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/**
* Main websocket server handling communications and connection events
*
* Version: v2.0.0
* Developer: Marzavec ( https://github.com/marzavec )
* License: WTFPL ( http://www.wtfpl.net/txt/copying/ )
*
*/
'use strict';
const wsServer = require('ws').Server;
const Police = require('./rateLimiter');
class server extends wsServer {
/**
* Create a HackChat server instance.
*
* @param {Object} core Reference to the core server object
*/
constructor (core) {
super({ port: core.config.websocketPort });
this._core = core;
this._police = new Police();
this._cmdBlacklist = {};
this.on('error', (err) => {
this.handleError('server', err);
});
this.on('connection', (socket, request) => {
this.newConnection(socket, request);
});
}
/**
* Bind listeners for the new socket created on connection to this class
*
* @param {Object} socket New socket object
* @param {Object} request Initial headers of the new connection
*/
newConnection (socket, request) {
socket.remoteAddress = request.headers['x-forwarded-for'] || request.connection.remoteAddress;
socket.on('message', ((data) => {
this.handleData(socket, data);
}).bind(this));
socket.on('close', (() => {
this.handleClose(socket);
}).bind(this));
socket.on('error', ((err) => {
this.handleError(socket, err);
}).bind(this));
}
/**
* Handle incoming messages from clients, parse and check command, then hand-off
*
* @param {Object} socket Calling socket object
* @param {String} data Message sent from client
*/
handleData (socket, data) {
// TODO: Rate limit here
// Don't penalize yet, but check whether IP is rate-limited
if (this._police.frisk(socket.remoteAddress, 0)) {
this.reply({ cmd: 'warn', text: "Your IP is being rate-limited or blocked." }, socket);
return;
}
// Penalize here, but don't do anything about it
this._police.frisk(socket.remoteAddress, 1);
// ignore ridiculously large packets
if (data.length > 65536) {
return;
}
var args = null;
try {
args = JSON.parse(data);
} catch (e) {
// Client sent malformed json, gtfo
socket.close();
}
if (args === null)
return;
if (typeof args.cmd === 'undefined' || args.cmd == 'ping')
return;
var cmd = args.cmd;
if (typeof socket.channel === 'undefined' && cmd !== 'join')
return;
if (typeof this._cmdBlacklist[cmd] === 'function') {
return;
}
this._core.commands.handleCommand(this, socket, args);
}
/**
* Handle socket close from clients
*
* @param {Object} socket Closing socket object
*/
handleClose (socket) {
try {
if (socket.channel) {
this.broadcast({
cmd: 'onlineRemove',
nick: socket.nick
}, { channel: socket.channel });
}
} catch (e) {
// TODO: Should this be added to the error log?
}
}
/**
* "Handle" server or socket errors
*
* @param {Object||String} socket Calling socket object, or 'server'
* @param {String} err The sad stuff
*/
handleError (socket, err) {
// Meh, yolo
// I mean;
// TODO: Should this be added to the error log?
}
/**
* Send data payload to specific socket/client
*
* @param {Object} data Object to convert to json for transmission
* @param {Object} socket The target client
*/
send (data, socket) {
// Add timestamp to command
data.time = Date.now();
try {
if (socket.readyState == 1) { // Who says statically checking port status is bad practice? Everyone? Damnit. #TODO
socket.send(JSON.stringify(data));
}
} catch (e) { }
}
/**
* Overload function for `this.send()`
*
* @param {Object} data Object to convert to json for transmission
* @param {Object} socket The target client
*/
reply (data, socket) {
this.send(data, socket);
}
/**
* Finds sockets/clients that meet the filter requirements, then passes the data to them
*
* @param {Object} data Object to convert to json for transmission
* @param {Object} filter The socket must of equal or greater attribs matching `filter`
* = {} // matches all
* = { channel: 'programming' } // matches any socket where (`socket.channel` === 'programming')
* = { channel: 'programming', nick: 'Marzavec' } // matches any socket where (`socket.channel` === 'programming' && `socket.nick` === 'Marzavec')
*/
broadcast (data, filter) {
let filterAttribs = Object.keys(filter);
let reqCount = filterAttribs.length;
let curMatch;
let sent = false;
for ( let socket of this.clients ) {
curMatch = 0;
for( let i = 0; i < reqCount; i++ ) {
if (typeof socket[filterAttribs[i]] !== 'undefined' && socket[filterAttribs[i]] === filter[filterAttribs[i]])
curMatch++;
}
if (curMatch === reqCount) {
this.send(data, socket);
sent = true;
}
}
return sent;
}
}
module.exports = server;
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