import { createHmac } from "node:crypto";
import { isIP } from "node:net";

export function getClientAddress(headers: Headers) {
  const forwardedAddress = headers
    .get("x-forwarded-for")
    ?.split(",", 1)[0]
    ?.trim();
  const address = forwardedAddress || headers.get("x-real-ip")?.trim();
  return address && isIP(address) ? address : null;
}

export function hashClientAddress(address: string, secret: string) {
  return createHmac("sha256", secret).update(address).digest("hex");
}