dotfiles/modules/nixos/services/vaultwarden/default.nix

{
  config,
  flake,
  ...
}:
let
  inherit (flake.config.people) user0;
  inherit (flake.config.services) instances;
  serviceCfg = instances.vaultwarden;
  smtpCfg = instances.smtp;
  hostCfg = instances.web;
  dns0 = instances.web.dns.provider0;
  host = serviceCfg.domains.url0;
  dns0Path = "dns/${dns0}";
  hostSecrets = "/opt/secrets";
in
{

  microvm.vms.vaultwarden = {
    autostart = true;
    restartIfChanged = true;
    config = {
      system.stateVersion = "24.05";
      time.timeZone = "America/Winnipeg";
      users.users.root.openssh.authorizedKeys.keys = flake.config.people.users.${user0}.sshKeys;
      services = {
        vaultwarden = {
          enable = true;
          dbBackend = "sqlite";
          config = {
            # Domain Configuration
            DOMAIN = "https://${host}";

            # Email Configuration
            SMTP_AUTH_MECHANISM = "Plain";
            SMTP_EMBED_IMAGES = true;
            SMTP_FROM = serviceCfg.email.address0;
            SMTP_FROM_NAME = serviceCfg.label;
            SMTP_HOST = smtpCfg.hostname;
            SMTP_PORT = smtpCfg.ports.port1;
            SMTP_SECURITY = smtpCfg.records.record1;
            SMTP_USERNAME = smtpCfg.email.address0;

            # Security Configuration
            DISABLE_ADMIN_TOKEN = false;

            # Event and Backup Management
            EVENTS_DAYS_RETAIN = 90;

            # User Features
            SENDS_ALLOWED = true;
            SIGNUPS_VERIFY = true;
            WEB_VAULT_ENABLED = true;

            # Rocket (Web Server) Settings
            ROCKET_ADDRESS = "0.0.0.0";
            ROCKET_PORT = serviceCfg.ports.port0;
          };

          # Environment file with secrets (mounted from host)
          environmentFile = "/run/secrets/env";
        };
        openssh = {
          enable = true;
          settings = {
            PasswordAuthentication = false;
            PermitRootLogin = "prohibit-password";
          };
        };
      };

      networking.firewall.allowedTCPPorts = [
        22 # SSH
        25 # SMTP
        139 # SMTP
        587 # SMTP
        2525 # SMTP
        serviceCfg.ports.port0
      ];

      systemd = {
        network = {
          enable = true;
          networks."20-lan" = {
            matchConfig.Name = "enp0s5";
            addresses = [
              { Address = "${serviceCfg.interface.ip}/24"; }
            ];
            routes = [
              {
                Destination = "${hostCfg.localhost.address1}/0";
                Gateway = serviceCfg.interface.gate;
              }
            ];
            dns = [
              "1.1.1.1"
              "8.8.8.8"
            ];
          };
        };

        tmpfiles.rules = [
          "Z ${serviceCfg.varPaths.path0} 0755 ${serviceCfg.name} ${serviceCfg.name} -"
          "Z ${serviceCfg.secretPaths.path0} 0755 ${serviceCfg.name} ${serviceCfg.name} -"
        ];

      };

      systemd.services.systemd-networkd.wantedBy = [ "multi-user.target" ];

      microvm = {
        vcpu = 2;
        mem = 3072;
        hypervisor = "qemu";
        interfaces = [
          {
            type = "tap";
            id = serviceCfg.interface.id;
            mac = serviceCfg.interface.mac;
          }
          {
            type = "user";
            id = serviceCfg.interface.idUser;
            mac = serviceCfg.interface.macUser;
          }
        ];

        forwardPorts = [
          {
            from = "host";
            host.port = serviceCfg.interface.ssh;
            guest.port = 22;
          }
        ];

        shares = [
          {
            mountPoint = "/nix/.ro-store";
            proto = "virtiofs";
            source = "/nix/store";
            tag = "read_only_nix_store";
          }
          {
            mountPoint = "/var/lib/bitwarden_rs";
            proto = "virtiofs";
            source = serviceCfg.mntPaths.path0;
            tag = "vaultwarden_data";
          }
          {
            mountPoint = "/run/secrets";
            proto = "virtiofs";
            source = "${hostSecrets}/${serviceCfg.name}";
            tag = "host_secrets";
          }
        ];
      };
    };
  };

  security.acme.certs."${host}" = {
    dnsProvider = dns0;
    environmentFile = config.sops.secrets.${dns0Path}.path;
    group = "caddy";
  };

  services.caddy.virtualHosts = {
    "${host}" = {
      extraConfig = ''
        reverse_proxy ${serviceCfg.interface.ip}:${toString serviceCfg.ports.port0} {
          header_up X-Real-IP {remote_host}
        }

        tls ${serviceCfg.ssl.cert} ${serviceCfg.ssl.key}

        encode zstd gzip
      '';
    };
  };

  users.users.caddy.extraGroups = [ "acme" ];

  systemd.tmpfiles.rules = [
    "d ${serviceCfg.mntPaths.path0} 0751 microvm wheel - -"
  ];

  sops.secrets = {
    "${serviceCfg.name}/env" = {
      path = hostSecrets;
      owner = "root";
      mode = "0600";
    };
  };
}