whois rdap domain lookup script

query.sh

#!/bin/bash
# This script requires jq
set -e

DNS_JSON="${DNS_JSON:-"$HOME"/Downloads/dns.json}"
DOMAIN="${1:?Pass domain name as first argument}"
TLD="${DOMAIN/#*.}"

die() { echo "$*" >&2; exit 1; }

[[ "$#" -eq 1 ]] || die 'Invalid number of arguments. Expected 1: the domain name'
[[ -n "$DOMAIN" ]] || die 'Domain name is empty'
[[ -n "$TLD" ]] || die 'Could not resolve TLD'
[[ "$TLD" != "$DOMAIN" ]] || die 'TLD and domain are the same. Are there no dots?'

echo "Looking up TLD $TLD for domain $DOMAIN"


# Download the dns.json bootstrap file if it doesn't exist
if [[ ! -f "$DNS_JSON" ]]; then
  echo 'Downloading DNS file'
  curl -sSk https://data.iana.org/rdap/dns.json -o "$DNS_JSON" \
    || die 'Failed to download dns.json'
fi

FOUND_API=false
FOUND_DOMAIN=false
while read -r -d '' api; do
  [[ -n "$api" ]] || continue
  FOUND_API=true

  if RESP="$(curl -sSk "${api}domain/${DOMAIN}")"; then
   if [[ -z "$RESP" ]]; then
     echo 'Empty API data' >&2
     continue
   fi
   FOUND_DOMAIN=true

   if IS_EXPIRED="$(echo "$RESP" | jq -cr '.events | map(select(.eventAction == "expiration"))
        | [(length > 0) , (map(select(.eventDate | fromdateiso8601 > now)) | length > 0)]')"
   then
     if [[ "$IS_EXPIRED" = '[true,true]' ]]; then
       printf '\nRegistered and valid: %s\n' "$DOMAIN"
       exit 0
     elif [[ "$IS_EXPIRED" = '[true,false]' ]]; then
       printf '\nExpired: %s\n' "$DOMAIN"
       exit 1
     else
       echo 'Missing expiration date' >&2
     fi
   else
     echo 'Failed to parse domain data' >&2
   fi
  fi
done < <(jq --raw-output0 '.services[] | select(.[0][] | select(. == "'"$TLD"'")) | .[1][]' "$DNS_JSON")

failed() { echo ''; echo "$*"; exit 1; }

if ! $FOUND_API ; then failed "Failed to find API for TLD '$TLD': $DOMAIN"; fi
if ! $FOUND_DOMAIN ; then failed "Failed to find domain: $DOMAIN"; fi

failed "Unknown reason, but the domain was not found: $DOMAIN"