added endpoint for retrieving users' posts, updated userShouldExist middleware to account userId param.

backend/src/controllers/user.ts

@@ -4,6 +4,7 @@ import jwt from 'jsonwebtoken';
 
 import { AppDataSource } from '../data-source';
 import { User } from "../entity/User";
+import { Post } from "../entity/Post";
 
 class UserController {
     async register(req: Request, res: Response): Promise<void> {
@@ -30,6 +31,15 @@ class UserController {
         res.cookie("jwt", jwt.sign({ username, id: savedUser.id }, process.env.JWT_SECRET));
         res.status(200).redirect("/");
     }
+
+    async getPosts(req: Request, res: Response): Promise<void> {
+        const { userId } = req.params;
+
+        const posts = await AppDataSource.manager.findBy(Post, {authorId: Number.parseInt(userId)});
+        console.log(posts);
+        
+        res.status(200).send(posts);
+    }
 }
 
 export default new UserController();