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'use strict';
const Net = require('net');
const EventEmitter = require('events');
const Util = require('./util');
// Interpret as Command Sequences.
const kEscape = new Buffer([0xFF, 0xF4, 0XFF, 0xFD, 0x06]); // IAC IP IAC DO TIMING_MARK
const kNAWSRequest = new Buffer([0xFF, 0xFD, 0X1F]); // IAC DO NAWS
const kNAWSResponse = new Buffer([0xFF, 0xFB, 0X1F, 0xFF, 0xFA, 0X1F]); // IAC WILL NAWS IAC SB NAWS
// Main tomato sauce class. Properties:
// * screens <TomatoSauce.IScreen[]>
// * renderers <TomatoSauce.IRenderer[]>
// * port <int>
// * frequency <int>
// * modulation <int>
//
// The main entry point is the #run() function.
//
// It emits a listening event that contains the server information on
// the `server` key inside the `data` property of the event.
//
// It also emits an error event that contains the error information on
// the `error` key inside the `data` property of the event.
const TomatoSauce = class TomatoSauce extends EventEmitter {
constructor (config) {
super();
this.screens = [];
this.renderers = [];
Object.assign(this, config || {});
}
// Here's where things get started.
run () {
this._startServer();
this._bindEvents();
}
// Creates a socket, server based on the configuration. Emits the
// listening event when ready.
_startServer () {
const server = Net.createServer();
this.server = server;
server.listen(this.port, function () {
this.emit('listening', {
data: {
server: server
}
});
}.bind(this));
}
_bindEvents () {
// Send the error event all the way up.
this.server.on('error', function (err) {
this.emit('error', {
data: {
error: err
}
});
}.bind(this));
// Send the error event all the way up.
this.server.on('connection', function (socket) {
this._renderScreen(socket);
}.bind(this));
}
// Obtains viewport size, and initializes a random screen with a random
// renderer, setting the required interval to draw.
_renderScreen (socket) {
let connectionData = {
width: null,
height: null,
modulation: 0,
screen: this._getScreen(),
renderer: this._getRenderer(),
socket: socket
};
let interval = null;
socket.write(kNAWSRequest);
socket.on('data', function (data) {
if (data.slice(0, 6).compare(kNAWSResponse) === 0) {
connectionData.width = Util.parse16BitBuffer(data.slice(6, 8));
connectionData.height = Util.parse16BitBuffer(data.slice(8, 10));
socket.write('\x1B[2J'); // Clear the Screen (CSI 2 J)
interval = setInterval(this._writeMessage.bind(this, connectionData), this.frequency);
}
if (data.compare(kEscape) === 0) {
socket.write('\n');
clearInterval(interval);
socket.end();
}
}.bind(this));
}
// Resets the cursor, gets a frame and sends it to the socket.
_writeMessage (connectionData) {
let payload = connectionData.screen(connectionData.modulation, connectionData.width, connectionData.height, connectionData.renderer);
let message = `\x1B[1;1H${payload}`; // reset cursor position before payload
connectionData.modulation = (connectionData.modulation + this.modulation) % 256;
connectionData.socket.write(message);
}
_getScreen () {
return Util.pickRandom(this.screens);
}
_getRenderer () {
return Util.pickRandom(this.renderers);
}
};
// Defaults.
TomatoSauce.prototype.port = 9999;
TomatoSauce.prototype.frequency = 333;
TomatoSauce.prototype.modulation = 5;
module.exports = TomatoSauce;
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