AI Implementation feature(820): Project Scaffold and Platform Foundations (#1)

tests/backend/admin-guard.spec.ts

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+process.env.DATABASE_PATH = ':memory:';
+process.env.THEMES_DIR = './themes';
+process.env.FRONTEND_DIST = './frontend/dist';
+
+import { Test } from '@nestjs/testing';
+import { INestApplication, ValidationPipe } from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import cookieParser from 'cookie-parser';
+import * as express from 'express';
+import request from 'supertest';
+import { CookieAccessInfo } from 'cookiejar';
+import { AppModule } from '../../backend/src/app.module';
+import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
+import { CsrfMiddleware } from '../../backend/src/common/middleware/csrf.middleware';
+import { ConfigService } from '@nestjs/config';
+import { initDb } from './db-helper';
+
+describe('Admin route protection', () => {
+  let app: INestApplication;
+  let adminToken: string;
+
+  beforeAll(async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
+    app = moduleRef.createNestApplication();
+    app.use(cookieParser());
+    app.use(express.json({ limit: '1mb' }));
+    const csrfMw = new CsrfMiddleware(app.get(ConfigService));
+    app.use((req: any, res: any, next: any) => csrfMw.use(req, res, next));
+    app.useGlobalPipes(new ValidationPipe({ whitelist: true, forbidNonWhitelisted: false, transform: true }));
+    const httpAdapterHost = app.get(HttpAdapterHost);
+    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
+    await app.init();
+    await initDb(app);
+
+    const server = app.getHttpServer();
+    await request(server).post('/api/v1/auth/register-first-admin')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+
+    const login = await request(server).post('/api/v1/auth/login')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+    adminToken = login.body.accessToken;
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  it('GET /api/v1/admin/users without a token returns 401', async () => {
+    await request(app.getHttpServer()).get('/api/v1/admin/users').expect(401);
+  });
+
+  it('GET /api/v1/admin/users with a player JWT returns 403', async () => {
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+
+    // Prime CSRF cookie first.
+    await agent.get('/api/v1/auth/csrf');
+    const cookies: any = agent.jar.getCookies(CookieAccessInfo.All);
+    const csrf = cookies.find((c: any) => c.name === 'csrf');
+
+    // Create a player via admin endpoint
+    await agent.post('/api/v1/admin/users')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .set('X-CSRF-Token', csrf.value)
+      .send({ username: 'player1', password: 'Sup3rSecret!Pass', role: 'player' })
+      .expect(201);
+
+    const playerLogin = await agent.post('/api/v1/auth/login')
+      .set('X-CSRF-Token', csrf.value)
+      .send({ username: 'player1', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+    const playerToken = playerLogin.body.accessToken;
+
+    await request(app.getHttpServer())
+      .get('/api/v1/admin/users')
+      .set('Authorization', `Bearer ${playerToken}`)
+      .expect(403);
+  });
+
+  it('GET /api/v1/admin/users with admin JWT returns 200 and lists users', async () => {
+    const res = await request(app.getHttpServer())
+      .get('/api/v1/admin/users')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .expect(200);
+    expect(Array.isArray(res.body)).toBe(true);
+    expect(res.body.length).toBeGreaterThanOrEqual(2);
+  });
+
+  it('DELETE /api/v1/admin/users/:id on the only admin returns 409 LAST_ADMIN', async () => {
+    const list = await request(app.getHttpServer())
+      .get('/api/v1/admin/users')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .expect(200);
+    const adminRow = list.body.find((u: any) => u.role === 'admin');
+    expect(adminRow).toBeDefined();
+
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+    await agent.get('/api/v1/auth/csrf');
+    const cookies: any = agent.jar.getCookies(CookieAccessInfo.All);
+    const csrf = cookies.find((c: any) => c.name === 'csrf');
+
+    await agent.delete(`/api/v1/admin/users/${adminRow.id}`)
+      .set('Authorization', `Bearer ${adminToken}`)
+      .set('X-CSRF-Token', csrf.value)
+      .expect(409);
+  });
+});

tests/backend/admin-validation.spec.ts

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+process.env.DATABASE_PATH = ':memory:';
+process.env.THEMES_DIR = './themes';
+process.env.FRONTEND_DIST = './frontend/dist';
+
+import { Test } from '@nestjs/testing';
+import { INestApplication, ValidationPipe } from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import cookieParser from 'cookie-parser';
+import * as express from 'express';
+import request from 'supertest';
+import { CookieAccessInfo } from 'cookiejar';
+import { AppModule } from '../../backend/src/app.module';
+import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
+import { DatabaseInitService } from '../../backend/src/database/database-init.service';
+
+describe('Admin route validation (Zod DTOs)', () => {
+  let app: INestApplication;
+  let adminToken: string;
+
+beforeAll(async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
+    app = moduleRef.createNestApplication();
+    app.use(express.json({ limit: '1mb' }));
+    app.use(cookieParser());
+    app.useGlobalPipes(new ValidationPipe({ whitelist: true, forbidNonWhitelisted: false, transform: true }));
+    const httpAdapterHost = app.get(HttpAdapterHost);
+    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
+    await app.init();
+    await app.get(DatabaseInitService).init();
+
+    const server = app.getHttpServer();
+    await request(server).post('/api/v1/auth/register-first-admin')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+
+    const login = await request(server).post('/api/v1/auth/login')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+    adminToken = login.body.accessToken;
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  async function primeCsrf(): Promise<{ agent: any; csrf: string }> {
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+    await agent.get('/api/v1/auth/csrf');
+    const cookies: any = agent.jar.getCookies(CookieAccessInfo.All);
+    return { agent, csrf: cookies.find((c: any) => c.name === 'csrf').value };
+  }
+
+  describe('POST /api/v1/admin/users', () => {
+    it('rejects missing username with 400', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent.post('/api/v1/admin/users')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf)
+        .send({ password: 'Sup3rSecret!Pass', role: 'player' });
+      expect(res.status).toBe(400);
+    });
+
+    it('rejects username with invalid characters with 400', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent.post('/api/v1/admin/users')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf)
+        .send({ username: 'bad name!', password: 'Sup3rSecret!Pass', role: 'player' });
+      expect(res.status).toBe(400);
+    });
+
+    it('rejects weak password with 400', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent.post('/api/v1/admin/users')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf)
+        .send({ username: 'goodname', password: 'short', role: 'player' });
+      expect(res.status).toBe(400);
+    });
+
+    it('rejects invalid role with 400', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent.post('/api/v1/admin/users')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf)
+        .send({ username: 'goodname', password: 'Sup3rSecret!Pass', role: 'god' });
+      expect(res.status).toBe(400);
+    });
+
+    it('accepts a well-formed body', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent
+        .post('/api/v1/admin/users')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf)
+        .set('Content-Type', 'application/json')
+        .send({ username: 'gooduser', password: 'Sup3rSecret!Pass', role: 'player' });
+      expect(res.status).toBe(201);
+    });
+  });
+
+  describe('PATCH /api/v1/admin/users/:id', () => {
+    it('rejects a non-UUID id with 400', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent.patch('/api/v1/admin/users/not-a-uuid')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf)
+        .send({ role: 'player' });
+      expect(res.status).toBe(400);
+    });
+
+    it('rejects an invalid role with 400', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent.patch('/api/v1/admin/users/00000000-0000-0000-0000-000000000000')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf)
+        .send({ role: 'superuser' });
+      expect(res.status).toBe(400);
+    });
+  });
+
+  describe('DELETE /api/v1/admin/users/:id', () => {
+    it('rejects a non-UUID id with 400', async () => {
+      const { agent, csrf } = await primeCsrf();
+      const res = await agent.delete('/api/v1/admin/users/not-a-uuid')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .set('X-CSRF-Token', csrf);
+      expect(res.status).toBe(400);
+    });
+  });
+
+  describe('GET /api/v1/admin/users?limit=...', () => {
+    it('rejects limit > 200 with 400', async () => {
+      const res = await request(app.getHttpServer())
+        .get('/api/v1/admin/users?limit=999')
+        .set('Authorization', `Bearer ${adminToken}`);
+      expect(res.status).toBe(400);
+    });
+
+    it('rejects limit=0 with 400', async () => {
+      const res = await request(app.getHttpServer())
+        .get('/api/v1/admin/users?limit=0')
+        .set('Authorization', `Bearer ${adminToken}`);
+      expect(res.status).toBe(400);
+    });
+
+    it('rejects non-numeric limit with 400', async () => {
+      const res = await request(app.getHttpServer())
+        .get('/api/v1/admin/users?limit=abc')
+        .set('Authorization', `Bearer ${adminToken}`);
+      expect(res.status).toBe(400);
+    });
+
+    it('accepts a valid limit and returns 200', async () => {
+      const res = await request(app.getHttpServer())
+        .get('/api/v1/admin/users?limit=10')
+        .set('Authorization', `Bearer ${adminToken}`);
+      expect(res.status).toBe(200);
+      expect(Array.isArray(res.body)).toBe(true);
+    });
+  });
+});

tests/backend/api-error.spec.ts

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+import { ApiError } from '../../backend/src/common/errors/api-error';
+import { ERROR_CODES } from '../../backend/src/common/errors/error-codes';
+
+describe('ApiError', () => {
+  it('formats validation errors with details', () => {
+    const e = ApiError.validation('Bad input', { field: 'x' });
+    expect(e.getStatus()).toBe(400);
+    const body = e.getResponse() as any;
+    expect(body.code).toBe(ERROR_CODES.VALIDATION_FAILED);
+    expect(body.message).toBe('Bad input');
+    expect(body.details).toEqual({ field: 'x' });
+  });
+
+  it('formats last-admin conflict', () => {
+    const e = ApiError.conflict(ERROR_CODES.LAST_ADMIN, 'Cannot delete the last admin');
+    expect(e.getStatus()).toBe(409);
+    const body = e.getResponse() as any;
+    expect(body.code).toBe(ERROR_CODES.LAST_ADMIN);
+  });
+
+  it('formats internal error as 500', () => {
+    const e = ApiError.internal();
+    expect(e.getStatus()).toBe(500);
+  });
+});

tests/backend/auth-refresh.spec.ts

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+process.env.DATABASE_PATH = ':memory:';
+process.env.THEMES_DIR = './themes';
+process.env.FRONTEND_DIST = './frontend/dist';
+
+import { Test } from '@nestjs/testing';
+import { INestApplication, ValidationPipe } from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import cookieParser from 'cookie-parser';
+import * as express from 'express';
+import request from 'supertest';
+import { CookieAccessInfo } from 'cookiejar';
+import { AppModule } from '../../backend/src/app.module';
+import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
+import { CsrfMiddleware } from '../../backend/src/common/middleware/csrf.middleware';
+import { ConfigService } from '@nestjs/config';
+import { initDb } from './db-helper';
+import { DatabaseInitService } from '../../backend/src/database/database-init.service';
+
+describe('Auth refresh rotation', () => {
+  let app: INestApplication;
+
+beforeAll(async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
+    app = moduleRef.createNestApplication();
+    app.use(cookieParser());
+    app.use(express.json({ limit: '1mb' }));
+    const csrfMw = new CsrfMiddleware(app.get(ConfigService));
+    app.use((req: any, res: any, next: any) => csrfMw.use(req, res, next));
+    app.useGlobalPipes(new ValidationPipe({ whitelist: true, forbidNonWhitelisted: false, transform: true }));
+    const httpAdapterHost = app.get(HttpAdapterHost);
+    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
+    await app.init();
+    await initDb(app);
+
+    const server = app.getHttpServer();
+    await request(server).post('/api/v1/auth/register-first-admin')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  it('GET /api/v1/auth/csrf always sets the cookie and returns a non-empty token', async () => {
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+    const res = await agent.get('/api/v1/auth/csrf').expect(200);
+    expect(res.body.csrfToken).toBeDefined();
+    expect(res.body.csrfToken.length).toBeGreaterThan(0);
+    const cookies = res.headers['set-cookie'] as unknown as string[];
+    expect(cookies?.some((c) => c.startsWith('csrf='))).toBe(true);
+  });
+
+  it('login returns an access token and sets the rt refresh cookie', async () => {
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+
+    const res = await agent.post('/api/v1/auth/login')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+    expect(res.body.accessToken).toBeDefined();
+    const cookies = res.headers['set-cookie'] as unknown as string[];
+    const rt = cookies.find((c) => c.startsWith('rt='));
+    expect(rt).toBeDefined();
+    expect(rt).toMatch(/HttpOnly/);
+  });
+
+  it('refresh rotates the refresh cookie and returns a new access token', async () => {
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+
+    await agent.post('/api/v1/auth/login')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+
+    const cookies: any = agent.jar.getCookies(CookieAccessInfo.All);
+    const rt = cookies.find((c: any) => c.name === 'rt');
+    const csrf = cookies.find((c: any) => c.name === 'csrf');
+    expect(rt).toBeDefined();
+    expect(csrf).toBeDefined();
+
+    const refresh = await agent.post('/api/v1/auth/refresh')
+      .set('X-CSRF-Token', csrf.value)
+      .set('Cookie', `rt=${rt.value}`)
+      .send({})
+      .expect(200);
+    expect(refresh.body.accessToken).toBeDefined();
+    expect(refresh.body.user.username).toBe('admin');
+  });
+
+  it('logout invalidates the refresh token', async () => {
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+
+    await agent.post('/api/v1/auth/login')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+
+    const cookies: any = agent.jar.getCookies(CookieAccessInfo.All);
+    const rt = cookies.find((c: any) => c.name === 'rt');
+    const csrf = cookies.find((c: any) => c.name === 'csrf');
+
+    await agent.post('/api/v1/auth/logout')
+      .set('X-CSRF-Token', csrf.value)
+      .set('Cookie', `rt=${rt.value}`)
+      .send({})
+      .expect(204);
+
+    // Reusing the same refresh cookie must fail
+    await agent.post('/api/v1/auth/refresh')
+      .set('X-CSRF-Token', csrf.value)
+      .set('Cookie', `rt=${rt.value}`)
+      .send({})
+      .expect(401);
+  });
+});

tests/backend/bootstrap.integration.spec.ts

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+process.env.DATABASE_PATH = ':memory:';
+process.env.THEMES_DIR = './themes';
+process.env.FRONTEND_DIST = './frontend/dist';
+
+import { Test } from '@nestjs/testing';
+import { INestApplication, ValidationPipe } from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import { AppModule } from '../../backend/src/app.module';
+import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
+import { csrfClient, primeCsrf } from './csrf-client';
+import { initDb } from './db-helper';
+
+describe('Bootstrap integration', () => {
+  let app: INestApplication;
+
+  beforeAll(async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
+    app = moduleRef.createNestApplication();
+    app.useGlobalPipes(new ValidationPipe({ whitelist: true, forbidNonWhitelisted: false, transform: true }));
+    const httpAdapterHost = app.get(HttpAdapterHost);
+    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
+    await app.init();
+    await initDb(app);
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  it('a: bootstrap before any admin', async () => {
+    const c = csrfClient(app);
+    const res = await c.get('/api/v1/bootstrap').expect(200);
+    expect(res.body.initialized).toBe(false);
+    expect(res.body.theme).toBeDefined();
+    expect(res.body.theme.tokens.primary).toMatch(/^#/);
+  });
+
+  it('b: event status is Stopped or Running', async () => {
+    const c = csrfClient(app);
+    const res = await c.get('/api/v1/event/status').expect(200);
+    expect(['Stopped', 'Running']).toContain(res.body.status);
+    expect(typeof res.body.countdownMs).toBe('number');
+  });
+
+  it('c: register-first-admin rejects weak password', async () => {
+    const c = csrfClient(app);
+    await c.post('/api/v1/auth/register-first-admin')
+      .send({ username: 'weak', password: '123' })
+      .expect(400);
+  });
+
+  it('d: register-first-admin with valid creds creates admin', async () => {
+    const c = csrfClient(app);
+    const res = await c.post('/api/v1/auth/register-first-admin')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+    expect(res.body.accessToken).toBeDefined();
+    expect(res.body.user.role).toBe('admin');
+  });
+
+  it('e: bootstrap now reports initialized=true', async () => {
+    const c = csrfClient(app);
+    const res = await c.get('/api/v1/bootstrap').expect(200);
+    expect(res.body.initialized).toBe(true);
+  });
+
+  it('f: register-first-admin now refuses (system initialized)', async () => {
+    const c = csrfClient(app);
+    await c.post('/api/v1/auth/register-first-admin')
+      .send({ username: 'second', password: 'Sup3rSecret!Pass' })
+      .expect(409);
+  });
+});

tests/backend/csrf-client.ts

@@ -0,0 +1,46 @@
+import request from 'supertest';
+import type { INestApplication } from '@nestjs/common';
+import { CookieAccessInfo } from 'cookiejar';
+
+const csrfSkipPaths = new Set<string>(['/api/v1/auth/login', '/api/v1/auth/register-first-admin']);
+
+function attachCsrfHeader(test: request.Test, method: string, path: string, agent: any): request.Test {
+  if (!['POST', 'PUT', 'PATCH', 'DELETE'].includes(method.toUpperCase())) return test;
+  if (csrfSkipPaths.has(path)) return test;
+  const jar = agent.jar;
+  if (!jar || typeof jar.getCookies !== 'function') return test;
+  const cookies: any[] = jar.getCookies(CookieAccessInfo.All);
+  if (process.env.CSRF_DEBUG) console.log('[csrf-client] all cookies in jar:', cookies.map((c: any) => ({ name: c.name, path: c.path })), 'for path', path);
+  const csrfCookie = cookies.find((c: any) => c.name === 'csrf');
+  if (!csrfCookie) return test;
+  const csrf = decodeURIComponent(csrfCookie.value ?? '');
+  if (csrf) test.set('X-CSRF-Token', csrf);
+  return test;
+}
+
+export function csrfClient(app: INestApplication): {
+  get: (path: string) => request.Test;
+  post: (path: string) => request.Test;
+  put: (path: string) => request.Test;
+  patch: (path: string) => request.Test;
+  delete: (path: string) => request.Test;
+} {
+  const server = app.getHttpServer();
+  const agent = request.agent(server);
+  return {
+    get: (path: string) => agent.get(path),
+    post: (path: string) => attachCsrfHeader(agent.post(path), 'POST', path, agent),
+    put: (path: string) => attachCsrfHeader(agent.put(path), 'PUT', path, agent),
+    patch: (path: string) => attachCsrfHeader(agent.patch(path), 'PATCH', path, agent),
+    delete: (path: string) => attachCsrfHeader(agent.delete(path), 'DELETE', path, agent),
+  };
+}
+
+export async function primeCsrf(app: INestApplication): Promise<string> {
+  const server = app.getHttpServer();
+  const agent = request.agent(server);
+  const res = await agent.get('/api/v1/auth/csrf');
+  const cookieHeader = (res.headers['set-cookie'] as unknown as string[] | undefined)?.find((c) => c.startsWith('csrf='));
+  const token = cookieHeader ? cookieHeader.split(';')[0].split('=')[1] : '';
+  return decodeURIComponent(token);
+}

tests/backend/database-init.spec.ts

@@ -0,0 +1,65 @@
+import { Test } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { validateEnv } from '../../backend/src/config/env.schema';
+import { DatabaseModule } from '../../backend/src/database/database.module';
+import { DatabaseInitService } from '../../backend/src/database/database-init.service';
+import { CategoryEntity } from '../../backend/src/database/entities/category.entity';
+import { SettingEntity } from '../../backend/src/database/entities/setting.entity';
+
+describe('DatabaseInitService', () => {
+  let app: INestApplication;
+  let init: DatabaseInitService;
+
+  beforeAll(async () => {
+    process.env.DATABASE_PATH = ':memory:';
+    process.env.THEMES_DIR = './themes';
+    process.env.FRONTEND_DIST = './frontend/dist';
+
+    const moduleRef = await Test.createTestingModule({
+      imports: [
+        ConfigModule.forRoot({ isGlobal: true, validate: validateEnv }),
+        DatabaseModule,
+      ],
+    }).compile();
+    app = moduleRef.createNestApplication();
+    init = app.get(DatabaseInitService);
+  });
+
+  afterAll(async () => {
+    if (app) await app.close();
+  });
+
+  it('creates the schema and seed data on first init()', async () => {
+    await init.init();
+    const ds = (init as any).dataSource;
+    expect(ds.isInitialized).toBe(true);
+    const tables: any[] = await ds.query("SELECT name FROM sqlite_master WHERE type='table'");
+    const names = tables.map((t) => t.name);
+    expect(names).toEqual(expect.arrayContaining([
+      'user', 'setting', 'category', 'challenge', 'challenge_file',
+      'solve', 'refresh_token', 'blog_post',
+    ]));
+
+    const categories = await ds.getRepository(CategoryEntity).find();
+    const systemCats = categories.filter((c: any) => c.systemKey);
+    expect(systemCats.length).toBeGreaterThanOrEqual(6);
+
+    const settings = await ds.getRepository(SettingEntity).find();
+    const keys = settings.map((s: any) => s.key);
+    expect(keys).toEqual(expect.arrayContaining([
+      'pageTitle', 'logo', 'welcomeMarkdown', 'themeKey',
+      'defaultChallengeIp', 'registrationsEnabled',
+      'eventStartUtc', 'eventEndUtc',
+    ]));
+  });
+
+  it('is idempotent — calling init() twice does not duplicate migrations or seeds', async () => {
+    await init.init();
+    await init.init();
+    const ds = (init as any).dataSource;
+    const categories = await ds.getRepository(CategoryEntity).find();
+    const systemCats = categories.filter((c: any) => c.systemKey);
+    expect(systemCats.length).toBe(6);
+  });
+});

tests/backend/db-helper.ts

@@ -0,0 +1,11 @@
+import { INestApplication } from '@nestjs/common';
+import { DatabaseInitService } from '../../backend/src/database/database-init.service';
+
+/**
+ * Await database initialization (migrations + seed verification) on the
+ * given Nest app. Without this, integration tests that hit controllers
+ * will hit a fresh `:memory:` SQLite database with no tables.
+ */
+export async function initDb(app: INestApplication): Promise<void> {
+  await app.get<DatabaseInitService>(DatabaseInitService).init();
+}

tests/backend/env-schema.spec.ts

@@ -0,0 +1,23 @@
+import { envSchema, SYSTEM_CATEGORY_KEYS, SETTINGS_KEYS } from '../../backend/src/config/env.schema';
+
+describe('envSchema', () => {
+  it('accepts minimal valid env', () => {
+    const r = envSchema.safeParse({});
+    expect(r.success).toBe(true);
+  });
+
+  it('rejects invalid PORT', () => {
+    const r = envSchema.safeParse({ PORT: 'not-a-number' });
+    expect(r.success).toBe(false);
+  });
+
+  it('rejects short JWT secrets', () => {
+    const r = envSchema.safeParse({ JWT_ACCESS_SECRET: 'short' });
+    expect(r.success).toBe(false);
+  });
+
+  it('exposes the canonical system category and settings keys', () => {
+    expect(SYSTEM_CATEGORY_KEYS).toEqual(['crypto', 'forensics', 'pwn', 'web', 'misc', 'osint']);
+    expect(SETTINGS_KEYS.THEME_KEY).toBe('themeKey');
+  });
+});

tests/backend/event-status.spec.ts

@@ -0,0 +1,41 @@
+import { EventStatusService } from '../../backend/src/common/services/event-status.service';
+
+describe('EventStatusService', () => {
+  const settings = {
+    get: jest.fn(),
+  } as any;
+
+  beforeEach(() => {
+    settings.get.mockReset();
+  });
+
+  it('returns Stopped before start with positive countdown', async () => {
+    const start = new Date(Date.now() + 60_000).toISOString();
+    const end = new Date(Date.now() + 120_000).toISOString();
+    settings.get.mockImplementation(async (k: string) => (k === 'eventStartUtc' ? start : end));
+    const svc = new EventStatusService(settings);
+    const s = await svc.getStatus();
+    expect(s.status).toBe('Stopped');
+    expect(s.countdownMs).toBeGreaterThan(0);
+  });
+
+  it('returns Running between start and end', async () => {
+    const start = new Date(Date.now() - 30_000).toISOString();
+    const end = new Date(Date.now() + 60_000).toISOString();
+    settings.get.mockImplementation(async (k: string) => (k === 'eventStartUtc' ? start : end));
+    const svc = new EventStatusService(settings);
+    const s = await svc.getStatus();
+    expect(s.status).toBe('Running');
+    expect(s.countdownMs).toBeGreaterThan(0);
+  });
+
+  it('returns Stopped after end with zero countdown', async () => {
+    const start = new Date(Date.now() - 120_000).toISOString();
+    const end = new Date(Date.now() - 60_000).toISOString();
+    settings.get.mockImplementation(async (k: string) => (k === 'eventStartUtc' ? start : end));
+    const svc = new EventStatusService(settings);
+    const s = await svc.getStatus();
+    expect(s.status).toBe('Stopped');
+    expect(s.countdownMs).toBe(0);
+  });
+});

tests/backend/last-admin-invariant.spec.ts

@@ -0,0 +1,81 @@
+import { UsersService } from '../../backend/src/modules/users/users.service';
+import { DataSource } from 'typeorm';
+import { UserEntity } from '../../backend/src/database/entities/user.entity';
+import { ApiError } from '../../backend/src/common/errors/api-error';
+import { ERROR_CODES } from '../../backend/src/common/errors/error-codes';
+
+describe('UsersService.enforceLastAdminInvariant', () => {
+  let ds: DataSource;
+  let svc: UsersService;
+
+  beforeAll(async () => {
+    ds = new DataSource({
+      type: 'better-sqlite3',
+      database: ':memory:',
+      entities: [UserEntity],
+      synchronize: true,
+      logging: false,
+    });
+    await ds.initialize();
+    svc = new UsersService(ds.getRepository(UserEntity));
+  });
+
+  afterAll(async () => {
+    await ds.destroy();
+  });
+
+  beforeEach(async () => {
+    await ds.getRepository(UserEntity).clear();
+  });
+
+  it('throws LAST_ADMIN when demoting the only admin', async () => {
+    const repo = ds.getRepository(UserEntity);
+    const admin = repo.create({
+      id: 'a1', username: 'admin', passwordHash: 'x', role: 'admin', status: 'enabled', createdAt: new Date().toISOString(),
+    });
+    await repo.save(admin);
+
+    await expect(
+      ds.transaction(async (manager) => svc.enforceLastAdminInvariant(manager, 'a1', 'player')),
+    ).rejects.toMatchObject({
+      response: { code: ERROR_CODES.LAST_ADMIN },
+    });
+  });
+
+  it('throws LAST_ADMIN when deleting the only admin', async () => {
+    const repo = ds.getRepository(UserEntity);
+    const admin = repo.create({
+      id: 'a1', username: 'admin', passwordHash: 'x', role: 'admin', status: 'enabled', createdAt: new Date().toISOString(),
+    });
+    await repo.save(admin);
+
+    await expect(
+      ds.transaction(async (manager) => svc.enforceLastAdminInvariant(manager, 'a1')),
+    ).rejects.toMatchObject({
+      response: { code: ERROR_CODES.LAST_ADMIN },
+    });
+  });
+
+  it('does NOT throw when more than one admin exists', async () => {
+    const repo = ds.getRepository(UserEntity);
+    await repo.save([
+      repo.create({ id: 'a1', username: 'a1', passwordHash: 'x', role: 'admin', status: 'enabled', createdAt: new Date().toISOString() }),
+      repo.create({ id: 'a2', username: 'a2', passwordHash: 'x', role: 'admin', status: 'enabled', createdAt: new Date().toISOString() }),
+    ]);
+
+    await expect(
+      ds.transaction(async (manager) => svc.enforceLastAdminInvariant(manager, 'a1', 'player')),
+    ).resolves.toBeUndefined();
+  });
+
+  it('does NOT throw when demoting a non-admin', async () => {
+    const repo = ds.getRepository(UserEntity);
+    await repo.save([
+      repo.create({ id: 'a1', username: 'a1', passwordHash: 'x', role: 'admin', status: 'enabled', createdAt: new Date().toISOString() }),
+      repo.create({ id: 'p1', username: 'p1', passwordHash: 'x', role: 'player', status: 'enabled', createdAt: new Date().toISOString() }),
+    ]);
+    await expect(
+      ds.transaction(async (manager) => svc.enforceLastAdminInvariant(manager, 'p1', 'admin')),
+    ).resolves.toBeUndefined();
+  });
+});

tests/backend/login-backoff.spec.ts

@@ -0,0 +1,24 @@
+import { LoginBackoffService } from '../../backend/src/common/services/login-backoff.service';
+
+describe('LoginBackoffService', () => {
+  it('starts unblocked', () => {
+    const s = new LoginBackoffService();
+    expect(s.isBlocked('1.1.1.1', 'alice', 1000)).toBe(0);
+  });
+
+  it('blocks after repeated failures and resets on success', () => {
+    const s = new LoginBackoffService();
+    const now = 1000;
+    for (let i = 0; i < 5; i++) s.recordFailure('1.1.1.1', 'alice', now);
+    expect(s.isBlocked('1.1.1.1', 'alice', now + 100)).toBeGreaterThan(0);
+    s.reset('1.1.1.1', 'alice');
+    expect(s.isBlocked('1.1.1.1', 'alice', now + 100)).toBe(0);
+  });
+
+  it('is per (ip, username)', () => {
+    const s = new LoginBackoffService();
+    for (let i = 0; i < 6; i++) s.recordFailure('1.1.1.1', 'alice', 1000 + i);
+    expect(s.isBlocked('1.1.1.1', 'alice', 1100)).toBeGreaterThan(0);
+    expect(s.isBlocked('1.1.1.1', 'bob', 1100)).toBe(0);
+  });
+});

tests/backend/migrations.spec.ts

@@ -0,0 +1,69 @@
+import * as path from 'path';
+import { MigrationInterface, QueryRunner } from 'typeorm';
+import { InitSchema1700000000000 } from '../../backend/src/database/migrations/1700000000000-InitSchema';
+import { SeedSystemData1700000000100 } from '../../backend/src/database/migrations/1700000000100-SeedSystemData';
+import { DataSource } from 'typeorm';
+import { UserEntity } from '../../backend/src/database/entities/user.entity';
+import { SettingEntity } from '../../backend/src/database/entities/setting.entity';
+import { CategoryEntity } from '../../backend/src/database/entities/category.entity';
+import { ChallengeEntity } from '../../backend/src/database/entities/challenge.entity';
+import { ChallengeFileEntity } from '../../backend/src/database/entities/challenge-file.entity';
+import { SolveEntity } from '../../backend/src/database/entities/solve.entity';
+import { RefreshTokenEntity } from '../../backend/src/database/entities/refresh-token.entity';
+import { BlogPostEntity } from '../../backend/src/database/entities/blog-post.entity';
+
+describe('Migrations', () => {
+  let dataSource: DataSource;
+
+  beforeAll(async () => {
+    dataSource = new DataSource({
+      type: 'better-sqlite3',
+      database: ':memory:',
+      entities: [UserEntity, SettingEntity, CategoryEntity, ChallengeEntity, ChallengeFileEntity, SolveEntity, RefreshTokenEntity, BlogPostEntity],
+      migrations: [InitSchema1700000000000, SeedSystemData1700000000100],
+      migrationsRun: true,
+      synchronize: false,
+      logging: false,
+    });
+    await dataSource.initialize();
+  });
+
+  afterAll(async () => {
+    await dataSource.destroy();
+  });
+
+  it('creates all required tables', async () => {
+    const tables = await dataSource.query("SELECT name FROM sqlite_master WHERE type='table'");
+    const names = tables.map((t: any) => t.name);
+    expect(names).toEqual(expect.arrayContaining([
+      'user', 'setting', 'category', 'challenge', 'challenge_file',
+      'solve', 'refresh_token', 'blog_post',
+    ]));
+  });
+
+  it('seeds 6 system categories with unique system_keys', async () => {
+    const cats = await dataSource.getRepository(CategoryEntity).find();
+    const systemCats = cats.filter((c) => c.systemKey);
+    expect(systemCats.length).toBeGreaterThanOrEqual(6);
+    const keys = systemCats.map((c) => c.systemKey);
+    expect(new Set(keys).size).toBe(keys.length);
+  });
+
+  it('seeds default settings', async () => {
+    const settings = await dataSource.getRepository(SettingEntity).find();
+    const keys = settings.map((s) => s.key);
+    expect(keys).toEqual(expect.arrayContaining(['pageTitle', 'themeKey', 'eventStartUtc', 'eventEndUtc']));
+  });
+
+  it('enforces UNIQUE(challengeId, userId) on solve', async () => {
+    const indexes = await dataSource.query("SELECT name, sql FROM sqlite_master WHERE type='index' AND tbl_name='solve'");
+    const uq = indexes.find((i: any) => /UNIQUE.*challenge_id.*user_id/i.test(i.sql || ''));
+    expect(uq).toBeDefined();
+  });
+
+  it('enforces ON DELETE RESTRICT FK on solve', async () => {
+    const fks = await dataSource.query("PRAGMA foreign_key_list('solve')");
+    const restrict = fks.filter((f: any) => f.on_delete === 'RESTRICT');
+    expect(restrict.length).toBeGreaterThanOrEqual(2);
+  });
+});

tests/backend/openapi31.spec.ts

@@ -0,0 +1,97 @@
+import { toOpenApi31 } from '../../backend/src/common/utils/openapi31';
+
+describe('toOpenApi31', () => {
+  it('sets openapi to 3.1.0', () => {
+    const doc: any = toOpenApi31({ openapi: '3.0.0', info: { title: 'X', version: '1' }, paths: {} });
+    expect(doc.openapi).toBe('3.1.0');
+  });
+
+  it('preserves info title and version', () => {
+    const doc: any = toOpenApi31({ openapi: '3.0.0', info: { title: 'HIPCTF', version: '1.0.0' }, paths: {} });
+    expect(doc.info.title).toBe('HIPCTF');
+    expect(doc.info.version).toBe('1.0.0');
+  });
+
+  it('rewrites nullable=true to type union with null', () => {
+    const doc: any = toOpenApi31({
+      openapi: '3.0.0',
+      info: { title: 't', version: 'v' },
+      paths: {},
+      components: {
+        schemas: {
+          Foo: { type: 'object', properties: { name: { type: 'string', nullable: true } } },
+        },
+      },
+    });
+    expect(doc.components.schemas.Foo.properties.name).toEqual({ type: ['string', 'null'] });
+    expect(doc.components.schemas.Foo.properties.name.nullable).toBeUndefined();
+  });
+
+  it('handles nullable without an explicit type', () => {
+    const doc: any = toOpenApi31({
+      openapi: '3.0.0',
+      info: { title: 't', version: 'v' },
+      paths: {},
+      components: { schemas: { Bar: { nullable: true } } },
+    });
+    expect(doc.components.schemas.Bar).toEqual({ type: ['null'] });
+  });
+
+  it('preserves $ref nodes', () => {
+    const doc: any = toOpenApi31({
+      openapi: '3.0.0',
+      info: { title: 't', version: 'v' },
+      paths: {},
+      components: {
+        schemas: {
+          Foo: { $ref: '#/components/schemas/Bar' },
+        },
+      },
+    });
+    expect(doc.components.schemas.Foo).toEqual({ $ref: '#/components/schemas/Bar' });
+  });
+
+  it('recurses into array items, oneOf, anyOf, allOf', () => {
+    const doc: any = toOpenApi31({
+      openapi: '3.0.0',
+      info: { title: 't', version: 'v' },
+      paths: {},
+      components: {
+        schemas: {
+          Foo: {
+            type: 'object',
+            properties: {
+              arr: { type: 'array', items: { type: 'string', nullable: true } },
+              union: { oneOf: [{ type: 'string', nullable: true }] },
+            },
+          },
+        },
+      },
+    });
+    expect(doc.components.schemas.Foo.properties.arr.items).toEqual({ type: ['string', 'null'] });
+    expect(doc.components.schemas.Foo.properties.union.oneOf[0]).toEqual({ type: ['string', 'null'] });
+  });
+
+  it('rewrites nullable in path parameters and request bodies', () => {
+    const doc: any = toOpenApi31({
+      openapi: '3.0.0',
+      info: { title: 't', version: 'v' },
+      paths: {
+        '/x': {
+          get: {
+            parameters: [{ name: 'q', in: 'query', schema: { type: 'string', nullable: true } }],
+            requestBody: {
+              content: {
+                'application/json': { schema: { type: 'object', properties: { p: { type: 'integer', nullable: true } } } },
+              },
+            },
+          },
+        },
+      },
+    });
+    const params = doc.paths['/x'].get.parameters;
+    expect(params[0].schema).toEqual({ type: ['string', 'null'] });
+    const bodySchema = doc.paths['/x'].get.requestBody.content['application/json'].schema;
+    expect(bodySchema.properties.p).toEqual({ type: ['integer', 'null'] });
+  });
+});

tests/backend/registration-rate-limit.spec.ts

@@ -0,0 +1,80 @@
+process.env.DATABASE_PATH = ':memory:';
+process.env.THEMES_DIR = './themes';
+process.env.FRONTEND_DIST = './frontend/dist';
+
+import { RegistrationRateLimitService } from '../../backend/src/common/services/registration-rate-limit.service';
+import { Test } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import cookieParser from 'cookie-parser';
+import * as express from 'express';
+import request from 'supertest';
+import { AppModule } from '../../backend/src/app.module';
+import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
+import { CsrfMiddleware } from '../../backend/src/common/middleware/csrf.middleware';
+import { ConfigService } from '@nestjs/config';
+import { initDb } from './db-helper';
+
+describe('RegistrationRateLimitService', () => {
+  it('allows up to 10 per minute per IP', () => {
+    const s = new RegistrationRateLimitService();
+    const now = 1_000_000;
+    for (let i = 0; i < 10; i++) {
+      expect(s.isAllowed('1.1.1.1', now + i)).toBe(true);
+      s.record('1.1.1.1', now + i);
+    }
+    expect(s.isAllowed('1.1.1.1', now + 10)).toBe(false);
+  });
+
+  it('isolates per IP', () => {
+    const s = new RegistrationRateLimitService();
+    const now = 1_000_000;
+    for (let i = 0; i < 10; i++) s.record('1.1.1.1', now + i);
+    expect(s.isAllowed('2.2.2.2', now + 10)).toBe(true);
+  });
+});
+
+describe('register-first-admin registration rate limit (integration)', () => {
+  let app: INestApplication;
+  let limiter: RegistrationRateLimitService;
+
+  beforeAll(async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
+    app = moduleRef.createNestApplication();
+    app.use(cookieParser());
+    app.use(express.json({ limit: '1mb' }));
+    const csrfMw = new CsrfMiddleware(app.get(ConfigService));
+    app.use((req: any, res: any, next: any) => csrfMw.use(req, res, next));
+    const httpAdapterHost = app.get(HttpAdapterHost);
+    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
+    await app.init();
+    await initDb(app);
+    limiter = app.get(RegistrationRateLimitService);
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  it('returns 429 once the per-IP cap is reached', async () => {
+    // Prime the limiter for the IP that supertest will use. The default
+    // Express socket address is IPv6-mapped IPv4 ('::ffff:127.0.0.1') on
+    // most platforms; priming both forms keeps the test stable.
+    const now = Date.now();
+    for (let i = 0; i < 10; i++) {
+      limiter.record('127.0.0.1', now + i);
+      limiter.record('::ffff:127.0.0.1', now + i);
+    }
+
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+    await agent.get('/api/v1/auth/csrf');
+    const cookies: any = agent.jar.getCookies(require('cookiejar').CookieAccessInfo.All);
+    const csrf = cookies.find((c: any) => c.name === 'csrf');
+
+    await agent.post('/api/v1/auth/register-first-admin')
+      .set('X-CSRF-Token', csrf.value)
+      .send({ username: 'noone', password: 'Sup3rSecret!Pass' })
+      .expect(429);
+  });
+});

tests/backend/sse-flatten.spec.ts

@@ -0,0 +1,62 @@
+process.env.DATABASE_PATH = ':memory:';
+process.env.THEMES_DIR = './themes';
+process.env.FRONTEND_DIST = './frontend/dist';
+
+import { Test } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import request from 'supertest';
+import { AppModule } from '../../backend/src/app.module';
+import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
+
+describe('SSE flattened payloads', () => {
+  let app: INestApplication;
+
+  beforeAll(async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
+    app = moduleRef.createNestApplication();
+    const httpAdapterHost = app.get(HttpAdapterHost);
+    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
+    await app.init();
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+
+  it('event/stream emits a flattened { status, countdownMs, serverNowUtc, startUtc, endUtc } payload', (done) => {
+    const server = app.getHttpServer();
+    const req = request(server).get('/api/v1/event/stream');
+    let received = false;
+    req
+      .buffer(true)
+      .parse((res, cb) => {
+        const chunks: Buffer[] = [];
+        res.on('data', (chunk: Buffer) => {
+          chunks.push(chunk);
+          if (received) return;
+          const text = Buffer.concat(chunks).toString('utf8');
+          const match = /data: ({.*?})\n/.exec(text);
+          if (match) {
+            try {
+              const payload = JSON.parse(match[1]);
+              expect(payload).toHaveProperty('status');
+              expect(payload).toHaveProperty('countdownMs');
+              expect(payload).toHaveProperty('serverNowUtc');
+              expect(payload).toHaveProperty('startUtc');
+              expect(payload).toHaveProperty('endUtc');
+              expect(['Stopped', 'Running']).toContain(payload.status);
+              received = true;
+              (res as any).destroy();
+              done();
+            } catch (e) {
+              done(e);
+            }
+          }
+        });
+        res.on('end', () => cb(null, Buffer.concat(chunks)));
+        res.on('error', (err) => cb(err, null));
+      })
+      .end(() => {});
+  }, 10_000);
+});

tests/backend/theme-loader.spec.ts

@@ -0,0 +1,49 @@
+import * as path from 'path';
+import * as fs from 'fs';
+import * as os from 'os';
+import { ThemeLoaderService } from '../../backend/src/common/utils/theme-loader.service';
+
+describe('ThemeLoaderService', () => {
+  const config = { get: jest.fn() } as any;
+  // ThemeLoaderService now takes SettingsService for the configured-theme
+  // validation step. We pass a stub that always returns 'classic' so the
+  // existing tests focus on disk loading + lookup behavior.
+  const settings = { get: jest.fn().mockResolvedValue('classic') } as any;
+
+  it('falls back to default and warns on unknown theme id', () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
+    fs.writeFileSync(path.join(tmp, 'classic.json'), JSON.stringify({ id: 'classic', name: 'Classic', tokens: { primary: '#000', secondary: '#111', accent: '#222', surface: '#fff', text: '#000', success: '#0f0', warning: '#ff0', danger: '#f00', fontFamily: 'sans', radii: { sm: '1px', md: '2px', lg: '3px' }, spacingScale: [4, 8] } }));
+    config.get.mockImplementation((k: string, d: any) => (k === 'THEMES_DIR' ? tmp : d));
+    const svc = new ThemeLoaderService(config, settings);
+    return svc.onModuleInit().then(() => {
+      const t = svc.getTheme('does-not-exist');
+      expect(t.id).toBe('classic');
+      expect(t.tokens.primary).toBe('#000');
+    });
+  });
+
+  it('loads a valid theme by id', () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
+    const theme = { id: 'classic', name: 'Classic', tokens: { primary: '#000', secondary: '#111', accent: '#222', surface: '#fff', text: '#000', success: '#0f0', warning: '#ff0', danger: '#f00', fontFamily: 'sans', radii: { sm: '1px', md: '2px', lg: '3px' }, spacingScale: [4, 8] } };
+    fs.writeFileSync(path.join(tmp, 'classic.json'), JSON.stringify(theme));
+    config.get.mockImplementation((k: string, d: any) => (k === 'THEMES_DIR' ? tmp : d));
+    const svc = new ThemeLoaderService(config, settings);
+    return svc.onModuleInit().then(() => {
+      const t = svc.getTheme('classic');
+      expect(t.id).toBe('classic');
+      expect(t.tokens.spacingScale).toEqual([4, 8]);
+    });
+  });
+
+  it('skips invalid theme files', () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
+    fs.writeFileSync(path.join(tmp, 'classic.json'), JSON.stringify({ id: 'classic', name: 'Classic', tokens: { primary: '#000' } })); // missing required
+    config.get.mockImplementation((k: string, d: any) => (k === 'THEMES_DIR' ? tmp : d));
+    const svc = new ThemeLoaderService(config, settings);
+    return svc.onModuleInit().then(() => {
+      // Falls back to builtins; classic should be findable via builtins
+      const t = svc.getTheme('classic');
+      expect(t).toBeDefined();
+    });
+  });
+});

tests/backend/theme-required.spec.ts

@@ -0,0 +1,101 @@
+import * as path from 'path';
+import * as fs from 'fs';
+import * as os from 'os';
+import { Test } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { validateEnv, SETTINGS_KEYS } from '../../backend/src/config/env.schema';
+import { ThemeLoaderService } from '../../backend/src/common/utils/theme-loader.service';
+import { SettingsModule, SettingsService } from '../../backend/src/modules/settings/settings.module';
+import { CommonModule } from '../../backend/src/common/common.module';
+import { DatabaseModule } from '../../backend/src/database/database.module';
+import { DatabaseInitService } from '../../backend/src/database/database-init.service';
+import { THEME_IDS } from '../../backend/src/common/types/theme-ids';
+
+describe('ThemeLoaderService - require 10 + validate configured key', () => {
+  let app: INestApplication;
+  let svc: ThemeLoaderService;
+
+  async function buildApp(themeDir: string, themeKey: string): Promise<void> {
+    process.env.THEMES_DIR = themeDir;
+    process.env.DATABASE_PATH = ':memory:';
+    process.env.FRONTEND_DIST = './frontend/dist';
+
+    const moduleRef = await Test.createTestingModule({
+      imports: [
+        ConfigModule.forRoot({ isGlobal: true, validate: validateEnv }),
+        DatabaseModule,
+        SettingsModule,
+        CommonModule,
+      ],
+    }).compile();
+    app = moduleRef.createNestApplication();
+    await app.get(DatabaseInitService).init();
+    const settings = app.get(SettingsService);
+    await settings.set(SETTINGS_KEYS.THEME_KEY, themeKey);
+    svc = app.get(ThemeLoaderService);
+    await svc.onModuleInit();
+  }
+
+  afterEach(async () => {
+    if (app) await app.close();
+  });
+
+  it('exposes all 10 canonical theme ids even when THEMES_DIR is empty', async () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-empty-'));
+    await buildApp(tmp, 'classic');
+    const ids = svc.listThemes().map((t) => t.id).sort();
+    expect(ids).toEqual([
+      'classic', 'crimson', 'cyber', 'forest', 'midnight',
+      'monochrome', 'neon', 'ocean', 'paper', 'sunset',
+    ]);
+    expect(svc.listThemes().length).toBe(THEME_IDS.length);
+  });
+
+  it('backfills missing disk themes with built-ins (per-id warn)', async () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-partial-'));
+    // Only write 3 of the 10 themes to disk.
+    for (const id of ['classic', 'midnight', 'cyber']) {
+      fs.writeFileSync(path.join(tmp, `${id}.json`), JSON.stringify({
+        id,
+        name: id,
+        tokens: {
+          primary: '#000', secondary: '#111', accent: '#222', surface: '#fff', text: '#000',
+          success: '#0f0', warning: '#ff0', danger: '#f00',
+          fontFamily: 'sans', radii: { sm: '1px', md: '2px', lg: '3px' },
+          spacingScale: [4, 8],
+        },
+      }));
+    }
+    await buildApp(tmp, 'classic');
+    expect(svc.listThemes().length).toBe(THEME_IDS.length);
+  });
+
+  it('uses the configured themeKey as default when valid', async () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
+    await buildApp(tmp, 'ocean');
+    expect(svc.getDefaultId()).toBe('ocean');
+    const theme = svc.getTheme('ocean');
+    expect(theme.id).toBe('ocean');
+  });
+
+  it('falls back to classic and warns when configured themeKey is invalid', async () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
+    await buildApp(tmp, 'this-theme-does-not-exist');
+    expect(svc.getDefaultId()).toBe('classic');
+  });
+
+  it('falls back to classic and warns when configured themeKey is empty', async () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
+    await buildApp(tmp, '');
+    expect(svc.getDefaultId()).toBe('classic');
+  });
+
+  it('getTheme() returns a real theme for any canonical id', async () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
+    await buildApp(tmp, 'classic');
+    for (const id of THEME_IDS) {
+      expect(svc.getTheme(id).id).toBe(id);
+    }
+  });
+});

tests/backend/uploads.spec.ts

@@ -0,0 +1,167 @@
+process.env.DATABASE_PATH = ':memory:';
+process.env.THEMES_DIR = './themes';
+process.env.FRONTEND_DIST = './frontend/dist';
+process.env.UPLOAD_DIR = '/tmp/hipctf-uploads-test';
+process.env.UPLOAD_SIZE_LIMIT = '1mb';
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+import { safeFilename, parseUploadSizeLimit } from '../../backend/src/common/utils/upload';
+
+describe('safeFilename', () => {
+  it('strips directory traversal', () => {
+    expect(safeFilename('../../etc/passwd')).not.toMatch(/\.\./);
+    expect(safeFilename('/etc/passwd')).not.toMatch(/^\//);
+  });
+
+  it('lowercases and restricts charset to [a-z0-9._-]', () => {
+    const out = safeFilename('My File (1).TXT');
+    expect(out).toMatch(/^[a-z0-9._-]+$/);
+    expect(out).toMatch(/\.txt$/);
+  });
+
+  it('always returns a non-empty unique name with a random suffix', () => {
+    const a = safeFilename('icon.png');
+    const b = safeFilename('icon.png');
+    expect(a).not.toBe(b);
+    expect(a).toMatch(/^icon-[0-9a-f]{8}\.png$/);
+  });
+
+  it('falls back to "file" when nothing usable is left', () => {
+    expect(safeFilename('///')).toMatch(/^file-[0-9a-f]{8}$/);
+  });
+});
+
+describe('parseUploadSizeLimit', () => {
+  it('parses kb/mb/gb', () => {
+    expect(parseUploadSizeLimit('1kb')).toBe(1024);
+    expect(parseUploadSizeLimit('5mb')).toBe(5 * 1024 * 1024);
+    expect(parseUploadSizeLimit('2gb')).toBe(2 * 1024 * 1024 * 1024);
+    expect(parseUploadSizeLimit('512b')).toBe(512);
+  });
+
+  it('defaults to 50mb on invalid input', () => {
+    expect(parseUploadSizeLimit(undefined)).toBe(50 * 1024 * 1024);
+    expect(parseUploadSizeLimit('garbage')).toBe(50 * 1024 * 1024);
+  });
+});
+
+// Integration: hit the real endpoint via supertest.
+import { Test } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import cookieParser from 'cookie-parser';
+import * as express from 'express';
+import request from 'supertest';
+import { CookieAccessInfo } from 'cookiejar';
+import { AppModule } from '../../backend/src/app.module';
+import { GlobalExceptionFilter } from '../../backend/src/common/filters/global-exception.filter';
+import { CsrfMiddleware } from '../../backend/src/common/middleware/csrf.middleware';
+import { ConfigService } from '@nestjs/config';
+import { initDb } from './db-helper';
+
+describe('Uploads endpoint integration', () => {
+  let app: INestApplication;
+  let adminToken: string;
+
+  beforeAll(async () => {
+    if (fs.existsSync(process.env.UPLOAD_DIR!)) {
+      fs.rmSync(process.env.UPLOAD_DIR!, { recursive: true, force: true });
+    }
+    fs.mkdirSync(process.env.UPLOAD_DIR!, { recursive: true });
+
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile();
+    app = moduleRef.createNestApplication();
+    app.use(cookieParser());
+    app.use(express.json({ limit: '1mb' }));
+    // Mirror production: serve /uploads static so we can verify public fetch.
+    app.use('/uploads', express.static(process.env.UPLOAD_DIR!));
+    const csrfMw = new CsrfMiddleware(app.get(ConfigService));
+    app.use((req: any, res: any, next: any) => csrfMw.use(req, res, next));
+    const httpAdapterHost = app.get(HttpAdapterHost);
+    app.useGlobalFilters(new GlobalExceptionFilter(httpAdapterHost));
+    await app.init();
+    await initDb(app);
+
+    const server = app.getHttpServer();
+    await request(server).post('/api/v1/auth/register-first-admin')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+    const login = await request(server).post('/api/v1/auth/login')
+      .send({ username: 'admin', password: 'Sup3rSecret!Pass' })
+      .expect(201);
+    adminToken = login.body.accessToken;
+  });
+
+  afterAll(async () => {
+    await app.close();
+    if (fs.existsSync(process.env.UPLOAD_DIR!)) {
+      fs.rmSync(process.env.UPLOAD_DIR!, { recursive: true, force: true });
+    }
+  });
+
+  async function primeCsrf(): Promise<{ agent: any; csrf: string }> {
+    const server = app.getHttpServer();
+    const agent = request.agent(server);
+    await agent.get('/api/v1/auth/csrf');
+    const cookies: any = agent.jar.getCookies(CookieAccessInfo.All);
+    return { agent, csrf: cookies.find((c: any) => c.name === 'csrf').value };
+  }
+
+  it('rejects upload without auth (or CSRF)', async () => {
+    const res = await request(app.getHttpServer())
+      .post('/api/v1/uploads/category-icon')
+      .attach('file', Buffer.from('hello'), 'icon.png');
+    // Without a session AND without a CSRF cookie, the CSRF middleware
+    // short-circuits first with 403. Either 401 (auth) or 403 (csrf) is
+    // a valid rejection; the test asserts the upload is rejected.
+    expect([401, 403]).toContain(res.status);
+  });
+
+  it('uploads a small file successfully', async () => {
+    const { agent, csrf } = await primeCsrf();
+    const res = await agent
+      .post('/api/v1/uploads/category-icon')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .set('X-CSRF-Token', csrf)
+      .attach('file', Buffer.from('hello world'), 'icon.png');
+    expect(res.status).toBe(201);
+    expect(res.body.id).toMatch(/^icon-[0-9a-f]{8}\.png$/);
+    expect(res.body.publicUrl).toBe(`/uploads/icons/${res.body.id}`);
+    // File actually written under UPLOAD_DIR/icons
+    const written = path.join(process.env.UPLOAD_DIR!, 'icons', res.body.id);
+    expect(fs.existsSync(written)).toBe(true);
+    // Public-served via /uploads static handler.
+    const fetched = await request(app.getHttpServer()).get(res.body.publicUrl).expect(200);
+    expect(fetched.body?.toString()).toBe('hello world');
+  });
+
+  it('rejects oversize uploads (limit=1mb, file=2mb)', async () => {
+    const { agent, csrf } = await primeCsrf();
+    const big = Buffer.alloc(2 * 1024 * 1024, 'a'); // 2MB
+    const res = await agent
+      .post('/api/v1/uploads/category-icon')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .set('X-CSRF-Token', csrf)
+      .attach('file', big, 'big.bin');
+    // Multer's LIMIT_FILE_SIZE surfaces as 500 by default; we accept 4xx/5xx
+    // and just verify the file was NOT saved.
+    expect([400, 413, 500]).toContain(res.status);
+    const icons = fs.existsSync(path.join(process.env.UPLOAD_DIR!, 'icons'))
+      ? fs.readdirSync(path.join(process.env.UPLOAD_DIR!, 'icons'))
+      : [];
+    expect(icons.some((f) => f === 'big.bin')).toBe(false);
+  });
+
+  it('stores files under per-route subdirectories', async () => {
+    const { agent, csrf } = await primeCsrf();
+    const res = await agent
+      .post('/api/v1/uploads/challenge-file')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .set('X-CSRF-Token', csrf)
+      .attach('file', Buffer.from('attachment'), 'readme.txt');
+    expect(res.status).toBe(201);
+    expect(res.body.publicUrl).toMatch(/^\/uploads\/challenges\//);
+  });
+});