file - if 'name' param given, validate

src/file/server.ts

@@ -96,6 +96,12 @@ async function sendFileById (req: express.Request, res: express.Response): Promi
 	const fileId = new mongodb.ObjectID(req.params.id);
 	const file = await DriveFile.findOne({ _id: fileId });
 
+	// validate name
+	if (req.params.name !== undefined && req.params.name !== file.metadata.name) {
+		res.status(404).send('there is no file has given name');
+		return;
+	}
+
 	if (file == null) {
 		res.status(404).sendFile(`${__dirname}/assets/dummy.png`);
 		return;