module ActionController::ParamsWrapper

def _extract_parameters(parameters)
  if include_only = _wrapper_options.include
    parameters.slice(*include_only)
  else
    exclude = _wrapper_options.exclude || []
    parameters.except(*(exclude + EXCLUDE_PARAMETERS))
  end
end

def _wrap_parameters(parameters)
  { _wrapper_key => _extract_parameters(parameters) }
end

def _wrapper_enabled?
  return false unless request.has_content_type?
  ref = request.content_mime_type.ref
  _wrapper_formats.include?(ref) && _wrapper_key && !request.parameters.key?(_wrapper_key)
end

def _wrapper_formats
  _wrapper_options.format
end

def _wrapper_key
  _wrapper_options.name
end

def process_action(*args)
  if _wrapper_enabled?
    wrapped_hash = _wrap_parameters request.request_parameters
    wrapped_keys = request.request_parameters.keys
    wrapped_filtered_hash = _wrap_parameters request.filtered_parameters.slice(*wrapped_keys)
    # This will make the wrapped hash accessible from controller and view.
    request.parameters.merge! wrapped_hash
    request.request_parameters.merge! wrapped_hash
    # This will display the wrapped hash in the log file.
    request.filtered_parameters.merge! wrapped_filtered_hash
  end
  super
end