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<?php
/**
 * Class AMP_Core_Block_Handler
 *
 * @package AMP
 */

use AmpProject\Dom\Document;
use AmpProject\Html\Attribute;

/**
 * Class AMP_Core_Block_Handler
 *
 * @since 1.0
 * @internal
 */
class AMP_Core_Block_Handler extends AMP_Base_Embed_Handler {

/**
	 * Attribute to store the original width on a video or iframe just before WordPress removes it.
	 *
	 * @see AMP_Core_Block_Handler::preserve_widget_text_element_dimensions()
	 * @see AMP_Core_Block_Handler::process_text_widgets()
	 * @var string
	 */
	const AMP_PRESERVED_WIDTH_ATTRIBUTE_NAME = 'amp-preserved-width';

/**
	 * Attribute to store the original height on a video or iframe just before WordPress removes it.
	 *
	 * @see AMP_Core_Block_Handler::preserve_widget_text_element_dimensions()
	 * @see AMP_Core_Block_Handler::process_text_widgets()
	 * @var string
	 */
	const AMP_PRESERVED_HEIGHT_ATTRIBUTE_NAME = 'amp-preserved-height';

/**
	 * Count of the category widgets encountered.
	 *
	 * @var int
	 */
	private $category_widget_count = 0;

/**
	 * Count of the navigation blocks encountered.
	 *
	 * @var int
	 */
	private $navigation_block_count = 0;

/**
	 * Methods to ampify blocks.
	 *
	 * @var array
	 */
	protected $block_ampify_methods = [
		'core/categories' => 'ampify_categories_block',
		'core/archives'   => 'ampify_archives_block',
		'core/video'      => 'ampify_video_block',
		'core/file'       => 'ampify_file_block',
		'core/gallery'    => 'ampify_gallery_block',
		'core/navigation' => 'ampify_navigation_block',
	];

/**
	 * Register embed.
	 */
	public function register_embed() {
		add_filter( 'render_block', [ $this, 'filter_rendered_block' ], 0, 2 );
		add_filter( 'widget_text_content', [ $this, 'preserve_widget_text_element_dimensions' ], PHP_INT_MAX );
	}

/**
	 * Unregister embed.
	 */
	public function unregister_embed() {
		remove_filter( 'render_block', [ $this, 'filter_rendered_block' ], 0 );
		remove_filter( 'widget_text_content', [ $this, 'preserve_widget_text_element_dimensions' ], PHP_INT_MAX );
	}

/**
	 * Filters the content of a single block to make it AMP valid.
	 *
	 * @param string $block_content The block content about to be appended.
	 * @param array  $block         The full block, including name and attributes.
	 * @return string Filtered block content.
	 */
	public function filter_rendered_block( $block_content, $block ) {
		if ( ! isset( $block['blockName'] ) ) {
			return $block_content; // @codeCoverageIgnore
		}

if ( isset( $block['attrs'] ) && 'core/shortcode' !== $block['blockName'] ) {
			$injected_attributes    = '';
			$prop_attribute_mapping = [
				'ampCarousel' => 'data-amp-carousel',
				'ampLightbox' => 'data-amp-lightbox',
			];
			foreach ( $prop_attribute_mapping as $prop => $attr ) {
				if ( isset( $block['attrs'][ $prop ] ) ) {
					$property_value = $block['attrs'][ $prop ];
					if ( is_bool( $property_value ) ) {
						$property_value = $property_value ? 'true' : 'false';
					}

$injected_attributes .= sprintf( ' %s="%s"', $attr, esc_attr( $property_value ) );
				}
			}
			if ( $injected_attributes ) {
				$block_content = preg_replace( '/(<\w+)/', '$1' . $injected_attributes, $block_content, 1 );
			}
		}

if ( isset( $this->block_ampify_methods[ $block['blockName'] ] ) ) {
			$method_name   = $this->block_ampify_methods[ $block['blockName'] ];
			$block_content = $this->{$method_name}( $block_content, $block );
		} elseif ( 'core/image' === $block['blockName'] || 'core/audio' === $block['blockName'] ) {
			/*
			 * While the video block placeholder just outputs an empty video element, the placeholders for image and
			 * audio blocks output empty <img> and <audio> respectively. These will result in AMP validation errors,
			 * so we need to empty out the block content to prevent this from happening. Note that <source> is used
			 * for <img> because eventually the image block could use <picture>.
			 */
			if ( ! preg_match( '/src=|<source/', $block_content ) ) {
				$block_content = '';
			}
		}
		return $block_content;
	}

/**
	 * Fix rendering of categories block when displayAsDropdown.
	 *
	 * This excludes the disallowed JS scrips, adds <form> tags, and uses on:change for <select>.
	 *
	 * @see render_block_core_categories()
	 *
	 * @param string $block_content Block content.
	 * @return string Rendered.
	 */
	public function ampify_categories_block( $block_content ) {
		static $block_id = 0;
		$block_id++;

$form_id = "wp-block-categories-dropdown-{$block_id}-form";

// Remove output of build_dropdown_script_block_core_categories().
		$block_content = preg_replace( '#<script.+?</script>#s', '', $block_content );

$form = sprintf(
			'<form action="%s" method="get" target="_top" id="%s">',
			esc_url( home_url() ),
			esc_attr( $form_id )
		);

$block_content = preg_replace(
			'#(<select)(.+</select>)#s',
			$form . '$1' . sprintf( ' on="change:%1$s.submit"', esc_attr( $form_id ) ) . '$2</form>',
			$block_content,
			1
		);

return $block_content;
	}

/**
	 * Fix rendering of archives block when displayAsDropdown.
	 *
	 * This replaces disallowed script with the use of on:change for <select>.
	 *
	 * @see render_block_core_archives()
	 *
	 * @param string $block_content Block content.
	 * @return string Rendered.
	 */
	public function ampify_archives_block( $block_content ) {

// Eliminate use of uniqid(). Core should be using wp_unique_id() here.
		static $block_id = 0;
		$block_id++;
		$block_content = preg_replace( '/(?<="wp-block-archives-)\w+(?=")/', $block_id, $block_content );

// Replace onchange with on attribute.
		$block_content = preg_replace(
			'/onchange=".+?"/',
			'on="change:AMP.navigateTo(url=event.value)"',
			$block_content
		);

return $block_content;
	}

/**
	 * Ampify video block.
	 *
	 * Inject the video attachment's dimensions if available. This prevents having to try to look up the attachment
	 * post by the video URL in `\AMP_Video_Sanitizer::filter_video_dimensions()`.
	 *
	 * @see \AMP_Video_Sanitizer::filter_video_dimensions()
	 *
	 * @param string $block_content The block content about to be appended.
	 * @param array  $block         The full block, including name and attributes.
	 * @return string Filtered block content.
	 */
	public function ampify_video_block( $block_content, $block ) {
		if ( empty( $block['attrs']['id'] ) || 'attachment' !== get_post_type( $block['attrs']['id'] ) ) {
			return $block_content;
		}

$meta_data = wp_get_attachment_metadata( $block['attrs']['id'] );
		if ( ! isset( $meta_data['width'], $meta_data['height'] ) ) {
			return $block_content;
		}

$block_content = preg_replace_callback(
			'/(?<=<video)\s[^>]+/',
			static function ( $matches ) use ( $meta_data ) {
				$attrs = $matches[0];
				if ( ! preg_match( '/\s(width|height|style)=/', $attrs ) ) {
					$attrs .= sprintf(
						' width="%1$d" height="%2$d" style="aspect-ratio:%1$d/%2$d"',
						$meta_data['width'],
						$meta_data['height']
					);
				}
				return $attrs;
			},
			$block_content,
			1
		);

return $block_content;
	}

/**
	 * Ampify file block.
	 *
	 * Fix handling of PDF previews by dequeuing wp-block-library-file and ensuring preview element has 100% width.
	 *
	 * @see \AMP_Object_Sanitizer::sanitize_pdf()
	 *
	 * @param string $block_content The block content about to be appended.
	 * @param array  $block         The full block, including name and attributes.
	 * @return string Filtered block content.
	 */
	public function ampify_file_block( $block_content, $block ) {
		if (
			empty( $block['attrs']['displayPreview'] )
			||
			empty( $block['attrs']['href'] )
			||
			'.pdf' !== substr( wp_parse_url( $block['attrs']['href'], PHP_URL_PATH ), -4 )
		) {
			return $block_content;
		}

add_action( 'wp_print_scripts', [ $this, 'dequeue_block_library_file_script' ], 0 );
		add_action( 'wp_print_footer_scripts', [ $this, 'dequeue_block_library_file_script' ], 0 );

// In Twenty Twenty the PDF embed fails to render due to the parent of the embed having
		// the style rule `display: flex`. Ensuring the element has 100% width fixes that issue.
		$block_content = preg_replace(
			':(?=</div>):',
			'<style id="amp-wp-file-block">.wp-block-file > .wp-block-file__embed { width:100% }</style>',
			$block_content,
			1
		);

return $block_content;
	}

/**
	 * Ampify gallery block.
	 *
	 * Apply data-amp-lightbox attribute only to descendant image blocks.
	 *
	 * @since 2.2.1
	 *
	 * @param string $block_content The block content about to be appended.
	 * @param array  $block         The full block, including name and attributes.
	 * @return string Filtered block content.
	 */
	public function ampify_gallery_block( $block_content, $block ) {
		// Skip legacy gallery blocks.
		if ( ! empty( $block['attrs']['ids'] ) ) {
			return $block_content;
		}

$block_content = preg_replace( '/\sdata-amp-lightbox="\w+"/', '', $block_content );

// Bail out early if there are no images in the gallery or the lightbox feature is not enabled.
		if ( empty( $block['innerBlocks'] ) || empty( $block['attrs']['ampLightbox'] ) ) {
			return $block_content;
		}

// Add data attributes to figure elements that are nested in the gallery block.
		// Note that the first match is the gallery block itself which doesn't need the data-amp-lightbox attribute.
		$figure_count  = 0;
		$block_content = preg_replace_callback(
			'/(?<=<figure\s)/',
			static function () use ( &$figure_count ) {
				return 0 < $figure_count++ ? 'data-amp-lightbox="true" ' : '';
			},
			$block_content
		);

return $block_content;
	}

/**
	 * Dequeue wp-block-library-file script.
	 */
	public function dequeue_block_library_file_script() {
		wp_dequeue_script( 'wp-block-library-file' );
	}

/**
	 * Ampify navigation block contained by <nav> element.
	 *
	 * @since 2.2.1
	 *
	 * @param string $block_content The block content about to be appended.
	 * @param array  $block         The full block, including name and attributes.
	 *
	 * @return string Filtered block content.
	 */
	public function ampify_navigation_block( $block_content, $block ) {
		if ( 0 === $this->navigation_block_count ) {
			add_action( 'wp_print_scripts', [ $this, 'dequeue_block_navigation_view_script' ], 0 );
			add_action( 'wp_print_footer_scripts', [ $this, 'dequeue_block_navigation_view_script' ], 0 );
		}

$is_interactive_block = str_contains(
			preg_match( '/(?<=<nav)\s[^>]+/', $block_content, $matches ) ? $matches[0] : '',
			'data-wp-interactive'
		);

$this->navigation_block_count++;
		$modal_state_property = "modal_{$this->navigation_block_count}_expanded";

// Set `aria-expanded` value of submenus whenever AMP state changes.
		$submenu_toggles_count = 0;
		$block_content         = preg_replace_callback(
			'/(?<=<button)\s[^>]+/',
			static function ( $matches ) use ( $modal_state_property, &$submenu_toggles_count ) {
				$new_block_content = $matches[0];

if ( false === strpos( $new_block_content, 'wp-block-navigation-submenu__toggle' ) ) {
					return $new_block_content;
				}

$submenu_toggles_count++;

$submenu_state_property = str_replace(
					'expanded',
					'submenu_' . $submenu_toggles_count . '_expanded',
					$modal_state_property
				);

// Set `aria-expanded` value of submenus whenever AMP state changes.
				return str_replace(
					' aria-expanded',
					sprintf(
						' on="tap:AMP.setState({ %1$s: !%1$s })" [aria-expanded]="%1$s ? \'true\' : \'false\'" aria-expanded',
						esc_attr( $submenu_state_property )
					),
					$new_block_content
				);
			},
			$block_content
		);

// In case of the "Mobile" option value, the `overlayMenu` attribute is not set at all.
		if ( ! empty( $block['attrs']['overlayMenu'] ) && 'never' === $block['attrs']['overlayMenu'] ) {
			return $block_content;
		}

$block_content = preg_replace_callback(
			'/(?<=<button)\s[^>]+/',
			static function ( $matches ) use ( $modal_state_property, $is_interactive_block ) {
				$new_block_content = $matches[0];

// Skip submenu toggles.
				if ( false !== strpos( $new_block_content, 'wp-block-navigation-submenu__toggle' ) ) {
					return $new_block_content;
				}

if ( $is_interactive_block ) {
					// Replace `data-wp-on--click` or `data-wp-on-async--click` with AMP state on submenu open button.
					if ( false !== strpos( $new_block_content, 'wp-block-navigation__responsive-container-open' ) ) {
						$new_block_content = preg_replace(
							'/\sdata-wp-on(?:-async)?--click="[^"]+"/',
							sprintf( ' on="tap:AMP.setState({ %1$s: !%1$s })"', esc_attr( $modal_state_property ) ),
							$new_block_content
						);
					}

// Replace `data-wp-on--click` or `data-wp-on-async--click` with AMP state on submenu close button.
					if ( false !== strpos( $new_block_content, 'wp-block-navigation__responsive-container-close' ) ) {
						$new_block_content = preg_replace(
							'/\sdata-wp-on(?:-async)?--click="[^"]+"/',
							sprintf( ' on="tap:AMP.setState({ %1$s: !%1$s })"', esc_attr( $modal_state_property ) ),
							$new_block_content
						);
					}
				} else {
					// Replace micromodal toggle logic bound with buttons with AMP state to open the modal.
					$new_block_content = preg_replace(
						'/\sdata-micromodal-trigger="modal-\w+"/',
						sprintf( ' on="tap:AMP.setState({ %1$s: !%1$s })"', esc_attr( $modal_state_property ) ),
						$new_block_content
					);

// Replace micromodal toggle logic bound with buttons with AMP state to close the modal.
					$new_block_content = str_replace(
						' data-micromodal-close',
						sprintf( ' on="tap:AMP.setState({ %1$s: !%1$s })"', esc_attr( $modal_state_property ) ),
						$new_block_content
					);
				}

// Set `aria-expanded` value whenever AMP state changes.
				return str_replace(
					' aria-expanded',
					sprintf(
						' [aria-expanded]="%s ? \'true\' : \'false\'" aria-expanded',
						esc_attr( $modal_state_property )
					),
					$new_block_content
				);
			},
			$block_content
		);

// Change a responsive container class name and aria-hidden value based on the AMP state.
		$block_content = preg_replace_callback(
			'/(?><.+\sclass="([^"]*wp-block-navigation__responsive-container(?>\s[^"]*)?)"[^>]*>)/',
			static function ( $matches ) use ( $modal_state_property ) {
				$new_block_content = str_replace(
					' class=',
					sprintf(
						' [aria-hidden]="%1$s ? \'false\' : \'true\'" aria-hidden="true" [class]="%1$s ? \'%2$s is-menu-open has-modal-open\' : \'%2$s\'" class=',
						esc_attr( $modal_state_property ),
						esc_attr( $matches[1] )
					),
					$matches[0]
				);

return $new_block_content;
			},
			$block_content
		);

return $block_content;
	}

/**
	 * Dequeue wp-block-navigation-view script.
	 *
	 * @since 2.2.1
	 */
	public function dequeue_block_navigation_view_script() {
		wp_dequeue_script( 'wp-block-navigation-view' );
		wp_dequeue_script( 'wp-block-navigation-view-2' );
	}

/**
	 * Sanitize widgets that are not added via Gutenberg.
	 *
	 * @param Document $dom  Document.
	 * @param array    $args Args passed to sanitizer.
	 */
	public function sanitize_raw_embeds( Document $dom, $args = [] ) {
		$this->process_categories_widgets( $dom );
		$this->process_archives_widgets( $dom, $args );
		$this->process_text_widgets( $dom );
	}

/**
	 * Process "Categories" widgets.
	 *
	 * @since 2.0
	 *
	 * @param Document $dom Document.
	 */
	private function process_categories_widgets( Document $dom ) {
		$selects = $dom->xpath->query( '//form/select[ @name = "cat" ]' );
		foreach ( $selects as $select ) {
			if ( ! $select instanceof DOMElement ) {
				continue; // @codeCoverageIgnore
			}
			$form = $select->parentNode;
			if ( ! $form instanceof DOMElement || ! $form->parentNode instanceof DOMElement ) {
				continue; // @codeCoverageIgnore
			}
			$script = $dom->xpath->query( './/script[ contains( text(), "onCatChange" ) ]', $form->parentNode )->item( 0 );
			if ( ! $script instanceof DOMElement ) {
				continue; // @codeCoverageIgnore
			}

$this->category_widget_count++;
			$id = sprintf( 'amp-wp-widget-categories-%d', $this->category_widget_count );

$form->setAttribute( 'id', $id );

AMP_DOM_Utils::add_amp_action( $select, 'change', sprintf( '%s.submit', $id ) );
			$script->parentNode->removeChild( $script );
		}
	}

/**
	 * Process "Archives" widgets.
	 *
	 * @since 2.0
	 *
	 * @param Document $dom  Select node retrieved from the widget.
	 * @param array    $args Args passed to sanitizer.
	 */
	private function process_archives_widgets( Document $dom, $args = [] ) {
		$selects = $dom->xpath->query( '//select[ @name = "archive-dropdown" and starts-with( @id, "archives-dropdown-" ) ]' );
		foreach ( $selects as $select ) {
			if ( ! $select instanceof DOMElement ) {
				continue; // @codeCoverageIgnore
			}

$script = $dom->xpath->query( './/script[ contains( text(), "onSelectChange" ) ]', $select->parentNode )->item( 0 );
			if ( $script ) {
				$script->parentNode->removeChild( $script );
			} elseif ( $select->hasAttribute( 'onchange' ) ) {
				// Special condition for WordPress<=5.1.
				$select->removeAttribute( 'onchange' );
			} else {
				continue;
			}

AMP_DOM_Utils::add_amp_action( $select, 'change', 'AMP.navigateTo(url=event.value)' );

// When AMP-to-AMP linking is enabled, ensure links go to the AMP version.
			if ( ! empty( $args['amp_to_amp_linking_enabled'] ) ) {
				foreach ( $dom->xpath->query( '//option[ @value != "" ]', $select ) as $option ) {
					/**
					 * Option element.
					 *
					 * @var DOMElement $option
					 */
					$option->setAttribute( 'value', amp_add_paired_endpoint( $option->getAttribute( 'value' ) ) );
				}
			}
		}
	}

/**
	 * Preserve dimensions of elements in a Text widget to later restore to circumvent WordPress core stripping them out.
	 *
	 * Core strips out the dimensions to prevent the element being made too wide for the sidebar. This is not a concern
	 * in AMP because of responsive sizing. So this logic is here to undo what core is doing.
	 *
	 * @since 2.0
	 * @see WP_Widget_Text::inject_video_max_width_style()
	 * @see AMP_Core_Block_Handler::process_text_widgets()
	 *
	 * @param string $content Content.
	 * @return string Content.
	 */
	public function preserve_widget_text_element_dimensions( $content ) {
		$content = preg_replace_callback(
			'#<(video|iframe|object|embed)\s[^>]*>#si',
			static function ( $matches ) {
				$html = $matches[0];
				$html = preg_replace( '/(?=\sheight="(\d+)")/', ' ' . self::AMP_PRESERVED_HEIGHT_ATTRIBUTE_NAME . '="$1" ', $html );
				$html = preg_replace( '/(?=\swidth="(\d+)")/', ' ' . self::AMP_PRESERVED_WIDTH_ATTRIBUTE_NAME . '="$1" ', $html );
				return $html;
			},
			$content
		);

return $content;
	}

/**
	 * Process "Text" widgets.
	 *
	 * @since 2.0
	 * @see AMP_Core_Block_Handler::preserve_widget_text_element_dimensions()
	 *
	 * @param Document $dom Select node retrieved from the widget.
	 */
	private function process_text_widgets( Document $dom ) {
		foreach ( $dom->xpath->query( '//div[ @class = "textwidget" ]' ) as $text_widget ) {
			// Restore the width/height attributes which were preserved in preserve_widget_text_element_dimensions.
			foreach ( $dom->xpath->query( sprintf( './/*[ @%s or @%s ]', self::AMP_PRESERVED_WIDTH_ATTRIBUTE_NAME, self::AMP_PRESERVED_HEIGHT_ATTRIBUTE_NAME ), $text_widget ) as $element ) {
				/** @var DOMElement $element */
				if ( $element->hasAttribute( self::AMP_PRESERVED_WIDTH_ATTRIBUTE_NAME ) ) {
					$element->setAttribute( Attribute::WIDTH, $element->getAttribute( self::AMP_PRESERVED_WIDTH_ATTRIBUTE_NAME ) );
					$element->removeAttribute( self::AMP_PRESERVED_WIDTH_ATTRIBUTE_NAME );
				}
				if ( $element->hasAttribute( self::AMP_PRESERVED_HEIGHT_ATTRIBUTE_NAME ) ) {
					$element->setAttribute( Attribute::HEIGHT, $element->getAttribute( self::AMP_PRESERVED_HEIGHT_ATTRIBUTE_NAME ) );
					$element->removeAttribute( self::AMP_PRESERVED_HEIGHT_ATTRIBUTE_NAME );
				}
			}

/*
			 * Remove inline width style which is added to video shortcode but which overruns the container.
			 * Normally this width gets overridden by wp-mediaelement.css to be max-width: 100%, but since
			 * MediaElement.js is not used in AMP this stylesheet is not included. In any case, videos in AMP are
			 * responsive so this is built-in. Note also the style rule for .wp-video in amp-default.css.
			 */
			foreach ( $dom->xpath->query( './/div[ @class = "wp-video" and @style ]', $text_widget ) as $element ) {
				/** @var DOMElement $element */
				$element->removeAttribute( 'style' );
			}
		}
	}
}

Editing: class-amp-core-block-handler.php

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