infra/services/vault/default.nix

{ config, lib, ... }:
let
  cfg = config.bagel.services.vault;
  inherit (lib) mkEnableOption mkOption mkIf concatStringsSep types;
  mkPeerNode = fqdn: ''
    retry_join {
      leader_api_addr = "https://${fqdn}"
      leader_tls_servername = "${fqdn}"
    }
  '';
  wanAddress = if config.bagel.infra.self.wan.family == "inet6" then "[${config.bagel.infra.self.wan.address}]" else "${config.bagel.infra.self.wan.address}";
in
{
  options.bagel.services.vault = {
    enable = mkEnableOption "the OpenBao (Vault fork) service";
    domain = mkOption {
      type = types.str;
      default = config.networking.fqdn;
      defaultText = "config.networking.fqdn";
      example = "vault.infra.forkos.org";
    };
    peers = mkOption {
      type = types.listOf types.str;
      default = [ ];
      description = "List of FQDN that are peers of this service";
    };
  };

  imports = [
    ./module.nix
  ];

  config = mkIf cfg.enable {
    networking.firewall.allowedTCPPorts = [
      # NGINX HTTP API access
      80
      443
      # mTLS backed cluster port
      8201
    ];
    services.nginx = {
      enable = true;
      recommendedProxySettings = true;
      virtualHosts."${cfg.domain}" = {
        enableACME = true;
        forceSSL = true;

        locations."/" = {
          proxyPass = "http://127.0.0.1:8200";
        };
      };
    };

    services.openbao = {
      enable = true;
      storageBackend = "raft";
      listenerExtraConfig = ''
        cluster_address = "${wanAddress}:8201"
      '';
      storageConfig = ''
        node_id = "${config.networking.fqdn}"

        # Other nodes of the cluster.
        ${concatStringsSep "\n" (map mkPeerNode cfg.peers)}
      '';
      extraConfig = ''
        cluster_addr = "http://${config.networking.fqdn}:8201"
        api_addr = "https://${config.networking.fqdn}"
      '';
    };
  };
}