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PATH: home / grupasm / www / wp-content / plugins / homepage-linker

<?php
/**
 * Plugin Name: Homepage Linker
 * Description: Secure REST endpoint that renders backlinks on the site's homepage. Works with ANY page builder (Elementor, Enfold, Divi, WPBakery) and classic themes — links are injected at render time, not into stored content.
 * Version: 1.5.0
 * Author: WP Backlink Manager
 */

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

// Shared secret — must match HOMEPAGE_LINKER_SECRET in WP Backlink Manager.
// The value below is injected when the plugin is downloaded from the panel.
if (! defined('HOMEPAGE_LINKER_SECRET')) {
    define('HOMEPAGE_LINKER_SECRET', '2bed19b0b56d69d608c6eb7f1b4fcd126fa95009bb098557');
}

define('HOMEPAGE_LINKER_VERSION', '1.5.0');
define('HOMEPAGE_LINKER_OPTION', 'homepage_linker_links');

// ---------------------------------------------------------------------------
// REST endpoint — register / store a link to render on the homepage
// ---------------------------------------------------------------------------

add_action('rest_api_init', function () {
    register_rest_route('homepage-linker/v1', '/place', [
        'methods'             => 'POST',
        'callback'            => 'homepage_linker_place',
        'permission_callback' => '__return_true',
    ]);
});

function homepage_linker_get_links()
{
    $links = get_option(HOMEPAGE_LINKER_OPTION, []);

return is_array($links) ? $links : [];
}

function homepage_linker_place(WP_REST_Request $req)
{
    // Token comes in the body/query (custom headers are often stripped by hosts),
    // with an X-Linker-Token header as a fallback.
    $token = (string) ($req->get_param('token') ?: $req->get_header('x-linker-token'));
    if (! hash_equals(HOMEPAGE_LINKER_SECRET, $token)) {
        return new WP_REST_Response(['success' => false, 'error' => 'unauthorized', 'v' => HOMEPAGE_LINKER_VERSION], 401);
    }

$target = esc_url_raw(trim((string) $req->get_param('target_url')));
    $anchor = sanitize_text_field((string) $req->get_param('anchor'));
    // Optional ready-made HTML block (e.g. AI-generated hidden SEO insert). When
    // present it is rendered verbatim; otherwise we build a simple <p><a> link.
    $html = trim((string) $req->get_param('html'));
    if (! $target || ($anchor === '' && $html === '')) {
        return new WP_REST_Response(['success' => false, 'error' => 'target_url обязателен (и anchor или html)'], 400);
    }

// Unique placement id — lets the same site hold many links (even to the same
    // target) while a re-send of the SAME placement updates instead of duplicating.
    $ref = sanitize_text_field((string) $req->get_param('ref'));

$entry = $html !== ''
        ? ['target' => $target, 'html' => $html]
        : ['target' => $target, 'anchor' => $anchor];
    if ($ref !== '') {
        $entry['ref'] = $ref;
    }

// Store — dedupe by ref when given, else by target URL.
    $links = homepage_linker_get_links();
    $exists = false;
    foreach ($links as &$l) {
        $match = $ref !== ''
            ? (($l['ref'] ?? null) === $ref)
            : (empty($l['ref']) && ($l['target'] ?? null) === $target);
        if ($match) {
            $l = $entry; // refresh on re-send
            $exists = true;
            break;
        }
    }
    unset($l);
    if (! $exists) {
        $links[] = $entry;
    }
    update_option(HOMEPAGE_LINKER_OPTION, $links, true);

homepage_linker_bust_caches();

return new WP_REST_Response([
        'success'        => true,
        'method'         => 'render_hook',
        'v'              => HOMEPAGE_LINKER_VERSION,
        'count'          => count($links),
        'front_page_url' => home_url('/'),
    ], 200);
}

// ---------------------------------------------------------------------------
// Render — output stored links on the homepage, independent of theme/builder
// ---------------------------------------------------------------------------

add_action('wp_footer', function () {
    if (! is_front_page() && ! is_home()) {
        return;
    }

$links = homepage_linker_get_links();
    if (empty($links)) {
        return;
    }

echo '<div class="homepage-linker">';
    foreach ($links as $l) {
        if (! empty($l['html'])) {
            echo $l['html']; // ready-made block (trusted — comes from our panel)
        } elseif (! empty($l['target']) && ! empty($l['anchor'])) {
            echo '<p><a href="'.esc_url($l['target']).'">'.esc_html($l['anchor']).'</a></p>';
        }
    }
    echo '</div>';
}, 99);

// ---------------------------------------------------------------------------

// WP Engine (Varnish / object cache)
    if (class_exists('WpeCommon')) {
        if (method_exists('WpeCommon', 'purge_memcached')) {
            WpeCommon::purge_memcached();
        }
        if (method_exists('WpeCommon', 'purge_varnish_cache')) {
            WpeCommon::purge_varnish_cache();
        }
    }

// LiteSpeed Cache + generic page-cache plugins listening on this hook
    do_action('litespeed_purge_all');
    do_action('cache_flush');

if (class_exists('\\Elementor\\Plugin') && isset(\Elementor\Plugin::$instance->files_manager)) {
        \Elementor\Plugin::$instance->files_manager->clear_cache();
    }
}

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