#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# IRC server application
#
# License
# =======
#
# Copyright (C) 2014-2016 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/>.

VARIANTS='full full-vim chat'

IN_DEFAULT_INSTALL=1
SHOW_ON_ABOUT=1

IRC_BOUNCER_PORT=6697
IRC_ONION_PORT=8098
IRC_PORT=6698

# An optional password to log into IRC. This applies to all users
IRC_PASSWORD=

# Number of entries for the bouncer to buffer
IRC_BUFFER_LENGTH=300

irc_variables=(MY_USERNAME
               MY_NAME
               IRC_PORT
               IRC_BOUNCER_PORT
               IRC_PASSWORD
               IRC_ONION_HOSTNAME
               IRC_OPERATOR_PASSWORD
               DEFAULT_DOMAIN_NAME
               INSTALLED_WITHIN_DOCKER
               IRC_BUFFER_LENGTH
               ONION_ONLY)

function start_irc_bouncer {
    update_default_domain
    if [ ! -f /home/znc/.znc/znc.pem ]; then
        # no certificate exists
        su -c 'znc -p' - znc
    else
        # an existing certificate is being used
        su -c 'znc' - znc
    fi
}

function stop_irc_bouncer {
    pkill znc
}

function create_irssi_config {
    new_username="$1"

    read_config_param IRC_BOUNCER_PORT
    read_config_param IRC_ONION_PORT
    read_config_param IRC_PASSWORD

    new_name="$2"
    if [ ${#new_name} -eq 0 ]; then
        new_name="$new_username"
    fi

    echo 'servers = (' > /home/${new_username}/.irssi/config
    echo '  {' >> /home/${new_username}/.irssi/config
    echo '    address = "chat.freenode.net";' >> /home/${new_username}/.irssi/config
    echo '    chatnet = "Freenode";' >> /home/${new_username}/.irssi/config
    echo '    port = "6667";' >> /home/${new_username}/.irssi/config
    echo '    autoconnect = "no";' >> /home/${new_username}/.irssi/config
    echo '  },' >> /home/${new_username}/.irssi/config
    echo '  {' >> /home/${new_username}/.irssi/config
    echo '    address = "irc.oftc.net";' >> /home/${new_username}/.irssi/config
    echo '    chatnet = "OFTC";' >> /home/${new_username}/.irssi/config
    echo '    port = "6667";' >> /home/${new_username}/.irssi/config
    echo '    autoconnect = "no";' >> /home/${new_username}/.irssi/config
    echo '  },' >> /home/${new_username}/.irssi/config
    echo '  {' >> /home/${new_username}/.irssi/config
    echo "    address = \"127.0.0.1\";" >> /home/${new_username}/.irssi/config
    echo '    ssl_verify = "no";' >> /home/${new_username}/.irssi/config
    if [[ ${ONION_ONLY} == 'no' ]]; then
        echo '    use_ssl = "yes";' >> /home/${new_username}/.irssi/config
        echo "    port = \"${IRC_BOUNCER_PORT}\";" >> /home/${new_username}/.irssi/config
    else
        echo '    use_ssl = "no";' >> /home/${new_username}/.irssi/config
        IRC_ONION_HOSTNAME=$(cat ${COMPLETION_FILE} | grep "irc onion domain" | head -n 1 | awk -F ':' '{print $2}')
        echo "    port = \"${IRC_ONION_PORT}\";" >> /home/${new_username}/.irssi/config
    fi
    echo '    chatnet = "Freedombone";' >> /home/${new_username}/.irssi/config
    echo '    autoconnect = "yes";' >> /home/${new_username}/.irssi/config
    if [ ${IRC_PASSWORD} ]; then
        echo "    password = \"${IRC_PASSWORD}\";" >> /home/${new_username}/.irssi/config
    fi
    echo '  }' >> /home/${new_username}/.irssi/config
    echo ');' >> /home/${new_username}/.irssi/config
    echo '' >> /home/${new_username}/.irssi/config
    echo 'chatnets = {' >> /home/${new_username}/.irssi/config
    echo '  Freedombone = {' >> /home/${new_username}/.irssi/config
    echo '    type = "IRC";' >> /home/${new_username}/.irssi/config
    echo '    max_kicks = "1";' >> /home/${new_username}/.irssi/config
    echo '    max_msgs = "4";' >> /home/${new_username}/.irssi/config
    echo '    max_whois = "1";' >> /home/${new_username}/.irssi/config
    echo '  };' >> /home/${new_username}/.irssi/config
    echo '  Freenode = {' >> /home/${new_username}/.irssi/config
    echo '    type = "IRC";' >> /home/${new_username}/.irssi/config
    echo '    max_kicks = "1";' >> /home/${new_username}/.irssi/config
    echo '    max_msgs = "4";' >> /home/${new_username}/.irssi/config
    echo '    max_whois = "1";' >> /home/${new_username}/.irssi/config
    echo '  };' >> /home/${new_username}/.irssi/config
    echo '  OFTC = {' >> /home/${new_username}/.irssi/config
    echo '    type = "IRC";' >> /home/${new_username}/.irssi/config
    echo '    max_kicks = "1";' >> /home/${new_username}/.irssi/config
    echo '    max_msgs = "1";' >> /home/${new_username}/.irssi/config
    echo '    max_whois = "1";' >> /home/${new_username}/.irssi/config
    echo '  };' >> /home/${new_username}/.irssi/config
    echo '};' >> /home/${new_username}/.irssi/config
    echo '' >> /home/${new_username}/.irssi/config
    echo 'channels = (' >> /home/${new_username}/.irssi/config
    echo '  { name = "#freedombone"; chatnet = "Freedombone"; autojoin = "Yes"; },' >> /home/${new_username}/.irssi/config
    echo ');' >> /home/${new_username}/.irssi/config
    echo '' >> /home/${new_username}/.irssi/config
    echo 'settings = {' >> /home/${new_username}/.irssi/config
    echo "  core = { real_name = \"$new_name\"; user_name = \"$new_username\"; nick = \"$new_username\"; };" >> /home/${new_username}/.irssi/config
    echo '  "fe-text" = { actlist_sort = "refnum"; };' >> /home/${new_username}/.irssi/config
    echo '};' >> /home/${new_username}/.irssi/config
    echo 'ignores = ( { level = "CTCPS"; } );' >> /home/${new_username}/.irssi/config

    chown -R ${new_username}:${new_username} /home/${new_username}/.irssi
}

function remove_user_irc_bouncer {
    remove_username="$1"

    if [ -f /home/znc/.znc/configs/znc.conf ]; then
        stop_irc_bouncer
        sed -i "/<User ${remove_username}>/,/</User>/d" /home/znc/.znc/configs/znc.conf
        start_irc_bouncer
    fi
}

function remove_user_irc {
    remove_username="$1"

    remove_user_irc_bouncer ${remove_username}
    if [ -d /home/${remove_username}/.irssi ]; then
        rm -rf /home/${remove_username}/.irssi
    fi
    if [ -d /home/${remove_username}/irclogs ]; then
        rm -rf /home/${remove_username}/irclogs
    fi
}

function add_user_irc_bouncer {
    new_username="$1"
    new_user_password="$2"
    is_admin='true'
    if [ ! $3 ]; then
        is_admin='false'
    fi

    if [[ $(is_valid_user "$new_username") == "0" ]]; then
        return
    fi

    read_config_param IRC_PORT
    read_config_param DEFAULT_DOMAIN_NAME
    if [ ! $2 ]; then
        read_config_param IRC_PASSWORD
        new_user_password="$IRC_PASSWORD"
    fi

    stop_irc_bouncer

    ZNC_SALT="$(dd if=/dev/urandom bs=16c count=1 | md5sum | awk -F ' ' '{print $1}' | cut -c1-20)"
    new_user_hash=$(echo -n "${new_user_password}${ZNC_SALT}" | sha256sum | awk -F ' ' '{print $1}')

    if grep -q "<User ${new_username}>" /home/znc/.znc/configs/znc.conf; then
        # user already exists
        sed -i "s|Hash = .*|Hash = ${new_user_hash}|g" /home/znc/.znc/configs/znc.conf
        sed -i "s|Salt = .*|Salt = ${ZNC_SALT}|g" /home/znc/.znc/configs/znc.conf
        return
    fi

    echo "<User ${new_username}>" >> /home/znc/.znc/configs/znc.conf
    echo "    Admin      = ${is_admin}" >> /home/znc/.znc/configs/znc.conf
    echo "    AltNick = ${new_username}_" >> /home/znc/.znc/configs/znc.conf
    echo '    AppendTimestamp = false' >> /home/znc/.znc/configs/znc.conf
    echo '    AutoClearChanBuffer = true' >> /home/znc/.znc/configs/znc.conf
    echo '    AutoClearQueryBuffer = true' >> /home/znc/.znc/configs/znc.conf
    echo "    Buffer = ${IRC_BUFFER_LENGTH}" >> /home/znc/.znc/configs/znc.conf
    echo '    DenyLoadMod = false' >> /home/znc/.znc/configs/znc.conf
    echo '    DenySetBindHost = false' >> /home/znc/.znc/configs/znc.conf
    echo "    Ident = ${new_username}" >> /home/znc/.znc/configs/znc.conf
    echo '    JoinTries = 10' >> /home/znc/.znc/configs/znc.conf
    echo '    LoadModule = chansaver' >> /home/znc/.znc/configs/znc.conf
    echo '    LoadModule = controlpanel' >> /home/znc/.znc/configs/znc.conf
    echo '    MaxJoins = 10' >> /home/znc/.znc/configs/znc.conf
    echo '    MaxNetworks = 10' >> /home/znc/.znc/configs/znc.conf
    echo '    MaxQueryBuffers = 50' >> /home/znc/.znc/configs/znc.conf
    echo '    MultiClients = true' >> /home/znc/.znc/configs/znc.conf
    echo "    Nick = ${new_username}" >> /home/znc/.znc/configs/znc.conf
    echo '    PrependTimestamp = true' >> /home/znc/.znc/configs/znc.conf
    echo '    QuitMsg = Bye' >> /home/znc/.znc/configs/znc.conf
    echo "    RealName = ${new_username}" >> /home/znc/.znc/configs/znc.conf
    echo '    StatusPrefix = *' >> /home/znc/.znc/configs/znc.conf
    echo '    TimestampFormat = [%H:%M:%S]' >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf
    echo "    <Network ${PROJECT_NAME}>" >> /home/znc/.znc/configs/znc.conf
    echo '        LoadModule = chansaver' >> /home/znc/.znc/configs/znc.conf
    echo '        LoadModule = simple_away' >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf
    echo "        Server     = 127.0.0.1 ${IRC_PORT} ${IRC_PASSWORD}" >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf
    echo "        <Chan #${PROJECT_NAME}>" >> /home/znc/.znc/configs/znc.conf
    echo '        </Chan>' >> /home/znc/.znc/configs/znc.conf
    echo '    </Network>' >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf
    echo '    <Network oftc>' >> /home/znc/.znc/configs/znc.conf
    echo '        LoadModule = chansaver' >> /home/znc/.znc/configs/znc.conf
    echo '        LoadModule = simple_away' >> /home/znc/.znc/configs/znc.conf
    echo '        FloodBurst = 4' >> /home/znc/.znc/configs/znc.conf
    echo '        FloodRate = 1.00' >> /home/znc/.znc/configs/znc.conf
    echo '        IRCConnectEnabled = true' >> /home/znc/.znc/configs/znc.conf
    echo '        Server = irc.oftc.net 6697' >> /home/znc/.znc/configs/znc.conf
    echo '    </Network>' >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf
    echo '    <Network freenode>' >> /home/znc/.znc/configs/znc.conf
    echo '        LoadModule = chansaver' >> /home/znc/.znc/configs/znc.conf
    echo '        LoadModule = simple_away' >> /home/znc/.znc/configs/znc.conf
    echo '        FloodBurst = 4' >> /home/znc/.znc/configs/znc.conf
    echo '        FloodRate = 1.00' >> /home/znc/.znc/configs/znc.conf
    echo '        IRCConnectEnabled = true' >> /home/znc/.znc/configs/znc.conf
    echo '        Server = irc.freenode.net 6697' >> /home/znc/.znc/configs/znc.conf
    echo '    </Network>' >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf
    echo '    <Pass password>' >> /home/znc/.znc/configs/znc.conf
    echo "        Hash = ${new_user_hash}" >> /home/znc/.znc/configs/znc.conf
    echo '        Method = sha256' >> /home/znc/.znc/configs/znc.conf
    echo "        Salt = ${ZNC_SALT}" >> /home/znc/.znc/configs/znc.conf
    echo '    </Pass>' >> /home/znc/.znc/configs/znc.conf
    echo '</User>' >> /home/znc/.znc/configs/znc.conf

    mkdir -p /home/znc/.znc/users/${new_username}/moddata
    mkdir -p /home/znc/.znc/users/${new_username}/networks
    mkdir /home/znc/.znc/users/${new_username}/moddata/chanserver
    mkdir /home/znc/.znc/users/${new_username}/moddata/controlpanel
    mkdir /home/znc/.znc/users/${new_username}/moddata/perform
    mkdir /home/znc/.znc/users/${new_username}/moddata/webadmin
    mkdir -p /home/znc/.znc/users/${new_username}/networks/${PROJECT_NAME}/moddata/chansaver
    mkdir -p /home/znc/.znc/users/${new_username}/networks/${PROJECT_NAME}/moddata/simple_away

    mkdir -p /home/znc/.znc/moddata/webadmin

    chown -R znc:znc /home/znc/.znc

    start_irc_bouncer
}

function add_user_irc {
    new_username="$1"
    new_user_password="$2"

    IRC_PASSWORD=$(cat /etc/ngircd/ngircd.conf | grep "Password =" | head -n 1 | awk -F '=' '{print $2}')
    if [ ${#IRC_PASSWORD} -lt 2 ]; then
        IRC_PASSWORD=
    fi

    if [ ! -d /home/${new_username}/.irssi ]; then
        mkdir /home/${new_username}/.irssi
    fi

    create_irssi_config "${new_username}"
    add_user_irc_bouncer "${new_username}" "${IRC_PASSWORD}"
    echo '0'
}

function run_client_irc {
    irssi
}

function irc_show_password {
    IRC_PASSWORD=$(cat /etc/ngircd/ngircd.conf | grep "Password =" | head -n 1 | awk -F '=' '{print $2}')
    dialog --title $"IRC Password" \
           --msgbox "$IRC_PASSWORD" 6 40
}

function irc_set_global_password {
    dialog --title $"IRC Password" \
           --clear \
           --backtitle $"Freedombone Control Panel" \
           --passwordbox $"Password for all IRC users, or press Enter for no password" 10 60 2> $data
    sel=$?
    case $sel in
        0)
            EXISTING_IRC_PASSWORD=$(cat /etc/ngircd/ngircd.conf | grep "Password =" | head -n 1 | awk -F '=' '{print $2}')
            NEW_IRC_PASSWORD=$(<$data)
            sed -i "0,/RE/s/Password =.*/Password =$NEW_IRC_PASSWORD/" /etc/ngircd/ngircd.conf

            # replace the password for all users
            for d in /home/*/ ; do
                IRC_USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
                if [[ $(is_valid_user "$IRC_USERNAME") == "1" ]]; then
                    if [ -f /home/${IRC_USERNAME}/.irssi/config ]; then
                        sed -i "s|$EXISTING_IRC_PASSWORD|$NEW_IRC_PASSWORD|g" /home/${IRC_USERNAME}/.irssi/config
                        chown -R ${IRC_USERNAME}:${IRC_USERNAME} /home/${IRC_USERNAME}/.irssi
                    fi
                fi
            done

            read_config_param DEFAULT_DOMAIN_NAME
            read_config_param IRC_PORT
            read_config_param MY_USERNAME

            stop_irc_bouncer
            sleep 2

            # change the hashes. There are multiple users, but since we're using a global
            # password this doesn't matter
            ZNC_SALT="$(dd if=/dev/urandom bs=16c count=1 | md5sum | awk -F ' ' '{print $1}' | cut -c1-20)"
            new_user_hash=$(echo -n "${NEW_IRC_PASSWORD}${ZNC_SALT}" | sha256sum | awk -F ' ' '{print $1}')
            sed -i "s|Hash = .*|Hash = ${new_user_hash}|g" /home/znc/.znc/configs/znc.conf
            sed -i "s|Salt = .*|Salt = ${ZNC_SALT}|g" /home/znc/.znc/configs/znc.conf

            # change the server password
            sed -i "s|Server     = 127.0.0.1.*|Server     = 127.0.0.1 ${IRC_PORT} ${NEW_IRC_PASSWORD}|g" /home/znc/.znc/configs/znc.conf

            # Update the password in the readme
            sed -i "s|IRC login password.*|IRC login password: $NEW_IRC_PASSWORD|g" /home/$MY_USERNAME/README

            if [ -f $INSTALL_DIR/matrix_irc_bridge/config.yaml ]; then
                sed -i "s|password: .*|password: \"$NEW_IRC_PASSWORD\"|g" $INSTALL_DIR/matrix_irc_bridge/config.yaml
                systemctl restart matrix_irc_bridge
            fi

            write_config_param "IRC_PASSWORD" "$NEW_IRC_PASSWORD"

            # restart the daemon for the new password to take effect
            systemctl restart ngircd
            start_irc_bouncer

            dialog --title $"IRC Password" \
                   --msgbox $"The IRC password was changed" 6 40
            ;;
    esac
}

function configure_interactive_irc {
    if [ ! -d /etc/ngircd ]; then
        dialog --title $"IRC Menu" \
               --msgbox $"No IRC server is installed" 6 70
        return
    fi

    while true
    do
        data=$(tempfile 2>/dev/null)
        trap "rm -f $data" 0 1 2 5 15
        dialog --backtitle $"Freedombone Control Panel" \
               --title $"IRC Menu" \
               --radiolist $"Choose an operation:" 14 70 4 \
               1 $"Set a password for all IRC users" off \
               2 $"Show current IRC login password" off \
               3 $"Exit" on 2> $data
        sel=$?
        case $sel in
            1) break;;
            255) break;;
        esac
        case $(cat $data) in
            1) irc_set_global_password;;
            2) irc_show_password;;
            3) break;;
        esac
    done
}

function install_interactive_irc {
    echo -n ''
    APP_INSTALLED=1
}

function change_password_irc {
    echo -n ''
}

function reconfigure_irc {
    echo -n ''
}

function upgrade_irc {
    echo -n ''
}

function backup_local_irc {
    echo -n ''
}

function restore_local_irc {
    echo -n ''
}

function backup_remote_irc {
    echo -n ''
}

function restore_remote_irc {
    echo -n ''
}

function remove_irc {
    remove_watchdog_daemon ngircd
    systemctl stop ngircd
    apt-get -yq remove --purge ngircd
    apt-get -yq remove --purge irssi
    if [ -d /etc/ngircd ]; then
        rm -rf /etc/ngircd
    fi

    iptables -D INPUT -p tcp --dport 1024:65535 --sport ${IRC_BOUNCER_PORT} -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings
    firewall_remove ${IRC_BOUNCER_PORT} tcp

    function_check remove_onion_service
    remove_onion_service irc ${IRC_ONION_PORT}
    remove_completion_param install_irc
    remove_completion_param configure_firewall_for_irc
    sed -i '/IRC /d' ${COMPLETION_FILE}
    sed -i '/znc 2> /d' /etc/crontab
    stop_irc_bouncer
    if [ -d /home/znc ]; then
        userdel -r znc
    fi
    sed -i '/IRC login/d' /home/$MY_USERNAME/README
}

function configure_firewall_for_irc {
    if [ ! -d /etc/ngircd ]; then
        return
    fi
    if [[ $(is_completed $FUNCNAME) == "1" ]]; then
        return
    fi
    if [[ ${INSTALLED_WITHIN_DOCKER} == "yes" ]]; then
        # docker does its own firewalling
        return
    fi
    if [[ ${ONION_ONLY} != "no" ]]; then
        return
    fi
    iptables -I INPUT -p tcp --dport 1024:65535 --sport ${IRC_BOUNCER_PORT} -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings

    firewall_add IRC ${IRC_BOUNCER_PORT} tcp
    echo 'configure_firewall_for_irc' >> ${COMPLETION_FILE}
}

function install_irc_server {
    if [[ $(app_is_installed irc_server) == "1" ]]; then
        return
    fi
    apt-get -yq install ngircd

    if [ ! -d /etc/ngircd ]; then
        echo $"ERROR: ngircd does not appear to have installed. $CHECK_MESSAGE"
        exit 53
    fi

    # obtain a cert for the default domain
    if [[ "$(cert_exists ${DEFAULT_DOMAIN_NAME} pem)" == "0" ]]; then
        echo $'Obtaining certificate for the main domain'
        create_site_certificate ${DEFAULT_DOMAIN_NAME} 'yes'
    fi

    if [[ "$(cert_exists ${DEFAULT_DOMAIN_NAME})" == "0" ]]; then
        ${PROJECT_NAME}-addcert -h ngircd --dhkey ${DH_KEYLENGTH}
        function_check check_certificates
        check_certificates ngircd
    fi

    DEFAULTDOMAIN=${DEFAULT_DOMAIN_NAME}

    # create a login password if needed
    if [ ! ${IRC_PASSWORD} ]; then
        IRC_PASSWORD="$(create_password ${MINIMUM_PASSWORD_LENGTH})"
    fi

    if ! grep -q "IRC login password: $IRC_PASSWORD" /home/$MY_USERNAME/README; then
        echo '' >> /home/$MY_USERNAME/README
        echo "IRC login password: $IRC_PASSWORD" >> /home/$MY_USERNAME/README
    else
        sed -i "s|IRC login password.*|IRC login password: $IRC_PASSWORD|g" /home/$MY_USERNAME/README
    fi

    echo '**************************************************' > /etc/ngircd/motd
    echo $'*           F R E E D O M B O N E   I R C        *' >> /etc/ngircd/motd
    echo '*                                                *' >> /etc/ngircd/motd
    echo $'*               Freedom in the Cloud             *' >> /etc/ngircd/motd
    echo '**************************************************' >> /etc/ngircd/motd
    sed -i 's|MotdFile = /etc/ngircd/ngircd.motd|MotdFile = /etc/ngircd/motd|g' /etc/ngircd/ngircd.conf
    sed -i "s/irc@irc.example.com/$MY_EMAIL_ADDRESS/g" /etc/ngircd/ngircd.conf
    sed -i "s/irc.example.net/$DEFAULTDOMAIN/g" /etc/ngircd/ngircd.conf
    sed -i "s|Yet another IRC Server running on Debian GNU/Linux|IRC Server of $DEFAULTDOMAIN|g" /etc/ngircd/ngircd.conf
    sed -i 's/;Password = wealllikedebian/Password =/g' /etc/ngircd/ngircd.conf
    sed -i "s/;Ports =.*/Ports = ${IRC_PORT}/1" /etc/ngircd/ngircd.conf
    if [[ $ONION_ONLY == 'no' ]]; then
        if [ -f /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.pem ]; then
            sed -i "s|;CertFile = /etc/ssl/certs/server.crt|CertFile = /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.pem|g" /etc/ngircd/ngircd.conf
        else
            sed -i "s|;CertFile = /etc/ssl/certs/server.crt|CertFile = /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.crt|g" /etc/ngircd/ngircd.conf
        fi
        sed -i "s|;DHFile = /etc/ngircd/dhparams.pem|DHFile = /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.dhparam|g" /etc/ngircd/ngircd.conf
        sed -i "s|;KeyFile = /etc/ssl/private/server.key|KeyFile = /etc/ssl/private/${DEFAULT_DOMAIN_NAME}.key|g" /etc/ngircd/ngircd.conf
        sed -i "s/;Ports =.*/Ports = ${IRC_PORT}/2" /etc/ngircd/ngircd.conf
    fi
    sed -i "s/;Name = #ngircd/Name = #${PROJECT_NAME}/g" /etc/ngircd/ngircd.conf
    sed -i "s/;Topic = Our ngircd testing channel/Topic = ${PROJECT_NAME} chat channel/g" /etc/ngircd/ngircd.conf
    sed -i 's/;MaxUsers = 23/MaxUsers = 23/g' /etc/ngircd/ngircd.conf
    sed -i "s|;KeyFile = /etc/ngircd/#chan.key|KeyFile = /etc/ngircd/${PROJECT_NAME}.key|g" /etc/ngircd/ngircd.conf
    sed -i "s/;CloakHost = cloaked.host/CloakHost = ${PROJECT_NAME}/g" /etc/ngircd/ngircd.conf
    IRC_SALT="$(create_password 30)"
    if [ -f ${IMAGE_PASSWORD_FILE} ]; then
        IRC_OPERATOR_PASSWORD="$(printf `cat $IMAGE_PASSWORD_FILE`)"
    else
        IRC_OPERATOR_PASSWORD="$(create_password ${MINIMUM_PASSWORD_LENGTH})"
    fi
    sed -i "s|;CloakHostSalt = abcdefghijklmnopqrstuvwxyz|CloakHostSalt = $IRC_SALT|g" /etc/ngircd/ngircd.conf
    sed -i 's/;ConnectIPv4 = yes/ConnectIPv4 = yes/g' /etc/ngircd/ngircd.conf
    sed -i 's/;MorePrivacy = no/MorePrivacy = yes/g' /etc/ngircd/ngircd.conf
    sed -i 's/;RequireAuthPing = no/RequireAuthPing = no/g' /etc/ngircd/ngircd.conf
    sed -i "s/;Name = TheOper/Name = $MY_USERNAME/g" /etc/ngircd/ngircd.conf
    sed -i "s/;Password = ThePwd/Password = $IRC_OPERATOR_PASSWORD/g" /etc/ngircd/ngircd.conf
    sed -i 's|;Listen =.*|Listen = 0.0.0.0,0.0.0.0:9050,127.0.0.1,127.0.0.1:9050|g' /etc/ngircd/ngircd.conf
    if [ ${IRC_PASSWORD} ]; then
        sed -i "0,/RE/s/Password =.*/Password =$IRC_PASSWORD/" /etc/ngircd/ngircd.conf
    fi
    # upgrade a cypher
    sed -i 's|SECURE128|SECURE256|g' /etc/ngircd/ngircd.conf
    mkdir /var/run/ircd
    chown -R irc:irc /var/run/ircd
    mkdir /var/run/ngircd
    touch /var/run/ngircd/ngircd.pid
    chown -R irc:irc /var/run/ngircd

    IRC_ONION_HOSTNAME=$(add_onion_service irc ${IRC_BOUNCER_PORT} ${IRC_ONION_PORT})

    systemctl restart ngircd

    add_watchdog_daemon ngircd

    function_check configure_firewall_for_irc
    configure_firewall_for_irc
    install_completed irc_server
}

function install_irc_client {
    if [[ $(app_is_installed irc_client) == "1" ]]; then
        return
    fi
    apt-get -yq install irssi

    if [ ! -d /home/${MY_USERNAME}/.irssi ]; then
        mkdir /home/${MY_USERNAME}/.irssi
    fi

    create_irssi_config "${MY_USERNAME}" "$MY_NAME"
    install_completed irc_client
}

function install_irc_bouncer {
    if [[ $(app_is_installed irc_bouncer) == "1" ]]; then
        return
    fi

    apt-get -yq -t jessie-backports install znc

    adduser --disabled-login --gecos 'znc' znc

    mkdir -p /home/znc/.znc/configs
    mkdir -p /home/znc/.znc/users

    echo 'AnonIPLimit = 10' > /home/znc/.znc/configs/znc.conf
    echo 'ConnectDelay = 5' >> /home/znc/.znc/configs/znc.conf
    echo 'HideVersion = false' >> /home/znc/.znc/configs/znc.conf
    echo 'MaxBufferSize = 500' >> /home/znc/.znc/configs/znc.conf
    echo 'ProtectWebSessions = true' >> /home/znc/.znc/configs/znc.conf
    echo 'SSLCertFile = /home/znc/.znc/znc.pem' >> /home/znc/.znc/configs/znc.conf
    echo 'ServerThrottle = 30' >> /home/znc/.znc/configs/znc.conf
    echo 'Version = 1.6.2' >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf
    echo '<Listener listener0>' >> /home/znc/.znc/configs/znc.conf
    echo '  AllowIRC = true' >> /home/znc/.znc/configs/znc.conf
    echo '  AllowWeb = false' >> /home/znc/.znc/configs/znc.conf
    echo '  IPv4 = true' >> /home/znc/.znc/configs/znc.conf
    echo '  IPv6 = true' >> /home/znc/.znc/configs/znc.conf
    echo '  Port = 6697' >> /home/znc/.znc/configs/znc.conf
    if [[ ${ONION_ONLY} == 'no' ]]; then
        echo '  SSL = true' >> /home/znc/.znc/configs/znc.conf
    else
        echo '  SSL = false' >> /home/znc/.znc/configs/znc.conf
    fi
    echo '  URIPrefix = /' >> /home/znc/.znc/configs/znc.conf
    echo '</Listener>' >> /home/znc/.znc/configs/znc.conf
    echo '' >> /home/znc/.znc/configs/znc.conf

    if [ $IRC_PORT -ne $IRC_ONION_PORT ]; then
        echo '<Listener listener1>' >> /home/znc/.znc/configs/znc.conf
        echo '  AllowIRC = true' >> /home/znc/.znc/configs/znc.conf
        echo '  AllowWeb = false' >> /home/znc/.znc/configs/znc.conf
        echo '  IPv4 = true' >> /home/znc/.znc/configs/znc.conf
        echo '  IPv6 = true' >> /home/znc/.znc/configs/znc.conf
        echo "  Port = ${IRC_ONION_PORT}" >> /home/znc/.znc/configs/znc.conf
        echo '  SSL = false' >> /home/znc/.znc/configs/znc.conf
        echo '  URIPrefix = /' >> /home/znc/.znc/configs/znc.conf
        echo '</Listener>' >> /home/znc/.znc/configs/znc.conf
        echo '' >> /home/znc/.znc/configs/znc.conf
    fi

    chown -R znc:znc /home/znc/.znc

    add_user_irc_bouncer "${MY_USERNAME}" "${IRC_PASSWORD}" true

    # certificate for use with SSL
    start_irc_bouncer

    function_check cron_add_mins
    cron_add_mins 10 "/usr/bin/znc 2> /dev/null" znc

    install_completed irc_bouncer
}

function install_irc {
    install_irc_server
    install_irc_client
    install_irc_bouncer
    APP_INSTALLED=1
}

# NOTE: deliberately no exit 0
