From 2402ec0761117dc0e1b3727368fd6834136a5367 Mon Sep 17 00:00:00 2001
From: Chris Kruining <c.kruining@4dotnet.nl>
Date: Tue, 4 Nov 2025 09:46:19 +0100
Subject: [PATCH] fix(synapse): add user mapping to fix login via sso

---
 modules/nixos/services/communication/matrix/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/modules/nixos/services/communication/matrix/default.nix b/modules/nixos/services/communication/matrix/default.nix
index f84c002..c9dd26a 100644
--- a/modules/nixos/services/communication/matrix/default.nix
+++ b/modules/nixos/services/communication/matrix/default.nix
@@ -186,6 +186,11 @@ in
                   - profile
                 client_id: '${config.sops.placeholder."synapse/oidc_id"}'
                 client_secret: '${config.sops.placeholder."synapse/oidc_secret"}'
+                backchannel_logout_enabled: true
+                user_mapping_provider:
+                  config:
+                    localpart_template: "{{ user.preferred_username }}"
+                    display_name_template: "{{ user.name }}"
           '';
           restartUnits = [ "matrix-synapse.service" ];
         };