nixos/hosts/common/optional/nixos-containers/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;
  container_name = "bitcoin-node";
  container_ip = "10.0.10.4";
  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" = {};
  };

  environment.persistence."/persist" = {
    hideMounts = true;
    directories = [
      "/var/lib/nixos-containers/${container_name}"
    ];
  };

  networking.nat.enable = true;
  networking.nat.internalInterfaces = ["ve-+"];
  networking.nat.externalInterface = "br0";

  containers.${container_name} = {
    autoStart = true;
    privateNetwork = true;
    hostBridge = "br0";
    nixpkgs = pkgs.path;
    bindMounts = {
      "/etc/nix-bitcoin-secrets/bitcoin-rpcpassword-privileged" = {
        hostPath = "${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/bitcoind" = {
        hostPath = "/media/main-ssd/nix-bitcoin/bitcoind";
        isReadOnly = false;
      };
      "/var/lib/electrs" = {
        hostPath = "/media/main-ssd/nix-bitcoin/electrs";
        isReadOnly = false;
      };
      "/var/lib/mysql" = {
        hostPath = "/media/main-ssd/nix-bitcoin/mysql";
        isReadOnly = false;
      };
      "/var/lib/tor" = {
        hostPath = "/media/main-ssd/nix-bitcoin/tor";
        isReadOnly = false;
      };
    };

    config = {
      pkgs,
      lib,
      ...
    }: {
      imports = [
        inputs.nix-bitcoin.nixosModules.default
      ];
      environment.systemPackages = with pkgs; [
        vim
        lsof
        jq
      ];
      networking = {
        defaultGateway = "10.0.10.1";
        interfaces.eth0.ipv4.addresses = [ { "address" = "${container_ip}"; "prefixLength" = 24; } ];
        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
            config.containers.bitcoin-node.config.services.electrs.port
          ];
        };
        useHostResolvConf = lib.mkForce false;
      };

      services.resolved.enable = true;

      # node services here
      nix-bitcoin.generateSecrets = true;
      services = {
        tor = {
          enable = true;
          client.enable = true;
        };
        bitcoind = {
          tor.proxy = true;
          tor.enforce = true;
          enable = true;
          dataDir = "/var/lib/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/electrs";
          address = "0.0.0.0";
        };
        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;
      };

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

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

      system.stateVersion = "24.05";
    };
  };
}