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107 lines
4.3 KiB
JavaScript
107 lines
4.3 KiB
JavaScript
// https://github.com/paulirish/lite-youtube-embed/blob/master/src/lite-yt-embed.js
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// import canAutoPlay from 'can-autoplay'
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/**
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* A lightweight youtube embed. Still should feel the same to the user, just MUCH faster to initialize and paint.
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*
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* Thx to these as the inspiration
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* https://storage.googleapis.com/amp-vs-non-amp/youtube-lazy.html
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* https://autoplay-youtube-player.glitch.me/
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*
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* Once built it, I also found these:
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* https://github.com/ampproject/amphtml/blob/master/extensions/amp-youtube (👍👍)
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* https://github.com/Daugilas/lazyYT
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* https://github.com/vb/lazyframe
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*/
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class LiteYTEmbed extends HTMLElement {
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constructor() {
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// Always call super first in constructor
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super()
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// write element functionality in here
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// console.log('canAutoplay', canAutoplay)
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}
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connectedCallback() {
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this.videoId = this.getAttribute('videoid')
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console.log('canAutoplay from connectedCallback', canAutoplay)
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// On hover (or tap), warm up the TCP connections we're (likely) about to use.
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this.addEventListener('pointerover', LiteYTEmbed.warmConnections, {once: true})
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// Once the user clicks, add the real iframe and drop our play button
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// TODO: In the future we could be like amp-youtube and silently swap in the iframe during idle time
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// We'd want to only do this for in-viewport or near-viewport ones: https://github.com/ampproject/amphtml/pull/5003
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this.addEventListener('click', e => this.addIframe())
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}
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// // TODO: Support the the user changing the [videoid] attribute
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// attributeChangedCallback() {
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// }
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/**
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* Add a <link rel={preload | preconnect} ...> to the head
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*/
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static addPrefetch(kind, url, as) {
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const linkEl = document.createElement('link')
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linkEl.rel = kind
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linkEl.href = url
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if (as) {
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linkEl.as = as
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}
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document.head.append(linkEl)
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}
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/**
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* Begin pre-connecting to warm up the iframe load
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* Since the embed's network requests load within its iframe,
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* preload/prefetch'ing them outside the iframe will only cause double-downloads.
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* So, the best we can do is warm up a few connections to origins that are in the critical path.
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*
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* Maybe `<link rel=preload as=document>` would work, but it's unsupported: http://crbug.com/593267
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* But TBH, I don't think it'll happen soon with Site Isolation and split caches adding serious complexity.
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*/
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static warmConnections() {
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if (LiteYTEmbed.preconnected) return
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// The iframe document and most of its subresources come right off youtube.com
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LiteYTEmbed.addPrefetch('preconnect', 'https://www.youtube-nocookie.com')
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// The botguard script is fetched off from google.com
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LiteYTEmbed.addPrefetch('preconnect', 'https://www.google.com')
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// Not certain if these ad related domains are in the critical path. Could verify with domain-specific throttling.
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LiteYTEmbed.addPrefetch('preconnect', 'https://googleads.g.doubleclick.net')
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LiteYTEmbed.addPrefetch('preconnect', 'https://static.doubleclick.net')
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LiteYTEmbed.preconnected = true
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}
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addIframe() {
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const params = new URLSearchParams(this.getAttribute('params') || [])
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params.append('autoplay', '1')
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const iframeEl = document.createElement('iframe')
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iframeEl.width = 560
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iframeEl.height = 315
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// No encoding necessary as [title] is safe. https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html#:~:text=Safe%20HTML%20Attributes%20include
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iframeEl.title = this.playLabel
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iframeEl.allow = 'accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture'
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iframeEl.allowFullscreen = true
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// AFAIK, the encoding here isn't necessary for XSS, but we'll do it only because this is a URL
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// https://stackoverflow.com/q/64959723/89484
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iframeEl.src = `https://www.youtube-nocookie.com/embed/${encodeURIComponent(this.videoId)}?${params.toString()}`
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this.append(iframeEl)
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this.classList.add('lyt-activated')
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// Set focus for a11y
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this.querySelector('iframe').focus()
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}
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}
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// Register custom element
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window.customElements.define('lite-youtube', LiteYTEmbed)
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