'Who's In?' Local Scanner

local_scanner.sh

#!/bin/bash

APP_PASSWORD="bar"
WHOSIN_URL=$1
AUTH_KEY=$2


local_scan() {
  macs=( $(sudo nmap -sn 192.168.1.0/24 | grep -Eio "([0-9A-F]{2}:){5}[0-9A-F]{2}") )
}

update_offline_since() {
  local json=()
  local DATE=$(date)

  for i in "${!macs[@]}"; do
    json[$i]="{\"mac\": \"${macs[$i]}\"}"
  done

  json=$( IFS=, ; echo "${json[*]}")
  json="[$json]"


  curl -X POST -d "$json" $WHOSIN_URL -u admin:$AUTH_KEY >/dev/null 2>&1

}

local_scan

if [ ${#macs[@]} -eq 0 ]; then
  echo "{'error': 'Nobody here'}"
else
  update_offline_since
fi