From 18010665ca0caffb7b8f4abdde49034b2657307e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sandro=20J=C3=A4ckel?= <sandro.jaeckel@gmail.com>
Date: Sat, 15 Jul 2023 00:45:32 +0200
Subject: [PATCH] nixos/matrix-sliding-sync: init

Co-authored-by: Emily <55066419+emilylange@users.noreply.github.com>
---
 nixos/modules/module-list.nix                 |  1 +
 .../services/matrix/matrix-sliding-sync.nix   | 96 +++++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 nixos/modules/services/matrix/matrix-sliding-sync.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index a20fbd69a2c..e40f670d46e 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -598,6 +598,7 @@
   ./services/matrix/mjolnir.nix
   ./services/matrix/mx-puppet-discord.nix
   ./services/matrix/pantalaimon.nix
+  ./services/matrix/matrix-sliding-sync.nix
   ./services/matrix/synapse.nix
   ./services/misc/airsonic.nix
   ./services/misc/ananicy.nix
diff --git a/nixos/modules/services/matrix/matrix-sliding-sync.nix b/nixos/modules/services/matrix/matrix-sliding-sync.nix
new file mode 100644
index 00000000000..9bf4de3317c
--- /dev/null
+++ b/nixos/modules/services/matrix/matrix-sliding-sync.nix
@@ -0,0 +1,96 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.matrix-synapse.sliding-sync;
+in
+{
+  options.services.matrix-synapse.sliding-sync = {
+    enable = lib.mkEnableOption (lib.mdDoc "sliding sync");
+
+    package = lib.mkPackageOption pkgs "matrix-sliding-sync" { };
+
+    settings = lib.mkOption {
+      type = lib.types.submodule {
+        freeformType = with lib.types; attrsOf str;
+        options = {
+          SYNCV3_SERVER = lib.mkOption {
+            type = lib.types.str;
+            description = lib.mdDoc ''
+              The destination homeserver to talk to not including `/_matrix/` e.g `https://matrix.example.org`.
+            '';
+          };
+
+          SYNCV3_DB = lib.mkOption {
+            type = lib.types.str;
+            default = "postgresql:///matrix-sliding-sync?host=/run/postgresql";
+            description = lib.mdDoc ''
+              The postgres connection string.
+              Refer to <https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING>.
+            '';
+          };
+
+          SYNCV3_BINDADDR = lib.mkOption {
+            type = lib.types.str;
+            default = "127.0.0.1:8009";
+            example = "[::]:8008";
+            description = lib.mdDoc "The interface and port to listen on.";
+          };
+
+          SYNCV3_LOG_LEVEL = lib.mkOption {
+            type = lib.types.enum [ "trace" "debug" "info" "warn" "error" "fatal" ];
+            default = "info";
+            description = lib.mdDoc "The level of verbosity for messages logged.";
+          };
+        };
+      };
+      default = { };
+      description = ''
+        Freeform environment variables passed to the sliding sync proxy.
+        Refer to <https://github.com/matrix-org/sliding-sync#setup> for all supported values.
+      '';
+    };
+
+    createDatabase = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = lib.mdDoc ''
+        Whether to enable and configure `services.postgres` to ensure that the database user `matrix-sliding-sync`
+        and the database `matrix-sliding-sync` exist.
+      '';
+    };
+
+    environmentFile = lib.mkOption {
+      type = lib.types.str;
+      description = lib.mdDoc ''
+        Environment file as defined in {manpage}`systemd.exec(5)`.
+
+        This must contain the {env}`SYNCV3_SECRET` variable which should
+        be generated with {command}`openssl rand -hex 32`.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.postgresql = lib.optionalAttrs cfg.createDatabase {
+      enable = true;
+      ensureDatabases = [ "matrix-sliding-sync" ];
+      ensureUsers = [ rec {
+        name = "matrix-sliding-sync";
+        ensurePermissions."DATABASE \"${name}\"" = "ALL PRIVILEGES";
+      } ];
+    };
+
+    systemd.services.matrix-sliding-sync = {
+      after = lib.optional cfg.createDatabase "postgresql.service";
+      wantedBy = [ "multi-user.target" ];
+      environment = cfg.settings;
+      serviceConfig = {
+        DynamicUser = true;
+        EnvironmentFile = cfg.environmentFile;
+        ExecStart = lib.getExe cfg.package;
+        StateDirectory = "matrix-sliding-sync";
+        WorkingDirectory = "%S/matrix-sliding-sync";
+      };
+    };
+  };
+}