#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Creates an inventory of remote backup locations
#
# License
# =======
#
# Copyright (C) 2015-2016 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/>.

NO_OF_ARGS=$#

PROJECT_NAME='freedombone'

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

CONFIG_FILE=$HOME/${PROJECT_NAME}.cfg

# User to create the list for
MY_USERNAME=$USER

# Filename of the remote backups list
FRIENDS_SERVERS_LIST=

# Minimum password length in characters
MINIMUM_PASSWORD_LENGTH=$(cat /usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-passwords | grep 'MINIMUM_PASSWORD_LENGTH=' | head -n 1 | awk -F '=' '{print $2}')

# How many remote locations were specified
entering_remote_backups_ctr=0

# Title shown
TITLE='Remote Backup'

# Whether to include the capability of adding reciprocal user accounts
# such that whoever is running a remote server can also use your server to
# store backups
RECIPROCAL="no"

function show_help {
    echo ''
    echo $"${PROJECT_NAME}-remote -u [username] -l [backup list filename] -m [min password length]"
    echo ''
    echo $'Creates an inventory of remote backup locations'
    echo ''
    echo ''
    echo $'  -h --help             Show help'
    echo $'  -u --username         User to create the backups.list file for'
    echo $'  -l --list             Remote backup list (usually /home/$USER/backup.list)'
    echo $'  -m --min              Minimum password length (characters)'
    echo $'  -r --reciprocal       Whether to add reciprocal user accounts'
    echo $'  -t --title            Title shown'
    echo ''
    exit 0
}

# Get the commandline options
while [[ $# > 1 ]]
do
    key="$1"

    case $key in
        -h|--help)
            show_help
            ;;
        # backup list filename
        # typically /home/$USER/backup.list
        -l|--list)
            shift
            FRIENDS_SERVERS_LIST="$1"
            ;;
        # username within /home
        -u|--user)
            shift
            MY_USERNAME="$1"
            ;;
        # Minimum password length
        -m|--min)
            shift
            MINIMUM_PASSWORD_LENGTH="$1"
            ;;
        # Title shown
        -t|--title)
            shift
            TITLE="$1"
            ;;
        # reciprocal user accounts
        -r|--reciprocal)
            shift
            RECIPROCAL="yes"
            ;;
        *)
            # unknown option
            ;;
    esac
    shift
done

function interactive_config_remote_backups {
    if [ ! $MY_USERNAME ]; then
        echo $'Please specify a username with the -u option'
        exit 7356
    fi

    if [ ! /home/$MY_USERNAME ]; then
        echo $"The user /home/$MY_USERNAME does not exist on the system"
        exit 3689
    fi

    if [ ! $FRIENDS_SERVERS_LIST ]; then
        FRIENDS_SERVERS_LIST=/home/$MY_USERNAME/backup.list
    fi

    # clear any existing list
    if [ -f $FRIENDS_SERVERS_LIST ]; then
        rm -f $FRIENDS_SERVERS_LIST
        touch $FRIENDS_SERVERS_LIST
    fi
    # number of entries made
    entering_remote_backups_ctr=1

    entering_remote_backups_done="no"
    remote_ssh_username=""
    remote_ssh_domain=""
    remote_ssh_port=""
    remote_ssh_password=""
    remote_ssh_reciprocal_username=""
    remote_ssh_reciprocal_password=""
    while [[ $entering_remote_backups_done == "no" ]]
    do
        data=$(tempfile 2>/dev/null)
        trap "rm -f $data" 0 1 2 5 15
        if [[ $RECIPROCAL == "yes" ]]; then
            dialog --backtitle "Freedombone Configuration" \
                   --title "$TITLE ${entering_remote_backups_ctr}" \
                   --form "\nPlease specify the SSH login details for the remote server\n\nThe reciprocal entries are optional, and can be used if you wish to set up a user account on this system for whoever runs the remote server to also use for backups" 20 50 8 \
                   "Username:" 1 1 "$remote_ssh_username" 1 23 16 15 \
                   "Domain:" 2 1 "$remote_ssh_domain" 2 23 16 15 \
                   "SSH port:" 3 1 "2222" 3 23 5 4 \
                   "Password:" 4 1 "$remote_ssh_password" 4 23 20 100 \
                   "Reciprocal Username:" 5 1 "$remote_ssh_reciprocal_username" 5 23 20 100 \
                   "Reciprocal Password:" 6 1 "$remote_ssh_reciprocal_password" 6 23 20 100 \
                   2> $data
        else
            dialog --backtitle "Freedombone Configuration" \
                   --title "$TITLE ${entering_remote_backups_ctr}" \
                   --form "\nPlease specify the SSH login details for the remote server" 15 50 4 \
                   "Username:" 1 1 "$remote_ssh_username" 1 23 16 15 \
                   "Domain:" 2 1 "$remote_ssh_domain" 2 23 16 15 \
                   "SSH port:" 3 1 "2222" 3 23 5 4 \
                   "Password:" 4 1 "$remote_ssh_password" 4 23 20 100 \
                   2> $data
        fi
        sel=$?
        case $sel in
            1) entering_remote_backups_done="yes";;
            255) entering_remote_backups_done="yes";;
        esac
        remote_ssh_username=$(cat $data | sed -n 1p)
        remote_ssh_domain=$(cat $data | sed -n 2p)
        remote_ssh_port=$(cat $data | sed -n 3p)
        remote_ssh_password=$(cat $data | sed -n 4p)
        remote_ssh_reciprocal_username=$(cat $data | sed -n 5p)
        remote_ssh_reciprocal_password=$(cat $data | sed -n 6p)
        if [[ $remote_ssh_username != "" && \
                    $remote_ssh_domain != "" && \
                    $remote_ssh_port != "" && \
                    $remote_ssh_password != "" ]]; then

            if [ ${#remote_ssh_password} -lt $MINIMUM_PASSWORD_LENGTH ]; then
                dialog --title "Password quality check" --msgbox "The password given was too short. It must be at least $MINIMUM_PASSWORD_LENGTH characters" 6 40
            else

                if [[ $RECIPROCAL == "yes" ]]; then
                    if [[ $remote_ssh_reciprocal_username != "" && \
                                $remote_ssh_reciprocal_password != "" ]]; then
                        if [ ${#remote_ssh_reciprocal_password} -lt $MINIMUM_PASSWORD_LENGTH ]; then
                            dialog --title "Password quality check" --msgbox "The reciprocal password given was too short. It must be at least $MINIMUM_PASSWORD_LENGTH characters" 6 40
                        else
                            echo ${remote_ssh_reciprocal_username}:${remote_ssh_reciprocal_password}::::/home/${remote_ssh_reciprocal_username}:bash | newusers
                            echo "$remote_ssh_username@$remote_ssh_domain $remote_ssh_port /home/$remote_ssh_username $remote_ssh_password" >> $FRIENDS_SERVERS_LIST
                            remote_ssh_username=""
                            remote_ssh_domain=""
                            remote_ssh_port=""
                            remote_ssh_password=""
                            remote_ssh_reciprocal_username=""
                            remote_ssh_reciprocal_password=""
                            entering_remote_backups_ctr=$((entering_remote_backups_ctr + 1))
                        fi
                    else
                        echo "$remote_ssh_username@$remote_ssh_domain $remote_ssh_port /home/$remote_ssh_username $remote_ssh_password" >> $FRIENDS_SERVERS_LIST
                        remote_ssh_username=""
                        remote_ssh_domain=""
                        remote_ssh_port=""
                        remote_ssh_password=""
                        remote_ssh_reciprocal_username=""
                        remote_ssh_reciprocal_password=""
                        entering_remote_backups_ctr=$((entering_remote_backups_ctr + 1))
                    fi
                else
                    echo "$remote_ssh_username@$remote_ssh_domain $remote_ssh_port /home/$remote_ssh_username $remote_ssh_password" >> $FRIENDS_SERVERS_LIST
                    remote_ssh_username=""
                    remote_ssh_domain=""
                    remote_ssh_port=""
                    remote_ssh_password=""
                    entering_remote_backups_ctr=$((entering_remote_backups_ctr + 1))
                fi

            fi
        else
            entering_remote_backups_done="yes"
        fi
    done
    if [ -f $FRIENDS_SERVERS_LIST ]; then
        chown $MY_USERNAME:$MY_USERNAME $FRIENDS_SERVERS_LIST
    fi
}

function show_result {
    clear
    if (( $entering_remote_backups_ctr < 2 )); then
        echo $'No remote backup locations were specified'
        exit 0
    fi
    if [ ! -f $FRIENDS_SERVERS_LIST ]; then
        echo $"No remote backups list found: $FRIENDS_SERVERS_LIST"
        exit 7358
    fi
    echo ''
    echo $"Remote backups list: $FRIENDS_SERVERS_LIST"
    echo ''
    echo $'Contents:'
    echo ''
    cat $FRIENDS_SERVERS_LIST
    echo ''
}

if [ ! $FRIENDS_SERVERS_LIST ]; then
    FRIENDS_SERVERS_LIST=/home/$MY_USERNAME/backup.list
fi

interactive_config_remote_backups
show_result
exit 0
