SES Write password to sasl_passwd

require 'openssl'
require 'base64'

sha256 = OpenSSL::Digest::Digest.new('sha256')
secret_key = "<SECRET>"
message = "SendRawEmail"
version = "\x02"

signature = OpenSSL::HMAC.digest(sha256, secret_key, message)
verSignature = version + signature

password = Base64.encode64(verSignature)
sasl_file = File.open "/etc/postfix/sasl_passwd", "w"

sasl_file.write "[email-smtp.us-east-1.amazonaws.com]:587 <API_KEY>:#{password}\n"
sasl_file.close

exit 0