From 6160cc045ed3dd35c0805792950c410ca749e66f Mon Sep 17 00:00:00 2001
From: Carl Schwan <carl@carlschwan.eu>
Date: Fri, 2 Oct 2026 15:19:53 +0200
Subject: [PATCH] perf: Cache public share

Avoid doing repeatibly the same SQL query

Signed-off-by: Carl Schwan <carl@carlschwan.eu>
---
 lib/CurrentUser.php                 | 12 ++++++++++
 tests/benchmark/profile-prepend.php | 34 +++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 tests/benchmark/profile-prepend.php

diff --git a/lib/CurrentUser.php b/lib/CurrentUser.php
index 31d79bb33..d3a19ad1c 100644
--- a/lib/CurrentUser.php
+++ b/lib/CurrentUser.php
@@ -18,6 +18,9 @@
 
 class CurrentUser {
 
+	private bool $publicShareLoaded = false;
+	private ?IShare $publicShare = null;
+
 	public function __construct(
 		protected readonly IUserSession $userSession,
 		protected readonly IRequest $request,
@@ -107,6 +110,15 @@ protected function getCloudIDFromToken(): ?string {
 	}
 
 	protected function getPublicShare(): ?IShare {
+		if (!$this->publicShareLoaded) {
+			$this->publicShare = $this->loadPublicShare();
+			$this->publicShareLoaded = true;
+		}
+
+		return $this->publicShare;
+	}
+
+	private function loadPublicShare(): ?IShare {
 		if (basename($this->request->getScriptName()) !== 'public.php') {
 			return null;
 		}
diff --git a/tests/benchmark/profile-prepend.php b/tests/benchmark/profile-prepend.php
new file mode 100644
index 000000000..f7b71cb53
--- /dev/null
+++ b/tests/benchmark/profile-prepend.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * Loaded through auto_prepend_file: samples requests that carry an
+ * X-Bench-Profile header and writes the stacks in collapsed format,
+ * and clears the web server's APCu for requests with X-Bench-Clear-Cache.
+ */
+
+if (isset($_SERVER['HTTP_X_BENCH_CLEAR_CACHE']) && function_exists('apcu_clear_cache')) {
+	apcu_clear_cache();
+}
+
+if (isset($_SERVER['HTTP_X_BENCH_PROFILE']) && class_exists(ExcimerProfiler::class)) {
+	$benchProfiler = new ExcimerProfiler();
+	$benchProfiler->setPeriod(0.001);
+	$benchProfiler->setEventType(EXCIMER_REAL);
+	$benchProfiler->setMaxDepth(250);
+	$benchProfiler->start();
+
+	register_shutdown_function(static function () use ($benchProfiler): void {
+		$benchProfiler->stop();
+		$label = preg_replace('/[^A-Za-z0-9_.-]/', '', (string)$_SERVER['HTTP_X_BENCH_PROFILE']);
+		$dir = '/tmp/bench-profiles/' . $label;
+		if (!is_dir($dir)) {
+			@mkdir($dir, 0777, true);
+		}
+		file_put_contents($dir . '/' . uniqid('', true) . '.collapsed', $benchProfiler->getLog()->formatCollapsed());
+	});
+}