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

# Adds a SIP phone user to the system

# License
# =======
#
# Copyright (C) 2015-2016 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/>.

PROJECT_NAME='freedombone'

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

MY_USERNAME=
EXTENSION=
PASSWORD=
CONFIG_FILE=/etc/sipwitch.conf
USER_EXISTS="no"

function show_help {
    echo ''
    echo $"${PROJECT_NAME}-addsipuser -u [username] -e [extension] -p [password]"
    echo ''
    exit 0
}

function sip_user_exists {
    IFS=''
    while read line; do
        if [[ "$line" == *"<user id=\"$MY_USERNAME\">" ]]; then
            USER_EXISTS="yes"
            return
        fi
    done < $CONFIG_FILE
}

function update_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
    IFS=''
    while read line; do
        if [ ! $USER_FOUND ]; then
            if [[ "$line" == *"<user id=\"$MY_USERNAME\">" ]]; then
                USER_FOUND="yes"
            fi
        else
            if [[ "$line" == *"<extension>"* ]]; then
                line="<extension>$EXTENSION</extension>"
            fi
            if [[ "$line" == *"<secret>"* ]]; then
                line="<secret>$PASSWORD</secret>"
            fi
            if [[ "$line" == *"<display>"* ]]; then
                line="<display>$MY_USERNAME $EXTENSION</display>"
                USER_FOUND=
            fi
        fi
        echo $line >> $NEW_CONFIG_FILE
    done < $CONFIG_FILE
    mv $NEW_CONFIG_FILE $CONFIG_FILE
}

function add_sip_user {
    NEW_CONFIG_FILE="${CONFIG_FILE}.new"
    if [ -f $NEW_CONFIG_FILE ]; then
        rm -f $NEW_CONFIG_FILE
    fi
    touch $NEW_CONFIG_FILE
    IFS=''
    while read line; do
        if [[ "$line" == *'</provision>' ]]; then
            echo "<user id=\"$MY_USERNAME\">" >> $NEW_CONFIG_FILE
            echo "<extension>$EXTENSION</extension>" >> $NEW_CONFIG_FILE
            echo "<secret>$PASSWORD</secret>" >> $NEW_CONFIG_FILE
            echo "<display>$MY_USERNAME $EXTENSION</display>" >> $NEW_CONFIG_FILE
            echo '</user>' >> $NEW_CONFIG_FILE
        fi
        echo $line >> $NEW_CONFIG_FILE
    done < $CONFIG_FILE
    mv $NEW_CONFIG_FILE $CONFIG_FILE
    usermod -aG sipwitch $MY_USERNAME
}

while [[ $# > 1 ]]
do
key="$1"

case $key in
    -h|--help)
    show_help
    ;;
    -u|--user)
    shift
    MY_USERNAME="$1"
    ;;
    -e|--extension)
    shift
    EXTENSION="$1"
    ;;
    -p|--password)
    shift
    PASSWORD="$1"
    ;;
    *)
    # unknown option
    ;;
esac
shift
done

if ! [[ $MY_USERNAME && $EXTENSION && $PASSWORD ]]; 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
    update_sip_user
    echo $"SIP user $MY_USERNAME amended"
else
    add_sip_user
    echo $"SIP user $MY_USERNAME added"
fi

systemctl restart sipwitch

exit 0