Add cache 1 day cache to preview endpoint

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

core/Controller/PreviewController.php

@@ -24,6 +24,7 @@
 namespace OC\Core\Controller;
 
 use OCP\AppFramework\Controller;
+use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Files\File;
 use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataResponse;
@@ -44,6 +45,9 @@ class PreviewController extends Controller {
 	/** @var IPreview */
 	private $preview;
 
+	/** @var ITimeFactory */
+	private $timeFactory;
+
 	/**
 	 * PreviewController constructor.
 	 *
@@ -57,13 +61,15 @@ class PreviewController extends Controller {
 								IRequest $request,
 								IPreview $preview,
 								IRootFolder $root,
-								$userId
+								$userId,
+								ITimeFactory $timeFactory
 	) {
 		parent::__construct($appName, $request);
 
 		$this->preview = $preview;
 		$this->root = $root;
 		$this->userId = $userId;
+		$this->timeFactory = $timeFactory;
 	}
 
 	/**
@@ -105,7 +111,19 @@ class PreviewController extends Controller {
 
 		try {
 			$f = $this->preview->getPreview($file, $x, $y, !$a, $mode);
-			return new FileDisplayResponse($f, Http::STATUS_OK, ['Content-Type' => $f->getMimeType()]);
+			$response = new FileDisplayResponse($f, Http::STATUS_OK, ['Content-Type' => $f->getMimeType()]);
+
+			// Let cache this!
+			$response->addHeader('Pragma', 'public');
+
+			// Cache previews for 24H
+			$response->cacheFor(3600 * 24);
+			$expires = new \DateTime();
+			$expires->setTimestamp($this->timeFactory->getTime());
+			$expires->add(new \DateInterval('P1D'));
+			$response->addHeader('Expires', $expires->format(\DateTime::RFC2822));
+
+			return $response;
 		} catch (NotFoundException $e) {
 			return new DataResponse([], Http::STATUS_NOT_FOUND);
 		}

tests/Core/Controller/PreviewControllerTest.php

@@ -25,6 +25,7 @@ namespace Tests\Core\Controller;
 use OC\Core\Controller\PreviewController;
 use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Files\File;
 use OCP\Files\Folder;
 use OCP\Files\IRootFolder;
@@ -59,7 +60,8 @@ class PreviewControllerTest extends \Test\TestCase {
 			$this->createMock(IRequest::class),
 			$this->previewManager,
 			$this->rootFolder,
-			$this->userId
+			$this->userId,
+			$this->createMock(ITimeFactory::class)
 		);
 	}
 
@@ -216,8 +218,9 @@ class PreviewControllerTest extends \Test\TestCase {
 			->willReturn('myMime');
 
 		$res = $this->controller->getPreview('file', 10, 10, true, true, 'myMode');
-		$expected = new Http\FileDisplayResponse($preview, Http::STATUS_OK, ['Content-Type' => 'myMime']);
 
-		$this->assertEquals($expected, $res);
+		$this->assertEquals('myMime', $res->getHeaders()['Content-Type']);
+		$this->assertEquals(Http::STATUS_OK, $res->getStatus());
+		$this->assertEquals($preview, $this->invokePrivate($res, 'file'));
 	}
 }