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<?php
/**
* Server-side rendering of the `core/rss` block.
*
* @package WordPress
*/
/**
* Renders the `core/rss` block on server.
*
* @param array $attributes The block attributes.
*
* @return string Returns the block content with received rss items.
*/
function render_block_core_rss( $attributes ) {
$rss = fetch_feed( $attributes['feedURL'] );
if ( is_wp_error( $rss ) ) {
return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . $rss->get_error_message() . '</div></div>';
}
if ( ! $rss->get_item_quantity() ) {
// PHP 5.2 compatibility. See: http://simplepie.org/wiki/faq/i_m_getting_memory_leaks.
$rss->__destruct();
unset( $rss );
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>';
}
$rss_items = $rss->get_items( 0, $attributes['itemsToShow'] );
$list_items = '';
foreach ( $rss_items as $item ) {
$title = esc_html( trim( strip_tags( $item->get_title() ) ) );
if ( empty( $title ) ) {
$title = __( '(Untitled)' );
}
$link = $item->get_link();
$link = esc_url( $link );
if ( $link ) {
$title = "<a href='{$link}'>{$title}</a>";
}
$title = "<div class='wp-block-rss__item-title'>{$title}</div>";
$date = '';
if ( $attributes['displayDate'] ) {
$date = $item->get_date( 'U' );
if ( $date ) {
$date = sprintf(
'<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',
date_i18n( get_option( 'c' ), $date ),
date_i18n( get_option( 'date_format' ), $date )
);
}
}
$author = '';
if ( $attributes['displayAuthor'] ) {
$author = $item->get_author();
if ( is_object( $author ) ) {
$author = $author->get_name();
$author = '<span class="wp-block-rss__item-author">' . __( 'by' ) . ' ' . esc_html( strip_tags( $author ) ) . '</span>';
}
}
$excerpt = '';
if ( $attributes['displayExcerpt'] ) {
$excerpt = html_entity_decode( $item->get_description(), ENT_QUOTES, get_option( 'blog_charset' ) );
$excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' […]' ) );
// Change existing [...] to […].
if ( '[...]' == substr( $excerpt, -5 ) ) {
$excerpt = substr( $excerpt, 0, -5 ) . '[…]';
}
$excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';
}
$list_items .= "<li class='wp-block-rss__item'>{$title}{$date}{$author}{$excerpt}</li>";
}
$classes = 'grid' === $attributes['blockLayout'] ? ' is-grid columns-' . $attributes['columns'] : '';
$list_items_markup = sprintf( "<ul class='%s'>%s</ul>", esc_attr( $class ), $list_items );
// PHP 5.2 compatibility. See: http://simplepie.org/wiki/faq/i_m_getting_memory_leaks.
$rss->__destruct();
unset( $rss );
return $list_items_markup;
}
/**
* Registers the `core/rss` block on server.
*/
function register_block_core_rss() {
register_block_type( 'core/rss',
array(
'attributes' => array(
'columns' => array(
'type' => 'number',
'default' => 2,
),
'blockLayout' => array(
'type' => 'string',
'default' => 'list',
),
'feedURL' => array(
'type' => 'string',
'default' => '',
),
'itemsToShow' => array(
'type' => 'number',
'default' => 5,
),
'displayExcerpt' => array(
'type' => 'boolean',
'default' => false,
),
'displayAuthor' => array(
'type' => 'boolean',
'default' => false,
),
'displayDate' => array(
'type' => 'boolean',
'default' => false,
),
'excerptLength' => array(
'type' => 'number',
'default' => 55,
),
),
'render_callback' => 'render_block_core_rss',
)
);
}
add_action( 'init', 'register_block_core_rss' );