feat: add `/_conduwuit/local_user_count` endpoint

only enabled if federation is enabled

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/client_server/unversioned.rs

@@ -155,7 +155,20 @@ pub(crate) async fn syncv3_client_server_json() -> Result<impl IntoResponse> {
 /// `/_matrix/federation/v1/version`
 pub(crate) async fn conduwuit_server_version() -> Result<impl IntoResponse> {
 	Ok(Json(serde_json::json!({
-		"name": "Conduwuit",
+		"name": "conduwuit",
 		"version": conduwuit_version(),
 	})))
 }
+
+/// # `GET /_conduwuit/local_user_count`
+///
+/// conduwuit-specific API to return the amount of users registered on this
+/// homeserver. Endpoint is disabled if federation is disabled for privacy. This
+/// only includes active users (not deactivated, no guests, etc)
+pub(crate) async fn conduwuit_local_user_count() -> Result<impl IntoResponse> {
+	let user_count = services().users.list_local_users()?.len();
+
+	Ok(Json(serde_json::json!({
+		"count": user_count
+	})))
+}

src/api/router.rs

@@ -220,11 +220,13 @@ pub fn build(router: Router, server: &Server) -> Router {
 			.ruma_route(server_server::claim_keys_route)
 			.ruma_route(server_server::get_hierarchy_route)
 			.ruma_route(server_server::well_known_server)
+			.route("/_conduwuit/local_user_count", get(client_server::conduwuit_local_user_count))
 	} else {
 		router
 			.route("/_matrix/federation/*path", any(federation_disabled))
 			.route("/.well-known/matrix/server", any(federation_disabled))
 			.route("/_matrix/key/*path", any(federation_disabled))
+			.route("/_conduwuit/local_user_count", any(federation_disabled))
 	}
 }