143 lines
7.8 KiB
JavaScript
143 lines
7.8 KiB
JavaScript
/* Build-local classic-script loader. The inert manifest precedes this head script. */
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(function (root) {
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'use strict';
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const doc = root.document;
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let manifest;
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try { manifest = JSON.parse(doc.getElementById('ytp-assets').textContent); }
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catch { return; } // The index must supply this map; never fetch one during boot.
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const assets = new Map(), groups = new Map(), hooks = new Map();
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const css = new Set([...doc.querySelectorAll('link[data-lazy-css]')].map(link => link.dataset.lazyCss));
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const selected = new Map();
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const url = path => selected.get(path) || (manifest.files[path]?.h ? path + '?v=' + manifest.files[path].h : './' + path.replace(/^\//,''));
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function reloadRequired(name) {
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api.reloadRequired = true;
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if (root.CustomEvent) root.dispatchEvent?.(new root.CustomEvent('ytp-reload-required', { detail: { group: name } }));
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}
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function compatible(name, current, seen = new Set()) {
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if(seen.has(name))return true;
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seen.add(name);
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const built=manifest.groups[name], newer=current.groups[name];
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if(!built || !newer || built.contract!==newer.contract)return false;
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return (newer.dependencies || []).every(dependency=>(built.dependencies || []).includes(dependency)&&compatible(dependency,current,seen));
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}
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async function select(name) {
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if (!root.caches) return;
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try {
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const cache = await root.caches.open('ytplayer-assets');
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const response = await cache.match('/__ytp_asset_state');
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const current = response && (await response.json()).current;
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const built = manifest.groups[name], newer = current?.groups[name];
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// The active layout's CSS already executed in the parser before app boot.
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if(name === 'layout:'+api.layout) return;
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if (!newer || current.buildTag === manifest.buildTag) return;
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if (!compatible(name,current)) { reloadRequired(name); return; }
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const changedList = newer.files.join('\n') !== built.files.join('\n');
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const available = new Map();
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for (const path of changedList ? newer.files : built.files) {
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// Membership and contract must both match the running core's expectation.
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if (!newer.files.includes(path) || !current.files[path]) continue;
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const key = path + '?v=' + current.files[path].h;
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const held = await cache.match(key);
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if (held?.headers.get('X-Asset-Hash') === current.files[path].h) available.set(path, key);
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}
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if(changedList && available.size !== newer.files.length)return;
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for(const [path,key] of available)selected.set(path,key);
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if(changedList)return newer;
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} catch { /* Private browsing/cache eviction: keep the embedded build-local map. */ }
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}
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function inject(path) {
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if (assets.has(path)) return assets.get(path);
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const style = /\.css$/.test(path);
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if (style && css.has(path)) return Promise.resolve();
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if (!style && !/\.js$/.test(path)) return Promise.resolve(); // workers/imports/fonts are not page scripts
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const task = new Promise((resolve, reject) => {
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const node = doc.createElement(style ? 'link' : 'script');
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if (style) { node.rel = 'stylesheet'; node.href = url(path); }
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else { node.async = false; node.src = url(path); }
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node.onload = resolve;
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node.onerror = () => reject(new Error('Unable to load ' + path));
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doc.head.append(node);
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});
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assets.set(path, task);
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task.catch(() => assets.delete(path));
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return task;
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}
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function load(name) {
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if (groups.has(name)) return groups.get(name);
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const group = manifest.groups[name];
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if (!group) return Promise.reject(new Error('Unknown asset group: ' + name));
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const task = (async () => {
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for (const dependency of group.dependencies || []) await load(dependency);
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const selectedGroup = await select(name) || group;
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for (const path of selectedGroup.files) if (!/-worker\.js$/.test(path)) await inject(path);
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for (const fn of hooks.get(name) || []) await fn();
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group.executed = true;
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})();
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groups.set(name, task);
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task.catch(error => {
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groups.delete(name);
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if (root.CustomEvent) root.dispatchEvent?.(new root.CustomEvent('ytp-lazy-error', { detail: { group: name, error } }));
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});
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return task;
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}
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const api = {
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load, prefetch: load, loaded: name => !!manifest.groups[name]?.executed, url,
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manifest, layout: 'classic', reloadRequired: false,
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worker(path) {
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const worker=new root.Worker(url(path)), post=worker.postMessage.bind(worker); let first=true;
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worker.postMessage=(message,transfer)=>{
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if(first) { first=false; message={...message,assetUrls:{sha256:url('/sha256.js'),wasm:url('/sha256-wasm.js'),resume:url('/resume-core.js')}}; }
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post(message,transfer);
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};
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return worker;
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},
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reportLayout(registration) {
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const send = reg => {
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const workers = new Set([root.navigator.serviceWorker.controller, reg?.installing, reg?.waiting, reg?.active]);
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for(const worker of workers) worker?.postMessage({type:'LAYOUT',value:api.layout});
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};
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if(registration)send(registration);
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else root.navigator.serviceWorker?.getRegistration().then(send).catch(()=>{});
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},
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warm() {
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if(root.navigator.connection?.saveData || !root.navigator.serviceWorker) return;
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const idle = root.requestIdleCallback || (fn => root.setTimeout(fn,1000));
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idle(()=>root.navigator.serviceWorker.ready.then(reg=>reg.active?.postMessage({type:'WARM_ASSETS',saveData:!!root.navigator.connection?.saveData})).catch(()=>{}));
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},
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onLoad(name, fn) {
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if(api.loaded(name)) { Promise.resolve().then(fn).catch(error=>{if(root.CustomEvent)root.dispatchEvent?.(new root.CustomEvent('ytp-lazy-error',{detail:{group:name,error}}));}); return; }
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const list = hooks.get(name) || []; list.push(fn); hooks.set(name, list);
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},
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proxy(name, methods, globalName) {
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return Object.fromEntries(methods.map(method => [method, async (...args) => {
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await load(name);
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const target = root[globalName || name.split(':')[1]];
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if (typeof target?.[method] !== 'function') throw new Error('Missing lazy method: ' + method);
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return target[method](...args);
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}]));
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},
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intent(element, name) {
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if (!element) return;
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for (const type of ['pointerenter', 'focus', 'touchstart']) element.addEventListener(type, () => load(name).catch(() => {}), { once: true, passive: true });
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},
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};
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root.Lazy = api;
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root.navigator.serviceWorker?.addEventListener('message',event=>{
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if(event.data?.type==='ASSET_LAYOUT_REQUEST') event.source?.postMessage({type:'LAYOUT',value:api.layout});
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if(event.data?.type==='SW_UPDATE_AVAILABLE') api.warm();
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});
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root.navigator.serviceWorker?.addEventListener('controllerchange',()=>{api.reportLayout();api.warm();});
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let settings={};
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try { settings=JSON.parse(root.localStorage.getItem('_ytpdata') || '{}').settings || {}; api.layout=settings.layout || 'classic'; } catch {}
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Object.assign(doc.documentElement.dataset,{layout:api.layout,theme:settings.theme || 'dark',font:settings.fontScale || 'normal',density:settings.density || 'comfortable',perf:settings.perfMode?'on':'off',motion:settings.reduceMotion?'reduced':'full'});
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const layoutName = manifest.groups['layout:' + api.layout] ? 'layout:'+api.layout : 'layout:classic';
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const layoutGroups = new Set([layoutName]);
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for(const name of layoutGroups) for(const dependency of manifest.groups[name]?.dependencies || []) layoutGroups.add(dependency);
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if (doc.readyState === 'loading') for (const path of [...layoutGroups].flatMap(name=>manifest.groups[name]?.files || [])) {
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if (!/\.css$/.test(path) || css.has(path)) continue;
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// Parser-inserted CSS blocks rendering; dynamic head links do not on all WebKit versions.
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css.add(path);
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doc.write('<link rel="stylesheet" href="' + url(path) + '" data-lazy-css="' + path + '">');
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}
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})(typeof window !== 'undefined' ? window : globalThis);
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