Emit typed event when preview is requested

Signed-off-by: Julius Härtl <jus@bitgrid.net>

6 files changed, 81 insertions, 19 deletions

diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 779758eb9cc..3b5e63a56ff 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -494,6 +494,7 @@ return array(
     'OCP\\Notification\\INotifier' => $baseDir . '/lib/public/Notification/INotifier.php',
     'OCP\\OCS\\IDiscoveryService' => $baseDir . '/lib/public/OCS/IDiscoveryService.php',
     'OCP\\PreConditionNotMetException' => $baseDir . '/lib/public/PreConditionNotMetException.php',
+    'OCP\\Preview\\BeforePreviewFetchedEvent' => $baseDir . '/lib/public/Preview/BeforePreviewFetchedEvent.php',
     'OCP\\Preview\\IProvider' => $baseDir . '/lib/public/Preview/IProvider.php',
     'OCP\\Preview\\IProviderV2' => $baseDir . '/lib/public/Preview/IProviderV2.php',
     'OCP\\Preview\\IVersionedPreviewFile' => $baseDir . '/lib/public/Preview/IVersionedPreviewFile.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index b39fadb0321..67ea952103c 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -527,6 +527,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\Notification\\INotifier' => __DIR__ . '/../../..' . '/lib/public/Notification/INotifier.php',
         'OCP\\OCS\\IDiscoveryService' => __DIR__ . '/../../..' . '/lib/public/OCS/IDiscoveryService.php',
         'OCP\\PreConditionNotMetException' => __DIR__ . '/../../..' . '/lib/public/PreConditionNotMetException.php',
+        'OCP\\Preview\\BeforePreviewFetchedEvent' => __DIR__ . '/../../..' . '/lib/public/Preview/BeforePreviewFetchedEvent.php',
         'OCP\\Preview\\IProvider' => __DIR__ . '/../../..' . '/lib/public/Preview/IProvider.php',
         'OCP\\Preview\\IProviderV2' => __DIR__ . '/../../..' . '/lib/public/Preview/IProviderV2.php',
         'OCP\\Preview\\IVersionedPreviewFile' => __DIR__ . '/../../..' . '/lib/public/Preview/IVersionedPreviewFile.php',
diff --git a/lib/private/Preview/Generator.php b/lib/private/Preview/Generator.php
index ef44188da74..a49cc8e522e 100644
--- a/lib/private/Preview/Generator.php
+++ b/lib/private/Preview/Generator.php
@@ -29,6 +29,7 @@
  */
 namespace OC\Preview;
 
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\File;
 use OCP\Files\IAppData;
 use OCP\Files\InvalidPathException;
@@ -40,6 +41,7 @@ use OCP\IConfig;
 use OCP\IImage;
 use OCP\IPreview;
 use OCP\IStreamImage;
+use OCP\Preview\BeforePreviewFetchedEvent;
 use OCP\Preview\IProviderV2;
 use OCP\Preview\IVersionedPreviewFile;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
@@ -56,26 +58,23 @@ class Generator {
 	/** @var GeneratorHelper */
 	private $helper;
 	/** @var EventDispatcherInterface */
+	private $legacyEventDispatcher;
+	/** @var IEventDispatcher */
 	private $eventDispatcher;
 
-	/**
-	 * @param IConfig $config
-	 * @param IPreview $previewManager
-	 * @param IAppData $appData
-	 * @param GeneratorHelper $helper
-	 * @param EventDispatcherInterface $eventDispatcher
-	 */
 	public function __construct(
 		IConfig $config,
 		IPreview $previewManager,
 		IAppData $appData,
 		GeneratorHelper $helper,
-		EventDispatcherInterface $eventDispatcher
+		EventDispatcherInterface $legacyEventDispatcher,
+		IEventDispatcher $eventDispatcher
 	) {
 		$this->config = $config;
 		$this->previewManager = $previewManager;
 		$this->appData = $appData;
 		$this->helper = $helper;
+		$this->legacyEventDispatcher = $legacyEventDispatcher;
 		$this->eventDispatcher = $eventDispatcher;
 	}
 
@@ -102,10 +101,14 @@ class Generator {
 			'crop' => $crop,
 			'mode' => $mode,
 		];
-		$this->eventDispatcher->dispatch(
+
+		$this->legacyEventDispatcher->dispatch(
 			IPreview::EVENT,
 			new GenericEvent($file, $specification)
 		);
+		$this->eventDispatcher->dispatchTyped(new BeforePreviewFetchedEvent(
+			$file
+		));
 
 		// since we only ask for one preview, and the generate method return the last one it created, it returns the one we want
 		return $this->generatePreviews($file, [$specification], $mimeType);
diff --git a/lib/private/PreviewManager.php b/lib/private/PreviewManager.php
index a2d34892c68..0d08ef3eba5 100644
--- a/lib/private/PreviewManager.php
+++ b/lib/private/PreviewManager.php
@@ -34,6 +34,7 @@ use OC\AppFramework\Bootstrap\Coordinator;
 use OC\Preview\Generator;
 use OC\Preview\GeneratorHelper;
 use OCP\AppFramework\QueryException;
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\File;
 use OCP\Files\IAppData;
 use OCP\Files\IRootFolder;
@@ -51,7 +52,8 @@ class PreviewManager implements IPreview {
 	protected IConfig $config;
 	protected IRootFolder $rootFolder;
 	protected IAppData $appData;
-	protected EventDispatcherInterface $eventDispatcher;
+	protected IEventDispatcher $eventDispatcher;
+	protected EventDispatcherInterface $legacyEventDispatcher;
 	private ?Generator $generator = null;
 	private GeneratorHelper $helper;
 	protected bool $providerListDirty = false;
@@ -73,20 +75,22 @@ class PreviewManager implements IPreview {
 	private IBinaryFinder $binaryFinder;
 
 	public function __construct(
-		IConfig $config,
-		IRootFolder $rootFolder,
-		IAppData $appData,
-		EventDispatcherInterface $eventDispatcher,
-		GeneratorHelper $helper,
-		?string $userId,
-		Coordinator $bootstrapCoordinator,
-		IServerContainer $container,
-		IBinaryFinder $binaryFinder
+		IConfig                  $config,
+		IRootFolder              $rootFolder,
+		IAppData                 $appData,
+		IEventDispatcher 		 $eventDispatcher,
+		EventDispatcherInterface $legacyEventDispatcher,
+		GeneratorHelper          $helper,
+		?string                  $userId,
+		Coordinator              $bootstrapCoordinator,
+		IServerContainer         $container,
+		IBinaryFinder            $binaryFinder
 	) {
 		$this->config = $config;
 		$this->rootFolder = $rootFolder;
 		$this->appData = $appData;
 		$this->eventDispatcher = $eventDispatcher;
+		$this->legacyEventDispatcher = $legacyEventDispatcher;
 		$this->helper = $helper;
 		$this->userId = $userId;
 		$this->bootstrapCoordinator = $bootstrapCoordinator;
@@ -153,6 +157,7 @@ class PreviewManager implements IPreview {
 					$this->rootFolder,
 					$this->config
 				),
+				$this->legacyEventDispatcher,
 				$this->eventDispatcher
 			);
 		}
diff --git a/lib/private/Server.php b/lib/private/Server.php
index 4f2a93677c5..3099dd2b7b8 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -334,6 +334,7 @@ class Server extends ServerContainer implements IServerContainer {
 					$c->get(IRootFolder::class),
 					$c->get(SystemConfig::class)
 				),
+				$c->get(IEventDispatcher::class),
 				$c->get(SymfonyAdapter::class),
 				$c->get(GeneratorHelper::class),
 				$c->get(ISession::class)->get('user_id'),
diff --git a/lib/public/Preview/BeforePreviewFetchedEvent.php b/lib/public/Preview/BeforePreviewFetchedEvent.php
new file mode 100644
index 00000000000..37da63b95a1
--- /dev/null
+++ b/lib/public/Preview/BeforePreviewFetchedEvent.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2022 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @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 OCP\Preview;
+
+use OCP\Files\Node;
+
+/**
+ * @since 25.0.1
+ */
+class BeforePreviewFetchedEvent extends \OCP\EventDispatcher\Event {
+	private Node $node;
+
+	/**
+	 * @since 25.0.1
+	 */
+	public function __construct(Node $node) {
+		parent::__construct();
+		$this->node = $node;
+	}
+
+	/**
+	 * @since 25.0.1
+	 */
+	public function getNode(): Node {
+		return $this->node;
+	}
+}