Initial

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in google_auth.gemspec
+gemspec

README.md

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+# GoogleAuth
+
+## What
+
+GoogleAuth is a convenience wrapper around `omniauth-google-apps` that
+makes a lot of assumptions, and requires less setup.
+
+## How
+
+    # Gemfile
+    gem 'google_auth'
+
+    # config/initializers/google_auth.rb
+    Rails.application.config.google_auth.domain = 'yourgoogleappsdomain.com'
+    # other options: 'user_class', 'path'. See source for details.
+
+    # Whichever controller you want behind the login-wall
+    include GoogleAuth::Controller
+

Rakefile

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+require "bundler/gem_tasks"

app/controllers/sessions_controller.rb

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+class SessionsController < ApplicationController
+  skip_before_filter :ensure_authenticated
+
+  def new
+    redirect_to '/auth/g'
+  end
+
+  def create
+    if auth = request.env['omniauth.auth']
+      user = User.find_or_initialize_by_email(auth['info']['email'])
+      user.uid = auth['uid']
+      user.name = auth['info']['name']
+      user.save!
+
+      session[:user_id] = user.id
+      redirect_to session[:redirect] || root_url
+    else
+      render '/auth/failure'
+    end
+  end
+
+  def failure
+    render :inline => 'Snowman says no. <div id="snowman" style="text-align:center; font-size:4000%;">&#9731;</div>'
+  end
+end
+

config/routes.rb

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+GoogleAuth::Engine.routes.draw do
+  match '/login', :to => 'sessions#new', :as => :login
+  match '/auth/g/callback', :to => 'sessions#create'
+  match '/auth/failure', :to => 'sessions#failure'
+end

google_auth.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "google_auth/version"
+
+Gem::Specification.new do |s|
+  s.name        = "google_auth"
+  s.version     = GoogleAuth::VERSION
+  s.authors     = ["Burke Libbey"]
+  s.email       = ["burke.libbey@shopify.com"]
+  s.homepage    = ""
+  s.summary     = %q{Convenience wrapper of omniauth-google-apps}
+  s.description = %q{Convenience wrapper for omniauth-google-apps: Makes a lot of assumptions, requires less configuration.}
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+
+  s.add_runtime_dependency 'omniauth-google-apps'
+end

lib/google_auth.rb

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+require 'google_auth/version'
+require 'google_auth/engine'
+require 'google_auth/controller'
+
+module GoogleAuth
+
+  def self.domain
+    Rails.application.config.google_auth.domain or
+      raise "domain missing! Add config.google_auth.domain to an initializer."
+  end
+
+  def self.path
+    Rails.application.config.google_auth.path or
+      'g'
+  end
+
+  def self.user_class
+    klass = Rails.application.config.google_auth.path
+    return klass if klass
+
+    begin
+      User
+    rescue
+      raise "User class not found! Add config.google_auth.user_class to an initializer."
+    end
+  end
+
+end

lib/google_auth/controller.rb

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+module GoogleAuth
+  module Controller
+
+    def self.included(base)
+      base.send(:before_filter, :ensure_authenticated)
+      base.send(:helper_method, :current_user)
+    end
+
+    def current_user
+      @current_user ||= begin
+        GoogleAuth.user_class.find_by_id(session[:user_id]) if session[:user_id]
+      end
+    end
+
+    def ensure_authenticated
+      unless current_user
+        session[:redirect] = request.fullpath
+        redirect_to(login_path)
+      end
+    end
+
+  end
+end

lib/google_auth/engine.rb

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+require 'omniauth-google-apps'
+require 'openid/store/filesystem'
+
+module GoogleAuth
+  class Engine < ::Rails::Engine
+
+    config.google_auth = ActiveSupport::OrderedOptions.new
+
+    initializer 'google_auth' do |app|
+      # OpenID.fetcher.ca_file = 'vendor/ca-bundle.crt'
+      app.middleware.use OmniAuth::Builder do
+        provider :google_apps,
+          store: OpenID::Store::Filesystem.new('./tmp'),
+          name: GoogleAuth.path,
+          domain: GoogleAuth.domain
+      end
+    end
+  end
+end

lib/google_auth/version.rb

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+module GoogleAuth
+  VERSION = "0.0.1"
+end