feat: implement QR code check-in system for event attendees

- Add UserQRCode component to display unique QR code on user profile - Add QRCodeScanner component for mobile camera-based scanning - Create EventCheckInPage for organizers to scan attendee QR codes - Add backend endpoint POST /api/events/:id/checkin for check-in - Add check-in button to EventDetailModal for organizers - Install qrcode.react and html5-qrcode dependencies - Implement real-time attendee list updates - Add organizer permission validation - Prevent duplicate check-ins - Mobile-optimized with back camera support
2025-11-20 18:52:04 +00:00
parent cbafe85694
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+# QR Code Check-In System Implementation
+
+## Overview
+
+Implemented a QR code-based check-in system for event attendees. Event organizers can scan attendee QR codes from their mobile devices to track attendance at cleanup events.
+
+## Features
+
+### 1. User QR Code Display
+- **Location**: User Profile Page (Overview tab)
+- **Component**: `UserQRCode` (`src/components/user/UserQRCode.tsx`)
+- Each user has a unique QR code containing their Clerk user ID
+- QR code is displayed prominently on their profile for easy access
+- Users can show this QR code to event organizers for check-in
+
+### 2. QR Code Scanner
+- **Component**: `QRCodeScanner` (`src/components/event/QRCodeScanner.tsx`)
+- Uses `html5-qrcode` library for camera-based scanning
+- Mobile-optimized with back camera support
+- Real-time scanning with visual feedback
+- Error handling for invalid QR codes
+
+### 3. Event Check-In Page
+- **Route**: `/events/:eventId/checkin`
+- **Component**: `EventCheckInPage` (`src/pages/EventCheckInPage.tsx`)
+- **Access**: Only event organizers can access
+- Features:
+  - Live QR code scanner
+  - List of registered attendees
+  - Visual indication of checked-in attendees
+  - Real-time updates after successful check-in
+  - Success/error notifications
+
+### 4. Backend API
+- **Endpoint**: `POST /api/events/:id/checkin`
+- **Controller**: `eventController.checkInAttendee`
+- **Service**: `eventService.checkInAttendee`
+- Validates:
+  - User is the event organizer
+  - Attendee is registered for the event
+  - Attendee hasn't already checked in
+- Returns attendee information on successful check-in
+
+## User Flow
+
+### For Attendees:
+1. Navigate to their profile page
+2. View their personal QR code in the Overview tab
+3. Show QR code to event organizer at the event
+
+### For Organizers:
+1. Navigate to their event details
+2. Click "QR Code Check-In" button
+3. Grant camera permissions
+4. Click "Start Scanning"
+5. Point camera at attendee's QR code
+6. System automatically checks in the attendee
+7. Visual confirmation and attendee list updates
+
+## Technical Implementation
+
+### Dependencies Added:
+```json
+{
+  "qrcode.react": "^3.x.x",
+  "html5-qrcode": "^2.x.x",
+  "@types/qrcode.react": "^1.x.x"
+}
+```
+
+### QR Code Data Format:
+```json
+{
+  "userId": "clerk_user_id",
+  "type": "attendee-checkin",
+  "timestamp": 1234567890
+}
+```
+
+### Key Components:
+
+1. **UserQRCode.tsx**
+   - Generates QR code using `qrcode.react`
+   - High error correction level (H)
+   - 200x200px size with margin
+   - Displays user's name below QR code
+
+2. **QRCodeScanner.tsx**
+   - Uses Html5Qrcode for camera access
+   - 250x250px scanning box
+   - 10 FPS scanning rate
+   - Parses and validates QR code data
+   - Callbacks for successful scan and errors
+
+3. **EventCheckInPage.tsx**
+   - Fetches event and attendee data
+   - Verifies organizer permissions
+   - Manages scanner state
+   - Handles check-in API calls
+   - Updates UI in real-time
+
+### Backend Changes:
+
+1. **eventController.ts**
+   - Added `checkInAttendee` method
+   - Validates organizer permissions
+   - Finds or creates user from Clerk ID
+   - Calls service layer for check-in
+
+2. **eventService.ts**
+   - Added `checkInAttendee` method
+   - Validates registration status
+   - Prevents duplicate check-ins
+   - Updates attendance record
+
+3. **eventRoutes.ts**
+   - Added `POST /:id/checkin` route
+   - Protected with `requireAuth` middleware
+
+## UI/UX Enhancements
+
+### User Profile:
+- QR code card with clear instructions
+- Prominent placement in Overview tab
+- User identification below QR code
+
+### Check-In Page:
+- Mobile-responsive design
+- Large, easy-to-use scanner interface
+- Clear start/stop buttons
+- Real-time attendee list with check-in status
+- Color-coded status indicators (green for checked in)
+- Success/error toast notifications
+
+### Event Detail Modal:
+- Added "QR Code Check-In" button for organizers
+- Purple button with QR icon
+- Available before and after event date
+- Navigates to dedicated check-in page
+
+## Security Considerations
+
+1. **Authorization**: Only event organizers can access check-in page
+2. **Validation**: Backend validates all check-in requests
+3. **QR Code Format**: Structured JSON with type validation
+4. **Timestamp**: Included in QR code (not currently validated, but available for future use)
+
+## Mobile Optimization
+
+- Camera access optimized for mobile devices
+- Back camera selected by default
+- Responsive layout for small screens
+- Touch-friendly buttons and controls
+- Large scanning area for easy targeting
+
+## Future Enhancements
+
+1. **Offline Support**: Cache attendee list for offline check-in
+2. **Bulk Check-In**: Allow manual selection of multiple attendees
+3. **Check-In History**: Track check-in timestamps
+4. **QR Code Expiry**: Add time-based validation to QR codes
+5. **Export**: Generate check-in reports
+6. **Notifications**: Send confirmation to attendees upon check-in
+
+## Testing
+
+### Manual Testing Checklist:
+- [ ] User can view their QR code on profile page
+- [ ] QR code scanner requests camera permission
+- [ ] Scanner successfully reads QR codes
+- [ ] Only organizers can access check-in page
+- [ ] Check-in updates attendee status
+- [ ] Duplicate check-ins are prevented
+- [ ] Error messages display correctly
+- [ ] Mobile camera works properly
+- [ ] Attendee list updates in real-time
+
+## Files Modified/Created
+
+### Frontend:
+- `src/components/user/UserQRCode.tsx` (new)
+- `src/components/user/index.ts` (new)
+- `src/components/event/QRCodeScanner.tsx` (new)
+- `src/pages/EventCheckInPage.tsx` (new)
+- `src/pages/UserProfilePage.tsx` (modified)
+- `src/components/event/EventDetailModal.tsx` (modified)
+- `src/App.tsx` (modified)
+- `package.json` (modified)
+
+### Backend:
+- `server/src/controllers/eventController.ts` (modified)
+- `server/src/services/eventService.ts` (modified)
+- `server/src/routes/eventRoutes.ts` (modified)
+
+## Deployment Notes
+
+1. Ensure camera permissions are properly configured in production
+2. HTTPS required for camera access in browsers
+3. Test on various mobile devices and browsers
+4. Consider rate limiting for check-in endpoint
+5. Monitor for QR code scanning performance issues
+
+## Support
+
+For issues or questions:
+- Check browser camera permissions
+- Ensure HTTPS is enabled
+- Verify user is registered for the event
+- Check that user is the event organizer
+- Review browser console for errors