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Contents
# Copyright (c) 2020 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true
cs__scoped_require 'contrast/components/interface'
module Contrast
module Utils
# Util for information about an IO
class IOUtil
include Contrast::Components::Interface
access_component :logging
# We're only going to call rewind on things that we believe are safe to
# call it on. This method white lists those cases and returns false in
# all others.
def self.should_rewind? potential_io
return true if potential_io.is_a?(StringIO)
return false unless io?(potential_io)
should_rewind_io?(potential_io)
rescue StandardError => e
logger.debug('Encountered an issue determining if rewindable', e, module: potential_io.cs__class.name)
false
end
# IO cannot be used with streams such as pipes, ttys, and sockets.
def self.should_rewind_io? io
return false if io.tty?
status = io.stat
return false unless status
return false if status.pipe?
return false if status.socket?
true
end
# A class is IO if it is a decedent or delegate of IO
def self.io? object
return true if object.is_a?(IO)
# DelegateClass, which is a Delegator, defines __getobj__ as a way to
# get the object that the class wraps around (delegates to)
return false unless object.is_a?(Delegator)
object.__getobj__.is_a?(IO)
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems