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

# Removes a SIP phone user from the system

# License
# =======
#
# Copyright (C) 2015 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 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

MY_USERNAME=$1
CONFIG_FILE=/etc/sipwitch.conf
USER_EXISTS="no"

function show_help {
    echo ''
    echo 'freedombone-rmsipuser [username]'
    echo ''
    exit 0
}

function sip_user_exists {
    for line in $(cat $CONFIG_FILE)
    do
        if [[ "$line" == "<user id=\"$MY_USERNAME\">" ]]; then
            USER_EXISTS="yes"
            return
        fi
    done
}

function remove_sip_user {
    USER_FOUND=
    NEW_CONFIG_FILE="${CONFIG_FILE}.new"
    if [ -f $NEW_CONFIG_FILE ]; then
        rm -f $NEW_CONFIG_FILE
    fi
    touch $NEW_CONFIG_FILE
    for line in $(cat $CONFIG_FILE)
    do
        if [ ! $USER_FOUND ]; then
            if [[ "$line" == "<user id=\"$MY_USERNAME\">" ]]; then
                USER_FOUND="yes"
            fi
        fi
        if [ ! $USER_FOUND ]; then
            echo $line >> $NEW_CONFIG_FILE
        else
            if [[ "$line" == '</user>' ]]; then
                USER_FOUND=
            fi
        fi
    done
    mv $NEW_CONFIG_FILE $CONFIG_FILE
}

if [ ! $MY_USERNAME ]; then
    show_help
fi

if [ ! -f $CONFIG_FILE ]; then
    echo "SIP configuration file not found"
    exit 1
fi

# the user must already exist on the system
if [ ! -d /home/$MY_USERNAME ]; then
    echo "User $MY_USERNAME not found"
    exit 2
fi

sip_user_exists

if [[ $USER_EXISTS != "yes" ]]; then
    echo 'User not found within SIP configuration file'
    exit 3
fi

remove_sip_user

service sipwitch restart

echo "SIP user $MY_USERNAME removed"
exit 0