app.js

const path = require('path');
const express = require('express');
const app = express();
const morgan = require('morgan');
const rateLimit = require('express-rate-limit');
const helmet = require('helmet');
const hpp = require('hpp');
const mongoSanitize = require('express-mongo-sanitize');
const xss = require('xss-clean');
// const csp = require('express-csp');
const cookieParser = require('cookie-parser');
const AppError = require('./utils/appError');
const globalErrorHandler = require('./controllers/errorController');
const compression = require('compression');
const cors = require('cors');
// Set up Pug
app.set('view engine', 'pug');
app.set('views', path.join(__dirname, 'views'));


// Import Routers
const viewRouter = require('./routes/viewRoutes');
const userRouter = require('./routes/userRoutes');
const sessionRouter = require('./routes/sessionRoutes');
const playerRouter = require('./routes/playerRoutes');
const reviewRouter = require('./routes/reviewRoutes');
const bookingRouter = require('./routes/bookingRoutes');
const bookingController = require('./controllers/bookingController');


// MIDDLEWARE

// Serving static files
app.use(express.static(path.join(__dirname, '/public')));

app.enable('trust proxy');

app.use(cors());

// Allow PATCH, PUT and other non-simple requests
// app.options('*', cors());

// To allow complex requests at only specific URLS
// app.options('/api/v1/sessions/:id', cors());

// Example Use Case for only allowing certain URLs to access API
// API at api.literallypossible.io with xlnona trying to access
app.use(cors({
  origin: 'https://www.xlnona.com',
  credentials: true,
  headers:['Content-Length', 'Content-Type', 'Authorization']
}));

// Security HTTP headers
app.use(
  helmet({
    contentSecurityPolicy: {
      directives: {
        defaultSrc: ["'self'", 'data:', 'blob:', 'https:', 'ws:'],
        baseUri: ["'self'"],
        fontSrc: ["'self'", 'https:', 'data:'],
        scriptSrc: [
          "'self'",
          'https:',
          'http:',
          'blob:',
          'https://*.mapbox.com',
          'https://js.stripe.com',
          'https://m.stripe.network',
          'https://*.cloudflare.com',
        ],
        frameSrc: ["'self'", 'https://js.stripe.com'],
        objectSrc: ["'none'"],
        styleSrc: ["'self'", 'https:', "'unsafe-inline'"],
        workerSrc: [
          "'self'",
          'data:',
          'blob:',
          'https://*.tiles.mapbox.com',
          'https://api.mapbox.com',
          'https://events.mapbox.com',
          'https://m.stripe.network',
        ],
        childSrc: ["'self'", 'blob:'],
        imgSrc: ["'self'", 'data:', 'blob:'],
        formAction: ["'self'"],
        connectSrc: [
          "'self'",
          "'unsafe-inline'",
          'data:',
          'blob:',
          'https://*.stripe.com',
          'https://*.mapbox.com',
          'https://*.cloudflare.com/',
          'https://bundle.js:*',
          'ws://127.0.0.1:*/',
          'http://127.0.0.1:*/'
 
        ],
        upgradeInsecureRequests: [],
      },
    },
  })
);

app.use(function (req, res, next) {
  res.setHeader("Access-Control-Allow-Origin", "*");
  res.setHeader("Access-Control-Allow-Credentials", "true");
  res.setHeader("Access-Control-Allow-Methods", "GET,HEAD,OPTIONS,POST,PUT");
  res.setHeader("Access-Control-Allow-Headers", "Access-Control-Allow-Headers, Origin,Accept, X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers, Authorization");
  next();
});

if(process.env.NODE_ENV === 'development') {
    app.use(morgan('dev'));
}

// Body parser, reading data from body into req.body
app.use(express.json({ limit: '10kb' }));
app.use(cookieParser());

// Data Sanitization against NoSQL query injejction
app.use(mongoSanitize());

// Data Sanitization against XSS
app.use(xss());

// Prevent Parameter Pollution
app.use(
    hpp({
        whitelist: [
            'price',
            'priceDiscount',
            'birthYear',
            'startDates',
            'endDate',
            'trainer',
            'staffOnly',
            'sport',
            'demo'
        ]
    })
);

app.use(compression())

// Test Middleware
app.use((req, res, next) => {
    req.requestTime = new Date().toISOString();
    next();
});

// Limit Requests from same IP
const limiter = rateLimit({
    max: 100,
    windowMs: 60 * 60 * 1000,
    message: 'Too many requests from this IP, please try again after one hour' 
});

app.use('/api', limiter);

// app.post('/webhook-checkout', express.raw({type: 'application/json'}), bookingController.webhookCheckout);

// Mount Routes
app.use('/', viewRouter);
app.use('/api/v1/users', userRouter);
app.use('/api/v1/sessions', sessionRouter);
app.use('/api/v1/players', playerRouter);
app.use('/api/v1/reviews', reviewRouter);
app.use('/api/v1/booking', bookingRouter);

// Error handling for bad routes
app.all('*', (req, res, next) => {
    next(new AppError(`Can't find ${req.originalUrl} on this server`));
});

// 4 parameters signals that this is error handling middleware
app.use(globalErrorHandler);

module.exports = app;