1 files changed, 80 insertions, 0 deletions
diff --git a/lib/Sabre/PublicAlbumAuthBackend.php b/lib/Sabre/PublicAlbumAuthBackend.php
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+++ b/lib/Sabre/PublicAlbumAuthBackend.php
@@ -0,0 +1,80 @@
+<?php
+/**
+ * @copyright Copyright (c) 2022 Louis Chmn <louis@chmn.me>
+ *
+ * @author Louis Chmn <louis@chmn.me>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\Photos\Sabre;
+
+use OC\Security\Bruteforce\Throttler;
+use OCA\Photos\Album\AlbumMapper;
+use OCA\Photos\Album\AlbumWithFiles;
+use OCP\IRequest;
+use Sabre\DAV\Auth\Backend\AbstractBasic;
+
+class PublicAlbumAuthBackend extends AbstractBasic {
+	private const BRUTEFORCE_ACTION = 'public_webdav_auth';
+	private ?AlbumWithFiles $album = null;
+	private IRequest $request;
+	private AlbumMapper $albumMapper;
+	private Throttler $throttler;
+
+	public function __construct(
+		IRequest $request,
+		AlbumMapper $albumMapper,
+		Throttler $throttler
+	) {
+		$this->request = $request;
+		$this->albumMapper = $albumMapper;
+		$this->throttler = $throttler;
+
+		// setup realm
+		$defaults = new \OCP\Defaults();
+		$this->realm = $defaults->getName();
+	}
+
+	/**
+	 * Validates the token.
+	 *
+	 * @param string $username
+	 * @return bool
+	 * @throws \Sabre\DAV\Exception\NotAuthenticated
+	 */
+	protected function validateUserPass($username, $password) {
+		$this->throttler->sleepDelayOrThrowOnMax($this->request->getRemoteAddress(), self::BRUTEFORCE_ACTION);
+
+		$albums = $this->albumMapper->getSharedAlbumsForCollaboratorWithFiles($username, AlbumMapper::TYPE_LINK);
+
+
+		if (count($albums) !== 1) {
+			$this->throttler->registerAttempt(self::BRUTEFORCE_ACTION, $this->request->getRemoteAddress());
+			return false;
+		}
+
+		$this->album = $albums[0];
+
+		\OC_User::setIncognitoMode(true);
+
+		return true;
+	}
+
+	public function getShare(): AlbumWithFiles {
+		assert($this->album !== null);
+		return $this->album;
+	}
+}