{ pkgs, drive_paths, lib, config, ... }: {
  environment.systemPackages = with pkgs; [ vaultwarden ];

  services.vaultwarden.enable = true;
  services.vaultwarden.dbBackend = "postgresql";

  sops.secrets = lib.pipe [ "ADMIN_TOKEN", "SMTP_PASSWORD", "YUBICO_SECRET_KEY", "HIBP_API_KEY" ] [
    (name: {
      inherit name; value = {
      mode = "0400";
      owner = config.users.users.root.name;
      group = config.users.users.nobody.group;
      sopsFile = ../secrets/vaultwarden.json;
      format = "json";
    };
    })
    builtins.listToAttrs
  ];
} // (
  let
    isDerived = base != null;
  in
  if isDerived
  # We cannot use mkIf as both sides are evaluated no matter the condition value
  # Given we use base as an attrset, mkIf will error if base is null in here
  then
    with lib;
    let
      cfg = services.vaultwarden;

      vaultwarden_config = {
        # Server Settings
        DOMAIN = "https://passwords.clicks.codes";
        ROCKET_ADDRESS = "127.0.0.1";
        ROCKET_PORT = 8452;


        # General Settings
        SIGNUPS_ALLOWED = false;
        INVITATIONS_ALLOWED = true;
        SIGNUPS_DOMAINS_WHITELIST = "clicks.codes,coded.codes,thecoded.prof,starrysky.fyi,hopescaramels.com,pinea.dev";

        # TODO: Set folder locations for storing data.
        RSA_KEY_FILENAME = "${drive_paths.root}/bitwarden/rsa_key";
        ICON_CACHE_FOLDER = "${drive_paths.root}/bitwarden/icon_cache";
        ATTACHMENTS_FOLDER = "${drive_paths.External4000HDD}/bitwarden/attachments";
        SENDS_FOLDER = "${drive_paths.External4000HDD}/bitwarden/sends";
        TMP_FOLDER = "${drive_paths.External4000HDD}/bitwarden/tmp";

        DISABLE_2FA_REMEMBER = true;

        # Admin Account
        ADMIN_TOKEN = "!!ADMIN_TOKEN!!";


        # Database Settings
        DATABASE_URL = "postgresql://vaultwarden:!!clicks_bitwarden_db_secret!!@127.0.0.1:${config.services.postgresql.port}/vaultwarden";


        # Mail Settings
        SMTP_HOST = "127.0.0.1";
        SMTP_FROM = "bitwarden@clicks.codes";
        SMTP_FROM_NAME = "Clicks Bitwarden";
        SMTP_SECURITY = "starttls";
        SMTP_PORT = 587;

        SMTP_USERNAME = "FILL_ME_IN";
        SMTP_PASSWORD = "!!SMTP_PASSWORD!!";

        REQUIRE_DEVICE_EMAIL = true;


        # YubiKey Settings
        YUBICO_CLIENT_ID = "89788";
        YUBICO_SECRET_KEY = "!!YUBICO_SECRET_KEY!!";


        # TODO: Buy a license
        # HIBP Settings
        # HIBP_API_KEY="!!HIBP_API_KEY!!";
      };

      nameToEnvVar = name:
        let
          parts = builtins.split "([A-Z0-9]+)" name;
          partsToEnvVar = parts: foldl'
            (key: x:
              let last = stringLength key - 1; in
              if isList x then key + optionalString (key != "" && substring last 1 key != "_") "_" + head x
              else if key != "" && elem (substring 0 1 x) lowerChars then # to handle e.g. [ "disable" [ "2FAR" ] "emember" ]
                substring 0 last key + optionalString (substring (last - 1) 1 key != "_") "_" + substring last 1 key + toUpper x
              else key + toUpper x) ""
            parts;
        in
        if builtins.match "[A-Z0-9_]+" name != null then name else partsToEnvVar parts;

      # Due to the different naming schemes allowed for config keys,
      # we can only check for values consistently after converting them to their corresponding environment variable name.
      configEnv =
        let
          configEnv = concatMapAttrs
            (name: value: optionalAttrs (value != null) {
              ${nameToEnvVar name} = if isBool value then boolToString value else toString value;
            })
            vaultwarden_config;
        in
        { DATA_FOLDER = "/var/lib/bitwarden_rs"; } // optionalAttrs (!(configEnv ? WEB_VAULT_ENABLED) || configEnv.WEB_VAULT_ENABLED == "true") {
          WEB_VAULT_FOLDER = "${cfg.webVaultPackage}/share/vaultwarden/vault";
        } // configEnv;

      configFile = pkgs.writeText "vaultwarden.env" (concatStrings (mapAttrsToList (name: value: "${name}=${value}\n") configEnv));
    in
    {
      scalpel.trafos."vaultwarden.env" = {
        source = toString configFile;
        matchers."ADMIN_TOKEN".secret =
          config.sops.secrets.ADMIN_TOKEN.path;
        matchers."SMTP_PASSWORD".secret =
          config.sops.secrets.SMTP_PASSWORD.path;
        matchers."YUBICO_SECRET_KEY".secret =
          config.sops.secrets.YUBICO_SECRET_KEY.path;
        matchers."HIBP_API_KEY".secret =
          config.sops.secrets.HIBP_API_KEY.path;
        matchers."clicks_bitwarden_db_secret".secret =
          config.sops.secrets.clicks_bitwarden_db_password.path;
        owner = config.users.users.vaultwarden.name;
        group = config.users.groups.vaultwarden.name;
        mode = "0400";
      };

      services.vaultwarden.environmentFile = config.scalpel.trafos."vaultwarden.env".destination;
    } else { }
)