oxy-prefetch.php

<?php
/**
 * Plugin Name: Oxyplug Prefetch & Prerender
 * Plugin URI: https://www.oxyplug.com/products/oxy-prefetch
 * Description: Faster loading next pages by prerendering/prefetching all links a user hovers or addresses you prefer. It improves UX and Core Web Vitals score.
 * Version: 3.1.2
 * Author: Oxyplug
 * Author URI: https://www.oxyplug.com
 * Text Domain: oxy-prefetch
 * Domain Path: /lang/
 * Requires at least: 5.3
 * Requires PHP: 7.4
 * Tested up to: 7.1
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 *
 * Copyright 2025 OxyPlug
 */

if (!function_exists('str_starts_with')) {
  /**
   * Polyfill for PHP < 8.0.
   *
   * @param string $haystack
   * @param string $needle
   * @return bool
   */
  function str_starts_with($haystack, $needle)
  {
    return $needle === '' || strpos($haystack, $needle) === 0;
  }
}

class OxyPrefetch
{
  public $wpdb;

  public array $already_added = array(
    'prefetch' => array(),
    'prerender' => array()
  );
  public array $script_immediate = array();
  public array $script_moderate = array();

  /**
   * Guards against re-entering the save handler when wp_update_post() fires save_post.
   * @var bool
   */
  private bool $is_saving = false;

  const OXY_PREFETCH_VERSION = '3.1.1';

  const OXY_PREFETCHES_NUMBER_DEFAULT = 4;
  const OXY_PREFETCHES_NUMBER_MAX = 50;
  const OXY_PREFETCHES_NUMBER_MIN = 1;

  const OXY_PREFETCH_PRERENDER_NUMBER_DEFAULT = 3;
  const OXY_PREFETCH_PRERENDER_NUMBER_MAX = 10;
  const OXY_PREFETCH_PRERENDER_NUMBER_MIN = 1;

  const OXY_PREFETCHES_NUMBER_STATUS_DEFAULT = 'true';
  const OXY_PREFETCHES_HOVER_STATUS_DEFAULT = 'true';

  const OXY_PREFETCH_PRERENDER_NUMBER_STATUS_DEFAULT = 'false';
  const OXY_PREFETCH_PRERENDER_HOVER_STATUS_DEFAULT = 'false';
  const OXY_PREFETCH_PRERENDER_HREF_EXCLUSION_STATUS_DEFAULT = 'false';

  const OXY_PREFETCH_PRERENDER_EXCLUSION_DEFAULT = array(
    'href' => array('')
  );

  // Eagerness (hover/document rules). Chrome guidance: "start conservative".
  const OXY_PREFETCH_EAGERNESS_DEFAULT = 'moderate';
  const OXY_PREFETCH_EAGERNESS_VALUES = array('conservative', 'moderate', 'eager');

  // No-Vary-Search: lets one entry match URLs that differ only by these params.
  const OXY_PREFETCH_NO_VARY_SEARCH_STATUS_DEFAULT = 'true';
  const OXY_PREFETCH_NO_VARY_SEARCH_PARAMS_DEFAULT = 'utm_source utm_medium utm_campaign utm_term utm_content gclid fbclid msclkid';

  public function __construct()
  {
    global $wpdb;
    $this->wpdb = $wpdb;

    // Lang
    add_action('plugins_loaded', array($this, 'load_plugin_textdomain'));

    // Activation
    register_activation_hook(__FILE__, array($this, 'oxy_prefetch_activate'));

    // Menu
    add_action('admin_menu', array($this, 'add_menu'));

    add_action('admin_head', function () {
      // Load only in specific pages
      $screen = get_current_screen();
      if ($screen && in_array($screen->base, array('tools_page_oxy-prefetch-settings', 'post'))) {
        $component_path = plugins_url('assets/js/dist/', __FILE__);
        $components = array(
          'tools_page_oxy-prefetch-settings' => array('switch', 'outlined-text-field', 'icon', 'icon-button', 'outlined-button', 'filled-button'),
          'post' => array('switch', 'outlined-text-field', 'icon', 'icon-button', 'outlined-button')
        );
        $components = wp_json_encode($components[$screen->base]);
        ?>
        <link rel="preconnect" href="https://fonts.googleapis.com">
        <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
        <link href="https://fonts.googleapis.com/css2?family=Oxygen:wght@300;400;700&display=swap" rel="stylesheet">
        <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">

        <script type="module">
          // Load MD3 components
          (async function () {
            const OXY_PREFETCH_VERSION = '<?php echo static::OXY_PREFETCH_VERSION ?>'
            const components = '<?php echo $components ?>'
            const component_path = '<?php echo $component_path ?>'

            for (const component of JSON.parse(components)) {
              await import(`${component_path}${component}.js?ver=${OXY_PREFETCH_VERSION}`);
            }
          })();
        </script>
      <?php }
    });

    // Assets
    add_action('admin_enqueue_scripts', array($this, 'add_admin_assets'));
    add_action('enqueue_block_editor_assets', array($this, 'add_gutenberg_assets'));

    // Prefetch
    add_action('wp_ajax_save_prefetch_settings', array($this, 'save_prefetch_settings'));
    add_action('save_post', array($this, 'save_prefetch_static_links'), 10, 1);
    add_action('rest_api_init', array($this, 'add_rest_api'));

    // Prerender
    add_action('wp_ajax_dismiss_prerender_notice', array($this, 'dismiss_prerender_notice'));

    // Integrate with WordPress core Speculative Loading (WP >= 6.8)
    add_action('init', array($this, 'integrate_with_core_speculative_loading'));

    // Prerender + analytics caveat / core-active dismissible notice
    add_action('wp_ajax_dismiss_core_notice', array($this, 'dismiss_core_notice'));

    // Add Prefetch & Prerender
    add_action('wp_footer', array($this, 'add_speculation_rules_script'), 0);

    // Metabox
    add_action('add_meta_boxes', array($this, 'create_metabox'), 10);

    // Notices
    add_action('admin_notices', array($this, 'admin_notices'));
    add_action('wp_ajax_oxy_prefetch_admin_notices', array($this, 'oxy_prefetch_admin_notices'));
    add_filter('post_updated_messages', array($this, 'post_published'));

    // Settings
    add_filter('plugin_action_links', array($this, 'add_settings'), 10, 3);
  }

  /**
   * @return void
   */
  public function load_plugin_textdomain()
  {
    load_plugin_textdomain('oxy-prefetch', false, basename(dirname(__FILE__)) . '/lang/');
  }

  /**
   * @return void
   */
  public function oxy_prefetch_activate()
  {
    if (self::OXY_PREFETCH_VERSION != get_option('oxy_prefetch_version')) {
      update_option('oxy_prefetch_version', self::OXY_PREFETCH_VERSION, false);
    }
  }

  /**
   * @return void
   */
  public function add_menu()
  {
    add_submenu_page(
      'tools.php',
      'Oxyplug Prefetch & Prerender',
      'Oxyplug Prefetch & Prerender',
      'manage_options',
      'oxy-prefetch-settings',
      array($this, 'oxy_prefetch_settings')
    );
  }

  /**
   * @return void
   */
  public function oxy_prefetch_settings()
  {
    $oxy_prefetches_number_status = get_option('oxy_prefetches_number_status', self::OXY_PREFETCHES_NUMBER_STATUS_DEFAULT) == 'true';
    $oxy_prefetches_number = (int)(get_option('oxy_prefetches_number', self::OXY_PREFETCHES_NUMBER_DEFAULT));
    $oxy_prefetch_hover_status = get_option('oxy_prefetch_hover_status', self::OXY_PREFETCHES_HOVER_STATUS_DEFAULT) == 'true';
    $oxy_prefetch_prerender_number_status = get_option('oxy_prefetch_prerender_number_status', self::OXY_PREFETCH_PRERENDER_NUMBER_STATUS_DEFAULT) == 'true';
    $oxy_prefetch_prerender_number = (int)(get_option('oxy_prefetch_prerender_number', self::OXY_PREFETCH_PRERENDER_NUMBER_DEFAULT));
    $oxy_prefetch_prerender_hover_status = get_option('oxy_prefetch_prerender_hover_status', self::OXY_PREFETCH_PRERENDER_HOVER_STATUS_DEFAULT) == 'true';
    $oxy_prefetch_prerender_href_exclusion_status = get_option('oxy_prefetch_prerender_href_exclusion_status', self::OXY_PREFETCH_PRERENDER_HREF_EXCLUSION_STATUS_DEFAULT) == 'true';
    $oxy_prefetch_prerender_match = get_option('oxy_prefetch_prerender_match', self::OXY_PREFETCH_PRERENDER_EXCLUSION_DEFAULT);
    $oxy_prefetch_hover_eagerness = $this->get_eagerness('prefetch');
    $oxy_prefetch_prerender_hover_eagerness = $this->get_eagerness('prerender');
    $oxy_prefetch_no_vary_search_status = get_option('oxy_prefetch_no_vary_search_status', self::OXY_PREFETCH_NO_VARY_SEARCH_STATUS_DEFAULT) == 'true';
    $oxy_prefetch_no_vary_search_params = get_option('oxy_prefetch_no_vary_search_params', self::OXY_PREFETCH_NO_VARY_SEARCH_PARAMS_DEFAULT);
    $oxy_prefetch_eagerness_options = array(
      'conservative' => __('Conservative — on pointerdown / click (lowest risk)', 'oxy-prefetch'),
      'moderate'     => __('Moderate — on hover (~200ms)', 'oxy-prefetch'),
      'eager'        => __('Eager — as soon as the rule matches (highest risk)', 'oxy-prefetch'),
    );
    ?>

    <div class="oxy-prefetch-admin-page">
      <section class="oxy-prefetch-admin-head">
        <h1 class="oxy-prefetch-head-title">
          <span
              class="oxy-prefetch-brand-highlight"><?php esc_html_e('Oxyplug Prefetch & Prerender', 'oxy-prefetch') ?></span>
          <span>|</span>
          <span><?php esc_html_e('Settings', 'oxy-prefetch') ?></span>
        </h1>

        <div class="oxy-prefetch-need-help">
          <svg width="36" height="36" viewBox="0 0 36 36" fill="none" xmlns="http://www.w3.org/2000/svg">
            <path
                d="M7.59161 31.5676L8.1794 30.7586L7.59161 31.5676ZM5.93237 29.9084L6.74139 29.3206L5.93237 29.9084ZM30.0676 29.9084L29.2586 29.3206L30.0676 29.9084ZM28.4084 31.5676L27.8206 30.7586L28.4084 31.5676ZM28.4084 4.43237L28.9962 3.62336L28.4084 4.43237ZM30.0676 6.09161L29.2586 6.6794L30.0676 6.09161ZM7.59161 4.43237L8.1794 5.24139L7.59161 4.43237ZM5.93237 6.09161L6.74139 6.6794L5.93237 6.09161ZM19.7192 9.89296L19.8756 10.8807L19.7192 9.89296ZM17.3727 9.89296L17.2163 10.8807L17.3727 9.89296ZM12 23C11.4477 23 11 23.4477 11 24C11 24.5523 11.4477 25 12 25V23ZM24 25C24.5523 25 25 24.5523 25 24C25 23.4477 24.5523 23 24 23V25ZM12 17C11.4477 17 11 17.4477 11 18C11 18.5523 11.4477 19 12 19V17ZM16.5 19C17.0523 19 17.5 18.5523 17.5 18C17.5 17.4477 17.0523 17 16.5 17V19ZM30.5 16.5V19.5H32.5V16.5H30.5ZM5.5 19.5V16.5H3.5V19.5H5.5ZM18 32C15.1654 32 13.1198 31.9986 11.5336 31.8268C9.9661 31.6569 8.96626 31.3303 8.1794 30.7586L7.00383 32.3766C8.18845 33.2373 9.58051 33.6269 11.3182 33.8151C13.0371 34.0014 15.21 34 18 34V32ZM3.5 19.5C3.5 22.29 3.49863 24.4629 3.68486 26.1818C3.87313 27.9195 4.26267 29.3116 5.12336 30.4962L6.74139 29.3206C6.1697 28.5337 5.84306 27.5339 5.67323 25.9664C5.50137 24.3802 5.5 22.3346 5.5 19.5H3.5ZM8.1794 30.7586C7.62758 30.3577 7.14231 29.8724 6.74139 29.3206L5.12336 30.4962C5.64763 31.2178 6.28222 31.8524 7.00383 32.3766L8.1794 30.7586ZM30.5 19.5C30.5 22.3346 30.4986 24.3802 30.3268 25.9664C30.1569 27.5339 29.8303 28.5337 29.2586 29.3206L30.8766 30.4962C31.7373 29.3116 32.1269 27.9195 32.3151 26.1818C32.5014 24.4629 32.5 22.29 32.5 19.5H30.5ZM18 34C20.79 34 22.9629 34.0014 24.6818 33.8151C26.4195 33.6269 27.8115 33.2373 28.9962 32.3766L27.8206 30.7586C27.0337 31.3303 26.0339 31.6569 24.4664 31.8268C22.8802 31.9986 20.8346 32 18 32V34ZM29.2586 29.3206C28.8577 29.8724 28.3724 30.3577 27.8206 30.7586L28.9962 32.3766C29.7178 31.8524 30.3524 31.2178 30.8766 30.4962L29.2586 29.3206ZM32.5 16.5C32.5 13.71 32.5014 11.5371 32.3151 9.81818C32.1269 8.08051 31.7373 6.68845 30.8766 5.50383L29.2586 6.6794C29.8303 7.46626 30.1569 8.4661 30.3268 10.0336C30.4986 11.6198 30.5 13.6654 30.5 16.5H32.5ZM27.8206 5.24139C28.3724 5.64231 28.8577 6.12758 29.2586 6.6794L30.8766 5.50383C30.3524 4.78222 29.7178 4.14763 28.9962 3.62336L27.8206 5.24139ZM5.5 16.5C5.5 13.6654 5.50137 11.6198 5.67323 10.0336C5.84306 8.4661 6.1697 7.46626 6.74139 6.6794L5.12336 5.50383C4.26267 6.68845 3.87313 8.08051 3.68486 9.81818C3.49863 11.5371 3.5 13.71 3.5 16.5H5.5ZM7.00383 3.62336C6.28222 4.14763 5.64763 4.78222 5.12336 5.50383L6.74139 6.6794C7.14231 6.12758 7.62758 5.64231 8.1794 5.24139L7.00383 3.62336ZM19.5628 8.90528C18.8891 9.01198 18.2028 9.01198 17.5291 8.90528L17.2163 10.8807C18.0972 11.0202 18.9947 11.0202 19.8756 10.8807L19.5628 8.90528ZM12 25H24V23H12V25ZM12 19H16.5V17H12V19ZM26.9539 3.26967C25.0951 5.12711 23.7338 6.46779 22.5558 7.39555C21.3926 8.31159 20.4881 8.75872 19.5628 8.90528L19.8756 10.8807C21.2687 10.66 22.4884 9.99435 23.7932 8.9668C25.0831 7.95097 26.5334 6.51727 28.3676 4.68439L26.9539 3.26967ZM18 4C20.4907 4 22.3761 4.00071 23.8821 4.11906C25.3848 4.23715 26.4116 4.46712 27.2105 4.86993L28.111 3.08413C26.9722 2.50991 25.6443 2.25137 24.0388 2.1252C22.4366 1.99929 20.4605 2 18 2V4ZM27.2105 4.86993C27.4269 4.97906 27.6289 5.1021 27.8206 5.24139L28.9962 3.62336C28.7158 3.41966 28.4216 3.24078 28.111 3.08413L27.2105 4.86993ZM8.40124 4.3614C10.3389 6.29902 11.8529 7.81034 13.1857 8.87708C14.5333 9.95562 15.7832 10.6537 17.2163 10.8807L17.5291 8.90528C16.5773 8.75451 15.6476 8.28574 14.4355 7.31562C13.2086 6.33371 11.7829 4.91456 9.81542 2.94716L8.40124 4.3614ZM18 2C15.8443 2 14.0633 1.99964 12.5843 2.08338C11.1063 2.16707 9.85915 2.33736 8.78216 2.70897L9.4345 4.59959C10.2537 4.31692 11.2865 4.16007 12.6974 4.08019C14.1073 4.00036 15.824 4 18 4V2ZM8.78216 2.70897C8.1318 2.93337 7.54439 3.23061 7.00383 3.62336L8.1794 5.24139C8.54517 4.97564 8.95294 4.76575 9.4345 4.59959L8.78216 2.70897Z"
                fill="#2D2D2D"></path>
          </svg>
          <div>
            <span><?php esc_html_e('Need Help Or Have Questions?', 'oxy-prefetch') ?></span>
            <a class="oxy-prefetch-a" href="https://www.oxyplug.com/docs/oxy-prefetch/" target="_blank">
              <?php esc_html_e('Check our documentation.', 'oxy-prefetch') ?>
            </a>
          </div>
        </div>
      </section>

      <div class="oxy-prefetch-in-row">
        <div class="oxy-prefetch-card">
          <h2>
            <?php esc_html_e('Prefetch', 'oxy-prefetch') ?>
            <i class="dashicons dashicons-editor-help oxy-prefetch-has-tooltip"
               data-tooltip="<?php esc_attr_e('Prefetches only the document of the next page.', 'oxy-prefetch') ?>"
               data-href="https://www.oxyplug.com/docs/oxy-prefetch/settings/?utm_source=plugin-settings&utm_medium=wordpress&utm_campaign=oxy-prefetch#prefetch-settings"
               data-href-text="<?php esc_attr_e('Learn More', 'oxy-prefetch'); ?>"></i>
          </h2>

          <div class="oxy-prefetch-switch">
            <div class="oxy-prefetch-switch-wrap text-color-changer">
              <md-switch id="oxy-prefetches-number-status"
                         icons
                         name="oxy_prefetches_number_status" <?php if ($oxy_prefetches_number_status): ?> selected <?php endif; ?>></md-switch>
              <span <?php if ($oxy_prefetches_number_status): ?> class="active" <?php endif; ?>>
              <?php esc_html_e('Number of prefetches (immediate)', 'oxy-prefetch') ?>
            </span>
            </div>
            <md-outlined-text-field class="oxy-prefetch-max-width has-clear-button"
                                    name="oxy_prefetches_number"
                                    value="<?php echo esc_attr($oxy_prefetches_number) ?>"
                                    label="<?php esc_attr_e('The number of links to be prefetched on a category page', 'oxy-prefetch'); ?>"
                                    type="number"
                                    min="1"
                                    max="50"
                                    <?php if (!$oxy_prefetches_number_status): ?>disabled<?php endif; ?>>
              <md-icon-button toggle slot="trailing-icon" type="button">
                <md-icon>cancel</md-icon>
              </md-icon-button>
            </md-outlined-text-field>
          </div>

          <div class="oxy-prefetch-switch">
            <div class="oxy-prefetch-switch-wrap text-color-changer">
              <md-switch id="oxy-prefetch-hover-status"
                         icons
                         name="oxy_prefetch_hover_status" <?php if ($oxy_prefetch_hover_status): ?> selected <?php endif; ?>></md-switch>
              <span <?php if ($oxy_prefetch_hover_status): ?> class="active" <?php endif; ?>>
              <?php esc_html_e('Prefetch links on mouse hover', 'oxy-prefetch') ?>
            </span>
            </div>

            <div class="oxy-prefetch-eagerness">
              <label for="oxy-prefetch-hover-eagerness"><?php esc_html_e('Eagerness', 'oxy-prefetch') ?></label>
              <select id="oxy-prefetch-hover-eagerness" name="oxy_prefetch_hover_eagerness" <?php if (!$oxy_prefetch_hover_status): ?>disabled<?php endif; ?>>
                <?php foreach ($oxy_prefetch_eagerness_options as $value => $label): ?>
                  <option value="<?php echo esc_attr($value) ?>" <?php selected($oxy_prefetch_hover_eagerness, $value) ?>><?php echo esc_html($label) ?></option>
                <?php endforeach; ?>
              </select>
            </div>
          </div>

        </div>

        <div class="oxy-prefetch-card">
          <h2>
            <?php esc_html_e('Prerender', 'oxy-prefetch') ?>
            <i class="dashicons dashicons-editor-help oxy-prefetch-has-tooltip"
               data-tooltip="<?php esc_attr_e('Prerenders the next page completely like an invisible tab.', 'oxy-prefetch') ?>"
               data-href="https://www.oxyplug.com/docs/oxy-prefetch/settings/?utm_source=plugin-settings&utm_medium=wordpress&utm_campaign=oxy-prefetch#prerender-settings"
               data-href-text="<?php esc_attr_e('Learn More', 'oxy-prefetch'); ?>"></i>
          </h2>

          <p class="oxy-prefetch-note oxy-prefetch-caveat">
            <?php esc_html_e('Prerendering runs page scripts in advance. Ensure your analytics/ads support the Prerender2 spec (document.prerendering) to avoid inflated counts.', 'oxy-prefetch') ?>
          </p>

          <div class="oxy-prefetch-switch">
            <div class="oxy-prefetch-switch-wrap text-color-changer">
              <md-switch id="oxy-prefetch-prerender-status"
                         icons
                         name="oxy_prefetch_prerender_number_status" <?php if ($oxy_prefetch_prerender_number_status): ?> selected <?php endif; ?>></md-switch>
              <span <?php if ($oxy_prefetch_prerender_number_status): ?> class="active" <?php endif; ?>>
              <?php esc_html_e('Number of prerenders (immediate)', 'oxy-prefetch') ?>
            </span>
            </div>
            <md-outlined-text-field class="oxy-prefetch-max-width has-clear-button"
                                    name="oxy_prefetch_prerender_number"
                                    value="<?php echo esc_attr($oxy_prefetch_prerender_number) ?>"
                                    label="<?php esc_attr_e('The number of links to be prerendered on a category page', 'oxy-prefetch'); ?>"
                                    type="number"
                                    min="1"
                                    max="10"
                                    <?php if (!$oxy_prefetch_prerender_number_status): ?>disabled<?php endif; ?>>
              <md-icon-button toggle slot="trailing-icon" type="button">
                <md-icon>cancel</md-icon>
              </md-icon-button>
            </md-outlined-text-field>
          </div>

          <div class="oxy-prefetch-switch">
            <div class="oxy-prefetch-switch-wrap text-color-changer">
              <md-switch id="oxy-prefetch-prerender-hover-status"
                         icons
                         name="oxy_prefetch_prerender_hover_status" <?php if ($oxy_prefetch_prerender_hover_status): ?> selected <?php endif; ?>></md-switch>
              <span <?php if ($oxy_prefetch_prerender_hover_status): ?> class="active" <?php endif; ?>>
              <?php esc_html_e('Prerender links on mouse hover', 'oxy-prefetch') ?>
            </span>
            </div>

            <div class="oxy-prefetch-eagerness">
              <label for="oxy-prefetch-prerender-hover-eagerness"><?php esc_html_e('Eagerness', 'oxy-prefetch') ?></label>
              <select id="oxy-prefetch-prerender-hover-eagerness" name="oxy_prefetch_prerender_hover_eagerness" <?php if (!$oxy_prefetch_prerender_hover_status): ?>disabled<?php endif; ?>>
                <?php foreach ($oxy_prefetch_eagerness_options as $value => $label): ?>
                  <option value="<?php echo esc_attr($value) ?>" <?php selected($oxy_prefetch_prerender_hover_eagerness, $value) ?>><?php echo esc_html($label) ?></option>
                <?php endforeach; ?>
              </select>
            </div>
          </div>

          <input type="hidden" name="oxy_prefetch_settings_nonce"
                 value="<?php echo esc_attr(wp_create_nonce('save_prefetch_settings')); ?>"/>
        </div>
      </div>

      <div class="oxy-prefetch-in-row">
        <div class="oxy-prefetch-card">
          <h2>
            <?php esc_html_e('Exclusion', 'oxy-prefetch') ?>
            <small class="oxy-prefetch-smaller"><?php esc_html_e('(Only for moderate)', 'oxy-prefetch') ?></small>
            <i class="dashicons dashicons-editor-help oxy-prefetch-has-tooltip"
               data-tooltip="<?php esc_attr_e('Exclude page(s) from prefetching and prerendering by providing a path (using RegEx is allowed).', 'oxy-prefetch') ?>"
               data-href="https://www.oxyplug.com/docs/oxy-prefetch/settings/?utm_source=plugin-settings&utm_medium=wordpress&utm_campaign=oxy-prefetch#exclusion-settings"
               data-href-text="<?php esc_attr_e('Learn More', 'oxy-prefetch'); ?>"></i>
          </h2>

          <div class="oxy-prefetch-switch">
            <div class="oxy-prefetch-switch-wrap text-color-changer">
              <md-switch id="oxy-prefetch-prerender-href-exclusion-status"
                         icons
                         name="oxy_prefetch_prerender_href_exclusion_status" <?php if ($oxy_prefetch_prerender_href_exclusion_status): ?> selected <?php endif; ?>></md-switch>
              <span <?php if ($oxy_prefetch_prerender_href_exclusion_status): ?> class="active" <?php endif; ?>>
                <?php esc_html_e('href exclusion (RegEx allowed)', 'oxy-prefetch') ?>
              </span>
            </div>

            <ul class="oxy-prefetch-note">
              <li><?php esc_html_e('Exclude links by specifying their paths:', 'oxy-prefetch') ?></li>
              <li><?php esc_html_e('/logout will exclude logout', 'oxy-prefetch') ?></li>
              <li><?php esc_html_e("/(page1|page2)/ will exclude all URLs that begin with 'page1' or 'page2'", 'oxy-prefetch') ?></li>
              <li><?php esc_html_e("/custom_pages/* will exclude all URLs that begin with 'custom_pages' where the * at the end matches anything that follows.", 'oxy-prefetch') ?></li>
            </ul>

            <?php foreach ($oxy_prefetch_prerender_match['href'] as $index => $href): ?>
              <div class="oxy-prefetch-each-exclusion-url">
                <md-outlined-text-field class="oxy-prefetch-max-width has-clear-button"
                                        name="oxy_prefetch_prerender_matches[href][]"
                                        value="<?php echo esc_attr($href) ?>"
                                        label="<?php esc_attr_e('Path', 'oxy-prefetch') ?>"
                                        placeholder="/logout"
                                        type="text"
                                        <?php if (!$oxy_prefetch_prerender_href_exclusion_status): ?>disabled<?php endif; ?>>
                  <md-icon-button toggle slot="trailing-icon" type="button">
                    <md-icon>cancel</md-icon>
                  </md-icon-button>
                </md-outlined-text-field>

                <?php if ($index == 0): ?>
                  <md-icon-button class="oxy-prefetch-remove-exclusion"
                                  toggle
                                  slot="trailing-icon"
                                  type="button"
                                  style="display:none">
                    <md-icon>delete</md-icon>
                  </md-icon-button>
                <?php else: ?>
                  <md-icon-button class="oxy-prefetch-remove-exclusion"
                                  toggle
                                  slot="trailing-icon"
                                  type="button"
                                  <?php if (!$oxy_prefetch_prerender_href_exclusion_status): ?>disabled<?php endif; ?>>
                    <md-icon>delete</md-icon>
                  </md-icon-button>
                <?php endif; ?>
              </div>
            <?php endforeach; ?>
            <md-outlined-button class="oxy-prefetch-add-exclusion"
                                <?php if (!$oxy_prefetch_prerender_href_exclusion_status): ?>disabled<?php endif; ?>>
              <?php esc_html_e('Add More', 'oxy-prefetch') ?>
            </md-outlined-button>
          </div>
        </div>
      </div>

      <div class="oxy-prefetch-in-row">
        <div class="oxy-prefetch-card">
          <h2>
            <?php esc_html_e('No-Vary-Search', 'oxy-prefetch') ?>
            <small class="oxy-prefetch-smaller"><?php esc_html_e('(Only for moderate)', 'oxy-prefetch') ?></small>
            <i class="dashicons dashicons-editor-help oxy-prefetch-has-tooltip"
               data-tooltip="<?php esc_attr_e('Treats URLs that differ only by the listed query parameters as the same page, so a cached prefetch/prerender still matches.', 'oxy-prefetch') ?>"
               data-href="https://developer.chrome.com/docs/web-platform/prerender-pages#no-vary-search"
               data-href-text="<?php esc_attr_e('Learn More', 'oxy-prefetch'); ?>"></i>
          </h2>

          <div class="oxy-prefetch-switch">
            <div class="oxy-prefetch-switch-wrap text-color-changer">
              <md-switch id="oxy-prefetch-no-vary-search-status"
                         icons
                         name="oxy_prefetch_no_vary_search_status" <?php if ($oxy_prefetch_no_vary_search_status): ?> selected <?php endif; ?>></md-switch>
              <span <?php if ($oxy_prefetch_no_vary_search_status): ?> class="active" <?php endif; ?>>
                <?php esc_html_e('Ignore the query parameters below when matching', 'oxy-prefetch') ?>
              </span>
            </div>

            <ul class="oxy-prefetch-note">
              <li><?php esc_html_e('Space- or comma-separated parameter names (e.g. tracking and sort params).', 'oxy-prefetch') ?></li>
            </ul>

            <md-outlined-text-field class="oxy-prefetch-max-width has-clear-button"
                                    name="oxy_prefetch_no_vary_search_params"
                                    value="<?php echo esc_attr($oxy_prefetch_no_vary_search_params) ?>"
                                    label="<?php esc_attr_e('Query parameters to ignore', 'oxy-prefetch') ?>"
                                    type="text"
                                    <?php if (!$oxy_prefetch_no_vary_search_status): ?>disabled<?php endif; ?>>
              <md-icon-button toggle slot="trailing-icon" type="button">
                <md-icon>cancel</md-icon>
              </md-icon-button>
            </md-outlined-text-field>
          </div>
        </div>
      </div>

      <md-filled-button id="oxy-prefetch-settings-save" class="oxy-prefetch-has-loading" type="button">
        <?php esc_html_e('Save', 'oxy-prefetch'); ?>
      </md-filled-button>
      <div class="oxy-prefetch-spinner-wrap">
        <div class="oxy-prefetch-spinner"></div>
        <p><?php esc_html_e('Saving...Please wait.', 'oxy-prefetch'); ?></p>
      </div>

    </div>
    <?php
  }

  /**
   * @return void
   */
  public function add_admin_assets($hook)
  {
    // Load only on the settings page and the post/page/product edit screens.
    if (!in_array($hook, array('tools_page_oxy-prefetch-settings', 'post.php', 'post-new.php'), true)) {
      return;
    }

    wp_register_script('oxy-prefetch-admin-script', plugins_url('assets/js/admin-script.js', __FILE__), array('jquery'), self::OXY_PREFETCH_VERSION);
    wp_enqueue_script('oxy-prefetch-admin-script');

    wp_register_style('oxy-prefetch-admin-style', plugins_url('assets/css/admin-style.css', __FILE__), array(), self::OXY_PREFETCH_VERSION);
    wp_enqueue_style('oxy-prefetch-admin-style');

    wp_localize_script(
      'oxy-prefetch-admin-script',
      'oxy_prefetch_defines',
      array(
        'trans' => array(
          'number_between' => __('The number must be between %d and %d.', 'oxy-prefetch'),
          'success'        => __('Success!', 'oxy-prefetch'),
          'failure'        => __('Failure!', 'oxy-prefetch'),
          'warning'        => __('Warning!', 'oxy-prefetch'),
          'info'           => __('Info', 'oxy-prefetch'),
          'path'           => __('Path', 'oxy-prefetch'),
        )
      )
    );
  }

  /**
   * @return void
   */
  public function add_gutenberg_assets()
  {
    wp_enqueue_script(
      'oxy-prefetch-gutenberg-script',
      plugins_url('assets/js/gutenberg-script.js', __FILE__),
      array('wp-hooks', 'wp-blocks', 'wp-element', 'wp-editor', 'wp-data'),
      filemtime(plugin_dir_path(__FILE__) . 'assets/js/gutenberg-script.js'),
      true
    );
  }

  /**
   * @param $pre_count
   * @param $type
   * @return void
   */
  private function make_speculation_rules($pre_count, $type)
  {
    global $wp;
    global $wp_query;

    for ($p = 0; $p < $pre_count; $p++) {
      if (isset($wp_query->posts[$p]->ID)) {
        $permalink = get_permalink($wp_query->posts[$p]->ID);
        if ($permalink != home_url($wp->request) . '/') {
          if (!isset($this->already_added[$type][$permalink])) {
            if (!$this->is_excluded_by_default($permalink) && !$this->is_excluded_by_user($permalink)) {
              $this->script_immediate[$type][] = $permalink;
            }
            $this->already_added[$type][$permalink] = 1;
          }
        }
      }
    }
  }

  /**
   * Integrate with WordPress core Speculative Loading (shipped in WP 6.8).
   *
   * Core emits its own <script type="speculationrules"> block, so without this
   * the page would ship two competing rule sets. We feed our default path
   * exclusions into core's rules, and when any of our own speculative features
   * are enabled we take over output by suppressing core's block.
   *
   * @return void
   */
  public function integrate_with_core_speculative_loading()
  {
    if (!function_exists('wp_get_speculation_rules')) {
      return;
    }

    // Keep state-changing links safe even when core is the one emitting rules.
    add_filter('wp_speculation_rules_href_exclude_paths', array($this, 'add_core_speculation_exclusions'), 10, 1);

    // Avoid double output: if we manage any rules ourselves, disable core's.
    if ($this->is_any_speculation_feature_enabled()) {
      add_filter('wp_speculation_rules_configuration', '__return_null');
    }
  }

  /**
   * Merge our default path exclusions into core's exclude-paths list.
   *
   * @param mixed $paths
   * @return array
   */
  public function add_core_speculation_exclusions($paths): array
  {
    $paths = is_array($paths) ? $paths : array();

    return array_values(array_unique(array_merge($paths, $this->get_url_exclusions_default())));
  }

  /**
   * @return bool
   */
  private function is_any_speculation_feature_enabled(): bool
  {
    $flags = array(
      get_option('oxy_prefetches_number_status', self::OXY_PREFETCHES_NUMBER_STATUS_DEFAULT),
      get_option('oxy_prefetch_hover_status', self::OXY_PREFETCHES_HOVER_STATUS_DEFAULT),
      get_option('oxy_prefetch_prerender_number_status', self::OXY_PREFETCH_PRERENDER_NUMBER_STATUS_DEFAULT),
      get_option('oxy_prefetch_prerender_hover_status', self::OXY_PREFETCH_PRERENDER_HOVER_STATUS_DEFAULT),
    );

    return in_array('true', $flags, true);
  }

  /**
   * @return void
   */
  public function add_speculation_rules_script()
  {
    $this->add_prefetch_script_immediate();
    $this->add_prerender_script_immediate();
    $this->add_prefetch_script_moderate();
    $this->add_prerender_script_moderate();
    $this->add_to_page();
  }

  /**
   * @return void
   */
  private function add_to_page()
  {
    /**
     * Prefetch and Prerender immediately
     */
    if (count($this->script_immediate)) {

      // Prerender
      if (isset($this->script_immediate['prerender'])) {
        $this->script_immediate['prerender'] = array(
          array(
            'source' => 'list',
            'urls' => $this->script_immediate['prerender'],
            'eagerness' => 'immediate'
          )
        );
      }

      // Prefetch
      if (isset($this->script_immediate['prefetch'])) {
        $this->script_immediate['prefetch'] = array(
          array(
            'source' => 'list',
            'urls' => $this->script_immediate['prefetch'],
            'eagerness' => 'immediate'
          )
        );
      }

      /**
       * Filter the immediate (list-source) speculation rules before output.
       * Returning an empty array suppresses the block — useful for sites that
       * prefer delivering rules via the Speculation-Rules HTTP header.
       */
      $immediate = apply_filters('oxy_prefetch_immediate_rules', $this->script_immediate);
      if (!empty($immediate)) {
        echo
          '<script type="speculationrules">'
          . wp_json_encode($immediate, JSON_UNESCAPED_SLASHES) .
          '</script>';
      }
    }

    /**
     * Prefetch and Prerender on mouse hover
     */
    if (count($this->script_moderate)) {
      /**
       * Filter the moderate (document-source) speculation rules before output.
       */
      $moderate = apply_filters('oxy_prefetch_moderate_rules', $this->script_moderate);
      if (!empty($moderate)) {
        echo
          '<script type="speculationrules">'
          . wp_json_encode($moderate, JSON_UNESCAPED_SLASHES) .
          '</script>';
      }
    }
  }

  /**
   * @return void
   */
  private function add_prefetch_script_immediate()
  {
    global $wp;
    // Prefetch depending on the oxy_prefetches_number
    $oxy_prefetches_number_status = get_option('oxy_prefetches_number_status', self::OXY_PREFETCHES_NUMBER_STATUS_DEFAULT) == 'true';
    if ($oxy_prefetches_number_status) {
      global $wp_query;
      if ($wp_query && $wp_query->posts) {
        $oxy_prefetches_number = get_option('oxy_prefetches_number', self::OXY_PREFETCHES_NUMBER_DEFAULT);
        $posts_count = count($wp_query->posts);
        if ($posts_count < $oxy_prefetches_number) {
          $oxy_prefetches_number = $posts_count;
        }
        $this->make_speculation_rules($oxy_prefetches_number, 'prefetch');
      }
    }

    // Prefetch depending on the oxy_static_prefetch
    $current_url = home_url($wp->request);
    $post_id = url_to_postid($current_url);
    $prefetch_status = get_post_meta($post_id, '_oxy_prefetch_status', true);

    if ($prefetch_status) {
      $prefetch_urls = get_post_meta($post_id, '_oxy_prefetch_url');
      foreach ($prefetch_urls as $prefetch_url) {
        if (!isset($this->already_added['prefetch'][$prefetch_url])) {
          if (!$this->is_excluded_by_default($prefetch_url)) {
            $this->script_immediate['prefetch'][] = $prefetch_url;
          }
          $this->already_added['prefetch'][$prefetch_url] = 1;
        }
      }
    }
  }

  /**
   * @return void
   */
  private function add_prerender_script_immediate()
  {
    global $wp;
    /**
     * Prerender depending on the oxy_prefetch_prerender_number
     */
    $oxy_prefetch_prerender_number_status = get_option('oxy_prefetch_prerender_number_status', self::OXY_PREFETCH_PRERENDER_NUMBER_STATUS_DEFAULT) == 'true';
    if ($oxy_prefetch_prerender_number_status) {
      global $wp_query;
      if ($wp_query && $wp_query->posts) {
        $oxy_prefetch_prerender_number = get_option('oxy_prefetch_prerender_number', self::OXY_PREFETCH_PRERENDER_NUMBER_DEFAULT);
        $posts_count = count($wp_query->posts);
        if ($posts_count < $oxy_prefetch_prerender_number) {
          $oxy_prefetch_prerender_number = $posts_count;
        }
        $this->make_speculation_rules($oxy_prefetch_prerender_number, 'prerender');
      }
    }

    /**
     * Prerender depending on the oxy_static_prerender
     */
    $current_url = home_url($wp->request);
    $post_id = url_to_postid($current_url);
    $prerender_status = get_post_meta($post_id, '_oxy_prefetch_prerender_status', true);

    if ($prerender_status) {
      $prerender_urls = get_post_meta($post_id, '_oxy_prefetch_prerender_url');
      foreach ($prerender_urls as $prerender_url) {
        if (!isset($this->already_added['prerender'][$prerender_url])) {
          if (!$this->is_excluded_by_default($prerender_url)) {
            $this->script_immediate['prerender'][] = $prerender_url;
          }
          $this->already_added['prerender'][$prerender_url] = 1;
        }
      }
    }
  }

  /**
   * @return void
   */
  private function add_prefetch_script_moderate()
  {
    $oxy_prefetch_hover_status = get_option('oxy_prefetch_hover_status', self::OXY_PREFETCHES_HOVER_STATUS_DEFAULT) == 'true';
    if ($oxy_prefetch_hover_status) {
      $this->script_moderate['prefetch'] = array($this->build_document_rule('prefetch'));
    }
  }

  /**
   * Prerender on mouse hover
   * @return void
   */
  private function add_prerender_script_moderate()
  {
    $oxy_prefetch_prerender_hover_status = get_option('oxy_prefetch_prerender_hover_status', self::OXY_PREFETCH_PRERENDER_HOVER_STATUS_DEFAULT) == 'true';
    if ($oxy_prefetch_prerender_hover_status) {
      $this->script_moderate['prerender'] = array($this->build_document_rule('prerender'));
    }
  }

  /**
   * Build a document-source ("moderate") speculation rule for the given type.
   *
   * Includes default path/query exclusions, CSS opt-out (selector_matches),
   * user href exclusions, a configurable eagerness and No-Vary-Search support.
   *
   * @param string $type 'prefetch' | 'prerender'
   * @return array
   */
  private function build_document_rule(string $type): array
  {
    // Base: every same-origin link.
    $where_and = array(
      array('href_matches' => '/*'),
    );

    // Default path exclusions (login, admin, cart/checkout/account, ...).
    foreach ($this->get_url_exclusions_default() as $exclusion) {
      $where_and[] = array('not' => array('href_matches' => $exclusion));
    }

    // Default state-changing query exclusions (add-to-cart, _wpnonce, ...).
    foreach ($this->get_query_string_exclusions_default() as $key) {
      $where_and[] = array('not' => array('href_matches' => '/*\\?*' . $key . '=*'));
    }

    // CSS opt-out: honour .no-prefetch/.no-prerender and rel="nofollow".
    foreach ($this->get_selector_exclusions($type) as $selector) {
      $where_and[] = array('not' => array('selector_matches' => $selector));
    }

    // User-defined href exclusions.
    if (get_option('oxy_prefetch_prerender_href_exclusion_status') == 'true') {
      $user_match = get_option('oxy_prefetch_prerender_match', self::OXY_PREFETCH_PRERENDER_EXCLUSION_DEFAULT);
      if (!empty($user_match['href'][0])) {
        foreach ($user_match['href'] as $href) {
          $where_and[] = array('not' => array('href_matches' => $href));
        }
      }
    }

    $rule = array(
      'source' => 'document',
      'where' => array('and' => $where_and),
      'eagerness' => $this->get_eagerness($type),
    );

    // No-Vary-Search: match URLs that differ only by tracking/sort params.
    $no_vary_search = $this->get_no_vary_search_value();
    if ($no_vary_search !== '') {
      $rule['expects_no_vary_search'] = $no_vary_search;
    }

    return $rule;
  }

  /**
   * Resolve the configured eagerness for a rule type, falling back to default.
   *
   * @param string $type 'prefetch' | 'prerender'
   * @return string
   */
  private function get_eagerness(string $type): string
  {
    $option = $type === 'prerender' ? 'oxy_prefetch_prerender_hover_eagerness' : 'oxy_prefetch_hover_eagerness';
    $value = get_option($option, self::OXY_PREFETCH_EAGERNESS_DEFAULT);

    return in_array($value, self::OXY_PREFETCH_EAGERNESS_VALUES, true) ? $value : self::OXY_PREFETCH_EAGERNESS_DEFAULT;
  }

  /**
   * @param mixed $value
   * @return string
   */
  private function sanitize_eagerness($value): string
  {
    $value = sanitize_text_field((string)$value);

    return in_array($value, self::OXY_PREFETCH_EAGERNESS_VALUES, true) ? $value : self::OXY_PREFETCH_EAGERNESS_DEFAULT;
  }

  /**
   * CSS selectors that opt a link out of speculation.
   *
   * @param string $type 'prefetch' | 'prerender'
   * @return string[]
   */
  private function get_selector_exclusions(string $type): array
  {
    $class = $type === 'prerender' ? '.no-prerender' : '.no-prefetch';
    $selectors = array($class . ', .no-speculation, a[rel~="nofollow"]');

    return apply_filters('oxy_prefetch_selector_exclusions', $selectors, $type);
  }

  /**
   * Build the No-Vary-Search header value (e.g. params=("utm_source" ...)).
   *
   * @return string Empty string when disabled or no params configured.
   */
  private function get_no_vary_search_value(): string
  {
    if (get_option('oxy_prefetch_no_vary_search_status', self::OXY_PREFETCH_NO_VARY_SEARCH_STATUS_DEFAULT) != 'true') {
      return '';
    }

    $raw = (string)get_option('oxy_prefetch_no_vary_search_params', self::OXY_PREFETCH_NO_VARY_SEARCH_PARAMS_DEFAULT);
    $params = preg_split('/[\s,]+/', trim($raw), -1, PREG_SPLIT_NO_EMPTY);
    if (empty($params)) {
      return '';
    }

    $quoted = array();
    foreach ($params as $param) {
      $quoted[] = '"' . $param . '"';
    }

    return 'params=(' . implode(' ', $quoted) . ')';
  }

  /**
   * @return void
   */
  public function dismiss_prerender_notice()
  {
    try {
      if (is_admin() && isset($_POST['oxy_prefetch_dismiss_prerender_notice_nonce'])) {
        if (!current_user_can('manage_options')) {
          wp_send_json_error(array('message' => __('Permission denied.', 'oxy-prefetch')), 403);
        }

        if (wp_verify_nonce($_POST['oxy_prefetch_dismiss_prerender_notice_nonce'], 'dismiss_prerender_notice')) {
          update_option('oxy_prefetch_prerender_notice_dismissed', 'true', false);
          wp_send_json_success(array('message' => __('Successfully Saved.', 'oxy-prefetch')), 200);
        }

        wp_send_json_error(array('message' => __('Wrong Nonce! Refresh the page.', 'oxy-prefetch')), 500);
      }
    } catch (Exception $e) {
      wp_send_json_error(array('message' => $e->getMessage()), 500);
    }

    wp_send_json_error(array('message' => __('Error!', 'oxy-prefetch')), 500);
  }

  /**
   * @return void
   */
  public function dismiss_core_notice()
  {
    try {
      if (is_admin() && isset($_POST['oxy_prefetch_dismiss_core_notice_nonce'])) {
        if (!current_user_can('manage_options')) {
          wp_send_json_error(array('message' => __('Permission denied.', 'oxy-prefetch')), 403);
        }

        if (wp_verify_nonce($_POST['oxy_prefetch_dismiss_core_notice_nonce'], 'dismiss_core_notice')) {
          update_option('oxy_prefetch_core_notice_dismissed', 'true', false);
          wp_send_json_success(array('message' => __('Successfully Saved.', 'oxy-prefetch')), 200);
        }

        wp_send_json_error(array('message' => __('Wrong Nonce! Refresh the page.', 'oxy-prefetch')), 500);
      }
    } catch (Exception $e) {
      wp_send_json_error(array('message' => $e->getMessage()), 500);
    }

    wp_send_json_error(array('message' => __('Error!', 'oxy-prefetch')), 500);
  }

  /**
   * @return void
   */
  public function save_prefetch_settings()
  {
    try {
      if (is_admin() && isset($_POST['oxy_prefetch_settings_nonce'])) {
        if (!current_user_can('manage_options')) {
          wp_send_json_error(array('message' => __('Permission denied.', 'oxy-prefetch')), 403);
        }

        if (wp_verify_nonce($_POST['oxy_prefetch_settings_nonce'], 'save_prefetch_settings')) {

          // Prefetches Number Status
          $oxy_prefetches_number_status = isset($_POST['oxy_prefetches_number_status']) ? 'true' : 'false';

          // Prefetches Number
          if ($oxy_prefetches_number_status == 'true') {
            $oxy_prefetches_number = (int)($_POST['oxy_prefetches_number'] ?? 0);

            if ($oxy_prefetches_number > self::OXY_PREFETCHES_NUMBER_MAX) {
              $message = esc_html(sprintf(__('Max number of prefetches is %d.', 'oxy-prefetch'), self::OXY_PREFETCHES_NUMBER_MAX));
              wp_send_json_error(array('message' => $message), 422);
            }

            if ($oxy_prefetches_number < self::OXY_PREFETCHES_NUMBER_MIN) {
              $message = esc_html(sprintf(__('Min number of prefetches is %d.', 'oxy-prefetch'), self::OXY_PREFETCHES_NUMBER_MIN));
              wp_send_json_error(array('message' => $message), 422);
            }
          } else {
            $oxy_prefetches_number = (int)(get_option('oxy_prefetches_number', self::OXY_PREFETCHES_NUMBER_DEFAULT));
          }

          // Prefetch Hover Status
          $oxy_prefetch_hover_status = isset($_POST['oxy_prefetch_hover_status']) ? 'true' : 'false';

          // Prerender Number Status
          $oxy_prefetch_prerender_number_status = isset($_POST['oxy_prefetch_prerender_number_status']) ? 'true' : 'false';

          // Prerender Number
          if ($oxy_prefetch_prerender_number_status == 'true') {
            $oxy_prefetch_prerender_number = (int)($_POST['oxy_prefetch_prerender_number'] ?? 0);

            if ($oxy_prefetch_prerender_number > self::OXY_PREFETCH_PRERENDER_NUMBER_MAX) {
              $message = esc_html(sprintf(__('Max number of prerenders is %d.', 'oxy-prefetch'), self::OXY_PREFETCH_PRERENDER_NUMBER_MAX));
              wp_send_json_error(array('message' => $message), 422);
            }

            if ($oxy_prefetch_prerender_number < self::OXY_PREFETCH_PRERENDER_NUMBER_MIN) {
              $message = esc_html(sprintf(__('Min number of prerenders is %d.', 'oxy-prefetch'), self::OXY_PREFETCH_PRERENDER_NUMBER_MIN));
              wp_send_json_error(array('message' => $message), 422);
            }
          } else {
            $oxy_prefetch_prerender_number = (int)(get_option('oxy_prefetch_prerender_number', self::OXY_PREFETCH_PRERENDER_NUMBER_DEFAULT));
          }

          // Prerender Hover Status
          $oxy_prefetch_prerender_hover_status = isset($_POST['oxy_prefetch_prerender_hover_status']) ? 'true' : 'false';

          // Eagerness (prefetch & prerender hover/document rules)
          $oxy_prefetch_hover_eagerness = $this->sanitize_eagerness($_POST['oxy_prefetch_hover_eagerness'] ?? '');
          $oxy_prefetch_prerender_hover_eagerness = $this->sanitize_eagerness($_POST['oxy_prefetch_prerender_hover_eagerness'] ?? '');

          // No-Vary-Search
          $oxy_prefetch_no_vary_search_status = isset($_POST['oxy_prefetch_no_vary_search_status']) ? 'true' : 'false';
          $oxy_prefetch_no_vary_search_params = sanitize_text_field($_POST['oxy_prefetch_no_vary_search_params'] ?? self::OXY_PREFETCH_NO_VARY_SEARCH_PARAMS_DEFAULT);
          // Keep only valid URL parameter-name characters (and separators).
          $oxy_prefetch_no_vary_search_params = trim(preg_replace('/[^a-zA-Z0-9_\-,\s]/', '', $oxy_prefetch_no_vary_search_params));
          if ($oxy_prefetch_no_vary_search_params === '') {
            $oxy_prefetch_no_vary_search_params = self::OXY_PREFETCH_NO_VARY_SEARCH_PARAMS_DEFAULT;
          }

          // Prerender Exclusion Status (Href)
          $oxy_prefetch_prerender_href_exclusion_status = isset($_POST['oxy_prefetch_prerender_href_exclusion_status']) ? 'true' : 'false';
          $user_href_exclusions = (array)($_POST['oxy_prefetch_prerender_matches']['href'] ?? array());
          $href_exclusions = array();
          foreach ($user_href_exclusions as $href_exclusion) {
            if (!empty(trim($href_exclusion))) {
              $href_exclusions[] = sanitize_text_field($href_exclusion);
            }
          }

          if (count($href_exclusions)) {
            $oxy_prefetch_prerender_match['href'] = $href_exclusions;
          } else {
            $oxy_prefetch_prerender_match['href'] = self::OXY_PREFETCH_PRERENDER_EXCLUSION_DEFAULT['href'];
          }

          update_option('oxy_prefetches_number_status', $oxy_prefetches_number_status, false);
          update_option('oxy_prefetches_number', $oxy_prefetches_number, false);
          update_option('oxy_prefetch_hover_status', $oxy_prefetch_hover_status, false);
          update_option('oxy_prefetch_prerender_number_status', $oxy_prefetch_prerender_number_status, false);
          update_option('oxy_prefetch_prerender_number', $oxy_prefetch_prerender_number, false);
          update_option('oxy_prefetch_prerender_hover_status', $oxy_prefetch_prerender_hover_status, false);
          update_option('oxy_prefetch_hover_eagerness', $oxy_prefetch_hover_eagerness, false);
          update_option('oxy_prefetch_prerender_hover_eagerness', $oxy_prefetch_prerender_hover_eagerness, false);
          update_option('oxy_prefetch_no_vary_search_status', $oxy_prefetch_no_vary_search_status, false);
          update_option('oxy_prefetch_no_vary_search_params', $oxy_prefetch_no_vary_search_params, false);
          update_option('oxy_prefetch_prerender_href_exclusion_status', $oxy_prefetch_prerender_href_exclusion_status, false);
          if (!empty($oxy_prefetch_prerender_match)) {
            update_option('oxy_prefetch_prerender_match', $oxy_prefetch_prerender_match, false);
          }

          $message = __('Successfully Saved.', 'oxy-prefetch');
          wp_send_json_success(array('message' => $message), 200);
        }

        $message = __('Wrong Nonce! Refresh the page.', 'oxy-prefetch');
      }
    } catch (Exception $e) {
      $message = $e->getMessage();
    }

    $message = $message ?? __('Error!', 'oxy-prefetch');
    wp_send_json_error(array('message' => $message), 500);
  }

  /**
   * @param $post_id
   * @return void
   */
  public function save_prefetch_static_links($post_id)
  {
    // Prevent recursion: wp_update_post() inside save_links_into_db() re-fires save_post.
    if ($this->is_saving) {
      return;
    }

    if (
      (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) ||
      isset($_REQUEST['bulk_edit']) ||
      (!current_user_can('edit_post', $post_id)) ||
      !isset($_POST['oxyplug_prefetch_nonce']) ||
      !wp_verify_nonce($_POST['oxyplug_prefetch_nonce'], basename(__FILE__)) ||
      wp_is_json_request()
    ) {
      return;
    }

    $this->save_links_into_db($post_id);
  }

  /**
   * @return void
   */
  public function add_rest_api()
  {
    register_rest_route('oxy-prefetch/v1', '/save-links/', array(
      'methods' => 'POST',
      'callback' => array($this, 'save_links'),
      'permission_callback' => function () {
        return current_user_can('edit_posts');
      },
    ));
  }

  /**
   * @param WP_REST_Request $request
   * @return void
   */
  public function save_links(WP_REST_Request $request)
  {
    $data = $request->get_body_params();
    if (empty($data['post_id'])) {
      wp_send_json_error(array('message' => __('Missing post ID.', 'oxy-prefetch')), 400);
    }

    $post_id = intval($data['post_id']);
    $_POST = $data;
    if (
      (!(defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)) &&
      !isset($_REQUEST['bulk_edit']) &&
      (current_user_can('edit_post', $post_id)) &&
      isset($_POST['oxyplug_prefetch_nonce']) &&
      wp_verify_nonce($_POST['oxyplug_prefetch_nonce'], basename(__FILE__))
    ) {
      $this->save_links_into_db($post_id, true);
    }

    // Reached only when the checks above failed (a successful save exits inside save_links_into_db).
    wp_send_json_error(array('message' => __('Permission denied or invalid nonce.', 'oxy-prefetch')), 403);
  }

  /**
   * @param $post_id
   * @param bool $ajax
   * @return void
   */
  private function save_links_into_db($post_id, bool $ajax = false)
  {
    // Flag set so the save_post re-fired by wp_update_post() below is ignored.
    $this->is_saving = true;

    $errors = new WP_Error('oxy_prefetch_errors', esc_html__('Oops..something went wrong:', 'oxy-prefetch'));

    // Prefetch
    if (!empty($_POST['oxy_prefetch_status'])) {
      if (!empty($_POST['oxy_static_prefetch']) && is_array($_POST['oxy_static_prefetch'])) {
        $prefetch_urls = array();

        foreach ($_POST['oxy_static_prefetch'] as $oxy_static_prefetch) {
          if (isset($oxy_static_prefetch['prefetch_these'])) {
            $prefetch_these = trim($oxy_static_prefetch['prefetch_these']);
            if (!empty($prefetch_these)) {
              $url_parsed = parse_url($prefetch_these);
              if (!isset($url_parsed['scheme']) || !isset($url_parsed['host'])) {
                $message = esc_html__('The prefetch url is invalid.', 'oxy-prefetch');
                if ($ajax) {
                  wp_send_json_error(array('message' => $message), 422);
                }
                $errors->add('oxy_prefetch_errors', $message);
                break;
              }

              if (!$this->is_url_correct($url_parsed)) {
                $message = esc_html__('The prefetch url must be in your host.', 'oxy-prefetch');
                if ($ajax) {
                  wp_send_json_error(array('message' => $message), 422);
                }
                $errors->add('oxy_prefetch_errors', $message);
                break;
              }

              if (!isset($prefetch_urls[$prefetch_these])) {
                $prefetch_urls[$prefetch_these] = rtrim($prefetch_these, '/') . '/';
              }

            }
          }
        }

        if (count($errors->get_error_messages()) > 1) {
          wp_update_post(array('ID' => $post_id, 'post_status' => 'pending'));
          set_transient('oxy_prefetch_errors', $errors);
        } elseif (count($prefetch_urls)) {
          update_post_meta($post_id, '_oxy_prefetch_status', 1);
          delete_post_meta($post_id, '_oxy_prefetch_url');
          foreach ($prefetch_urls as $prefetch_url) {
            add_post_meta($post_id, '_oxy_prefetch_url', $prefetch_url);
          }
        }
      }
    } else {
      update_post_meta($post_id, '_oxy_prefetch_status', 0);
    }

    // Prerender
    if (!empty($_POST['oxy_prefetch_prerender_status'])) {
      if (!empty($_POST['oxy_static_prerender']) && is_array($_POST['oxy_static_prerender'])) {
        $prerender_urls = array();
        foreach ($_POST['oxy_static_prerender'] as $oxy_static_prerender) {
          if (isset($oxy_static_prerender['prerender_these'])) {
            $prerender_these = trim($oxy_static_prerender['prerender_these']);

            if (!empty($prerender_these)) {
              $url_parsed = parse_url($prerender_these);
              if (!isset($url_parsed['scheme']) || !isset($url_parsed['host'])) {
                $message = esc_html__('The prerender url is invalid.', 'oxy-prefetch');
                if ($ajax) {
                  wp_send_json_error(array('message' => $message), 422);
                }
                $errors->add('oxy_prefetch_errors', $message);
                break;
              }

              if (!$this->is_url_correct($url_parsed)) {
                $message = esc_html__('The prerender url must be in your host.', 'oxy-prefetch');
                if ($ajax) {
                  wp_send_json_error(array('message' => $message), 422);
                }
                $errors->add('oxy_prefetch_errors', $message);
                break;
              }

              if (!isset($prerender_urls[$prerender_these])) {
                $prerender_urls[$prerender_these] = rtrim($prerender_these, '/') . '/';
              }
            }
          }
        }

        if (count($errors->get_error_messages()) > 1) {
          wp_update_post(array('ID' => $post_id, 'post_status' => 'pending'));
          set_transient('oxy_prefetch_errors', $errors);
        } elseif (count($prerender_urls)) {
          update_post_meta($post_id, '_oxy_prefetch_prerender_status', 1);
          delete_post_meta($post_id, '_oxy_prefetch_prerender_url');
          foreach ($prerender_urls as $prefetch_url) {
            add_post_meta($post_id, '_oxy_prefetch_prerender_url', $prefetch_url);
          }
        }
      }
    } else {
      update_post_meta($post_id, '_oxy_prefetch_prerender_status', 0);
    }

    $this->is_saving = false;

    if ($ajax) {
      wp_send_json_success(array('message' => esc_html__('Successfully updated.', 'oxy-prefetch')), 200);
    }
  }

  /**
   * @return void
   */
  public function create_metabox()
  {
    add_meta_box(
      'oxy_prefetch_metabox',
      __('Oxyplug Prefetch & Prerender', 'oxy-prefetch'),
      array($this, 'render_metabox'),
      array('post', 'product', 'page'),
      'normal', // normal: main column | side: sidebar
      'default' // high | core | default | low
    );
  }

  /**
   * @param $post
   * @return void
   */
  public function render_metabox($post)
  {
    wp_nonce_field(basename(__FILE__), 'oxyplug_prefetch_nonce');
    $prefetch_status = get_post_meta($post->ID, '_oxy_prefetch_status', true);
    $prefetch_urls = get_post_meta($post->ID, '_oxy_prefetch_url');
    $prerender_status = get_post_meta($post->ID, '_oxy_prefetch_prerender_status', true);
    $prerender_urls = get_post_meta($post->ID, '_oxy_prefetch_prerender_url');
    ?>

    <div class="oxy-prefetch-statics-wrap">
      <strong><?php esc_html_e("Prerender", 'oxy-prefetch') ?></strong>
      <i class="dashicons dashicons-editor-help oxy-prefetch-has-tooltip"
         data-tooltip="<?php esc_attr_e('Prerenders the next page completely like an invisible tab.', 'oxy-prefetch') ?>"
         data-href="https://www.oxyplug.com/docs/oxy-prefetch/settings/?utm_source=post-settings&utm_medium=wordpress&utm_campaign=oxy-prefetch#prerender-prefetch-edit-page"
         data-href-text="<?php esc_attr_e('Learn More', 'oxy-prefetch'); ?>"></i>

      <div class="oxy-prefetch-switcher">
        <md-switch icons
                   data-name="oxy_prefetch_prerender_status" <?php if ($prerender_status): ?> selected <?php endif ?>></md-switch>
        <input type="hidden" name="oxy_prefetch_prerender_status"
               value="<?php if ($prerender_status) echo esc_attr('on'); ?>">
      </div>

      <h3>
        <?php esc_html_e("Prerender the link(s) below on:", 'oxy-prefetch') ?>
        <strong><?php echo esc_url(urldecode(get_permalink($post))) ?></strong>
      </h3>

      <?php if (count($prerender_urls)): $oxy_i = 0; ?>
        <?php foreach ($prerender_urls as $prerender_url): ?>
          <div class="oxy-prefetch-each-static-url">
            <md-outlined-text-field class="has-clear-button"
                                    data-name="<?php echo esc_attr('oxy_static_prerender[' . $oxy_i . '][prerender_these]') ?>"
                                    value="<?php echo esc_url($prerender_url) ?>"
                                    label="<?php echo esc_attr(sprintf(__("e.g. %s", 'oxy-prefetch'), home_url('post-x'))) ?>"
                                    type="text"
                                    <?php if (!$prerender_status): ?>disabled<?php endif; ?>>
              <md-icon-button toggle slot="trailing-icon" type="button">
                <md-icon>cancel</md-icon>
              </md-icon-button>
            </md-outlined-text-field>
            <md-icon-button class="oxy-prefetch-delete-parent"
                            toggle
                            slot="trailing-icon"
                            type="button"
                            <?php if ($oxy_i == 0): ?>style="display:none"<?php endif; ?>
                            <?php if (!$prerender_status): ?>disabled<?php endif; ?>>
              <md-icon>delete</md-icon>
            </md-icon-button>
            <input type="hidden"
                   name="<?php echo esc_attr('oxy_static_prerender[' . $oxy_i++ . '][prerender_these]') ?>"
                   value="<?php echo esc_url($prerender_url) ?>">
          </div>
        <?php endforeach; ?>
      <?php else: ?>
        <div class="oxy-prefetch-each-static-url">
          <md-outlined-text-field class="has-clear-button"
                                  data-name="<?php echo esc_attr('oxy_static_prerender[0][prerender_these]') ?>"
                                  label="<?php echo esc_attr(sprintf(__("e.g. %s", 'oxy-prefetch'), home_url('post-x'))) ?>"
                                  type="text"
                                  <?php if (!$prerender_status): ?>disabled<?php endif; ?>>
            <md-icon-button toggle slot="trailing-icon" type="button">
              <md-icon>cancel</md-icon>
            </md-icon-button>
          </md-outlined-text-field>
          <md-icon-button class="oxy-prefetch-delete-parent"
                          toggle
                          slot="trailing-icon"
                          style="display:none"
                          type="button">
            <md-icon>delete</md-icon>
          </md-icon-button>
          <input type="hidden" name="<?php echo esc_attr('oxy_static_prerender[0][prerender_these]') ?>">
        </div>
      <?php endif; ?>
      <md-outlined-button class="oxy-prefetch-add-more-static-urls"
                          <?php if (!$prerender_status): ?>disabled<?php endif; ?>>
        <?php esc_html_e('Add More', 'oxy-prefetch') ?>
      </md-outlined-button>

    </div>

    <div class="oxy-prefetch-statics-wrap">
      <strong><?php esc_html_e("Prefetch", 'oxy-prefetch') ?></strong>
      <i class="dashicons dashicons-editor-help oxy-prefetch-has-tooltip"
         data-tooltip="<?php esc_attr_e('Prefetches only the document of the next page.', 'oxy-prefetch') ?>"
         data-href="https://www.oxyplug.com/docs/oxy-prefetch/settings/?utm_source=post-settings&utm_medium=wordpress&utm_campaign=oxy-prefetch#prerender-prefetch-edit-page"
         data-href-text="<?php esc_attr_e('Learn More', 'oxy-prefetch'); ?>"></i>
      <div class="oxy-prefetch-switcher">
        <md-switch icons
                   data-name="oxy_prefetch_status" <?php if ($prefetch_status): ?> selected <?php endif ?>></md-switch>
        <input type="hidden" name="oxy_prefetch_status" value="<?php if ($prefetch_status) echo esc_attr('on'); ?>">
      </div>
      <h3>
        <?php esc_html_e("Prefetch the link(s) below on:", 'oxy-prefetch') ?>
        <strong><?php echo esc_url(urldecode(get_permalink($post))) ?></strong>
      </h3>
      <?php if (count($prefetch_urls)): $oxy_i = 0; ?>
        <?php foreach ($prefetch_urls as $prefetch_url): ?>
          <div class="oxy-prefetch-each-static-url">
            <md-outlined-text-field class="has-clear-button"
                                    data-name="<?php echo esc_attr('oxy_static_prefetch[' . $oxy_i . '][prefetch_these]') ?>"
                                    value="<?php echo esc_url($prefetch_url) ?>"
                                    label="<?php echo esc_attr(sprintf(__("e.g. %s", 'oxy-prefetch'), home_url('post-x'))) ?>"
                                    type="text"
                                    <?php if (!$prefetch_status): ?>disabled<?php endif; ?>>
              <md-icon-button toggle slot="trailing-icon" type="button">
                <md-icon>cancel</md-icon>
              </md-icon-button>
            </md-outlined-text-field>
            <md-icon-button class="oxy-prefetch-delete-parent"
                            toggle
                            slot="trailing-icon"
                            type="button"
                            <?php if ($oxy_i == 0): ?>style="display:none"<?php endif; ?>
                            <?php if (!$prerender_status): ?>disabled<?php endif; ?>>
              <md-icon>delete</md-icon>
            </md-icon-button>
            <input type="hidden"
                   name="<?php echo esc_attr('oxy_static_prefetch[' . $oxy_i++ . '][prefetch_these]') ?>"
                   value="<?php echo esc_url($prefetch_url) ?>">
          </div>
        <?php endforeach; ?>
      <?php else: ?>
        <div class="oxy-prefetch-each-static-url">
          <md-outlined-text-field class="has-clear-button"
                                  data-name="<?php echo esc_attr('oxy_static_prefetch[0][prefetch_these]') ?>"
                                  label="<?php echo esc_attr(sprintf(__("e.g. %s", 'oxy-prefetch'), home_url('post-x'))) ?>"
                                  type="text"
                                  <?php if (!$prefetch_status): ?>disabled<?php endif; ?>>
            <md-icon-button toggle slot="trailing-icon" type="button">
              <md-icon>cancel</md-icon>
            </md-icon-button>
          </md-outlined-text-field>
          <md-icon-button class="oxy-prefetch-delete-parent"
                          toggle
                          slot="trailing-icon"
                          style="display:none"
                          type="button"
                          disabled>
            <md-icon>delete</md-icon>
          </md-icon-button>
          <input type="hidden" name="<?php echo esc_attr('oxy_static_prefetch[0][prefetch_these]') ?>">
        </div>
      <?php endif; ?>
      <md-outlined-button class="oxy-prefetch-add-more-static-urls"
                          <?php if (!$prefetch_status): ?>disabled<?php endif; ?>>
        <?php esc_html_e('Add More', 'oxy-prefetch') ?>
      </md-outlined-button>
    </div>

    <?php
  }

  /**
   * @return void
   */
  public function admin_notices()
  {
    if ($errors = get_transient('oxy_prefetch_errors')) { ?>
      <div class="notice error is-dismissible oxy-prefetch-notice">
      <?php foreach ($errors->get_error_messages() as $error): ?>
        <p><?php echo esc_html($error) ?></p>
      <?php endforeach; ?>
      </div><?php

      delete_transient('oxy_prefetch_errors');
    }

    if ($success_messages = get_transient('oxy_prefetch_success_messages')) { ?>
      <div class="notice notice-success is-dismissible oxy-prefetch-notice">
      <?php foreach ($success_messages->get_error_messages() as $success_message): ?>
        <p><?php echo esc_html($success_message) ?></p>
      <?php endforeach; ?>
      </div><?php

      delete_transient('oxy_prefetch_success_messages');
    }

    $oxy_prefetch_prerender_number_status = get_option('oxy_prefetch_prerender_number_status', self::OXY_PREFETCH_PRERENDER_NUMBER_STATUS_DEFAULT) == 'true';
    $oxy_prefetch_prerender_hover_status = get_option('oxy_prefetch_prerender_hover_status', self::OXY_PREFETCH_PRERENDER_HOVER_STATUS_DEFAULT) == 'true';
    $oxy_prefetch_prerender_notice_dismissed = get_option('oxy_prefetch_prerender_notice_dismissed') == 'true';
    if (
      !$oxy_prefetch_prerender_number_status &&
      !$oxy_prefetch_prerender_hover_status &&
      !$oxy_prefetch_prerender_notice_dismissed
    ) { ?>
      <div class="notice notice-warning is-dismissible oxy-prefetch-notice">
        <p>
          <?php
          $settings_page = admin_url('tools.php?page=oxy-prefetch-settings');
          printf(__('You have not enabled prerender in Oxyplug Prefetch & Prerender %s.', 'oxy-prefetch'), '<a href="' . esc_url($settings_page) . '">' . __('settings', 'oxy-prefetch') . '</a>');
          ?>
          <br><br>
          <button id="oxy-prefetch-dismiss-prerender-notice"
                  data-nonce="<?php echo esc_attr(wp_create_nonce('dismiss_prerender_notice')); ?>"
                  class="button"><?php esc_html_e('Do not show this message again', 'oxy-prefetch') ?></button>
        </p>
      </div>
    <?php }

    // WordPress 6.8+ ships its own Speculative Loading. Let admins know we
    // integrate with it (and suppress core output) to avoid duplicate rules.
    $oxy_prefetch_core_notice_dismissed = get_option('oxy_prefetch_core_notice_dismissed') == 'true';
    if (function_exists('wp_get_speculation_rules') && !$oxy_prefetch_core_notice_dismissed) {
      $screen = get_current_screen();
      if ($screen && $screen->base === 'tools_page_oxy-prefetch-settings') { ?>
        <div class="notice notice-info is-dismissible oxy-prefetch-notice">
          <p>
            <?php esc_html_e('WordPress core Speculative Loading is active on this site. Oxyplug Prefetch & Prerender integrates with it: when any of its features are enabled it manages the speculation rules and suppresses core\'s own block to prevent duplicate, competing rule sets.', 'oxy-prefetch') ?>
            <br><br>
            <button id="oxy-prefetch-dismiss-core-notice"
                    data-nonce="<?php echo esc_attr(wp_create_nonce('dismiss_core_notice')); ?>"
                    class="button"><?php esc_html_e('Do not show this message again', 'oxy-prefetch') ?></button>
          </p>
        </div>
      <?php }
    }
  }

  /**
   * @return void
   */
  public function oxy_prefetch_admin_notices()
  {
    if ($errors = get_transient('oxy_prefetch_errors')) {
      $error_messages = array();
      foreach ($errors->get_error_messages() as $error) {
        $error_messages[] = $error;
      }

      delete_transient('oxy_prefetch_errors');

      wp_send_json_error($error_messages, 422);
    }

    wp_send_json_success(null, 204);
  }

  /**
   * @param $messages
   * @return array|mixed
   */
  public function post_published($messages)
  {
    // When our validation reverted the post to "pending", hide the misleading
    // "Published/Updated" confirmation for the current post type only, so other
    // post types' and other plugins' messages are preserved.
    if (get_transient('oxy_prefetch_errors')) {
      $screen = get_current_screen();
      $post_type = $screen ? $screen->post_type : '';
      if ($post_type && isset($messages[$post_type]) && is_array($messages[$post_type])) {
        $messages[$post_type] = array_fill_keys(array_keys($messages[$post_type]), '');
      }
    }

    return $messages;
  }

  /**
   * @param $actions
   * @param $plugin_file
   * @param $plugin_data
   * @return mixed
   */
  public function add_settings($actions, $plugin_file, $plugin_data)
  {
    if (isset($plugin_data['slug']) && $plugin_data['slug'] == 'oxyplug-prefetch') {
      $href = admin_url('tools.php?page=oxy-prefetch-settings');

      $actions['Settings'] = '<a href="' . $href . '">' . __('Settings', 'oxy-prefetch') . '</a>';
    }

    return $actions;
  }

  /**
   * @param $url_parsed
   * @return bool
   */
  private function is_url_correct($url_parsed): bool
  {
    if (empty($url_parsed['host'])) {
      return false;
    }

    $home_host = strtolower(parse_url(get_home_url(), PHP_URL_HOST));
    $url_host = strtolower($url_parsed['host']);

    // Treat "example.com" and "www.example.com" as the same host.
    $strip_www = static function ($host) {
      return preg_replace('/^www\./', '', (string)$host);
    };

    return $strip_www($home_host) === $strip_www($url_host);
  }

  /**
   * Default path patterns excluded from speculation.
   *
   * The Speculation Rules API warns against speculating state-changing GET
   * links: prerendering them executes them (logging a user out, firing a
   * one-click action, etc.). These ship on by default. Patterns are URL paths
   * (optionally ending with /*), matching the convention used by WordPress
   * core's wp_speculation_rules_href_exclude_paths filter.
   *
   * @return string[]
   */
  private function get_url_exclusions_default(): array
  {
    $paths = array(
      '/wp-login.php',
      '/wp-admin',
      '/wp-admin/*',
      '/wp-comments-post.php',
    );

    if (class_exists('WooCommerce')) {
      $wc_urls = array(
        function_exists('wc_get_cart_url') ? wc_get_cart_url() : '',
        function_exists('wc_get_checkout_url') ? wc_get_checkout_url() : '',
        function_exists('wc_get_page_permalink') ? wc_get_page_permalink('myaccount') : '',
      );

      foreach ($wc_urls as $wc_url) {
        if (empty($wc_url)) {
          continue;
        }
        $wc_path = parse_url($wc_url, PHP_URL_PATH);
        if (empty($wc_path) || $wc_path === '/') {
          continue;
        }
        $wc_path = '/' . trim($wc_path, '/');
        $paths[] = $wc_path;
        $paths[] = $wc_path . '/*';
      }
    }

    return apply_filters('oxy_prefetch_default_url_exclusions', array_values(array_unique($paths)));
  }

  /**
   * Default query-string keys whose presence excludes a link.
   *
   * @return string[]
   */
  private function get_query_string_exclusions_default(): array
  {
    return apply_filters('oxy_prefetch_default_query_exclusions', array(
      'add-to-cart',
      'remove_item',
      'undo_item',
      '_wpnonce',
      '_wp_http_referer',
    ));
  }

  /**
   * @param string $path
   * @param string $pattern path pattern, optionally ending with /* or *
   * @return bool
   */
  private function path_matches_exclusion(string $path, string $pattern): bool
  {
    $base = rtrim($pattern, '*');
    $base = '/' . trim($base, '/');
    if ($base === '/') {
      return false;
    }

    $path = '/' . ltrim($path, '/');

    return $path === $base || str_starts_with($path, $base . '/');
  }

  /**
   * @param $permalink
   * @return bool
   */
  private function is_excluded_by_default($permalink): bool
  {
    $path = parse_url($permalink, PHP_URL_PATH);
    $path = is_string($path) ? $path : '/';

    // Paths excluded
    foreach ($this->get_url_exclusions_default() as $exclusion) {
      if ($this->path_matches_exclusion($path, $exclusion)) {
        return true;
      }
    }

    // Query strings excluded
    $url_parsed = parse_url($permalink);
    if (isset($url_parsed['query'])) {
      mb_parse_str($url_parsed['query'], $string_parsed);
      foreach ($this->get_query_string_exclusions_default() as $exclusion) {
        if (isset($string_parsed[$exclusion])) {
          return true;
        }
      }
    }

    return false;
  }

  /**
   * @param $permalink
   * @return bool
   */
  private function is_excluded_by_user($permalink): bool
  {
    $oxy_prefetch_match = get_option('oxy_prefetch_prerender_match', self::OXY_PREFETCH_PRERENDER_EXCLUSION_DEFAULT);
    $oxy_prefetch_prerender_href_exclusion_status = get_option('oxy_prefetch_prerender_href_exclusion_status');
    if ($oxy_prefetch_prerender_href_exclusion_status == 'true') {
      if (!empty($oxy_prefetch_match['href'][0])) {
        foreach ($oxy_prefetch_match['href'] as $exclusion_href) {
          if (str_starts_with($permalink, home_url($exclusion_href))) {
            return true;
          }
        }
      }
    }

    return false;
  }
}

new OxyPrefetch();