Drupal Gallery Importer for WordPress

A robust WordPress plugin that imports Drupal galleries from JSON format into a custom post type with background processing, batch imports, and multiple display options.

🎯 Features

Core Functionality

• JSON Import: Import galleries from Drupal JSON exports
• Background Processing: Automatic background processing for large imports
• Batch Management: Process galleries in configurable batches to prevent timeouts
• Image Downloads: Automatically download and import images to WordPress media library
• Progress Tracking: Real-time progress monitoring with pause/resume/stop controls
• Smart Duplicate Detection: Skip existing galleries based on Drupal NID

Gallery Management

• Custom Post Type: Dedicated gallery post type with full WordPress support
• Taxonomy Support: gallery_type taxonomy for organizing galleries
• Meta Storage: Preserves Drupal NID and original links
• Sortable Images: Drag-and-drop image ordering in admin
• Media Library Integration: Full WordPress media library support

Display Options

• Auto Display: Galleries automatically append to single gallery pages
• Shortcodes: Multiple shortcode options for flexible display
• Responsive Grid: Mobile-friendly responsive layouts
• Lightbox: Built-in lightbox for image viewing
• Customizable Columns: 1-6 column layouts

Performance & Safety

• Memory Management: Smart memory monitoring and allocation
• Timeout Protection: Automatic background processing for large files
• Optimized Deletion: Background processing for galleries with 30+ images
• Orphan Protection: Only deletes images not used elsewhere
• Cache Management: Intelligent cache clearing during processing

📋 Requirements

• WordPress 5.0 or higher
• PHP 7.4 or higher
• MySQL 5.6 or higher
• PHP extensions: json, curl, gd or imagick

🚀 Installation

Manual Installation

1. Download the plugin files
2. Upload to /wp-content/plugins/drupal-gallery-importer/
3. Activate through WordPress admin → Plugins
4. Navigate to Galleries → Import to begin

Via WordPress Admin

1. Go to Plugins → Add New
2. Upload the plugin ZIP file
3. Click "Install Now" then "Activate"

📖 Usage

Importing Galleries

1. Navigate to Galleries → Import

2. Upload your JSON file

3. Configure import options:

   • Drupal Site URL: Base URL for image downloads
   • Skip Existing: Avoid duplicate imports
   • Download Images: Import images to media library
   • Background Processing: Recommended for large imports

4. Click "Import Galleries"

5. Monitor progress in real-time

JSON Format

{
  "items": [
    {
      "nid": 8821,
      "title": "Summer Gallery 2024",
      "description": "Beautiful summer photos",
      "summary": "A collection of summer memories",
      "publish_date": "2024-06-15 10:30:00",
      "link": "/gallery/summer-2024",
      "gallery_types": [
        { "name": "Events" },
        { "name": "Seasonal" }
      ],
      "images": [
        "/sites/default/files/gallery/image1.jpg",
        "/sites/default/files/gallery/image2.jpg"
      ]
    }
  ]
}

Shortcodes

Single Gallery Display

[gallery_display id="123" columns="4" size="medium" lightbox="yes"]

Parameters:

• id - Gallery post ID (default: current post)
• columns - Number of columns 1-6 (default: 3)
• size - Image size (default: medium)
• lightbox - Enable lightbox yes/no (default: yes)

Gallery Index with Pagination

[gallery_index_lightbox per_page="24" columns="4" size="large" show_titles="yes" orderby="date" order="DESC"]

Parameters:

• per_page - Galleries per page (default: 24)
• columns - Grid columns 1-6 (default: 4)
• size - Thumbnail size (default: large)
• show_titles - Display titles yes/no (default: yes)
• orderby - Sort field (default: date)
• order - ASC or DESC (default: DESC)
• new_tab - Open in new tab yes/no (default: no)

🎨 Customization

Filters

// Modify gallery columns on single pages
add_filter('dgi_gallery_columns', function($columns) {
    return 5; // Return 1-6
});

// Force asset loading on specific pages
add_filter('dgi_force_assets', function($force) {
    return is_page('galleries');
});

Styling

The plugin includes responsive CSS that can be overridden in your theme:

/* Override gallery grid */
.nu-gallery-grid {
    gap: 20px;
}

/* Customize gallery items */
.nu-gallery-item {
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

⚙️ Configuration

Import Settings

Configure in Galleries → Import:

• Batch Size: Number of galleries per batch (default: 5)
• Image Batch Size: Images processed per cycle (default: 3)
• Max Processing Time: Seconds per batch (default: 15)
• Download Timeout: Image download timeout (default: 45s)

Deletion Settings

Configure in Galleries → Settings:

• Delete Images: Remove orphaned images on gallery deletion
• Delete Terms: Remove unused gallery type terms
• Background Threshold: Galleries with 30+ images process in background

🔧 Advanced Features

Background Processing

Large imports automatically use background processing:

• Files over 3MB
• Insufficient memory detected
• Image downloads enabled

Job Management

Monitor and control import jobs in Galleries → Import Jobs:

• View all import jobs
• Check job status
• Access detailed logs
• View processing history

Diagnostic Tools

Built-in NID checker helps prevent duplicates:

1. Enter Drupal NID
2. Check if gallery exists
3. View existing gallery if found

Progress Controls

Real-time job controls during import:

• Pause: Temporarily halt processing
• Resume: Continue paused jobs
• Stop: Cancel import job
• Live Updates: Real-time progress tracking

🗑️ Gallery Deletion

Smart deletion protects shared resources:

Images

• Only deletes if not used in other galleries
• Checks featured image usage
• Background processing for 30+ images
• Prevents timeout errors

Gallery Types

• Only deletes if no other galleries use the term
• Automatic cleanup of orphaned terms
• Configurable via settings

🐛 Troubleshooting

Import Fails

Issue: Import stops or fails
Solution:

• Enable background processing
• Increase PHP memory_limit to 512M
• Check PHP error logs
• Verify JSON format

Images Not Downloading

Issue: Images fail to download
Solution:

• Check Drupal site URL is correct
• Verify images are publicly accessible
• Increase DGI_DOWNLOAD_TIMEOUT constant
• Check server firewall settings

Timeout Errors

Issue: Page times out during import
Solution:

• Background processing auto-enables for large files
• Reduce DGI_BATCH_SIZE constant
• Increase PHP max_execution_time
• Use WP-CLI for very large imports

Duplicate Galleries

Issue: Galleries import multiple times
Solution:

• Enable "Skip existing" option
• Use NID checker tool before import
• Check for duplicate NIDs in JSON

📊 Performance Tips

For Large Imports

1. Enable Background Processing: Always recommended
2. Increase PHP Limits:

   memory_limit = 512M
   max_execution_time = 300

3. Use Cron: Ensure WP-Cron is working
4. Monitor Logs: Check import logs for issues
5. Batch Processing: Let the plugin handle batching automatically

For Image-Heavy Galleries

1. Enable Image Downloads: Plugin optimizes automatically
2. Configure Timeouts: Adjust DGI_DOWNLOAD_TIMEOUT if needed
3. Server Resources: Ensure adequate bandwidth and storage
4. Background Jobs: Large galleries auto-process in background

🔌 Constants Reference

Override these in wp-config.php:

// Batch processing
define('DGI_BATCH_SIZE', 5);           // Galleries per batch
define('DGI_IMAGE_BATCH_SIZE', 3);     // Images per batch
define('DGI_MAX_SECONDS', 15);         // Max processing time

// File handling
define('DGI_UPLOAD_DIR', 'dgi-imports');
define('DGI_FILE_SIZE_FALLBACK', 3 * 1024 * 1024); // 3MB

// Network
define('DGI_DOWNLOAD_TIMEOUT', 45);    // Image download timeout

// Display
define('DGI_DEFAULT_COLUMNS', 3);      // Default grid columns

📝 Changelog

Version 2.5.0

• Added background image deletion for large galleries
• Improved orphan detection for images and terms
• Enhanced deletion settings interface
• Optimized database queries with caching
• Added NID diagnostic tool
• Improved progress tracking and controls

Version 2.0.0

• Complete background processing system
• Real-time progress monitoring
• Job pause/resume/stop controls
• Batch processing optimization
• Enhanced memory management

Version 1.0.0

• Initial release
• Basic JSON import functionality
• Gallery custom post type
• Simple shortcode support

🤝 Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests if applicable
5. Submit a pull request

📄 License

This plugin is licensed under the GPL v2 or later.

Copyright (C) 2024 Carl Nikoi

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

👨‍💻 Author

Carl Nikoi

🙏 Acknowledgments

• WordPress community for best practices
• Drupal migration community for insights
• Contributors and testers

📞 Support

• Issues: GitHub Issues
• Documentation: Wiki
• WordPress: Support Forum

🔮 Roadmap

• [ ] WP-CLI commands for bulk operations
• [ ] REST API endpoints
• [ ] Multi-site support
• [ ] Advanced image optimization
• [ ] Export functionality
• [ ] Gallery templates system
• [ ] Gutenberg blocks

Made with ❤️ for seamless Drupal to WordPress migrations