166 lines
4.5 KiB
Markdown
166 lines
4.5 KiB
Markdown
# 🚀 kotlin-api
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A reactive REST API built with **Kotlin**, **Spring Boot WebFlux**, and **MongoDB** — featuring JWT authentication, role-based access control, and OpenAPI documentation.
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---
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## 📋 Table of Contents
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- [Features](#-features)
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- [Tech Stack](#-tech-stack)
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- [Getting Started](#-getting-started)
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- [Prerequisites](#prerequisites)
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- [Configuration](#configuration)
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- [Run Locally](#run-locally)
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- [Run with Docker](#run-with-docker)
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- [API Reference](#-api-reference)
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- [Project Structure](#-project-structure)
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- [Development](#-development)
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---
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## ✨ Features
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- ⚡ **Reactive** — fully non-blocking with Spring WebFlux & Kotlin coroutines
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- 🔐 **JWT authentication** — AES-256-GCM encrypted tokens (JWE), access + refresh token flow
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- 🛡️ **Role-based access control** — `ROLE_ADMIN` and standard user roles
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- 🔄 **Token lifecycle management** — refresh, revocation, and session tracking
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- 📖 **OpenAPI / Swagger UI** — auto-generated, browsable API docs
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- 🐳 **Docker-ready** — multi-stage distroless image for minimal attack surface
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- ✅ **Code quality** — enforced with ktlint
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---
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## 🛠 Tech Stack
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| Layer | Technology |
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|---|---|
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| Language | Kotlin 2.4 |
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| Framework | Spring Boot 4.1 (WebFlux) |
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| Runtime | Java 21 |
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| Database | MongoDB 8 (reactive) |
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| Security | Spring Security + JJWT (JWE) |
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| Docs | SpringDoc OpenAPI 3 |
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| Testing | JUnit 5, MockK, embedded MongoDB |
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| Linting | ktlint 1.8 |
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---
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## 🏁 Getting Started
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### Prerequisites
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- Java 21+
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- MongoDB 8 (or Docker)
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### Configuration
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```bash
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cp .env.example .env
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```
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Edit `.env` and set the required values:
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| Variable | Description | Default |
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|---|---|---|
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| `MONGODB_URI` | MongoDB connection string | `mongodb://localhost:27017/kotlin-api` |
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| `JWT_ENCRYPTION_SECRET` | Base64-encoded 32-byte AES secret (**required**) | — |
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Generate a secret:
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```bash
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openssl rand -base64 32 | tr -d '\n'
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```
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### Run Locally
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```bash
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./gradlew bootRun
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```
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The API starts on **http://localhost:8080**.
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### Run with Docker
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```bash
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docker compose up --build
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```
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This spins up both the API and MongoDB with a persistent volume.
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---
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## 📡 API Reference
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All routes are versioned under `/v1`. Interactive docs available at **http://localhost:8080/swagger-ui.html**.
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### 🔓 Auth
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| Method | Endpoint | Auth | Description |
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|---|---|---|---|
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| `POST` | `/v1/auth/login` | — | Login, returns access + refresh tokens |
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| `POST` | `/v1/auth/refresh` | — | Exchange refresh token for a new access token |
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| `POST` | `/v1/auth/logout` | Bearer | Revoke all refresh tokens for the current user |
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### 👤 Users
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| Method | Endpoint | Auth | Description |
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|---|---|---|---|
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| `GET` | `/v1/users/me` | Bearer | Get current user info and active sessions |
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| `GET` | `/v1/users` | Admin | List all users |
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### 🔧 Admin
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| Method | Endpoint | Auth | Description |
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|---|---|---|---|
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| `POST` | `/v1/admin/users` | Admin | Create a new user |
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### 💚 Health
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| Method | Endpoint | Description |
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|---|---|---|
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| `GET` | `/v1/health` | API and MongoDB health status |
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---
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## 📁 Project Structure
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```
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src/main/kotlin/io/visus/demos/kotlinapi/
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├── api/ # Contracts (request/response DTOs), mappers, versioning
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├── config/ # Spring configuration (security, JWT, OpenAPI, MongoDB)
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├── controller/ # HTTP layer (Auth, Admin, Users, Health)
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├── domain/
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│ ├── model/ # Domain models
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│ ├── service/ # Business logic interfaces + implementations
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│ └── exception/ # Custom exceptions + global error handler
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├── infrastructure/
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│ ├── security/ # JWT filter, token provider, auth handlers
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│ └── user/ # Repository interfaces (MongoDB)
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└── seed/ # Data seeder (dev only)
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```
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---
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## 🧑💻 Development
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```bash
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# Run tests
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./gradlew test
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# Lint
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./gradlew ktlintCheck
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# Auto-fix lint issues
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./gradlew ktlintFormat
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# Check for dependency updates
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./gradlew dependencyUpdates
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```
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