AjaxColumnValue.php

<?php

namespace AC\Controller;

use AC\Ajax;
use AC\Column\AjaxValue;
use AC\ListScreenRepository\Storage;
use AC\Registerable;
use AC\Type\ListScreenId;

class AjaxColumnValue implements Registerable
{

    private $repository;

    public function __construct(Storage $repository)
    {
        $this->repository = $repository;
    }

    public function register(): void
    {
        $this->get_ajax_handler()->register();
    }

    private function get_ajax_handler()
    {
        $handler = new Ajax\Handler();
        $handler
            ->set_action('ac_get_column_value')
            ->set_callback([$this, 'get_value']);

        return $handler;
    }

    public function get_value()
    {
        check_ajax_referer('ac-ajax');

        // Get ID of entry to edit
        $id = (int)filter_input(INPUT_POST, 'pk');

        if ( ! $id) {
            wp_send_json_error(__('Invalid item ID.', 'codepress-admin-columns'), 400);
        }

        $list_id = filter_input(INPUT_POST, 'layout');

        if ( ! ListScreenId::is_valid_id($list_id)) {
            wp_send_json_error(__('Invalid list ID.', 'codepress-admin-columns'), 400);
        }

        $list_screen = $this->repository->find(new ListScreenId($list_id));

        if ( ! $list_screen || ! $list_screen->is_user_allowed(wp_get_current_user())) {
            wp_send_json_error(__('Invalid list screen.', 'codepress-admin-columns'), 400);
        }

        $column = $list_screen->get_column_by_name(filter_input(INPUT_POST, 'column'));

        if ( ! $column) {
            wp_send_json_error(__('Invalid column.', 'codepress-admin-columns'), 400);
        }

        if ( ! $column instanceof AjaxValue) {
            wp_send_json_error(__('Invalid method.', 'codepress-admin-columns'), 400);
        }

        // Trigger ajax callback
        echo $column->get_ajax_value($id);
        exit;
    }

}