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Edit File: SotActionNewsletter.php

<?php
namespace NinjaForms\Includes\Abstracts;
use NinjaForms\Includes\Abstracts\SotAction;
use NinjaForms\Includes\Interfaces\SotAction as InterfacesSotAction;

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

/**
 * Class SotActionNewsletter
 */
abstract class SotActionNewsletter extends SotAction implements InterfacesSotAction
{
    /**
     * @var array
     */
    protected $_tags = array('newsletter');

protected $_settings = array();

protected $_transient = '';

protected $_transient_expiration = '';

protected $_setting_labels = array(
        'list'   => 'List',
        'fields' => 'List Field Mapping',
        'groups' => 'Interest Groups',
    );

/**
     * Constructor
     */
    public function __construct()
    {
        parent::__construct();

if (! $this->_transient) {
            $this->_transient = $this->get_name() . '_newsletter_lists';
        }

/**
         * Ajax call handled in '_get_lists', but bulk of work could be done in
         * the NewsLetter class that extends this class
         */
        add_action('wp_ajax_nf_' . $this->_name . '_get_lists', array($this, '_get_lists'));

add_action('init',[$this,'newsletterAbstractInit'],8);
    }

public function newsletterAbstractInit(): void
    {
        $this->get_list_settings();
    }

/*
    * PUBLIC METHODS
    */

public function _get_lists()
    {
        check_ajax_referer('ninja_forms_builder_nonce', 'security');

$lists = $this->get_lists();

array_unshift($lists, array('value' => 0, 'label' => '-', 'fields' => array(), 'groups' => array()));

$this->cache_lists($lists);

echo wp_json_encode(array('lists' => $lists));

wp_die(); // this is required to terminate immediately and return a proper response
    }

/*
     * PROTECTED METHODS
     */

abstract protected function get_lists();

/*
     * PRIVATE METHODS
     */

private function get_list_settings()
    {
        $label_defaults = array(
            'list'   => 'List',
            'fields' => 'List Field Mapping',
            'groups' => 'Interest Groups',
        );
        $labels = array_merge($label_defaults, $this->_setting_labels);

$prefix = $this->get_name();

$lists = get_transient($this->_transient);

if (! $lists) {
            $lists = $this->get_lists();
            $this->cache_lists($lists);
        }

if (empty($lists)) return;

$this->_settings[$prefix . 'newsletter_list'] = array(
            'name' => 'newsletter_list',
            'type' => 'select',
            'label' => $labels['list'] . ' <a class="js-newsletter-list-update extra"><span class="dashicons dashicons-update"></span></a>',
            'width' => 'full',
            'group' => 'primary',
            'value' => '0',
            'options' => array(),
        );

$fields = array();
        foreach ($lists as $list) {
            $this->_settings[$prefix . 'newsletter_list']['options'][] = $list;

//Check to see if list has fields array set.
            if (isset($list['fields'])) {

foreach ($list['fields'] as $field) {
                    $name = $list['value'] . '_' . $field['value'];
                    $fields[] = array(
                        'name' => $name,
                        'type' => 'textbox',
                        'label' => $field['label'],
                        'width' => 'full',
                        'use_merge_tags' => array(
                            'exclude' => array(
                                'user',
                                'post',
                                'system',
                                'querystrings'
                            )
                        )
                    );
                }
            }
        }

$this->_settings[$prefix . 'newsletter_list_fields'] = array(
            'name' => 'newsletter_list_fields',
            'label' => esc_html__('List Field Mapping', 'ninja-forms'),
            'type' => 'fieldset',
            'group' => 'primary',
            'settings' => array()
        );

$this->_settings[$prefix . 'newsletter_list_groups'] = array(
            'name' => 'newsletter_list_groups',
            'label' => esc_html__('Interest Groups', 'ninja-forms'),
            'type' => 'fieldset',
            'group' => 'primary',
            'settings' => array()
        );
    }

private function cache_lists($lists)
    {
        set_transient($this->_transient, $lists, $this->_transient_expiration);
    }
}

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