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app.js
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app.js
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require('dotenv').config();
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
// Security dependencies
const helmet = require('helmet');
const compression = require('compression');
const bodyParser = require('body-parser');
const rateLimit = require('express-rate-limit');
var indexRouter = require('./routes/index');
var app = express();
// Setup helmet middleware
app.use(helmet({
contentSecurityPolicy: {
directives: {
...helmet.contentSecurityPolicy.getDefaultDirectives(),
"img-src": ["'self'", "data:", "https:"],
"script-src": ["'self'", "https:"]
}
}
}));
// Compress responses
app.use(compression());
// Setup body-parser middleware
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json({ limit: '100kb' }));
// Setup express-rate-limit
app.set('trust proxy', 1); // Reverse proxy (Heroku)
const limiter = rateLimit({
windowMS: 1000 * 60 * 10, // 10 min in ms
max: 50, // Max requests per 10 min window
message: 'You have exceeded the 50 requests in 10 minutes limit!',
headers: true // Send the appropriate headers to the response (X-RateLimit-Limit, X-RateLimit-Remaining, Retry-After)
});
app.use(limiter);
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;