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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
		$errors = libxml_use_internal_errors( true );
		@$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
	 *
	 * @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.
			 */
			if ( has_filter( 'widget_text_content', 'do_shortcode' ) && ! $widget_text_do_shortcode_priority ) {
				if ( ! empty( $instance['filter'] ) ) {
					$text = shortcode_unautop( $text );
				}
				$text = do_shortcode( $text );
			}
		}

// Restore post global.
		$post = $original_post;
		remove_filter( 'shortcode_atts_gallery', array( $this, '_filter_gallery_shortcode_attrs' ) );

// Undo suspension of legacy plugin-supplied shortcode handling.
		if ( $should_suspend_legacy_shortcode_support ) {
			add_filter( 'widget_text', 'do_shortcode', $widget_text_do_shortcode_priority );
		}

echo $args['before_widget'];
		if ( ! empty( $title ) ) {
			echo $args['before_title'] . $title . $args['after_title'];
		}

$text = preg_replace_callback( '#<(video|iframe|object|embed)\s[^>]*>#i', array( $this, 'inject_video_max_width_style' ), $text );

// Adds noreferrer and noopener relationships, without duplicating values, to all HTML A elements that have a target.
		$text = wp_targeted_link_rel( $text );

?>
			<div class="textwidget"><?php echo $text; ?></div>
		<?php
		echo $args['after_widget'];
	}

/**
	 * Inject max-width and remove height for videos too constrained to fit inside sidebars on frontend.
	 *
	 * @since 4.9.0
	 *
	 * @see WP_Widget_Media_Video::inject_video_max_width_style()
	 * @param array $matches Pattern matches from preg_replace_callback.
	 * @return string HTML Output.
	 */
	public function inject_video_max_width_style( $matches ) {
		$html = $matches[0];
		$html = preg_replace( '/\sheight="\d+"/', '', $html );
		$html = preg_replace( '/\swidth="\d+"/', '', $html );
		$html = preg_replace( '/(?<=width:)\s*\d+px(?=;?)/', '100%', $html );
		return $html;
	}

/**
	 * Handles updating settings for the current Text 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 Settings to save or bool false to cancel saving.
	 */
	public function update( $new_instance, $old_instance ) {
		$new_instance = wp_parse_args(
			$new_instance,
			array(
				'title'  => '',
				'text'   => '',
				'filter' => false, // For back-compat.
				'visual' => null, // Must be explicitly defined.
			)
		);

$instance = $old_instance;

$instance['title'] = sanitize_text_field( $new_instance['title'] );
		if ( current_user_can( 'unfiltered_html' ) ) {
			$instance['text'] = $new_instance['text'];
		} else {
			$instance['text'] = wp_kses_post( $new_instance['text'] );
		}

$instance['filter'] = ! empty( $new_instance['filter'] );

// Upgrade 4.8.0 format.
		if ( isset( $old_instance['filter'] ) && 'content' === $old_instance['filter'] ) {
			$instance['visual'] = true;
		}
		if ( 'content' === $new_instance['filter'] ) {
			$instance['visual'] = true;
		}

if ( isset( $new_instance['visual'] ) ) {
			$instance['visual'] = ! empty( $new_instance['visual'] );
		}

// Filter is always true in visual mode.
		if ( ! empty( $instance['visual'] ) ) {
			$instance['filter'] = true;
		}

return $instance;
	}

/**
	 * Enqueue preview scripts.
	 *
	 * These scripts normally are enqueued just-in-time when a playlist shortcode is used.
	 * However, in the customizer, a playlist shortcode may be used in a text widget and
	 * dynamically added via selective refresh, so it is important to unconditionally enqueue them.
	 *
	 * @since 4.9.3
	 */
	public function enqueue_preview_scripts() {
		require_once dirname( dirname( __FILE__ ) ) . '/media.php';

wp_playlist_scripts( 'audio' );
		wp_playlist_scripts( 'video' );
	}

/**
	 * Loads the required scripts and styles for the widget control.
	 *
	 * @since 4.8.0
	 */
	public function enqueue_admin_scripts() {
		wp_enqueue_editor();
		wp_enqueue_media();
		wp_enqueue_script( 'text-widgets' );
		wp_add_inline_script( 'text-widgets', 'wp.textWidgets.init();', 'after' );
	}

/**
	 * Outputs the Text widget settings form.
	 *
	 * @since 2.8.0
	 * @since 4.8.0 Form only contains hidden inputs which are synced with JS template.
	 * @since 4.8.1 Restored original form to be displayed when in legacy mode.
	 * @see WP_Widget_Text::render_control_template_scripts()
	 * @see _WP_Editors::editor()
	 *
	 * @param array $instance Current settings.
	 * @return void
	 */
	public function form( $instance ) {
		$instance = wp_parse_args(
			(array) $instance,
			array(
				'title' => '',
				'text'  => '',
			)
		);
		?>
		<?php if ( ! $this->is_legacy_instance( $instance ) ) : ?>
			<?php

if ( user_can_richedit() ) {
				add_filter( 'the_editor_content', 'format_for_editor', 10, 2 );
				$default_editor = 'tinymce';
			} else {
				$default_editor = 'html';
			}

/** This filter is documented in wp-includes/class-wp-editor.php */
			$text = apply_filters( 'the_editor_content', $instance['text'], $default_editor );

// Reset filter addition.
			if ( user_can_richedit() ) {
				remove_filter( 'the_editor_content', 'format_for_editor' );
			}

// Prevent premature closing of textarea in case format_for_editor() didn't apply or the_editor_content filter did a wrong thing.
			$escaped_text = preg_replace( '#</textarea#i', '</textarea', $text );

?>
			<input id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" class="title sync-input" type="hidden" value="<?php echo esc_attr( $instance['title'] ); ?>">
			<textarea id="<?php echo $this->get_field_id( 'text' ); ?>" name="<?php echo $this->get_field_name( 'text' ); ?>" class="text sync-input" hidden><?php echo $escaped_text; ?></textarea>
			<input id="<?php echo $this->get_field_id( 'filter' ); ?>" name="<?php echo $this->get_field_name( 'filter' ); ?>" class="filter sync-input" type="hidden" value="on">
			<input id="<?php echo $this->get_field_id( 'visual' ); ?>" name="<?php echo $this->get_field_name( 'visual' ); ?>" class="visual sync-input" type="hidden" value="on">
		<?php else : ?>
			<input id="<?php echo $this->get_field_id( 'visual' ); ?>" name="<?php echo $this->get_field_name( 'visual' ); ?>" class="visual" type="hidden" value="">
			<p>
				<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
				<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance['title'] ); ?>"/>
			</p>
			<div class="notice inline notice-info notice-alt">
				<?php if ( ! isset( $instance['visual'] ) ) : ?>
					<p><?php _e( 'This widget may contain code that may work better in the “Custom HTML” widget. How about trying that widget instead?' ); ?></p>
				<?php else : ?>
					<p><?php _e( 'This widget may have contained code that may work better in the “Custom HTML” widget. If you haven’t yet, how about trying that widget instead?' ); ?></p>
				<?php endif; ?>
			</div>
			<p>
				<label for="<?php echo $this->get_field_id( 'text' ); ?>"><?php _e( 'Content:' ); ?></label>
				<textarea class="widefat" rows="16" cols="20" id="<?php echo $this->get_field_id( 'text' ); ?>" name="<?php echo $this->get_field_name( 'text' ); ?>"><?php echo esc_textarea( $instance['text'] ); ?></textarea>
			</p>
			<p>
				<input id="<?php echo $this->get_field_id( 'filter' ); ?>" name="<?php echo $this->get_field_name( 'filter' ); ?>" type="checkbox"<?php checked( ! empty( $instance['filter'] ) ); ?> /> <label for="<?php echo $this->get_field_id( 'filter' ); ?>"><?php _e( 'Automatically add paragraphs' ); ?></label>
			</p>
			<?php
		endif;
	}

/**
	 * Render form template scripts.
	 *
	 * @since 4.8.0
	 * @since 4.9.0 The method is now static.
	 */
	public static function render_control_template_scripts() {
		$dismissed_pointers = explode( ',', (string) get_user_meta( get_current_user_id(), 'dismissed_wp_pointers', true ) );
		?>
		<script type="text/html" id="tmpl-widget-text-control-fields">
			<# var elementIdPrefix = 'el' + String( Math.random() ).replace( /\D/g, '' ) + '_' #>
			<p>
				<label for="{{ elementIdPrefix }}title"><?php esc_html_e( 'Title:' ); ?></label>
				<input id="{{ elementIdPrefix }}title" type="text" class="widefat title">
			</p>

<?php if ( ! in_array( 'text_widget_custom_html', $dismissed_pointers, true ) ) : ?>
				<div hidden class="wp-pointer custom-html-widget-pointer wp-pointer-top">
					<div class="wp-pointer-content">
						<h3><?php _e( 'New Custom HTML Widget' ); ?></h3>
						<?php if ( is_customize_preview() ) : ?>
							<p><?php _e( 'Did you know there is a “Custom HTML” widget now? You can find it by pressing the “<a class="add-widget" href="#">Add a Widget</a>” button and searching for “HTML”. Check it out to add some custom code to your site!' ); ?></p>
						<?php else : ?>
							<p><?php _e( 'Did you know there is a “Custom HTML” widget now? You can find it by scanning the list of available widgets on this screen. Check it out to add some custom code to your site!' ); ?></p>
						<?php endif; ?>
						<div class="wp-pointer-buttons">
							<a class="close" href="#"><?php _e( 'Dismiss' ); ?></a>
						</div>
					</div>
					<div class="wp-pointer-arrow">
						<div class="wp-pointer-arrow-inner"></div>
					</div>
				</div>
			<?php endif; ?>

<?php if ( ! in_array( 'text_widget_paste_html', $dismissed_pointers, true ) ) : ?>
				<div hidden class="wp-pointer paste-html-pointer wp-pointer-top">
					<div class="wp-pointer-content">
						<h3><?php _e( 'Did you just paste HTML?' ); ?></h3>
						<p><?php _e( 'Hey there, looks like you just pasted HTML into the “Visual” tab of the Text widget. You may want to paste your code into the “Text” tab instead. Alternately, try out the new “Custom HTML” widget!' ); ?></p>
						<div class="wp-pointer-buttons">
							<a class="close" href="#"><?php _e( 'Dismiss' ); ?></a>
						</div>
					</div>
					<div class="wp-pointer-arrow">
						<div class="wp-pointer-arrow-inner"></div>
					</div>
				</div>
			<?php endif; ?>

<p>
				<label for="{{ elementIdPrefix }}text" class="screen-reader-text"><?php esc_html_e( 'Content:' ); ?></label>
				<textarea id="{{ elementIdPrefix }}text" class="widefat text wp-editor-area" style="height: 200px" rows="16" cols="20"></textarea>
			</p>
		</script>
		<?php
	}
}