outline: Add module

modules/system/services/outline.nix

@@ -0,0 +1,64 @@
+{ config, lib, ... }:
+let
+  cfg = config.custom.services.outline;
+in
+{
+  options.custom.services.outline = {
+    enable = lib.mkEnableOption "";
+    domain = lib.mkOption {
+      type = lib.types.nonEmptyStr;
+      default = "";
+    };
+    port = lib.mkOption {
+      type = lib.types.port;
+      default = 32886;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    meta = {
+      domains.list = [ cfg.domain ];
+      ports.tcp.list = [ cfg.port ];
+    };
+
+    sops.secrets."outline/gitlab-auth-secret" = {
+      owner = config.users.users.outline.name;
+      restartUnits = [ "outline.service" ];
+    };
+
+    services.outline = {
+      enable = true;
+      publicUrl = "https://${cfg.domain}";
+      inherit (cfg) port;
+      forceHttps = false;
+      storage.storageType = "local";
+
+      # See https://docs.getoutline.com/s/hosting/doc/rate-limiter-HSqErsUgXH
+      rateLimiter = {
+        enable = true;
+        requests = 1000;
+      };
+
+      # See https://docs.getoutline.com/s/hosting/doc/gitlab-GjNVvyv7vW
+      oidcAuthentication =
+        let
+          baseURL = "https://code.fbi.h-da.de/oauth";
+        in
+        {
+          clientId = "0cb1f65501ea59bcafb3d7d7cb66235926635a3f52cf719a919c87984997002d";
+          clientSecretFile = config.sops.secrets."outline/gitlab-auth-secret".path;
+          authUrl = "${baseURL}/authorize";
+          tokenUrl = "${baseURL}/token";
+          userinfoUrl = "${baseURL}/userinfo";
+          usernameClaim = "username";
+          displayName = "GitLab";
+          scopes = [
+            "openid"
+            "email"
+          ];
+        };
+    };
+
+    systemd.services.outline.enableStrictShellChecks = false;
+  };
+}