TOTP tester using rotp gem

totp.rb

require 'rotp'
require 'qrencoder'

random = "m5qckrq57y2s6232"
totp   = ROTP::TOTP.new(random)

qr_string = totp.provisioning_uri("[email protected]")
qr_code   = QREncoder.encode(qr_string)
qr_code.png(pixels_per_module: 4, margin: 1).save("qr_code.png")

puts "OK. Now open qr_code.png and scan it into Google Authenticator."
puts ""

loop do
  printf("What is your most excelent OTP? ")

  otp = gets.chop
  puts totp.verify_with_drift(otp, 120)
end