Ssh-chat, part 2

Hello, Habr. This is article 2 of the ssh-chat loop.

What we will do:

• Add the ability to create your own design functions
• Add markdown support
• Add bot support
• Increase password security (hash and salt)
  
  Alas, there will be no sending files

Custom layout features

Currently implemented support for the following design features:

• @color
  
  
  
  
• @bold
  
  
  
  
• @underline
  
  
  
  
• @hex
  
  
  
  
• @box
  
  
  
  
  
  But it’s worth adding the ability to create your own functions:
  
  All functions are stored in an methods
  
  
  
  
  
  So it will be enough to create the registerMethod
  
  
  
  function:

 // parserExec.js at end module.exports.registerMethod = function(name, func) { methods[name] = func }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

You also need to return this method after creating the server.

 // index.js at require part const { registerMethod } = require('./parserExec') // index.js at end module.exports.registerMethod = registerMethod
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

Now, when creating a server, we can register formatting methods. Example:

 const chat = require('.') const { formatNick } = require('./format') chat({}) chat.registerMethod('hello', function(p, name){ return 'Hi, ' + formatNick(name) + '!' })
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

Markdown support

Markdown is very convenient, so add it using marked terminal

 // format.js near require const marked = require('marked'); const TerminalRenderer = require('marked-terminal'); marked.setOptions({ renderer: new TerminalRenderer() }); // format.js line 23 message = marked(message)
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

Bots

How it will work

 let writeBotBob = chat.registerBot({ name: 'botBob', onConnect(nick, write){ write('@hello{' + nick + '}') }, onDisconnect(nick, write){}, onMessage(nick, message, write) { if(message == 'botBob!') write('I\'m here') }, onCommand(command, write) { write('Doing ' + command) } })
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

onCommand



can be called using @bot(botBob){Command}

Everything for working with bots is described in the file:

 let bots = []; //   let onWrite = () => {}; function getWrite(bot) { //       return msg => { onWrite(bot.name, msg); }; } module.exports.message = function message(nick, message) { // index.js       bots.forEach(bot => { try { bot.onMessage(nick, message, getWrite(bot)); } catch (e) { console.error(e); } }); }; module.exports.connect = function message(nick) { //   bots.forEach(bot => { try { bot.onConnect(nick, getWrite(bot)); } catch (e) { console.error(e); } }); }; module.exports.disConnect = function message(nick) { //   bots.forEach(bot => { try { bot.onDisconnect(nick, message, getWrite(bot)); } catch (e) { console.error(e); } }); }; module.exports.command = function message(name, message) { //    bots.forEach(bot => { if (bot.name == name) { try { bot.onCommand(message, getWrite(bot)); } catch (e) { console.error(e); } } }); }; module.exports.registerBot = function(bot) { bots.push(bot); return getWrite(bot) }; module.exports.onMessage = func => { onWrite = func; };
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

What can be done with bots:

• Load monitor
• Deploy
• Task board

Hash and salt

Why not ssh keys? Because ssh keys will be different on different devices

Create a file in which will be responsible for checking and creating passwords

 // crypto.js const crypto = require('crypto'); function genRandomString(length) { return crypto .randomBytes(Math.ceil(length / 2)) .toString('hex') .slice(0, length); } function sha512(password, salt){ const hash = crypto.createHmac('sha512', salt); /** Hashing algorithm sha512 */ hash.update(password); const value = hash.digest('hex'); return value }; function checkPass(pass, obj){ return obj.password == sha512(pass, obj.salt) } function encodePass(pass){ const salt = genRandomString(16) return JSON.stringify({ salt, password: sha512(pass, salt) }) } module.exports.encodePass = encodePass module.exports.checkPass = checkPass
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

Also a script for salting and hashing a password

 // To generate password run node ./encryptPassword password const { encodePass } =require('./crypto') console.log(encodePass(process.argv[2]))
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

We update in users.json and instead of comparison in lobby.js we use checkPassword

Total

As a result, we have ssh chat with design capabilities and bots.

Final repository