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VALIDATION_IMPLEMENTATION.md

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Request Validation Implementation Summary

Overview

Comprehensive request validation has been implemented across all API endpoints to ensure data integrity, security, and consistent error handling.

Files Created

1. Core Validation Utilities

File: src/utils/validators.js

Provides reusable validation functions:

  • isValidStellarPublicKey() - Validates Stellar public key format (G + 56 chars)
  • isValidStellarSecretKey() - Validates Stellar secret key format (S + 56 chars)
  • isValidAmount() - Ensures amount is positive and > 0
  • isValidTransactionHash() - Validates 64-character hex strings
  • isValidDate() - Validates ISO date format
  • isValidDateRange() - Validates date range logic
  • walletExists() - Checks if wallet ID exists in database
  • walletAddressExists() - Checks if wallet address exists
  • transactionExists() - Checks if transaction ID exists
  • sanitizeString() - Trims and sanitizes string input

2. Validation Middleware

File: src/middleware/validation.js

Express middleware functions for route protection:

  • validateDonationCreate - Validates donation creation requests
  • validateTransactionVerify - Validates transaction verification requests
  • validateDateRange - Validates date range query parameters
  • validateWalletCreate - Validates wallet creation requests
  • validateWalletId - Validates wallet ID parameters
  • validatePublicKey() - Flexible public key validator

3. Test Suites

Files:

  • tests/validation.test.js - Unit tests for validation utilities
  • tests/validation-middleware.test.js - Integration tests for middleware

Comprehensive test coverage including:

  • Valid input acceptance
  • Invalid input rejection
  • Edge cases (zero, negative, null, undefined)
  • Format validation
  • Business logic validation

4. Documentation

Files:

  • VALIDATION.md - Complete validation documentation
  • VALIDATION_QUICK_REFERENCE.md - Quick reference guide

Files Modified

1. Donation Routes (src/routes/donation.js)

Changes:

  • Added validation middleware to POST /donations
  • Added validation middleware to POST /donations/verify
  • Improved error response format with error codes
  • Standardized success/error response structure

Endpoints Updated:

  • POST /donations - Validates amount, donor, recipient
  • POST /donations/verify - Validates transaction hash
  • GET /donations/:id - Enhanced error handling

2. Stats Routes (src/routes/stats.js)

Changes:

  • Added validateDateRange middleware to all endpoints
  • Removed duplicate validation code
  • Standardized error responses
  • Improved error codes

Endpoints Updated:

  • GET /stats/daily
  • GET /stats/weekly
  • GET /stats/summary
  • GET /stats/donors
  • GET /stats/recipients

3. Wallet Routes (src/routes/wallet.js)

Changes:

  • Created complete wallet management endpoints
  • Added comprehensive validation
  • Implemented duplicate prevention

Endpoints Created:

  • POST /wallets - Create wallet with validation
  • GET /wallets - List all wallets
  • GET /wallets/:id - Get wallet by ID with validation
  • POST /wallets/lookup - Lookup wallet by address

4. Application Setup (src/routes/app.js)

Changes:

  • Added wallet routes to application
  • Integrated new validation middleware

5. Configuration (src/config/stellar.js)

Changes:

  • Added dbPath configuration
  • Added network configuration
  • Added port configuration

6. Package Configuration (package.json)

Changes:

  • Added test scripts (test, test:watch, test:coverage)
  • Added jest and supertest as dev dependencies

Validation Rules Implemented

✅ Amount Validation

  • Must be a positive number
  • Must be greater than 0
  • Rejects NaN, Infinity, negative values

✅ Stellar Address Validation

  • Must start with 'G' (public key)
  • Must be exactly 56 characters
  • Must contain only valid base32 characters (A-Z, 2-7)

✅ Transaction Hash Validation

  • Must be exactly 64 characters
  • Must contain only hexadecimal characters

✅ Date Range Validation

  • Both dates required
  • Must be valid ISO format
  • Start date must be before or equal to end date

✅ Wallet ID Validation

  • Must exist in database
  • Returns 404 if not found

✅ Business Logic Validation

  • Donor and recipient must be different
  • Duplicate wallet addresses prevented
  • Clear error messages for all violations

Error Response Format

All validation errors follow a consistent structure:

{
  "success": false,
  "error": {
    "code": "ERROR_CODE",
    "message": "Human-readable error message",
    "field": "fieldName"
  }
}

Error Codes Implemented

  • MISSING_FIELD - Required field not provided
  • MISSING_PARAMETER - URL parameter missing
  • MISSING_PARAMETERS - Query parameters missing
  • INVALID_AMOUNT - Amount validation failed
  • INVALID_STELLAR_ADDRESS - Invalid Stellar address format
  • INVALID_TRANSACTION_HASH - Invalid hash format
  • INVALID_DATE_RANGE - Invalid date range
  • INVALID_TRANSACTION - Business logic violation
  • WALLET_NOT_FOUND - Wallet doesn't exist (404)
  • DONATION_NOT_FOUND - Donation doesn't exist (404)
  • WALLET_EXISTS - Duplicate wallet (409)

Testing

Test Coverage

  • Unit tests for all validation functions
  • Integration tests for all middleware
  • Edge case testing
  • Error response validation

Running Tests

npm test                                    # Run all tests
npm test -- tests/validation.test.js       # Unit tests only
npm test -- tests/validation-middleware.test.js  # Integration tests
npm test:coverage                          # With coverage report

Security Improvements

  1. Input Sanitization - All strings trimmed and validated
  2. Type Safety - Strict type checking prevents coercion attacks
  3. Format Validation - Regex patterns ensure correct formats
  4. Existence Checks - Database lookups verify resources exist
  5. Duplicate Prevention - Prevents duplicate wallet registrations
  6. Clear Error Messages - Helps developers without exposing internals

Acceptance Criteria Met

✅ Amount must be > 0

  • Implemented in isValidAmount() validator
  • Applied to all donation endpoints
  • Clear error messages returned

✅ Wallet IDs must exist

  • Implemented in walletExists() validator
  • Applied to wallet lookup endpoints
  • Returns 404 with clear message

✅ Public keys must be valid Stellar addresses

  • Implemented in isValidStellarPublicKey() validator
  • Applied to all endpoints accepting addresses
  • Validates format (G + 56 chars, base32)

✅ Return clear error messages

  • Standardized error response format
  • Specific error codes for each validation type
  • Field-level error identification
  • Human-readable messages

Usage Examples

Valid Request

curl -X POST http://localhost:3000/donations \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 10.5,
    "recipient": "GBRPYHIL2CI3FNQ4BXLFMNDLFJUNPU2HY3ZMFSHONUCEOASW7QC7OX2H"
  }'

Invalid Amount Response

{
  "success": false,
  "error": {
    "code": "INVALID_AMOUNT",
    "message": "Amount must be a positive number greater than 0",
    "field": "amount"
  }
}

Invalid Stellar Address Response

{
  "success": false,
  "error": {
    "code": "INVALID_STELLAR_ADDRESS",
    "message": "Invalid Stellar public key format. Must start with G and be 56 characters",
    "field": "recipient"
  }
}

Next Steps

To use the validation:

  1. Install dependencies:

    npm install

  2. Run tests:

    npm test

  3. Start the server:

    npm start

  4. Test endpoints:

    • Use the examples in VALIDATION.md
    • Try invalid inputs to see error responses
    • Check VALIDATION_QUICK_REFERENCE.md for patterns

Benefits

  1. Data Integrity - Invalid data rejected before processing
  2. Security - Prevents injection and malformed requests
  3. Developer Experience - Clear, actionable error messages
  4. Maintainability - Centralized validation logic
  5. Testability - Comprehensive test coverage
  6. Consistency - Uniform error handling across all endpoints