# Configuration Guide

This guide covers all configuration options available in Aurora GIS.

## Configuration Files

### Primary Configuration: `config/const.php`

This file contains the core application constants. It is created during initialization and should not be edited manually unless necessary.

```php
const DB_HOST = 'localhost';           // PostgreSQL host
const DB_NAME = 'aurora_gis';         // Database name
const DB_USER = 'aurora_user';        // Database username
const DB_PASS = 'your_password';      // Database password
const DB_PORT = '5432';               // Database port

const DATA_DIR = '/var/www/data';     // Data directory for file storage
const SESS_USR_KEY = 'dc_user';       // Session key for user data
const SUPER_ADMIN_ID = 1;             // ID of super admin user
```

### Database Configuration: `config/database.php`

This file handles database connections and connection pooling settings.

Key settings:
- **PDO Error Mode**: Set to `ERRMODE_EXCEPTION` for error handling
- **Prepared Statements**: Uses emulated prepares for PgBouncer compatibility
- **Statement Timeout**: 30 seconds (30000ms)
- **Idle Transaction Timeout**: 15 seconds (15000ms)

## Authentication Configuration

### OAuth Providers

Configure OAuth providers in `config/const.php`:

```php
const DISABLE_OAUTH_USER_CREATION = false;  // Set to true to disable auto user creation
const GITHUB_CLIENT_ID = 'your_github_client_id';
const GITHUB_CLIENT_SECRET = 'your_github_client_secret';
const GOOGLE_CLIENT_ID = 'your_google_client_id';
const GOOGLE_CLIENT_SECRET = 'your_google_client_secret';
const MICROSOFT_CLIENT_ID = 'your_microsoft_client_id';
const MICROSOFT_CLIENT_SECRET = 'your_microsoft_client_secret';
const MICROSOFT_TENANT_ID = 'your_microsoft_tenant_id';
```

### OAuth Setup

1. **GitHub OAuth**:
   - Go to GitHub Settings > Developer settings > OAuth Apps
   - Create a new OAuth App
   - Set Authorization callback URL: `https://your-domain/auth-github.php`
   - Copy Client ID and Client Secret

2. **Google OAuth**:
   - Go to Google Cloud Console > APIs & Services > Credentials
   - Create OAuth 2.0 Client ID
   - Add authorized redirect URI: `https://your-domain/auth-google.php`
   - Copy Client ID and Client Secret

3. **Microsoft OAuth**:
   - Go to Azure Portal > App registrations
   - Create new registration
   - Add redirect URI: `https://your-domain/auth-microsoft.php`
   - Copy Application (client) ID, Directory (tenant) ID, and Client secret

## Data Directory Configuration

The `DATA_DIR` constant specifies where uploaded files and processed data are stored:

```php
const DATA_DIR = '/var/www/data';
```

Ensure this directory:
- Exists and is writable by the web server user
- Has sufficient disk space
- Has proper permissions (755 for directories, 644 for files)

Subdirectories created automatically:
- `uploads/` - Uploaded files
- `uploads/geoserver_documents/` - GeoServer documents
- `uploads/tabular/` - Tabular data files
- `uploads/raster/` - Raster files
- `uploads/qgis/` - QGIS projects
- `logs/` - Application logs

## Database Settings

### Connection Pooling (PgBouncer)

If using PgBouncer for connection pooling, the application uses emulated prepared statements:

```php
PDO::ATTR_EMULATE_PREPARES => true
```

### Timeout Settings

Configured in `config/database.php`:

```php
$pdo->exec("SET statement_timeout = 30000");  // 30 seconds
$pdo->exec("SET idle_in_transaction_session_timeout = 15000");  // 15 seconds
```

Adjust these values based on your workload:
- Increase `statement_timeout` for long-running queries
- Decrease `idle_in_transaction_session_timeout` to prevent connection leaks

## Application Settings

Application settings are stored in the `app_settings` table and can be managed via the admin interface or directly in the database.

### Common Settings

Access via `includes/settings.php` functions:

```php
get_app_setting($pdo, 'setting_key', $default);
set_app_setting($pdo, 'setting_key', 'value');
```

### System Settings Page

Access system settings via the admin interface at `/system_settings.php`:

- **Site Name**: Display name for the application
- **Default Basemap**: Default map tile provider
- **Max Upload Size**: Maximum file upload size
- **Enable Public Access**: Allow anonymous dataset access
- **Email Settings**: SMTP configuration for notifications

## Worker Configuration

Background workers are configured via systemd service files in the `systemd/` directory.

### Worker Service Files

Each worker has a corresponding `.service` file:

- `hotspot_worker.service` - Hotspot analysis worker
- `outlier_worker.service` - Outlier analysis worker
- `nearest_worker.service` - Nearest neighbor analysis worker
- `dissolve_worker.service` - Dissolve operations worker
- `clip_worker.service` - Clip operations worker
- `raster_clip_worker.service` - Raster clip operations worker

### Configuring Workers

Edit the service file to set:
- Working directory
- PHP path
- User/group
- Environment variables
- Resource limits

Example service file:

```ini
[Unit]
Description=Hotspot Analysis Worker
After=network.target postgresql.service

[Service]
Type=simple
User=www-data
WorkingDirectory=/var/www/html/aurora-gis
ExecStart=/usr/bin/php workers/hotspot_analysis_worker.php
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target
```

## GeoServer Configuration

If using GeoServer for WMS/WFS services:

1. Configure GeoServer connection in `config/const.php` or environment variables
2. Set GeoServer admin credentials
3. Configure workspace and data stores
4. Enable required services (WMS, WFS, WCS)

## QGIS Server Configuration

For QGIS project rendering:

1. Install QGIS Server (see Installation Guide)
2. Configure QGIS Server settings in `mapproxy_settings.php`
3. Set QGIS Server URL in application settings
4. Ensure QGIS projects are accessible to QGIS Server

## pg_tileserv Configuration

For vector tile generation:

1. Install and configure pg_tileserv
2. Ensure PostGIS tables have proper SRID constraints
3. Configure pg_tileserv to discover tables automatically
4. Set pg_tileserv URL in application settings

## Security Configuration

### File Upload Security

- File type validation is enforced
- File size limits can be configured
- Uploaded files are stored outside the web root when possible
- File names are sanitized to prevent path traversal

### Database Security

- Use prepared statements (automatic via PDO)
- Database credentials stored in `config/const.php` (protect this file)
- User access controlled via `access_group` and `user_access` tables
- Dataset-level permissions via `dataset_permissions` table

### Session Security

- Session key configured via `SESS_USR_KEY` constant
- Session cookies should be HTTP-only and secure in production
- Configure session timeout in `php.ini`

## Performance Tuning

### PostgreSQL Tuning

Key PostgreSQL settings for optimal performance:

```sql
-- Increase shared buffers
shared_buffers = 256MB

-- Increase work memory for complex queries
work_mem = 16MB

-- Enable parallel queries
max_parallel_workers_per_gather = 4

-- Optimize for spatial queries
random_page_cost = 1.1  # For SSD storage
```

### PHP Tuning

In `php.ini`:

```ini
memory_limit = 512M
max_execution_time = 300
upload_max_filesize = 100M
post_max_size = 100M
```

### Application Tuning

- Enable OPcache for PHP
- Use connection pooling (PgBouncer)
- Configure appropriate worker counts
- Monitor and optimize slow queries

## Environment-Specific Configuration

### Development

- Enable error display: `ini_set('display_errors', 1)`
- Use verbose logging
- Disable caching
- Use test database

### Production

- Disable error display: `ini_set('display_errors', 0)`
- Enable error logging
- Use production database
- Enable caching
- Use HTTPS only
- Configure proper backup strategy

## Monitoring and Logging

### Application Logs

Logs are stored in the `logs/` directory:
- `error.log` - PHP errors
- `worker_*.log` - Worker-specific logs
- `import_*.log` - Import operation logs

### Database Logging

Enable PostgreSQL logging:

```conf
# In postgresql.conf
logging_collector = on
log_directory = 'log'
log_filename = 'postgresql-%Y-%m-%d.log'
log_statement = 'all'  # or 'mod' for modifications only
```

## Related Documentation

- [Installation Guide](installation.md)
- [Architecture Overview](architecture.md)
- [Workers Documentation](workers/index.md)