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 */
 17function 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
 35	$open_in_new_tab = ! empty( $attributes['openInNewTab'] );
 36	$rel             = ! empty( $attributes['rel'] ) ? trim( $attributes['rel'] ) : '';
 37
 38	$link_attributes = '';
 39
 40	if ( $open_in_new_tab ) {
 41		$link_attributes .= ' target="_blank"';
 42	}
 43
 44	if ( '' !== $rel ) {
 45		$link_attributes .= ' rel="' . esc_attr( $rel ) . '"';
 46	}
 47
 48	foreach ( $rss_items as $item ) {
 49		$title = esc_html( trim( strip_tags( html_entity_decode( $item->get_title() ) ) ) );
 50
 51		if ( empty( $title ) ) {
 52			$title = __( '(no title)' );
 53		}
 54		$link = $item->get_link();
 55		$link = esc_url( $link );
 56
 57		if ( $link ) {
 58			$title = "<a href='{$link}'{$link_attributes}>{$title}</a>";
 59		}
 60		$title = "<div class='wp-block-rss__item-title'>{$title}</div>";
 61
 62		$date_markup = '';
 63		if ( ! empty( $attributes['displayDate'] ) ) {
 64			$timestamp = $item->get_date( 'U' );
 65
 66			if ( $timestamp ) {
 67				$gmt_offset = get_option( 'gmt_offset' );
 68				$timestamp += (int) ( (float) $gmt_offset * HOUR_IN_SECONDS );
 69
 70				$date_markup = sprintf(
 71					'<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',
 72					esc_attr( date_i18n( 'c', $timestamp ) ),
 73					esc_html( date_i18n( get_option( 'date_format' ), $timestamp ) )
 74				);
 75			}
 76		}
 77
 78		$author = '';
 79		if ( $attributes['displayAuthor'] ) {
 80			$author = $item->get_author();
 81			if ( is_object( $author ) ) {
 82				$author = $author->get_name();
 83				if ( ! empty( $author ) ) {
 84					$author = '<span class="wp-block-rss__item-author">' . sprintf(
 85						/* translators: byline. %s: author. */
 86						__( 'by %s' ),
 87						esc_html( strip_tags( $author ) )
 88					) . '</span>';
 89				}
 90			}
 91		}
 92
 93		$excerpt     = '';
 94		$description = $item->get_description();
 95		if ( $attributes['displayExcerpt'] && ! empty( $description ) ) {
 96			$excerpt = html_entity_decode( $description, ENT_QUOTES, get_option( 'blog_charset' ) );
 97			$excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' [&hellip;]' ) );
 98
 99			// Change existing [...] to [&hellip;].
100			if ( '[...]' === substr( $excerpt, -5 ) ) {
101				$excerpt = substr( $excerpt, 0, -5 ) . '[&hellip;]';
102			}
103
104			$excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';
105		}
106
107		$list_items .= "<li class='wp-block-rss__item'>{$title}{$date_markup}{$author}{$excerpt}</li>";
108	}
109
110	$classnames = array();
111	if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {
112		$classnames[] = 'is-grid';
113	}
114	if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {
115		$classnames[] = 'columns-' . $attributes['columns'];
116	}
117	if ( $attributes['displayDate'] ) {
118		$classnames[] = 'has-dates';
119	}
120	if ( $attributes['displayAuthor'] ) {
121		$classnames[] = 'has-authors';
122	}
123	if ( $attributes['displayExcerpt'] ) {
124		$classnames[] = 'has-excerpts';
125	}
126
127	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );
128
129	return sprintf( '<ul %s>%s</ul>', $wrapper_attributes, $list_items );
130}
131
132/**
133 * Registers the `core/rss` block on server.
134 *
135 * @since 5.2.0
136 */
137function register_block_core_rss() {
138	register_block_type_from_metadata(
139		__DIR__ . '/rss',
140		array(
141			'render_callback' => 'render_block_core_rss',
142		)
143	);
144}
145add_action( 'init', 'register_block_core_rss' );
146