adding error logging to the devise_oauth2_providable gem

devise_oauth.rb

require 'devise/strategies/base'

# in order to diagnose issues with the iphone app, we needed
# to monkeypatch the error code to put the error explanation in the logs

module Devise
  module Strategies
    class Oauth2GrantTypeStrategy < Authenticatable
      # return custom error response in accordance with the oauth spec
      # see http://tools.ietf.org/html/draft-ietf-oauth-v2-16#section-4.3
      def oauth_error!(error_code = :invalid_request, description = nil)
        body = {:error => error_code}
        body[:error_description] = description if description
        push_error_to_console(body)
        custom! [400, {'Content-Type' => 'application/json'}, [body.to_json]]
        throw :warden
      end

      def push_error_to_console(body)
        p "*** devise oauth error 400 with body: #{body}"
      end
    end
  end
end