diff --git a/src/problem1/.keep b/src/problem1/.keep deleted file mode 100644 index e69de29bb..000000000 diff --git a/src/problem2/index.html b/src/problem2/index.html deleted file mode 100644 index 4058a68bf..000000000 --- a/src/problem2/index.html +++ /dev/null @@ -1,27 +0,0 @@ - - - - - Fancy Form - - - - - - - - -
-
Swap
- - - - - - - -
- - - - diff --git a/src/problem2/script.js b/src/problem2/script.js deleted file mode 100644 index e69de29bb..000000000 diff --git a/src/problem2/style.css b/src/problem2/style.css deleted file mode 100644 index 915af91c7..000000000 --- a/src/problem2/style.css +++ /dev/null @@ -1,8 +0,0 @@ -body { - display: flex; - flex-direction: row; - align-items: center; - justify-content: center; - min-width: 360px; - font-family: Arial, Helvetica, sans-serif; -} diff --git a/src/problem3/.keep b/src/problem3/.keep deleted file mode 100644 index e69de29bb..000000000 diff --git a/src/problem4/sum-to-n.ts b/src/problem4/sum-to-n.ts new file mode 100644 index 000000000..349e9df45 --- /dev/null +++ b/src/problem4/sum-to-n.ts @@ -0,0 +1,27 @@ +//Implementation A: Iterative loop +export const sum_to_n_a = (n: number): number => { + if (n <= 0) return 0; + + let sum = 0; + for (let i = 1; i <= n; i++) { + sum += i; + } + return sum; +}; + +// Implementation B: Mathematical formula +export const sum_to_n_b = (n: number): number => { + if (n <= 0) return 0; + + return (n * (n + 1)) / 2; +}; + +// Implementation C: Functional style (Array + reduce) +export const sum_to_n_c = (n: number): number => { + if (n <= 0) return 0; + + return Array.from({ length: n }, (_, i) => i + 1).reduce( + (acc, cur) => acc + cur, + 0 + ); +}; diff --git a/src/problem5/.gitignore b/src/problem5/.gitignore new file mode 100644 index 000000000..2df315e74 --- /dev/null +++ b/src/problem5/.gitignore @@ -0,0 +1,7 @@ +node_modules/ +dist/ +data.db +*.log +.DS_Store +.env + diff --git a/src/problem5/README.md b/src/problem5/README.md new file mode 100644 index 000000000..e9bb28f2e --- /dev/null +++ b/src/problem5/README.md @@ -0,0 +1,340 @@ +# Problem 5 - ExpressJS Backend with TypeScript + +A RESTful API backend built with ExpressJS and TypeScript, providing CRUD operations for managing items with database persistence. + +## Features + +- ✅ **Create** - Add new items +- ✅ **Read** - List items with filters and get item details +- ✅ **Update** - Modify existing items +- ✅ **Delete** - Remove items +- ✅ **Filtering** - Search and filter items by status, name, or description +- ✅ **Database** - SQLite database for data persistence + +## Tech Stack + +- **ExpressJS** - Web framework +- **TypeScript** - Type-safe JavaScript +- **SQLite** (better-sqlite3) - Lightweight database +- **CORS** - Cross-origin resource sharing + +## Project Structure + +``` +src/problem5/ +├── src/ +│ ├── main.ts # Main application entry point +│ ├── database/ +│ │ └── db.ts # Database connection and schema +│ ├── types/ +│ │ └── item.ts # TypeScript interfaces +│ ├── models/ +│ │ └── itemModel.ts # Data access layer +│ ├── controllers/ +│ │ └── itemController.ts # Business logic +│ └── routes/ +│ └── itemRoutes.ts # API routes +├── package.json +├── tsconfig.json +└── README.md +``` + +## Prerequisites + +- Node.js (v16 or higher) +- npm or yarn + +## Installation + +1. Navigate to the problem5 directory: + +```bash +cd src/problem5 +``` + +2. Install dependencies: + +```bash +npm install +``` + +## Configuration + +The application uses the following default configuration: + +- **Port**: 3000 (can be overridden with `PORT` environment variable) +- **Database**: SQLite database file (`data.db`) will be created automatically in the project root + +## Running the Application + +### Development Mode (with auto-reload) + +```bash +npm run dev +``` + +### Production Mode + +1. Build the TypeScript code: + +```bash +npm run build +``` + +2. Start the server: + +```bash +npm start +``` + +The server will start on `http://localhost:3000` + +## API Endpoints + +### Base URL + +``` +http://localhost:3000/api/items +``` + +### 1. Create Item + +**POST** `/api/items` + +Request body: + +```json +{ + "name": "Item Name", + "description": "Item description (optional)", + "status": "active" // optional, defaults to "active" +} +``` + +Response: `201 Created` + +```json +{ + "id": 1, + "name": "Item Name", + "description": "Item description", + "status": "active", + "created_at": "2024-01-01 12:00:00", + "updated_at": "2024-01-01 12:00:00" +} +``` + +### 2. List Items (with filters) + +**GET** `/api/items` + +Query parameters: + +- `status` (optional) - Filter by status (e.g., `?status=active`) +- `search` (optional) - Search in name and description (e.g., `?search=keyword`) +- `limit` (optional) - Limit number of results (e.g., `?limit=10`) +- `offset` (optional) - Pagination offset (e.g., `?offset=0`) + +Examples: + +- Get all items: `GET /api/items` +- Filter by status: `GET /api/items?status=active` +- Search items: `GET /api/items?search=keyword` +- Pagination: `GET /api/items?limit=10&offset=0` +- Combined filters: `GET /api/items?status=active&search=test&limit=5` + +Response: `200 OK` + +```json +[ + { + "id": 1, + "name": "Item Name", + "description": "Item description", + "status": "active", + "created_at": "2024-01-01 12:00:00", + "updated_at": "2024-01-01 12:00:00" + } +] +``` + +### 3. Get Item Details + +**GET** `/api/items/:id` + +Response: `200 OK` + +```json +{ + "id": 1, + "name": "Item Name", + "description": "Item description", + "status": "active", + "created_at": "2024-01-01 12:00:00", + "updated_at": "2024-01-01 12:00:00" +} +``` + +Error: `404 Not Found` if item doesn't exist + +### 4. Update Item + +**PUT** `/api/items/:id` + +Request body (all fields optional): + +```json +{ + "name": "Updated Name", + "description": "Updated description", + "status": "inactive" +} +``` + +Response: `200 OK` + +```json +{ + "id": 1, + "name": "Updated Name", + "description": "Updated description", + "status": "inactive", + "created_at": "2024-01-01 12:00:00", + "updated_at": "2024-01-01 12:30:00" +} +``` + +Error: `404 Not Found` if item doesn't exist + +### 5. Delete Item + +**DELETE** `/api/items/:id` + +Response: `204 No Content` + +Error: `404 Not Found` if item doesn't exist + +### Health Check + +**GET** `/health` + +Response: `200 OK` + +```json +{ + "status": "ok", + "message": "Server is running" +} +``` + +## Example Usage + +### Using cURL + +```bash +# Create an item +curl -X POST http://localhost:3000/api/items \ + -H "Content-Type: application/json" \ + -d '{"name": "Test Item", "description": "This is a test"}' + +# List all items +curl http://localhost:3000/api/items + +# Get item by ID +curl http://localhost:3000/api/items/1 + +# Update item +curl -X PUT http://localhost:3000/api/items/1 \ + -H "Content-Type: application/json" \ + -d '{"name": "Updated Item", "status": "inactive"}' + +# Delete item +curl -X DELETE http://localhost:3000/api/items/1 + +# Search items +curl "http://localhost:3000/api/items?search=test&status=active" +``` + +### Using JavaScript/TypeScript + +```typescript +// Create item +const response = await fetch('http://localhost:3000/api/items', { + method: 'POST', + headers: { 'Content-Type': 'application/json' }, + body: JSON.stringify({ + name: 'Test Item', + description: 'This is a test', + }), +}); +const item = await response.json(); + +// List items with filters +const items = await fetch( + 'http://localhost:3000/api/items?status=active&limit=10' +).then((res) => res.json()); +``` + +## Database + +The application uses SQLite for data persistence. The database file (`data.db`) is automatically created in the project root when the server starts for the first time. + +### Schema + +```sql +CREATE TABLE items ( + id INTEGER PRIMARY KEY AUTOINCREMENT, + name TEXT NOT NULL, + description TEXT, + status TEXT DEFAULT 'active', + created_at DATETIME DEFAULT CURRENT_TIMESTAMP, + updated_at DATETIME DEFAULT CURRENT_TIMESTAMP +); +``` + +The `updated_at` timestamp is automatically updated when an item is modified. + +## Error Handling + +The API returns appropriate HTTP status codes: + +- `200` - Success +- `201` - Created +- `204` - No Content (successful deletion) +- `400` - Bad Request (validation errors) +- `404` - Not Found +- `500` - Internal Server Error + +Error responses follow this format: + +```json +{ + "error": "Error message" +} +``` + +## Development + +### TypeScript Compilation + +Watch mode for automatic compilation: + +```bash +npm run watch +``` + +### Project Structure + +The codebase follows a layered architecture: + 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src/main.ts", + "watch": "tsc --watch" + }, + "keywords": [ + "express", + "typescript", + "crud", + "backend" + ], + "author": "", + "license": "ISC", + "dependencies": { + "express": "^4.18.2", + "better-sqlite3": "^9.2.2", + "cors": "^2.8.5" + }, + "devDependencies": { + "@types/express": "^4.17.21", + "@types/cors": "^2.8.17", + "@types/better-sqlite3": "^7.6.8", + "@types/node": "^20.10.6", + "typescript": "^5.3.3", + "ts-node-dev": "^2.0.0" + } +} diff --git a/src/problem5/src/controllers/itemController.ts b/src/problem5/src/controllers/itemController.ts new file mode 100644 index 000000000..d8982af5a --- /dev/null +++ b/src/problem5/src/controllers/itemController.ts @@ -0,0 +1,117 @@ +import { Request, Response } from 'express'; +import { ItemModel } from '../models/itemModel'; +import { CreateItemDto, UpdateItemDto, ItemFilters, Item } from '../types/item'; + +export class ItemController { + static create(req: Request, res: Response): void { + try { + const data: CreateItemDto = req.body; + + if (!data.name || data.name.trim() === '') { + res.status(400).json({ error: 'Name is required' }); + return; + } + + const item = ItemModel.create(data); + res.status(201).json(item); + } catch (error) { + console.error('Error creating item:', error); + res.status(500).json({ error: 'Failed to create item' }); + } + } + + static list(req: Request, res: Response): void { + try { + const filters: ItemFilters = { + status: req.query.status as string, + search: req.query.search as string, + limit: req.query.limit + ? parseInt(req.query.limit as string) + : undefined, + offset: req.query.offset + ? parseInt(req.query.offset as string) + : undefined, + }; + + const items = ItemModel.findAll(filters); + res.json(items); + } catch (error) { + res.status(500).json({ error: 'Failed to fetch items' }); + } + } + + static getById(req: Request, res: Response): void { + try { + const id = req.params.id; + + if (!id || !ItemController.isValidUUID(id)) { + res.status(400).json({ error: 'Invalid ID format' }); + return; + } + + const item = ItemModel.findById(id); + + if (!item) { + res.status(404).json({ error: 'Item not found' }); + return; + } + + res.json(item); + } catch (error) { + res.status(500).json({ error: 'Failed to fetch item' }); + } + } + + static update(req: Request, res: Response): void { + try { + const id = req.params.id; + console.log('Updating item with ID:', id); + + if (!id || !ItemController.isValidUUID(id)) { + res.status(400).json({ error: 'Invalid ID format' }); + return; + } + + const data: UpdateItemDto = req.body; + const item = ItemModel.update(id, data); + + if (!item) { + res.status(404).json({ error: 'Item not found' }); + return; + } + + res.json(item); + } catch (error) { + console.error('Error updating item:', error); + res.status(500).json({ error: 'Failed to update item' }); + } + } + + static delete(req: Request, res: Response): void { + try { + const id = req.params.id; + + if (!id || !ItemController.isValidUUID(id)) { + res.status(400).json({ error: 'Invalid ID format' }); + return; + } + + const deleted = ItemModel.delete(id); + + if (!deleted) { + res.status(404).json({ error: 'Item not found' }); + return; + } + + res.status(204).send(); + } catch (error) { + res.status(500).json({ error: 'Failed to delete item' }); + } + } + + private static isValidUUID(uuid: string): boolean { + const uuidRegex = + /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i; + return uuidRegex.test(uuid); + } +} diff --git a/src/problem5/src/database/db.ts b/src/problem5/src/database/db.ts new file mode 100644 index 000000000..ad57e7956 --- /dev/null +++ b/src/problem5/src/database/db.ts @@ -0,0 +1,27 @@ +import Database, { type Database as DatabaseType } from 'better-sqlite3'; +import path from 'path'; + +const dbPath = path.join(__dirname, '../../data.db'); +console.log(`Database location: ${dbPath}`); +const db: DatabaseType = new Database(dbPath); + +db.exec(` + CREATE TABLE IF NOT EXISTS items ( + id TEXT PRIMARY KEY, + name TEXT NOT NULL, + description TEXT, + status TEXT DEFAULT 'active', + created_at DATETIME DEFAULT CURRENT_TIMESTAMP, + updated_at DATETIME DEFAULT CURRENT_TIMESTAMP + ) +`); + +db.exec(` + CREATE TRIGGER IF NOT EXISTS update_items_timestamp + AFTER UPDATE ON items + BEGIN + UPDATE items SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id; + END +`); + +export default db; diff --git a/src/problem5/src/main.ts b/src/problem5/src/main.ts new file mode 100644 index 000000000..211e62419 --- /dev/null +++ b/src/problem5/src/main.ts @@ -0,0 +1,37 @@ +import express, { Request, Response } from 'express'; +import cors from 'cors'; +import itemRoutes from './routes/itemRoutes'; + +const app = express(); +const PORT = process.env.PORT || 3000; + +// Middleware +app.use(cors()); +app.use(express.json()); +app.use(express.urlencoded({ extended: true })); + +// Routes +app.use('/api/items', itemRoutes); + +// Health check +app.get('/health', (req: Request, res: Response) => { + res.json({ status: 'ok', message: 'Server is running' }); +}); + +// 404 handler +app.use((req: Request, res: Response) => { + res.status(404).json({ error: 'Route not found' }); +}); + +// Error handler +app.use((err: Error, req: Request, res: Response, next: any) => { + console.error(err.stack); + res.status(500).json({ error: 'Internal server error' }); +}); + +app.listen(PORT, () => { + console.log(`🚀 Server is running on http://localhost:${PORT}`); + console.log( + `📝 API endpoints available at http://localhost:${PORT}/api/items` + ); +}); diff --git a/src/problem5/src/models/itemModel.ts b/src/problem5/src/models/itemModel.ts new file mode 100644 index 000000000..7fa078d9b --- /dev/null +++ b/src/problem5/src/models/itemModel.ts @@ -0,0 +1,99 @@ +import { randomUUID } from 'crypto'; +import db from '../database/db'; +import { Item, CreateItemDto, UpdateItemDto, ItemFilters } from '../types/item'; + +export class ItemModel { + static create(data: CreateItemDto): Item { + const id = randomUUID(); + const stmt = db.prepare(` + INSERT INTO items (id, name, description, status) + VALUES (?, ?, ?, ?) + `); + + stmt.run( + id, + data.name, + data.description || null, + data.status || 'active' + ); + + return this.findById(id)!; + } + + static findById(id: string): Item | null { + const stmt = db.prepare('SELECT * FROM items WHERE id = ?'); + const row = stmt.get(id) as Item | undefined; + return row || null; + } + + static findAll(filters: ItemFilters = {}): Item[] { + let query = 'SELECT * FROM items WHERE 1=1'; + const params: any[] = []; + + if (filters.status) { + query += ' AND status = ?'; + params.push(filters.status); + } + + if (filters.search) { + query += ' AND (name LIKE ? OR description LIKE ?)'; + const searchTerm = `%${filters.search}%`; + params.push(searchTerm, searchTerm); + } + + query += ' ORDER BY created_at DESC'; + + if (filters.limit) { + query += ' LIMIT ?'; + params.push(filters.limit); + } + + if (filters.offset) { + query += ' OFFSET ?'; + params.push(filters.offset); + } + + const stmt = db.prepare(query); + return stmt.all(...params) as Item[]; + } + + static update(id: string, data: UpdateItemDto): Item | null { + const existing = this.findById(id); + if (!existing) return null; + + const updates: string[] = []; + const params: any[] = []; + + if (data.name !== undefined) { + updates.push('name = ?'); + params.push(data.name); + } + if (data.description !== undefined) { + updates.push('description = ?'); + params.push(data.description); + } + if (data.status !== undefined) { + updates.push('status = ?'); + params.push(data.status); + } + + if (updates.length === 0) return existing; + + params.push(id); + const stmt = db.prepare(` + UPDATE items + SET ${updates.join(', ')} + WHERE id = ? + `); + + stmt.run(...params); + return this.findById(id); + } + + static delete(id: string): boolean { + const stmt = db.prepare('DELETE FROM items WHERE id = ?'); + const result = stmt.run(id); + return result.changes > 0; + } +} + diff --git a/src/problem5/src/routes/itemRoutes.ts b/src/problem5/src/routes/itemRoutes.ts new file mode 100644 index 000000000..50efd8ea7 --- /dev/null +++ b/src/problem5/src/routes/itemRoutes.ts @@ -0,0 +1,13 @@ +import { Router } from 'express'; +import { ItemController } from '../controllers/itemController'; + +const router = Router(); + +router.post('/', ItemController.create); +router.get('/', ItemController.list); +router.get('/:id', ItemController.getById); +router.put('/:id', ItemController.update); +router.delete('/:id', ItemController.delete); + +export default router; + diff --git a/src/problem5/src/types/item.ts b/src/problem5/src/types/item.ts new file mode 100644 index 000000000..f5b3d61f9 --- /dev/null +++ b/src/problem5/src/types/item.ts @@ -0,0 +1,28 @@ +export interface Item { + id: string; + name: string; + description?: string; + status: string; + created_at: string; + updated_at: string; +} + +export interface CreateItemDto { + name: string; + description?: string; + status?: string; +} + +export interface UpdateItemDto { + name?: string; + description?: string; + status?: string; +} + +export interface ItemFilters { + status?: string; + search?: string; + limit?: number; + offset?: number; +} + diff --git a/src/problem5/tsconfig.json b/src/problem5/tsconfig.json new file mode 100644 index 000000000..bbce4fff2 --- /dev/null +++ b/src/problem5/tsconfig.json @@ -0,0 +1,21 @@ +{ + "compilerOptions": { + "target": "ES2020", + "module": "commonjs", + "lib": ["ES2020"], + "outDir": "./dist", + "rootDir": "./src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "resolveJsonModule": true, + "moduleResolution": "node", + "declaration": true, + "declarationMap": true, + "sourceMap": true + }, + "include": ["src/**/*"], + "exclude": ["node_modules", "dist"] +} + diff --git a/src/problem6/.gitignore b/src/problem6/.gitignore new file mode 100644 index 000000000..3760f7650 --- /dev/null +++ b/src/problem6/.gitignore @@ -0,0 +1,7 @@ +node_modules/ +dist/ +data.db +.env +*.log +.DS_Store + diff --git a/src/problem6/README.md b/src/problem6/README.md new file mode 100644 index 000000000..b3ca38f6d --- /dev/null +++ b/src/problem6/README.md @@ -0,0 +1,857 @@ +# Problem 6 - Live Scoreboard API Service + +A real-time scoreboard API service built with Express.js, TypeScript, and WebSocket support. This module provides secure score management with JWT authentication and live updates for displaying top 10 user scores. + +## Table of Contents + +- [Overview](#overview) +- [Features](#features) +- [Tech Stack](#tech-stack) +- [Architecture](#architecture) +- [API Specification](#api-specification) +- [Database Schema](#database-schema) +- [Authentication](#authentication) +- [Live Updates](#live-updates) +- [Execution Flow](#execution-flow) +- [Installation](#installation) +- [Configuration](#configuration) +- [Usage Examples](#usage-examples) +- [Security Considerations](#security-considerations) +- [Future Improvements](#future-improvements) + +## Overview + +This module provides a backend API service for managing user scores in a real-time scoreboard system. The service ensures that only authenticated users can update their scores and broadcasts scoreboard changes to all connected clients in real-time. + +### Key Requirements + +1. ✅ Display top 10 user scores +2. ✅ Real-time live updates via WebSocket +3. ✅ Secure score updates with JWT authentication +4. ✅ Prevent unauthorized score manipulation +5. ✅ RESTful API endpoints for scoreboard operations + +## Features + +- **JWT Authentication** - Secure token-based authentication for score updates +- **Real-time Updates** - WebSocket support for live scoreboard updates +- **Top 10 Leaderboard** - Efficient querying of top scores +- **Score Validation** - Prevents negative scores and validates score increments +- **User Management** - User registration and authentication +- **Database Persistence** - SQLite database for data storage +- **Type Safety** - Full TypeScript support + +## Tech Stack + +- **Express.js** - Web framework for REST API +- **TypeScript** - Type-safe JavaScript +- **JWT (jsonwebtoken)** - Token-based authentication +- **WebSocket (ws)** - Real-time bidirectional communication +- **SQLite (better-sqlite3)** - Lightweight database +- **bcrypt** - Password hashing +- **CORS** - Cross-origin resource sharing + +## Architecture + +### Project Structure + +``` +src/problem6/ +├── src/ +│ ├── main.ts # Application entry point +│ ├── database/ +│ │ └── db.ts # Database connection and schema +│ ├── types/ +│ │ ├── user.ts # User type definitions +│ │ └── score.ts # Score type definitions +│ ├── models/ +│ │ ├── userModel.ts # User data access layer +│ │ └── scoreModel.ts # Score data access layer +│ ├── controllers/ +│ │ ├── authController.ts # Authentication logic +│ │ ├── scoreController.ts # Score update logic +│ │ └── scoreboardController.ts # Scoreboard retrieval logic +│ ├── routes/ +│ │ ├── authRoutes.ts # Authentication routes +│ │ ├── scoreRoutes.ts # Score update routes +│ │ └── scoreboardRoutes.ts # Scoreboard routes +│ ├── middleware/ +│ │ ├── authMiddleware.ts # JWT authentication middleware +│ │ └── validationMiddleware.ts # Request validation +│ └── websocket/ +│ └── websocketServer.ts # WebSocket server for live updates +├── package.json +├── tsconfig.json +└── README.md +``` + +### System Architecture + +``` +┌─────────────┐ +│ Client │ +│ (Browser) │ +└──────┬──────┘ + │ + ├─────────────────────────────────┐ + │ │ + ▼ ▼ +┌──────────────┐ ┌──────────────┐ +│ REST API │ │ WebSocket │ +│ (Express) │ │ Server │ +└──────┬───────┘ └──────┬──────┘ + │ │ + ├───────────────┬───────────────┤ + │ │ │ + ▼ ▼ ▼ +┌─────────────┐ ┌─────────────┐ ┌─────────────┐ +│ Auth │ │ Score │ │ Scoreboard │ +│ Controller │ │ Controller │ │ Controller │ +└──────┬──────┘ └──────┬──────┘ └──────┬──────┘ + │ │ │ + └───────┬───────┴───────┬───────┘ + │ │ + ▼ ▼ + ┌───────────────┐ ┌───────────────┐ + │ User Model │ │ Score Model │ + └───────┬───────┘ └───────┬───────┘ + │ │ + └────────┬────────┘ + │ + ▼ + ┌─────────────────┐ + │ SQLite Database│ + │ (data.db) │ + └─────────────────┘ +``` + +## API Specification + +### Base URL + +``` +http://localhost:3000 +``` + +### Authentication Endpoints + +#### 1. Register User + +**POST** `/api/auth/register` + +Creates a new user account. + +Request Body: + +```json +{ + "username": "player1", + "password": "123456@", + "email": "player1@example.com" +} +``` + +Response: `201 Created` + +```json +{ + "message": "User registered successfully", + "userId": "user-uuid" +} +``` + +Error Responses: + +- `400 Bad Request` - Validation error (missing fields, invalid email, etc.) +- `409 Conflict` - Username or email already exists + +#### 2. Login + +**POST** `/api/auth/login` + +Authenticates a user and returns a JWT token. + +Request Body: + +```json +{ + "username": "player1", + "password": "123456@" +} +``` + +Response: `200 OK` + +```json +{ + "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...", + "user": { + "id": "user-uuid", + "username": "player1", + "email": "player1@example.com" + } +} +``` + +Error Responses: + +- `400 Bad Request` - Missing username or password +- `401 Unauthorized` - Invalid credentials + +### Scoreboard Endpoints + +#### 3. Get Top 10 Scores + +**GET** `/api/scoreboard/top` + +Retrieves the top 10 users by score. + +Response: `200 OK` + +```json +{ + "scores": [ + { + "userId": "user-uuid-1", + "username": "player1", + "score": 1500, + "rank": 1, + "updatedAt": "2024-01-15T10:30:00Z" + }, + { + "userId": "user-uuid-2", + "username": "player2", + "score": 1200, + "rank": 2, + "updatedAt": "2024-01-15T10:25:00Z" + } + // ... up to 10 entries + ], + "totalPlayers": 150 +} +``` + +#### 4. Get User's Current Score + +**GET** `/api/scoreboard/user/:userId` + +Retrieves a specific user's score and rank. + +Response: `200 OK` + +```json +{ + "userId": "user-uuid", + "username": "player1", + "score": 1500, + "rank": 1, + "updatedAt": "2024-01-15T10:30:00Z" +} +``` + +Error Response: + +- `404 Not Found` - User not found + +### Score Update Endpoints + +#### 5. Update Score + +**POST** `/api/scores/update` + +Increments the user's score. Requires JWT authentication. + +**Headers:** + +``` +Authorization: Bearer +``` + +Request Body: + +```json +{ + "increment": 10 +} +``` + +Response: `200 OK` + +```json +{ + "message": "Score updated successfully", + "userId": "user-uuid", + "previousScore": 1490, + "newScore": 1500, + "rank": 1 +} +``` + +Error Responses: + +- `400 Bad Request` - Invalid increment value (must be positive) +- `401 Unauthorized` - Missing or invalid JWT token +- `500 Internal Server Error` - Database error + +### WebSocket Endpoint + +#### 6. Live Scoreboard Updates + +**WebSocket** `ws://localhost:3000/ws/scoreboard` + +Connects to the WebSocket server to receive real-time scoreboard updates. + +**Connection:** + +```javascript +const ws = new WebSocket('ws://localhost:3000/ws/scoreboard'); +``` + +**Messages Received:** + +```json +{ + "type": "scoreboard_update", + "data": { + "scores": [ + { + "userId": "user-uuid-1", + "username": "player1", + "score": 1500, + "rank": 1 + } + // ... top 10 scores + ], + "updatedAt": "2024-01-15T10:30:00Z" + } +} +``` + +**Message Types:** + +- `scoreboard_update` - Broadcasted when any score changes +- `connection_established` - Sent when client connects +- `error` - Error messages + +### Health Check + +**GET** `/health` + +Response: `200 OK` + +```json +{ + "status": "ok", + "message": "Server is running", + "timestamp": "2024-01-15T10:30:00Z" +} +``` + +## Database Schema + +### Users Table + +```sql +CREATE TABLE users ( + id TEXT PRIMARY KEY, + username TEXT UNIQUE NOT NULL, + email TEXT UNIQUE NOT NULL, + password_hash TEXT NOT NULL, + created_at DATETIME DEFAULT CURRENT_TIMESTAMP, + updated_at DATETIME DEFAULT CURRENT_TIMESTAMP +); +``` + +### Scores Table + +```sql +CREATE TABLE scores ( + id TEXT PRIMARY KEY, + user_id TEXT NOT NULL, + score INTEGER NOT NULL DEFAULT 0, + updated_at DATETIME DEFAULT CURRENT_TIMESTAMP, + FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE, + UNIQUE(user_id) +); + +CREATE INDEX idx_scores_score ON scores(score DESC); +CREATE INDEX idx_scores_user_id ON scores(user_id); +``` + +## Authentication + +### JWT Token Structure + +The JWT token contains: + +```json +{ + "userId": "user-uuid", + "username": "player1", + "iat": 1705312800, + "exp": 1705316400 +} +``` + +### Token Expiration + +- Default expiration: 24 hours +- Configurable via `JWT_EXPIRES_IN` environment variable + +### Authentication Flow + +1. User registers or logs in +2. Server validates credentials +3. Server generates JWT token with user information +4. Client stores token (localStorage, sessionStorage, or cookie) +5. Client includes token in `Authorization` header for protected endpoints +6. Server validates token on each request +7. Server extracts user information from token + +## Live Updates + +### WebSocket Implementation + +The WebSocket server broadcasts scoreboard updates to all connected clients whenever: + +- A user's score is updated +- The top 10 leaderboard changes + +### Connection Management + +- Clients automatically reconnect on disconnect +- Server maintains a list of active connections +- Broadcasts are sent to all connected clients simultaneously + +### Message Format + +All WebSocket messages follow this structure: + +```json +{ + "type": "message_type", + "data": { + /* message-specific data */ + }, + "timestamp": "ISO-8601 timestamp" +} +``` + +## Execution Flow + +### Score Update Flow + +```mermaid +sequenceDiagram + participant Client + participant API + participant Auth + participant DB + participant WS + + Client->>API: POST /api/scores/update
(JWT Token + increment) + API->>Auth: Verify JWT Token + Auth-->>API: Token Valid (userId) + + API->>DB: Get Current Score (userId) + DB-->>API: Current Score + + API->>DB: Update Score (userId, newScore) + DB-->>API: Updated Score + Rank + + API->>DB: Get Top 10 Scores + DB-->>API: Top 10 Leaderboard + + API->>WS: Broadcast Scoreboard Update + WS->>Client: WebSocket Message (All Clients) + + API-->>Client: 200 OK (New Score + Rank) +``` + +### Authentication Flow + +```mermaid +sequenceDiagram + participant Client + participant API + participant Auth + participant DB + + Client->>API: POST /api/auth/login
(username, password) + API->>DB: Find User by Username + DB-->>API: User Record + + API->>Auth: Verify Password Hash + Auth-->>API: Password Valid + + API->>Auth: Generate JWT Token + Auth-->>API: JWT Token + + API-->>Client: 200 OK (Token + User Info) +``` + +### Scoreboard Retrieval Flow + +```mermaid +sequenceDiagram + participant Client + participant API + participant DB + + Client->>API: GET /api/scoreboard/top + API->>DB: Query Top 10 Scores
(ORDER BY score DESC LIMIT 10) + DB-->>API: Top 10 Scores with User Info + API-->>Client: 200 OK (Scoreboard Data) +``` + +### WebSocket Connection Flow + +```mermaid +sequenceDiagram + participant Client + participant WS + participant DB + + Client->>WS: WebSocket Connection Request + WS->>DB: Get Current Top 10 Scores + DB-->>WS: Top 10 Scores + WS-->>Client: Connection Established
(Initial Scoreboard) + + Note over WS,DB: When Score Updates... + DB->>WS: Score Changed Event + WS->>DB: Get Updated Top 10 + DB-->>WS: Updated Scoreboard + WS->>Client: Broadcast Update (All Clients) +``` + +## Installation + +### Prerequisites + +- Node.js (v16 or higher) +- npm or yarn + +### Steps + +1. Navigate to the problem6 directory: + +```bash +cd src/problem6 +``` + +2. Install dependencies: + +```bash +npm install +``` + +3. Build the TypeScript code: + +```bash +npm run build +``` + +4. Start the server: + +```bash +npm start +``` + +For development with auto-reload: + +```bash +npm run dev +``` + +## Configuration + +### Environment Variables + +Create a `.env` file in the project root: + +```env +# Server Configuration +PORT=3000 + +# JWT Configuration +JWT_SECRET=secret-jwt-key +JWT_EXPIRES_IN=24h + +# Database Configuration +DB_PATH=./data.db + +# CORS Configuration +CORS_ORIGIN=http://localhost:3000,http://localhost:5173 +``` + +### Default Values + +- **Port**: 3000 +- **JWT Secret**: Must be set via environment variable (no default for security) +- **JWT Expiration**: 24 hours +- **Database**: `data.db` in project root + +## Testing WebSocket Connection + +### Method 1: Browser Test Page (Easiest) 🌐 + +**⚠️ Important:** Browsers block WebSocket connections from `file://` URLs. You must access the page through HTTP. + +1. Start the server: + +```bash +npm run dev +``` + +2. Open the test page in your browser: + + - **Go to:** `http://localhost:3000/test` + - Or directly: `http://localhost:3000/test-websocket.html` + +3. Click the "Connect" button to establish WebSocket connection + +4. You'll see: + + - Connection status + - Live scoreboard updates + - All WebSocket messages in real-time + +5. To test live updates: + - Open another terminal + - Update a score using the API (see examples below) + - Watch the scoreboard update automatically in the browser! + +## Usage Examples + +### Register a New User + +```bash +curl -X POST http://localhost:3000/api/auth/register \ + -H "Content-Type: application/json" \ + -d '{ + "username": "player1", + "password": "123456@", + "email": "player1@example.com" + }' +``` + +### Login and Get Token + +```bash +curl -X POST http://localhost:3000/api/auth/login \ + -H "Content-Type: application/json" \ + -d '{ + "username": "player1", + "password": "123456@" + }' +``` + +### Update Score (with JWT) + +```bash +TOKEN="your-jwt-token-here" + +curl -X POST http://localhost:3000/api/scores/update \ + -H "Content-Type: application/json" \ + -H "Authorization: Bearer $TOKEN" \ + -d '{ + "increment": 10 + }' +``` + +### Get Top 10 Scoreboard + +```bash +curl http://localhost:3000/api/scoreboard/top +``` + +### WebSocket Connection (JavaScript) + +```javascript +const ws = new WebSocket('ws://localhost:3000/ws/scoreboard'); + +ws.onopen = () => { + console.log('Connected to scoreboard'); +}; + +ws.onmessage = (event) => { + const message = JSON.parse(event.data); + if (message.type === 'scoreboard_update') { + console.log('Scoreboard updated:', message.data); + // Update UI with new scoreboard + } +}; + +ws.onerror = (error) => { + console.error('WebSocket error:', error); +}; + +ws.onclose = () => { + console.log('Disconnected from scoreboard'); +}; +``` + +## Security Considerations + +### Implemented Security Measures + +1. **JWT Authentication** - All score updates require valid JWT tokens +2. **Password Hashing** - Passwords are hashed using bcrypt (salt rounds: 10) +3. **Input Validation** - All inputs are validated before processing +4. **SQL Injection Prevention** - Using parameterized queries +5. **CORS Configuration** - Restricted to allowed origins +6. **Token Expiration** - JWT tokens expire after configured time + +### Security Best Practices + +- ✅ Passwords are never stored in plain text +- ✅ JWT tokens include expiration +- ✅ Score increments are validated (must be positive) +- ✅ User can only update their own score (via JWT userId) +- ✅ Database uses foreign key constraints + +### Additional Security Recommendations + +1. **Rate Limiting** - Implement rate limiting to prevent abuse: + + - Limit score updates per user per time period + - Limit login attempts per IP + - Limit registration attempts + +2. **HTTPS/WSS** - Use secure connections in production: + + - HTTPS for REST API + - WSS for WebSocket connections + +3. **Token Refresh** - Implement refresh token mechanism for better security + +4. **Input Sanitization** - Additional input sanitization for XSS prevention + +5. **Audit Logging** - Log all score updates for audit purposes + +6. **IP Whitelisting** - Optional IP whitelisting for admin endpoints + +## Future Improvements + +### High Priority 🔴 + +1. **Rate Limiting** + + - Implement rate limiting middleware (e.g., express-rate-limit) + - Limit score updates to prevent abuse + - Example: Max 100 score updates per user per hour + +2. **Score Update Validation** + + - Add maximum increment limit per request + - Implement cooldown period between updates + - Validate score increments are reasonable + +3. **Error Handling Enhancement** + + - More detailed error messages + - Error logging to file/system + - Error tracking (e.g., Sentry integration) + +4. **Database Optimization** + - Add database connection pooling + - Implement caching layer (Redis) for top 10 scores + - Add database indexes for better query performance + +### Medium Priority 🟡 + +5. **User Profile Management** + + - Allow users to update their profile + - Add user avatar/profile picture support + - User statistics (total games played, best score, etc.) + +6. **Advanced Scoreboard Features** + + - Pagination for scoreboard (beyond top 10) + - Filter by time period (daily, weekly, monthly leaderboards) + - Historical scoreboard snapshots + +7. **WebSocket Enhancements** + + - Room-based connections (separate scoreboards per game) + - Private messaging between users + - Connection authentication for WebSocket + +8. **Testing** + - Unit tests for controllers and models + - Integration tests for API endpoints + - WebSocket connection tests + - Load testing for concurrent updates + +### Low Priority 🟢 + +9. **Admin Dashboard** + + - Admin authentication and authorization + - Admin panel for user management + - Score moderation capabilities + - System statistics and monitoring + +10. **Analytics** + + - Track score update frequency + - User engagement metrics + - Score distribution analysis + +11. **Notification System** + + - Email notifications for rank changes + - Push notifications for mobile apps + - Achievement system (badges, milestones) + +12. **API Versioning** + + - Version API endpoints (e.g., `/api/v1/scoreboard`) + - Support multiple API versions simultaneously + +13. **Documentation** + + - OpenAPI/Swagger documentation + - Postman collection + - API usage examples in multiple languages + +14. **Deployment** + + - Docker containerization + - Kubernetes deployment configuration + - CI/CD pipeline setup + - Environment-specific configurations + +15. **Monitoring & Observability** + - Health check endpoints with detailed metrics + - Application performance monitoring (APM) + - Log aggregation (e.g., ELK stack) + - Real-time dashboards + +### Technical Debt + +16. **Code Quality** + + - Add ESLint and Prettier configuration + - Implement code formatting in CI/CD + - Increase test coverage to >80% + +17. **Type Safety** + + - Stricter TypeScript configuration + - Runtime type validation (e.g., Zod) + - Better error type definitions + +18. **Database Migration** + - Migration system for schema changes + - Database versioning + - Rollback capabilities + +## Notes + +- The database file (`data.db`) should be added to `.gitignore` +- JWT secret must 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"jsonwebtoken": "^9.0.2", + "bcrypt": "^5.1.1", + "ws": "^8.16.0", + "dotenv": "^16.3.1", + "uuid": "^9.0.1" + }, + "devDependencies": { + "@types/express": "^4.17.21", + "@types/cors": "^2.8.17", + "@types/better-sqlite3": "^7.6.8", + "@types/node": "^20.10.6", + "@types/jsonwebtoken": "^9.0.5", + "@types/bcrypt": "^5.0.2", + "@types/ws": "^8.5.10", + "@types/uuid": "^9.0.7", + "typescript": "^5.3.3", + "ts-node-dev": "^2.0.0" + } +} + diff --git a/src/problem6/src/controllers/authController.ts b/src/problem6/src/controllers/authController.ts new file mode 100644 index 000000000..351453e63 --- /dev/null +++ b/src/problem6/src/controllers/authController.ts @@ -0,0 +1,90 @@ +import { Request, Response } from 'express'; +import bcrypt from 'bcrypt'; +import jwt from 'jsonwebtoken'; +import { UserModel } from '../models/userModel'; +import { RegisterRequest, LoginRequest, LoginResponse } from '../types/user'; + +export class AuthController { + static async register(req: Request, res: Response): Promise { + try { + const { username, password, email }: RegisterRequest = req.body; + + const existingUser = UserModel.findByUsername(username); + if (existingUser) { + res.status(409).json({ error: 'Username already exists' }); + return; + } + + const existingEmail = UserModel.findByEmail(email); + if (existingEmail) { + res.status(409).json({ error: 'Email already exists' }); + return; + } + + const saltRounds = 10; + const passwordHash = await bcrypt.hash(password, saltRounds); + + const user = UserModel.create({ + username, + email, + passwordHash, + }); + + const { ScoreModel } = await import('../models/scoreModel'); + ScoreModel.create(user.id, 0); + + res.status(201).json({ + message: 'User registered successfully', + userId: user.id, + }); + } catch (error) { + console.error('Registration error:', error); + res.status(500).json({ error: 'Internal server error' }); + } + } + + static async login(req: Request, res: Response): Promise { + try { + const { username, password }: LoginRequest = req.body; + + const user = UserModel.findByUsername(username); + if (!user) { + res.status(401).json({ error: 'Invalid credentials' }); + return; + } + + const isValidPassword = await bcrypt.compare(password, user.passwordHash); + if (!isValidPassword) { + res.status(401).json({ error: 'Invalid credentials' }); + return; + } + + const jwtSecret = process.env.JWT_SECRET; + if (!jwtSecret) { + console.error('JWT_SECRET is not set in environment variables'); + res.status(500).json({ error: 'Server configuration error' }); + return; + } + + const expiresIn = process.env.JWT_EXPIRES_IN || '24h'; + const token = jwt.sign( + { + userId: user.id, + username: user.username, + }, + jwtSecret, + { expiresIn } + ); + + const response: LoginResponse = { + token, + user: UserModel.toPublic(user), + }; + + res.json(response); + } catch (error) { + console.error('Login error:', error); + res.status(500).json({ error: 'Internal server error' }); + } + } +} diff --git a/src/problem6/src/controllers/scoreController.ts b/src/problem6/src/controllers/scoreController.ts new file mode 100644 index 000000000..3da5ecb0e --- /dev/null +++ b/src/problem6/src/controllers/scoreController.ts @@ -0,0 +1,41 @@ +import { Request, Response } from 'express'; +import { ScoreModel } from '../models/scoreModel'; +import { ScoreUpdateResponse } from '../types/score'; +import { broadcastScoreboardUpdate } from '../websocket/websocketServer'; + +export class ScoreController { + static async updateScore(req: Request, res: Response): Promise { + try { + const userId = req.user?.userId; + if (!userId) { + res.status(401).json({ error: 'User not authenticated' }); + return; + } + + const { increment } = req.body; + + const currentScore = ScoreModel.findByUserId(userId); + const previousScore = currentScore ? currentScore.score : 0; + + const updatedScore = ScoreModel.updateScore(userId, increment); + const newScore = updatedScore.score; + + const rank = ScoreModel.getUserRank(userId) || 0; + + const response: ScoreUpdateResponse = { + message: 'Score updated successfully', + userId, + previousScore, + newScore, + rank, + }; + + broadcastScoreboardUpdate(); + + res.json(response); + } catch (error) { + console.error('Score update error:', error); + res.status(500).json({ error: 'Internal server error' }); + } + } +} diff --git a/src/problem6/src/controllers/scoreboardController.ts b/src/problem6/src/controllers/scoreboardController.ts new file mode 100644 index 000000000..04d4323cf --- /dev/null +++ b/src/problem6/src/controllers/scoreboardController.ts @@ -0,0 +1,39 @@ +import { Request, Response } from 'express'; +import { ScoreModel } from '../models/scoreModel'; +import { ScoreboardResponse } from '../types/score'; + +export class ScoreboardController { + static getTopScores(req: Request, res: Response): void { + try { + const topScores = ScoreModel.getTopScores(10); + const totalPlayers = ScoreModel.getTotalPlayers(); + + const response: ScoreboardResponse = { + scores: topScores, + totalPlayers, + }; + + res.json(response); + } catch (error) { + console.error('Get top scores error:', error); + res.status(500).json({ error: 'Internal server error' }); + } + } + + static getUserScore(req: Request, res: Response): void { + try { + const { userId } = req.params; + + const userScore = ScoreModel.getUserScoreWithRank(userId); + if (!userScore) { + res.status(404).json({ error: 'User score not found' }); + return; + } + + res.json(userScore); + } catch (error) { + console.error('Get user score error:', error); + res.status(500).json({ error: 'Internal server error' }); + } + } +} diff --git a/src/problem6/src/database/db.ts b/src/problem6/src/database/db.ts new file mode 100644 index 000000000..d119fa318 --- /dev/null +++ b/src/problem6/src/database/db.ts @@ -0,0 +1,54 @@ +import Database, { type Database as DatabaseType } from 'better-sqlite3'; +import path from 'path'; + +const dbPath = path.join(__dirname, '../../data.db'); +console.log(`Database location: ${dbPath}`); +const db: DatabaseType = new Database(dbPath); + +db.pragma('foreign_keys = ON'); + +db.exec(` + CREATE TABLE IF NOT EXISTS users ( + id TEXT PRIMARY KEY, + username TEXT UNIQUE NOT NULL, + email TEXT UNIQUE NOT NULL, + password_hash TEXT NOT NULL, + created_at DATETIME DEFAULT CURRENT_TIMESTAMP, + updated_at DATETIME DEFAULT CURRENT_TIMESTAMP + ) +`); + +db.exec(` + CREATE TABLE IF NOT EXISTS scores ( + id TEXT PRIMARY KEY, + user_id TEXT NOT NULL, + score INTEGER NOT NULL DEFAULT 0, + updated_at DATETIME DEFAULT CURRENT_TIMESTAMP, + FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE, + UNIQUE(user_id) + ) +`); + +// Create indexes for better query performance +db.exec(` + CREATE INDEX IF NOT EXISTS idx_scores_score ON scores(score DESC); + CREATE INDEX IF NOT EXISTS idx_scores_user_id ON scores(user_id); +`); + +db.exec(` + CREATE TRIGGER IF NOT EXISTS update_users_timestamp + AFTER UPDATE ON users + BEGIN + UPDATE users SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id; + END +`); + +db.exec(` + CREATE TRIGGER IF NOT EXISTS update_scores_timestamp + AFTER UPDATE ON scores + BEGIN + UPDATE scores SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id; + END +`); + +export default db; diff --git a/src/problem6/src/main.ts b/src/problem6/src/main.ts new file mode 100644 index 000000000..910b9356c --- /dev/null +++ b/src/problem6/src/main.ts @@ -0,0 +1,75 @@ +import express, { Request, Response } from 'express'; +import cors from 'cors'; +import http from 'http'; +import dotenv from 'dotenv'; +import path from 'path'; +import authRoutes from './routes/authRoutes'; +import scoreRoutes from './routes/scoreRoutes'; +import scoreboardRoutes from './routes/scoreboardRoutes'; +import { initializeWebSocket } from './websocket/websocketServer'; + +dotenv.config(); + +const app = express(); +const PORT = process.env.PORT || 3000; + +// Validate required environment variables +if (!process.env.JWT_SECRET) { + console.error('⚠️ WARNING: JWT_SECRET is not set in environment variables'); + console.error(' Please set JWT_SECRET in .env file or environment'); + console.error( + ' Using a default secret for development (NOT SECURE FOR PRODUCTION)' + ); + process.env.JWT_SECRET = 'default-dev-secret-change-in-production'; +} + +const corsOptions = { + origin: process.env.CORS_ORIGIN?.split(',') || '*', + credentials: true, +}; +app.use(cors(corsOptions)); +app.use(express.json()); +app.use(express.urlencoded({ extended: true })); + +app.use(express.static(path.join(__dirname, '..'))); + +app.get('/test', (req: Request, res: Response) => { + res.sendFile(path.join(__dirname, '../test-websocket.html')); +}); + +app.use('/api/auth', authRoutes); +app.use('/api/scores', scoreRoutes); +app.use('/api/scoreboard', scoreboardRoutes); + +app.get('/health', (req: Request, res: Response) => { + res.json({ + status: 'ok', + message: 'Server is running', + timestamp: new Date().toISOString(), + }); +}); + +app.use((req: Request, res: Response) => { + res.status(404).json({ error: 'Route not found' }); +}); + +app.use((err: Error, req: Request, res: Response, next: any) => { + console.error('Error:', err.stack); + res.status(500).json({ error: 'Internal server error' }); +}); + +const server = http.createServer(app); + +initializeWebSocket(server); + +server.listen(PORT, () => { + console.log(`🚀 Server is running on http://localhost:${PORT}`); + console.log(`📝 API endpoints available at http://localhost:${PORT}/api`); + console.log( + `🔌 WebSocket server available at ws://localhost:${PORT}/ws/scoreboard` + ); + console.log(`💚 Health check available at http://localhost:${PORT}/health`); + console.log( + `🧪 WebSocket test page available at http://localhost:${PORT}/test` + ); +}); diff --git a/src/problem6/src/middleware/authMiddleware.ts b/src/problem6/src/middleware/authMiddleware.ts new file mode 100644 index 000000000..66e9e2564 --- /dev/null +++ b/src/problem6/src/middleware/authMiddleware.ts @@ -0,0 +1,40 @@ +import { Request, Response, NextFunction } from 'express'; +import jwt from 'jsonwebtoken'; +import { JWTPayload } from '../types/user'; + +declare global { + namespace Express { + interface Request { + user?: JWTPayload; + } + } +} + +export const authenticateToken = ( + req: Request, + res: Response, + next: NextFunction +): void => { + const authHeader = req.headers['authorization']; + const token = authHeader && authHeader.split(' ')[1]; + + if (!token) { + res.status(401).json({ error: 'Authentication token required' }); + return; + } + + const jwtSecret = process.env.JWT_SECRET; + if (!jwtSecret) { + console.error('JWT_SECRET is not set in environment variables'); + res.status(500).json({ error: 'Server configuration error' }); + return; + } + + try { + const decoded = jwt.verify(token, jwtSecret) as JWTPayload; + req.user = decoded; + next(); + } catch (error) { + res.status(403).json({ error: 'Invalid or expired token' }); + } +}; diff --git a/src/problem6/src/middleware/validationMiddleware.ts b/src/problem6/src/middleware/validationMiddleware.ts new file mode 100644 index 000000000..1fc2aec87 --- /dev/null +++ b/src/problem6/src/middleware/validationMiddleware.ts @@ -0,0 +1,99 @@ +import { Request, Response, NextFunction } from 'express'; + +export const validateRegister = ( + req: Request, + res: Response, + next: NextFunction +): void => { + const { username, password, email } = req.body; + + if ( + !username || + typeof username !== 'string' || + username.trim().length === 0 + ) { + res + .status(400) + .json({ error: 'Username is required and must be a non-empty string' }); + return; + } + + if (username.length < 3 || username.length > 20) { + res + .status(400) + .json({ error: 'Username must be between 3 and 20 characters' }); + return; + } + + if (!password || typeof password !== 'string' || password.length < 6) { + res + .status(400) + .json({ + error: 'Password is required and must be at least 6 characters', + }); + return; + } + + if (!email || typeof email !== 'string') { + res.status(400).json({ error: 'Email is required' }); + return; + } + + const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/; + if (!emailRegex.test(email)) { + res.status(400).json({ error: 'Invalid email format' }); + return; + } + + next(); +}; + +export const validateLogin = ( + req: Request, + res: Response, + next: NextFunction +): void => { + const { username, password } = req.body; + + if (!username || typeof username !== 'string') { + res.status(400).json({ error: 'Username is required' }); + return; + } + + if (!password || typeof password !== 'string') { + res.status(400).json({ error: 'Password is required' }); + return; + } + + next(); +}; + +export const validateScoreUpdate = ( + req: Request, + res: Response, + next: NextFunction +): void => { + const { increment } = req.body; + + if (increment === undefined || increment === null) { + res.status(400).json({ error: 'Increment value is required' }); + return; + } + + if (typeof increment !== 'number') { + res.status(400).json({ error: 'Increment must be a number' }); + return; + } + + if (increment <= 0) { + res.status(400).json({ error: 'Increment must be a positive number' }); + return; + } + + if (increment > 1000) { + res.status(400).json({ error: 'Increment cannot exceed 1000 per request' }); + return; + } + + next(); +}; diff --git a/src/problem6/src/models/scoreModel.ts b/src/problem6/src/models/scoreModel.ts new file mode 100644 index 000000000..e00b9d9c6 --- /dev/null +++ b/src/problem6/src/models/scoreModel.ts @@ -0,0 +1,114 @@ +import db from '../database/db'; +import { Score, ScoreWithUser } from '../types/score'; +import { v4 as uuidv4 } from 'uuid'; + +export class ScoreModel { + static create(userId: string, initialScore: number = 0): Score { + const id = uuidv4(); + const stmt = db.prepare(` + INSERT INTO scores (id, user_id, score) + VALUES (?, ?, ?) + `); + + stmt.run(id, userId, initialScore); + + return this.findByUserId(userId)!; + } + + static findByUserId(userId: string): Score | null { + const stmt = db.prepare('SELECT * FROM scores WHERE user_id = ?'); + const row = stmt.get(userId) as any; + + if (!row) return null; + + return { + id: row.id, + userId: row.user_id, + score: row.score, + updatedAt: row.updated_at, + }; + } + + static updateScore(userId: string, increment: number): Score { + const currentScore = this.findByUserId(userId); + + if (!currentScore) { + return this.create(userId, increment); + } + + const newScore = currentScore.score + increment; + const stmt = db.prepare(` + UPDATE scores + SET score = ?, updated_at = CURRENT_TIMESTAMP + WHERE user_id = ? + `); + + stmt.run(newScore, userId); + + return this.findByUserId(userId)!; + } + + static getTopScores(limit: number = 10): ScoreWithUser[] { + const stmt = db.prepare(` + SELECT + s.user_id as userId, + u.username as username, + s.score as score, + s.updated_at as updatedAt, + ROW_NUMBER() OVER (ORDER BY s.score DESC) as rank + FROM scores s + INNER JOIN users u ON s.user_id = u.id + ORDER BY s.score DESC + LIMIT ? + `); + + const rows = stmt.all(limit) as any[]; + + return rows.map((row) => ({ + userId: row.userId, + username: row.username, + score: row.score, + rank: row.rank, + updatedAt: row.updatedAt, + })); + } + + static getUserRank(userId: string): number | null { + const stmt = db.prepare(` + SELECT + ROW_NUMBER() OVER (ORDER BY score DESC) as rank + FROM scores + WHERE user_id = ? + `); + + const row = stmt.get(userId) as any; + return row ? row.rank : null; + } + + static getTotalPlayers(): number { + const stmt = db.prepare('SELECT COUNT(*) as count FROM scores'); + const row = stmt.get() as any; + return row.count; + } + + static getUserScoreWithRank(userId: string): ScoreWithUser | null { + const score = this.findByUserId(userId); + if (!score) return null; + + const userStmt = db.prepare('SELECT username FROM users WHERE id = ?'); + const userRow = userStmt.get(userId) as any; + + if (!userRow) return null; + + const rank = this.getUserRank(userId); + if (rank === null) return null; + + return { + userId: score.userId, + username: userRow.username, + score: score.score, + rank: rank, + updatedAt: score.updatedAt, + }; + } +} diff --git a/src/problem6/src/models/userModel.ts b/src/problem6/src/models/userModel.ts new file mode 100644 index 000000000..91df5e4a7 --- /dev/null +++ b/src/problem6/src/models/userModel.ts @@ -0,0 +1,78 @@ +import db from '../database/db'; +import { User, UserPublic } from '../types/user'; +import { v4 as uuidv4 } from 'uuid'; + +export class UserModel { + static create(userData: { + username: string; + email: string; + passwordHash: string; + }): User { + const id = uuidv4(); + const stmt = db.prepare(` + INSERT INTO users (id, username, email, password_hash) + VALUES (?, ?, ?, ?) + `); + + stmt.run(id, userData.username, userData.email, userData.passwordHash); + + return this.findById(id)!; + } + + static findById(id: string): User | null { + const stmt = db.prepare('SELECT * FROM users WHERE id = ?'); + const row = stmt.get(id) as any; + + if (!row) return null; + + return { + id: row.id, + username: row.username, + email: row.email, + passwordHash: row.password_hash, + createdAt: row.created_at, + updatedAt: row.updated_at, + }; + } + + static findByUsername(username: string): User | null { + const stmt = db.prepare('SELECT * FROM users WHERE username = ?'); + const row = stmt.get(username) as any; + + if (!row) return null; + + return { + id: row.id, + username: row.username, + email: row.email, + passwordHash: row.password_hash, + createdAt: row.created_at, + updatedAt: row.updated_at, + }; + } + + static findByEmail(email: string): User | null { + const stmt = db.prepare('SELECT * FROM users WHERE email = ?'); + const row = stmt.get(email) as any; + + if (!row) return null; + + return { + id: row.id, + username: row.username, + email: row.email, + passwordHash: row.password_hash, + createdAt: row.created_at, + updatedAt: row.updated_at, + }; + } + + static toPublic(user: User): UserPublic { + return { + id: user.id, + username: user.username, + email: user.email, + }; + } +} + diff --git a/src/problem6/src/routes/authRoutes.ts b/src/problem6/src/routes/authRoutes.ts new file mode 100644 index 000000000..a5f96223b --- /dev/null +++ b/src/problem6/src/routes/authRoutes.ts @@ -0,0 +1,14 @@ +import { Router } from 'express'; +import { AuthController } from '../controllers/authController'; +import { + validateRegister, + validateLogin, +} from '../middleware/validationMiddleware'; + +const router = Router(); + +router.post('/register', validateRegister, AuthController.register); +router.post('/login', validateLogin, AuthController.login); + +export default router; + diff --git a/src/problem6/src/routes/scoreRoutes.ts b/src/problem6/src/routes/scoreRoutes.ts new file mode 100644 index 000000000..73d35a5d9 --- /dev/null +++ b/src/problem6/src/routes/scoreRoutes.ts @@ -0,0 +1,16 @@ +import { Router } from 'express'; +import { ScoreController } from '../controllers/scoreController'; +import { authenticateToken } from '../middleware/authMiddleware'; +import { validateScoreUpdate } from '../middleware/validationMiddleware'; + +const router = Router(); + +router.post( + '/update', + authenticateToken, + validateScoreUpdate, + ScoreController.updateScore +); + +export default router; + diff --git a/src/problem6/src/routes/scoreboardRoutes.ts b/src/problem6/src/routes/scoreboardRoutes.ts new file mode 100644 index 000000000..6faac051f --- /dev/null +++ b/src/problem6/src/routes/scoreboardRoutes.ts @@ -0,0 +1,10 @@ +import { Router } from 'express'; +import { ScoreboardController } from '../controllers/scoreboardController'; + +const router = Router(); + +router.get('/top', ScoreboardController.getTopScores); +router.get('/user/:userId', ScoreboardController.getUserScore); + +export default router; + diff --git a/src/problem6/src/types/score.ts b/src/problem6/src/types/score.ts new file mode 100644 index 000000000..bd56f7a48 --- /dev/null +++ b/src/problem6/src/types/score.ts @@ -0,0 +1,38 @@ +export interface Score { + id: string; + userId: string; + score: number; + updatedAt: string; +} + +export interface ScoreWithUser { + userId: string; + username: string; + score: number; + rank: number; + updatedAt: string; +} + +export interface ScoreUpdateRequest { + increment: number; +} + +export interface ScoreUpdateResponse { + message: string; + userId: string; + previousScore: number; + newScore: number; + rank: number; +} + +export interface ScoreboardResponse { + scores: ScoreWithUser[]; + totalPlayers: number; +} + +export interface WebSocketMessage { + type: string; + data: any; + timestamp: string; +} + diff --git a/src/problem6/src/types/user.ts b/src/problem6/src/types/user.ts new file mode 100644 index 000000000..a19fa51bd --- /dev/null +++ b/src/problem6/src/types/user.ts @@ -0,0 +1,38 @@ +export interface User { + id: string; + username: string; + email: string; + passwordHash: string; + createdAt: string; + updatedAt: string; +} + +export interface UserPublic { + id: string; + username: string; + email: string; +} + +export interface RegisterRequest { + username: string; + password: string; + email: string; +} + +export interface LoginRequest { + username: string; + password: string; +} + +export interface LoginResponse { + token: string; + user: UserPublic; +} + +export interface JWTPayload { + userId: string; + username: string; + iat?: number; + exp?: number; +} + diff --git a/src/problem6/src/websocket/websocketServer.ts b/src/problem6/src/websocket/websocketServer.ts new file mode 100644 index 000000000..7c9e91f40 --- /dev/null +++ b/src/problem6/src/websocket/websocketServer.ts @@ -0,0 +1,69 @@ +import { WebSocketServer, WebSocket } from 'ws'; +import { Server } from 'http'; +import { ScoreModel } from '../models/scoreModel'; +import { WebSocketMessage } from '../types/score'; + +let wss: WebSocketServer | null = null; + +export const initializeWebSocket = (server: Server): void => { + wss = new WebSocketServer({ server, path: '/ws/scoreboard' }); + + wss.on('connection', (ws: WebSocket) => { + console.log('New WebSocket client connected'); + + sendScoreboardUpdate(ws); + + ws.on('close', () => { + console.log('WebSocket client disconnected'); + }); + + ws.on('error', (error) => { + console.error('WebSocket error:', error); + }); + }); + + console.log('WebSocket server initialized on /ws/scoreboard'); +}; + +export const broadcastScoreboardUpdate = (): void => { + if (!wss) { + console.warn('WebSocket server not initialized'); + return; + } + + const topScores = ScoreModel.getTopScores(10); + const message: WebSocketMessage = { + type: 'scoreboard_update', + data: { + scores: topScores, + updatedAt: new Date().toISOString(), + }, + timestamp: new Date().toISOString(), + }; + + const messageString = JSON.stringify(message); + + wss.clients.forEach((client) => { + if (client.readyState === WebSocket.OPEN) { + client.send(messageString); + } + }); + + console.log(`Broadcasted scoreboard update to ${wss.clients.size} clients`); +}; + +const sendScoreboardUpdate = (ws: WebSocket): void => { + const topScores = ScoreModel.getTopScores(10); + const message: WebSocketMessage = { + type: 'connection_established', + data: { + scores: topScores, + updatedAt: new Date().toISOString(), + }, + timestamp: new Date().toISOString(), + }; + + if (ws.readyState === WebSocket.OPEN) { + ws.send(JSON.stringify(message)); + } +}; diff --git a/src/problem6/test-websocket.html b/src/problem6/test-websocket.html new file mode 100644 index 000000000..1a2808da4 --- /dev/null +++ b/src/problem6/test-websocket.html @@ -0,0 +1,259 @@ + + + + + + WebSocket Scoreboard Test + + + +

🔌 WebSocket Scoreboard Test Client

+ +
+

Connection Status

+
Disconnected
+ + + +
+ +
+

📊 Live Scoreboard

+
+

Connect to WebSocket to see live updates...

+
+
+ +
+

📨 WebSocket Messages

+
+
+ + + + diff --git a/src/problem6/test-websocket.js b/src/problem6/test-websocket.js new file mode 100644 index 000000000..968b946e1 --- /dev/null +++ b/src/problem6/test-websocket.js @@ -0,0 +1,67 @@ +#!/usr/bin/env node + +/** + * Simple Node.js WebSocket test client + * Usage: node test-websocket.js + */ + +const WebSocket = require('ws'); + +const wsUrl = process.env.WS_URL || 'ws://localhost:3000/ws/scoreboard'; + +console.log('🔌 Connecting to WebSocket server:', wsUrl); +console.log('---\n'); + +const ws = new WebSocket(wsUrl); + +ws.on('open', () => { + console.log('✅ Connected to WebSocket server!'); + console.log('Waiting for messages...\n'); +}); + +ws.on('message', (data) => { + try { + const message = JSON.parse(data.toString()); + const timestamp = new Date().toISOString(); + + console.log(`[${timestamp}] 📨 Received message:`); + console.log(` Type: ${message.type}`); + + if (message.type === 'scoreboard_update' || message.type === 'connection_established') { + if (message.data && message.data.scores) { + console.log(` Scores: ${message.data.scores.length} players`); + console.log('\n Top 10 Leaderboard:'); + message.data.scores.forEach((score, index) => { + const medal = index === 0 ? '🥇' : index === 1 ? '🥈' : index === 2 ? '🥉' : ' '; + console.log(` ${medal} #${score.rank} ${score.username}: ${score.score} points`); + }); + } + } + + console.log('\n Full message:', JSON.stringify(message, null, 2)); + console.log('---\n'); + } catch (error) { + console.error('❌ Error parsing message:', error); + console.log('Raw data:', data.toString()); + } +}); + +ws.on('error', (error) => { + console.error('❌ WebSocket error:', error.message); + console.error(' Make sure the server is running on port 3000'); +}); + +ws.on('close', (code, reason) => { + console.log(`🔌 Connection closed (code: ${code}, reason: ${reason || 'none'})`); + process.exit(0); +}); + +// Handle graceful shutdown +process.on('SIGINT', () => { + console.log('\n👋 Closing connection...'); + ws.close(); +}); + +// Keep the process alive +process.stdin.resume(); + diff --git a/src/problem6/tsconfig.json b/src/problem6/tsconfig.json new file mode 100644 index 000000000..bbce4fff2 --- /dev/null +++ b/src/problem6/tsconfig.json @@ -0,0 +1,21 @@ +{ + "compilerOptions": { + "target": "ES2020", + "module": "commonjs", + "lib": ["ES2020"], + "outDir": "./dist", + "rootDir": "./src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "resolveJsonModule": true, + "moduleResolution": "node", + "declaration": true, + "declarationMap": true, + "sourceMap": true + }, + "include": ["src/**/*"], + "exclude": ["node_modules", "dist"] +} +