GitHub - Bulletdev/go-cart-api: RESTful Go API for eccomerce management

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                         E-commerce Backend — go-cart-api

╔══════════════════════════════════════════════════════════════════════════════╗
║  go-cart-api — Go 1.23 · Clean Architecture · RESTful                        ║
╠══════════════════════════════════════════════════════════════════════════════╣
║  Production-ready e-commerce API. PIX + Stripe · NF-e · Argon2id             ║
║  Correios/MelhorEnvio · Circuit breaker · ACID transactions · LGPD compliant ║
╚══════════════════════════════════════════════════════════════════════════════╝

▶ Key Features (click to expand)

┌─────────────────────────────────────────────────────────────────────────────┐
│  [■] Argon2id Password Hashing  — OWASP: m=64MiB, t=3, p=4; no 72-byte cap  │
│  [■] JWT Authentication         — HS256, configurable TTL                   │
│  [■] RBAC                       — user | admin roles, endpoint guards       │
│  [■] Inventory / Stock Control  — atomic decrement inside order transaction │
│  [■] Soft Delete                — products + orders, LGPD compliant         │
│  [■] CPF Validation             — stored on profile, required at checkout   │
│  [■] PIX Payment                — ProPay + OpenPix, QR Code + copy-paste    │
│  [■] Credit Card                — Stripe server-side, Elements UI ready     │
│  [■] Coupon / Discount          — percent and fixed-value, per-order        │
│  [■] Transactional Emails       — order, payment, shipment, password reset  │
│  [■] Shipping Calculation       — Correios / Melhor Envio integration       │
│  [■] Nota Fiscal (NF-e)         — Focusnfe / eNotas, auto-emit on payment   │
│  [■] ACID Transactions          — order creation + stock + cart in one tx   │
│  [■] Circuit Breaker            — ProPay client: 3-state, in-process        │
│  [■] LRU Cache                  — products + categories, configurable TTL   │
│  [■] Pagination                 — all list endpoints, configurable limit    │
│  [■] Product Catalog            — search, by-category, featured flag        │
│  [■] Order Tracking             — public endpoint by tracking number        │
│  [■] Payment Webhooks           — PIX (HMAC-SHA256) + Stripe signature      │
│  [■] X-Request-ID               — log correlation across services           │
│  [■] Structured Logging         — slog, JSON output, all key fields         │
│  [■] Health Probes              — liveness + readiness (db.Ping)            │
│  [■] CORS                       — configurable origins via ENV              │
│  [■] Request Body Limit         — 1MB global middleware, DoS protection     │
│  [■] Connection Pooling         — pgx/v5 pool, configurable min/max conns   │
│  [■] CodeQL                     — security-extended, SARIF to GitHub        │
└─────────────────────────────────────────────────────────────────────────────┘

┌──────────────────────────────────────────────────────┐
│  01 · Quick Start                                    │
│  02 · Technology Stack                               │
│  03 · Architecture                                   │
│  04 · Setup                                          │
│  05 · API Documentation                              │
│  06 · Environment Variables                          │
│  07 · Testing                                        │
│  08 · Security                                       │
│  09 · Observability                                  │
│  10 · Deployment                                     │
│  11 · Contributing                                   │
│  12 · License                                        │
└──────────────────────────────────────────────────────┘

01 · Quick Start

# Clone and install
git clone https://github.com/bulletdev/go-cart-api.git
cd go-cart-api

# Configure environment
cp .env.example .env
# edit .env with your DATABASE_URL, JWT_SECRET, etc.

# Run migrations
migrate -database ${DATABASE_URL} -path internal/database/migrations up

# Start server
go run cmd/main.go
# → listening on :4444 (or $PORT)

# Health check
curl http://localhost:4444/health          # liveness
curl http://localhost:4444/ready           # readiness (db.Ping)

# Register and get token
TOKEN=$(curl -s -X POST http://localhost:4444/api/auth/login \
  -H "Content-Type: application/json" \
  -d '{"email":"you@example.com","password":"your_password"}' | jq -r .token)

# List products (paginated)
curl "http://localhost:4444/api/products?limit=20&offset=0"

▶ Docker (click to expand)

docker compose up -d

# Run migrations inside container
docker exec go-cart-api migrate -database ${DATABASE_URL} \
  -path internal/database/migrations up

Container	Port	Role
go-cart-api	4444	Go API
postgres	5432	PostgreSQL 17

02 · Technology Stack

╔══════════════════════╦════════════════════════════════════════════════════╗
║  LAYER               ║  TECHNOLOGY                                        ║
╠══════════════════════╬════════════════════════════════════════════════════╣
║  Language            ║  Go 1.23 (toolchain go1.24.1)                      ║
║  Router              ║  gorilla/mux v1.8.1                                ║
║  Database            ║  PostgreSQL 17 · pgx/v5                            ║
║  Authentication      ║  JWT HS256 (golang-jwt/jwt v5) · Argon2id hashing  ║
║  Cache               ║  LRU in-process (hashicorp/golang-lru)             ║
║  Payment — PIX       ║  ProPay + OpenPix · HMAC-SHA256 webhook            ║
║  Payment — Card      ║  Stripe server-side · stripe-go                    ║
║  Email               ║  Resend SDK                                        ║
║  Shipping            ║  Correios API · Melhor Envio                       ║
║  Nota Fiscal         ║  Focusnfe / eNotas (REST)                          ║
║  Circuit Breaker     ║  In-process · 3-state (Closed/Open/HalfOpen)       ║
║  Config              ║  godotenv + typed helpers                          ║
║  Testing             ║  testify · handler mocks                           ║
║  CI                  ║  GitHub Actions · CodeQL security-extended         ║
╚══════════════════════╩════════════════════════════════════════════════════╝

03 · Architecture

Clean Architecture — total decoupling between business logic and infrastructure providers.

cmd/
└── main.go                  # wiring: config, db, repos, handlers, router

internal/
├── auth/                    # JWT mint/validate · Argon2id hasher · middleware
├── cache/                   # LRU memory cache with TTL + GC goroutine
├── circuit/                 # 3-state circuit breaker (Closed/Open/HalfOpen)
├── clients/
│   └── propay/              # ProPay HTTP client (JWT ServiceClaims + breaker)
├── config/                  # typed ENV loader (getEnv, getInt, getDuration…)
├── database/                # pgx pool + migrations
├── handlers/                # HTTP handlers (one per domain)
├── middleware/              # CORS · RequestID · BodyLimit · RateLimit
├── models/                  # domain structs (Order, Product, User…)
├── [domain]/
│   ├── repository.go        # interface + postgres implementation
│   └── repository_mock.go   # mock for unit tests
└── webutils/                # WriteJSON · ErrorJSON · RawJSON · ReadJSON

Core principles:

Interface-based repositories — swap DB or inject mocks without touching handlers
All mutations in ACID transactions — order + stock decrement + cart clear in one pgx.Tx
Goroutine-based background jobs — time.NewTicker for cleanup tasks, no external scheduler
In-process circuit breaker — no Redis dependency, shared state per server instance

Request flow

graph LR
    Client -->|HTTP| CORS
    CORS --> BodyLimit
    BodyLimit --> RequestID
    RequestID --> Auth["Auth Middleware\n(JWT validate)"]
    Auth --> Handler
    Handler --> Cache["LRU Cache\n(read path)"]
    Handler --> Repository
    Repository --> PostgreSQL
    Handler --> ProPayClient["ProPay Client\n(circuit breaker)"]
    ProPayClient --> ProPay
    Handler --> Stripe
    Handler --> Resend["Email\n(Resend)"]

Endpoint map

graph LR
    subgraph "Public"
        H["GET /health\nGET /ready"]
        Auth["POST /auth/register\nPOST /auth/login\nPOST /auth/forgot-password\nPOST /auth/reset-password"]
        Prod["GET /products\nGET /products/search\nGET /products/featured\nGET /products/category/{id}\nGET /products/{id}"]
        Cat["GET /categories\nGET /categories/{id}"]
        Ship["POST /shipping/calculate"]
        Track["GET /orders/tracking/{number}"]
        WH["POST /webhooks/payment\nPOST /webhooks/stripe"]
    end

    subgraph "Protected — any user"
        Me["GET /users/me\nPUT /users/me"]
        Addr["GET|POST|PUT|DELETE /users/{id}/addresses\nPATCH …/default"]
        Cart["GET /cart\nPOST /cart/items\nPUT|DELETE /cart/items/{pid}\nDELETE /cart\nPOST /cart/coupon"]
        Orders["POST /orders\nGET /orders\nGET /orders/{id}\nPATCH /orders/{id}/cancel\nPOST /orders/{id}/pay"]
    end

    subgraph "Admin only"
        ProdAdmin["POST|PUT|DELETE /products/{id}\nPATCH /products/{id}/stock"]
        CatAdmin["POST|PUT|DELETE /categories/{id}"]
        OrdAdmin["PATCH /orders/{id}/tracking"]
    end

04 · Setup

Prerequisites

[✓] Go 1.23+
[✓] PostgreSQL 17+
[✓] golang-migrate CLI   — github.com/golang-migrate/migrate

▶ Installation (click to expand)

1. Clone:

git clone https://github.com/bulletdev/go-cart-api.git
cd go-cart-api

2. Dependencies:

go mod tidy

3. Environment:

cp .env.example .env
# fill in required vars — see §06 Environment Variables

4. Migrations:

migrate -database "${DATABASE_URL}" -path internal/database/migrations up

5. Run:

go run cmd/main.go
# API → http://localhost:4444
# Health → http://localhost:4444/health

6. Seed (optional):

go run scripts/seed.go

05 · API Documentation

▶ Full endpoint reference (click to expand)

Authentication

All protected endpoints require:

Authorization: Bearer <jwt-token>

╔═══════════════╦══════════════════════════════╗
║  Algorithm    ║  HS256                       ║
║  TTL          ║  24h (JWT_TTL)               ║
║  Issued by    ║  POST /api/auth/login        ║
╚═══════════════╩══════════════════════════════╝

Auth

Method	Endpoint	Auth	Description
POST	`/api/auth/register`	—	Register new user
POST	`/api/auth/login`	—	Login, returns JWT
POST	`/api/auth/forgot-password`	—	Send password reset email
POST	`/api/auth/reset-password`	—	Reset password with token

Users

Method	Endpoint	Auth	Description
GET	`/api/users/me`	user	Get current user profile
PUT	`/api/users/me`	user	Update name, email, CPF
GET	`/api/users/{id}/addresses`	user	List user addresses
POST	`/api/users/{id}/addresses`	user	Add address
PUT	`/api/users/{id}/addresses/{aid}`	user	Update address
DELETE	`/api/users/{id}/addresses/{aid}`	user	Remove address
PATCH	`/api/users/{id}/addresses/{aid}/default`	user	Set default address

Products

Method	Endpoint	Auth	Description
GET	`/api/products`	—	List products (paginated)
GET	`/api/products/search?q=`	—	Full-text search (paginated)
GET	`/api/products/featured`	—	Featured products
GET	`/api/products/category/{id}`	—	Products by category (paginated)
GET	`/api/products/{id}`	—	Product detail
POST	`/api/products`	admin	Create product
PUT	`/api/products/{id}`	admin	Update product
DELETE	`/api/products/{id}`	admin	Soft-delete product
PATCH	`/api/products/{id}/stock`	admin	Update stock

Cart

Method	Endpoint	Auth	Description
GET	`/api/cart`	user	Get cart with items
POST	`/api/cart/items`	user	Add item (validates stock)
PUT	`/api/cart/items/{pid}`	user	Update quantity
DELETE	`/api/cart/items/{pid}`	user	Remove item
DELETE	`/api/cart`	user	Clear cart
POST	`/api/cart/coupon`	user	Apply coupon code

Orders

Method	Endpoint	Auth	Description
POST	`/api/orders`	user	Create order from cart (ACID: stock decrement + cart clear)
GET	`/api/orders`	user	List user orders (paginated)
GET	`/api/orders/{id}`	user	Order detail with items
PATCH	`/api/orders/{id}/cancel`	user	Cancel order
POST	`/api/orders/{id}/pay`	user	Initiate payment (PIX or credit card)
PATCH	`/api/orders/{id}/tracking`	admin	Set tracking number (triggers shipment email)
GET	`/api/orders/tracking/{number}`	—	Public order tracking by number

Shipping

Method	Endpoint	Auth	Description
POST	`/api/shipping/calculate`	—	Calculate shipping options by CEP + cart weight

Request:

{
  "cep_destino": "01310-100",
  "items": [
    { "product_id": "uuid", "quantity": 2 }
  ]
}

Response:

{
  "options": [
    { "carrier": "PAC", "price_cents": 1850, "days": 7 },
    { "carrier": "SEDEX", "price_cents": 3200, "days": 2 }
  ]
}

Payment

PIX — POST /api/orders/{id}/pay

{ "method": "pix" }

Response:

{
  "qr_code": "data:image/png;base64,...",
  "qr_code_url": "https://...",
  "txid": "abc123...",
  "expires_at": "2026-06-01T15:30:00Z"
}

Credit Card — POST /api/orders/{id}/pay

{ "method": "credit_card" }

Response:

{
  "client_secret": "pi_xxx_secret_yyy"
}

Use client_secret with Stripe Elements on the frontend to collect card details.

Webhooks

Method	Endpoint	Auth	Description
POST	`/api/webhooks/payment`	HMAC (`X-Propay-Signature`)	PIX confirmation from ProPay
POST	`/api/webhooks/stripe`	Stripe-Signature	Card payment confirmation

Both webhooks perform an atomic UPDATE orders SET payment_status='paid', status='processing' WHERE id=$1 AND payment_status='pending_payment' — idempotent by design.

Health & Observability

Method	Endpoint	Auth	Description
GET	`/health`	—	Liveness — always 200 while process runs
GET	`/ready`	—	Readiness — 503 if `db.Ping()` fails

06 · Environment Variables

▶ All environment variables (click to expand)

# ── Core (required) ───────────────────────────────────────────────────────────
DATABASE_URL=postgres://user:pass@host:5432/dbname
JWT_SECRET=your-256-bit-secret
JWT_TTL=24h

# ── Server ────────────────────────────────────────────────────────────────────
PORT=4444
ALLOWED_ORIGINS=https://yourstore.com,http://localhost:8880
LOG_LEVEL=info                         # debug | info | warn | error

# ── Cache ─────────────────────────────────────────────────────────────────────
CACHE_ENABLED=true
CACHE_L1_MAX_SIZE=1000                 # max LRU entries
CACHE_TTL_PRODUCTS=5m
CACHE_TTL_CATEGORIES=15m

# ── Payment — PIX (ProPay) ────────────────────────────────────────────────────
PROPAY_URL=https://propay.internal
GO_TO_PROPAY_SECRET=secret-for-jwt-go-to-propay
PROPAY_TO_GO_SECRET=secret-for-hmac-propay-to-go
PROPAY_TIMEOUT=5s

# ── Payment — Card (Stripe) ───────────────────────────────────────────────────
STRIPE_SECRET_KEY=sk_live_...
STRIPE_WEBHOOK_SECRET=whsec_...

# ── Email (Resend) ────────────────────────────────────────────────────────────
RESEND_API_KEY=re_...
MAILER_FROM_EMAIL=noreply@yourstore.com
FRONTEND_URL=https://yourstore.com

# ── Shipping ──────────────────────────────────────────────────────────────────
SHIPPING_PROVIDER=melhorenvio          # correios | melhorenvio
SHIPPING_API_KEY=...
SHIPPING_SENDER_CEP=01310100

# ── Nota Fiscal (NF-e) ────────────────────────────────────────────────────────
NFE_PROVIDER=focusnfe                  # focusnfe | enotas
NFE_API_KEY=...
NFE_CNPJ=00000000000100
NFE_AMBIENTE=producao                  # homologacao | producao

# ── Circuit Breaker (ProPay client) ──────────────────────────────────────────
CIRCUIT_BREAKER_THRESHOLD=5           # failures before open
CIRCUIT_BREAKER_TIMEOUT=60s           # window for counting failures
CIRCUIT_BREAKER_COOLDOWN=30s          # time open before half-open probe

07 · Testing

# All tests
go test ./...

# Handlers (with mocks)
go test -v ./internal/handlers/...

# Auth
go test -v ./internal/auth/...

# With coverage
go test -coverprofile=coverage.out ./...
go tool cover -html=coverage.out

08 · Security

[✓] Argon2id — OWASP: m=64MiB, t=3, p=4 · no 72-byte truncation
[✓] SQL injection — pgx prepared statements throughout
[✓] Password never exposed — json:"-" tag on all hash fields
[✓] CORS — configurable allowlist, no wildcard in production
[✓] Request body limit — 1MB global middleware
[✓] JWT audience claim — service tokens scoped to target (aud: ["propay"])
[✓] Webhook HMAC-SHA256 — X-Propay-Signature + Stripe-Signature verified before processing
[✓] Secrets per direction — GO_TO_PROPAY_SECRET ≠ PROPAY_TO_GO_SECRET
[✓] RBAC — admin guards on all product/category mutation endpoints
[✓] ACID transactions — no partial state on concurrent order creation
[✓] Idempotent webhooks — UPDATE … WHERE payment_status='pending_payment'
[✓] Soft delete — no hard deletes on orders or products
[✓] Action SHA pinning — all GitHub Actions pinned to commit SHA (supply chain hardening)
[✓] golangci-lint — govet, staticcheck, errcheck, revive, gocritic, gosec, ineffassign, unused
[✓] gosec — SAST: SQL injection, hardcoded secrets, path traversal, weak crypto
[✓] Semgrep — p/golang + p/secrets, runs on every push + weekly
[✓] govulncheck — CVE scan on all Go dependencies, blocks PR on findings
[✓] Dependency review — blocks PRs with deps of severity ≥ moderate
[✓] CodeQL — security-extended + security-and-quality, runs on every push + weekly
[✓] Qodana — static analysis, Codacy-compatible reports

Rate Limiting

Rule	Limit	Window
`POST /auth/login`	5 requests	20 seconds per IP
`POST /auth/register`	3 requests	1 hour per IP
`POST /auth/forgot-password`	5 requests	1 hour per IP
Global per IP	300 requests	configurable

09 · Observability

Health Probes

Endpoint	Purpose	Returns
`GET /health`	Liveness — is the process alive?	Always 200
`GET /ready`	Readiness — can the DB be reached?	200 / 503

Never point a liveness probe at an endpoint that checks the DB. A DB crash → liveness fail → restart loop → reconnection storm → worse incident.

X-Request-ID

Every request receives an X-Request-ID header (read from client or generated as UUID v4). Propagated through context and included in all structured log lines — use it to correlate logs across go-cart-api, ProPay, and email service.

Structured Logging

All log output is JSON via slog. Standard fields on every line:

{
  "time": "2026-06-01T14:00:00Z",
  "level": "INFO",
  "msg": "order created",
  "request_id": "550e8400-e29b-41d4-a716-446655440000",
  "user_id": "...",
  "order_id": "...",
  "total": 149.90
}

Circuit Breaker — ProPay Client

closed  (normal)    — requests pass through; failure count tracked per window
open    (tripped)   — POST /orders/{id}/pay returns 503 immediately, no upstream call
half-open (recovery)— one probe request; success closes, failure re-opens

Parameter	Default	ENV
Failure threshold	5 in 60s	`CIRCUIT_BREAKER_THRESHOLD` + `CIRCUIT_BREAKER_TIMEOUT`
Cooldown (open→half-open)	30s	`CIRCUIT_BREAKER_COOLDOWN`

10 · Deployment

Ecosystem

go-cart-api is the BFF (Backend for Frontend) in the clubedojava stack. Services it integrates with:

Service	Stack	Role
ProPay	Ruby · Roda · Sidekiq	Payment gateway — PIX via OpenPix + Efi Bank
clubedojava	React 18 · Vite · TypeScript	Frontend SPA — consumes this API

Payment flow

graph TD
    Frontend -->|POST /orders/:id/pay| API["go-cart-api"]
    API -->|JWT ServiceClaims| ProPay
    ProPay -->|QR Code| OpenPix
    OpenPix -->|HMAC webhook| ProPay
    ProPay -->|X-Propay-Signature| API
    API -->|UPDATE atomic| PostgreSQL
    API -->|payment email| Resend
    API -->|NF-e emit| NFe["Focusnfe / eNotas"]

Environment

[✓] Stateless — no server-side session, horizontal scaling ready
[✓] Single binary — go build -o go-cart-api cmd/main.go
[✓] PORT env — compatible with Railway, Render, Fly.io, Coolify
[✓] Graceful shutdown — SIGTERM drains in-flight requests (30s timeout)
[✓] Docker — Dockerfile included

# Build
go build -o go-cart-api cmd/main.go

# Docker
docker build -t go-cart-api .
docker run -p 4444:4444 --env-file .env go-cart-api

CI/CD

Workflow	Trigger	What it does
`go.yml`	Push / PR	`lint` (golangci-lint) → `vuln` (govulncheck) → `build + test -race` · lint gates build
`security.yml`	Push / PR + weekly Mon	Semgrep `p/golang` + `p/secrets` · results saved as artifact
`codeql.yml`	Push / PR + weekly Tue	CodeQL `security-extended,security-and-quality` · SARIF to GitHub Security tab
`dependency-review.yml`	Pull Request	Blocks PRs with dependencies of severity ≥ moderate
`qodana_code_quality.yml`	Push / PR	Qodana static analysis · Codacy-compatible reports

All actions pinned to commit SHA (supply chain hardening). To update a pin: git ls-remote --tags https://github.com/<owner>/<action>.git and update the SHA + version comment.

11 · Contributing

Fork the repository
Create a feature branch: git checkout -b feature/my-feature
Make your changes following the patterns below
Add tests for new handlers and business logic
Ensure all tests pass: go test ./...
Submit a pull request

Branch naming

feature/ — new features
fix/ — bug fixes
refactor/ — internal refactoring
docs/ — documentation
security/ — security fixes

Patterns to follow

New domain → add internal/{domain}/repository.go with interface + postgres impl + mock
New endpoint → add handler method + register route in setupRoutes in cmd/main.go
Every handler reads user identity via getAuthenticatedUserID(r) from context
Mutations that touch multiple tables → use pgx.Tx, always defer tx.Rollback(ctx)
Errors returned to client → webutils.ErrorJSON(w, err, status) only
No comments explaining WHAT the code does — name things clearly instead

12 · License

╔══════════════════════════════════════════════════════════════════════════════╗
║  go-cart-api                                                                 ║
║  GNU General Public License v3.0 (GPLv3)                                     ║
╚══════════════════════════════════════════════════════════════════════════════╝

Author: Michael Bullet — michael@prostaff.gg
Web: michaelbullet.dev
License: GNU General Public License v3.0

▓▒░ · go-cart-api · michaelbullet.dev · ░▒▓

Name		Name	Last commit message	Last commit date
Latest commit History 344 Commits
.github		.github
.idea		.idea
cmd		cmd
docs		docs
internal		internal
output		output
public		public
vendor		vendor
.gitignore		.gitignore
api.js		api.js
bullet.env		bullet.env
docker-compose.yml		docker-compose.yml
docker.yaml		docker.yaml
dockerfile		dockerfile
go-cart-api		go-cart-api
go.mod		go.mod
go.sum		go.sum
main		main
qodana.yaml		qodana.yaml
readme.md		readme.md
render.yaml		render.yaml
swagger.yaml		swagger.yaml

Method	Endpoint	Auth	Description
GET	`/api/categories`	—	List categories
GET	`/api/categories/{id}`	—	Category detail
POST	`/api/categories`	admin	Create category
PUT	`/api/categories/{id}`	admin	Update category
DELETE	`/api/categories/{id}`	admin	Delete category

Uh oh!

Folders and files

Latest commit

History

Repository files navigation

Table of Contents

01 · Quick Start

02 · Technology Stack

03 · Architecture

Request flow

Endpoint map

04 · Setup

Prerequisites

05 · API Documentation

Authentication

Auth

Users

Products

Categories

Cart

Orders

Shipping

Payment

Webhooks

Health & Observability

06 · Environment Variables

07 · Testing

08 · Security

Rate Limiting

09 · Observability

Health Probes

X-Request-ID

Structured Logging

Circuit Breaker — ProPay Client

10 · Deployment

Ecosystem

Payment flow

Environment

CI/CD

11 · Contributing

Branch naming

Patterns to follow

12 · License

About

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