varbase_youtube_import.module

<?php

/**
 * @file
 * Varbase YouTube Import hook implementations.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Entity\EntityInterface;

/**
 * Implements form_alter().
 */
function varbase_youtube_import_form_alter(&$form, FormStateInterface &$form_state, $form_id) {
  if ($form_id == 'feeds_feed_youtube_channel_form') {
    $form['plugin']['fetcher']['source']['#description'] = t('This field should contain a youtube channel link.');
    $form['plugin']['fetcher']['source']['#title'] = t('YouTube URL');
  }
  elseif ($form_id == 'feeds_feed_youtube_playlist_form') {
    $form['plugin']['fetcher']['source']['#description'] = t('This field should contain a youtube playlist link.');
    $form['plugin']['fetcher']['source']['#title'] = t('YouTube URL');
  }
}

/**
 * Implements entity_presave().
 *
 * This function will used to replace the youtube playlist/channel
 * link to their RSS feed link.
 */
function varbase_youtube_import_entity_presave(EntityInterface $entity) {
  if ($entity->getEntityType()->id() == 'feeds_feed') {
    if ($entity->get('type')->target_id == 'youtube_channel') {
      if (strpos($entity->get('source')->value, 'googleapis') == FALSE) {
        $api = $entity->get('field_api_key')->value;
        $link = $entity->get('source')->value;
        $pos = strpos($link, '/channel/');
        $link_id = substr($link, $pos + 9);
        $feed_link = 'https://www.googleapis.com/youtube/v3/search?order=date&part=snippet&type=video&channelId=' . $link_id . '&maxResults=50&key=' . $api;
        $entity->set('source', $feed_link, TRUE);
      }
      else {
        $field_api = $entity->get('field_api_key')->value;
        $link = $entity->get('source')->value;
        $key_pos = strpos($link, '&key=');
        $token_pos = strpos($link, '&pageToken=');
        $old_api = substr($link, $key_pos + 5);
        if ($old_api !== $field_api) {
          if (!(strpos($entity->get('source')->value, 'pageToken'))) {
            $feed_link = substr($entity->get('source')->value, 0, $key_pos);
            $feed_link = $feed_link . '&key=' . $field_api;
            $entity->set('source', $feed_link, TRUE);
          }
          else {
            $feed_link = substr($entity->get('source')->value, 0, $key_pos);
            $token = substr($entity->get('source')->value, $token_pos + 11);
            $feed_link = $feed_link . '&key=' . $field_api . '&pageToken=' . $token;
            $entity->set('source', $feed_link, TRUE);
          }
        }
      }
    }
    elseif ($entity->get('type')->target_id == 'youtube_playlist') {
      if (strpos($entity->get('source')->value, 'googleapis') == FALSE) {
        $api = $entity->get('field_api_key')->value;
        $link = $entity->get('source')->value;
        $pos = strpos($link, 'list=');
        $link_id = substr($link, $pos + 5);
        $feed_link = 'https://www.googleapis.com/youtube/v3/playlistItems?order=date&part=snippet&playlistId=' . $link_id . '&maxResults=50&key=' . $api;
        $entity->set('source', $feed_link, TRUE);
      }
      else {
        $field_api = $entity->get('field_api_key')->value;
        $link = $entity->get('source')->value;
        $key_pos = strpos($link, '&key=');
        $token_pos = strpos($link, '&pageToken=');
        $old_api = substr($link, $key_pos + 5);
        if ($old_api !== $field_api) {
          if (!(strpos($entity->get('source')->value, 'pageToken'))) {
            $feed_link = substr($entity->get('source')->value, 0, $key_pos);
            $feed_link = $feed_link . '&key=' . $field_api;
            $entity->set('source', $feed_link, TRUE);
          }
          else {
            $feed_link = substr($entity->get('source')->value, 0, $key_pos);
            $token = substr($entity->get('source')->value, $token_pos + 11);
            $feed_link = $feed_link . '&key=' . $field_api . '&pageToken=' . $token;
            $entity->set('source', $feed_link, TRUE);
          }
        }
      }
    }
  }
}