Add Facebook login with Sorcery

The facebook key and secret defined in the sorcery config file are for
testing only and need to be changed and not committed to source when
app is ready to go live

app/assets/javascripts/oauths.js.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/oauths.css.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the Oauths controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/oauths_controller.rb

@@ -0,0 +1,32 @@
+class OauthsController < ApplicationController
+  skip_before_filter :require_login
+
+  # sends the user on a trip to the provider,
+  # and after authorizing there back to the callback url.
+  def oauth
+    login_at(auth_params[:provider])
+  end
+
+  def callback
+    provider = auth_params[:provider]
+    if @user = login_from(provider)
+      redirect_to root_path, :notice => "Logged in with #{provider.titleize}!"
+    else
+      begin
+        @user = create_from(auth_params[:provider])
+
+        reset_session
+        auto_login(@user)
+        redirect_to root_path, :notice => "Signed up with #{provider.titleize}!"
+      rescue
+        redirect_to root_path, :alert => "Failed to login with #{provider.titleize}!"
+      end
+    end
+  end
+
+  private
+  def auth_params
+    params.permit(:code, :provider)
+  end
+
+end

app/helpers/oauths_helper.rb

@@ -0,0 +1,2 @@
+module OauthsHelper
+end

app/models/authentication.rb

@@ -0,0 +1,3 @@
+class Authentication < ActiveRecord::Base
+  belongs_to :user
+end

app/models/user.rb

@@ -1,5 +1,7 @@
 class User < ActiveRecord::Base
-	authenticates_with_sorcery!
+	authenticates_with_sorcery! do |config|
+    config.authentications_class = Authentication
+  end
 
 	validates :password, presence: true, confirmation: true, length: { minimum: 3 }, unless: ("id?" || "password_confirmation?")
 	validates :password_confirmation, presence: true, unless: ("id?" || "password?")
@@ -16,5 +18,7 @@ class User < ActiveRecord::Base
 
 	has_many :user_organization_relationships
 	has_many :organizations, through: :user_organization_relationships
+  has_many :authentications, :dependent => :destroy
+  accepts_nested_attributes_for :authentications
 
 end

app/views/oauths/callback.html.haml

@@ -0,0 +1,2 @@
+%h1 Oauths#callback
+%p Find me in app/views/oauths/callback.html.haml

app/views/oauths/oauth.html.haml

@@ -0,0 +1,2 @@
+%h1 Oauths#oauth
+%p Find me in app/views/oauths/oauth.html.haml

app/views/user_sessions/new.html.haml

@@ -8,4 +8,6 @@
 			Create an Account
 		%p
 			#{_ 'user.why_register', 'paragraph'}
+			= link_to 'Login with Facebook', auth_at_provider_path(:provider => :facebook)
 			= render '/users/form'
+