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index.js
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index.js
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'use strict';
const os = require('os');
const nconf = require('nconf');
const winston = require('winston');
const url = require('url');
const util = require('util');
const cookieParser = require('cookie-parser')(nconf.get('secret'));
const db = require('../database');
const user = require('../user');
const logger = require('../logger');
const plugins = require('../plugins');
const ratelimit = require('../middleware/ratelimit');
const Namespaces = {};
const Sockets = module.exports;
Sockets.init = function (server) {
requireModules();
const SocketIO = require('socket.io');
const socketioWildcard = require('socketio-wildcard')();
const io = new SocketIO({
path: nconf.get('relative_path') + '/socket.io',
});
if (nconf.get('isCluster')) {
if (nconf.get('singleHostCluster')) {
io.adapter(require('./single-host-cluster'));
} else if (nconf.get('redis')) {
io.adapter(require('../database/redis').socketAdapter());
} else {
io.adapter(db.socketAdapter());
}
}
io.use(socketioWildcard);
io.use(authorize);
io.on('connection', onConnection);
/*
* Restrict socket.io listener to cookie domain. If none is set, infer based on url.
* Production only so you don't get accidentally locked out.
* Can be overridden via config (socket.io:origins)
*/
if (process.env.NODE_ENV !== 'development') {
const parsedUrl = url.parse(nconf.get('url'));
// cookies don't provide isolation by port: http://stackoverflow.com/a/16328399/122353
const domain = nconf.get('cookieDomain') || parsedUrl.hostname;
const origins = nconf.get('socket.io:origins') || `${parsedUrl.protocol}//${domain}:*`;
nconf.set('socket.io:origins', origins);
io.origins(origins);
winston.info('[socket.io] Restricting access to origin: ' + origins);
}
io.listen(server, {
transports: nconf.get('socket.io:transports'),
cookie: false,
});
Sockets.server = io;
};
function onConnection(socket) {
socket.ip = (socket.request.headers['x-forwarded-for'] || socket.request.connection.remoteAddress || '').split(',')[0];
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');
}
socket.join('sess_' + socket.request.signedCookies[nconf.get('sessionKey')]);
Sockets.server.sockets.sockets[socket.id].emit('checkSession', socket.uid);
Sockets.server.sockets.sockets[socket.id].emit('setHostname', os.hostname());
}
async function onMessage(socket, payload) {
if (!payload.data.length) {
return winston.warn('[socket.io] Empty payload');
}
const eventName = payload.data[0];
const params = typeof payload.data[1] === 'function' ? {} : payload.data[1];
const 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');
}
const parts = eventName.toString().split('.');
const namespace = parts[0];
const methodToCall = parts.reduce(function (prev, cur) {
if (prev !== null && prev[cur]) {
return prev[cur];
}
return null;
}, Namespaces);
if (!methodToCall || typeof methodToCall !== 'function') {
if (process.env.NODE_ENV === 'development') {
winston.warn('[socket.io] Unrecognized message: ' + eventName);
}
return callback({ message: '[[error:invalid-event]]' });
}
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();
}
try {
await checkMaintenance(socket);
await validateSession(socket);
if (Namespaces[namespace].before) {
await Namespaces[namespace].before(socket, eventName, params);
}
if (methodToCall.constructor && methodToCall.constructor.name === 'AsyncFunction') {
const result = await methodToCall(socket, params);
callback(null, result);
} else {
methodToCall(socket, params, function (err, result) {
callback(err ? { message: err.message } : null, result);
});
}
} catch (err) {
winston.error(err.stack ? err.stack : err.message);
callback({ message: err.message });
}
}
function requireModules() {
var modules = ['admin', 'categories', 'groups', 'meta', 'modules',
'notifications', 'plugins', 'posts', 'topics', 'user', 'blacklist', 'flags',
];
modules.forEach(function (module) {
Namespaces[module] = require('./' + module);
});
}
async function checkMaintenance(socket) {
const meta = require('../meta');
if (!meta.config.maintenanceMode) {
return;
}
const isAdmin = await user.isAdministrator(socket.uid);
if (isAdmin) {
return;
}
throw new Error('[[error:forum-maintenance]]');
}
const getSessionAsync = util.promisify((sid, callback) => db.sessionStore.get(sid, (err, sessionObj) => callback(err, sessionObj || null)));
async function validateSession(socket) {
var req = socket.request;
if (!req.signedCookies || !req.signedCookies[nconf.get('sessionKey')]) {
return;
}
const sessionData = await getSessionAsync(req.signedCookies[nconf.get('sessionKey')]);
if (!sessionData) {
throw new Error('[[error:invalid-session]]');
}
const result = await plugins.fireHook('static:sockets.validateSession', {
req: req,
socket: socket,
session: sessionData,
});
return result;
}
const cookieParserAsync = util.promisify((req, callback) => cookieParser(req, {}, err => callback(err)));
async function authorize(socket, callback) {
const request = socket.request;
if (!request) {
return callback(new Error('[[error:not-authorized]]'));
}
await cookieParserAsync(request);
const sessionData = await getSessionAsync(request.signedCookies[nconf.get('sessionKey')]);
if (sessionData && sessionData.passport && sessionData.passport.user) {
request.session = sessionData;
socket.uid = parseInt(sessionData.passport.user, 10);
} else {
socket.uid = 0;
}
callback();
}
Sockets.in = function (room) {
return Sockets.server && Sockets.server.in(room);
};
Sockets.getUserSocketCount = function (uid) {
if (!Sockets.server) {
return 0;
}
const room = Sockets.server.sockets.adapter.rooms['uid_' + uid];
return room ? room.length : 0;
};
Sockets.reqFromSocket = function (socket, payload, event) {
var headers = socket.request ? socket.request.headers : {};
var encrypted = socket.request ? !!socket.request.connection.encrypted : false;
var host = headers.host;
var referer = headers.referer || '';
var data = ((payload || {}).data || []);
if (!host) {
host = url.parse(referer).host || '';
}
return {
uid: socket.uid,
params: data[1],
method: event || data[0],
body: payload,
ip: socket.ip,
host: host,
protocol: encrypted ? 'https' : 'http',
secure: encrypted,
url: referer,
path: referer.substr(referer.indexOf(host) + host.length),
headers: headers,
};
};