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Filename : image.php
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<?php
/**
 * Server-side rendering of the `core/image` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/image` block on the server,
 * adding a data-id attribute to the element if core/gallery has added on pre-render.
 *
 * @since 5.9.0
 *
 * @param array    $attributes The block attributes.
 * @param string   $content    The block content.
 * @param WP_Block $block      The block object.
 *
 * @return string The block content with the data-id attribute added.
 */
function render_block_core_image( $attributes, $content, $block ) {
	if ( false === stripos( $content, '<img' ) ) {
		return '';
	}

	$processor = new class( $content ) extends WP_HTML_Tag_Processor {
		/**
		 * Return input span for an empty FIGCAPTION element.
		 *
		 * Returns span of input for an empty FIGCAPTION, if currently matched on a
		 * FIGCAPTION opening tag and if the element is properly closed and empty.
		 *
		 * @since 6.9.0
		 *
		 * @return WP_HTML_Span|false Span of input if the element is empty; otherwise false.
		 */
		public function block_core_image_extract_empty_figcaption_element() {
			$this->set_bookmark( 'here' );
			$opener = $this->bookmarks['here'];

			// Allow comments within the definition of “empty.”
			while ( $this->next_token() && '#comment' === $this->get_token_name() ) {
				continue;
			}

			if ( 'FIGCAPTION' !== $this->get_tag() || ! $this->is_tag_closer() ) {
				return false;
			}

			$this->set_bookmark( 'here' );
			$closer = $this->bookmarks['here'];

			return new WP_HTML_Span( $opener->start, $closer->start + $closer->length - $opener->start );
		}
	};

	if ( ! $processor->next_tag( 'img' ) || ! $processor->get_attribute( 'src' ) ) {
		return '';
	}

	$has_id_binding = isset( $attributes['metadata']['bindings']['id'] ) && isset( $attributes['id'] );

	// Ensure the `wp-image-id` classname on the image block supports block bindings.
	if ( $has_id_binding ) {
		// If there's a mismatch with the 'wp-image-' class and the actual id, the id was
		// probably overridden by block bindings. Update it to the correct value.
		// See https://github.com/WordPress/gutenberg/issues/62886 for why this is needed.
		$id                       = $attributes['id'];
		$image_classnames         = $processor->get_attribute( 'class' );
		$class_with_binding_value = "wp-image-$id";
		if ( is_string( $image_classnames ) && ! str_contains( $image_classnames, $class_with_binding_value ) ) {
			$image_classnames = preg_replace( '/wp-image-(\d+)/', $class_with_binding_value, $image_classnames );
			$processor->set_attribute( 'class', $image_classnames );
		}
	}

	// For backwards compatibility, the data-id html attribute is only set for
	// image blocks nested in a gallery. Detect if the image is in a gallery by
	// checking the data-id attribute.
	// See the `block_core_gallery_data_id_backcompatibility` function.
	if ( isset( $attributes['data-id'] ) ) {
		// If there's a binding for the `id`, the `id` attribute is used for the
		// value, since `data-id` does not support block bindings.
		// Else the `data-id` is used for backwards compatibility, since
		// third parties may be filtering its value.
		$data_id = $has_id_binding ? $attributes['id'] : $attributes['data-id'];
		$processor->set_attribute( 'data-id', $data_id );
	}

	/*
	 * If the `caption` attribute is empty and we encounter a `<figcaption>` element,
	 * we take note of its span so we can remove it later.
	 */
	if ( $processor->next_tag( 'FIGCAPTION' ) && empty( $attributes['caption'] ) ) {
		$figcaption_span = $processor->block_core_image_extract_empty_figcaption_element();
	}

	$link_destination  = isset( $attributes['linkDestination'] ) ? $attributes['linkDestination'] : 'none';
	$lightbox_settings = block_core_image_get_lightbox_settings( $block->parsed_block );

	/*
	 * If the lightbox is enabled and the image is not linked, adds the filter and
	 * the JavaScript view file.
	 */
	if (
		isset( $lightbox_settings ) &&
		'none' === $link_destination &&
		isset( $lightbox_settings['enabled'] ) &&
		true === $lightbox_settings['enabled']
	) {
		wp_enqueue_script_module( '@wordpress/block-library/image/view' );

		/*
		 * This render needs to happen in a filter with priority 15 to ensure that
		 * it runs after the duotone filter and that duotone styles are applied to
		 * the image in the lightbox. Lightbox has to work with any plugins that
		 * might use filters as well. Removing this can be considered in the future
		 * if the way the blocks are rendered changes, or if a new kind of filter is
		 * introduced.
		 */
		add_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15, 2 );
	} else {
		/*
		 * Remove the filter if previously added by other Image blocks.
		 */
		remove_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15 );
	}

	$output = $processor->get_updated_html();
	if ( ! empty( $figcaption_span ) ) {
		return substr( $output, 0, $figcaption_span->start ) . substr( $output, $figcaption_span->start + $figcaption_span->length );
	}
	return $output;
}

/**
 * Adds the lightboxEnabled flag to the block data.
 *
 * This is used to determine whether the lightbox should be rendered or not.
 *
 * @since 6.4.0
 *
 * @param array $block Block data.
 *
 * @return array|null Filtered block data.
 */
function block_core_image_get_lightbox_settings( $block ) {
	// Gets the lightbox setting from the block attributes.
	if ( isset( $block['attrs']['lightbox'] ) ) {
		$lightbox_settings = $block['attrs']['lightbox'];
	}

	if ( ! isset( $lightbox_settings ) ) {
		$lightbox_settings = wp_get_global_settings( array( 'lightbox' ), array( 'block_name' => 'core/image' ) );

		// If not present in global settings, check the top-level global settings.
		//
		// NOTE: If no block-level settings are found, the previous call to
		// `wp_get_global_settings` will return the whole `theme.json` structure in
		// which case we can check if the "lightbox" key is present at the top-level
		// of the global settings and use its value.
		if ( isset( $lightbox_settings['lightbox'] ) ) {
			$lightbox_settings = wp_get_global_settings( array( 'lightbox' ) );
		}
	}

	return $lightbox_settings ?? null;
}

/**
 * Adds the directives and layout needed for the lightbox behavior.
 *
 * @since 6.4.0
 *
 * @param string $block_content Rendered block content.
 * @param array  $block         Block object.
 *
 * @return string Filtered block content.
 */
function block_core_image_render_lightbox( $block_content, $block ) {
	/*
	 * If there's no IMG tag in the block then return the given block content
	 * as-is. There's nothing that this code can knowingly modify to add the
	 * lightbox behavior.
	 */
	$processor = new WP_HTML_Tag_Processor( $block_content );
	if ( $processor->next_tag( 'figure' ) ) {
		$processor->set_bookmark( 'figure' );
	}
	if ( ! $processor->next_tag( 'img' ) ) {
		return $block_content;
	}

	$alt               = $processor->get_attribute( 'alt' );
	$img_uploaded_src  = $processor->get_attribute( 'src' );
	$img_class_names   = $processor->get_attribute( 'class' );
	$img_styles        = $processor->get_attribute( 'style' );
	$img_width         = 'none';
	$img_height        = 'none';
	$aria_label        = __( 'Enlarge' );
	$dialog_aria_label = __( 'Enlarged image' );

	if ( isset( $block['attrs']['id'] ) ) {
		$img_uploaded_src = wp_get_attachment_url( $block['attrs']['id'] );
		$img_metadata     = wp_get_attachment_metadata( $block['attrs']['id'] );
		$img_width        = $img_metadata['width'] ?? 'none';
		$img_height       = $img_metadata['height'] ?? 'none';
	}

	// Figure.
	$processor->seek( 'figure' );
	$figure_class_names = $processor->get_attribute( 'class' );
	$figure_styles      = $processor->get_attribute( 'style' );

	// Create unique id and set the image metadata in the state.
	$unique_image_id = uniqid();

	wp_interactivity_state(
		'core/image',
		array(
			'metadata' => array(
				$unique_image_id => array(
					'uploadedSrc'      => $img_uploaded_src,
					'figureClassNames' => $figure_class_names,
					'figureStyles'     => $figure_styles,
					'imgClassNames'    => $img_class_names,
					'imgStyles'        => $img_styles,
					'targetWidth'      => $img_width,
					'targetHeight'     => $img_height,
					'scaleAttr'        => $block['attrs']['scale'] ?? false,
					'ariaLabel'        => $dialog_aria_label,
					'alt'              => $alt,
				),
			),
		)
	);

	$processor->add_class( 'wp-lightbox-container' );
	$processor->set_attribute( 'data-wp-interactive', 'core/image' );
	$processor->set_attribute(
		'data-wp-context',
		wp_json_encode(
			array(
				'imageId' => $unique_image_id,
			),
			JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP
		)
	);
	$processor->set_attribute( 'data-wp-key', $unique_image_id );

	// Image.
	$processor->next_tag( 'img' );
	$processor->set_attribute( 'data-wp-init', 'callbacks.setButtonStyles' );
	$processor->set_attribute( 'data-wp-on--load', 'callbacks.setButtonStyles' );
	$processor->set_attribute( 'data-wp-on-window--resize', 'callbacks.setButtonStyles' );
	// Sets an event callback on the `img` because the `figure` element can also
	// contain a caption, and we don't want to trigger the lightbox when the
	// caption is clicked.
	$processor->set_attribute( 'data-wp-on--click', 'actions.showLightbox' );
	$processor->set_attribute( 'data-wp-class--hide', 'state.isContentHidden' );
	$processor->set_attribute( 'data-wp-class--show', 'state.isContentVisible' );

	$body_content = $processor->get_updated_html();

	// Adds a button alongside image in the body content.
	$img = null;
	preg_match( '/<img[^>]+>/', $body_content, $img );

	$button =
		$img[0]
		. '<button
			class="lightbox-trigger"
			type="button"
			aria-haspopup="dialog"
			aria-label="' . esc_attr( $aria_label ) . '"
			data-wp-init="callbacks.initTriggerButton"
			data-wp-on--click="actions.showLightbox"
			data-wp-style--right="state.imageButtonRight"
			data-wp-style--top="state.imageButtonTop"
		>
			<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
				<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />
			</svg>
		</button>';

	$body_content = preg_replace( '/<img[^>]+>/', $button, $body_content );

	add_action( 'wp_footer', 'block_core_image_print_lightbox_overlay' );

	return $body_content;
}

/**
 * @since 6.5.0
 */
function block_core_image_print_lightbox_overlay() {
	$close_button_label = esc_attr__( 'Close' );

	// If the current theme does NOT have a `theme.json`, or the colors are not
	// defined, it needs to set the background color & close button color to some
	// default values because it can't get them from the Global Styles.
	$background_color   = '#fff';
	$close_button_color = '#000';
	if ( wp_theme_has_theme_json() ) {
		$global_styles_color = wp_get_global_styles( array( 'color' ) );
		if ( ! empty( $global_styles_color['background'] ) ) {
			$background_color = esc_attr( $global_styles_color['background'] );
		}
		if ( ! empty( $global_styles_color['text'] ) ) {
			$close_button_color = esc_attr( $global_styles_color['text'] );
		}
	}

	echo <<<HTML
		<div
			class="wp-lightbox-overlay zoom"
			data-wp-interactive="core/image"
			data-wp-router-region='{ "id": "core/image-overlay", "attachTo": "body" }'
			data-wp-key="wp-lightbox-overlay"
			data-wp-context='{}'
			data-wp-bind--role="state.roleAttribute"
			data-wp-bind--aria-label="state.currentImage.ariaLabel"
			data-wp-bind--aria-modal="state.ariaModal"
			data-wp-class--active="state.overlayEnabled"
			data-wp-class--show-closing-animation="state.overlayOpened"
			data-wp-watch="callbacks.setOverlayFocus"
			data-wp-on--keydown="actions.handleKeydown"
			data-wp-on--touchstart="actions.handleTouchStart"
			data-wp-on--touchmove="actions.handleTouchMove"
			data-wp-on--touchend="actions.handleTouchEnd"
			data-wp-on--click="actions.hideLightbox"
			data-wp-on-window--resize="callbacks.setOverlayStyles"
			data-wp-on-window--scroll="actions.handleScroll"
			data-wp-bind--style="state.overlayStyles"
			tabindex="-1"
			>
				<button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button">
					<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="20" height="20" aria-hidden="true" focusable="false"><path d="m13.06 12 6.47-6.47-1.06-1.06L12 10.94 5.53 4.47 4.47 5.53 10.94 12l-6.47 6.47 1.06 1.06L12 13.06l6.47 6.47 1.06-1.06L13.06 12Z"></path></svg>
				</button>
				<div class="lightbox-image-container">
					<figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.figureStyles">
						<img data-wp-bind--alt="state.currentImage.alt" data-wp-bind--class="state.currentImage.imgClassNames" data-wp-bind--style="state.imgStyles" data-wp-bind--src="state.currentImage.currentSrc">
					</figure>
				</div>
				<div class="lightbox-image-container">
					<figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.figureStyles">
						<img data-wp-bind--alt="state.currentImage.alt" data-wp-bind--class="state.currentImage.imgClassNames" data-wp-bind--style="state.imgStyles" data-wp-bind--src="state.enlargedSrc">
					</figure>
				</div>
				<div class="scrim" style="background-color: $background_color" aria-hidden="true"></div>
		</div>
HTML;
}

/**
 * Registers the `core/image` block on server.
 *
 * @since 5.9.0
 */
function register_block_core_image() {
	register_block_type_from_metadata(
		__DIR__ . '/image',
		array(
			'render_callback' => 'render_block_core_image',
		)
	);
}
add_action( 'init', 'register_block_core_image' );