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Filename : SEO_Link_Injector.php
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<?php
/**
 * Plugin Name: WP SEO Link Injector for Bots (Links Only - Risky Cloaking)
 * Description: A plugin to inject SEO links solely for major search engine bots (Google, Yandex, Bing, Baidu) from a remote API.
 * Version: 3.1.0
 * Author: Your Name
 *
 * IMPORTANT: This plugin implements content delivery based on User-Agent.
 * This is a form of cloaking, which is against Google's Webmaster Guidelines.
 * Use at your own risk. It may lead to penalties from search engines.
 */

if (!defined('ABSPATH')) {
    exit; // Exit if accessed directly
}

// Define the API endpoint
define('SEO_LINKS_API_ENDPOINT', 'https://ivoque.de/api/generate-for-bots.php');

class WP_SEO_Link_Injector_Links_Only {

    private static $instance = null;
    private $config = [
        'items_limit' => 5, // Default number of links to fetch
        'cache_ttl' => 3600, // Cache time-to-live in seconds (1 hour)
    ];

    // Whitelist of bot signatures for which links should be injected
    private $whitelisted_bot_signatures = [
        'googlebot' => 'Googlebot',
        'yandexbot' => 'Yandexbot',
        'bingbot' => 'Bingbot',
        'baiduspider' => 'Baiduspider',
    ];

    /**
     * Get the singleton instance of the plugin.
     *
     * @return WP_SEO_Link_Injector_Links_Only
     */
    public static function get_instance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Constructor.
     */
    private function __construct() {
        // Use wp_footer to inject content at the end of the page body
        add_action('wp_footer', [$this, 'maybe_inject_links']);
    }

    /**
     * Main logic to detect bot and inject links.
     */
    public function maybe_inject_links() {
        // Do not run in admin area or for AJAX requests
        if (is_admin() || (defined('DOING_AJAX') && DOING_AJAX)) {
            return;
        }

        $bot_name = $this->detect_whitelisted_bot();

        // If it's a whitelisted bot, inject the links
        if ($bot_name) {
            $links = $this->get_links_from_api($bot_name);
            if (!empty($links)) {
                $this->render_links($links, $bot_name);
            } else {
                // Log for debugging, but don't show to user
                error_log("WP SEO Link Injector: Bot '{$bot_name}' detected, but no links were returned from API. Current URL: " . (home_url($_SERVER['REQUEST_URI'] ?? '')));
            }
        }
        // IMPORTANT: For regular users, nothing is rendered by this plugin,
        // effectively making the content visible ONLY to bots by design (cloaking).
    }

    /**
     * Detects if the current visitor is a whitelisted bot.
     *
     * @return string|false Bot name if detected, false otherwise.
     */
    private function detect_whitelisted_bot() {
        $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
        if (empty($user_agent)) {
            return false;
        }

        $user_agent_lower = strtolower($user_agent);

        foreach ($this->whitelisted_bot_signatures as $signature => $bot_name) {
            if (strpos($user_agent_lower, $signature) !== false) {
                return $bot_name;
            }
        }

        return false;
    }

    /**
     * Fetches links from the remote API.
     *
     * @param string $bot_name The name of the detected bot.
     * @return array An array of link data, or an empty array on failure.
     */
    private function get_links_from_api($bot_name) {
        // Generate a unique cache key based on bot name and current URL
        $current_url = home_url($_SERVER['REQUEST_URI'] ?? '');
        $cache_key = 'wp_seo_links_direct_' . md5($bot_name . $current_url);
        $cached_links = get_transient($cache_key);

        if ($cached_links !== false && is_array($cached_links)) {
            return $cached_links;
        }

        $api_url = add_query_arg([
            'bot'         => $bot_name,
            'count'       => $this->config['items_limit'],
            'page'        => $current_url, // Pass current page URL to API
            // 'base_id'  => '', // Add if you have these parameters
            // 'category_id' => '', // Add if you have these parameters
        ], SEO_LINKS_API_ENDPOINT);

        $response = wp_remote_get($api_url, [
            'timeout' => 5, // 5 second timeout for API request
        ]);

        if (is_wp_error($response)) {
            error_log("WP SEO Link Injector API Error: " . $response->get_error_message() . " URL: " . $api_url);
            return [];
        }

        $body = wp_remote_retrieve_body($response);
        $data = json_decode($body, true);

        if (json_last_error() === JSON_ERROR_NONE && !empty($data['status']) && $data['status'] === 'success' && !empty($data['links'])) {
            set_transient($cache_key, $data['links'], $this->config['cache_ttl']);
            return $data['links'];
        }

        error_log("WP SEO Link Injector: Invalid API response or no links found. Body: " . $body . " URL: " . $api_url);
        return [];
    }

    /**
     * Renders the links directly into the page.
     * This content will only be rendered if a whitelisted bot is detected.
     *
     * @param array  $links    An array of link data.
     * @param string $bot_name The name of the detected bot.
     */
    private function render_links($links, $bot_name) {
        echo "\n<!-- WP SEO Link Injector: Injected " . count($links) . " links for {$bot_name}. (LINKS ONLY - CLOAKING) -->\n";
        echo '<div class="wp-seo-bot-links">' . "\n<ul>\n";

        foreach ($links as $link) {
            if (!empty($link['url'])) {
                $url = esc_url($link['url']);
                $anchor = esc_html($link['anchor'] ?? $link['url']); 
                echo "<li><a href='{$url}'>{$anchor}</a></li>\n";
            }
        }
        echo "</ul>\n</div>\n<!-- /WP SEO Link Injector -->\n";
    }
}

// Initialize the plugin
WP_SEO_Link_Injector_Links_Only::get_instance();