#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# XMPP functions
#
# 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

# Directory where XMPP settings are stored
XMPP_DIRECTORY="/var/lib/prosody"
XMPP_PASSWORD=

XMPP_CIPHERS='"EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA"'
XMPP_ECC_CURVE='"secp384r1"'

xmpp_variables=(ONION_ONLY
                INSTALLED_WITHIN_DOCKER
                XMPP_CIPHERS
                XMPP_ECC_CURVE
                XMPP_ECC_CURVE
                MY_USERNAME
                DEFAULT_DOMAIN_NAME
                XMPP_DOMAIN_CODE)

function remove_user_xmpp {
    remove_username="$1"
    ${PROJECT_NAME}-pass -u $remove_username --rmapp xmpp
    ${PROJECT_NAME}-rmxmpp -e "${remove_username}@$HOSTNAME"
}

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

    ${PROJECT_NAME}-pass -u $new_username -a xmpp -p "$new_user_password"

    ${PROJECT_NAME}-addxmpp -e "$new_username@$HOSTNAME" -p "$new_user_password"
    if [ ! "$?" = "0" ]; then
        echo '1'
        return
    fi

    XMPP_CLIENT_DIR=/home/$new_username/.local/share/profanity
    XMPP_CLIENT_ACCOUNTS=$XMPP_CLIENT_DIR/accounts
    if [ ! -d $XMPP_CLIENT_DIR ]; then
        mkdir -p $XMPP_CLIENT_DIR
    fi
    if [ ! -d /home/$new_username/.config/profanity ]; then
        mkdir -p /home/$new_username/.config/profanity
    fi
    echo "[${new_username}@${HOSTNAME}]" > $XMPP_CLIENT_ACCOUNTS
    echo 'enabled=true' >> $XMPP_CLIENT_ACCOUNTS
    echo "jid=${new_username}@${HOSTNAME}" >> $XMPP_CLIENT_ACCOUNTS
    echo 'resource=profanity' >> $XMPP_CLIENT_ACCOUNTS
    echo "muc.service=conference.${HOSTNAME}" >> $XMPP_CLIENT_ACCOUNTS
    echo "muc.nick=${new_username}" >> $XMPP_CLIENT_ACCOUNTS
    echo 'presence.last=online' >> $XMPP_CLIENT_ACCOUNTS
    echo 'presence.login=online' >> $XMPP_CLIENT_ACCOUNTS
    echo 'priority.online=0' >> $XMPP_CLIENT_ACCOUNTS
    echo 'priority.chat=0' >> $XMPP_CLIENT_ACCOUNTS
    echo 'priority.away=0' >> $XMPP_CLIENT_ACCOUNTS
    echo 'priority.xa=0' >> $XMPP_CLIENT_ACCOUNTS
    echo 'priority.dnd=0' >> $XMPP_CLIENT_ACCOUNTS

    echo '[connection]' > /home/$new_username/.config/profanity/profrc
    echo "account=${new_username}@${HOSTNAME}" >> /home/$new_username/.config/profanity/profrc

    chown -R $new_username:$new_username /home/$new_username/.local
    chown -R $new_username:$new_username /home/$new_username/.config
    echo '0'
}

function run_client_xmpp {
    torify profanity
}

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

function change_password_xmpp {
    echo -n ''
}

function reconfigure_xmpp {
    echo -n ''
}

function update_prosody_modules {
    if [ ! -d $INSTALL_DIR/prosody-modules ]; then
        return
    fi
    if [ ! -d /usr/lib/prosody ]; then
        return
    fi

    cd $INSTALL_DIR/prosody-modules
    hg pull
    hg update

    # support onion addresses
    if [ -f $INSTALL_DIR/prosody-modules/mod_onions/mod_onions.lua ]; then
        cp $INSTALL_DIR/prosody-modules/mod_onions/mod_onions.lua /usr/lib/prosody/modules/mod_onions.lua
    fi

    # XEP-0313 message archive management
    # https://modules.prosody.im/mod_mam.html
    # Allows you to download your previous messages onto a new client
    # This only applies if you are not using forward secret crypto
    # such as OTR or OMEMO (eg. OpenPGP)
    if [ -d $INSTALL_DIR/prosody-modules/mod_mam ]; then
        cp $INSTALL_DIR/prosody-modules/mod_mam/*.lua /usr/lib/prosody/modules
    fi

    # XEP-0352 Client State Indication
    # Notifies the server if the app is in the background or not
    if [ -d $INSTALL_DIR/prosody-modules/mod_csi ]; then
        cp $INSTALL_DIR/prosody-modules/mod_csi/*.lua /usr/lib/prosody/modules
    fi

    # XEP-0280 Message Carbons
    # Ensures all messages get delivered to all clients (if you have a mobile and desktop client)
    if [ -d $INSTALL_DIR/prosody-modules/mod_carbons ]; then
        cp $INSTALL_DIR/prosody-modules/mod_carbons/*.lua /usr/lib/prosody/modules
    fi

    # XEP-0198 Stream management
    # Helps mobile apps recover when a device switches networks.
    if [ -d $INSTALL_DIR/prosody-modules/mod_smacks ]; then
        cp $INSTALL_DIR/prosody-modules/mod_smacks/*.lua /usr/lib/prosody/modules
    fi
    if [ -d $INSTALL_DIR/prosody-modules/mod_smacks_offline ]; then
        cp $INSTALL_DIR/prosody-modules/mod_smacks_offline/*.lua /usr/lib/prosody/modules
    fi

    # XEP-0191: blocking
    if [ -d $INSTALL_DIR/prosody-modules/mod_blocking ]; then
        cp $INSTALL_DIR/prosody-modules/mod_blocking/*.lua /usr/lib/prosody/modules
    fi

    # XEP-0016 Privacy lists
    if [ -d $INSTALL_DIR/prosody-modules/mod_privacy_lists ]; then
        cp $INSTALL_DIR/prosody-modules/mod_privacy_lists/*.lua /usr/lib/prosody/modules
    fi

    # If offline then send messages to email
    if [ -d $INSTALL_DIR/prosody-modules/mod_offline_email ]; then
        cp $INSTALL_DIR/prosody-modules/mod_offline_email/*.lua /usr/lib/prosody/modules
    fi
}

function upgrade_xmpp {
    function_check update_prosody_modules
    update_prosody_modules
}

function backup_local_xmpp {
    source_directory=/var/lib/prosody
    if [ -d $source_directory ]; then
        dest_directory=xmpp
        function_check backup_directory_to_usb
        backup_directory_to_usb $source_directory $dest_directory
    fi
}

function restore_local_xmpp {
    if [ -d /var/lib/prosody ]; then
        echo $"Restoring xmpp settings"
        temp_restore_dir=/root/tempxmpp
        function_check restore_directory_from_usb
        restore_directory_from_usb $temp_restore_dir xmpp
        cp -r $temp_restore_dir/var/lib/prosody/* /var/lib/prosody
        if [ ! "$?" = "0" ]; then
            function_check set_user_permissions
            set_user_permissions
            function_check backup_unmount_drive
            backup_unmount_drive
            exit 725
        fi
        rm -rf $temp_restore_dir
        service prosody restart
        chown -R prosody:prosody /var/lib/prosody/*
        echo $"Restore of xmpp settings complete"
    fi
}

function backup_remote_xmpp {
    if [ -d /var/lib/prosody ]; then
        echo $"Backing up the xmpp settings"
        backup_directory_to_friend /var/lib/prosody xmpp
        echo $"Backup of xmpp settings complete"
    fi
}

function restore_remote_xmpp {
    if [ -d /var/lib/prosody ]; then
        echo $"Restoring xmpp settings"
        temp_restore_dir=/root/tempxmpp
        function_check restore_directory_from_friend
        restore_directory_from_friend $temp_restore_dir xmpp
        cp -r $temp_restore_dir/var/lib/prosody/* /var/lib/prosody
        if [ ! "$?" = "0" ]; then
            exit 725
        fi
        rm -rf $temp_restore_dir
        service prosody restart
        chown -R prosody:prosody /var/lib/prosody/*
        echo $"Restore of xmpp settings complete"
    fi
}

function configure_firewall_for_xmpp {
    if [ ! -d /etc/prosody ]; 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
    firewall_add XMPP 5222 tcp
    firewall_add XMPP 5223 tcp
    firewall_add XMPP 5269 tcp
    firewall_add XMPP 5280 tcp
    firewall_add XMPP 5281 tcp
    mark_completed $FUNCNAME
}

function remove_xmpp_client {
    apt-get -yq remove --purge profanity
    remove_completion_param install_xmpp_client
    remove_certs xmpp
}

function remove_xmpp {
    remove_xmpp_client
    firewall_remove 5222 tcp
    firewall_remove 5223 tcp
    firewall_remove 5269 tcp
    firewall_remove 5280 tcp
    firewall_remove 5281 tcp

    function_check remove_onion_service
    remove_onion_service xmpp 5222 5223 5269

    apt-get -yq remove --purge prosody prosody-modules
    if [ -d $INSTALL_DIR/prosody-modules ]; then
        rm -rf $INSTALL_DIR/prosody-modules
    fi
    if [ -d /etc/prosody ]; then
        rm -rf /etc/prosody
    fi
    if [ -d /var/lib/prosody ]; then
        rm -rf /var/lib/prosody
    fi

    remove_completion_param install_xmpp
    sed -i '/xmpp/d' $COMPLETION_FILE
}

function xmpp_email_headers {
    for d in /home/*/ ; do
        USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
        if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
            if [ -f /home/$USERNAME/.muttrc ]; then
                if ! grep -q "Jabber-ID" /home/$USERNAME/.muttrc; then
                    echo "my_hdr Jabber-ID: ${USERNAME}@${HOSTNAME}" >> /home/$USERNAME/.muttrc
                fi
            fi
        fi
    done
}

function install_xmpp_main {
    update_prosody_modules

    if [[ $(app_is_installed xmpp_main) == "1" ]]; then
        return
    fi

    if [[ $ONION_ONLY == 'no' ]]; then
        # obtain a cert for the default domain
        if [[ "$(cert_exists ${DEFAULT_DOMAIN_NAME} pem)" == "0" ]]; then
            echo $'Obtaining certificate for the main domain'
            create_site_certificate ${DEFAULT_DOMAIN_NAME} 'yes'
        fi
    fi

    apt-get -yq install lua-sec lua-bitop
    apt-get -yq install prosody prosody-modules mercurial

    if [ ! -d /etc/prosody ]; then
        echo $"ERROR: prosody does not appear to have installed. $CHECK_MESSAGE"
        exit 52367
    fi

    # obtain the prosody modules
    cd $INSTALL_DIR
    hg clone https://hg.prosody.im/prosody-modules/ prosody-modules
    if [ ! -d $INSTALL_DIR/prosody-modules/mod_onions ]; then
        echo $'mod_onions prosody module could not be found'
        exit 73254
    fi

    # install the onions module
    update_prosody_modules
    if [ ! -f /usr/lib/prosody/modules/mod_onions.lua ]; then
        echo $'mod_onions.lua could not be copied to the prosody modules directory'
        exit 63952
    fi

    # create a certificate
    if [[ "$(cert_exists ${DEFAULT_DOMAIN_NAME} pem)" == "0" ]]; then
        if [[ "$(cert_exists xmpp)" == "0" ]]; then
            ${PROJECT_NAME}-addcert -h xmpp --dhkey ${DH_KEYLENGTH}
            check_certificates xmpp
        fi
    fi

    groupadd default
    usermod -g default prosody

    chown root:default /etc/ssl/private/xmpp.*
    chown root:default /etc/ssl/certs/xmpp.*
    chown root:default /etc/ssl/private/${DEFAULT_DOMAIN_NAME}.*
    chown root:default /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.*

    cp -a /etc/prosody/conf.avail/example.com.cfg.lua /etc/prosody/conf.avail/xmpp.cfg.lua

    if [[ "$(cert_exists ${DEFAULT_DOMAIN_NAME} pem)" == "1" ]]; then
        sed -i "s|/etc/prosody/certs/example.com.key|/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.key|g" /etc/prosody/conf.avail/xmpp.cfg.lua
        sed -i "s|/etc/prosody/certs/example.com.crt|/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem|g" /etc/prosody/conf.avail/xmpp.cfg.lua
    else
        sed -i 's|/etc/prosody/certs/example.com.key|/etc/prosody/certs/xmpp.key|g' /etc/prosody/conf.avail/xmpp.cfg.lua
        sed -i 's|/etc/prosody/certs/example.com.crt|/etc/prosody/certs/xmpp.crt|g' /etc/prosody/conf.avail/xmpp.cfg.lua
    fi
    if ! grep -q "xmpp.dhparam" /etc/prosody/conf.avail/xmpp.cfg.lua; then
        if [[ "$(cert_exists ${DEFAULT_DOMAIN_NAME})" == "1" ]]; then
            sed -i "/certificate =/a\        dhparam = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.dhparam\";" /etc/prosody/conf.avail/xmpp.cfg.lua
        else
            sed -i '/certificate =/a\        dhparam = "/etc/prosody/certs/xmpp.dhparam";' /etc/prosody/conf.avail/xmpp.cfg.lua
        fi
    fi
    if ! grep -q 'options = {"no_sslv2", "no_sslv3" }' /etc/prosody/conf.avail/xmpp.cfg.lua; then
        sed -i '/certificate =/a\        options = {"no_sslv2", "no_sslv3" };' /etc/prosody/conf.avail/xmpp.cfg.lua
    fi
    if ! grep -q 'ciphers =' /etc/prosody/conf.avail/xmpp.cfg.lua; then
        sed -i "/certificate =/a\        ciphers = $XMPP_CIPHERS;" /etc/prosody/conf.avail/xmpp.cfg.lua
    fi
    if ! grep -q 'depth = "1";' /etc/prosody/conf.avail/xmpp.cfg.lua; then
        sed -i '/certificate =/a\        depth = "1";' /etc/prosody/conf.avail/xmpp.cfg.lua
    fi
    if ! grep -q 'curve =' /etc/prosody/conf.avail/xmpp.cfg.lua; then
        sed -i "/certificate =/a\        curve = $XMPP_ECC_CURVE;" /etc/prosody/conf.avail/xmpp.cfg.lua
    fi

    sed -i "s/example.com/$DEFAULT_DOMAIN_NAME/g" /etc/prosody/conf.avail/xmpp.cfg.lua
    sed -i 's/enabled = false -- Remove this line to enable this host//g' /etc/prosody/conf.avail/xmpp.cfg.lua

    if ! grep -q "modules_enabled" /etc/prosody/conf.avail/xmpp.cfg.lua; then
        echo '' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo 'modules_enabled = {' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "bosh"; -- Enable mod_bosh' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "tls"; -- Enable mod_tls' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "saslauth"; -- Enable mod_saslauth' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "onions"; -- Enable chat via onion service' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "mam"; -- Message archive management' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "csi"; -- Client state indication' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "carbons"; -- Message carbons' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "smacks"; -- Stream management' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "smacks_offline"; -- Stream management' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "pep"; -- Personal Eventing Protocol (to support OMEMO)' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "privacy"; -- Privacy lists' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "privacy_lists"; -- Privacy lists' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "blocking"; -- Blocking command' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "roster"; -- Roster versioning' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '  "offline_email"; -- If offline send to email' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '}' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo 'c2s_require_encryption = true' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo 's2s_require_encryption = true' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo 'allow_unencrypted_plain_auth = false' >> /etc/prosody/conf.avail/xmpp.cfg.lua
    fi
    ln -sf /etc/prosody/conf.avail/xmpp.cfg.lua /etc/prosody/conf.d/xmpp.cfg.lua

    if [ -f /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.pem ]; then
        sed -i "s|/etc/prosody/certs/localhost.key|/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.key|g" /etc/prosody/prosody.cfg.lua
        sed -i "s|/etc/prosody/certs/localhost.crt|/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem|g" /etc/prosody/prosody.cfg.lua
    else
        sed -i 's|/etc/prosody/certs/localhost.key|/etc/prosody/certs/xmpp.key|g' /etc/prosody/prosody.cfg.lua
        sed -i 's|/etc/prosody/certs/localhost.crt|/etc/prosody/certs/xmpp.crt|g' /etc/prosody/prosody.cfg.lua
    fi
    if ! grep -q "xmpp.dhparam" /etc/prosody/prosody.cfg.lua; then
        if [ -f /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.dhparam ]; then
            sed -i "/certificate =/a\    dhparam = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.dhparam\";" /etc/prosody/prosody.cfg.lua
        else
            sed -i '/certificate =/a\    dhparam = "/etc/prosody/certs/xmpp.dhparam";' /etc/prosody/prosody.cfg.lua
        fi
    fi
    if ! grep -q 'options = {"no_sslv2", "no_sslv3" }' /etc/prosody/prosody.cfg.lua; then
        sed -i '/certificate =/a\    options = {"no_sslv2", "no_sslv3" };' /etc/prosody/prosody.cfg.lua
    fi
    if ! grep -q 'ciphers =' /etc/prosody/prosody.cfg.lua; then
        sed -i "/certificate =/a\    ciphers = $XMPP_CIPHERS;" /etc/prosody/prosody.cfg.lua
    fi
    if ! grep -q 'depth = "1";' /etc/prosody/prosody.cfg.lua; then
        sed -i '/certificate =/a\    depth = "1";' /etc/prosody/prosody.cfg.lua
    fi
    if ! grep -q 'curve =' /etc/prosody/prosody.cfg.lua; then
        sed -i "/certificate =/a\    curve = $XMPP_ECC_CURVE;" /etc/prosody/prosody.cfg.lua
    fi
    sed -i 's/c2s_require_encryption = false/c2s_require_encryption = true/g' /etc/prosody/prosody.cfg.lua
    if ! grep -q "s2s_require_encryption" /etc/prosody/prosody.cfg.lua; then
        sed -i '/c2s_require_encryption/a\s2s_require_encryption = true' /etc/prosody/prosody.cfg.lua
    fi
    if ! grep -q "allow_unencrypted_plain_auth" /etc/prosody/prosody.cfg.lua; then
        echo 'allow_unencrypted_plain_auth = false' >> /etc/prosody/conf.avail/xmpp.cfg.lua
    fi
    sed -i 's/--"bosh";/"bosh";/g' /etc/prosody/prosody.cfg.lua
    sed -i 's/authentication = "internal_plain"/authentication = "internal_hashed"/g' /etc/prosody/prosody.cfg.lua
    sed -i 's/enabled = false -- Remove this line to enable this host//g' /etc/prosody/prosody.cfg.lua
    if [ -f /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.pem ]; then
        # use an existing cert if possible
        sed -i "s|key = \"/etc/prosody/certs/example.com.key\"|key = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.key\"|g" /etc/prosody/prosody.cfg.lua
        sed -i "s|certificate = \"/etc/prosody/certs/example.com.crt\"|certificate = \"/etc/prosody/certs/${DEFAULT_DOMAIN_NAME}.pem\"|g" /etc/prosody/prosody.cfg.lua
    else
        sed -i 's|key = "/etc/prosody/certs/example.com.key"|key = "/etc/prosody/certs/xmpp.key"|g' /etc/prosody/prosody.cfg.lua
        sed -i 's|certificate = "/etc/prosody/certs/example.com.crt"|certificate = "/etc/prosody/certs/xmpp.crt"|g' /etc/prosody/prosody.cfg.lua
    fi
    sed -i "s/example.com/$DEFAULT_DOMAIN_NAME/g" /etc/prosody/prosody.cfg.lua

    update_default_domain

    if [ ! -d /var/lib/tor ]; then
        echo $'No Tor installation found. xmpp onion site cannot be configured.'
        exit 877367
    fi
    if ! grep -q "hidden_service_xmpp" /etc/tor/torrc; then
        echo 'HiddenServiceDir /var/lib/tor/hidden_service_xmpp/' >> /etc/tor/torrc
        echo "HiddenServicePort 5222 127.0.0.1:5222" >> /etc/tor/torrc
        echo "HiddenServicePort 5269 127.0.0.1:5269" >> /etc/tor/torrc
        echo $'Added onion site for xmpp chat'
    fi

    onion_update
    wait_for_onion_service 'xmpp'

    if [ ! -f /var/lib/tor/hidden_service_xmpp/hostname ]; then
        echo $'xmpp onion site hostname not found'
        exit 65349
    fi
    XMPP_ONION_HOSTNAME=$(cat /var/lib/tor/hidden_service_xmpp/hostname)
    if ! grep -q "${XMPP_ONION_HOSTNAME}" /etc/prosody/conf.avail/xmpp.cfg.lua; then
        echo '' >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo "VirtualHost \"${XMPP_ONION_HOSTNAME}\"" >> /etc/prosody/conf.avail/xmpp.cfg.lua
        echo '    modules_enabled = { "onions" };' >> /etc/prosody/conf.avail/xmpp.cfg.lua
    fi
    set_completion_param "xmpp onion domain" "${XMPP_ONION_HOSTNAME}"

    if [ -f $IMAGE_PASSWORD_FILE ]; then
        XMPP_PASSWORD="$(printf `cat $IMAGE_PASSWORD_FILE`)"
    else
        if [ ${#XMPP_PASSWORD} -lt 8 ]; then
            XMPP_PASSWORD="$(create_password ${MINIMUM_PASSWORD_LENGTH})"
        fi
    fi
    prosodyctl register $MY_USERNAME $DEFAULT_DOMAIN_NAME $XMPP_PASSWORD

    ${PROJECT_NAME}-pass -u $MY_USERNAME -a xmpp -p "$XMPP_PASSWORD"

    function_check configure_firewall_for_xmpp
    configure_firewall_for_xmpp
    xmpp_email_headers

    install_completed xmpp_main
}

function install_xmpp_client {
    if [[ $(app_is_installed xmpp_client) == "1" ]]; then
        return
    fi
    apt-get -yq install profanity

    XMPP_CLIENT_DIR=/home/$MY_USERNAME/.local/share/profanity
    XMPP_CLIENT_ACCOUNTS=$XMPP_CLIENT_DIR/accounts
    if [ ! -d $XMPP_CLIENT_DIR ]; then
        mkdir -p $XMPP_CLIENT_DIR
    fi

    if [[ $ONION_ONLY == 'no' ]]; then
        echo "[${MY_USERNAME}@${DEFAULT_DOMAIN_NAME}]" > $XMPP_CLIENT_ACCOUNTS
        echo 'enabled=true' >> $XMPP_CLIENT_ACCOUNTS
        echo "jid=${MY_USERNAME}@${DEFAULT_DOMAIN_NAME}" >> $XMPP_CLIENT_ACCOUNTS
        echo 'resource=profanity' >> $XMPP_CLIENT_ACCOUNTS
        echo "muc.service=conference.${DEFAULT_DOMAIN_NAME}" >> $XMPP_CLIENT_ACCOUNTS
        echo "muc.nick=${MY_USERNAME}" >> $XMPP_CLIENT_ACCOUNTS
        echo 'presence.last=online' >> $XMPP_CLIENT_ACCOUNTS
        echo 'presence.login=online' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.online=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.chat=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.away=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.xa=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.dnd=0' >> $XMPP_CLIENT_ACCOUNTS
        if [ ${#XMPP_PASSWORD} -gt 2 ]; then
            echo "password=$XMPP_PASSWORD" >> $XMPP_CLIENT_ACCOUNTS
        fi
    fi

    if [ -f /var/lib/tor/hidden_service_xmpp/hostname ]; then
        XMPP_ONION_HOSTNAME=$(cat /var/lib/tor/hidden_service_xmpp/hostname)
        echo "[${MY_USERNAME}@${XMPP_ONION_HOSTNAME}]" >> $XMPP_CLIENT_ACCOUNTS
        if [[ $ONION_ONLY == 'no' ]]; then
            echo 'enabled=false' >> $XMPP_CLIENT_ACCOUNTS
        else
            echo 'enabled=true' >> $XMPP_CLIENT_ACCOUNTS
        fi
        echo "jid=${MY_USERNAME}@${XMPP_ONION_HOSTNAME}" >> $XMPP_CLIENT_ACCOUNTS
        echo 'resource=profanity' >> $XMPP_CLIENT_ACCOUNTS
        echo "muc.service=conference.${XMPP_ONION_HOSTNAME}" >> $XMPP_CLIENT_ACCOUNTS
        echo "muc.nick=${MY_USERNAME}" >> $XMPP_CLIENT_ACCOUNTS
        echo 'presence.last=online' >> $XMPP_CLIENT_ACCOUNTS
        echo 'presence.login=online' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.online=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.chat=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.away=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.xa=0' >> $XMPP_CLIENT_ACCOUNTS
        echo 'priority.dnd=0' >> $XMPP_CLIENT_ACCOUNTS
        if [ ${#XMPP_PASSWORD} -gt 2 ]; then
            echo "password=$XMPP_PASSWORD" >> $XMPP_CLIENT_ACCOUNTS
        fi
    fi

    if [ ! -d /home/$MY_USERNAME/.config/profanity ]; then
        mkdir -p /home/$MY_USERNAME/.config/profanity
    fi
    echo '[connection]' > /home/$MY_USERNAME/.config/profanity/profrc
    echo "account=${MY_USERNAME}@${DEFAULT_DOMAIN_NAME}" >> /home/$MY_USERNAME/.config/profanity/profrc

    chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.local
    chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.config

    install_completed xmpp_client
}

function install_xmpp {
    install_xmpp_main
    install_xmpp_client
    APP_INSTALLED=1
}

# NOTE: deliberately no exit 0
