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app.js
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app.js
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'use strict';
const path = require('path');
const express = require('express');
const mime = require('mime');
const semver = require('semver');
const { v4: uuidv4 } = require('uuid');
// constants
const ENV = process.env;
const NODE_ENV = ENV.NODE_ENV || 'development';
const PUBLIC_DIR = path.join(__dirname, 'public');
const customMime = mime.define({
'text/javascript': ['js']
}, true);
const STATIC_OPTS = {
maxAge: '1y',
lastModified: true,
etag: false,
mime: customMime
};
// middleware
const compression = require('compression');
const favicon = require('serve-favicon');
const logger = require('morgan');
const errorHandler = require('errorhandler');
const enforce = require('express-sslify');
const sitemap = require('express-sitemap');
const helmet = require('helmet');
const staticify = require('staticify')(PUBLIC_DIR, {
sendOptions: STATIC_OPTS
});
const config = require('./config');
const CSP = require('./config/helmet-csp');
const helpers = require('./lib/helpers');
const routes = require('./routes');
const app = express();
// all environments
app.set('views', path.join(__dirname, '/views/'));
app.set('view engine', 'pug');
app.set('etag', false);
app.set('json escape', true);
app.set('json spaces', 2);
app.set('x-powered-by', false);
/* istanbul ignore if */
if (NODE_ENV === 'production') {
// production
app.use(logger('combined'));
if (ENV.FORCE_SSL === 'true') {
// Because this is (always) going to break local, I'm requiring a secondary
// environment variable to be enabled to activate it. This is required in
// app.json to ensure that it's always set when building out the app on
// Heroku.
app.use(enforce.HTTPS({ trustProtoHeader: true }));
}
} else {
// development
app.locals.pretty = true;
app.use(logger('dev'));
app.use(errorHandler({
dumpExceptions: true,
showStack: true
}));
}
// middleware
app.use(compression());
app.use(staticify.middleware);
app.use(favicon(path.join(PUBLIC_DIR, config.app.favicon.uri), '7d'));
app.use((req, res, next) => {
// Create a nonce for use with CSP;
// get a random UUID and convert it to a base64 string
const nonce = Buffer.from(uuidv4(), 'utf-8').toString('base64');
// make config available in routes
req.config = config;
// custom headers
res.setHeader('Cache-Control', 'public, max-age=0, must-revalidate');
res.setHeader('X-Hello-Human', 'Say hello back! @getBootstrapCDN on Twitter');
res.setHeader('X-Powered-By', 'StackPath');
res.locals.nonce = nonce;
next();
});
app.use(express.static(PUBLIC_DIR, STATIC_OPTS));
app.use(helmet({
dnsPrefetchControl: false,
frameguard: {
action: 'deny'
}
}));
app.use(helmet.hsts({
force: true,
includeSubDomains: true,
maxAge: 63072000, // 2 years
preload: true
}));
app.use(helmet.referrerPolicy({ policy: 'strict-origin-when-cross-origin' }));
app.use(helmet.contentSecurityPolicy({
directives: CSP,
// Set to false if you want to completely disable any user-agent sniffing.
// This may make the headers less compatible but it will be much faster.
// This defaults to `true`.
browserSniff: false
}));
// locals
app.locals.helpers = helpers;
app.locals.config = config;
app.locals.basedir = PUBLIC_DIR;
app.locals.getVersionedPath = staticify.getVersionedPath;
app.locals.semver = semver;
// routes
app.use('/', routes.indexRoute);
app.use('/about/', routes.aboutRoute);
app.use('/alpha/?|/beta/?', routes.redirectToRoot);
app.use('/books/', routes.booksRoute);
app.use('/bootlint/', routes.bootlintRoute);
app.use('/bootswatch/', routes.bootswatchRoute);
app.use('/bootswatch4/', routes.bootswatch4Route);
app.use('/data/bootstrapcdn.json', routes.dataRoute);
app.use('/fontawesome/', routes.fontawesomeRoute);
app.use('/integrations/', routes.integrationsRoute);
app.use('/jobs/', routes.jobsRoute);
app.use('/legacy', routes.legacyRoutes);
app.use('/privacy-policy/', routes.privacyPolicyRoute);
app.use('/showcase/', routes.showcaseRoute);
app.use('/themes/', routes.themesRoute);
const map = sitemap({
url: 'www.bootstrapcdn.com',
http: 'https',
sitemapSubmission: '/sitemap.xml',
cache: 60000, // enable 1m cache
route: { // custom route
'/': {
disallow: !ENV.ENABLE_CRAWLING
},
'/data/bootstrapcdn.json': {
hide: true // exclude this route from xml and txt
},
'/404/': {
hide: true
},
'/books/': {
hide: true
},
'/bootswatch4/': {
hide: true
},
'/jobs/': {
hide: true
},
'/legacy/': {
hide: true
},
'/robots.txt': {
hide: true
},
'/sitemap.xml': {
hide: true
},
'/themes/': {
hide: true
}
}
});
/* istanbul ignore if */
if (ENV.ENABLE_CRAWLING) {
app.get('/sitemap.xml', (req, res) => {
map.generate4(app, [
'/',
'/about',
'/bootlint',
'/bootswatch',
'/fontawesome',
'/integrations',
'/legacy',
'/privacy-policy',
'/showcase'
]);
return map.XMLtoWeb(res);
});
}
app.get('/robots.txt', (req, res) => map.TXTtoWeb(res));
app.use('*', routes.notFoundRoute);
module.exports = app;
// vim: ft=javascript sw=4 sts=4 et: