#!/bin/sh
export PREFIX="${PREFIX:-/usr/local}"
echo "urnstart: working on:" "$1" >&2
urn="$(printf '%s\n' "$1" | cut -d: -f1)"
if [ "$urn" != "urn" ];then
  echo "this isn't a urn. wtf are you waking me up for? I'm going back to bed. fuck this shit." >&2
  exit 1
fi

nid="$(printf '%s\n' "$1" | cut -d: -f2)"
nss="$(printf '%s\n' "$1" | cut -d: -f3)"
nss2="$(printf '%s\n' "$1" | cut -d: -f4-)"

if [ "$nid" = "anonet" ];then
  if [ "$nss" = "asn" ];then
    echo "whois://whois.ano/AS${nss2}"
  elif [ "$nss" = "ip4" -o "$nss" = "ip6" -o "$nss" = "dom" ];then
    echo "whois://whois.ano/${nss2}"
  fi
fi

if [ "$nid" = "ietf" ];then
  if [ "$nss" = "rfc" ];then
    echo gopher://thebackupbox.net:70/0/rfc/rfc${nss2}.txt
  fi
fi

if [ "$nid" = "xkcd" ];then
  echo "https://xkcd.com/${nss}"
fi

if [ "$nid" = "mitre" ];then
  if [ "$nss" = "cve" ];then
    echo "https://www.cvedetails.com/cve/CVE-${nss2}/"
  fi
fi

if [ "$nid" = "fcc" ];then
  if [ "$nss" = "frs" ];then
    grep "^$nss2\s" $PREFIX/share/urn/fcc:frs | cut -f2
  fi
fi