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<?php
/**
* Server-side rendering of the `core/cover` block.
*
* @package WordPress
*/
/**
* Renders the `core/cover` block on server.
*
* @since 6.0.0
*
* @param array $attributes The block attributes.
* @param string $content The block rendered content.
*
* @return string Returns the cover block markup, if useFeaturedImage is true.
*/
function render_block_core_cover( $attributes, $content ) {
// Handle embed video background.
if (
isset( $attributes['backgroundType'] ) &&
'embed-video' === $attributes['backgroundType'] &&
isset( $attributes['url'] ) &&
! empty( $attributes['url'] ) &&
is_string( $attributes['url'] )
) {
$url = $attributes['url'];
// Use WordPress's native oEmbed processing (includes caching).
$oembed_html = wp_oembed_get( $url );
if ( $oembed_html ) {
// Extract iframe src from the oEmbed HTML.
preg_match( '/src=["\']([^"\']+)["\']/', $oembed_html, $src_matches );
if ( ! empty( $src_matches[1] ) ) {
$iframe_src = $src_matches[1];
// Detect provider from iframe src URL.
$lower_src = strtolower( $iframe_src );
$provider = null;
if ( strpos( $lower_src, 'youtube.com' ) !== false || strpos( $lower_src, 'youtu.be' ) !== false ) {
$provider = 'youtube';
} elseif ( strpos( $lower_src, 'vimeo.com' ) !== false ) {
$provider = 'vimeo';
} elseif ( strpos( $lower_src, 'videopress.com' ) !== false ) {
$provider = 'videopress';
} elseif ( strpos( $lower_src, 'wordpress.tv' ) !== false ) {
$provider = 'wordpress-tv';
}
// Modify iframe src to add background video parameters based on provider.
$parsed_url = wp_parse_url( $iframe_src );
if ( $parsed_url && isset( $parsed_url['host'] ) ) {
// Parse existing query parameters.
$query_params = array();
if ( isset( $parsed_url['query'] ) ) {
parse_str( $parsed_url['query'], $query_params );
}
// Add background video parameters based on provider.
if ( 'youtube' === $provider ) {
$query_params['autoplay'] = '1';
$query_params['mute'] = '1';
$query_params['loop'] = '1';
$query_params['controls'] = '0';
$query_params['modestbranding'] = '1';
$query_params['playsinline'] = '1';
// For loop to work, we need the playlist parameter.
$path = $parsed_url['path'] ?? '';
$path_segments = explode( '/', $path );
$video_id = end( $path_segments );
if ( $video_id ) {
$query_params['playlist'] = $video_id;
}
} elseif ( 'vimeo' === $provider ) {
$query_params['autoplay'] = '1';
$query_params['muted'] = '1';
$query_params['loop'] = '1';
$query_params['background'] = '1';
$query_params['controls'] = '0';
$query_params['transparent'] = '0';
} elseif ( 'videopress' === $provider || 'wordpress-tv' === $provider ) {
$query_params['autoplay'] = '1';
$query_params['loop'] = '1';
$query_params['muted'] = '1';
}
// Rebuild the URL with new parameters.
$iframe_src = $parsed_url['scheme'] . '://' . $parsed_url['host'];
if ( isset( $parsed_url['path'] ) ) {
$iframe_src .= $parsed_url['path'];
}
if ( ! empty( $query_params ) ) {
$iframe_src .= '?' . http_build_query( $query_params );
}
}
// Build the iframe HTML that will replace the figure.
$iframe_html = sprintf(
'<div class="wp-block-cover__video-background wp-block-cover__embed-background"><iframe src="%s" title="Background video" frameborder="0" allow="autoplay; fullscreen"></iframe></div>',
esc_url( $iframe_src )
);
// Use the HTML API to find and replace the figure.wp-block-embed element.
$processor = new WP_HTML_Tag_Processor( $content );
if ( $processor->next_tag(
array(
'tag_name' => 'FIGURE',
'class_name' => 'wp-block-embed',
)
) ) {
// Use regex with PREG_OFFSET_CAPTURE to find the position of the figure element.
// This follows the same pattern used for featured image insertion below.
$figure_pattern = '/<figure\s+[^>]*\bwp-block-embed\b[^>]*>.*?<\/figure>/is';
if ( 1 === preg_match( $figure_pattern, $content, $matches, PREG_OFFSET_CAPTURE ) ) {
$figure_start = $matches[0][1];
$figure_length = strlen( $matches[0][0] );
$figure_end = $figure_start + $figure_length;
// Replace the figure element with the iframe HTML.
$content = substr( $content, 0, $figure_start ) . $iframe_html . substr( $content, $figure_end );
}
}
}
}
return $content;
}
if ( 'image' !== $attributes['backgroundType'] || false === $attributes['useFeaturedImage'] ) {
return $content;
}
$object_position = isset( $attributes['focalPoint'] )
? round( $attributes['focalPoint']['x'] * 100 ) . '% ' . round( $attributes['focalPoint']['y'] * 100 ) . '%'
: null;
if ( ! ( $attributes['hasParallax'] || $attributes['isRepeated'] ) ) {
$attr = array(
'class' => 'wp-block-cover__image-background',
'data-object-fit' => 'cover',
);
if ( $object_position ) {
$attr['data-object-position'] = $object_position;
$attr['style'] = 'object-position:' . $object_position . ';';
}
$image = get_the_post_thumbnail( null, $attributes['sizeSlug'] ?? 'post-thumbnail', $attr );
} else {
if ( in_the_loop() ) {
update_post_thumbnail_cache();
}
$current_featured_image = get_the_post_thumbnail_url( null, $attributes['sizeSlug'] ?? null );
if ( ! $current_featured_image ) {
return $content;
}
$current_thumbnail_id = get_post_thumbnail_id();
$processor = new WP_HTML_Tag_Processor( '<div></div>' );
$processor->next_tag();
$current_alt = trim( strip_tags( get_post_meta( $current_thumbnail_id, '_wp_attachment_image_alt', true ) ) );
if ( $current_alt ) {
$processor->set_attribute( 'role', 'img' );
$processor->set_attribute( 'aria-label', $current_alt );
}
$processor->add_class( 'wp-block-cover__image-background' );
$processor->add_class( 'wp-image-' . $current_thumbnail_id );
if ( $attributes['hasParallax'] ) {
$processor->add_class( 'has-parallax' );
}
if ( $attributes['isRepeated'] ) {
$processor->add_class( 'is-repeated' );
}
$styles = 'background-position:' . ( $object_position ?? '50% 50%' ) . ';';
$styles .= 'background-image:url(' . esc_url( $current_featured_image ) . ');';
$processor->set_attribute( 'style', $styles );
$image = $processor->get_updated_html();
}
/*
* Inserts the featured image between the (1st) cover 'background' `span` and 'inner_container' `div`,
* and removes eventual whitespace characters between the two (typically introduced at template level)
*/
$inner_container_start = '/<div\b[^>]+wp-block-cover__inner-container[\s|"][^>]*>/U';
if ( 1 === preg_match( $inner_container_start, $content, $matches, PREG_OFFSET_CAPTURE ) ) {
$offset = $matches[0][1];
$content = substr( $content, 0, $offset ) . $image . substr( $content, $offset );
}
return $content;
}
/**
* Registers the `core/cover` block renderer on server.
*
* @since 6.0.0
*/
function register_block_core_cover() {
register_block_type_from_metadata(
__DIR__ . '/cover',
array(
'render_callback' => 'render_block_core_cover',
)
);
}
add_action( 'init', 'register_block_core_cover' );