Add Google as an OAuth provider / strategy to the project.

Users can now sign in with Google as well.

Gemfile

@@ -13,6 +13,7 @@ gem 'active_hash'
 gem 'sanitize'
 gem 'gmaps4rails'
 gem 'geocoder'
+gem 'omniauth-google-oauth2'
 gem 'omniauth-meetup'
 gem 'omniauth-facebook'
 gem 'omniauth-twitter'

Gemfile.lock

@@ -195,13 +195,19 @@ GEM
     omniauth-github (1.1.2)
       omniauth (~> 1.0)
       omniauth-oauth2 (~> 1.1)
+    omniauth-google-oauth2 (0.2.10)
+      addressable (~> 2.3)
+      jwt (~> 1.0)
+      multi_json (~> 1.3)
+      omniauth (>= 1.1.1)
+      omniauth-oauth2 (~> 1.3.1)
     omniauth-meetup (0.0.7)
       omniauth (~> 1.0)
       omniauth-oauth2 (~> 1.0)
     omniauth-oauth (1.1.0)
       oauth
       omniauth (~> 1.0)
-    omniauth-oauth2 (1.4.0)
+    omniauth-oauth2 (1.3.1)
       oauth2 (~> 1.0)
       omniauth (~> 1.2)
     omniauth-twitter (1.2.1)
@@ -371,6 +377,7 @@ DEPENDENCIES
   newrelic_rpm
   omniauth-facebook
   omniauth-github
+  omniauth-google-oauth2
   omniauth-meetup
   omniauth-twitter
   pg

app/controllers/devise_overrides/omniauth_callbacks_controller.rb

@@ -24,7 +24,7 @@ def all
       redirect_to new_user_registration_path
     end
   end
-  [:facebook, :twitter, :github, :meetup].each do |provider|
+  [:facebook, :twitter, :github, :meetup, :google_oauth2].each do |provider|
     alias_method provider, :all
   end
-end
+end

app/services/omniauth_providers.rb

@@ -20,7 +20,12 @@ def self.provider_data
         key: :meetup,
         name: 'Meetup',
         icon: 'fa-calendar'
-      }
+      },
+      {
+        key: :google_oauth2,
+        name: 'Google',
+        icon: 'fa-google'
+      },
     ]
   end
 
@@ -48,6 +53,8 @@ def self.user_attributes_from_omniauth(omniauth)
         self.github_omniauth_attributes(omniauth)
       when 'meetup'
         self.meetup_omniauth_attributes(omniauth)
+      when 'google_oauth2'
+        self.google_oauth2_omniauth_attributes(omniauth)
       else
         raise 'Unknown Provider'
     end
@@ -86,4 +93,12 @@ def self.github_omniauth_attributes(omniauth)
   def self.meetup_omniauth_attributes(omniauth)
     self.split_name(omniauth['info']['name'])
   end
+
+  def self.google_oauth2_omniauth_attributes(omniauth)
+    {
+      email: omniauth['info']['email'],
+      first_name: omniauth['info']['first_name'],
+      last_name: omniauth['info']['last_name']
+    }
+  end
 end

config/initializers/devise.rb

@@ -234,6 +234,7 @@
   config.omniauth :twitter, ENV['TWITTER_OAUTH_KEY'], ENV['TWITTER_OAUTH_SECRET']
   config.omniauth :github, ENV['GITHUB_OAUTH_KEY'], ENV['GITHUB_OAUTH_SECRET']
   config.omniauth :meetup, ENV['MEETUP_OAUTH_KEY'], ENV['MEETUP_OAUTH_SECRET']
+  config.omniauth :google_oauth2, ENV['GOOGLE_OAUTH_KEY'], ENV['GOOGLE_OAUTH_SECRET']
 
   # ==> Warden configuration
   # If you want to use other strategies, that are not supported by Devise, or

spec/features/omniauth_request_spec.rb

@@ -43,6 +43,43 @@
     end
   end
 
+  context "with a valid google_oauth2 auth" do
+    let(:google_oauth2_response) { OmniauthResponses.google_oauth2_response }
+
+    before do
+      OmniAuth.config.mock_auth[:google_oauth2] = OmniAuth::AuthHash.new(google_oauth2_response)
+    end
+
+    it 'creates a user and authentication if the user does not exist' do
+      visit user_omniauth_authorize_path(:google_oauth2)
+
+      within '#sign-up' do
+        click_on 'Sign up'
+      end
+
+      user = User.last
+      expect(user).to be_valid
+      expect(user.first_name).to eq(google_oauth2_response[:info][:first_name])
+      expect(user.last_name).to eq(google_oauth2_response[:info][:last_name])
+      expect(user.email).to eq(google_oauth2_response[:info][:email])
+
+      authentication = user.authentications.first
+      expect(authentication.provider).to eq('google_oauth2')
+      expect(authentication.uid).to eq(google_oauth2_response[:uid])
+    end
+
+    it 'creates a new authentication if the user already exists' do
+      user = create(:user)
+      sign_in_as user
+
+      visit user_omniauth_authorize_path(:google_oauth2)
+
+      authentication = user.authentications.first
+      expect(authentication.provider).to eq('google_oauth2')
+      expect(authentication.uid).to eq(google_oauth2_response[:uid])
+    end
+  end
+
   context "with a valid twitter auth" do
     let(:twitter_response) { OmniauthResponses.twitter_response }
 
@@ -193,4 +230,4 @@
 
     expect(page).to have_content('Admin Dashboard')
   end
-end
+end

spec/services/omniauth_responses.rb

@@ -169,4 +169,52 @@ def self.github_response
       }
     }
   end
-end
+
+  def self.google_oauth2_response
+    {
+      :provider => 'google_oauth2',
+      :uid => '123456789101112130122',
+      :info => {
+        email: 'joe@bloggs.com',
+        first_name: 'Joe',
+        image: "https://robohash.org/sitsequiquia.png?size=512x512",
+        last_name: "Bloggs",
+        name: "Joe Bloggs",
+        urls: { Google: "https://plus.google.com/494850544950524948535348525457565050575557" }
+      },
+      :credentials => {
+        expires: true,
+        expires_at: 1450062184,
+        refresh_token: "XYZW...",
+        token: "ABCDEF..."
+      },
+      :extra => {
+        id_info: {
+          at_hash: 'abcdefg',
+          aud: "50906091245.apps.googleusercontent.com",
+          azp: "50906091245.apps.googleusercontent.com",
+          email: "joe@bloggs.com",
+          email_verified: true,
+          exp: 1450062184,
+          iat: 1450058584,
+          iss: "accounts.google.com",
+          sub: "102612410550469822979"
+        },
+        id_token: "abcdefghijklmnopqrstuvwxyz",
+        raw_info: {
+          email: "joe@bloggs.com",
+          email_verified: "true",
+          family_name: "Bloggs",
+          gender: "male",
+          given_name: "Joe",
+          kind: "plus#personOpenIdConnect",
+          locale: "en",
+          name: "Joe Bloggs",
+          picture: "https://robohash.org/sitsequiquia.png?size=512x512",
+          profile: "https://plus.google.com/494850544950524948535348525457565050575557",
+          sub: "494850544950524948535348525457565050575557"
+        },
+      }
+    }
+  end
+end