Import4u Tools für WordPress

<?php
/**
 * Plugin Name: Import4u Free Tools
 * Plugin URI: https://import-4u.com/kostenlose-tools
 * Description: Embeds free Import4u compliance, customs and logistics tools via shortcode. SEO-friendly: keeps a visible do-follow source link to import-4u.com.
 * Version: 1.0.0
 * Author: Import4u
 * Author URI: https://import-4u.com
 * License: GPLv2 or later
 * Text Domain: import4u-tools
 *
 * Usage:
 *   [import4u tool="zollrechner-de" lang="de" height="720"]
 *   [import4u tool="ce-kennzeichnung-check" lang="en"]
 */

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

define( 'IMPORT4U_TOOLS_VERSION', '1.0.0' );
define( 'IMPORT4U_TOOLS_BASE', 'https://import-4u.com' );

function import4u_tools_shortcode( $atts ) {
    $atts = shortcode_atts( array(
        'tool'   => '',
        'lang'   => 'en',
        'height' => '720',
        'title'  => '',
    ), $atts, 'import4u' );

    $slug = sanitize_title( $atts['tool'] );
    if ( '' === $slug ) {
        return '<p class="import4u-error">[import4u] Attribut "tool" fehlt. Slugs: https://import-4u.com/kostenlose-tools</p>';
    }

    $allowed_langs = array( 'de', 'en', 'zh' );
    $lang = in_array( $atts['lang'], $allowed_langs, true ) ? $atts['lang'] : 'en';
    $height = max( 400, absint( $atts['height'] ? $atts['height'] : 720 ) );
    $title_text = sanitize_text_field( $atts['title'] );

    $embed_url  = esc_url( IMPORT4U_TOOLS_BASE . '/embed/tool/' . $slug . '?lang=' . $lang );
    $tool_url   = esc_url( IMPORT4U_TOOLS_BASE . '/kostenloses-tool/' . $slug . '?lang=' . $lang );
    $brand_url  = esc_url( IMPORT4U_TOOLS_BASE );
    $anchor     = $title_text ? esc_html( $title_text ) : 'Import4u Tool';

    static $registered = false;
    if ( ! $registered ) {
        add_action( 'wp_footer', 'import4u_tools_enqueue_loader' );
        $registered = true;
    }

    ob_start();
    ?>
    <span class="import4u-tool-embed" data-slug="<?php echo esc_attr( $slug ); ?>">
        <span class="import4u-tool-embed__frame" style="position:relative;display:block;width:100%;max-width:760px;margin:0 auto;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);">
            <iframe src="<?php echo $embed_url; ?>"
                    width="100%"
                    height="<?php echo esc_attr( $height ); ?>"
                    style="width:100%;height:<?php echo esc_attr( $height ); ?>px;border:0;display:block;"
                    loading="lazy"
                    referrerpolicy="no-referrer-when-downgrade"
                    title="<?php echo esc_attr( $anchor ); ?>"></iframe>
        </span>
        <p class="import4u-tool-embed__credit" style="text-align:center;font-size:13px;margin:10px 0 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:#374151;">
            <a href="<?php echo $tool_url; ?>" target="_blank" rel="noopener noreferrer" style="font-weight:600;color:#111;text-decoration:none;"><?php echo $anchor; ?></a>
            &ndash; Powered by
            <a href="<?php echo $brand_url; ?>" target="_blank" rel="noopener noreferrer" style="font-weight:700;color:#ca8a04;text-decoration:none;">Import4u</a>
        </p>
    </span>
    <?php
    return ob_get_clean();
}
add_shortcode( 'import4u', 'import4u_tools_shortcode' );

function import4u_tools_enqueue_loader() {
    wp_enqueue_script(
        'import4u-tools-embed',
        IMPORT4U_TOOLS_BASE . '/embed.js',
        array(),
        IMPORT4U_TOOLS_VERSION,
        true
    );
}