You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: file.rb
    path of file: ./repos/grape/lib/grape/validations/types
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Grape
  module Validations
    module Types
      # Implementation for parameters that are multipart file objects.
      # Actual handling of these objects is provided by +Rack::Request+;
      # this class is here only to assert that rack's handling has s
    
          def parse(input)
            return if input.nil?
            return InvalidValue.new unless parsed?(input)

            # Processing of multipart file objects
            # is already taken care of by Rack::Request.
            # Nothing to do here.
            input
          end

          def parsed?(value)
            # Rack::Request creates a Hash with filename,
            # content type and an IO object. Do a bit of basic
            # duck-typing.
            value.is_a?(::Hash) && value.key?(:tempfile) && value[:tempfile].is_a?(Tempfile)
          end
        end