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#!/bin/sh

set -e
set -u

cd ~/certs

if [ "$#" != 1 ]; then
  echo >&2 "Usage: $0 <fqdn>"
  exit 1
fi

cn="$1"
shift

if ! [ -e "$cn.key" ] ; then
  echo >&2 "$cn.key does not exist."
  exit 1
fi

if [ -e "$cn-letsencrypt.pem" ] ; then
  pem="$cn-letsencrypt.pem"
  chain="extra/letsencryptauthorityx1.pem"
elif [ -e "$cn.pem" ] ; then
  pem="$cn.pem"
  if [ -e "$cn-chain.pem" ]; then
    chain="$cn-chain.pem"
  else
    chain=""
  fi
elif [ -e "$cn-selfsigned.pem" ] ; then
  pem="$cn-selfsigned.pem"
  chain=""
  echo >&2 "Warning: only selfsigned cert available for $cn."
else
  echo >&2 "Error: no cert available for $cn."
  exit 1
fi

(
cat "$pem"
if [ -n "$chain" ]; then
cat "$chain"
fi

size=$(openssl rsa  < "$cn".key -text -noout | awk -F: '$1 == "Private-Key" {print $2}' | sed -e 's/[^0-9]//g')
if [ -e extra/dh-"$size".pem ]; then
  cat extra/dh-"$size".pem;
else
  echo >&2 "Warning: No extra/dh-$size.pem file found."
fi

) > $cn-combined.crt