Dispatch event on preview request

Fixes: #73

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

4 files changed, 39 insertions, 6 deletions

diff --git a/lib/private/Preview/Generator.php b/lib/private/Preview/Generator.php
index 3d4e9bf3677..32a732d8580 100644
--- a/lib/private/Preview/Generator.php
+++ b/lib/private/Preview/Generator.php
@@ -32,6 +32,8 @@ use OCP\IConfig;
 use OCP\IImage;
 use OCP\IPreview;
 use OCP\Preview\IProvider;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\GenericEvent;
 
 class Generator {
 
@@ -43,23 +45,28 @@ class Generator {
 	private $appData;
 	/** @var GeneratorHelper */
 	private $helper;
+	/** @var EventDispatcherInterface */
+	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
+		GeneratorHelper $helper,
+		EventDispatcherInterface $eventDispatcher
 	) {
 		$this->config = $config;
 		$this->previewManager = $previewManager;
 		$this->appData = $appData;
 		$this->helper = $helper;
+		$this->eventDispatcher = $eventDispatcher;
 	}
 
 	/**
@@ -78,6 +85,16 @@ class Generator {
 	 * @throws NotFoundException
 	 */
 	public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
+		$this->eventDispatcher->dispatch(
+			IPreview::EVENT,
+			new GenericEvent($file,[
+				'width' => $width,
+				'height' => $height,
+				'crop' => $crop,
+				'mode' => $mode
+			])
+		);
+
 		if ($mimeType === null) {
 			$mimeType = $file->getMimeType();
 		}
diff --git a/lib/private/PreviewManager.php b/lib/private/PreviewManager.php
index a2ef9659b3b..799f94f2bef 100644
--- a/lib/private/PreviewManager.php
+++ b/lib/private/PreviewManager.php
@@ -35,6 +35,7 @@ use OCP\Files\SimpleFS\ISimpleFile;
 use OCP\IConfig;
 use OCP\IPreview;
 use OCP\Preview\IProvider;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 class PreviewManager implements IPreview {
 	/** @var IConfig */
@@ -46,6 +47,9 @@ class PreviewManager implements IPreview {
 	/** @var IAppData */
 	protected $appData;
 
+	/** @var EventDispatcherInterface */
+	protected $eventDispatcher;
+
 	/** @var Generator */
 	private $generator;
 
@@ -65,16 +69,21 @@ class PreviewManager implements IPreview {
 	protected $defaultProviders;
 
 	/**
-	 * Constructor
+	 * PreviewManager constructor.
 	 *
-	 * @param \OCP\IConfig $config
+	 * @param IConfig $config
+	 * @param IRootFolder $rootFolder
+	 * @param IAppData $appData
+	 * @param EventDispatcherInterface $eventDispatcher
 	 */
 	public function __construct(IConfig $config,
 								IRootFolder $rootFolder,
-								IAppData $appData) {
+								IAppData $appData,
+								EventDispatcherInterface $eventDispatcher) {
 		$this->config = $config;
 		$this->rootFolder = $rootFolder;
 		$this->appData = $appData;
+		$this->eventDispatcher = $eventDispatcher;
 	}
 
 	/**
@@ -165,7 +174,8 @@ class PreviewManager implements IPreview {
 				$this->appData,
 				new GeneratorHelper(
 					$this->rootFolder
-				)
+				),
+				$this->eventDispatcher
 			);
 		}
 
diff --git a/lib/private/Server.php b/lib/private/Server.php
index 79efeb18d17..995dc8ed4a4 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -121,7 +121,8 @@ class Server extends ServerContainer implements IServerContainer {
 			return new PreviewManager(
 				$c->getConfig(),
 				$c->getRootFolder(),
-				$c->getAppDataDir('preview')
+				$c->getAppDataDir('preview'),
+				$c->getEventDispatcher()
 			);
 		});
 
diff --git a/lib/public/IPreview.php b/lib/public/IPreview.php
index c6417b4d182..90f7a56b66c 100644
--- a/lib/public/IPreview.php
+++ b/lib/public/IPreview.php
@@ -43,6 +43,11 @@ use OCP\Files\NotFoundException;
  */
 interface IPreview {
 
+	/**
+	 * @since 9.2.0
+	 */
+	const EVENT = self::class . ':' . 'PreviewRequested';
+
 	const MODE_FILL = 'fill';
 	const MODE_COVER = 'cover';