github-ops
76 lines
2.0 KiB
JavaScript
76 lines
2.0 KiB
JavaScript
(function() {
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var manifestPromise = null;
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var loadedScripts = Object.create(null);
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function overlayBasePath() {
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return (window.APP_BASE || '/') + 'overlay/';
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}
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function fetchManifest() {
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return fetch(overlayBasePath() + 'manifest.json', { cache: 'no-store' })
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.then(function(response) {
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if (response.status === 404) {
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return null;
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}
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if (!response.ok) {
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throw new Error('overlay manifest request failed');
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}
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return response.json();
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})
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.catch(function() {
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return null;
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});
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}
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function loadScript(path) {
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if (loadedScripts[path]) {
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return loadedScripts[path];
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}
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loadedScripts[path] = new Promise(function(resolve, reject) {
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var script = document.createElement('script');
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script.src = overlayBasePath() + path.replace(/^\/+/, '');
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script.async = false;
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script.onload = function() { resolve(); };
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script.onerror = function() { reject(new Error('overlay script load failed')); };
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document.head.appendChild(script);
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}).catch(function() {
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return null;
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});
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return loadedScripts[path];
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}
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function load() {
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if (manifestPromise) {
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return manifestPromise;
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}
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manifestPromise = fetchManifest().then(function(manifest) {
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if (!(manifest && manifest.slots && window.CrankUiSlots)) {
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return null;
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}
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var tasks = Object.entries(manifest.slots)
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.filter(function(entry) {
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return window.CrankUiSlots.isAllowed(entry[0]) && typeof entry[1] === 'string';
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})
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.map(function(entry) {
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return loadScript(entry[1]);
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});
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return Promise.all(tasks).then(function() {
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return manifest;
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});
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});
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return manifestPromise;
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}
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async function render(root, context) {
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await load();
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if (window.CrankUiSlots) {
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window.CrankUiSlots.renderAll(root, context);
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}
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}
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window.CrankOverlay = {
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load: load,
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render: render,
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};
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}());
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