backend refactored

code/backend/src/middleware/authenticateToken.ts

@@ -0,0 +1,43 @@
+import express, { NextFunction, Request, Response } from "express";
+import jwt from "jsonwebtoken";
+import dotenv from "dotenv";
+import { string } from "zod";
+const JWT_SECRET: string = process.env.TOKEN_SECRET!;
+
+interface JwtPayload {
+  username: string;
+  iat: number;
+  exp: number;
+}
+
+declare global {
+  namespace Express {
+    interface Request {
+      user?: JwtPayload;
+    }
+  }
+}
+
+export function authenticateToken() {
+  return (req: Request, res: Response, next: NextFunction) => {
+    const authHeader = req.headers["authorization"];
+    const token = authHeader && authHeader.split(" ")[1];
+
+    if (token == null) res.sendStatus(401);
+    else {
+      jwt.verify(
+        token,
+        process.env.TOKEN_SECRET as string,
+        (err: any, user: any) => {
+          console.log(err);
+
+          if (err) res.sendStatus(403);
+
+          req.user = user;
+
+          next();
+        },
+      );
+    }
+  };
+}