NDOJ/websocket/wscat.js

#!/usr/bin/env node

/*!
 * ws: a node.js websocket client
 * Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var WebSocket = require('ws')
  , fs = require('fs')
  , program = require('commander')
  , util = require('util')
  , events = require('events')
  , readline = require('readline');

/**
 * InputReader - processes console input
 */

function Console() {
  this.stdin = process.stdin;
  this.stdout = process.stdout;

  this.readlineInterface = readline.createInterface(this.stdin, this.stdout);

  var self = this;
  this.readlineInterface.on('line', function(data) {
    self.emit('line', data);
  });
  this.readlineInterface.on('close', function() {
    self.emit('close');
  });

  this._resetInput = function() {
    self.clear();
  }
}
util.inherits(Console, events.EventEmitter);

Console.Colors = {
  Red: '\033[31m',
  Green: '\033[32m',
  Yellow: '\033[33m',
  Cyan: '\033[36m',
  Blue: '\033[34m',
  Default: '\033[39m'
};

Console.prototype.prompt = function() {
  this.readlineInterface.prompt();
}

Console.prototype.print = function(msg, color) {
  this.clear();
  color = color || Console.Colors.Default;
  this.stdout.write(color + msg + Console.Colors.Default + '\n');
  this.prompt();
}

Console.prototype.clear = function() {
  this.stdout.write('\033[2K\033[E');
}

Console.prototype.pause = function() {
  this.stdin.on('keypress', this._resetInput);
}

Console.prototype.resume = function() {
  this.stdin.removeListener('keypress', this._resetInput);
}

function appender(xs) {
  xs = xs || [];
  return function (x) {
    xs.push(x);
    return xs;
  }
}

function into(obj, kvals) {
  kvals.forEach(function (kv) {
    obj[kv[0]] = kv[1];
  });
  return obj;
}

function splitOnce(sep, str) { // sep can be either String or RegExp
  var tokens = str.split(sep);
  return [tokens[0], str.replace(sep, '').substr(tokens[0].length)];
}

/**
 * The actual application
 */

var version = '1.0';//JSON.parse(fs.readFileSync(__dirname + '/../package.json', 'utf8')).version;
program
  .version(version)
  .usage('[options] <url>')
  .option('-l, --listen <port>', 'listen on port')
  .option('-c, --connect <url>', 'connect to a websocket server')
  .option('-p, --protocol <version>', 'optional protocol version')
  .option('-o, --origin <origin>', 'optional origin')
  .option('--host <host>', 'optional host')
  .option('-s, --subprotocol <protocol>', 'optional subprotocol')
  .option('-n, --no-check', 'Do not check for unauthorized certificates')
  .option('-H, --header <header:value>', 'Set an HTTP header. Repeat to set multiple. (--connect only)', appender(), [])
  .option('--auth <username:password>', 'Add basic HTTP authentication header. (--connect only)')
  .parse(process.argv);

if (program.listen && program.connect) {
  console.error('\033[33merror: use either --listen or --connect\033[39m');
  process.exit(-1);
}
else if (program.listen) {
  var wsConsole = new Console();
  wsConsole.pause();
  var options = {};
  if (program.protocol) options.protocolVersion = program.protocol;
  if (program.origin) options.origin = program.origin;
  if (program.subprotocol) options.protocol = program.subprotocol;
  if (!program.check) options.rejectUnauthorized = program.check;
  var ws = null;
  var wss = new WebSocket.Server({port: program.listen}, function() {
    wsConsole.print('listening on port ' + program.listen + ' (press CTRL+C to quit)', Console.Colors.Green);
    wsConsole.clear();
  });
  wsConsole.on('close', function() {
    if (ws) {
      try {
        ws.close();
      }
      catch (e) {}
    }
    process.exit(0);
  });
  wsConsole.on('line', function(data) {
    if (ws) {
      ws.send(data, {mask: false});
      wsConsole.prompt();
    }
  });
  wss.on('connection', function(newClient) {
    if (ws) {
      // limit to one client
      newClient.terminate();
      return;
    };
    ws = newClient;
    wsConsole.resume();
    wsConsole.prompt();
    wsConsole.print('client connected', Console.Colors.Green);
    ws.on('close', function() {
      wsConsole.print('disconnected', Console.Colors.Green);
      wsConsole.clear();
      wsConsole.pause();
      ws = null;
    });
    ws.on('error', function(code, description) {
      wsConsole.print('error: ' + code + (description ? ' ' + description : ''), Console.Colors.Yellow);
    });
    ws.on('message', function(data, flags) {
      wsConsole.print('< ' + data, Console.Colors.Blue);
    });
  });
  wss.on('error', function(error) {
    wsConsole.print('error: ' + error.toString(), Console.Colors.Yellow);
    process.exit(-1);
  });
}
else if (program.connect) {
  var wsConsole = new Console();
  var options = {};
  if (program.protocol) options.protocolVersion = program.protocol;
  if (program.origin) options.origin = program.origin;
  if (program.subprotocol) options.protocol = program.subprotocol;
  if (program.host) options.host = program.host;
  if (!program.check) options.rejectUnauthorized = program.check;
  var headers = into({}, (program.header || []).map(function (s) {
                                                      return splitOnce(':', s)
                                                    }));
  if (program.auth) {
    headers['Authorization'] = 'Basic ' + new Buffer(program.auth).toString('base64');
  }
  options.headers = headers;
  var ws = new WebSocket(program.connect, options);
  ws.on('open', function() {
    wsConsole.print('connected (press CTRL+C to quit)', Console.Colors.Green);
    wsConsole.on('line', function(data) {
      ws.send(data, {mask: true});
      wsConsole.prompt();
    });
  });
  ws.on('close', function() {
    wsConsole.print('disconnected', Console.Colors.Green);
    wsConsole.clear();
    process.exit();
  });
  ws.on('error', function(code, description) {
    wsConsole.print('error: ' + code + (description ? ' ' + description : ''), Console.Colors.Yellow);
    process.exit(-1);
  });
  ws.on('message', function(data, flags) {
    wsConsole.print('< ' + data, Console.Colors.Cyan);
  });
  wsConsole.on('close', function() {
    if (ws) {
      try {
        ws.close();
      }
      catch(e) {}
      process.exit();
    }
  });
}
else {
  console.error('\033[33merror: use either --listen or --connect\033[39m');
  process.exit(-1);
}