ding_event_unpublishing.module

<?php

/**
 * @file
 * Enables automatic unpublish scheduling for Ding Event content type nodes.
 */

/**
 * Implements hook_form_alter().
 */
function ding_event_unpublishing_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'ding_event_admin_setting_form') {
    $form['ding_event_unpublishing'] = [
      '#type' => 'fieldset',
      '#title' => t('Events un-publish scheduling settings'),
    ];

    $form['ding_event_unpublishing']['ding_event_unpublishing_schedule'] = [
      '#type' => 'checkbox',
      '#title' => t('Enable event un-publish scheduling'),
      '#description' => t('Allow to enable automatic unpublish scheduling.'),
      '#default_value' => variable_get('ding_event_unpublishing_schedule', FALSE),
    ];

    $form['ding_event_unpublishing']['ding_event_unpublishing_schedule_buffer'] = [
      '#type' => 'textfield',
      '#title' => t('Un-publish schedule buffer (in hours)'),
      '#description' => t('The amount of time (<strong>in hours</strong>) after which the event node will be unpublished.'),
      '#default_value' => variable_get('ding_event_unpublishing_schedule_buffer', 0),
      '#size' => 60,
      '#states' => [
        'visible' => [
          ':input[name="ding_event_unpublishing_schedule"]' => ['checked' => TRUE],
        ],
      ],
    ];
  }
}

/**
 * Implements hook_node_presave().
 *
 * @throws \Exception
 */
function ding_event_unpublishing_node_presave($node) {
  if ($node->type !== 'ding_event') {
    return;
  }

  $event_date = $node->field_ding_event_date[LANGUAGE_NONE][0];
  $scheduled_unpublish = variable_get('ding_event_unpublishing_schedule', FALSE);
  $scheduled_unpublish_buffer = variable_get('ding_event_unpublishing_schedule_buffer', 0);

  if ($scheduled_unpublish) {
    $tz_db = new DateTimeZone($event_date['timezone_db']);
    $tz = new DateTimeZone($event_date['timezone']);
    $end_date = DateTime::createFromFormat('Y-m-d H:i:s', $event_date['value2'], $tz_db);
    $buffer_in_seconds = (string) $scheduled_unpublish_buffer * 60 * 60;
    $interval = new DateInterval('PT' . $buffer_in_seconds . 'S');

    if ($event_date['all_day'] == '1') {
      $interval = new DateInterval('P1DT' . $buffer_in_seconds . 'S');
    }

    $node->unpublish_on = $end_date->setTimezone($tz)
      ->add($interval)
      ->getTimestamp();
  }
}