function node_feed

Page callback: Generates and prints an RSS feed.

Generates an RSS feed from an array of node IDs, and prints it with an HTTP header, with Content Type set to RSS/XML.

Parameters

$nids: (optional) An array of node IDs (nid). Defaults to FALSE so empty feeds can be generated with passing an empty array, if no items are to be added to the feed.

$channel: (optional) An associative array containing 'title', 'link', 'description', and other keys, to be parsed by format_rss_channel() and format_xml_elements(). A list of channel elements can be found at the RSS 2.0 Specification. The link should be an absolute URL.

See also

node_menu()

File

core/modules/node/node.module, line 2163

The core module that allows content to be submitted to the site.

Code

function node_feed($nids = FALSE, $channel = array()) {
  global $base_url, $language_content;
  $rss_config = config('system.core');

  if ($nids === FALSE) {
    $nids = db_select('node', 'n')
      ->fields('n', array('nid', 'created'))
      ->condition('n.promote', 1)
      ->condition('n.status', 1)
      ->orderBy('n.created', 'DESC')
      ->range(0, $rss_config->get('rss_limit'))
      ->addTag('node_access')
      ->execute()
      ->fetchCol();
  }

  $item_length = $rss_config->get('rss_viewmode');
  $namespaces = array('xmlns:dc' => 'http://purl.org/dc/elements/1.1/');

  // Load all nodes to be rendered.
  $nodes = node_load_multiple($nids);
  $items = '';
  foreach ($nodes as $node) {
    $item_text = '';

    $node->link = url("node/$node->nid", array('absolute' => TRUE));
    $node->rss_namespaces = array();
    $account = user_load($node->uid);
    $node->rss_elements = array(
      array('key' => 'pubDate', 'value' => gmdate('r', $node->created)),
      array('key' => 'dc:creator', 'value' => user_format_name($account)),
      array('key' => 'guid', 'value' => $node->nid . ' at ' . $base_url, 'attributes' => array('isPermaLink' => 'false'))
    );

    // The node gets built and modules add to or modify $node->rss_elements
    // and $node->rss_namespaces.
    $build = node_view($node, 'rss');
    unset($build['#theme']);

    if (!empty($node->rss_namespaces)) {
      $namespaces = array_merge($namespaces, $node->rss_namespaces);
    }

    if ($item_length != 'title') {
      // We render node contents and force links to be last.
      $build['links']['#weight'] = 1000;
      $item_text .= backdrop_render($build);
    }

    $items .= format_rss_item($node->title, $node->link, $item_text, $node->rss_elements);
  }

  $channel_defaults = array(
    'version' => '2.0',
    'title' => config_get_translated('system.core', 'site_name'),
    'link' => $base_url,
    'description' => $rss_config->get('rss_description'),
    'language' => $language_content->langcode
  );
  $channel_extras = array_diff_key($channel, $channel_defaults);
  $channel = array_merge($channel_defaults, $channel);

  $output = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
  $output .= "<rss version=\"" . $channel["version"] . "\" xml:base=\"" . $base_url . "\" " . backdrop_attributes($namespaces) . ">\n";
  $output .= format_rss_channel($channel['title'], $channel['link'], $channel['description'], $items, $channel['language'], $channel_extras);
  $output .= "</rss>\n";

  backdrop_add_http_header('Content-Type', 'application/rss+xml; charset=utf-8');
  print $output;
}