authorization_request_sample.rb

require 'rubygems'
require 'rack/oauth2'

client = Rack::OAuth2::Client.new(
  :identifier => YOUR_CLIENT_ID,
  :secret => YOUR_CLIENT_SECRET,
  :redirect_uri => YOUR_REDIRECT_URI, # only required for grant_type = :code
  :host => 'rack-oauth2-sample.heroku.com'
)

request_type = :token

puts "## request_type = :#{request_type}"

authorization_uri = case request_type
when :code
  client.authorization_uri(:scope => :user_about_me)
when :token
  client.authorization_uri(:response_type => :token, :scope => :user_about_me)
end

puts authorization_uri