#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Removes a user from the system
#
# License
# =======
#
# Copyright (C) 2015-2018 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/>.

PROJECT_NAME='freedombone'

export TEXTDOMAIN=${PROJECT_NAME}-rmuser
export TEXTDOMAINDIR="/usr/share/locale"

COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt

UTILS_FILES="/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-*"
for f in $UTILS_FILES
do
    source "$f"
done

APP_FILES="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*"
for f in $APP_FILES
do
    source "$f"
done

read_config_param MY_USERNAME

REMOVE_USERNAME=$1
REMOVE_OPTIONS="$2"

if [ ! "$REMOVE_USERNAME" ]; then
    echo $'Please specify a username to remove'
    exit 1
fi

if [[ "$REMOVE_USERNAME" == "$MY_USERNAME" ]]; then
    echo $'You cannot remove the administrator user'
    exit 2
fi

if [[ $(is_valid_user "$REMOVE_USERNAME") == "0" ]]; then
    echo $'Cannot remove reserved users'
    exit 3
fi

if [ ! -d "/home/$REMOVE_USERNAME" ]; then
    echo $"Home directory does not exist for $REMOVE_USERNAME"
    exit 4
fi

if [ ! -f "$COMPLETION_FILE" ]; then
    echo $"$COMPLETION_FILE not found"
    exit 5
fi

if ! grep -q "Admin user" "$COMPLETION_FILE"; then
    echo $"No admin user specified in $COMPLETION_FILE"
    exit 6
fi

ADMIN_USERNAME=$(get_completion_param "Admin user")
if [ ! "$ADMIN_USERNAME" ]; then
    echo $"No admin username specified in $COMPLETION_FILE"
    exit 7
fi

if [[ "$REMOVE_USERNAME" == "$ADMIN_USERNAME" ]]; then
    echo $"The administrator user cannot be removed"
    exit 8
fi

if [[ "$REMOVE_OPTIONS" != '-f' && "$REMOVE_OPTIONS" != '-y' && "$REMOVE_OPTIONS" != '--force' ]]; then
    echo $'>>> REMOVE USER <<<'
    read -r -p $"Do you really wish to remove the user '$REMOVE_USERNAME' (y/n) ?" yn
    if [[ $yn != 'y' && $yn != 'Y' && $yn != 'yes' && $yn != 'Yes' && $yn != 'YES' ]]; then
        echo $"User $REMOVE_USERNAME was not removed"
        exit 9
    fi
else
    echo $"Forced removal of user $REMOVE_USERNAME"
fi

if [ -f /etc/nginx/.htpasswd ]; then
    if grep -q "${REMOVE_USERNAME}:" /etc/nginx/.htpasswd; then
        htpasswd -D /etc/nginx/.htpasswd "$REMOVE_USERNAME"
    fi
fi

# remove gpg keys
if [ -d "/home/$REMOVE_USERNAME/.gnupg" ]; then
    shred -zu "/home/$REMOVE_USERNAME/.gnupg/"*
fi

# remove ssh keys
if [ -d "/home/$REMOVE_USERNAME/.ssh" ]; then
    shred -zu "/home/$REMOVE_USERNAME/.ssh/"*
fi

echo $'Detecting installed apps...'
detect_apps
get_apps_installed_names
# shellcheck disable=SC2068
for app_name in ${APPS_INSTALLED_NAMES[@]}
do
    if [[ $(function_exists "remove_user_${app_name}") == "1" ]]; then
        echo $"Removing user from ${app_name}"
        app_load_variables "${app_name}"
        "remove_user_${app_name}" "$REMOVE_USERNAME"
        if grep -q "${app_name}_${REMOVE_USERNAME}" "$APP_USERS_FILE"; then
            sed -i "/${app_name}_${REMOVE_USERNAME}/d" "$APP_USERS_FILE"
        fi
    fi
done

chmod 600 /etc/shadow
chmod 600 /etc/gshadow
userdel -r "$REMOVE_USERNAME"
groupdel "$REMOVE_USERNAME"
chmod 0000 /etc/shadow
chmod 0000 /etc/gshadow

if [ -d "/home/$REMOVE_USERNAME" ]; then
    rm -rf "/home/${REMOVE_USERNAME:?}"
fi

echo $"User $REMOVE_USERNAME was removed"

exit 0