Stellar Bridge Adapter Implementation

[OthmanImam]

Closes: #3

Title

feat: Implement Stellar bridge adapter with Freighter wallet and Soroban integration

Description

Overview

This PR introduces @bridgewise/stellar-adapter, a production-ready Stellar/Soroban bridge adapter package that enables seamless integration of Freighter wallet and Soroban smart contract interactions for bridge operations.

Problem Statement

The BridgeWise platform needed first-class support for the Stellar ecosystem with:

• Freighter wallet integration for secure account management
• Low-latency bridge transaction execution on Soroban
• Comprehensive fee estimation and network awareness
• Type-safe operations with full TypeScript support

Solution

Created a dedicated adapter package with three core modules:

1. FreighterProvider - Handles wallet connection, signing, and balance queries
2. BridgeContract - Manages Soroban contract interactions and fee estimation
3. StellarBridgeExecutor - Orchestrates complete bridge transfer flow

Changes Made

New Package: packages/adapters/stellar

Core Implementation (3 modules, 845 lines)

• FreighterProvider.ts (264 lines)

  • Freighter wallet detection and connection
  • Account balance querying
  • Transaction signing with hash generation
  • Message signing capability
  • Full error handling and recovery

• BridgeContract.ts (268 lines)

  • Soroban contract interface
  • Bridge transfer preparation
  • RPC-based transaction submission
  • Dynamic fee estimation (network + bridge fees)
  • Operation status querying

• BridgeExecutor.ts (313 lines)

  • Main executeTransfer() entry point
  • Complete transfer pipeline (connect → validate → sign → submit)
  • Parameter validation (amount, address format, chain)
  • Cost estimation with fee breakdown
  • Real-time network statistics

Testing (434 lines)

• 30+ comprehensive test cases with full mocking
• FreighterProvider: 8 tests
• BridgeContract: 2 tests
• BridgeExecutor: 9+ tests
• Error scenarios: 5+ tests
• Edge cases: 6+ tests
• Jest configuration with ts-jest preset

Documentation (1,487 lines)

• README.md - Complete API reference with examples
• EXAMPLES.md - 5 detailed usage scenarios
• IMPLEMENTATION_COMPLETE.md - Technical architecture and performance
• FILE_MANIFEST.md - File inventory and statistics
• STELLAR_ADAPTER_SUMMARY.md - Quick reference guide

Configuration

• package.json - Dependencies and build scripts
• tsconfig.json - TypeScript configuration (ES2020, strict mode)
• jest.config.js - Test runner configuration
• index.ts - Public API exports with factory function

Key Features

✅ Freighter Wallet Integration

const provider = new FreighterProvider();
const wallet = await provider.connectWallet('mainnet');
const balance = await provider.getBalance();
const signed = await provider.signTransaction(envelope);

✅ Bridge Transaction Execution

const executor = new StellarBridgeExecutor(wallet, contract);
const result = await executor.executeTransfer({
  sourceChain: 'stellar',
  targetChain: 'ethereum',
  sourceAmount: '1000000000',
  destinationAmount: '0.5',
  recipient: 'GBUQWP3...',
  fee: '1000',
  estimatedTime: 30
}, { slippage: 100 });

✅ Fee Estimation

• Network fee calculation
• Bridge fee (0.1% of amount)
• Total cost breakdown
• Gas estimation for Soroban

✅ Network Awareness

• Real-time base fee queries
• Average block time estimation
• Pending transaction tracking
• Graceful fallbacks for RPC failures

✅ Error Handling

• Comprehensive error codes
• User-friendly error messages
• Validation for addresses and amounts
• Wallet connectivity checks

Testing

Test Coverage

• Total Test Cases: 30+
• Coverage Target: 70%+
• Approach: Mocked Freighter API for isolation
• Status: Ready for CI/CD integration

Test Execution

npm test  # Run all tests
npm test -- --coverage  # Generate coverage report

Dependencies Added

• @stellar/stellar-sdk@^13.3.0 - Stellar SDK
• axios@^1.13.2 - HTTP client for RPC
• @types/node@^20.0.0 - Node.js types
• jest@^30.0.0 - Test runner (dev)
• ts-jest@^29.0.0 - TypeScript support for Jest (dev)

Breaking Changes

None - this is a new package with no impact to existing code.

Checklist

• Code follows project style guidelines
• Self-review completed
• Comments added for complex logic
• Documentation updated
• Tests added and passing
• No new console warnings/errors
• No unrelated changes included
• Stellar adapter builds with zero errors

Related Issues

• Closes feat/AdaptaBridge
• Implements Stellar/Soroban bridge support
• Enables Freighter wallet integration

Performance Impact

• ✅ No impact to existing packages
• ✅ Low-latency transfer execution (optimized async flow)
• ✅ Network-aware fee estimation
• ✅ Efficient connection pooling

Deployment Notes

Prerequisites

• Node.js 18+
• Freighter wallet browser extension installed

Installation

npm install @bridgewise/stellar-adapter

Quick Start

import { createStellarAdapter } from '@bridgewise/stellar-adapter';

const adapter = createStellarAdapter(
  'https://soroban-rpc.mainnet.stellar.org',
  'https://horizon.stellar.org',
  'CONTRACT_ID',
  'mainnet'
);

const result = await adapter.executeTransfer(transferDetails);

Next Steps

1. Merge and tag as v0.1.0
2. Integrate with bridge-core for shared type usage
3. Frontend React components (Phase 2)
4. API endpoints for bridge operations (Phase 3)

Reviewers Notes

• Freighter Integration: Uses browser-based wallet API, no private key exposure
• Fee Estimation: Dynamically calculated based on network state
• Error Handling: Graceful degradation with user-friendly messages
• Documentation: Comprehensive with 5 examples and troubleshooting guide
• Testing: 30+ test cases covering happy path and error scenarios

---

Branch: feat/AdaptaBrige
Package: @bridgewise/stellar-adapter@0.1.0
Status: ✅ Ready for Review and Merge