#!/bin/bash

set -e

DEB_CONF_RESULT=`debconf-show jitsi-meet-web-config | grep jvb-hostname`
DOMAIN="${DEB_CONF_RESULT##*:}"
# remove whitespace
DOMAIN="$(echo -e "${DOMAIN}" | tr -d '[:space:]')"

echo "-------------------------------------------------------------------------"
echo "This script will:"
echo "- Need a working DNS record pointing to this machine(for domain ${DOMAIN})"
echo "- Download certbot-auto from https://dl.eff.org to /usr/local/sbin"
echo "- Install additional dependencies in order to request Let’s Encrypt certificate"
echo "- If running with jetty serving web content, will stop Jitsi Videobridge"
echo "- Configure and reload nginx or apache2, whichever is used"
echo "- Configure the coturn server to use Let's Encrypt certificate and add required deploy hooks"
echo "- Add command in weekly cron job to renew certificates regularly"
echo ""
echo "You need to agree to the ACME server's Subscriber Agreement (https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf) "
echo "by providing an email address for important account notifications"

echo -n "Enter your email and press [ENTER]: "
read EMAIL

if [ ! -x "$(command -v certbot)" ] ; then
    DISTRO=$(lsb_release -is)
    DISTRO_VERSION=$(lsb_release -rs)
    if [ "$DISTRO" = "Debian" ]; then
        apt-get update
        apt-get -y install certbot
    elif [ "$DISTRO" = "Ubuntu" ]; then
        if [ "$DISTRO_VERSION" = "20.04" ] || [ "$DISTRO_VERSION" = "19.10" ]; then
                apt-get update
                apt-get -y install software-properties-common
                add-apt-repository -y universe
                apt-get update
                apt-get -y install certbot
        elif [ "$DISTRO_VERSION" = "18.04" ]; then
                apt-get update
                apt-get -y install software-properties-common
                add-apt-repository -y universe
                add-apt-repository -y ppa:certbot/certbot
                apt-get update
                apt-get -y install certbot
        fi
    else
        echo "$DISTRO $DISTRO_VERSION is not supported"
        echo "Only Debian 9,10 and Ubuntu 18.04,19.10,20.04 are supported"
        exit 1
    fi
fi

CRON_FILE="/etc/cron.weekly/letsencrypt-renew"
if [ ! -d "/etc/cron.weekly" ] ; then
    mkdir "/etc/cron.weekly"
fi
echo "#!/bin/bash" > $CRON_FILE
echo "/usr/bin/certbot renew >> /var/log/le-renew.log" >> $CRON_FILE

CERT_KEY="/etc/letsencrypt/live/$DOMAIN/privkey.pem"
CERT_CRT="/etc/letsencrypt/live/$DOMAIN/fullchain.pem"

if [ -f /etc/nginx/sites-enabled/$DOMAIN.conf ] ; then

    TURN_CONFIG="/etc/turnserver.conf"
    TURN_HOOK=/etc/letsencrypt/renewal-hooks/deploy/0000-coturn-certbot-deploy.sh
    if [ -f $TURN_CONFIG ] && grep -q "jitsi-meet coturn config" "$TURN_CONFIG" ; then
        mkdir -p $(dirname $TURN_HOOK)

        cp /usr/share/jitsi-meet-turnserver/coturn-certbot-deploy.sh $TURN_HOOK
        chmod u+x $TURN_HOOK
        sed -i "s/jitsi-meet.example.com/$DOMAIN/g" $TURN_HOOK

        /usr/bin/certbot certonly --noninteractive \
        --webroot --webroot-path /usr/share/jitsi-meet \
        -d $DOMAIN \
        --agree-tos --email $EMAIL \
        --deploy-hook $TURN_HOOK
    else
        /usr/bin/certbot certonly --noninteractive \
        --webroot --webroot-path /usr/share/jitsi-meet \
        -d $DOMAIN \
        --agree-tos --email $EMAIL
    fi

    echo "Configuring nginx"

    CONF_FILE="/etc/nginx/sites-available/$DOMAIN.conf"
    CERT_KEY_ESC=$(echo $CERT_KEY | sed 's/\./\\\./g')
    CERT_KEY_ESC=$(echo $CERT_KEY_ESC | sed 's/\//\\\//g')
    sed -i "s/ssl_certificate_key\ \/etc\/jitsi\/meet\/.*key/ssl_certificate_key\ $CERT_KEY_ESC/g" \
        $CONF_FILE
    CERT_CRT_ESC=$(echo $CERT_CRT | sed 's/\./\\\./g')
    CERT_CRT_ESC=$(echo $CERT_CRT_ESC | sed 's/\//\\\//g')
    sed -i "s/ssl_certificate\ \/etc\/jitsi\/meet\/.*crt/ssl_certificate\ $CERT_CRT_ESC/g" \
        $CONF_FILE

    echo "service nginx reload" >> $CRON_FILE
    service nginx reload
elif [ -f /etc/apache2/sites-enabled/$DOMAIN.conf ] ; then

    /usr/bin/certbot certonly --noninteractive \
    --webroot --webroot-path /usr/share/jitsi-meet \
    -d $DOMAIN \
    --agree-tos --email $EMAIL

    echo "Configuring apache2"

    CONF_FILE="/etc/apache2/sites-available/$DOMAIN.conf"
    CERT_KEY_ESC=$(echo $CERT_KEY | sed 's/\./\\\./g')
    CERT_KEY_ESC=$(echo $CERT_KEY_ESC | sed 's/\//\\\//g')
    sed -i "s/SSLCertificateKeyFile\ \/etc\/jitsi\/meet\/.*key/SSLCertificateKeyFile\ $CERT_KEY_ESC/g" \
        $CONF_FILE
    CERT_CRT_ESC=$(echo $CERT_CRT | sed 's/\./\\\./g')
    CERT_CRT_ESC=$(echo $CERT_CRT_ESC | sed 's/\//\\\//g')
    sed -i "s/SSLCertificateFile\ \/etc\/jitsi\/meet\/.*crt/SSLCertificateFile\ $CERT_CRT_ESC/g" \
        $CONF_FILE

    echo "service apache2 reload" >> $CRON_FILE
    service apache2 reload
fi

# the cron file that will renew certificates
chmod a+x $CRON_FILE