Facebook token expiration and renewal, with Koala and omniauth-facebook

Question

I\'m writing a Rails app that uses omniauth-facebook to authenticate the user against FB (and to get a FB OAuth access token for the user). The app then uses Koala to make

Answer 1

You can do something like this where you check if the access_token is expired and generate another one.

 %w[facebook].each do |provider|
   scope provider, -> { where(provider: provider) }
 end

 def client
   send("#{provider}_client")
 end

 def expired?
   expires_at? && expires_at <= Time.zone.now
 end

 def access_token
   send("#{provider}_refresh_token!", super) if expired?
   super
 end

 def facebook_refresh_token!(token)
   new_token_info = 
   Koala::Facebook::OAuth.new.exchange_access_token_info(token)
   update(access_token: new_token_info["access_token"], expires_at: Time.zone.now + new_token_info["expires_in"])
 end

You can check gorails screencast that explains this on depth.