gru_emoney_token-factory/tools/rbc/IMPLEMENTATION.md

RailBridge Composer Implementation Summary

Completed Components

Smart Contracts

• ✅ PacketRegistry.sol - On-chain packet lifecycle registry
• ✅ IPacketRegistry.sol - Interface for packet registry

Core Modules

• ✅ Instruction types and data models
• ✅ Composer engine (orchestrates PDF generation, signing, packaging)
• ✅ Instruction validator
• ✅ Sidecar file generator (JSON, XML, hashes)

PDF Generation

• ✅ PDF generator using PDFKit
• ✅ PDF layout utilities (cover page, MT103 fields, signatures, appendix)
• ✅ QR code generation for verification
• ✅ PDF signing module (PAdES support)

Templates

• ✅ Template engine (Handlebars)
• ✅ MT103-equivalent credit transfer template
• ✅ Recall/cancellation template
• ✅ Return/reject template
• ✅ Settlement confirmation template

Crypto & Security

• ✅ Hashing (SHA-256, SHA3-256)
• ✅ PGP encryption
• ✅ S/MIME encryption

Transport Modules

• ✅ Secure email transport (PGP + S/MIME)
• ✅ AS4 envelope builder
• ✅ Portal upload handler

Chain Integration

• ✅ ChainID 138 connector
• ✅ Trigger registry client
• ✅ Packet registry client

Storage

• ✅ Counterparty profile store
• ✅ Key/certificate management

Interfaces

• ✅ CLI interface (compose, send, verify, profile management)
• ✅ REST API service (Express)

Configuration

Configuration is managed via config/default.json and environment variables:

• RPC_URL - ChainID 138 RPC endpoint
• PRIVATE_KEY - Private key for signing transactions
• PACKET_REGISTRY - PacketRegistry contract address
• TRIGGER_REGISTRY - RailTriggerRegistry contract address

Usage

CLI

# Compose packet from trigger
rbc compose <triggerId>

# Send packet
rbc send <instructionId> --mode email --profile <profileId>

# Verify packet
rbc verify <instructionId>

# List profiles
rbc profile list

API

# Start API server
npm run start:api

# Compose packet
POST /api/v1/compose
{
  "triggerId": 12345
}

# Send packet
POST /api/v1/send
{
  "instructionId": "ABC-2025-000001",
  "mode": "email",
  "profileId": "counterparty1"
}

Next Steps

1. Deploy PacketRegistry contract to ChainID 138
2. Configure contract addresses in config/default.json
3. Set up counterparty profiles
4. Test end-to-end flow
5. Add production email/AS4 integrations (currently placeholders)

Notes

• Some transport modules contain placeholder implementations that need production integration
• PDF signing uses simplified PAdES (full implementation may require additional libraries)
• AS4 XML signing is simplified (full XMLDSig implementation needed for production)