CC-Manager/server/src/app.ts

import { existsSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import Fastify, { type FastifyInstance } from 'fastify';
import cookie from '@fastify/cookie';
import helmet from '@fastify/helmet';
import multipart from '@fastify/multipart';
import rateLimit from '@fastify/rate-limit';
import fastifyStatic from '@fastify/static';
import { Prisma } from '@prisma/client';
import { env } from './env.js';
import { AppError } from './errors.js';
import { attachUser, blockUntilPasswordChanged, enforceCsrf } from './auth/guard.js';
import { authRoutes } from './routes/auth.routes.js';
import { playerRoutes } from './routes/players.routes.js';
import { creditRoutes } from './routes/credits.routes.js';
import { characterRoutes } from './routes/characters.routes.js';
import { importRoutes } from './routes/imports.routes.js';
import { adminRoutes } from './routes/admin.routes.js';

const here = dirname(fileURLToPath(import.meta.url));
// Im Container liegt das gebaute Frontend neben dem kompilierten Server.
const webRoot = join(here, '..', 'public');

function readStatusCode(error: unknown): number | undefined {
  const value = (error as { statusCode?: unknown }).statusCode;
  return typeof value === 'number' ? value : undefined;
}

function readMessage(error: unknown): string | undefined {
  const value = (error as { message?: unknown }).message;
  return typeof value === 'string' ? value : undefined;
}

export async function buildApp(): Promise<FastifyInstance> {
  const app = Fastify({
    logger: {
      level: env.LOG_LEVEL,
      redact: ['req.headers.cookie', 'req.headers.authorization'],
    },
    trustProxy: env.TRUST_PROXY,
    bodyLimit: 2 * 1024 * 1024,
  });

  await app.register(helmet, {
    contentSecurityPolicy: {
      directives: {
        defaultSrc: ["'self'"],
        scriptSrc: ["'self'"],
        // Der QR-Code der 2FA-Einrichtung kommt als data-URL.
        imgSrc: ["'self'", 'data:'],
        styleSrc: ["'self'", "'unsafe-inline'"],
        connectSrc: ["'self'"],
        objectSrc: ["'none'"],
        baseUri: ["'self'"],
        frameAncestors: ["'none'"],
        formAction: ["'self'"],
      },
    },
    crossOriginEmbedderPolicy: false,
    hsts: env.isProduction ? { maxAge: 31536000, includeSubDomains: true } : false,
  });

  await app.register(cookie, { secret: env.SESSION_SECRET });

  await app.register(rateLimit, {
    global: true,
    max: 300,
    timeWindow: '1 minute',
    allowList: () => !env.isProduction,
  });

  await app.register(multipart, {
    limits: { fileSize: 10 * 1024 * 1024, files: 1 },
  });

  app.addHook('onRequest', attachUser);
  app.addHook('onRequest', enforceCsrf);
  app.addHook('preHandler', blockUntilPasswordChanged);

  app.setErrorHandler((error, request, reply) => {
    if (error instanceof AppError) {
      reply.code(error.statusCode).send({ error: error.code, message: error.message });
      return;
    }

    if (error instanceof Prisma.PrismaClientKnownRequestError) {
      if (error.code === 'P2002') {
        reply.code(409).send({ error: 'UNIQUE_VIOLATION', message: 'Dieser Wert ist bereits vergeben' });
        return;
      }
      if (error.code === 'P2025') {
        reply.code(404).send({ error: 'NOT_FOUND', message: 'Datensatz nicht gefunden' });
        return;
      }
    }

    const statusCode = readStatusCode(error);

    if (statusCode === 429) {
      reply.code(429).send({ error: 'RATE_LIMITED', message: 'Zu viele Anfragen, bitte kurz warten' });
      return;
    }

    if (statusCode !== undefined && statusCode >= 400 && statusCode < 500) {
      reply
        .code(statusCode)
        .send({ error: 'BAD_REQUEST', message: readMessage(error) ?? 'Ungueltige Anfrage' });
      return;
    }

    request.log.error({ err: error }, 'Unbehandelter Fehler');
    reply.code(500).send({ error: 'INTERNAL', message: 'Interner Fehler' });
  });

  app.get('/api/health', async () => ({ status: 'ok' }));

  await app.register(authRoutes);
  await app.register(playerRoutes);
  await app.register(creditRoutes);
  await app.register(characterRoutes);
  await app.register(importRoutes);
  await app.register(adminRoutes);

  if (existsSync(webRoot)) {
    await app.register(fastifyStatic, {
      root: webRoot,
      prefix: '/',
      // Gehashte Assets duerfen lange liegen bleiben, index.html nie.
      maxAge: '1y',
      setHeaders: (res, path) => {
        if (path.endsWith('index.html')) {
          res.setHeader('Cache-Control', 'no-cache');
        }
      },
    });
  }

  // Alle nicht-API-Pfade gehen an die SPA, damit Deep-Links funktionieren.
  app.setNotFoundHandler((request, reply) => {
    if (request.url.startsWith('/api/')) {
      reply.code(404).send({ error: 'NOT_FOUND', message: 'Unbekannter Endpunkt' });
      return;
    }
    if (existsSync(webRoot)) {
      reply.sendFile('index.html');
      return;
    }
    reply.code(404).send({ error: 'NOT_FOUND', message: 'Frontend ist nicht gebaut' });
  });

  return app;
}