gistfile1.rb

# cut out of a real app, so a bit bastardised and probably wouldn't run as it's own Sinatra app, but I think it pretty much covers the entire process of Twitter OAuth

require 'sinatra'
gem 'oauth'
require 'oauth/consumer'

module Twitter
  class Application < Sinatra::Application                         
    
    enable :sessions
    set :site_root, '/'

    def do_oauth_dance
      @request_token = @consumer.get_request_token(:oauth_callback => "http://app.local/signup")
      session[:request_token] = @request_token.token
      session[:request_token_secret] = @request_token.secret
    end

    before do
      @consumer = OAuth::Consumer.new "consumer-key", "consumer-secret", {:site=>"http://twitter.com"}
    end

    get '/' do
      do_oauth_dance
      haml :index
    end

    get '/signup' do
      @access_token = OAuth::RequestToken.new(@consumer, session[:request_token], session[:request_token_secret]).get_access_token(:oauth_verifier =>params[:oauth_verifier])
      session[:access_token] = @access_token
      @user = User.new
      haml :signup
    end
    post '/create' do
      @user = User.new(params[:user])
      @user.twitter_screen_name = session[:access_token][:screen_name]
      @user.twitter_user_id = session[:access_token][:user_id]
      @user.twitter_oauth_token = session[:access_token][:oauth_token]
      @user.twitter_oauth_token_secret = session[:access_token][:oauth_token_secret]

      if @user.valid? && @user.save!
        redirect "/thank-you"
      else
        haml :signup
      end
    end
  end
end