relevant-density-optimizer.php

<?php
/**
 * Plugin Name: Relevant Density Optimizer (RDO) - On-Page SEO Tool
 * Description: Highlight terms in Gutenberg editor and optimize relevant density for SEO.
 * Author: Infinitnet
 * Author URI: https://infinitnet.io/
 * Plugin URI: https://infinitnet.io/relevant-density-optimizer/
 * Version: 1.8.0
 * License: GPLv2 or later
 * Text Domain: relevant-density-optimizer
 */

namespace Infinitnet\RDOINFINITNET;

if (!defined('ABSPATH')) {
    exit;
}

define('RDOINFINITNET_VERSION', '1.8.0');

function rdoinfinitnet_enqueue_block_editor_assets() {
    // Only proceed if user has appropriate permissions
    if (!current_user_can('edit_posts')) {
        return;
    }

    if (!wp_script_is('rdoinfinitnet-plugin-js', 'enqueued')) {
        wp_enqueue_script(
            'rdoinfinitnet-plugin-js',
            plugin_dir_url(__FILE__) . 'rdoinfinitnet.js',
            array(
                'wp-plugins',
                'wp-editor',
                'wp-element',
                'wp-data',
                'wp-compose',
                'wp-components',
                'wp-blocks',
                'wp-i18n',
                'wp-dom-ready'
            ),
            RDOINFINITNET_VERSION,
            true
        );
        
        // Add a nonce for the editor operations
        wp_localize_script(
            'rdoinfinitnet-plugin-js',
            'rdoinfinitnetData',
            array(
                'nonce' => wp_create_nonce('rdoinfinitnet_nonce'),
                'ajaxUrl' => admin_url('admin-ajax.php')
            )
        );
    }

    wp_enqueue_style('rdoinfinitnet-plugin-css', plugin_dir_url(__FILE__) . 'rdoinfinitnet.css', array(), RDOINFINITNET_VERSION);
}

function rdoinfinitnet_register_meta() {
    register_meta('post', '_important_terms', array(
        'show_in_rest' => true,
        'single' => true,
        'type' => 'string',
        'auth_callback' => function() {
            return current_user_can('edit_posts');
        },
        'sanitize_callback' => 'sanitize_textarea_field'
    ));
}

add_action('enqueue_block_editor_assets', __NAMESPACE__ . '\\rdoinfinitnet_enqueue_block_editor_assets');
add_action('init', __NAMESPACE__ . '\\rdoinfinitnet_register_meta');