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+<?php
+/**
+ * Widget API: WP_Widget_RSS class
+ *
+ * @package WordPress
+ * @subpackage Widgets
+ * @since 4.4.0
+ */
+
+/**
+ * Core class used to implement a RSS widget.
+ *
+ * @since 2.8.0
+ *
+ * @see WP_Widget
+ */
+class WP_Widget_RSS extends WP_Widget {
+
+ /**
+ * Sets up a new RSS widget instance.
+ *
+ * @since 2.8.0
+ */
+ public function __construct() {
+ $widget_ops = array(
+ 'description' => __( 'Entries from any RSS or Atom feed.' ),
+ 'customize_selective_refresh' => true,
+ 'show_instance_in_rest' => true,
+
+ );
+ $control_ops = array(
+ 'width' => 400,
+ 'height' => 200,
+ );
+ parent::__construct( 'rss', __( 'RSS' ), $widget_ops, $control_ops );
+ }
+
+ /**
+ * Outputs the content for the current RSS widget instance.
+ *
+ * @since 2.8.0
+ *
+ * @param array $args Display arguments including 'before_title', 'after_title',
+ * 'before_widget', and 'after_widget'.
+ * @param array $instance Settings for the current RSS widget instance.
+ */
+ public function widget( $args, $instance ) {
+ if ( isset( $instance['error'] ) && $instance['error'] ) {
+ return;
+ }
+
+ $url = ! empty( $instance['url'] ) ? $instance['url'] : '';
+ while ( ! empty( $url ) && stristr( $url, 'http' ) !== $url ) {
+ $url = substr( $url, 1 );
+ }
+
+ if ( empty( $url ) ) {
+ return;
+ }
+
+ // Self-URL destruction sequence.
+ if ( in_array( untrailingslashit( $url ), array( site_url(), home_url() ), true ) ) {
+ return;
+ }
+
+ $rss = fetch_feed( $url );
+ $title = $instance['title'];
+ $desc = '';
+ $link = '';
+
+ if ( ! is_wp_error( $rss ) ) {
+ $desc = esc_attr( strip_tags( html_entity_decode( $rss->get_description(), ENT_QUOTES, get_option( 'blog_charset' ) ) ) );
+ if ( empty( $title ) ) {
+ $title = strip_tags( $rss->get_title() );
+ }
+ $link = strip_tags( $rss->get_permalink() );
+ while ( ! empty( $link ) && stristr( $link, 'http' ) !== $link ) {
+ $link = substr( $link, 1 );
+ }
+ }
+
+ if ( empty( $title ) ) {
+ $title = ! empty( $desc ) ? $desc : __( 'Unknown Feed' );
+ }
+
+ /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
+ $title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
+
+ if ( $title ) {
+ $feed_link = '';
+ $feed_url = strip_tags( $url );
+ $feed_icon = includes_url( 'images/rss.png' );
+ $feed_link = sprintf(
+ '<a class="rsswidget rss-widget-feed" href="%1$s"><img class="rss-widget-icon" style="border:0" width="14" height="14" src="%2$s" alt="%3$s"%4$s /></a> ',
+ esc_url( $feed_url ),
+ esc_url( $feed_icon ),
+ esc_attr__( 'RSS' ),
+ ( wp_lazy_loading_enabled( 'img', 'rss_widget_feed_icon' ) ? ' loading="lazy"' : '' )
+ );
+
+ /**
+ * Filters the classic RSS widget's feed icon link.
+ *
+ * Themes can remove the icon link by using `add_filter( 'rss_widget_feed_link', '__return_empty_string' );`.
+ *
+ * @since 5.9.0
+ *
+ * @param string|false $feed_link HTML for link to RSS feed.
+ * @param array $instance Array of settings for the current widget.
+ */
+ $feed_link = apply_filters( 'rss_widget_feed_link', $feed_link, $instance );
+
+ $title = $feed_link . '<a class="rsswidget rss-widget-title" href="' . esc_url( $link ) . '">' . esc_html( $title ) . '</a>';
+ }
+
+ echo $args['before_widget'];
+ if ( $title ) {
+ echo $args['before_title'] . $title . $args['after_title'];
+ }
+
+ $format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';
+
+ /** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */
+ $format = apply_filters( 'navigation_widgets_format', $format );
+
+ if ( 'html5' === $format ) {
+ // The title may be filtered: Strip out HTML and make sure the aria-label is never empty.
+ $title = trim( strip_tags( $title ) );
+ $aria_label = $title ? $title : __( 'RSS Feed' );
+ echo '<nav aria-label="' . esc_attr( $aria_label ) . '">';
+ }
+
+ wp_widget_rss_output( $rss, $instance );
+
+ if ( 'html5' === $format ) {
+ echo '</nav>';
+ }
+
+ echo $args['after_widget'];
+
+ if ( ! is_wp_error( $rss ) ) {
+ $rss->__destruct();
+ }
+ unset( $rss );
+ }
+
+ /**
+ * Handles updating settings for the current RSS widget instance.
+ *
+ * @since 2.8.0
+ *
+ * @param array $new_instance New settings for this instance as input by the user via
+ * WP_Widget::form().
+ * @param array $old_instance Old settings for this instance.
+ * @return array Updated settings to save.
+ */
+ public function update( $new_instance, $old_instance ) {
+ $testurl = ( isset( $new_instance['url'] ) && ( ! isset( $old_instance['url'] ) || ( $new_instance['url'] !== $old_instance['url'] ) ) );
+ return wp_widget_rss_process( $new_instance, $testurl );
+ }
+
+ /**
+ * Outputs the settings form for the RSS widget.
+ *
+ * @since 2.8.0
+ *
+ * @param array $instance Current settings.
+ */
+ public function form( $instance ) {
+ if ( empty( $instance ) ) {
+ $instance = array(
+ 'title' => '',
+ 'url' => '',
+ 'items' => 10,
+ 'error' => false,
+ 'show_summary' => 0,
+ 'show_author' => 0,
+ 'show_date' => 0,
+ );
+ }
+ $instance['number'] = $this->number;
+
+ wp_widget_rss_form( $instance );
+ }
+}