Function isLoopbackAddress

src/node/utils/oauthLoopbackServer.ts:78–87

* Check whether an address string is a loopback address. * Node may normalize IPv4 loopback to an IPv6-mapped address. * * Extracted from codexOauthService.ts where validateLoopback is used.

(address: string | undefined)

 * Extracted from codexOauthService.ts where validateLoopback is used.
 */
function isLoopbackAddress(address: string | undefined): boolean {
  if (!address) return false;

  // Node may normalize IPv4 loopback to an IPv6-mapped address.
  if (address === "::ffff:127.0.0.1") {
    return true;
  }

  return address === "127.0.0.1" || address === "::1";
}

/**
 * Format a `server.listen()` host value for use inside a URL.