module ActionController::ParamsWrapper

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

def _perform_parameter_wrapping
  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

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)
rescue ActionDispatch::Http::Parameters::ParseError
  false
end

def _wrapper_formats
  _wrapper_options.format
end

def _wrapper_key
  _wrapper_options.name
end

def process_action(*)
  _perform_parameter_wrapping if _wrapper_enabled?
  super
end