VibeFinance/backend/src/server.js

import express from "express";
import cors from "cors";
import helmet from "helmet";
import rateLimit from "express-rate-limit";
import cookieParser from "cookie-parser";
import pinoHttp from "pino-http";
import { existsSync } from "fs";
import { join } from "path";
import { config } from "./config/index.js";
import { logger } from "./logger.js";
import { initDb } from "./db.js";
import authRouter   from "./routes/auth.js";
import dataRouter   from "./routes/data.js";
import usersRouter  from "./routes/users.js";
import healthRouter from "./routes/health.js";
import updateRouter from "./routes/update.js";
import { errorHandler } from "./middleware/errorHandler.js";

export { logger };

const app = express();

// ── Security ──────────────────────────────────────────────────────────────────
// De app serveert nu ook de frontend, dus het CSP-beleid moet passen bij wat
// die pagina laadt: Google Fonts, inline <style> van React en base64-avatars.
app.use(helmet({
  contentSecurityPolicy: {
    directives: {
      defaultSrc:  ["'self'"],
      scriptSrc:   ["'self'"],
      styleSrc:    ["'self'", "'unsafe-inline'", "https://fonts.googleapis.com"],
      fontSrc:     ["'self'", "https://fonts.gstatic.com", "data:"],
      imgSrc:      ["'self'", "data:", "blob:"],
      connectSrc:  ["'self'"],
      objectSrc:   ["'none'"],
      baseUri:     ["'self'"],
      formAction:  ["'self'"],
      // Uit: intern draait de app op http achter een reverse proxy.
      upgradeInsecureRequests: null,
    },
  },
}));
app.use(cors({ origin: config.CORS_ORIGIN, credentials: true }));
app.set("trust proxy", 1);

// ── Rate limiting (alleen op de API — niet op statische bestanden) ────────────
app.use("/api/auth", rateLimit({ windowMs: 15 * 60 * 1000, max: 20, standardHeaders: true, legacyHeaders: false }));
app.use("/api",      rateLimit({ windowMs: 15 * 60 * 1000, max: 200, standardHeaders: true, legacyHeaders: false }));

// ── Parsing ───────────────────────────────────────────────────────────────────
app.use(express.json({ limit: "2mb" }));
app.use(cookieParser());

// ── Logging ───────────────────────────────────────────────────────────────────
if (config.NODE_ENV !== "test") {
  app.use(pinoHttp({ logger }));
}

// ── API-routes ────────────────────────────────────────────────────────────────
app.use("/api/health",       healthRouter);
app.use("/api/update-check", updateRouter);
app.use("/api/auth",         authRouter);
app.use("/api/data",         dataRouter);
app.use("/api/users",        usersRouter);

// ── 404 voor overige /api/* ───────────────────────────────────────────────────
// Zonder pad-patroon met wildcard: Express 5 vereist benoemde wildcards
// (/api/*splat), en een prefix-mount doet hier precies hetzelfde.
app.use("/api", (_req, res) => res.status(404).json({ error: "Endpoint niet gevonden." }));

// ── Frontend (Vite build) ─────────────────────────────────────────────────────
const indexHtml = join(config.STATIC_DIR, "index.html");
export const servesFrontend = existsSync(indexHtml);

if (servesFrontend) {
  // Assets hebben een hash in de naam en mogen lang gecached worden;
  // index.html juist nooit, anders blijft een oude build hangen.
  app.use(express.static(config.STATIC_DIR, {
    index: false,
    setHeaders(res, path) {
      res.setHeader("Cache-Control", path.endsWith(".html")
        ? "no-store, no-cache, must-revalidate"
        : "public, max-age=31536000, immutable");
    },
  }));

  // SPA-fallback: alle overige GET-routes naar index.html. Pathloze middleware
  // in plaats van app.get("*") — dat patroon is in Express 5 ongeldig.
  app.use((req, res, next) => {
    if (req.method !== "GET" && req.method !== "HEAD") return next();
    res.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
    res.sendFile(indexHtml);
  });
} else {
  logger.warn({ dir: config.STATIC_DIR }, "Geen frontend-build gevonden — alleen de API is beschikbaar");
}

// ── Error handler ─────────────────────────────────────────────────────────────
app.use(errorHandler);

// ── Start ─────────────────────────────────────────────────────────────────────
if (config.NODE_ENV !== "test") {
  await initDb();
  app.listen(config.PORT, () => {
    logger.info(
      `VibeFinance gestart op http://localhost:${config.PORT} [${config.NODE_ENV}]` +
      (servesFrontend ? " — API + frontend" : " — alleen API")
    );
  });
}

export default app;