<?php

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/**

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* Server-side rendering of the `core/video` block.

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*

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* @package WordPress

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*/

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/**

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* Renders the `core/video` block on the server to supply the width and height attributes from the attachment metadata.

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*

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* @since 6.9.0

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*

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* @phpstan-param array{ "id"?: positive-int } $attributes

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*

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* @param array $attributes The block attributes.

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* @param string $content The block content.

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* @return string The block content with the dimensions added.

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*/

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function render_block_core_video( array $attributes, string $content ): string {

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// if the content lacks any video tag, abort.

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if ( ! str_contains( $content, '<video' ) ) {

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return $content;

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}

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// If the 'id' attribute is not populated for a video attachment, abort.

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if (

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! isset( $attributes['id'] ) ||

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! is_int( $attributes['id'] ) ||

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$attributes['id'] <= 0

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) {

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return $content;

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}

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// If the 'id' attribute wasn't for an attachment, abort.

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if ( get_post_type( $attributes['id'] ) !== 'attachment' ) {

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return $content;

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}

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// Get the width and height metadata for the video, and abort if absent or invalid.

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$metadata = wp_get_attachment_metadata( $attributes['id'] );

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if (

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! isset( $metadata['width'], $metadata['height'] ) ||

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! ( is_int( $metadata['width'] ) && is_int( $metadata['height'] ) ) ||

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! ( $metadata['width'] > 0 && $metadata['height'] > 0 )

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) {

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return $content;

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}

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// Locate the VIDEO tag to add the dimensions.

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$p = new WP_HTML_Tag_Processor( $content );

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if ( ! $p->next_tag( array( 'tag_name' => 'VIDEO' ) ) ) {

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return $content;

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}

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$p->set_attribute( 'width', (string) $metadata['width'] );

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$p->set_attribute( 'height', (string) $metadata['height'] );

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/*

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* The aspect-ratio style is needed due to an issue with the CSS spec: <https://github.com/w3c/csswg-drafts/issues/7524>.

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* Note that a style rule using attr() like the following cannot currently be used:

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*

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* .wp-block-video video[width][height] {

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* aspect-ratio: attr(width type(<number>)) / attr(height type(<number>));

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* }

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*

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* This is because this attr() is yet only implemented in Chromium: <https://caniuse.com/css3-attr>.

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*/

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$style = $p->get_attribute( 'style' );

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if ( ! is_string( $style ) ) {

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$style = '';

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}

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$aspect_ratio_style = sprintf( 'aspect-ratio: %d / %d;', $metadata['width'], $metadata['height'] );

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$p->set_attribute( 'style', $aspect_ratio_style . $style );

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return $p->get_updated_html();

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}

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/**

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* Registers the `core/video` block on server.

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*

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* @since 6.9.0

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*/

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function register_block_core_video(): void {

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register_block_type_from_metadata(

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__DIR__ . '/video',

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array(

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'render_callback' => 'render_block_core_video',

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)

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);

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}

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add_action( 'init', 'register_block_core_video' );

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