add oauth with google

.env.example

@@ -0,0 +1,2 @@
+GOOGLE_OAUTH_CLIENT_ID=test
+GOOGLE_OAUTH_CLIENT_SECRET=test

.gitignore

@@ -29,3 +29,5 @@
 
 # Ignore master key for decrypting credentials and more.
 /config/master.key
+
+.env

Gemfile

@@ -27,8 +27,11 @@ gem "bootsnap", require: false
 # gem "image_processing", "~> 1.2"
 
 gem "devise", "~> 4.8"
+gem "omniauth", "~> 1.9.1"
+gem "omniauth-google-oauth2", "~> 0.8.2"
 
 group :development, :test do
+  gem "dotenv-rails", "~> 2.7"
   gem "rspec-rails", "~> 5.1"
   gem "factory_bot_rails", "~> 6.2"
 

Gemfile.lock

@@ -87,14 +87,23 @@ GEM
       warden (~> 1.2.3)
     diff-lcs (1.5.0)
     digest (3.1.0)
+    dotenv (2.7.6)
+    dotenv-rails (2.7.6)
+      dotenv (= 2.7.6)
+      railties (>= 3.2)
     erubi (1.10.0)
     factory_bot (6.2.1)
       activesupport (>= 5.0.0)
     factory_bot_rails (6.2.0)
       factory_bot (~> 6.2.0)
       railties (>= 5.0.0)
+    faraday (2.3.0)
+      faraday-net_http (~> 2.0)
+      ruby2_keywords (>= 0.0.4)
+    faraday-net_http (2.0.3)
     globalid (1.0.0)
       activesupport (>= 5.0)
+    hashie (5.0.0)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     importmap-rails (1.1.5)
@@ -106,6 +115,7 @@ GEM
     jbuilder (2.11.5)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
+    jwt (2.4.1)
     loofah (2.18.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -116,6 +126,8 @@ GEM
     mini_mime (1.1.2)
     minitest (5.16.2)
     msgpack (1.5.3)
+    multi_json (1.15.0)
+    multi_xml (0.6.0)
     net-imap (0.2.3)
       digest
       net-protocol
@@ -133,6 +145,23 @@ GEM
     nio4r (2.5.8)
     nokogiri (1.13.7-x86_64-linux)
       racc (~> 1.4)
+    oauth2 (1.4.10)
+      faraday (>= 0.17.3, < 3.0)
+      jwt (>= 1.0, < 3.0)
+      multi_json (~> 1.3)
+      multi_xml (~> 0.5)
+      rack (>= 1.2, < 3)
+    omniauth (1.9.1)
+      hashie (>= 3.4.6)
+      rack (>= 1.6.2, < 3)
+    omniauth-google-oauth2 (0.8.2)
+      jwt (>= 2.0)
+      oauth2 (~> 1.1)
+      omniauth (~> 1.1)
+      omniauth-oauth2 (>= 1.6)
+    omniauth-oauth2 (1.7.3)
+      oauth2 (>= 1.4, < 3)
+      omniauth (>= 1.9, < 3)
     orm_adapter (0.5.0)
     pg (1.4.1)
     puma (5.6.4)
@@ -191,6 +220,7 @@ GEM
       rspec-mocks (~> 3.10)
       rspec-support (~> 3.10)
     rspec-support (3.11.0)
+    ruby2_keywords (0.0.5)
     sprockets (4.1.1)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -229,9 +259,12 @@ DEPENDENCIES
   bootsnap
   debug
   devise (~> 4.8)
+  dotenv-rails (~> 2.7)
   factory_bot_rails (~> 6.2)
   importmap-rails
   jbuilder
+  omniauth (~> 1.9.1)
+  omniauth-google-oauth2 (~> 0.8.2)
   pg (~> 1.1)
   puma (~> 5.0)
   rails (~> 7.0.3, >= 7.0.3.1)

app/controllers/users/omniauth_callbacks_controller.rb

@@ -0,0 +1,16 @@
+module Users
+  class OmniauthCallbacksController < Devise::OmniauthCallbacksController
+    def google_oauth2
+      # You need to implement the method below in your model (e.g. app/models/user.rb)
+      @user = User.find_by!(email: request.env['omniauth.auth'].info['email'])
+
+      flash[:notice] = I18n.t 'devise.omniauth_callbacks.success', kind: 'Google'
+      sign_in_and_redirect @user, event: :authentication
+    rescue ActiveRecord::RecordNotFound => e
+      # Removing extra as it can overflow some session stores
+      session['devise.google_data'] = request.env['omniauth.auth'].except('extra')
+
+      redirect_to new_user_registration_url, alert: e.message
+    end
+  end
+end

app/models/user.rb

@@ -18,10 +18,13 @@
 #  index_users_on_reset_password_token  (reset_password_token) UNIQUE
 #
 class User < ApplicationRecord
-  # Include default devise modules. Others available are:
-  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
-  devise :database_authenticatable, :registerable,
-         :recoverable, :rememberable, :validatable
+  devise :database_authenticatable,
+         :registerable,
+         :recoverable,
+         :rememberable,
+         :validatable,
+         :omniauthable,
+         omniauth_providers: [:google_oauth2]
 
   validates :name, presence: true
 end

config/application.rb

@@ -18,6 +18,10 @@ require "action_cable/engine"
 # you've limited to :test, :development, or :production.
 Bundler.require(*Rails.groups)
 
+if ['development', 'test'].include? ENV['RAILS_ENV']
+  Dotenv::Railtie.load
+end
+
 module ProgressTest
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.

config/initializers/devise.rb

@@ -271,7 +271,12 @@ Devise.setup do |config|
   # ==> OmniAuth
   # 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(
+    :google_oauth2,
+    ENV['GOOGLE_OAUTH_CLIENT_ID'],
+    ENV['GOOGLE_OAUTH_CLIENT_SECRET'],
+    {}
+  )
 
   # ==> Warden configuration
   # If you want to use other strategies, that are not supported by Devise, or

config/routes.rb

@@ -1,5 +1,5 @@
 Rails.application.routes.draw do
-  devise_for :users
+  devise_for :users, controllers: { omniauth_callbacks: 'users/omniauth_callbacks' }
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   # Defines the root path route ("/")