dotfiles/modules/nixos/services/caddy.nix

{ config, pkgs, lib, ... }: {

  options = {
    caddy.enable = lib.mkEnableOption "Caddy reverse proxy.";
    caddy.tlsPolicies = lib.mkOption {
      type = lib.types.listOf lib.types.attrs;
      description = "Caddy JSON TLS policies";
      default = [ ];
    };
    caddy.routes = lib.mkOption {
      type = lib.types.listOf lib.types.attrs;
      description = "Caddy JSON routes for http servers";
      default = [ ];
    };
    caddy.blocks = lib.mkOption {
      type = lib.types.listOf lib.types.attrs;
      description = "Caddy JSON error blocks for http servers";
      default = [ ];
    };
  };

  config = lib.mkIf (config.caddy.enable && config.caddy.routes != [ ]) {

    services.caddy = {
      enable = true;
      adapter = "''"; # Required to enable JSON
      configFile = pkgs.writeText "Caddyfile" (builtins.toJSON {
        apps.http.servers.main = {
          listen = [ ":443" ];
          routes = config.caddy.routes;
          errors.routes = config.caddy.blocks;
          # logs = { }; # Uncomment to collect access logs
        };
        apps.tls.automation.policies = config.caddy.tlsPolicies;
        logging.logs.main = {
          encoder = { format = "console"; };
          writer = {
            output = "file";
            filename = "${config.services.caddy.logDir}/caddy.log";
            roll = true;
          };
          level = "INFO";
        };
      });

    };

    networking.firewall.allowedTCPPorts = [ 80 443 ];
    networking.firewall.allowedUDPPorts = [ 443 ];

  };

}