twitter-auth.rb

require 'sinatra'
require 'sinatra/reloader'
require 'omniauth-twitter'

configure do
	enable :sessions
	user OmniAuth::Builder do
		provider :twitter, ENV['CONSUMER_KEY'], ENV['CONSUMER_SECRET']
	end
end

get '/' do
	@uname = session[:uname]
	erb :index
end

get '/auth/twitter/callback' do
	session[:uname] = env['omniauth-twitter']['extra']['raw_info']['screen_name'].inspect
	erb :callback
end