#!/bin/sh
set -eu

value=${1-}
policy_file=${BACKEND_URL_POLICY_FILE:-/etc/thothii/backend-url-policy.json}

if jq -e --arg value "$value" '.relativeBases | index($value) != null' \
    "$policy_file" >/dev/null; then
  exit 0
fi

if ! jq -e --arg value "$value" \
    '.absolutePattern as $pattern | $value | test($pattern)' \
    "$policy_file" >/dev/null; then
  exit 2
fi

authority=${value#*://}
authority=${authority%%/*}
port=""
case "$authority" in
  *]:*) port=${authority##*:} ;;
  *]) ;;
  *:*) port=${authority##*:} ;;
esac

if [ -n "$port" ]; then
  max_port=$(jq -r '.maxPort' "$policy_file")
  if [ "${#port}" -gt 5 ] || [ "$port" -gt "$max_port" ]; then exit 2; fi
fi