From 5ee23ef2e27eb521f43beb9208aea9ec29dca423 Mon Sep 17 00:00:00 2001
From: Finn Landweber <finn@landweber.xyz>
Date: Sat, 12 Oct 2024 22:45:34 +0200
Subject: [PATCH] bicep/matrix/hookshot: Backported from nixpkgs

Co-authored-by: Joakim Pettersvold <joakimpokemeg@hotmail.no>
---
 hosts/bicep/services/hookshot/module.nix | 127 +++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 hosts/bicep/services/hookshot/module.nix

diff --git a/hosts/bicep/services/hookshot/module.nix b/hosts/bicep/services/hookshot/module.nix
new file mode 100644
index 00000000..d6329e91
--- /dev/null
+++ b/hosts/bicep/services/hookshot/module.nix
@@ -0,0 +1,127 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  cfg = config.services.matrix-hookshot;
+  settingsFormat = pkgs.formats.yaml { };
+  configFile = settingsFormat.generate "matrix-hookshot-config.yml" cfg.settings;
+in
+{
+  options = {
+    services.matrix-hookshot = {
+      enable = lib.mkEnableOption "matrix-hookshot, a bridge between Matrix and project management services";
+
+      package = lib.mkPackageOption pkgs "matrix-hookshot" { };
+
+      registrationFile = lib.mkOption {
+        type = lib.types.path;
+        description = ''
+          Appservice registration file.
+          As it contains secret tokens, you may not want to add this to the publicly readable Nix store.
+        '';
+        example = lib.literalExpression ''
+          pkgs.writeText "matrix-hookshot-registration" \'\'
+            id: matrix-hookshot
+            as_token: aaaaaaaaaa
+            hs_token: aaaaaaaaaa
+            namespaces:
+              rooms: []
+              users:
+                - regex: "@_webhooks_.*:foobar"
+                  exclusive: true
+
+            sender_localpart: hookshot
+            url: "http://localhost:9993"
+            rate_limited: false
+            \'\'
+        '';
+      };
+
+      settings = lib.mkOption {
+        description = ''
+          {file}`config.yml` configuration as a Nix attribute set.
+
+          For details please see the [documentation](https://matrix-org.github.io/matrix-hookshot/latest/setup/sample-configuration.html).
+        '';
+        example = {
+          bridge = {
+            domain = "example.com";
+            url = "http://localhost:8008";
+            mediaUrl = "https://example.com";
+            port = 9993;
+            bindAddress = "127.0.0.1";
+          };
+          listeners = [
+            {
+              port = 9000;
+              bindAddress = "0.0.0.0";
+              resources = [ "webhooks" ];
+            }
+            {
+              port = 9001;
+              bindAddress = "localhost";
+              resources = [
+                "metrics"
+                "provisioning"
+              ];
+            }
+          ];
+        };
+        default = { };
+        type = lib.types.submodule {
+          freeformType = settingsFormat.type;
+          options = {
+            passFile = lib.mkOption {
+              type = lib.types.path;
+              default = "/var/lib/matrix-hookshot/passkey.pem";
+              description = ''
+                A passkey used to encrypt tokens stored inside the bridge.
+                File will be generated if not found.
+              '';
+            };
+          };
+        };
+      };
+
+      serviceDependencies = lib.mkOption {
+        type = with lib.types; listOf str;
+        default = lib.optional config.services.matrix-synapse.enable config.services.matrix-synapse.serviceUnit;
+        defaultText = lib.literalExpression ''
+          lib.optional config.services.matrix-synapse.enable config.services.matrix-synapse.serviceUnit
+        '';
+        description = ''
+          List of Systemd services to require and wait for when starting the application service,
+          such as the Matrix homeserver if it's running on the same host.
+        '';
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.matrix-hookshot = {
+      description = "a bridge between Matrix and multiple project management services";
+
+      wantedBy = [ "multi-user.target" ];
+      wants = [ "network-online.target" ] ++ cfg.serviceDependencies;
+      after = [ "network-online.target" ] ++ cfg.serviceDependencies;
+
+      preStart = ''
+        if [ ! -f '${cfg.settings.passFile}' ]; then
+          mkdir -p $(dirname '${cfg.settings.passFile}')
+          ${pkgs.openssl}/bin/openssl genpkey -out '${cfg.settings.passFile}' -outform PEM -algorithm RSA -pkeyopt rsa_keygen_bits:4096
+        fi
+      '';
+
+      serviceConfig = {
+        Type = "simple";
+        Restart = "always";
+        ExecStart = "${cfg.package}/bin/matrix-hookshot ${configFile} ${cfg.registrationFile}";
+      };
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ flandweber ];
+}