#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# TURN server functions
#
# License
# =======
#
# Copyright (C) 2016 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

TURN_PORT=3478

function generate_turn_key {
    local turnkey="${1}"
    local filepath="${2}"

    echo "lt-cred-mech" > "${filepath}"
    echo "use-auth-secret" >> "${filepath}"
    echo "static-auth-secret=${turnkey}" >> "${filepath}"
    echo "realm=turn.${DEFAULT_DOMAIN_NAME}" >> "${filepath}"
    echo "cert=$MATRIX_DATA_DIR/${DEFAULT_DOMAIN_NAME}.tls.crt" >> "${filepath}"
    echo "pkey=$MATRIX_DATA_DIR/${DEFAULT_DOMAIN_NAME}.tls.key" >> "${filepath}"
}

function remove_turn {
    firewall_remove ${TURN_PORT}
}

function remove_turn {
    firewall_remove ${TURN_PORT}
    systemctl stop turn
    systemctl disable turn
    if [ -f /etc/systemd/system/turn.service ]; then
        rm /etc/systemd/system/turn.service
    fi
    apt-get -y remove coturn
    rm -rf /var/lib/turn
}

function install_turn {
    export DEBIAN_FRONTEND=noninteractive
    apt-get -yq install coreutils coturn \
            curl file gcc git libevent-2.0-5 \
            libevent-dev libffi-dev libffi6 \
            libgnutls28-dev libjpeg62-turbo \
            libjpeg62-turbo-dev libldap-2.4-2 \
            libldap2-dev libsasl2-dev \
            libsqlite3-dev libssl-dev \
            libssl1.0.0 libtool libxml2 \
            libxml2-dev libxslt1-dev libxslt1.1 \
            make python python-dev \
            python-pip python-psycopg2 \
            python-virtualenv sqlite unzip \
            zlib1g zlib1g-dev

    pip install --upgrade pip
    pip install --upgrade python-ldap
    pip install --upgrade lxml

    if [ ! -d /var/lib/turn ]; then
        mkdir /var/lib/turn
    fi

    turnkey="$(create_password 30)"
    generate_turn_key $turnkey /var/lib/turn/turnserver.conf

    chown -R matrix:matrix /var/lib/turn

    echo '[Unit]' > /etc/systemd/system/turn.service
    echo 'Description=TURN server' >> /etc/systemd/system/turn.service
    echo 'After=network.target nginx.target' >> /etc/systemd/system/turn.service
    echo '' >> /etc/systemd/system/turn.service
    echo '[Service]' >> /etc/systemd/system/turn.service
    echo 'Type=simple' >> /etc/systemd/system/turn.service
    echo 'User=matrix' >> /etc/systemd/system/turn.service
    echo "WorkingDirectory=/var/lib/turn" >> /etc/systemd/system/turn.service
    echo "ExecStart=/usr/bin/turnserver -c /var/lib/turn/turnserver.conf" >> /etc/systemd/system/turn.service
    echo "Environment=REPORT_STATS=\"no\"" >> /etc/systemd/system/turn.service
    echo 'Restart=always' >> /etc/systemd/system/turn.service
    echo 'RestartSec=10' >> /etc/systemd/system/turn.service
    echo '' >> /etc/systemd/system/turn.service
    echo '[Install]' >> /etc/systemd/system/turn.service
    echo 'WantedBy=multi-user.target' >> /etc/systemd/system/turn.service
    systemctl enable turn
    systemctl daemon-reload
    systemctl start turn

    firewall_add turn ${TURN_PORT}
}

# NOTE: deliberately no exit 0