fix(pwa): look up credit packs by own property only

apps/pwa/src/routes/credits.mjs

@@ -17,7 +17,11 @@ export const PACKS = {
 };
 
 creditsRouter.post("/credits/buy", requireAuth, async (req, res) => {
-  const pack = PACKS[req.body.pack] || PACKS.starter;
+  // Own properties only: PACKS is a plain object literal, so a pack name like
+  // `constructor` or `toString` would otherwise resolve to something off
+  // Object.prototype — truthy, so the starter fallback is skipped and the
+  // payment goes out with no amount/credits.
+  const pack = (req.body.pack && Object.hasOwn(PACKS, req.body.pack)) ? PACKS[req.body.pack] : PACKS.starter;
   if (!config.coinpay.businessId) {
     // not wired yet — tell the user instead of failing silently
     return res.redirect("/settings?err=coinpay-not-configured");

apps/pwa/test/credits-pack.test.mjs

@@ -0,0 +1,122 @@
+// Integration test for the credit-pack lookup in POST /credits/buy.
+//
+// PACKS is a plain object literal, so `PACKS[req.body.pack]` resolves names
+// off Object.prototype too: pack=constructor (or toString, hasOwnProperty, …)
+// is truthy, skips the starter fallback, and the CoinPay payment goes out
+// with no amount and no credits.
+//
+// Boots the real router against a throwaway libsql file database plus a stub
+// CoinPay API; skips cleanly when the PWA dependencies are not installed.
+import assert from "node:assert/strict";
+import http from "node:http";
+import fs from "node:fs";
+import { mkdtempSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { createRequire } from "node:module";
+import test from "node:test";
+
+const require = createRequire(import.meta.url);
+let deps = null;
+try {
+  deps = { express: require("express"), cookieParser: require("cookie-parser") };
+} catch {
+  deps = null; // pwa dependencies not installed — tests below skip
+}
+
+const CSRF = "test-csrf-token";
+const SESSION = "test-session-token";
+
+// What the stub CoinPay API last received on /api/payments/create.
+const received = [];
+
+async function boot() {
+  // Stub CoinPay API first: config reads COINPAY_API_BASE once, at import time.
+  const stub = await new Promise((resolve) => {
+    const s = http.createServer((req, res) => {
+      let data = "";
+      req.on("data", (chunk) => { data += chunk; });
+      req.on("end", () => {
+        received.push(JSON.parse(data));
+        res.writeHead(200, { "content-type": "application/json" });
+        res.end(JSON.stringify({ id: "pay_1", hosted_url: "http://coinpay.test/pay/pay_1" }));
+      });
+    });
+    s.listen(0, "127.0.0.1", () => resolve(s));
+  });
+  const stubPort = stub.address().port;
+
+  const workdir = mkdtempSync(path.join(tmpdir(), "moshcode-pwa-test-"));
+  process.env.DATABASE_URL = `file:${path.join(workdir, "test.db")}`;
+  process.env.SESSION_SECRET = "test-secret";
+  process.env.COINPAY_BUSINESS_ID = "biz_test";
+  process.env.COINPAY_API_BASE = `http://127.0.0.1:${stubPort}`;
+
+  const { migrate } = await import("../src/migrate.mjs");
+  await migrate();
+  const { run, db } = await import("../src/db.mjs");
+  const { sessionMiddleware, csrfGuard } = await import("../src/lib/session.mjs");
+  const { creditsRouter } = await import("../src/routes/credits.mjs");
+
+  const app = deps.express();
+  app.use(deps.express.json({ verify: (req, _res, buf) => { req.rawBody = buf.toString("utf8"); } }));
+  app.use(deps.express.urlencoded({ extended: false }));
+  app.use(deps.cookieParser());
+  app.use(sessionMiddleware);
+  app.use(csrfGuard);
+  app.use(creditsRouter);
+  const server = await new Promise((resolve) => {
+    const s = app.listen(0, "127.0.0.1", () => resolve(s));
+  });
+  const base = `http://127.0.0.1:${server.address().port}`;
+  const cookies = `mc_sess=${SESSION}; mc_csrf=${CSRF}`;
+
+  await run(`INSERT INTO users (id, email, display_name, created_at) VALUES ('u1','a@b.c','demo',1)`);
+  await run(`INSERT INTO sessions (token, user_id, created_at, expires_at) VALUES (?,?,?,?)`,
+    [SESSION, "u1", Date.now(), Date.now() + 60_000]);
+
+  const buy = (pack) => fetch(`${base}/credits/buy`, {
+    method: "POST",
+    headers: { cookie: cookies, "content-type": "application/x-www-form-urlencoded" },
+    body: `_csrf=${CSRF}&pack=${encodeURIComponent(pack)}`,
+    redirect: "manual",
+  });
+
+  return { run, db, server, stub, base, cookies, buy, workdir };
+}
+
+let booted = null;
+const app = () => (booted ||= boot());
+
+test.after(() => {
+  if (!booted) return;
+  booted.then(({ server, stub, db, workdir }) => { server.close(); stub.close(); db.close?.(); })
+    .finally(() => { try { fs.rmSync(workdir, { recursive: true, force: true }); } catch { /* noop */ } });
+});
+
+test("credits/buy: a named pack buys that pack", { skip: !deps && "apps/pwa deps not installed" }, async () => {
+  const { buy } = await app();
+  const res = await buy("pro");
+  assert.equal(res.status, 302);
+  const sent = received.at(-1);
+  assert.equal(sent.amount, 20);
+  assert.equal(sent.metadata.credits, 5000);
+});
+
+test("credits/buy: an unknown pack falls back to starter", { skip: !deps && "apps/pwa deps not installed" }, async () => {
+  const { buy } = await app();
+  const res = await buy("bogus");
+  assert.equal(res.status, 302);
+  const sent = received.at(-1);
+  assert.equal(sent.amount, 5);
+  assert.equal(sent.metadata.credits, 1000);
+});
+
+test("credits/buy: an Object.prototype name falls back to starter too", { skip: !deps && "apps/pwa deps not installed" }, async () => {
+  const { buy } = await app();
+  const res = await buy("constructor");
+  assert.equal(res.status, 302);
+  const sent = received.at(-1);
+  assert.equal(sent.amount, 5, "pack=constructor must not reach CoinPay with a missing amount");
+  assert.equal(sent.metadata.credits, 1000);
+});