CODE_REVIEW_RECOMMENDATIONS.md•3.96 kB
# Code Review Recommendations
This document summarizes the key recommendations from the thorough code review of the `@/src` directory. The codebase is well-structured, robust, and demonstrates excellent software engineering practices. The following suggestions are aimed at further refining this high-quality project.
---
## High-Level Summary
- **Overall Quality:** Excellent. The project exhibits a clean three-layer architecture, strong typing with TypeScript and Zod, and robust, reusable utilities for logging and rate-limiting.
- **Strengths:**
- Clear separation of concerns (Server -> Services -> Repositories).
- Effective use of dependency injection.
- Comprehensive input validation and error handling.
- Production-grade logging and utility services.
---
## Specific Recommendations
### 1. Enhance Type Safety in `server.ts`
**File:** `src/server.ts`
**Recommendation:**
In the tool handler methods (e.g., `handleListObjects`, `handleCreateObject`), avoid using `any` for the `query` and `data` objects that are passed to the service layer. Instead, import and use the specific data types defined in the repository files to improve internal type safety.
**Example (`handleListObjects`):**
```typescript
// src/server.ts
// Import the specific type from the repository
import { ListObjectsQuery } from './repositories/object.repository.js';
// ...
class CosmicMCPServer {
// ...
private async handleListObjects(input: ListObjectsInput): Promise<unknown> {
// Use the imported type instead of 'any'
const query: ListObjectsQuery = {
status: input.status,
limit: input.limit,
skip: input.skip,
sort: input.sort,
typeSlug: input.type_slug,
locale: input.locale,
};
return await this.objectService.listObjects(query);
}
// ...
}
```
### 2. ⚠️ Security: Improve MIME Type Validation in `media.service.ts`
**File:** `src/services/media.service.ts`
**Recommendation:**
The current implementation determines a file's MIME type based on its filename extension (`getMimeTypeFromFilename`). This is not secure, as a malicious user could upload a harmful script renamed with an image extension (e.g., `virus.sh` renamed to `virus.png`).
The validation should be performed based on the file's actual contents (its "magic bytes"). The `file-type` library is excellent for this.
**Example Implementation:**
1. **Add the dependency:**
```bash
bun add file-type
```
2. **Update the service:**
```typescript
// src/services/media.service.ts
import { fileTypeFromBuffer } from 'file-type';
import { ValidationError } from '../errors/base.error';
// ... other imports
export class MediaService {
// ...
async uploadMedia(data: CreateMediaData): Promise<CosmicMedia> {
this.logger.info('Uploading media', {
filename: data.filename,
folder: data.folder,
});
// Rate limiting
defaultRateLimiter.checkAndConsume('upload_media');
// Business rules validation
this.validateFileData(data.fileData);
this.validateFilename(data.filename);
const buffer = Buffer.from(data.fileData, 'base64');
this.validateFileSize(buffer); // Pass buffer instead of base64 string
// Securely determine MIME type from buffer
const fileType = await fileTypeFromBuffer(buffer);
const mimeType = fileType?.mime || 'application/octet-stream'; // Fallback
this.validateMimeType(mimeType);
// ... rest of the method
}
// ...
private validateFileSize(buffer: Buffer): void {
if (buffer.length > this.MAX_FILE_SIZE) {
// ... error handling
}
}
// The getMimeTypeFromFilename method can now be removed.
}
```
---
By implementing these suggestions, you will further enhance the security and maintainability of this already excellent application.