#!/bin/bash
set -eu

# ==================================================================================== #
# VARIABLES
# ==================================================================================== #

# Set the timezone for the server. A full list of available timezones can be found by
# running timedatectl list-timezones.
TIMEZONE=Europe/Vienna

# Set the name of the new user to create.
USERNAME=alfheim

# Prompt to enter a password for the PostgreSQL greenlight user (rather than hard-coding
# a password in this script).
read -p "Enter password for alfheim DB user: " DB_PASSWORD

# Force all output to be presented in en_US for the duration of this script. This avoids
# any "setting locale failed" errors while this script is running, before we have
# installed support for all locales. Do not change this setting!
export LC_ALL=en_US.UTF-8

# ==================================================================================== #
# SCRIPT LOGIC
# ==================================================================================== #

# Update all software packages. Using the --force-confnew flag means that configuration
# files will be replaced if newer ones are available.
apt update
apt --yes -o Dpkg::Options::="--force-confnew" upgrade

# Set the system timezone and install all locales.
timedatectl set-timezone ${TIMEZONE}
apt --yes install locales-all

# Add the new user (and give them sudo privileges).
useradd --create-home --shell "/bin/bash" --groups sudo "${USERNAME}"

# Force a password to be set for the new user the first time they log in.
passwd --delete "${USERNAME}"
chage --lastday 0 "${USERNAME}"

# Copy the SSH keys from the root user to the new user.
rsync --archive --chown=${USERNAME}:${USERNAME} /root/.ssh /home/${USERNAME}

# Configure the firewall to allow SSH, HTTP and HTTPS traffic.
ufw allow 22
ufw allow 80/tcp
ufw allow 443/tcp
ufw --force enable

#
# Install fail2ban.
apt --yes install fail2ban
apt --yes install certbot

sudo apt install -y debian-keyring debian-archive-keyring apt-transport-https curl
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' | sudo tee /etc/apt/sources.list.d/caddy-stable.list
sudo apt update
sudo apt install caddy

# Add a DSN for connecting to the greenlight database to the system-wide environment
# variables in the /etc/environment file.
echo "ALFHEIM_DB_DSN='postgres://elves_database:${DB_PASSWORD}@vicenteferrari.com/elves_database'" >> /etc/environment

echo "Script complete! Rebooting..."
reboot