Sinatra Dropbox Oauth

gistfile1.rb

require 'rubygems'
require 'erb'
require 'sinatra'
require 'dropbox'

  configure do
    enable :sessions
  end

  def authed?
    redirect '/login' unless session[:dropbox_session]
    dropbox_session = Dropbox::Session.deserialize(session[:dropbox_session])
    redirect '/login' unless dropbox_session.authorized?
  end

  get '/' do
    erb :index
  end
  
  get '/admin' do
    authed?
    erb :admin
  end

  get '/login' do
    if params[:oauth_token] then
       dropbox_session = Dropbox::Session.deserialize(session[:dropbox_session])
       dropbox_session.authorize(params)
       session[:dropbox_session] = dropbox_session.serialize # re-serialize the authenticated session

       redirect '/admin'
     else
       dropbox_session = Dropbox::Session.new('app_key', 'app_secret')
       session[:dropbox_session] = dropbox_session.serialize
       redirect dropbox_session.authorize_url(:oauth_callback => "#{@env['rack.url_scheme']}://#{request.host_with_port}/login")
     end
   end