Description of the Change

This PR introduces significant enhancements to the GatherPress RSVP system, focusing on expanding functionality for non-logged-in
users and improving code maintainability.

🚀 New Features

Anonymous RSVP Support

• Added support for anonymous RSVP submissions with name and email fields
• Implemented guest count functionality for RSVPs
• Added email update opt-in preferences for non-logged-in users
• Enhanced RSVP form with conditional field visibility based on user authentication status

Token-Based Authentication

• Expanded Rsvp_Token class with factory pattern for token creation and validation
• Added from_token_string() and from_url_parameter() methods for flexible token handling
• Improved token security and validation logic

Email Communication System

• Added new EmailNotificationManager component for managing email notifications
• Created dedicated email modal store (src/stores/email-modal.js) for state management
• Enhanced email communication UI with better user experience

🔧 Technical Improvements

HTTP Input Handling Refactor

• Created Utility::get_http_input() wrapper for secure and testable HTTP input processing
• Added Utility::get_wp_referer() wrapper with testing capabilities
• Implemented WordPress-style pre_ filter pattern for test mocking (test-environment only for security)
• Removed redundant wrapper methods throughout codebase in favor of centralized utility

Form Processing Enhancements

• Updated RSVP form schema to support new field types (gatherpress_rsvp_guests, gatherpress_rsvp_anonymous,
  gatherpress_event_updates_opt_in)
• Enhanced form visibility handling with data attributes and conditional rendering
• Improved form submission flow with better success/error state management

Code Quality & Standards

• Added proper use statements throughout codebase, eliminating fully-qualified namespace calls
• Enhanced CSS class checking with Utility::has_css_class() to prevent false positive substring matches
• Fixed PHP 8.4 compatibility issues with nullable type declarations
• Resolved PHPStan static analysis issues

🧪 Testing Infrastructure Overhaul

Comprehensive Test Coverage

• Restored and enhanced unit tests for HTTP input handling with multiple sanitizer functions
• Added extensive test coverage for Rsvp_Token functionality (18 new test methods)
• Enhanced Rsvp_Setup tests with proper WordPress environment simulation
• Created comprehensive utility tests covering edge cases and special characters

Testing Methodology Improvements

• Replaced global variable mocking with WordPress filter-based testing patterns
• Implemented secure test-only filters using WP_TESTS_DOMAIN and PHPUNIT_RUNNING checks
• Fixed test environment simulation for proper RSVP form handling
• Added proper callable sanitizer function testing

📝 Additional Changes

• Updated composer dependencies and resolved version conflicts
• Enhanced modal management system for better user interactions
• Improved event REST API with additional validation and security measures
• Updated JavaScript components for better React patterns and state management
• Fixed various linting issues (PHP CodeSniffer, PHPStan, ESLint)

🔒 Security Considerations

• Test-only filter access restricted to unit test environments
• Enhanced token validation with proper factory pattern
• Improved input sanitization with callable sanitizer functions
• Added proper nonce handling and caching headers for security

Closes #1086 #1157 #1158

How to test the Change

Changelog Entry

Added - New feature
Changed - Existing functionality
Deprecated - Soon-to-be removed feature
Removed - Feature
Fixed - Bug fix
Security - Vulnerability

Credits

Props @mauteri

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.