Frontend Validation:
- Created Validator class with comprehensive validation methods
- HTML sanitization to prevent XSS attacks
- Text sanitization removing dangerous characters
- Language code validation against allowed list
- Audio file validation (size, type, extension)
- URL validation preventing injection attacks
- API key format validation
- Request size validation
- Filename sanitization
- Settings validation with type checking
- Cache key sanitization
- Client-side rate limiting tracking
Backend Validation:
- Created validators.py module for server-side validation
- Audio file validation with size and type checks
- Text sanitization with length limits
- Language code validation
- URL and API key validation
- JSON request size validation
- Rate limiting per endpoint (30 req/min)
- Added validation to all API endpoints
- Error boundary decorators on all routes
- CSRF token support ready
Security Features:
- Prevents XSS through HTML escaping
- Prevents SQL injection through input sanitization
- Prevents directory traversal in filenames
- Prevents oversized requests (DoS protection)
- Rate limiting prevents abuse
- Type checking prevents type confusion attacks
- Length limits prevent memory exhaustion
- Character filtering prevents control character injection
All user inputs are now validated and sanitized before processing.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Implemented TranslationCache class with IndexedDB storage
- Cache translations automatically with 30-day expiration
- Added cache management UI in settings modal
- Shows cache count and size
- Toggle to enable/disable caching
- Clear cache button
- Check cache first before API calls (when enabled)
- Automatic cleanup when reaching 1000 entries limit
- Show "(cached)" indicator for cached translations
- Works completely offline after translations are cached
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
