[#9] Added login via GitHub

Gemfile

@@ -7,6 +7,7 @@ gem 'pg'
 gem 'schema_plus'
 ########
 gem 'devise'
+gem 'omniauth-github'
 gem 'pundit'
 gem 'rbtrace'
 

Gemfile.lock

@@ -169,6 +169,7 @@ GEM
       actionpack (>= 3.2, < 5)
       activesupport (>= 3.2, < 5)
     hashdiff (0.3.0)
+    hashie (3.4.2)
     hirb (0.7.3)
     html2haml (2.0.0)
       erubis (~> 2.7.0)
@@ -197,6 +198,7 @@ GEM
       railties (>= 3.2)
       sprockets-rails
     json (1.8.3)
+    jwt (1.5.0)
     kaminari (0.17.0)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
@@ -238,6 +240,7 @@ GEM
       key_struct (~> 0.4)
     msgpack (0.7.6)
     multi_json (1.12.1)
+    multi_xml (0.5.5)
     multipart-post (2.0.0)
     nest (1.1.2)
       redis
@@ -248,6 +251,12 @@ GEM
       rails (>= 3.1)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
+    oauth2 (1.0.0)
+      faraday (>= 0.8, < 0.10)
+      jwt (~> 1.0)
+      multi_json (~> 1.3)
+      multi_xml (~> 0.5)
+      rack (~> 1.2)
     octokit (4.3.0)
       sawyer (~> 0.7.0, >= 0.5.3)
     ohm (1.3.2)
@@ -256,6 +265,15 @@ GEM
       scrivener (~> 0.0.3)
     ohm-expire (0.1.3.2)
       ohm (>= 0.1.5)
+    omniauth (1.2.2)
+      hashie (>= 1.2, < 4)
+      rack (~> 1.0)
+    omniauth-github (1.1.2)
+      omniauth (~> 1.0)
+      omniauth-oauth2 (~> 1.1)
+    omniauth-oauth2 (1.3.0)
+      oauth2 (~> 1.0)
+      omniauth (~> 1.2)
     orm_adapter (0.5.0)
     paperclip (4.3.6)
       activemodel (>= 3.2.0)
@@ -567,6 +585,7 @@ DEPENDENCIES
   octokit (~> 4.0)
   ohm (~> 1.3.2)
   ohm-expire (~> 0.1.3)
+  omniauth-github
   paperclip
   pg
   puma
@@ -612,4 +631,4 @@ DEPENDENCIES
   will_paginate
 
 BUNDLED WITH
-   1.11.2
+   1.13.1

app/controllers/users/omniauth_callbacks_controller.rb

@@ -0,0 +1,53 @@
+class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
+
+  def github
+    oauthorize 'GitHub'
+  end
+
+  def passthru
+    render file: "#{Rails.root}/public/404.html", status: 404, layout: false
+  end
+
+  private
+
+  def oauthorize(kind)
+    provider = kind.downcase
+    @user = find_for_ouath(env["omniauth.auth"], current_user)
+    if @user && @user.persisted?
+      flash[:notice] = I18n.t "devise.omniauth_callbacks.success", kind: action_name.classify
+      sign_in_and_redirect @user, event: :authentication
+    else
+      session["devise.#{provider}_data"] = env["omniauth.auth"]
+      redirect_to new_user_registration_url
+    end
+  end
+
+  def find_for_ouath(auth, resource=nil)
+    provider, uid   = auth['provider'], auth['uid']
+    authentication  = Authentication.find_or_initialize_by(provider: provider, uid: uid)
+    if authentication.new_record?
+      if user_signed_in? # New authentication method for current_user
+        authentication.user = current_user
+      else # Register new user from session
+        case provider
+        when 'github'
+          name = auth['info']['nickname'] || auth['info']['name']
+        else
+          raise ActiveRecord::RecordNotFound
+        end
+        user = User.find_or_initialize_by email: auth['info']['email']
+        if user.new_record?
+          user.name     = name
+          user.uname    = name.gsub(/\s/, '').underscore
+          user.password = Devise.friendly_token[0,20]
+          user.confirmed_at = Time.zone.now
+          user.save
+        end
+        authentication.user = user
+      end
+      authentication.save
+    end
+    return authentication.user
+  end
+
+end

app/models/user.rb

@@ -15,6 +15,7 @@ class User < Avatar
 
   devise :database_authenticatable, :registerable, :recoverable,
          :rememberable, :validatable, :lockable, :confirmable
+  devise :omniauthable, omniauth_providers: %i(github)
 
   has_one :notifier,       class_name: 'SettingsNotifier',  dependent: :destroy #:notifier
   has_one :builds_setting, class_name: 'UserBuildsSetting', dependent: :destroy

app/views/devise/sessions/new.html.slim

@@ -17,3 +17,5 @@
               = f.button :submit, t('layout.devise.shared_links.sign_in')
         .row
           = link_to t('layout.devise.shared_links.forgot_password'), new_password_path(resource_name)
+      rd-widget-footer
+        == render 'devise/shared/providers'

app/views/devise/shared/_providers.slim

@@ -0,0 +1,9 @@
+- if devise_mapping.omniauthable?
+  .row
+    .col-md-12
+      .pull-left
+        = t('.sign_up_with')
+      .pull-right
+        - resource_class.omniauth_providers.each do |provider|
+          a.text-muted> href=omniauth_authorize_path(resource_name, provider)
+            i.fa.fa-2x class="fa-#{provider}-square"

config/initializers/devise.rb

@@ -184,6 +184,7 @@ Devise.setup do |config|
   # Add a new OmniAuth provider. Check the wiki for more information on setting
   # up on your models and hooks.
   # config.omniauth :github, 'APP_ID', 'APP_SECRET', :scope => 'user,public_repo'
+  config.omniauth :github, APP_CONFIG['keys']['github']['id'], APP_CONFIG['keys']['github']['secret'], scope: 'user:email'
 
   # require 'openid/store/filesystem'
   # config.omniauth :openid, :name => 'open_id' #, :store => OpenID::Store::Filesystem.new('./tmp')

config/locales/devise.en.yml

@@ -10,6 +10,9 @@ en:
         other: "%{count} errors prevented %{resource} from being saved:"
 
   devise:
+    shared:
+      providers:
+        sign_up_with: 'or sign in with'
     failure:
       already_authenticated: 'You are already signed in.'
       unauthenticated: 'You need to sign in or sign up before continuing.'

config/locales/devise.ru.yml

@@ -12,6 +12,9 @@ ru:
         other: "%{resource}: сохранение не удалось из-за %{count} ошибки"
 
   devise:
+    shared:
+      providers:
+        sign_up_with: 'или войти с помощью'
     failure:
       already_authenticated: 'Вы уже вошли в систему.'
       unauthenticated: "Вам необходимо войти в систему или зарегистрироваться."

config/routes.rb

@@ -21,11 +21,13 @@ Rails.application.routes.draw do
   end
 
   devise_scope :user do
-    get 'users/sign_up' => 'users/registrations#new',    as: :new_user_registration
-    post 'users'        => 'users/registrations#create', as: :user_registration
+    get '/users/auth/:provider' => 'users/omniauth_callbacks#passthru'
+    get 'users/sign_up'         => 'users/registrations#new',    as: :new_user_registration
+    post 'users'                => 'users/registrations#create', as: :user_registration
   end
 
   devise_for :users, controllers: {
+    omniauth_callbacks: 'users/omniauth_callbacks',
     confirmations:      'users/confirmations'
   }, skip: [:registrations]