Facebook authenticate

app/controllers/users/omniauth_callbacks_controller.rb

@@ -27,4 +27,19 @@ class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
   # def after_omniauth_failure_path_for(scope)
   #   super(scope)
   # end
+  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
+  end
+
+  def failure
+    redirect_to root_path
+  end
 end

app/models/user.rb

@@ -2,7 +2,7 @@ class User < ApplicationRecord
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
   devise :database_authenticatable, :registerable,
-         :recoverable, :rememberable, :validatable, :confirmable
+         :recoverable, :rememberable, :validatable, :confirmable, :omniauthable, omniauth_providers: %i[facebook]
 
   has_many :applies
   has_many :jobs, through: :applies
@@ -10,4 +10,24 @@ class User < ApplicationRecord
   has_many :jobs, through: :favorites
 
   mount_uploader :cv, CvUploader
+
+  def self.from_omniauth(auth)
+    where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
+      user.email = auth.info.email
+      user.password = Devise.friendly_token[0, 20]
+      user.full_name = auth.info.name   # assuming the user model has a name
+      user.image = auth.info.image # assuming the user model has an image
+      # If you are using confirmable and the provider(s) you use validate emails, 
+      # uncomment the line below to skip the confirmation emails.
+      # user.skip_confirmation!
+    end
+  end
+
+  def self.new_with_session(params, session)
+    super.tap do |user|
+      if data = session["devise.facebook_data"] && session["devise.facebook_data"]["extra"]["raw_info"]
+        user.email = data["email"] if user.email.blank?
+      end
+    end
+  end
 end

app/views/layouts/application.html.erb

@@ -35,7 +35,7 @@
                 <button type="submit" id="searchsubmit" class="searchform__submit searchform--header__submit"><span class="screen-reader-text">Search</button>
               </form>
               <div class="nav-menu nav-menu--primary">
-                <ul id="menu-main-menu" class="nav-menu nav-menu--primary">
+                <ul id="menu-main-menu" class="nav-menu nav-menu--primary">%>
                   <% if !current_admin %>
                     <li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-99991208">
                       <a href="/jobs">Find A Job</a>
@@ -77,6 +77,7 @@
                       </li>
                     <% end %>
                   <% end %>
+                  <%= link_to "Sign in with Facebook", user_facebook_omniauth_authorize_path %>
                 </ul>
               </div>
             </nav>

config/initializers/devise.rb

@@ -260,7 +260,7 @@ 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 :facebook, "586868888590440", "6cd80c6f7926e1eb729db4a3bf2f9413", token_params: { parse: :json }
+  config.omniauth :facebook, "174972447159044", "24253120f824a205681970a5ebb707ab", token_params: { parse: :json }
   # ==> Warden configuration
   # If you want to use other strategies, that are not supported by Devise, or
   # change the failure app, you can configure them inside the config.warden block.

config/routes.rb

@@ -4,7 +4,8 @@ Rails.application.routes.draw do
   }
   devise_for :users, controllers: {
     sessions: 'users/sessions',
-    confirmations: 'users/confirmations'
+    confirmations: 'users/confirmations',
+    omniauth_callbacks: 'users/omniauth_callbacks'
   }
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
   root to: 'home#index'

db/migrate/20200410070154_add_columns_to_users.rb

 class AddColumnsToUsers < ActiveRecord::Migration[6.0]
   def change
     add_column :users, :full_name, :string
+    add_column :users, :image, :string
     add_column :users, :cv, :string
+    add_column :users, :provider, :string
+    add_column :users, :uid, :string
   end
 end

db/schema.rb

@@ -105,7 +105,10 @@ ActiveRecord::Schema.define(version: 2020_04_23_044651) do
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
     t.string "full_name"
+    t.string "image"
     t.string "cv"
+    t.string "provider"
+    t.string "uid"
     t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true