From 1c935a04f5db7e9b85e27cca352a20a870257936 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Thu, 10 Sep 2026 23:07:25 +0100
Subject: [PATCH 1/9] feat: initialize backend and frontend for group chat
 application

- Added backend with Express server and message handling routes
- Implemented message sending, fetching, and reacting functionalities
- Created frontend HTML structure for chat interface
- Developed JavaScript for message rendering and user interactions
- Styled chat application with CSS for better user experience
---
 .gitignore                |   1 +
 backend/package-lock.json | 850 ++++++++++++++++++++++++++++++++++++++
 backend/package.json      |  18 +
 backend/server.js         |  77 ++++
 frontend/index.html       |  36 ++
 frontend/script.js        | 236 +++++++++++
 frontend/style.css        | 184 +++++++++
 7 files changed, 1402 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 backend/package-lock.json
 create mode 100644 backend/package.json
 create mode 100644 backend/server.js
 create mode 100644 frontend/index.html
 create mode 100644 frontend/script.js
 create mode 100644 frontend/style.css

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..b512c09d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/backend/package-lock.json b/backend/package-lock.json
new file mode 100644
index 00000000..bc0f08dd
--- /dev/null
+++ b/backend/package-lock.json
@@ -0,0 +1,850 @@
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diff --git a/backend/package.json b/backend/package.json
new file mode 100644
index 00000000..1f31efe1
--- /dev/null
+++ b/backend/package.json
@@ -0,0 +1,18 @@
+{
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+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "cors": "^2.8.6",
+    "crypto": "^1.0.1",
+    "express": "^5.2.1"
+  }
+}
diff --git a/backend/server.js b/backend/server.js
new file mode 100644
index 00000000..e57b6561
--- /dev/null
+++ b/backend/server.js
@@ -0,0 +1,77 @@
+import express from "express";
+import cors from "cors";
+import { randomUUID } from "crypto";
+
+const messages = [
+  {
+    id: 1,
+    message: "Hi! welcome to the chat app, you can send messages now.",
+    sender: "Merve Reis",
+    timestamp: 1,
+    likes: 0,
+    dislikes: 0,
+  },
+];
+const messagesById = new Map(messages.map((msg) => [String(msg.id), msg]));
+
+const app = express();
+const PORT = 3000;
+
+app.use(
+  cors({
+    origin: ["http://localhost:5501", "http://127.0.0.1:5500", ""],
+  }),
+);
+app.use(express.json());
+
+app.get("/getMessages", (req, res) => {
+  const since = parseInt(req.query.since) || 0;
+  const newMessages = messages.filter((msg) => msg.timestamp > since);
+  res.json(newMessages);
+});
+
+app.post("/sendMessage", (req, res) => {
+  const { message, sender, replyTo } = req.body;
+  if (message && sender) {
+    const timestamp = Date.now();
+    const newMessage = {
+      id: randomUUID(),
+      message,
+      sender,
+      timestamp,
+      likes: 0,
+      dislikes: 0,
+      replyTo: replyTo || null,
+    };
+
+    messages.push(newMessage);
+    messagesById.set(String(newMessage.id), newMessage);
+
+    res.status(200).json({ success: true });
+  } else {
+    res.status(400).json({ success: false, error: "Invalid message data" });
+  }
+});
+
+app.post("/reactMessage", (req, res) => {
+  const { id, reaction } = req.body;
+  const message = messagesById.get(String(id));
+
+  if (!message || !["like", "dislike"].includes(reaction)) {
+    return res
+      .status(400)
+      .json({ success: false, error: "Invalid reaction request" });
+  }
+
+  if (reaction === "like") {
+    message.likes += 1;
+  } else {
+    message.dislikes += 1;
+  }
+
+  res.status(200).json({ success: true, message });
+});
+
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});
diff --git a/frontend/index.html b/frontend/index.html
new file mode 100644
index 00000000..bf5709f6
--- /dev/null
+++ b/frontend/index.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+	<meta charset="UTF-8" />
+	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+	<title>Group Chat</title>
+	<link rel="stylesheet" href="style.css" />
+	<script src="script.js" defer></script>
+</head>
+
+<body>
+
+	<div class="chat-container">
+
+		<div class="chat-header">
+			Group Chat
+		</div>
+
+		<div class="chat-messages">
+		</div>
+
+		<form class="chat-input-area">
+			<div class="reply-preview hidden" id="replyPreview">
+				<span class="reply-preview-text" id="replyPreviewText"></span>
+				<button type="button" id="cancelReplyButton">Cancel</button>
+			</div>
+			<input type="text" id="messageText" placeholder="Type a message..." />
+			<button type="submit" id="submitMessage">Send</button>
+		</form>
+
+	</div>
+
+</body>
+
+</html>
\ No newline at end of file
diff --git a/frontend/script.js b/frontend/script.js
new file mode 100644
index 00000000..217d507f
--- /dev/null
+++ b/frontend/script.js
@@ -0,0 +1,236 @@
+const appServerURL = "http://127.0.0.1:3000";
+
+const currentUser = prompt("Enter your name:") || "Unknown";
+let lastTimestamp = 0;
+let displayedMessages = [];
+let replyToMessage = null;
+
+async function setup() {
+  await renderMessages();
+
+  const messageText = document.getElementById("messageText");
+  const submitMessage = document.getElementById("submitMessage");
+  const messagesContainer = document.querySelector(".chat-messages");
+  const cancelReplyButton = document.getElementById("cancelReplyButton");
+  const messageRefreshInterval = 500;
+
+  submitMessage.addEventListener("click", async (e) => {
+    e.preventDefault();
+    const message = messageText.value.trim();
+    if (message) {
+      const success = await sendMessage(message, replyToMessage?.id);
+      console.log(success);
+      if (success) {
+        messageText.value = "";
+        clearReplyPreview();
+        await renderMessages();
+      } else {
+        alert("Failed to send message. Please try again.");
+      }
+    }
+  });
+
+  cancelReplyButton.addEventListener("click", () => {
+    clearReplyPreview();
+  });
+
+  messagesContainer.addEventListener("click", async (e) => {
+    const likeButton = e.target.closest(".like-button");
+    const dislikeButton = e.target.closest(".dislike-button");
+    const replyButton = e.target.closest(".reply-button");
+
+    if (replyButton) {
+      const messageId = replyButton.dataset.id;
+      handleReplyClick(messageId);
+      return;
+    }
+
+    if (likeButton || dislikeButton) {
+      const button = likeButton || dislikeButton;
+      const messageId = button.dataset.id;
+      const reaction = likeButton ? "like" : "dislike";
+
+      const success = await reactToMessage(messageId, reaction);
+      if (success) {
+        await renderMessages();
+      }
+    }
+  });
+
+  setInterval(renderMessages, messageRefreshInterval);
+}
+
+async function renderMessages() {
+  const messages = await fetchMessages(lastTimestamp);
+  if (messages.length === 0) {
+    return;
+  }
+
+  if (messages.length > 0) {
+    const lastMessage = messages[messages.length - 1];
+    lastTimestamp = Math.max(lastTimestamp, lastMessage.timestamp);
+  }
+
+  messages.sort((a, b) => a.timestamp - b.timestamp);
+  displayedMessages.push(...messages);
+  appendMessages(messages);
+}
+
+function appendMessages(messages) {
+  const messagesContainer = document.querySelector(".chat-messages");
+
+  messages.forEach((message) => {
+    const role = currentUser === message.sender ? "sent" : "received";
+
+    const div = document.createElement("div");
+    div.className = `message ${role}`;
+
+    const senderName = document.createElement("span");
+    senderName.className = "sender-name";
+    senderName.textContent = message.sender;
+
+    if (message.replyTo) {
+      const originalMessage = displayedMessages.find(
+        (m) => String(m.id) === String(message.replyTo),
+      );
+      const replyPreview = document.createElement("div");
+      replyPreview.className = "message-reply";
+      replyPreview.textContent = originalMessage
+        ? `${originalMessage.sender}: ${originalMessage.message}`
+        : "Replied to a message";
+      div.append(replyPreview);
+    }
+
+    const text = document.createElement("p");
+    text.textContent = message.message;
+
+    const reactionRow = document.createElement("div");
+    reactionRow.className = "reaction-row";
+
+    const replyButton = document.createElement("button");
+    replyButton.className = "reply-button";
+    replyButton.dataset.id = message.id;
+    replyButton.textContent = "Reply";
+
+    const likeButton = document.createElement("button");
+    likeButton.className = "reaction-button like-button";
+    likeButton.dataset.id = message.id;
+    likeButton.textContent = `👍 ${message.likes || 0}`;
+
+    const dislikeButton = document.createElement("button");
+    dislikeButton.className = "reaction-button dislike-button";
+    dislikeButton.dataset.id = message.id;
+    dislikeButton.textContent = `👎 ${message.dislikes || 0}`;
+
+    if (role === "received") {
+      reactionRow.append(replyButton);
+    }
+    reactionRow.append(likeButton, dislikeButton);
+
+    div.append(senderName, text, reactionRow);
+    messagesContainer.appendChild(div);
+  });
+
+  messagesContainer.scrollTop = messagesContainer.scrollHeight;
+}
+
+async function fetchMessages(lastTimestamp = 0) {
+  try {
+    const response = await fetch(
+      `${appServerURL}/getMessages?since=${lastTimestamp}`,
+    );
+    const data = await response.json();
+    return data;
+  } catch (error) {
+    return [];
+  }
+}
+
+async function sendMessage(message, replyTo = null) {
+  try {
+    const response = await fetch(`${appServerURL}/sendMessage`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ message, sender: currentUser, replyTo }),
+    });
+    console.log(response);
+
+    const data = await response.json();
+    return data.success;
+  } catch (error) {
+    return false;
+  }
+}
+
+function handleReplyClick(messageId) {
+  const message = displayedMessages.find(
+    (m) => String(m.id) === String(messageId),
+  );
+  if (!message) {
+    return;
+  }
+
+  replyToMessage = message;
+  renderReplyPreview(message);
+}
+
+function renderReplyPreview(msg) {
+  const replyPreview = document.getElementById("replyPreview");
+  const replyPreviewText = document.getElementById("replyPreviewText");
+
+  if (!msg) {
+    replyPreview.classList.add("hidden");
+    replyPreviewText.textContent = "";
+    return;
+  }
+
+  replyPreviewText.textContent = `${msg.sender}: ${msg.message}`;
+  replyPreview.classList.remove("hidden");
+}
+
+function clearReplyPreview() {
+  replyToMessage = null;
+  renderReplyPreview(null);
+}
+
+async function reactToMessage(id, reaction) {
+  try {
+    const response = await fetch(`${appServerURL}/reactMessage`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ id, reaction }),
+    });
+    const data = await response.json();
+
+    if (data.success && data.message) {
+      updateMessageReaction(data.message);
+    }
+
+    return data.success;
+  } catch (error) {
+    return false;
+  }
+}
+
+function updateMessageReaction(message) {
+  const existingMessage = displayedMessages.find((m) => m.id === message.id);
+  if (existingMessage) {
+    Object.assign(existingMessage, message);
+  }
+
+  const likeButton = document.querySelector(
+    `.like-button[data-id="${message.id}"]`,
+  );
+  const dislikeButton = document.querySelector(
+    `.dislike-button[data-id="${message.id}"]`,
+  );
+
+  if (likeButton) {
+    likeButton.textContent = `👍 ${message.likes || 0}`;
+  }
+  if (dislikeButton) {
+    dislikeButton.textContent = `👎 ${message.dislikes || 0}`;
+  }
+}
+
+window.onload = setup;
diff --git a/frontend/style.css b/frontend/style.css
new file mode 100644
index 00000000..c198c892
--- /dev/null
+++ b/frontend/style.css
@@ -0,0 +1,184 @@
+body {
+  margin: 0;
+  font-family: Arial, sans-serif;
+  background-color: #2f2f2f;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  height: 100vh;
+}
+
+.chat-container {
+  width: 400px;
+  height: 600px;
+  background-color: #1e1e1e;
+  border-radius: 10px;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.chat-header {
+  background-color: #155aaa;
+  color: black;
+  padding: 15px;
+  font-size: 20px;
+  font-weight: bold;
+}
+
+.chat-messages {
+  flex: 1;
+  padding: 15px;
+  overflow-y: auto;
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+
+.message {
+  padding: 12px 14px;
+  border-radius: 14px;
+  max-width: 70%;
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+
+.received {
+  background-color: #3b3b3b;
+  color: white;
+  align-self: flex-start;
+}
+
+.sent {
+  background-color: #155aaa;
+  color: white;
+  align-self: flex-end;
+}
+
+.sender-name {
+  font-size: 12px;
+  opacity: 0.75;
+  margin-bottom: 4px;
+  font-weight: bold;
+}
+
+.message p {
+  margin: 0;
+  line-height: 1.4;
+}
+
+.reaction-row {
+  display: flex;
+  gap: 8px;
+}
+
+.reaction-button {
+  border: none;
+  border-radius: 999px;
+  padding: 7px 12px;
+  font-size: 13px;
+  cursor: pointer;
+  transition:
+    transform 0.15s ease,
+    background-color 0.15s ease;
+}
+
+.reaction-button:hover {
+  transform: translateY(-1px);
+}
+
+.reply-button {
+  border: none;
+  border-radius: 999px;
+  padding: 7px 12px;
+  font-size: 13px;
+  cursor: pointer;
+  background-color: rgba(255, 255, 255, 0.08);
+  color: #fff;
+}
+
+.message-reply {
+  border-left: 3px solid rgba(255, 255, 255, 0.35);
+  padding-left: 10px;
+  margin-bottom: 8px;
+  font-size: 13px;
+  opacity: 0.9;
+  max-height: 4.2em;
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
+
+.reply-preview {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+  padding: 8px 10px;
+  border-radius: 8px;
+  background-color: rgba(255, 255, 255, 0.08);
+  color: #fff;
+  margin-bottom: 10px;
+}
+
+.reply-preview.hidden {
+  display: none;
+}
+
+.reply-preview-text {
+  flex: 1;
+  font-size: 14px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+#cancelReplyButton {
+  border: none;
+  background: transparent;
+  color: #ffbaba;
+  cursor: pointer;
+}
+
+.like-button {
+  background-color: rgba(255, 255, 255, 0.12);
+  color: white;
+}
+
+.dislike-button {
+  background-color: rgba(255, 255, 255, 0.12);
+  color: white;
+  border: 1px solid red;
+}
+
+.chat-input-area {
+  display: flex;
+  flex-direction: column;
+  padding: 10px;
+  background-color: #2a2a2a;
+}
+
+.chat-input-area input {
+  flex: 1;
+  padding: 10px;
+  border: none;
+  border-radius: 5px;
+  font-size: 16px;
+  background-color: #121212;
+  color: white;
+}
+
+.chat-input-area input:focus {
+  outline: none;
+}
+
+.chat-input-area button {
+  margin-left: 10px;
+  padding: 10px 15px;
+  border: none;
+  background-color: #155aaa;
+  color: black;
+  border-radius: 5px;
+  cursor: pointer;
+}

From 649db141d20a5dc6aff99a5244cde7616b25a705 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Thu, 10 Sep 2026 23:13:16 +0100
Subject: [PATCH 2/9] feat: add Dockerfile for backend setup

---
 backend/Dockerfile | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 backend/Dockerfile

diff --git a/backend/Dockerfile b/backend/Dockerfile
new file mode 100644
index 00000000..cd32ad8f
--- /dev/null
+++ b/backend/Dockerfile
@@ -0,0 +1,6 @@
+FROM node:alpine
+ENV NODE_ENV=production
+COPY . /app
+WORKDIR /app
+RUN npm --omit=dev ci
+ENTRYPOINT ["node", "server.js"]
\ No newline at end of file

From 39df628d3b2bdbf6fc7c43f2cad83d73b124cee0 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Tue, 15 Sep 2026 21:56:47 +0100
Subject: [PATCH 3/9] feat: implement long-polling for message retrieval and
 update message handling

---
 backend/server.js  | 69 +++++++++++++++++++++++++++++++++++++++++++---
 frontend/script.js | 65 +++++++++++++++++++++++++++----------------
 2 files changed, 106 insertions(+), 28 deletions(-)

diff --git a/backend/server.js b/backend/server.js
index e57b6561..fd457583 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -13,32 +13,87 @@ const messages = [
   },
 ];
 const messagesById = new Map(messages.map((msg) => [String(msg.id), msg]));
+const waitingClients = [];
+
+// Date.now() aynı milisaniyede çakışabilir, timestamp'leri tekilleştiriyoruz
+let lastTimestamp = 0;
+function nextTimestamp() {
+  const now = Date.now();
+  lastTimestamp = now > lastTimestamp ? now : lastTimestamp + 1;
+  return lastTimestamp;
+}
+
+function releaseWaitingClients() {
+  for (const client of waitingClients) {
+    clearTimeout(client.timeout);
+    const messagesForClient = messages.filter(
+      (msg) => msg.timestamp > client.since,
+    );
+    client.res.json(messagesForClient);
+  }
+  waitingClients.length = 0;
+}
+
+function removeWaitingClient(client) {
+  const index = waitingClients.indexOf(client);
+  if (index !== -1) waitingClients.splice(index, 1);
+}
 
 const app = express();
 const PORT = 3000;
 
 app.use(
   cors({
-    origin: ["http://localhost:5501", "http://127.0.0.1:5500", ""],
+    origin: [
+      "http://localhost:5501",
+      "http://127.0.0.1:5501",
+      "http://localhost:5500",
+      "http://127.0.0.1:5500",
+      "",
+    ],
   }),
 );
 app.use(express.json());
 
 app.get("/getMessages", (req, res) => {
   const since = parseInt(req.query.since) || 0;
+  const longPoll = req.query.longPoll === "true";
   const newMessages = messages.filter((msg) => msg.timestamp > since);
-  res.json(newMessages);
+
+  if (newMessages.length > 0) {
+    res.json(newMessages);
+    return;
+  }
+
+  if (!longPoll) {
+    res.json([]);
+    return;
+  }
+
+  // Long-polling: bağlantıyı açık tut
+  const client = { res, since };
+
+  client.timeout = setTimeout(() => {
+    removeWaitingClient(client);
+    res.json([]);
+  }, 25000);
+
+  req.on("close", () => {
+    clearTimeout(client.timeout);
+    removeWaitingClient(client);
+  });
+
+  waitingClients.push(client);
 });
 
 app.post("/sendMessage", (req, res) => {
   const { message, sender, replyTo } = req.body;
   if (message && sender) {
-    const timestamp = Date.now();
     const newMessage = {
       id: randomUUID(),
       message,
       sender,
-      timestamp,
+      timestamp: nextTimestamp(),
       likes: 0,
       dislikes: 0,
       replyTo: replyTo || null,
@@ -47,6 +102,8 @@ app.post("/sendMessage", (req, res) => {
     messages.push(newMessage);
     messagesById.set(String(newMessage.id), newMessage);
 
+    releaseWaitingClients();
+
     res.status(200).json({ success: true });
   } else {
     res.status(400).json({ success: false, error: "Invalid message data" });
@@ -69,6 +126,10 @@ app.post("/reactMessage", (req, res) => {
     message.dislikes += 1;
   }
 
+  // yeniden damgala ki diğer kullanıcıların since filtresinden geçsin
+  message.timestamp = nextTimestamp();
+  releaseWaitingClients();
+
   res.status(200).json({ success: true, message });
 });
 
diff --git a/frontend/script.js b/frontend/script.js
index 217d507f..87cf30fc 100644
--- a/frontend/script.js
+++ b/frontend/script.js
@@ -1,4 +1,5 @@
-const appServerURL = "http://127.0.0.1:3000";
+const appServerURL =
+  "https://4cej0vpv9kt8dwfgdpr7259h.trainees.hosting.cyf.academy";
 
 const currentUser = prompt("Enter your name:") || "Unknown";
 let lastTimestamp = 0;
@@ -6,14 +7,10 @@ let displayedMessages = [];
 let replyToMessage = null;
 
 async function setup() {
-  await renderMessages();
-
   const messageText = document.getElementById("messageText");
   const submitMessage = document.getElementById("submitMessage");
   const messagesContainer = document.querySelector(".chat-messages");
   const cancelReplyButton = document.getElementById("cancelReplyButton");
-  const messageRefreshInterval = 500;
-
   submitMessage.addEventListener("click", async (e) => {
     e.preventDefault();
     const message = messageText.value.trim();
@@ -23,7 +20,6 @@ async function setup() {
       if (success) {
         messageText.value = "";
         clearReplyPreview();
-        await renderMessages();
       } else {
         alert("Failed to send message. Please try again.");
       }
@@ -52,28 +48,41 @@ async function setup() {
 
       const success = await reactToMessage(messageId, reaction);
       if (success) {
-        await renderMessages();
       }
     }
   });
 
-  setInterval(renderMessages, messageRefreshInterval);
+  pollForMessages();
 }
 
-async function renderMessages() {
-  const messages = await fetchMessages(lastTimestamp);
-  if (messages.length === 0) {
-    return;
-  }
+async function pollForMessages() {
+  try {
+    const messages = await fetchMessages(lastTimestamp);
+
+    if (messages.length > 0) {
+      messages.sort((a, b) => a.timestamp - b.timestamp);
+      const newMessages = messages.filter(
+        (message) =>
+          !displayedMessages.some(
+            (item) => String(item.id) === String(message.id),
+          ),
+      );
 
-  if (messages.length > 0) {
-    const lastMessage = messages[messages.length - 1];
-    lastTimestamp = Math.max(lastTimestamp, lastMessage.timestamp);
+      if (newMessages.length > 0) {
+        displayedMessages.push(...newMessages);
+        lastTimestamp = Math.max(
+          lastTimestamp,
+          ...newMessages.map((message) => message.timestamp),
+        );
+        appendMessages(newMessages);
+      }
+    }
+  } catch (error) {
+    setTimeout(pollForMessages, 1000);
+    return;
   }
 
-  messages.sort((a, b) => a.timestamp - b.timestamp);
-  displayedMessages.push(...messages);
-  appendMessages(messages);
+  setTimeout(pollForMessages, 500);
 }
 
 function appendMessages(messages) {
@@ -135,14 +144,22 @@ function appendMessages(messages) {
 }
 
 async function fetchMessages(lastTimestamp = 0) {
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), 30000); // > server's 25s hold
+
   try {
     const response = await fetch(
-      `${appServerURL}/getMessages?since=${lastTimestamp}`,
+      `${appServerURL}/getMessages?since=${lastTimestamp}&longPoll=true`,
+      { cache: "no-store", signal: controller.signal },
     );
-    const data = await response.json();
-    return data;
-  } catch (error) {
-    return [];
+
+    if (!response.ok) {
+      throw new Error(`Request failed with status ${response.status}`);
+    }
+
+    return response.json();
+  } finally {
+    clearTimeout(timer);
   }
 }
 

From c22864b44c1e8bb9e0d9f7a528c785cba00d91e4 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Tue, 15 Sep 2026 22:05:04 +0100
Subject: [PATCH 4/9] fix: update CORS configuration to remove unused origins

---
 backend/server.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/backend/server.js b/backend/server.js
index fd457583..ee8ca498 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -45,11 +45,9 @@ const PORT = 3000;
 app.use(
   cors({
     origin: [
-      "http://localhost:5501",
-      "http://127.0.0.1:5501",
       "http://localhost:5500",
       "http://127.0.0.1:5500",
-      "",
+      "https://7rsam4mmh651iuqzi0gz1ibv.trainees.hosting.cyf.academy/",
     ],
   }),
 );

From 835930f30bcd510e874add90714fa61c1b9892c8 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Tue, 15 Sep 2026 22:21:13 +0100
Subject: [PATCH 5/9] fix: update server and client URLs for deployment

---
 backend/server.js  | 2 +-
 frontend/script.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/backend/server.js b/backend/server.js
index ee8ca498..35ac7a7d 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -47,7 +47,7 @@ app.use(
     origin: [
       "http://localhost:5500",
       "http://127.0.0.1:5500",
-      "https://7rsam4mmh651iuqzi0gz1ibv.trainees.hosting.cyf.academy/",
+      "https://qgywlpv4fooqyvnhbqyxs5pw.trainees.hosting.cyf.academy/",
     ],
   }),
 );
diff --git a/frontend/script.js b/frontend/script.js
index 87cf30fc..0b2baf22 100644
--- a/frontend/script.js
+++ b/frontend/script.js
@@ -1,5 +1,5 @@
 const appServerURL =
-  "https://4cej0vpv9kt8dwfgdpr7259h.trainees.hosting.cyf.academy";
+  "https://su8eirz5gisnxsdt3fg4cyvr.trainees.hosting.cyf.academy/";
 
 const currentUser = prompt("Enter your name:") || "Unknown";
 let lastTimestamp = 0;

From d164cada47037ef7360a1c46c637f4e8a6972eb9 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Wed, 16 Sep 2026 15:06:28 +0100
Subject: [PATCH 6/9] fix: improve message filtering and update handling in
 polling function

---
 frontend/script.js | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/frontend/script.js b/frontend/script.js
index 0b2baf22..c4ce40dd 100644
--- a/frontend/script.js
+++ b/frontend/script.js
@@ -61,19 +61,28 @@ async function pollForMessages() {
 
     if (messages.length > 0) {
       messages.sort((a, b) => a.timestamp - b.timestamp);
-      const newMessages = messages.filter(
-        (message) =>
-          !displayedMessages.some(
-            (item) => String(item.id) === String(message.id),
-          ),
+
+      // since filtresinin ilerlemesi için timestamp'i her zaman güncelle,
+      // mesaj daha önce görülmüş (sadece reaksiyonu değişmiş) olsa bile.
+      lastTimestamp = Math.max(
+        lastTimestamp,
+        ...messages.map((message) => message.timestamp),
       );
 
-      if (newMessages.length > 0) {
-        displayedMessages.push(...newMessages);
-        lastTimestamp = Math.max(
-          lastTimestamp,
-          ...newMessages.map((message) => message.timestamp),
+      const newMessages = [];
+      for (const message of messages) {
+        const isNew = !displayedMessages.some(
+          (item) => String(item.id) === String(message.id),
         );
+        if (isNew) {
+          displayedMessages.push(message);
+          newMessages.push(message);
+        } else {
+          updateMessageReaction(message);
+        }
+      }
+
+      if (newMessages.length > 0) {
         appendMessages(newMessages);
       }
     }

From f000da2dae18084b7afb07b7fdf954f6cb14c4dc Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Wed, 16 Sep 2026 21:15:55 +0100
Subject: [PATCH 7/9] feat: initialize backend and frontend for chat
 application

- Added package.json for backend with necessary dependencies (express, cors, crypto).
- Implemented server.js for handling message retrieval, sending, and reactions with long-polling support.
- Created index.html for the frontend chat interface with a message input area and display for chat messages.
- Developed script.js to manage message fetching, sending, and user interactions (like, dislike, reply).
- Styled the chat application with style.css for a user-friendly interface.
---
 {backend => chat-app/backend}/Dockerfile        | 0
 {backend => chat-app/backend}/package-lock.json | 0
 {backend => chat-app/backend}/package.json      | 0
 {backend => chat-app/backend}/server.js         | 0
 {frontend => chat-app/frontend}/index.html      | 0
 {frontend => chat-app/frontend}/script.js       | 0
 {frontend => chat-app/frontend}/style.css       | 0
 7 files changed, 0 insertions(+), 0 deletions(-)
 rename {backend => chat-app/backend}/Dockerfile (100%)
 rename {backend => chat-app/backend}/package-lock.json (100%)
 rename {backend => chat-app/backend}/package.json (100%)
 rename {backend => chat-app/backend}/server.js (100%)
 rename {frontend => chat-app/frontend}/index.html (100%)
 rename {frontend => chat-app/frontend}/script.js (100%)
 rename {frontend => chat-app/frontend}/style.css (100%)

diff --git a/backend/Dockerfile b/chat-app/backend/Dockerfile
similarity index 100%
rename from backend/Dockerfile
rename to chat-app/backend/Dockerfile
diff --git a/backend/package-lock.json b/chat-app/backend/package-lock.json
similarity index 100%
rename from backend/package-lock.json
rename to chat-app/backend/package-lock.json
diff --git a/backend/package.json b/chat-app/backend/package.json
similarity index 100%
rename from backend/package.json
rename to chat-app/backend/package.json
diff --git a/backend/server.js b/chat-app/backend/server.js
similarity index 100%
rename from backend/server.js
rename to chat-app/backend/server.js
diff --git a/frontend/index.html b/chat-app/frontend/index.html
similarity index 100%
rename from frontend/index.html
rename to chat-app/frontend/index.html
diff --git a/frontend/script.js b/chat-app/frontend/script.js
similarity index 100%
rename from frontend/script.js
rename to chat-app/frontend/script.js
diff --git a/frontend/style.css b/chat-app/frontend/style.css
similarity index 100%
rename from frontend/style.css
rename to chat-app/frontend/style.css

From 3cb67fb56abaa07169e72125c6951a638bb56ca1 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Thu, 17 Sep 2026 16:09:01 +0100
Subject: [PATCH 8/9] chore: add package.json for middleware-exercises with
 express dependency

---
 middleware-exercises/Custom-Middleware.js     |  72 ++
 middleware-exercises/Off-shell-middlewares.js |  42 +
 middleware-exercises/package-lock.json        | 822 ++++++++++++++++++
 middleware-exercises/package.json             |  15 +
 4 files changed, 951 insertions(+)
 create mode 100644 middleware-exercises/Custom-Middleware.js
 create mode 100644 middleware-exercises/Off-shell-middlewares.js
 create mode 100644 middleware-exercises/package-lock.json
 create mode 100644 middleware-exercises/package.json

diff --git a/middleware-exercises/Custom-Middleware.js b/middleware-exercises/Custom-Middleware.js
new file mode 100644
index 00000000..20233299
--- /dev/null
+++ b/middleware-exercises/Custom-Middleware.js
@@ -0,0 +1,72 @@
+const express = require("express");
+
+const app = express();
+const PORT = 3000;
+
+// Middleware 1:check X-Username header
+function usernameMiddleware(req, res, next) {
+  const username = req.get("X-Username");
+
+  if (username) {
+    req.username = username;
+  } else {
+    req.username = null;
+  }
+
+  next();
+}
+
+// Middleware 2: parse and validate JSON array
+function bodyMiddleware(req, res, next) {
+  let body = "";
+
+  req.on("data", (chunk) => {
+    body += chunk;
+  });
+
+  req.on("end", () => {
+    try {
+      const parsedBody = JSON.parse(body);
+
+      if (!Array.isArray(parsedBody)) {
+        return res.status(400).send("Request body must be a JSON array.");
+      }
+
+      if (!parsedBody.every((item) => typeof item === "string")) {
+        return res.status(400).send("Array must contain only strings.");
+      }
+
+      req.body = parsedBody;
+      next();
+    } catch (error) {
+      res.status(400).send("Request body must be valid JSON.");
+    }
+  });
+}
+
+app.use(usernameMiddleware);
+app.use(bodyMiddleware);
+
+app.post("/", (req, res) => {
+  const subjects = req.body;
+
+  if (req.username) {
+    res.send(
+      `You are authenticated as ${req.username}.\n\n` +
+        `You have requested information about ${subjects.length} ` +
+        `${subjects.length === 1 ? "subject" : "subjects"}` +
+        `${subjects.length > 0 ? ": " + subjects.join(", ") : ""}.`,
+    );
+  } else {
+    res.send(
+      `You are not authenticated.\n\n` +
+        `You have requested information about ${subjects.length} ` +
+        `${subjects.length === 1 ? "subject" : "subjects"}` +
+        `${subjects.length > 0 ? ": " + subjects.join(", ") : ""}.`,
+    );
+  }
+});
+
+app.listen(PORT, () => {
+  console.log(`Server running on http://localhost:${PORT}`);
+});
diff --git a/middleware-exercises/Off-shell-middlewares.js b/middleware-exercises/Off-shell-middlewares.js
new file mode 100644
index 00000000..9bed4331
--- /dev/null
+++ b/middleware-exercises/Off-shell-middlewares.js
@@ -0,0 +1,42 @@
+import express from "express";
+
+const app = express();
+
+function usernameMiddleware(req, res, next) {
+  const username = req.get("X-Username");
+
+  if (username) {
+    req.username = username;
+  } else {
+    req.username = null;
+  }
+
+  next();
+}
+
+app.use(express.json());
+app.use(usernameMiddleware);
+
+app.post("/", (req, res) => {
+  const subjects = req.body;
+
+  if (req.username) {
+    res.send(
+      `You are authenticated as ${req.username}.\n\n` +
+        `You have requested information about ${subjects.length} ` +
+        `${subjects.length === 1 ? "subject" : "subjects"}` +
+        `${subjects.length > 0 ? `: ${subjects.join(", ")}` : ""}.`,
+    );
+  } else {
+    res.send(
+      `You are not authenticated.\n\n` +
+        `You have requested information about ${subjects.length} ` +
+        `${subjects.length === 1 ? "subject" : "subjects"}` +
+        `${subjects.length > 0 ? `: ${subjects.join(", ")}` : ""}.`,
+    );
+  }
+});
+
+app.listen(3000, () => {
+  console.log("Server running on http://localhost:3000");
+});
diff --git a/middleware-exercises/package-lock.json b/middleware-exercises/package-lock.json
new file mode 100644
index 00000000..8e8e3060
--- /dev/null
+++ b/middleware-exercises/package-lock.json
@@ -0,0 +1,822 @@
+{
+  "name": "middleware-exercises",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "middleware-exercises",
+      "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",
+      "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==",
+      "dependencies": {
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/body-parser": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.3.0.tgz",
+      "integrity": "sha512-2cGmJupaNgg+QUwVLAucDuWuoMZ6EX9iHDRswZ5lsNYEmwPaRknMPCLZz07yTzVq/83p4o/wzbDZbBrTvGGTIw==",
+      "dependencies": {
+        "bytes": "^3.1.2",
+        "content-type": "^2.0.0",
+        "debug": "^4.4.3",
+        "http-errors": "^2.0.1",
+        "iconv-lite": "^0.7.2",
+        "on-finished": "^2.4.1",
+        "qs": "^6.15.2",
+        "raw-body": "^3.0.2",
+        "type-is": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/body-parser/node_modules/content-type": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.1.0.tgz",
+      "integrity": "sha512-mj7UPXE0jaqaOsukNZRUEfEi2AcL7C/vwmwcHV0O97eO1E1pxBZuyjlZrx5seTaNBg1U6+o35wpa35Qfcc+7ag==",
+      "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==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "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",
+      "integrity": "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==",
+      "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==",
+      "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": "1.1.0",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.1.0.tgz",
+      "integrity": "sha512-5jRCH9Z/+DRP7rkvY83B+yGIGX96OYdJmzngqnw2SBSxqCFPd0w2km3s5iawpGX8krnwSGmF0FW5Nhr0Hfai3g==",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/content-type": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
+      "integrity": "sha512-nTjqfcBFEipKdXCv4YDQWCfmcLZKm81ldF0pAopTvyrFGVbcR6P/VAAd5G7N+0tTr8QqiU0tFadD6FK4NtJwOA==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.2.tgz",
+      "integrity": "sha512-yki5XnKuf750l50uGTllt6kKILY4nQ1eNIQatoXEByZ5dWgnKqbnqmTrBE5B4N7lrMJKQ2ytWMiTO2o0v6Ew/w==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie-signature": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.2.2.tgz",
+      "integrity": "sha512-D76uU73ulSXrD1UXF4KE2TMxVVwhsnCgfAyTg9k8P6KGZjlXKrOLe4dJQKI3Bxi5wjesZoFXJWElNWBjPZMbhg==",
+      "engines": {
+        "node": ">=6.6.0"
+      }
+    },
+    "node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/depd": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+      "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/dunder-proto": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
+      "integrity": "sha512-KIN/nDJBQRcXw0MLVhZE9iQHmG68qAVIBg9CqmUYjmQIhgij9U5MFvrqkUL5FbtyyzZuOeOt0zdeRe4UY7ct+A==",
+      "dependencies": {
+        "call-bind-apply-helpers": "^1.0.1",
+        "es-errors": "^1.3.0",
+        "gopd": "^1.2.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow=="
+    },
+    "node_modules/encodeurl": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-2.0.0.tgz",
+      "integrity": "sha512-Q0n9HRi4m6JuGIV1eFlmvJB7ZEVxu93IrMyiMsGC0lrMJMWzRgx6WGquyfQgZVb31vhGgXnfmPNNXmxnOkRBrg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/es-define-property": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/es-define-property/-/es-define-property-1.0.1.tgz",
+      "integrity": "sha512-e3nRfgfUZ4rNGL232gUgX06QNyyez04KdjFrF+LTRoOXmrOgFKDg4BCdsjW8EnT69eqdYGmRpJwiPVYNrCaW3g==",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/es-errors": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/es-errors/-/es-errors-1.3.0.tgz",
+      "integrity": "sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw==",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/es-object-atoms": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/es-object-atoms/-/es-object-atoms-1.1.2.tgz",
+      "integrity": "sha512-HWcBoN6NileqtSydK2FqHbS/LoDd2pqrnQHLyJzBj4kOp/ky2MWMN694xOfkK8/SnUsW2DH7EfyVlydKCsm1Zw==",
+      "dependencies": {
+        "es-errors": "^1.3.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha512-NiSupZ4OeuGwr68lGIeym/ksIZMJodUGOSCZ/FSnTxcrekbvqrgdUxlJOMpijaKZVjAJrWrGs/6Jy8OMuyj9ow=="
+    },
+    "node_modules/etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha512-aIL5Fx7mawVa300al2BnEE4iNvo1qETxLrPI/o05L7z6go7fCw1J6EQmbK4FmJ2AS7kgVF/KEZWufBfdClMcPg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/express": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-5.2.1.tgz",
+      "integrity": "sha512-hIS4idWWai69NezIdRt2xFVofaF4j+6INOpJlVOLDO8zXGpUVEVzIYk12UUi2JzjEzWL3IOAxcTubgz9Po0yXw==",
+      "dependencies": {
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+        "object-inspect": "^1.13.4",
+        "side-channel-list": "^1.0.1",
+        "side-channel-map": "^1.0.1",
+        "side-channel-weakmap": "^1.0.2"
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
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+    "node_modules/side-channel-list": {
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+        "object-inspect": "^1.13.4"
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
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+        "side-channel-map": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
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+    },
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+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/type-is": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.1.0.tgz",
+      "integrity": "sha512-faYHw0anBbc/kWF3zFTEnxSFOAGUX9GFbOBthvDdLsIlEoWOFOtS0zgCiQYwIskL9iGXZL3kAXD8OoZ4GmMATA==",
+      "dependencies": {
+        "content-type": "^2.0.0",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/type-is/node_modules/content-type": {
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+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.1.0.tgz",
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+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/unpipe": {
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+      "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=="
+    }
+  }
+}
diff --git a/middleware-exercises/package.json b/middleware-exercises/package.json
new file mode 100644
index 00000000..576894d2
--- /dev/null
+++ b/middleware-exercises/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "middleware-exercises",
+  "version": "1.0.0",
+  "description": "",
+  "main": "Custom-Middleware.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^5.2.1"
+  }
+}

From 8eda15ad8276e262ccd7658140f1bc9c66e886d7 Mon Sep 17 00:00:00 2001
From: mervereis <mervereis78@gmail.com>
Date: Thu, 17 Sep 2026 16:10:26 +0100
Subject: [PATCH 9/9] Remove unnecessary backend and frontend

---
 chat-app/backend/Dockerfile        |   6 -
 chat-app/backend/package-lock.json | 850 -----------------------------
 chat-app/backend/package.json      |  18 -
 chat-app/backend/server.js         | 136 -----
 chat-app/frontend/index.html       |  36 --
 chat-app/frontend/script.js        | 262 ---------
 chat-app/frontend/style.css        | 184 -------
 7 files changed, 1492 deletions(-)
 delete mode 100644 chat-app/backend/Dockerfile
 delete mode 100644 chat-app/backend/package-lock.json
 delete mode 100644 chat-app/backend/package.json
 delete mode 100644 chat-app/backend/server.js
 delete mode 100644 chat-app/frontend/index.html
 delete mode 100644 chat-app/frontend/script.js
 delete mode 100644 chat-app/frontend/style.css

diff --git a/chat-app/backend/Dockerfile b/chat-app/backend/Dockerfile
deleted file mode 100644
index cd32ad8f..00000000
--- a/chat-app/backend/Dockerfile
+++ /dev/null
@@ -1,6 +0,0 @@
-FROM node:alpine
-ENV NODE_ENV=production
-COPY . /app
-WORKDIR /app
-RUN npm --omit=dev ci
-ENTRYPOINT ["node", "server.js"]
\ No newline at end of file
diff --git a/chat-app/backend/package-lock.json b/chat-app/backend/package-lock.json
deleted file mode 100644
index bc0f08dd..00000000
--- a/chat-app/backend/package-lock.json
+++ /dev/null
@@ -1,850 +0,0 @@
-{
-  "name": "backend",
-  "version": "1.0.0",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "backend",
-      "version": "1.0.0",
-      "license": "ISC",
-      "dependencies": {
-        "cors": "^2.8.6",
-        "crypto": "^1.0.1",
-        "express": "^5.2.1"
-      }
-    },
-    "node_modules/accepts": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
-      "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==",
-      "dependencies": {
-        "mime-types": "^3.0.0",
-        "negotiator": "^1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.6"
-      }
-    },
-    "node_modules/body-parser": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.3.0.tgz",
-      "integrity": "sha512-2cGmJupaNgg+QUwVLAucDuWuoMZ6EX9iHDRswZ5lsNYEmwPaRknMPCLZz07yTzVq/83p4o/wzbDZbBrTvGGTIw==",
-      "dependencies": {
-        "bytes": "^3.1.2",
-        "content-type": "^2.0.0",
-        "debug": "^4.4.3",
-        "http-errors": "^2.0.1",
-        "iconv-lite": "^0.7.2",
-        "on-finished": "^2.4.1",
-        "qs": "^6.15.2",
-        "raw-body": "^3.0.2",
-        "type-is": "^2.1.0"
-      },
-      "engines": {
-        "node": ">=18"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/express"
-      }
-    },
-    "node_modules/body-parser/node_modules/content-type": {
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-      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.1.0.tgz",
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-      "engines": {
-        "node": ">=18"
-      },
-      "funding": {
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-      }
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-      "dependencies": {
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-        "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==",
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-        "get-intrinsic": "^1.3.0"
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-      "engines": {
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-      },
-      "funding": {
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-      },
-      "funding": {
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-}
diff --git a/chat-app/backend/package.json b/chat-app/backend/package.json
deleted file mode 100644
index 1f31efe1..00000000
--- a/chat-app/backend/package.json
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  "name": "backend",
-  "version": "1.0.0",
-  "description": "",
-  "main": "server.js",
-  "type": "module",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "node server.js"
-  },
-  "author": "",
-  "license": "ISC",
-  "dependencies": {
-    "cors": "^2.8.6",
-    "crypto": "^1.0.1",
-    "express": "^5.2.1"
-  }
-}
diff --git a/chat-app/backend/server.js b/chat-app/backend/server.js
deleted file mode 100644
index 35ac7a7d..00000000
--- a/chat-app/backend/server.js
+++ /dev/null
@@ -1,136 +0,0 @@
-import express from "express";
-import cors from "cors";
-import { randomUUID } from "crypto";
-
-const messages = [
-  {
-    id: 1,
-    message: "Hi! welcome to the chat app, you can send messages now.",
-    sender: "Merve Reis",
-    timestamp: 1,
-    likes: 0,
-    dislikes: 0,
-  },
-];
-const messagesById = new Map(messages.map((msg) => [String(msg.id), msg]));
-const waitingClients = [];
-
-// Date.now() aynı milisaniyede çakışabilir, timestamp'leri tekilleştiriyoruz
-let lastTimestamp = 0;
-function nextTimestamp() {
-  const now = Date.now();
-  lastTimestamp = now > lastTimestamp ? now : lastTimestamp + 1;
-  return lastTimestamp;
-}
-
-function releaseWaitingClients() {
-  for (const client of waitingClients) {
-    clearTimeout(client.timeout);
-    const messagesForClient = messages.filter(
-      (msg) => msg.timestamp > client.since,
-    );
-    client.res.json(messagesForClient);
-  }
-  waitingClients.length = 0;
-}
-
-function removeWaitingClient(client) {
-  const index = waitingClients.indexOf(client);
-  if (index !== -1) waitingClients.splice(index, 1);
-}
-
-const app = express();
-const PORT = 3000;
-
-app.use(
-  cors({
-    origin: [
-      "http://localhost:5500",
-      "http://127.0.0.1:5500",
-      "https://qgywlpv4fooqyvnhbqyxs5pw.trainees.hosting.cyf.academy/",
-    ],
-  }),
-);
-app.use(express.json());
-
-app.get("/getMessages", (req, res) => {
-  const since = parseInt(req.query.since) || 0;
-  const longPoll = req.query.longPoll === "true";
-  const newMessages = messages.filter((msg) => msg.timestamp > since);
-
-  if (newMessages.length > 0) {
-    res.json(newMessages);
-    return;
-  }
-
-  if (!longPoll) {
-    res.json([]);
-    return;
-  }
-
-  // Long-polling: bağlantıyı açık tut
-  const client = { res, since };
-
-  client.timeout = setTimeout(() => {
-    removeWaitingClient(client);
-    res.json([]);
-  }, 25000);
-
-  req.on("close", () => {
-    clearTimeout(client.timeout);
-    removeWaitingClient(client);
-  });
-
-  waitingClients.push(client);
-});
-
-app.post("/sendMessage", (req, res) => {
-  const { message, sender, replyTo } = req.body;
-  if (message && sender) {
-    const newMessage = {
-      id: randomUUID(),
-      message,
-      sender,
-      timestamp: nextTimestamp(),
-      likes: 0,
-      dislikes: 0,
-      replyTo: replyTo || null,
-    };
-
-    messages.push(newMessage);
-    messagesById.set(String(newMessage.id), newMessage);
-
-    releaseWaitingClients();
-
-    res.status(200).json({ success: true });
-  } else {
-    res.status(400).json({ success: false, error: "Invalid message data" });
-  }
-});
-
-app.post("/reactMessage", (req, res) => {
-  const { id, reaction } = req.body;
-  const message = messagesById.get(String(id));
-
-  if (!message || !["like", "dislike"].includes(reaction)) {
-    return res
-      .status(400)
-      .json({ success: false, error: "Invalid reaction request" });
-  }
-
-  if (reaction === "like") {
-    message.likes += 1;
-  } else {
-    message.dislikes += 1;
-  }
-
-  // yeniden damgala ki diğer kullanıcıların since filtresinden geçsin
-  message.timestamp = nextTimestamp();
-  releaseWaitingClients();
-
-  res.status(200).json({ success: true, 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
deleted file mode 100644
index bf5709f6..00000000
--- a/chat-app/frontend/index.html
+++ /dev/null
@@ -1,36 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-
-<head>
-	<meta charset="UTF-8" />
-	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
-	<title>Group Chat</title>
-	<link rel="stylesheet" href="style.css" />
-	<script src="script.js" defer></script>
-</head>
-
-<body>
-
-	<div class="chat-container">
-
-		<div class="chat-header">
-			Group Chat
-		</div>
-
-		<div class="chat-messages">
-		</div>
-
-		<form class="chat-input-area">
-			<div class="reply-preview hidden" id="replyPreview">
-				<span class="reply-preview-text" id="replyPreviewText"></span>
-				<button type="button" id="cancelReplyButton">Cancel</button>
-			</div>
-			<input type="text" id="messageText" placeholder="Type a message..." />
-			<button type="submit" id="submitMessage">Send</button>
-		</form>
-
-	</div>
-
-</body>
-
-</html>
\ No newline at end of file
diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
deleted file mode 100644
index c4ce40dd..00000000
--- a/chat-app/frontend/script.js
+++ /dev/null
@@ -1,262 +0,0 @@
-const appServerURL =
-  "https://su8eirz5gisnxsdt3fg4cyvr.trainees.hosting.cyf.academy/";
-
-const currentUser = prompt("Enter your name:") || "Unknown";
-let lastTimestamp = 0;
-let displayedMessages = [];
-let replyToMessage = null;
-
-async function setup() {
-  const messageText = document.getElementById("messageText");
-  const submitMessage = document.getElementById("submitMessage");
-  const messagesContainer = document.querySelector(".chat-messages");
-  const cancelReplyButton = document.getElementById("cancelReplyButton");
-  submitMessage.addEventListener("click", async (e) => {
-    e.preventDefault();
-    const message = messageText.value.trim();
-    if (message) {
-      const success = await sendMessage(message, replyToMessage?.id);
-      console.log(success);
-      if (success) {
-        messageText.value = "";
-        clearReplyPreview();
-      } else {
-        alert("Failed to send message. Please try again.");
-      }
-    }
-  });
-
-  cancelReplyButton.addEventListener("click", () => {
-    clearReplyPreview();
-  });
-
-  messagesContainer.addEventListener("click", async (e) => {
-    const likeButton = e.target.closest(".like-button");
-    const dislikeButton = e.target.closest(".dislike-button");
-    const replyButton = e.target.closest(".reply-button");
-
-    if (replyButton) {
-      const messageId = replyButton.dataset.id;
-      handleReplyClick(messageId);
-      return;
-    }
-
-    if (likeButton || dislikeButton) {
-      const button = likeButton || dislikeButton;
-      const messageId = button.dataset.id;
-      const reaction = likeButton ? "like" : "dislike";
-
-      const success = await reactToMessage(messageId, reaction);
-      if (success) {
-      }
-    }
-  });
-
-  pollForMessages();
-}
-
-async function pollForMessages() {
-  try {
-    const messages = await fetchMessages(lastTimestamp);
-
-    if (messages.length > 0) {
-      messages.sort((a, b) => a.timestamp - b.timestamp);
-
-      // since filtresinin ilerlemesi için timestamp'i her zaman güncelle,
-      // mesaj daha önce görülmüş (sadece reaksiyonu değişmiş) olsa bile.
-      lastTimestamp = Math.max(
-        lastTimestamp,
-        ...messages.map((message) => message.timestamp),
-      );
-
-      const newMessages = [];
-      for (const message of messages) {
-        const isNew = !displayedMessages.some(
-          (item) => String(item.id) === String(message.id),
-        );
-        if (isNew) {
-          displayedMessages.push(message);
-          newMessages.push(message);
-        } else {
-          updateMessageReaction(message);
-        }
-      }
-
-      if (newMessages.length > 0) {
-        appendMessages(newMessages);
-      }
-    }
-  } catch (error) {
-    setTimeout(pollForMessages, 1000);
-    return;
-  }
-
-  setTimeout(pollForMessages, 500);
-}
-
-function appendMessages(messages) {
-  const messagesContainer = document.querySelector(".chat-messages");
-
-  messages.forEach((message) => {
-    const role = currentUser === message.sender ? "sent" : "received";
-
-    const div = document.createElement("div");
-    div.className = `message ${role}`;
-
-    const senderName = document.createElement("span");
-    senderName.className = "sender-name";
-    senderName.textContent = message.sender;
-
-    if (message.replyTo) {
-      const originalMessage = displayedMessages.find(
-        (m) => String(m.id) === String(message.replyTo),
-      );
-      const replyPreview = document.createElement("div");
-      replyPreview.className = "message-reply";
-      replyPreview.textContent = originalMessage
-        ? `${originalMessage.sender}: ${originalMessage.message}`
-        : "Replied to a message";
-      div.append(replyPreview);
-    }
-
-    const text = document.createElement("p");
-    text.textContent = message.message;
-
-    const reactionRow = document.createElement("div");
-    reactionRow.className = "reaction-row";
-
-    const replyButton = document.createElement("button");
-    replyButton.className = "reply-button";
-    replyButton.dataset.id = message.id;
-    replyButton.textContent = "Reply";
-
-    const likeButton = document.createElement("button");
-    likeButton.className = "reaction-button like-button";
-    likeButton.dataset.id = message.id;
-    likeButton.textContent = `👍 ${message.likes || 0}`;
-
-    const dislikeButton = document.createElement("button");
-    dislikeButton.className = "reaction-button dislike-button";
-    dislikeButton.dataset.id = message.id;
-    dislikeButton.textContent = `👎 ${message.dislikes || 0}`;
-
-    if (role === "received") {
-      reactionRow.append(replyButton);
-    }
-    reactionRow.append(likeButton, dislikeButton);
-
-    div.append(senderName, text, reactionRow);
-    messagesContainer.appendChild(div);
-  });
-
-  messagesContainer.scrollTop = messagesContainer.scrollHeight;
-}
-
-async function fetchMessages(lastTimestamp = 0) {
-  const controller = new AbortController();
-  const timer = setTimeout(() => controller.abort(), 30000); // > server's 25s hold
-
-  try {
-    const response = await fetch(
-      `${appServerURL}/getMessages?since=${lastTimestamp}&longPoll=true`,
-      { cache: "no-store", signal: controller.signal },
-    );
-
-    if (!response.ok) {
-      throw new Error(`Request failed with status ${response.status}`);
-    }
-
-    return response.json();
-  } finally {
-    clearTimeout(timer);
-  }
-}
-
-async function sendMessage(message, replyTo = null) {
-  try {
-    const response = await fetch(`${appServerURL}/sendMessage`, {
-      method: "POST",
-      headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ message, sender: currentUser, replyTo }),
-    });
-    console.log(response);
-
-    const data = await response.json();
-    return data.success;
-  } catch (error) {
-    return false;
-  }
-}
-
-function handleReplyClick(messageId) {
-  const message = displayedMessages.find(
-    (m) => String(m.id) === String(messageId),
-  );
-  if (!message) {
-    return;
-  }
-
-  replyToMessage = message;
-  renderReplyPreview(message);
-}
-
-function renderReplyPreview(msg) {
-  const replyPreview = document.getElementById("replyPreview");
-  const replyPreviewText = document.getElementById("replyPreviewText");
-
-  if (!msg) {
-    replyPreview.classList.add("hidden");
-    replyPreviewText.textContent = "";
-    return;
-  }
-
-  replyPreviewText.textContent = `${msg.sender}: ${msg.message}`;
-  replyPreview.classList.remove("hidden");
-}
-
-function clearReplyPreview() {
-  replyToMessage = null;
-  renderReplyPreview(null);
-}
-
-async function reactToMessage(id, reaction) {
-  try {
-    const response = await fetch(`${appServerURL}/reactMessage`, {
-      method: "POST",
-      headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ id, reaction }),
-    });
-    const data = await response.json();
-
-    if (data.success && data.message) {
-      updateMessageReaction(data.message);
-    }
-
-    return data.success;
-  } catch (error) {
-    return false;
-  }
-}
-
-function updateMessageReaction(message) {
-  const existingMessage = displayedMessages.find((m) => m.id === message.id);
-  if (existingMessage) {
-    Object.assign(existingMessage, message);
-  }
-
-  const likeButton = document.querySelector(
-    `.like-button[data-id="${message.id}"]`,
-  );
-  const dislikeButton = document.querySelector(
-    `.dislike-button[data-id="${message.id}"]`,
-  );
-
-  if (likeButton) {
-    likeButton.textContent = `👍 ${message.likes || 0}`;
-  }
-  if (dislikeButton) {
-    dislikeButton.textContent = `👎 ${message.dislikes || 0}`;
-  }
-}
-
-window.onload = setup;
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
deleted file mode 100644
index c198c892..00000000
--- a/chat-app/frontend/style.css
+++ /dev/null
@@ -1,184 +0,0 @@
-body {
-  margin: 0;
-  font-family: Arial, sans-serif;
-  background-color: #2f2f2f;
-  display: flex;
-  justify-content: center;
-  align-items: center;
-  height: 100vh;
-}
-
-.chat-container {
-  width: 400px;
-  height: 600px;
-  background-color: #1e1e1e;
-  border-radius: 10px;
-  display: flex;
-  flex-direction: column;
-  overflow: hidden;
-}
-
-.chat-header {
-  background-color: #155aaa;
-  color: black;
-  padding: 15px;
-  font-size: 20px;
-  font-weight: bold;
-}
-
-.chat-messages {
-  flex: 1;
-  padding: 15px;
-  overflow-y: auto;
-  display: flex;
-  flex-direction: column;
-  gap: 10px;
-}
-
-.message {
-  padding: 12px 14px;
-  border-radius: 14px;
-  max-width: 70%;
-  display: flex;
-  flex-direction: column;
-  gap: 10px;
-}
-
-.received {
-  background-color: #3b3b3b;
-  color: white;
-  align-self: flex-start;
-}
-
-.sent {
-  background-color: #155aaa;
-  color: white;
-  align-self: flex-end;
-}
-
-.sender-name {
-  font-size: 12px;
-  opacity: 0.75;
-  margin-bottom: 4px;
-  font-weight: bold;
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