refactor: extract logic to hide mounts and share information

The permission string for directories and files can contain M or S
depending if they are respectively coming from a mount or a share. This
information is not to be disclosed when the share is a public one.

Signed-off-by: Salvatore Martire <[email protected]>

Author: salmart-dev

apps/dav/composer/composer/autoload_classmap.php

@@ -209,6 +209,7 @@
     'OCA\\DAV\\ConfigLexicon' => $baseDir . '/../lib/ConfigLexicon.php',
     'OCA\\DAV\\Connector\\LegacyDAVACL' => $baseDir . '/../lib/Connector/LegacyDAVACL.php',
     'OCA\\DAV\\Connector\\LegacyPublicAuth' => $baseDir . '/../lib/Connector/LegacyPublicAuth.php',
+    'OCA\\DAV\\Connector\\PermissionsTrait' => $baseDir . '/../lib/Connector/PermissionsTrait.php',
     'OCA\\DAV\\Connector\\Sabre\\AnonymousOptionsPlugin' => $baseDir . '/../lib/Connector/Sabre/AnonymousOptionsPlugin.php',
     'OCA\\DAV\\Connector\\Sabre\\AppleQuirksPlugin' => $baseDir . '/../lib/Connector/Sabre/AppleQuirksPlugin.php',
     'OCA\\DAV\\Connector\\Sabre\\Auth' => $baseDir . '/../lib/Connector/Sabre/Auth.php',

apps/dav/composer/composer/autoload_static.php

@@ -224,6 +224,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\ConfigLexicon' => __DIR__ . '/..' . '/../lib/ConfigLexicon.php',
         'OCA\\DAV\\Connector\\LegacyDAVACL' => __DIR__ . '/..' . '/../lib/Connector/LegacyDAVACL.php',
         'OCA\\DAV\\Connector\\LegacyPublicAuth' => __DIR__ . '/..' . '/../lib/Connector/LegacyPublicAuth.php',
+        'OCA\\DAV\\Connector\\PermissionsTrait' => __DIR__ . '/..' . '/../lib/Connector/PermissionsTrait.php',
         'OCA\\DAV\\Connector\\Sabre\\AnonymousOptionsPlugin' => __DIR__ . '/..' . '/../lib/Connector/Sabre/AnonymousOptionsPlugin.php',
         'OCA\\DAV\\Connector\\Sabre\\AppleQuirksPlugin' => __DIR__ . '/..' . '/../lib/Connector/Sabre/AppleQuirksPlugin.php',
         'OCA\\DAV\\Connector\\Sabre\\Auth' => __DIR__ . '/..' . '/../lib/Connector/Sabre/Auth.php',

apps/dav/lib/Connector/PermissionsTrait.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\DAV\Connector;
+
+trait PermissionsTrait {
+	/**
+	 * Removes mount information from the permission string if isPublic is true.
+	 */
+	private function getPermissionString(bool $isPublic, string $permissions):
+	string {
+		return $isPublic ? str_replace(['S', 'M'], '', $permissions) : $permissions;
+	}
+}

apps/dav/lib/Connector/Sabre/FilesPlugin.php

@@ -10,6 +10,7 @@
 use OC\AppFramework\Http\Request;
 use OC\FilesMetadata\Model\FilesMetadata;
 use OC\User\NoUserException;
+use OCA\DAV\Connector\PermissionsTrait;
 use OCA\DAV\Connector\Sabre\Exception\InvalidPath;
 use OCA\Files_Sharing\External\Mount as SharingExternalMount;
 use OCP\Accounts\IAccountManager;
@@ -40,6 +41,9 @@
 use Sabre\HTTP\ResponseInterface;
 
 class FilesPlugin extends ServerPlugin {
+
+	use PermissionsTrait;
+
 	// namespace
 	public const NS_OWNCLOUD = 'http://owncloud.org/ns';
 	public const NS_NEXTCLOUD = 'http://nextcloud.org/ns';
@@ -314,12 +318,8 @@ public function handleGetProperties(PropFind $propFind, \Sabre\DAV\INode $node)
 			});
 
 			$propFind->handle(self::PERMISSIONS_PROPERTYNAME, function () use ($node) {
-				$perms = $node->getDavPermissions();
-				if ($this->isPublic) {
-					// remove mount information
-					$perms = str_replace(['S', 'M'], '', $perms);
-				}
-				return $perms;
+				return $this->getPermissionString($this->isPublic,
+					$node->getDavPermissions());
 			});
 
 			$propFind->handle(self::SHARE_PERMISSIONS_PROPERTYNAME, function () use ($node, $httpRequest) {