#!/bin/bash

set -e

ACMEUSER="$1"
CERTS_DIR="$2"
SUBJ="$3"

if [ -z "$ACMEUSER" ] || [ -z "$CERTS_DIR" ] || [ -z "$SUBJ" ]; then
  echo "Usage: $0 acmeuser /mysite/certs/dir/ /CN=mysite.com/CN=www.mysite.com"
  exit 0
fi

BASE_DIR=$(cd `dirname "$0"`; pwd)
NAME=`date +%Y-%m-%d--%H-%M-%S--%N`
PREFIX="$CERTS_DIR/$NAME"

echo " -------------------------------------------- "
echo " begin $PREFIX "
echo " -------------------------------------------- "

mkdir -p "$CERTS_DIR"
openssl genrsa -out "$PREFIX.key" 4096
openssl req -new -sha512 -key "$PREFIX.key" -out "$PREFIX.csr" -subj "$SUBJ"
sudo -u "$ACMEUSER" "$BASE_DIR/sign-cert.py" "$PREFIX.csr" "$PREFIX.crt"

echo "compare modulus"
$MUDULUS_CRT=`openssl x509 -noout -modulus -in "$PREFIX.csr"`
$MUDULUS_KEY=`openssl rsa -noout -modulus -in "$PREFIX.key"`
if [ "$MODULUS_CRT" != "$MUDULUS_KEY" ]; then
  echo "ERROR: modulus of certificate do not matches modulus of key"
  exit 1
fi
echo "ok"

cd "$CERTS_DIR"
ln -fs "$PREFIX.key" "private.key"
ln -fs "$PREFIX.key" "public.crt"

echo " -------------------------------------------- "
echo " done $PREFIX "
echo " -------------------------------------------- "