Profiles: Update followers when profile fields change (#542)

* Profiles: update followers when profile fields change

* use static

* only try to merge mention inboxes when valid

* cleanups

* add hook to wp_update_user

* update readme

---------

Co-authored-by: Matthias Pfefferle <pfefferle@users.noreply.github.com>

README.md

@@ -114,6 +114,7 @@ Project maintained on GitHub at [automattic/wordpress-activitypub](https://githu
 * Added: CSS class for ActivityPub comments to allow custom designs
 * Added: FEP-2677: Identifying the Application Actor
 * Added: Basic Comment Federation
+* Added: Profile Update Activities
 * Improved: WebFinger endpoints
 
 ### 1.3.0 ###

includes/class-activity-dispatcher.php

@@ -28,6 +28,7 @@ class Activity_Dispatcher {
 	public static function init() {
 		\add_action( 'activitypub_send_activity', array( self::class, 'send_activity' ), 10, 2 );
 		\add_action( 'activitypub_send_activity', array( self::class, 'send_activity_or_announce' ), 10, 2 );
+		\add_action( 'activitypub_send_update_profile_activity', array( self::class, 'send_profile_update' ), 10, 1 );
 	}
 
 	/**
@@ -76,17 +77,7 @@ class Activity_Dispatcher {
 
 		$activity = $transformer->to_activity( $type );
 
-		$follower_inboxes  = Followers::get_inboxes( $user_id );
+		self::send_activity_to_inboxes( $activity, $user_id );
-		$mentioned_inboxes = Mention::get_inboxes( $activity->get_cc() );
-
-		$inboxes = array_merge( $follower_inboxes, $mentioned_inboxes );
-		$inboxes = array_unique( $inboxes );
-
-		$json = $activity->to_json();
-
-		foreach ( $inboxes as $inbox ) {
-			safe_remote_post( $inbox, $json, $user_id );
-		}
 	}
 
 	/**
@@ -112,12 +103,60 @@ class Activity_Dispatcher {
 		$user_id  = $transformer->get_wp_user_id();
 		$activity = $transformer->to_activity( 'Announce' );
 
+		self::send_activity_to_inboxes( $activity, $user_id );
+	}
+
+	/**
+	 * Send a "Update" Activity when a user updates their profile.
+	 *
+	 * @param int $user_id The user ID to send an update for.
+	 *
+	 * @return void
+	 */
+	public static function send_profile_update( $user_id ) {
+		$user = Users::get_by_various( $user_id );
+
+		// bail if that's not a good user
+		if ( is_wp_error( $user ) ) {
+			return;
+		}
+
+		// build the update
+		$activity = new Activity();
+		$activity->set_id( $user->get_url() . '#update' );
+		$activity->set_type( 'Update' );
+		$activity->set_actor( $user->get_url() );
+		$activity->set_object( $user->get_url() );
+		$activity->set_to( 'https://www.w3.org/ns/activitystreams#Public' );
+
+		// send the update
+		self::send_activity_to_inboxes( $activity, $user_id );
+	}
+
+	/**
+	 * Send an Activity to all followers and mentioned users.
+	 *
+	 * @param Activity $activity The ActivityPub Activity.
+	 * @param int      $user_id  The user ID.
+	 *
+	 * @return void
+	 */
+	private static function send_activity_to_inboxes( $activity, $user_id ) {
 		$follower_inboxes = Followers::get_inboxes( $user_id );
-		$mentioned_inboxes = Mention::get_inboxes( $activity->get_cc() );
+
+		$mentioned_inboxes = array();
+		$cc = $activity->get_cc();
+		if ( $cc ) {
+			$mentioned_inboxes = Mention::get_inboxes( $cc );
+		}
 
 		$inboxes = array_merge( $follower_inboxes, $mentioned_inboxes );
 		$inboxes = array_unique( $inboxes );
 
+		if ( empty( $inboxes ) ) {
+			return;
+		}
+
 		$json = $activity->to_json();
 
 		foreach ( $inboxes as $inbox ) {

includes/class-scheduler.php

@@ -6,12 +6,15 @@ use Activitypub\Collection\Users;
 use Activitypub\Collection\Followers;
 use Activitypub\Transformer\Post;
 
+use function Activitypub\is_user_type_disabled;
+
 /**
  * ActivityPub Scheduler Class
  *
  * @author Matthias Pfefferle
  */
 class Scheduler {
+
 	/**
 	 * Initialize the class, registering WordPress hooks
 	 */
@@ -58,6 +61,22 @@ class Scheduler {
 
 		// Migration
 		\add_action( 'admin_init', array( self::class, 'schedule_migration' ) );
+
+		// profile updates for blog options
+		if ( ! is_user_type_disabled( 'blog' ) ) {
+			\add_action( 'update_option_site_icon', array( self::class, 'blog_user_update' ) );
+			\add_action( 'update_option_blogdescription', array( self::class, 'blog_user_update' ) );
+			\add_action( 'update_option_blogname', array( self::class, 'blog_user_update' ) );
+			\add_filter( 'pre_set_theme_mod_custom_logo', array( self::class, 'blog_user_update' ) );
+			\add_filter( 'pre_set_theme_mod_header_image', array( self::class, 'blog_user_update' ) );
+		}
+
+		// profile updates for user options
+		if ( ! is_user_type_disabled( 'user' ) ) {
+			\add_action( 'wp_update_user', array( self::class, 'user_update' ) );
+			\add_action( 'updated_user_meta', array( self::class, 'user_meta_update' ), 10, 3 );
+			// @todo figure out a feasible way of updating the header image since it's not unique to any user.
+		}
 	}
 
 	/**
@@ -255,4 +274,68 @@ class Scheduler {
 			\wp_schedule_single_event( \time(), 'activitypub_schedule_migration' );
 		}
 	}
+
+	/**
+	 * Send a profile update when relevant user meta is updated.
+	 *
+	 * @param  int    $meta_id Meta ID being updated.
+	 * @param  int    $user_id User ID being updated.
+	 * @param  string $meta_key Meta key being updated.
+	 *
+	 * @return void
+	 */
+	public static function user_meta_update( $meta_id, $user_id, $meta_key ) {
+		// don't bother if the user can't publish
+		if ( ! \user_can( $user_id, 'publish_posts' ) ) {
+			return;
+		}
+		// the user meta fields that affect a profile.
+		$fields = array(
+			'activitypub_user_description',
+			'description',
+			'user_url',
+			'display_name',
+		);
+		if ( in_array( $meta_key, $fields, true ) ) {
+			self::schedule_profile_update( $user_id );
+		}
+	}
+
+	/**
+	 * Send a profile update when a user is updated.
+	 *
+	 * @param  int $user_id User ID being updated.
+	 *
+	 * @return void
+	 */
+	public static function user_update( $user_id ) {
+		// don't bother if the user can't publish
+		if ( ! \user_can( $user_id, 'publish_posts' ) ) {
+			return;
+		}
+
+		self::schedule_profile_update( $user_id );
+	}
+
+	/**
+	 * Theme mods only have a dynamic filter so we fudge it like this.
+	 * @param  mixed $value
+	 * @return mixed
+	 */
+	public static function blog_user_update( $value = null ) {
+		self::schedule_profile_update( 0 );
+		return $value;
+	}
+
+	/**
+	 * Send a profile update to all followers. Gets hooked into all relevant options/meta etc.
+	 * @param int $user_id  The user ID to update (Could be 0 for Blog-User).
+	 */
+	public static function schedule_profile_update( $user_id ) {
+		\wp_schedule_single_event(
+			\time(),
+			'activitypub_send_update_profile_activity',
+			array( $user_id )
+		);
+	}
 }

readme.txt

@@ -114,6 +114,7 @@ Project maintained on GitHub at [automattic/wordpress-activitypub](https://githu
 * Added: CSS class for ActivityPub comments to allow custom designs
 * Added: FEP-2677: Identifying the Application Actor
 * Added: Basic Comment Federation
+* Added: Profile Update Activities
 * Improved: WebFinger endpoints
 
 = 1.3.0 =