# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

## [0.3.1] - 2026-01-22

### Changed

- Settings page reorganized with sub-tab navigation similar to WooCommerce Advanced tab
- Settings split into three sections: Plugin License, Default Settings, Notifications
- Improved settings UI with WooCommerce-style section navigation

### Technical Details

- SettingsController refactored with `getSections()` and `outputSections()` methods
- Section-specific settings methods using PHP 8 match expression
- Hooks updated to use `woocommerce_sections_licensed_product` for sub-navigation

## [0.3.0] - 2026-01-22

### Added

- Self-licensing functionality: Plugin validates its own license against a remote server
- Plugin license settings in WooCommerce > Settings > Licensed Products tab
- License Server URL, License Key, and optional Server Secret configuration
- License status display in settings with verify button
- Localhost bypass: All features work without license when running on localhost
- Admin notice when plugin license is not configured or invalid

### Changed

- Frontend features now require a valid plugin license to function
- Disabled features without license: Checkout domain field, customer licenses page, downloads, license generation

### Technical Details

- New `PluginLicenseChecker` singleton class for license validation
- Integration with `magdev/wc-licensed-product-client` Composer package
- Caching: 1 hour for valid license, 5 minutes for errors
- Localhost detection supports: localhost, 127.0.0.1, ::1, and .localhost/.local subdomains

## [0.2.2] - 2026-01-22

### Added

- SHA256 checksum column in admin product versions table
- File hash display in customer account downloads section
- Visual indicators for file integrity verification

### Changed

- Checksum file upload field now styled consistently with package upload field
- Download list items now show truncated hash with full hash on hover

### Technical Details

- ProductVersion `getFileHash()` method now exposed in admin and frontend views
- Frontend CSS extended with `.download-hash` styles
- Admin CSS extended with `.file-hash` styles

## [0.2.1] - 2026-01-22

### Changed

- SHA256 hash input changed from text field to file upload field
- Checksum files (.sha256 or .txt) can now be uploaded directly
- Improved user experience for version integrity verification

### Technical Details

- Added `readChecksumFile()` JavaScript function using FileReader API with Promise support
- Checksum file format supports both "hash  filename" and plain "hash" formats
- Added localized error messages for checksum file validation

## [0.2.0] - 2026-01-22

### Added

- Response signing for REST API using HMAC-SHA256
- SHA256 hash field for product version uploads with checksum validation
- File integrity verification before storing uploaded version files
- New `ResponseSigner` class for automatic API response signing
- Database column `file_hash` in versions table for storing checksums

### Changed

- Version uploads now require file attachments (external URL option removed)
- API responses now include `X-License-Signature` and `X-License-Timestamp` headers when `WC_LICENSE_SERVER_SECRET` is configured

### Removed

- External download URL field from product version form
- Direct URL support in version uploads (use Media Library uploads only)

### Security

- API response signing prevents tampering and replay attacks
- Per-license key derivation using HKDF-like approach
- SHA256 checksum validation ensures file integrity

### Technical Details

- New class: `ResponseSigner` for HMAC-SHA256 response signing
- VersionManager extended with `$fileHash` parameter and validation
- ProductVersion model extended with `fileHash` property
- Signature algorithm: `HMAC-SHA256(derived_key, timestamp + ':' + canonical_json)`
- Key derivation: `HMAC-SHA256(HMAC-SHA256(license_key, server_secret) + "\x01", server_secret)`
- Compatible with `magdev/wc-licensed-product-client` SecureLicenseClient

### Configuration

To enable response signing, add to `wp-config.php`:

```php
define('WC_LICENSE_SERVER_SECRET', 'your-secure-random-string-min-32-chars');
```

## [0.1.0] - 2026-01-22

### Added

- First stable minor release
- Comprehensive code review for WordPress/WooCommerce best practices
- Security audit completed

### Changed

- Improved input sanitization for admin page context checks
- Fixed VersionManager null format handling for attachment updates

### Technical Details

- All code reviewed for OWASP Top 10 security vulnerabilities
- Verified proper nonce verification, capability checks, and input sanitization
- SQL injection prevention confirmed using `$wpdb->prepare()` throughout
- XSS prevention confirmed with proper output escaping
- Rate limiting verified on REST API endpoints
- README.md updated with full feature documentation

## [0.0.11] - 2026-01-22

### Added

- Created date column in admin license overview

### Technical Details

- Added "Created" column to licenses table in admin (Twig template and PHP fallback)
- Shows when each license was generated

## [0.0.10] - 2026-01-21

### Added

- License meta box on WooCommerce order edit pages
- Editable order domain field with AJAX save
- Editable license domains directly from order page
- View licenses table showing all licenses for an order
- Link to full licenses management page from order view
- Support for both classic orders and HPOS (High-Performance Order Storage)
- Inline editing for license fields (status, expiry date, domain) in admin
- Copy license key button in admin licenses overview
- Live search for licenses in admin overview
- Settings link in plugin actions

### Fixed

- Fixed 404 error on licenses menu item
- Fixed Twig template cache issues with auto_reload

### Technical Details

- New `OrderLicenseController` class for order page integration
- New `getLicensesByOrder()` method in LicenseManager
- New `updateLicenseExpiry()` method in LicenseManager
- JavaScript file `order-licenses.js` for inline domain editing
- JavaScript file `admin-licenses.js` for live search and inline editing
- AJAX handlers for updating order domain and license domains
- AJAX handlers for inline editing (status, expiry, domain updates)

## [0.0.9] - 2026-01-21

### Added

- API client examples for multiple programming languages
- cURL command examples (`docs/client-examples/curl.sh`)
- PHP client class (`docs/client-examples/php-client.php`)
- Python client class (`docs/client-examples/python-client.py`)
- JavaScript/Node.js client (`docs/client-examples/javascript-client.js`)
- C# client class (`docs/client-examples/csharp-client.cs`)
- Client examples documentation (`docs/client-examples/README.md`)

### Technical Details

- All clients include rate limiting handling (HTTP 429)
- Examples demonstrate validate, status, and activate endpoints
- JavaScript client works in both browser and Node.js environments
- Python client uses dataclasses for type-safe responses
- C# client uses async/await patterns

## [0.0.8] - 2026-01-21

### Changed

- Current version now automatically derived from latest product version
- Email system refactored to use WooCommerce transactional emails
- License expiration warning email now configurable via WooCommerce email settings

### Removed

- "Current Version" field from product license settings panel

### Technical Details

- New `LicenseExpirationEmail` class extends WC_Email
- LicensedProduct's `get_current_version()` queries VersionManager
- Uses WooCommerce email header/footer templates
- Warning days configurable in plugin settings

## [0.0.7] - 2026-01-21

### Added

- License Dashboard moved to WooCommerce Reports section (Reports > Licenses)
- License search and filtering in admin (by license key, domain, status, product)
- Customer-facing license transfer request with AJAX-based modal
- Email notifications for license expiration warnings (7 days and 1 day before)
- Bulk import licenses from CSV functionality
- Import page with detailed format instructions
- Scheduled cron job for daily expiration checks

### Changed

- Dashboard now accessible via WooCommerce > Reports > Licenses tab
- License list page includes search box and filter dropdowns
- Pagination preserves filter state
- Import CSV button added to licenses page header

### Technical Details

- AccountController extended with customer transfer AJAX handler and domain normalization
- LicenseEmailController extended with expiration warning scheduling and email templates
- LicenseManager extended with `getLicensesExpiringSoon()`, `markExpirationNotified()`, `wasExpirationNotified()`, `importLicense()` methods
- AdminController extended with CSV import handling and import page rendering
- Installer clears cron events on plugin deactivation
- Frontend JavaScript extended for transfer modal handling
- Frontend CSS extended with modal and transfer button styles

## [0.0.6] - 2026-01-21

### Added

- License usage statistics/analytics dashboard (WooCommerce > License Dashboard)
- License transfer functionality to change domain from admin
- Export licenses to CSV functionality
- OpenAPI 3.1 specification for REST API documentation (`openapi.json`)
- Monthly license creation chart on dashboard
- Top products and top domains statistics
- Expiring soon alerts on dashboard

### Removed

- API endpoint `/deactivate` removed (license deactivation is now admin-only)

### Changed

- Licenses admin page header now includes Export CSV button
- Actions column widened to accommodate Transfer link
- Dashboard link added to licenses page

### Technical Details

- New admin page: License Dashboard with statistics overview
- LicenseManager extended with `transferLicense()`, `getStatistics()`, `exportLicensesForCsv()` methods
- AdminController extended with dashboard rendering, CSV export, and transfer handling
- Transfer modal with form for domain change
- REST API now only has three endpoints: `/validate`, `/status`, `/activate`
- OpenAPI 3.1 specification documents all API endpoints with examples

## [0.0.5] - 2026-01-21

### Added

- Bulk license operations in admin (activate, deactivate, revoke, extend, delete)
- License renewal/extension functionality (extend by 30/90/365 days)
- Set license to lifetime (remove expiration)
- Quick action buttons per license row (+30d, ∞, Revoke, Delete)
- Checkbox selection for bulk operations with select-all functionality
- Improved admin notices for bulk operation results

### Changed

- Licenses admin page redesigned with WordPress list table styling
- License actions use row-actions pattern for cleaner UI
- Bulk action dropdowns at top and bottom of table (synchronized)

### Technical Details

- LicenseManager extended with `extendLicense()`, `setLicenseLifetime()`, `bulkUpdateStatus()`, `bulkDelete()`, `bulkExtend()` methods
- AdminController extended with bulk action handling and extend/lifetime actions
- Twig template functions for generating action URLs with nonces
- JavaScript for checkbox sync and bulk action handling

## [0.0.4] - 2026-01-21

### Added

- WooCommerce settings tab "Licensed Products" for default license settings
- Default settings for Max Activations, License Validity, and Bind to Major Version
- Per-product settings now override global defaults (empty = use default)
- Settings link in product edit page pointing to WooCommerce settings

### Changed

- Product license settings now show placeholder with default values
- LicensedProduct class now falls back to global defaults when product settings are empty

### Technical Details

- New class: SettingsController for WooCommerce settings integration
- LicensedProduct model extended with `has_custom_*` methods for checking overrides
- Settings stored using WooCommerce options API

## [0.0.3] - 2026-01-21

### Added

- File attachment support for product versions (WordPress Media Library integration)
- Version auto-detection from uploaded filenames (e.g., `plugin-v1.2.3.zip`)
- Customer download page for purchased licenses with secure authenticated downloads
- License key copy-to-clipboard functionality on account page and emails
- New card-based UI for customer licenses page with download section
- DownloadController for secure file delivery with hash-based URL verification

### Changed

- Product versions meta box now hidden for non-licensed product types (dynamic show/hide)
- Redesigned customer licenses page with modern card layout
- Frontend JavaScript and CSS enhancements for better UX

### Technical Details

- New class: DownloadController for secure file downloads
- Database schema updated: `attachment_id` column added to versions table
- ProductVersion model extended with `getEffectiveDownloadUrl()` and `getDownloadFilename()`
- Secure download URLs use hash verification (license_id-version_id-hash format)

## [0.0.2] - 2026-01-21

### Added

- Product version management UI in admin (meta box on product edit page)
- AJAX-based version CRUD operations (add, delete, toggle active status)
- ProductVersion model and VersionManager for version data handling
- Email notifications with license keys on order completion
- License information included in WooCommerce order completed emails
- Rate limiting for REST API endpoints (30 requests/minute per IP)
- Cloudflare and proxy-aware IP detection for rate limiting
- JavaScript for version management interactions

### Changed

- Declared WooCommerce HPOS and cart/checkout blocks compatibility
- Plugin name changed from "WC Licensed Product" to "WooCommerce Licensed Product"

### Technical Details

- New classes: ProductVersion, VersionManager, VersionAdminController, LicenseEmailController
- Rate limiting uses WordPress transients for request counting
- HTTP 429 response with Retry-After header when rate limited

## [0.0.1] - 2026-01-21

### Added

- Initial plugin structure with WordPress Plugin API integration
- New WooCommerce product type "Licensed Product" for selling software licenses
- License key generation with format XXXX-XXXX-XXXX-XXXX on order completion
- Domain-based license validation (licenses bound to specific domains)
- REST API endpoints for license management:
  - `POST /wp-json/wc-licensed-product/v1/validate` - Validate license for domain
  - `POST /wp-json/wc-licensed-product/v1/status` - Check license status
  - `POST /wp-json/wc-licensed-product/v1/activate` - Activate license on domain
- Checkout domain field for licensed products
- Customer account page "Licenses" to view purchased licenses
- Admin interface for license management (WooCommerce > Licenses)
- License settings per product:
  - Maximum activations per license
  - License validity period (days or lifetime)
  - Optional binding to major software version
  - Current version tracking
- Custom database tables for licenses and product versions
- Twig template engine integration for views
- Full internationalization support (i18n)
- German (Switzerland, formal) translation (de_CH)
- WooCommerce HPOS compatibility
- Responsive frontend license table

### Technical

- PHP 8.3+ required
- WooCommerce 10.0+ required
- PSR-4 autoloading via Composer
- Twig 3.0 template engine
- WordPress REST API integration
- Custom WooCommerce product type extending WC_Product

[Unreleased]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.3.1...HEAD
[0.3.1]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.3.0...v0.3.1
[0.3.0]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.2.2...v0.3.0
[0.2.2]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.2.1...v0.2.2
[0.2.1]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.2.0...v0.2.1
[0.2.0]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.1.0...v0.2.0
[0.1.0]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.11...v0.1.0
[0.0.11]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.10...v0.0.11
[0.0.10]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.9...v0.0.10
[0.0.9]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.8...v0.0.9
[0.0.8]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.7...v0.0.8
[0.0.7]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.6...v0.0.7
[0.0.6]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.5...v0.0.6
[0.0.5]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.4...v0.0.5
[0.0.4]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.3...v0.0.4
[0.0.3]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.2...v0.0.3
[0.0.2]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/compare/v0.0.1...v0.0.2
[0.0.1]: https://src.bundespruefstelle.ch/magdev/wc-licensed-product/releases/tag/v0.0.1