#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# IRC server application
#
# License
# =======
#
# Copyright (C) 2014-2016 Bob Mottram <bob@robotics.uk.to>
#
# 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'

IRC_PORT=6697
IRC_ONION_PORT=6697

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

irc_variables=(MY_USERNAME
               MY_NAME
               IRC_PORT
               IRC_PASSWORD
               DEFAULT_DOMAIN_NAME
               INSTALLED_WITHIN_DOCKER
               ONION_ONLY)

function remove_user_irc {
    remove_username="$1"

    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 {
    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

    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/${new_username}/.irssi/config
    echo '    autoconnect = "yes";' >> /home/${new_username}/.irssi/config
    echo '  },' >> /home/${new_username}/.irssi/config
    echo '  {' >> /home/${new_username}/.irssi/config
    echo "    address = \"${HOSTNAME}\";" >> /home/${new_username}/.irssi/config
    echo '    chatnet = "Freedombone";' >> /home/${new_username}/.irssi/config
    echo "    port = \"${IRC_PORT}\";" >> /home/${new_username}/.irssi/config
    echo '    use_ssl = "yes";' >> /home/${new_username}/.irssi/config
    echo '    ssl_verify = "no";' >> /home/${new_username}/.irssi/config
    echo '    autoconnect = "yes";' >> /home/${new_username}/.irssi/config

    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/${new_username}/.irssi/config
    echo "  core = { real_name = \"$MY_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

    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 50 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

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

            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 -y remove --purge ngircd
    apt-get -y remove --purge irssi
    if [ -d /etc/ngircd ]; then
        rm -rf /etc/ngircd
    fi
    iptables -D INPUT -p tcp --dport ${IRC_PORT}  -j ACCEPT
    iptables -D INPUT -p tcp --dport 1024:65535 --sport ${IRC_PORT} -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings
    function_check remove_onion_service
    remove_onion_service irc ${IRC_ONION_PORT}
    sed -i '/install_irc/d' ${COMPLETION_FILE}
    sed -i '/IRC /d' ${COMPLETION_FILE}
    sed -i '/configure_firewall_for_irc/d' ${COMPLETION_FILE}
}

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

    OPEN_PORTS+=("IRC      $IRC_PORT")
    echo 'configure_firewall_for_irc' >> ${COMPLETION_FILE}
}

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

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

    if [ ! -f /etc/ssl/certs/ngircd.dhparam ]; 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

    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|;CertFile = /etc/ssl/certs/server.crt|CertFile = /etc/ssl/certs/ngircd.crt|g' /etc/ngircd/ngircd.conf
    sed -i 's|;DHFile = /etc/ngircd/dhparams.pem|DHFile = /etc/ssl/certs/ngircd.dhparam|g' /etc/ngircd/ngircd.conf
    sed -i 's|;KeyFile = /etc/ssl/private/server.key|KeyFile = /etc/ssl/private/ngircd.key|g' /etc/ngircd/ngircd.conf
    sed -i "s/;Ports =.*/Ports = ${IRC_PORT}/1" /etc/ngircd/ngircd.conf
    sed -i "s/;Ports =.*/Ports = ${IRC_PORT}/2" /etc/ngircd/ngircd.conf
    sed -i "s/;Name = #ngircd/Name = #${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_PORT} ${IRC_ONION_PORT})

    systemctl restart ngircd

    add_watchdog_daemon ngircd

    if ! grep -q $"IRC Server" /home/${MY_USERNAME}/README; then
        echo '' >> /home/${MY_USERNAME}/README
        echo '' >> /home/${MY_USERNAME}/README
        echo $'IRC Server' >> /home/${MY_USERNAME}/README
        echo '==========' >> /home/${MY_USERNAME}/README
        echo $'To connect to your IRC server in irssi:' >> /home/${MY_USERNAME}/README
        echo '' >> /home/${MY_USERNAME}/README
        if [[ ${ONION_ONLY} != 'yes' ]]; then
            echo "  irssi" >> /home/${MY_USERNAME}/README
            echo "  /server add -auto -ssl $DEFAULTDOMAIN $IRC_PORT" >> /home/${MY_USERNAME}/README
            echo "  /connect $DEFAULT_DOMAIN_NAME" >> /home/${MY_USERNAME}/README
        else
            echo "  usetorwith irssi" >> /home/${MY_USERNAME}/README
            echo "  /server add -auto $IRC_ONION_HOSTNAME $IRC_PORT" >> /home/${MY_USERNAME}/README
            echo "  /connect $IRC_ONION_HOSTNAME" >> /home/${MY_USERNAME}/README
        fi
        echo "  /join #${PROJECT_NAME}" >> /home/${MY_USERNAME}/README
        chown ${MY_USERNAME}:${MY_USERNAME} /home/${MY_USERNAME}/README
        chmod 600 /home/${MY_USERNAME}/README
    fi

    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 -y install irssi

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

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

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

    install_completed irc_client
}

function install_irc {
    install_irc_server
    install_irc_client
    APP_INSTALLED=1
}

# NOTE: deliberately no exit 0
