# Shared Modules

This folder contains modules used by both main and renderer processes.

## Files

### security-core.js
Enterprise-grade security system with comprehensive protection.

## Features

### 1. Input Validation
- Path traversal detection
- Malicious pattern checking
- Length validation

### 2. Path Safety
- Forbidden directory protection (Windows, System, etc.)
- Whitelist validation
- Workspace folder support

### 3. Symlink Protection
- Symlink detection
- Circular reference prevention
- Depth limiting

### 4. File Validation
- Extension whitelist
- Size limits (min/max)
- Content verification

### 5. Integrity Verification
- SHA-256 hash calculation
- File tampering detection
- Cache management

### 6. Rate Limiting
- Operation throttling
- Time-window based limits
- Abuse prevention

### 7. ReDoS Protection
- Regex timeout enforcement
- Pattern execution monitoring
- Safe regex execution

## Usage

```javascript
import { SecurityManager } from './security-core.js';

const security = new SecurityManager({
  MAX_FILE_SIZE: 10 * 1024 * 1024,
  ALLOWED_EXTENSIONS: ['.js', '.ts', '.py'],
  EXTRA_ALLOWED_DIRS: ['/path/to/allowed/dir']
});

// Validate and read file
const result = await security.secureReadFile(filePath);

// Get statistics
const stats = security.getSecurityStats();

// Export audit log
const log = security.exportSecurityLog();
```

## Custom Error Classes

- `SecurityError` - Base security error
- `PathTraversalError` - Path attack detected
- `SymlinkError` - Symlink violation
- `FileValidationError` - File validation failed
- `ReDoSError` - Regex timeout
- `RateLimitError` - Rate limit exceeded

## Configuration

All security settings are configurable:

```javascript
const SECURITY_CONFIG = {
  MAX_PATH_LENGTH: 260,
  MAX_FILE_SIZE: 10 * 1024 * 1024,
  ALLOWED_EXTENSIONS: [...],
  FORBIDDEN_PATHS: [...],
  MAX_OPERATIONS_PER_MINUTE: 500,
  // ... more settings
};
```

## Adding New Validations

1. Create validation method in SecurityManager class
2. Add to validateFile() pipeline
3. Add custom error class if needed
4. Update configuration