feat(hub): shared nav shell, downloads UI, footer fix

Signed-off-by: Anton Afanasyeu <a.afanasieff@gmail.com>

assets/hub-downloads.js

@@ -1,6 +1,9 @@
 (function () {
   'use strict';
 
+  /** Orchestration default channel; stable is fallback for promoted releases. */
+  var OTA_CHANNELS = ['staging', 'stable'];
+
   function setStatus(msg) {
     var el = document.getElementById('hub-download-apk-status');
     if (el) {
@@ -8,32 +11,79 @@
     }
   }
 
-  function resolveStableApkUrl() {
-    return fetch('/v0/ota/channel/stable.json', { cache: 'no-store' })
-      .then(function (r) {
-        if (!r.ok) {
-          throw new Error('stable channel HTTP ' + r.status);
-        }
-        return r.json();
-      })
+  function fetchJson(url) {
+    return fetch(url, { cache: 'no-store' }).then(function (r) {
+      if (!r.ok) {
+        throw new Error('HTTP ' + r.status + ' for ' + url);
+      }
+      return r.json();
+    });
+  }
+
+  function resolveApkFromChannel(channelName) {
+    return fetchJson('/v0/ota/channel/' + encodeURIComponent(channelName) + '.json')
       .then(function (channel) {
         var manifestUrl = channel && channel.manifestUrl;
         if (!manifestUrl) {
-          throw new Error('stable.json missing manifestUrl');
+          throw new Error(channelName + ' missing manifestUrl');
         }
-        return fetch(manifestUrl, { cache: 'no-store' }).then(function (r) {
-          if (!r.ok) {
-            throw new Error('manifest HTTP ' + r.status);
-          }
-          return r.json();
-        });
+        return fetchJson(manifestUrl);
       })
       .then(function (manifest) {
-        var url = manifest && (manifest.apkUrl || manifest.bundleUrl);
+        var url =
+          (manifest && (manifest.browserApkUrl || manifest.apkUrl)) || '';
         if (!url) {
-          throw new Error('manifest missing apkUrl');
+          throw new Error('manifest missing browserApkUrl/apkUrl');
         }
-        return url;
+        if (!manifest.browserApkUrl && /\.otapkg(\?|$)/.test(url)) {
+          url = url.replace(/\.otapkg(\?|$)/, '.apk$1');
+        }
+        var nameMatch = url.match(/\/([^/?#]+\.apk)(?:\?|$)/i);
+        var filename = nameMatch ? nameMatch[1] : 'android_cast-latest.apk';
+        return { url: url, filename: filename, channel: channelName };
+      });
+  }
+
+  function resolveApkUrl() {
+    var chain = Promise.reject(new Error('no channel'));
+    OTA_CHANNELS.forEach(function (ch) {
+      chain = chain.catch(function () {
+        return resolveApkFromChannel(ch);
+      });
+    });
+    return chain;
+  }
+
+  function triggerDownload(url, filename) {
+    if (/\.apk(\?|$)/i.test(url)) {
+      var a = document.createElement('a');
+      a.href = url;
+      a.download = filename;
+      a.rel = 'noopener';
+      document.body.appendChild(a);
+      a.click();
+      a.remove();
+      return Promise.resolve();
+    }
+    return fetch(url, { cache: 'no-store' })
+      .then(function (r) {
+        if (!r.ok) {
+          throw new Error('download HTTP ' + r.status);
+        }
+        return r.blob();
+      })
+      .then(function (blob) {
+        var blobUrl = URL.createObjectURL(blob);
+        var link = document.createElement('a');
+        link.href = blobUrl;
+        link.download = filename;
+        link.rel = 'noopener';
+        document.body.appendChild(link);
+        link.click();
+        link.remove();
+        setTimeout(function () {
+          URL.revokeObjectURL(blobUrl);
+        }, 60000);
       });
   }
 
@@ -44,14 +94,17 @@
     }
     btn.addEventListener('click', function () {
       btn.disabled = true;
-      setStatus('Resolving stable OTA channel…');
-      resolveStableApkUrl()
-        .then(function (url) {
-          setStatus('Downloading…');
-          window.location.href = url;
+      setStatus('Resolving OTA channel…');
+      resolveApkUrl()
+        .then(function (resolved) {
+          setStatus('Downloading ' + resolved.filename + ' (' + resolved.channel + ')…');
+          return triggerDownload(resolved.url, resolved.filename);
         })
         .catch(function (err) {
-          setStatus('APK unavailable — run builder OTA publish (stable). ' + (err.message || err));
+          setStatus(
+            'APK unavailable — run builder with OTA publish (staging). ' +
+              (err.message || err)
+          );
         })
         .finally(function () {
           btn.disabled = false;