wordpress-activitypub/includes/class-activity-dispatcher.php

154 lines
4.1 KiB
PHP

<?php
namespace Activitypub;
use WP_Post;
use Activitypub\Activity\Activity;
use Activitypub\Collection\Users;
use Activitypub\Collection\Followers;
use Activitypub\Transformer\Post;
use function Activitypub\is_single_user;
use function Activitypub\is_user_disabled;
use function Activitypub\safe_remote_post;
/**
* ActivityPub Activity_Dispatcher Class
*
* @author Matthias Pfefferle
*
* @see https://www.w3.org/TR/activitypub/
*/
class Activity_Dispatcher {
/**
* Initialize the class, registering WordPress hooks.
*/
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 );
}
/**
* Send Activities to followers and mentioned users or `Announce` (boost) a blog post.
*
* @param WP_Post $wp_post The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_activity_or_announce( WP_Post $wp_post, $type ) {
// check if a migration is needed before sending new posts
Migration::maybe_migrate();
if ( is_user_type_disabled( 'blog' ) ) {
return;
}
$wp_post->post_author = Users::BLOG_USER_ID;
if ( is_single_user() ) {
self::send_activity( $wp_post, $type );
} else {
self::send_announce( $wp_post, $type );
}
}
/**
* Send Activities to followers and mentioned users.
*
* @param WP_Post $wp_post The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_activity( WP_Post $wp_post, $type ) {
if ( is_user_disabled( $wp_post->post_author ) ) {
return;
}
$object = Post::transform( $wp_post )->to_object();
$activity = new Activity();
$activity->set_type( $type );
$activity->set_object( $object );
self::send_activity_to_inboxes( $activity, $wp_post->post_author );
}
/**
* Send Announces to followers and mentioned users.
*
* @param WP_Post $wp_post The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_announce( WP_Post $wp_post, $type ) {
if ( ! in_array( $type, array( 'Create', 'Update' ), true ) ) {
return;
}
if ( is_user_disabled( Users::BLOG_USER_ID ) ) {
return;
}
$object = Post::transform( $wp_post )->to_object();
$activity = new Activity();
$activity->set_type( 'Announce' );
// to pre-fill attributes like "published" and "id"
$activity->set_object( $object );
// send only the id
$activity->set_object( $object->get_id() );
self::send_activity_to_inboxes( $activity, $wp_post->post_author );
}
/**
* Send a "Update" Activity when a user updates their profile.
*
* @param int $user_id The user ID to send an update for.
*
*/
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() );
$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 );
}
}
}