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- Implemented ECDSA signature validation and anti-replay attack logic - Added global X-API-Key validation for IoT devices - Built Redis-backed rate limiter (50 req/sec) to prevent DoS - Replaced REST polling with WebSockets and Redis Pub/Sub for alerts - Updated stress and broadcast tests to support new security/limits
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🌋 Overview
This PR resolves Issue #19 (Security & Rate Limiting) and Issue #27 (Real-Time Notifications). It introduces critical security and scalability improvements to the FastAPI backend, preparing the API gateway to safely handle production IoT traffic and broadcast instant alerts.
🛠️ Key Changes
X-API-Keyvalidation for all IoT endpoints. Implemented strict ECDSA cryptographic signature validation and timestamp checking to block spoofed payloads and Replay attacks./ws/alerts). Hooked WebSockets into Redis Pub/Sub to instantly broadcast life-saving alerts to hundreds of clients across multiple containers.tests/stress_test.pyto include proper API headers, simulate malicious Replay/Bad Signature attacks, and pace requests to respect the new rate limiter.tests/test_websocket_broadcast.pyto verify Pub/Sub broadcasting to concurrent mobile clients.🧪 Testing Performed
stress_test.pywith 200 concurrent virtual sensors. Rate limiter successfully handled traffic bursts.401 Unauthorizedand403 Forbidden.test_websocket_broadcast.pysimulating 100 concurrent mobile clients receiving instant Redis alerts.docker compose up --buildworks cleanly with new dependencies (redis,websockets)./statistics) is temporarily skipped as the endpoint has not been implemented yet.worker.pyto asynchronously persist the valid payloads to PostGIS.