HackMD/lib/realtime.js

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//realtime
//external modules
var cookie = require('cookie');
var cookieParser = require('cookie-parser');
var url = require('url');
var async = require('async');
var LZString = require('lz-string');
var shortId = require('shortid');
var randomcolor = require("randomcolor");
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var Chance = require('chance'),
chance = new Chance();
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var md5 = require("blueimp-md5").md5;
var moment = require('moment');
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//core
var config = require("../config.js");
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var logger = require("./logger.js");
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//ot
var ot = require("./ot/index.js");
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//others
var db = require("./db.js");
var Note = require("./note.js");
var User = require("./user.js");
//public
var realtime = {
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onAuthorizeSuccess: onAuthorizeSuccess,
onAuthorizeFail: onAuthorizeFail,
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secure: secure,
connection: connection,
getStatus: getStatus
};
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function onAuthorizeSuccess(data, accept) {
accept(null, true);
}
function onAuthorizeFail(data, message, error, accept) {
if (error) throw new Error(message);
accept(null, true);
}
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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.cookie[config.sessionname] == handshakeData.sessionID) {
next(new Error('AUTH failed: Cookie is invalid.'));
}
} else {
next(new Error('AUTH failed: No cookie transmitted.'));
}
if (config.debug)
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logger.info("AUTH success cookie: " + handshakeData.sessionID);
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next();
} catch (ex) {
next(new Error("AUTH failed:" + JSON.stringify(ex)));
}
}
function emitCheck(note) {
var out = {
updatetime: note.updatetime
};
for (var i = 0, l = note.socks.length; i < l; i++) {
var sock = note.socks[i];
sock.emit('check', out);
};
}
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//actions
var users = {};
var notes = {};
var updater = setInterval(function () {
async.each(Object.keys(notes), function (key, callback) {
var note = notes[key];
if (note.server.isDirty) {
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if (config.debug)
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logger.info("updater found dirty note: " + key);
var body = note.server.document;
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var title = Note.getNoteTitle(body);
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title = LZString.compressToBase64(title);
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body = LZString.compressToBase64(body);
db.saveToDB(key, title, body, function (err, result) {
if (err) return;
note.server.isDirty = false;
note.updatetime = Date.now();
emitCheck(note);
});
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}
callback();
}, function (err) {
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if (err) return logger.error('updater error', err);
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});
}, 1000);
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function getStatus(callback) {
db.countFromDB(function (err, data) {
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if (err) return logger.info(err);
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var distinctaddresses = [];
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var regaddresses = [];
var distinctregaddresses = [];
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Object.keys(users).forEach(function (key) {
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var user = users[key];
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var found = false;
for (var i = 0; i < distinctaddresses.length; i++) {
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if (user.address == distinctaddresses[i]) {
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found = true;
break;
}
}
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if (!found) {
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distinctaddresses.push(user.address);
}
if (user.login) {
regaddresses.push(user.address);
var found = false;
for (var i = 0; i < distinctregaddresses.length; i++) {
if (user.address == distinctregaddresses[i]) {
found = true;
break;
}
}
if (!found) {
distinctregaddresses.push(user.address);
}
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}
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});
User.getUserCount(function (err, regcount) {
if (err) {
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logger.error('get status failed: ' + err);
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return;
}
if (callback)
callback({
onlineNotes: Object.keys(notes).length,
onlineUsers: Object.keys(users).length,
distinctOnlineUsers: distinctaddresses.length,
notesCount: data.rows[0].count,
registeredUsers: regcount,
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onlineRegisteredUsers: regaddresses.length,
distinctOnlineRegisteredUsers: distinctregaddresses.length
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});
});
});
}
function getNotenameFromSocket(socket) {
var referer = socket.handshake.headers.referer;
if (!referer) {
return socket.disconnect();
}
var hostUrl = url.parse(referer);
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var notename = hostUrl.pathname.split('/')[1];
if (notename == config.featuresnotename) {
return notename;
}
if (!Note.checkNoteIdValid(notename)) {
socket.emit('info', {
code: 404
});
return socket.disconnect();
}
notename = LZString.decompressFromBase64(notename);
return notename;
}
function emitOnlineUsers(socket) {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
var users = [];
Object.keys(notes[notename].users).forEach(function (key) {
var user = notes[notename].users[key];
if (user)
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users.push(buildUserOutData(user));
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});
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var out = {
users: users
};
out = LZString.compressToUTF16(JSON.stringify(out));
for (var i = 0, l = notes[notename].socks.length; i < l; i++) {
var sock = notes[notename].socks[i];
if (sock && out)
sock.emit('online users', out);
};
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}
function emitUserStatus(socket) {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
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var out = buildUserOutData(users[socket.id]);
for (var i = 0, l = notes[notename].socks.length; i < l; i++) {
var sock = notes[notename].socks[i];
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if (sock != socket) {
sock.emit('user status', out);
}
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};
}
function emitRefresh(socket) {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
var note = notes[notename];
socket.emit('refresh', {
owner: note.owner,
permission: note.permission,
updatetime: note.updatetime
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});
}
var isConnectionBusy = false;
var connectionSocketQueue = [];
var isDisconnectBusy = false;
var disconnectSocketQueue = [];
function finishConnection(socket, notename) {
var note = notes[notename];
note.users[socket.id] = users[socket.id];
note.socks.push(socket);
note.server.addClient(socket);
note.server.setName(socket, users[socket.id].name);
note.server.setColor(socket, users[socket.id].color);
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emitOnlineUsers(socket);
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emitRefresh(socket);
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//clear finished socket in queue
for (var i = 0; i < connectionSocketQueue.length; i++) {
if (connectionSocketQueue[i].id == socket.id)
connectionSocketQueue.splice(i, 1);
}
//seek for next socket
isConnectionBusy = false;
if (connectionSocketQueue.length > 0)
startConnection(connectionSocketQueue[0]);
if (config.debug) {
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logger.info('SERVER connected a client to [' + notename + ']:');
logger.info(JSON.stringify(users[socket.id]));
//logger.info(notes);
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getStatus(function (data) {
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logger.info(JSON.stringify(data));
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});
}
}
function startConnection(socket) {
if (isConnectionBusy) return;
isConnectionBusy = true;
var notename = getNotenameFromSocket(socket);
if (!notename) return;
if (!notes[notename]) {
db.readFromDB(notename, function (err, data) {
if (err) {
socket.emit('info', {
code: 404
});
socket.disconnect();
//clear err socket in queue
for (var i = 0; i < connectionSocketQueue.length; i++) {
if (connectionSocketQueue[i].id == socket.id)
connectionSocketQueue.splice(i, 1);
}
isConnectionBusy = false;
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return logger.error(err);
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}
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var owner = data.rows[0].owner;
var permission = "freely";
if (owner && owner != "null") {
permission = "editable";
}
Note.findOrNewNote(notename, permission, function (err, note) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var body = LZString.decompressFromBase64(data.rows[0].content);
//body = LZString.compressToUTF16(body);
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var updatetime = data.rows[0].update_time;
var server = new ot.EditorSocketIOServer(body, [], notename, ifMayEdit);
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notes[notename] = {
owner: owner,
permission: note.permission,
socks: [],
users: {},
updatetime: moment(updatetime).valueOf(),
server: server
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};
finishConnection(socket, notename);
});
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});
} else {
finishConnection(socket, notename);
}
}
function disconnect(socket) {
if (isDisconnectBusy) return;
isDisconnectBusy = true;
if (config.debug) {
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logger.info("SERVER disconnected a client");
logger.info(JSON.stringify(users[socket.id]));
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}
var notename = getNotenameFromSocket(socket);
if (!notename) return;
if (users[socket.id]) {
delete users[socket.id];
}
var note = notes[notename];
if (note) {
delete note.users[socket.id];
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do {
var index = note.socks.indexOf(socket);
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if (index != -1) {
note.socks.splice(index, 1);
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}
} while (index != -1);
if (Object.keys(note.users).length <= 0) {
if (note.server.isDirty) {
var body = note.server.document;
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var title = Note.getNoteTitle(body);
title = LZString.compressToBase64(title);
body = LZString.compressToBase64(body);
db.saveToDB(notename, title, body,
function (err, result) {
delete notes[notename];
if (config.debug) {
//logger.info(notes);
getStatus(function (data) {
logger.info(JSON.stringify(data));
});
}
});
} else {
delete notes[notename];
}
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}
}
emitOnlineUsers(socket);
//clear finished socket in queue
for (var i = 0; i < disconnectSocketQueue.length; i++) {
if (disconnectSocketQueue[i].id == socket.id)
disconnectSocketQueue.splice(i, 1);
}
//seek for next socket
isDisconnectBusy = false;
if (disconnectSocketQueue.length > 0)
disconnect(disconnectSocketQueue[0]);
if (config.debug) {
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//logger.info(notes);
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getStatus(function (data) {
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logger.info(JSON.stringify(data));
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});
}
}
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function buildUserOutData(user) {
var out = {
id: user.id,
login: user.login,
userid: user.userid,
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photo: user.photo,
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color: user.color,
cursor: user.cursor,
name: user.name,
idle: user.idle,
type: user.type
};
return out;
}
function updateUserData(socket, user) {
//retrieve user data from passport
if (socket.request.user && socket.request.user.logged_in) {
var profile = JSON.parse(socket.request.user.profile);
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var photo = null;
switch (profile.provider) {
case "facebook":
photo = 'https://graph.facebook.com/' + profile.id + '/picture';
break;
case "twitter":
photo = profile.photos[0].value;
break;
case "github":
photo = 'https://avatars.githubusercontent.com/u/' + profile.id + '?s=48';
break;
case "dropbox":
//no image api provided, use gravatar
photo = 'https://www.gravatar.com/avatar/' + md5(profile.emails[0].value);
break;
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}
user.photo = photo;
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user.name = profile.displayName || profile.username;
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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function ifMayEdit(socket, callback) {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
var note = notes[notename];
var mayEdit = true;
switch (note.permission) {
case "freely":
//not blocking anyone
break;
case "editable":
//only login user can change
if (!socket.request.user || !socket.request.user.logged_in)
mayEdit = false;
break;
case "locked":
//only owner can change
if (note.owner != socket.request.user._id)
mayEdit = false;
break;
}
callback(mayEdit);
}
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function connection(socket) {
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//split notename from socket
var notename = getNotenameFromSocket(socket);
//initialize user data
//random color
var color = randomcolor({
luminosity: 'light'
});
//make sure color not duplicated or reach max random count
if (notename && notes[notename]) {
var randomcount = 0;
var maxrandomcount = 5;
var found = false;
do {
Object.keys(notes[notename].users).forEach(function (user) {
if (user.color == color) {
found = true;
return;
}
});
if (found) {
color = randomcolor({
luminosity: 'light'
});
randomcount++;
}
} while (found && randomcount < maxrandomcount);
}
//create user data
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users[socket.id] = {
id: socket.id,
address: socket.handshake.address,
'user-agent': socket.handshake.headers['user-agent'],
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color: color,
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cursor: null,
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login: false,
userid: null,
name: null,
idle: false,
type: null
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};
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updateUserData(socket, users[socket.id]);
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//start connection
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connectionSocketQueue.push(socket);
startConnection(socket);
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//received client refresh request
socket.on('refresh', function () {
emitRefresh(socket);
});
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//received user status
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socket.on('user status', function (data) {
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var notename = getNotenameFromSocket(socket);
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if (!notename || !notes[notename]) return;
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if (config.debug)
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logger.info('SERVER received [' + notename + '] user status from [' + socket.id + ']: ' + JSON.stringify(data));
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if (data) {
var user = users[socket.id];
user.idle = data.idle;
user.type = data.type;
}
emitUserStatus(socket);
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});
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//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 notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
var note = notes[notename];
//Only owner can change permission
if (note.owner == socket.request.user._id) {
note.permission = permission;
Note.findNote(notename, function (err, _note) {
if (err || !_note) {
return;
}
Note.updatePermission(_note, permission, function (err, _note) {
if (err || !_note) {
return;
}
var out = {
permission: permission
};
for (var i = 0, l = note.socks.length; i < l; i++) {
var sock = note.socks[i];
sock.emit('permission', out);
};
});
});
}
}
});
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//reveiced when user logout or changed
socket.on('user changed', function () {
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logger.info('user changed');
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var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
updateUserData(socket, notes[notename].users[socket.id]);
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emitOnlineUsers(socket);
});
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//received sync of online users request
socket.on('online users', function () {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
var users = [];
Object.keys(notes[notename].users).forEach(function (key) {
var user = notes[notename].users[key];
if (user)
users.push(buildUserOutData(user));
});
var out = {
users: users
};
out = LZString.compressToUTF16(JSON.stringify(out));
socket.emit('online users', out);
});
//check version
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socket.on('version', function () {
socket.emit('version', config.version);
});
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//received cursor focus
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socket.on('cursor focus', function (data) {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
users[socket.id].cursor = data;
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var out = buildUserOutData(users[socket.id]);
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for (var i = 0, l = notes[notename].socks.length; i < l; i++) {
var sock = notes[notename].socks[i];
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if (sock != socket) {
sock.emit('cursor focus', out);
}
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};
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});
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//received cursor activity
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socket.on('cursor activity', function (data) {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
users[socket.id].cursor = data;
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var out = buildUserOutData(users[socket.id]);
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for (var i = 0, l = notes[notename].socks.length; i < l; i++) {
var sock = notes[notename].socks[i];
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if (sock != socket) {
sock.emit('cursor activity', out);
}
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};
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});
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//received cursor blur
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socket.on('cursor blur', function () {
var notename = getNotenameFromSocket(socket);
if (!notename || !notes[notename]) return;
users[socket.id].cursor = null;
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var out = {
id: socket.id
};
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for (var i = 0, l = notes[notename].socks.length; i < l; i++) {
var sock = notes[notename].socks[i];
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if (sock != socket) {
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sock.emit('cursor blur', out);
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}
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};
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});
//when a new client disconnect
socket.on('disconnect', function () {
disconnectSocketQueue.push(socket);
disconnect(socket);
});
}
module.exports = realtime;