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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      $feed_url = $attributes['feedURL'] ?? null;
  19      if ( ! is_string( $feed_url ) ) {
  20          return '';
  21      }
  22  
  23      if ( in_array( untrailingslashit( $feed_url ), array( site_url(), home_url() ), true ) ) {
  24          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>';
  25      }
  26  
  27      $rss = fetch_feed( $feed_url );
  28  
  29      if ( is_wp_error( $rss ) ) {
  30          return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . esc_html( $rss->get_error_message() ) . '</div></div>';
  31      }
  32  
  33      if ( ! $rss->get_item_quantity() ) {
  34          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>';
  35      }
  36  
  37      $rss_items  = $rss->get_items( 0, $attributes['itemsToShow'] );
  38      $list_items = '';
  39  
  40      $open_in_new_tab = ! empty( $attributes['openInNewTab'] );
  41      $rel_attr        = $attributes['rel'] ?? null;
  42      $rel             = is_string( $rel_attr ) && '' !== $rel_attr ? trim( $rel_attr ) : '';
  43  
  44      $link_attributes = '';
  45  
  46      if ( $open_in_new_tab ) {
  47          $link_attributes .= ' target="_blank"';
  48      }
  49  
  50      if ( '' !== $rel ) {
  51          $link_attributes .= ' rel="' . esc_attr( $rel ) . '"';
  52      }
  53  
  54      foreach ( $rss_items as $item ) {
  55          $title = esc_html( trim( strip_tags( html_entity_decode( $item->get_title() ) ) ) );
  56  
  57          if ( empty( $title ) ) {
  58              $title = __( '(no title)' );
  59          }
  60          $link = $item->get_link();
  61          $link = esc_url( $link );
  62  
  63          if ( $link ) {
  64              $title = "<a href='{$link}'{$link_attributes}>{$title}</a>";
  65          }
  66          $title = "<div class='wp-block-rss__item-title'>{$title}</div>";
  67  
  68          $date_markup = '';
  69          if ( ! empty( $attributes['displayDate'] ) ) {
  70              $timestamp = $item->get_date( 'U' );
  71  
  72              if ( $timestamp ) {
  73                  $gmt_offset = get_option( 'gmt_offset' );
  74                  $timestamp += (int) ( (float) $gmt_offset * HOUR_IN_SECONDS );
  75  
  76                  $date_markup = sprintf(
  77                      '<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',
  78                      esc_attr( date_i18n( 'c', $timestamp ) ),
  79                      esc_html( date_i18n( get_option( 'date_format' ), $timestamp ) )
  80                  );
  81              }
  82          }
  83  
  84          $author = '';
  85          if ( $attributes['displayAuthor'] ) {
  86              $author = $item->get_author();
  87              if ( is_object( $author ) ) {
  88                  $author = $author->get_name();
  89                  if ( ! empty( $author ) ) {
  90                      $author = '<span class="wp-block-rss__item-author">' . sprintf(
  91                          /* translators: byline. %s: author. */
  92                          __( 'by %s' ),
  93                          esc_html( strip_tags( $author ) )
  94                      ) . '</span>';
  95                  }
  96              }
  97          }
  98  
  99          $excerpt     = '';
 100          $description = $item->get_description();
 101          if ( $attributes['displayExcerpt'] && ! empty( $description ) ) {
 102              $excerpt = html_entity_decode( $description, ENT_QUOTES, get_option( 'blog_charset' ) );
 103              $excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' [&hellip;]' ) );
 104  
 105              // Change existing [...] to [&hellip;].
 106              if ( str_ends_with( $excerpt, '[...]' ) ) {
 107                  $excerpt = substr( $excerpt, 0, -5 ) . '[&hellip;]';
 108              }
 109  
 110              $excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';
 111          }
 112  
 113          $list_items .= "<li class='wp-block-rss__item'>{$title}{$date_markup}{$author}{$excerpt}</li>";
 114      }
 115  
 116      $classnames = array();
 117      if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {
 118          $classnames[] = 'is-grid';
 119      }
 120      if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {
 121          $classnames[] = 'columns-' . $attributes['columns'];
 122      }
 123      if ( $attributes['displayDate'] ) {
 124          $classnames[] = 'has-dates';
 125      }
 126      if ( $attributes['displayAuthor'] ) {
 127          $classnames[] = 'has-authors';
 128      }
 129      if ( $attributes['displayExcerpt'] ) {
 130          $classnames[] = 'has-excerpts';
 131      }
 132  
 133      $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );
 134  
 135      return sprintf( '<ul %s>%s</ul>', $wrapper_attributes, $list_items );
 136  }
 137  
 138  /**
 139   * Registers the `core/rss` block on server.
 140   *
 141   * @since 5.2.0
 142   */
 143  function register_block_core_rss() {
 144      register_block_type_from_metadata(
 145          __DIR__ . '/rss',
 146          array(
 147              'render_callback' => 'render_block_core_rss',
 148          )
 149      );
 150  }
 151  add_action( 'init', 'register_block_core_rss' );