#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Creates an inventory of remote backup locations
#
# 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/>.

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=10
if [ -f /usr/local/bin/${PROJECT_NAME} ]; then
	MINIMUM_PASSWORD_LENGTH=$(cat /usr/local/bin/${PROJECT_NAME}-utils-passwords | grep 'MINIMUM_PASSWORD_LENGTH=' | head -n 1 | awk -F '=' '{print $2}')
else
	if [ -f /usr/bin/${PROJECT_NAME} ]; then
		MINIMUM_PASSWORD_LENGTH=$(cat /usr/bin/${PROJECT_NAME}-utils-passwords | grep 'MINIMUM_PASSWORD_LENGTH=' | head -n 1 | awk -F '=' '{print $2}')
	fi
fi

# 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_configuration_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_configuration_remote_backups
show_result
exit 0
