HackMD/app.js

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// app
// external modules
var express = require('express')
var toobusy = require('toobusy-js')
var ejs = require('ejs')
var passport = require('passport')
var methodOverride = require('method-override')
var cookieParser = require('cookie-parser')
var bodyParser = require('body-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 url = require('url')
var path = require('path')
var imgur = require('imgur')
var formidable = require('formidable')
var morgan = require('morgan')
var passportSocketIo = require('passport.socketio')
var helmet = require('helmet')
var i18n = require('i18n')
var flash = require('connect-flash')
var validator = require('validator')
// core
var config = require('./lib/config.js')
var logger = require('./lib/logger.js')
var auth = require('./lib/auth.js')
var response = require('./lib/response.js')
var models = require('./lib/models')
// generate front-end constants by template
var constpath = path.join(__dirname, './public/js/lib/common/constant.ejs')
var data = {
domain: config.domain,
urlpath: config.urlpath,
debug: config.debug,
version: config.version,
GOOGLE_API_KEY: config.google ? config.google.GOOGLE_API_KEY : '',
GOOGLE_CLIENT_ID: config.google ? config.google.GOOGLE_CLIENT_ID : '',
DROPBOX_APP_KEY: config.dropbox ? config.dropbox.DROPBOX_APP_KEY : ''
}
ejs.renderFile(constpath, data, {}, function (err, str) {
if (err) throw new Error(err)
fs.writeFileSync(path.join(__dirname, './public/build/constant.js'), str)
})
// server setup
var app = express()
var server = null
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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.stream
}))
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// socket io
var io = require('socket.io')(server)
io.engine.ws = new (require('uws').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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// create application/x-www-form-urlencoded parser
var urlencodedParser = bodyParser.urlencoded({
extended: false,
limit: 1024 * 1024 * 10 // 10 mb
})
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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
app.use(helmet.hsts({
maxAge: 31536000 * 1000, // 365 days
includeSubdomains: true,
preload: true
}))
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i18n.configure({
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locales: ['en', 'zh', 'fr', 'de', 'ja', 'es', 'ca', 'el', 'pt', 'it', 'tr', 'ru', 'nl', 'hr', 'pl', 'uk', 'hi', 'sv', 'eo'],
cookie: 'locale',
directory: path.join(__dirname, '/locales')
})
app.use(cookieParser())
app.use(i18n.init)
// routes without sessions
// static files
app.use('/', express.static(path.join(__dirname, '/public'), { 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(function (req, res, next) {
if (toobusy()) {
response.errorServiceUnavailable(res)
} else {
next()
}
})
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app.use(flash())
// passport
app.use(passport.initialize())
app.use(passport.session())
auth.registerAuthMethod()
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// serialize and deserialize
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passport.serializeUser(function (user, done) {
logger.info('serializeUser: ' + user.id)
return done(null, user.id)
})
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passport.deserializeUser(function (id, done) {
models.User.findOne({
where: {
id: id
}
}).then(function (user) {
logger.info('deserializeUser: ' + user.id)
return done(null, user)
}).catch(function (err) {
logger.error(err)
return done(err, null)
})
})
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// check uri is valid before going further
app.use(function (req, res, next) {
try {
decodeURIComponent(req.path)
} catch (err) {
logger.error(err)
return response.errorBadRequest(res)
}
next()
})
// redirect url without trailing slashes
app.use(function (req, res, next) {
if (req.method === 'GET' && req.path.substr(-1) === '/' && req.path.length > 1) {
var query = req.url.slice(req.path.length)
var urlpath = req.path.slice(0, -1)
var serverurl = config.serverurl
if (config.urlpath) serverurl = serverurl.slice(0, -(config.urlpath.length + 1))
res.redirect(301, serverurl + urlpath + query)
} else {
next()
}
})
// routes need sessions
// template files
app.set('views', path.join(__dirname, '/public/views'))
// set render engine
app.engine('ejs', ejs.renderFile)
// set view engine
app.set('view engine', 'ejs')
// get index
app.get('/', response.showIndex)
// get 403 forbidden
app.get('/403', function (req, res) {
response.errorForbidden(res)
})
// get 404 not found
app.get('/404', function (req, res) {
response.errorNotFound(res)
})
// get 500 internal error
app.get('/500', function (req, res) {
response.errorInternalError(res)
})
// get status
app.get('/status', function (req, res, next) {
realtime.getStatus(function (data) {
res.set({
'Cache-Control': 'private', // only cache by client
'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
})
res.send(data)
})
})
// get status
app.get('/temp', function (req, res) {
var host = req.get('host')
if (config.alloworigin.indexOf(host) === -1) {
response.errorForbidden(res)
} else {
var tempid = req.query.tempid
if (!tempid) {
response.errorForbidden(res)
} else {
models.Temp.findOne({
where: {
id: tempid
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}
}).then(function (temp) {
if (!temp) {
response.errorNotFound(res)
} else {
res.header('Access-Control-Allow-Origin', '*')
res.send({
temp: temp.data
})
temp.destroy().catch(function (err) {
if (err) {
logger.error('remove temp failed: ' + err)
}
})
}
}).catch(function (err) {
logger.error(err)
return response.errorInternalError(res)
})
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}
}
})
// post status
app.post('/temp', urlencodedParser, function (req, res) {
var host = req.get('host')
if (config.alloworigin.indexOf(host) === -1) {
response.errorForbidden(res)
} else {
var data = req.body.data
if (!data) {
response.errorForbidden(res)
} else {
if (config.debug) {
logger.info('SERVER received temp from [' + host + ']: ' + req.body.data)
}
models.Temp.create({
data: data
}).then(function (temp) {
if (temp) {
res.header('Access-Control-Allow-Origin', '*')
res.send({
status: 'ok',
id: temp.id
})
} else {
response.errorInternalError(res)
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}
}).catch(function (err) {
logger.error(err)
return response.errorInternalError(res)
})
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}
}
})
function setReturnToFromReferer (req) {
var referer = req.get('referer')
if (!req.session) req.session = {}
req.session.returnTo = referer
}
// facebook auth
if (config.facebook) {
app.get('/auth/facebook', function (req, res, next) {
setReturnToFromReferer(req)
passport.authenticate('facebook')(req, res, next)
})
// facebook auth callback
app.get('/auth/facebook/callback',
passport.authenticate('facebook', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/'
}))
}
// twitter auth
if (config.twitter) {
app.get('/auth/twitter', function (req, res, next) {
setReturnToFromReferer(req)
passport.authenticate('twitter')(req, res, next)
})
// twitter auth callback
app.get('/auth/twitter/callback',
passport.authenticate('twitter', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/'
}))
}
// github auth
if (config.github) {
app.get('/auth/github', function (req, res, next) {
setReturnToFromReferer(req)
passport.authenticate('github')(req, res, next)
})
// github auth callback
app.get('/auth/github/callback',
passport.authenticate('github', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/'
}))
if (!config.gitlab.scope || config.gitlab.scope === 'api') {
// gitlab callback actions
app.get('/auth/gitlab/callback/:noteId/:action', response.gitlabActions)
}
}
// gitlab auth
if (config.gitlab) {
app.get('/auth/gitlab', function (req, res, next) {
setReturnToFromReferer(req)
passport.authenticate('gitlab')(req, res, next)
})
// gitlab auth callback
app.get('/auth/gitlab/callback',
passport.authenticate('gitlab', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/'
}))
// gitlab callback actions
app.get('/auth/gitlab/callback/:noteId/:action', response.gitlabActions)
}
// dropbox auth
if (config.dropbox) {
app.get('/auth/dropbox', function (req, res, next) {
setReturnToFromReferer(req)
passport.authenticate('dropbox-oauth2')(req, res, next)
})
// dropbox auth callback
app.get('/auth/dropbox/callback',
passport.authenticate('dropbox-oauth2', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/'
}))
}
// google auth
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if (config.google) {
app.get('/auth/google', function (req, res, next) {
setReturnToFromReferer(req)
passport.authenticate('google', { scope: ['profile'] })(req, res, next)
})
// google auth callback
app.get('/auth/google/callback',
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passport.authenticate('google', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/'
}))
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}
// ldap auth
if (config.ldap) {
app.post('/auth/ldap', urlencodedParser, function (req, res, next) {
if (!req.body.username || !req.body.password) return response.errorBadRequest(res)
setReturnToFromReferer(req)
passport.authenticate('ldapauth', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/',
failureFlash: true
})(req, res, next)
})
}
// email auth
if (config.email) {
if (config.allowemailregister) {
app.post('/register', urlencodedParser, function (req, res, next) {
if (!req.body.email || !req.body.password) return response.errorBadRequest(res)
if (!validator.isEmail(req.body.email)) return response.errorBadRequest(res)
models.User.findOrCreate({
where: {
email: req.body.email
},
defaults: {
password: req.body.password
}
}).spread(function (user, created) {
if (user) {
if (created) {
if (config.debug) {
logger.info('user registered: ' + user.id)
}
req.flash('info', "You've successfully registered, please signin.")
} else {
if (config.debug) {
logger.info('user found: ' + user.id)
}
req.flash('error', 'This email has been used, please try another one.')
}
return res.redirect(config.serverurl + '/')
}
req.flash('error', 'Failed to register your account, please try again.')
return res.redirect(config.serverurl + '/')
}).catch(function (err) {
logger.error('auth callback failed: ' + err)
return response.errorInternalError(res)
})
})
}
app.post('/login', urlencodedParser, function (req, res, next) {
if (!req.body.email || !req.body.password) return response.errorBadRequest(res)
if (!validator.isEmail(req.body.email)) return response.errorBadRequest(res)
setReturnToFromReferer(req)
passport.authenticate('local', {
successReturnToOrRedirect: config.serverurl + '/',
failureRedirect: config.serverurl + '/',
failureFlash: 'Invalid email or password.'
})(req, res, next)
})
}
// logout
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app.get('/logout', function (req, res) {
if (config.debug && req.isAuthenticated()) { logger.info('user logout: ' + req.user.id) }
req.logout()
res.redirect(config.serverurl + '/')
})
var history = require('./lib/history.js')
// get history
app.get('/history', history.historyGet)
// post history
app.post('/history', urlencodedParser, history.historyPost)
// post history by note id
app.post('/history/:noteId', urlencodedParser, history.historyPost)
// delete history
app.delete('/history', history.historyDelete)
// delete history by note id
app.delete('/history/:noteId', history.historyDelete)
// get me info
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app.get('/me', function (req, res) {
if (req.isAuthenticated()) {
models.User.findOne({
where: {
id: req.user.id
}
}).then(function (user) {
if (!user) { return response.errorNotFound(res) }
var profile = models.User.getProfile(user)
res.send({
status: 'ok',
id: req.user.id,
name: profile.name,
photo: profile.photo
})
}).catch(function (err) {
logger.error('read me failed: ' + err)
return response.errorInternalError(res)
})
} else {
res.send({
status: 'forbidden'
})
}
})
// upload image
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app.post('/uploadimage', function (req, res) {
var form = new formidable.IncomingForm()
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form.keepExtensions = true
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if (config.imageUploadType === 'filesystem') {
form.uploadDir = 'public/uploads'
}
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form.parse(req, function (err, fields, files) {
if (err || !files.image || !files.image.path) {
response.errorForbidden(res)
} else {
if (config.debug) { logger.info('SERVER received uploadimage: ' + JSON.stringify(files.image)) }
try {
switch (config.imageUploadType) {
case 'filesystem':
res.send({
link: url.resolve(config.serverurl + '/', files.image.path.match(/^public\/(.+$)/)[1])
})
break
case 's3':
var AWS = require('aws-sdk')
var awsConfig = new AWS.Config(config.s3)
var s3 = new AWS.S3(awsConfig)
fs.readFile(files.image.path, function (err, buffer) {
if (err) {
logger.error(err)
res.status(500).end('upload image error')
return
}
var params = {
Bucket: config.s3bucket,
Key: path.join('uploads', path.basename(files.image.path)),
Body: buffer
}
s3.putObject(params, function (err, data) {
if (err) {
logger.error(err)
res.status(500).end('upload image error')
return
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}
res.send({
link: `https://s3-${config.s3.region}.amazonaws.com/${config.s3bucket}/${params.Key}`
})
})
})
break
case 'imgur':
default:
imgur.setClientId(config.imgur.clientID)
imgur.uploadFile(files.image.path)
.then(function (json) {
if (config.debug) { logger.info('SERVER uploadimage success: ' + JSON.stringify(json)) }
res.send({
link: json.data.link.replace(/^http:\/\//i, 'https://')
})
})
.catch(function (err) {
logger.error(err)
return res.status(500).end('upload image error')
})
break
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}
} catch (err) {
logger.error(err)
return res.status(500).end('upload image error')
}
}
})
})
// get new note
app.get('/new', response.newNote)
// get publish note
app.get('/s/:shortid', response.showPublishNote)
// publish note actions
app.get('/s/:shortid/:action', response.publishNoteActions)
// get publish slide
app.get('/p/:shortid', response.showPublishSlide)
// publish slide actions
app.get('/p/:shortid/:action', response.publishSlideActions)
// get note by id
app.get('/:noteId', response.showNote)
// note actions
app.get('/:noteId/:action', response.noteActions)
// note actions with action id
app.get('/:noteId/:action/:actionId', response.noteActions)
// response not found if no any route matches
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 () {
server.listen(config.port, function () {
var schema = config.usessl ? 'HTTPS' : 'HTTP'
logger.info('%s Server listening at port %d', schema, config.port)
config.maintenance = false
})
}
// 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('hackmd has been killed by signal, try to exit gracefully...')
config.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)