#!/bin/sh

## Variables
CSI="\033["
CEND="${CSI}0m"
CRED="${CSI}1;31m"
CGREEN="${CSI}1;32m"
CYELLOW="${CSI}1;33m"
CBLUE="${CSI}1;34m"

## Functions
f_log() {
    LOG_TYPE=$1
    LOG_MESSAGE=$2

    case "${LOG_TYPE}" in
    "INF")
        echo -e "${CBLUE}=INF= $(date +%Y/%m/%d-%H:%M:%S) ${LOG_MESSAGE}${CEND}"
    ;;
    "SUC")
        echo -e "${CGREEN}=SUC= $(date +%Y/%m/%d-%H:%M:%S) ${LOG_MESSAGE}${CEND}"
    ;;
    "WRN")
        echo -e "${CYELLOW}=WRN= $(date +%Y/%m/%d-%H:%M:%S) ${LOG_MESSAGE}${CEND}"
    ;;
    "ERR")
        echo -e "${CRED}=ERR= $(date +%Y/%m/%d-%H:%M:%S) ${LOG_MESSAGE}${CEND}"
    ;;
    esac
}

f_gen_sites_enabled() {
    if [ "${FRONTEND_SSL}" == "true" ]; then
        template_sites=/nginx/sites-enabled/template_ssl
    else
        template_sites=/nginx/sites-enabled/template
    fi
	if [ "${FRONTEND_TOR}" == "true" ]; then
		if [ -d /tor/${FRONTEND_DOMAIN}/ ]; then
                        ONION_DOMAIN=$(cat /tor/${FRONTEND_DOMAIN}/hostname)
                        echo "HiddenServiceDir /tor/"${FRONTEND_DOMAIN}"/" >> /etc/tor/torrc
                        echo "HiddenServicePort 443 127.0.0.1:443" >> /etc/tor/torrc
			sed -e 's|<frontend_domain>|'${FRONTEND_DOMAIN}'|' \
                            -e 's|<onion_domain>|'${ONION_DOMAIN}'|' ${template_sites} > /nginx/sites-enabled/${FRONTEND_DOMAIN}.conf
		else
			echo "HiddenServiceDir /tor/"${FRONTEND_DOMAIN}"/" >> /etc/tor/torrc 
			echo "HiddenServicePort 443 127.0.0.1:443" >> /etc/tor/torrc 
                        echo "Please restard your container"
			sed -e 's|<frontend_domain>|'${FRONTEND_DOMAIN}'|' ${template_sites} > /nginx/sites-enabled/${FRONTEND_DOMAIN}.conf
                fi     
    else
        sed -e 's|<frontend_domain>|'${FRONTEND_DOMAIN}'|' \
            -e 's|<onion_domain>| |' ${template_sites} > /nginx/sites-enabled/${FRONTEND_DOMAIN}.conf
    fi
}

f_gen_location() {
    container_name=$1
    if [ ! -d /nginx/path.d/${FRONTEND_DOMAIN} ]; then
        mkdir -p /nginx/path.d/${FRONTEND_DOMAIN}
    fi

    if [ "${FRONTEND_PATH}" == "/" ]; then
        path_file=/nginx/path.d/${FRONTEND_DOMAIN}/base.conf
        auth_file=/nginx/auth/${FRONTEND_DOMAIN}/base.auth
    else
        path_file=/nginx/path.d/${FRONTEND_DOMAIN}/${FRONTEND_PATH}.conf
        auth_file=/nginx/auth/${FRONTEND_DOMAIN}/${FRONTEND_PATH}.auth
    fi
    if [ ! -e ${path_file} ]; then
        if [ "${FRONTEND_AUTH}" != "" ]; then
            mkdir -p /nginx/auth/${FRONTEND_DOMAIN}
            sed -e 's|<frontend_domain_max_body_size>|'${FRONTEND_MAX_BODY_SIZE}'|' \
                -e 's|<backend_addr>|'${container_name}'|' \
                -e 's|<backend_port>|'${BACKEND_PORT}'|' \
                -e 's|<frontend_domain>|'${FRONTEND_DOMAIN}'|' \
                -e 's|<frontend_path>|'${FRONTEND_PATH}'|' \
                -e 's|<auth_file>|'${auth_file}'|' /nginx/path.d/template_auth > ${path_file}
            echo "${FRONTEND_AUTH}" > ${auth_file}
        else
            sed -e 's|<frontend_domain_max_body_size>|'${FRONTEND_MAX_BODY_SIZE}'|' \
                -e 's|<backend_addr>|'${container_name}'|' \
                -e 's|<backend_port>|'${BACKEND_PORT}'|' \
                -e 's|<frontend_path>|'${FRONTEND_PATH}'|' /nginx/path.d/template > ${path_file}
        fi
    fi
}

f_gen_certs() {
    container_name=$1
    if [ "${FRONTEND_SSL}" == "true" ]; then
        CERTFILE=/nginx/ssl/certificates/${FRONTEND_DOMAIN}.cert.pem
        KEYFILE=/nginx/ssl/certificates/${FRONTEND_DOMAIN}.key
        CHAINFILE=/nginx/ssl/certificates/${FRONTEND_DOMAIN}.chain.pem
        FULLCHAINFILE=/nginx/ssl/certificates/${FRONTEND_DOMAIN}.crt
        if [ ! -e ${CERTFILE} ] || [ ! -e ${KEYFILE} ] || [ ! -e ${CHAINFILE} ] || [ ! -e ${FULLCHAINFILE} ]; then
            mkdir -p /nginx/www/${FRONTEND_DOMAIN}
            /usr/local/bin/lego -a -m ${EMAIL} -d ${FRONTEND_DOMAIN} --path /nginx/ssl --http :8080 --tls :8443 -k ${FRONTEND_SSLTYPE} run
            if [ $? == 0 ]; then
                head -$(grep -n "END CERTIFICATE" ${FULLCHAINFILE} | head -1 | cut -d: -f1) ${FULLCHAINFILE} > ${CERTFILE}
                tail -$(($(wc -l ${FULLCHAINFILE} | awk '{print $1}')-$(grep -n "END CERTIFICATE" ${FULLCHAINFILE} | head -1 | cut -d: -f1))) ${FULLCHAINFILE} > ${CHAINFILE}
                chown -R ${UID}:${GID} /nginx/ssl/
            fi
            [[ $? == 0 ]] && f_log INF "New Certificate for ${FRONTEND_DOMAIN} generated" || f_log ERR "New Certificate for ${FRONTEND_DOMAIN} not generated"
        fi
    fi
}



f_make_conf() {

    FRONTEND_DOMAIN=mydomain.local
    FRONTEND_MAX_BODY_SIZE=200M
    FRONTEND_SSLTYPE=ec384
    BACKEND_PORT=8080
    FRONTEND_PATH="/"
    FRONTEND_SSL=false
    FRONTEND_AUTH=""
    FRONTEND_TOR=false
    container_name=$1
    IFS=$'\n' 
    if [ "${CONTAINER_LABELS}" != "" ]; then
        for label in ${CONTAINER_LABELS}; do
            case "$(echo ${label} | awk '{print $1}')" in
                "reverse.frontend.domain")
                    FRONTEND_DOMAIN=""
                    FRONTEND_DOMAIN="$(echo ${label} | awk '{print $2}')"
                ;;
                "reverse.frontend.path")
                    FRONTEND_PATH="$(echo ${label} | awk '{print $2}')"
                ;;
                "reverse.frontend.auth")
                    FRONTEND_AUTH="$(echo ${label} | awk '{print $2}')"
                ;;
                "reverse.frontend.ssltype")
                    FRONTEND_SSLTYPE="$(echo ${label} | awk '{print $2}')"
                ;;
                "reverse.frontend.domain_max_body_size")
                    FRONTEND_MAX_BODY_SIZE="$(echo ${label} | awk '{print $2}')"
                ;;
                "reverse.frontend.ssl")
                    FRONTEND_SSL="$(echo ${label} | awk '{print $2}')"
                ;;
                "reverse.frontend.tor")
                    FRONTEND_TOR="$(echo ${label} | awk '{print $2}')"
                ;;
                "reverse.backend.port")
                    BACKEND_PORT="$(echo ${label} | awk '{print $2}')"
                ;;
            esac
        done
        f_log INF "Generate files for ${FRONTEND_DOMAIN}, with path=${FRONTEND_PATH}, auth=${FRONTEND_AUTH}, ssl_type=${FRONTEND_SSLTYPE}, ssl=${FRONTEND_SSL} and port=${BACKEND_PORT}"
        f_gen_location ${container_name}
        f_gen_sites_enabled
        f_gen_certs ${container_name}
    fi
}


# Check /var/run/docker.sock
f_log INF "Check if /var/run/docker.sock exist ..."
ls /var/run/docker.sock > /dev/null 2>&1
if [ $? == 0 ]; then
    f_log INF "/var/run/docker.sock exist ..."
else
    f_log ERR "/var/run/docker.sock don't exist ..."
    exit 1
fi


f_log INF "Start reverse configuration ..."

# Prepare container
f_log INF "Create user 'reverse'"
addgroup -g ${GID} reverse && adduser -H -s /bin/sh -D -G reverse -u ${UID} reverse
f_log INF "Create folder"
mkdir -p /nginx/sites-enabled /nginx /nginx/log /nginx/run /nginx/sites-enabled /nginx/ssl /nginx/ssl/selfsigned/dhparam
mkdir -p /home/reverse/.tor
# Generate file
for container in $(curl --unix-socket /var/run/docker.sock http://localhost/containers/json 2> /dev/null | jq '.[].Names' | sed 's|.*"/\(.*\)"$|\1|;/\[/d;/\]/d'); do 
    CONTAINER_LABELS=$(curl --unix-socket /var/run/docker.sock http://localhost/containers/${container}/json 2> /dev/null | jq '.Config.Labels' | grep -E "reverse\." | sed 's|.*"\(.*\)": "\(.*\)".*$|\1 \2|')
    f_make_conf ${container}
done

f_log INF "Apply permissions"
chown -R reverse:reverse /nginx /etc/s6.d /tor/ /home/reverse/.tor
chmod +x /usr/local/bin/check_certs
find /etc/s6.d -name run -exec chmod +x {} \;
find /etc/s6.d -name finish -exec chmod +x {} \;

f_log SUC "End reverse configuration"


## run s6
if [ $# -gt 0 ]; then
    exec su-exec reverse:reverse "$@"
else
    exec su-exec reverse:reverse /bin/s6-svscan /etc/s6.d      
fi