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

184 lines
4.9 KiB
PHP

<?php
namespace Activitypub;
use WP_Post;
use WP_Comment;
use Activitypub\Activity\Activity;
use Activitypub\Collection\Users;
use Activitypub\Collection\Followers;
use Activitypub\Transformer\Factory;
use Activitypub\Transformer\Post;
use Activitypub\Transformer\Comment;
use function Activitypub\get_rest_url_by_path;
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 mixed $wp_object The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_activity_or_announce( $wp_object, $type ) {
// check if a migration is needed before sending new post
Migration::maybe_migrate();
self::send_announce( $wp_object, $type, Users::APPLICATION_USER_ID );
if ( is_user_type_disabled( 'blog' ) ) {
return;
}
if ( is_single_user() ) {
self::send_activity( $wp_object, $type, Users::BLOG_USER_ID );
} else {
self::send_announce( $wp_object, $type, Users::BLOG_USER_ID );
}
}
/**
* Send Activities to followers and mentioned users.
*
* @param mixed $wp_object The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_activity( $wp_object, $type, $user_id = null ) {
$transformer = Factory::get_transformer( $wp_object );
if ( null !== $user_id ) {
$transformer->change_wp_user_id( $user_id );
}
$user_id = $transformer->get_wp_user_id();
if ( is_user_disabled( $user_id ) ) {
return;
}
$activity = $transformer->to_activity( $type );
self::send_activity_to_inboxes( $activity, $user_id );
}
/**
* Send Announces to followers and mentioned users.
*
* @param mixed $wp_object The ActivityPub Post.
* @param string $type The Activity-Type.
*
* @return void
*/
public static function send_announce( $wp_object, $type, $user_id = null ) {
if ( ! in_array( $type, array( 'Create', 'Update' ), true ) ) {
return;
}
$transformer = Factory::get_transformer( $wp_object );
if ( null !== $user_id && Users::APPLICATION_USER_ID !== $user_id ) {
$transformer->change_wp_user_id( $user_id );
}
if ( ! $user_id ) {
$user_id = $transformer->get_wp_user_id();
}
if ( is_user_disabled( $user_id ) ) {
return;
}
$activity = $transformer->to_activity( 'Announce' );
// TODO: properly fix this for the instance-to-instance federation with Mobilizon.
// Error:
// Failed to map identity from signature (payload actor mismatch)
// key_id=http://wp.lan/wp-json/activitypub/1.0/application, actor=http://wp.lan/@blog
// Of course, the announce must be sent as the Application actor because he also signed it!
if ( Users::APPLICATION_USER_ID === $user_id ) {
$activity->set_actor( get_rest_url_by_path( 'application' ) );
}
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 = 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 ) {
safe_remote_post( $inbox, $json, $user_id );
}
}
}