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: sftp.rb
    path of file: ./repos/chef/lib/chef/provider/remote_file
    
    the code of the file until where you have to start completion: #
# Author:: John Kerry (<john@kerryhouse.net>)
# Copyright:: Copyright 2013-2016, John Kerry
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.
    
        def validate_path!
          path = uri.path.sub(%r{\A/}, "%2F") # re-encode the beginning slash because uri library decodes it.
          directories = path.split(%r{/}, -1)
          directories.each do |d|
            d.gsub!(/%([0-9A-Fa-f][0-9A-Fa-f])/) { [$1].pack("H2") }
          end
          unless filename = directories.pop
            raise ArgumentError, "no filename: #{path.inspect}"
          end