add support for threaded comments

README.md

@@ -3,7 +3,7 @@
 **Tags:** OStatus, fediverse, activitypub, activitystream  
 **Requires at least:** 4.7  
 **Tested up to:** 6.4  
-**Stable tag:** 1.2.0  
+**Stable tag:** 1.1.0  
 **Requires PHP:** 5.6  
 **License:** MIT  
 **License URI:** http://opensource.org/licenses/MIT  
@@ -105,15 +105,6 @@ Where 'blog' is the path to the subdirectory at which your blog resides.
 
 Project maintained on GitHub at [automattic/wordpress-activitypub](https://github.com/automattic/wordpress-activitypub).
 
-### 1.2.0 ###
-
-* Add: Search and order followerer lists
-* Add: Have a filter to defer signature verification
-* Improved: "Follow Me" styles for dark themes
-* Improved: Allow `p` and `br` tags only for AP comments
-* Fixed: Deduplicate attachments earlier to prevent incorrect max_media
-
-
 ### 1.1.0 ###
 
 * Improved: audio and video attachments are now supported!

activitypub.php

@@ -3,7 +3,7 @@
  * Plugin Name: ActivityPub
  * Plugin URI: https://github.com/pfefferle/wordpress-activitypub/
  * Description: The ActivityPub protocol is a decentralized social networking protocol based upon the ActivityStreams 2.0 data format.
- * Version: 1.2.0
+ * Version: 1.1.0
  * Author: Matthias Pfefferle & Automattic
  * Author URI: https://automattic.com/
  * License: MIT
@@ -33,15 +33,12 @@ require_once __DIR__ . '/includes/functions.php';
 \defined( 'ACTIVITYPUB_CUSTOM_POST_CONTENT' ) || \define( 'ACTIVITYPUB_CUSTOM_POST_CONTENT', "<strong>[ap_title]</strong>\n\n[ap_content]\n\n[ap_hashtags]\n\n[ap_shortlink]" );
 \defined( 'ACTIVITYPUB_AUTHORIZED_FETCH' ) || \define( 'ACTIVITYPUB_AUTHORIZED_FETCH', false );
 \defined( 'ACTIVITYPUB_DISABLE_REWRITES' ) || \define( 'ACTIVITYPUB_DISABLE_REWRITES', false );
-\defined( 'ACTIVITYPUB_DEFAULT_TRANSFORMER' ) || \define( 'ACTIVITYPUB_DEFAULT_TRANSFORMER', 'activitypub/default' );
-
 
 \define( 'ACTIVITYPUB_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 \define( 'ACTIVITYPUB_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );
 \define( 'ACTIVITYPUB_PLUGIN_FILE', plugin_dir_path( __FILE__ ) . '/' . basename( __FILE__ ) );
 \define( 'ACTIVITYPUB_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
 
-
 /**
  * Initialize REST routes.
  */
@@ -69,7 +66,7 @@ function plugin_init() {
 	\add_action( 'init', array( __NAMESPACE__ . '\Migration', 'init' ) );
 	\add_action( 'init', array( __NAMESPACE__ . '\Activitypub', 'init' ) );
 	\add_action( 'init', array( __NAMESPACE__ . '\Activity_Dispatcher', 'init' ) );
-	\add_action( 'init', array( __NAMESPACE__ . '\Collection\Followers', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Handler', 'init' ) );
 	\add_action( 'init', array( __NAMESPACE__ . '\Admin', 'init' ) );
 	\add_action( 'init', array( __NAMESPACE__ . '\Hashtag', 'init' ) );
 	\add_action( 'init', array( __NAMESPACE__ . '\Mention', 'init' ) );

composer.json

@@ -15,7 +15,8 @@
         "yoast/phpunit-polyfills": "^2.0",
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0.0",
         "sirbrillig/phpcs-variable-analysis": "^2.11",
-        "phpcsstandards/phpcsextra": "^1.1.0"
+        "phpcsstandards/phpcsextra": "^1.1.0",
+        "dms/phpunit-arraysubset-asserts": "^0.4.0"
     },
     "config": {
         "allow-plugins": true

includes/activity/class-activity.php

@@ -194,6 +194,12 @@ class Activity extends Base_Object {
 	 * @return void
 	 */
 	public function set_object( $object ) {
+		// convert array to object
+		if ( is_array( $object ) ) {
+			$object = Base_Object::init_from_array( $object );
+		}
+
+		// set object
 		$this->set( 'object', $object );
 
 		if ( ! is_object( $object ) ) {

includes/activity/class-base-object.php

@@ -585,7 +585,7 @@ class Base_Object {
 
 		foreach ( $array as $key => $value ) {
 			$key = camel_to_snake_case( $key );
-			$object->set( $key, $value );
+			call_user_func( array( $object, 'set_' . $key ), $value );
 		}
 
 		return $object;
@@ -611,7 +611,7 @@ class Base_Object {
 		foreach ( $array as $key => $value ) {
 			if ( $value ) {
 				$key = camel_to_snake_case( $key );
-				$this->set( $key, $value );
+				call_user_func( array( $this, 'set_' . $key ), $value );
 			}
 		}
 	}

includes/activity/class-event.php

@@ -1,23 +0,0 @@
-<?php
-/**
- * Inspired by the PHP ActivityPub Library by @Landrok
- *
- * @link https://github.com/landrok/activitypub
- */
-
-namespace Activitypub\Activity;
-
-use Activitypub\Activity\Base_Object;
-
-/**
- * Event is an implementation of one of the
- * Activity Streams Event object type
- *
- * The Object is the primary base type for the Activity Streams
- * vocabulary.
- *
- * @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-event
- */
-class Note extends Base_Object {
-	protected $type = 'Event';
-}

includes/activity/class-note.php

@@ -1,23 +0,0 @@
-<?php
-/**
- * Inspired by the PHP ActivityPub Library by @Landrok
- *
- * @link https://github.com/landrok/activitypub
- */
-
-namespace Activitypub\Activity;
-
-use Activitypub\Activity\Base_Object;
-
-/**
- * Note is an implementation of one of the
- * Activity Streams Note object type
- *
- * The Object is the primary base type for the Activity Streams
- * vocabulary.
- *
- * @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-note
- */
-class Note extends Base_Object {
-	protected $type = 'Note';
-}

includes/class-activity-dispatcher.php

@@ -5,7 +5,7 @@ use WP_Post;
 use Activitypub\Activity\Activity;
 use Activitypub\Collection\Users;
 use Activitypub\Collection\Followers;
-use Activitypub\Transformer\Transformers_Manager;
+use Activitypub\Transformer\Post;
 
 use function Activitypub\is_single_user;
 use function Activitypub\is_user_disabled;
@@ -65,8 +65,7 @@ class Activity_Dispatcher {
 			return;
 		}
 
-		$transformer = Transformers_Manager::instance()->get_transformer( $wp_post );
-		$object = $transformer->to_object();
+		$object = Post::transform( $wp_post )->to_object();
 
 		$activity = new Activity();
 		$activity->set_type( $type );
@@ -102,8 +101,7 @@ class Activity_Dispatcher {
 			return;
 		}
 
-		$transformer = Transformers_Manager::instance()->get_transformer( $wp_post );
-		$object = $transformer->to_object();
+		$object = Post::transform( $wp_post )->to_object();
 
 		$activity = new Activity();
 		$activity->set_type( 'Announce' );

includes/class-activitypub.php

@@ -1,8 +1,12 @@
 <?php
 namespace Activitypub;
 
+use Exception;
 use Activitypub\Signature;
 use Activitypub\Collection\Users;
+use Activitypub\Collection\Followers;
+
+use function Activitypub\sanitize_url;
 
 /**
  * ActivityPub Class
@@ -20,9 +24,9 @@ class Activitypub {
 		\add_filter( 'get_comment_link', array( self::class, 'remote_comment_link' ), 11, 3 );
 
 		// Add support for ActivityPub to custom post types
-		$transformer_mapping = \get_option( 'activitypub_transformer_mapping', array( 'post' => 'activitypub/default', 'page' => 'activitypub/default' ) ) ? \get_option( 'activitypub_transformer_mapping', array( 'post' => 'activitypub/default', 'page' => 'activitypub/default' ) ) : array();
+		$post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) ? \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) : array();
 
-		foreach ( array_keys( $transformer_mapping ) as $post_type ) {
+		foreach ( $post_types as $post_type ) {
 			\add_post_type_support( $post_type, 'activitypub' );
 		}
 
@@ -34,6 +38,9 @@ class Activitypub {
 		\add_action( 'after_setup_theme', array( self::class, 'theme_compat' ), 99 );
 
 		\add_action( 'in_plugin_update_message-' . ACTIVITYPUB_PLUGIN_BASENAME, array( self::class, 'plugin_update_message' ) );
+
+		// register several post_types
+		self::register_post_types();
 	}
 
 	/**
@@ -54,7 +61,6 @@ class Activitypub {
 	 */
 	public static function deactivate() {
 		self::flush_rewrite_rules();
-
 		Scheduler::deregister_schedules();
 	}
 
@@ -328,4 +334,80 @@ class Activitypub {
 			)
 		);
 	}
+
+	/**
+	 * Register the "Followers" Taxonomy
+	 *
+	 * @return void
+	 */
+	private static function register_post_types() {
+		register_post_type(
+			Followers::POST_TYPE,
+			array(
+				'labels'           => array(
+					'name'          => _x( 'Followers', 'post_type plural name', 'activitypub' ),
+					'singular_name' => _x( 'Follower', 'post_type single name', 'activitypub' ),
+				),
+				'public'           => false,
+				'hierarchical'     => false,
+				'rewrite'          => false,
+				'query_var'        => false,
+				'delete_with_user' => false,
+				'can_export'       => true,
+				'supports'         => array(),
+			)
+		);
+
+		register_post_meta(
+			Followers::POST_TYPE,
+			'activitypub_inbox',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => 'sanitize_url',
+			)
+		);
+
+		register_post_meta(
+			Followers::POST_TYPE,
+			'activitypub_errors',
+			array(
+				'type'              => 'string',
+				'single'            => false,
+				'sanitize_callback' => function( $value ) {
+					if ( ! is_string( $value ) ) {
+						throw new Exception( 'Error message is no valid string' );
+					}
+
+					return esc_sql( $value );
+				},
+			)
+		);
+
+		register_post_meta(
+			Followers::POST_TYPE,
+			'activitypub_user_id',
+			array(
+				'type'              => 'string',
+				'single'            => false,
+				'sanitize_callback' => function( $value ) {
+					return esc_sql( $value );
+				},
+			)
+		);
+
+		register_post_meta(
+			Followers::POST_TYPE,
+			'activitypub_actor_json',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => function( $value ) {
+					return sanitize_text_field( $value );
+				},
+			)
+		);
+
+		do_action( 'activitypub_after_register_post_type' );
+	}
 }

includes/class-admin.php

@@ -3,7 +3,6 @@ namespace Activitypub;
 
 use WP_User_Query;
 use Activitypub\Model\Blog_User;
-use Activitypub\Base\Transformer\Base as Transformer_Base;
 
 /**
  * ActivityPub Admin Class
@@ -23,15 +22,6 @@ class Admin {
 		if ( ! is_user_disabled( get_current_user_id() ) ) {
 			\add_action( 'show_user_profile', array( self::class, 'add_profile' ) );
 		}
-
-		add_filter(
-			'activitypub/transformers/is_transformer_enabled',
-			function( $should_register, Transformer_Base $transformer_instance ) {
-				return ! Options::is_transformer_disabled( $transformer_instance->get_name() );
-			},
-			10,
-			2
-		);
 	}
 
 	/**
@@ -164,47 +154,14 @@ class Admin {
 				'default' => '0',
 			)
 		);
-
-		/**
-		 * Flexible activation of post_types together with mapping ActivityPub transformers.
-		 *
-		 * If a post-type is not mapped to any ActivtiyPub transformer it means it is not activated
-		 * for ActivityPub federation.
-		 *
-		 * @since version_number_transformer_management_placeholder
-		 */
-		register_setting(
+		\register_setting(
 			'activitypub',
-			'activitypub_transformer_mapping',
+			'activitypub_support_post_types',
 			array(
-				'type'         => 'array',
-				'default'      => array(
-					'post' => 'note',
-				),
-				'show_in_rest' => array(
-					'schema' => array(
-						'type'  => 'array',
-						'items' => array(
-							'type' => 'string',
-						),
-					),
-				),
-				'sanitize_callback' => function ( $value ) {
-					// Check if $value is an array
-					if ( ! is_array( $value ) ) {
-						return array();
-					}
-					$value_keys = array_keys( $value );
-
-					$all_public_post_types = \get_post_types( array( 'public' => true ), 'names' );
-
-					// Unset the keys that are missing in $keysToCheck
-					foreach ( array_diff( $value_keys, $all_public_post_types ) as $missing_key ) {
-						unset( $value[ $missing_key ] );
-					}
-					// var_dump($value);
-					return $value;
-				},
+				'type'         => 'string',
+				'description'  => \esc_html__( 'Enable ActivityPub support for post types', 'activitypub' ),
+				'show_in_rest' => true,
+				'default'      => array( 'post', 'pages' ),
 			)
 		);
 		\register_setting(

includes/class-handler.php

@@ -0,0 +1,33 @@
+<?php
+namespace Activitypub;
+
+use Activitypub\Handler\Create;
+use Activitypub\Handler\Delete;
+use Activitypub\Handler\Follow;
+use Activitypub\Handler\Undo;
+use Activitypub\Handler\Update;
+
+/**
+ * Handler class.
+ */
+class Handler {
+	/**
+	 * Initialize the class, registering WordPress hooks
+	 */
+	public static function init() {
+		self::register_handlers();
+	}
+
+	/**
+	 * Register handlers.
+	 */
+	public static function register_handlers() {
+		Create::init();
+		Delete::init();
+		Follow::init();
+		Undo::init();
+		Update::init();
+
+		do_action( 'activitypub_register_handlers' );
+	}
+}

includes/class-migration.php

@@ -4,7 +4,6 @@ namespace Activitypub;
 use Activitypub\Activitypub;
 use Activitypub\Model\Blog_User;
 use Activitypub\Collection\Followers;
-use Activitypub\Admin;
 
 /**
  * ActivityPub Migration Class
@@ -115,30 +114,12 @@ class Migration {
 		if ( version_compare( $version_from_db, '1.0.0', '<' ) ) {
 			self::migrate_from_0_17();
 		}
-		if ( version_compare( $version_from_db, 'version_number_transformer_management_placeholder', '<' ) ) {
-			self::migrate_from_version_number_transformer_management_placeholder();
-		}
 
 		update_option( 'activitypub_db_version', self::get_target_version() );
 
 		self::unlock();
 	}
 
-	/**
-	 * Updates the supported post type settings to the mapped transformer setting.
-	 * TODO: Test this
-	 * @return void
-	 */
-	private static function migrate_from_version_number_transformer_management_placeholder() {
-		$supported_post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) );
-		Admin::register_settings();
-		$transformer_mapping = array();
-		foreach ( $supported_post_types as $supported_post_type ) {
-			$transformer_mapping[ $supported_post_type ] = ACTIVITYPUB_DEFAULT_TRANSFORMER;
-		}
-		update_option( 'activitypub_transformer_mapping', $transformer_mapping );
-	}
-
 	/**
 	 * Updates the DB-schema of the followers-list
 	 *

includes/class-scheduler.php

@@ -4,6 +4,7 @@ namespace Activitypub;
 
 use Activitypub\Collection\Users;
 use Activitypub\Collection\Followers;
+use Activitypub\Transformer\Post;
 
 /**
  * ActivityPub Scheduler Class

includes/class-webfinger.php

@@ -41,14 +41,9 @@ class Webfinger {
 	 * @return string|WP_Error The URL or WP_Error
 	 */
 	public static function resolve( $resource ) {
-		if ( ! $resource ) {
-			return null;
-		}
-
 		if ( ! preg_match( '/^@?' . ACTIVITYPUB_USERNAME_REGEXP . '$/i', $resource, $m ) ) {
 			return null;
 		}
-
 		$transient_key = 'activitypub_resolve_' . ltrim( $resource, '@' );
 
 		$link = \get_transient( $transient_key );

includes/collection/class-followers.php

@@ -2,14 +2,10 @@
 namespace Activitypub\Collection;
 
 use WP_Error;
-use Exception;
 use WP_Query;
 use Activitypub\Http;
 use Activitypub\Webfinger;
 use Activitypub\Model\Follower;
-use Activitypub\Collection\Users;
-use Activitypub\Activity\Activity;
-use Activitypub\Activity\Base_Object;
 
 use function Activitypub\is_tombstone;
 use function Activitypub\get_remote_metadata_by_actor;
@@ -24,136 +20,6 @@ class Followers {
 	const POST_TYPE = 'ap_follower';
 	const CACHE_KEY_INBOXES = 'follower_inboxes_%s';
 
-	/**
-	 * Register WordPress hooks/actions and register Taxonomy
-	 *
-	 * @return void
-	 */
-	public static function init() {
-		// register "followers" post_type
-		self::register_post_type();
-
-		\add_action( 'activitypub_inbox_follow', array( self::class, 'handle_follow_request' ), 10, 2 );
-		\add_action( 'activitypub_inbox_undo', array( self::class, 'handle_undo_request' ), 10, 2 );
-
-		\add_action( 'activitypub_followers_post_follow', array( self::class, 'send_follow_response' ), 10, 4 );
-	}
-
-	/**
-	 * Register the "Followers" Taxonomy
-	 *
-	 * @return void
-	 */
-	private static function register_post_type() {
-		register_post_type(
-			self::POST_TYPE,
-			array(
-				'labels'           => array(
-					'name'          => _x( 'Followers', 'post_type plural name', 'activitypub' ),
-					'singular_name' => _x( 'Follower', 'post_type single name', 'activitypub' ),
-				),
-				'public'           => false,
-				'hierarchical'     => false,
-				'rewrite'          => false,
-				'query_var'        => false,
-				'delete_with_user' => false,
-				'can_export'       => true,
-				'supports'         => array(),
-			)
-		);
-
-		register_post_meta(
-			self::POST_TYPE,
-			'activitypub_inbox',
-			array(
-				'type'              => 'string',
-				'single'            => true,
-				'sanitize_callback' => array( self::class, 'sanitize_url' ),
-			)
-		);
-
-		register_post_meta(
-			self::POST_TYPE,
-			'activitypub_errors',
-			array(
-				'type'              => 'string',
-				'single'            => false,
-				'sanitize_callback' => function( $value ) {
-					if ( ! is_string( $value ) ) {
-						throw new Exception( 'Error message is no valid string' );
-					}
-
-					return esc_sql( $value );
-				},
-			)
-		);
-
-		register_post_meta(
-			self::POST_TYPE,
-			'activitypub_user_id',
-			array(
-				'type'              => 'string',
-				'single'            => false,
-				'sanitize_callback' => function( $value ) {
-					return esc_sql( $value );
-				},
-			)
-		);
-
-		register_post_meta(
-			self::POST_TYPE,
-			'activitypub_actor_json',
-			array(
-				'type'              => 'string',
-				'single'            => true,
-				'sanitize_callback' => function( $value ) {
-					return sanitize_text_field( $value );
-				},
-			)
-		);
-
-		do_action( 'activitypub_after_register_post_type' );
-	}
-
-	public static function sanitize_url( $value ) {
-		if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
-			return null;
-		}
-
-		return esc_url_raw( $value );
-	}
-
-	/**
-	 * Handle the "Follow" Request
-	 *
-	 * @param array $object    The JSON "Follow" Activity
-	 * @param int   $user_id The ID of the ID of the WordPress User
-	 *
-	 * @return void
-	 */
-	public static function handle_follow_request( $object, $user_id ) {
-		// save follower
-		$follower = self::add_follower( $user_id, $object['actor'] );
-
-		do_action( 'activitypub_followers_post_follow', $object['actor'], $object, $user_id, $follower );
-	}
-
-	/**
-	 * Handle "Unfollow" requests
-	 *
-	 * @param array $object  The JSON "Undo" Activity
-	 * @param int   $user_id The ID of the ID of the WordPress User
-	 */
-	public static function handle_undo_request( $object, $user_id ) {
-		if (
-			isset( $object['object'] ) &&
-			isset( $object['object']['type'] ) &&
-			'Follow' === $object['object']['type']
-		) {
-			self::remove_follower( $user_id, $object['actor'] );
-		}
-	}
-
 	/**
 	 * Add new Follower
 	 *
@@ -243,54 +109,6 @@ class Followers {
 		return null;
 	}
 
-	/**
-	 * Send Accept response
-	 *
-	 * @param string                     $actor    The Actor URL
-	 * @param array                      $object   The Activity object
-	 * @param int                        $user_id  The ID of the WordPress User
-	 * @param Activitypub\Model\Follower $follower The Follower object
-	 *
-	 * @return void
-	 */
-	public static function send_follow_response( $actor, $object, $user_id, $follower ) {
-		if ( is_wp_error( $follower ) ) {
-			// it is not even possible to send a "Reject" because
-			// we can not get the Remote-Inbox
-			return;
-		}
-
-		// only send minimal data
-		$object = array_intersect_key(
-			$object,
-			array_flip(
-				array(
-					'id',
-					'type',
-					'actor',
-					'object',
-				)
-			)
-		);
-
-		$user = Users::get_by_id( $user_id );
-
-		// get inbox
-		$inbox = $follower->get_shared_inbox();
-
-		// send "Accept" activity
-		$activity = new Activity();
-		$activity->set_type( 'Accept' );
-		$activity->set_object( $object );
-		$activity->set_actor( $user->get_id() );
-		$activity->set_to( $actor );
-		$activity->set_id( $user->get_id() . '#follow-' . \preg_replace( '~^https?://~', '', $actor ) . '-' . \time() );
-
-		$activity = $activity->to_json();
-
-		Http::post( $inbox, $activity, $user_id );
-	}
-
 	/**
 	 * Get the Followers of a given user
 	 *

includes/collection/class-interactions.php

@@ -0,0 +1,133 @@
+<?php
+namespace Activitypub\Collection;
+
+use WP_Error;
+
+use function Activitypub\object_id_to_comment;
+use function Activitypub\get_remote_metadata_by_actor;
+
+/**
+ * ActivityPub Interactions Collection
+ */
+class Interactions {
+	/**
+	 * Add a comment to a post
+	 *
+	 * @param array $activity The activity-object
+	 *
+	 * @return array|false The commentdata or false on failure
+	 */
+	public static function add_comment( $activity ) {
+		if (
+			! isset( $activity['object'] ) ||
+			! isset( $activity['object']['id'] )
+		) {
+			return new WP_Error(
+				'activitypub_no_valid_object',
+				__( 'No object id found.', 'activitypub' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		if ( ! isset( $activity['object']['inReplyTo'] ) ) {
+			return new WP_Error(
+				'activitypub_no_reply',
+				__( 'Object is no reply.', 'activitypub' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		$in_reply_to     = \esc_url_raw( $activity['object']['inReplyTo'] );
+		$comment_post_id = \url_to_postid( $in_reply_to );
+		$parent_comment  = object_id_to_comment( $in_reply_to );
+
+		// save only replys and reactions
+		if ( ! $comment_post_id && $parent_comment ) {
+			$comment_post_id = $parent_comment->comment_post_ID;
+		}
+
+		// not a reply to a post or comment
+		if ( ! $comment_post_id ) {
+			return new WP_Error(
+				'activitypub_no_reply',
+				__( 'Object is no reply.', 'activitypub' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		$meta = get_remote_metadata_by_actor( $activity['actor'] );
+
+		if ( ! $meta || \is_wp_error( $meta ) ) {
+			return new WP_Error(
+				'activitypub_invalid_follower',
+				__( 'Invalid Follower', 'activitypub' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		$commentdata = array(
+			'comment_post_ID' => $comment_post_id,
+			'comment_author' => \esc_attr( $meta['name'] ),
+			'comment_author_url' => \esc_url_raw( $meta['url'] ),
+			'comment_content' => addslashes( \wp_kses( $activity['object']['content'], 'pre_comment_content' ) ),
+			'comment_type' => 'comment',
+			'comment_author_email' => '',
+			'comment_parent' => $parent_comment ? $parent_comment->comment_ID : 0,
+			'comment_meta' => array(
+				'source_id'  => \esc_url_raw( $activity['object']['id'] ),
+				'source_url' => \esc_url_raw( $activity['object']['url'] ),
+				'avatar_url' => \esc_url_raw( $meta['icon']['url'] ),
+				'protocol'   => 'activitypub',
+			),
+		);
+
+		// disable flood control
+		\remove_action( 'check_comment_flood', 'check_comment_flood_db', 10 );
+
+		// do not require email for AP entries
+		\add_filter( 'pre_option_require_name_email', '__return_false' );
+		// No nonce possible for this submission route
+		\add_filter(
+			'akismet_comment_nonce',
+			function() {
+				return 'inactive';
+			}
+		);
+		\add_filter( 'wp_kses_allowed_html', array( self::class, 'allowed_comment_html' ), 10, 2 );
+
+		$comment = \wp_new_comment( $commentdata, true );
+
+		\remove_filter( 'wp_kses_allowed_html', array( self::class, 'allowed_comment_html' ), 10 );
+		\remove_filter( 'pre_option_require_name_email', '__return_false' );
+
+		// re-add flood control
+		\add_action( 'check_comment_flood', 'check_comment_flood_db', 10, 4 );
+
+		return $comment;
+	}
+
+	/**
+	 * Adds line breaks to the list of allowed comment tags.
+	 *
+	 * @param  array  $allowedtags Allowed HTML tags.
+	 * @param  string $context     Context.
+	 * @return array               Filtered tag list.
+	 */
+	public static function allowed_comment_html( $allowedtags, $context = '' ) {
+		if ( 'pre_comment_content' !== $context ) {
+			// Do nothing.
+			return $allowedtags;
+		}
+
+		// Add `p` and `br` to the list of allowed tags.
+		if ( ! array_key_exists( 'br', $allowedtags ) ) {
+			$allowedtags['br'] = array();
+		}
+
+		if ( ! array_key_exists( 'p', $allowedtags ) ) {
+			$allowedtags['p'] = array();
+		}
+
+		return $allowedtags;
+	}
+}

includes/functions.php

@@ -2,6 +2,7 @@
 namespace Activitypub;
 
 use WP_Error;
+use WP_Comment_Query;
 use Activitypub\Http;
 use Activitypub\Activity\Activity;
 use Activitypub\Collection\Followers;
@@ -279,16 +280,6 @@ function is_activitypub_request() {
 		return false;
 	}
 
-	// Check if the current post type supports ActivityPub.
-	if ( \is_singular() ) {
-		$queried_object = \get_queried_object();
-		$post_type      = \get_post_type( $queried_object );
-
-		if ( ! \post_type_supports( $post_type, 'activitypub' ) ) {
-			return false;
-		}
-	}
-
 	// One can trigger an ActivityPub request by adding ?activitypub to the URL.
 	// phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.VariableRedeclaration
 	global $wp_query;
@@ -486,6 +477,81 @@ function is_blog_public() {
 	return (bool) apply_filters( 'activitypub_is_blog_public', \get_option( 'blog_public', 1 ) );
 }
 
+/**
+ * Sanitize a URL
+ *
+ * @param string $value The URL to sanitize
+ *
+ * @return string|null The sanitized URL or null if invalid
+ */
+function sanitize_url( $value ) {
+	if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
+		return null;
+	}
+
+	return esc_url_raw( $value );
+}
+
+/**
+ * Extract recipient URLs from Activity object
+ *
+ * @param array $data
+ *
+ * @return array The list of user URLs
+ */
+function extract_recipients_from_activity( $data ) {
+	$recipient_items = array();
+
+	foreach ( array( 'to', 'bto', 'cc', 'bcc', 'audience' ) as $i ) {
+		if ( array_key_exists( $i, $data ) ) {
+			if ( is_array( $data[ $i ] ) ) {
+				$recipient = $data[ $i ];
+			} else {
+				$recipient = array( $data[ $i ] );
+			}
+			$recipient_items = array_merge( $recipient_items, $recipient );
+		}
+
+		if ( is_array( $data['object'] ) && array_key_exists( $i, $data['object'] ) ) {
+			if ( is_array( $data['object'][ $i ] ) ) {
+				$recipient = $data['object'][ $i ];
+			} else {
+				$recipient = array( $data['object'][ $i ] );
+			}
+			$recipient_items = array_merge( $recipient_items, $recipient );
+		}
+	}
+
+	$recipients = array();
+
+	// flatten array
+	foreach ( $recipient_items as $recipient ) {
+		if ( is_array( $recipient ) ) {
+			// check if recipient is an object
+			if ( array_key_exists( 'id', $recipient ) ) {
+				$recipients[] = $recipient['id'];
+			}
+		} else {
+			$recipients[] = $recipient;
+		}
+	}
+
+	return array_unique( $recipients );
+}
+
+/**
+ * Check if passed Activity is Public
+ *
+ * @param array $data The Activity object as array
+ *
+ * @return boolean True if public, false if not
+ */
+function is_activity_public( $data ) {
+	$recipients = extract_recipients_from_activity( $data );
+
+	return in_array( 'https://www.w3.org/ns/activitystreams#Public', $recipients, true );
+}
+
 /**
  * Get active users based on a given duration
  *
@@ -557,3 +623,29 @@ function get_total_users() {
 
 	return $users + 1;
 }
+
+/**
+ * Examine a comment ID and look up an existing comment it represents.
+ *
+ * @param string $id ActivityPub object ID (usually a URL) to check.
+ *
+ * @return int|boolean Comment ID, or false on failure.
+ */
+function object_id_to_comment( $id ) {
+	$comment_query = new WP_Comment_Query(
+		array(
+			'meta_key'   => 'source_id', // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
+			'meta_value' => $id,         // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
+		)
+	);
+
+	if ( ! $comment_query->comments ) {
+		return false;
+	}
+
+	if ( count( $comment_query->comments ) > 1 ) {
+		return false;
+	}
+
+	return $comment_query->comments[0];
+}

includes/handler/class-create.php

@@ -0,0 +1,73 @@
+<?php
+namespace Activitypub\Handler;
+
+use WP_Error;
+use Activitypub\Collection\Interactions;
+
+use function Activitypub\is_activity_public;
+use function Activitypub\object_id_to_comment;
+
+/**
+ * Handle Create requests
+ */
+class Create {
+	/**
+	 * Initialize the class, registering WordPress hooks
+	 */
+	public static function init() {
+		\add_action( 'activitypub_inbox_create', array( self::class, 'handle_create' ), 10, 3 );
+	}
+
+	/**
+	 * Handles "Create" requests
+	 *
+	 * @param array                $array   The activity-object
+	 * @param int                  $user_id The id of the local blog-user
+	 * @param Activitypub\Activity $object  The activity object
+	 *
+	 * @return void|WP_Error WP_Error on failure
+	 */
+	public static function handle_create( $array, $user_id, $object = null ) {
+		if (
+			! isset( $array['object'] ) ||
+			! isset( $array['object']['id'] )
+		) {
+			return new WP_Error(
+				'activitypub_no_valid_object',
+				__( 'No object id found.', 'activitypub' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		// check if Activity is public or not
+		if ( ! is_activity_public( $array ) ) {
+			// @todo maybe send email
+			return new WP_Error(
+				'activitypub_activity_not_public',
+				__( 'Activity is not public.', 'activitypub' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		$check_dupe = object_id_to_comment( $array['object']['id'] );
+
+		// if comment exists, call update action
+		if ( $check_dupe ) {
+			\do_action( 'activitypub_inbox_update', $array, $user_id, $object );
+			return new WP_Error(
+				'activitypub_comment_exists',
+				__( 'Comment already exists, initiated Update process.', 'activitypub' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		$reaction = Interactions::add_comment( $array );
+		$state    = null;
+
+		if ( $reaction ) {
+			$state = $reaction['comment_ID'];
+		}
+
+		\do_action( 'activitypub_handled_create', $array, $user_id, $state, $reaction );
+	}
+}

includes/handler/class-delete.php

@@ -0,0 +1,64 @@
+<?php
+namespace Activitypub\Handler;
+
+use Activitypub\Collection\Followers;
+
+/**
+ * Handles Delete requests.
+ */
+class Delete {
+	/**
+	 * Initialize the class, registering WordPress hooks
+	 */
+	public static function init() {
+		\add_action( 'activitypub_inbox_delete', array( self::class, 'handle_delete' ), 10, 2 );
+		//
+	}
+
+	/**
+	 * Handles "Delete" requests.
+	 *
+	 * @param array $activity The delete activity.
+	 * @param int   $user_id  The ID of the user performing the delete activity.
+	 */
+	public function handle_delete( $activity, $user_id ) {
+		if (
+			! isset( $activity['object'] ) ||
+			! is_array( $activity['object'] ) ||
+			! isset( $activity['object']['id'] )
+		) {
+			return;
+		}
+
+		$object_type = isset( $activity['object']['type'] ) ? $activity['object']['type'] : '';
+
+		switch ( $object_type ) {
+			case 'Person':
+			case 'Group':
+			case 'Organization':
+			case 'Service':
+			case 'Application':
+				$follower = Followers::get_follower( $user_id, $activity['actor'] );
+				if ( $follower ) {
+					$follower->delete();
+				}
+
+				// delete all activities from this user.
+
+				break;
+			case 'Tombstone':
+				// Handle tombstone.
+				break;
+			case 'Note':
+			case 'Article':
+			case 'Image':
+			case 'Audio':
+			case 'Video':
+			case 'Event':
+			case 'Document':
+			default:
+				// Handle delete activity for other object types.
+				break;
+		}
+	}
+}

includes/handler/class-follow.php

@@ -0,0 +1,81 @@
+<?php
+namespace Activitypub\Handler;
+
+use Activitypub\Http;
+use Activitypub\Collection\Users;
+use Activitypub\Activity\Activity;
+use Activitypub\Collection\Followers;
+
+/**
+ * Handle Follow requests
+ */
+class Follow {
+	/**
+	 * Initialize the class, registering WordPress hooks
+	 */
+	public static function init() {
+		\add_action( 'activitypub_inbox_follow', array( self::class, 'handle_follow_request' ), 10, 2 );
+		\add_action( 'activitypub_followers_post_follow', array( self::class, 'send_follow_response' ), 10, 4 );
+	}
+
+	/**
+	 * Handle "Follow" requests
+	 *
+	 * @param array $activity The activity object
+	 * @param int   $user_id  The user ID
+	 */
+	public function handle_follow( $activity, $user_id ) {
+		// save follower
+		$follower = Followers::add_follower( $user_id, $activity['actor'] );
+
+		do_action( 'activitypub_followers_post_follow', $activity['actor'], $activity, $user_id, $follower );
+	}
+
+	/**
+	 * Send Accept response
+	 *
+	 * @param string                     $actor    The Actor URL
+	 * @param array                      $object   The Activity object
+	 * @param int                        $user_id  The ID of the WordPress User
+	 * @param Activitypub\Model\Follower $follower The Follower object
+	 *
+	 * @return void
+	 */
+	public static function send_follow_response( $actor, $object, $user_id, $follower ) {
+		if ( \is_wp_error( $follower ) ) {
+			// it is not even possible to send a "Reject" because
+			// we can not get the Remote-Inbox
+			return;
+		}
+
+		// only send minimal data
+		$object = array_intersect_key(
+			$object,
+			array_flip(
+				array(
+					'id',
+					'type',
+					'actor',
+					'object',
+				)
+			)
+		);
+
+		$user = Users::get_by_id( $user_id );
+
+		// get inbox
+		$inbox = $follower->get_shared_inbox();
+
+		// send "Accept" activity
+		$activity = new Activity();
+		$activity->set_type( 'Accept' );
+		$activity->set_object( $object );
+		$activity->set_actor( $user->get_id() );
+		$activity->set_to( $actor );
+		$activity->set_id( $user->get_id() . '#follow-' . \preg_replace( '~^https?://~', '', $actor ) . '-' . \time() );
+
+		$activity = $activity->to_json();
+
+		Http::post( $inbox, $activity, $user_id );
+	}
+}

includes/handler/class-undo.php

@@ -0,0 +1,33 @@
+<?php
+namespace Activitypub\Handler;
+
+use Activitypub\Collection\Followers;
+
+/**
+ * Handle Undo requests
+ */
+class Undo {
+	/**
+	 * Initialize the class, registering WordPress hooks
+	 */
+	public static function init() {
+		\add_action( 'activitypub_inbox_undo', array( self::class, 'handle_undo' ), 10, 2 );
+	}
+
+	/**
+	 * Handle "Unfollow" requests
+	 *
+	 * @param array $activity The JSON "Undo" Activity
+	 * @param int   $user_id  The ID of the ID of the WordPress User
+	 */
+	public static function handle_undo( $activity, $user_id ) {
+		if (
+			isset( $activity['object'] ) &&
+			isset( $activity['actor'] ) &&
+			isset( $activity['object']['type'] ) &&
+			'Follow' === $activity['object']['type']
+		) {
+			Followers::remove_follower( $user_id, $activity['actor'] );
+		}
+	}
+}

includes/handler/class-update.php

@@ -0,0 +1,45 @@
+<?php
+namespace Activitypub\Handler;
+
+use WP_Error;
+use WP_REST_Request;
+use WP_REST_Response;
+
+/**
+ * Handle Update requests.
+ */
+class Update {
+	/**
+	 * Initialize the class, registering WordPress hooks
+	 */
+	public static function init() {
+		\add_action( 'activitypub_inbox_update', array( self::class, 'handle_update' ), 10 );
+	}
+
+	/**
+	 * Handle "Update" requests
+	 *
+	 * @param array $activity The JSON "Undo" Activity
+	 */
+	public static function handle_update( $activity ) {
+		// Get the post object.
+		$post = null;
+
+		// Check if the post exists.
+		if ( ! $post ) {
+			return new WP_Error( 'activitypub_post_not_found', __( 'Post not found.', 'activitypub' ), array( 'status' => 404 ) );
+		}
+
+		// Check if the user has permission to edit the post.
+		if ( ! \current_user_can( 'edit_post', $post->ID ) ) {
+			return new WP_Error( 'activitypub_permission_denied', __( 'You do not have permission to edit this post.', 'activitypub' ), array( 'status' => 403 ) );
+		}
+
+		// Update the post content.
+		$post_data = array(
+			'ID'           => $post->ID,
+			'post_content' => $activity['object']['content'],
+		);
+		wp_update_post( $post_data );
+	}
+}

includes/model/class-follower.php

@@ -315,7 +315,7 @@ class Follower extends Actor {
 		$object->set_id( $post->guid );
 		$object->set_name( $post->post_title );
 		$object->set_summary( $post->post_excerpt );
-		$object->set_published( gmdate( 'Y-m-d H:i:s', strtotime( $post->post_date ) ) );
+		$object->set_published( gmdate( 'Y-m-d H:i:s', strtotime( $post->post_published ) ) );
 		$object->set_updated( gmdate( 'Y-m-d H:i:s', strtotime( $post->post_modified ) ) );
 
 		return $object;

includes/model/class-post.php

@@ -1,7 +1,7 @@
 <?php
 namespace Activitypub\Model;
 
-use Activitypub\Transformer\Post as Transformer_Post;
+use Activitypub\Transformer\Post as Post_Transformer;
 
 /**
  * ActivityPub Post Class
@@ -33,9 +33,8 @@ class Post {
 	public function __construct( $post, $post_author = null ) {
 		_deprecated_function( __CLASS__, '1.0.0', '\Activitypub\Transformer\Post' );
 
-		$this->post = $post;
-		$transformer = new Transformer_Post();
-		$this->object = $transformer->set_wp_post( $post )->to_object();
+		$this->post   = $post;
+		$this->object = Post_Transformer::transform( $post )->to_object();
 	}
 
 	/**

includes/rest/class-collection.php

@@ -4,7 +4,7 @@ namespace Activitypub\Rest;
 use WP_Error;
 use WP_REST_Server;
 use WP_REST_Response;
-use Activitypub\Transformer\Transformers_Manager;
+use Activitypub\Transformer\Post;
 use Activitypub\Activity\Activity;
 use Activitypub\Collection\Users as User_Collection;
 
@@ -168,7 +168,7 @@ class Collection {
 		);
 
 		foreach ( $posts as $post ) {
-			$response['orderedItems'][] = Transformers_Manager::instance()->get_transformer( $post )->to_object()->to_array();
+			$response['orderedItems'][] = Post::transform( $post )->to_object()->to_array();
 		}
 
 		$rest_response = new WP_REST_Response( $response, 200 );

includes/rest/class-inbox.php

@@ -11,6 +11,7 @@ use function Activitypub\get_context;
 use function Activitypub\url_to_authorid;
 use function Activitypub\get_rest_url_by_path;
 use function Activitypub\get_remote_metadata_by_actor;
+use function Activitypub\extract_recipients_from_activity;
 
 /**
  * ActivityPub Inbox REST-Class
@@ -130,12 +131,13 @@ class Inbox {
 			return $user;
 		}
 
-		$data = $request->get_json_params();
-		$type = $request->get_param( 'type' );
-		$type = \strtolower( $type );
+		$data     = $request->get_json_params();
+		$activity = Activity::init_from_array( $data );
+		$type     = $request->get_param( 'type' );
+		$type     = \strtolower( $type );
 
-		\do_action( 'activitypub_inbox', $data, $user->get__id(), $type );
-		\do_action( "activitypub_inbox_{$type}", $data, $user->get__id() );
+		\do_action( 'activitypub_inbox', $data, $user->get__id(), $type, $activity );
+		\do_action( "activitypub_inbox_{$type}", $data, $user->get__id(), $activity );
 
 		$rest_response = new WP_REST_Response( array(), 202 );
 		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
@@ -151,9 +153,10 @@ class Inbox {
 	 * @return WP_REST_Response
 	 */
 	public static function shared_inbox_post( $request ) {
-		$data = $request->get_json_params();
-		$type = $request->get_param( 'type' );
-		$users = self::extract_recipients( $data );
+		$data     = $request->get_json_params();
+		$activity = Activity::init_from_array( $data );
+		$type     = $request->get_param( 'type' );
+		$users    = self::get_recipients( $data );
 
 		if ( ! $users ) {
 			return new WP_Error(
@@ -181,8 +184,8 @@ class Inbox {
 
 			$type = \strtolower( $type );
 
-			\do_action( 'activitypub_inbox', $data, $user->ID, $type );
-			\do_action( "activitypub_inbox_{$type}", $data, $user->ID );
+			\do_action( 'activitypub_inbox', $data, $user->ID, $type, $activity );
+			\do_action( "activitypub_inbox_{$type}", $data, $user->ID, $activity );
 		}
 
 		$rest_response = new WP_REST_Response( array(), 202 );
@@ -236,12 +239,8 @@ class Inbox {
 		$params['actor'] = array(
 			'required' => true,
 			'sanitize_callback' => function( $param, $request, $key ) {
-				if ( \is_array( $param ) ) {
-					if ( isset( $param['id'] ) ) {
-						$param = $param['id'];
-					} else {
-						$param = $param['url'];
-					}
+				if ( ! \is_string( $param ) ) {
+					$param = $param['id'];
 				}
 				return \esc_url_raw( $param );
 			},
@@ -340,121 +339,6 @@ class Inbox {
 		return $params;
 	}
 
-	/**
-	 * Handles "Create" requests
-	 *
-	 * @param  array $object  The activity-object
-	 * @param  int   $user_id The id of the local blog-user
-	 */
-	public static function handle_create( $object, $user_id ) {
-		$meta = get_remote_metadata_by_actor( $object['actor'] );
-
-		if ( ! isset( $object['object']['inReplyTo'] ) ) {
-			return;
-		}
-
-		// check if Activity is public or not
-		if ( ! self::is_activity_public( $object ) ) {
-			// @todo maybe send email
-			return;
-		}
-
-		$comment_post_id = \url_to_postid( $object['object']['inReplyTo'] );
-
-		// save only replys and reactions
-		if ( ! $comment_post_id ) {
-			return false;
-		}
-
-		$commentdata = array(
-			'comment_post_ID' => $comment_post_id,
-			'comment_author' => \esc_attr( $meta['name'] ),
-			'comment_author_url' => \esc_url_raw( $object['actor'] ),
-			'comment_content' => addslashes( \wp_kses( $object['object']['content'], 'pre_comment_content' ) ),
-			'comment_type' => 'comment',
-			'comment_author_email' => '',
-			'comment_parent' => 0,
-			'comment_meta' => array(
-				'source_url' => \esc_url_raw( $object['object']['url'] ),
-				'avatar_url' => \esc_url_raw( $meta['icon']['url'] ),
-				'protocol' => 'activitypub',
-			),
-		);
-
-		// disable flood control
-		\remove_action( 'check_comment_flood', 'check_comment_flood_db', 10 );
-
-		// do not require email for AP entries
-		\add_filter( 'pre_option_require_name_email', '__return_false' );
-
-		// No nonce possible for this submission route
-		\add_filter(
-			'akismet_comment_nonce',
-			function() {
-				return 'inactive';
-			}
-		);
-
-		\add_filter( 'wp_kses_allowed_html', array( self::class, 'allowed_comment_html' ), 10, 2 );
-
-		$state = \wp_new_comment( $commentdata, true );
-
-		\remove_filter( 'wp_kses_allowed_html', array( self::class, 'allowed_comment_html' ) );
-		\remove_filter( 'pre_option_require_name_email', '__return_false' );
-
-		// re-add flood control
-		\add_action( 'check_comment_flood', 'check_comment_flood_db', 10, 4 );
-
-		do_action( 'activitypub_handled_create', $object, $user_id, $state, $commentdata );
-	}
-
-	/**
-	 * Extract recipient URLs from Activity object
-	 *
-	 * @param  array $data
-	 *
-	 * @return array The list of user URLs
-	 */
-	public static function extract_recipients( $data ) {
-		$recipient_items = array();
-
-		foreach ( array( 'to', 'bto', 'cc', 'bcc', 'audience' ) as $i ) {
-			if ( array_key_exists( $i, $data ) ) {
-				if ( is_array( $data[ $i ] ) ) {
-					$recipient = $data[ $i ];
-				} else {
-					$recipient = array( $data[ $i ] );
-				}
-				$recipient_items = array_merge( $recipient_items, $recipient );
-			}
-
-			if ( is_array( $data['object'] ) && array_key_exists( $i, $data['object'] ) ) {
-				if ( is_array( $data['object'][ $i ] ) ) {
-					$recipient = $data['object'][ $i ];
-				} else {
-					$recipient = array( $data['object'][ $i ] );
-				}
-				$recipient_items = array_merge( $recipient_items, $recipient );
-			}
-		}
-
-		$recipients = array();
-
-		// flatten array
-		foreach ( $recipient_items as $recipient ) {
-			if ( is_array( $recipient ) ) {
-				// check if recipient is an object
-				if ( array_key_exists( 'id', $recipient ) ) {
-					$recipients[] = $recipient['id'];
-				}
-			} else {
-				$recipients[] = $recipient;
-			}
-		}
-
-		return array_unique( $recipients );
-	}
-
 	/**
 	 * Get local user recipients
 	 *
@@ -463,7 +347,7 @@ class Inbox {
 	 * @return array The list of local users
 	 */
 	public static function get_recipients( $data ) {
-		$recipients = self::extract_recipients( $data );
+		$recipients = extract_recipients_from_activity( $data );
 		$users = array();
 
 		foreach ( $recipients as $recipient ) {
@@ -478,41 +362,4 @@ class Inbox {
 
 		return $users;
 	}
-
-	/**
-	 * Check if passed Activity is Public
-	 *
-	 * @param array $data
-	 * @return boolean
-	 */
-	public static function is_activity_public( $data ) {
-		$recipients = self::extract_recipients( $data );
-
-		return in_array( 'https://www.w3.org/ns/activitystreams#Public', $recipients, true );
-	}
-
-	/**
-	 * Adds line breaks to the list of allowed comment tags.
-	 *
-	 * @param  array  $allowedtags Allowed HTML tags.
-	 * @param  string $context     Context.
-	 * @return array               Filtered tag list.
-	 */
-	public static function allowed_comment_html( $allowedtags, $context = '' ) {
-		if ( 'pre_comment_content' !== $context ) {
-			// Do nothing.
-			return $allowedtags;
-		}
-
-		// Add `p` and `br` to the list of allowed tags.
-		if ( ! array_key_exists( 'br', $allowedtags ) ) {
-			$allowedtags['br'] = array();
-		}
-
-		if ( ! array_key_exists( 'p', $allowedtags ) ) {
-			$allowedtags['p'] = array();
-		}
-
-		return $allowedtags;
-	}
 }

includes/rest/class-outbox.php

@@ -5,7 +5,7 @@ use stdClass;
 use WP_Error;
 use WP_REST_Server;
 use WP_REST_Response;
-use Activitypub\Transformer\Transformers_Manager;
+use Activitypub\Transformer\Post;
 use Activitypub\Activity\Activity;
 use Activitypub\Collection\Users as User_Collection;
 
@@ -59,7 +59,7 @@ class Outbox {
 			return $user;
 		}
 
-		$post_types = array_keys( \get_option( 'activitypub_transformer_mapping', array( 'post' => 'activitypub/default', 'page' => 'activitypub/default' ) ) );
+		$post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) );
 
 		$page = $request->get_param( 'page', 1 );
 
@@ -105,8 +105,7 @@ class Outbox {
 			);
 
 			foreach ( $posts as $post ) {
-				$transformer = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( $post );
-				$post = $transformer->to_object();
+				$post = Post::transform( $post )->to_object();
 				$activity = new Activity();
 				$activity->set_type( 'Create' );
 				$activity->set_context( null );

includes/table/class-followers.php

@@ -30,24 +30,19 @@ class Followers extends WP_List_Table {
 
 	public function get_columns() {
 		return array(
-			'cb'         => '<input type="checkbox" />',
-			'avatar'     => \__( 'Avatar', 'activitypub' ),
-			'post_title' => \__( 'Name', 'activitypub' ),
-			'username'   => \__( 'Username', 'activitypub' ),
-			'url'        => \__( 'URL', 'activitypub' ),
-			'published'  => \__( 'Followed', 'activitypub' ),
-			'modified'   => \__( 'Last updated', 'activitypub' ),
+			'cb'           => '<input type="checkbox" />',
+			'avatar'       => \__( 'Avatar', 'activitypub' ),
+			'name'         => \__( 'Name', 'activitypub' ),
+			'username'     => \__( 'Username', 'activitypub' ),
+			'url'          => \__( 'URL', 'activitypub' ),
+			'updated'      => \__( 'Last updated', 'activitypub' ),
+			//'errors'       => \__( 'Errors', 'activitypub' ),
+			//'latest-error' => \__( 'Latest Error Message', 'activitypub' ),
 		);
 	}
 
 	public function get_sortable_columns() {
-		$sortable_columns = array(
-			'post_title' => array( 'post_title', true ),
-			'modified'   => array( 'modified', false ),
-			'published'  => array( 'published', false ),
-		);
-
-		return $sortable_columns;
+		return array();
 	}
 
 	public function prepare_items() {
@@ -60,32 +55,8 @@ class Followers extends WP_List_Table {
 		$page_num = $this->get_pagenum();
 		$per_page = 20;
 
-		$args = array();
-
-		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
-		if ( isset( $_GET['orderby'] ) ) {
-			// phpcs:ignore WordPress.Security.NonceVerification.Recommended
-			$args['orderby'] = sanitize_text_field( wp_unslash( $_GET['orderby'] ) );
-		}
-
-		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
-		if ( isset( $_GET['order'] ) ) {
-			// phpcs:ignore WordPress.Security.NonceVerification.Recommended
-			$args['order'] = sanitize_text_field( wp_unslash( $_GET['order'] ) );
-		}
-
-		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
-		if ( isset( $_GET['s'] ) && isset( $_REQUEST['_wpnonce'] ) ) {
-			$nonce = sanitize_text_field( wp_unslash( $_REQUEST['_wpnonce'] ) );
-			if ( wp_verify_nonce( $nonce, 'bulk-' . $this->_args['plural'] ) ) {
-				// phpcs:ignore WordPress.Security.NonceVerification.Recommended
-				$args['s'] = sanitize_text_field( wp_unslash( $_GET['s'] ) );
-			}
-		}
-
-		$followers_with_count = FollowerCollection::get_followers_with_count( $this->user_id, $per_page, $page_num, $args );
-		$followers            = $followers_with_count['followers'];
-		$counter              = $followers_with_count['total'];
+		$followers = FollowerCollection::get_followers( $this->user_id, $per_page, $page_num );
+		$counter   = FollowerCollection::count_followers( $this->user_id );
 
 		$this->items = array();
 		$this->set_pagination_args(
@@ -98,13 +69,14 @@ class Followers extends WP_List_Table {
 
 		foreach ( $followers as $follower ) {
 			$item = array(
-				'icon'       => esc_attr( $follower->get_icon_url() ),
-				'post_title' => esc_attr( $follower->get_name() ),
-				'username'   => esc_attr( $follower->get_preferred_username() ),
-				'url'        => esc_attr( $follower->get_url() ),
-				'identifier' => esc_attr( $follower->get_id() ),
-				'published'  => esc_attr( $follower->get_published() ),
-				'modified'   => esc_attr( $follower->get_updated() ),
+				'icon'         => esc_attr( $follower->get_icon_url() ),
+				'name'         => esc_attr( $follower->get_name() ),
+				'username'     => esc_attr( $follower->get_preferred_username() ),
+				'url'          => esc_attr( $follower->get_url() ),
+				'identifier'   => esc_attr( $follower->get_id() ),
+				'updated'      => esc_attr( $follower->get_updated() ),
+				'errors'       => $follower->count_errors(),
+				'latest-error' => $follower->get_latest_error_message(),
 			);
 
 			$this->items[] = $item;
@@ -144,11 +116,11 @@ class Followers extends WP_List_Table {
 	}
 
 	public function process_action() {
-		if ( ! isset( $_REQUEST['followers'] ) || ! isset( $_REQUEST['_wpnonce'] ) ) {
+		if ( ! isset( $_REQUEST['followers'] ) || ! isset( $_REQUEST['_apnonce'] ) ) {
 			return false;
 		}
-		$nonce = sanitize_text_field( wp_unslash( $_REQUEST['_wpnonce'] ) );
-		if ( ! wp_verify_nonce( $nonce, 'bulk-' . $this->_args['plural'] ) ) {
+		$nonce = sanitize_text_field( wp_unslash( $_REQUEST['_apnonce'] ) );
+		if ( ! wp_verify_nonce( $nonce, 'activitypub-followers-list' ) ) {
 			return false;
 		}
 

includes/transformer/class-base.php

@@ -1,619 +0,0 @@
-<?php
-/**
- * Inspired by the PHP ActivityPub Library by @Landrok
- *
- * @link https://github.com/landrok/activitypub
- */
-namespace Activitypub\Transformer;
-
-use WP_Post;
-use Activitypub\Collection\Users;
-use Activitypub\Model\Blog_User;
-use Activitypub\Activity\Base_Object;
-use Activitypub\Shortcodes;
-
-use function Activitypub\esc_hashtag;
-use function Activitypub\is_single_user;
-use function Activitypub\get_rest_url_by_path;
-use function Activitypub\site_supports_blocks;
-
-/**
- * Base class to implement WordPress to ActivityPub transformers.
- */
-abstract class Base {
-	/**
-	 * The WP_Post object.
-	 *
-	 * @var WP_Post
-	 */
-	protected $wp_post;
-
-	/**
-	 * Assign WP_Post Object to a specific transformer instance.
-	 *
-	 * This helps to chain the output of the Transformer.
-	 *
-	 * @param WP_Post $wp_post The WP_Post object.
-	 * @return void
-	 */
-	public function set_wp_post( WP_Post $wp_post ) {
-		$post_type = get_post_type( $wp_post );
-		if ( ! $this->supports_post_type( $post_type ) ) {
-			_doing_it_wrong(
-				__METHOD__,
-				/* translators: %s: Block name. */
-				sprintf( 'The Transformer "%s" does not support the post type "%s".', esc_html( $this->get_label() ), esc_html( $post_type ) ),
-				'version_number_transformer_management_placeholder'
-			);
-		}
-		$this->wp_post = $wp_post;
-	}
-
-	/**
-	 * Get the supported WP post types that the transformer can use as an input.
-	 *
-	 * By default all post types are supported.
-	 * You may very likely wish to override this function.
-	 *
-	 * @since version_number_transformer_management_placeholder
-	 * @return string[] An array containing all the supported post types.
-	 */
-	public function get_supported_post_types() {
-		return \get_post_types( array( 'public' => true ), 'names' );
-	}
-
-	/**
-	 * Get the name of the plugin that registered the transformer.
-	 *
-	 * @see Forked from the WordPress elementor plugin.
-	 * @since version_number_transformer_management_placeholder
-	 * @return string Plugin name
-	 */
-	private function get_plugin_name_from_transformer_instance( $transformer ) {
-		$class_reflection = new \ReflectionClass( $transformer );
-
-		$plugin_basename = plugin_basename( $class_reflection->getFileName() );
-
-		$plugin_directory = strtok( $plugin_basename, '/' );
-
-		$plugins_data = get_plugins( '/' . $plugin_directory );
-		$plugin_data  = array_shift( $plugins_data );
-
-		if ( isset( $plugin_data['Name'] ) ) {
-			return $plugin_data['Name'];
-		} else {
-			return esc_html__( 'Unknown', 'activitypub' );
-		}
-	}
-
-	/**
-	 * Return whether the transformer supports a post type.
-	 *
-	 * @since version_number_transformer_management_placeholder
-	 * @return string post_type Post type name.
-	 */
-	final public function supports_post_type( $post_type ) {
-		return in_array( $post_type, $this->get_supported_post_types(), true );
-	}
-
-	/**
-	 * Get the name used for registering the transformer with the ActivityPub plugin.
-	 *
-	 * @since version_number_transformer_management_placeholder
-	 * @return string name
-	 */
-	abstract public function get_name();
-
-	/**
-	 * Get the display name for the ActivityPub transformer.
-	 *
-	 * @since version_number_transformer_management_placeholder
-	 * @return string display name
-	 */
-	abstract public function get_label();
-
-	/**
-	 * Returns the ActivityStreams 2.0 Object-Type for a Post.
-	 *
-	 * @see https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
-	 *
-	 * @return string The Object-Type.
-	 */
-	abstract protected function get_object_type();
-
-	/**
-	 * Returns the content for the ActivityPub Item.
-	 *
-	 * The content will be generated based on the user settings.
-	 *
-	 * @return string The content.
-	 */
-	protected function get_content() {
-		global $post;
-
-		/**
-		 * Provides an action hook so plugins can add their own hooks/filters before AP content is generated.
-		 *
-		 * Example: if a plugin adds a filter to `the_content` to add a button to the end of posts, it can also remove that filter here.
-		 *
-		 * @param WP_Post $post The post object.
-		 */
-		do_action( 'activitypub_before_get_content', $post );
-
-		// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
-		$post    = $this->wp_post;
-		$content = $this->get_post_content_template();
-
-		// Register our shortcodes just in time.
-		Shortcodes::register();
-		// Fill in the shortcodes.
-		setup_postdata( $post );
-		$content = do_shortcode( $content );
-		wp_reset_postdata();
-
-		$content = \wpautop( $content );
-		$content = \preg_replace( '/[\n\r\t]/', '', $content );
-		$content = \trim( $content );
-
-		$content = \apply_filters( 'activitypub_the_content', $content, $post );
-
-		// Don't need these any more, should never appear in a post.
-		Shortcodes::unregister();
-
-		return $content;
-	}
-
-	/**
-	 * Gets the template to use to generate the content of the activitypub item.
-	 *
-	 * @return string The Template.
-	 */
-	protected function get_post_content_template() {
-		if ( 'excerpt' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
-			return "[ap_excerpt]\n\n[ap_permalink type=\"html\"]";
-		}
-
-		if ( 'title' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
-			return "[ap_title]\n\n[ap_permalink type=\"html\"]";
-		}
-
-		if ( 'content' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
-			return "[ap_content]\n\n[ap_permalink type=\"html\"]\n\n[ap_hashtags]";
-		}
-
-		return \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
-	}
-
-	/**
-	 * Returns the ID of the Post.
-	 *
-	 * @return string The Posts ID.
-	 */
-	public function get_id() {
-		return $this->get_url();
-	}
-
-	/**
-	 * Returns the URL of the Post.
-	 *
-	 * @return string The Posts URL.
-	 */
-	public function get_url() {
-		$post = $this->wp_post;
-
-		if ( 'trash' === get_post_status( $post ) ) {
-			$permalink = \get_post_meta( $post->ID, 'activitypub_canonical_url', true );
-		} else {
-			$permalink = \get_permalink( $post );
-		}
-
-		return \esc_url( $permalink );
-	}
-
-	/**
-	 * Returns the User-URL of the Author of the Post.
-	 *
-	 * If `single_user` mode is enabled, the URL of the Blog-User is returned.
-	 *
-	 * @return string The User-URL.
-	 */
-	protected function get_attributed_to() {
-		if ( is_single_user() ) {
-			$user = new Blog_User();
-			return $user->get_url();
-		}
-
-		return Users::get_by_id( $this->wp_post->post_author )->get_url();
-	}
-
-	/**
-	 * Generates all Media Attachments for a Post.
-	 *
-	 * @return array The Attachments.
-	 */
-	protected function get_attachments() {
-		// Once upon a time we only supported images, but we now support audio/video as well.
-		// We maintain the image-centric naming for backwards compatibility.
-		$max_media = intval( \apply_filters( 'activitypub_max_image_attachments', \get_option( 'activitypub_max_image_attachments', ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS ) ) );
-
-		if ( site_supports_blocks() && \has_blocks( $this->wp_post->post_content ) ) {
-			return $this->get_block_attachments( $max_media );
-		}
-
-		return $this->get_classic_editor_images( $max_media );
-	}
-
-	/**
-	 * Get media attachments from blocks. They will be formatted as ActivityPub attachments, not as WP attachments.
-	 *
-	 * @param int $max_media The maximum number of attachments to return.
-	 *
-	 * @return array The attachments.
-	 */
-	protected function get_block_attachments( $max_media ) {
-		// max media can't be negative or zero
-		if ( $max_media <= 0 ) {
-			return array();
-		}
-
-		$id = $this->wp_post->ID;
-
-		$media_ids = array();
-
-		// list post thumbnail first if this post has one
-		if ( \function_exists( 'has_post_thumbnail' ) && \has_post_thumbnail( $id ) ) {
-			$media_ids[] = \get_post_thumbnail_id( $id );
-		}
-
-		if ( $max_media > 0 ) {
-			$blocks    = \parse_blocks( $this->wp_post->post_content );
-			$media_ids = self::get_media_ids_from_blocks( $blocks, $media_ids, $max_media );
-		}
-
-		return \array_filter( \array_map( array( self::class, 'wp_attachment_to_activity_attachment' ), $media_ids ) );
-	}
-
-	/**
-	 * Get image attachments from the classic editor.
-	 * Note that audio/video attachments are only supported in the block editor.
-	 *
-	 * @param int $max_images The maximum number of images to return.
-	 *
-	 * @return array The attachments.
-	 */
-	protected function get_classic_editor_images( $max_images ) {
-		// max images can't be negative or zero
-		if ( $max_images <= 0 ) {
-			return array();
-		}
-
-		$id = $this->wp_post->ID;
-
-		$image_ids = array();
-
-		// list post thumbnail first if this post has one
-		if ( \function_exists( 'has_post_thumbnail' ) && \has_post_thumbnail( $id ) ) {
-			$image_ids[] = \get_post_thumbnail_id( $id );
-			--$max_images;
-		}
-
-		if ( $max_images > 0 ) {
-			$query = new \WP_Query(
-				array(
-					'post_parent'    => $id,
-					'post_status'    => 'inherit',
-					'post_type'      => 'attachment',
-					'post_mime_type' => 'image',
-					'order'          => 'ASC',
-					'orderby'        => 'menu_order ID',
-					'posts_per_page' => $max_images,
-				)
-			);
-			foreach ( $query->get_posts() as $attachment ) {
-				if ( ! \in_array( $attachment->ID, $image_ids, true ) ) {
-					$image_ids[] = $attachment->ID;
-				}
-			}
-		}
-		$image_ids = \array_unique( $image_ids );
-
-		return \array_filter( \array_map( array( self::class, 'wp_attachment_to_activity_attachment' ), $image_ids ) );
-	}
-
-	/**
-	 * Recursively get media IDs from blocks.
-	 *
-	 * @param array $blocks The blocks to search for media IDs
-	 * @param array $media_ids The media IDs to append new IDs to
-	 * @param int   $max_media The maximum number of media to return.
-	 *
-	 * @return array The image IDs.
-	 */
-	protected static function get_media_ids_from_blocks( $blocks, $media_ids, $max_media ) {
-
-		foreach ( $blocks as $block ) {
-			// recurse into inner blocks
-			if ( ! empty( $block['innerBlocks'] ) ) {
-				$media_ids = self::get_media_ids_from_blocks( $block['innerBlocks'], $media_ids, $max_media );
-			}
-
-			switch ( $block['blockName'] ) {
-				case 'core/image':
-				case 'core/cover':
-				case 'core/audio':
-				case 'core/video':
-				case 'videopress/video':
-					if ( ! empty( $block['attrs']['id'] ) ) {
-						$media_ids[] = $block['attrs']['id'];
-					}
-					break;
-				case 'jetpack/slideshow':
-				case 'jetpack/tiled-gallery':
-					if ( ! empty( $block['attrs']['ids'] ) ) {
-						$media_ids = array_merge( $media_ids, $block['attrs']['ids'] );
-					}
-					break;
-				case 'jetpack/image-compare':
-					if ( ! empty( $block['attrs']['beforeImageId'] ) ) {
-						$media_ids[] = $block['attrs']['beforeImageId'];
-					}
-					if ( ! empty( $block['attrs']['afterImageId'] ) ) {
-						$media_ids[] = $block['attrs']['afterImageId'];
-					}
-					break;
-			}
-
-			// depupe
-			$media_ids = \array_unique( $media_ids );
-
-			// stop doing unneeded work
-			if ( count( $media_ids ) >= $max_media ) {
-				break;
-			}
-		}
-
-		// still need to slice it because one gallery could knock us over the limit
-		return array_slice( $media_ids, 0, $max_media );
-	}
-
-	/**
-	 * Converts a WordPress Attachment to an ActivityPub Attachment.
-	 *
-	 * @param int $id The Attachment ID.
-	 *
-	 * @return array The ActivityPub Attachment.
-	 */
-	public static function wp_attachment_to_activity_attachment( $id ) {
-		$attachment      = array();
-		$mime_type       = \get_post_mime_type( $id );
-		$mime_type_parts = \explode( '/', $mime_type );
-		// switching on image/audio/video
-		switch ( $mime_type_parts[0] ) {
-			case 'image':
-				$image_size = 'full';
-
-				/**
-				 * Filter the image URL returned for each post.
-				 *
-				 * @param array|false $thumbnail The image URL, or false if no image is available.
-				 * @param int         $id        The attachment ID.
-				 * @param string      $image_size The image size to retrieve. Set to 'full' by default.
-				 */
-				$thumbnail = apply_filters(
-					'activitypub_get_image',
-					self::get_image( $id, $image_size ),
-					$id,
-					$image_size
-				);
-
-				if ( $thumbnail ) {
-					$alt   = \get_post_meta( $id, '_wp_attachment_image_alt', true );
-					$image = array(
-						'type'      => 'Image',
-						'url'       => $thumbnail[0],
-						'mediaType' => $mime_type,
-					);
-
-					if ( $alt ) {
-						$image['name'] = $alt;
-					}
-					$attachment = $image;
-				}
-				break;
-
-			case 'audio':
-			case 'video':
-				$attachment = array(
-					'type'      => 'Document',
-					'mediaType' => $mime_type,
-					'url'       => \wp_get_attachment_url( $id ),
-					'name'      => \get_the_title( $id ),
-				);
-				$meta       = wp_get_attachment_metadata( $id );
-				// height and width for videos
-				if ( isset( $meta['width'] ) && isset( $meta['height'] ) ) {
-					$attachment['width']  = $meta['width'];
-					$attachment['height'] = $meta['height'];
-				}
-				// @todo: add `icon` support for audio/video attachments. Maybe use post thumbnail?
-				break;
-		}
-
-		return \apply_filters( 'activitypub_attachment', $attachment, $id );
-	}
-
-	/**
-	 * Return details about an image attachment.
-	 *
-	 * @param int    $id         The attachment ID.
-	 * @param string $image_size The image size to retrieve. Set to 'full' by default.
-	 *
-	 * @return array|false Array of image data, or boolean false if no image is available.
-	 */
-	protected static function get_image( $id, $image_size = 'full' ) {
-		/**
-		 * Hook into the image retrieval process. Before image retrieval.
-		 *
-		 * @param int    $id         The attachment ID.
-		 * @param string $image_size The image size to retrieve. Set to 'full' by default.
-		 */
-		do_action( 'activitypub_get_image_pre', $id, $image_size );
-
-		$image = \wp_get_attachment_image_src( $id, $image_size );
-
-		/**
-		 * Hook into the image retrieval process. After image retrieval.
-		 *
-		 * @param int    $id         The attachment ID.
-		 * @param string $image_size The image size to retrieve. Set to 'full' by default.
-		 */
-		do_action( 'activitypub_get_image_post', $id, $image_size );
-
-		return $image;
-	}
-
-
-	/**
-	 * Helper function to get the @-Mentions from the post content.
-	 *
-	 * @return array The list of @-Mentions.
-	 */
-	protected function get_mentions() {
-		return apply_filters( 'activitypub_extract_mentions', array(), $this->wp_post->post_content, $this->wp_post );
-	}
-
-		/**
-		 * Returns a list of Mentions, used in the Post.
-		 *
-		 * @see https://docs.joinmastodon.org/spec/activitypub/#Mention
-		 *
-		 * @return array The list of Mentions.
-		 */
-	protected function get_cc() {
-		$cc = array();
-
-		$mentions = $this->get_mentions();
-		if ( $mentions ) {
-			foreach ( $mentions as $url ) {
-				$cc[] = $url;
-			}
-		}
-
-		return $cc;
-	}
-
-	/**
-	 * Returns a list of Tags, used in the Post.
-	 *
-	 * This includes Hash-Tags and Mentions.
-	 *
-	 * @return array The list of Tags.
-	 */
-	protected function get_tags() {
-		$tags = array();
-
-		$post_tags = \get_the_tags( $this->wp_post->ID );
-		if ( $post_tags ) {
-			foreach ( $post_tags as $post_tag ) {
-				$tag    = array(
-					'type' => 'Hashtag',
-					'href' => \esc_url( \get_tag_link( $post_tag->term_id ) ),
-					'name' => esc_hashtag( $post_tag->name ),
-				);
-				$tags[] = $tag;
-			}
-		}
-
-		$mentions = $this->get_mentions();
-		if ( $mentions ) {
-			foreach ( $mentions as $mention => $url ) {
-				$tag    = array(
-					'type' => 'Mention',
-					'href' => \esc_url( $url ),
-					'name' => \esc_html( $mention ),
-				);
-				$tags[] = $tag;
-			}
-		}
-
-		return $tags;
-	}
-
-
-	/**
-	 * Returns the locale of the post.
-	 *
-	 * @return string The locale of the post.
-	 */
-	public function get_locale() {
-		$post_id = $this->wp_post->ID;
-		$lang    = \strtolower( \strtok( \get_locale(), '_-' ) );
-
-		/**
-		 * Filter the locale of the post.
-		 *
-		 * @param string  $lang    The locale of the post.
-		 * @param int     $post_id The post ID.
-		 * @param WP_Post $post    The post object.
-		 *
-		 * @return string The filtered locale of the post.
-		 */
-		return apply_filters( 'activitypub_post_locale', $lang, $post_id, $this->wp_post );
-	}
-
-	/**
-	 * Gets the contentMap
-	 *
-	 * @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-contentmap
-	 *
-	 * @return array the contenmap
-	 */
-	protected function get_content_map() {
-		return array(
-			$this->get_locale() => $this->get_content(),
-		);
-	}
-
-	/**
-	 * Transforms the WP_Post object to an ActivityPub Object
-	 *
-	 * @see \Activitypub\Activity\Base_Object
-	 *
-	 * @return \Activitypub\Activity\Base_Object The ActivityPub Object
-	 */
-	public function to_object() {
-		$wp_post = $this->wp_post;
-		$object  = new Base_Object();
-
-		$object->set_id( $this->get_id() );
-		$object->set_url( $this->get_url() );
-		$object->set_type( $this->get_object_type() );
-
-		$published = \strtotime( $wp_post->post_date_gmt );
-
-		$object->set_published( \gmdate( 'Y-m-d\TH:i:s\Z', $published ) );
-
-		$updated = \strtotime( $wp_post->post_modified_gmt );
-
-		if ( $updated > $published ) {
-			$object->set_updated( \gmdate( 'Y-m-d\TH:i:s\Z', $updated ) );
-		}
-
-		$object->set_attributed_to( $this->get_attributed_to() );
-		$object->set_content( $this->get_content() );
-		$object->set_content_map( $this->get_content_map );
-		$path = sprintf( 'users/%d/followers', intval( $wp_post->post_author ) );
-
-		$object->set_to(
-			array(
-				'https://www.w3.org/ns/activitystreams#Public',
-				get_rest_url_by_path( $path ),
-			)
-		);
-		$object->set_cc( $this->get_cc() );
-		$object->set_attachment( $this->get_attachments() );
-		$object->set_tag( $this->get_tags() );
-
-		return $object;
-	}
-}

includes/transformer/class-post.php

@@ -6,7 +6,6 @@ use Activitypub\Collection\Users;
 use Activitypub\Model\Blog_User;
 use Activitypub\Activity\Base_Object;
 use Activitypub\Shortcodes;
-use Activitypub\Transformer\Base;
 
 use function Activitypub\esc_hashtag;
 use function Activitypub\is_single_user;
@@ -15,29 +14,375 @@ use function Activitypub\site_supports_blocks;
 
 /**
  * WordPress Post Transformer
+ *
  * The Post Transformer is responsible for transforming a WP_Post object into different othe
  * Object-Types.
  *
  * Currently supported are:
+ *
  * - Activitypub\Activity\Base_Object
  */
-class Post extends Base {
+class Post {
+
 	/**
-	 * Getter function for the name of the transformer.
+	 * The WP_Post object.
 	 *
-	 * @return string name
+	 * @var WP_Post
 	 */
-	public function get_name() {
-		return 'activitypub/default';
+	protected $wp_post;
+
+	/**
+	 * Static function to Transform a WP_Post Object.
+	 *
+	 * This helps to chain the output of the Transformer.
+	 *
+	 * @param WP_Post $wp_post The WP_Post object
+	 *
+	 * @return void
+	 */
+	public static function transform( WP_Post $wp_post ) {
+		return new static( $wp_post );
 	}
 
 	/**
-	 * Getter function for the display name (label/title) of the transformer.
 	 *
-	 * @return string name
+	 *
+	 * @param WP_Post $wp_post
 	 */
-	public function get_label() {
-		return 'Built-In';
+	public function __construct( WP_Post $wp_post ) {
+		$this->wp_post = $wp_post;
+	}
+
+	/**
+	 * Transforms the WP_Post object to an ActivityPub Object
+	 *
+	 * @see \Activitypub\Activity\Base_Object
+	 *
+	 * @return \Activitypub\Activity\Base_Object The ActivityPub Object
+	 */
+	public function to_object() {
+		$wp_post = $this->wp_post;
+		$object = new Base_Object();
+
+		$object->set_id( $this->get_id() );
+		$object->set_url( $this->get_url() );
+		$object->set_type( $this->get_object_type() );
+
+		$published = \strtotime( $wp_post->post_date_gmt );
+
+		$object->set_published( \gmdate( 'Y-m-d\TH:i:s\Z', $published ) );
+
+		$updated = \strtotime( $wp_post->post_modified_gmt );
+
+		if ( $updated > $published ) {
+			$object->set_updated( \gmdate( 'Y-m-d\TH:i:s\Z', $updated ) );
+		}
+
+		$object->set_attributed_to( $this->get_attributed_to() );
+		$object->set_content( $this->get_content() );
+		$object->set_content_map(
+			array(
+				$this->get_locale() => $this->get_content(),
+			)
+		);
+		$path = sprintf( 'users/%d/followers', intval( $wp_post->post_author ) );
+
+		$object->set_to(
+			array(
+				'https://www.w3.org/ns/activitystreams#Public',
+				get_rest_url_by_path( $path ),
+			)
+		);
+		$object->set_cc( $this->get_cc() );
+		$object->set_attachment( $this->get_attachments() );
+		$object->set_tag( $this->get_tags() );
+
+		return $object;
+	}
+
+	/**
+	 * Returns the ID of the Post.
+	 *
+	 * @return string The Posts ID.
+	 */
+	public function get_id() {
+		return $this->get_url();
+	}
+
+	/**
+	 * Returns the URL of the Post.
+	 *
+	 * @return string The Posts URL.
+	 */
+	public function get_url() {
+		$post = $this->wp_post;
+
+		if ( 'trash' === get_post_status( $post ) ) {
+			$permalink = \get_post_meta( $post->ID, 'activitypub_canonical_url', true );
+		} else {
+			$permalink = \get_permalink( $post );
+		}
+
+		return \esc_url( $permalink );
+	}
+
+	/**
+	 * Returns the User-URL of the Author of the Post.
+	 *
+	 * If `single_user` mode is enabled, the URL of the Blog-User is returned.
+	 *
+	 * @return string The User-URL.
+	 */
+	protected function get_attributed_to() {
+		if ( is_single_user() ) {
+			$user = new Blog_User();
+			return $user->get_url();
+		}
+
+		return Users::get_by_id( $this->wp_post->post_author )->get_url();
+	}
+
+	/**
+	 * Generates all Media Attachments for a Post.
+	 *
+	 * @return array The Attachments.
+	 */
+	protected function get_attachments() {
+		// Once upon a time we only supported images, but we now support audio/video as well.
+		// We maintain the image-centric naming for backwards compatibility.
+		$max_media = intval( \apply_filters( 'activitypub_max_image_attachments', \get_option( 'activitypub_max_image_attachments', ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS ) ) );
+
+		if ( site_supports_blocks() && \has_blocks( $this->wp_post->post_content ) ) {
+			return $this->get_block_attachments( $max_media );
+		}
+
+		return $this->get_classic_editor_images( $max_media );
+	}
+
+	/**
+	 * Get media attachments from blocks. They will be formatted as ActivityPub attachments, not as WP attachments.
+	 *
+	 * @param int $max_media The maximum number of attachments to return.
+	 *
+	 * @return array The attachments.
+	 */
+	protected function get_block_attachments( $max_media ) {
+		// max media can't be negative or zero
+		if ( $max_media <= 0 ) {
+			return array();
+		}
+
+		$id = $this->wp_post->ID;
+
+		$media_ids = array();
+
+		// list post thumbnail first if this post has one
+		if ( \function_exists( 'has_post_thumbnail' ) && \has_post_thumbnail( $id ) ) {
+			$media_ids[] = \get_post_thumbnail_id( $id );
+		}
+
+		if ( $max_media > 0 ) {
+			$blocks = \parse_blocks( $this->wp_post->post_content );
+			$media_ids = self::get_media_ids_from_blocks( $blocks, $media_ids, $max_media );
+		}
+		$media_ids = \array_unique( $media_ids );
+
+		return \array_filter( \array_map( array( self::class, 'wp_attachment_to_activity_attachment' ), $media_ids ) );
+	}
+
+	/**
+	 * Get image attachments from the classic editor.
+	 * Note that audio/video attachments are only supported in the block editor.
+	 *
+	 * @param int $max_images The maximum number of images to return.
+	 *
+	 * @return array The attachments.
+	 */
+	protected function get_classic_editor_images( $max_images ) {
+		// max images can't be negative or zero
+		if ( $max_images <= 0 ) {
+			return array();
+		}
+
+		$id = $this->wp_post->ID;
+
+		$image_ids = array();
+
+		// list post thumbnail first if this post has one
+		if ( \function_exists( 'has_post_thumbnail' ) && \has_post_thumbnail( $id ) ) {
+			$image_ids[] = \get_post_thumbnail_id( $id );
+			--$max_images;
+		}
+
+		if ( $max_images > 0 ) {
+			$query = new \WP_Query(
+				array(
+					'post_parent' => $id,
+					'post_status' => 'inherit',
+					'post_type' => 'attachment',
+					'post_mime_type' => 'image',
+					'order' => 'ASC',
+					'orderby' => 'menu_order ID',
+					'posts_per_page' => $max_images,
+				)
+			);
+			foreach ( $query->get_posts() as $attachment ) {
+				if ( ! \in_array( $attachment->ID, $image_ids, true ) ) {
+					$image_ids[] = $attachment->ID;
+				}
+			}
+		}
+		$image_ids = \array_unique( $image_ids );
+
+		return \array_filter( \array_map( array( self::class, 'wp_attachment_to_activity_attachment' ), $image_ids ) );
+	}
+
+	/**
+	 * Recursively get media IDs from blocks.
+	 * @param array $blocks The blocks to search for media IDs
+	 * @param array $media_ids The media IDs to append new IDs to
+	 * @param int $max_media The maximum number of media to return.
+	 *
+	 * @return array The image IDs.
+	 */
+	protected static function get_media_ids_from_blocks( $blocks, $media_ids, $max_media ) {
+
+		foreach ( $blocks as $block ) {
+			// recurse into inner blocks
+			if ( ! empty( $block['innerBlocks'] ) ) {
+				$media_ids = self::get_media_ids_from_blocks( $block['innerBlocks'], $media_ids, $max_media );
+			}
+
+			switch ( $block['blockName'] ) {
+				case 'core/image':
+				case 'core/cover':
+				case 'core/audio':
+				case 'core/video':
+				case 'videopress/video':
+					if ( ! empty( $block['attrs']['id'] ) ) {
+						$media_ids[] = $block['attrs']['id'];
+					}
+					break;
+				case 'jetpack/slideshow':
+				case 'jetpack/tiled-gallery':
+					if ( ! empty( $block['attrs']['ids'] ) ) {
+						$media_ids = array_merge( $media_ids, $block['attrs']['ids'] );
+					}
+					break;
+				case 'jetpack/image-compare':
+					if ( ! empty( $block['attrs']['beforeImageId'] ) ) {
+						$media_ids[] = $block['attrs']['beforeImageId'];
+					}
+					if ( ! empty( $block['attrs']['afterImageId'] ) ) {
+						$media_ids[] = $block['attrs']['afterImageId'];
+					}
+					break;
+			}
+
+			// stop doing unneeded work
+			if ( count( $media_ids ) >= $max_media ) {
+				break;
+			}
+		}
+
+		// still need to slice it because one gallery could knock us over the limit
+		return array_slice( $media_ids, 0, $max_media );
+	}
+
+	/**
+	 * Converts a WordPress Attachment to an ActivityPub Attachment.
+	 *
+	 * @param int $id The Attachment ID.
+	 *
+	 * @return array The ActivityPub Attachment.
+	 */
+	public static function wp_attachment_to_activity_attachment( $id ) {
+		$attachment = array();
+		$mime_type = \get_post_mime_type( $id );
+		$mime_type_parts = \explode( '/', $mime_type );
+		// switching on image/audio/video
+		switch ( $mime_type_parts[0] ) {
+			case 'image':
+				$image_size = 'full';
+
+				/**
+				 * Filter the image URL returned for each post.
+				 *
+				 * @param array|false $thumbnail The image URL, or false if no image is available.
+				 * @param int         $id        The attachment ID.
+				 * @param string      $image_size The image size to retrieve. Set to 'full' by default.
+				 */
+				$thumbnail = apply_filters(
+					'activitypub_get_image',
+					self::get_image( $id, $image_size ),
+					$id,
+					$image_size
+				);
+
+				if ( $thumbnail ) {
+					$alt   = \get_post_meta( $id, '_wp_attachment_image_alt', true );
+					$image = array(
+						'type'      => 'Image',
+						'url'       => $thumbnail[0],
+						'mediaType' => $mime_type,
+					);
+
+					if ( $alt ) {
+						$image['name'] = $alt;
+					}
+					$attachment = $image;
+				}
+				break;
+
+			case 'audio':
+			case 'video':
+				$attachment = array(
+					'type'      => 'Document',
+					'mediaType' => $mime_type,
+					'url'       => \wp_get_attachment_url( $id ),
+					'name'      => \get_the_title( $id ),
+				);
+				$meta = wp_get_attachment_metadata( $id );
+				// height and width for videos
+				if ( isset( $meta['width'] ) && isset( $meta['height'] ) ) {
+					$attachment['width'] = $meta['width'];
+					$attachment['height'] = $meta['height'];
+				}
+				// @todo: add `icon` support for audio/video attachments. Maybe use post thumbnail?
+				break;
+		}
+
+		return \apply_filters( 'activitypub_attachment', $attachment, $id );
+	}
+
+	/**
+	 * Return details about an image attachment.
+	 *
+	 * @param int    $id         The attachment ID.
+	 * @param string $image_size The image size to retrieve. Set to 'full' by default.
+	 *
+	 * @return array|false Array of image data, or boolean false if no image is available.
+	 */
+	protected static function get_image( $id, $image_size = 'full' ) {
+		/**
+		 * Hook into the image retrieval process. Before image retrieval.
+		 *
+		 * @param int    $id         The attachment ID.
+		 * @param string $image_size The image size to retrieve. Set to 'full' by default.
+		 */
+		do_action( 'activitypub_get_image_pre', $id, $image_size );
+
+		$image = \wp_get_attachment_image_src( $id, $image_size );
+
+		/**
+		 * Hook into the image retrieval process. After image retrieval.
+		 *
+		 * @param int    $id         The attachment ID.
+		 * @param string $image_size The image size to retrieve. Set to 'full' by default.
+		 */
+		do_action( 'activitypub_get_image_post', $id, $image_size );
+
+		return $image;
 	}
 
 	/**
@@ -55,7 +400,7 @@ class Post extends Base {
 
 		// Default to Article.
 		$object_type = 'Article';
-		$post_type   = \get_post_type( $this->wp_post );
+		$post_type = \get_post_type( $this->wp_post );
 		switch ( $post_type ) {
 			case 'post':
 				$post_format = \get_post_format( $this->wp_post );
@@ -85,7 +430,7 @@ class Post extends Base {
 				$object_type = 'Page';
 				break;
 			case 'attachment':
-				$mime_type  = \get_post_mime_type();
+				$mime_type = \get_post_mime_type();
 				$media_type = \preg_replace( '/(\/[a-zA-Z]+)/i', '', $mime_type );
 				switch ( $media_type ) {
 					case 'audio':
@@ -106,4 +451,154 @@ class Post extends Base {
 
 		return $object_type;
 	}
+
+	/**
+	 * Returns a list of Mentions, used in the Post.
+	 *
+	 * @see https://docs.joinmastodon.org/spec/activitypub/#Mention
+	 *
+	 * @return array The list of Mentions.
+	 */
+	protected function get_cc() {
+		$cc = array();
+
+		$mentions = $this->get_mentions();
+		if ( $mentions ) {
+			foreach ( $mentions as $url ) {
+				$cc[] = $url;
+			}
+		}
+
+		return $cc;
+	}
+
+	/**
+	 * Returns a list of Tags, used in the Post.
+	 *
+	 * This includes Hash-Tags and Mentions.
+	 *
+	 * @return array The list of Tags.
+	 */
+	protected function get_tags() {
+		$tags = array();
+
+		$post_tags = \get_the_tags( $this->wp_post->ID );
+		if ( $post_tags ) {
+			foreach ( $post_tags as $post_tag ) {
+				$tag = array(
+					'type' => 'Hashtag',
+					'href' => \esc_url( \get_tag_link( $post_tag->term_id ) ),
+					'name' => esc_hashtag( $post_tag->name ),
+				);
+				$tags[] = $tag;
+			}
+		}
+
+		$mentions = $this->get_mentions();
+		if ( $mentions ) {
+			foreach ( $mentions as $mention => $url ) {
+				$tag = array(
+					'type' => 'Mention',
+					'href' => \esc_url( $url ),
+					'name' => \esc_html( $mention ),
+				);
+				$tags[] = $tag;
+			}
+		}
+
+		return $tags;
+	}
+
+	/**
+	 * Returns the content for the ActivityPub Item.
+	 *
+	 * The content will be generated based on the user settings.
+	 *
+	 * @return string The content.
+	 */
+	protected function get_content() {
+		global $post;
+
+		/**
+		 * Provides an action hook so plugins can add their own hooks/filters before AP content is generated.
+		 *
+		 * Example: if a plugin adds a filter to `the_content` to add a button to the end of posts, it can also remove that filter here.
+		 *
+		 * @param WP_Post $post The post object.
+		 */
+		do_action( 'activitypub_before_get_content', $post );
+
+		// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
+		$post    = $this->wp_post;
+		$content = $this->get_post_content_template();
+
+		// Register our shortcodes just in time.
+		Shortcodes::register();
+		// Fill in the shortcodes.
+		setup_postdata( $post );
+		$content = do_shortcode( $content );
+		wp_reset_postdata();
+
+		$content = \wpautop( $content );
+		$content = \preg_replace( '/[\n\r\t]/', '', $content );
+		$content = \trim( $content );
+
+		$content = \apply_filters( 'activitypub_the_content', $content, $post );
+
+		// Don't need these any more, should never appear in a post.
+		Shortcodes::unregister();
+
+		return $content;
+	}
+
+	/**
+	 * Gets the template to use to generate the content of the activitypub item.
+	 *
+	 * @return string The Template.
+	 */
+	protected function get_post_content_template() {
+		if ( 'excerpt' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
+			return "[ap_excerpt]\n\n[ap_permalink type=\"html\"]";
+		}
+
+		if ( 'title' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
+			return "[ap_title]\n\n[ap_permalink type=\"html\"]";
+		}
+
+		if ( 'content' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
+			return "[ap_content]\n\n[ap_permalink type=\"html\"]\n\n[ap_hashtags]";
+		}
+
+		return \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
+	}
+
+	/**
+	 * Helper function to get the @-Mentions from the post content.
+	 *
+	 * @return array The list of @-Mentions.
+	 */
+	protected function get_mentions() {
+		return apply_filters( 'activitypub_extract_mentions', array(), $this->wp_post->post_content, $this->wp_post );
+	}
+
+	/**
+	 * Returns the locale of the post.
+	 *
+	 * @return string The locale of the post.
+	 */
+	public function get_locale() {
+		$post_id = $this->wp_post->ID;
+		$lang    = \strtolower( \strtok( \get_locale(), '_-' ) );
+
+		/**
+		 * Filter the locale of the post.
+		 *
+		 * @param string  $lang    The locale of the post.
+		 * @param int     $post_id The post ID.
+		 * @param WP_Post $post    The post object.
+		 *
+		 * @return string The filtered locale of the post.
+		 */
+		return apply_filters( 'activitypub_post_locale', $lang, $post_id, $this->wp_post );
+	}
 }

includes/transformer/class-transformers-manager.php

@@ -1,292 +0,0 @@
-<?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 Transformers_Manager {
-	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;
-
-	/**
-	 * Transformer_Manager instance.
-	 *
-	 * Holds the transformer instance.
-	 *
-	 * @since version_number_transformer_management_placeholder
-	 * @access protected
-	 *
-	 * @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
-	 *
-	 * @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();
-	}
-
-	/**
-	 * 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.
-	 */
-	public function register( \ActivityPub\Transformer\Base $transformer_instance ) {
-
-		if ( ! $transformer_instance instanceof \ActivityPub\Transformer\Base ) {
-			_doing_it_wrong(
-				__METHOD__,
-				\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__,
-				\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__,
-				\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. */
-				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 ) {
-		//  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 = [
-			'post',
-		];
-
-		$this->transformers = [];
-
-		foreach ( $builtin_transformers as $transformer_name ) {
-			include ACTIVITYPUB_PLUGIN_DIR . 'includes/transformer/class-' . $transformer_name . '.php';
-
-			$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 Transformers_Manager $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
-	 *
-	 * @param string $transformer_name Optional. Transformer name. Default is null.
-	 *
-	 * @return Base|Base[]|null Registered transformers.
-	 */
-	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
-	 *
-	 * @param WP_Post|WP_Comment $object The WordPress Post/Comment.
-	 *
-	 * @return \ActivityPub\Transformer\Base|null Registered transformers.
-	 */
-	public function get_transformer( $object ) {
-		switch ( get_class( $object ) ) {
-			case 'WP_Post':
-				$post_type = get_post_type( $object );
-				$transformer_mapping = \get_option( 'activitypub_transformer_mapping', self::DEFAULT_TRANSFORMER_MAPPING );
-				$transformer_name = $transformer_mapping[ $post_type ];
-				$transformer_class = $this->get_transformers( $transformer_name );
-				$transformer_instance = new $transformer_class();
-				$transformer_instance->set_wp_post( $object );
-				return $transformer_instance;
-			case 'WP_Comment':
-				return new Comment( $object );
-			default:
-				return apply_filters( 'activitypub_transformer', null, $object, get_class( $object ) );
-		}
-	}
-}

integration/class-webfinger.php

@@ -30,10 +30,6 @@ class Webfinger {
 	public static function add_user_discovery( $array, $resource, $user ) {
 		$user = User_Collection::get_by_id( $user->ID );
 
-		if ( ! $user || is_wp_error( $user ) ) {
-			return $array;
-		}
-
 		$array['links'][] = array(
 			'rel'  => 'self',
 			'type' => 'application/activity+json',

readme.txt

@@ -3,7 +3,7 @@ Contributors: automattic, pfefferle, mediaformat, mattwiebe, akirk, jeherve, nur
 Tags: OStatus, fediverse, activitypub, activitystream
 Requires at least: 4.7
 Tested up to: 6.4
-Stable tag: 1.2.0
+Stable tag: 1.1.0
 Requires PHP: 5.6
 License: MIT
 License URI: http://opensource.org/licenses/MIT
@@ -105,15 +105,6 @@ Where 'blog' is the path to the subdirectory at which your blog resides.
 
 Project maintained on GitHub at [automattic/wordpress-activitypub](https://github.com/automattic/wordpress-activitypub).
 
-= 1.2.0 =
-
-* Add: Search and order followerer lists
-* Add: Have a filter to defer signature verification
-* Improved: "Follow Me" styles for dark themes
-* Improved: Allow `p` and `br` tags only for AP comments
-* Fixed: Deduplicate attachments earlier to prevent incorrect max_media
-
-
 = 1.1.0 =
 
 * Improved: audio and video attachments are now supported!

templates/blog-user-followers-list.php

@@ -21,8 +21,8 @@ $followers_template = _n( 'Your blog profile currently has %s follower.', 'Your
 		<input type="hidden" name="tab" value="followers" />
 		<?php
 		$table->prepare_items();
-		$table->search_box( 'Search', 'search' );
 		$table->display();
 		?>
+		<?php wp_nonce_field( 'activitypub-followers-list', '_apnonce' ); ?>
 		</form>
 </div>

templates/post-json.php

@@ -2,9 +2,8 @@
 // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
 $post = \get_post();
 
-$transformer = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( $post );
-
-$json = \array_merge( array( '@context' => \Activitypub\get_context() ), $transformer->to_object()->to_array() );
+$object = new \Activitypub\Transformer\Post( $post );
+$json = \array_merge( array( '@context' => \Activitypub\get_context() ), $object->to_object()->to_array() );
 
 // filter output
 $json = \apply_filters( 'activitypub_json_post_array', $json );

templates/settings.php

@@ -201,6 +201,26 @@
 							</p>
 						</td>
 					</tr>
+					<tr>
+						<th scope="row"><?php \esc_html_e( 'Supported post types', 'activitypub' ); ?></th>
+						<td>
+							<fieldset>
+								<?php \esc_html_e( 'Enable ActivityPub support for the following post types:', 'activitypub' ); ?>
+
+								<?php $post_types = \get_post_types( array( 'public' => true ), 'objects' ); ?>
+								<?php $support_post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) ? \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) : array(); ?>
+								<ul>
+								<?php // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited ?>
+								<?php foreach ( $post_types as $post_type ) { ?>
+									<li>
+										<input type="checkbox" id="activitypub_support_post_type_<?php echo \esc_attr( $post_type->name ); ?>" name="activitypub_support_post_types[]" value="<?php echo \esc_attr( $post_type->name ); ?>" <?php echo \checked( \in_array( $post_type->name, $support_post_types, true ) ); ?> />
+										<label for="activitypub_support_post_type_<?php echo \esc_attr( $post_type->name ); ?>"><?php echo \esc_html( $post_type->label ); ?></label>
+									</li>
+								<?php } ?>
+								</ul>
+							</fieldset>
+						</td>
+					</tr>
 					<tr>
 						<th scope="row">
 							<?php \esc_html_e( 'Hashtags (beta)', 'activitypub' ); ?>
@@ -217,93 +237,6 @@
 			<?php \do_settings_fields( 'activitypub', 'activity' ); ?>
 		</div>
 
-		<!-- OUR FORK HERE -->
-		<div class="box">
-		<h3><?php \esc_html_e( 'Enable ActivityPub support for post type', 'activitypub' ); ?></h3>
-
-		<table class="form-table">
-				<tbody>
-					<tr>
-						<th scope="row">
-							<?php \esc_html_e( 'Mapping', 'activitypub' ); ?>
-						</th>
-						<td>
-						<?php \esc_html_e( 'Enable ActivityPub support for a certain post type by selecting one of the available ActivityPub transformers.', 'activitypub' ); ?>
-
-				<?php $all_public_post_types = \get_post_types( array( 'public' => true ), 'objects' );
-				$transformer_mapping =  \get_option( 'activitypub_transformer_mapping', array( 'default' => 'note' ) );
-
-				$all_public_post_type_names = array_map(function ($object) {
-					return $object->name;
-				}, $all_public_post_types);
-
-				$transformer_manager = \Activitypub\Transformer\Transformers_Manager::instance();
-				$transformers = $transformer_manager->get_transformers();
-
-				?>
-
-
-				<script>
-					// TODO Probably we should use checkboxes and not select and make this less buggy and insert the js at the right place.
-					document.addEventListener('DOMContentLoaded', function () {
-						var radioGroups = {};
-
-						var radioButtons = document.querySelectorAll('input[type="radio"]');
-
-						radioButtons.forEach(function (radioButton) {
-							radioButton.addEventListener('click', function () {
-								var name = this.name;
-
-								if (!radioGroups[name]) {
-									radioGroups[name] = this;
-								} else {
-									radioGroups[name].checked = false;
-									radioGroups[name] = this;
-								}
-							});
-						});
-					});
-				</script>
-
-				<table>
-					<thead>
-					<tr>
-						<th></th>
-						<?php
-						// Generate column headers based on transformer objects
-						foreach ($transformers as $transformer) {
-							echo '<th>' . htmlspecialchars($transformer->get_label()) . '</th>';
-						}
-						?>
-					</tr>
-					</thead>
-					<tbody>
-					<?php
-					// Generate rows based on post types and transformers
-					foreach ($all_public_post_types as $post_type) {
-						echo '<tr>';
-						echo '<td><strong>' . htmlspecialchars($post_type->label) . '</strong></td>';
-						// Generate radio inputs for each transformer, considering support for the post type
-						foreach ($transformers as $transformer) {
-							$disabled_attribute = $transformer->supports_post_type( $post_type->name ) ? '' : ' disabled';
-							$is_selected = ( is_array( $transformer_mapping ) && isset( $transformer_mapping[ $post_type->name ] ) && $transformer_mapping[ $post_type->name ] === $transformer->get_name() ) ? ' checked ' : '';
-							echo '<td><input type="radio" name="activitypub_transformer_mapping[' . $post_type->name . ']" value="' . $transformer->get_name() . '"' . $is_selected . $disabled_attribute . '></td>';
-						}
-
-						echo '</tr>';
-					}
-					?>
-					</tbody>
-				</table>
-
-
-				</td>
-			</tr>
-				</tbody>
-				</table>
-		</div>
-		<!-- OUR FORK ENDS HERE -->
-
 		<div class="box">
 			<h3><?php \esc_html_e( 'Server', 'activitypub' ); ?></h3>
 			<table class="form-table">

templates/user-followers-list.php

@@ -14,8 +14,8 @@ $followers_template = _n( 'Your author profile currently has %s follower.', 'You
 		<input type="hidden" name="page" value="activitypub-followers-list" />
 		<?php
 		$table->prepare_items();
-		$table->search_box( 'Search', 'search' );
 		$table->display();
 		?>
+		<?php wp_nonce_field( 'activitypub-followers-list', '_apnonce' ); ?>
 		</form>
 </div>

tests/test-class-activitypub-activity.php

@@ -1,4 +1,6 @@
 <?php
+use DMS\PHPUnitExtensions\ArraySubset\Assert;
+
 class Test_Activitypub_Activity extends WP_UnitTestCase {
 	public function test_activity_mentions() {
 		$post = \wp_insert_post(
@@ -17,8 +19,7 @@ class Test_Activitypub_Activity extends WP_UnitTestCase {
 			10
 		);
 
-		$wp_post = get_post( $post );
-		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( $post )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Post::transform( get_post( $post ) )->to_object();
 
 		$activitypub_activity = new \Activitypub\Activity\Activity();
 		$activitypub_activity->set_type( 'Create' );
@@ -43,4 +44,21 @@ class Test_Activitypub_Activity extends WP_UnitTestCase {
 		$this->assertEquals( 'Hello world!', $object->get_content() );
 		$this->assertEquals( $test_array, $object->to_array() );
 	}
+
+	public function test_activity_object() {
+		$test_array = array(
+			'id'      => 'https://example.com/post/123',
+			'type'    => 'Create',
+			'object'  => array(
+				'id'      => 'https://example.com/post/123/activity',
+				'type'    => 'Note',
+				'content' => 'Hello world!',
+			),
+		);
+
+		$activity = \Activitypub\Activity\Activity::init_from_array( $test_array );
+
+		$this->assertEquals( 'Hello world!', $activity->get_object()->get_content() );
+		Assert::assertArraySubset( $test_array, $activity->to_array() );
+	}
 }

tests/test-class-activitypub-create-handler.php

@@ -0,0 +1,70 @@
+<?php
+class Test_Activitypub_Create_Handler extends WP_UnitTestCase {
+	public $user_id;
+	public $user_url;
+	public $post_id;
+	public $post_permalink;
+
+	public function set_up() {
+		$this->user_id = 1;
+		$authordata = \get_userdata( $this->user_id );
+		$this->user_url = $authordata->user_url;
+
+		$this->post_id = \wp_insert_post(
+			array(
+				'post_author' => $this->user_id,
+				'post_content' => 'test',
+			)
+		);
+		$this->post_permalink = \get_permalink( $this->post_id );
+
+		\add_filter( 'pre_get_remote_metadata_by_actor', array( '\Test_Activitypub_Create_Handler', 'get_remote_metadata_by_actor' ), 0, 2 );
+	}
+
+	public static function get_remote_metadata_by_actor( $value, $actor ) {
+		return array(
+			'name' => 'Example User',
+			'icon' => array(
+				'url' => 'https://example.com/icon',
+			),
+			'url'  => $actor,
+			'id'   => 'http://example.org/users/example',
+		);
+	}
+
+	public function create_test_object( $id = 'https://example.com/123' ) {
+		return array(
+			'actor' => $this->user_url,
+			'id' => 'https://example.com/id/' . microtime( true ),
+			'to' => [ $this->user_url ],
+			'cc' => [ 'https://www.w3.org/ns/activitystreams#Public' ],
+			'object' => array(
+				'id'        => $id,
+				'url'       => 'https://example.com/example',
+				'inReplyTo' => $this->post_permalink,
+				'content'   => 'example',
+			),
+		);
+	}
+
+	public function test_handle_create_object_unset_rejected() {
+		$object = $this->create_test_object();
+		unset( $object['object'] );
+		$converted = Activitypub\Handler\Create::handle_create( $object, $this->user_id );
+		$this->assertEquals( $converted->get_error_code(), 'activitypub_no_valid_object' );
+	}
+
+	public function test_handle_create_non_public_rejected() {
+		$object = $this->create_test_object();
+		$object['cc'] = [];
+		$converted = Activitypub\Handler\Create::handle_create( $object, $this->user_id );
+		$this->assertEquals( $converted->get_error_code(), 'activitypub_activity_not_public' );
+	}
+
+	public function test_handle_create_no_id_rejected() {
+		$object = $this->create_test_object();
+		unset( $object['object']['id'] );
+		$converted = Activitypub\Handler\Create::handle_create( $object, $this->user_id );
+		$this->assertEquals( $converted->get_error_code(), 'activitypub_no_valid_object' );
+	}
+}

tests/test-class-activitypub-followers.php

@@ -1,5 +1,5 @@
 <?php
-class Test_Db_Activitypub_Followers extends WP_UnitTestCase {
+class Test_Activitypub_Followers extends WP_UnitTestCase {
 	public static $users = array(
 		'username@example.org' => array(
 			'id' => 'https://example.org/users/username',

tests/test-class-activitypub-interactions.php

@@ -0,0 +1,112 @@
+<?php
+class Test_Activitypub_Interactions extends WP_UnitTestCase {
+	public $user_id;
+	public $user_url;
+	public $post_id;
+	public $post_permalink;
+
+	public function set_up() {
+		$this->user_id = 1;
+		$authordata = \get_userdata( $this->user_id );
+		$this->user_url = $authordata->user_url;
+
+		$this->post_id = \wp_insert_post(
+			array(
+				'post_author' => $this->user_id,
+				'post_content' => 'test',
+			)
+		);
+		$this->post_permalink = \get_permalink( $this->post_id );
+
+		\add_filter( 'pre_get_remote_metadata_by_actor', array( '\Test_Activitypub_Interactions', 'get_remote_metadata_by_actor' ), 0, 2 );
+	}
+
+	public static function get_remote_metadata_by_actor( $value, $actor ) {
+		return array(
+			'name' => 'Example User',
+			'icon' => array(
+				'url' => 'https://example.com/icon',
+			),
+			'url'  => $actor,
+			'id'   => 'http://example.org/users/example',
+		);
+	}
+
+	public function create_test_object( $id = 'https://example.com/123' ) {
+		return array(
+			'actor' => $this->user_url,
+			'id' => 'https://example.com/id/' . microtime( true ),
+			'to' => [ $this->user_url ],
+			'cc' => [ 'https://www.w3.org/ns/activitystreams#Public' ],
+			'object' => array(
+				'id'        => $id,
+				'url'       => 'https://example.com/example',
+				'inReplyTo' => $this->post_permalink,
+				'content'   => 'example',
+			),
+		);
+	}
+
+	public function test_handle_create_basic() {
+		$comment_id = Activitypub\Collection\Interactions::add_comment( $this->create_test_object() );
+		$comment   = get_comment( $comment_id, ARRAY_A );
+
+		$this->assertIsArray( $comment );
+		$this->assertEquals( $this->post_id, $comment['comment_post_ID'] );
+		$this->assertEquals( 'Example User', $comment['comment_author'] );
+		$this->assertEquals( $this->user_url, $comment['comment_author_url'] );
+		$this->assertEquals( 'example', $comment['comment_content'] );
+		$this->assertEquals( 'comment', $comment['comment_type'] );
+		$this->assertEquals( '', $comment['comment_author_email'] );
+		$this->assertEquals( 0, $comment['comment_parent'] );
+		$this->assertEquals( 'https://example.com/123', get_comment_meta( $comment_id, 'source_id', true ) );
+		$this->assertEquals( 'https://example.com/example', get_comment_meta( $comment_id, 'source_url', true ) );
+		$this->assertEquals( 'https://example.com/icon', get_comment_meta( $comment_id, 'avatar_url', true ) );
+		$this->assertEquals( 'activitypub', get_comment_meta( $comment_id, 'protocol', true ) );
+	}
+
+	public function test_convert_object_to_comment_not_reply_rejected() {
+		$object = $this->create_test_object();
+		unset( $object['object']['inReplyTo'] );
+		$converted = Activitypub\Collection\Interactions::add_comment( $object );
+		$this->assertEquals( $converted->get_error_code(), 'activitypub_no_reply' );
+	}
+
+	public function test_convert_object_to_comment_already_exists_rejected() {
+		$object = $this->create_test_object( 'https://example.com/test_convert_object_to_comment_already_exists_rejected' );
+		Activitypub\Collection\Interactions::add_comment( $object );
+		$converted = Activitypub\Collection\Interactions::add_comment( $object );
+		$this->assertEquals( $converted->get_error_code(), 'comment_duplicate' );
+	}
+
+	public function test_convert_object_to_comment_reply_to_comment() {
+		$id = 'https://example.com/test_convert_object_to_comment_reply_to_comment';
+		$object = $this->create_test_object( $id );
+		Activitypub\Collection\Interactions::add_comment( $object );
+		$comment = \Activitypub\object_id_to_comment( $id );
+
+		$object['object']['inReplyTo'] = $id;
+		$object['object']['id'] = 'https://example.com/234';
+		$id = Activitypub\Collection\Interactions::add_comment( $object );
+		$converted = get_comment( $id, ARRAY_A );
+
+		$this->assertIsArray( $converted );
+		$this->assertEquals( $this->post_id, $converted['comment_post_ID'] );
+		$this->assertEquals( $comment->comment_ID, $converted['comment_parent'] );
+	}
+
+	public function test_convert_object_to_comment_reply_to_non_existent_comment_rejected() {
+		$object = $this->create_test_object();
+		$object['object']['inReplyTo'] = 'https://example.com/not_found';
+		$converted = Activitypub\Collection\Interactions::add_comment( $object );
+		$this->assertEquals( $converted->get_error_code(), 'activitypub_no_reply' );
+	}
+
+	public function test_handle_create_basic2() {
+		$id = 'https://example.com/test_handle_create_basic';
+		$object = $this->create_test_object( $id );
+		Activitypub\Collection\Interactions::add_comment( $object );
+		$comment = \Activitypub\object_id_to_comment( $id );
+		$this->assertInstanceOf( WP_Comment::class, $comment );
+	}
+}

tests/test-class-activitypub-post.php

@@ -10,13 +10,13 @@ class Test_Activitypub_Post extends WP_UnitTestCase {
 
 		$permalink = \get_permalink( $post );
 
-		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( get_post( $post ) )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Post::transform( get_post( $post ) )->to_object();
 
 		$this->assertEquals( $permalink, $activitypub_post->get_id() );
 
 		\wp_trash_post( $post );
 
-		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( get_post( $post ) )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Post::transform( get_post( $post ) )->to_object();
 
 		$this->assertEquals( $permalink, $activitypub_post->get_id() );
 

tests/test-class-activitypub-rest-inbox.php

@@ -5,7 +5,7 @@ class Test_Activitypub_Rest_Inbox extends WP_UnitTestCase {
 	 */
 	public function test_is_activity_public( $data, $check ) {
 
-		$this->assertEquals( $check, Activitypub\Rest\Inbox::is_activity_public( $data ) );
+		$this->assertEquals( $check, Activitypub\is_activity_public( $data ) );
 	}
 
 	public function the_data_provider() {

tests/test-class-activitypub-rest-post-signature-verification.php

@@ -10,7 +10,7 @@ class Test_Activitypub_Signature_Verification extends WP_UnitTestCase {
 			)
 		);
 		$remote_actor = \get_author_posts_url( 2 );
-		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( get_post( $post ) )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Post::transform( get_post( $post ) )->to_object();
 		$activitypub_activity = new Activitypub\Activity\Activity( 'Create' );
 		$activitypub_activity->set_type( 'Create' );
 		$activitypub_activity->set_object( $activitypub_post );
@@ -82,7 +82,7 @@ class Test_Activitypub_Signature_Verification extends WP_UnitTestCase {
 		);
 		$remote_actor = \get_author_posts_url( 2 );
 		$remote_actor_inbox = Activitypub\get_rest_url_by_path( '/inbox' );
-		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( get_post( $post )  )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Post::transform( \get_post( $post ) )->to_object();
 		$activitypub_activity = new Activitypub\Activity\Activity();
 		$activitypub_activity->set_type( 'Create' );
 		$activitypub_activity->set_object( $activitypub_post );

tests/test-functions.php

@@ -1,9 +1,80 @@
 <?php
 class Test_Functions extends ActivityPub_TestCase_Cache_HTTP {
+	public $user_id;
+	public $post_id;
+
 	public function test_get_remote_metadata_by_actor() {
 		$metadata = \ActivityPub\get_remote_metadata_by_actor( 'pfefferle@notiz.blog' );
 		$this->assertEquals( 'https://notiz.blog/author/matthias-pfefferle/', $metadata['url'] );
 		$this->assertEquals( 'pfefferle', $metadata['preferredUsername'] );
 		$this->assertEquals( 'Matthias Pfefferle', $metadata['name'] );
 	}
+
+	public function set_up() {
+		$this->post_id = \wp_insert_post(
+			array(
+				'post_author' => $this->user_id,
+				'post_content' => 'test',
+			)
+		);
+	}
+
+	public function test_object_id_to_comment_basic() {
+		$single_comment_source_id = 'https://example.com/single';
+		$content = 'example';
+		$comment_id = \wp_new_comment(
+			array(
+				'comment_post_ID' => $this->post_id,
+				'comment_author' => 'Example User',
+				'comment_author_url' => 'https://example.com/user',
+				'comment_content' => $content,
+				'comment_type' => '',
+				'comment_author_email' => '',
+				'comment_parent' => 0,
+				'comment_meta' => array(
+					'source_id' => $single_comment_source_id,
+					'source_url' => 'https://example.com/123',
+					'avatar_url' => 'https://example.com/icon',
+					'protocol' => 'activitypub',
+				),
+			),
+			true
+		);
+		$query_result = \Activitypub\object_id_to_comment( $single_comment_source_id );
+		$this->assertInstanceOf( WP_Comment::class, $query_result );
+		$this->assertEquals( $comment_id, $query_result->comment_ID );
+		$this->assertEquals( $content, $query_result->comment_content );
+	}
+
+	public function test_object_id_to_comment_none() {
+		$single_comment_source_id = 'https://example.com/none';
+		$query_result = \Activitypub\object_id_to_comment( $single_comment_source_id );
+		$this->assertFalse( $query_result );
+	}
+
+	public function test_object_id_to_comment_duplicate() {
+		$duplicate_comment_source_id = 'https://example.com/duplicate';
+		for ( $i = 0; $i < 2; ++$i ) {
+			\wp_new_comment(
+				array(
+					'comment_post_ID' => $this->post_id,
+					'comment_author' => 'Example User',
+					'comment_author_url' => 'https://example.com/user',
+					'comment_content' => 'example',
+					'comment_type' => '',
+					'comment_author_email' => '',
+					'comment_parent' => 0,
+					'comment_meta' => array(
+						'source_id' => $duplicate_comment_source_id,
+						'source_url' => 'https://example.com/123',
+						'avatar_url' => 'https://example.com/icon',
+						'protocol' => 'activitypub',
+					),
+				),
+				true
+			);
+		}
+		$query_result = \Activitypub\object_id_to_comment( $duplicate_comment_source_id );
+		$this->assertFalse( $query_result );
+	}
 }