<?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 );
    }
}