finish registration via linkedin

Gemfile

@@ -18,6 +18,7 @@ gem 'devise'
 gem 'omniauth'
 gem 'omniauth-facebook'
 gem 'omniauth-google-oauth2'
+gem 'omniauth-linkedin-oauth2'
 
 group :development, :test do
   gem 'byebug', platform: :mri

Gemfile.lock

@@ -109,6 +109,8 @@ GEM
       jwt (>= 2.0)
       omniauth (>= 1.1.1)
       omniauth-oauth2 (>= 1.6)
+    omniauth-linkedin-oauth2 (1.0.0)
+      omniauth-oauth2
     omniauth-oauth2 (1.6.0)
       oauth2 (~> 1.1)
       omniauth (~> 1.9)
@@ -205,6 +207,7 @@ DEPENDENCIES
   omniauth
   omniauth-facebook
   omniauth-google-oauth2
+  omniauth-linkedin-oauth2
   puma (~> 3.0)
   rails (~> 5.0.7, >= 5.0.7.2)
   sass-rails (~> 5.0)

app/controllers/users/omniauth_callbacks_controller.rb

 class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
+  skip_before_action :verify_authenticity_token
 
   def facebook
-    # You need to implement the method below in your model (e.g. app/models/user.rb)
-    @user = User.from_omniauth(request.env["omniauth.auth"])
-
-    if @user.persisted?
-      sign_in_and_redirect @user, event: :authentication #this will throw if @user is not activated
-      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
+    sign_in_with "Facebook"
   end
 
   def failure
     redirect_to root_path
   end
 
-  def google_oauth2
-    @user = User.from_omniauth(request.env['omniauth.auth'])
+  def linkedin
+    sign_in_with "LinkedIn"
+  end
 
-    if @user.persisted?
-      flash[:notice] = I18n.t 'devise.omniauth_callbacks.success', kind: 'Google'
-      sign_in_and_redirect @user, event: :authentication
-    else
-      session['devise.google_data'] = request.env['omniauth.auth'].except(:extra)
-      redirect_to new_user_registration_url, alert: @user.errors.full_messages.join("\n")
+  def google_oauth2
+    sign_in_with "Google"
   end
+  
+  def sign_in_with(provider_name)
+    @user = User.from_omniauth(request.env["omniauth.auth"])
+    sign_in_and_redirect @user, :event => :authentication
+    set_flash_message(:notice, :success, :kind => provider_name) if is_navigational_format?
   end
 
 end
\ No newline at end of file

app/models/user.rb

@@ -2,7 +2,7 @@ class User < ApplicationRecord
   
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :omniauthable, 
-         omniauth_providers: [:facebook, :google_oauth2]
+         omniauth_providers: [:facebook, :google_oauth2, :linkedin]
 
   before_create do
     self.email = 'example123@gmail.com' if email.nil?

app/views/application/index.html.erb

 <% unless current_user %>   
   <%= link_to "Sign in with Facebook", user_facebook_omniauth_authorize_path %>
   <%= link_to "Sign in with Google", user_google_oauth2_omniauth_authorize_path %>
+  <%= link_to "Sign in with LinkedIn", user_linkedin_omniauth_authorize_path %>
 <% else %>  <%= current_user[:name] %>  
   <%= link_to "Logout", destroy_user_session_path, method: :delete %>
 <% end %>

config/initializers/devise.rb

@@ -30,4 +30,6 @@ Devise.setup do |config|
 
   config.omniauth :google_oauth2, "444952886435-8s76oeuc53otc8q84jork9mq4php7e7t.apps.googleusercontent.com",
                   "vfJkP71fOkfDKVYa3RgXR3lW", {}
+
+  config.omniauth :linkedin, "860rz2x1z3udrb", "peK2u8waxWK5h3Bq",{}          
 end

config/secrets.yml

@@ -2,6 +2,8 @@ development:
   secret_key_base: b1b8b2c8f26c31fb891d8f8eaf37f5bc26ea31ac8913a4acfe7e9013853eeb3df5e681187e8ed35df9e6526d9528973791f904727fe56d250d903ff21083ece6
   GOOGLE_CLIENT_ID: 444952886435-8s76oeuc53otc8q84jork9mq4php7e7t.apps.googleusercontent.com
   GOOGLE_SECRET_KEY: vfJkP71fOkfDKVYa3RgXR3lW
+  LINKEDIN_CLIENT_ID: 860rz2x1z3udrb
+  LINKEDIN_SECRET_KEY: peK2u8waxWK5h3Bq
 test:
   secret_key_base: dd24cc39a6555956e85cb7d60612c685b91249ed8760a957b155ced0177eb172674137f73ba33d8b886f14089469703830d76ddbd42a996897d8b77aac43b33a
 

db/schema.rb

+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
 ActiveRecord::Schema.define(version: 20190829110429) do
 
   create_table "users", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|