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#!/usr/bin/env bash
# clusterfix: Quick fixer for DNS cluster issues
# Nathan P. <nathanpat@inmotionhosting.com>
# 0.5a
set -euo pipefail

# Version information
VERSION='0.5a'

# Nice text formatting options
TEXT_BOLD='\e[1m'
TEXT_UNSET='\e[0m'

# Help message
show_help() {
    cat << EOF
$(echo -e "${TEXT_BOLD}")clusterfix:$(echo -e "${TEXT_UNSET}") Quick fixer for DNS cluster issues

USAGE: clusterfix [-m]
    --help -h           Show this message
    --version -v        Show version information
    --message -m        Get a free compliment
EOF
}

# Who doesn't like receiving a compliment?
NICE_MESSAGES=('Is that a new shirt?'
               "I'd back you up in a bear cage deathmatch any day."
               "You're the human version of a perfectly toasted marshmallow."
               "Lookin' good today!"
               'Your taste in socks is impeccable.'
               "Don't listen to Steve. Stamp collecting is cool.")

# Get all our variables and ducks in a row and do all the things
fix_cluster() {
    # First we check what control panel we have. If neither cPanel nor CWP is
    # found, there's no reason to keep going.
    if [[ -e '/usr/local/cpanel/version' ]]; then
        # We use rsync to copy the updated config to resellers on cPanel servers
        if ! command -v rsync > /dev/null; then
            echo 'Error: rsync not found in PATH. clusterfix on cPanel requires rsync to work.' >&2
            exit 1
        fi

        server='cPanel'

        dns_cluster_dir='/var/cpanel/cluster'
        dns_auth_file="${dns_cluster_dir}/root/config/imh"
        dns_command='/opt/dedrads/dns-sync'

        if grep -Evq ': root$' /etc/trueuserowners; then
            resellers="$(grep -Ev ': root$' /etc/trueuserowners | awk -F ': ' '{print $2}' | sort -u)"
        fi
    fi

    if [[ -e '/usr/local/cwp/.conf/cwp.ini' ]]; then
        server='CWP'

        dns_cluster_dir='/opt/imh-cwp-dns'
        dns_auth_file="${dns_cluster_dir}/config/key"
        dns_command='/opt/imh-cwp-dns/update_all_zones'
    fi

    if [[ ! -v server ]]; then
        echo -e "Couldn't detect the server's control panel. Is this a cPanel or CWP server?" >&2
        exit 1
    fi

    # Sometimes there might not be any DNS cluster configuration set up. In
    # that case, we want to let the user know and exit here.
    if [[ ! -e "${dns_auth_file}" ]]; then
        echo 'The root DNS cluster configuration is missing!' >&2

        if [[ "${server}" = 'cPanel' ]]; then
            echo
            echo 'Check WHM => Clusters => DNS Cluster and make sure the IMH DNS backend is' >&2
            echo 'configured and enabled.' >&2
        fi

        exit 1
    fi

    # CWP normally has BIND active, but cPanel might not have a DNS server
    # installed at all. No reason to waste time with this if the domains aren't
    # even using our name servers.
    if [[ "$(systemctl is-active named)" = 'active' ]] || [[ "$(systemctl is-active pdns)" = 'active' ]]; then
        echo -e "${TEXT_BOLD}Heads up!${TEXT_UNSET} BIND or PowerDNS is currently active. Make sure our DNS cluster is"
        echo 'actually being used before continuing.'
        echo
    fi

    echo 'Enter the DNS auth user and key. They look like this:'
    echo '* User: 867530-fernando@example.com'
    echo '*  Key: TURDVkZCcmZ3NUNJSXM5 [...] dlJya0NLVzdYV3NFU1A2'
    echo

    read -erp '🧔 User: ' dns_auth_user
    read -erp '🔑  Key: ' dns_auth_key

    echo

    # Now we update the DNS auth config file with our new values
    if [[ "${server}" = 'cPanel' ]]; then
        sed -Ei "s/^user=.+/user=${dns_auth_user}/" "${dns_auth_file}"
        sed -Ei "s/^apikey=.+/apikey=${dns_auth_key}/" "${dns_auth_file}"

        # We also sync the changes to any resellers
        if [[ -v resellers ]]; then
            for reseller in ${resellers}; do
                rsync -az "${dns_cluster_dir}/root/" "${dns_cluster_dir}/${reseller}/"
            done
        fi

        # Running clusterfix usually means some or none of the domains have
        # up-to-date DNS. So a mass resync is done after the config is updated.
        while read -rd '' domain; do
            domain="$(basename "${domain}" .db)"

            "${dns_command}" -s "${domain}"
        done < <(find /var/named -maxdepth 1 -type f -name '*.db' -print0)
    fi

    if [[ "${server}" = 'CWP' ]]; then
        sed -Ei "s/^.+:.+/${dns_auth_user}:${dns_auth_key}/" "${dns_auth_file}"

        "${dns_command}"
    fi

    echo
    echo 'Done! Check the output above for errors and fix as needed. Have a beefy day! 🌭'
}

# Command options
while [[ "${#}" -gt 0 ]]; do
    case "${1}" in
        --help | -h)
            show_help
            exit 0
            ;;

        --version | -v)
            echo -e "${TEXT_BOLD}clusterfix${TEXT_UNSET} ${VERSION}"
            exit 0
            ;;

        --message | -m)
            echo "${NICE_MESSAGES[${RANDOM} % ${#NICE_MESSAGES[@]}]}"
            exit 0
            ;;

        -*)
            echo -e "Not sure what \"${*}\" is supposed to mean..." >&2
            echo
            show_help
            exit 1
            ;;

        *)
            echo -e "clusterfix doesn't like arguments. Please don't \"${*}\" at it."
            echo
            break
            ;;
    esac
done

# Run main fuction
fix_cluster