Merge branch 'master' into signature_verification

README.md

@@ -2,7 +2,7 @@
 **Contributors:** [pfefferle](https://profiles.wordpress.org/pfefferle/), [mediaformat](https://profiles.wordpress.org/mediaformat/), [akirk](https://profiles.wordpress.org/akirk/), [automattic](https://profiles.wordpress.org/automattic/)  
 **Tags:** OStatus, fediverse, activitypub, activitystream  
 **Requires at least:** 4.7  
-**Tested up to:** 6.1  
+**Tested up to:** 6.2  
 **Stable tag:** 0.17.0  
 **Requires PHP:** 5.6  
 **License:** MIT  
@@ -111,7 +111,11 @@ Where 'blog' is the path to the subdirectory at which your blog resides.
 
 ## Changelog ##
 
-Project maintained on GitHub at [pfefferle/wordpress-activitypub](https://github.com/pfefferle/wordpress-activitypub).
+Project maintained on GitHub at [automattic/wordpress-activitypub](https://github.com/automattic/wordpress-activitypub).
+
+### Next ###
+
+* Compatibility: indicate that the plugin is compatible and has been tested with the latest version of WordPress, 6.2.
 
 ### 0.17.0 ###
 

activitypub.php

@@ -23,13 +23,16 @@ function init() {
 	\defined( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS' ) || \define( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS', 3 );
 	\defined( 'ACTIVITYPUB_HASHTAGS_REGEXP' ) || \define( 'ACTIVITYPUB_HASHTAGS_REGEXP', '(?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$))' );
 	\defined( 'ACTIVITYPUB_USERNAME_REGEXP' ) || \define( 'ACTIVITYPUB_USERNAME_REGEXP', '(?:([A-Za-z0-9_-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+))' );
-	\defined( 'ACTIVITYPUB_ALLOWED_HTML' ) || \define( 'ACTIVITYPUB_ALLOWED_HTML', '<strong><a><p><ul><ol><li><code><blockquote><pre><img>' );
 	\defined( 'ACTIVITYPUB_CUSTOM_POST_CONTENT' ) || \define( 'ACTIVITYPUB_CUSTOM_POST_CONTENT', "<p><strong>[ap_title]</strong></p>\n\n[ap_content]\n\n<p>[ap_hashtags]</p>\n\n<p>[ap_shortlink]</p>" );
+
 	\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__ ) );
 
-	require_once \dirname( __FILE__ ) . '/includes/table/followers-list.php';
+	\define( 'ACTIVITYPUB_OBJECT', 'ACTIVITYPUB_OBJECT' );
+
+	require_once \dirname( __FILE__ ) . '/includes/table/class-followers.php';
+	require_once \dirname( __FILE__ ) . '/includes/class-http.php';
 	require_once \dirname( __FILE__ ) . '/includes/class-signature.php';
 	require_once \dirname( __FILE__ ) . '/includes/class-webfinger.php';
 	require_once \dirname( __FILE__ ) . '/includes/peer/class-followers.php';
@@ -37,6 +40,10 @@ function init() {
 
 	require_once \dirname( __FILE__ ) . '/includes/model/class-activity.php';
 	require_once \dirname( __FILE__ ) . '/includes/model/class-post.php';
+	require_once \dirname( __FILE__ ) . '/includes/model/class-follower.php';
+
+	require_once \dirname( __FILE__ ) . '/includes/class-migration.php';
+	Migration::init();
 
 	require_once \dirname( __FILE__ ) . '/includes/class-activity-dispatcher.php';
 	Activity_Dispatcher::init();
@@ -44,6 +51,9 @@ function init() {
 	require_once \dirname( __FILE__ ) . '/includes/class-activitypub.php';
 	Activitypub::init();
 
+	require_once \dirname( __FILE__ ) . '/includes/collection/class-followers.php';
+	Collection\Followers::init();
+
 	// Configure the REST API route
 	require_once \dirname( __FILE__ ) . '/includes/rest/class-outbox.php';
 	Rest\Outbox::init();
@@ -142,3 +152,38 @@ function enable_buddypress_features() {
 	Integration\Buddypress::init();
 }
 add_action( 'bp_include', '\Activitypub\enable_buddypress_features' );
+
+/**
+ * `get_plugin_data` wrapper
+ *
+ * @return array The plugin metadata array
+ */
+function get_plugin_meta( $default_headers = array() ) {
+	if ( ! $default_headers ) {
+		$default_headers = array(
+			'Name'        => 'Plugin Name',
+			'PluginURI'   => 'Plugin URI',
+			'Version'     => 'Version',
+			'Description' => 'Description',
+			'Author'      => 'Author',
+			'AuthorURI'   => 'Author URI',
+			'TextDomain'  => 'Text Domain',
+			'DomainPath'  => 'Domain Path',
+			'Network'     => 'Network',
+			'RequiresWP'  => 'Requires at least',
+			'RequiresPHP' => 'Requires PHP',
+			'UpdateURI'   => 'Update URI',
+		);
+	}
+
+	return \get_file_data( __FILE__, $default_headers, 'plugin' );
+}
+
+/**
+ * Plugin Version Number used for caching.
+ */
+function get_plugin_version() {
+	$meta = get_plugin_meta( array( 'Version' => 'Version' ) );
+
+	return $meta['Version'];
+}

includes/class-activity-dispatcher.php

@@ -3,6 +3,7 @@ namespace Activitypub;
 
 use Activitypub\Model\Post;
 use Activitypub\Model\Activity;
+use Activitypub\Collection\Followers;
 
 /**
  * ActivityPub Activity_Dispatcher Class
@@ -60,17 +61,22 @@ class Activity_Dispatcher {
 	 * @return void
 	 */
 	public static function send_activity( Post $activitypub_post, $activity_type ) {
+		// check if a migration is needed before sending new posts
+		\Activitypub\Migration::maybe_migrate();
+
 		// get latest version of post
 		$user_id = $activitypub_post->get_post_author();
 
 		$activitypub_activity = new Activity( $activity_type );
 		$activitypub_activity->from_post( $activitypub_post );
 
-		$inboxes = \Activitypub\get_follower_inboxes( $user_id, $activitypub_activity->get_cc() );
+		$follower_inboxes = Followers::get_inboxes( $user_id );
+		$mentioned_inboxes = Mention::get_inboxes( $activitypub_activity->get_cc() );
 
-		foreach ( $inboxes as $inbox => $cc ) {
+		$inboxes = array_merge( $follower_inboxes, $mentioned_inboxes );
-			$cc = array_values( array_unique( $cc ) );
+		$inboxes = array_unique( $inboxes );
-			$activitypub_activity->add_cc( $cc );
+
+		foreach ( $inboxes as $inbox ) {
 			$activity = $activitypub_activity->to_json();
 
 			\Activitypub\safe_remote_post( $inbox, $activity, $user_id );

includes/class-activitypub.php

@@ -39,6 +39,9 @@ class Activitypub {
 			return $template;
 		}
 
+		// Ensure that edge caches know that this page can deliver both HTML and JSON.
+		header( 'Vary: Accept' );
+
 		// check if user can publish posts
 		if ( \is_author() && ! user_can( \get_the_author_meta( 'ID' ), 'publish_posts' ) ) {
 			return $template;

includes/class-admin.php

@@ -1,6 +1,8 @@
 <?php
 namespace Activitypub;
 
+use Activitypub\Model\Post;
+
 /**
  * ActivityPub Admin Class
  *
@@ -13,7 +15,9 @@ class Admin {
 	public static function init() {
 		\add_action( 'admin_menu', array( self::class, 'admin_menu' ) );
 		\add_action( 'admin_init', array( self::class, 'register_settings' ) );
-		\add_action( 'show_user_profile', array( self::class, 'add_fediverse_profile' ) );
+		\add_action( 'admin_init', array( self::class, 'schedule_migration' ) );
+		\add_action( 'show_user_profile', array( self::class, 'add_profile' ) );
+		\add_action( 'personal_options_update', array( self::class, 'save_user_description' ) );
 		\add_action( 'admin_enqueue_scripts', array( self::class, 'enqueue_scripts' ) );
 	}
 
@@ -31,7 +35,7 @@ class Admin {
 
 		\add_action( 'load-' . $settings_page, array( self::class, 'add_settings_help_tab' ) );
 
-		$followers_list_page = \add_users_page( \__( 'Followers', 'activitypub' ), \__( 'Followers (Fediverse)', 'activitypub' ), 'read', 'activitypub-followers-list', array( self::class, 'followers_list_page' ) );
+		$followers_list_page = \add_users_page( \__( 'Followers', 'activitypub' ), \__( 'Followers', 'activitypub' ), 'read', 'activitypub-followers-list', array( self::class, 'followers_list_page' ) );
 
 		\add_action( 'load-' . $followers_list_page, array( self::class, 'add_followers_list_help_tab' ) );
 	}
@@ -50,9 +54,7 @@ class Admin {
 
 		switch ( $tab ) {
 			case 'settings':
-				\Activitypub\Model\Post::upgrade_post_content_template();
+				\load_template( ACTIVITYPUB_PLUGIN_DIR . 'templates/settings.php' );
-
-				\load_template( \dirname( __FILE__ ) . '/../templates/settings.php' );
 				break;
 			case 'welcome':
 			default:
@@ -60,7 +62,7 @@ class Admin {
 				add_thickbox();
 				wp_enqueue_script( 'updates' );
 
-				\load_template( \dirname( __FILE__ ) . '/../templates/welcome.php' );
+				\load_template( ACTIVITYPUB_PLUGIN_DIR . 'templates/welcome.php' );
 				break;
 		}
 	}
@@ -69,7 +71,7 @@ class Admin {
 	 * Load user settings page
 	 */
 	public static function followers_list_page() {
-		\load_template( \dirname( __FILE__ ) . '/../templates/followers-list.php' );
+		\load_template( ACTIVITYPUB_PLUGIN_DIR . 'templates/followers-list.php' );
 	}
 
 	/**
@@ -153,19 +155,40 @@ class Admin {
 		);
 	}
 
+	public static function schedule_migration() {
+		if ( ! \wp_next_scheduled( 'activitypub_schedule_migration' ) ) {
+			\wp_schedule_single_event( \time(), 'activitypub_schedule_migration' );
+		}
+	}
+
 	public static function add_settings_help_tab() {
-		require_once \dirname( __FILE__ ) . '/help.php';
+		require_once ACTIVITYPUB_PLUGIN_DIR . 'includes/help.php';
 	}
 
 	public static function add_followers_list_help_tab() {
 		// todo
 	}
 
-	public static function add_fediverse_profile( $user ) {
+	public static function add_profile( $user ) {
-		?>
+		$description = get_user_meta( $user->ID, 'activitypub_user_description', true );
-		<h2 id="activitypub"><?php \esc_html_e( 'ActivityPub', 'activitypub' ); ?></h2>
+
-		<?php
+		\load_template(
-		\Activitypub\get_identifier_settings( $user->ID );
+			ACTIVITYPUB_PLUGIN_DIR . 'templates/user-settings.php',
+			true,
+			array(
+				'description' => $description,
+			)
+		);
+	}
+
+	public static function save_user_description( $user_id ) {
+		if ( isset( $_REQUEST['_apnonce'] ) && ! wp_verify_nonce( $_REQUEST['_apnonce'], 'activitypub-user-description' ) ) {
+			return false;
+		}
+		if ( ! current_user_can( 'edit_user', $user_id ) ) {
+			return false;
+		}
+		update_user_meta( $user_id, 'activitypub_user_description', sanitize_text_field( $_POST['activitypub-user-description'] ) );
 	}
 
 	public static function enqueue_scripts( $hook_suffix ) {

includes/class-http.php

@@ -0,0 +1,93 @@
+<?php
+namespace Activitypub;
+
+use WP_Error;
+
+/**
+ * ActivityPub HTTP Class
+ *
+ * @author Matthias Pfefferle
+ */
+class Http {
+	/**
+	 * Send a POST Request with the needed HTTP Headers
+	 *
+	 * @param string $url     The URL endpoint
+	 * @param string $body    The Post Body
+	 * @param int    $user_id The WordPress User-ID
+	 *
+	 * @return array|WP_Error The POST Response or an WP_ERROR
+	 */
+	public static function post( $url, $body, $user_id ) {
+		$date = \gmdate( 'D, d M Y H:i:s T' );
+		$digest = Signature::generate_digest( $body );
+		$signature = Signature::generate_signature( $user_id, 'post', $url, $date, $digest );
+
+		$wp_version = \get_bloginfo( 'version' );
+		$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
+		$args = array(
+			'timeout' => 100,
+			'limit_response_size' => 1048576,
+			'redirection' => 3,
+			'user-agent' => "$user_agent; ActivityPub",
+			'headers' => array(
+				'Accept' => 'application/activity+json',
+				'Content-Type' => 'application/activity+json',
+				'Digest' => "SHA-256=$digest",
+				'Signature' => $signature,
+				'Date' => $date,
+			),
+			'body' => $body,
+		);
+
+		$response = \wp_safe_remote_post( $url, $args );
+		$code     = \wp_remote_retrieve_response_code( $response );
+
+		if ( 400 <= $code && 500 >= $code ) {
+			$response = new WP_Error( $code, __( 'Failed HTTP Request', 'activitypub' ) );
+		}
+
+		\do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id );
+
+		return $response;
+	}
+
+	/**
+	 * Send a GET Request with the needed HTTP Headers
+	 *
+	 * @param string $url     The URL endpoint
+	 * @param int    $user_id The WordPress User-ID
+	 *
+	 * @return array|WP_Error The GET Response or an WP_ERROR
+	 */
+	public static function get( $url, $user_id ) {
+		$date = \gmdate( 'D, d M Y H:i:s T' );
+		$signature = Signature::generate_signature( $user_id, 'get', $url, $date );
+
+		$wp_version = \get_bloginfo( 'version' );
+		$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
+		$args = array(
+			'timeout' => apply_filters( 'activitypub_remote_get_timeout', 100 ),
+			'limit_response_size' => 1048576,
+			'redirection' => 3,
+			'user-agent' => "$user_agent; ActivityPub",
+			'headers' => array(
+				'Accept' => 'application/activity+json',
+				'Content-Type' => 'application/activity+json',
+				'Signature' => $signature,
+				'Date' => $date,
+			),
+		);
+
+		$response = \wp_safe_remote_get( $url, $args );
+		$code     = \wp_remote_retrieve_response_code( $response );
+
+		if ( 400 <= $code && 500 >= $code ) {
+			$response = new WP_Error( $code, __( 'Failed HTTP Request', 'activitypub' ) );
+		}
+
+		\do_action( 'activitypub_safe_remote_get_response', $response, $url, $user_id );
+
+		return $response;
+	}
+}

includes/class-mention.php

@@ -1,6 +1,8 @@
 <?php
 namespace Activitypub;
 
+use WP_Error;
+
 /**
  * ActivityPub Mention Class
  *
@@ -46,6 +48,12 @@ class Mention {
 			$the_content
 		);
 
+		$the_content = preg_replace_callback(
+			'#<img.*?[^>]+>#i',
+			$protect,
+			$the_content
+		);
+
 		$the_content = \preg_replace_callback( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/', array( self::class, 'replace_with_links' ), $the_content );
 
 		$the_content = str_replace( array_reverse( array_keys( $protected_tags ) ), array_reverse( array_values( $protected_tags ) ), $the_content );
@@ -57,10 +65,11 @@ class Mention {
 	 * A callback for preg_replace to build the user links
 	 *
 	 * @param array $result the preg_match results
+	 *
 	 * @return string the final string
 	 */
 	public static function replace_with_links( $result ) {
-		$metadata = \ActivityPub\get_remote_metadata_by_actor( $result[0] );
+		$metadata = get_remote_metadata_by_actor( $result[0] );
 		if ( ! is_wp_error( $metadata ) && ! empty( $metadata['url'] ) ) {
 			$username = ltrim( $result[0], '@' );
 			if ( ! empty( $metadata['name'] ) ) {
@@ -76,17 +85,64 @@ class Mention {
 		return $result[0];
 	}
 
+	/**
+	 * Get the Inboxes for the mentioned Actors
+	 *
+	 * @param array $mentioned The list of Actors that were mentioned
+	 *
+	 * @return array The list of Inboxes
+	 */
+	public static function get_inboxes( $mentioned ) {
+		$inboxes = array();
+
+		foreach ( $mentioned as $actor ) {
+			$inbox = self::get_inbox_by_mentioned_actor( $actor );
+
+			if ( ! is_wp_error( $inbox ) && $inbox ) {
+				$inboxes[] = $inbox;
+			}
+		}
+
+		return $inboxes;
+	}
+
+	/**
+	 * Get the inbox from the Remote-Profile of a mentioned Actor
+	 *
+	 * @param string $actor The Actor-URL
+	 *
+	 * @return string The Inbox-URL
+	 */
+	public static function get_inbox_by_mentioned_actor( $actor ) {
+		$metadata = get_remote_metadata_by_actor( $actor, true );
+
+		if ( \is_wp_error( $metadata ) ) {
+			return $metadata;
+		}
+
+		if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
+			return $metadata['endpoints']['sharedInbox'];
+		}
+
+		if ( \array_key_exists( 'inbox', $metadata ) ) {
+			return $metadata['inbox'];
+		}
+
+		return new WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata );
+	}
+
 	/**
 	 * Extract the mentions from the post_content.
 	 *
 	 * @param array  $mentions The already found mentions.
 	 * @param string $post_content The post content.
+	 *
 	 * @return mixed The discovered mentions.
 	 */
 	public static function extract_mentions( $mentions, $post_content ) {
 		\preg_match_all( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/i', $post_content, $matches );
 		foreach ( $matches[0] as $match ) {
-			$link = \Activitypub\Webfinger::resolve( $match );
+			$link = Webfinger::resolve( $match );
 			if ( ! is_wp_error( $link ) ) {
 				$mentions[ $match ] = $link;
 			}

includes/class-migration.php

@@ -0,0 +1,119 @@
+<?php
+namespace Activitypub;
+
+use Acctivitypub\Model\Follower;
+
+class Migration {
+	public static function init() {
+		\add_action( 'activitypub_schedule_migration', array( self::class, 'maybe_migrate' ) );
+	}
+
+	public static function get_target_version() {
+		return get_plugin_version();
+	}
+
+	public static function get_version() {
+		return get_option( 'activitypub_db_version', 0 );
+	}
+
+	/**
+	 * Whether the database structure is up to date.
+	 *
+	 * @return bool
+	 */
+	public static function is_latest_version() {
+		return (bool) version_compare(
+			self::get_version(),
+			self::get_target_version(),
+			'=='
+		);
+	}
+
+	/**
+	 * Updates the database structure if necessary.
+	 */
+	public static function maybe_migrate() {
+		if ( self::is_latest_version() ) {
+			return;
+		}
+
+		$version_from_db = self::get_version();
+
+		if ( version_compare( $version_from_db, '0.16.0', '<' ) ) {
+			self::migrate_from_0_16();
+		}
+		if ( version_compare( $version_from_db, '0.17.0', '<' ) ) {
+			self::migrate_from_0_17();
+		}
+
+		update_option( 'activitypub_db_version', self::get_target_version() );
+	}
+
+	/**
+	 * Updates the DB-schema of the followers-list
+	 *
+	 * @return void
+	 */
+	private static function migrate_from_0_17() {
+		foreach ( get_users( array( 'fields' => 'ID' ) ) as $user_id ) {
+			$followers = get_user_meta( $user_id, 'activitypub_followers', true );
+
+			if ( $followers ) {
+				foreach ( $followers as $follower ) {
+					$meta = get_remote_metadata_by_actor( $actor );
+
+					$follower = new Follower( $actor );
+
+					if ( is_tombstone( $meta ) ) {
+						continue;
+					} if ( empty( $meta ) || ! is_array( $meta ) || is_wp_error( $meta ) ) {
+						$follower->set_error( $meta );
+					} else {
+						$follower->from_meta( $meta );
+					}
+
+					$follower->upsert();
+
+					$result = wp_set_object_terms( $user_id, $follower->get_actor(), self::TAXONOMY, true );
+				}
+			}
+		}
+	}
+
+	/**
+	 * Updates the custom template to use shortcodes instead of the deprecated templates.
+	 *
+	 * @return void
+	 */
+	private static function migrate_from_0_16() {
+		// Get the custom template.
+		$old_content = \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
+
+		// If the old content exists but is a blank string, we're going to need a flag to updated it even
+		// after setting it to the default contents.
+		$need_update = false;
+
+		// If the old contents is blank, use the defaults.
+		if ( '' === $old_content ) {
+			$old_content = ACTIVITYPUB_CUSTOM_POST_CONTENT;
+			$need_update = true;
+		}
+
+		// Set the new content to be the old content.
+		$content = $old_content;
+
+		// Convert old templates to shortcodes.
+		$content = \str_replace( '%title%', '[ap_title]', $content );
+		$content = \str_replace( '%excerpt%', '[ap_excerpt]', $content );
+		$content = \str_replace( '%content%', '[ap_content]', $content );
+		$content = \str_replace( '%permalink%', '[ap_permalink type="html"]', $content );
+		$content = \str_replace( '%shortlink%', '[ap_shortlink type="html"]', $content );
+		$content = \str_replace( '%hashtags%', '[ap_hashtags]', $content );
+		$content = \str_replace( '%tags%', '[ap_hashtags]', $content );
+
+		// Store the new template if required.
+		if ( $content !== $old_content || $need_update ) {
+			\update_option( 'activitypub_custom_post_content', $content );
+		}
+	}
+}

includes/collection/class-followers.php

@@ -0,0 +1,407 @@
+<?php
+namespace Activitypub\Collection;
+
+use WP_Error;
+use Exception;
+use WP_Term_Query;
+use Activitypub\Http;
+use Activitypub\Webfinger;
+use Activitypub\Model\Activity;
+use Activitypub\Model\Follower;
+
+use function Activitypub\is_tombstone;
+use function Activitypub\get_remote_metadata_by_actor;
+
+/**
+ * ActivityPub Followers Collection
+ *
+ * @author Matthias Pfefferle
+ */
+class Followers {
+	const TAXONOMY = 'activitypub-followers';
+
+	/**
+	 * Register WordPress hooks/actions and register Taxonomy
+	 *
+	 * @return void
+	 */
+	public static function init() {
+		// register "followers" taxonomy
+		self::register_taxonomy();
+
+		\add_action( 'activitypub_inbox_follow', array( self::class, 'handle_follow_request' ), 10, 2 );
+		\add_action( 'activitypub_inbox_undo', array( self::class, 'handle_undo_request' ), 10, 2 );
+
+		\add_action( 'activitypub_followers_post_follow', array( self::class, 'send_follow_response' ), 10, 4 );
+	}
+
+	/**
+	 * Register the "Followers" Taxonomy
+	 *
+	 * @return void
+	 */
+	public static function register_taxonomy() {
+		$args = array(
+			'labels'            => array(
+				'name'          => _x( 'Followers', 'taxonomy general name', 'activitypub' ),
+				'singular_name' => _x( 'Followers', 'taxonomy singular name', 'activitypub' ),
+				'menu_name'     => __( 'Followers', 'activitypub' ),
+			),
+			'hierarchical'      => false,
+			'show_ui'           => false,
+			'show_in_menu'      => false,
+			'show_in_nav_menus' => false,
+			'show_admin_column' => false,
+			'query_var'         => false,
+			'rewrite'           => false,
+			'public'            => false,
+			'capabilities'      => array(
+				'edit_terms' => null,
+			),
+		);
+
+		register_taxonomy( self::TAXONOMY, 'user', $args );
+		register_taxonomy_for_object_type( self::TAXONOMY, 'user' );
+
+		register_term_meta(
+			self::TAXONOMY,
+			'name',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => function( $value ) {
+					return sanitize_user( $value );
+				},
+			)
+		);
+
+		register_term_meta(
+			self::TAXONOMY,
+			'username',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => function( $value ) {
+					return sanitize_user( $value, true );
+				},
+			)
+		);
+
+		register_term_meta(
+			self::TAXONOMY,
+			'avatar',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => function( $value ) {
+					if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
+						return '';
+					}
+
+					return esc_url_raw( $value );
+				},
+			)
+		);
+
+		register_term_meta(
+			self::TAXONOMY,
+			'inbox',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => function( $value ) {
+					if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
+						throw new Exception( '"inbox" has to be a valid URL' );
+					}
+
+					return esc_url_raw( $value );
+				},
+			)
+		);
+
+		register_term_meta(
+			self::TAXONOMY,
+			'shared_inbox',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => function( $value ) {
+					if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
+						return null;
+					}
+
+					return esc_url_raw( $value );
+				},
+			)
+		);
+
+		register_term_meta(
+			self::TAXONOMY,
+			'updated_at',
+			array(
+				'type'              => 'string',
+				'single'            => true,
+				'sanitize_callback' => function( $value ) {
+					if ( ! is_numeric( $value ) && (int) $value !== $value ) {
+						$value = strtotime( 'now' );
+					}
+
+					return $value;
+				},
+			)
+		);
+
+		register_term_meta(
+			self::TAXONOMY,
+			'errors',
+			array(
+				'type'              => 'string',
+				'single'            => false,
+				'sanitize_callback' => function( $value ) {
+					if ( ! is_string( $value ) ) {
+						throw new Exception( 'Error message is no valid string' );
+					}
+
+					return esc_sql( $value );
+				},
+			)
+		);
+
+		do_action( 'activitypub_after_register_taxonomy' );
+	}
+
+	/**
+	 * Handle the "Follow" Request
+	 *
+	 * @param array $object    The JSON "Follow" Activity
+	 * @param int   $user_id The ID of the ID of the WordPress User
+	 *
+	 * @return void
+	 */
+	public static function handle_follow_request( $object, $user_id ) {
+		// save follower
+		$follower = self::add_follower( $user_id, $object['actor'] );
+
+		do_action( 'activitypub_followers_post_follow', $object['actor'], $object, $user_id, $follower );
+	}
+
+	/**
+	 * Handles "Unfollow" requests
+	 *
+	 * @param array $object  The JSON "Undo" Activity
+	 * @param int   $user_id The ID of the ID of the WordPress User
+	 */
+	public static function handle_undo_request( $object, $user_id ) {
+		if (
+			isset( $object['object'] ) &&
+			isset( $object['object']['type'] ) &&
+			'Follow' === $object['object']['type']
+		) {
+			self::remove_follower( $user_id, $object['actor'] );
+		}
+	}
+
+	/**
+	 * Add a new Follower
+	 *
+	 * @param int    $user_id The ID of the WordPress User
+	 * @param string $actor   The Actor URL
+	 *
+	 * @return array|WP_Error The Follower (WP_Term array) or an WP_Error
+	 */
+	public static function add_follower( $user_id, $actor ) {
+		$meta = get_remote_metadata_by_actor( $actor );
+
+		if ( empty( $meta ) || ! is_array( $meta ) || is_wp_error( $meta ) ) {
+			return $meta;
+		}
+
+		$follower = new Follower( $actor );
+		$follower->from_meta( $meta );
+		$follower->upsert();
+
+		$result = wp_set_object_terms( $user_id, $follower->get_actor(), self::TAXONOMY, true );
+
+		if ( is_wp_error( $result ) ) {
+			return $result;
+		} else {
+			return $follower;
+		}
+	}
+
+	/**
+	 * Remove a Follower
+	 *
+	 * @param int    $user_id The ID of the WordPress User
+	 * @param string $actor   The Actor URL
+	 *
+	 * @return bool|WP_Error True on success, false or WP_Error on failure.
+	 */
+	public static function remove_follower( $user_id, $actor ) {
+		return wp_remove_object_terms( $user_id, $actor, self::TAXONOMY );
+	}
+
+	/**
+	 * Remove a Follower
+	 *
+	 * @param int   $user_id The ID of the WordPress User
+	 * @param string $actor  The Actor URL
+	 *
+	 * @return \Activitypub\Model\Follower The Follower object
+	 */
+	public static function get_follower( $user_id, $actor ) {
+		$terms = new WP_Term_Query(
+			array(
+				'name'       => $actor,
+				'taxonomy'   => self::TAXONOMY,
+				'hide_empty' => false,
+				'object_ids' => $user_id,
+				'number'     => 1,
+			)
+		);
+
+		$term = $terms->get_terms();
+
+		if ( is_array( $term ) && ! empty( $term ) ) {
+			$term = reset( $term );
+			return new Follower( $term->name );
+		}
+
+		return null;
+	}
+
+	/**
+	 * Send Accept response
+	 *
+	 * @param string                     $actor    The Actor URL
+	 * @param array                      $object   The Activity object
+	 * @param int                        $user_id  The ID of the WordPress User
+	 * @param Activitypub\Model\Follower $follower The Follower object
+	 *
+	 * @return void
+	 */
+	public static function send_follow_response( $actor, $object, $user_id, $follower ) {
+		if ( is_wp_error( $follower ) ) {
+			// it is not even possible to send a "Reject" because
+			// we can not get the Remote-Inbox
+			return;
+		}
+
+		if ( isset( $object['user_id'] ) ) {
+			unset( $object['user_id'] );
+			unset( $object['@context'] );
+		}
+
+		// get inbox
+		$inbox = $follower->get_inbox();
+
+		// send "Accept" activity
+		$activity = new Activity( 'Accept' );
+		$activity->set_object( $object );
+		$activity->set_actor( \get_author_posts_url( $user_id ) );
+		$activity->set_to( $actor );
+		$activity->set_id( \get_author_posts_url( $user_id ) . '#follow-' . \preg_replace( '~^https?://~', '', $actor ) );
+
+		$activity = $activity->to_simple_json();
+		$response = Http::post( $inbox, $activity, $user_id );
+	}
+
+	/**
+	 * Get the Followers of a given user
+	 *
+	 * @param int    $user_id The ID of the WordPress User
+	 * @param string $output  The output format, supported ARRAY_N, OBJECT and ACTIVITYPUB_OBJECT
+	 * @param int    $number  Limts the result
+	 * @param int    $offset  Offset
+	 *
+	 * @return array The Term list of Followers, the format depends on $output
+	 */
+	public static function get_followers( $user_id, $output = ARRAY_N, $number = null, $offset = null, $args = array() ) {
+		$defaults = array(
+			'taxonomy'   => self::TAXONOMY,
+			'hide_empty' => false,
+			'object_ids' => $user_id,
+			'number'     => $number,
+			'offset'     => $offset,
+			'orderby'    => 'id',
+			'order'      => 'ASC',
+		);
+
+		$args  = wp_parse_args( $args, $defaults );
+		$terms = new WP_Term_Query( $args );
+
+		$items = array();
+
+		// change output format
+		switch ( $output ) {
+			case ACTIVITYPUB_OBJECT:
+				foreach ( $terms->get_terms() as $follower ) {
+					$items[] = new Follower( $follower->name ); // phpcs:ignore
+				}
+				return $items;
+			case OBJECT:
+				return $terms->get_terms();
+			case ARRAY_N:
+			default:
+				foreach ( $terms->get_terms() as $follower ) {
+					$items[] = $follower->name; // phpcs:ignore
+				}
+				return $items;
+		}
+	}
+
+	/**
+	 * Count the total number of followers
+	 *
+	 * @param int $user_id The ID of the WordPress User
+	 *
+	 * @return int The number of Followers
+	 */
+	public static function count_followers( $user_id ) {
+		return count( self::get_followers( $user_id ) );
+	}
+
+	/**
+	 * Returns all Inboxes fo a Users Followers
+	 *
+	 * @param int $user_id The ID of the WordPress User
+	 *
+	 * @return array The list of Inboxes
+	 */
+	public static function get_inboxes( $user_id ) {
+		// get all Followers of a ID of the WordPress User
+		$terms = new WP_Term_Query(
+			array(
+				'taxonomy'   => self::TAXONOMY,
+				'hide_empty' => false,
+				'object_ids' => $user_id,
+				'fields'     => 'ids',
+				'meta_query' => array(
+					array(
+						'key'     => 'inbox',
+						'compare' => 'EXISTS',
+					),
+				),
+			)
+		);
+
+		$terms = $terms->get_terms();
+
+		if ( ! $terms ) {
+			return array();
+		}
+
+		global $wpdb;
+		$results = $wpdb->get_col(
+			$wpdb->prepare(
+				"SELECT DISTINCT meta_value FROM {$wpdb->termmeta}
+				WHERE term_id IN (" . implode( ', ', array_fill( 0, count( $terms ), '%d' ) ) . ")
+				AND meta_key = 'shared_inbox'
+				AND meta_value IS NOT NULL",
+				$terms
+			)
+		);
+
+		return array_filter( $results );
+	}
+}

includes/functions.php

@@ -33,58 +33,11 @@ function get_context() {
 }
 
 function safe_remote_post( $url, $body, $user_id ) {
-	$date = \gmdate( 'D, d M Y H:i:s T' );
+	return \Activitypub\Http::post( $url, $body, $user_id );
-	$digest = \Activitypub\Signature::generate_digest( $body );
-	$signature = \Activitypub\Signature::generate_signature( $user_id, 'post', $url, $date, $digest );
-
-	$wp_version = \get_bloginfo( 'version' );
-	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
-	$args = array(
-		'timeout' => 100,
-		'limit_response_size' => 1048576,
-		'redirection' => 3,
-		'user-agent' => "$user_agent; ActivityPub",
-		'headers' => array(
-			'Accept' => 'application/activity+json',
-			'Content-Type' => 'application/activity+json',
-			'Digest' => "SHA-256=$digest",
-			'Signature' => $signature,
-			'Date' => $date,
-		),
-		'body' => $body,
-	);
-
-	$response = \wp_safe_remote_post( $url, $args );
-
-	\do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id );
-
-	return $response;
 }
 
 function safe_remote_get( $url, $user_id ) {
-	$date = \gmdate( 'D, d M Y H:i:s T' );
+	return \Activitypub\Http::get( $url, $user_id );
-	$signature = \Activitypub\Signature::generate_signature( $user_id, 'get', $url, $date );
-
-	$wp_version = \get_bloginfo( 'version' );
-	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
-	$args = array(
-		'timeout' => apply_filters( 'activitypub_remote_get_timeout', 100 ),
-		'limit_response_size' => 1048576,
-		'redirection' => 3,
-		'user-agent' => "$user_agent; ActivityPub",
-		'headers' => array(
-			'Accept' => 'application/activity+json',
-			'Content-Type' => 'application/activity+json',
-			'Signature' => $signature,
-			'Date' => $date,
-		),
-	);
-
-	$response = \wp_safe_remote_get( $url, $args );
-
-	\do_action( 'activitypub_safe_remote_get_response', $response, $url, $user_id );
-
-	return $response;
 }
 
 /**
@@ -95,15 +48,15 @@ function safe_remote_get( $url, $user_id ) {
  * @return string The user-resource
  */
 function get_webfinger_resource( $user_id ) {
-	return \Activitypub\Webfinger::get_user_resource( $user_id );
+	return Webfinger::get_user_resource( $user_id );
 }
 
 /**
- * [get_metadata_by_actor description]
+ * Requests the Meta-Data from the Actors profile
  *
- * @param string $actor
+ * @param string $actor The Actor URL
  *
- * @return array
+ * @return array The Actor profile as array
  */
 function get_remote_metadata_by_actor( $actor ) {
 	$pre = apply_filters( 'pre_get_remote_metadata_by_actor', false, $actor );
@@ -149,7 +102,7 @@ function get_remote_metadata_by_actor( $actor ) {
 		return 3;
 	};
 	add_filter( 'activitypub_remote_get_timeout', $short_timeout );
-	$response = \Activitypub\safe_remote_get( $actor, $user_id );
+	$response = Http::get( $actor, $user_id );
 	remove_filter( 'activitypub_remote_get_timeout', $short_timeout );
 	if ( \is_wp_error( $response ) ) {
 		\set_transient( $transient_key, $response, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
@@ -159,88 +112,17 @@ function get_remote_metadata_by_actor( $actor ) {
 	$metadata = \wp_remote_retrieve_body( $response );
 	$metadata = \json_decode( $metadata, true );
 
+	\set_transient( $transient_key, $metadata, WEEK_IN_SECONDS );
+
 	if ( ! $metadata ) {
 		$metadata = new \WP_Error( 'activitypub_invalid_json', \__( 'No valid JSON data', 'activitypub' ), $actor );
 		\set_transient( $transient_key, $metadata, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
 		return $metadata;
 	}
 
-	\set_transient( $transient_key, $metadata, WEEK_IN_SECONDS );
-
 	return $metadata;
 }
 
-/**
- * [get_inbox_by_actor description]
- * @param  [type] $actor [description]
- * @return [type]        [description]
- */
-function get_inbox_by_actor( $actor ) {
-	$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
-
-	if ( \is_wp_error( $metadata ) ) {
-		return $metadata;
-	}
-
-	if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
-		return $metadata['endpoints']['sharedInbox'];
-	}
-
-	if ( \array_key_exists( 'inbox', $metadata ) ) {
-		return $metadata['inbox'];
-	}
-
-	return new \WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata );
-}
-
-/**
- * [get_inbox_by_actor description]
- * @param  [type] $actor [description]
- * @return [type]        [description]
- */
-function get_publickey_by_actor( $actor, $key_id ) {
-	$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
-
-	if ( \is_wp_error( $metadata ) ) {
-		return $metadata;
-	}
-
-	if (
-		isset( $metadata['publicKey'] ) &&
-		isset( $metadata['publicKey']['id'] ) &&
-		isset( $metadata['publicKey']['owner'] ) &&
-		isset( $metadata['publicKey']['publicKeyPem'] ) &&
-		$key_id === $metadata['publicKey']['id'] &&
-		$actor === $metadata['publicKey']['owner']
-	) {
-		return $metadata['publicKey']['publicKeyPem'];
-	}
-
-	return new \WP_Error( 'activitypub_no_public_key', \__( 'No "Public-Key" found', 'activitypub' ), $metadata );
-}
-
-function get_follower_inboxes( $user_id, $cc = array() ) {
-	$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
-	$followers = array_merge( $followers, $cc );
-	$followers = array_unique( $followers );
-
-	$inboxes = array();
-
-	foreach ( $followers as $follower ) {
-		$inbox = \Activitypub\get_inbox_by_actor( $follower );
-		if ( ! $inbox || \is_wp_error( $inbox ) ) {
-			continue;
-		}
-		// init array if empty
-		if ( ! isset( $inboxes[ $inbox ] ) ) {
-			$inboxes[ $inbox ] = array();
-		}
-		$inboxes[ $inbox ][] = $follower;
-	}
-
-	return $inboxes;
-}
-
 function get_identifier_settings( $user_id ) {
 	?>
 <table class="form-table">
@@ -261,19 +143,11 @@ function get_identifier_settings( $user_id ) {
 }
 
 function get_followers( $user_id ) {
-	$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
+	return Collection\Followers::get_followers( $user_id );
-
-	if ( ! $followers ) {
-		return array();
-	}
-
-	return $followers;
 }
 
 function count_followers( $user_id ) {
-	$followers = \Activitypub\get_followers( $user_id );
+	return Collection\Followers::count_followers( $user_id );
-
-	return \count( $followers );
 }
 
 /**
@@ -323,3 +197,38 @@ function url_to_authorid( $url ) {
 
 	return 0;
 }
+
+/**
+ * Return the custom Activity Pub description, if set, or default author description.
+ *
+ * @param int $user_id The user ID.
+ * @return string
+ */
+function get_author_description( $user_id ) {
+	$description = get_user_meta( $user_id, 'activitypub_user_description', true );
+	if ( empty( $description ) ) {
+		$description = get_user_meta( $user_id, 'description', true );
+	}
+	return $description;
+}
+
+/**
+ * Check for Tombstone Objects
+ *
+ * @see https://www.w3.org/TR/activitypub/#delete-activity-outbox
+ *
+ * @param WP_Error $wp_error A WP_Error-Response of an HTTP-Request
+ *
+ * @return boolean true if HTTP-Code is 410 or 404
+ */
+function is_tombstone( $wp_error ) {
+	if ( ! is_wp_error( $wp_error ) ) {
+		return false;
+	}
+
+	if ( in_array( (int) $wp_error->get_error_code(), array( 404, 410 ), true ) ) {
+		return true;
+	}
+
+	return false;
+}

includes/model/class-follower.php

@@ -0,0 +1,317 @@
+<?php
+namespace Activitypub\Model;
+
+use Activitypub\Collection\Followers;
+
+/**
+ * ActivityPub Follower Class
+ *
+ * This Object represents a single Follower.
+ * There is no direct reference to a WordPress User here.
+ *
+ * @author Matthias Pfefferle
+ *
+ * @see https://www.w3.org/TR/activitypub/#follow-activity-inbox
+ */
+class Follower {
+	/**
+	 * The Object ID
+	 *
+	 * @var int
+	 */
+	private $id;
+
+	/**
+	 * The Actor-URL of the Follower
+	 *
+	 * @var string
+	 */
+	private $actor;
+
+	/**
+	 * The Object slug
+	 *
+	 * This is a requirement of the Term-Meta but will not
+	 * be actively used in the ActivityPub context.
+	 *
+	 * @var string
+	 */
+	private $slug;
+
+	/**
+	 * The Object Name
+	 *
+	 * This is the same as the Actor-URL
+	 *
+	 * @var string
+	 */
+	private $name;
+
+	/**
+	 * The Username
+	 *
+	 * @var string
+	 */
+	private $username;
+
+	/**
+	 * The Avatar URL
+	 *
+	 * @var string
+	 */
+	private $avatar;
+
+	/**
+	 * The URL to the Followers Inbox
+	 *
+	 * @var string
+	 */
+	private $inbox;
+
+	/**
+	 * The URL to the Servers Shared-Inbox
+	 *
+	 * If the Server does not support Shared-Inboxes,
+	 * the Inbox will be stored.
+	 *
+	 * @var string
+	 */
+	private $shared_inbox;
+
+	/**
+	 * The date, the Follower was updated
+	 *
+	 * @var string untixtimestamp
+	 */
+	private $updated_at;
+
+	/**
+	 * The complete Remote-Profile of the Follower
+	 *
+	 * @var array
+	 */
+	private $meta;
+
+	/**
+	 * The latest received error.
+	 *
+	 * This will only temporary and will saved to $this->errors
+	 *
+	 * @var string
+	 */
+	private $error;
+
+	/**
+	 * A list of errors
+	 *
+	 * @var array
+	 */
+	private $errors;
+
+	/**
+	 * Maps the meta fields to the local db fields
+	 *
+	 * @var array
+	 */
+	private $map_meta = array(
+		'name'              => 'name',
+		'preferredUsername' => 'username',
+		'inbox'             => 'inbox',
+	);
+
+	/**
+	 * Constructor
+	 *
+	 * @param WP_Post $post
+	 */
+	public function __construct( $actor ) {
+		$this->actor = $actor;
+
+		$term = get_term_by( 'name', $actor, Followers::TAXONOMY );
+
+		if ( $term ) {
+			$this->id = $term->term_id;
+			$this->slug = $term->slug;
+			$this->meta = json_decode( $term->meta );
+		}
+	}
+
+	/**
+	 * Magic function to implement getter and setter
+	 *
+	 * @param string $method
+	 * @param string $params
+	 *
+	 * @return void
+	 */
+	public function __call( $method, $params ) {
+		$var = \strtolower( \substr( $method, 4 ) );
+
+		if ( \strncasecmp( $method, 'get', 3 ) === 0 ) {
+			if ( empty( $this->$var ) ) {
+				return $this->get( $var );
+			}
+			return $this->$var;
+		}
+
+		if ( \strncasecmp( $method, 'set', 3 ) === 0 ) {
+			$this->$var = $params[0];
+		}
+	}
+
+	public function from_meta( $meta ) {
+		$this->meta = $meta;
+
+		foreach ( $this->map_meta as $remote => $internal ) {
+			if ( ! empty( $meta[ $remote ] ) ) {
+				$this->$internal = $meta[ $remote ];
+			}
+		}
+
+		if ( ! empty( $meta['icon']['url'] ) ) {
+			$this->avatar = $meta['icon']['url'];
+		}
+
+		if ( ! empty( $meta['endpoints']['sharedInbox'] ) ) {
+			$this->shared_inbox = $meta['endpoints']['sharedInbox'];
+		} elseif ( ! empty( $meta['inbox'] ) ) {
+			$this->shared_inbox = $meta['inbox'];
+		}
+
+		$this->updated_at = \strtotime( 'now' );
+	}
+
+	public function get( $attribute ) {
+		if ( $this->$attribute ) {
+			return $this->$attribute;
+		}
+
+		$attribute = get_term_meta( $this->id, $attribute, true );
+		if ( $attribute ) {
+			$this->$attribute = $attribute;
+			return $attribute;
+		}
+
+		$attribute = $this->get_meta_by( $attribute );
+		if ( $attribute ) {
+			$this->$attribute = $attribute;
+			return $attribute;
+		}
+
+		return null;
+	}
+
+	public function get_errors() {
+		if ( $this->errors ) {
+			return $this->errors;
+		}
+
+		$this->errors = get_term_meta( $this->id, 'errors' );
+		return $this->errors;
+	}
+
+	public function count_errors() {
+		$errors = $this->get_errors();
+
+		if ( is_array( $errors ) && ! empty( $errors ) ) {
+			return count( $errors );
+		}
+
+		return 0;
+	}
+
+	public function get_latest_error_message() {
+		$errors = $this->get_errors();
+
+		if ( is_array( $errors ) && ! empty( $errors ) ) {
+			return reset( $errors );
+		}
+
+		return '';
+	}
+
+	public function get_meta_by( $attribute ) {
+		$meta = $this->get_meta();
+
+		// try mapped data (see $this->map_meta)
+		foreach ( $this->map_meta as $remote => $local ) {
+			if ( $attribute === $local && isset( $meta[ $remote ] ) ) {
+				return $meta[ $remote ];
+			}
+		}
+
+		// try ActivityPub attribtes
+		if ( ! empty( $this->map_meta[ $attribute ] ) ) {
+			return $this->map_meta[ $attribute ];
+		}
+
+		return null;
+	}
+
+	public function get_meta() {
+		if ( $this->meta ) {
+			return $this->meta;
+		}
+
+		return null;
+	}
+
+	public function update() {
+		$term = wp_update_term(
+			$this->id,
+			Followers::TAXONOMY,
+			array(
+				'description' => wp_json_encode( $this->get_meta( true ) ),
+			)
+		);
+
+		$this->updated_at = \strtotime( 'now' );
+		$this->update_term_meta();
+	}
+
+	public function save() {
+		$term = wp_insert_term(
+			$this->actor,
+			Followers::TAXONOMY,
+			array(
+				'slug'        => sanitize_title( $this->get_actor() ),
+				'description' => wp_json_encode( $this->get_meta() ),
+			)
+		);
+
+		$this->id = $term['term_id'];
+
+		$this->update_term_meta();
+	}
+
+	public function upsert() {
+		if ( $this->id ) {
+			$this->update();
+		} else {
+			$this->save();
+		}
+	}
+
+	protected function update_term_meta() {
+		$attributes = array( 'inbox', 'shared_inbox', 'avatar', 'updated_at', 'name', 'username' );
+
+		foreach ( $attributes as $attribute ) {
+			if ( $this->get( $attribute ) ) {
+				update_term_meta( $this->id, $attribute, $this->get( $attribute ) );
+			}
+		}
+
+		if ( $this->error ) {
+			if ( is_string( $this->error ) ) {
+				$error = $this->error;
+			} elseif ( is_wp_error( $this->error ) ) {
+				$error = $this->error->get_error_message();
+			} else {
+				$error = __( 'Unknown Error or misconfigured Error-Message', 'activitypub' );
+			}
+
+			add_term_meta( $this->id, 'errors', $error );
+		}
+
+	}
+}

includes/model/class-post.php

@@ -28,6 +28,13 @@ class Post {
 	 */
 	private $id;
 
+	/**
+	 * The Object URL.
+	 *
+	 * @var string
+	 */
+	private $url;
+
 	/**
 	 * The Object Summary.
 	 *
@@ -179,6 +186,7 @@ class Post {
 
 		$array = array(
 			'id' => $this->get_id(),
+			'url' => $this->get_url(),
 			'type' => $this->get_object_type(),
 			'published' => \gmdate( 'Y-m-d\TH:i:s\Z', \strtotime( $post->post_date_gmt ) ),
 			'attributedTo' => \get_author_posts_url( $post->post_author ),
@@ -207,13 +215,13 @@ class Post {
 	}
 
 	/**
-	 * Returns the ID of an Activity Object
+	 * Returns the URL of an Activity Object
 	 *
 	 * @return string
 	 */
-	public function get_id() {
+	public function get_url() {
-		if ( $this->id ) {
+		if ( $this->url ) {
-			return $this->id;
+			return $this->url;
 		}
 
 		$post = $this->post;
@@ -224,11 +232,26 @@ class Post {
 			$permalink = \get_permalink( $post );
 		}
 
-		$this->id = $permalink;
+		$this->url = $permalink;
 
 		return $permalink;
 	}
 
+	/**
+	 * Returns the ID of an Activity Object
+	 *
+	 * @return string
+	 */
+	public function get_id() {
+		if ( $this->id ) {
+			return $this->id;
+		}
+
+		$this->id = $this->get_url();
+
+		return $this->id;
+	}
+
 	/**
 	 * Returns a list of Image Attachments
 	 *
@@ -282,16 +305,31 @@ class Post {
 
 		// get URLs for each image
 		foreach ( $image_ids as $id ) {
-			$alt = \get_post_meta( $id, '_wp_attachment_image_alt', true );
+			$image_size = 'full';
-			$thumbnail = \wp_get_attachment_image_src( $id, 'full' );
+
-			$mimetype = \get_post_mime_type( $id );
+			/**
+			 * 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;
 				}
@@ -304,6 +342,36 @@ class Post {
 		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.
+	 */
+	public 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_pre', $id, $image_size );
+
+		return $thumbnail;
+	}
+
 	/**
 	 * Returns a list of Tags, used in the Post
 	 *
@@ -463,48 +531,6 @@ class Post {
 			return "[ap_content]\n\n[ap_hashtags]\n\n[ap_permalink type=\"html\"]";
 		}
 
-		// Upgrade from old template codes to shortcodes.
-		$content = self::upgrade_post_content_template();
-
-		return $content;
-	}
-
-	/**
-	 * Updates the custom template to use shortcodes instead of the deprecated templates.
-	 *
-	 * @return string the updated template content
-	 */
-	public static function upgrade_post_content_template() {
-		// Get the custom template.
-		$old_content = \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
-
-		// If the old content exists but is a blank string, we're going to need a flag to updated it even
-		// after setting it to the default contents.
-		$need_update = false;
-
-		// If the old contents is blank, use the defaults.
-		if ( '' === $old_content ) {
-			$old_content = ACTIVITYPUB_CUSTOM_POST_CONTENT;
-			$need_update = true;
-		}
-
-		// Set the new content to be the old content.
-		$content = $old_content;
-
-		// Convert old templates to shortcodes.
-		$content = \str_replace( '%title%', '[ap_title]', $content );
-		$content = \str_replace( '%excerpt%', '[ap_excerpt]', $content );
-		$content = \str_replace( '%content%', '[ap_content]', $content );
-		$content = \str_replace( '%permalink%', '[ap_permalink type="html"]', $content );
-		$content = \str_replace( '%shortlink%', '[ap_shortlink type="html"]', $content );
-		$content = \str_replace( '%hashtags%', '[ap_hashtags]', $content );
-		$content = \str_replace( '%tags%', '[ap_hashtags]', $content );
-
-		// Store the new template if required.
-		if ( $content !== $old_content || $need_update ) {
-			\update_option( 'activitypub_custom_post_content', $content );
-		}
-
 		return $content;
 	}
 }

includes/peer/class-followers.php

@@ -9,76 +9,26 @@ namespace Activitypub\Peer;
 class Followers {
 
 	public static function get_followers( $author_id ) {
-		$followers = \get_user_option( 'activitypub_followers', $author_id );
+		_deprecated_function( __METHOD__, '1.0.0', '\Activitypub\Collection\Followers::get_followers' );
 
-		if ( ! $followers ) {
+		return \Activitypub\Collection\Followers::get_followers( $author_id );
-			return array();
-		}
-
-		foreach ( $followers as $key => $follower ) {
-			if (
-				\is_array( $follower ) &&
-				isset( $follower['type'] ) &&
-				'Person' === $follower['type'] &&
-				isset( $follower['id'] ) &&
-				false !== \filter_var( $follower['id'], \FILTER_VALIDATE_URL )
-			) {
-				$followers[ $key ] = $follower['id'];
-			}
-		}
-
-		return $followers;
 	}
 
 	public static function count_followers( $author_id ) {
-		$followers = self::get_followers( $author_id );
+		_deprecated_function( __METHOD__, '1.0.0', '\Activitypub\Collection\Followers::count_followers' );
 
-		return \count( $followers );
+		return \Activitypub\Collection\Followers::count_followers( $author_id );
 	}
 
 	public static function add_follower( $actor, $author_id ) {
-		$followers = \get_user_option( 'activitypub_followers', $author_id );
+		_deprecated_function( __METHOD__, '1.0.0', '\Activitypub\Collection\Followers::add_follower' );
 
-		if ( ! \is_string( $actor ) ) {
+		return \Activitypub\Collection\Followers::add_follower( $author_id, $actor );
-			if (
-				\is_array( $actor ) &&
-				isset( $actor['type'] ) &&
-				'Person' === $actor['type'] &&
-				isset( $actor['id'] ) &&
-				false !== \filter_var( $actor['id'], \FILTER_VALIDATE_URL )
-			) {
-				$actor = $actor['id'];
-			}
-
-			return new \WP_Error(
-				'invalid_actor_object',
-				\__( 'Unknown Actor schema', 'activitypub' ),
-				array(
-					'status' => 404,
-				)
-			);
-		}
-
-		if ( ! \is_array( $followers ) ) {
-			$followers = array( $actor );
-		} else {
-			$followers[] = $actor;
-		}
-
-		$followers = \array_unique( $followers );
-
-		\update_user_meta( $author_id, 'activitypub_followers', $followers );
 	}
 
 	public static function remove_follower( $actor, $author_id ) {
-		$followers = \get_user_option( 'activitypub_followers', $author_id );
+		_deprecated_function( __METHOD__, '1.0.0', '\Activitypub\Collection\Followers::remove_follower' );
 
-		foreach ( $followers as $key => $value ) {
+		return \Activitypub\Collection\Followers::remove_follower( $author_id, $actor );
-			if ( $value === $actor ) {
-				unset( $followers[ $key ] );
-			}
-		}
-
-		\update_user_meta( $author_id, 'activitypub_followers', $followers );
 	}
 }

includes/rest/class-followers.php

@@ -1,6 +1,12 @@
 <?php
 namespace Activitypub\Rest;
 
+use WP_Error;
+use stdClass;
+use WP_REST_Server;
+use WP_REST_Response;
+use Activitypub\Collection\Followers as FollowerCollection;
+
 /**
  * ActivityPub Followers REST-Class
  *
@@ -25,7 +31,7 @@ class Followers {
 			'/users/(?P<user_id>\d+)/followers',
 			array(
 				array(
-					'methods'             => \WP_REST_Server::READABLE,
+					'methods'             => WP_REST_Server::READABLE,
 					'callback'            => array( self::class, 'get' ),
 					'args'                => self::request_parameters(),
 					'permission_callback' => '__return_true',
@@ -46,7 +52,7 @@ class Followers {
 		$user    = \get_user_by( 'ID', $user_id );
 
 		if ( ! $user ) {
-			return new \WP_Error(
+			return new WP_Error(
 				'rest_invalid_param',
 				\__( 'User not found', 'activitypub' ),
 				array(
@@ -63,7 +69,7 @@ class Followers {
 		 */
 		\do_action( 'activitypub_outbox_pre' );
 
-		$json = new \stdClass();
+		$json = new stdClass();
 
 		$json->{'@context'} = \Activitypub\get_context();
 
@@ -73,14 +79,11 @@ class Followers {
 		$json->type = 'OrderedCollectionPage';
 
 		$json->partOf = \get_rest_url( null, "/activitypub/1.0/users/$user_id/followers" ); // phpcs:ignore
-		$json->totalItems = \Activitypub\count_followers( $user_id ); // phpcs:ignore
-		$json->orderedItems = \Activitypub\Peer\Followers::get_followers( $user_id ); // phpcs:ignore
-
 		$json->first = $json->partOf; // phpcs:ignore
+		$json->totalItems = FollowerCollection::count_followers( $user_id ); // phpcs:ignore
+		$json->orderedItems = FollowerCollection::get_followers( $user_id, ARRAY_N ); // phpcs:ignore
 
-		$json->first = \get_rest_url( null, "/activitypub/1.0/users/$user_id/followers" );
+		$response = new WP_REST_Response( $json, 200 );
-
-		$response = new \WP_REST_Response( $json, 200 );
 		$response->header( 'Content-Type', 'application/activity+json' );
 
 		return $response;

includes/rest/class-inbox.php

@@ -19,10 +19,8 @@ class Inbox {
 	 */
 	public static function init() {
 		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
-		\add_action( 'activitypub_inbox_follow', array( self::class, 'handle_follow' ), 10, 2 );
+		\add_filter( 'rest_pre_serve_request', array( self::class, 'serve_request' ), 11, 4 );
-		\add_action( 'activitypub_inbox_undo', array( self::class, 'handle_unfollow' ), 10, 2 );
+
-		//\add_action( 'activitypub_inbox_like', array( self::class, 'handle_reaction' ), 10, 2 );
-		//\add_action( 'activitypub_inbox_announce', array( self::class, 'handle_reaction' ), 10, 2 );
 		\add_action( 'activitypub_inbox_create', array( self::class, 'handle_create' ), 10, 2 );
 	}
 
@@ -319,43 +317,6 @@ class Inbox {
 		return $params;
 	}
 
-	/**
-	 * Handles "Follow" requests
-	 *
-	 * @param  array $object  The activity-object
-	 * @param  int   $user_id The id of the local blog-user
-	 */
-	public static function handle_follow( $object, $user_id ) {
-		// save follower
-		Followers::add_follower( $object['actor'], $user_id );
-
-		// get inbox
-		$inbox = \Activitypub\get_inbox_by_actor( $object['actor'] );
-
-		// send "Accept" activity
-		$activity = new Activity( 'Accept' );
-		$activity->set_object( $object );
-		$activity->set_actor( \get_author_posts_url( $user_id ) );
-		$activity->set_to( $object['actor'] );
-		$activity->set_id( \get_author_posts_url( $user_id ) . '#follow-' . \preg_replace( '~^https?://~', '', $object['actor'] ) );
-
-		$activity = $activity->to_simple_json();
-
-		$response = \Activitypub\safe_remote_post( $inbox, $activity, $user_id );
-	}
-
-	/**
-	 * Handles "Unfollow" requests
-	 *
-	 * @param  array $object  The activity-object
-	 * @param  int   $user_id The id of the local blog-user
-	 */
-	public static function handle_unfollow( $object, $user_id ) {
-		if ( isset( $object['object'] ) && isset( $object['object']['type'] ) && 'Follow' === $object['object']['type'] ) {
-			Followers::remove_follower( $object['actor'], $user_id );
-		}
-	}
-
 	/**
 	 * Handles "Reaction" requests
 	 *

includes/rest/class-nodeinfo.php

@@ -75,13 +75,24 @@ class Nodeinfo {
 			'version' => \get_bloginfo( 'version' ),
 		);
 
-		$users = \count_users();
+		$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_users'],
+				'total' => $users,
 			),
 			'localPosts' => (int) $posts->publish,
 			'localComments' => (int) $comments->approved,

includes/rest/class-webfinger.php

@@ -54,15 +54,16 @@ class Webfinger {
 		$resource = \str_replace( 'acct:', '', $resource );
 
 		$resource_identifier = \substr( $resource, 0, \strrpos( $resource, '@' ) );
-		$resource_host = \substr( \strrchr( $resource, '@' ), 1 );
+		$resource_host = \str_replace( 'www.', '', \substr( \strrchr( $resource, '@' ), 1 ) );
+		$blog_host = \str_replace( 'www.', '', \wp_parse_url( \home_url( '/' ), \PHP_URL_HOST ) );
 
-		if ( \wp_parse_url( \home_url( '/' ), \PHP_URL_HOST ) !== $resource_host ) {
+		if ( $blog_host !== $resource_host ) {
 			return new WP_Error( 'activitypub_wrong_host', \__( 'Resource host does not match blog host', 'activitypub' ), array( 'status' => 404 ) );
 		}
 
 		$user = \get_user_by( 'login', \esc_sql( $resource_identifier ) );
 
-		if ( ! $user || ! user_can( $user, 'publish_posts' ) ) {
+		if ( ! $user || ! \user_can( $user, 'publish_posts' ) ) {
 			return new WP_Error( 'activitypub_user_not_found', \__( 'User not found', 'activitypub' ), array( 'status' => 404 ) );
 		}
 

includes/table/class-followers.php

@@ -0,0 +1,117 @@
+<?php
+namespace Activitypub\Table;
+
+use WP_List_Table;
+use Activitypub\Collection\Followers as FollowerCollection;
+
+if ( ! \class_exists( '\WP_List_Table' ) ) {
+		require_once ABSPATH . 'wp-admin/includes/class-wp-list-table.php';
+}
+
+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' ),
+			'identifier'   => \__( 'Identifier', 'activitypub' ),
+			'errors'       => \__( 'Errors', 'activitypub' ),
+			'latest-error' => \__( 'Latest Error Message', 'activitypub' ),
+		);
+	}
+
+	public function get_sortable_columns() {
+		return array();
+	}
+
+	public function prepare_items() {
+		$columns = $this->get_columns();
+		$hidden  = array();
+
+		$this->process_action();
+		$this->_column_headers = array( $columns, $hidden, $this->get_sortable_columns() );
+
+		$page_num = $this->get_pagenum();
+		$per_page = 20;
+
+		$follower = FollowerCollection::get_followers( \get_current_user_id(), ACTIVITYPUB_OBJECT, $per_page, ( $page_num - 1 ) * $per_page );
+		$counter  = FollowerCollection::count_followers( \get_current_user_id() );
+
+		$this->items = array();
+		$this->set_pagination_args(
+			array(
+				'total_items' => $counter,
+				'total_pages' => round( $counter / $per_page ),
+				'per_page'    => $per_page,
+			)
+		);
+
+		foreach ( $follower as $follower ) {
+			$item = array(
+				'avatar'       => esc_attr( $follower->get_avatar() ),
+				'name'         => esc_attr( $follower->get_name() ),
+				'username'     => esc_attr( $follower->get_username() ),
+				'identifier'   => esc_attr( $follower->get_actor() ),
+				'errors'       => $follower->count_errors(),
+				'latest-error' => $follower->get_latest_error_message(),
+			);
+
+			$this->items[] = $item;
+		}
+	}
+
+	public function get_bulk_actions() {
+		return array(
+			'delete' => __( 'Delete', 'activitypub' ),
+		);
+	}
+
+	public function column_default( $item, $column_name ) {
+		if ( ! array_key_exists( $column_name, $item ) ) {
+			return __( 'None', 'activitypub' );
+		}
+		return $item[ $column_name ];
+	}
+
+	public function column_avatar( $item ) {
+		return sprintf(
+			'<img src="%s" width="25px;" />',
+			$item['avatar']
+		);
+	}
+
+	public function column_identifier( $item ) {
+		return sprintf(
+			'<a href="%s" target="_blank">%s</a>',
+			$item['identifier'],
+			$item['identifier']
+		);
+	}
+
+	public function column_cb( $item ) {
+		return sprintf( '<input type="checkbox" name="followers[]" value="%s" />', esc_attr( $item['identifier'] ) );
+	}
+
+	public function process_action() {
+		if ( ! isset( $_REQUEST['followers'] ) || ! isset( $_REQUEST['_apnonce'] ) ) {
+			return false;
+		}
+
+		if ( ! wp_verify_nonce( $_REQUEST['_apnonce'], 'activitypub-followers-list' ) ) {
+			return false;
+		}
+
+		if ( ! current_user_can( 'edit_user', \get_current_user_id() ) ) {
+			return false;
+		}
+
+		$followers = $_REQUEST['followers']; // phpcs:ignore
+
+		switch ( $this->current_action() ) {
+			case 'delete':
+				FollowerCollection::remove_follower( \get_current_user_id(), $followers );
+				break;
+		}
+	}
+}

includes/table/followers-list.php

@@ -1,36 +0,0 @@
-<?php
-namespace Activitypub\Table;
-
-if ( ! \class_exists( '\WP_List_Table' ) ) {
-		require_once ABSPATH . 'wp-admin/includes/class-wp-list-table.php';
-}
-
-class Followers_List extends \WP_List_Table {
-	public function get_columns() {
-		return array(
-			'identifier' => \__( 'Identifier', 'activitypub' ),
-		);
-	}
-
-	public function get_sortable_columns() {
-		return array();
-	}
-
-	public function prepare_items() {
-		$columns = $this->get_columns();
-		$hidden  = array();
-
-		$this->process_action();
-		$this->_column_headers = array( $columns, $hidden, $this->get_sortable_columns() );
-
-		$this->items = array();
-
-		foreach ( \Activitypub\Peer\Followers::get_followers( \get_current_user_id() ) as $follower ) {
-			$this->items[]['identifier'] = \esc_attr( $follower );
-		}
-	}
-
-	public function column_default( $item, $column_name ) {
-		return $item[ $column_name ];
-	}
-}

readme.txt

@@ -2,7 +2,7 @@
 Contributors: pfefferle, mediaformat, akirk, automattic
 Tags: OStatus, fediverse, activitypub, activitystream
 Requires at least: 4.7
-Tested up to: 6.1
+Tested up to: 6.2
 Stable tag: 0.17.0
 Requires PHP: 5.6
 License: MIT
@@ -111,7 +111,12 @@ Where 'blog' is the path to the subdirectory at which your blog resides.
 
 == Changelog ==
 
-Project maintained on GitHub at [pfefferle/wordpress-activitypub](https://github.com/pfefferle/wordpress-activitypub).
+Project maintained on GitHub at [automattic/wordpress-activitypub](https://github.com/automattic/wordpress-activitypub).
+
+= Next =
+
+* Compatibility: add hooks to allow modifying images returned in ActivityPub requests.
+* Compatibility: indicate that the plugin is compatible and has been tested with the latest version of WordPress, 6.2.
 
 = 0.17.0 =
 

templates/author-json.php

@@ -8,7 +8,7 @@ $json->id = \get_author_posts_url( $author_id );
 $json->type = 'Person';
 $json->name = \get_the_author_meta( 'display_name', $author_id );
 $json->summary = \html_entity_decode(
-	\get_the_author_meta( 'description', $author_id ),
+	\Activitypub\get_author_description( $author_id ),
 	\ENT_QUOTES,
 	'UTF-8'
 );

templates/followers-list.php

@@ -1,16 +1,17 @@
 <div class="wrap">
-	<h1><?php \esc_html_e( 'Followers (Fediverse)', 'activitypub' ); ?></h1>
+	<h1><?php \esc_html_e( 'Followers', 'activitypub' ); ?></h1>
 
 	<?php // translators: ?>
-	<p><?php \printf( \esc_html__( 'You currently have %s followers.', 'activitypub' ), \esc_attr( \Activitypub\Peer\Followers::count_followers( \get_current_user_id() ) ) ); ?></p>
+	<p><?php \printf( \esc_html__( 'You currently have %s followers.', 'activitypub' ), \esc_attr( \Activitypub\Collection\Followers::count_followers( \get_current_user_id() ) ) ); ?></p>
 
-	<?php $token_table = new \Activitypub\Table\Followers_List(); ?>
+	<?php $token_table = new \Activitypub\Table\Followers(); ?>
 
 	<form method="get">
-		<input type="hidden" name="page" value="indieauth_user_token" />
+		<input type="hidden" name="page" value="activitypub-followers-list" />
 		<?php
 		$token_table->prepare_items();
 		$token_table->display();
 		?>
+		<?php wp_nonce_field( 'activitypub-followers-list', '_apnonce' ); ?>
 		</form>
 </div>

templates/user-settings.php

@@ -0,0 +1,29 @@
+<h2 id="activitypub"><?php \esc_html_e( 'ActivityPub', 'activitypub' ); ?></h2>
+
+<table class="form-table">
+	<tbody>
+		<tr>
+			<th scope="row">
+				<label><?php \esc_html_e( 'Profile identifier', 'activitypub' ); ?></label>
+			</th>
+			<td>
+				<p>
+					<code><?php echo \esc_html( \Activitypub\get_webfinger_resource( \get_current_user_id() ) ); ?></code> or
+					<code><?php echo \esc_url( \get_author_posts_url( \get_current_user_id() ) ); ?></code>
+				</p>
+				<?php // translators: the webfinger resource ?>
+				<p class="description"><?php \printf( \esc_html__( 'Try to follow "@%s" by searching for it on Mastodon,Friendica & Co.', 'activitypub' ), \esc_html( \Activitypub\get_webfinger_resource( \get_current_user_id() ) ) ); ?></p>
+			</td>
+		</tr>
+		<tr class="activitypub-user-description-wrap">
+			<th>
+				<label for="activitypub-user-description"><?php \esc_html_e( 'Biography', 'activitypub' ); ?></label>
+			</th>
+			<td>
+				<textarea name="activitypub-user-description" id="activitypub-user-description" rows="5" cols="30" placeholder="<?php echo \esc_html( get_user_meta( \get_current_user_id(), 'description', true ) ); ?>"><?php echo \esc_html( $args['description'] ); ?></textarea>
+				<p class="description"><?php \esc_html_e( 'If you wish to use different biographical info for the fediverse, enter your alternate bio here.', 'activitypub' ); ?></p>
+			</td>
+			<?php wp_nonce_field( 'activitypub-user-description', '_apnonce' ); ?>
+		</tr>
+	</tbody>
+</table>

tests/test-class-activitypub-activity-dispatcher.php

@@ -5,17 +5,22 @@ class Test_Activitypub_Activity_Dispatcher extends ActivityPub_TestCase_Cache_HT
 			'url' => 'https://example.org/users/username',
 			'inbox' => 'https://example.org/users/username/inbox',
 			'name'  => 'username',
+			'prefferedUsername'  => 'username',
 		),
 		'jon@example.com' => array(
 			'url' => 'https://example.com/author/jon',
 			'inbox' => 'https://example.com/author/jon/inbox',
 			'name'  => 'jon',
+			'prefferedUsername'  => 'jon',
 		),
 	);
 
 	public function test_dispatch_activity() {
 		$followers = array( 'https://example.com/author/jon', 'https://example.org/users/username' );
-		\update_user_meta( 1, 'activitypub_followers', $followers );
+
+		foreach ( $followers as $follower ) {
+			\Activitypub\Collection\Followers::add_follower( 1, $follower );
+		}
 
 		$post = \wp_insert_post(
 			array(

tests/test-class-activitypub-mention.php

@@ -31,6 +31,7 @@ ENDPRE;
 			array( 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@<span>pfefferle</span>@notiz.blog</a> test', 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@<span>pfefferle</span>@notiz.blog</a> test' ),
 			array( 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@pfefferle@notiz.blog</a> test', 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@pfefferle@notiz.blog</a> test' ),
 			array( 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/@pfefferle/">@pfefferle@notiz.blog</a> test', 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/@pfefferle/">@pfefferle@notiz.blog</a> test' ),
+			array( 'hallo <img src="abc" alt="https://notiz.blog/@pfefferle/" title="@pfefferle@notiz.blog"/> test', 'hallo <img src="abc" alt="https://notiz.blog/@pfefferle/" title="@pfefferle@notiz.blog"/> test' ),
 			array( $code, $code ),
 			array( $pre, $pre ),
 		);

tests/test-class-db-activitypub-followers.php

@@ -1,15 +1,60 @@
 <?php
 class Test_Db_Activitypub_Followers extends WP_UnitTestCase {
-	public function test_get_followers() {
+	public static $users = array(
-		$followers = array( 'https://example.com/author/jon', 'https://example.org/author/doe' );
+		'username@example.org' => array(
-		$followers[] = array(
+			'url' => 'https://example.org/users/username',
-			'type' => 'Person',
+			'inbox' => 'https://example.org/users/username/inbox',
-			'id' => 'http://sally.example.org',
+			'name'  => 'username',
-			'name' => 'Sally Smith',
+			'prefferedUsername'  => 'username',
+		),
+		'jon@example.com' => array(
+			'url' => 'https://example.com/author/jon',
+			'inbox' => 'https://example.com/author/jon/inbox',
+			'name'  => 'jon',
+			'prefferedUsername'  => 'jon',
+		),
+		'doe@example.org' => array(
+			'url' => 'https://example.org/author/doe',
+			'inbox' => 'https://example.org/author/doe/inbox',
+			'name'  => 'doe',
+			'prefferedUsername'  => 'doe',
+		),
+		'sally@example.org' => array(
+			'url' => 'http://sally.example.org',
+			'inbox' => 'http://sally.example.org/inbox',
+			'name'  => 'jon',
+			'prefferedUsername'  => 'jon',
+		),
+		'12345@example.com' => array(
+			'url' => 'https://12345.example.com',
+			'inbox' => 'https://12345.example.com/inbox',
+			'name'  => '12345',
+			'prefferedUsername'  => '12345',
+		),
 	);
-		\update_user_meta( 1, 'activitypub_followers', $followers );
 
-		$db_followers = \Activitypub\Peer\Followers::get_followers( 1 );
+	public function set_up() {
+		parent::set_up();
+		add_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_metadata_by_actor' ), 10, 2 );
+		_delete_all_posts();
+	}
+
+	public function tear_down() {
+		remove_filter( 'pre_get_remote_metadata_by_actor', array( get_called_class(), 'pre_get_remote_metadata_by_actor' ) );
+		parent::tear_down();
+	}
+
+	public function test_get_followers() {
+		$followers = array( 'https://example.com/author/jon', 'https://example.org/author/doe', 'http://sally.example.org' );
+
+		$pre_http_request = new MockAction();
+		add_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10, 3 );
+
+		foreach ( $followers as $follower ) {
+			$response = \Activitypub\Collection\Followers::add_follower( 1, $follower );
+		}
+
+		$db_followers = \Activitypub\Collection\Followers::get_followers( 1 );
 
 		$this->assertEquals( 3, \count( $db_followers ) );
 
@@ -17,11 +62,72 @@ class Test_Db_Activitypub_Followers extends WP_UnitTestCase {
 	}
 
 	public function test_add_follower() {
-		$follower = 'https://example.com/author/' . \time();
+		$pre_http_request = new MockAction();
-		\Activitypub\Peer\Followers::add_follower( $follower, 1 );
+		add_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10, 3 );
 
-		$db_followers = \Activitypub\Peer\Followers::get_followers( 1 );
+		$follower = 'https://12345.example.com';
+		\Activitypub\Collection\Followers::add_follower( 1, $follower );
+
+		$db_followers = \Activitypub\Collection\Followers::get_followers( 1 );
 
 		$this->assertContains( $follower, $db_followers );
 	}
+
+	public function test_get_follower() {
+		$followers = array( 'https://example.com/author/jon' );
+
+		$pre_http_request = new MockAction();
+		add_filter( 'pre_http_request', array( $pre_http_request, 'filter' ), 10, 3 );
+
+		foreach ( $followers as $follower ) {
+			\Activitypub\Collection\Followers::add_follower( 1, $follower );
+		}
+
+		$follower = \Activitypub\Collection\Followers::get_follower( 1, 'https://example.com/author/jon' );
+		$this->assertEquals( 'https://example.com/author/jon', $follower->get_actor() );
+
+		$follower = \Activitypub\Collection\Followers::get_follower( 1, 'http://sally.example.org' );
+		$this->assertNull( $follower );
+	}
+
+	public static function http_request_host_is_external( $in, $host ) {
+		if ( in_array( $host, array( 'example.com', 'example.org' ), true ) ) {
+			return true;
+		}
+		return $in;
+	}
+	public static function http_request_args( $args, $url ) {
+		if ( in_array( wp_parse_url( $url, PHP_URL_HOST ), array( 'example.com', 'example.org' ), true ) ) {
+			$args['reject_unsafe_urls'] = false;
+		}
+		return $args;
+	}
+
+	public static function pre_http_request( $preempt, $request, $url ) {
+		return array(
+			'headers'  => array(
+				'content-type' => 'text/json',
+			),
+			'body'     => '',
+			'response' => array(
+				'code' => 202,
+			),
+		);
+	}
+
+	public static function http_response( $response, $args, $url ) {
+		return $response;
+	}
+
+	public static function pre_get_remote_metadata_by_actor( $pre, $actor ) {
+		if ( isset( self::$users[ $actor ] ) ) {
+			return self::$users[ $actor ];
+		}
+		foreach ( self::$users as $username => $data ) {
+			if ( $data['url'] === $actor ) {
+				return $data;
+			}
+		}
+		return $pre;
+	}
 }