feat(files): Add capability for clients to check WCF statefeat/add-wcf-cap

This adds a non-initial-state capability for the
windows-compatibile-filemnames feature.
It is not required by the webui and it might have performance impacts
(always compares system config against windows presets), so it is not
included in every page load, but instead for querying from the clients.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

2 files changed, 40 insertions, 0 deletions

diff --git a/apps/files/lib/AdvancedCapabilities.php b/apps/files/lib/AdvancedCapabilities.php
new file mode 100644
index 00000000000..22f990f0cf8
--- /dev/null
+++ b/apps/files/lib/AdvancedCapabilities.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Files;
+
+use OCA\Files\Service\SettingsService;
+use OCP\Capabilities\ICapability;
+use OCP\Capabilities\IInitialStateExcludedCapability;
+
+/**
+ * Capabilities not needed for every request.
+ * This capabilities might be hard to compute or no used by the webui.
+ */
+class AdvancedCapabilities implements ICapability, IInitialStateExcludedCapability {
+
+	public function __construct(
+		protected SettingsService $service,
+	) {
+	}
+
+	/**
+	 * Return this classes capabilities
+	 *
+	 * @return array{files: array{'windows_compatible_filenames': bool}}
+	 */
+	public function getCapabilities(): array {
+		return [
+			'files' => [
+				'windows_compatible_filenames' => $this->service->hasFilesWindowsSupport(),
+			],
+		];
+	}
+}
diff --git a/apps/files/lib/AppInfo/Application.php b/apps/files/lib/AppInfo/Application.php
index 8d00912f7bb..4b3948d43b5 100644
--- a/apps/files/lib/AppInfo/Application.php
+++ b/apps/files/lib/AppInfo/Application.php
@@ -9,6 +9,7 @@ declare(strict_types=1);
 namespace OCA\Files\AppInfo;
 
 use Closure;
+use OCA\Files\AdvancedCapabilities;
 use OCA\Files\Capabilities;
 use OCA\Files\Collaboration\Resources\Listener;
 use OCA\Files\Collaboration\Resources\ResourceProvider;
@@ -107,6 +108,7 @@ class Application extends App implements IBootstrap {
 		 * Register capabilities
 		 */
 		$context->registerCapability(Capabilities::class);
+		$context->registerCapability(AdvancedCapabilities::class);
 		$context->registerCapability(DirectEditingCapabilities::class);
 
 		$context->registerDeclarativeSettings(DeclarativeAdminSettings::class);