Social login facebook,twitter ..

Gemfile:

gem "oauth"
gem "oauth2"
gem 'omniauth-oauth2'
gem 'omniauth-facebook'
gem 'omniauth-twitter'
gem 'omniauth-google-oauth2'
gem 'omniauth-linkedin'
gem 'omniauth-github'
gem 'omniauth-pinterest'

--------------------------------------------------

Model generate:

 rails g model authentication provider:string uid:string user_id:integer token:text token_expired_at:datetime

--------------------------------------------------

app/model/authentication.rb:

class Authentication < ApplicationRecord
belongs_to :user
def self.from_omniauth(auth)
    authenticate = where(provider: auth['provider'], :uid=>auth['uid']).first_or_initialize
    register_user = User.find_by(email: auth.info.email)
    if authenticate.user
      return authenticate.user
    elsif register_user
      register_user.authentications.create(provider: auth['provider'], :uid=>auth['uid'])
      return register_user
    else
      user = User.new(
        email: auth.info.try(:email),                      
        password: Devise.friendly_token.first(8)
      )
      if user.email.blank?
        user.email=auth.extra.raw_info.id.to_s+"@gmail.com"
      end
      user.save!(:validate => false)
      user.authentications.create(provider: auth['provider'], :uid=>auth['uid'],token: auth["credentials"]["token"])
      return user
   end
  end
end

-------------------------------------------

User.rb

before_create :confirmation_token
has_many :authentications, dependent: :destroy
validates :email, :uniqueness => {:allow_blank => true}

-------------------------------------------

config/intializers/omniauth.rb:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :facebook, "#{ENV['FACEBOOK_APP_ID']}", "#{ENV['FACEBOOK_APP_SERCRET']}", :scope => 'email, user_friends, manage_pages, pages_show_list'
  provider :google_oauth2, "#{ENV['GOOGLE_APP_ID']}", "#{ENV['GOOGLE_APP_SERCRET']}", scope: 'userinfo.profile,youtube,email', provider_ignores_state: true, prompt: :consent
  provider :twitter, "#{ENV['Twitter_APP_ID']}", "#{ENV['Twitter_APP_SERCRET']}"
  provider :linkedin, "#{ENV['Linkedin_APP_ID']}", "#{ENV['Linkedin_APP_SERCRET']}"
  provider :github, "#{ENV['Github_APP_ID']}", "#{ENV['Github_APP_SERCRET']}", :scope => 'email'
  provider :pinterest, "#{ENV['Pinterest_APP_ID']}", "#{ENV['Pinterest_APP_SERCRET']}", :scope => 'read_public,write_public'
end

--------------------------------------------
application.yml:

default:
  DATABASE_ADAPTER: postgresql
  DATABASE_USER: root
  DATABASE_PASSWORD: root
  DATABASE_NAME: go_foot_ball
  DATABASE_HOST: localhost
  DOMAIN: localhost
  FACEBOOK_APP_ID: xxxxxxxxxx
  FACEBOOK_APP_SERCRET: xxxxxxxxxxxxxxxxxxx
  TWITTER_CONSUMER_KEY: xxxxxxxxxxxxxxxxx
  TWITTER_CONSUMER_SECRET: xxxxxxxxxxxxxxxxx
  INSTAGRAM_APP_ID: xxxxxxxxxxxxxxxxxxxxxxxxx
  INSTAGRAM_APP_SERCRET: xxxxxxxxxxxx
  # AWS_ACCESS_KEY_ID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  # AWS_SECRET_ACCESS_KEY:xxxxxxxxxxxxxxxxxxxxxxxxxx
  # REGION: 'us-west-2'
  # AWS_BUCKET_NAME: xxxxxxxxxxxx
  # FACEBOOK_APP_VERSION: 'v2.8'

development:
  DATABASE_ADAPTER: postgresql
  DATABASE_USER: root
  DATABASE_PASSWORD: root
  DATABASE_NAME: go_foot_ball
  DATABASE_HOST: localhost
  DOMAIN: localhost
  FACEBOOK_APP_ID: xxxxxxxxxxxx
  FACEBOOK_APP_SERCRET: xxxxxxxxxxxxxxxxx
  TWITTER_CONSUMER_KEY: xxxxxxxxxxxxxxxxxx
  TWITTER_CONSUMER_SECRET: xxxxxxxxxxxxxxxxxx
  INSTAGRAM_APP_ID: xxxxxxxxxxxxxxxxxxxxxxxx
  INSTAGRAM_APP_SERCRET: xxxxxxxxxxxxxxxxxxxxxx

testing:
  DATABASE_ADAPTER: postgresql
  DATABASE_USER: root
  DATABASE_PASSWORD: root
  DATABASE_NAME: go_foot_ball
  DATABASE_HOST: localhost
  DOMAIN: localhost

production:
  DATABASE_ADAPTER: postgresql
  DATABASE_USER: root
  DATABASE_PASSWORD: root
  DATABASE_NAME: go_foot_ball
  DATABASE_HOST: localhost
  DOMAIN: localhost

----------------------------------------------

routes:

  match '/auth/:provider/callback', :to => 'pages#create', via: [:get, :post]
  match '/auth/failure', :to => 'pages#failure', via: [:get, :post]

---------------------------------------------

app/controller/pages_controller.rb:

def create
    user = Authentication.from_omniauth(request.env["omniauth.auth"])
    if user
      flash[:notice] = "Authentication successful."
     sign_in :user, user
     redirect_to root_path
    else
        flash[:notice] = "Authentication Failed."
        redirect_to "/users/sign_up"
    end
  end
  def failure
  end
  

How To: Add :confirmable to Users

Modifying the User Model

First, add devise :confirmable to your models/user.rb file

devise :registerable, :confirmable

Create a New Migration

Then, do the migration as:

rails g migration add_confirmable_to_devise

Will generate db/migrate/YYYYMMDDxxx_add_confirmable_to_devise.rb. Add the following to it in order to do the migration.

class AddConfirmableToDevise < ActiveRecord::Migration
  # Note: You can't use change, as User.update_all will fail in the down migration
  def up
    add_column :users, :confirmation_token, :string
    add_column :users, :confirmed_at, :datetime
    add_column :users, :confirmation_sent_at, :datetime
    # add_column :users, :unconfirmed_email, :string # Only if using reconfirmable
    add_index :users, :confirmation_token, unique: true
    User.all.update_all confirmed_at: DateTime.now
  end

  def down
    remove_columns :users, :confirmation_token, :confirmed_at, :confirmation_sent_at
  end
end
You can also generate the corresponding Devise views if they have not yet been created:

rails generate devise:views users
Do the migration rake db:migrate

Restart the server.

If you are not using :reconfirmable (i.e leave the commented out lines as they are in the change method described above), update the configuration in config/initializers/devise.rb

config.reconfirmable = false

SMTP Setting:

config.action_mailer.raise_delivery_errors = true
  config.action_mailer.perform_deliveries = true
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
    :address => "smtp.gmail.com",
    :port => "587",
    :domain => "localhost",
    :user_name => "zz.zz@gmail.com",
    :password => "zzzzzzzzzz",
    :authentication => "plain",
    :enable_starttls_auto => true
  }