Skip to content

PR_TEMPLATE.md

Latest commit

 

History

History
114 lines (87 loc) · 4.61 KB

PR_TEMPLATE.md

File metadata and controls

114 lines (87 loc) · 4.61 KB
Raw

Fix #357: Implement Comprehensive Rate Limiting System

Summary

This PR implements a comprehensive rate limiting system to protect critical operations, ensure fair usage, and maintain system stability. The implementation addresses the missing rate limiting mechanisms identified in issue #357.

Changes Made

🔧 Core Rate Limiting Implementation

  • Enhanced RateLimitGuard with decorator support and monitoring integration
  • User Tier-Based Rate Limits supporting FREE, BASIC, PREMIUM, and ENTERPRISE tiers
  • Comprehensive Monitoring Service with violation logging and pattern detection
  • Rate Limit Decorators for easy endpoint-specific configuration

🛡️ Critical Operations Protected

  • Authentication endpoints (/auth/*) - 5 requests per 15 minutes (AUTH preset)
  • Payment endpoints (/payments/*) - 10 requests per minute for expensive operations (EXPENSIVE preset)
  • Public endpoints - 120 requests per minute (PUBLIC preset)
  • API endpoints - 60 requests per minute (API preset)

📊 Monitoring & Analytics

  • Violation logging with detailed metadata (user, IP, endpoint, tier)
  • Pattern detection for suspicious activities:
    • High-frequency IP detection (>50 violations in 5 minutes)
    • Distributed attack detection (>100 unique IPs with >500 violations)
    • Endpoint abuse detection (>100 violations per endpoint)
  • Integration ready for Elasticsearch, Sentry, and custom analytics
  • Statistics dashboard with violation metrics and trends

📚 Documentation

  • Comprehensive rate limit policies document (docs/rate-limit-policies.md)
  • Configuration guidelines and best practices
  • Security considerations and compliance information
  • Troubleshooting guide for common issues

Rate Limit Tiers

Tier Requests/Minute Strategy Use Case
FREE 60 IP-based Public access
BASIC 150 IP + User Standard users
PREMIUM 500 User-based Premium subscribers
ENTERPRISE 2000 User-based Enterprise customers

Technical Features

  • Sliding window algorithm for fair request distribution
  • Redis and in-memory stores for scalability
  • Fail-open strategy for high availability
  • Rate limit headers (X-RateLimit-*) for client-side handling
  • Automatic tier detection based on user subscriptions and roles
  • Decorator-based configuration for easy endpoint protection

Files Added/Modified

New Files

  • src/rate-limit/services/user-tier-rate-limit.service.ts - User tier management
  • src/rate-limit/services/rate-limit-monitoring.service.ts - Violation monitoring
  • docs/rate-limit-policies.md - Comprehensive documentation

Modified Files

  • src/rate-limit/guards/rate-limit.guard.ts - Enhanced with monitoring and tier support
  • src/rate-limit/rate-limit.module.ts - Updated module configuration
  • src/auth/auth.controller.ts - Added AUTH rate limiting to critical endpoints
  • src/payments/controllers/payment.controller.ts - Added EXPENSIVE rate limiting

Testing

The implementation includes:

  • Fail-safe mechanisms to prevent service disruption
  • Comprehensive logging for debugging and monitoring
  • Pattern detection for security monitoring
  • Rate limit headers for client-side integration

Security Considerations

  • IP-based protection for anonymous users
  • User-based limits for authenticated users
  • Tier-based adjustments for subscription levels
  • Monitoring integration for threat detection
  • Fail-open strategy to maintain availability

Breaking Changes

None. This is a non-breaking addition that enhances security without affecting existing functionality.

Configuration

Environment variables available:

RATE_LIMIT_REDIS_URL=redis://localhost:6379
RATE_LIMIT_DEFAULT_LIMIT=60
RATE_LIMIT_DEFAULT_WINDOW_MS=60000
RATE_LIMIT_ENABLE_MONITORING=true

Acceptance Criteria

✅ Implement rate limiting mechanisms - Complete with decorator-based system
✅ Add user-specific rate limits - Four-tier system implemented
✅ Monitor rate limit violations - Full monitoring with pattern detection
✅ Document rate limit policies - Comprehensive documentation created

Impact

This implementation significantly improves the security posture of the application by:

  • Preventing brute force attacks on authentication endpoints
  • Protecting financial operations from abuse
  • Ensuring fair resource allocation across users
  • Providing visibility into usage patterns and potential threats
  • Supporting scalable growth with tier-based limits

Related Issues

Fixes #357: No Rate Limiting