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class-wp-widget-rss.php (4567B)

      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  */
     17 class 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 		$url  = strip_tags( $url );
     90 		$icon = includes_url( 'images/rss.png' );
     91 		if ( $title ) {
     92 			$title = '<a class="rsswidget" href="' . esc_url( $url ) . '"><img class="rss-widget-icon" style="border:0" width="14" height="14" src="' . esc_url( $icon ) . '" alt="RSS" /></a> <a class="rsswidget" href="' . esc_url( $link ) . '">' . esc_html( $title ) . '</a>';
     93 		}
     94 
     95 		echo $args['before_widget'];
     96 		if ( $title ) {
     97 			echo $args['before_title'] . $title . $args['after_title'];
     98 		}
     99 
    100 		$format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';
    101 
    102 		/** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */
    103 		$format = apply_filters( 'navigation_widgets_format', $format );
    104 
    105 		if ( 'html5' === $format ) {
    106 			// The title may be filtered: Strip out HTML and make sure the aria-label is never empty.
    107 			$title      = trim( strip_tags( $title ) );
    108 			$aria_label = $title ? $title : __( 'RSS Feed' );
    109 			echo '<nav role="navigation" aria-label="' . esc_attr( $aria_label ) . '">';
    110 		}
    111 
    112 		wp_widget_rss_output( $rss, $instance );
    113 
    114 		if ( 'html5' === $format ) {
    115 			echo '</nav>';
    116 		}
    117 
    118 		echo $args['after_widget'];
    119 
    120 		if ( ! is_wp_error( $rss ) ) {
    121 			$rss->__destruct();
    122 		}
    123 		unset( $rss );
    124 	}
    125 
    126 	/**
    127 	 * Handles updating settings for the current RSS widget instance.
    128 	 *
    129 	 * @since 2.8.0
    130 	 *
    131 	 * @param array $new_instance New settings for this instance as input by the user via
    132 	 *                            WP_Widget::form().
    133 	 * @param array $old_instance Old settings for this instance.
    134 	 * @return array Updated settings to save.
    135 	 */
    136 	public function update( $new_instance, $old_instance ) {
    137 		$testurl = ( isset( $new_instance['url'] ) && ( ! isset( $old_instance['url'] ) || ( $new_instance['url'] !== $old_instance['url'] ) ) );
    138 		return wp_widget_rss_process( $new_instance, $testurl );
    139 	}
    140 
    141 	/**
    142 	 * Outputs the settings form for the RSS widget.
    143 	 *
    144 	 * @since 2.8.0
    145 	 *
    146 	 * @param array $instance Current settings.
    147 	 */
    148 	public function form( $instance ) {
    149 		if ( empty( $instance ) ) {
    150 			$instance = array(
    151 				'title'        => '',
    152 				'url'          => '',
    153 				'items'        => 10,
    154 				'error'        => false,
    155 				'show_summary' => 0,
    156 				'show_author'  => 0,
    157 				'show_date'    => 0,
    158 			);
    159 		}
    160 		$instance['number'] = $this->number;
    161 
    162 		wp_widget_rss_form( $instance );
    163 	}
    164 }