updates

Author: ZabihollahNamazi

off-the-shell-middleware/app.js

@@ -1,7 +1,41 @@
 import express from "express";
+import usernameMiddleware from "./middleware/usernameMiddleware.js";
 
 const app = express();
 
-
 // built-in middleware
 app.use(express.json());
+
+app.post("/", usernameMiddleware, (req, res) => {
+  const subjects = req.body;
+
+  if (!Array.isArray(subjects)) {
+    return res.status(400).send("Body must be a JSON array");
+  }
+
+  if (!subjects.every(item => typeof item === "string")) {
+    return res.status(400).send("Array must contain only strings");
+  }
+
+  const auth =
+    req.username
+      ? `You are authenticated as ${req.username}.`
+      : "You are not authenticated.";
+
+  let message = "";
+
+  if (subjects.length === 0) {
+    message = "You have requested information about 0 subjects.";
+  } else if (subjects.length === 1) {
+    message = `You have requested information about 1 subject: ${subjects[0]}.`;
+  } else {
+    message = `You have requested information about ${subjects.length} subjects: ${subjects.join(", ")}.`;
+  }
+
+  res.send(`${auth}\n\n${message}`);
+});
+
+
+app.listen(4001, () => {
+  console.log("Server running on 4001");
+});