Created the authentication middleware

server/middlewares/authenticate.js

@@ -0,0 +1,15 @@
+const {validateSession} = require("../controller/session");
+const {getUserById} = require("../controller/user");
+
+module.exports = async (req, res, next) => {
+    const token = req.header("Authorization")?.split(" ");
+    if (!token) return res.status(400).json({message: "You need to provide a token"});
+    if (!(token.length === 2 && token[0] === "Bearer")) return res.status(400).json({message: "You need to provide a bearer token"});
+
+    const user = await validateSession(token[1]);
+    if (user === null) return res.status(401).json({message: "The provided token is incorrect"});
+
+    req.user = await getUserById(user.userId);
+
+    next();
+}