🌐 URL Shortener Backend Service 📖 Overview This is a backend service for a URL Shortener application, built with Spring Boot. The service supports multiple strategies (engines) for generating unique short URLs, including:

Base64 MD5 Hash UUID With a robust design and flexible architecture, users can select their preferred engine to generate short URLs via an API parameter.

✨ Features 🚀 Generate Short URLs: Supports multiple engines: Base64, MD5, and UUID. ⚙️ Flexible Engine Selection: Choose the URL generation engine dynamically via API input. 📡 RESTful API: Create and resolve short URLs with ease. 🧩 Spring Boot Integration: Uses Spring's Dependency Injection to manage engines and implement the factory pattern. 🔒 Thread-Safe Counter: Ensures unique IDs for Base64 generation.

📡 API Documentation 1️⃣ Shorten URL Endpoint: POST /api/shorten Description: Generates a short URL for the provided long URL using the specified engine.

Parameter Type Description originalUrl String The long URL to shorten (required). engineType String The engine to use: BASE64, MD5, or UUID (required). Example Request: bash

curl -X POST "http://localhost:8080/api/v1/urls?originalUrl=http://example.com&engineType=BASE64"

Example Response: { "shortUrl": "http://localhost:8080/abc12345" } 2️⃣ Resolve Short URL Endpoint: GET /{shortUrl} Description: Redirects to the original URL associated with the given short URL.

Parameter Type Description shortUrl String The short URL path to resolve (required). Example Request: bash

curl -X GET "http://localhost:8080/abc12345" Behavior: Redirects to the original URL. Returns 404 Not Found if the short URL does not exist.

⚙️ Engines Engine Description Base64 Encodes unique IDs using Base64 format to generate an 8-character short URL. MD5 Hash Creates a hash of the original URL and trims it to the first 8 characters. UUID Generates a random 8-character string using Java's UUID class.

📊 Analytics Dashboard Static React pages are located under src/main/resources/static.

• Open http://localhost:8090/index.html to shorten URLs.
• The admin dashboard is available at http://localhost:8090/dashboard.html and is protected with HTTP basic authentication (admin/password).