JWT Authentication System Implementation

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JWT Authentication System Implementation

User Story

As a user, I want secure authentication with JWT tokens so that my account and tasks are protected.

Technical Requirements

• Implement JWT token generation with RS256 signing
• Create access tokens (15 min) and refresh tokens (7 days)
• Build registration endpoint with email validation
• Build login endpoint with secure password hashing
• Create JWT middleware for protected routes
• Implement token refresh mechanism
• Add password requirements and validation

Acceptance Criteria

• Registration creates users with bcrypt password hashing
• Login returns valid JWT access and refresh tokens
• JWT middleware properly validates and extracts claims
• Token refresh works with valid refresh tokens
• Invalid/expired tokens return appropriate error responses
• Rate limiting implemented for auth endpoints

Definition of Done

• All authentication endpoints functional
• JWT middleware protects routes correctly
• Password security requirements enforced
• Token refresh mechanism working
• Comprehensive unit tests for auth logic
• API documentation updated with auth flow

API Endpoints

POST /api/v1/auth/register
POST /api/v1/auth/login
POST /api/v1/auth/refresh
POST /api/v1/auth/logout
GET  /api/v1/auth/me

Implementation Guide

Required Dependencies

go get github.com/golang-jwt/jwt/v5
go get golang.org/x/crypto/bcrypt
go get github.com/go-playground/validator/v10

Password Requirements

• Minimum 8 characters
• At least one uppercase letter
• At least one lowercase letter
• At least one number
• At least one special character

Rate Limiting

• Registration: 5 attempts per hour per IP
• Login: 10 attempts per hour per IP
• Token refresh: 100 attempts per hour per user

Related Epic

Contributes to Epic #1: Core API Infrastructure