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<title>[41044] branches/4.8: Widgets: Add Custom HTML widget.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/41044">41044</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/41044","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>westonruter</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-07-14 07:40:23 +0000 (Fri, 14 Jul 2017)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Widgets: Add Custom HTML widget.

Ports <a href="https://core.trac.wordpress.org/changeset/40893">[40893]</a>, <a href="https://core.trac.wordpress.org/changeset/40926">[40926]</a>, <a href="https://core.trac.wordpress.org/changeset/41000">[41000]</a> to the 4.8 branch.
Props westonruter, timmydcrawford, obenland.
Fixes <a href="https://core.trac.wordpress.org/ticket/40907">#40907</a> for 4.8.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches48srcwpincludesclasswpcustomizewidgetsphp">branches/4.8/src/wp-includes/class-wp-customize-widgets.php</a></li>
<li><a href="#branches48srcwpincludesdefaultfiltersphp">branches/4.8/src/wp-includes/default-filters.php</a></li>
<li><a href="#branches48srcwpincludesdefaultwidgetsphp">branches/4.8/src/wp-includes/default-widgets.php</a></li>
<li><a href="#branches48srcwpincludeswidgetsclasswpwidgettextphp">branches/4.8/src/wp-includes/widgets/class-wp-widget-text.php</a></li>
<li><a href="#branches48srcwpincludeswidgetsphp">branches/4.8/src/wp-includes/widgets.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#branches48testsphpunittestswidgetscustomhtmlwidgetphp">branches/4.8/tests/phpunit/tests/widgets/custom-html-widget.php</a></li>
</ul>

<h3>Property Changed</h3>
<ul>
<li><a href="#branches48">branches/4.8/</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/4.8
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/4.8 2017-07-14 05:46:19 UTC (rev 41043)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/4.8  2017-07-14 07:40:23 UTC (rev 41044)
</ins><a id="branches48"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/4.8</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.1:18031
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.3:20543
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:18512,40872-40873,40879,40881,40883,40885,40897,40901,41009,41022,41037
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:18512,40872-40873,40879,40881,40883,40885,40893,40897,40901,40926,41000,41009,41022,41037
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches48srcwpincludesclasswpcustomizewidgetsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/class-wp-customize-widgets.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/class-wp-customize-widgets.php       2017-07-14 05:46:19 UTC (rev 41043)
+++ branches/4.8/src/wp-includes/class-wp-customize-widgets.php 2017-07-14 07:40:23 UTC (rev 41044)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -35,9 +35,23 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @var array
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        protected $core_widget_id_bases = array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                'archives', 'calendar', 'categories', 'links', 'meta',
-               'nav_menu', 'pages', 'recent-comments', 'recent-posts',
-               'rss', 'search', 'tag_cloud', 'text',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         'archives',
+               'calendar',
+               'categories',
+               'custom_html',
+               'links',
+               'media_audio',
+               'media_image',
+               'media_video',
+               'meta',
+               'nav_menu',
+               'pages',
+               'recent-comments',
+               'recent-posts',
+               'rss',
+               'search',
+               'tag_cloud',
+               'text',
</ins><span class="cx" style="display: block; padding: 0 10px">         );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span></span></pre></div>
<a id="branches48srcwpincludesdefaultfiltersphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/default-filters.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/default-filters.php  2017-07-14 05:46:19 UTC (rev 41043)
+++ branches/4.8/src/wp-includes/default-filters.php    2017-07-14 07:40:23 UTC (rev 41044)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -170,6 +170,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> add_filter( 'widget_text_content', 'convert_smilies',  20 );
</span><span class="cx" style="display: block; padding: 0 10px"> add_filter( 'widget_text_content', 'wpautop'              );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+add_filter( 'widget_custom_html_content', 'balanceTags' );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> add_filter( 'date_i18n', 'wp_maybe_decline_date' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> // RSS filters
</span></span></pre></div>
<a id="branches48srcwpincludesdefaultwidgetsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/default-widgets.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/default-widgets.php  2017-07-14 05:46:19 UTC (rev 41043)
+++ branches/4.8/src/wp-includes/default-widgets.php    2017-07-14 07:40:23 UTC (rev 41044)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -60,3 +60,141 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /** WP_Nav_Menu_Widget class */
</span><span class="cx" style="display: block; padding: 0 10px"> require_once( ABSPATH . WPINC . '/widgets/class-wp-nav-menu-widget.php' );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+/**
+ * Core class used to implement a Custom HTML widget.
+ *
+ * Note that this class is only located in this file in the 4.8 branch
+ * for the sake of automatic updates. In 4.9 and above, it is located at
+ * `wp-includes/widgets/class-wp-widget-custom-html.php`.
+ *
+ * @since 4.8.1
+ *
+ * @see WP_Widget
+ */
+class WP_Widget_Custom_HTML extends WP_Widget {
+
+       /**
+        * Default instance.
+        *
+        * @since 4.8.1
+        * @var array
+        */
+       protected $default_instance = array(
+               'title' => '',
+               'content' => '',
+       );
+
+       /**
+        * Sets up a new Custom HTML widget instance.
+        *
+        * @since 4.8.1
+        */
+       public function __construct() {
+               $widget_ops = array(
+                       'classname' => 'widget_custom_html',
+                       'description' => __( 'Arbitrary HTML code.' ),
+                       'customize_selective_refresh' => true,
+               );
+               $control_ops = array(
+                       'width' => 400,
+                       'height' => 350,
+               );
+               parent::__construct( 'custom_html', __( 'Custom HTML' ), $widget_ops, $control_ops );
+       }
+
+       /**
+        * Outputs the content for the current Custom HTML widget instance.
+        *
+        * @since 4.8.1
+        *
+        * @param array $args     Display arguments including 'before_title', 'after_title',
+        *                        'before_widget', and 'after_widget'.
+        * @param array $instance Settings for the current Custom HTML widget instance.
+        */
+       public function widget( $args, $instance ) {
+
+               $instance = array_merge( $this->default_instance, $instance );
+
+               /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
+               $title = apply_filters( 'widget_title', $instance['title'], $instance, $this->id_base );
+
+               $content = $instance['content'];
+
+               /**
+                * Filters the content of the Custom HTML widget.
+                *
+                * @since 4.8.1
+                *
+                * @param string                $content  The widget content.
+                * @param array                 $instance Array of settings for the current widget.
+                * @param WP_Widget_Custom_HTML $this     Current Custom HTML widget instance.
+                */
+               $content = apply_filters( 'widget_custom_html_content', $content, $instance, $this );
+
+               echo $args['before_widget'];
+               if ( ! empty( $title ) ) {
+                       echo $args['before_title'] . $title . $args['after_title'];
+               }
+               echo $content;
+               echo $args['after_widget'];
+       }
+
+       /**
+        * Handles updating settings for the current Custom HTML widget instance.
+        *
+        * @since 4.8.1
+        *
+        * @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 ) {
+               $instance = array_merge( $this->default_instance, $old_instance );
+               $instance['title'] = sanitize_text_field( $new_instance['title'] );
+               if ( current_user_can( 'unfiltered_html' ) ) {
+                       $instance['content'] = $new_instance['content'];
+               } else {
+                       $instance['content'] = wp_kses_post( $new_instance['content'] );
+               }
+               return $instance;
+       }
+
+       /**
+        * Outputs the Custom HTML widget settings form.
+        *
+        * @since 4.8.1
+        *
+        * @param array $instance Current instance.
+        * @returns void
+        */
+       public function form( $instance ) {
+               $instance = wp_parse_args( (array) $instance, $this->default_instance );
+               ?>
+               <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>
+
+               <p>
+                       <label for="<?php echo $this->get_field_id( 'content' ); ?>"><?php _e( 'Content:' ); ?></label>
+                       <textarea class="widefat code" rows="16" cols="20" id="<?php echo $this->get_field_id( 'content' ); ?>" name="<?php echo $this->get_field_name( 'content' ); ?>"><?php echo esc_textarea( $instance['content'] ); ?></textarea>
+               </p>
+
+               <?php if ( ! current_user_can( 'unfiltered_html' ) ) : ?>
+                       <?php
+                       $probably_unsafe_html = array( 'script', 'iframe', 'form', 'input', 'style' );
+                       $allowed_html = wp_kses_allowed_html( 'post' );
+                       $disallowed_html = array_diff( $probably_unsafe_html, array_keys( $allowed_html ) );
+                       ?>
+                       <?php if ( ! empty( $disallowed_html ) ) : ?>
+                               <p>
+                                       <?php _e( 'Some HTML tags are not permitted, including:' ); ?>
+                                       <code><?php echo join( '</code>, <code>', $disallowed_html ); ?></code>
+                               </p>
+                       <?php endif; ?>
+               <?php endif; ?>
+               <?php
+       }
+}
</ins></span></pre></div>
<a id="branches48srcwpincludeswidgetsclasswpwidgettextphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/widgets/class-wp-widget-text.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/widgets/class-wp-widget-text.php     2017-07-14 05:46:19 UTC (rev 41043)
+++ branches/4.8/src/wp-includes/widgets/class-wp-widget-text.php       2017-07-14 07:40:23 UTC (rev 41044)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -25,7 +25,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">        public function __construct() {
</span><span class="cx" style="display: block; padding: 0 10px">                $widget_ops = array(
</span><span class="cx" style="display: block; padding: 0 10px">                        'classname' => 'widget_text',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        'description' => __( 'Arbitrary text or HTML.' ),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 'description' => __( 'Arbitrary text.' ),
</ins><span class="cx" style="display: block; padding: 0 10px">                         'customize_selective_refresh' => true,
</span><span class="cx" style="display: block; padding: 0 10px">                );
</span><span class="cx" style="display: block; padding: 0 10px">                $control_ops = array(
</span></span></pre></div>
<a id="branches48srcwpincludeswidgetsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/widgets.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/widgets.php  2017-07-14 05:46:19 UTC (rev 41043)
+++ branches/4.8/src/wp-includes/widgets.php    2017-07-14 07:40:23 UTC (rev 41044)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1474,6 +1474,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        register_widget( 'WP_Nav_Menu_Widget' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        register_widget( 'WP_Widget_Custom_HTML' );
+
</ins><span class="cx" style="display: block; padding: 0 10px">         /**
</span><span class="cx" style="display: block; padding: 0 10px">         * Fires after all default WordPress widgets have been registered.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span></span></pre></div>
<a id="branches48testsphpunittestswidgetscustomhtmlwidgetphpfromrev40926trunktestsphpunittestswidgetscustomhtmlwidgetphp"></a>
<div class="copfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Copied: branches/4.8/tests/phpunit/tests/widgets/custom-html-widget.php (from rev 40926, trunk/tests/phpunit/tests/widgets/custom-html-widget.php)</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/tests/phpunit/tests/widgets/custom-html-widget.php                           (rev 0)
+++ branches/4.8/tests/phpunit/tests/widgets/custom-html-widget.php     2017-07-14 07:40:23 UTC (rev 41044)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,165 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * Unit tests covering WP_Widget_Custom_HTML functionality.
+ *
+ * @package    WordPress
+ * @subpackage widgets
+ */
+
+/**
+ * Test wp-includes/widgets/class-wp-widget-custom-html.php
+ *
+ * @group widgets
+ */
+class Test_WP_Widget_Custom_HTML extends WP_UnitTestCase {
+
+       /**
+        * Args passed to the widget_custom_html_content filter.
+        *
+        * @var array
+        */
+       protected $widget_custom_html_content_args;
+
+       /**
+        * Test constructor.
+        *
+        * @covers WP_Widget_Custom_HTML::__constructor
+        */
+       function test_constructor() {
+               $widget = new WP_Widget_Custom_HTML();
+               $this->assertEquals( 'custom_html', $widget->id_base );
+               $this->assertEquals( 'widget_custom_html', $widget->widget_options['classname'] );
+               $this->assertTrue( $widget->widget_options['customize_selective_refresh'] );
+       }
+
+       /**
+        * Test widget method.
+        *
+        * @covers WP_Widget_Custom_HTML::widget
+        */
+       function test_widget() {
+               $widget = new WP_Widget_Custom_HTML();
+               $content = "<i>Custom HTML</i>\n\n<b>CODE</b>\nLast line.<u>unclosed";
+
+               $args = array(
+                       'before_title'  => '<h2>',
+                       'after_title'   => "</h2>\n",
+                       'before_widget' => '<section>',
+                       'after_widget'  => "</section>\n",
+               );
+               $instance = array(
+                       'title'   => 'Foo',
+                       'content' => $content,
+               );
+
+               $this->assertEquals( 10, has_filter( 'widget_custom_html_content', 'balanceTags' ) );
+
+               update_option( 'use_balanceTags', 0 );
+               add_filter( 'widget_custom_html_content', array( $this, 'filter_widget_custom_html_content' ), 5, 3 );
+               ob_start();
+               $this->widget_custom_html_content_args = null;
+               $widget->widget( $args, $instance );
+               $output = ob_get_clean();
+               $this->assertNotEmpty( $this->widget_custom_html_content_args );
+               $this->assertContains( '[filter:widget_custom_html_content]', $output );
+               $this->assertNotContains( '<p>', $output );
+               $this->assertNotContains( '<br>', $output );
+               $this->assertNotContains( '</u>', $output );
+               $this->assertEquals( $instance, $this->widget_custom_html_content_args[1] );
+               $this->assertSame( $widget, $this->widget_custom_html_content_args[2] );
+               remove_filter( 'widget_custom_html_content', array( $this, 'filter_widget_custom_html_content' ), 5, 3 );
+
+               update_option( 'use_balanceTags', 1 );
+               ob_start();
+               $widget->widget( $args, $instance );
+               $output = ob_get_clean();
+               $this->assertContains( '</u>', $output );
+       }
+
+       /**
+        * Filters the content of the Custom HTML widget.
+        *
+        * @param string                $widget_content The widget content.
+        * @param array                 $instance       Array of settings for the current widget.
+        * @param WP_Widget_Custom_HTML $widget         Current Custom HTML widget instance.
+        * @return string Widget content.
+        */
+       function filter_widget_custom_html_content( $widget_content, $instance, $widget ) {
+               $this->widget_custom_html_content_args = func_get_args();
+
+               $widget_content .= '[filter:widget_custom_html_content]';
+               return $widget_content;
+       }
+
+       /**
+        * Test update method.
+        *
+        * @covers WP_Widget_Custom_HTML::update
+        */
+       function test_update() {
+               $widget = new WP_Widget_Custom_HTML();
+               $instance = array(
+                       'title'   => "The\n<b>Title</b>",
+                       'content' => "The\n\n<b>Code</b>",
+               );
+
+               wp_set_current_user( $this->factory()->user->create( array(
+                       'role' => 'administrator',
+               ) ) );
+
+               // Should return valid instance.
+               $expected = array(
+                       'title'   => sanitize_text_field( $instance['title'] ),
+                       'content' => $instance['content'],
+               );
+               $result = $widget->update( $instance, array() );
+               $this->assertEquals( $result, $expected );
+
+               // Make sure KSES is applying as expected.
+               add_filter( 'map_meta_cap', array( $this, 'grant_unfiltered_html_cap' ), 10, 2 );
+               $this->assertTrue( current_user_can( 'unfiltered_html' ) );
+               $instance['content'] = '<script>alert( "Howdy!" );</script>';
+               $expected['content'] = $instance['content'];
+               $result = $widget->update( $instance, array() );
+               $this->assertEquals( $result, $expected );
+               remove_filter( 'map_meta_cap', array( $this, 'grant_unfiltered_html_cap' ) );
+
+               add_filter( 'map_meta_cap', array( $this, 'revoke_unfiltered_html_cap' ), 10, 2 );
+               $this->assertFalse( current_user_can( 'unfiltered_html' ) );
+               $instance['content'] = '<script>alert( "Howdy!" );</script>';
+               $expected['content'] = wp_kses_post( $instance['content'] );
+               $result = $widget->update( $instance, array() );
+               $this->assertEquals( $result, $expected );
+               remove_filter( 'map_meta_cap', array( $this, 'revoke_unfiltered_html_cap' ), 10 );
+       }
+
+       /**
+        * Grant unfiltered_html cap via map_meta_cap.
+        *
+        * @param array  $caps    Returns the user's actual capabilities.
+        * @param string $cap     Capability name.
+        * @return array Caps.
+        */
+       function grant_unfiltered_html_cap( $caps, $cap ) {
+               if ( 'unfiltered_html' === $cap ) {
+                       $caps = array_diff( $caps, array( 'do_not_allow' ) );
+                       $caps[] = 'unfiltered_html';
+               }
+               return $caps;
+       }
+
+       /**
+        * Revoke unfiltered_html cap via map_meta_cap.
+        *
+        * @param array  $caps    Returns the user's actual capabilities.
+        * @param string $cap     Capability name.
+        * @return array Caps.
+        */
+       function revoke_unfiltered_html_cap( $caps, $cap ) {
+               if ( 'unfiltered_html' === $cap ) {
+                       $caps = array_diff( $caps, array( 'unfiltered_html' ) );
+                       $caps[] = 'do_not_allow';
+               }
+               return $caps;
+       }
+}
</ins></span></pre>
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