Easily generate wildcard SSQL certificate requests

ssl_certificate_request.rb

#!/usr/bin/env ruby
company_name = "__YOUR_COMPANY_NAME__"
state = "__YOUR_STATE__"

if ARGV.size == 0
  puts "Usage: #{$0} <domain>"
  puts "Generates a new private key and a certificate signing request."
  puts
  puts "NOTE: Always produces a wildcard certificate request."
  puts
  puts "Example:"
  puts "  #{$0} instrumentalapp.com"
  abort
end

domain = ARGV.first
wildcard_domain = "*.#{domain}"
puts "Generating key and request for #{wildcard_domain}"
require "openssl"

our_cert_keypair = OpenSSL::PKey::RSA.new(2048)

private_key_filename = "#{domain}.key"
puts "Writing private key to #{private_key_filename}"
File.open(private_key_filename, "w+") do |f|
  f.write our_cert_keypair.to_pem
end

our_cert_req = OpenSSL::X509::Request.new
our_cert_req.subject = OpenSSL::X509::Name.new([
    ["C", "US"],
    ["ST", state],
    ["O", company_name],
    ["CN", wildcard_domain]
  ])
our_cert_req.public_key = our_cert_keypair.public_key
our_cert_req.sign our_cert_keypair, OpenSSL::Digest::SHA256.new

request_filename = "#{domain}.csr"
puts "Writing certificate signing request to #{request_filename}"
File.open(request_filename, "w+") do |f|
  f.write our_cert_req.to_pem
end

puts
puts our_cert_req.to_pem