fixed some bugs

nextcloud/server.ts

@@ -153,8 +153,13 @@ app.post('/dir', async (req, res) => {
 	try {
 		if (!req.fobj) return res.sendStatus(401);
 
-		const { fpath, deep } = req.fobj,
+		const { fpath, deep } = req.fobj;
-			filesInDir = await client.getDirectoryContents(fpath, {
+    if (!fpath) return res.sendStatus(400);
+    else if (!(await client.exists(fpath)) {
+        return res.status(404).send("Directory not found");
+    }
+
+		const filesInDir = await client.getDirectoryContents(fpath, {
 				deep
 			});
 
@@ -162,6 +167,7 @@ app.post('/dir', async (req, res) => {
 	}
 	catch (err) {
 		console.error(err);
+    res.sendStatus(500);
 	}
 });