gistfile1.txt

add gem omniauth-twitter
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initialization file:
OmniAuth.config.logger = Rails.logger

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :twitter, ENV['TW_CON_KEY'], ENV['TW_CON_SEC']
end

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routing:
match '/auth/:provider/callback' => 'sessions#create'
match '/auth/failure' => redirect('/')
match '/signout' => 'sessions#destroy'

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session controller:
def create
  user = User.from_omniauth(env["omniauth.auth"])
  # save user id in session
  # redirect to home
end

def destroy
  # set id to nil
  # redirect to home
end

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user model:
def self.from_omniauth(auth)
  where(auth.slice("provider", "uid")).first || create_from_omniauth(auth)
end

def self.create_from_omniauth(auth)
  # create a new user, save provider, uid and name/nickname
end