#!/usr/bin/ruby

require "cgi"
require "rotp"

totp = ROTP::TOTP.new("<%= @totp_key %>", :interval => 3600)

STDIN.each_line do |header|
  cookies = CGI::Cookie.parse(header.chomp)

  if cookie = cookies.fetch("_osm_totp_token", nil)
    if totp.verify(cookie.value.first, :drift_behind => 3600, :drift_ahead => 3600)
      STDOUT.syswrite("1\n")
    else
      STDOUT.syswrite("0\n")
    end
  else
    STDOUT.syswrite("0\n")
  end
end

exit 0