nodejs server chat

gistfile1.coffee

#server

logins = []

io.sockets.on 'connection', (client) ->

    client.on 'join', (data) ->
        # checks if data.login account exists
        db.users.findOne {login: data.login}, (err, user) -> 
            # user found
            if !err and user
                # AUTHENTIFICATION (strong)
                if user.password is sha1(data.password)
                    # mark as online
                    logins.push data.login
                    # send user
                    client.emit 'user', 
                        login: data.login
                        registered: true
                else 
                    # error
                    client.emit 'error', 'login registered'
            # user not found
            # AUTHENTIFICATION (weak)
            else
                # mark as online
                logins.push data.login
                # send user
                client.emit 'user', 
                    login: data.login
                    registered: false
    
    client.on 'register', (data) ->
        # checks for user account
        db.users.findOne {login: data.login}, (err, user) ->
            # user exists
            if !err and user
                # error
                client.emit 'error', 'login registered'
            # user does not exist
            # AUTHENTIFICATION (strong)
            else
                # save user
                db.users.save
                    login: data.login
                    password: (data.password)
                    email: data.email
                    registered: true
                # mark as online
                logins.push data.login
                # send user
                client.emit 'user', 
                    login: data.login
                    registered: true
        
    client.on 'send msg', (data) ->
        if data.login in logins
            # msg added
        else
            # error
            client.emit 'error', 'need connection'