Adds Facebook sign-in / registration

Fixes #222 (as far as Facebook at least)

This was fairly straightforward with a few hiccups. I implemented Facebook because that is the one in the tutorial. I attempted to move some other stuff around (`RegistrationsController`) to match the submodule approach.

Things it does not support

- [ ] Newsletter preference (isn't passed through)
- [ ] Group invitation code (personalized group code)
- [ ] Group signup code (the group "public" signup code)
- [ ] Entity registration (skip search for team in group creation)

.env-dist

@@ -16,6 +16,9 @@ export TWILIO_ACCOUNT_SID=some_sid
 export TWILIO_AUTH_TOKEN=some_token
 export TWILIO_OUTBOUND_NUMBER=the_number
 
+export OMNIAUTH_FACEBOOK_APP_ID=the_app_id
+export OMNIAUTH_FACEBOOK_APP_SECRET=the_app_secret
+
 export SLACK_WEBHOOK_URL=webook_url
 
 # These values are production only

Gemfile

@@ -60,6 +60,9 @@ gem 'newrelic_rpm', group: :production
 # Select2
 gem 'select2-rails'
 
+# OmniAuth
+gem 'omniauth-facebook'
+
 # ActiveAdmin
 gem 'activeadmin', github: 'activeadmin'
 

Gemfile.lock

@@ -127,6 +127,8 @@ GEM
     eventmachine (1.0.8)
     excon (0.45.4)
     execjs (2.5.2)
+    faraday (0.9.1)
+      multipart-post (>= 1.2, < 3)
     ffi (1.9.10)
     font-awesome-rails (4.4.0.0)
       railties (>= 3.2, < 5.0)
@@ -170,6 +172,7 @@ GEM
     has_scope (0.6.0)
       actionpack (>= 3.2, < 5)
       activesupport (>= 3.2, < 5)
+    hashie (3.4.2)
     hike (1.2.3)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
@@ -217,6 +220,7 @@ GEM
       railties (>= 3.1)
     multi_json (1.11.2)
     multi_xml (0.5.5)
+    multipart-post (2.0.0)
     nenv (0.2.0)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
@@ -228,6 +232,20 @@ GEM
     notiffany (0.0.7)
       nenv (~> 0.1)
       shellany (~> 0.0)
+    oauth2 (1.0.0)
+      faraday (>= 0.8, < 0.10)
+      jwt (~> 1.0)
+      multi_json (~> 1.3)
+      multi_xml (~> 0.5)
+      rack (~> 1.2)
+    omniauth (1.2.2)
+      hashie (>= 1.2, < 4)
+      rack (~> 1.0)
+    omniauth-facebook (2.0.1)
+      omniauth-oauth2 (~> 1.2)
+    omniauth-oauth2 (1.3.1)
+      oauth2 (~> 1.0)
+      omniauth (~> 1.2)
     orm_adapter (0.5.0)
     paperclip (4.2.4)
       activemodel (>= 3.2.0)
@@ -404,6 +422,7 @@ DEPENDENCIES
   mailchimp-api (~> 2.0.5)
   momentjs-rails
   newrelic_rpm
+  omniauth-facebook
   paperclip (~> 4.2.1)
   pg
   pry-nav

app/assets/stylesheets/login.css.scss

@@ -56,7 +56,18 @@ body.login {
 
   }
 
-  div.logo {
+  .facebook_signin {
+    margin-bottom: 1.5em;
+    i {
+      margin-right: 1em;
+    }
+    a, a:hover {
+      color: #fff;
+      text-decoration: none;
+    }
+  }
+
+  .logo {
     background-image: image-url('seatshare-inverted.svg');
     background-repeat: no-repeat;
     background-position: center;
@@ -67,11 +78,13 @@ body.login {
     margin-left: auto;
     margin-right: auto;
     overflow-y: hidden;
-  }
 
-  div.logo a {
-    display: block;
-    width: 290px;
-    padding-top: 100px;
+    a {
+      display: block;
+      width: 290px;
+      padding-top: 100px;
+    }
+
   }
+
 }

app/assets/stylesheets/registrations.css.scss

@@ -0,0 +1,9 @@
+.facebook_register {
+  text-align:center;
+  margin: 3em 0;
+  a {
+    i {
+      margin-right: 2em;
+    }
+  }
+}

app/controllers/users/omniauth_callbacks_controller.rb

@@ -0,0 +1,20 @@
+##
+# Users :: OminiAuth Callbacks Controller
+module Users
+  ##
+  # Users :: OminiAuth Callbacks Controller
+  class OmniauthCallbacksController < Devise::OmniauthCallbacksController
+    def facebook
+      @user = User.from_omniauth(request.env['omniauth.auth'])
+      if @user.persisted?
+        sign_in_and_redirect @user
+        set_flash_message(
+          :notice, :success, kind: 'Facebook'
+        ) if is_navigational_format?
+      else
+        session['devise.facebook_data'] = request.env['omniauth.auth']
+        redirect_to new_user_registration_url
+      end
+    end
+  end
+end