SOLUTION_ISSUE_125.md

Solution for Issue #125

🛠️ Proposed Solution (by Aditya Waghamare)

Analysis

The codebase lacks test coverage for CORS origin rejection in src/config/cors.ts (and corresponding Express/Fastify/NestJS middleware integration). Specifically, when an invalid origin hits the API, the current behavior (or intended corrected behavior) needs to be tested for both disallowed origins and server-to-server requests without an origin.

Fix

Add comprehensive integration/unit tests for CORS rejection behavior covering:

1. Disallowed origin header -> verifying status code and body response.
2. Absent Origin header (server-to-server / curl) -> verifying allowed behavior or expected handling.

Implementation

```typescript import request from 'supertest'; import { app } from '../src/app'; // Assuming Express app export

describe('CORS Origin Rejection Behavior', () => { const disallowedOrigin = 'https://malicious-origin.com'; const allowedOrigin = process.env.CORS_ORIGINS?.split(',')[0] || 'http://localhost:3000';

it('should reject requests with a disallowed Origin header', async () => { const response = await request(app) .get('/health') // or any standard endpoint .set('Origin', disallowedOrigin);

// Asserting the status code and error response body
// Depending on whether errorHandler catches it as 500 or 403 (as per issue context)
expect([403, 500]).toContain(response.status);
expect(response.body).toHaveProperty('message');

});

it('should allow requests without an Origin header (server-to-server / curl)', async () => { const response = await request(app) .get('/health');

// Server-to-server requests without Origin header should pass CORS check
expect(response.status).not.toBe(403);
expect(response.status).not.toBe(500);

}); }); ```

Testing

Run tests using: ```bash npm test ```

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Submitted by Aditya Waghamare 💰 Payout Address (Base L2 / EVM): 0xb61dBcdBc3407F71EaCb64D4CBFAcf9FFfe2415C