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

What I have is a before_filter that is triggered on every page that requires an active Facebook session. Something like this should work:

  before_filter :reconnect_with_facebook
  def reconnect_with_facebook
    if current_account && current_account.token_expired?(session[:fb]["expires"])

    # re-request a token from facebook. Assume that we got a new token so
    # update it anyhow...
    session[:return_to] = request.env["REQUEST_URI"] unless request.env["REQUEST_URI"] == facebook_request_path
    redirect_to(with_canvas(facebook_request_path)) and return false
  end
end

The token_expired? method looks like this:

def token_expired?(new_time = nil)
  expiry = (new_time.nil? ? token_expires_at : Time.at(new_time))
  return true if expiry < Time.now ## expired token, so we should quickly return
  token_expires_at = expiry
  save if changed?
  false # token not expired. :D
end