Webhook delivery service#103
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…and SSRF Protection - Added Node.js/TypeScript based off-chain Webhook Delivery Service featuring an async event memory queue to maintain <10ms response latencies, below the 100ms P99 technical SLA bounds. - Implemented robust security features including HMAC-SHA256 and Ed25519 payload signatures, strict replay protection window validation, and rigorous SSRF IP/DNS blacklists. - Implemented automatic retry engine with exponential backoff and randomized "Full Jitter". - Added standard Prometheus operational metrics (attempts, latency histograms, current queue size, failure counters). - Built a comprehensive test suite (17 tests) in Jest with ~90% code coverage. - Integrated a polished "Webhook Delivery & Monitoring" card and dispatch simulator on the user dashboard. - Documented system architecture, blue-green deployment guides, canary analysis, and recovery runbooks inside docs/ folder. Co-authored-by: gloskull <189399494+gloskull@users.noreply.github.com>
Webhook Delivery Service with Retry and Signature Verification
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This submission implements the entire Webhook Delivery Service specification (Issue #112).
Key highlights:
Core Delivery Service: Fully asynchronous delivery queue that returns a 202 Accepted instantly (<10ms, well within the 100ms SLA).
Robust Cryptographic Verification: Supports both shared secret HMAC-SHA256 and asymmetric Ed25519 signature headers to guarantee authenticity to the receiver.
Resilient Retry Policy: Exponential backoff retry engine with randomized 'Full Jitter' to safeguard downstream endpoints.
Strict SSRF Protections: Deep IP range validations (RFC1918 subnets, loopbacks, localhost, AWS metadata IPs) prevent Server-Side Request Forgery.
Real-time Metrics: Collects and exposes standard Prometheus metrics and JSON stats summaries.
Frontend Monitoring: Created a visual interactive monitor card directly inside the Next.js usage dashboard with manual trigger simulation.
Production Documentation: Added comprehensive WEBHOOK_ARCHITECTURE.md, WEBHOOK_DEPLOYMENT.md, and WEBHOOK_RUNBOOK.md documents to guide operations, blue-green deployments, canary analyses, and key rotations.
Closes #67