HackMD/app.js

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'use strict'
// app
// external modules
var express = require('express')
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var ejs = require('ejs')
var passport = require('passport')
var methodOverride = require('method-override')
var cookieParser = require('cookie-parser')
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var compression = require('compression')
var session = require('express-session')
var SequelizeStore = require('connect-session-sequelize')(session.Store)
var fs = require('fs')
var path = require('path')
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var morgan = require('morgan')
var passportSocketIo = require('passport.socketio')
var helmet = require('helmet')
var i18n = require('i18n')
var flash = require('connect-flash')
// core
var config = require('./lib/config')
var logger = require('./lib/logger')
var response = require('./lib/response')
var models = require('./lib/models')
var csp = require('./lib/csp')
// server setup
var app = express()
var server = null
if (config.useSSL) {
var ca = (function () {
var i, len, results
results = []
for (i = 0, len = config.sslCAPath.length; i < len; i++) {
results.push(fs.readFileSync(config.sslCAPath[i], 'utf8'))
}
return results
})()
var options = {
key: fs.readFileSync(config.sslKeyPath, 'utf8'),
cert: fs.readFileSync(config.sslCertPath, 'utf8'),
ca: ca,
dhparam: fs.readFileSync(config.dhParamPath, 'utf8'),
requestCert: false,
rejectUnauthorized: false
}
server = require('https').createServer(options, app)
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} else {
server = require('http').createServer(app)
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}
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// logger
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app.use(morgan('combined', {
'stream': logger
}))
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// socket io
var io = require('socket.io')(server)
io.engine.ws = new (require('ws').Server)({
noServer: true,
perMessageDeflate: false
})
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// others
var realtime = require('./lib/realtime.js')
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// assign socket io to realtime
realtime.io = io
// methodOverride
app.use(methodOverride('_method'))
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// session store
var sessionStore = new SequelizeStore({
db: models.sequelize
})
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// compression
app.use(compression())
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// use hsts to tell https users stick to this
if (config.hsts.enable) {
app.use(helmet.hsts({
maxAge: config.hsts.maxAgeSeconds * 1000,
includeSubdomains: config.hsts.includeSubdomains,
preload: config.hsts.preload
}))
} else if (config.useSSL) {
logger.info('Consider enabling HSTS for extra security:')
logger.info('https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security')
}
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// Add referrer policy to improve privacy
app.use(
helmet.referrerPolicy({
policy: 'same-origin'
})
)
// Generate a random nonce per request, for CSP with inline scripts
app.use(csp.addNonceToLocals)
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// use Content-Security-Policy to limit XSS, dangerous plugins, etc.
// https://helmetjs.github.io/docs/csp/
if (config.csp.enable) {
app.use(helmet.contentSecurityPolicy({
directives: csp.computeDirectives()
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}))
} else {
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logger.info('Content-Security-Policy is disabled. This may be a security risk.')
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}
i18n.configure({
locales: ['en', 'zh-CN', 'zh-TW', 'fr', 'de', 'ja', 'es', 'ca', 'el', 'pt', 'it', 'tr', 'ru', 'nl', 'hr', 'pl', 'uk', 'hi', 'sv', 'eo', 'da', 'ko', 'id'],
cookie: 'locale',
directory: path.join(__dirname, '/locales'),
updateFiles: config.updateI18nFiles
})
app.use(cookieParser())
app.use(i18n.init)
// routes without sessions
// static files
app.use('/', express.static(path.join(__dirname, '/public'), { maxAge: config.staticCacheTime }))
app.use('/docs', express.static(path.resolve(__dirname, config.docsPath), { maxAge: config.staticCacheTime }))
app.use('/uploads', express.static(path.resolve(__dirname, config.uploadsPath), { maxAge: config.staticCacheTime }))
app.use('/default.md', express.static(path.resolve(__dirname, config.defaultNotePath), { maxAge: config.staticCacheTime }))
// session
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app.use(session({
name: config.sessionName,
secret: config.sessionSecret,
resave: false, // don't save session if unmodified
saveUninitialized: true, // always create session to ensure the origin
rolling: true, // reset maxAge on every response
cookie: {
maxAge: config.sessionLife
},
store: sessionStore
}))
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// session resumption
var tlsSessionStore = {}
server.on('newSession', function (id, data, cb) {
tlsSessionStore[id.toString('hex')] = data
cb()
})
server.on('resumeSession', function (id, cb) {
cb(null, tlsSessionStore[id.toString('hex')] || null)
})
// middleware which blocks requests when we're too busy
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app.use(require('./lib/web/middleware/tooBusy'))
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app.use(flash())
// passport
app.use(passport.initialize())
app.use(passport.session())
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// check uri is valid before going further
app.use(require('./lib/web/middleware/checkURIValid'))
// redirect url without trailing slashes
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app.use(require('./lib/web/middleware/redirectWithoutTrailingSlashes'))
app.use(require('./lib/web/middleware/codiMDVersion'))
// routes need sessions
// template files
app.set('views', config.viewPath)
// set render engine
app.engine('ejs', ejs.renderFile)
// set view engine
app.set('view engine', 'ejs')
app.use(require('./lib/web/baseRouter'))
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app.use(require('./lib/web/statusRouter'))
app.use(require('./lib/web/auth'))
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app.use(require('./lib/web/historyRouter'))
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app.use(require('./lib/web/userRouter'))
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app.use(require('./lib/web/imageRouter'))
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app.use(require('./lib/web/noteRouter'))
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// response not found if no any route matxches
app.get('*', function (req, res) {
response.errorNotFound(res)
})
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// socket.io secure
io.use(realtime.secure)
// socket.io auth
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io.use(passportSocketIo.authorize({
cookieParser: cookieParser,
key: config.sessionName,
secret: config.sessionSecret,
store: sessionStore,
success: realtime.onAuthorizeSuccess,
fail: realtime.onAuthorizeFail
}))
// socket.io heartbeat
io.set('heartbeat interval', config.heartbeatInterval)
io.set('heartbeat timeout', config.heartbeatTimeout)
// socket.io connection
io.sockets.on('connection', realtime.connection)
// listen
function startListen () {
var address
var listenCallback = function () {
var schema = config.useSSL ? 'HTTPS' : 'HTTP'
logger.info('%s Server listening at %s', schema, address)
realtime.maintenance = false
}
// use unix domain socket if 'path' is specified
if (config.path) {
address = config.path
server.listen(config.path, listenCallback)
} else {
address = config.host + ':' + config.port
server.listen(config.port, config.host, listenCallback)
}
}
// sync db then start listen
models.sequelize.sync().then(function () {
// check if realtime is ready
if (realtime.isReady()) {
models.Revision.checkAllNotesRevision(function (err, notes) {
if (err) throw new Error(err)
if (!notes || notes.length <= 0) return startListen()
})
} else {
throw new Error('server still not ready after db synced')
}
})
// log uncaught exception
process.on('uncaughtException', function (err) {
logger.error('An uncaught exception has occured.')
logger.error(err)
logger.error('Process will exit now.')
process.exit(1)
})
// install exit handler
function handleTermSignals () {
logger.info('CodiMD has been killed by signal, try to exit gracefully...')
realtime.maintenance = true
// disconnect all socket.io clients
Object.keys(io.sockets.sockets).forEach(function (key) {
var socket = io.sockets.sockets[key]
// notify client server going into maintenance status
socket.emit('maintenance')
setTimeout(function () {
socket.disconnect(true)
}, 0)
})
var checkCleanTimer = setInterval(function () {
if (realtime.isReady()) {
models.Revision.checkAllNotesRevision(function (err, notes) {
if (err) return logger.error(err)
if (!notes || notes.length <= 0) {
clearInterval(checkCleanTimer)
return process.exit(0)
}
})
}
}, 100)
}
process.on('SIGINT', handleTermSignals)
process.on('SIGTERM', handleTermSignals)
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process.on('SIGQUIT', handleTermSignals)