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<?php
namespace Drupal\aggregator\Form;
use Drupal\aggregator\FeedStorageInterface;
use Drupal\Component\Utility\UrlHelper;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\ClientInterface;
/**
* Imports feeds from OPML.
*/
class OpmlFeedAdd extends FormBase {
/**
* The feed storage.
*
* @var \Drupal\aggregator\FeedStorageInterface
*/
protected $feedStorage;
/**
* The HTTP client to fetch the feed data with.
*
* @var \GuzzleHttp\ClientInterface
*/
protected $httpClient;
/**
* Constructs a database object.
*
* @param \Drupal\aggregator\FeedStorageInterface $feed_storage
* The feed storage.
* @param \GuzzleHttp\ClientInterface $http_client
* The Guzzle HTTP client.
*/
public function __construct(FeedStorageInterface $feed_storage, ClientInterface $http_client) {
$this->feedStorage = $feed_storage;
$this->httpClient = $http_client;
}
/**
* {@inheritdoc}
*/
public static function create(ContainerInterface $container) {
return new static(
$container->get('entity.manager')->getStorage('aggregator_feed'),
$container->get('http_client')
);
}
/**
* {@inheritdoc}
*/
public function getFormId() {
return 'aggregator_opml_add';
}
/**
* {@inheritdoc}
*/
public function buildForm(array $form, FormStateInterface $form_state) {
$intervals = [900, 1800, 3600, 7200, 10800, 21600, 32400, 43200, 64800, 86400, 172800, 259200, 604800, 1209600, 2419200];
$period = array_map([\Drupal::service('date.formatter'), 'formatInterval'], array_combine($intervals, $intervals));
$form['upload'] = [
'#type' => 'file',
'#title' => $this->t('OPML File'),
'#description' => $this->t('Upload an OPML file containing a list of feeds to be imported.'),
];
$form['remote'] = [
'#type' => 'url',
'#title' => $this->t('OPML Remote URL'),
'#maxlength' => 1024,
'#description' => $this->t('Enter the URL of an OPML file. This file will be downloaded and processed only once on submission of the form.'),
];
$form['refresh'] = [
'#type' => 'select',
'#title' => $this->t('Update interval'),
'#default_value' => 3600,
'#options' => $period,
'#description' => $this->t('The length of time between feed updates. Requires a correctly configured <a href=":cron">cron maintenance task</a>.', [':cron' => $this->url('system.status')]),
];
$form['actions'] = ['#type' => 'actions'];
$form['actions']['submit'] = [
'#type' => 'submit',
'#value' => $this->t('Import'),
];
return $form;
}
/**
* {@inheritdoc}
*/
public function validateForm(array &$form, FormStateInterface $form_state) {
// If both fields are empty or filled, cancel.
$all_files = $this->getRequest()->files->get('files', []);
if ($form_state->isValueEmpty('remote') == empty($all_files['upload'])) {
$form_state->setErrorByName('remote', $this->t('<em>Either</em> upload a file or enter a URL.'));
}
}
/**
* {@inheritdoc}
*/
public function submitForm(array &$form, FormStateInterface $form_state) {
$validators = ['file_validate_extensions' => ['opml xml']];
if ($file = file_save_upload('upload', $validators, FALSE, 0)) {
$data = file_get_contents($file->getFileUri());
}
else {
// @todo Move this to a fetcher implementation.
try {
$response = $this->httpClient->get($form_state->getValue('remote'));
$data = (string) $response->getBody();
}
catch (RequestException $e) {
$this->logger('aggregator')->warning('Failed to download OPML file due to "%error".', ['%error' => $e->getMessage()]);
drupal_set_message($this->t('Failed to download OPML file due to "%error".', ['%error' => $e->getMessage()]));
return;
}
}
$feeds = $this->parseOpml($data);
if (empty($feeds)) {
drupal_set_message($this->t('No new feed has been added.'));
return;
}
// @todo Move this functionality to a processor.
foreach ($feeds as $feed) {
// Ensure URL is valid.
if (!UrlHelper::isValid($feed['url'], TRUE)) {
drupal_set_message($this->t('The URL %url is invalid.', ['%url' => $feed['url']]), 'warning');
continue;
}
// Check for duplicate titles or URLs.
$query = $this->feedStorage->getQuery();
$condition = $query->orConditionGroup()
->condition('title', $feed['title'])
->condition('url', $feed['url']);
$ids = $query
->condition($condition)
->execute();
$result = $this->feedStorage->loadMultiple($ids);
foreach ($result as $old) {
if (strcasecmp($old->label(), $feed['title']) == 0) {
drupal_set_message($this->t('A feed named %title already exists.', ['%title' => $old->label()]), 'warning');
continue 2;
}
if (strcasecmp($old->getUrl(), $feed['url']) == 0) {
drupal_set_message($this->t('A feed with the URL %url already exists.', ['%url' => $old->getUrl()]), 'warning');
continue 2;
}
}
$new_feed = $this->feedStorage->create([
'title' => $feed['title'],
'url' => $feed['url'],
'refresh' => $form_state->getValue('refresh'),
]);
$new_feed->save();
}
$form_state->setRedirect('aggregator.admin_overview');
}
/**
* Parses an OPML file.
*
* Feeds are recognized as <outline> elements with the attributes "text" and
* "xmlurl" set.
*
* @param string $opml
* The complete contents of an OPML document.
*
* @return array
* An array of feeds, each an associative array with a "title" and a "url"
* element, or NULL if the OPML document failed to be parsed. An empty array
* will be returned if the document is valid but contains no feeds, as some
* OPML documents do.
*
* @todo Move this to a parser in https://www.drupal.org/node/1963540.
*/
protected function parseOpml($opml) {
$feeds = [];
$xml_parser = xml_parser_create();
xml_parser_set_option($xml_parser, XML_OPTION_TARGET_ENCODING, 'utf-8');
if (xml_parse_into_struct($xml_parser, $opml, $values)) {
foreach ($values as $entry) {
if ($entry['tag'] == 'OUTLINE' && isset($entry['attributes'])) {
$item = $entry['attributes'];
if (!empty($item['XMLURL']) && !empty($item['TEXT'])) {
$feeds[] = ['title' => $item['TEXT'], 'url' => $item['XMLURL']];
}
}
}
}
xml_parser_free($xml_parser);
return $feeds;
}
}