fix phpcs via phpcbf

fix phpdocs and some readability
move transofmrer function get_post_content_template to base class
2023-11-25 10:43:08 +01:00 · 2023-11-25 10:38:22 +01:00 · 2023-11-25 10:37:54 +01:00 · 2023-11-25 10:37:00 +01:00 · 2023-11-25 10:32:44 +01:00 · 2023-11-25 10:31:40 +01:00
44 changed files with 1567 additions and 606 deletions
--- a/README.md
+++ b/README.md
@ -2,8 +2,8 @@
 **Contributors:** [automattic](https://profiles.wordpress.org/automattic/), [pfefferle](https://profiles.wordpress.org/pfefferle/), [mediaformat](https://profiles.wordpress.org/mediaformat/), [mattwiebe](https://profiles.wordpress.org/mattwiebe/), [akirk](https://profiles.wordpress.org/akirk/), [jeherve](https://profiles.wordpress.org/jeherve/), [nuriapena](https://profiles.wordpress.org/nuriapena/), [cavalierlife](https://profiles.wordpress.org/cavalierlife/)  
 **Tags:** OStatus, fediverse, activitypub, activitystream  
 **Requires at least:** 4.7  
-**Tested up to:** 6.3  
-**Stable tag:** 1.0.7  
+**Tested up to:** 6.4  
+**Stable tag:** 1.2.0  
 **Requires PHP:** 5.6  
 **License:** MIT  
 **License URI:** http://opensource.org/licenses/MIT  
@ -105,6 +105,45 @@ 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!
+* Improved: better error messages if remote profile is not accessible
+* Improved: PHP 8.1 compatibility
+* Fixed: don't try to parse mentions or hashtags for very large (>1MB) posts to prevent timeouts
+* Fixed: better handling of ISO-639-1 locale codes
+* Improved: more reliable [ap_author], props @uk3
+* Improved: NodeInfo statistics
+
+### 1.0.10 ###
+
+* Improved: better error messages if remote profile is not accessible
+
+### 1.0.9 ###
+
+* Fixed: broken following endpoint
+
+### 1.0.8 ###
+
+* Fixed: blocking of HEAD requests
+* Fixed: PHP fatal error
+* Fixed: several typos
+* Fixed: error codes
+* Improved: loading of shortcodes
+* Updated: caching of followers
+* Updated: Application-User is no longer "indexable"
+* Updated: more consistent usage of the `application/activity+json` Content-Type
+* Removed: featured tags endpoint
+
 ### 1.0.7 ###

 * Fixed: broken function call
@ -210,7 +249,7 @@ Project maintained on GitHub at [automattic/wordpress-activitypub](https://githu
 * Use shortcodes instead of custom templates, to setup the Activity Post-Content ([#250](https://github.com/pfefferle/wordpress-activitypub/pull/250)) props [@toolstack](https://github.com/toolstack)
 * Remove custom REST Server, because the needed changes are now merged into Core.
 * Fix hashtags ([#261](https://github.com/pfefferle/wordpress-activitypub/pull/261)) props [@akirk](https://github.com/akirk)
-* Change priorities, to maybe fix the hashtag issue
+* Change priorites, to maybe fix the hashtag issue

 ### 0.15.0 ###

--- a/activitypub.php
+++ b/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: 1.0.7
+ * Version: 1.2.0
 * Author: Matthias Pfefferle & Automattic
 * Author URI: https://automattic.com/
 * License: MIT
@ -33,12 +33,15 @@ 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.
 */
--- a/build/follow-me/style-index.css
+++ b/build/follow-me/style-index.css
@ -1 +1 @@
-.activitypub-follow-me-block-wrapper{width:100%}.activitypub-follow-me-block-wrapper.has-background .activitypub-profile,.activitypub-follow-me-block-wrapper.has-border-color .activitypub-profile{padding-left:1rem;padding-right:1rem}.activitypub-follow-me-block-wrapper .activitypub-profile{align-items:center;display:flex;padding:1rem 0}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__avatar{border-radius:50%;height:75px;margin-right:1rem;width:75px}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__content{flex:1;min-width:0}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__handle,.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__name{line-height:1.2;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__name{font-size:1.25em}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__follow{align-self:center;background-color:var(--wp--preset--color--black);color:var(--wp--preset--color--white);margin-left:1rem}.activitypub-profile__confirm.components-modal__frame{background-color:#f7f7f7;color:#333}.activitypub-profile__confirm.components-modal__frame .components-modal__header-heading,.activitypub-profile__confirm.components-modal__frame h4{color:#333;letter-spacing:inherit;word-spacing:inherit}.activitypub-follow-me__dialog{max-width:30em}.activitypub-follow-me__dialog h4{line-height:1;margin:0}.activitypub-follow-me__dialog .apmfd__section{margin-bottom:2em}.activitypub-follow-me__dialog .apfmd-description{font-size:var(--wp--preset--font-size--normal,.75rem);margin:.33em 0 1em}.activitypub-follow-me__dialog .apfmd__button-group{display:flex;justify-content:flex-end}.activitypub-follow-me__dialog .apfmd__button-group svg{height:21px;margin-right:.5em;width:21px}.activitypub-follow-me__dialog .apfmd__button-group input{flex:1;padding-left:1em;padding-right:1em}
+.activitypub-follow-me-block-wrapper{width:100%}.activitypub-follow-me-block-wrapper.has-background .activitypub-profile,.activitypub-follow-me-block-wrapper.has-border-color .activitypub-profile{padding-left:1rem;padding-right:1rem}.activitypub-follow-me-block-wrapper .activitypub-profile{align-items:center;display:flex;padding:1rem 0}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__avatar{border-radius:50%;height:75px;margin-right:1rem;width:75px}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__content{flex:1;min-width:0}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__handle,.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__name{line-height:1.2;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__name{font-size:1.25em}.activitypub-follow-me-block-wrapper .activitypub-profile .activitypub-profile__follow{align-self:center;background-color:var(--wp--preset--color--black);color:var(--wp--preset--color--white);margin-left:1rem}.activitypub-profile__confirm.components-modal__frame{background-color:#f7f7f7;color:#333}.activitypub-profile__confirm.components-modal__frame .components-modal__header-heading,.activitypub-profile__confirm.components-modal__frame h4{color:#333;letter-spacing:inherit;word-spacing:inherit}.activitypub-follow-me__dialog{max-width:30em}.activitypub-follow-me__dialog h4{line-height:1;margin:0}.activitypub-follow-me__dialog .apmfd__section{margin-bottom:2em}.activitypub-follow-me__dialog .apfmd-description{font-size:var(--wp--preset--font-size--normal,.75rem);margin:.33em 0 1em}.activitypub-follow-me__dialog .apfmd__button-group{align-items:flex-end;display:flex;justify-content:flex-end}.activitypub-follow-me__dialog .apfmd__button-group svg{height:21px;margin-right:.5em;width:21px}.activitypub-follow-me__dialog .apfmd__button-group input{background-color:var(--wp--preset--color--white);border:1px solid var(--wp--preset--color--black);color:var(--wp--preset--color--black);flex:1;padding:6px 12px}
--- a/includes/activity/class-event.php
+++ b/includes/activity/class-event.php
@ -0,0 +1,23 @@
+<?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';
+}
--- a/includes/activity/class-note.php
+++ b/includes/activity/class-note.php
@ -0,0 +1,23 @@
+<?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';
+}
--- a/includes/class-activity-dispatcher.php
+++ b/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\Post;
+use Activitypub\Transformer\Transformers_Manager;

 use function Activitypub\is_single_user;
 use function Activitypub\is_user_disabled;
@ -65,7 +65,8 @@ class Activity_Dispatcher {
 			return;
 		}

-		$object = Post::transform( $wp_post )->to_object();
+		$transformer = Transformers_Manager::instance()->get_transformer( $wp_post );
+		$object = $transformer->to_object();

 		$activity = new Activity();
 		$activity->set_type( $type );
@ -101,7 +102,8 @@ class Activity_Dispatcher {
 			return;
 		}

-		$object = Post::transform( $wp_post )->to_object();
+		$transformer = Transformers_Manager::instance()->get_transformer( $wp_post );
+		$object = $transformer->to_object();

 		$activity = new Activity();
 		$activity->set_type( 'Announce' );
--- a/includes/class-activitypub.php
+++ b/includes/class-activitypub.php
@ -20,9 +20,9 @@ class Activitypub {
 		\add_filter( 'get_comment_link', array( self::class, 'remote_comment_link' ), 11, 3 );

 		// Add support for ActivityPub to custom post types
-		$post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) ? \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) : array();
+		$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();

-		foreach ( $post_types as $post_type ) {
+		foreach ( array_keys( $transformer_mapping ) as $post_type ) {
 			\add_post_type_support( $post_type, 'activitypub' );
 		}

--- a/includes/class-admin.php
+++ b/includes/class-admin.php
@ -3,6 +3,7 @@ namespace Activitypub;

 use WP_User_Query;
 use Activitypub\Model\Blog_User;
+use Activitypub\Base\Transformer\Base as Transformer_Base;

 /**
 * ActivityPub Admin Class
@ -22,6 +23,15 @@ 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
+		);
 	}

 	/**
@ -154,14 +164,47 @@ class Admin {
 				'default' => '0',
 			)
 		);
-		\register_setting(
+
+		/**
+		 * 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(
 			'activitypub',
-			'activitypub_support_post_types',
+			'activitypub_transformer_mapping',
 			array(
-				'type'         => 'string',
-				'description'  => \esc_html__( 'Enable ActivityPub support for post types', 'activitypub' ),
-				'show_in_rest' => true,
-				'default'      => array( 'post', 'pages' ),
+				'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;
+				},
 			)
 		);
 		\register_setting(
--- a/includes/class-hashtag.php
+++ b/includes/class-hashtag.php
@ -43,6 +43,10 @@ class Hashtag {
 	 * @return string the filtered post-content
 	 */
 	public static function the_content( $the_content ) {
+		// small protection against execution timeouts: limit to 1 MB
+		if ( mb_strlen( $the_content ) > MB_IN_BYTES ) {
+			return $the_content;
+		}
 		$tag_stack = array();
 		$protected_tags = array(
 			'pre',
--- a/includes/class-mention.php
+++ b/includes/class-mention.php
@ -26,6 +26,10 @@ class Mention {
 	 * @return string the filtered post-content
 	 */
 	public static function the_content( $the_content ) {
+		// small protection against execution timeouts: limit to 1 MB
+		if ( mb_strlen( $the_content ) > MB_IN_BYTES ) {
+			return $the_content;
+		}
 		$tag_stack = array();
 		$protected_tags = array(
 			'pre',
--- a/includes/class-migration.php
+++ b/includes/class-migration.php
@ -4,6 +4,7 @@ namespace Activitypub;
 use Activitypub\Activitypub;
 use Activitypub\Model\Blog_User;
 use Activitypub\Collection\Followers;
+use Activitypub\Admin;

 /**
 * ActivityPub Migration Class
@ -114,12 +115,30 @@ 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
 	 *
--- a/includes/class-scheduler.php
+++ b/includes/class-scheduler.php
@ -4,7 +4,6 @@ namespace Activitypub;

 use Activitypub\Collection\Users;
 use Activitypub\Collection\Followers;
-use Activitypub\Transformer\Post;

 /**
 * ActivityPub Scheduler Class
--- a/includes/class-shortcodes.php
+++ b/includes/class-shortcodes.php
@ -390,7 +390,8 @@ class Shortcodes {
 			return '';
 		}

-		$name = \get_the_author_meta( 'display_name', $item->post_author );
+		$author_id = \get_post_field( 'post_author', $item->ID );
+		$name = \get_the_author_meta( 'display_name', $author_id );

 		if ( ! $name ) {
 			return '';
@ -415,7 +416,8 @@ class Shortcodes {
 			return '';
 		}

-		$url = \get_the_author_meta( 'user_url', $item->post_author );
+		$author_id = \get_post_field( 'post_author', $item->ID );
+		$url = \get_the_author_meta( 'user_url', $author_id );

 		if ( ! $url ) {
 			return '';
--- a/includes/class-signature.php
+++ b/includes/class-signature.php
@ -4,6 +4,7 @@ namespace Activitypub;
 use WP_Error;
 use DateTime;
 use DateTimeZone;
+use WP_REST_Request;
 use Activitypub\Collection\Users;

 /**
@ -226,7 +227,7 @@ class Signature {
 	/**
 	 * Verifies the http signatures
 	 *
-	 * @param WP_REQUEST|array $request The request object or $_SERVER array.
+	 * @param WP_REST_Request|array $request The request object or $_SERVER array.
 	 *
 	 * @return mixed A boolean or WP_Error.
 	 */
@ -259,7 +260,7 @@ class Signature {
 		}

 		if ( ! isset( $headers['signature'] ) ) {
-			return new WP_Error( 'activitypub_signature', __( 'Request not signed', 'activitypub' ), array( 'status' => 403 ) );
+			return new WP_Error( 'activitypub_signature', __( 'Request not signed', 'activitypub' ), array( 'status' => 401 ) );
 		}

 		if ( array_key_exists( 'signature', $headers ) ) {
@ -269,7 +270,7 @@ class Signature {
 		}

 		if ( ! isset( $signature_block ) || ! $signature_block ) {
-			return new WP_Error( 'activitypub_signature', __( 'Incompatible request signature. keyId and signature are required', 'activitypub' ), array( 'status' => 403 ) );
+			return new WP_Error( 'activitypub_signature', __( 'Incompatible request signature. keyId and signature are required', 'activitypub' ), array( 'status' => 401 ) );
 		}

 		$signed_headers = $signature_block['headers'];
@ -279,12 +280,12 @@ class Signature {

 		$signed_data = self::get_signed_data( $signed_headers, $signature_block, $headers );
 		if ( ! $signed_data ) {
-			return new WP_Error( 'activitypub_signature', __( 'Signed request date outside acceptable time window', 'activitypub' ), array( 'status' => 403 ) );
+			return new WP_Error( 'activitypub_signature', __( 'Signed request date outside acceptable time window', 'activitypub' ), array( 'status' => 401 ) );
 		}

 		$algorithm = self::get_signature_algorithm( $signature_block );
 		if ( ! $algorithm ) {
-			return new WP_Error( 'activitypub_signature', __( 'Unsupported signature algorithm (only rsa-sha256 and hs2019 are supported)', 'activitypub' ), array( 'status' => 403 ) );
+			return new WP_Error( 'activitypub_signature', __( 'Unsupported signature algorithm (only rsa-sha256 and hs2019 are supported)', 'activitypub' ), array( 'status' => 401 ) );
 		}

 		if ( \in_array( 'digest', $signed_headers, true ) && isset( $body ) ) {
@ -300,7 +301,7 @@ class Signature {
 			}

 			if ( \base64_encode( \hash( $hashalg, $body, true ) ) !== $digest[1] ) { // phpcs:ignore
-				return new WP_Error( 'activitypub_signature', __( 'Invalid Digest header', 'activitypub' ), array( 'status' => 403 ) );
+				return new WP_Error( 'activitypub_signature', __( 'Invalid Digest header', 'activitypub' ), array( 'status' => 401 ) );
 			}
 		}

@ -313,7 +314,7 @@ class Signature {
 		$verified = \openssl_verify( $signed_data, $signature_block['signature'], $public_key, $algorithm ) > 0;

 		if ( ! $verified ) {
-			return new WP_Error( 'activitypub_signature', __( 'Invalid signature', 'activitypub' ), array( 'status' => 403 ) );
+			return new WP_Error( 'activitypub_signature', __( 'Invalid signature', 'activitypub' ), array( 'status' => 401 ) );
 		}
 		return $verified;
 	}
@ -323,17 +324,25 @@ class Signature {
 	 *
 	 * @param string $key_id The URL to the public key.
 	 *
-	 * @return WP_Error|string The public key.
+	 * @return WP_Error|string The public key or WP_Error.
 	 */
 	public static function get_remote_key( $key_id ) { // phpcs:ignore
 		$actor = get_remote_metadata_by_actor( strip_fragment_from_url( $key_id ) ); // phpcs:ignore
 		if ( \is_wp_error( $actor ) ) {
-			return $actor;
+			return new WP_Error(
+				'activitypub_no_remote_profile_found',
+				__( 'No Profile found or Profile not accessible', 'activitypub' ),
+				array( 'status' => 401 )
+			);
 		}
 		if ( isset( $actor['publicKey']['publicKeyPem'] ) ) {
 			return \rtrim( $actor['publicKey']['publicKeyPem'] ); // phpcs:ignore
 		}
-		return new WP_Error( 'activitypub_no_remote_key_found', __( 'No Public-Key found', 'activitypub' ), array( 'status' => 403 ) );
+		return new WP_Error(
+			'activitypub_no_remote_key_found',
+			__( 'No Public-Key found', 'activitypub' ),
+			array( 'status' => 401 )
+		);
 	}

 	/**
--- a/includes/class-webfinger.php
+++ b/includes/class-webfinger.php
@ -41,9 +41,14 @@ 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 );
--- a/includes/compat.php
+++ b/includes/compat.php
@ -35,3 +35,15 @@ if ( ! function_exists( 'get_self_link' ) ) {
 		return esc_url( apply_filters( 'self_link', set_url_scheme( 'http://' . $host['host'] . $path ) ) );
 	}
 }
+
+if ( ! function_exists( 'is_countable' ) ) {
+	/**
+	 * Polyfill for `is_countable()` function added in PHP 7.3.
+	 *
+	 * @param mixed $value The value to check.
+	 * @return bool True if `$value` is countable, otherwise false.
+	 */
+	function is_countable( $value ) {
+			return is_array( $value ) || $value instanceof \Countable;
+	}
+}
--- a/includes/functions.php
+++ b/includes/functions.php
@ -5,6 +5,7 @@ use WP_Error;
 use Activitypub\Http;
 use Activitypub\Activity\Activity;
 use Activitypub\Collection\Followers;
+use Activitypub\Collection\Users;

 /**
 * Returns the ActivityPub default JSON-context
@ -42,7 +43,7 @@ function get_webfinger_resource( $user_id ) {
 * @param string $actor  The Actor URL.
 * @param bool   $cached If the result should be cached.
 *
- * @return array The Actor profile as array
+ * @return array|WP_Error The Actor profile as array or WP_Error on failure.
 */
 function get_remote_metadata_by_actor( $actor, $cached = true ) {
 	$pre = apply_filters( 'pre_get_remote_metadata_by_actor', false, $actor );
@ -278,6 +279,16 @@ 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;
@ -474,3 +485,75 @@ function is_json( $data ) {
 function is_blog_public() {
 	return (bool) apply_filters( 'activitypub_is_blog_public', \get_option( 'blog_public', 1 ) );
 }
+
+/**
+ * Get active users based on a given duration
+ *
+ * @param int $duration The duration to check in month(s)
+ *
+ * @return int The number of active users
+ */
+function get_active_users( $duration = 1 ) {
+
+	$duration = intval( $duration );
+	$transient_key = sprintf( 'monthly_active_users_%d', $duration );
+	$count = get_transient( $transient_key );
+
+	if ( false === $count ) {
+		global $wpdb;
+		$query = "SELECT COUNT( DISTINCT post_author ) FROM {$wpdb->posts} WHERE post_type = 'post' AND post_status = 'publish' AND post_date <= DATE_SUB( NOW(), INTERVAL %d MONTH )";
+		$query = $wpdb->prepare( $query, $duration );
+		$count = $wpdb->get_var( $query ); // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
+
+		set_transient( $transient_key, $count, DAY_IN_SECONDS );
+	}
+
+	// if 0 authors where active
+	if ( 0 === $count ) {
+		return 0;
+	}
+
+	// if single user mode
+	if ( is_single_user() ) {
+		return 1;
+	}
+
+	// if blog user is disabled
+	if ( is_user_disabled( Users::BLOG_USER_ID ) ) {
+		return $count;
+	}
+
+	// also count blog user
+	return $count + 1;
+}
+
+/**
+ * Get the total number of users
+ *
+ * @return int The total number of users
+ */
+function get_total_users() {
+	// if single user mode
+	if ( is_single_user() ) {
+		return 1;
+	}
+
+	$users = \get_users(
+		array(
+			'capability__in' => array( 'publish_posts' ),
+		)
+	);
+
+	if ( is_array( $users ) ) {
+		$users = count( $users );
+	} else {
+		$users = 1;
+	}
+
+	// if blog user is disabled
+	if ( is_user_disabled( Users::BLOG_USER_ID ) ) {
+		return $users;
+	}
+
+	return $users + 1;
+}
--- a/includes/model/class-application-user.php
+++ b/includes/model/class-application-user.php
@ -58,10 +58,6 @@ class Application_User extends Blog_User {
 		return null;
 	}

-	public function get_featured_tags() {
-		return null;
-	}
-
 	public function get_featured() {
 		return null;
 	}
--- a/includes/model/class-follower.php
+++ b/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_published ) ) );
+		$object->set_published( gmdate( 'Y-m-d H:i:s', strtotime( $post->post_date ) ) );
 		$object->set_updated( gmdate( 'Y-m-d H:i:s', strtotime( $post->post_modified ) ) );

 		return $object;
--- a/includes/model/class-post.php
+++ b/includes/model/class-post.php
@ -1,7 +1,7 @@
 <?php
 namespace Activitypub\Model;

-use Activitypub\Transformer\Post as Post_Transformer;
+use Activitypub\Transformer\Post as Transformer_Post;

 /**
 * ActivityPub Post Class
@ -33,8 +33,9 @@ class Post {
 	public function __construct( $post, $post_author = null ) {
 		_deprecated_function( __CLASS__, '1.0.0', '\Activitypub\Transformer\Post' );

-		$this->post   = $post;
-		$this->object = Post_Transformer::transform( $post )->to_object();
+		$this->post = $post;
+		$transformer = new Transformer_Post();
+		$this->object = $transformer->set_wp_post( $post )->to_object();
 	}

 	/**
--- a/includes/model/class-user.php
+++ b/includes/model/class-user.php
@ -18,15 +18,6 @@ class User extends Actor {
 	 */
 	protected $_id; // phpcs:ignore PSR2.Classes.PropertyDeclaration.Underscore

-	/**
-	 * The Featured-Tags.
-	 *
-	 * @see https://docs.joinmastodon.org/spec/activitypub/#featuredTags
-	 *
-	 * @var string
-	 */
-	protected $featured_tags;
-
 	/**
 	 * The Featured-Posts.
 	 *
@ -235,15 +226,6 @@ class User extends Actor {
 		return get_rest_url_by_path( sprintf( 'users/%d/collections/featured', $this->get__id() ) );
 	}

-	/**
-	 * Returns the Featured-Tags-API-Endpoint.
-	 *
-	 * @return string The Featured-Tags-Endpoint.
-	 */
-	public function get_featured_tags() {
-		return get_rest_url_by_path( sprintf( 'users/%d/collections/tags', $this->get__id() ) );
-	}
-
 	/**
 	 * Extend the User-Output with Attachments.
 	 *
--- a/includes/rest/class-collection.php
+++ b/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\Post;
+use Activitypub\Transformer\Transformers_Manager;
 use Activitypub\Activity\Activity;
 use Activitypub\Collection\Users as User_Collection;

@ -105,7 +105,7 @@ class Collection {
 			'@context'   => Activity::CONTEXT,
 			'id'         => get_rest_url_by_path( sprintf( 'users/%d/collections/tags', $user->get__id() ) ),
 			'type'       => 'Collection',
-			'totalItems' => count( $tags ),
+			'totalItems' => is_countable( $tags ) ? count( $tags ) : 0,
 			'items'      => array(),
 		);

@ -117,7 +117,10 @@ class Collection {
 			);
 		}

-		return new WP_REST_Response( $response, 200 );
+		$rest_response = new WP_REST_Response( $response, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
+
+		return $rest_response;
 	}

 	/**
@ -160,15 +163,18 @@ class Collection {
 			'@context'     => Activity::CONTEXT,
 			'id'           => get_rest_url_by_path( sprintf( 'users/%d/collections/featured', $user_id ) ),
 			'type'         => 'OrderedCollection',
-			'totalItems'   => count( $posts ),
+			'totalItems'   => is_countable( $posts ) ? count( $posts ) : 0,
 			'orderedItems' => array(),
 		);

 		foreach ( $posts as $post ) {
-			$response['orderedItems'][] = Post::transform( $post )->to_object()->to_array();
+			$response['orderedItems'][] = Transformers_Manager::instance()->get_transformer( $post )->to_object()->to_array();
 		}

-		return new WP_REST_Response( $response, 200 );
+		$rest_response = new WP_REST_Response( $response, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
+
+		return $rest_response;
 	}

 	/**
@ -192,7 +198,10 @@ class Collection {
 			$response['orderedItems'][] = $user->get_url();
 		}

-		return new WP_REST_Response( $response, 200 );
+		$rest_response = new WP_REST_Response( $response, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
+
+		return $rest_response;
 	}

 	/**
--- a/includes/rest/class-followers.php
+++ b/includes/rest/class-followers.php
@ -103,10 +103,10 @@ class Followers {
 			$data['followers']
 		);

-		$response = new WP_REST_Response( $json, 200 );
-		$response->header( 'Content-Type', 'application/activity+json' );
+		$rest_response = new WP_REST_Response( $json, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );

-		return $response;
+		return $rest_response;
 	}

 	/**
--- a/includes/rest/class-following.php
+++ b/includes/rest/class-following.php
@ -1,6 +1,7 @@
 <?php
 namespace Activitypub\Rest;

+use WP_REST_Response;
 use Activitypub\Collection\Users as User_Collection;

 use function Activitypub\is_single_user;
@ -74,15 +75,15 @@ class Following {

 		$items = apply_filters( 'activitypub_rest_following', array(), $user ); // phpcs:ignore

-		$json->totalItems = count( $items ); // phpcs:ignore
+		$json->totalItems = is_countable( $items ) ? count( $items ) : 0; // phpcs:ignore
 		$json->orderedItems = $items; // phpcs:ignore

 		$json->first = $json->partOf; // phpcs:ignore

-		$response = new \WP_REST_Response( $json, 200 );
-		$response->header( 'Content-Type', 'application/activity+json' );
+		$rest_response = new WP_REST_Response( $json, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );

-		return $response;
+		return $rest_response;
 	}

 	/**
--- a/includes/rest/class-inbox.php
+++ b/includes/rest/class-inbox.php
@ -109,11 +109,10 @@ class Inbox {
 		 */
 		\do_action( 'activitypub_inbox_post' );

-		$response = new WP_REST_Response( $json, 200 );
+		$rest_response = new WP_REST_Response( $json, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );

-		$response->header( 'Content-Type', 'application/activity+json' );
-
-		return $response;
+		return $rest_response;
 	}

 	/**
@ -138,7 +137,10 @@ class Inbox {
 		\do_action( 'activitypub_inbox', $data, $user->get__id(), $type );
 		\do_action( "activitypub_inbox_{$type}", $data, $user->get__id() );

-		return new WP_REST_Response( array(), 202 );
+		$rest_response = new WP_REST_Response( array(), 202 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
+
+		return $rest_response;
 	}

 	/**
@ -158,7 +160,7 @@ class Inbox {
 				'rest_invalid_param',
 				\__( 'No recipients found', 'activitypub' ),
 				array(
-					'status' => 404,
+					'status' => 400,
 					'params' => array(
 						'to' => \__( 'Please check/validate "to" field', 'activitypub' ),
 						'bto' => \__( 'Please check/validate "bto" field', 'activitypub' ),
@ -183,7 +185,10 @@ class Inbox {
 			\do_action( "activitypub_inbox_{$type}", $data, $user->ID );
 		}

-		return new WP_REST_Response( array(), 202 );
+		$rest_response = new WP_REST_Response( array(), 202 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
+
+		return $rest_response;
 	}

 	/**
@ -231,8 +236,12 @@ class Inbox {
 		$params['actor'] = array(
 			'required' => true,
 			'sanitize_callback' => function( $param, $request, $key ) {
-				if ( ! \is_string( $param ) ) {
-					$param = $param['id'];
+				if ( \is_array( $param ) ) {
+					if ( isset( $param['id'] ) ) {
+						$param = $param['id'];
+					} else {
+						$param = $param['url'];
+					}
 				}
 				return \esc_url_raw( $param );
 			},
@ -361,7 +370,7 @@ class Inbox {
 			'comment_post_ID' => $comment_post_id,
 			'comment_author' => \esc_attr( $meta['name'] ),
 			'comment_author_url' => \esc_url_raw( $object['actor'] ),
-			'comment_content' => \wp_filter_kses( $object['object']['content'] ),
+			'comment_content' => addslashes( \wp_kses( $object['object']['content'], 'pre_comment_content' ) ),
 			'comment_type' => 'comment',
 			'comment_author_email' => '',
 			'comment_parent' => 0,
@ -386,8 +395,11 @@ class Inbox {
 			}
 		);

+		\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
@ -478,4 +490,29 @@ class Inbox {

 		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;
+	}
 }
--- a/includes/rest/class-nodeinfo.php
+++ b/includes/rest/class-nodeinfo.php
@ -3,6 +3,8 @@ namespace Activitypub\Rest;

 use WP_REST_Response;

+use function Activitypub\get_total_users;
+use function Activitypub\get_active_users;
 use function Activitypub\get_rest_url_by_path;

 /**
@ -82,24 +84,14 @@ class Nodeinfo {
 			'version' => \get_bloginfo( 'version' ),
 		);

-		$users = \get_users(
-			array(
-				'capability__in' => array( 'publish_posts' ),
-			)
-		);
-
-		if ( is_array( $users ) ) {
-			$users = count( $users );
-		} else {
-			$users = 1;
-		}
-
 		$posts = \wp_count_posts();
 		$comments = \wp_count_comments();

 		$nodeinfo['usage'] = array(
 			'users' => array(
-				'total' => $users,
+				'total'          => get_total_users(),
+				'activeMonth'    => get_active_users( '1 month ago' ),
+				'activeHalfyear' => get_active_users( '6 month ago' ),
 			),
 			'localPosts' => (int) $posts->publish,
 			'localComments' => (int) $comments->approved,
@ -139,24 +131,14 @@ class Nodeinfo {
 			'version' => \get_bloginfo( 'version' ),
 		);

-		$users = \get_users(
-			array(
-				'capability__in' => array( 'publish_posts' ),
-			)
-		);
-
-		if ( is_array( $users ) ) {
-			$users = count( $users );
-		} else {
-			$users = 1;
-		}
-
 		$posts = \wp_count_posts();
 		$comments = \wp_count_comments();

 		$nodeinfo['usage'] = array(
 			'users' => array(
-				'total' => (int) $users,
+				'total'          => get_total_users(),
+				'activeMonth'    => get_active_users( 1 ),
+				'activeHalfyear' => get_active_users( 6 ),
 			),
 			'localPosts' => (int) $posts->publish,
 			'localComments' => (int) $comments->approved,
--- a/includes/rest/class-outbox.php
+++ b/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\Post;
+use Activitypub\Transformer\Transformers_Manager;
 use Activitypub\Activity\Activity;
 use Activitypub\Collection\Users as User_Collection;

@ -59,7 +59,7 @@ class Outbox {
 			return $user;
 		}

-		$post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) );
+		$post_types = array_keys( \get_option( 'activitypub_transformer_mapping', array( 'post' => 'activitypub/default', 'page' => 'activitypub/default' ) ) );

 		$page = $request->get_param( 'page', 1 );

@ -105,7 +105,8 @@ class Outbox {
 			);

 			foreach ( $posts as $post ) {
-				$post = Post::transform( $post )->to_object();
+				$transformer = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( $post );
+				$post = $transformer->to_object();
 				$activity = new Activity();
 				$activity->set_type( 'Create' );
 				$activity->set_context( null );
@ -123,11 +124,10 @@ class Outbox {
 		 */
 		\do_action( 'activitypub_outbox_post' );

-		$response = new WP_REST_Response( $json, 200 );
+		$rest_response = new WP_REST_Response( $json, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );

-		$response->header( 'Content-Type', 'application/activity+json' );
-
-		return $response;
+		return $rest_response;
 	}

 	/**
--- a/includes/rest/class-server.php
+++ b/includes/rest/class-server.php
@ -2,6 +2,7 @@
 namespace Activitypub\Rest;

 use stdClass;
+use WP_Error;
 use WP_REST_Response;
 use Activitypub\Signature;
 use Activitypub\Model\Application_User;
@ -54,11 +55,10 @@ class Server {

 		$json = $user->to_array();

-		$response = new WP_REST_Response( $json, 200 );
+		$rest_response = new WP_REST_Response( $json, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );

-		$response->header( 'Content-Type', 'application/activity+json' );
-
-		return $response;
+		return $rest_response;
 	}

 	/**
@ -89,17 +89,34 @@ class Server {
 			return $response;
 		}

+		/**
+		 * Filter to defer signature verification
+		 *
+		 * Skip signature verification for debugging purposes or to reduce load for
+		 * certain Activity-Types, like "Delete".
+		 *
+		 * @param bool            $defer   Whether to defer signature verification.
+		 * @param WP_REST_Request $request The request used to generate the response.
+		 *
+		 * @return bool Whether to defer signature verification.
+		 */
+		$defer = \apply_filters( 'activitypub_defer_signature_verification', false, $request );
+
+		if ( $defer ) {
+			return $response;
+		}
+
 		// POST-Requets are always signed
-		if ( 'get' !== \strtolower( $request->get_method() ) ) {
+		if ( 'GET' !== $request->get_method() ) {
 			$verified_request = Signature::verify_http_signature( $request );
 			if ( \is_wp_error( $verified_request ) ) {
-				return $verified_request;
+				return new WP_Error( 'activitypub_signature_verification', $verified_request->get_error_message(), array( 'status' => 401 ) );
 			}
-		} elseif ( 'get' === \strtolower( $request->get_method() ) ) { // GET-Requests are only signed in secure mode
+		} elseif ( 'GET' === $request->get_method() ) { // GET-Requests are only signed in secure mode
 			if ( ACTIVITYPUB_AUTHORIZED_FETCH ) {
 				$verified_request = Signature::verify_http_signature( $request );
 				if ( \is_wp_error( $verified_request ) ) {
-					return $verified_request;
+					return new WP_Error( 'activitypub_signature_verification', $verified_request->get_error_message(), array( 'status' => 401 ) );
 				}
 			}
 		}
--- a/includes/rest/class-users.php
+++ b/includes/rest/class-users.php
@ -95,10 +95,10 @@ class Users {

 		$json = $user->to_array();

-		$response = new WP_REST_Response( $json, 200 );
-		$response->header( 'Content-Type', 'application/activity+json' );
+		$rest_response = new WP_REST_Response( $json, 200 );
+		$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );

-		return $response;
+		return $rest_response;
 	}


--- a/includes/table/class-followers.php
+++ b/includes/table/class-followers.php
@ -30,19 +30,24 @@ class Followers extends WP_List_Table {

 	public function get_columns() {
 		return array(
-			'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' ),
+			'cb'         => '<input type="checkbox" />',
+			'avatar'     => \__( 'Avatar', 'activitypub' ),
+			'post_title' => \__( 'Name', 'activitypub' ),
+			'username'   => \__( 'Username', 'activitypub' ),
+			'url'        => \__( 'URL', 'activitypub' ),
+			'published'  => \__( 'Followed', 'activitypub' ),
+			'modified'   => \__( 'Last updated', 'activitypub' ),
 		);
 	}

 	public function get_sortable_columns() {
-		return array();
+		$sortable_columns = array(
+			'post_title' => array( 'post_title', true ),
+			'modified'   => array( 'modified', false ),
+			'published'  => array( 'published', false ),
+		);
+
+		return $sortable_columns;
 	}

 	public function prepare_items() {
@ -55,8 +60,32 @@ class Followers extends WP_List_Table {
 		$page_num = $this->get_pagenum();
 		$per_page = 20;

-		$followers = FollowerCollection::get_followers( $this->user_id, $per_page, $page_num );
-		$counter   = FollowerCollection::count_followers( $this->user_id );
+		$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'];

 		$this->items = array();
 		$this->set_pagination_args(
@ -69,14 +98,13 @@ class Followers extends WP_List_Table {

 		foreach ( $followers as $follower ) {
 			$item = array(
-				'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(),
+				'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() ),
 			);

 			$this->items[] = $item;
@ -116,11 +144,11 @@ class Followers extends WP_List_Table {
 	}

 	public function process_action() {
-		if ( ! isset( $_REQUEST['followers'] ) || ! isset( $_REQUEST['_apnonce'] ) ) {
+		if ( ! isset( $_REQUEST['followers'] ) || ! isset( $_REQUEST['_wpnonce'] ) ) {
 			return false;
 		}
-		$nonce = sanitize_text_field( wp_unslash( $_REQUEST['_apnonce'] ) );
-		if ( ! wp_verify_nonce( $nonce, 'activitypub-followers-list' ) ) {
+		$nonce = sanitize_text_field( wp_unslash( $_REQUEST['_wpnonce'] ) );
+		if ( ! wp_verify_nonce( $nonce, 'bulk-' . $this->_args['plural'] ) ) {
 			return false;
 		}

--- a/includes/transformer/class-base.php
+++ b/includes/transformer/class-base.php
@ -0,0 +1,619 @@
+<?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;
+	}
+}
--- a/includes/transformer/class-post.php
+++ b/includes/transformer/class-post.php
@ -6,6 +6,7 @@ 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;
@ -14,312 +15,29 @@ 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 {
-
+class Post extends Base {
 	/**
-	 * The WP_Post object.
+	 * Getter function for the name of the transformer.
 	 *
-	 * @var WP_Post
+	 * @return string name
 	 */
-	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 );
+	public function get_name() {
+		return 'activitypub/default';
 	}

 	/**
+	 * Getter function for the display name (label/title) of the transformer.
 	 *
-	 *
-	 * @param WP_Post $wp_post
+	 * @return string name
 	 */
-	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(
-				\strstr( \get_locale(), '_', true ) => $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();
-	}
-
-	/**
-	 * Returns the Image Attachments for this Post, parsed from blocks.
-	 * @param int $max_images The maximum number of images to return.
-	 * @param array $image_ids The image IDs to append new IDs to.
-	 *
-	 * @return array The image IDs.
-	 */
-	protected function get_block_image_ids( $max_images, $image_ids = [] ) {
-		$blocks = \parse_blocks( $this->wp_post->post_content );
-		return self::get_image_ids_from_blocks( $blocks, $image_ids, $max_images );
-	}
-
-	/**
-	 * Recursively get image IDs from blocks.
-	 * @param array $blocks The blocks to search for image IDs
-	 * @param array $image_ids The image IDs to append new IDs to
-	 * @param int $max_images The maximum number of images to return.
-	 *
-	 * @return array The image IDs.
-	 */
-	protected static function get_image_ids_from_blocks( $blocks, $image_ids, $max_images ) {
-		foreach ( $blocks as $block ) {
-			// recurse into inner blocks
-			if ( ! empty( $block['innerBlocks'] ) ) {
-				$image_ids = self::get_image_ids_from_blocks( $block['innerBlocks'], $image_ids, $max_images );
-			}
-
-			switch ( $block['blockName'] ) {
-				case 'core/image':
-				case 'core/cover':
-					if ( ! empty( $block['attrs']['id'] ) ) {
-						$image_ids[] = $block['attrs']['id'];
-					}
-					break;
-				case 'jetpack/slideshow':
-				case 'jetpack/tiled-gallery':
-					if ( ! empty( $block['attrs']['ids'] ) ) {
-						$image_ids = array_merge( $image_ids, $block['attrs']['ids'] );
-					}
-					break;
-				case 'jetpack/image-compare':
-					if ( ! empty( $block['attrs']['beforeImageId'] ) ) {
-						$image_ids[] = $block['attrs']['beforeImageId'];
-					}
-					if ( ! empty( $block['attrs']['afterImageId'] ) ) {
-						$image_ids[] = $block['attrs']['afterImageId'];
-					}
-					break;
-			}
-
-			// we could be at or over max, stop unneeded work
-			if ( count( $image_ids ) >= $max_images ) {
-				break;
-			}
-		}
-
-		// still need to slice it because one gallery could knock us over the limit
-		return \array_slice( $image_ids, 0, $max_images );
-	}
-
-	/**
-	 * Generates all Image Attachments for a Post.
-	 *
-	 * @return array The Image Attachments.
-	 */
-	protected function get_attachments() {
-		$max_images = intval( \apply_filters( 'activitypub_max_image_attachments', \get_option( 'activitypub_max_image_attachments', ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS ) ) );
-
-		$images = array();
-
-		// max images can't be negative or zero
-		if ( $max_images <= 0 ) {
-			return $images;
-		}
-
-		$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 ) {
-			// first try to get images that are actually in the post content
-			if ( site_supports_blocks() && \has_blocks( $this->wp_post->post_content ) ) {
-				$block_image_ids = $this->get_block_image_ids( $max_images, $image_ids );
-				$image_ids = \array_merge( $image_ids, $block_image_ids );
-			} else {
-				// fallback to images attached to the post
-				$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 );
-
-		// get URLs for each image
-		foreach ( $image_ids as $id ) {
-			$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',
-				$this->get_image( $id, $image_size ),
-				$id,
-				$image_size
-			);
-
-			if ( $thumbnail ) {
-				$mimetype = \get_post_mime_type( $id );
-				$alt      = \get_post_meta( $id, '_wp_attachment_image_alt', true );
-				$image    = array(
-					'type'      => 'Image',
-					'url'       => $thumbnail[0],
-					'mediaType' => $mimetype,
-				);
-
-				if ( $alt ) {
-					$image['name'] = $alt;
-				}
-				$images[] = $image;
-			}
-		}
-
-		return $images;
-	}
-
-	/**
-	 * 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 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 );
-
-		$thumbnail = \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 $thumbnail;
+	public function get_label() {
+		return 'Built-In';
 	}

 	/**
@ -335,7 +53,9 @@ class Post {
 			return \ucfirst( \get_option( 'activitypub_object_type', 'note' ) );
 		}

-		$post_type = \get_post_type( $this->wp_post );
+		// Default to Article.
+		$object_type = 'Article';
+		$post_type   = \get_post_type( $this->wp_post );
 		switch ( $post_type ) {
 			case 'post':
 				$post_format = \get_post_format( $this->wp_post );
@ -365,7 +85,7 @@ class Post {
 				$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':
@ -386,133 +106,4 @@ class Post {

 		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 );
-	}
 }
--- a/includes/transformer/class-transformers-manager.php
+++ b/includes/transformer/class-transformers-manager.php
@ -0,0 +1,292 @@
+<?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 ) );
+		}
+	}
+}
--- a/integration/class-nodeinfo.php
+++ b/integration/class-nodeinfo.php
@ -1,6 +1,9 @@
 <?php
 namespace Activitypub\Integration;

+use function Activitypub\get_total_users;
+use function Activitypub\get_active_users;
+
 /**
 * Compatibility with the NodeInfo plugin
 *
@ -31,6 +34,12 @@ class Nodeinfo {
 			$nodeinfo['protocols']['outbound'][] = 'activitypub';
 		}

+		$nodeinfo['usage']['users'] = array(
+			'total'          => get_total_users(),
+			'activeMonth'    => get_active_users( '1 month ago' ),
+			'activeHalfyear' => get_active_users( '6 month ago' ),
+		);
+
 		return $nodeinfo;
 	}

@ -44,6 +53,12 @@ class Nodeinfo {
 	public static function add_nodeinfo2_discovery( $nodeinfo ) {
 		$nodeinfo['protocols'][] = 'activitypub';

+		$nodeinfo['usage']['users'] = array(
+			'total'          => get_total_users(),
+			'activeMonth'    => get_active_users( '1 month ago' ),
+			'activeHalfyear' => get_active_users( '6 month ago' ),
+		);
+
 		return $nodeinfo;
 	}
 }
--- a/integration/class-webfinger.php
+++ b/integration/class-webfinger.php
@ -30,6 +30,10 @@ 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',
--- a/readme.txt
+++ b/readme.txt
@ -2,8 +2,8 @@
 Contributors: automattic, pfefferle, mediaformat, mattwiebe, akirk, jeherve, nuriapena, cavalierlife
 Tags: OStatus, fediverse, activitypub, activitystream
 Requires at least: 4.7
-Tested up to: 6.3
-Stable tag: 1.0.7
+Tested up to: 6.4
+Stable tag: 1.2.0
 Requires PHP: 5.6
 License: MIT
 License URI: http://opensource.org/licenses/MIT
@ -105,6 +105,45 @@ 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!
+* Improved: better error messages if remote profile is not accessible
+* Improved: PHP 8.1 compatibility
+* Fixed: don't try to parse mentions or hashtags for very large (>1MB) posts to prevent timeouts
+* Fixed: better handling of ISO-639-1 locale codes
+* Improved: more reliable [ap_author], props @uk3
+* Improved: NodeInfo statistics
+
+= 1.0.10 =
+
+* Improved: better error messages if remote profile is not accessible
+
+= 1.0.9 =
+
+* Fixed: broken following endpoint
+
+= 1.0.8 =
+
+* Fixed: blocking of HEAD requests
+* Fixed: PHP fatal error
+* Fixed: several typos
+* Fixed: error codes
+* Improved: loading of shortcodes
+* Updated: caching of followers
+* Updated: Application-User is no longer "indexable"
+* Updated: more consistent usage of the `application/activity+json` Content-Type
+* Removed: featured tags endpoint
+
 = 1.0.7 =

 * Fixed: broken function call
--- a/src/follow-me/style.scss
+++ b/src/follow-me/style.scss
@ -73,6 +73,7 @@
 	.apfmd__button-group {
 		display: flex;
 		justify-content: flex-end;
+		align-items: flex-end;

 		svg {
 			margin-right: .5em;
@ -82,10 +83,11 @@

 		input {
 			flex: 1;
-			padding: {
-				left: 1em;
-				right: 1em;
-			}
+			padding: 6px 12px;
+			background-color: var( --wp--preset--color--white );
+			color: var( --wp--preset--color--black );
+			border: 1px solid var( --wp--preset--color--black );
 		}
+
 	}
 }
--- a/templates/blog-user-followers-list.php
+++ b/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>
--- a/templates/post-json.php
+++ b/templates/post-json.php
@ -2,8 +2,9 @@
 // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
 $post = \get_post();

-$object = new \Activitypub\Transformer\Post( $post );
-$json = \array_merge( array( '@context' => \Activitypub\get_context() ), $object->to_object()->to_array() );
+$transformer = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( $post );
+
+$json = \array_merge( array( '@context' => \Activitypub\get_context() ), $transformer->to_object()->to_array() );

 // filter output
 $json = \apply_filters( 'activitypub_json_post_array', $json );
--- a/templates/settings.php
+++ b/templates/settings.php
@ -138,7 +138,7 @@
 					</tr>
 					<tr>
 						<th scope="row">
-							<?php \esc_html_e( 'Number of images', 'activitypub' ); ?>
+							<?php \esc_html_e( 'Media attachments', 'activitypub' ); ?>
 						</th>
 						<td>
 							<input value="<?php echo esc_attr( \get_option( 'activitypub_max_image_attachments', ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS ) ); ?>" name="activitypub_max_image_attachments" id="activitypub_max_image_attachments" type="number" min="0" />
@ -147,13 +147,20 @@
 								echo \wp_kses(
 									\sprintf(
 										// translators:
-										\__( 'The number of images to attach to posts. Default: <code>%s</code>', 'activitypub' ),
+										\__( 'The number of media (images, audio, video) to attach to posts. Default: <code>%s</code>', 'activitypub' ),
 										\esc_html( ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS )
 									),
 									'default'
 								);
 								?>
 							</p>
+							<p class="description">
+								<em>
+									<?php
+										esc_html_e( 'Note: audio and video attachments are only supported from Block Editor.', 'activitypub' );
+									?>
+								</em>
+							</p>
 						</td>
 					</tr>
 					<tr>
@ -194,26 +201,6 @@
 							</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' ); ?>
@ -230,6 +217,93 @@
 			<?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">
--- a/templates/user-followers-list.php
+++ b/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>
--- a/tests/test-class-activitypub-activity.php
+++ b/tests/test-class-activitypub-activity.php
@ -17,7 +17,8 @@ class Test_Activitypub_Activity extends WP_UnitTestCase {
 			10
 		);

-		$activitypub_post = \Activitypub\Transformer\Post::transform( get_post( $post ) )->to_object();
+		$wp_post = get_post( $post );
+		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( $post )->to_object();

 		$activitypub_activity = new \Activitypub\Activity\Activity();
 		$activitypub_activity->set_type( 'Create' );
--- a/tests/test-class-activitypub-post.php
+++ b/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\Post::transform( get_post( $post ) )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( get_post( $post ) )->to_object();

 		$this->assertEquals( $permalink, $activitypub_post->get_id() );

 		\wp_trash_post( $post );

-		$activitypub_post = \Activitypub\Transformer\Post::transform( get_post( $post ) )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( get_post( $post ) )->to_object();

 		$this->assertEquals( $permalink, $activitypub_post->get_id() );

--- a/tests/test-class-activitypub-rest-post-signature-verification.php
+++ b/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\Post::transform( get_post( $post ) )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( 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\Post::transform( \get_post( $post ) )->to_object();
+		$activitypub_post = \Activitypub\Transformer\Transformers_Manager::instance()->get_transformer( get_post( $post )  )->to_object();
 		$activitypub_activity = new Activitypub\Activity\Activity();
 		$activitypub_activity->set_type( 'Create' );
 		$activitypub_activity->set_object( $activitypub_post );
Author	SHA1	Message	Date
André Menrath	c7ff99e77f	fix phpcs via phpcbf Some checks failed PHP_CodeSniffer / phpcs (push) Has been cancelled Details Unit Testing / phpunit (5.6, 6.2) (push) Has been cancelled Details Unit Testing / phpunit (7.0) (push) Has been cancelled Details Unit Testing / phpunit (7.2) (push) Has been cancelled Details Unit Testing / phpunit (7.3) (push) Has been cancelled Details Unit Testing / phpunit (7.4) (push) Has been cancelled Details Unit Testing / phpunit (8.0) (push) Has been cancelled Details Unit Testing / phpunit (8.1) (push) Has been cancelled Details Unit Testing / phpunit (8.2) (push) Has been cancelled Details Unit Testing / phpunit (latest) (push) Has been cancelled Details	2023-11-25 10:43:08 +01:00
André Menrath	e5d19f2b6a	fix phpdocs and some readability	2023-11-25 10:38:22 +01:00
André Menrath	768d190be0	move transofmrer function get_post_content_template to base class fix: make in_array comparison strict	2023-11-25 10:37:54 +01:00
André Menrath	9c20c8fced	fix init of new transformer instance	2023-11-25 10:37:00 +01:00
André Menrath	82928fb74d	fix phpdocs	2023-11-25 10:32:44 +01:00
André Menrath	d25a5c2d09	fix: forgotten merge conflict	2023-11-25 10:31:40 +01:00
André Menrath	47b7d8410f	cleanup: remove function get_post_content_template that is now present in parent base transformer class	2023-11-25 10:27:59 +01:00
André Menrath	8338ea4570	fix: make in_array comparison strict	2023-11-25 10:27:11 +01:00
André Menrath	81f971b477	fix creation of new transformer instance	2023-11-25 10:26:36 +01:00
André Menrath	2a7929719b	Merge branch 'add/extendable-transformers' of ssh://code.event-federation.eu:2222/Event-Federation/wordpress-activitypub into add/extendable-transformers	2023-11-25 10:24:45 +01:00
Matthias Pfefferle	75f1da13e8	Merge branch 'master' into add/extendable-transformers	2023-11-24 09:48:03 +01:00
Matthias Pfefferle	8849e7b446	Check if the current post type supports ActivityPub. (#570 ) * Check if the current post type supports ActivityPub. * Update includes/functions.php Co-authored-by: Jeremy Herve <jeremy@jeremy.hu> * Update functions.php --------- Co-authored-by: Jeremy Herve <jeremy@jeremy.hu>	2023-11-23 18:00:40 +01:00
André Menrath	ed1b6b7e77	change hook name for registering transformers follow WordPress coding style and coding style of this plugin	2023-11-22 14:58:06 +01:00
André Menrath	804cb0af1a	fix phpcs errors	2023-11-22 14:24:25 +01:00
André Menrath	0bd6eccfed	typo	2023-11-22 13:59:45 +01:00
André Menrath	c857eee616	transformer: move all related code to \Activitypub\Transformer namespace	2023-11-22 13:59:39 +01:00
André Menrath	369b32bc93	transformer: move all related code to \Activitypub\Transformer namespace	2023-11-22 08:36:55 +01:00
Matthias Pfefferle	3a5b530111	Merge branch 'master' into add/extendable-transformers	2023-11-21 15:25:07 +01:00
Matthias Pfefferle	ba44ac701b	remove var_dump	2023-11-21 15:05:47 +01:00
Matthias Pfefferle	1af821621b	check if ID is set fallback to URL	2023-11-21 15:05:12 +01:00
Matthias Pfefferle	d00e5a03c8	check if $resource is set	2023-11-21 15:00:39 +01:00
Matthias Pfefferle	60148a3b65	check if user is available	2023-11-21 14:57:44 +01:00
André Menrath	0501fc5ec7	Merge remote-tracking branch 'origin/master' into add/extendable-transformers also does `c35ddf1935`	2023-11-21 13:50:57 +01:00
André Menrath	2113d3e9b1	update phpdocs	2023-11-20 23:35:52 +01:00
André Menrath	246600b84e	add: untestet draft of the migration for the activated post type setting	2023-11-20 23:30:33 +01:00
André Menrath	0ccb6c91eb	fix: add missing self prefix of class constant	2023-11-20 19:39:13 +01:00
André Menrath	6d40ebf30e	Automatically set the wp_post when returning a transformer instance for the wp_post	2023-11-20 19:36:45 +01:00
André Menrath	3ae71bb18c	fix the wrongs calld of the get_transformer	2023-11-20 18:27:29 +01:00
André Menrath	38be5865c2	initial draft: add/extendable-transformers	2023-11-20 18:15:54 +01:00
Matthias Pfefferle	d226564325	prepare v1.2.0	2023-11-18 12:01:29 +01:00
Matt Wiebe	c35ddf1935	Attachments: dedupe earlier to prevent incorrect max_media (#565 )	2023-11-17 18:44:59 +01:00
Matthias Pfefferle	21206ecda0	search for followers and order the output list (#502 ) * search for followers and order the output list * re-use existing nonce! * verify nonce for search! --------- Co-authored-by: Matt Wiebe <wiebe@automattic.com>	2023-11-17 18:44:13 +01:00
Jan Boddez	efd98acd0b	Fix #493 (#497 ) * Fix #493 * Fix parenthesis * Allow `p` and `br` tags only for AP comments --------- Co-authored-by: Matthias Pfefferle <pfefferle@users.noreply.github.com>	2023-11-13 10:19:35 +01:00
Matthias Pfefferle	6810884c52	have a filter to defer signature verification (#435 )	2023-11-11 06:00:20 +01:00
Matt Wiebe	24d12de8ec	Follow Me: improve styles for dark themes (#557 )	2023-11-10 12:56:53 -06:00
Matthias Pfefferle	1437b5acd8	prepare compatibility with WP 6.4	2023-11-07 11:19:42 +01:00
Matthias Pfefferle	d8a2d75768	update changelog	2023-11-07 11:02:41 +01:00
Matthias Pfefferle	26d0d357c2	Add monthly active users (#530 ) * Add monthly active users for better stats on FediDB * use more optimized query thanks @mattwiebe * use transients, improve logic --------- Co-authored-by: Matt Wiebe <wiebe@automattic.com>	2023-11-07 10:27:20 +01:00
Matthias Pfefferle	57b39a5c08	prepare 1.1.0	2023-11-07 10:01:03 +01:00
Matthias Pfefferle	a81e20a9ba	fix issue when locale is only two chars (#549 ) for example "de" instead of "de_DE"	2023-11-07 08:49:48 +01:00
Ulrich Kiermayr	9d5bd8c220	More reliable way to get author and autorurl (#546 ) --------- Co-authored-by: Matt Wiebe <wiebe@automattic.com>	2023-11-06 17:10:54 -06:00
Matt Wiebe	74a774e8e7	Hashtags: 1MB limit for attempting to link (#544 )	2023-11-01 10:53:27 -05:00
Matt Wiebe	eda6d6d785	Mentions: 1MB limit for attempting to link mentions, otherwise bail (#540 )	2023-10-30 14:32:04 -05:00
Matt Wiebe	70cefc9712	prep readme for `1.1.0` release	2023-10-27 16:18:42 -05:00
Matt Wiebe	9ff4d1251a	Attachments: add support for audio 🔈 and video 📼 (#536 ) * only in the block editor * update settings page copy: media, not just images --------- Co-authored-by: Matthias Pfefferle <pfefferle@users.noreply.github.com>	2023-10-27 15:55:44 -05:00
Matt Wiebe	53adfe6b80	PHP 8.1 compatibility (#533 ) * PHP 8.1 compatibility * Update compat.php --------- Co-authored-by: Matthias Pfefferle <pfefferle@users.noreply.github.com>	2023-10-25 08:44:04 +02:00
Matthias Pfefferle	8078512b8c	small improvements	2023-10-24 14:54:03 +02:00
Matthias Pfefferle	d7810114b7	improve error messages and codes (#532 ) * improve error messages and codes * version bump	2023-10-24 13:00:22 +02:00
Matthias Pfefferle	e91334e4d7	fix following endpoint (#531 ) * fix following endpoint * version bump	2023-10-24 12:45:46 +02:00
Matthias Pfefferle	2664ae807c	update readme	2023-10-23 16:18:28 +02:00
Matthias Pfefferle	4d7c0594cd	remove featured tags endpoint	2023-10-23 16:16:26 +02:00
Matthias Pfefferle	b946ef3de1	more consistent use of response content type (#529 ) * more consistent use of response content type * update readme * fix typo	2023-10-23 14:57:58 +02:00
Matthias Pfefferle	9ac5d84f5c	updated readme	2023-10-23 14:56:37 +02:00
Matthias Pfefferle	b55c5d1666	use 401 instead of 403	2023-10-23 14:54:40 +02:00
Matthias Pfefferle	acc632f05c	prepare v1.0.8	2023-10-23 09:03:15 +02:00
Matthias Pfefferle	0ab8df539e	simplify check	2023-10-23 08:28:30 +02:00