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index.js
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index.js
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module.exports = Site
var bodyParser = require('body-parser')
var compression = require('compression')
var connectMongo = require('connect-mongo')
var connectSlashes = require('connect-slashes')
var cookieParser = require('cookie-parser')
var csrf = require('csurf')
var debug = require('debug')('studynotes:site')
var express = require('express')
var favicon = require('serve-favicon')
var flash = require('connect-flash')
var http = require('http')
var pug = require('pug')
var moment = require('moment')
var nib = require('nib')
var parallel = require('run-parallel')
var passport = require('passport')
var path = require('path')
var session = require('express-session')
var stylus = require('stylus')
var supportsColor = require('supports-color')
var url = require('url')
var useragent = require('useragent')
var auth = require('./lib/auth')
var config = require('./config')
var model = require('./model')
var pro = require('./lib/pro')
var routes = require('./routes')
var run = require('./run')
var secret = require('./secret')
var util = require('./util')
pug.filters.style = function (str) {
var ret
stylus(str, { compress: config.isProd })
.use(nib())
.render(function (err, css) { // sync
if (err) throw err
ret = css
})
return '<style>' + ret + '</style>'
}
function Site (opts, done) {
var self = this
if (!(self instanceof Site)) return new Site(opts, done)
self.port = opts.port || 4000
self.debug('started')
self.app = express()
self.server = http.createServer(self.app)
// Trust "X-Forwarded-For" and "X-Forwarded-Proto" nginx headers
self.app.enable('trust proxy')
// Disable "powered by express" header
self.app.disable('x-powered-by')
// Use Pug for templates
self.app.set('views', path.join(__dirname, 'views'))
self.app.set('view engine', 'pug')
self.app.engine('pug', pug.renderFile)
// Make some variables and functions available to Pug templates
self.app.locals.config = config
self.app.locals.modelCache = model.cache
self.app.locals.moment = moment
self.app.locals.pretty = !config.isProd // minify html
self.app.locals.util = util
self.app.use(compression()) // gzip
self.setupHeaders()
self.setupStatic()
self.app.use(connectSlashes()) // append trailing slash
self.setupLogger()
self.setupLocals()
self.setupSessions()
self.app.use(pro.checkPro)
self.app.use(flash()) // errors are propogated using `req.flash`
parallel([
model.connect,
function (cb) {
self.server.listen(self.port, cb)
}
], function (err) {
if (err) return done(err)
routes(self.app)
self.debug('listening on ' + self.port)
done(null)
})
}
Site.prototype.setupHeaders = function () {
var self = this
self.app.use(function (req, res, next) {
var extname = path.extname(url.parse(req.url).pathname) // eslint-disable-line node/no-deprecated-api
// Add cross-domain header for fonts, required by spec, Firefox, and IE.
if (['.eot', '.ttf', '.otf', '.woff', '.woff2'].indexOf(extname) >= 0) {
res.header('Access-Control-Allow-Origin', '*')
}
// Prevents IE and Chrome from MIME-sniffing a response to reduce exposure to
// drive-by download attacks when serving user uploaded content.
res.header('X-Content-Type-Options', 'nosniff')
// Prevent rendering of site within a frame
res.header('X-Frame-Options', 'DENY')
// Enable the XSS filter built into most recent web browsers. It's usually
// enabled by default anyway, so role of this headers is to re-enable for this
// particular website if it was disabled by the user.
res.header('X-XSS-Protection', '1; mode=block')
// Force IE to use latest rendering engine or Chrome Frame
res.header('X-UA-Compatible', 'IE=Edge,chrome=1')
if (config.isProd) {
// Use HTTP Strict Transport Security
// Lasts 1 year, incl. subdomains, allow browser preload list
res.header(
'Strict-Transport-Security',
'max-age=31536000; includeSubDomains; preload'
)
// Redirect to main site url, over https
if (req.method === 'GET' &&
(req.protocol !== 'https' || req.hostname !== 'www.apstudynotes.org')) {
self.debug('Redirect to canonical url: %s', req.hostname + req.url)
return res.redirect(301, config.siteOrigin + req.url)
}
}
next()
})
}
Site.prototype.setupStatic = function () {
var self = this
// Favicon middleware makes favicon requests fast
self.app.use(favicon(path.join(config.root, 'static/favicon.ico')))
// Serve static files
var opts = {
maxAge: config.maxAge
}
var stat = express.static(config.root + '/static', opts)
var out = express.static(config.root + '/out', opts)
var vendor = express.static(config.root + '/vendor', opts)
self.app.use(stat)
self.app.use(out)
self.app.use(vendor)
// HACK: Make CSS relative URLs work in development
if (!config.isProd) {
self.app.use(express.static(config.root + '/vendor/select2', opts))
self.app.use('/font', express.static(config.root + '/vendor/fontello/font', opts))
}
}
Site.prototype.setupLogger = function () {
var self = this
self.app.use(function (req, res, next) {
// Log requests using the "debug" module so that the output is hidden by default.
// Enable with DEBUG=* environment variable.
self.debug(
(supportsColor.stderr ? '\x1B[90m' : '') +
req.method + ' ' + req.originalUrl + ' ' + req.ip +
(supportsColor.stderr ? '\x1B[0m' : '')
)
next()
})
}
Site.prototype.setupSessions = function () {
var self = this
self.app.use(cookieParser(secret.cookieSecret))
// parse application/x-www-form-urlencoded
self.app.use(bodyParser.urlencoded({ extended: false }))
// parse application/json
self.app.use(bodyParser.json())
var MongoStore = connectMongo(session)
self.app.use(session({
proxy: true, // trust the reverse proxy
resave: false, // don't save if session is unmodified
saveUninitialized: false, // don't save new/unmodified sessions
secret: secret.cookieSecret, // prevent cookie tampering
store: new MongoStore({
url: 'mongodb://' +
secret.mongo.host + ':' +
secret.mongo.port + '/' +
secret.mongo.database
})
}))
self.app.use(csrf())
self.app.use(function (req, res, next) {
res.locals.csrf = req.csrfToken()
next()
})
// Passport
self.app.use(passport.initialize())
self.app.use(passport.session())
passport.serializeUser(auth.serializeUser)
passport.deserializeUser(auth.deserializeUser)
passport.use(auth.passportStrategy)
}
Site.prototype.setupLocals = function () {
var self = this
var mobileFamilies = [
'amazon-silk',
'android',
'blackberry-webkit',
'chrome-mobile',
'ie-mobile',
'mobile-safari',
'nokia-browser'
]
var adBlock = [
'136.24.8.53',
'136.24.8.157',
'67.161.169.40',
'73.151.205.54'
]
// Never show ads on urls that start with the following patterns
var ignoreUrls = [
'/about/',
'/advertise/',
'/contact/',
'/essay-review/',
'/login/',
'/open-source/',
'/photo-credits/',
'/plagiarism/',
'/privacy/',
'/pro/',
'/signup/',
'/stats/',
'/terms/',
'/testimonials/'
]
self.app.use(function (req, res, next) {
var agent = useragent.lookup(req.headers['user-agent'])
req.agent = agent.family.replace(/ /g, '-').toLowerCase()
if (mobileFamilies.indexOf(req.agent) >= 0) {
req.agent += ' mobile'
req.mobile = true
}
res.locals.req = req
var isIgnoreUrl = ignoreUrls.some(ignoreUrl => req.url.startsWith(ignoreUrl))
res.locals.ads = Boolean(req.query.ads) ||
(adBlock.indexOf(req.ip) === -1 && !isIgnoreUrl)
next()
})
}
Site.prototype.debug = function () {
var args = [].slice.call(arguments)
debug.apply(null, args)
}
if (!module.parent) run(Site)