apps/dav: add some OSX specific quirks.

Signed-off-by: Claus-Justus Heine <himself@claus-justus-heine.de>

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

@@ -0,0 +1,91 @@
+<?php
+/**
+ * @copyright Copyright (c) 2023 Claus-Justus Heine
+ *
+ * @author Claus-Justus Heine <himself@claus-justus-heine.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\DAV\Connector\Sabre;
+
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+class QuirksPlugin extends ServerPlugin {
+
+	private $isMacOSDavAgent = false;
+
+	private $macOSVersion;
+
+	private $macOSAgent;
+
+	private $macOSAgentVersion;
+
+	/**
+     * Sets up the plugin.
+     *
+     * This method is automatically called by the server class.
+     */
+    public function initialize(Server $server)
+    {
+		$server->on('beforeMethod:*', [$this, 'beforeMethod'], 0);
+		$server->on('report', [$this, 'report'], 0);
+	}
+
+	/**
+     * Triggered before any method is handled.
+     */
+    public function beforeMethod(RequestInterface $request, ResponseInterface $response)
+    {
+		$userAgent = $request->getRawServerValue('HTTP_USER_AGENT');
+
+		// OSX agent string: macOS/13.2.1 (22D68) dataaccessd/1.0
+		if (preg_match('|macOS/([0-9]+)\\.([0-9]+)\\.([0-9]+)\s+\((\w+)\)\s+([^/]+)/([0-9]+)(?:\\.([0-9]+))?(?:\\.([0-9]+))?$|i', $userAgent, $matches)) {
+			$this->isMacOSDavAgent = true;
+			$this->macOSVersion = [
+				'major' => $matches[1],
+				'minor' => $matches[2],
+				'patch' => $matches[3],
+			];
+			$this->macOSAgent = $matches[5];
+			$this->macOSAgentVersion = [
+				'major' => $matches[6],
+				'minor' => $matches[7] ?? null,
+				'patch' => $matches[8] ?? null,
+			];
+			// \OCP\Util::writeLog('dav', 'OSX AGENT', \OCP\Util::INFO);
+		}
+	}
+
+	/**
+     * This method handles HTTP REPORT requests.
+     *
+     * @param string $reportName
+     * @param mixed  $report
+     * @param mixed  $path
+     */
+    public function report($reportName, $report, $path)
+    {
+		if ($this->isMacOSDavAgent && $reportName == '{DAV:}principal-property-search') {
+			/** @var \Sabre\DAVACL\Xml\Request\PrincipalPropertySearchReport $report */
+			$report->applyToPrincipalCollectionSet = true;
+		}
+		return true;
+	}
+}

apps/dav/lib/Server.php

@@ -110,6 +110,8 @@ public function __construct(IRequest $request, string $baseUri) {
 		// Add maintenance plugin
 		$this->server->addPlugin(new \OCA\DAV\Connector\Sabre\MaintenancePlugin(\OC::$server->getConfig(), \OC::$server->getL10N('dav')));
 
+		$this->server->addPlugin(new \OCA\DAV\Connector\Sabre\QuirksPlugin());
+
 		// Backends
 		$authBackend = new Auth(
 			\OC::$server->getSession(),