continue refactor of backend to utilize ts, deprecate js

server/src/middleware/validation.ts

@@ -0,0 +1,46 @@
+'use strict';
+
+import type { Request, Response, NextFunction } from 'express';
+import * as notebookStore from '../stores/notebookStore.js';
+import type { Notebook } from '../stores/notebookStore.js';
+
+export interface NotebookRequest extends Request {
+  notebookId?: string;
+  notebook?: Notebook;
+}
+
+export function requireNotebookId(req: NotebookRequest, res: Response, next: NextFunction): void {
+  const notebookId = (req.body?.notebookId ?? req.query?.notebookId) as string | undefined;
+  if (!notebookId) {
+    res.status(400).json({ error: 'notebookId is required' });
+    return;
+  }
+  req.notebookId = notebookId;
+  next();
+}
+
+export function requireNotebook(req: NotebookRequest, res: Response, next: NextFunction): void {
+  const notebook = notebookStore.getNotebook(req.notebookId!);
+  if (!notebook) {
+    res.status(404).json({ error: 'notebook not found' });
+    return;
+  }
+  req.notebook = notebook;
+  next();
+}
+
+export function requireFile(req: Request, res: Response, next: NextFunction): void {
+  if (!req.file) {
+    res.status(400).json({ error: 'file is required' });
+    return;
+  }
+  next();
+}
+
+export function requireUrl(req: Request, res: Response, next: NextFunction): void {
+  if (!req.body?.url) {
+    res.status(400).json({ error: 'url is required' });
+    return;
+  }
+  next();
+}