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<?php
namespace Drupal\views\Plugin\views\row;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
/**
* Renders an RSS item based on fields.
*
* @ViewsRow(
* id = "rss_fields",
* title = @Translation("Fields"),
* help = @Translation("Display fields as RSS items."),
* theme = "views_view_row_rss",
* display_types = {"feed"}
* )
*/
class RssFields extends RowPluginBase {
/**
* Does the row plugin support to add fields to it's output.
*
* @var bool
*/
protected $usesFields = TRUE;
protected function defineOptions() {
$options = parent::defineOptions();
$options['title_field'] = ['default' => ''];
$options['link_field'] = ['default' => ''];
$options['description_field'] = ['default' => ''];
$options['creator_field'] = ['default' => ''];
$options['date_field'] = ['default' => ''];
$options['guid_field_options']['contains']['guid_field'] = ['default' => ''];
$options['guid_field_options']['contains']['guid_field_is_permalink'] = ['default' => TRUE];
return $options;
}
public function buildOptionsForm(&$form, FormStateInterface $form_state) {
parent::buildOptionsForm($form, $form_state);
$initial_labels = ['' => $this->t('- None -')];
$view_fields_labels = $this->displayHandler->getFieldLabels();
$view_fields_labels = array_merge($initial_labels, $view_fields_labels);
$form['title_field'] = [
'#type' => 'select',
'#title' => $this->t('Title field'),
'#description' => $this->t('The field that is going to be used as the RSS item title for each row.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['title_field'],
'#required' => TRUE,
];
$form['link_field'] = [
'#type' => 'select',
'#title' => $this->t('Link field'),
'#description' => $this->t('The field that is going to be used as the RSS item link for each row. This must be a drupal relative path.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['link_field'],
'#required' => TRUE,
];
$form['description_field'] = [
'#type' => 'select',
'#title' => $this->t('Description field'),
'#description' => $this->t('The field that is going to be used as the RSS item description for each row.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['description_field'],
'#required' => TRUE,
];
$form['creator_field'] = [
'#type' => 'select',
'#title' => $this->t('Creator field'),
'#description' => $this->t('The field that is going to be used as the RSS item creator for each row.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['creator_field'],
'#required' => TRUE,
];
$form['date_field'] = [
'#type' => 'select',
'#title' => $this->t('Publication date field'),
'#description' => $this->t('The field that is going to be used as the RSS item pubDate for each row. It needs to be in RFC 2822 format.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['date_field'],
'#required' => TRUE,
];
$form['guid_field_options'] = [
'#type' => 'details',
'#title' => $this->t('GUID settings'),
'#open' => TRUE,
];
$form['guid_field_options']['guid_field'] = [
'#type' => 'select',
'#title' => $this->t('GUID field'),
'#description' => $this->t('The globally unique identifier of the RSS item.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['guid_field_options']['guid_field'],
'#required' => TRUE,
];
$form['guid_field_options']['guid_field_is_permalink'] = [
'#type' => 'checkbox',
'#title' => $this->t('GUID is permalink'),
'#description' => $this->t('The RSS item GUID is a permalink.'),
'#default_value' => $this->options['guid_field_options']['guid_field_is_permalink'],
];
}
public function validate() {
$errors = parent::validate();
$required_options = ['title_field', 'link_field', 'description_field', 'creator_field', 'date_field'];
foreach ($required_options as $required_option) {
if (empty($this->options[$required_option])) {
$errors[] = $this->t('Row style plugin requires specifying which views fields to use for RSS item.');
break;
}
}
// Once more for guid.
if (empty($this->options['guid_field_options']['guid_field'])) {
$errors[] = $this->t('Row style plugin requires specifying which views fields to use for RSS item.');
}
return $errors;
}
public function render($row) {
static $row_index;
if (!isset($row_index)) {
$row_index = 0;
}
if (function_exists('rdf_get_namespaces')) {
// Merge RDF namespaces in the XML namespaces in case they are used
// further in the RSS content.
$xml_rdf_namespaces = [];
foreach (rdf_get_namespaces() as $prefix => $uri) {
$xml_rdf_namespaces['xmlns:' . $prefix] = $uri;
}
$this->view->style_plugin->namespaces += $xml_rdf_namespaces;
}
// Create the RSS item object.
$item = new \stdClass();
$item->title = $this->getField($row_index, $this->options['title_field']);
// @todo Views should expect and store a leading /. See:
// https://www.drupal.org/node/2423913
$item->link = Url::fromUserInput('/' . $this->getField($row_index, $this->options['link_field']))->setAbsolute()->toString();
$field = $this->getField($row_index, $this->options['description_field']);
$item->description = is_array($field) ? $field : ['#markup' => $field];
$item->elements = [
['key' => 'pubDate', 'value' => $this->getField($row_index, $this->options['date_field'])],
[
'key' => 'dc:creator',
'value' => $this->getField($row_index, $this->options['creator_field']),
'namespace' => ['xmlns:dc' => 'http://purl.org/dc/elements/1.1/'],
],
];
$guid_is_permalink_string = 'false';
$item_guid = $this->getField($row_index, $this->options['guid_field_options']['guid_field']);
if ($this->options['guid_field_options']['guid_field_is_permalink']) {
$guid_is_permalink_string = 'true';
// @todo Enforce GUIDs as system-generated rather than user input? See
// https://www.drupal.org/node/2430589.
$item_guid = Url::fromUserInput('/' . $item_guid)->setAbsolute()->toString();
}
$item->elements[] = [
'key' => 'guid',
'value' => $item_guid,
'attributes' => ['isPermaLink' => $guid_is_permalink_string],
];
$row_index++;
foreach ($item->elements as $element) {
if (isset($element['namespace'])) {
$this->view->style_plugin->namespaces = array_merge($this->view->style_plugin->namespaces, $element['namespace']);
}
}
$build = [
'#theme' => $this->themeFunctions(),
'#view' => $this->view,
'#options' => $this->options,
'#row' => $item,
'#field_alias' => isset($this->field_alias) ? $this->field_alias : '',
];
return $build;
}
/**
* Retrieves a views field value from the style plugin.
*
* @param $index
* The index count of the row as expected by views_plugin_style::getField().
* @param $field_id
* The ID assigned to the required field in the display.
*
* @return string|null|\Drupal\Component\Render\MarkupInterface
* An empty string if there is no style plugin, or the field ID is empty.
* NULL if the field value is empty. If neither of these conditions apply,
* a MarkupInterface object containing the rendered field value.
*/
public function getField($index, $field_id) {
if (empty($this->view->style_plugin) || !is_object($this->view->style_plugin) || empty($field_id)) {
return '';
}
return $this->view->style_plugin->getField($index, $field_id);
}
}