Update Dec. 5th#121
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Deodat-Lawson merged 12 commits intostablefrom Dec 14, 2025
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This PR significantly improves the accessibility of the chat interface by adding comprehensive ARIA labels, implementing keyboard shortcuts, and enhancing screen reader support. ## Changes ### ARIA Labels & Screen Reader Support **Chat Container** - Added `role="region"` and `aria-label` to main chat interface - Added `role="log"` with `aria-live="polite"` to message container for dynamic message announcements - Added `role="status"` with `aria-live="polite"` to loading indicator **Interactive Elements** - Added `aria-label` to all buttons (upvote, downvote, tools, send) - Added `aria-hidden="true"` to decorative icons - Added `type="button"` to prevent form submission on action buttons - Added `role="group"` with `aria-label` to message action buttons - Added `role="menu"` and `role="menuitem"` to tools dropdown - Added `aria-expanded` and `aria-haspopup` to tools toggle button **Form & Input** - Added `aria-label` to form and textarea - Added `aria-multiline="true"` to textarea - Added `role="alert"` with `aria-live="assertive"` to error messages - Enhanced placeholder text with keyboard shortcut hints ### Keyboard Navigation **Escape Key** - Press `Escape` to close the tools menu when open - Press `Escape` to clear the input field when tools menu is closed - Auto-focuses textarea after clearing **Enter Key** - Existing: Send message with `Enter` (Shift+Enter for new line) - Now properly documented in UI with tooltip ### UX Improvements - Fixed textarea overflow by changing from `overflow: hidden` to `overflow-y: auto` - Enhanced tooltips with keyboard shortcut information - Improved placeholder text to include "(Press Escape to clear)" - Better visual feedback for screen reader users ## Testing Tested with: - ✅ VoiceOver (macOS) - All interactive elements properly announced - ✅ Keyboard-only navigation - All features accessible without mouse - ✅ NVDA screen reader simulation - Proper role and state announcements - ✅ Chrome DevTools Accessibility Inspector - No violations detected - ✅ Manual keyboard testing - Escape and Enter shortcuts working correctly ## Accessibility Standards This PR follows WCAG 2.1 Level AA guidelines: - **1.3.1 Info and Relationships**: Proper semantic structure with ARIA - **2.1.1 Keyboard**: Full keyboard accessibility - **4.1.2 Name, Role, Value**: All UI components properly labeled ## Impact These improvements make the chat interface: - Fully navigable with keyboard only - Compatible with screen readers - More discoverable for all users (keyboard shortcuts in UI) - Compliant with modern accessibility standards No breaking changes - purely additive accessibility enhancements.
Implemented a comprehensive rate limiting system to protect against API abuse and control costs for expensive AI operations. Features: - Token bucket algorithm for smooth rate limiting - In-memory store with automatic cleanup - Standard rate limit headers (X-RateLimit-*) - Multiple rate limit presets (standard, strict, permissive, burst) - IP-based rate limiting with support for various proxy headers - Custom key generators and skip functions - Comprehensive test coverage Applied rate limiting to: - /api/AIAssistant (20 req/15min) - AI chat with embeddings - /api/uploadDocument (20 req/15min) - Document upload with OCR - /api/predictive-document-analysis (20 req/15min) - AI analysis Benefits: - Protects against API cost overruns - Prevents abuse and DoS attacks - Professional API design with standard headers - Easy to extend with Redis for distributed systems Technical implementation: - src/lib/rate-limiter.ts: Core rate limiting logic - src/lib/rate-limit-middleware.ts: Next.js middleware helpers - Comprehensive unit tests for both modules - Clean integration with existing API routes
…a-into-multiple-files Split Drizzle schema into modular files
…ents Enhance accessibility with ARIA labels and keyboard navigation
Add API rate limiting for expensive operations
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