Site: show downloads across every release [skip ci]

/release.json adds the sum of every release asset's downloads; the
update manifests are the apps' checks, not downloads.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

site/worker/index.ts

@@ -1,20 +1,51 @@
-// Answers /release.json with the newest release.
-const API = "https://git.zacharyzhang.com/api/v1/repos/ZacharyZhang-NY/ElyOffice/releases/latest";
+// Answers /release.json with the newest release and downloads.
+const REPO = "https://git.zacharyzhang.com/api/v1/repos/ZacharyZhang-NY/ElyOffice";
+const PAGE = 50;
 
 type Cached = RequestInit & { cf: { cacheTtl: number; cacheEverything: boolean } };
+type Asset = { name: string; download_count: number };
+type Release = { tag_name: string; assets: Asset[] };
+
+const init: Cached = {
+  headers: { accept: "application/json", "user-agent": "ely-office-site" },
+  cf: { cacheTtl: 300, cacheEverything: true },
+};
+
+async function read<T>(path: string): Promise<T> {
+  const res = await fetch(`${REPO}${path}`, init);
+  if (!res.ok) throw new Error(`Gitea answered ${res.status} for ${path}`);
+  return (await res.json()) as T;
+}
+
+/** The newest release's version, without the v. */
+async function version(): Promise<string> {
+  const { tag_name: tag } = await read<Release>("/releases/latest");
+  if (!/^v\d+\.\d+\.\d+$/.test(tag)) throw new Error(`Gitea's latest tag is ${JSON.stringify(tag)}`);
+  return tag.slice(1);
+}
+
+/** Downloads of every release; update manifests are checks, not downloads. */
+async function downloads(): Promise<number> {
+  let total = 0;
+  for (let page = 1; ; page++) {
+    const releases = await read<Release[]>(`/releases?limit=${PAGE}&page=${page}`);
+    for (const { assets } of releases) {
+      for (const a of assets) {
+        if (!Number.isInteger(a.download_count)) throw new Error(`${a.name} has no download count`);
+        if (!a.name.endsWith(".json")) total += a.download_count;
+      }
+    }
+    if (releases.length < PAGE) return total;
+  }
+}
 
 export default {
   async fetch(): Promise<Response> {
-    const init: Cached = {
-      headers: { accept: "application/json", "user-agent": "ely-office-site" },
-      cf: { cacheTtl: 300, cacheEverything: true },
-    };
-    const res = await fetch(API, init);
-    if (!res.ok) return new Response(`Gitea answered ${res.status}`, { status: 502 });
-    const { tag_name: tag } = (await res.json()) as { tag_name: unknown };
-    if (typeof tag !== "string" || !/^v\d+\.\d+\.\d+$/.test(tag)) {
-      return new Response(`Gitea's latest tag is ${JSON.stringify(tag)}`, { status: 502 });
+    try {
+      const [v, n] = await Promise.all([version(), downloads()]);
+      return Response.json({ version: v, downloads: n }, { headers: { "cache-control": "public, max-age=300" } });
+    } catch (e) {
+      return new Response(String(e), { status: 502 });
     }
-    return Response.json({ version: tag.slice(1) }, { headers: { "cache-control": "public, max-age=300" } });
   },
 };