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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   * @param array $attributes The block attributes.
  12   *
  13   * @return string Returns the block content with received rss items.
  14   */
  15  function render_block_core_rss( $attributes ) {
  16      if ( in_array( untrailingslashit( $attributes['feedURL'] ), array( site_url(), home_url() ), true ) ) {
  17          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>';
  18      }
  19  
  20      $rss = fetch_feed( $attributes['feedURL'] );
  21  
  22      if ( is_wp_error( $rss ) ) {
  23          return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . $rss->get_error_message() . '</div></div>';
  24      }
  25  
  26      if ( ! $rss->get_item_quantity() ) {
  27          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>';
  28      }
  29  
  30      $rss_items  = $rss->get_items( 0, $attributes['itemsToShow'] );
  31      $list_items = '';
  32      foreach ( $rss_items as $item ) {
  33          $title = esc_html( trim( strip_tags( $item->get_title() ) ) );
  34          if ( empty( $title ) ) {
  35              $title = __( '(no title)' );
  36          }
  37          $link = $item->get_link();
  38          $link = esc_url( $link );
  39          if ( $link ) {
  40              $title = "<a href='{$link}'>{$title}</a>";
  41          }
  42          $title = "<div class='wp-block-rss__item-title'>{$title}</div>";
  43  
  44          $date = '';
  45          if ( $attributes['displayDate'] ) {
  46              $date = $item->get_date( 'U' );
  47  
  48              if ( $date ) {
  49                  $date = sprintf(
  50                      '<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',
  51                      date_i18n( get_option( 'c' ), $date ),
  52                      date_i18n( get_option( 'date_format' ), $date )
  53                  );
  54              }
  55          }
  56  
  57          $author = '';
  58          if ( $attributes['displayAuthor'] ) {
  59              $author = $item->get_author();
  60              if ( is_object( $author ) ) {
  61                  $author = $author->get_name();
  62                  $author = '<span class="wp-block-rss__item-author">' . sprintf(
  63                      /* translators: %s: the author. */
  64                      __( 'by %s' ),
  65                      esc_html( strip_tags( $author ) )
  66                  ) . '</span>';
  67              }
  68          }
  69  
  70          $excerpt = '';
  71          if ( $attributes['displayExcerpt'] ) {
  72              $excerpt = html_entity_decode( $item->get_description(), ENT_QUOTES, get_option( 'blog_charset' ) );
  73              $excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' [&hellip;]' ) );
  74  
  75              // Change existing [...] to [&hellip;].
  76              if ( '[...]' === substr( $excerpt, -5 ) ) {
  77                  $excerpt = substr( $excerpt, 0, -5 ) . '[&hellip;]';
  78              }
  79  
  80              $excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';
  81          }
  82  
  83          $list_items .= "<li class='wp-block-rss__item'>{$title}{$date}{$author}{$excerpt}</li>";
  84      }
  85  
  86      $classnames = array();
  87      if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {
  88          $classnames[] = 'is-grid';
  89      }
  90      if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {
  91          $classnames[] = 'columns-' . $attributes['columns'];
  92      }
  93      if ( $attributes['displayDate'] ) {
  94          $classnames[] = 'has-dates';
  95      }
  96      if ( $attributes['displayAuthor'] ) {
  97          $classnames[] = 'has-authors';
  98      }
  99      if ( $attributes['displayExcerpt'] ) {
 100          $classnames[] = 'has-excerpts';
 101      }
 102  
 103      $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );
 104  
 105      return sprintf( '<ul %s>%s</ul>', $wrapper_attributes, $list_items );
 106  }
 107  
 108  /**
 109   * Registers the `core/rss` block on server.
 110   */
 111  function register_block_core_rss() {
 112      register_block_type_from_metadata(
 113          __DIR__ . '/rss',
 114          array(
 115              'render_callback' => 'render_block_core_rss',
 116          )
 117      );
 118  }
 119  add_action( 'init', 'register_block_core_rss' );