#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Web based administration user interface
# typically abailanle on http://freedombone.local
#
# A background daemon running the freedombone-installer
# command is used to add and remove apps and handle
# initial setup of the box
#
# License
# =======
#
# Copyright © 2014-2018 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/>.

WEBADMIN_LOGIN_TEXT=$"Welcome to ${PROJECT_NAME}"

function web_admin_get_hostname {
    # shellcheck disable=SC2154
    if [ ! "$rootdir" ]; then
        # get the local name (usually freedombone.local) from avahi config
        local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    else
        local_hostname=${PROJECT_NAME}.local
    fi

    # where the web admin files are
    webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
}

function web_admin_configure_installer_daemon {
    if [ -f /etc/systemd/system/webadmin.service ]; then
        return
    fi

    { echo '[Unit]';
      echo 'Description=Installer daemon for web admin';
      echo 'After=network.target';
      echo '';
      echo '[Service]';
      echo 'User=root';
      echo "ExecStart=/usr/local/bin/${PROJECT_NAME}-installer";
      echo "ExecReload=/bin/kill \$MAINPID";
      echo 'KillMode=process';
      echo 'Restart=always';
      echo '';
      echo '[Install]';
      echo 'WantedBy=multi-user.target'; } > /etc/systemd/system/webadmin.service

    systemctl enable webadmin
    systemctl daemon-reload
    systemctl start webadmin
}

function web_admin_avahi {
    if [ -f /etc/avahi/services/webadmin.service ]; then
        return
    fi

    { echo '<?xml version="1.0" standalone="no"?><!--*-nxml-*-->';
      echo '<!DOCTYPE service-group SYSTEM "avahi-service.dtd">';
      echo '<service-group>';
      echo '  <name replace-wildcards="yes">%h http</name>';
      echo '  <service>';
      echo '    <type>_http._tcp</type>';
      echo '    <port>80</port>';
      echo '  </service>';
      echo '  <service>';
      echo '    <type>_https._tcp</type>';
      echo '    <port>443</port>';
      echo '  </service>';
      echo '</service-group>'; } > /etc/avahi/services/webadmin.service
    systemctl restart avahi-daemon
}

function web_admin_create_users {
    web_admin_get_hostname

    users_file="$webadmin_install_dir/users.html"

    if [ -f "$webadmin_install_dir/.setupscreenactive" ]; then
        if [ ! -f "$webadmin_install_dir/.running_install_command" ]; then
            if [ -f "$users_file" ]; then
                rm "$users_file"
            fi
            if [ ! -d "$INSTALL_DIR/tempwebadmin" ]; then
                mkdir -p "$INSTALL_DIR/tempwebadmin"
            fi
            mv "$webadmin_install_dir/userprofile_"*.html "$INSTALL_DIR/tempwebadmin"
            return
        fi
    fi

    ADMIN_USER=$(get_completion_param "Admin user")
    cp "$webadmin_install_dir"/users_template.html "$users_file"
    sed -i '/users list/,/end of users/d' "$users_file"
    sed -i '/<\/body>/d' "$users_file"
    sed -i '/<\/html>/d' "$users_file"

    echo "    <div class=\"row\">" >> "$users_file"
    echo "      <div class=\"column\">" >> "$users_file"

    rm "$webadmin_install_dir/userprofile_"*

    for d in /home/*/ ; do
        USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
        if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
            userfile="$webadmin_install_dir/userprofile_${USERNAME}.html"
            useremail=${USERNAME}@${HOSTNAME}
            GPG_ID=$(su -c "gpg --list-keys '$useremail'" - "$USERNAME" | sed -n '2p' | sed 's/^[ \t]*//')
            if [ -f "/home/$USERNAME/.gnupg/gpg.conf" ]; then
                if grep -q "default-key" "/home/$USERNAME/.gnupg/gpg.conf"; then
                    default_gpg_key=$(grep "default-key" "/home/$USERNAME/.gnupg/gpg.conf")
                    if [[ "$default_gpg_key" != *'#'* ]]; then
                        default_gpg_key=$(grep "default-key" "/home/$USERNAME/.gnupg/gpg.conf" | awk -F ' ' '{print $2}')
                        if [ ${#default_gpg_key} -gt 3 ]; then
                            GPG_ID=$(su -c "gpg --list-keys '$default_gpg_key'" - "$USERNAME" | sed -n '2p' | sed 's/^[ \t]*//')
                        fi
                    fi
                fi
            fi
            pubkey_qrcode="$webadmin_install_dir/images/userprofile_${USERNAME}.png"
            su -c "gpg --armor --export \"$GPG_ID\"" - "$USERNAME" | qrencode -t PNG -o "$pubkey_qrcode"

            { echo '        <div class="chip">';
              echo "          <a href=\"userprofile_${USERNAME}.html\">";
              echo '            <img src="images/admin_users.png" alt="Person" width="96" height="96">';
              echo "            $USERNAME";
              echo '          </a>';
              echo '        </div>'; } >> "$users_file"

            cp "$webadmin_install_dir"/userprofile.html "$userfile"
            sed -i "s|USERNAME|${USERNAME}|g" "$userfile"
            if [[ "$USERNAME" == "$ADMIN_USER" ]]; then
                sed -i "s|USERTYPE|Admin|g" "$userfile"
                sed -i '/remove user button/,/end of remove/d' "$userfile"
            else
                sed -i "s|USERTYPE|User|g" "$userfile"
            fi
            sed -i "s|USEREMAIL|${useremail}|g" "$userfile"
            sed -i "s|USERGPG|${GPG_ID}|g" "$userfile"

            chown www-data:www-data "$userfile"
            chown www-data:www-data "$pubkey_qrcode"
        fi
    done

    { echo '        <div class="chip">';
      echo "          <a href=\"new_user.html\">";
      echo '            <img src="images/admin_users.png" alt="Person" width="96" height="96">';
      echo '            +';
      echo '          </a>';
      echo '        </div>';
      echo '      </div>';
      echo '    </div>';
      echo '  </body>';
      echo '</html>'; } >> "$users_file"

    chown www-data:www-data "$users_file"
}

function web_admin_create_add_apps {
    web_admin_get_hostname

    appslist_add_filename="$webadmin_install_dir/apps_add.html"
    if [ -f "$webadmin_install_dir/.setupscreenactive" ]; then
        if [ ! -f "$webadmin_install_dir/.running_install_command" ]; then
            if [ -f "$appslist_add_filename" ]; then
                rm "$appslist_add_filename"
            fi
            if [ ! -d "$INSTALL_DIR/tempwebadmin" ]; then
                mkdir -p "$INSTALL_DIR/tempwebadmin"
            fi
            mv "$webadmin_install_dir/app_add_"*.html "$INSTALL_DIR/tempwebadmin"
            return
        fi
    fi

    read_config_param DDNS_PROVIDER
    read_config_param ONION_ONLY
    apps_add_template_filename="$webadmin_install_dir/apps_add_template.html"
    pending_installs="$webadmin_install_dir/pending_installs.txt"
    icons_dir="$webadmin_install_dir/icons"
    app_add_template_filename="$webadmin_install_dir/app_add_template.html"
    FILES="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*"

    if [ ! -d "$icons_dir" ]; then
        mkdir -p "$icons_dir"
    fi

    if [ ! -f "$apps_add_template_filename" ]; then
        return
    fi
    cp "$apps_add_template_filename" "$appslist_add_filename"
    sed -i '/<\/body>/d' "$appslist_add_filename"
    sed -i '/<\/html>/d' "$appslist_add_filename"

    available_apps_ctr=0
    app_index=0
    for filename in $FILES
    do
        app_name=$(echo "${filename}" | awk -F '-app-' '{print $2}')

        app_index=0
        app_is_installed=
        # shellcheck disable=SC2068
        for a in ${APPS_INSTALLED[@]}
        do
            installed_app_name=${APPS_INSTALLED_NAMES[$app_index]}
            if [[ "$installed_app_name" == "$app_name" ]]; then
                app_is_installed=1
                break
            fi

            app_index=$((app_index+1))
        done

        # check if the app is pending installation
        app_pending_install=
        if [ -f "$pending_installs" ]; then
            if grep -q "install_${app_name}" "$pending_installs"; then
                app_is_installed=1
                app_pending_install=1
            fi
        fi

        if [ ! $app_is_installed ]; then
            app_filename="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"
            if [ -f "$app_filename" ]; then
                if grep -q "VARIANTS=''" "$app_filename"; then
                    continue
                fi
                if grep -q 'VARIANTS=""' "$app_filename"; then
                    continue
                fi
                # get the icon for the app
                icon_filename="/usr/share/${PROJECT_NAME}/android-app/${app_name}.png"
                if [ -f "$icon_filename" ]; then
                    cp "$icon_filename" "$webadmin_install_dir/icons/${app_name}.png"
                else
                    icon_filename=
                    continue
                fi

                app_name_upper=$(echo "$app_name" | awk '{print toupper($0)}')
                SHORT_DESCRIPTION=
                DESCRIPTION=

                if ! grep -q "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                    continue
                fi
                if grep -q "#${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                    continue
                fi
                SHORT_DESCRIPTION="$(grep "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"

                if grep -q "${app_name_upper}_DESCRIPTION=" "$app_filename"; then
                    DESCRIPTION="$(grep "${app_name_upper}_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"
                fi

                if [ $available_apps_ctr -eq 0 ]; then
                    echo '    <div class="row">' >> "$appslist_add_filename"
                fi

                filename="$webadmin_install_dir/app_${app_name}.html"
                if [ -f "$filename" ]; then
                    rm "$filename"
                fi

                filename="$webadmin_install_dir/app_add_${app_name}.html"

                if [ ! $app_pending_install ]; then
                    { echo '      <div class="column">';
                      echo '        <div>';
                      echo "          <a href=\"app_add_${app_name}.html\">";
                      echo "            <img src=\"icons/${app_name}.png\" style=\"width:100%\">";
                      echo "            <center>${app_name}</center>";
                      echo '          </a>';
                      echo '        </div>';
                      echo '      </div>'; } >> "$appslist_add_filename"
                else
                    { echo '      <div class="column">';
                      echo '        <div>';
                      echo "        <img src=\"icons/${app_name}.png\" style=\"width:100%\">";
                      echo "        <center class=\"installing\">${app_name}</center>";
                      echo '        </div>';
                      echo '      </div>'; } >> "$appslist_add_filename"
                fi

                cp "$app_add_template_filename" "$filename"

                # Replace app variables
                sed -i "s|HOSTNAME|$(hostname)|g" "$filename"
                sed -i "s|APPNAME|${app_name}|g" "$filename"
                sed -i "s|APPDESCRIPTION|${DESCRIPTION}|g" "$filename"

                # remove domain if onion only
                if [[ "$ONION_ONLY" != 'no' ]]; then
                    if grep -q 'install_domain' "$filename"; then
                        sed -i '/install_domain/d' "$filename"
                    fi
                    sed -i "/installappconfirm.php/a <input type=\"hidden\" name=\"install_domain\" value=\"${app_name}.$(hostname)\">" "$filename"
                fi

                # remove freedns if necessary
                if [[ "$DDNS_PROVIDER" != *"freedns"* ]]; then
                    if grep -q 'freedns_code' "$filename"; then
                        sed -i '/freedns_code/d' "$filename"
                    fi
                fi

                available_apps_ctr=$((available_apps_ctr+1))

                # four columns per row
                if [ $available_apps_ctr -eq 4 ]; then
                    echo '    </div>' >> "$appslist_add_filename"
                    available_apps_ctr=0
                fi
            fi
        fi
    done

    if [ ${available_apps_ctr} -gt 0 ]; then
        # Complete the rest of the four column row
        # shellcheck disable=SC2034
        for i in $(seq ${available_apps_ctr} 3)
        do
            { echo '      <div class="column">';
              echo '        <div>';
              echo '        </div>';
              echo '      </div>'; } >> "$appslist_add_filename"
        done
        echo '    </div>' >> "$appslist_add_filename"
    fi

    { echo '    <br><br>';
      echo '  </body>';
      echo '</html>'; } >> "$appslist_add_filename"

    chown -R www-data:www-data "$webadmin_install_dir"
}

function web_admin_create_installed_apps {
    web_admin_get_hostname

    appslist_filename="$webadmin_install_dir/apps.html"
    if [ -f "$webadmin_install_dir/.setupscreenactive" ]; then
        if [ ! -f "$webadmin_install_dir/.running_install_command" ]; then
            if [ -f "$appslist_filename" ]; then
                rm "$appslist_filename"
            fi
            if [ ! -d "$INSTALL_DIR/tempwebadmin" ]; then
                mkdir -p "$INSTALL_DIR/tempwebadmin"
            fi
            mv "$webadmin_install_dir/app_"*.html "$INSTALL_DIR/tempwebadmin"
            return
        fi
    fi

    appslist_template_filename="$webadmin_install_dir/apps_template.html"
    app_template_filename="$webadmin_install_dir/app_template.html"
    icons_dir="$webadmin_install_dir/icons"
    pending_removes="$webadmin_install_dir/pending_removes.txt"

    if [ ! -d "$icons_dir" ]; then
        mkdir -p "$icons_dir"
    fi

    if [ ! -f "$appslist_template_filename" ]; then
        return
    fi
    cp "$appslist_template_filename" "$appslist_filename"

    sed -i '/<\/body>/d' "$appslist_filename"
    sed -i '/<\/html>/d' "$appslist_filename"

    total_apps_ctr=0
    installed_apps_ctr=0
    app_index=0
    # shellcheck disable=SC2068,SC2034
    for a in ${APPS_INSTALLED[@]}
    do
        app_name=${APPS_INSTALLED_NAMES[$app_index]}
        if [ "$app_name" ]; then
            app_filename="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"
            if [ -f "$app_filename" ]; then

                # check if the app is being removed
                app_being_removed=
                if [ -f "$pending_removes" ]; then
                    if grep -q "remove_${app_name}" "$pending_removes"; then
                        app_being_removed=1
                    fi
                fi

                if [ ! $app_being_removed ]; then
                    # get the icon for the app
                    icon_filename="/usr/share/${PROJECT_NAME}/android-app/${app_name}.png"
                    if [ -f "$icon_filename" ]; then
                        cp "$icon_filename" "$webadmin_install_dir/icons/${app_name}.png"
                    else
                        icon_filename=
                    fi

                    app_name_upper=$(echo "$app_name" | awk '{print toupper($0)}')
                    SHORT_DESCRIPTION=
                    DESCRIPTION=

                    if ! grep -q "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                        app_index=$((app_index+1))
                        continue
                    fi
                    if grep -q "#${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                        app_index=$((app_index+1))
                        continue
                    fi
                    SHORT_DESCRIPTION="$(grep "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"

                    if grep -q "${app_name_upper}_DESCRIPTION=" "$app_filename"; then
                        DESCRIPTION="$(grep "${app_name_upper}_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"
                    fi

                    read_config_param "${app_name_upper}_DOMAIN_NAME"
                    read_config_param ONION_ONLY
                    if [[ "$ONION_ONLY" == 'no' ]]; then
                        if grep -q "INSTALLED_ON_DEFAULT_DOMAIN=1" "$app_filename"; then
                            read_config_param DEFAULT_DOMAIN_NAME
                            domain_name=$DEFAULT_DOMAIN_NAME
                        else
                            test_domain_name="${app_name_upper}_DOMAIN_NAME"
                            domain_name=${!test_domain_name}
                        fi
                    else
                        domain_name=$(cat "/var/lib/tor/hidden_service_${app_name}/hostname")
                    fi
                    onion_domain_name=
                    if [ -f "/var/lib/tor/hidden_service_${app_name}/hostname" ]; then
                        onion_domain_name=$(cat "/var/lib/tor/hidden_service_${app_name}/hostname")
                    fi
                    if [ "$domain_name" ]; then
                        if [[ "$domain_name" != *'.onion' ]]; then
                            domain_name="https://${domain_name}"
                        else
                            domain_name="http://${onion_domain_name}"
                        fi
                    fi

                    if [ $installed_apps_ctr -eq 0 ]; then
                        echo '    <div class="row">' >> "$appslist_filename"
                    fi

                    filename="$webadmin_install_dir/app_add_${app_name}.html"
                    if [ -f "$filename" ]; then
                        rm "$filename"
                    fi

                    filename="$webadmin_install_dir/app_${app_name}.html"

                    { echo '      <div class="column">';
                      echo '        <div>';
                      echo "          <a href=\"app_${app_name}.html\">";
                      echo "            <img src=\"icons/${app_name}.png\" style=\"width:100%\">";
                      echo "            <center>${app_name}</center>";
                      echo '          </a>';
                      echo '        </div>';
                      echo '      </div>'; } >> "$appslist_filename"

                    cp "$app_template_filename" "$filename"

                    # Replace app variables
                    sed -i "s|HOSTNAME|$(hostname)|g" "$filename"
                    sed -i "s|APPNAME|${app_name}|g" "$filename"
                    sed -i "s|ONIONURL|http://${onion_domain_name}|g" "$filename"
                    if [[ "$ONION_ONLY" != 'no' ]]; then
                        sed -i '/APPURL/d' "$filename"
                    else
                        sed -i "s|APPURL|${domain_name}|g" "$filename"
                    fi
                    sed -i "s|APPDESCRIPTION|${DESCRIPTION}|g" "$filename"

                    installed_apps_ctr=$((installed_apps_ctr+1))
                    total_apps_ctr=$((total_apps_ctr+1))

                    # four columns per row
                    if [ $installed_apps_ctr -eq 4 ]; then
                        echo '    </div>' >> "$appslist_filename"
                        installed_apps_ctr=0
                    fi
                fi
            fi
        fi
        app_index=$((app_index+1))
    done

    if [ ${installed_apps_ctr} -gt 0 ]; then
        # Complete the rest of the four column row
        # shellcheck disable=SC2034
        for i in $(seq ${installed_apps_ctr} 3)
        do
            { echo '      <div class="column">';
              echo '        <div>';
              echo '        </div>';
              echo '      </div>'; } >> "$appslist_filename"
        done
        echo '    </div>' >> "$appslist_filename"
    fi

    if [ $total_apps_ctr -gt 0 ]; then
        sed -i "/\"appstext\"/d" "$appslist_filename"
    fi

    { echo '    <br><br>';
      echo '  </body>';
      echo '</html>'; } >> "$appslist_filename"

    chown -R www-data:www-data "$webadmin_install_dir"
}

function web_admin_get_language_subdir {
    # Gets the subdirectory for the current language
    # This is an upper case version of the first two characters of
    # the config variable DEFAULT_LANGUAGE

    read_config_param DEFAULT_LANGUAGE
    if [ ! "$DEFAULT_LANGUAGE" ]; then
        echo 'EN'
        return
    fi
    lang_lower="${DEFAULT_LANGUAGE:0:2}"
    echo "$lang_lower" | awk '{print toupper($0)}'
}

function web_admin_onion_only {
    # In onion only mode domain names or ddns codes
    # don't need to be provided
    web_admin_get_hostname

    # shellcheck disable=SC2154
    sed -i '/freedns_code/d' "$rootdir$webadmin_install_dir/app_add_template.html"
    # shellcheck disable=SC2154
    sed -i '/freedns_code/d' "$rootdir$webadmin_install_dir/add_app_confirm_template.html"

    sed -i '/install_domain/d' "$rootdir$webadmin_install_dir/app_add_template.html"
    sed -i '/install_domain/d' "$rootdir$webadmin_install_dir/add_app_confirm_template.html"

    sed -i 's|onion_only=false;|onion_only=true;|g' "$rootdir$webadmin_install_dir/installapp.php"
    sed -i 's|onion_only=false;|onion_only=true;|g' "$rootdir$webadmin_install_dir/installappconfirm.php"

    sed -i 's|setup_domain.html|setup_installing.html|g' "$rootdir$webadmin_install_dir/setupconfirm.php"
}

function web_admin_reset {
    web_admin_get_hostname

    # reset the box back to the setup screen
    if [ -f /etc/nginx/.webadminpasswd ]; then
        rm /etc/nginx/.webadminpasswd
    fi

    if [ -d "$webadmin_install_dir" ]; then
        touch "$webadmin_install_dir/.setupscreenactive"
    fi

    install_web_admin

    systemctl restart nginx
}

function web_admin_setup_login {
    if [ ! -f /usr/bin/htpasswd ]; then
        $INSTALL_PACKAGES apache2-utils
    fi

    # if an nginx password file has not been created for web admin
    if [ -f /etc/nginx/.webadminpasswd ]; then
        return
    fi

    web_admin_get_hostname

    # this file indicates that the setup screen is active
    # and gets removed by freedombone-installer
    if [ ! -f "$webadmin_install_dir/.setupscreenactive" ]; then
        touch "$webadmin_install_dir/.setupscreenactive"
    fi

    webadmin_password="$(create_password "${MINIMUM_PASSWORD_LENGTH}")"

    # create a password for users
    if [ ! -f /etc/nginx/.webadminpasswd ]; then
        touch /etc/nginx/.webadminpasswd
    fi

    # create a password file used by nginx
    echo -n "$webadmin_password" | htpasswd -i -s -c /etc/nginx/.webadminpasswd "admin"
    if ! grep -q 'admin:' /etc/nginx/.webadminpasswd; then
        echo $'/etc/nginx/.webadminpasswd password not created for admin'
        if [ -f /etc/nginx/.webadminpasswd ]; then
            rm /etc/nginx/.webadminpasswd
        fi
        exit 2428956
    fi

    # create a setup page with the initial password inserted
    # and copy it to the index
    cp "$webadmin_install_dir"/setup.html "$webadmin_install_dir"/setup.prev
    cp "$webadmin_install_dir"/setup_confirm_template.html "$webadmin_install_dir"/setup_confirm.html
    sed -i "s|WEBADMINPASSWORD|${webadmin_password}|g" "$webadmin_install_dir/setup.prev"
    sed -i "s|WEBADMINPASSWORD|${webadmin_password}|g" "$webadmin_install_dir/setup_confirm.html"
    cp "$webadmin_install_dir"/setup.prev "$webadmin_install_dir"/index.html

    # if initial setup has not yet happened then create
    # a password file
    if ! grep -q 'install_final' "$COMPLETION_FILE"; then
        echo -n "$webadmin_password" > /root/login.txt
    fi
}

function image_install_web_admin {
    if [ "$INSTALLING_MESH" ]; then
        return
    fi
    language_subdir=$(web_admin_get_language_subdir)
    web_admin_get_hostname
    # shellcheck disable=SC2154
    mkdir -p "$rootdir$webadmin_install_dir"
    cp -r "$rootdir/usr/share/${PROJECT_NAME}/webadmin"/* "$rootdir$webadmin_install_dir"
    cp "$rootdir/usr/share/${PROJECT_NAME}/webadmin/${language_subdir}"/*.html "$rootdir$webadmin_install_dir"
    cp "$rootdir$webadmin_install_dir/${language_subdir}"/index.html "$rootdir$webadmin_install_dir"/index.prev

    # include onion only status in the config file
    # because add/remove app screens alter depending upon this
    if ! grep -q 'ONION_ONLY=' "$rootdir$CONFIGURATION_FILE"; then
        echo "ONION_ONLY=$ONION_ONLY" >> "$rootdir$CONFIGURATION_FILE"
    else
        sed -i "s|ONION_ONLY=.*|ONION_ONLY=$ONION_ONLY|g" "$rootdir$CONFIGURATION_FILE"
    fi

    if [[ "$ONION_ONLY" != 'no' ]]; then
        web_admin_onion_only
    fi
    touch "$rootdir$webadmin_install_dir/.setupscreenactive"

    nginx_file=${rootdir}/etc/nginx/sites-available/${local_hostname}
    { echo 'server {';
      echo '  listen 80 default_server;';
      echo '  #listen [::]:80;';
      echo "  server_name ${local_hostname};";
      echo "  root /var/www/${local_hostname}/htdocs;";
      echo '  index index.html;';
      echo '';
      echo '  access_log /dev/null;';
      echo '  error_log /dev/null;';
      echo '';
      echo '  location ^~ /admin {';
      echo "    #auth_basic \"${WEBADMIN_LOGIN_TEXT}\";";
      echo "    #auth_basic_user_file /etc/nginx/.webadminpasswd;";
      echo "    root /var/www/${local_hostname}/htdocs;";
      echo '    index index.html;';
      echo "    error_page 405 = \$uri;";
      echo '    location ~ \.php {';
      echo '      include snippets/fastcgi-php.conf;';
      echo '      fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;';
      echo '      fastcgi_read_timeout 30;';
      echo '    }';
      echo '  }';
      echo '';
      echo '  location /icons {';
      echo '    autoindex on;';
      echo '    break;';
      echo '  }';
      echo '';
      echo '  rewrite ^/plinth/(.*)$ /api.json last;';
      echo '';
      echo '  location / {';
      echo "    root /var/www/${local_hostname}/htdocs/plinth;";
      echo '    index api.json /api.json;';
      echo "    error_page 405 = \$uri;";
      echo '  }';
      echo '}'; } > "$nginx_file"

    # enable the webadmin site
    chroot "$rootdir" ln -s "/etc/nginx/sites-available/${local_hostname}" /etc/nginx/sites-enabled/
    chroot "$rootdir" chown -R www-data:www-data "/var/www/${local_hostname}/htdocs"
    chroot "$rootdir" chmod g+w "/var/www/${local_hostname}/htdocs"
    chroot "$rootdir" chmod a+w "$webadmin_install_dir"

    { echo '[Unit]';
      echo 'Description=Installer daemon for web admin';
      echo 'After=network.target';
      echo '';
      echo '[Service]';
      echo 'User=root';
      echo "ExecStart=/usr/local/bin/${PROJECT_NAME}-installer";
      echo "ExecReload=/bin/kill \$MAINPID";
      echo 'KillMode=process';
      echo 'Restart=always';
      echo '';
      echo '[Install]';
      echo 'WantedBy=multi-user.target'; } > "$rootdir/etc/systemd/system/webadmin.service"

    chroot "$rootdir" systemctl enable webadmin
}

function regenerate_webadmin_dynamic_dns {
    read_config_param DDNS_PROVIDER
    read_config_param DDNS_USERNAME
    read_config_param DDNS_PASSWORD

    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
    if [ -f "$webadmin_install_dir/dynamicdns_template.html" ]; then
        cp "$webadmin_install_dir/dynamicdns_template.html" "$webadmin_install_dir/dynamicdns.html"
        ddns="$DDNS_PROVIDER"
        if [[ "$ddns" == 'default@freedns.afraid.org' ]]; then
            ddns='freedns'
        fi
        if [[ "$ddns" == 'dyn.com' ]]; then
            ddns='dyn'
        fi
        sed -i "s|\"$ddns\"|\"$ddns\" selected|g" "$webadmin_install_dir/dynamicdns.html"
        sed -i "s|DDNS_USERNAME|$DDNS_USERNAME|g" "$webadmin_install_dir/dynamicdns.html"
        # Note: For security don't populate the password
        #sed -i "s|DDNS_PASSWORD|$DDNS_PASSWORD|g" "$webadmin_install_dir/dynamicdns.html"
        chown www-data:www-data "$webadmin_install_dir/dynamicdns.html"
    fi
}

function webadmin_update_system_monitor {
    test_drive=/dev/sda1
    if ! ls $test_drive; then
        if ls /dev/mmcblk0p2; then
            test_drive=/dev/mmcblk0p2
        else
            test_drive=
        fi
    fi

    disk_use=$(df -h | grep $test_drive)
    disk_use_percent=0
    if [[ "$disk_use" != *"$test_drive"* ]]; then
        disk_use_percent=$(df -h | grep /dev/mmcblk0p1 | awk -F ' ' '{print $5}')
    fi

    used_memory=$(free -m | grep "Mem:" | awk -F ' ' '{print $3}')
    total_memory=$(free -m | grep "Mem:" | awk -F ' ' '{print $2}')
    used_memory_percent=$((used_memory * 100 / total_memory))

    cpu_temperature=0
    if [ -f /sys/class/thermal/thermal_zone0/temp ]; then
        cpu_temp=$(cat /sys/class/thermal/thermal_zone*/temp | head -n 1)
        if [ "$cpu_temp" ]; then
            cpu_temperature=$((cpu_temp / 1000))
        fi
    fi

    disk_io_speed=20
    disk_io_speed_percent=10
    if [ "$test_drive" ]; then
        disk_io_speed=$(hdparm -t $test_drive | awk -F '= ' '{print $2}' | awk -F ' ' '{print $1}' | tail -n 1 | awk -F '.' '{print $1}')
        if [ "$disk_io_speed" ]; then
            disk_io_speed_percent=$((disk_io_speed * 100 / 500))
            if [ $disk_io_speed_percent -gt 100 ]; then
                disk_io_speed_percent=100
            fi
        fi
    fi

    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
    if [ -f "$webadmin_install_dir/system_monitor_template.html" ]; then
        cp "$webadmin_install_dir/system_monitor_template.html" "$webadmin_install_dir/system_monitor.html"

        if [[ "$disk_use_percent" == *'%'* ]]; then
            sed -i "s|<div name=\"diskspace\" class=\"w3-container.*|<div name=\"diskspace\" class=\"w3-container w3-blue w3-round-xlarge\" style=\"width:$disk_use_percent\">$disk_use_percent</div>|g" "$webadmin_install_dir/system_monitor.html"
        fi

        sed -i "s|<div name=\"memory\" class=\"w3-container.*|<div name=\"memory\" class=\"w3-container w3-blue w3-round-xlarge\" style=\"width:${used_memory_percent}%\">${used_memory_percent}%</div>|g" "$webadmin_install_dir/system_monitor.html"

        if [ $cpu_temperature -gt 0 ]; then
            sed -i "s|<div name=\"cputemp\" class=\"w3-container.*|<div name=\"cputemp\" class=\"w3-container w3-blue w3-round-xlarge\" style=\"width:${cpu_temperature}%\">${cpu_temperature}C</div>|g" "$webadmin_install_dir/system_monitor.html"
        else
            sed -i "/\"cputemp\"/d" "$webadmin_install_dir/system_monitor.html"
            sed -i '/titletextcputemp/d' "$webadmin_install_dir/system_monitor.html"
        fi

        sed -i "s|<div name=\"diskio\" class=\"w3-container.*|<div name=\"diskio\" class=\"w3-container w3-blue w3-round-xlarge\" style=\"width:${disk_io_speed_percent}%\">${disk_io_speed} MB/s</div>|g" "$webadmin_install_dir/system_monitor.html"

        chown www-data:www-data "$webadmin_install_dir/system_monitor.html"
    fi
}

function webadmin_change_language {
    read_config_param DEFAULT_LANGUAGE
    language="$DEFAULT_LANGUAGE"

    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
    if [ -f "$webadmin_install_dir/language_template.html" ]; then
        if grep -q "\"$language\"" "$webadmin_install_dir/language_template.html"; then
            cp "$webadmin_install_dir/language_template.html" "$webadmin_install_dir/language.html"
            sed -i "s|\"$language\"|\"$language\" selected|g" "$webadmin_install_dir/language.html"
            chown www-data:www-data "$webadmin_install_dir/language.html"
        fi
    fi
}

function webadmin_update_version {
    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
    if [ -f "$webadmin_install_dir/about.html" ]; then
        VERSION=$(grep "VERSION=" "/usr/local/bin/${PROJECT_NAME}-vars" | grep -v DEBIAN | awk -F '"' '{print $2}')
        versionstr=$"Version $VERSION"
        sed -i "s|\"versiontext\".*|\"versiontext\">$versionstr</p>|g" "$webadmin_install_dir/about.html"
    fi
}

function install_web_admin {
    # This is intended as an admin web user interface
    # similar to Plinth or the yunohost

    # get the language subdirectory name
    # This is usually EN
    language_subdir=$(web_admin_get_language_subdir)

    web_admin_get_hostname

    # whether or not to add authentication to freedombone.local
    basic_auth_str='#auth_basic'
    if grep -q 'install_final' "$COMPLETION_FILE"; then
        # initial installation has completed
        if [ -f /etc/nginx/.webadminpasswd ]; then
            if [ ! -f "$webadmin_install_dir/.setupscreenactive" ]; then
                # a password was created
                basic_auth_str='auth_basic'
            fi
        fi
    fi

    if [ ! -d "$webadmin_install_dir" ]; then
        mkdir -p "$webadmin_install_dir"
    fi

    web_admin_installed=
    if [ -d "/usr/share/${PROJECT_NAME}/webadmin" ]; then
        if [ -d "/usr/share/${PROJECT_NAME}/webadmin/${language_subdir}" ]; then
            cp -r "/usr/share/${PROJECT_NAME}/webadmin"/* "$webadmin_install_dir"
            cp "/usr/share/${PROJECT_NAME}/webadmin/${language_subdir}"/*.html "$webadmin_install_dir"

            cp "$webadmin_install_dir/${language_subdir}"/index.html "$webadmin_install_dir"/index.prev

            if [ -f "$webadmin_install_dir/.setupscreenactive" ]; then
                if [ -f "$webadmin_install_dir/setup.prev" ]; then
                    # We are still waiting for initial setup to happen
                    cp "$webadmin_install_dir"/setup.prev "$webadmin_install_dir"/index.html
                fi
            fi

            # if this is an onion only install then modify some php scripts
            read_config_param ONION_ONLY
            if [[ "$ONION_ONLY" != 'no' ]]; then
                web_admin_onion_only
            fi

            web_admin_installed=1
        else
            echo $"No web admin language subdirectory for ${language_subdir}"
        fi
    else
        echo $"Directory not found /usr/share/${PROJECT_NAME}/webadmin"
    fi

    if [ ! $web_admin_installed ]; then
        placeholderstr=$"This is a placeholder for the web admin panel on ${local_hostname}"
        { echo '<html>';
          echo '  <body>';
          echo "  ${placeholderstr}";
          echo '  </body>';
          echo '</html>'; } > "$webadmin_install_dir/index.html"
    fi

    nginx_file=/etc/nginx/sites-available/$local_hostname
    { echo 'server {';
      echo '  listen 80 default_server;';
      echo '  #listen [::]:80;';
      echo "  server_name ${local_hostname};";
      echo "  root /var/www/${local_hostname}/htdocs;";
      echo '  index index.html;';
      echo '';
      echo '  access_log /dev/null;';
      echo '  error_log /dev/null;';
      echo '';
      echo '  location ^~ /admin {';
      echo "    ${basic_auth_str} \"${WEBADMIN_LOGIN_TEXT}\";";
      echo "    ${basic_auth_str}_user_file /etc/nginx/.webadminpasswd;";
      echo "    root /var/www/${local_hostname}/htdocs;";
      echo '    index index.html;';
      echo "    error_page 405 = \$uri;";
      echo '    location ~ \.php {';
      echo '      include snippets/fastcgi-php.conf;';
      echo '      fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;';
      echo '      fastcgi_read_timeout 30;';
      echo '    }';
      echo '  }';
      echo '';
      echo '  location /icons {';
      echo '    autoindex on;';
      echo '    break;';
      echo '  }';
      echo '';
      echo '  rewrite ^/plinth/(.*)$ /api.json last;';
      echo '';
      echo '  location / {';
      echo "    root /var/www/${local_hostname}/htdocs/plinth;";
      echo '    index api.json /api.json;';
      echo "    error_page 405 = \$uri;";
      echo '  }';
      echo '}';
      echo '';
      echo 'server {';
      echo '  listen 443 default_server ssl;';
      echo '  #listen [::]:443 ssl;';
      echo "  server_name ${local_hostname};";
      echo "  root /var/www/${local_hostname}/htdocs;";
      echo '  index index.html;';
      echo '';
      echo '  access_log /dev/null;';
      echo '  error_log /dev/null;';
      echo ''; } > "$nginx_file"

    nginx_ssl "${local_hostname}"
    nginx_security_options "${local_hostname}"

    { echo '  add_header Strict-Transport-Security max-age=0;';
      echo '';
      echo '  location ^~ /admin {';
      echo "    ${basic_auth_str} \"${WEBADMIN_LOGIN_TEXT}\";";
      echo "    ${basic_auth_str}_user_file /etc/nginx/.webadminpasswd;";
      echo "    root /var/www/${local_hostname}/htdocs;";
      echo '    index index.html;';
      echo "    error_page 405 = \$uri;";
      echo '    location ~ \.php {';
      echo '      include snippets/fastcgi-php.conf;';
      echo '      fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;';
      echo '      fastcgi_read_timeout 30;';
      echo '    }';
      echo '  }';
      echo '';
      echo '  location /icons {';
      echo '    autoindex on;';
      echo '    break;';
      echo '  }';
      echo '';
      echo '  rewrite ^/plinth/(.*)$ /api.json last;';
      echo '';
      echo '  location / {';
      echo "    root /var/www/${local_hostname}/htdocs/plinth;";
      echo '    index api.json /api.json;';
      echo "    error_page 405 = \$uri;";
      echo '  }';
      echo '}'; } >> "$nginx_file"

    if [ ! -f "/etc/ssl/certs/${local_hostname}.crt" ]; then
        "${PROJECT_NAME}-addcert" -h "${local_hostname}" --dhkey "${DH_KEYLENGTH}"
    fi

    sed -i "s|ssl_certificate .*|ssl_certificate /etc/ssl/certs/${local_hostname}.crt;|g" "$nginx_file"
    sed -i "s|ssl_certificate_key .*|ssl_certificate_key /etc/ssl/private/${local_hostname}.key;|g" "$nginx_file"

    nginx_ensite "${local_hostname}"

    # Compatibility with FreedomBox android app
    # The installed apps get published to a json file called api.json
    # in this directory
    if [ ! -d "/var/www/${local_hostname}/htdocs/plinth" ]; then
        mkdir -p "/var/www/${local_hostname}/htdocs/plinth"
    fi

    web_admin_create_users

    # make list of apps which can be added
    web_admin_create_add_apps

    # make the list of apps
    web_admin_create_installed_apps

    web_admin_setup_login

    chown -R www-data:www-data "/var/www/${local_hostname}/htdocs"
    chmod g+w "/var/www/${local_hostname}/htdocs"
    chmod a+w "$webadmin_install_dir"

    web_admin_avahi

    web_admin_configure_installer_daemon

    regenerate_webadmin_blocklist

    regenerate_webadmin_dynamic_dns

    webadmin_update_system_monitor

    webadmin_change_language

    webadmin_update_version
}

# NOTE: deliberately no exit 0