Issue #864: Dequeue some disallowed scripts, and begin subclasses.

The build will fail, as the filtering in widget() isn't present.
There isn't yet a way to instantiate or init() class AMP_Widgets().
But it unregisters the 'Archives' and 'Categories' widgets.
And registers new widgets that subclass them.
@todo: filter the output of widget() in these subclasses.
And add support for the remaining widgets.

includes/class-amp-autoloader.php

@@ -78,6 +78,9 @@ class AMP_Autoloader {
 		'AMP_Image_Dimension_Extractor'               => 'includes/utils/class-amp-image-dimension-extractor',
 		'AMP_String_Utils'                            => 'includes/utils/class-amp-string-utils',
 		'AMP_WP_Utils'                                => 'includes/utils/class-amp-wp-utils',
+		'AMP_Widget_Archives'                         => 'includes/widgets/class-amp-widget-archives',
+		'AMP_Widget_Categories'                       => 'includes/widgets/class-amp-widget-categories',
+		'AMP_Widgets'                                 => 'includes/widgets/class-amp-widgets',
 		'WPCOM_AMP_Polldaddy_Embed'                   => 'wpcom/class-amp-polldaddy-embed',
 		'AMP_Test_Stub_Sanitizer'                     => 'tests/stubs',
 		'AMP_Test_World_Sanitizer'                    => 'tests/stubs',

includes/widgets/class-amp-widget-archives.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Class AMP_Widget_Archives
+ *
+ * @package AMP
+ */
+
+/**
+ * Class AMP_Widget_Archives
+ *
+ * @package AMP
+ */
+class AMP_Widget_Archives extends WP_Widget_Archives {
+
+	/**
+	 * Echoes the markup of the widget.
+	 *
+	 * @todo filter $output, to strip the onchange attribute
+	 * @see https://github.com/Automattic/amp-wp/issues/864
+	 * @param array $args Widget display data.
+	 * @param array $instance Data for widget.
+	 * @return void.
+	 */
+	public function widget( $args, $instance ) {
+		ob_start();
+		parent::widget( $args, $instance );
+		$output = ob_get_clean();
+		echo $output; // WPCS: XSS ok.
+	}
+
+}

includes/widgets/class-amp-widget-categories.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Class AMP_Widget_Categories
+ *
+ * @package AMP
+ */
+
+/**
+ * Class AMP_Widget_Categories
+ *
+ * @package AMP
+ */
+class AMP_Widget_Categories extends WP_Widget_Categories {
+
+	/**
+	 * Echoes the markup of the widget.
+	 *
+	 * @todo filter $output, to strip the <script> tag.
+	 * @see https://github.com/Automattic/amp-wp/issues/864
+	 * @param array $args Widget display data.
+	 * @param array $instance Data for widget.
+	 * @return void.
+	 */
+	public function widget( $args, $instance ) {
+		ob_start();
+		parent::widget( $args, $instance );
+		$output = ob_get_clean();
+		echo $output; // WPCS: XSS ok.
+	}
+
+}

includes/widgets/class-amp-widgets.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * Register widgets, and add actions.
+ *
+ * @package AMP
+ */
+
+/**
+ * Register the widgets.
+ */
+class AMP_Widgets {
+
+	/**
+	 * Add the actions.
+	 *
+	 * @return void.
+	 */
+	public function init() {
+		add_action( 'widgets_init', array( $this, 'register_widgets' ) );
+		add_action( 'show_recent_comments_widget_style', '__return_false' );
+		add_action( 'wp_footer', array( $this, 'dequeue_scripts' ) );
+	}
+
+	/**
+	 * Add the filters.
+	 *
+	 * @return void.
+	 */
+	public function register_widgets() {
+		$widgets = self::get_widgets();
+		foreach ( $widgets as $native_wp_widget => $amp_widget ) {
+			unregister_widget( $native_wp_widget );
+			register_widget( $amp_widget );
+		}
+	}
+
+	/**
+	 * Get the widgets to unregister and register.
+	 *
+	 * @return array $widgets An associative array, with the previous WP widget mapped to the new AMP widget.
+	 */
+	public function get_widgets() {
+		return array(
+			'WP_Widget_Archives'   => 'AMP_Widget_Archives',
+			'WP_Widget_Categories' => 'AMP_Widget_Categories',
+		);
+	}
+
+	/**
+	 * Dequeue widget scripts and styles, which aren't allowed in AMP.
+	 *
+	 * Uses the action 'wp_footer' in order to prevent
+	 * 'wp_print_footer_scripts' from outputting the scripts.
+	 *
+	 * @return void.
+	 */
+	public function dequeue_scripts() {
+		wp_dequeue_script( 'wp-mediaelement' );
+		wp_dequeue_script( 'mediaelement-vimeo' );
+		wp_dequeue_style( 'wp-mediaelement' );
+	}
+
+}

tests/test-class-amp-widget-archives.php

@@ -0,0 +1,71 @@
+<?php
+/**
+ * Tests for class AMP_Widget_Archives.
+ *
+ * @package AMP
+ */
+
+/**
+ * Tests for class AMP_Widget_Archives.
+ *
+ * @package WidgetLiveEditor
+ */
+class Test_AMP_Widget_Archives extends WP_UnitTestCase {
+	/**
+	 * Instance of the widget.
+	 *
+	 * @var object
+	 */
+	public $instance;
+
+	/**
+	 * Setup.
+	 *
+	 * @inheritdoc
+	 */
+	public function setUp() {
+		parent::setUp();
+		$amp_widgets = new AMP_Widgets();
+		$amp_widgets->register_widgets();
+		$this->instance = new AMP_Widget_Archives();
+	}
+
+	/**
+	 * Test construct().
+	 *
+	 * @see AMP_Widget_Archives::__construct().
+	 */
+	public function test_construct() {
+		global $wp_widget_factory;
+		$amp_archives = $wp_widget_factory->widgets['AMP_Widget_Archives'];
+		$this->assertEquals( 'AMP_Widget_Archives', get_class( $amp_archives ) );
+		$this->assertEquals( 'archives', $amp_archives->id_base );
+		$this->assertEquals( 'Archives', $amp_archives->name );
+		$this->assertEquals( 'widget_archive', $amp_archives->widget_options['classname'] );
+		$this->assertEquals( true, $amp_archives->widget_options['customize_selective_refresh'] );
+		$this->assertEquals( 'A monthly archive of your site&#8217;s Posts.', $amp_archives->widget_options['description'] );
+	}
+
+	/**
+	 * Test widget().
+	 *
+	 * @see AMP_Widget_Archives::widget().
+	 */
+	public function test_widget() {
+		$arguments = array(
+			'before_widget' => '<div>',
+			'after_widget'  => '</div>',
+			'before_title'  => '<h2>',
+			'after_title'   => '</h2>',
+		);
+		$instance  = array(
+			'title'    => 'Test Archives Widget',
+			'dropdown' => 1,
+		);
+		ob_start();
+		$this->instance->widget( $arguments, $instance );
+		$output = ob_get_clean();
+
+		$this->assertFalse( strpos( $output, 'onchange=' ) );
+	}
+}

tests/test-class-amp-widget-categories.php

@@ -0,0 +1,71 @@
+<?php
+/**
+ * Tests for class AMP_Widget_Categories.
+ *
+ * @package AMP
+ */
+
+/**
+ * Tests for class AMP_Widget_Categories.
+ *
+ * @package WidgetLiveEditor
+ */
+class Test_AMP_Widget_Categories extends WP_UnitTestCase {
+	/**
+	 * Instance of the widget.
+	 *
+	 * @var object
+	 */
+	public $instance;
+
+	/**
+	 * Setup.
+	 *
+	 * @inheritdoc
+	 */
+	public function setUp() {
+		parent::setUp();
+		$amp_widgets = new AMP_Widgets();
+		$amp_widgets->register_widgets();
+		$this->instance = new AMP_Widget_Categories();
+	}
+
+	/**
+	 * Test construct().
+	 *
+	 * @see AMP_Widget_Categories::__construct().
+	 */
+	public function test_construct() {
+		global $wp_widget_factory;
+		$amp_categories = $wp_widget_factory->widgets['AMP_Widget_Categories'];
+		$this->assertEquals( 'AMP_Widget_Categories', get_class( $amp_categories ) );
+		$this->assertEquals( 'categories', $amp_categories->id_base );
+		$this->assertEquals( 'Categories', $amp_categories->name );
+		$this->assertEquals( 'widget_categories', $amp_categories->widget_options['classname'] );
+		$this->assertEquals( true, $amp_categories->widget_options['customize_selective_refresh'] );
+		$this->assertEquals( 'A list or dropdown of categories.', $amp_categories->widget_options['description'] );
+	}
+
+	/**
+	 * Test widget().
+	 *
+	 * @see AMP_Widget_Categories::widget().
+	 */
+	public function test_widget() {
+		$arguments = array(
+			'before_widget' => '<div>',
+			'after_widget'  => '</div>',
+			'before_title'  => '<h2>',
+			'after_title'   => '</h2>',
+		);
+		$instance  = array(
+			'title'    => 'Test Categories Widget',
+			'dropdown' => 1,
+		);
+		ob_start();
+		$this->instance->widget( $arguments, $instance );
+		$output = ob_get_clean();
+
+		$this->assertFalse( strpos( $output, '<script type=' ) );
+	}
+}

tests/test-class-amp-widgets.php

@@ -0,0 +1,67 @@
+<?php
+/**
+ * Tests for class AMP_Widgets.
+ *
+ * @package AMP
+ */
+
+/**
+ * Tests for class AMP_Widgets.
+ */
+class Test_AMP_Widgets extends WP_UnitTestCase {
+	/**
+	 * Instance of AMP_Widgets.
+	 *
+	 * @var object
+	 */
+	public $instance;
+
+	/**
+	 * Setup.
+	 *
+	 * @inheritdoc
+	 */
+	public function setUp() {
+		parent::setUp();
+		$this->instance = new AMP_Widgets();
+	}
+
+	/**
+	 * Test init().
+	 *
+	 * @see AMP_Widgets::init().
+	 */
+	public function test_init() {
+		$this->instance->init();
+		$this->assertEquals( 10, has_filter( 'widgets_init', array( $this->instance, 'register_widgets' ) ) );
+		$this->assertEquals( 10, has_filter( 'show_recent_comments_widget_style', '__return_false' ) );
+		$this->assertEquals( 10, has_action( 'wp_footer', array( $this->instance, 'dequeue_scripts' ) ) );
+	}
+
+	/**
+	 * Test register_widgets().
+	 *
+	 * @covers AMP_Widgets::get_widgets().
+	 * @see AMP_Widgets::register_widgets().
+	 */
+	public function test_register_widgets() {
+		global $wp_widget_factory;
+		$this->instance->register_widgets();
+		$this->assertFalse( isset( $wp_widget_factory->widgets['WP_Widget_Archives'] ) );
+		$this->assertEquals( 'AMP_Widget_Archives', get_class( $wp_widget_factory->widgets['AMP_Widget_Archives'] ) );
+		$this->assertFalse( isset( $wp_widget_factory->widgets['WP_Widget_Categories'] ) );
+		$this->assertEquals( 'AMP_Widget_Categories', get_class( $wp_widget_factory->widgets['AMP_Widget_Categories'] ) );
+	}
+
+	/**
+	 * Test dequeue_scripts().
+	 *
+	 * @see AMP_Widgets::dequeue_scripts().
+	 */
+	public function test_dequeue_scripts() {
+		$this->assertFalse( wp_script_is( 'wp-mediaelement' ) );
+		$this->assertFalse( wp_script_is( 'mediaelement-vimeo' ) );
+		$this->assertFalse( wp_style_is( 'wp-mediaelement' ) );
+	}
+
+}