1 files changed, 93 insertions, 0 deletions
diff --git a/lib/private/Collaboration/Reference/FileReferenceProvider.php b/lib/private/Collaboration/Reference/FileReferenceProvider.php
new file mode 100644
index 00000000000..9fb083f749c
--- /dev/null
+++ b/lib/private/Collaboration/Reference/FileReferenceProvider.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * @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 OC\Collaboration\Reference;
+
+use OCP\Collaboration\Reference\IReference;
+use OCP\Collaboration\Reference\IReferenceProvider;
+use OCP\Files\IRootFolder;
+use OCP\Files\Node;
+use OCP\Files\NotFoundException;
+use OCP\IURLGenerator;
+use OCP\IUserSession;
+
+class FileReferenceProvider implements IReferenceProvider {
+	private IURLGenerator $urlGenerator;
+	private IRootFolder $rootFolder;
+	private ?string $userId;
+
+	public function __construct(IURLGenerator $urlGenerator, IRootFolder $rootFolder, IUserSession $userSession) {
+		$this->urlGenerator = $urlGenerator;
+		$this->rootFolder = $rootFolder;
+		$this->userId = $userSession->getUser() ? $userSession->getUser()->getUID() : null;
+	}
+
+	public function resolveReference(string $referenceText): ?IReference {
+		if (str_starts_with($referenceText, $this->urlGenerator->getAbsoluteURL('/index.php/f/')) || str_starts_with($referenceText, $this->urlGenerator->getAbsoluteURL('/f/'))) {
+			$reference = new Reference($referenceText);
+			try {
+				$this->fetchReference($reference);
+			} catch (NotFoundException $e) {
+				$reference->setAccessible(false);
+			}
+			return $reference;
+		}
+
+		return null;
+	}
+
+	/**
+	 * @throws \OCP\Files\NotPermittedException
+	 * @throws \OCP\Files\InvalidPathException
+	 * @throws NotFoundException
+	 * @throws \OC\User\NoUserException
+	 */
+	private function fetchReference(Reference $reference) {
+		$fileId = str_replace($this->urlGenerator->getAbsoluteURL('/index.php/f/'), '', $reference->getId());
+		$fileId = str_replace($this->urlGenerator->getAbsoluteURL('/f/'), '', $fileId);
+
+		$userFolder = $this->rootFolder->getUserFolder($this->userId);
+		$files = $userFolder->getById((int)$fileId);
+
+		if (empty($files)) {
+			throw new NotFoundException();
+		}
+
+		/** @var Node $file */
+		$file = array_shift($files);
+
+		$reference->setTitle($file->getName());
+		$reference->setDescription($file->getMimetype());
+		$reference->setUrl($this->urlGenerator->getAbsoluteURL('/index.php/f/' . $fileId));
+		$reference->setImageUrl($this->urlGenerator->linkToRouteAbsolute('core.Preview.getPreviewByFileId', ['x' => 1600, 'y' => 630, 'fileId' => $fileId]));
+
+		$reference->setRichObject('file', [
+			'id' => $file->getId(),
+			'name' => $file->getName(),
+			'size' => $file->getSize(),
+			'path' => $file->getPath(),
+			'link' => $reference->getUrl(),
+			'mimetype' => $file->getMimetype(),
+			'preview-available' => false
+		]);
+	}
+}