Config Facebook Login App for oAuth

[byhbt]

Problem:

As an user i want to login via my Facebook account.
And the website app can retrieve my Facebook info (email, public info) to create new account in system.

Solution:

Lesson:

1. Use Ngrok to enable public access to local development webserver.
2. Provide the term and privacy page to Facebook App configuration to make it live.
3. Check correct callback URL, it often includes the https
4. Allow Rails app access from Ngrok, by adding the below code to file:

config/environments/development.rb

config.hosts << "a2395ad5fbe8.ngrok.io"

5. Config Devise

config/initializers/devise.rb

config.omniauth :facebook, APP_CONFIG.facebook.app_id, APP_CONFIG.facebook.secret, scope: APP_CONFIG.facebook.scope

File: config/settings/application.rb

  group :facebook do
    set :namespace, 'FACEBOOK_NAMESPACE'
    set :app_id, 'FACEBOOK_APP_ID'
    set :secret, 'FACEBOOK_SECRET'
    set :scope, 'email, public_profile, user_birthday, user_likes'
    set :cache_expiry_time, 7.days
  end