#!/bin/bash

# Props to https://github.com/coolaj86/nodejs-self-signed-certificate-example for this handy script.
if [ ! -d "certs" ] ; then
  FQDN="FullyQualifiedDomainName" #since this is just for development this can be random

  # make directories to work from
  mkdir -p certs/{server,client,ca,tmp}

  # Create your very own Root Certificate Authority
  openssl genrsa \
    -out certs/ca/my-root-ca.key.pem \
    2048

  # Self-sign your Root Certificate Authority
  # Since this is private, the details can be as bogus as you like
  # Country param needs to be 2 characters max
  openssl req \
    -x509 \
    -new \
    -nodes \
    -key certs/ca/my-root-ca.key.pem \
    -days 1024 \
    -out certs/ca/my-root-ca.crt.pem \
    -subj "/C=AU/ST=Vic/L=Mel/O=Joan/CN=${FQDN}"

  # Create a Device Certificate for each domain,
  # such as example.com, *.example.com, awesome.example.com
  # NOTE: You MUST match CN to the domain name or ip address you want to use
  openssl genrsa \
    -out certs/server/my-server.key.pem \
    2048

  # Create a request from your Device, which your Root CA will sign
  # Country param needs to be 2 characters max
  openssl req -new \
    -key certs/server/my-server.key.pem \
    -out certs/tmp/my-server.csr.pem \
    -subj "/C=AU/ST=VIC/L=Mel/O=Joan/CN=${FQDN}"

  # Sign the request from Device with your Root CA
  # -CAserial certs/ca/my-root-ca.srl
  openssl x509 \
    -req -in certs/tmp/my-server.csr.pem \
    -CA certs/ca/my-root-ca.crt.pem \
    -CAkey certs/ca/my-root-ca.key.pem \
    -CAcreateserial \
    -out certs/server/my-server.crt.pem \
    -days 500

  # Create a public key, for funzies
  # see https://gist.github.com/coolaj86/f6f36efce2821dfb046d
  openssl rsa \
    -in certs/server/my-server.key.pem \
    -pubout -out certs/client/my-server.pub

  # Put things in their proper place
  rsync -a certs/ca/my-root-ca.crt.pem certs/server/
  rsync -a certs/ca/my-root-ca.crt.pem certs/client/
else
  echo "self-signed certs already exist"
fi
