#!/bin/bash
#
# letsencrypt-tools
# https://git.stack-source.com/msb/letsencrypt-tools
# Copyright (c) 2022 Matthew Saunders Brown <matthewsaundersbrown@gmail.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
#
# must be root
if [ "${EUID}" -ne 0 ]; then
  echo "You must be root to run this installer."
  exit
fi

# check for Ubuntu 22.04 (jammy) or Debian 12 (bookworm)
os_codename=`lsb_release -cs`
if [ $os_codename != jammy ] && [ $os_codename != bookworm ]; then
  echo "This installer only runs on Ubuntu 22.04 (jammy) or Debian 12 (Bookworm), bailing out."
  exit 1
fi

# check for existing web server software installs
if [ -d "/etc/letsencrypt/" ] || [ -d "/opt/certbot/" ] || [ -f "/usr/bin/certbot" ]; then
  echo "NOTICE: Let's Encrypt is already installed."
  echo "You must purge any existing certbot installs before running this."
  exit 1
fi

if [ ! -f "/usr/local/bin/vhost.sh" ]; then
  echo "NOTICE: This package requires that Vhost Stack is installed first."
  echo "https://git.stack-source.com/msb/vhost-stack"
  exit 1
fi

# Old apt installation instructions
#apt-get update
#DEBIAN_FRONTEND=noninteractive apt-get -y install certbot python3-certbot python3-certbot-apache

# New pip method - gets latest version, and is needed for certbot-dns-powerdns on Debian 12 Bookworm & Ubuntu 24.04 Noble
DEBIAN_FRONTEND=noninteractive apt-get -y install python3-pip python3-wheel python3-venv libaugeas0
python3 -m venv /opt/certbot
/opt/certbot/bin/pip install --upgrade pip
# pyyaml==5.3.1 currently needed by certbot-dns-powerdns
/opt/certbot/bin/pip install certbot certbot-apache certbot-dns-powerdns pyyaml==5.3.1
ln -s /opt/certbot/bin/certbot /usr/bin/certbot
cp etc/cron.d/cerbot /etc/cron.d/cerbot
chmod 644 /etc/cron.d/cerbot

mkdir /etc/ssl/letsencrypt
chmod 750 /etc/ssl/letsencrypt
chgrp ssl-cert /etc/ssl/letsencrypt

# Let's Encrypt configurations
chown -R root:root etc/
cp -a etc/* /etc/
chmod 644 /etc/letsencrypt/cli.ini
chmod 750 /etc/letsencrypt/renewal-hooks/*/*.sh
chmod 644 /etc/cron.d/certbot
a2enmod --quiet proxy proxy_http
a2enconf --quiet certbot
systemctl restart apache2

# install Let's Encrypt user scripts
cp bin/letsencrypt-* /usr/local/bin
chmod 755 /usr/local/bin/letsencrypt-*

# install Deploy tools used by vpanel-stack
cp sbin/letsencrypt-deploy.sh /usr/local/sbin/
chmod 750 /usr/local/sbin/letsencrypt-deploy.sh
cp systemd/letsencrypt-* /usr/local/lib/systemd/system/
chmod 644 /usr/local/lib/systemd/system/letsencrypt-*
systemctl daemon-reload
systemctl enable --now letsencrypt-deploy.path

echo
fqdn=`hostname -f`
if [ -n "$fqdn" ]; then
  echo "email = webmaster@$fqdn" >> /etc/letsencrypt/cli.ini
  echo "Let's Encrypt email set to webmaster@$fqdn"
  echo "This can be changed by editing /etc/letsencrypt/cli.ini."
else
  echo "Server DNS domain name not set, Let's Encrypt email setting left unconfigured."
fi