# Shared TSIG secret for a gateway's dedicated ACME key (function: machine
# name -> module). The acme_gw_<x> key lets that gateway — and only it — write
# _acme-challenge.<label> TXT records on ns1 to obtain its internal wildcard
# cert via DNS-01. ns1 scopes it with a matching acl on the cnx.network zone.
# Import on BOTH ns1 and the gateway machine, applied with the machine name:
#   (import ../../modules/dns/acme-gw-secret.nix "gw-cnx-1")
machine:
{ pkgs, ... }:
{
  clan.core.vars.generators."dns-acme-${machine}-secret" = {
    share = true;
    files."secret".secret = true;
    runtimeInputs = [ pkgs.openssl ];
    # 32 random bytes, base64 — a valid hmac-sha256 TSIG secret.
    script = ''openssl rand -base64 32 | tr -d '\n' > "$out"/secret'';
  };
}