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<?php
namespace Yoast\WP\SEO\Generators\Schema;
use Yoast\WP\SEO\Config\Schema_IDs;
/**
* Returns ImageObject schema data.
*/
class Main_Image extends Abstract_Schema_Piece {
/**
* Determines whether or not a piece should be added to the graph.
*
* @return bool
*/
public function is_needed() {
return $this->context->indexable->object_type === 'post';
}
/**
* Adds a main image for the current URL to the schema if there is one.
*
* This can be either the featured image, or fall back to the first image in the content of the page.
*
* @return false|array $data Image Schema.
*/
public function generate() {
$image_id = $this->context->canonical . Schema_IDs::PRIMARY_IMAGE_HASH;
$image_schema = $this->get_featured_image( $this->context->id, $image_id );
if ( $image_schema === null ) {
$image_schema = $this->get_first_content_image( $this->context->id, $image_id );
}
if ( $image_schema === null ) {
return false;
}
$this->context->has_image = true;
return $image_schema;
}
/**
* Gets the image schema for the web page based on the featured image.
*
* @param int $post_id The post id.
* @param string $image_id The image schema id.
*
* @return array|null The image schema object or null if there is no featured image.
*/
private function get_featured_image( $post_id, $image_id ) {
if ( ! \has_post_thumbnail( $post_id ) ) {
return null;
}
return $this->helpers->schema->image->generate_from_attachment_id( $image_id, \get_post_thumbnail_id( $post_id ) );
}
/**
* Gets the image schema for the web page based on the first content image image.
*
* @param int $post_id The post id.
* @param string $image_id The image schema id.
*
* @return array|null The image schema object or null if there is no image in the content.
*/
private function get_first_content_image( $post_id, $image_id ) {
$image_url = $this->helpers->image->get_post_content_image( $post_id );
if ( $image_url === '' ) {
return null;
}
return $this->helpers->schema->image->generate_from_url( $image_id, $image_url );
}
}
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