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Editing: sidebar-generator.php

<?php
/**
 * @author  RadiusTheme
 * @since   1.0
 * @version 1.0
 */

namespace radiustheme\Koncrete_core;

use radiustheme\Koncrete\Helper;

class Sidebar_Generator {

protected static $instance = null;

public $prefix      = null;
  public $version     = null;
  public $option_name = null;

public function __construct() {
    $this->prefix  = Constants::$theme_prefix;
    $this->version = Constants::$theme_version;
    $this->option_name = $this->prefix . '_custom_sidebars';

add_action( 'sidebar_admin_page', array( $this, 'sidebar_form' ) );
    add_action( 'init' , array( $this, 'register_sidebars' ) );
    add_action( 'admin_enqueue_scripts', array( $this, 'load_scripts' ) );

add_action( 'wp_ajax_rdtheme_add_sidebar' , array( $this, 'ajax_add_sidebar' ) );
    add_action( 'wp_ajax_rdtheme_remove_sidebar', array( $this, 'ajax_remove_sidebar' ) );
  }

public static function instance() {
    if ( null == self::$instance ) {
      self::$instance = new self;
    }
    return self::$instance;
  }

public function sidebar_form() {
    ?>
    <div class="widgets-holder-wrap">
      <div id="rdtheme-new-sidebar" class="widgets-sortables">
        <div class="sidebar-name">
          <div class="sidebar-name-arrow"></div>
          <h2><?php esc_html_e( 'Add New Sidebar', 'koncrete-core' ); ?><span class="spinner"></span></h2>
        </div>
        <div class="sidebar-description">
          <form style="padding:0 7px;" method="POST" action="<?php echo esc_url( admin_url( 'admin-ajax.php?action=rdtheme_add_sidebar' ) );?>">
            <?php wp_nonce_field( 'rdtheme_add_sidebar' ); ?>
            <table class="form-table">
              <tr>
                <th scope="row"><?php esc_html_e( 'Name', 'koncrete-core' ) ?></th>
                <td><input type="text" class="text" name="name" value=""></td>
                <td><input type="submit" class="button-primary" value="<?php esc_html_e( 'Add', 'koncrete-core' ) ?>"></td>
              </tr>
            </table>
          </form>
        </div>
      </div>
    </div>
    <?php
  }

public function register_sidebars() {
    $sidebars = get_option( $this->option_name, array() );

if ( !$sidebars ) return;

foreach ( $sidebars as $sidebar ) {
      register_sidebar( $sidebar );
    }
  }

public function load_scripts() {
    $screen = get_current_screen();

if ( $screen->id != 'widgets' ) return;

wp_enqueue_script( 'admin-sidebar-generator', Helper::get_js( 'admin-sidebar-generator' ), array( 'jquery' ), $this->version );

$localize_data = array(
      'confirm'  => esc_html__( 'Are you sure you want to remove this custom sidebar', 'koncrete-core' ),
      'failed'   => esc_html__( 'Operation failed' , 'koncrete-core' ),
      'ajaxurl'  => admin_url( 'admin-ajax.php?action=rdtheme_remove_sidebar' ),
      'nonce'    => wp_create_nonce( 'rdtheme_remove_sidebar' ),
    );

wp_localize_script( 'admin-sidebar-generator', 'RDThemeSidebarObj', $localize_data );
  }

public function ajax_add_sidebar() {
    $name  = isset( $_REQUEST['name'] ) ? sanitize_text_field( $_REQUEST['name'] ) : null;
    $nonce = isset( $_REQUEST['_wpnonce'] ) ? sanitize_text_field( $_REQUEST['_wpnonce'] ) : null;

if ( empty( $name ) ) {
      wp_send_json_error( esc_html__( "Sidebar name can't be empty", 'koncrete-core' ) );
    }
    if ( empty( $nonce ) ) {
      wp_send_json_error( esc_html__( 'Empty nonce', 'koncrete-core' ) );
    }
    if ( ! wp_verify_nonce( $nonce, 'rdtheme_add_sidebar' ) ) {
      wp_send_json_error( esc_html__( 'Invalid nonce', 'koncrete-core' ) );
    }

$id = 'rdtheme-sidebar-' . sanitize_title( $name );
    $sidebars = get_option( $this->option_name, array() );

if ( array_key_exists( $id, $sidebars ) ) {
      wp_send_json_error( esc_html__( 'Sidebar with the same name already exists. Please choose a different name', 'koncrete-core' ) );
    }

$sidebars[$id] = array(
      'id'             => $id,
      'name'           => $name,
      'class'          => 'rdtheme-custom',
      'description'    => '',
      'before_widget'  => '<aside id="%1$s" class="widget %2$s">',
      'after_widget'   => '</aside>',
      'before_title'   => '<h3 class="widget-title title-bar-xl1">',
      'after_title'    => '</h3>',
    );

update_option( $this->option_name, $sidebars );

if ( ! function_exists( 'wp_list_widget_controls' ) ) {
      include_once ABSPATH . 'wp-admin/includes/widgets.php';
    }

ob_start();
    ?>
    <div class="widgets-holder-wrap sidebar-rdtheme-custom closed">
      <?php wp_list_widget_controls( $id, $name ); ?>
    </div>
    <?php
    wp_send_json_success( ob_get_clean() );
  }

public function ajax_remove_sidebar() {
    $id    = isset( $_REQUEST['id'] ) ? sanitize_text_field( $_REQUEST['id'] ) : null;
    $nonce = isset( $_REQUEST['_wpnonce'] ) ? sanitize_text_field( $_REQUEST['_wpnonce'] ) : null;

if ( empty( $id ) ) {
      wp_send_json_error( esc_html__( 'Sidebar ID not found', 'koncrete-core' ) );
    }
    if ( empty( $nonce ) ) {
      wp_send_json_error( esc_html__( 'Empty nonce', 'koncrete-core' ) );
    }
    if ( ! wp_verify_nonce( $nonce, 'rdtheme_remove_sidebar' ) ) {
      wp_send_json_error( esc_html__( 'Invalid nonce', 'koncrete-core' ) );
    }

$sidebars = get_option( $this->option_name, array() );

unset( $sidebars[ $id ] );

update_option( $this->option_name, $sidebars );

wp_send_json_success();
  }
}

Sidebar_Generator::instance();