chore: publish clean community baseline

apps/ui/js/overlay-loader.js

@@ -0,0 +1,75 @@
+(function() {
+  var manifestPromise = null;
+  var loadedScripts = Object.create(null);
+
+  function overlayBasePath() {
+    return (window.APP_BASE || '/') + 'overlay/';
+  }
+
+  function fetchManifest() {
+    return fetch(overlayBasePath() + 'manifest.json', { cache: 'no-store' })
+      .then(function(response) {
+        if (response.status === 404) {
+          return null;
+        }
+        if (!response.ok) {
+          throw new Error('overlay manifest request failed');
+        }
+        return response.json();
+      })
+      .catch(function() {
+        return null;
+      });
+  }
+
+  function loadScript(path) {
+    if (loadedScripts[path]) {
+      return loadedScripts[path];
+    }
+    loadedScripts[path] = new Promise(function(resolve, reject) {
+      var script = document.createElement('script');
+      script.src = overlayBasePath() + path.replace(/^\/+/, '');
+      script.async = false;
+      script.onload = function() { resolve(); };
+      script.onerror = function() { reject(new Error('overlay script load failed')); };
+      document.head.appendChild(script);
+    }).catch(function() {
+      return null;
+    });
+    return loadedScripts[path];
+  }
+
+  function load() {
+    if (manifestPromise) {
+      return manifestPromise;
+    }
+    manifestPromise = fetchManifest().then(function(manifest) {
+      if (!(manifest && manifest.slots && window.CrankUiSlots)) {
+        return null;
+      }
+      var tasks = Object.entries(manifest.slots)
+        .filter(function(entry) {
+          return window.CrankUiSlots.isAllowed(entry[0]) && typeof entry[1] === 'string';
+        })
+        .map(function(entry) {
+          return loadScript(entry[1]);
+        });
+      return Promise.all(tasks).then(function() {
+        return manifest;
+      });
+    });
+    return manifestPromise;
+  }
+
+  async function render(root, context) {
+    await load();
+    if (window.CrankUiSlots) {
+      window.CrankUiSlots.renderAll(root, context);
+    }
+  }
+
+  window.CrankOverlay = {
+    load: load,
+    render: render,
+  };
+}());