1<?php
2/**
3 * Widget API: WP_Widget_RSS class
4 *
5 * @package WordPress
6 * @subpackage Widgets
7 * @since 4.4.0
8 */
9
10/**
11 * Core class used to implement a RSS widget.
12 *
13 * @since 2.8.0
14 *
15 * @see WP_Widget
16 */
17class WP_Widget_RSS extends WP_Widget {
18
19 /**
20 * Sets up a new RSS widget instance.
21 *
22 * @since 2.8.0
23 */
24 public function __construct() {
25 $widget_ops = array(
26 'description' => __( 'Entries from any RSS or Atom feed.' ),
27 'customize_selective_refresh' => true,
28 'show_instance_in_rest' => true,
29
30 );
31 $control_ops = array(
32 'width' => 400,
33 'height' => 200,
34 );
35 parent::__construct( 'rss', __( 'RSS' ), $widget_ops, $control_ops );
36 }
37
38 /**
39 * Outputs the content for the current RSS widget instance.
40 *
41 * @since 2.8.0
42 *
43 * @param array $args Display arguments including 'before_title', 'after_title',
44 * 'before_widget', and 'after_widget'.
45 * @param array $instance Settings for the current RSS widget instance.
46 */
47 public function widget( $args, $instance ) {
48 if ( isset( $instance['error'] ) && $instance['error'] ) {
49 return;
50 }
51
52 $url = ! empty( $instance['url'] ) ? $instance['url'] : '';
53 while ( ! empty( $url ) && stristr( $url, 'http' ) !== $url ) {
54 $url = substr( $url, 1 );
55 }
56
57 if ( empty( $url ) ) {
58 return;
59 }
60
61 // Self-URL destruction sequence.
62 if ( in_array( untrailingslashit( $url ), array( site_url(), home_url() ), true ) ) {
63 return;
64 }
65
66 $rss = fetch_feed( $url );
67 $title = $instance['title'];
68 $desc = '';
69 $link = '';
70
71 if ( ! is_wp_error( $rss ) ) {
72 $desc = esc_attr( strip_tags( html_entity_decode( $rss->get_description(), ENT_QUOTES, get_option( 'blog_charset' ) ) ) );
73 if ( empty( $title ) ) {
74 $title = strip_tags( $rss->get_title() );
75 }
76 $link = strip_tags( $rss->get_permalink() );
77 while ( ! empty( $link ) && stristr( $link, 'http' ) !== $link ) {
78 $link = substr( $link, 1 );
79 }
80 }
81
82 if ( empty( $title ) ) {
83 $title = ! empty( $desc ) ? $desc : __( 'Unknown Feed' );
84 }
85
86 /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
87 $title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
88
89 if ( $title ) {
90 $feed_link = '';
91 $feed_url = strip_tags( $url );
92 $feed_icon = includes_url( 'images/rss.png' );
93 $feed_link = sprintf(
94 '<a class="rsswidget rss-widget-feed" href="%1$s"><img class="rss-widget-icon" style="border:0" width="14" height="14" src="%2$s" alt="%3$s"%4$s /></a> ',
95 esc_url( $feed_url ),
96 esc_url( $feed_icon ),
97 esc_attr__( 'RSS' ),
98 ( wp_lazy_loading_enabled( 'img', 'rss_widget_feed_icon' ) ? ' loading="lazy"' : '' )
99 );
100
101 /**
102 * Filters the classic RSS widget's feed icon link.
103 *
104 * Themes can remove the icon link by using `add_filter( 'rss_widget_feed_link', '__return_empty_string' );`.
105 *
106 * @since 5.9.0
107 *
108 * @param string|false $feed_link HTML for link to RSS feed.
109 * @param array $instance Array of settings for the current widget.
110 */
111 $feed_link = apply_filters( 'rss_widget_feed_link', $feed_link, $instance );
112
113 $title = $feed_link . '<a class="rsswidget rss-widget-title" href="' . esc_url( $link ) . '">' . esc_html( $title ) . '</a>';
114 }
115
116 echo $args['before_widget'];
117 if ( $title ) {
118 echo $args['before_title'] . $title . $args['after_title'];
119 }
120
121 $format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';
122
123 /** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */
124 $format = apply_filters( 'navigation_widgets_format', $format );
125
126 if ( 'html5' === $format ) {
127 // The title may be filtered: Strip out HTML and make sure the aria-label is never empty.
128 $title = trim( strip_tags( $title ) );
129 $aria_label = $title ? $title : __( 'RSS Feed' );
130 echo '<nav aria-label="' . esc_attr( $aria_label ) . '">';
131 }
132
133 wp_widget_rss_output( $rss, $instance );
134
135 if ( 'html5' === $format ) {
136 echo '</nav>';
137 }
138
139 echo $args['after_widget'];
140
141 if ( ! is_wp_error( $rss ) ) {
142 $rss->__destruct();
143 }
144 unset( $rss );
145 }
146
147 /**
148 * Handles updating settings for the current RSS widget instance.
149 *
150 * @since 2.8.0
151 *
152 * @param array $new_instance New settings for this instance as input by the user via
153 * WP_Widget::form().
154 * @param array $old_instance Old settings for this instance.
155 * @return array Updated settings to save.
156 */
157 public function update( $new_instance, $old_instance ) {
158 $testurl = ( isset( $new_instance['url'] ) && ( ! isset( $old_instance['url'] ) || ( $new_instance['url'] !== $old_instance['url'] ) ) );
159 return wp_widget_rss_process( $new_instance, $testurl );
160 }
161
162 /**
163 * Outputs the settings form for the RSS widget.
164 *
165 * @since 2.8.0
166 *
167 * @param array $instance Current settings.
168 */
169 public function form( $instance ) {
170 if ( empty( $instance ) ) {
171 $instance = array(
172 'title' => '',
173 'url' => '',
174 'items' => 10,
175 'error' => false,
176 'show_summary' => 0,
177 'show_author' => 0,
178 'show_date' => 0,
179 );
180 }
181 $instance['number'] = $this->number;
182
183 wp_widget_rss_form( $instance );
184 }
185}
186