Sinatra auth app

app.rb

require 'bcrypt'
require 'sinatra'
require 'sequel'

database = Sequel.connect("sqlite://db.sqlite")


###
#database.create_table :users do 
#    primary_key :id 
#    String :username 
#    String :password 
#end 
###
users = database[:users]

def hash_password(password)
    BCrypt::Password.create(password).to_s
end 

def test_password(password, hash)
    BCrypt::Password.new(hash) == password
end

#User = Struct.new(:id, :username, :password_hash)

#Users = [User.new(1, "user", hash_password("1234"))]

#### Sinatra Code Begins Here ####

enable :sessions

helpers do
    def current_user
        if session[:user_id]
            users.where(:id => session[:user_id]).get(:id) == session[:user_id]
        else
            nil
        end
    end
end


get '/' do 
    if current_user 
        "Hello!"
    else 
        "Not logged in"
    end 
end 

get '/login' do 
    erb :login 
end 

post '/login' do 
    #user = Users.find { |u| u.username == params[:username] }
    pass = hash_password(users.where(:username => params[:username]).get(:password))
    if test_password(hash_password(params[:password]), pass)
        user = users.where(:username => params[:username]).get(:id)
        puts user 
        session.clear
        session[:user_id] = user
        redirect '/'
    end 
end 

get '/signup' do 
    erb :signup 
end 

post '/signup' do 
    if params[:password]
        users.insert(:username => params[:username], :password => hash_password(params[:password]))
        redirect '/'
    else 
        redirect '/signup'
    end
end 

get '/logout' do
    session.clear
    redirect '/'
end