1 files changed, 20 insertions, 2 deletions

diff --git a/apps/files_versions/lib/Controller/PreviewController.php b/apps/files_versions/lib/Controller/PreviewController.php
index 2c2793b6878..2c3ff8da70d 100644
--- a/apps/files_versions/lib/Controller/PreviewController.php
+++ b/apps/files_versions/lib/Controller/PreviewController.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -13,11 +14,13 @@ use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
 use OCP\AppFramework\Http\Attribute\OpenAPI;
 use OCP\AppFramework\Http\DataResponse;
 use OCP\AppFramework\Http\FileDisplayResponse;
+use OCP\AppFramework\Http\RedirectResponse;
 use OCP\Files\IRootFolder;
 use OCP\Files\NotFoundException;
 use OCP\IPreview;
 use OCP\IRequest;
 use OCP\IUserSession;
+use OCP\Preview\IMimeIconProvider;
 
 #[OpenAPI(scope: OpenAPI::SCOPE_DEFAULT)]
 class PreviewController extends Controller {
@@ -29,6 +32,7 @@ class PreviewController extends Controller {
 		private IUserSession $userSession,
 		private IVersionManager $versionManager,
 		private IPreview $previewManager,
+		private IMimeIconProvider $mimeIconProvider,
 	) {
 		parent::__construct($appName, $request);
 	}
@@ -40,9 +44,11 @@ class PreviewController extends Controller {
 	 * @param int $x Width of the preview
 	 * @param int $y Height of the preview
 	 * @param string $version Version of the file to get the preview for
-	 * @return FileDisplayResponse<Http::STATUS_OK, array{Content-Type: string}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_NOT_FOUND, list<empty>, array{}>
+	 * @param bool $mimeFallback Whether to fallback to the mime icon if no preview is available
+	 * @return FileDisplayResponse<Http::STATUS_OK, array{Content-Type: string}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_NOT_FOUND, list<empty>, array{}>|RedirectResponse<Http::STATUS_SEE_OTHER, array{}>
 	 *
 	 * 200: Preview returned
+	 * 303: Redirect to the mime icon url if mimeFallback is true
 	 * 400: Getting preview is not possible
 	 * 404: Preview not found
 	 */
@@ -53,19 +59,31 @@ class PreviewController extends Controller {
 		int $x = 44,
 		int $y = 44,
 		string $version = '',
+		bool $mimeFallback = false,
 	) {
 		if ($file === '' || $version === '' || $x === 0 || $y === 0) {
 			return new DataResponse([], Http::STATUS_BAD_REQUEST);
 		}
 
+		$versionFile = null;
 		try {
 			$user = $this->userSession->getUser();
 			$userFolder = $this->rootFolder->getUserFolder($user->getUID());
 			$file = $userFolder->get($file);
 			$versionFile = $this->versionManager->getVersionFile($user, $file, $version);
 			$preview = $this->previewManager->getPreview($versionFile, $x, $y, true, IPreview::MODE_FILL, $versionFile->getMimetype());
-			return new FileDisplayResponse($preview, Http::STATUS_OK, ['Content-Type' => $preview->getMimeType()]);
+			$response = new FileDisplayResponse($preview, Http::STATUS_OK, ['Content-Type' => $preview->getMimeType()]);
+			$response->cacheFor(3600 * 24, false, true);
+			return $response;
 		} catch (NotFoundException $e) {
+			// If we have no preview enabled, we can redirect to the mime icon if any
+			if ($mimeFallback && $versionFile !== null) {
+				$url = $this->mimeIconProvider->getMimeIconUrl($versionFile->getMimeType());
+				if ($url !== null) {
+					return new RedirectResponse($url);
+				}
+			}
+
 			return new DataResponse([], Http::STATUS_NOT_FOUND);
 		} catch (\InvalidArgumentException $e) {
 			return new DataResponse([], Http::STATUS_BAD_REQUEST);