Major upgrade: API key authentication, certificate renewal/download endpoints, monitoring/alerting scripts, improved logging, and documentation updates. See UPGRADE_SUMMARY.md for details.

UPGRADE_SUMMARY.md

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+# HAProxy Manager Upgrade Summary
+
+This document summarizes the new features and improvements added to the HAProxy Manager project.
+
+## New Features Implemented
+
+### 1. API Key Authentication
+- **Feature**: Optional API key authentication for all API endpoints
+- **Implementation**: 
+  - Environment variable `HAPROXY_API_KEY` controls authentication
+  - Bearer token authentication using `Authorization: Bearer <key>` header
+  - Health check endpoint (`/health`) and web UI (`/`) remain unauthenticated
+  - Graceful fallback to unauthenticated mode when no API key is set
+- **Security**: All API endpoints (except health check) require authentication when API key is configured
+
+### 2. Certificate Renewal API
+- **Endpoint**: `POST /api/certificates/renew`
+- **Functionality**: 
+  - Triggers renewal of all Let's Encrypt certificates
+  - Automatically updates combined certificate files for HAProxy
+  - Regenerates HAProxy configuration
+  - Reloads HAProxy with new certificates
+  - Returns detailed status of renewal process
+- **Error Handling**: Comprehensive error logging and status reporting
+
+### 3. Certificate Download Endpoints
+- **Endpoints**:
+  - `GET /api/certificates/<domain>/download` - Combined certificate (cert + key)
+  - `GET /api/certificates/<domain>/key` - Private key only
+  - `GET /api/certificates/<domain>/cert` - Certificate only (no private key)
+- **Use Case**: Allow other services to securely download certificates for their own use
+- **Security**: All endpoints require API key authentication
+
+### 4. Certificate Status Monitoring
+- **Endpoint**: `GET /api/certificates/status`
+- **Functionality**:
+  - Lists all certificates with expiration dates
+  - Calculates days until expiration
+  - Provides certificate file paths
+  - Enables proactive certificate management
+
+### 5. Comprehensive Error Logging and Alerting
+- **Logging System**:
+  - Structured JSON logging for all operations
+  - Separate error log file (`/var/log/haproxy-manager-errors.log`)
+  - General application log (`/var/log/haproxy-manager.log`)
+  - Timestamped operation tracking
+- **Alerting Capabilities**:
+  - Error detection and logging
+  - Certificate expiration warnings
+  - HAProxy operation failure tracking
+  - Configurable alerting via monitoring script
+
+## Technical Improvements
+
+### Enhanced Error Handling
+- All API endpoints now include comprehensive error handling
+- Detailed error messages with logging
+- Graceful failure handling for HAProxy operations
+- Certificate operation error tracking
+
+### Improved Logging
+- Structured logging with timestamps
+- Operation success/failure tracking
+- Error categorization and alerting
+- Debug information for troubleshooting
+
+### Better HAProxy Integration
+- Enhanced configuration validation
+- Improved reload/restart handling
+- Better error reporting for HAProxy operations
+- Automatic recovery from configuration errors
+
+## New Scripts and Tools
+
+### 1. Monitoring Script (`scripts/monitor-errors.sh`)
+- **Purpose**: Monitor error logs and certificate expiration
+- **Features**:
+  - Check for recent errors in configurable time windows
+  - Monitor certificate expiration dates
+  - Email and webhook alerting capabilities
+  - Configurable thresholds and intervals
+- **Usage**: Can be integrated with cron for automated monitoring
+
+### 2. API Test Script (`scripts/test-api.sh`)
+- **Purpose**: Test all new API endpoints
+- **Features**:
+  - Comprehensive API endpoint testing
+  - Authentication testing
+  - Colored output for easy reading
+  - Detailed response logging
+
+### 3. Monitoring Configuration (`scripts/monitoring-example.conf`)
+- **Purpose**: Example configuration for monitoring setup
+- **Features**:
+  - Email and webhook configuration examples
+  - Crontab entry examples
+  - Monitoring interval recommendations
+
+## Updated Files
+
+### Core Application
+- `haproxy_manager.py` - Major updates with new endpoints and features
+- `requirements.txt` - No changes needed (existing dependencies sufficient)
+- `Dockerfile` - Added jq package and log directory setup
+
+### Documentation
+- `README.md` - Comprehensive updates with new feature documentation
+- `UPGRADE_SUMMARY.md` - This summary document
+
+### Scripts
+- `scripts/monitor-errors.sh` - New monitoring and alerting script
+- `scripts/test-api.sh` - New API testing script
+- `scripts/monitoring-example.conf` - New monitoring configuration example
+
+## Environment Variables
+
+| Variable | Description | Default | Required |
+|----------|-------------|---------|----------|
+| `HAPROXY_API_KEY` | API key for authentication | None | No (optional) |
+
+## Migration Guide
+
+### For Existing Users
+1. **No Breaking Changes**: Existing functionality remains unchanged
+2. **Optional Authentication**: API key is optional - set `HAPROXY_API_KEY` to enable
+3. **Backward Compatibility**: All existing endpoints work without authentication when no API key is set
+
+### For New Deployments
+1. **Recommended**: Set `HAPROXY_API_KEY` for production deployments
+2. **Monitoring**: Configure monitoring script for automated alerting
+3. **Testing**: Use test script to verify all endpoints work correctly
+
+## API Endpoints Summary
+
+### Existing Endpoints (Updated with Authentication)
+- `GET /health` - Health check (no auth required)
+- `GET /api/domains` - List domains
+- `POST /api/domain` - Add domain
+- `DELETE /api/domain` - Remove domain
+- `POST /api/ssl` - Request SSL certificate
+- `GET /api/regenerate` - Regenerate configuration
+- `GET /api/reload` - Reload HAProxy
+
+### New Endpoints
+- `POST /api/certificates/renew` - Renew all certificates
+- `GET /api/certificates/status` - Get certificate status
+- `GET /api/certificates/<domain>/download` - Download combined certificate
+- `GET /api/certificates/<domain>/key` - Download private key
+- `GET /api/certificates/<domain>/cert` - Download certificate only
+
+## Security Considerations
+
+1. **API Key Security**: Use strong, unique API keys for production
+2. **Network Security**: Restrict access to port 8000 using firewalls
+3. **Certificate Security**: Private key endpoints require authentication
+4. **Log Security**: Monitor log files for sensitive information
+
+## Monitoring and Alerting
+
+1. **Error Monitoring**: Monitor `/var/log/haproxy-manager-errors.log`
+2. **Certificate Monitoring**: Use certificate status endpoint for expiration tracking
+3. **HAProxy Monitoring**: Health check endpoint provides service status
+4. **Automated Alerting**: Configure monitoring script with email/webhook alerts
+
+## Future Enhancements
+
+Potential areas for future development:
+1. Webhook integration for certificate renewal notifications
+2. Advanced certificate management (wildcard certificates, etc.)
+3. HAProxy statistics and monitoring endpoints
+4. Configuration backup and restore functionality
+5. Multi-tenant support with per-domain API keys