nixos/hosts/common/optional/nix-bitcoin.nix

{
  inputs,
  lib,
  config,
  pkgs,
  ...
}: let
  bitcoin-rpcpassword-privileged = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."software/bitcoind/bitcoin-rpcpassword-privileged".path;
  bitcoin-rpcpassword-public = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."software/bitcoind/bitcoin-rpcpassword-public".path;
  bitcoin-HMAC-privileged = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."software/bitcoind/bitcoin-HMAC-privileged".path;
  bitcoin-HMAC-public = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."software/bitcoind/bitcoin-HMAC-public".path;
  pubKeys = lib.filesystem.listFilesRecursive ../users/keys;
in {
  sops.secrets = {
    "software/bitcoind/bitcoin-rpcpassword-privileged" = {};
    "software/bitcoind/bitcoin-rpcpassword-public" = {};
    "software/bitcoind/bitcoin-HMAC-privileged" = {};
    "software/bitcoind/bitcoin-HMAC-public" = {};
  };

  networking.nat.enable = true;
  networking.nat.internalInterfaces = ["ve-+"];
  networking.nat.externalInterface = "eth0";
  networking.firewall.enable = true;
  networking.firewall.allowedTCPPorts = [80 443 22];
  networking.firewall.trustedInterfaces = ["ve-+" "ve-bitcoin-node"];

  containers.bitcoin-node = {
    autoStart = true;
    privateNetwork = true;
    hostAddress = "10.0.21.1";
    localAddress = "10.0.21.2";
    nixpkgs = pkgs.path;
    bindMounts = {
      "/etc/nix-bitcoin-secrets/bitcoin-rpcpassword-privileged" = {
        hostPath = "${bitcoin-rpcpassword-privileged}";
        isReadOnly = false;
      };
      "/etc/nix-bitcoin-secrets/bitcoin-rpcpassword-public" = {
        hostPath = "${bitcoin-rpcpassword-public}";
        isReadOnly = false;
      };
      "/etc/nix-bitcoin-secrets/bitcoin-HMAC-privileged" = {
        hostPath = "${bitcoin-HMAC-privileged}";
        isReadOnly = false;
      };
      "/etc/nix-bitcoin-secrets/bitcoin-HMAC-public" = {
        hostPath = "${bitcoin-HMAC-public}";
        isReadOnly = false;
      };
      "/var/lib/nix-bitcoin" = {
        hostPath = "/media/main-ssd/nix-bitcoin";
        isReadOnly = false;
      };
    };

    forwardPorts = [
      {
        containerPort = 80;
        hostPort = 8080;
        protocol = "tcp";
      }
    ];

    config = {
      pkgs,
      lib,
      ...
    }: {
      imports = [
        inputs.nix-bitcoin.nixosModules.default
      ];
      environment.systemPackages = with pkgs; [
        vim
        lsof
        jq
      ];
      networking = {
        firewall = {
          enable = true;
          allowedTCPPorts = [
            80
            443
            22
            config.containers.bitcoin-node.config.services.bitcoind.rpc.port
            config.containers.bitcoin-node.config.services.mempool.frontend.port
          ];
        };
        useHostResolvConf = lib.mkForce false;
      };

      services.resolved.enable = true;

      services.openssh = {
        enable = true;
        settings.PasswordAuthentication = false;
      };

      nix-bitcoin.generateSecrets = true;

      users.users.root = {
        openssh.authorizedKeys.keys = lib.lists.forEach pubKeys (key: builtins.readFile key);
      };

      # node services here
      services = {
        tor = {
          enable = true;
          client.enable = true;
        };
        bitcoind = {
          tor.proxy = true;
          tor.enforce = true;
          enable = true;
          dataDir = "/var/lib/nix-bitcoin/bitcoind";
          dbCache = 5000;
          txindex = true;
          rpc = {
            address = "0.0.0.0";
            threads = 6;
            allowip = ["10.0.0.0/8"];
            users = let
              name = "bitcoin";
            in {
              privileged.name = name;
              public.name = name;
            };
          };
          extraConfig = ''
            onlynet=onion
            bind=127.0.0.1
          '';
        };
        electrs = {
          tor.enforce = true;
          enable = true;
          dataDir = "/var/lib/nix-bitcoin/electrs";
        };
        mempool = {
          enable = true;
          electrumServer = "electrs";
          frontend = {
            port = 4080;
            address = "0.0.0.0";
          };
        };
      };
      nix-bitcoin.onionServices = {
        bitcoind.enable = true;
        electrs.enable = true;
        mempool-frontend.enable = true;
      };
      system.stateVersion = "24.05";
    };
  };
}