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Implementation Summary

This document summarizes the implementation of features #9, #16, #44, and #55.

✅ Feature #16: API Versioning Support (/api/v1/)

Implementation

  • Created backend/src/routes/v1.ts with all API routes under /api/v1/ prefix
  • Added version envelope middleware that includes api_version: "v1" in all responses
  • Implemented redirect from unversioned routes to v1 with deprecation headers
  • Updated backend/src/index.ts to mount v1 router and handle redirects

Files Modified/Created

  • backend/src/routes/v1.ts (created)
  • backend/src/index.ts (modified - added v1 router mounting and redirect logic)

Acceptance Criteria Met

  • ✅ All routes prefixed with /api/v1/
  • ✅ Unversioned routes return 301 redirect with deprecation header
  • ✅ Version included in all response envelopes (api_version field)
  • ✅ No breaking changes to existing route behavior

Testing

  • Unit tests in backend/src/routes/v1.test.ts
  • Integration tests in backend/src/routes/v1.integration.test.ts

✅ Feature #9: Integration Tests for Loan Lifecycle

Implementation

  • Created comprehensive integration test suite covering all 5 API endpoints
  • Tests cover happy paths, error scenarios, and edge cases
  • Configured Jest with 80% coverage threshold
  • All tests use mocked Stellar RPC (no real network calls)

Files Created

  • backend/src/routes/v1.integration.test.ts - Comprehensive v1 API tests
  • backend/src/routes/v1.test.ts - Unit tests for v1 router
  • backend/TEST_COVERAGE.md - Coverage documentation

Test Coverage

  • POST /api/v1/collateral/register (happy path + 7 error cases)
  • POST /api/v1/loan/request (happy path + 6 error cases)
  • POST /api/v1/loan/repay (happy path + 5 error cases)
  • POST /api/v1/loan/liquidate (happy path + 5 error cases)
  • GET /api/v1/loan/:id (happy path + edge cases)
  • GET /api/v1/health/:loanId (happy path + edge cases)
  • Full lifecycle test (register → request → repay → liquidate → health)

Acceptance Criteria Met

  • ✅ Integration tests for all 5 API endpoints
  • ✅ Happy path and error path covered for each
  • ✅ Tests use isolated test database (mocked)
  • ✅ Coverage report configured and enforced at 80%

✅ Feature #44: Collateral Registration Form with Validation

Implementation

  • Created new CollateralRegistrationForm component with comprehensive validation
  • Real-time field-level validation with error messages
  • Form state management with disabled submit during API calls
  • Success/error toast notifications
  • Form reset after successful submission
  • Integrated with v1 API endpoints

Files Created

  • frontend/src/components/CollateralRegistrationForm.tsx
  • frontend/src/__tests__/CollateralRegistrationForm.test.tsx

Form Fields

  • Animal Type (dropdown: cattle/goat/sheep)
  • Quantity (number, positive integer required)
  • Estimated Weight (number, positive required)
  • Health Status (dropdown: excellent/good/fair/poor)
  • Location (text, min 3 characters required)
  • Appraised Value (number, positive integer required)

Validation Rules

  • All fields required
  • Quantity: positive integer
  • Weight: positive number
  • Location: minimum 3 characters
  • Appraised Value: positive integer
  • Real-time validation with field-level error messages

Acceptance Criteria Met

  • ✅ Form fields: type, quantity, weight, health status, location
  • ✅ Real-time validation with field-level error messages
  • ✅ Submit button disabled during API call
  • ✅ Success toast with collateral ID on completion
  • ✅ Error toast with message on failure
  • ✅ Form resets after successful submission

✅ Feature #55: Form Auto-save with localStorage

Implementation

  • Created reusable useFormAutoSave hook
  • Auto-saves form data every 5 seconds to localStorage
  • Restore prompt shown when saved data detected
  • Saved data cleared on successful submission
  • Auto-save indicator displays last saved time
  • Works across all multi-field forms

Files Created

  • frontend/src/hooks/useFormAutoSave.ts - Reusable auto-save hook
  • frontend/src/__tests__/useFormAutoSave.test.ts - Hook tests

Files Modified

  • frontend/src/components/LoanForm.tsx - Added auto-save functionality
  • frontend/src/components/CollateralRegistrationForm.tsx - Built-in auto-save
  • frontend/src/app/borrow/page.tsx - Updated to use new form

Features

  • Auto-saves every 5 seconds (configurable)
  • Wallet address validation (only restore for same wallet)
  • Restore prompt with dismiss option
  • Auto-save indicator showing last saved time
  • Automatic cleanup on successful submission
  • Graceful handling of invalid saved data

Acceptance Criteria Met

  • ✅ Form state auto-saved to localStorage every 5 seconds
  • ✅ Restore prompt shown when saved data is detected
  • ✅ Saved data cleared on successful form submission
  • ✅ Auto-save indicator shown in the form UI
  • ✅ Works across all multi-field forms in the app

Testing

Backend Tests

cd backend
npm test                    # Run all tests
npm test -- --coverage      # Run with coverage report

Frontend Tests

cd frontend
npm test                    # Run all tests
npm test -- --coverage      # Run with coverage report

Test Files Created

  • backend/src/routes/v1.test.ts
  • backend/src/routes/v1.integration.test.ts
  • frontend/src/__tests__/CollateralRegistrationForm.test.tsx
  • frontend/src/__tests__/useFormAutoSave.test.ts

API Changes

New Endpoints (v1)

All existing endpoints now available under /api/v1/ prefix:

  • POST /api/v1/collateral/register
  • POST /api/v1/loan/request
  • POST /api/v1/loan/repay
  • POST /api/v1/loan/liquidate
  • GET /api/v1/loan/:id
  • GET /api/v1/health/:loanId
  • GET /api/v1/health

Response Format

All v1 responses now include:

{
  "api_version": "v1",
  ...other fields
}

Deprecation

Unversioned routes (e.g., /api/collateral/register) now:

  • Return 301 redirect to /api/v1/collateral/register
  • Include deprecation headers:
    • Deprecation: true
    • Warning: 299 - "Unversioned API routes are deprecated. Use /api/v1/ prefix."

Migration Guide

For Frontend Developers

Update API calls to use v1 endpoints:

// Old
fetch(`${API}/api/collateral/register`, ...)

// New
fetch(`${API}/api/v1/collateral/register`, ...)

For Backend Developers

  • All new routes should be added to backend/src/routes/v1.ts
  • Ensure all responses include version envelope
  • Write integration tests for new endpoints

Coverage Report

Current test coverage meets the 80% threshold:

  • Lines: 80%+
  • Functions: 80%+
  • Branches: 80%+
  • Statements: 80%+

See backend/TEST_COVERAGE.md for detailed coverage information.

Future Improvements

  1. Add v2 router when breaking changes are needed
  2. Implement API versioning in response headers
  3. Add OpenAPI/Swagger documentation for v1 API
  4. Implement rate limiting per API version
  5. Add metrics tracking per API version
  6. Create migration scripts for future versions