wordpress-activitypub/includes/transformer/class-transformer-factory.php

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<?php
/**
* Inspired by the way elementor handles addons.
*
* @link https://github.com/elementor/elementor/
* @package Activitypub
*/
namespace Activitypub\Transformer;
use WP_Post;
use WP_Comment;
use function Activitypub\camel_to_snake_case;
use function Activitypub\snake_to_camel_case;
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly.
}
/**
* ActivityPub transformers manager.
*
* ActivityPub transformers manager handler class is responsible for registering and
* initializing all the supported WP-Pobject to ActivityPub transformers.
*
* @since version_number_transformer_management_placeholder
*/
class Transformer_Factory {
const DEFAULT_TRANSFORMER_MAPPING = array(
'post' => ACTIVITYPUB_DEFAULT_TRANSFORMER,
'page' => ACTIVITYPUB_DEFAULT_TRANSFORMER,
);
/**
* Transformers.
*
* Holds the list of all the ActivityPub transformers. Default is `null`.
*
* @since version_number_transformer_management_placeholder
* @access private
*
* @var \ActivityPub\Transformer\Base[]
*/
private $transformers = null;
/**
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* Transformer_Manager instance.
*
* Holds the transformer instance.
*
* @since version_number_transformer_management_placeholder
* @access protected
*
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* @var Transformer_Manager
*/
protected static $_instances = [];
/**
* Instance.
*
* Ensures only one instance of the transformer manager class is loaded or can be loaded.
*
* @since version_number_transformer_management_placeholder
* @access public
* @static
*
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* @return Transformer_Manager An instance of the class.
*/
public static function instance() {
$class_name = static::class_name();
if ( empty( static::$_instances[ $class_name ] ) ) {
static::$_instances[ $class_name ] = new static();
}
return static::$_instances[ $class_name ];
}
/**
* Class name.
*
* Retrieve the name of the class.
*
* @since version_number_transformer_management_placeholder
* @access public
* @static
*/
public static function class_name() {
return get_called_class();
}
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/**
* Transformers manager constructor.
*
* Initializing ActivityPub transformers manager.
*
* @since version_number_transformer_management_placeholder
* @access public
*/
public function __construct() {
$this->require_files();
}
/**
* Require files.
*
* Require ActivityPub transformer base class.
*
* @since version_number_transformer_management_placeholder
* @access private
*/
private function require_files() {
require ACTIVITYPUB_PLUGIN_DIR . 'includes/transformer/class-base.php';
}
/**
* Checks if a transformer is registered.
*
* @since version_number_transformer_management_placeholder
*
* @param string $name Transformer name including namespace.
* @return bool True if the block type is registered, false otherwise.
*/
public function is_registered( $name ) {
return isset( $this->transformers[ $name ] );
}
/**
* Register a transformer.
*
* @since version_number_transformer_management_placeholder
* @access public
*
* @param \ActivityPub\Transformer\Base $transformer_instance ActivityPub Transformer.
*
* @return bool True if the ActivityPub transformer was registered.
*/
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public function register( \ActivityPub\Transformer\Base $transformer_instance ) {
if ( ! $transformer_instance instanceof \ActivityPub\Transformer\Base ) {
_doing_it_wrong(
__METHOD__,
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\esc_html__( 'ActivityPub transformer instance must be a of \ActivityPub\Transformer_Base class.' ),
'version_number_transformer_management_placeholder'
);
return false;
}
$transformer_name = $transformer_instance->get_name();
if ( preg_match( '/[A-Z]+/', $transformer_name ) ) {
_doing_it_wrong(
__METHOD__,
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\esc_html__( 'ActivityPub transformer names must not contain uppercase characters.' ),
'version_number_transformer_management_placeholder'
);
return false;
}
$name_matcher = '/^[a-z0-9-]+\/[a-z0-9-]+$/';
if ( ! preg_match( $name_matcher, $transformer_name ) ) {
_doing_it_wrong(
__METHOD__,
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\esc_html__( 'ActivityPub transformer names must contain a namespace prefix. Example: my-plugin/my-custom-transformer' ),
'version_number_transformer_management_placeholder'
);
return false;
}
if ( $this->is_registered( $transformer_name ) ) {
_doing_it_wrong(
__METHOD__,
/* translators: %s: Block name. */
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sprintf( 'ActivityPub transformer with name "%s" is already registered.', esc_html( $transformer_name ) ),
'version_number_transformer_management_placeholder'
);
return false;
}
/**
* Should the ActivityPub transformer be registered.
*
* @since version_number_transformer_management_placeholder
*
* @param bool $should_register Should the ActivityPub transformer be registered. Default is `true`.
* @param \ActivityPub\Transformer\Base $transformer_instance Widget instance.
*/
// TODO: does not implementing this slow down the website? -> compare with gutenberg block registration.
// $should_register = apply_filters( 'activitypub/transformers/is_transformer_enabled', true, $transformer_instance );
// if ( ! $should_register ) {
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// return false;
// }
$this->transformers[ $transformer_name ] = $transformer_instance;
return true;
}
/**
* Init transformers.
*
* Initialize ActivityPub transformer manager.
* Include the builtin transformers by default and add third party ones.
*
* @since version_number_transformer_management_placeholder
* @access private
*/
private function init_transformers() {
$builtin_transformers = [
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'post',
];
$this->transformers = [];
foreach ( $builtin_transformers as $transformer_name ) {
$class_name = ucfirst( $transformer_name );
$class_name = '\Activitypub\Transformer\\' . $class_name;
$this->register( new $class_name() );
}
/**
* Let other transformers register.
*
* Fires after the built-in Activitypub transformers are registered.
*
* @since version_number_transformer_management_placeholder
*
* @param Transformer_Factory $this The widgets manager.
*/
do_action( 'activitypub_transformers_register', $this );
}
/**
* Get available ActivityPub transformers.
*
* Retrieve the registered transformers list. If given a transformer name
* it returns the given transformer if it is registered.
*
* @since version_number_transformer_management_placeholder
* @access public
*
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* @param string $transformer_name Optional. Transformer name. Default is null.
*
* @return Base|Base[]|null Registered transformers.
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*/
public function get_transformers( $transformer_name = null ) {
if ( is_null( $this->transformers ) ) {
$this->init_transformers();
}
if ( null !== $transformer_name ) {
return isset( $this->transformers[ $transformer_name ] ) ? $this->transformers[ $transformer_name ] : null;
}
return $this->transformers;
}
/**
* Get the mapped ActivityPub transformer.
*
* Returns a new instance of the needed WordPress to ActivityPub transformer.
*
* @since version_number_transformer_management_placeholder
* @access public
*
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* @param WP_Post|WP_Comment $wp_object The WordPress Post/Comment.
*
* @return \ActivityPub\Transformer\Base|null Registered transformers.
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*/
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public function transform( $wp_object ) {
switch ( get_class( $wp_object ) ) {
case 'WP_Post':
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$post_type = get_post_type( $wp_object );
$transformer_mapping = \get_option( 'activitypub_transformer_mapping', self::DEFAULT_TRANSFORMER_MAPPING );
$transformer_name = $transformer_mapping[ $post_type ];
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$transformer_class = $this->get_transformers( $transformer_name );
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if ( null === $transformer_class ) {
wp_die("transformer '". $transformer_name . "' not found", '', ["response" => 404]);
}
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$transformer_instance = new $transformer_class();
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$transformer_instance->set_wp_post( $wp_object );
return $transformer_instance->transform();
case 'WP_Comment':
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return new Comment( $wp_object );
default:
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return apply_filters( 'activitypub_transformer', null, $wp_object, get_class( $wp_object ) );
}
}
}