Initial implementation

test/app.test.js

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+import assert from "node:assert/strict";
+import test from "node:test";
+import { createApp } from "../src/app.js";
+import { baseConfig, listen } from "./helpers.js";
+
+const feed = {
+  body: "<rss></rss>",
+  etag: '"feed-tag"',
+  lastModified: new Date("2025-01-01T00:00:00Z"),
+};
+
+test("serves health and RSS endpoints with conditional GET", async (t) => {
+  const app = createApp(baseConfig, {
+    feedService: { async get() { return feed; } },
+    silent: true,
+  });
+  const server = await listen(app);
+  t.after(server.close);
+
+  const health = await fetch(`${server.url}/healthz`);
+  assert.equal(health.status, 200);
+  assert.deepEqual(await health.json(), { status: "ok" });
+
+  const response = await fetch(`${server.url}/rss.xml`);
+  assert.equal(response.status, 200);
+  assert.match(response.headers.get("content-type"), /application\/rss\+xml/);
+  assert.equal(response.headers.get("etag"), feed.etag);
+  assert.equal(await response.text(), feed.body);
+
+  const fresh = await fetch(`${server.url}/rss.xml`, {
+    headers: { "if-none-match": feed.etag },
+  });
+  assert.equal(fresh.status, 304);
+});
+
+test("optionally protects the feed with HTTP Basic auth", async (t) => {
+  const config = structuredClone(baseConfig);
+  config.feed.username = "reader";
+  config.feed.password = "secret:with-colon";
+  const app = createApp(config, {
+    feedService: { async get() { return feed; } },
+    silent: true,
+  });
+  const server = await listen(app);
+  t.after(server.close);
+
+  const denied = await fetch(`${server.url}/rss.xml`);
+  assert.equal(denied.status, 401);
+  assert.match(denied.headers.get("www-authenticate"), /Basic/);
+
+  const accepted = await fetch(`${server.url}/rss.xml`, {
+    headers: {
+      authorization: `Basic ${Buffer.from("reader:secret:with-colon").toString("base64")}`,
+    },
+  });
+  assert.equal(accepted.status, 200);
+});
+
+test("returns 502 without leaking upstream error details", async (t) => {
+  const app = createApp(baseConfig, {
+    feedService: { async get() { throw new Error("secret upstream detail"); } },
+    silent: true,
+  });
+  const server = await listen(app);
+  t.after(server.close);
+
+  const response = await fetch(`${server.url}/rss.xml`);
+  assert.equal(response.status, 502);
+  assert.deepEqual(await response.json(), {
+    error: "Could not generate feed from Suwayomi",
+  });
+});