HackMD/lib/realtime.js

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JavaScript
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'use strict'
// realtime
// external modules
var cookie = require('cookie')
var cookieParser = require('cookie-parser')
var url = require('url')
var async = require('async')
var randomcolor = require('randomcolor')
var Chance = require('chance')
var chance = new Chance()
var moment = require('moment')
// core
var config = require('./config')
var logger = require('./logger')
var history = require('./history')
var models = require('./models')
// ot
var ot = require('./ot')
// public
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var realtime = {
io: null,
onAuthorizeSuccess: onAuthorizeSuccess,
onAuthorizeFail: onAuthorizeFail,
secure: secure,
connection: connection,
getStatus: getStatus,
isReady: isReady,
maintenance: true
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}
function onAuthorizeSuccess (data, accept) {
accept()
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}
function onAuthorizeFail (data, message, error, accept) {
accept() // accept whether authorize or not to allow anonymous usage
}
// secure the origin by the cookie
function secure (socket, next) {
try {
var handshakeData = socket.request
if (handshakeData.headers.cookie) {
handshakeData.cookie = cookie.parse(handshakeData.headers.cookie)
handshakeData.sessionID = cookieParser.signedCookie(handshakeData.cookie[config.sessionName], config.sessionSecret)
if (handshakeData.sessionID &&
handshakeData.cookie[config.sessionName] &&
handshakeData.cookie[config.sessionName] !== handshakeData.sessionID) {
logger.debug(`AUTH success cookie: ${handshakeData.sessionID}`)
return next()
} else {
next(new Error('AUTH failed: Cookie is invalid.'))
}
} else {
next(new Error('AUTH failed: No cookie transmitted.'))
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}
} catch (ex) {
next(new Error('AUTH failed:' + JSON.stringify(ex)))
}
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}
function emitCheck (note) {
var out = {
title: note.title,
updatetime: note.updatetime,
lastchangeuser: note.lastchangeuser,
lastchangeuserprofile: note.lastchangeuserprofile,
authors: note.authors,
authorship: note.authorship
}
realtime.io.to(note.id).emit('check', out)
}
// actions
var users = {}
var notes = {}
// update when the note is dirty
setInterval(function () {
async.each(Object.keys(notes), function (key, callback) {
var note = notes[key]
if (note.server.isDirty) {
logger.debug(`updater found dirty note: ${key}`)
note.server.isDirty = false
updateNote(note, function (err, _note) {
// handle when note already been clean up
if (!notes[key] || !notes[key].server) return callback(null, null)
if (!_note) {
realtime.io.to(note.id).emit('info', {
code: 404
})
logger.error('note not found: ', note.id)
}
if (err || !_note) {
for (var i = 0, l = note.socks.length; i < l; i++) {
var sock = note.socks[i]
if (typeof sock !== 'undefined' && sock) {
setTimeout(function () {
sock.disconnect(true)
}, 0)
}
}
return callback(err, null)
}
note.updatetime = moment(_note.lastchangeAt).valueOf()
emitCheck(note)
return callback(null, null)
})
} else {
return callback(null, null)
}
}, function (err) {
if (err) return logger.error('updater error', err)
})
}, 1000)
function updateNote (note, callback) {
models.Note.findOne({
where: {
id: note.id
}
}).then(function (_note) {
if (!_note) return callback(null, null)
// update user note history
var tempUsers = Object.assign({}, note.tempUsers)
note.tempUsers = {}
Object.keys(tempUsers).forEach(function (key) {
updateHistory(key, note, tempUsers[key])
})
if (note.lastchangeuser) {
if (_note.lastchangeuserId !== note.lastchangeuser) {
models.User.findOne({
where: {
id: note.lastchangeuser
}
}).then(function (user) {
if (!user) return callback(null, null)
note.lastchangeuserprofile = models.User.getProfile(user)
return finishUpdateNote(note, _note, callback)
}).catch(function (err) {
logger.error(err)
return callback(err, null)
})
} else {
return finishUpdateNote(note, _note, callback)
}
} else {
note.lastchangeuserprofile = null
return finishUpdateNote(note, _note, callback)
}
}).catch(function (err) {
logger.error(err)
return callback(err, null)
})
}
function finishUpdateNote (note, _note, callback) {
if (!note || !note.server) return callback(null, null)
var body = note.server.document
var title = note.title = models.Note.parseNoteTitle(body)
var values = {
title: title,
content: body,
authorship: note.authorship,
lastchangeuserId: note.lastchangeuser,
lastchangeAt: Date.now()
}
_note.update(values).then(function (_note) {
saverSleep = false
return callback(null, _note)
}).catch(function (err) {
logger.error(err)
return callback(err, null)
})
}
// clean when user not in any rooms or user not in connected list
setInterval(function () {
async.each(Object.keys(users), function (key, callback) {
var socket = realtime.io.sockets.connected[key]
if ((!socket && users[key]) ||
(socket && (!socket.rooms || socket.rooms.length <= 0))) {
logger.debug(`cleaner found redundant user: ${key}`)
if (!socket) {
socket = {
id: key
}
}
disconnectSocketQueue.push(socket)
disconnect(socket)
}
return callback(null, null)
}, function (err) {
if (err) return logger.error('cleaner error', err)
})
}, 60000)
var saverSleep = false
// save note revision in interval
setInterval(function () {
if (saverSleep) return
models.Revision.saveAllNotesRevision(function (err, notes) {
if (err) return logger.error('revision saver failed: ' + err)
if (notes && notes.length <= 0) {
saverSleep = true
}
})
}, 60000 * 5)
function getStatus (callback) {
models.Note.count().then(function (notecount) {
var distinctaddresses = []
var regaddresses = []
var distinctregaddresses = []
Object.keys(users).forEach(function (key) {
var user = users[key]
if (!user) return
let found = false
for (let i = 0; i < distinctaddresses.length; i++) {
if (user.address === distinctaddresses[i]) {
found = true
break
}
}
if (!found) {
distinctaddresses.push(user.address)
}
if (user.login) {
regaddresses.push(user.address)
let found = false
for (let i = 0; i < distinctregaddresses.length; i++) {
if (user.address === distinctregaddresses[i]) {
found = true
break
}
}
if (!found) {
distinctregaddresses.push(user.address)
}
}
})
models.User.count().then(function (regcount) {
// eslint-disable-next-line standard/no-callback-literal
return callback ? callback({
onlineNotes: Object.keys(notes).length,
onlineUsers: Object.keys(users).length,
distinctOnlineUsers: distinctaddresses.length,
notesCount: notecount,
registeredUsers: regcount,
onlineRegisteredUsers: regaddresses.length,
distinctOnlineRegisteredUsers: distinctregaddresses.length,
isConnectionBusy: isConnectionBusy,
connectionSocketQueueLength: connectionSocketQueue.length,
isDisconnectBusy: isDisconnectBusy,
disconnectSocketQueueLength: disconnectSocketQueue.length
}) : null
}).catch(function (err) {
return logger.error('count user failed: ' + err)
})
}).catch(function (err) {
return logger.error('count note failed: ' + err)
})
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}
function isReady () {
return realtime.io &&
Object.keys(notes).length === 0 && Object.keys(users).length === 0 &&
connectionSocketQueue.length === 0 && !isConnectionBusy &&
disconnectSocketQueue.length === 0 && !isDisconnectBusy
}
function extractNoteIdFromSocket (socket) {
if (!socket || !socket.handshake) {
return false
}
if (socket.handshake.query && socket.handshake.query.noteId) {
return socket.handshake.query.noteId
} else if (socket.handshake.headers) {
// this part is only for backward compatibility only; current code
// should be using noteId query parameter instead.
var referer = socket.handshake.headers.referer
if (!referer) {
return false
}
var hostUrl = url.URL.parse(referer)
var noteId = config.urlPath ? hostUrl.pathname.slice(config.urlPath.length + 1, hostUrl.pathname.length).split('/')[1] : hostUrl.pathname.split('/')[1]
return noteId
} else {
return false
}
}
function parseNoteIdFromSocket (socket, callback) {
var noteId = extractNoteIdFromSocket(socket)
if (!noteId) {
return callback(null, null)
}
models.Note.parseNoteId(noteId, function (err, id) {
if (err || !id) return callback(err, id)
return callback(null, id)
})
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}
function emitOnlineUsers (socket) {
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var users = []
Object.keys(notes[noteId].users).forEach(function (key) {
var user = notes[noteId].users[key]
if (user) { users.push(buildUserOutData(user)) }
})
var out = {
users: users
}
realtime.io.to(noteId).emit('online users', out)
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}
function emitUserStatus (socket) {
var noteId = socket.noteId
var user = users[socket.id]
if (!noteId || !notes[noteId] || !user) return
var out = buildUserOutData(user)
socket.broadcast.to(noteId).emit('user status', out)
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}
function emitRefresh (socket) {
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var note = notes[noteId]
var out = {
title: note.title,
docmaxlength: config.documentMaxLength,
owner: note.owner,
ownerprofile: note.ownerprofile,
lastchangeuser: note.lastchangeuser,
lastchangeuserprofile: note.lastchangeuserprofile,
authors: note.authors,
authorship: note.authorship,
permission: note.permission,
createtime: note.createtime,
updatetime: note.updatetime
}
socket.emit('refresh', out)
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}
function isDuplicatedInSocketQueue (queue, socket) {
for (var i = 0; i < queue.length; i++) {
if (queue[i] && queue[i].id === socket.id) {
return true
}
}
return false
}
function clearSocketQueue (queue, socket) {
for (var i = 0; i < queue.length; i++) {
if (!queue[i] || queue[i].id === socket.id) {
queue.splice(i, 1)
i--
}
}
}
function connectNextSocket () {
setTimeout(function () {
isConnectionBusy = false
if (connectionSocketQueue.length > 0) {
startConnection(connectionSocketQueue[0])
}
}, 1)
}
function interruptConnection (socket, noteId, socketId) {
if (notes[noteId]) delete notes[noteId]
if (users[socketId]) delete users[socketId]
if (socket) { clearSocketQueue(connectionSocketQueue, socket) } else { connectionSocketQueue.shift() }
connectNextSocket()
}
function checkViewPermission (req, note) {
if (note.permission === 'private') {
if (req.user && req.user.logged_in && req.user.id === note.owner) { return true } else { return false }
} else if (note.permission === 'limited' || note.permission === 'protected') {
if (req.user && req.user.logged_in) { return true } else { return false }
} else {
return true
}
}
var isConnectionBusy = false
var connectionSocketQueue = []
var isDisconnectBusy = false
var disconnectSocketQueue = []
function finishConnection (socket, noteId, socketId) {
// if no valid info provided will drop the client
if (!socket || !notes[noteId] || !users[socketId]) {
return interruptConnection(socket, noteId, socketId)
}
// check view permission
if (!checkViewPermission(socket.request, notes[noteId])) {
interruptConnection(socket, noteId, socketId)
return failConnection(403, 'connection forbidden', socket)
}
let note = notes[noteId]
let user = users[socketId]
// update user color to author color
if (note.authors[user.userid]) {
user.color = users[socket.id].color = note.authors[user.userid].color
}
note.users[socket.id] = user
note.socks.push(socket)
note.server.addClient(socket)
note.server.setName(socket, user.name)
note.server.setColor(socket, user.color)
// update user note history
updateHistory(user.userid, note)
emitOnlineUsers(socket)
emitRefresh(socket)
// clear finished socket in queue
clearSocketQueue(connectionSocketQueue, socket)
// seek for next socket
connectNextSocket()
if (config.debug) {
let noteId = socket.noteId
logger.debug(`SERVER connected a client to [${noteId}]:`)
logger.debug(JSON.stringify(user))
logger.debug(notes)
getStatus(function (data) {
logger.debug(JSON.stringify(data))
})
}
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}
function startConnection (socket) {
if (isConnectionBusy) return
isConnectionBusy = true
var noteId = socket.noteId
if (!noteId) {
return failConnection(404, 'note id not found', socket)
}
if (!notes[noteId]) {
var include = [{
model: models.User,
as: 'owner'
}, {
model: models.User,
as: 'lastchangeuser'
}, {
model: models.Author,
as: 'authors',
include: [{
model: models.User,
as: 'user'
}]
}]
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models.Note.findOne({
where: {
id: noteId
},
include: include
}).then(function (note) {
if (!note) {
return failConnection(404, 'note not found', socket)
}
var owner = note.ownerId
var ownerprofile = note.owner ? models.User.getProfile(note.owner) : null
var lastchangeuser = note.lastchangeuserId
var lastchangeuserprofile = note.lastchangeuser ? models.User.getProfile(note.lastchangeuser) : null
var body = note.content
var createtime = note.createdAt
var updatetime = note.lastchangeAt
var server = new ot.EditorSocketIOServer(body, [], noteId, ifMayEdit, operationCallback)
var authors = {}
for (var i = 0; i < note.authors.length; i++) {
var author = note.authors[i]
var profile = models.User.getProfile(author.user)
if (profile) {
authors[author.userId] = {
userid: author.userId,
color: author.color,
photo: profile.photo,
name: profile.name
}
}
}
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notes[noteId] = {
id: noteId,
alias: note.alias,
title: note.title,
owner: owner,
ownerprofile: ownerprofile,
permission: note.permission,
lastchangeuser: lastchangeuser,
lastchangeuserprofile: lastchangeuserprofile,
socks: [],
users: {},
tempUsers: {},
createtime: moment(createtime).valueOf(),
updatetime: moment(updatetime).valueOf(),
server: server,
authors: authors,
authorship: note.authorship
}
return finishConnection(socket, noteId, socket.id)
}).catch(function (err) {
return failConnection(500, err, socket)
})
} else {
return finishConnection(socket, noteId, socket.id)
}
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}
function failConnection (code, err, socket) {
logger.error(err)
// clear error socket in queue
clearSocketQueue(connectionSocketQueue, socket)
connectNextSocket()
// emit error info
socket.emit('info', {
code: code
})
return socket.disconnect(true)
}
function disconnect (socket) {
if (isDisconnectBusy) return
isDisconnectBusy = true
logger.debug('SERVER disconnected a client')
logger.debug(JSON.stringify(users[socket.id]))
if (users[socket.id]) {
delete users[socket.id]
}
var noteId = socket.noteId
var note = notes[noteId]
if (note) {
// delete user in users
if (note.users[socket.id]) {
delete note.users[socket.id]
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}
// remove sockets in the note socks
do {
var index = note.socks.indexOf(socket)
if (index !== -1) {
note.socks.splice(index, 1)
}
} while (index !== -1)
// remove note in notes if no user inside
if (Object.keys(note.users).length <= 0) {
if (note.server.isDirty) {
updateNote(note, function (err, _note) {
if (err) return logger.error('disconnect note failed: ' + err)
// clear server before delete to avoid memory leaks
note.server.document = ''
note.server.operations = []
delete note.server
delete notes[noteId]
if (config.debug) {
logger.debug(notes)
getStatus(function (data) {
logger.debug(JSON.stringify(data))
})
}
})
} else {
delete note.server
delete notes[noteId]
}
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}
}
emitOnlineUsers(socket)
// clear finished socket in queue
clearSocketQueue(disconnectSocketQueue, socket)
// seek for next socket
isDisconnectBusy = false
if (disconnectSocketQueue.length > 0) { disconnect(disconnectSocketQueue[0]) }
if (config.debug) {
logger.debug(notes)
getStatus(function (data) {
logger.debug(JSON.stringify(data))
})
}
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}
function buildUserOutData (user) {
var out = {
id: user.id,
login: user.login,
userid: user.userid,
photo: user.photo,
color: user.color,
cursor: user.cursor,
name: user.name,
idle: user.idle,
type: user.type
}
return out
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}
function updateUserData (socket, user) {
// retrieve user data from passport
if (socket.request.user && socket.request.user.logged_in) {
var profile = models.User.getProfile(socket.request.user)
user.photo = profile.photo
user.name = profile.name
user.userid = socket.request.user.id
user.login = true
} else {
user.userid = null
user.name = 'Guest ' + chance.last()
user.login = false
}
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}
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function ifMayEdit (socket, callback) {
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var note = notes[noteId]
var mayEdit = true
switch (note.permission) {
case 'freely':
// not blocking anyone
break
case 'editable': case 'limited':
// only login user can change
if (!socket.request.user || !socket.request.user.logged_in) { mayEdit = false }
break
case 'locked': case 'private': case 'protected':
// only owner can change
if (!note.owner || note.owner !== socket.request.user.id) { mayEdit = false }
break
}
// if user may edit and this is a text operation
if (socket.origin === 'operation' && mayEdit) {
// save for the last change user id
if (socket.request.user && socket.request.user.logged_in) {
note.lastchangeuser = socket.request.user.id
} else {
note.lastchangeuser = null
}
}
return callback(mayEdit)
}
function operationCallback (socket, operation) {
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var note = notes[noteId]
var userId = null
// save authors
if (socket.request.user && socket.request.user.logged_in) {
var user = users[socket.id]
if (!user) return
userId = socket.request.user.id
if (!note.authors[userId]) {
models.Author.findOrCreate({
where: {
noteId: noteId,
userId: userId
},
defaults: {
noteId: noteId,
userId: userId,
color: user.color
}
}).spread(function (author, created) {
if (author) {
note.authors[author.userId] = {
userid: author.userId,
color: author.color,
photo: user.photo,
name: user.name
}
}
}).catch(function (err) {
return logger.error('operation callback failed: ' + err)
})
}
note.tempUsers[userId] = Date.now()
}
// save authorship - use timer here because it's an O(n) complexity algorithm
setImmediate(function () {
note.authorship = models.Note.updateAuthorshipByOperation(operation, userId, note.authorship)
})
}
function updateHistory (userId, note, time) {
var noteId = note.alias ? note.alias : models.Note.encodeNoteId(note.id)
if (note.server) history.updateHistory(userId, noteId, note.server.document, time)
}
function connection (socket) {
if (realtime.maintenance) return
parseNoteIdFromSocket(socket, function (err, noteId) {
if (err) {
return failConnection(500, err, socket)
}
if (!noteId) {
return failConnection(404, 'note id not found', socket)
}
if (isDuplicatedInSocketQueue(connectionSocketQueue, socket)) return
// store noteId in this socket session
socket.noteId = noteId
// initialize user data
// random color
var color = randomcolor()
// make sure color not duplicated or reach max random count
if (notes[noteId]) {
var randomcount = 0
var maxrandomcount = 10
var found = false
do {
Object.keys(notes[noteId].users).forEach(function (userId) {
if (notes[noteId].users[userId].color === color) {
found = true
}
})
if (found) {
color = randomcolor()
randomcount++
}
} while (found && randomcount < maxrandomcount)
}
// create user data
users[socket.id] = {
id: socket.id,
address: socket.handshake.headers['x-forwarded-for'] || socket.handshake.address,
'user-agent': socket.handshake.headers['user-agent'],
color: color,
cursor: null,
login: false,
userid: null,
name: null,
idle: false,
type: null
}
updateUserData(socket, users[socket.id])
// start connection
connectionSocketQueue.push(socket)
startConnection(socket)
})
// received client refresh request
socket.on('refresh', function () {
emitRefresh(socket)
})
// received user status
socket.on('user status', function (data) {
var noteId = socket.noteId
var user = users[socket.id]
if (!noteId || !notes[noteId] || !user) return
logger.debug(`SERVER received [${noteId}] user status from [${socket.id}]: ${JSON.stringify(data)}`)
if (data) {
user.idle = data.idle
user.type = data.type
}
emitUserStatus(socket)
})
// received note permission change request
socket.on('permission', function (permission) {
// need login to do more actions
if (socket.request.user && socket.request.user.logged_in) {
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var note = notes[noteId]
// Only owner can change permission
if (note.owner && note.owner === socket.request.user.id) {
if (permission === 'freely' && !config.allowAnonymous && !config.allowAnonymousEdits) return
note.permission = permission
models.Note.update({
permission: permission
}, {
where: {
id: noteId
}
}).then(function (count) {
if (!count) {
return
}
var out = {
permission: permission
}
realtime.io.to(note.id).emit('permission', out)
for (var i = 0, l = note.socks.length; i < l; i++) {
var sock = note.socks[i]
if (typeof sock !== 'undefined' && sock) {
// check view permission
if (!checkViewPermission(sock.request, note)) {
sock.emit('info', {
code: 403
})
setTimeout(function () {
sock.disconnect(true)
}, 0)
}
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}
}
}).catch(function (err) {
return logger.error('update note permission failed: ' + err)
})
}
}
})
// delete a note
socket.on('delete', function () {
// need login to do more actions
if (socket.request.user && socket.request.user.logged_in) {
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var note = notes[noteId]
// Only owner can delete note
if (note.owner && note.owner === socket.request.user.id) {
models.Note.destroy({
where: {
id: noteId
}
}).then(function (count) {
if (!count) return
for (var i = 0, l = note.socks.length; i < l; i++) {
var sock = note.socks[i]
if (typeof sock !== 'undefined' && sock) {
sock.emit('delete')
setTimeout(function () {
sock.disconnect(true)
}, 0)
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}
}
}).catch(function (err) {
return logger.error('delete note failed: ' + err)
})
}
}
})
// reveiced when user logout or changed
socket.on('user changed', function () {
logger.info('user changed')
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var user = notes[noteId].users[socket.id]
if (!user) return
updateUserData(socket, user)
emitOnlineUsers(socket)
})
// received sync of online users request
socket.on('online users', function () {
var noteId = socket.noteId
if (!noteId || !notes[noteId]) return
var users = []
Object.keys(notes[noteId].users).forEach(function (key) {
var user = notes[noteId].users[key]
if (user) { users.push(buildUserOutData(user)) }
})
var out = {
users: users
}
socket.emit('online users', out)
})
// check version
socket.on('version', function () {
socket.emit('version', {
version: config.fullversion,
minimumCompatibleVersion: config.minimumCompatibleVersion
})
})
// received cursor focus
socket.on('cursor focus', function (data) {
var noteId = socket.noteId
var user = users[socket.id]
if (!noteId || !notes[noteId] || !user) return
user.cursor = data
var out = buildUserOutData(user)
socket.broadcast.to(noteId).emit('cursor focus', out)
})
// received cursor activity
socket.on('cursor activity', function (data) {
var noteId = socket.noteId
var user = users[socket.id]
if (!noteId || !notes[noteId] || !user) return
user.cursor = data
var out = buildUserOutData(user)
socket.broadcast.to(noteId).emit('cursor activity', out)
})
// received cursor blur
socket.on('cursor blur', function () {
var noteId = socket.noteId
var user = users[socket.id]
if (!noteId || !notes[noteId] || !user) return
user.cursor = null
var out = {
id: socket.id
}
socket.broadcast.to(noteId).emit('cursor blur', out)
})
// when a new client disconnect
socket.on('disconnect', function () {
if (isDuplicatedInSocketQueue(socket, disconnectSocketQueue)) return
disconnectSocketQueue.push(socket)
disconnect(socket)
})
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}
module.exports = realtime