diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..0c97d470 --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +node_modules/ +.env +.DS_Store +npm-debug.log* diff --git a/chat-app/CHANGELOG.md b/chat-app/CHANGELOG.md new file mode 100644 index 00000000..6b11785f --- /dev/null +++ b/chat-app/CHANGELOG.md @@ -0,0 +1,31 @@ +## Changelist + +- Created Express backend with Socket.IO support +- Implemented real-time messaging between connected users +- Added chat history for newly connected users +- Added username persistence using localStorage +- Added online user counter +- Added join announcements with a 10-minute repeat window +- Added message timestamps +- Added Enter-to-send functionality, with Shift+Enter for a new line +- Added auto-scroll to latest message +- Added own-message highlighting to distinguish sent from received +- Styled chat interface with responsive CSS +- Configured CORS and Express middleware +- Added a /health endpoint for deployment health checks +- Rendered messages with textContent to prevent script injection +- Validated and trimmed usernames on the server +- Capped chat history at 200 messages and message length at 500 characters +- Re-sent the username on every reconnect so messages keep the correct author +- Cleared the message list before replaying history to prevent duplicates +- Loaded the Socket.IO client from a pinned CDN version matching the server +- Moved the backend URL into config.js so the frontend can be hosted separately +- Added a build step to override the backend URL from an environment variable +- Added .gitignore and removed node_modules from version control +- Added netlify.toml and render.yaml to configure both deployments +- Deployed the backend on Render and the frontend on Netlify + +## Known limitations + +- Messages are stored in memory, so the history resets when the backend restarts +- The backend sleeps after 15 minutes idle on the free tier, so the first load can take around 50 seconds 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b/chat-app/back-end/server.js new file mode 100644 index 00000000..f1d33cf1 --- /dev/null +++ b/chat-app/back-end/server.js @@ -0,0 +1,91 @@ +const path = require("path"); +const http = require("http"); +const express = require("express"); +const socketio = require("socket.io"); +const cors = require("cors"); + +const app = express(); +const server = http.createServer(app); + +// Set CORS_ORIGIN to your deployed frontend URL. "*" is fine for local dev. +const CORS_ORIGIN = process.env.CORS_ORIGIN || "*"; + +// Keeps memory bounded on a small host: the backlog is capped, and so is each message. +const MAX_HISTORY = 200; +const MAX_MESSAGE_LENGTH = 500; + +const io = socketio(server, { + cors: { + origin: CORS_ORIGIN, + methods: ["GET", "POST"], + }, +}); + +const users = {}; +const lastSeen = {}; +const messages = []; + +app.use(cors({ origin: CORS_ORIGIN })); +app.use(express.json()); + +// Serves the frontend too, so the whole app runs with one command locally. +// In production the frontend is deployed separately and this is simply unused. +app.use(express.static(path.join(__dirname, "..", "front-end"))); + +app.get("/health", (req, res) => { + res.send("World Chat backend is running"); +}); + +io.on("connection", (socket) => { + socket.emit("chat_history", messages); + + socket.on("new_user", (name) => { + if (typeof name !== "string" || !name.trim()) return; + + const username = name.trim().slice(0, 32); + const now = Date.now(); + const shouldAnnounce = + !lastSeen[username] || now - lastSeen[username] > 10 * 60 * 1000; + + users[socket.id] = username; + + if (shouldAnnounce) { + io.emit("user_connected", { + user: username, + timestamp: new Date().toLocaleString(), + }); + } + + lastSeen[username] = now; + io.emit("user_count", Object.keys(users).length); + }); + + socket.on("new_message", (message) => { + if (typeof message !== "string" || !message.trim()) return; + if (message.length > MAX_MESSAGE_LENGTH) return; + + const chatMessage = { + user: users[socket.id] || "Anonymous", + message, + timestamp: new Date().toLocaleString(), + }; + + messages.push(chatMessage); + if (messages.length > MAX_HISTORY) messages.shift(); + + io.emit("broadcast_message", chatMessage); + }); + + socket.on("disconnect", () => { + const username = users[socket.id]; + delete users[socket.id]; + if (username) lastSeen[username] = Date.now(); + io.emit("user_count", Object.keys(users).length); + }); +}); + +const PORT = process.env.PORT || 3001; + +server.listen(PORT, () => { + console.log(`Server running on http://localhost:${PORT}`); +}); diff --git a/chat-app/front-end/app.js b/chat-app/front-end/app.js new file mode 100644 index 00000000..00fd16b6 --- /dev/null +++ b/chat-app/front-end/app.js @@ -0,0 +1,98 @@ +// Default name used for the first chats. Change this if you want a different one. +const DEFAULT_USERNAME = "Anonymous"; + +// Set by config.js, which Netlify generates at build time from the BACKEND_URL +// environment variable. Empty means same-origin, which is what local dev wants. +const BACKEND_URL = (window.BACKEND_URL || "").replace(/\/+$/, ""); + +const IS_LOCAL = ["localhost", "127.0.0.1", ""].includes(location.hostname); + +document.addEventListener("DOMContentLoaded", () => { + const chats = document.getElementById("chats"); + const form = document.getElementById("chat-form"); + const input = document.getElementById("chat"); + const onlineCount = document.getElementById("online-count"); + const welcomeUser = document.getElementById("welcome-user"); + + // Without a backend URL the page is deployed but inert, and the failure is + // silent. Say so loudly instead of showing an empty chat that never works. + if (!BACKEND_URL && !IS_LOCAL) { + welcomeUser.textContent = + "⚠️ BACKEND_URL is not set — add it to this site's environment " + + "variables in Netlify, then redeploy. The chat cannot connect until then."; + form.hidden = true; + return; + } + + const socket = BACKEND_URL ? io(BACKEND_URL) : io(); + + let username = localStorage.getItem("chatUsername"); + + if (!username || !username.trim()) { + const entered = prompt("Enter your name:", DEFAULT_USERNAME); + username = entered && entered.trim() ? entered.trim() : DEFAULT_USERNAME; + localStorage.setItem("chatUsername", username); + } + + welcomeUser.textContent = `👋 Welcome, ${username}`; + + function scrollToBottom() { + chats.scrollTop = chats.scrollHeight; + } + + function createMessageElement(data) { + const p = document.createElement("p"); + p.textContent = `[${data.timestamp}] ${data.user}: ${data.message}`; + if (data.user === username) { + p.classList.add("my-message"); + } + return p; + } + + // Re-announce on every connect, not just the first: hosts drop idle sockets, + // and after a reconnect the server no longer knows who this socket is. + socket.on("connect", () => { + socket.emit("new_user", username); + }); + + // The server replays the backlog on every connection, so start from a clean + // box or a reconnect shows the whole history twice. + socket.on("chat_history", (messages) => { + chats.replaceChildren(); + messages.forEach((msg) => chats.appendChild(createMessageElement(msg))); + scrollToBottom(); + }); + + socket.on("broadcast_message", (data) => { + chats.appendChild(createMessageElement(data)); + scrollToBottom(); + }); + + socket.on("user_connected", (data) => { + const p = document.createElement("p"); + p.classList.add("system-message"); + p.textContent = `🟢 ${data.user} joined the chat`; + chats.appendChild(p); + scrollToBottom(); + }); + + socket.on("user_count", (count) => { + onlineCount.textContent = `👥 ${count} online`; + }); + + input.addEventListener("keydown", (e) => { + if (e.key === "Enter" && !e.shiftKey) { + e.preventDefault(); + form.requestSubmit(); + } + }); + + form.addEventListener("submit", (e) => { + e.preventDefault(); + const message = input.value.trim(); + if (!message) return; + socket.emit("new_message", message); + form.reset(); + input.focus(); + }); +}); diff --git a/chat-app/front-end/config.js b/chat-app/front-end/config.js new file mode 100644 index 00000000..9ade01ef --- /dev/null +++ b/chat-app/front-end/config.js @@ -0,0 +1,3 @@ +// The deployed backend. The Netlify build can override this by setting a +// BACKEND_URL environment variable; with no variable set, this value stands. +window.BACKEND_URL = "https://world-chat-backend-zlha.onrender.com"; diff --git a/chat-app/front-end/index.html b/chat-app/front-end/index.html new file mode 100644 index 00000000..ab634a0f --- /dev/null +++ b/chat-app/front-end/index.html @@ -0,0 +1,28 @@ + + + + + + World Chat + + + + + + + + +
+

🌍 World Chat

+
👥 0 online
+
+
+
+ + +
+
+ + diff --git a/chat-app/front-end/style.css b/chat-app/front-end/style.css new file mode 100644 index 00000000..18908e15 --- /dev/null +++ b/chat-app/front-end/style.css @@ -0,0 +1,102 @@ +* { + margin: 0; + padding: 0; + box-sizing: border-box; +} + +body { + font-family: Arial, sans-serif; + background: #f4f6f9; + display: flex; + justify-content: center; + align-items: center; + min-height: 100vh; +} + +.chat-container { + width: 800px; + max-width: 95%; + background: white; + border-radius: 16px; + padding: 20px; + box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08); +} + +h1 { + text-align: center; + margin-bottom: 10px; +} + +#online-count { + text-align: center; + color: #666; + margin-bottom: 15px; +} + +#chats { + height: 500px; + overflow-y: auto; + border: 1px solid #ddd; + border-radius: 10px; + padding: 15px; + background: #fafafa; + margin-bottom: 15px; +} + +#chats p { + background: #e8f0fe; + padding: 10px 14px; + border-radius: 10px; + margin-bottom: 10px; + word-wrap: break-word; +} + +.system-message { + background: transparent !important; + text-align: center; + color: #777; + font-style: italic; +} + +#guess { + display: flex; + gap: 10px; +} + +#chat { + flex: 1; + resize: none; + height: 60px; + padding: 12px; + border-radius: 10px; + border: 1px solid #ccc; + font-size: 14px; +} + +button { + border: none; + background: #2563eb; + color: white; + padding: 0 24px; + border-radius: 10px; + cursor: pointer; + font-weight: bold; +} + +button:hover { + opacity: 0.85; +} + +.my-message { + background: #d1fae5 !important; +} + +#chats p.my-message { + background-color: #d1fae5 !important; +} +#welcome-user { + text-align: center; + color: #444; + margin-bottom: 12px; + font-weight: bold; +} diff --git a/netlify.toml b/netlify.toml new file mode 100644 index 00000000..ddbc30b9 --- /dev/null +++ b/netlify.toml @@ -0,0 +1,21 @@ +# Netlify hosts the FRONTEND ONLY. +# The Socket.IO backend needs a long-lived Node process and must be deployed +# elsewhere (Render, Railway, Fly.io); Netlify has no WebSocket support. + +[build] + publish = "chat-app/front-end" + # Set BACKEND_URL in Site configuration > Environment variables. + command = "node scripts/inject-backend-url.mjs" + +# config.js carries the backend URL and is regenerated on every build, so it +# must never be served stale. app.js is small and changes often enough that +# skipping the cache costs nothing. +[[headers]] + for = "/config.js" + [headers.values] + Cache-Control = "no-cache" + +[[headers]] + for = "/app.js" + [headers.values] + Cache-Control = "no-cache" diff --git a/render.yaml b/render.yaml new file mode 100644 index 00000000..6413a739 --- /dev/null +++ b/render.yaml @@ -0,0 +1,16 @@ +# Render hosts the BACKEND ONLY (the frontend is on Netlify, see netlify.toml). +# Render supports WebSockets on all plans, including free. +services: + - type: web + name: world-chat-backend + runtime: node + plan: free + rootDir: chat-app/back-end + buildCommand: npm install + startCommand: npm start + healthCheckPath: /health + envVars: + # Set this in the Render dashboard to your Netlify URL once you have it, + # e.g. https://world-chat-june.netlify.app (no trailing slash). + - key: CORS_ORIGIN + sync: false diff --git a/scripts/inject-backend-url.mjs b/scripts/inject-backend-url.mjs new file mode 100644 index 00000000..e499b97a --- /dev/null +++ b/scripts/inject-backend-url.mjs @@ -0,0 +1,32 @@ +// Netlify build step: writes front-end/config.js from the BACKEND_URL build +// environment variable, so the deployed backend URL lives in Netlify's UI +// instead of being hardcoded in committed source. +// +// Run locally with no BACKEND_URL set and it writes an empty value, which is +// what local development wants (the backend serves the page itself). +import { writeFileSync } from "node:fs"; + +const raw = (process.env.BACKEND_URL || "").trim().replace(/\/+$/, ""); + +if (raw && !/^https?:\/\//.test(raw)) { + console.error(`BACKEND_URL must start with http:// or https:// (got "${raw}")`); + process.exit(1); +} + +// With no variable set, leave the committed config.js alone. It carries the +// deployed backend URL, so a build that cannot see the variable still ships a +// working site instead of silently blanking the address. +if (!raw) { + console.log("No BACKEND_URL set — keeping the committed config.js"); + process.exit(0); +} + +const out = new URL("../chat-app/front-end/config.js", import.meta.url); + +writeFileSync( + out, + `// Generated at build time by scripts/inject-backend-url.mjs — do not edit.\n` + + `window.BACKEND_URL = ${JSON.stringify(raw)};\n` +); + +console.log(`BACKEND_URL set to ${raw}`);