fix downloading trashbin items

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/Trash/GroupTrashItem.php

@@ -21,6 +21,7 @@
 
 namespace OCA\GroupFolders\Trash;
 
+use OC\Files\Storage\Wrapper\Jail;
 use OCA\Files_Trashbin\Trash\ITrashBackend;
 use OCA\Files_Trashbin\Trash\TrashItem;
 use OCP\Files\FileInfo;
@@ -53,4 +54,26 @@ public function getGroupFolderMountPoint(): string {
 	public function getTitle(): string {
 		return $this->getGroupFolderMountPoint() . '/' . $this->getOriginalLocation();
 	}
+
+	public function getStorage() {
+		// get the unjailed storage, since the trash item is outside the jail
+		// (the internal path is also unjailed)
+		$groupFolderStorage = parent::getStorage();
+		if ($groupFolderStorage->instanceOfStorage(Jail::class)) {
+			/** @var Jail $groupFolderStorage */
+			return $groupFolderStorage->getUnjailedStorage();
+		}
+		return $groupFolderStorage;
+	}
+
+	public function getMtime() {
+		// trashbin is currently (incorrectly) assuming these to be the same
+		return $this->getDeletedTime();
+	}
+
+	public function getInternalPath() {
+		// trashbin expects the path without the deletion timestamp
+		$path = parent::getInternalPath();
+		return rtrim($path, '.d' . $this->getDeletedTime());
+	}
 }