gensig

#!/usr/bin/env ruby

# Example: ./gensig 0 0123456789ABCDEF0123456789ABCDEF "[0,transactioncreate,[account_code:testac,amount_in_cents:5000,currency:USD]]"

require 'openssl'

@timestamp = ARGV[0]
@private_key = ARGV[1]


def generate_signature(input_string, timestamp=nil)
  timestamp ||= Time.now.to_i
  timestamp = timestamp.to_s

  digest_key = ::Digest::SHA1.digest(@private_key)
  sha1_hash = ::OpenSSL::Digest::Digest.new("sha1")
  signature = ::OpenSSL::HMAC.hexdigest(sha1_hash, digest_key, input_string.to_s)
  signature + '-' + timestamp
end

puts 'signature: %s' % generate_signature(ARGV[2], @timestamp)