sinatra, omniauth, and datamapper

app.rb

%w(rubygems oa-oauth dm-core dm-sqlite-adapter dm-migrations sinatra).each { |dependency| require dependency }

DataMapper.setup(:default, "sqlite3://#{Dir.pwd}/database.db")

class User
  include DataMapper::Resource
  property :id,         Serial
  property :uid,        String
  property :name,       String
  property :nickname,   String
  property :created_at, DateTime
end

DataMapper.finalize
DataMapper.auto_upgrade!

# You'll need to customize the following line. Replace the CONSUMER_KEY 
#   and CONSUMER_SECRET with the values you got from Twitter 
#   (https://dev.twitter.com/apps/new).
use OmniAuth::Strategies::Twitter, 'Kp9THFHyOduYm3p8BrLQQ', 'f3kkG47FzMCvh45ee5ddBFwHW7QSzfb479z0JTehrR4'

enable :sessions

helpers do
  def current_user
    @current_user ||= User.get(session[:user_id]) if session[:user_id]
  end
end

get '/' do
  if current_user
    # The following line just tests to see that it's working.
    #   If you've logged in your first user, '/' should load: "1 ... 1";
    #   You can then remove the following line, start using view templates, etc.
    current_user.id.to_s + " ... " + session[:user_id].to_s 
    '<h1>THIS SHIT IS FUCKING WORKING!!!!</h1>'
  else
    '<a href="/sign_up">create an account</a> or <a href="/sign_in">sign in with Twitter</a>'
    # if you replace the above line with the following line, 
    #   the user gets signed in automatically. Could be useful. 
    #   Could also break user expectations.
    # redirect '/auth/twitter'
  end
end

#get '/auth/:provider/callback' do
#  auth = request.env['omniauth.auth']
#  #"Hello, #{auth['user_info']['name']}, you logged in via #{params['provider']}."
#  redirect '/'
#end

get '/auth/:provider/callback' do
  auth = request.env["omniauth.auth"]
  user = User.first_or_create({ :uid => auth["uid"]}, {
    :uid => auth["user_info"]["uid"],
    :nickname => auth["user_info"]["nickname"], 
    :name => auth["user_info"]["name"],
    :created_at => Time.now })
  session[:user_id] = user.id
  redirect '/'
end

# any of the following routes should work to sign the user in: 
#   /sign_up, /signup, /sign_in, /signin, /log_in, /login
["/sign_in/?", "/signin/?", "/log_in/?", "/login/?", "/sign_up/?", "/signup/?"].each do |path|
  get path do
    redirect '/auth/twitter'
  end
end

# either /log_out, /logout, /sign_out, or /signout will end the session and log the user out
["/sign_out/?", "/signout/?", "/log_out/?", "/logout/?"].each do |path|
  get path do
    session[:user_id] = nil
    redirect '/'
  end
end

get '/auth/failure' do
  "Fail World"
end

Gemfile

source :rubygems

gem 'foreman'
gem 'oa-oauth'
gem 'dm-core'
gem 'dm-sqlite-adapter'
gem 'dm-migrations'
gem 'rack', "~> 1.3.6"
gem 'sinatra'
gem 'thin'