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<?php
/**
* Widget API: WP_Widget_Text class
*
* @package WordPress
* @subpackage Widgets
* @since 4.4.0
*/
/**
* Core class used to implement a Text widget.
*
* @since 2.8.0
*
* @see WP_Widget
*/
class WP_Widget_Text extends WP_Widget {
/**
* Whether or not the widget has been registered yet.
*
* @since 4.8.1
* @var bool
*/
protected $registered = false;
/**
* Sets up a new Text widget instance.
*
* @since 2.8.0
*/
public function __construct() {
$widget_ops = array(
'classname' => 'widget_text',
'description' => __( 'Arbitrary text.' ),
'customize_selective_refresh' => true,
);
$control_ops = array(
'width' => 400,
'height' => 350,
);
parent::__construct( 'text', __( 'Text' ), $widget_ops, $control_ops );
}
/**
* Add hooks for enqueueing assets when registering all widget instances of this widget class.
*
* @param integer $number Optional. The unique order number of this widget instance
* compared to other instances of the same class. Default -1.
*/
public function _register_one( $number = -1 ) {
parent::_register_one( $number );
if ( $this->registered ) {
return;
}
$this->registered = true;
wp_add_inline_script( 'text-widgets', sprintf( 'wp.textWidgets.idBases.push( %s );', wp_json_encode( $this->id_base ) ) );
if ( $this->is_preview() ) {
add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_preview_scripts' ) );
}
// Note that the widgets component in the customizer will also do the 'admin_print_scripts-widgets.php' action in WP_Customize_Widgets::print_scripts().
add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_scripts' ) );
// Note that the widgets component in the customizer will also do the 'admin_footer-widgets.php' action in WP_Customize_Widgets::print_footer_scripts().
add_action( 'admin_footer-widgets.php', array( 'WP_Widget_Text', 'render_control_template_scripts' ) );
}
/**
* Determines whether a given instance is legacy and should bypass using TinyMCE.
*
* @since 4.8.1
*
* @param array $instance {
* Instance data.
*
* @type string $text Content.
* @type bool|string $filter Whether autop or content filters should apply.
* @type bool $legacy Whether widget is in legacy mode.
* }
* @return bool Whether Text widget instance contains legacy data.
*/
public function is_legacy_instance( $instance ) {
// Legacy mode when not in visual mode.
if ( isset( $instance['visual'] ) ) {
return ! $instance['visual'];
}
// Or, the widget has been added/updated in 4.8.0 then filter prop is 'content' and it is no longer legacy.
if ( isset( $instance['filter'] ) && 'content' === $instance['filter'] ) {
return false;
}
// If the text is empty, then nothing is preventing migration to TinyMCE.
if ( empty( $instance['text'] ) ) {
return false;
}
$wpautop = ! empty( $instance['filter'] );
$has_line_breaks = ( false !== strpos( trim( $instance['text'] ), "\n" ) );
// If auto-paragraphs are not enabled and there are line breaks, then ensure legacy mode.
if ( ! $wpautop && $has_line_breaks ) {
return true;
}
// If an HTML comment is present, assume legacy mode.
if ( false !== strpos( $instance['text'], '<!--' ) ) {
return true;
}
// In the rare case that DOMDocument is not available we cannot reliably sniff content and so we assume legacy.
if ( ! class_exists( 'DOMDocument' ) ) {
// @codeCoverageIgnoreStart
return true;
// @codeCoverageIgnoreEnd
}
$doc = new DOMDocument();
// Suppress warnings generated by loadHTML
$errors = libxml_use_internal_errors( true );
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
@$doc->loadHTML(
sprintf(
'<!DOCTYPE html><html><head><meta charset="%s"></head><body>%s</body></html>',
esc_attr( get_bloginfo( 'charset' ) ),
$instance['text']
)
);
libxml_use_internal_errors( $errors );
$body = $doc->getElementsByTagName( 'body' )->item( 0 );
// See $allowedposttags.
$safe_elements_attributes = array(
'strong' => array(),
'em' => array(),
'b' => array(),
'i' => array(),
'u' => array(),
's' => array(),
'ul' => array(),
'ol' => array(),
'li' => array(),
'hr' => array(),
'abbr' => array(),
'acronym' => array(),
'code' => array(),
'dfn' => array(),
'a' => array(
'href' => true,
),
'img' => array(
'src' => true,
'alt' => true,
),
);
$safe_empty_elements = array( 'img', 'hr', 'iframe' );
foreach ( $body->getElementsByTagName( '*' ) as $element ) {
/** @var DOMElement $element */
$tag_name = strtolower( $element->nodeName );
// If the element is not safe, then the instance is legacy.
if ( ! isset( $safe_elements_attributes[ $tag_name ] ) ) {
return true;
}
// If the element is not safely empty and it has empty contents, then legacy mode.
if ( ! in_array( $tag_name, $safe_empty_elements, true ) && '' === trim( $element->textContent ) ) {
return true;
}
// If an attribute is not recognized as safe, then the instance is legacy.
foreach ( $element->attributes as $attribute ) {
/** @var DOMAttr $attribute */
$attribute_name = strtolower( $attribute->nodeName );
if ( ! isset( $safe_elements_attributes[ $tag_name ][ $attribute_name ] ) ) {
return true;
}
}
}
// Otherwise, the text contains no elements/attributes that TinyMCE could drop, and therefore the widget does not need legacy mode.
return false;
}
/**
* Filter gallery shortcode attributes.
*
* Prevents all of a site's attachments from being shown in a gallery displayed on a
* non-singular template where a $post context is not available.
*
* @since 4.9.0
*
* @param array $attrs Attributes.
* @return array Attributes.
*/
public function _filter_gallery_shortcode_attrs( $attrs ) {
if ( ! is_singular() && empty( $attrs['id'] ) && empty( $attrs['include'] ) ) {
$attrs['id'] = -1;
}
return $attrs;
}
/**
* Outputs the content for the current Text widget instance.
*
* @since 2.8.0
*
* @global WP_Post $post Global post object.
*
* @param array $args Display arguments including 'before_title', 'after_title',
* 'before_widget', and 'after_widget'.
* @param array $instance Settings for the current Text widget instance.
*/
public function widget( $args, $instance ) {
global $post;
$title = ! empty( $instance['title'] ) ? $instance['title'] : '';
/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
$text = ! empty( $instance['text'] ) ? $instance['text'] : '';
$is_visual_text_widget = ( ! empty( $instance['visual'] ) && ! empty( $instance['filter'] ) );
// In 4.8.0 only, visual Text widgets get filter=content, without visual prop; upgrade instance props just-in-time.
if ( ! $is_visual_text_widget ) {
$is_visual_text_widget = ( isset( $instance['filter'] ) && 'content' === $instance['filter'] );
}
if ( $is_visual_text_widget ) {
$instance['filter'] = true;
$instance['visual'] = true;
}
/*
* Suspend legacy plugin-supplied do_shortcode() for 'widget_text' filter for the visual Text widget to prevent
* shortcodes being processed twice. Now do_shortcode() is added to the 'widget_text_content' filter in core itself
* and it applies after wpautop() to prevent corrupting HTML output added by the shortcode. When do_shortcode() is
* added to 'widget_text_content' then do_shortcode() will be manually called when in legacy mode as well.
*/
$widget_text_do_shortcode_priority = has_filter( 'widget_text', 'do_shortcode' );
$should_suspend_legacy_shortcode_support = ( $is_visual_text_widget && false !== $widget_text_do_shortcode_priority );
if ( $should_suspend_legacy_shortcode_support ) {
remove_filter( 'widget_text', 'do_shortcode', $widget_text_do_shortcode_priority );
}
// Override global $post so filters (and shortcodes) apply in a consistent context.
$original_post = $post;
if ( is_singular() ) {
// Make sure post is always the queried object on singular queries (not from another sub-query that failed to clean up the global $post).
$post = get_queried_object();
} else {
// Nullify the $post global during widget rendering to prevent shortcodes from running with the unexpected context on archive queries.
$post = null;
}
// Prevent dumping out all attachments from the media library.
add_filter( 'shortcode_atts_gallery', array( $this, '_filter_gallery_shortcode_attrs' ) );
/**
* Filters the content of the Text widget.
*
* @since 2.3.0
* @since 4.4.0 Added the `$this` parameter.
* @since 4.8.1 The `$this` param may now be a `WP_Widget_Custom_HTML` object in addition to a `WP_Widget_Text` object.
*
* @param string $text The widget content.
* @param array $instance Array of settings for the current widget.
* @param WP_Widget_Text|WP_Widget_Custom_HTML $this Current Text widget instance.
*/
$text = apply_filters( 'widget_text', $text, $instance, $this );
if ( $is_visual_text_widget ) {
/**
* Filters the content of the Text widget to apply changes expected from the visual (TinyMCE) editor.
*
* By default a subset of the_content filters are applied, including wpautop and wptexturize.
*
* @since 4.8.0
*
* @param string $text The widget content.
* @param array $instance Array of settings for the current widget.
* @param WP_Widget_Text $this Current Text widget instance.
*/
$text = apply_filters( 'widget_text_content', $text, $instance, $this );
} else {
// Now in legacy mode, add paragraphs and line breaks when checkbox is checked.
if ( ! empty( $instance['filter'] ) ) {
$text = wpautop( $text );
}
/*
* Manually do shortcodes on the content when the core-added filter is present. It is added by default
* in core by adding do_shortcode() to the 'widget_text_content' filter to apply after wpautop().
* Since the legacy Text widget runs wpautop() after 'widget_text' filters are applied, the widget in
* legacy mode here manually applies do_shortcode() on the content unless the default
* core filter for 'widget_text_content' has been removed, or if do_shortcode() has already
* been applied via a plugin adding do_shortcode() to 'widget_text' filters.
*/
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