E-Commerce API

This is a Go-based e-commerce backend API built with the Gin framework and GORM for ORM. It is designed to be backend-only, RESTful, and optionally Stripe-integrated. You can use it for web or mobile storefronts as a secure and modular API service.

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🔧 Tech Stack

• Go (Gin + GORM)
• PostgreSQL (Neon or local)
• JWT Auth
• Stripe Payments
• Zod (for shared schema validation)
• Redis (for rate limiting + caching)

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📦 Features

• ✅ User authentication (signup, login, JWT)
• 🛒 Cart and cart items per user
• 📦 Product, category, and order management
• 💳 Stripe Checkout integration
• 🔐 Auth middleware (with claims)
• ✅ Zod schema validation (extra layer on frontend/backend if needed)
• 🚦 Rate limiting middleware backed by Redis for enhanced security and scalability
• 🧠 Optional reCAPTCHA validation for signup/login to prevent bot activity
• 📧 Email sending with Mailtrap (used for signup/order confirmations)
• 🚀 Redis caching integrated for product, category, order, and cart reads
• 🖼️ Image/file upload via Cloudinary (used for product images)
• 📊 Admin dashboard-ready routes like /admin/orders/stats
• 🔔 Stripe webhook endpoint for async payment updates
• 👥 Role-based access control for admin-only features
• 🧾 Invoice generation and email delivery (PDF attached or link)
• 🗃️ Invoice record logging in PostgreSQL
• 📈 Admin invoice reporting via /admin/invoices and /admin/invoices/stats

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🗂 Folder Structure

e-commerce-api/
├── controllers/     # HTTP handlers for routes
├── initializers/    # DB, Redis, and env config
├── middleware/      # JWT, rate limiting, admin role checks
├── models/          # GORM models
├── utils/           # Reusable utilities (cache, mail, recaptcha, etc.)
├── validators/      # Zod schemas (for optional validation)
├── main.go          # Application entry point
├── go.mod
├── .env.example     # Sample env vars
└── README.md

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📌 Setup Instructions

1. Clone the repo

git clone https://github.com/loid-lab/e-commerce-api.git
cd e-commerce-api

2. Setup environment

cp .env.example .env

Update .env with your configuration values:

• For Neon (cloud Postgres):

  DB_URL=postgres://user:[email protected]:5432/dbname
  SECRET=your_jwt_secret
  STRIPE_SECRET_KEY=sk_test_...
  REDIS_URL=redis://redis:6379
  SMTP_HOST=smtp.mailtrap.io
  SMTP_PORT=587
  SMTP_USER=your_username
  SMTP_PASS=your_password
  [email protected]
  [email protected]
  CLOUDINARY_CLOUD_NAME=your_cloud_name
  CLOUDINARY_API_KEY=your_api_key
  CLOUDINARY_API_SECRET=your_api_secret
  

• For local Postgres (optional, see Docker Compose below):

  DB_URL=postgres://postgres:example@localhost:6379/ecommercedb?sslmode=disable
  SECRET=your_jwt_secret
  STRIPE_SECRET_KEY=sk_test_...
  REDIS_URL=redis://localhost:6379
  SMTP_HOST=smtp.mailtrap.io
  SMTP_PORT=587
  SMTP_USER=your_username
  SMTP_PASS=your_password
  [email protected]
  [email protected]
  CLOUDINARY_CLOUD_NAME=your_cloud_name
  CLOUDINARY_API_KEY=your_api_key
  CLOUDINARY_API_SECRET=your_api_secret
  

Note:
This project uses Redis for rate limiting and caching. Set REDIS_URL and ensure Redis is running locally or remotely.

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3. Running with Docker Compose

Using Neon (cloud DB)

version: '3.8'
services:
  api:
    build: .
    ports:
      - "8080:8080"
    environment:
      DB_URL: ${DB_URL}
      SECRET: ${SECRET}
      STRIPE_SECRET_KEY: ${STRIPE_SECRET_KEY}
      STRIPE_WEBHOOK_SECRET: ${STRIPE_WEBHOOK_SECRET}
      REDIS_URL: ${REDIS_URL}
      SMTP_HOST: ${SMTP_HOST}
      SMTP_PORT: ${SMTP_PORT}
      SMTP_USER: ${SMTP_USER}
      SMTP_PASS: ${SMTP_PASS}
      MAIL_FROM: ${MAIL_FROM}
      CLOUDINARY_CLOUD_NAME: ${CLOUDINARY_CLOUD_NAME}
      CLOUDINARY_API_KEY: ${CLOUDINARY_API_KEY}
      CLOUDINARY_API_SECRET: 
      ${CLOUDINARY_API_SECRET}
    restart: unless-stopped

docker-compose up --build

Using local Postgres + Redis

Add db and redis services in docker-compose.yaml:

  db:
    image: postgres:15-alpine
    restart: always
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: example
      POSTGRES_DB: ecommercedb
    ports:
      - "5432:5432"

  redis:
    image: redis:7-alpine
    restart: always
    ports:
      - "6379:6379"

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🔐 Authentication

• POST /auth/signup — Register new user
• POST /auth/login — Login and receive JWT
• Authenticated routes require Authorization: Bearer <token>
• Admin-only routes are protected using role-based middleware. A User must have a Role field set to "admin" to access them.

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🧠 reCAPTCHA Support

Signup/login support reCAPTCHA v2/v3. Send recaptchaToken in form payload.

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💳 Payments (Stripe)

• POST /user/orders/:id/pay — Initiate Stripe checkout session
• POST /webhooks/stripe — Stripe webhook endpoint to update order/payment statuses asynchronously

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🧊 Redis Caching

Improves performance for heavy-read routes:

• 🔁 Products: GET /products, GET /products/:id
• 🔁 Orders: GET /orders, GET /orders/:id
• 🔁 Categories: GET /categories
• 🔁 Carts: GET /cart

Auto invalidation after create/update/delete where applicable.

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🛠 Zod Validation

Used optionally for frontend/backend data agreement via validators/.

🧾 Invoicing & Reporting

This project includes built-in support for invoicing and admin reporting.

• ✅ Automatically generate PDF invoices when an order is created
• ✅ Send invoice via email using configured SMTP credentials
• ✅ Store invoice records and line items in PostgreSQL
• ✅ Admin dashboard endpoints:
  • GET /admin/invoices — view all invoices
  • GET /admin/invoices/stats — aggregated reporting
• ✅ Optional support for Cloudinary or S3-based PDF storage

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📘 License

MIT — feel free to use, modify, or contribute.