* * @author Christoph Wurst * @author Morris Jobke * @author Roeland Jago Douma * * @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 . * */ namespace OC\Core\Controller; use OCA\Files_Sharing\SharedStorage; use OCP\AppFramework\Controller; use OCP\AppFramework\Http; use OCP\AppFramework\Http\DataResponse; use OCP\AppFramework\Http\FileDisplayResponse; use OCP\AppFramework\Http\RedirectResponse; use OCP\Files\File; use OCP\Files\IRootFolder; use OCP\Files\Node; use OCP\Files\NotFoundException; use OCP\IPreview; use OCP\IRequest; use OCP\Preview\IMimeIconProvider; class PreviewController extends Controller { public function __construct( string $appName, IRequest $request, private IPreview $preview, private IRootFolder $root, private ?string $userId, private IMimeIconProvider $mimeIconProvider, ) { parent::__construct($appName, $request); } /** * @NoAdminRequired * @NoCSRFRequired * * Get a preview by file path * * @param string $file Path of the file * @param int $x Width of the preview * @param int $y Height of the preview * @param bool $a Whether to not crop the preview * @param bool $forceIcon Force returning an icon * @param string $mode How to crop the image * @param bool $mimeFallback Whether to fallback to the mime icon if no preview is available * @return FileDisplayResponse|DataResponse, array{}>|RedirectResponse * * 200: Preview returned * 303: Redirect to the mime icon url if mimeFallback is true * 400: Getting preview is not possible * 403: Getting preview is not allowed * 404: Preview not found */ public function getPreview( string $file = '', int $x = 32, int $y = 32, bool $a = false, bool $forceIcon = true, string $mode = 'fill', bool $mimeFallback = false): Http\Response { if ($file === '' || $x === 0 || $y === 0) { return new DataResponse([], Http::STATUS_BAD_REQUEST); } try { $userFolder = $this->root->getUserFolder($this->userId); $node = $userFolder->get($file); } catch (NotFoundException $e) { return new DataResponse([], Http::STATUS_NOT_FOUND); } return $this->fetchPreview($node, $x, $y, $a, $forceIcon, $mode, $mimeFallback); } /** * @NoAdminRequired * @NoCSRFRequired * * Get a preview by file ID * * @param int $fileId ID of the file * @param int $x Width of the preview * @param int $y Height of the preview * @param bool $a Whether to not crop the preview * @param bool $forceIcon Force returning an icon * @param string $mode How to crop the image * @param bool $mimeFallback Whether to fallback to the mime icon if no preview is available * @return FileDisplayResponse|DataResponse, array{}>|RedirectResponse * * 200: Preview returned * 303: Redirect to the mime icon url if mimeFallback is true * 400: Getting preview is not possible * 403: Getting preview is not allowed * 404: Preview not found */ public function getPreviewByFileId( int $fileId = -1, int $x = 32, int $y = 32, bool $a = false, bool $forceIcon = true, string $mode = 'fill', bool $mimeFallback = false) { if ($fileId === -1 || $x === 0 || $y === 0) { return new DataResponse([], Http::STATUS_BAD_REQUEST); } $userFolder = $this->root->getUserFolder($this->userId); $nodes = $userFolder->getById($fileId); if (\count($nodes) === 0) { return new DataResponse([], Http::STATUS_NOT_FOUND); } $node = array_pop($nodes); return $this->fetchPreview($node, $x, $y, $a, $forceIcon, $mode, $mimeFallback); } /** * @return FileDisplayResponse|DataResponse, array{}>|RedirectResponse */ private function fetchPreview( Node $node, int $x, int $y, bool $a, bool $forceIcon, string $mode, bool $mimeFallback = false) : Http\Response { if (!($node instanceof File) || (!$forceIcon && !$this->preview->isAvailable($node))) { return new DataResponse([], Http::STATUS_NOT_FOUND); } if (!$node->isReadable()) { return new DataResponse([], Http::STATUS_FORBIDDEN); } $storage = $node->getStorage(); if ($storage->instanceOfStorage(SharedStorage::class)) { /** @var SharedStorage $storage */ $share = $storage->getShare(); $attributes = $share->getAttributes(); if ($attributes !== null && $attributes->getAttribute('permissions', 'download') === false) { return new DataResponse([], Http::STATUS_FORBIDDEN); } } try { $f = $this->preview->getPreview($node, $x, $y, !$a, $mode); $response = new FileDisplayResponse($f, Http::STATUS_OK, [ 'Content-Type' => $f->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) { if ($url = $this->mimeIconProvider->getMimeIconUrl($node->getMimeType())) { return new RedirectResponse($url); } } return new DataResponse([], Http::STATUS_NOT_FOUND); } catch (\InvalidArgumentException $e) { return new DataResponse([], Http::STATUS_BAD_REQUEST); } } }