perf: Cache public share

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;
 		}

tests/CurrentUserTest.php

@@ -205,6 +205,34 @@ public function testGetCloudIDFromToken(array $server, array $shareData, ?string
 		$this->assertSame($expected, self::invokePrivate($instance, 'getCloudIDFromToken'));
 	}
 
+	public static function dataPublicShareIsLoadedOnce(): array {
+		return [
+			[IShare::TYPE_LINK, true],
+			[new ShareNotFound(), false],
+		];
+	}
+
+	#[DataProvider('dataPublicShareIsLoadedOnce')]
+	public function testPublicShareIsLoadedOnce(int|ShareNotFound $result, bool $expected): void {
+		$this->request->server = ['PHP_AUTH_USER' => 'token'];
+		$method = $this->shareManager->expects($this->once())
+			->method('getShareByToken')
+			->with('token');
+		if ($result instanceof ShareNotFound) {
+			$method->willThrowException($result);
+		} else {
+			$share = $this->createMock(IShare::class);
+			$share->method('getShareType')
+				->willReturn($result);
+			$method->willReturn($share);
+		}
+
+		$instance = $this->getInstance();
+		$this->assertSame($expected, $instance->isPublicShareToken());
+		$this->assertSame($expected, $instance->isPublicShareToken());
+		$this->assertNull(self::invokePrivate($instance, 'getCloudIDFromToken'));
+	}
+
 	public function testGetCloudIdFromUser(): void {
 		$user = $this->createMock(IUser::class);
 		$user->method('getCloudId')->willReturn('user@cloud.example.com');

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());
+	});
+}