Use lambdas

sinatra-bp-p1-lambas.rb

########
# app.rb
#

require 'sinatra/base'

class SimpleApp < Sinatra::Base

  set :root, File.dirname(__FILE__)

  enable :sessions

  def require_logged_in
    redirect('/sessions/new') unless is_authenticated?
  end

  def is_authenticated?
    return !!session[:user_id]
  end

  show_login = lambda do
    erb :login
  end

  receive_login = lambda do
    session[:user_id] = params["user_id"]
    redirect '/secrets'
  end

  show_secrets = lambda do
    require_logged_in
    erb :secrets
  end

  get  '/', &show_login
  get  '/sessions/new', &show_login
  post '/sessions', &receive_login
  get  '/secrets', &show_secrets

end