nix-configs/modules/services/traefik.nix

{
  pkgs,
  lib,
  config,
  ...
}:
let
  inherit (lib)
    mapAttrsToList
    mkMerge
    splitString
    concatStringsSep
    mkIf
    mkOption
    mkEnableOption
    ;
  inherit (lib.types)
    str
    bool
    nullOr
    anything
    attrsOf
    submodule
    listOf
    ;
  cfg = config.xyno.services.traefik;
  simpleProxyOpts = mapAttrsToList (
    n: v:
    let
      router = v.routerName;
      service = v.serviceName;
      spl = splitString "." v.host;
      certDomain = if (builtins.length spl) > 2 then concatStringsSep "." (builtins.tail spl) else spl;
    in
    mkMerge [
      (mkIf v.robotProtection {
        routers."${router}-robotstxt" = {
          service = "robotstxt";
          rule = "Host(`${v.host}`) && Path(`/robots.txt`)";
          tls.certResolver = "letsencrypt";
          tls.domains = [
            {
              main = certDomain;
              sans = [ "*.${certDomain}" ];
            }
          ];
        };
        services.robotstxt = {
          loadBalancer.servers = [
            { url = "http://127.0.0.2:8080"; }
          ];
        };
      })
      {
        routers.${router} = {
          inherit service;
          inherit (v) middlewares;
          rule = if v.rule != null then v.rule else "Host(`${v.host}`)";
          tls.certResolver = "letsencrypt";
          tls.domains = [
            {
              main = certDomain;
              sans = [ "*.${certDomain}" ];
            }
          ];
        };
        services.${service} = {
          loadBalancer.servers = [
            { url = v.internal; }
          ];
          loadBalancer.serversTransport = mkIf (v.transport != null) v.transport;
        };
      }
    ]
  ) cfg.simpleProxy;
in
{
  options.xyno.services.traefik.enable = mkEnableOption "enables traefik";
  options.xyno.services.traefik.noBots = mkOption {
    type = bool;
    default = true;
  };
  options.xyno.services.traefik.simpleProxy = mkOption {
    example = {
      "example" = {
        host = "example.org";
        middlewares = [ "meow" ];
        internal = "http://127.0.0.1:8080";
      };
    };
    default = { };
    type = attrsOf (
      submodule (
        { config, name,... }:
        {
          options = {
            middlewares = mkOption {
              type = listOf str;
              default = [];

            };
            internal = mkOption {
              type = str;
              description = "where to proxy to";
            };
            host = mkOption {
              type = str;
              description = "used for the route and tls";
            };
            routerName = mkOption {
              type = str;
              default = "simpleproxy-${name}-router";
            };
            serviceName = mkOption {
              type = str;
              default = "simpleproxy-${name}-service";
            };
            robotProtection = mkOption {
              type = bool;
              default = true;
              description = "robots.txt and (soon) iocane";
            };
            rule = mkOption {
              type = str;
              default = "Host(`${config.host}`)";
              description = "overrides the Host(`\${host}`) rule with something custom if set";
            };
            transport = mkOption {
              type = nullOr anything;
              default = null;
            };

          };
        }
      )
    );

  };
  config = mkIf cfg.enable {
    services.nginx = {
      enable = mkIf cfg.noBots true;
      defaultListen = mkIf cfg.noBots [
        {
          addr = "127.0.0.2";
          port = 8080;
        }
      ];
      virtualHosts._.default = true;
      virtualHosts._.locations."/".root = pkgs.writeTextFile {
        name = "robots.txt";
        destination = "/robots.txt";
        text = ''
          User-agent: *
          Disallow: /
        '';
      };
    };
    services.traefik = {
      enable = true;
      environmentFiles = [
        config.sops.templates."traefik.env".path
      ];
      staticConfigOptions = {
        accessLog = {};
        metrics = mkIf config.xyno.services.monitoring.enable {
          otlp.http.endpoint = "http://localhost:8429/v1/metrics";
        };
        entryponits.web = {
          address = ":80";
          redirections.entryPoint = {
            to = "websecure";
            scheme = "https";
            permanent = true;
          };
        };
        entrypoints.websecure = {
          address = ":443";
          http.tls.certResolver = "letsencrypt";
          http3 = { };

        };
        log.level = "INFO";
        certificatesResolvers.letsencrypt.acme = {
          email = "ssl@xyno.systems";
          caServer = "https://acme-v02.api.letsencrypt.org/directory";
          dnsChallenge = {
            resolvers = [
              "8.8.8.8"
              "1.1.1.1"
            ];
            provider = "desec";
          };
        };
      };
      dynamicConfigOptions = {
        http = mkMerge simpleProxyOpts;
        # tls.options.default = {
        #   # mozilla modern
        #   minVersion = "VersionTLS13";
        #   curvePreferences = [
        #     "X25519"
        #     "CurveP256"
        #     "CurveP384"
        #   ];
        # };
        # tls.options.old = {
        #   # mozilla intermediate
        #   minVersion = "VersionTLS12";
        #   curvePreferences = [
        #     "X25519"
        #     "CurveP256"
        #     "CurveP384"
        #   ];
        #   cipherSuites = [
        #     "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256"
        #     "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"
        #     "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384"
        #     "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384"
        #     "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305"
        #     "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305"
        #   ];

        # };
      };
    };
    networking.firewall.allowedTCPPorts = [
      80
      443
    ];
    networking.firewall.allowedUDPPorts = [ 443 ];
    xyno.impermanence.directories = [ config.services.traefik.dataDir ];
    sops.secrets."desec_token" = {
    };
    sops.templates."traefik.env".content = ''
      DESEC_TOKEN=${config.sops.placeholder.desec_token}
      DESEC_PROPAGATION_TIMEOUT=1200
      LEGO_DISABLE_CNAME_SUPPORT=true
    '';
    sops.templates."traefik.env".reloadUnits = [ "traefik.service" ];
    # services.borgmatic.settings.traefikql_databases = [
    #   {
    #     name = "all"; # gets run as root anyways so can log in
    #   }
    # ];

  };
}