Restaurant Reservations - add reCaptcha

restaurant_reservations_add_recaptcha.php

<?php // don't copy this line
/**
 * @snippet      Add reCaptcha to Restaurant Reservations plugin
 * @sourceCS     https://kybernaut.cz/?p=2992
 * @sourceEN     https://kybernaut.cz/?p=2998
 * @author       Karolína Vyskočilová (https://kybernaut.cz)
 * @testedwith   WordPress 5.2
 * @requires     https://wordpress.org/plugins/invisible-recaptcha/
 */
// -------------------

// Check if both required plugins are activated.
if ( in_array('restaurant-reservations/restaurant-reservations.php', apply_filters('active_plugins', get_option('active_plugins'))) && in_array('invisible-recaptcha/invisible-recaptcha.php', apply_filters('active_plugins', get_option('active_plugins'))) ){

    add_action( 'rtb_booking_form_after_fields', 'kbnt_google_invre_render_widget_action' );
    add_action( 'rtb_validate_booking_submission', 'kbnt_rtb_validate_booking_submission' );
        
}

// Include reCaptcha field.
function kbnt_google_invre_render_widget_action() {
    do_action('google_invre_render_widget_action');
}

// Valide reCaptcha field.
function kbnt_rtb_validate_booking_submission( $booking ) {

    $is_valid = apply_filters('google_invre_is_valid_request_filter', true);
    if ( ! $is_valid ) {
        
        $booking->validation_errors[] = array(
            'field'     => 'name',
            'error_msg' => 'Robot Allert',
            'message'   => __( 'You shall not pass, robot.' ),
        );
    }

}