# offer to fetch and store github public keys in authorized_keys file
fetch_github_key()
{
  mkdir -p ~/.ssh
  if ! [[ -f ~/.ssh/authorized_keys ]]; then
    touch ~/.ssh/authorized_keys
  fi
  chmod 700 ~/.ssh
  chmod 600 ~/.ssh/*

  read -p "Enter Github Username: " github_username
  curl -s https://github.com/${github_username}.keys >> ~/.ssh/authorized_keys
}

read -t 10 -p "Download github public key for ssh? (Y/n): " REPLY
if [ $? -gt 128 ]; then
  echo "Timed out waiting for input. Defaulting to N!"
  break
fi

case $REPLY in
[yY]*)
  fetch_github_key
  ;;
*)
  ;;
esac

# offer to setup gmail for outgoing smtp messages
# https://geekistheway.com/2021/03/07/configuring-e-mail-alerts-on-your-proxmox/
setup_smtp_to_gmail() 
{
  apt update
  apt install -y libsasl2-modules

  echo "You will need to go to https://security.google.com/settings/security/apppasswords to generate an app password!"
  echo ""
  read -p  'Gmail username (without @gmail.com): ' YOUR_GMAIL_USERNAME
  read -sp 'Gmail App Password: ' YOUR_GMAIL_APP_PASSWORD

  echo "smtp.gmail.com $YOUR_GMAIL_USERNAME@gmail.com:$YOUR_GMAIL_APP_PASSWORD" > /etc/postfix/sasl_passwd
  postmap hash:/etc/postfix/sasl_passwd
  chmod 600 /etc/postfix/sasl_passwd

  sed -i 's/relayhost\ =/relayhost\ =\ smtp.gmail.com:587/g' /etc/postfix/main.cf

  tee -a /etc/postfix/main.cf >/dev/null <<'EOF'
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_security_options =
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/Entrust_Root_Certification_Authority.pem
smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_tls_session_cache
smtp_tls_session_cache_timeout = 3600s
EOF

  postfix reload

  echo "Proxmox test message $(date)" | mail -s "Proxmox Test from $(hostname)" $YOUR_GMAIL_USERNAME@gmail.com
}

read -t 10 -p "Setup gmail for outgoing smtp mail messages? (Y/n): " REPLY
if [ $? -gt 128 ]; then
  echo "Timed out waiting for input. Defaulting to N!"
  break
fi

case $REPLY in
[yY]*)
  setup_smtp_to_gmail
  ;;
*)
  ;;
esac