nixos/matrix-synapse: set public baseurl in example config

1 files changed, 7 insertions, 1 deletions

diff --git a/nixos/modules/services/matrix/synapse.md b/nixos/modules/services/matrix/synapse.md
index cad91ebf58d..1d22805b472 100644
--- a/nixos/modules/services/matrix/synapse.md
+++ b/nixos/modules/services/matrix/synapse.md
@@ -27,7 +27,8 @@ please refer to the
 { pkgs, lib, config, ... }:
 let
   fqdn = "${config.networking.hostName}.${config.networking.domain}";
-  clientConfig."m.homeserver".base_url = "https://${fqdn}";
+  baseUrl = "https://${fqdn}";
+  clientConfig."m.homeserver".base_url = baseUrl;
   serverConfig."m.server" = "${fqdn}:443";
   mkWellKnown = data: ''
     add_header Content-Type application/json;
@@ -97,6 +98,11 @@ in {
   services.matrix-synapse = {
     enable = true;
     settings.server_name = config.networking.domain;
+    # The public base URL value must match the `base_url` value set in `clientConfig` above.
+    # The default value here is based on `server_name`, so if your `server_name` is different
+    # from the value of `fqdn` above, you will likely run into some mismatched domain names
+    # in client applications.
+    settings.public_baseurl = baseUrl;
     settings.listeners = [
       { port = 8008;
         bind_addresses = [ "::1" ];