<?php

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/**

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* Server-side rendering of the `core/rss` block.

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*

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* @package WordPress

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*/

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/**

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* Renders the `core/rss` block on server.

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*

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* @param array $attributes The block attributes.

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*

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* @return string Returns the block content with received rss items.

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*/

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function render_block_core_rss( $attributes ) {

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$rss = fetch_feed( $attributes['feedURL'] );

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if ( is_wp_error( $rss ) ) {

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return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . esc_html( $rss->get_error_message() ) . '</div></div>';

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}

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if ( ! $rss->get_item_quantity() ) {

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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>';

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}

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$rss_items = $rss->get_items( 0, $attributes['itemsToShow'] );

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$list_items = '';

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foreach ( $rss_items as $item ) {

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$title = esc_html( trim( strip_tags( $item->get_title() ) ) );

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if ( empty( $title ) ) {

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$title = __( '(no title)' );

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}

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$link = $item->get_link();

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$link = esc_url( $link );

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if ( $link ) {

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$title = "<a href='{$link}'>{$title}</a>";

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}

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$title = "<div class='wp-block-rss__item-title'>{$title}</div>";

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$date = '';

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if ( $attributes['displayDate'] ) {

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$date = $item->get_date( 'U' );

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if ( $date ) {

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$date = sprintf(

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'<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',

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esc_attr( date_i18n( get_option( 'c' ), $date ) ),

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esc_attr( date_i18n( get_option( 'date_format' ), $date ) )

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);

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}

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}

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$author = '';

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if ( $attributes['displayAuthor'] ) {

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$author = $item->get_author();

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if ( is_object( $author ) ) {

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$author = $author->get_name();

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$author = '<span class="wp-block-rss__item-author">' . sprintf(

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/* translators: %s: the author. */

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__( 'by %s' ),

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esc_html( strip_tags( $author ) )

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) . '</span>';

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}

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}

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$excerpt = '';

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if ( $attributes['displayExcerpt'] ) {

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$excerpt = html_entity_decode( $item->get_description(), ENT_QUOTES, get_option( 'blog_charset' ) );

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$excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' [&hellip;]' ) );

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// Change existing [...] to [&hellip;].

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if ( '[...]' === substr( $excerpt, -5 ) ) {

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$excerpt = substr( $excerpt, 0, -5 ) . '[&hellip;]';

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}

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$excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';

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}

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$list_items .= "<li class='wp-block-rss__item'>{$title}{$date}{$author}{$excerpt}</li>";

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}

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$classnames = array();

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if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {

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$classnames[] = 'is-grid';

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}

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if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {

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$classnames[] = 'columns-' . $attributes['columns'];

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}

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$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );

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return sprintf( '<ul %s>%s</ul>', $wrapper_attributes, $list_items );

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}

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/**

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* Registers the `core/rss` block on server.

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*/

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function register_block_core_rss() {

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register_block_type_from_metadata(

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__DIR__ . '/rss',

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array(

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'render_callback' => 'render_block_core_rss',

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)

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);

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}

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add_action( 'init', 'register_block_core_rss' );

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