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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/rss` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/rss` block on server.
  10   *
  11   * @since 5.2.0
  12   *
  13   * @param array $attributes The block attributes.
  14   *
  15   * @return string Returns the block content with received rss items.
  16   */
  17  function render_block_core_rss( $attributes ) {
  18      if ( in_array( untrailingslashit( $attributes['feedURL'] ), array( site_url(), home_url() ), true ) ) {
  19          return '<div class="components-placeholder"><div class="notice notice-error">' . __( 'Adding an RSS feed to this site’s homepage is not supported, as it could lead to a loop that slows down your site. Try using another block, like the <strong>Latest Posts</strong> block, to list posts from the site.' ) . '</div></div>';
  20      }
  21  
  22      $rss = fetch_feed( $attributes['feedURL'] );
  23  
  24      if ( is_wp_error( $rss ) ) {
  25          return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . esc_html( $rss->get_error_message() ) . '</div></div>';
  26      }
  27  
  28      if ( ! $rss->get_item_quantity() ) {
  29          return '<div class="components-placeholder"><div class="notice notice-error">' . __( 'An error has occurred, which probably means the feed is down. Try again later.' ) . '</div></div>';
  30      }
  31  
  32      $rss_items  = $rss->get_items( 0, $attributes['itemsToShow'] );
  33      $list_items = '';
  34      foreach ( $rss_items as $item ) {
  35          $title = esc_html( trim( strip_tags( $item->get_title() ) ) );
  36          if ( empty( $title ) ) {
  37              $title = __( '(no title)' );
  38          }
  39          $link = $item->get_link();
  40          $link = esc_url( $link );
  41          if ( $link ) {
  42              $title = "<a href='{$link}'>{$title}</a>";
  43          }
  44          $title = "<div class='wp-block-rss__item-title'>{$title}</div>";
  45  
  46          $date = '';
  47          if ( $attributes['displayDate'] ) {
  48              $date = $item->get_date( 'U' );
  49  
  50              if ( $date ) {
  51                  $date = sprintf(
  52                      '<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',
  53                      esc_attr( date_i18n( 'c', $date ) ),
  54                      esc_attr( date_i18n( get_option( 'date_format' ), $date ) )
  55                  );
  56              }
  57          }
  58  
  59          $author = '';
  60          if ( $attributes['displayAuthor'] ) {
  61              $author = $item->get_author();
  62              if ( is_object( $author ) ) {
  63                  $author = $author->get_name();
  64                  $author = '<span class="wp-block-rss__item-author">' . sprintf(
  65                      /* translators: byline. %s: author. */
  66                      __( 'by %s' ),
  67                      esc_html( strip_tags( $author ) )
  68                  ) . '</span>';
  69              }
  70          }
  71  
  72          $excerpt = '';
  73          if ( $attributes['displayExcerpt'] ) {
  74              $excerpt = html_entity_decode( $item->get_description(), ENT_QUOTES, get_option( 'blog_charset' ) );
  75              $excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' [&hellip;]' ) );
  76  
  77              // Change existing [...] to [&hellip;].
  78              if ( '[...]' === substr( $excerpt, -5 ) ) {
  79                  $excerpt = substr( $excerpt, 0, -5 ) . '[&hellip;]';
  80              }
  81  
  82              $excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';
  83          }
  84  
  85          $list_items .= "<li class='wp-block-rss__item'>{$title}{$date}{$author}{$excerpt}</li>";
  86      }
  87  
  88      $classnames = array();
  89      if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {
  90          $classnames[] = 'is-grid';
  91      }
  92      if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {
  93          $classnames[] = 'columns-' . $attributes['columns'];
  94      }
  95      if ( $attributes['displayDate'] ) {
  96          $classnames[] = 'has-dates';
  97      }
  98      if ( $attributes['displayAuthor'] ) {
  99          $classnames[] = 'has-authors';
 100      }
 101      if ( $attributes['displayExcerpt'] ) {
 102          $classnames[] = 'has-excerpts';
 103      }
 104  
 105      $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );
 106  
 107      return sprintf( '<ul %s>%s</ul>', $wrapper_attributes, $list_items );
 108  }
 109  
 110  /**
 111   * Registers the `core/rss` block on server.
 112   *
 113   * @since 5.2.0
 114   */
 115  function register_block_core_rss() {
 116      register_block_type_from_metadata(
 117          __DIR__ . '/rss',
 118          array(
 119              'render_callback' => 'render_block_core_rss',
 120          )
 121      );
 122  }
 123  add_action( 'init', 'register_block_core_rss' );