# 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 Request API
- **Endpoint**: `POST /api/certificates/request`
- **Functionality**:
  - Request certificate generation for one or more domains
  - Support for multiple domains in a single request
  - Optional www subdomain inclusion
  - Force renewal option
  - Automatic domain addition to database if not exists
  - Batch processing with detailed results
- **Use Case**: Allow other services to request certificate generation through the HAProxy service
- **Response**: Detailed status for each domain with success/failure information

### 4. 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

### 5. 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

### 6. 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/request` - Request certificate generation for domains
- `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