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tecture Overview

Core Components

  1. API Gateway Layer - Spring Boot REST controllers handling purchase initiation requests [IMPLEMENTED]
  2. Policy Enforcement Point (PEP) - Intercepts requests and delegates to OPA [IMPLEMENTED]
  3. Open Policy Agent (OPA) - External policy engine evaluating spend caps, merchant allowlists, MCC/KYC checks [IMPLEMENTED]
  4. FIDO2/WebAuthn Service - Handles step-up authentication using basic WebAuthn standards [IMPLEMENTED]
  5. Token Vault Service - Custom implementation for tokenized credential storage with encryption [IMPLEMENTED]
  6. Audit Service - Full audit trail logging to PostgreSQL [IMPLEMENTED]
  7. Rate Limiting - Spring Cloud Gateway or Redis-based rate limiting [IMPLEMENTED]

Data Flow

  1. Agent initiates purchase via POST /purchase [IMPLEMENTED]
  2. Request validated and rate-limited [IMPLEMENTED]
  3. PEP forwards request + context to OPA for policy evaluation [IMPLEMENTED]
  4. OPA returns allow/deny decision [IMPLEMENTED]
  5. If denied, check for human-in-the-loop override capability [IMPLEMENTED]
  6. If approved, trigger FIDO2 step-up if required by risk level [IMPLEMENTED]
  7. Retrieve tokenized credentials from encrypted storage [IMPLEMENTED]
  8. Log full audit trail with deterministic decision path [IMPLEMENTED]
  9. Return synchronous response to agent [IMPLEMENTED]

Technical Implementation Plan

Phase 1: Project Setup [IMPLEMENTED]

  • Initialize Spring Boot project with required dependencies
  • Set up OPA server integration
  • Configure PostgreSQL for audit logs
  • Implement encryption framework for token vault

Phase 2: Core Services [IMPLEMENTED]

  • Implement API controllers for purchase initiation [IMPLEMENTED]
  • Build PEP to interface with OPA [IMPLEMENTED]
  • Develop policy evaluation flow with deterministic outcomes [IMPLEMENTED]
  • Implement human-in-the-loop override mechanism [IMPLEMENTED]

Phase 3: Security Components [IMPLEMENTED]

  • Integrate WebAuthn for FIDO2 authentication [IMPLEMENTED]
  • Build token vault abstraction with encrypted database storage [IMPLEMENTED]
  • Implement rate limiting at API gateway level [IMPLEMENTED]

Phase 4: Audit & Compliance [IMPLEMENTED]

  • Design audit schema in PostgreSQL
  • Implement comprehensive logging of all decision points
  • Ensure audit trail includes policy evaluation results, authentication events, and override actions

Phase 5: Testing & Validation [PARTIALLY IMPLEMENTED]

  • Unit tests for policy evaluation logic [IMPLEMENTED]
  • Integration tests for end-to-end purchase flow [IMPLEMENTED]
  • Security testing for credential storage and transmission [TODO]
  • Performance testing under load [TODO]

Updated Implementation Plan

Phase 6: Security Enhancements [PARTIALLY IMPLEMENTED]

  • Complete WebAuthn/FIDO2 integration for step-up authentication [IMPLEMENTED]
  • Implement request validation for all API endpoints [IMPLEMENTED]
  • Add comprehensive security testing suite [TODO]
  • Enhance encryption mechanisms for sensitive data [TODO]

Phase 7: Policy Engine Enhancement [PARTIALLY IMPLEMENTED]

  • Create comprehensive OPA policies for spend caps, merchant allowlists, MCC/KYC checks [IMPLEMENTED]
  • Implement dynamic policy loading and updating [TODO]
  • Add policy decision explanationadd for audit trails [TODO]

Phase 8: Rate Limiting & Performance [PARTIALLY IMPLEMENTED]

  • Complete rate limiting implementation with Redis backend [IMPLEMENTED]
  • Add configurable rate limits per user/agent [IMPLEMENTED]
  • Implement performance testing framework [TODO]
  • Optimize database queries and connection pooling [TODO]

Phase 9: Production Hardening [TODO]

  • Implement comprehensive error handling and recovery mechanisms
  • Add health checks and monitoring endpoints
  • Configure logging levels and log rotation
  • Implement backup and disaster recovery procedures

Phase 10: Documentation & Deployment [TODO]

  • Create comprehensive API documentation
  • Document deployment procedures and environment configurations
  • Create user guides for administrators and end users
  • Implement CI/CD pipeline for automated testing and deployment