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| "use strict";
var SocketIO = require('socket.io');
var socketioWildcard = require('socketio-wildcard')();
var async = require('async');
var nconf = require('nconf');
var cookieParser = require('cookie-parser')(nconf.get('secret'));
var winston = require('winston');
var db = require('../database');
var logger = require('../logger');
var ratelimit = require('../middleware/ratelimit');
var Sockets = {};
var Namespaces = {};
var io;
Sockets.init = function(server) {
requireModules();
io = new SocketIO({
path: nconf.get('relative_path') + '/socket.io'
});
addRedisAdapter(io);
io.use(socketioWildcard);
io.use(authorize);
io.on('connection', onConnection);
io.listen(server, {
transports: nconf.get('socket.io:transports')
});
Sockets.server = io;
};
function onConnection(socket) {
socket.ip = socket.request.headers['x-forwarded-for'] || socket.request.connection.remoteAddress;
logger.io_one(socket, socket.uid);
onConnect(socket);
socket.on('*', function(payload) {
onMessage(socket, payload);
});
}
function onConnect(socket) {
if (socket.uid) {
socket.join('uid_' + socket.uid);
socket.join('online_users');
} else {
socket.join('online_guests');
}
}
function onMessage(socket, payload) {
if (!payload.data.length) {
return winston.warn('[socket.io] Empty payload');
}
var eventName = payload.data[0];
var params = payload.data[1];
var callback = typeof payload.data[payload.data.length - 1] === 'function' ? payload.data[payload.data.length - 1] : function() {};
if (!eventName) {
return winston.warn('[socket.io] Empty method name');
}
var parts = eventName.toString().split('.');
var namespace = parts[0];
var methodToCall = parts.reduce(function(prev, cur) {
if (prev !== null && prev[cur]) {
return prev[cur];
} else {
return null;
}
}, Namespaces);
if(!methodToCall) {
if (process.env.NODE_ENV === 'development') {
winston.warn('[socket.io] Unrecognized message: ' + eventName);
}
return;
}
socket.previousEvents = socket.previousEvents || [];
socket.previousEvents.push(eventName);
if (socket.previousEvents.length > 20) {
socket.previousEvents.shift();
}
if (!eventName.startsWith('admin.') && ratelimit.isFlooding(socket)) {
winston.warn('[socket.io] Too many emits! Disconnecting uid : ' + socket.uid + '. Events : ' + socket.previousEvents);
return socket.disconnect();
}
async.waterfall([
function (next) {
validateSession(socket, next);
},
function (next) {
if (Namespaces[namespace].before) {
Namespaces[namespace].before(socket, eventName, params, next);
} else {
next();
}
},
function (next) {
methodToCall(socket, params, next);
}
], function(err, result) {
callback(err ? {message: err.message} : null, result);
});
}
function requireModules() {
var modules = ['admin', 'categories', 'groups', 'meta', 'modules',
'notifications', 'plugins', 'posts', 'topics', 'user', 'blacklist'
];
modules.forEach(function(module) {
Namespaces[module] = require('./' + module);
});
}
function validateSession(socket, callback) {
var req = socket.request;
if (!req.signedCookies || !req.signedCookies['express.sid']) {
return callback(new Error('[[error:invalid-session]]'));
}
db.sessionStore.get(req.signedCookies['express.sid'], function(err, sessionData) {
if (err || !sessionData) {
return callback(err || new Error('[[error:invalid-session]]'));
}
callback();
});
}
function authorize(socket, callback) {
var request = socket.request;
if (!request) {
return callback(new Error('[[error:not-authorized]]'));
}
async.waterfall([
function(next) {
cookieParser(request, {}, next);
},
function(next) {
db.sessionStore.get(request.signedCookies['express.sid'], function(err, sessionData) {
if (err) {
return next(err);
}
if (sessionData && sessionData.passport && sessionData.passport.user) {
request.session = sessionData;
socket.uid = parseInt(sessionData.passport.user, 10);
} else {
socket.uid = 0;
}
next();
});
}
], callback);
}
function addRedisAdapter(io) {
Iif (nconf.get('redis')) {
var redisAdapter = require('socket.io-redis');
var redis = require('../database/redis');
var pub = redis.connect({return_buffers: true});
var sub = redis.connect({return_buffers: true});
io.adapter(redisAdapter({pubClient: pub, subClient: sub}));
} else Iif (nconf.get('isCluster') === 'true') {
winston.warn('[socket.io] Clustering detected, you are advised to configure Redis as a websocket store.');
}
}
Sockets.in = function(room) {
return io.in(room);
};
Sockets.getUserSocketCount = function(uid) {
if (!io) {
return 0;
}
var room = io.sockets.adapter.rooms['uid_' + uid];
return room ? room.length : 0;
};
Sockets.reqFromSocket = function(socket) {
var headers = socket.request.headers;
var host = headers.host;
var referer = headers.referer || '';
return {
ip: headers['x-forwarded-for'] || socket.ip,
host: host,
protocol: socket.request.connection.encrypted ? 'https' : 'http',
secure: !!socket.request.connection.encrypted,
url: referer,
path: referer.substr(referer.indexOf(host) + host.length),
headers: headers
};
};
module.exports = Sockets;
|