#!/usr/bin/env bash
# Pi-hole: A black hole for Internet advertisements
# (c) 2015, 2016 by Jacob Salmela
# Network-wide ad blocking via your Raspberry Pi
# http://pi-hole.net
# Whitelists domains
#
# Pi-hole 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 2 of the License, or
# (at your option) any later version.


helpFunc() {
	cat << EOM
::: Immediately whitelists one or more domains in the hosts file
:::
::: Usage: pihole -w domain1 [domain2 ...]
:::
::: Options:
:::  -d, --delmode			Remove domains from the whitelist
:::  -nr, --noreload			Update Whitelist without refreshing dnsmasq
:::  -q, --quiet			output is less verbose
:::  -h, --help				Show this help dialog
:::  -l, --list				Display your whitelisted domains
EOM
	exit 1
}

if [[ $# = 0 ]]; then
	helpFunc
fi

#globals
basename=pihole
piholeDir=/etc/${basename}
adList=${piholeDir}/gravity.list
whitelist=${piholeDir}/whitelist.txt
reload=true
addmode=true
verbose=true

domList=()
domToRemoveList=()

HandleOther(){
  #check validity of domain
	validDomain=$(echo "$1" | perl -ne'print if /\b((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,63}\b/')
	if [ -z "${validDomain}" ]; then
		echo "::: $1 is not a valid argument or domain name"
	else
		domList=("${domList[@]}" ${validDomain})
	fi
}

PopWhitelistFile() {
	#check whitelist file exists, and if not, create it
	if [[ ! -f ${whitelist} ]]; then
		touch ${whitelist}
	fi
	for dom in "${domList[@]}"; do
		if ${addmode}; then
			AddDomain "${dom}"
		else
			RemoveDomain "${dom}"
		fi
	done
}

AddDomain() {
	#| sed 's/\./\\./g'
	bool=false

	grep -Ex -q "$1" ${whitelist} || bool=true
	if ${bool}; then
	  #domain not found in the whitelist file, add it!
	  if ${verbose}; then
		echo -n "::: Adding $1 to $whitelist..."
	  fi
	  echo "$1" >> ${whitelist}
      if ${verbose}; then
	  	echo " done!"
	  fi
	else
		if ${verbose}; then
			echo "::: ${1} already exists in ${whitelist}, no need to add!"
		fi
	fi
}

RemoveDomain() {

  bool=false
  grep -Ex -q "$1" ${whitelist} || bool=true
  if ${bool}; then
  	#Domain is not in the whitelist file, no need to Remove
  	if ${verbose}; then
  	echo "::: $1 is NOT whitelisted! No need to remove"
  	fi
  else
    echo "$1" | sed 's/\./\\./g' | xargs -I {} perl -i -ne'print unless /'{}'(?!.)/;' ${whitelist}
  fi
}

Reload() {
	# Reload hosts file
	pihole -g -sd
}

DisplayWlist() {
	verbose=false
	echo -e " Displaying Gravity Resistant Domains \n"
	count=1
	while IFS= read -r RD; do
		echo "${count}: ${RD}"
		count=$((count+1))
	done < "${whitelist}"
}

###################################################

for var in "$@"; do
	case "${var}" in
		"-nr"| "--noreload"  ) reload=false;;
		"-d" | "--delmode"   ) addmode=false;;
		"-f" | "--force"     ) force=true;;
		"-q" | "--quiet"     ) verbose=false;;
		"-h" | "--help"      ) helpFunc;;
		"-l" | "--list"      ) DisplayWlist;;
		*                    ) HandleOther "${var}";;
	esac
done

PopWhitelistFile

if ${reload}; then
	Reload
fi