#!/usr/bin/env bash
#
# generate_dkim.sh
# Generate a new DKIM selector for a domain for Docker-Mailserver.
#
# Usage:
#   ./generate_dkim.sh <domain>
#
# Example:
#   ./generate_dkim.sh knusperkerne.de
#

DOMAIN="$1"
CONTAINER="mailserver"      # Name of your DMS container
SELECTOR="mail"             # Default DKIM selector
DKIM_PATH="/tmp/docker-mailserver/opendkim/keys/$DOMAIN"

if [ -z "$DOMAIN" ]; then
    echo "Usage: $0 <domain>"
    exit 1
fi

echo "Generating DKIM key for domain: $DOMAIN"
echo "Selector: $SELECTOR"
echo

# Generate DKIM key inside the DMS container
docker exec "$CONTAINER" \
  setup config dkim \
  --domain "$DOMAIN" \
  --selector "$SELECTOR" \
  --bits 2048

if [ $? -ne 0 ]; then
    echo "ERROR: DKIM generation failed."
    exit 1
fi

echo "DKIM key generated successfully."
echo

# Show public DKIM key for DNS
echo "Your DKIM TXT record (add to DNS):"
echo "----------------------------------"
docker exec "$CONTAINER" \
  cat "$DKIM_PATH/$SELECTOR.txt"

echo "----------------------------------"
echo
echo "DKIM generation complete."