timber_log_subscriber.rb

module Timber
  module Integrations
    module ActionController
      class LogSubscriber < Integrator
        # The log subscriber that replaces the default `ActionController::LogSubscriber`.
        # The intent of this subscriber is to, as transparently as possible, properly
        # track events that are being logged here. This LogSubscriber will never change
        # default behavior / log messages.
        #
        # @private
        class TimberLogSubscriber < ::ActionController::LogSubscriber
          def start_processing(event)
            return true if silence?

            info do
              payload = event.payload
              params  = payload[:params].except(*INTERNAL_PARAMS)
              format  = extract_format(payload)
              format  = format.to_s.upcase if format.is_a?(Symbol)

              Events::ControllerCall.new(
                controller: payload[:controller],
                action: payload[:action],
                format: format,
                params: params
              )
            end
          end

          def unpermitted_parameters(event)
            info do
                unpermitted_keys = event.payload[:keys]
                "Unpermitted parameter#{'s' if unpermitted_keys.size > 1}: #{unpermitted_keys.map { |e| ":#{e}" }.join(", ")}"
            end
          end

          private
            def extract_format(payload)
              if payload.key?(:format)
                payload[:format] # rails > 4.X
              elsif payload.key?(:formats)
                payload[:formats].first # rails 3.X
              end
            end

            def silence?
              ActionController.silence?
            end
        end
      end
    end
  end
end