nixos-config/home-manager/roles/block-server.nix

list: {
  pkgs,
  lib,
  ...
}: {
  systemd.user.services.blockserver = {
    Unit.Description = "Serve a blocklist";
    Service = let
      blocklist = pkgs.writeTextDir "blocklist" (lib.concatStringsSep "\r\n" list);
      startpage = pkgs.writeTextDir "index.html" (builtins.readFile ./startpage.html);
    in {
      ExecStart = "${pkgs.python3}/bin/python -m http.server 8842 -d ${
        pkgs.symlinkJoin {
          name = "blockserver-dir";
          paths = [blocklist startpage];
        }
      }";
      Restart = "always";
    };
    Install.WantedBy = ["default.target"];
  };
}