Sinatra app Authenticating with Viki API

app.rb

require 'rubygems'
require 'bundler'
Bundler.require(:default)

enable :sessions

# Register your application at http://www.viki.com/applications
# to get the application_id and application_secret
# The callback url is /auth/test/callback
def client
  OAuth2::Client.new("application_id", "application_secret", :site => "http://viki.com/oauth/token")
end

get "/auth/test" do
  redirect client.auth_code.authorize_url(:redirect_uri => redirect_uri)
end

get '/auth/test/callback' do
  access_token = client.auth_code.get_token(params[:code], :redirect_uri => redirect_uri)
  session[:access_token] = access_token.token
  @message = "Successfully authenticated with the server"
  erb :success
end

get '/movies' do
  @movies = get_response('movies.json')
  erb :movies
end

def get_response(url)
  access_token = OAuth2::AccessToken.new(client, session[:access_token])
  JSON.parse(access_token.get("/api/v3/#{url}").body)
end

def redirect_uri
  uri = URI.parse(request.url)
  uri.path = '/auth/test/callback'
  uri.query = nil
  uri.to_s
end

get "/" do
  'Start with /auth/test'
end

config.ru

require "./app"
run Sinatra::Application

Gemfile

source :rubygems

gem 'sinatra'
gem 'oauth2'
gem 'json'

group :test do
  gem 'rspec'
  gem 'rack-test'
end

movies.erb

<%= @movies.inspect %>

spec_helper.rb

require File.join(File.dirname(__FILE__), '../app')

require 'rubygems'
require 'bundler'
Bundler.setup(:default, :test)
require 'rack/test'

set :environment, :test
set :run, false
set :raise_erros, true
set :logging, false

def app
  Sinatra::Application
end

RSpec.configure do |config|
  config.include(Rack::Test::Methods)
end

success.erb

# Put this file inside views folder

Success authentication!

<%= @message.inspect %>