Glasgow | 25-SDC-Nov | Nataliia Volkova | Sprint 3 | Middleware

App-2-middleware/.gitignore

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+/node_modules

App-2-middleware/backend/server.js

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+import express from "express";
+import cors from "cors";
+
+const app = express();
+
+app.use(express.json());
+app.use(cors());
+
+function authenticationCheck(req, res, next) {
+  const username = req.header("X-Username");
+
+  req.username = username ? username : null;
+  next();
+}
+
+function bodyMessageCheck(req, res, next) {
+  let body = req.body;
+
+  if (!Array.isArray(body) || !body.every((item) => typeof item === "string")) {
+    return res.status(400).json({ error: "Body must be array strings." });
+  }
+  req.bodyArray = body;
+  next();
+}
+
+app.use(authenticationCheck);
+
+app.post("/submit", bodyMessageCheck, (req, res) => {
+  const countArraySubjects = req.bodyArray.length;
+  const arraySubjects = req.bodyArray.join(", ");
+
+  const authMessage = req.username
+    ? `You are authenticated as: ${req.username}`
+    : `You are not authenticated`;
+
+  const bodyMessage =
+    countArraySubjects === 0
+      ? `You have requested information about 0 subjects.`
+      : countArraySubjects === 1
+        ? `You have requested information about 1 subject: ${arraySubjects}.`
+        : `You have requested information about ${countArraySubjects} subjects: ${arraySubjects}.`;
+
+  res.send(`${authMessage}\n\n${bodyMessage}`);
+});
+
+app.listen(3000, () => console.log("Server running on http://localhost:3000"));