_gui_check_invoice_payed.sh

#!/bin/bash

function usage() {
  echo -e "This checks if a LND invoice has been payed using the rhash"
  echo -e ""
  echo -e "Usage: $0 [-h|--help] [-v*|--verbose] [-r|--rhash STRING]"
  echo -e ""
  echo -e "  -h, --help\t\tprint this help message"
  echo -e "  -v, --verbose\t\tbe more verbose"
  echo -e "  -r, --rhash STRING\tthe payment hash of the invoice (as HEX not BASE64!)"
  echo -e ""
}

function check_program() {
  command -v $1 >/dev/null 2>&1 || { echo >&2 "The program $1 is required but not installed.  Aborting."; exit 1; }
}

# Default Values
verbose=0
amt=0
memo=""

while [[ "$1" == -* ]]; do
  case "$1" in
    -h|--help)
      usage
      exit 0
      ;;
    -v*)
      (( verbose += ${#1} - 1 ))
      ;;
    --verbose)
      (( verbose++ ))
      ;;
    -r|--rhash)
      shift
      rhash="$1"
      ;;
    --)
      shift
      break
      ;;
    *)
    echo "Unrecognized option $1."
    echo ""
    usage
    exit 1
    ;;
  esac
  shift
done

if [[ -z "$rhash" ]]; then
  echo "Error: Argument not set: --rhash"
  exit 1
fi

if [[ "$rhash" =~ "=" ]]; then
  echo "Error: '${rhash}' contains a \"=\""
  exit 1
fi

if [[ "$rhash" =~ "+" ]]; then
  echo "Error: '${rhash}' contains a \"+\""
  exit 1
fi

if [[ "$rhash" =~ "/" ]]; then
  echo "Error: '${rhash}' contains a \"/\""
  exit 1
fi


# CONFIGFILE - configuration of RaspiBlitz
configFile="/mnt/hdd/raspiblitz.conf"
configExists=$(ls ${configFile} 2>/dev/null | grep -c '.conf')
if [ ${configExists} -eq 1 ]; then
  source ${configFile}
else
  echo "file not found: ${configFile}!"
  exit 1
fi

# make sure required programs are installed
check_program jq
check_program lncli

## SETUP DONE

ln_result=$(sudo -u bitcoin /usr/local/bin/lncli --chain=${network} --network=${chain}net lookupinvoice --rhash ${rhash} 2>/dev/null)
if [[ -z "$ln_result" ]]; then
  echo "Error: invoice not found"
  exit 1
fi

bool_result=$(echo "${ln_result}" | jq .settled)
echo ${bool_result}