Adds first working example with Twitter strategy.

.gitignore

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+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp

Gemfile

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+source 'http://rubygems.org'
+
+# Specify your gem's dependencies in omniauth-contrib.gemspec
+gem 'omniauth', :git => 'git://github.com/intridea/omniauth.git'
+gem 'omniauth-oauth', :git => 'git://github.com/intridea/omniauth-oauth.git'
+
+gemspec
+
+group :example do
+  gem 'sinatra'
+end

Rakefile

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+#!/usr/bin/env rake
+require "bundler/gem_tasks"

examples/sinatra.rb

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+require 'rubygems'
+require 'bundler'
+
+Bundler.setup :default, :development, :example
+require 'sinatra'
+require 'omniauth'
+require 'omniauth-contrib'
+
+use Rack::Session::Cookie
+
+use OmniAuth::Builder do
+  provider :twitter, ENV['TWITTER_KEY'], ENV['TWITTER_SECRET']
+end
+
+get '/' do
+  <<-HTML
+  <ul>
+    <li><a href='/auth/twitter'>Sign in with Twitter</a></li>
+  </ul>
+  HTML
+end
+
+get '/auth/:provider/callback' do
+  content_type 'text/plain'
+  request.env['omniauth.auth'].inspect
+end

lib/omniauth-contrib.rb

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+require "omniauth-contrib/version"
+
+module OmniAuth
+  module Strategies
+    autoload :Twitter, 'omniauth/strategies/twitter'
+  end
+end

lib/omniauth-contrib/version.rb

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+module OmniAuth
+  module Contrib
+    VERSION = "0.0.1"
+  end
+end

lib/omniauth/strategies/twitter.rb

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+require 'omniauth-oauth'
+require 'multi_json'
+
+module OmniAuth
+  module Strategies
+    class Twitter < OmniAuth::Strategies::OAuth
+      option :name, 'twitter'
+      option :client_options, {:site => 'https://api.twitter.com'}
+      option :sign_in, true
+      option :force_sign_in, false
+
+      def initialize(*args)
+        super
+        options.client_options[:authorize_path] = '/oauth/authenticate' if options.sign_in?
+        options.authorize_params[:force_sign_in] = 'true' if options.force_sign_in?
+      end
+
+      def uid
+        access_token.params[:user_id]
+      end
+
+      def info
+        {
+          :nickname => raw_info['screen_name'],
+          :name => raw_info['name'],
+          :location => raw_info['location'],
+          :image => raw_info['profile_image_url'],
+          :description => raw_info['description'],
+          :urls => {
+            'Website' => raw_info['url'],
+            'Twitter' => 'http://twitter.com/' + raw_info['screen_name'],
+          }
+        }
+      end
+
+      def raw_info
+        @raw_info ||= MultiJson.decode(access_token.get('/1/account/verify_credentials.json').body)
+      rescue ::Errno::ETIMEDOUT
+        raise ::Timeout::Error
+      end
+    end
+  end
+end

omniauth-contrib.gemspec

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+# -*- encoding: utf-8 -*-
+require File.expand_path('../lib/omniauth-contrib/version', __FILE__)
+
+Gem::Specification.new do |gem|
+  gem.add_dependency 'omniauth', '~> 1.0.0.alpha'
+  gem.add_dependency 'omniauth-oauth', '~> 1.0.0.alpha'
+  gem.add_dependency 'multi_json'
+
+  gem.authors       = ["TODO: Write your name"]
+  gem.email         = ["michael@intridea.com"]
+  gem.description   = %q{TODO: Write a gem description}
+  gem.summary       = %q{TODO: Write a gem summary}
+  gem.homepage      = ""
+
+  gem.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  gem.files         = `git ls-files`.split("\n")
+  gem.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  gem.name          = "omniauth-contrib"
+  gem.require_paths = ["lib"]
+  gem.version       = OmniAuth::Contrib::VERSION
+end