#!/bin/bash
# postinst script for jitsi-meet-web-config
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

case "$1" in
    configure)

        # loading debconf
        . /usr/share/debconf/confmodule

        # try to get host from jitsi-videobridge
        db_get jitsi-videobridge/jvb-hostname
        if [ -z "$RET" ] ; then
            # server hostname
            db_set jitsi-videobridge/jvb-hostname "localhost"
            db_input critical jitsi-videobridge/jvb-hostname || true
            db_go
        fi
        JVB_HOSTNAME="$RET"

        # detect dpkg-reconfigure
        RECONFIGURING="false"
        db_get jitsi-meet/jvb-hostname
        JVB_HOSTNAME_OLD=$RET
        if [ -n "$RET" ] && [ ! "$JVB_HOSTNAME_OLD" = "$JVB_HOSTNAME" ] ; then
            RECONFIGURING="true"
            rm -f /etc/jitsi/meet/$JVB_HOSTNAME_OLD-config.js
        fi

        JVB_SERVE="false"
        db_get jitsi-meet/jvb-serve
        if [ -n "$RET" ] && [ "$RET" = "true" ] ; then
            JVB_SERVE="true"
        fi

        # stores the hostname so we will reuse it later, like in purge
        db_set jitsi-meet/jvb-hostname $JVB_HOSTNAME

        NGINX_INSTALL_CHECK="$(dpkg-query -f '${Status}' -W 'nginx' 2>/dev/null | awk '{print $3}' || true)"
        NGINX_EXTRAS_INSTALL_CHECK="$(dpkg-query -f '${Status}' -W 'nginx-extras' 2>/dev/null | awk '{print $3}' || true)"
        if [ "$NGINX_INSTALL_CHECK" = "installed" ] \
           || [ "$NGINX_INSTALL_CHECK" = "unpacked" ] \
           || [ "$NGINX_EXTRAS_INSTALL_CHECK" = "installed" ] \
           || [ "$NGINX_EXTRAS_INSTALL_CHECK" = "unpacked" ] ; then
            FORCE_NGINX="true"
        fi
        APACHE_INSTALL_CHECK="$(dpkg-query -f '${Status}' -W 'apache2' 2>/dev/null | awk '{print $3}' || true)"
        if [ "$APACHE_INSTALL_CHECK" = "installed" ] || [ "$APACHE_INSTALL_CHECK" = "unpacked" ] ; then
            FORCE_APACHE="true"
        fi

        # if first time config ask for certs, or if we are reconfiguring
        if [ -z "$JVB_HOSTNAME_OLD" ] || [ "$RECONFIGURING" = "true" ] ; then
            # SSL for nginx
            db_get jitsi-meet/cert-choice
            CERT_CHOICE="$RET"
            UPLOADED_CERT_CHOICE="I want to use my own certificate"

            if [ "$CERT_CHOICE" = "$UPLOADED_CERT_CHOICE" ] ; then
                db_set jitsi-meet/cert-path-key "/etc/ssl/$JVB_HOSTNAME.key"
                db_input critical jitsi-meet/cert-path-key || true
                db_go
                db_get jitsi-meet/cert-path-key
                CERT_KEY="$RET"
                db_set jitsi-meet/cert-path-crt "/etc/ssl/$JVB_HOSTNAME.crt"
                db_input critical jitsi-meet/cert-path-crt || true
                db_go
                db_get jitsi-meet/cert-path-crt
                CERT_CRT="$RET"
            else
                # create self-signed certs
                CERT_KEY="/etc/jitsi/meet/$JVB_HOSTNAME.key"
                CERT_CRT="/etc/jitsi/meet/$JVB_HOSTNAME.crt"
                HOST="$( (hostname -s; echo localhost) | head -n 1)"
                DOMAIN="$( (hostname -d; echo localdomain) | head -n 1)"
                openssl req -new -newkey rsa:4096 -days 365 -nodes -x509 -subj \
                    "/O=$DOMAIN/OU=$HOST/CN=$JVB_HOSTNAME/emailAddress=webmaster@$HOST.$DOMAIN" \
                    -keyout $CERT_KEY \
                    -out $CERT_CRT
            fi
        fi

        # jitsi meet
        JITSI_MEET_CONFIG="/etc/jitsi/meet/$JVB_HOSTNAME-config.js"
        if [ ! -f $JITSI_MEET_CONFIG ] ; then
            cp /usr/share/doc/jitsi-meet-web-config/config.js $JITSI_MEET_CONFIG
            sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" $JITSI_MEET_CONFIG
        fi

        # this is new install let's configure jvb to serve meet
        # no-nginx, no-apache installed on machine, this is new install or reconfiguring old one which have jvb_serve set
        if [[ -z "$FORCE_NGINX" && -z "$FORCE_APACHE" && ( -z "$JVB_HOSTNAME_OLD" || ( "$JVB_SERVE" = "true" && "$RECONFIGURING" = "true" )) ]] ; then

            JVB_ETC_CONFIG="/etc/jitsi/videobridge/config"
            JVB_CONFIG="/etc/jitsi/videobridge/sip-communicator.properties"

            # this is a reconfigure, lets just delete old links
            if [ "$RECONFIGURING" = "true" ] ; then
                rm -f $JVB_CONFIG
            fi

            # we will write to the file if missing create it
            if [ ! -f $JVB_CONFIG ] ; then
                touch $JVB_CONFIG
            fi

            # configure jvb
            echo "AUTHBIND=yes" >> $JVB_ETC_CONFIG
            sed -i "s/JVB_OPTS=.*/JVB_OPTS=--apis=rest,xmpp/g" $JVB_ETC_CONFIG

            echo "org.jitsi.videobridge.rest.jetty.host=::" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.port=443" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.ProxyServlet.hostHeader=$JVB_HOSTNAME" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.ProxyServlet.pathSpec=/http-bind" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.ProxyServlet.proxyTo=http://localhost:5280/http-bind" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.ResourceHandler.resourceBase=/usr/share/jitsi-meet" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.ResourceHandler.alias./config.js=/etc/jitsi/meet/$JVB_HOSTNAME-config.js" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.ResourceHandler.alias./interface_config.js=/usr/share/jitsi-meet/interface_config.js" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.ResourceHandler.alias./logging_config.js=/usr/share/jitsi-meet/logging_config.js" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.RewriteHandler.regex=^/([a-zA-Z0-9]+)$" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.RewriteHandler.replacement=/" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.SSIResourceHandler.paths=/" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.tls.port=443" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.TCP_HARVESTER_PORT=443" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.sslContextFactory.keyStorePath=/etc/jitsi/videobridge/$JVB_HOSTNAME.jks" >> $JVB_CONFIG
            echo "org.jitsi.videobridge.rest.jetty.sslContextFactory.keyStorePassword=changeit" >> $JVB_CONFIG

            # configure authbind to allow jvb to bind to privileged ports
            OWNER=$(stat -c '%U' /usr/share/jitsi-videobridge)
            GROUP=$(stat -c '%G' /usr/share/jitsi-videobridge)
            JVB_UID="`id -u $OWNER`"
            if [ ! -f "/etc/authbind/byport/443" ] ; then
                if [ ! -d "/etc/authbind/byport" ] ; then
                        mkdir -p /etc/authbind/byport
                        chmod 755 /etc/authbind
                        chmod 755 /etc/authbind/byport
                fi
                touch /etc/authbind/byport/443
                chown $OWNER /etc/authbind/byport/443
                chmod 755 /etc/authbind/byport/443
            fi

            CERT_P12="/etc/jitsi/videobridge/$JVB_HOSTNAME.p12"
            CERT_JKS="/etc/jitsi/videobridge/$JVB_HOSTNAME.jks"
            # create jks from  certs
            openssl pkcs12 -export \
                -in $CERT_CRT -inkey $CERT_KEY -passout pass:changeit > $CERT_P12
            keytool -importkeystore -destkeystore $CERT_JKS \
                -srckeystore $CERT_P12 -srcstoretype pkcs12 \
                -noprompt -storepass changeit -srcstorepass changeit

            db_set jitsi-meet/jvb-serve "true"

            invoke-rc.d jitsi-videobridge restart
        elif [[ "$FORCE_NGINX" = "true" && ( -z "$JVB_HOSTNAME_OLD" || "$RECONFIGURING" = "true" ) ]] ; then
            # this is a reconfigure, lets just delete old links
            if [ "$RECONFIGURING" = "true" ] ; then
                rm -f /etc/nginx/sites-enabled/$JVB_HOSTNAME_OLD.conf
                rm -f /etc/jitsi/meet/$JVB_HOSTNAME_OLD-config.js
            fi

            # nginx conf
            if [ ! -f /etc/nginx/sites-available/$JVB_HOSTNAME.conf ] ; then
                cp /usr/share/doc/jitsi-meet-web-config/jitsi-meet.example /etc/nginx/sites-available/$JVB_HOSTNAME.conf
                if [ ! -f /etc/nginx/sites-enabled/$JVB_HOSTNAME.conf ] ; then
                    ln -s /etc/nginx/sites-available/$JVB_HOSTNAME.conf /etc/nginx/sites-enabled/$JVB_HOSTNAME.conf
                fi
                sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" /etc/nginx/sites-available/$JVB_HOSTNAME.conf
            fi

            if [ "$CERT_CHOICE" = "$UPLOADED_CERT_CHOICE" ] ; then
                # replace self-signed certificate paths with user provided ones
                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\ $CERT_KEY_ESC/g" \
                    /etc/nginx/sites-available/$JVB_HOSTNAME.conf
                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\ $CERT_CRT_ESC/g" \
                    /etc/nginx/sites-available/$JVB_HOSTNAME.conf
            fi

            invoke-rc.d nginx reload
        elif [[ "$FORCE_APACHE" = "true" && ( -z "$JVB_HOSTNAME_OLD" || "$RECONFIGURING" = "true" ) ]] ; then
            # this is a reconfigure, lets just delete old links
            if [ "$RECONFIGURING" = "true" ] ; then
                a2dissite $JVB_HOSTNAME_OLD.conf
                rm -f /etc/jitsi/meet/$JVB_HOSTNAME_OLD-config.js
            fi

            # apache2 config
            if [ ! -f /etc/apache2/sites-available/$JVB_HOSTNAME.conf ] ; then
                # when creating new config, make sure all needed modules are enabled
                a2enmod rewrite ssl headers proxy_http include
                cp /usr/share/doc/jitsi-meet-web-config/jitsi-meet.example-apache /etc/apache2/sites-available/$JVB_HOSTNAME.conf
                a2ensite $JVB_HOSTNAME.conf
                sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" /etc/apache2/sites-available/$JVB_HOSTNAME.conf
            fi

            if [ "$CERT_CHOICE" = "$UPLOADED_CERT_CHOICE" ] ; then
                # replace self-signed certificate paths with user provided ones
                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\ $CERT_KEY_ESC/g" \
                    /etc/apache2/sites-available/$JVB_HOSTNAME.conf
                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\ $CERT_CRT_ESC/g" \
                    /etc/apache2/sites-available/$JVB_HOSTNAME.conf
            fi

            invoke-rc.d apache2 reload
        fi

        echo "----------------"
        echo ""
        echo "You can now switch to a Let’s Encrypt certificate. To do so, execute:"
        echo "/usr/share/jitsi-meet/scripts/install-letsencrypt-cert.sh"
        echo ""
        echo "----------------"

        # and we're done with debconf
        db_stop
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0
