#!/usr/bin/env bash
# This script converts an IPv4 iplist to CIDR block notation and JSON array format, sorting and de-duplicating IPs

# Set Variables
filename="iplist"
DEBUGMODE="0"


# Cleanup list
function cleanup {
	sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 $filename | uniq > iplist2
	mv iplist2 $filename
	# echo "iplist cleanup completed."
}


# Convert the list to CIDR notation if needed
function CIDR {

	# Remove existing file
	if [ -f CIDR-"$filename" ]; then
		rm CIDR-"$filename"
	fi

	while read iplist
	do
		if [[ $DEBUGMODE = "1" ]]; then
			echo "IP: "$iplist
		fi

		# Test for CIDR notation
		if ! echo $iplist | egrep -q '^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$'; then
			echo $iplist/32 >> CIDR-"$filename"
		else echo $iplist >> CIDR-"$filename"
		fi
	done < "$filename"
}


# Convert the list to JSON array
function JSONizeiplist {

	# Use CIDR file if it exists
	if [ -f CIDR-"$filename" ]; then
		filename=CIDR-"$filename"
	fi

	echo "[">> iplistjson2

	while read iplist
	do
		if [[ $DEBUGMODE = "1" ]]; then
			echo "IP: "$iplist
		fi
		echo \"$iplist\",>> iplistjson2
	done < "$filename"

	cat iplistjson2 | sed '$ s/.$//' >> iplistjson3

	echo "]">> iplistjson3

	rm iplistjson2 && mv iplistjson3 JSON-"$filename"

	iplistjson=$(cat "$filename")
	filename=JSON-"$filename"

	if [[ $DEBUGMODE = "1" ]]; then
		echo $iplistjson
	fi
}

cleanup

CIDR

JSONizeiplist

echo Completed, converted file name: $filename