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+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.8"
+ }
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+ "node_modules/wrappy": {
+ "version": "1.0.2",
+ "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
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+ "license": "ISC"
+ }
+ }
+}
diff --git a/chat-app/backend/package.json b/chat-app/backend/package.json
new file mode 100644
index 0000000..4bcf7ec
--- /dev/null
+++ b/chat-app/backend/package.json
@@ -0,0 +1,17 @@
+{
+ "name": "backend",
+ "version": "1.0.0",
+ "main": "index.js",
+ "type": "module",
+ "scripts": {
+ "test": "echo \"Error: no test specified\" && exit 1"
+ },
+ "keywords": [],
+ "author": "",
+ "license": "ISC",
+ "description": "",
+ "dependencies": {
+ "cors": "^2.8.6",
+ "express": "^5.2.1"
+ }
+}
diff --git a/chat-app/backend/server.js b/chat-app/backend/server.js
new file mode 100644
index 0000000..311a9c2
--- /dev/null
+++ b/chat-app/backend/server.js
@@ -0,0 +1,22 @@
+import express from "express";
+import cors from "cors";
+
+const app = express();
+const PORT = 3000;
+app.use(express.json());
+app.use(cors());
+let messages = [];
+
+app.get("/messages", (req, res) => {
+ res.json(messages);
+});
+
+app.post("/messages", (req, res) => {
+ const message = req.body;
+ messages.push(message);
+ res.status(201).json(message);
+});
+
+app.listen(PORT, () => {
+ console.log(`Server is running on port ${PORT}`);
+});
diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
new file mode 100644
index 0000000..551fc0a
--- /dev/null
+++ b/chat-app/frontend/index.html
@@ -0,0 +1,31 @@
+
+
+
+
+
+
+ Chat App
+
+
+
+
+
+
+
diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
new file mode 100644
index 0000000..891188d
--- /dev/null
+++ b/chat-app/frontend/script.js
@@ -0,0 +1,54 @@
+const messagesList = document.getElementById("messages-list");
+const form = document.getElementById("message-form");
+const input = document.getElementById("message-input");
+const usernameInput = document.getElementById("username-input");
+
+const BACKEND_URL =
+ "https://xwc7hmpmk5kvt9ktptcvuuke.hosting.codeyourfuture.io";
+
+// Fetch and display messages
+async function loadMessages() {
+ const response = await fetch(`${BACKEND_URL}/messages`);
+ const messages = await response.json();
+ messagesList.innerHTML = "";
+ messages.forEach((msg) => {
+ const li = document.createElement("li");
+ li.innerHTML = `
+
+ ${msg.text}
`;
+ messagesList.appendChild(li);
+ });
+}
+
+// Handle form submission
+form.addEventListener("submit", async (e) => {
+ e.preventDefault();
+
+ const newMessage = {
+ username: usernameInput.value,
+ text: input.value,
+ timeStamp: new Date().toLocaleTimeString("en-US", {
+ hour: "numeric",
+ minute: "2-digit",
+ hour12: true,
+ }),
+ };
+
+ await fetch(`${BACKEND_URL}/messages`, {
+ method: "POST",
+ headers: {
+ "Content-Type": "application/json",
+ },
+ body: JSON.stringify(newMessage),
+ });
+
+ input.value = "";
+ usernameInput.value = "";
+ loadMessages();
+});
+
+// Refresh messages every 2 seconds
+setInterval(loadMessages, 2000);
diff --git a/chat-app/frontend/styles.css b/chat-app/frontend/styles.css
new file mode 100644
index 0000000..ea5e954
--- /dev/null
+++ b/chat-app/frontend/styles.css
@@ -0,0 +1,92 @@
+body {
+ font-family: Arial, sans-serif;
+ background: #f2f2f2;
+ display: flex;
+ justify-content: center;
+ padding: 40px;
+}
+
+.chat-container {
+ width: 400px;
+ background: white;
+ border-radius: 10px;
+ box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
+ display: flex;
+ flex-direction: column;
+ overflow: hidden;
+}
+
+#messages-list {
+ list-style: none;
+ margin: 0;
+ padding: 14px;
+}
+
+#messages-list li {
+ background: #eaeeef;
+ padding: 10px 14px;
+ margin-bottom: 12px;
+ border-radius: 10px;
+ max-width: 80%;
+ box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
+}
+
+.message-header {
+ display: flex;
+ justify-content: space-between;
+ margin-bottom: 6px;
+ font-size: 0.85rem;
+ color: #555;
+}
+
+.username {
+ font-weight: bold;
+ color: #333;
+}
+
+.username::before {
+ content: "💬 ";
+}
+
+.timestamp {
+ font-size: 0.75rem;
+ color: #888;
+ align-items: flex-end;
+}
+
+.message-text {
+ font-size: 1rem;
+ color: #222;
+}
+
+form {
+ display: flex;
+ gap: 10px;
+ padding: 15px;
+ background: #fff;
+ border-top: 1px solid #ddd;
+}
+form input {
+ flex: 1;
+ min-width: 0; /* IMPORTANT: prevents overflow */
+}
+
+input {
+ flex: 1;
+ padding: 10px;
+ border-radius: 6px;
+ border: 1px solid #ccc;
+}
+
+button {
+ padding: 10px 15px;
+ border: none;
+ background: #0078ff;
+ color: white;
+ border-radius: 6px;
+ cursor: pointer;
+}
+
+button:hover {
+ background: #005fcc;
+}
diff --git a/middleware-custom/.gitignore b/middleware-custom/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/middleware-custom/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/middleware-custom/app.js b/middleware-custom/app.js
new file mode 100644
index 0000000..bf8bdd0
--- /dev/null
+++ b/middleware-custom/app.js
@@ -0,0 +1,32 @@
+import express from "express";
+import usernameMiddleware from "./middleware/usernameMiddleware.js";
+import jsonArrayMiddleware from "./middleware/jsonArrayMiddleware.js";
+
+const app = express();
+
+// POST route using both the JSON body parser and the username middleware
+app.post("/", usernameMiddleware, jsonArrayMiddleware, (req, res) => {
+ const username = req.username;
+ const subjects = req.jsonArray;
+
+ const authMessage = username
+ ? `You are authenticated as ${username}!`
+ : "You are not authenticated.";
+
+ const count = subjects.length;
+ const list = subjects.join(", ");
+
+ let subjectMessage;
+ if (count === 0) {
+ subjectMessage = "You have no subjects.";
+ } else if (count === 1) {
+ subjectMessage = `You have 1 subject: ${list}.`;
+ } else {
+ subjectMessage = `You have ${count} subjects: ${list}.`;
+ }
+ res.send(`${authMessage} ${subjectMessage}`);
+});
+
+app.listen(3000, () => {
+ console.log("Server is running on port 3000");
+});
diff --git a/middleware-custom/middleware/jsonArrayMiddleware.js b/middleware-custom/middleware/jsonArrayMiddleware.js
new file mode 100644
index 0000000..82d39be
--- /dev/null
+++ b/middleware-custom/middleware/jsonArrayMiddleware.js
@@ -0,0 +1,28 @@
+export default function jsonArrayMiddleware(req, res, next) {
+ let data = "";
+
+ req.on("data", (chunk) => {
+ data += chunk.toString();
+ });
+
+ req.on("end", () => {
+ try {
+ const parsedData = JSON.parse(data);
+
+ if (!Array.isArray(parsedData)) {
+ return res.status(400).send("Expected an array in the request body");
+ }
+ const allStrings = parsedData.every((item) => typeof item === "string");
+
+ if (!allStrings) {
+ return res.status(400).send("All items in the array must be strings");
+ }
+
+ req.jsonArray = parsedData;
+ next();
+ } catch (err) {
+ console.error("Error parsing JSON:", err);
+ res.status(400).send("Invalid JSON format");
+ }
+ });
+}
diff --git a/middleware-custom/middleware/usernameMiddleware.js b/middleware-custom/middleware/usernameMiddleware.js
new file mode 100644
index 0000000..1ecf616
--- /dev/null
+++ b/middleware-custom/middleware/usernameMiddleware.js
@@ -0,0 +1,7 @@
+export default function usernameMiddleware(req, res, next) {
+ const username = req.headers["x-username"];
+
+ req.username = username ?? null;
+
+ next();
+}
diff --git a/middleware-custom/package-lock.json b/middleware-custom/package-lock.json
new file mode 100644
index 0000000..20f4c86
--- /dev/null
+++ b/middleware-custom/package-lock.json
@@ -0,0 +1,827 @@
+{
+ "name": "middleware-custom",
+ "version": "1.0.0",
+ "lockfileVersion": 3,
+ "requires": true,
+ "packages": {
+ "": {
+ "name": "middleware-custom",
+ "version": "1.0.0",
+ "license": "ISC",
+ "dependencies": {
+ "express": "^5.2.1"
+ }
+ },
+ "node_modules/accepts": {
+ "version": "2.0.0",
+ "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
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+ "license": "MIT",
+ "dependencies": {
+ "mime-types": "^3.0.0",
+ "negotiator": "^1.0.0"
+ },
+ "engines": {
+ "node": ">= 0.6"
+ }
+ },
+ "node_modules/body-parser": {
+ "version": "2.2.2",
+ "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.2.tgz",
+ "integrity": "sha512-oP5VkATKlNwcgvxi0vM0p/D3n2C3EReYVX+DNYs5TjZFn/oQt2j+4sVJtSMr18pdRr8wjTcBl6LoV+FUwzPmNA==",
+ "license": "MIT",
+ "dependencies": {
+ "bytes": "^3.1.2",
+ "content-type": "^1.0.5",
+ "debug": "^4.4.3",
+ "http-errors": "^2.0.0",
+ "iconv-lite": "^0.7.0",
+ "on-finished": "^2.4.1",
+ "qs": "^6.14.1",
+ "raw-body": "^3.0.1",
+ "type-is": "^2.0.1"
+ },
+ "engines": {
+ "node": ">=18"
+ },
+ "funding": {
+ "type": "opencollective",
+ "url": "https://opencollective.com/express"
+ }
+ },
+ "node_modules/bytes": {
+ "version": "3.1.2",
+ "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
+ "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==",
+ "license": "MIT",
+ "engines": {
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+ }
+ },
+ "node_modules/call-bind-apply-helpers": {
+ "version": "1.0.2",
+ "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
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+ "license": "MIT",
+ "dependencies": {
+ "es-errors": "^1.3.0",
+ "function-bind": "^1.1.2"
+ },
+ "engines": {
+ "node": ">= 0.4"
+ }
+ },
+ "node_modules/call-bound": {
+ "version": "1.0.4",
+ "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
+ "integrity": "sha512-+ys997U96po4Kx/ABpBCqhA9EuxJaQWDQg7295H4hBphv3IZg0boBKuwYpt4YXp6MZ5AmZQnU/tyMTlRpaSejg==",
+ "license": "MIT",
+ "dependencies": {
+ "call-bind-apply-helpers": "^1.0.2",
+ "get-intrinsic": "^1.3.0"
+ },
+ "engines": {
+ "node": ">= 0.4"
+ },
+ "funding": {
+ "url": "https://github.com/sponsors/ljharb"
+ }
+ },
+ "node_modules/content-disposition": {
+ "version": "1.0.1",
+ "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.0.1.tgz",
+ "integrity": "sha512-oIXISMynqSqm241k6kcQ5UwttDILMK4BiurCfGEREw6+X9jkkpEe5T9FZaApyLGGOnFuyMWZpdolTXMtvEJ08Q==",
+ "license": "MIT",
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+ },
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+ "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
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+ "license": "MIT",
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+ }
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+ "license": "MIT",
+ "engines": {
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+ }
+ },
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+ "license": "MIT",
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+ },
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+ },
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+ }
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+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.8"
+ }
+ },
+ "node_modules/wrappy": {
+ "version": "1.0.2",
+ "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+ "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+ "license": "ISC"
+ }
+ }
+}
diff --git a/middleware-custom/package.json b/middleware-custom/package.json
new file mode 100644
index 0000000..b128d60
--- /dev/null
+++ b/middleware-custom/package.json
@@ -0,0 +1,16 @@
+{
+ "name": "middleware-custom",
+ "version": "1.0.0",
+ "main": "app.js",
+ "type": "module",
+ "scripts": {
+ "test": "echo \"Error: no test specified\" && exit 1"
+ },
+ "keywords": [],
+ "author": "",
+ "license": "ISC",
+ "description": "",
+ "dependencies": {
+ "express": "^5.2.1"
+ }
+}
diff --git a/middleware-off-the-shelf/.gitignore b/middleware-off-the-shelf/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/middleware-off-the-shelf/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/middleware-off-the-shelf/app.js b/middleware-off-the-shelf/app.js
new file mode 100644
index 0000000..a28a17a
--- /dev/null
+++ b/middleware-off-the-shelf/app.js
@@ -0,0 +1,48 @@
+import express from "express";
+import usernameMiddleware from "./middleware/usernameMiddleware.js";
+
+const app = express();
+app.use(express.json());
+
+function jsonArrayValidator(req, res, next) {
+ const body = req.body;
+
+ if (!Array.isArray(body)) {
+ return res.status(400).send("Bad Request: Expected a JSON array.");
+ }
+
+ const allStrings = body.every((item) => typeof item === "string");
+ if (!allStrings) {
+ return res
+ .status(400)
+ .send("Bad Request: All items in the array must be strings.");
+ }
+ req.subjects = body;
+ next();
+}
+
+app.post("/", usernameMiddleware, jsonArrayValidator, (req, res) => {
+ const username = req.username;
+ const subjects = req.subjects;
+
+ const authMessage = username
+ ? `You are authenticated as ${username}!`
+ : "You are not authenticated.";
+
+ const count = subjects.length;
+ const list = subjects.join(", ");
+
+ let subjectMessage;
+ if (count === 0) {
+ subjectMessage = "You have no subjects.";
+ } else if (count === 1) {
+ subjectMessage = `You have 1 subject: ${list}.`;
+ } else {
+ subjectMessage = `You have ${count} subjects: ${list}.`;
+ }
+ res.send(`${authMessage} ${subjectMessage}`);
+});
+
+app.listen(3000, () => {
+ console.log("Off-the-shelf server is running on port 3000");
+});
diff --git a/middleware-off-the-shelf/middleware/usernameMiddleware.js b/middleware-off-the-shelf/middleware/usernameMiddleware.js
new file mode 100644
index 0000000..704876f
--- /dev/null
+++ b/middleware-off-the-shelf/middleware/usernameMiddleware.js
@@ -0,0 +1,5 @@
+export default function usernameMiddleware(req, res, next) {
+ const username = req.header("X-Username");
+ req.username = username ?? null;
+ next();
+}
diff --git a/middleware-off-the-shelf/package-lock.json b/middleware-off-the-shelf/package-lock.json
new file mode 100644
index 0000000..6498166
--- /dev/null
+++ b/middleware-off-the-shelf/package-lock.json
@@ -0,0 +1,827 @@
+{
+ "name": "middleware-off-the-shelf",
+ "version": "1.0.0",
+ "lockfileVersion": 3,
+ "requires": true,
+ "packages": {
+ "": {
+ "name": "middleware-off-the-shelf",
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diff --git a/middleware-off-the-shelf/package.json b/middleware-off-the-shelf/package.json
new file mode 100644
index 0000000..cc1481e
--- /dev/null
+++ b/middleware-off-the-shelf/package.json
@@ -0,0 +1,16 @@
+{
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+ "author": "",
+ "license": "ISC",
+ "description": "",
+ "dependencies": {
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+ }
+}