];
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+ failCount++;
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+ if (failCount > 100) {
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+ // give up and assign (easily guessable) unique number if getRandomValues is broken or no luck
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+ id = -(iframes.size + 1);
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+ break;
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+ }
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+ }
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- iframes.push(iframe);
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+ iframes.set(id, iframe);
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- var id = iframes.length - 1;
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+ iframe.scrolling = 'no';
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+ iframe.style.overflow = 'hidden';
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iframe.onload = function() {
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iframe.contentWindow.postMessage({
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