From 78bc60b8a4c0ffdd7f6161d51f12da231f05483c Mon Sep 17 00:00:00 2001
From: Raito Bezarius <masterancpp@gmail.com>
Date: Thu, 14 Dec 2023 20:22:33 +0100
Subject: [PATCH] nixos/hebbot: init

This is a NixOS module to support TWIM-style Matrix bots.
---
 .../manual/release-notes/rl-2405.section.md   |  2 +
 nixos/modules/module-list.nix                 |  1 +
 nixos/modules/services/matrix/hebbot.nix      | 78 +++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 nixos/modules/services/matrix/hebbot.nix

diff --git a/nixos/doc/manual/release-notes/rl-2405.section.md b/nixos/doc/manual/release-notes/rl-2405.section.md
index 6956c1ab6053..305b6ae51a2f 100644
--- a/nixos/doc/manual/release-notes/rl-2405.section.md
+++ b/nixos/doc/manual/release-notes/rl-2405.section.md
@@ -50,6 +50,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - [ollama](https://ollama.ai), server for running large language models locally.
 
+- [hebbot](https://github.com/haecker-felix/hebbot), a Matrix bot to generate "This Week in X" like blog posts. Available as [services.hebbot](#opt-services.hebbot.enable).
+
 - [Anki Sync Server](https://docs.ankiweb.net/sync-server.html), the official sync server built into recent versions of Anki. Available as [services.anki-sync-server](#opt-services.anki-sync-server.enable).
 The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been marked deprecated and will be dropped after 24.05 due to lack of maintenance of the anki-sync-server softwares.
 
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 2552ca6fa0f5..89c38f10b66b 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -633,6 +633,7 @@
   ./services/matrix/appservice-irc.nix
   ./services/matrix/conduit.nix
   ./services/matrix/dendrite.nix
+  ./services/matrix/hebbot.nix
   ./services/matrix/maubot.nix
   ./services/matrix/mautrix-facebook.nix
   ./services/matrix/mautrix-telegram.nix
diff --git a/nixos/modules/services/matrix/hebbot.nix b/nixos/modules/services/matrix/hebbot.nix
new file mode 100644
index 000000000000..ebf175464ddd
--- /dev/null
+++ b/nixos/modules/services/matrix/hebbot.nix
@@ -0,0 +1,78 @@
+{ lib
+, config
+, pkgs
+, ...
+}:
+
+let
+  inherit (lib) mkEnableOption mkOption mkIf types;
+  format = pkgs.formats.toml { };
+  cfg = config.services.hebbot;
+  settingsFile = format.generate "config.toml" cfg.settings;
+  mkTemplateOption = templateName: mkOption {
+    type = types.path;
+    description = lib.mdDoc ''
+      A path to the Markdown file for the ${templateName}.
+    '';
+  };
+in
+  {
+    meta.maintainers = [ lib.maintainers.raitobezarius ];
+    options.services.hebbot = {
+      enable = mkEnableOption "hebbot";
+      botPasswordFile = mkOption {
+        type = types.path;
+        description = lib.mdDoc ''
+          A path to the password file for your bot.
+
+          Consider using a path that does not end up in your Nix store
+          as it would be world readable.
+        '';
+      };
+      templates = {
+        project = mkTemplateOption "project template";
+        report = mkTemplateOption "report template";
+        section = mkTemplateOption "section template";
+      };
+      settings = mkOption {
+        type = format.type;
+        default = { };
+        description = lib.mdDoc ''
+          Configuration for Hebbot, see, for examples:
+
+          - <https://github.com/matrix-org/twim-config/blob/master/config.toml>
+          - <https://gitlab.gnome.org/Teams/Websites/thisweek.gnome.org/-/blob/main/hebbot/config.toml>
+        '';
+      };
+    };
+
+    config = mkIf cfg.enable {
+      systemd.services.hebbot = {
+        description = "hebbot - a TWIM-style Matrix bot written in Rust";
+        after = [ "network.target" ];
+        wantedBy = [ "multi-user.target" ];
+
+        preStart = ''
+          ln -sf ${cfg.templates.project} ./project_template.md
+          ln -sf ${cfg.templates.report} ./report_template.md
+          ln -sf ${cfg.templates.section} ./section_template.md
+          ln -sf ${settingsFile} ./config.toml
+        '';
+
+        script = ''
+          export BOT_PASSWORD="$(cat $CREDENTIALS_DIRECTORY/bot-password-file)"
+          ${lib.getExe pkgs.hebbot}
+        '';
+
+        serviceConfig = {
+          DynamicUser = true;
+          Restart = "on-failure";
+          LoadCredential = "bot-password-file:${cfg.botPasswordFile}";
+          RestartSec = "10s";
+          StateDirectory = "hebbot";
+          WorkingDirectory = "hebbot";
+      };
+    };
+  };
+}
+