130 lines
3.5 KiB
JavaScript
130 lines
3.5 KiB
JavaScript
// @ts-check
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const allowedPrefixes = (document.currentScript && document.currentScript.tagName.toUpperCase() === 'SCRIPT' && document.currentScript.dataset.allowedPrefixes) ? document.currentScript.dataset.allowedPrefixes.split(' ') : [];
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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 (document.readyState === 'complete') {
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loaded();
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} else {
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document.addEventListener('readystatechange', function () {
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if (document.readyState === 'complete') {
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loaded();
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}
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});
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}
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};
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/**
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* @param {Map} map
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*/
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var generateId = function (map) {
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var id = 0, failCount = 0, idBuffer = new Uint32Array(1);
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while (id === 0 || map.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 = -(map.size + 1);
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break;
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}
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}
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return id;
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};
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ready(function () {
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/** @type {Map<number, HTMLQuoteElement | HTMLIFrameElement>} */
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var embeds = new Map();
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window.addEventListener('message', function (e) {
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var data = e.data || {};
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if (typeof data !== 'object' || data.type !== 'setHeight' || !embeds.has(data.id)) {
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return;
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}
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var embed = embeds.get(data.id);
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if (embed instanceof HTMLIFrameElement) {
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embed.height = data.height;
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}
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if (embed instanceof HTMLQuoteElement) {
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var iframe = embed.querySelector('iframe');
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if (!iframe || ('source' in e && iframe.contentWindow !== e.source)) {
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return;
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}
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iframe.height = data.height;
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var placeholder = embed.querySelector('a');
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if (!placeholder) return;
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embed.removeChild(placeholder);
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}
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});
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// Legacy embeds
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document.querySelectorAll('iframe.mastodon-embed').forEach(iframe => {
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var id = generateId(embeds);
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embeds.set(id, iframe);
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iframe.allow = 'fullscreen';
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iframe.sandbox = 'allow-scripts allow-same-origin';
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iframe.style.border = 0;
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iframe.style.overflow = 'hidden';
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iframe.style.display = 'block';
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iframe.onload = function () {
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iframe.contentWindow.postMessage({
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type: 'setHeight',
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id: id,
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}, '*');
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};
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iframe.onload(); // In case the script is executing after the iframe has already loaded
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});
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// New generation of embeds
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document.querySelectorAll('blockquote.mastodon-embed').forEach(container => {
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var id = generateId(embeds);
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embeds.set(id, container);
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var iframe = document.createElement('iframe');
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var embedUrl = new URL(container.getAttribute('data-embed-url'));
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if (embedUrl.protocol !== 'https:' && embedUrl.protocol !== 'http:') return;
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if (allowedPrefixes.every((allowedPrefix) => !embedUrl.toString().startsWith(allowedPrefix))) return;
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iframe.src = embedUrl.toString();
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iframe.width = container.clientWidth;
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iframe.height = 0;
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iframe.allow = 'fullscreen';
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iframe.sandbox = 'allow-scripts allow-same-origin';
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iframe.style.border = 0;
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iframe.style.overflow = 'hidden';
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iframe.style.display = 'block';
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iframe.onload = function () {
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iframe.contentWindow.postMessage({
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type: 'setHeight',
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id: id,
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}, '*');
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};
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container.appendChild(iframe);
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});
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});
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})();
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