fix: do not crash the event emitting parent process if on listener fails

lib/composer/composer/autoload_classmap.php

@@ -1554,6 +1554,7 @@
     'OC\\Encryption\\Manager' => $baseDir . '/lib/private/Encryption/Manager.php',
     'OC\\Encryption\\Update' => $baseDir . '/lib/private/Encryption/Update.php',
     'OC\\Encryption\\Util' => $baseDir . '/lib/private/Encryption/Util.php',
+    'OC\\EventDispatcher\\CoreDispatcher' => $baseDir . '/lib/private/EventDispatcher/CoreDispatcher.php',
     'OC\\EventDispatcher\\EventDispatcher' => $baseDir . '/lib/private/EventDispatcher/EventDispatcher.php',
     'OC\\EventDispatcher\\ServiceEventListener' => $baseDir . '/lib/private/EventDispatcher/ServiceEventListener.php',
     'OC\\EventSource' => $baseDir . '/lib/private/EventSource.php',

lib/composer/composer/autoload_static.php

@@ -1595,6 +1595,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Encryption\\Manager' => __DIR__ . '/../../..' . '/lib/private/Encryption/Manager.php',
         'OC\\Encryption\\Update' => __DIR__ . '/../../..' . '/lib/private/Encryption/Update.php',
         'OC\\Encryption\\Util' => __DIR__ . '/../../..' . '/lib/private/Encryption/Util.php',
+        'OC\\EventDispatcher\\CoreDispatcher' => __DIR__ . '/../../..' . '/lib/private/EventDispatcher/CoreDispatcher.php',
         'OC\\EventDispatcher\\EventDispatcher' => __DIR__ . '/../../..' . '/lib/private/EventDispatcher/EventDispatcher.php',
         'OC\\EventDispatcher\\ServiceEventListener' => __DIR__ . '/../../..' . '/lib/private/EventDispatcher/ServiceEventListener.php',
         'OC\\EventSource' => __DIR__ . '/../../..' . '/lib/private/EventSource.php',

lib/private/EventDispatcher/CoreDispatcher.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\EventDispatcher;
+
+use Psr\EventDispatcher\StoppableEventInterface;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+
+/**
+ * Symfony Event Dispatcher Override
+ */
+class CoreDispatcher extends EventDispatcher {
+
+	public function __construct(
+		private LoggerInterface $logger
+	) {
+		parent::__construct();
+	}
+
+	/**
+     * Triggers the listeners of an event.
+     *
+     * This method can be overridden to add functionality that is executed
+     * for each listener.
+     *
+     * @param callable[] $listeners The event listeners
+     * @param string     $eventName The name of the event to dispatch
+     * @param object     $event     The event object to pass to the event handlers/listeners
+     *
+     * @return void
+     */
+    protected function callListeners(iterable $listeners, string $eventName, object $event)
+    {
+        $stoppable = $event instanceof StoppableEventInterface;
+
+        foreach ($listeners as $listener) {
+            if ($stoppable && $event->isPropagationStopped()) {
+                break;
+            }
+			// execute the listener and catch any exceptions to prevent an error in a listener from breaking the emitting process
+			try {
+				$listener($event, $eventName, $this);
+			} catch (\Throwable $e) {
+				$this->logger->error('Error occurred while executing an event listener ' . get_class($event), ['exception' => $e]);
+			}
+        }
+    }
+
+}

lib/private/EventDispatcher/EventDispatcher.php

@@ -16,12 +16,11 @@
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\IServerContainer;
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher as SymfonyDispatcher;
 use function get_class;
 
 class EventDispatcher implements IEventDispatcher {
 	public function __construct(
-		private SymfonyDispatcher $dispatcher,
+		private CoreDispatcher $dispatcher,
 		private IServerContainer $container,
 		private LoggerInterface $logger,
 	) {
@@ -80,10 +79,10 @@ public function dispatchTyped(Event $event): void {
 	}
 
 	/**
-	 * @return SymfonyDispatcher
+	 * @return CoreDispatcher
 	 * @deprecated 20.0.0
 	 */
-	public function getSymfonyDispatcher(): SymfonyDispatcher {
+	public function getSymfonyDispatcher(): CoreDispatcher {
 		return $this->dispatcher;
 	}
 }