sminnee / silverstripe-framework

		$this->truncateDirectory(dirname($fileID), $from);

	}

	public function grant($filename, $hash) {

		$fileID = $this->getFileID($filename, $hash);

		$granted = Session::get(self::GRANTS_SESSION) ?: array();

		$granted[$fileID] = true;

		Session::set(self::GRANTS_SESSION, $granted);

	}

	public function revoke($filename, $hash) {

		$fileID = $this->getFileID($filename, $hash);

		Session::set(self::GRANTS_SESSION, $granted);

	}

	public function revoke($filename, $hash) {

		$fileID = $this->getFileID($filename, $hash);

		$granted = Session::get(self::GRANTS_SESSION) ?: array();

		unset($granted[$fileID]);

		if($granted) {

			Session::set(self::GRANTS_SESSION, $granted);

		} else {

			Session::clear(self::GRANTS_SESSION);

		}

	}

	public function canView($filename, $hash) {

		$fileID = $this->getFileID($filename, $hash);