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<?php
namespace Yoast\WP\SEO\Helpers\Schema;
use Yoast\WP\SEO\Helpers\Image_Helper as Main_Image_Helper;
/**
* Class Image_Helper.
*/
class Image_Helper {
/**
* The HTML helper.
*
* @var HTML_Helper
*/
private $html;
/**
* The language helper.
*
* @var Language_Helper
*/
private $language;
/**
* Represents the main image helper.
*
* @var Main_Image_Helper
*/
private $image;
/**
* Image_Helper constructor.
*
* @codeCoverageIgnore It handles dependencies.
*
* @param HTML_Helper $html The HTML helper.
* @param Language_Helper $language The language helper.
* @param Main_Image_Helper $image The 'main' image helper.
*/
public function __construct( HTML_Helper $html, Language_Helper $language, Main_Image_Helper $image ) {
$this->html = $html;
$this->language = $language;
$this->image = $image;
}
/**
* Find an image based on its URL and generate a Schema object for it.
*
* @param string $schema_id The `@id` to use for the returned image.
* @param string $url The image URL to base our object on.
* @param string $caption An optional caption.
* @param bool $add_hash Whether a hash will be added as a suffix in the @id.
* @param bool $use_link_table Whether the SEO Links table will be used to retrieve the id.
*
* @return array Schema ImageObject array.
*/
public function generate_from_url( $schema_id, $url, $caption = '', $add_hash = false, $use_link_table = true ) {
$attachment_id = $this->image->get_attachment_by_url( $url, $use_link_table );
if ( $attachment_id > 0 ) {
return $this->generate_from_attachment_id( $schema_id, $attachment_id, $caption, $add_hash );
}
return $this->simple_image_object( $schema_id, $url, $caption, $add_hash );
}
/**
* Retrieve data about an image from the database and use it to generate a Schema object.
*
* @param string $schema_id The `@id` to use for the returned image.
* @param int $attachment_id The attachment to retrieve data from.
* @param string $caption The caption string, if there is one.
* @param bool $add_hash Whether a hash will be added as a suffix in the @id.
*
* @return array Schema ImageObject array.
*/
public function generate_from_attachment_id( $schema_id, $attachment_id, $caption = '', $add_hash = false ) {
$data = $this->generate_object();
$url = $this->image->get_attachment_image_url( $attachment_id, 'full' );
$id_suffix = ( $add_hash ) ? \md5( $url ) : '';
$data['@id'] = $schema_id . $id_suffix;
$data['url'] = $url;
$data['contentUrl'] = $url;
$data = $this->add_image_size( $data, $attachment_id );
$data = $this->add_caption( $data, $attachment_id, $caption );
return $data;
}
/**
* Retrieve data about an image from the database and use it to generate a Schema object.
*
* @param string $schema_id The `@id` to use for the returned image.
* @param array $attachment_meta The attachment metadata.
* @param string $caption The caption string, if there is one.
* @param bool $add_hash Whether a hash will be added as a suffix in the @id.
*
* @return array Schema ImageObject array.
*/
public function generate_from_attachment_meta( $schema_id, $attachment_meta, $caption = '', $add_hash = false ) {
$data = $this->generate_object();
$id_suffix = ( $add_hash ) ? \md5( $attachment_meta['url'] ) : '';
$data['@id'] = $schema_id . $id_suffix;
$data['url'] = $attachment_meta['url'];
$data['contentUrl'] = $data['url'];
$data['width'] = $attachment_meta['width'];
$data['height'] = $attachment_meta['height'];
if ( ! empty( $caption ) ) {
$data['caption'] = $this->html->smart_strip_tags( $caption );
}
return $data;
}
/**
* If we can't find $url in our database, we output a simple ImageObject.
*
* @param string $schema_id The `@id` to use for the returned image.
* @param string $url The image URL.
* @param string $caption A caption, if set.
* @param bool $add_hash Whether a hash will be added as a suffix in the @id.
*
* @return array Schema ImageObject array.
*/
public function simple_image_object( $schema_id, $url, $caption = '', $add_hash = false ) {
$data = $this->generate_object();
$id_suffix = ( $add_hash ) ? \md5( $url ) : '';
$data['@id'] = $schema_id . $id_suffix;
$data['url'] = $url;
$data['contentUrl'] = $url;
if ( ! empty( $caption ) ) {
$data['caption'] = $this->html->smart_strip_tags( $caption );
}
return $data;
}
/**
* Retrieves an image's caption if set, or uses the alt tag if that's set.
*
* @param array $data An ImageObject Schema array.
* @param int $attachment_id Attachment ID.
* @param string $caption The caption string, if there is one.
*
* @return array An imageObject with width and height set if available.
*/
private function add_caption( $data, $attachment_id, $caption = '' ) {
if ( $caption !== '' ) {
$data['caption'] = $caption;
return $data;
}
$caption = $this->image->get_caption( $attachment_id );
if ( ! empty( $caption ) ) {
$data['caption'] = $this->html->smart_strip_tags( $caption );
return $data;
}
return $data;
}
/**
* Generates our bare bone ImageObject.
*
* @return array an empty ImageObject
*/
private function generate_object() {
$data = [
'@type' => 'ImageObject',
];
$data = $this->language->add_piece_language( $data );
return $data;
}
/**
* Adds image's width and height.
*
* @param array $data An ImageObject Schema array.
* @param int $attachment_id Attachment ID.
*
* @return array An imageObject with width and height set if available.
*/
private function add_image_size( $data, $attachment_id ) {
$image_meta = $this->image->get_metadata( $attachment_id );
if ( empty( $image_meta['width'] ) || empty( $image_meta['height'] ) ) {
return $data;
}
$data['width'] = $image_meta['width'];
$data['height'] = $image_meta['height'];
return $data;
}
}